Background technology
In oilfield process, every annual meeting produces a large amount of ground sludges, operation greasy filth, the large oily sludge such as tank bed mud and water treatment spoil disposal; Can in drilling process in the exploration of oil or gas well, the Advanced Drilling Technology of increasing oil recovery oil base or synthesis base, produces a large amount of oil base well drilling detritus simultaneously; Due to discharge in violation of regulations or accident leakage, every annual meeting produces the soil that a large amount of oil pollution exceeds standard; In addition, the industries such as oil refining, petrochemical industry and iron and steel, also can produce a large amount of oily sludges.Above-mentioned oil-containing solids waste has been put into National Hazard waste register, except land occupation, pollutent also by diffusive migration in soil and groundwater, can enter ecotope, cause serious environmental hazard, therefore must realize harmless treatment and disposal.Innoxious and the recycling treatment of oil-containing solids waste and disposal are the social responsibility that must fulfil of enterprise and legal obligation.Because oil-containing solids waste is containing some oil, therefore, while innoxious, refiltered oil is again the ideal and the environmental protection treatment mode that realize recycling, in addition, in " oil and gas exploitation industry pollution prevention technique policy ", clear stipulaties " should reclaim ground crude oil, and crude Treatment, oily substance in the greasy filth (sand) that wastewater treatment produces etc., oily sludge resource utilization rate should reach more than 90%, residual solid refuse should according to " National Hazard refuse register " and the identification of Hazardous wastes judging standard, according to recognition result recycling or harmlessness disposing ".Therefore, be badly in need of developing safe and reliable technology and device, the oil field oil-containing solid waste that pile up like a mountain is thoroughly realized innoxious and recycling treatment.Current domestic referential innoxious standard is " Sludge in Oilfields comprehensive utilization Environmental capacity standard " DB23/T 1413-2010, and the residue TPH content wherein after predetermined processing is less than 2%, and other indexs are by the appraisal and evaluation test of regulation.
Because oil-containing solids waste kind is many, complicated component, simultaneously containing a large amount of foreign material, the difficulty therefore processed is very large, invests relative with working cost very high.Except pre-treatment minimizing and foreign material sorting process, the treatment technology of recent year experimental study and engineering practice has: solid-liquid leaching method (comprising washing and leaching agent leaching), microbial method (comprising compost and farming etc.), solidification fill up, recharge stratum and heat treating process (comprising burning, superheated vapour desorption, Thermal desorption and thermal desorption etc.).Due to i.e. and physical strength good sand comparatively large containing particle in oil-containing solid waste, again containing the suitable foundry loam or the chemical sludge that there is no concrete form, and there is the surface of oleophylic, therefore solid-liquid leaching method can by sand process to innoxious, but oil, foundry loam is difficult to layering with water three and is separated, exist in actual applications process not thoroughly, separating unit is difficult to steady running or the problem of the technology such as leaching agent turnover rate is too large and economic two aspects.Microbial method needs pollutant dilution and is distributed to a certain degree, need to take a large amount of soils, the innoxious cycle is very long, and part pollutent such as the organism such as polycyclic aromatic hydrocarbons and naphthenic acid may also almost cannot be degraded, and therefore may face larger environmental risk.Solidification is filled up and is embedded among solid by solidifying agent by oil, then safety is filled up, but finally can not exempt the pollutent possibility that leaches of slowly-releasing and corresponding Environmental liability again, there is risk, the curing agent content of the moisture higher needs of oil-containing is larger in addition, and the amount of waste is actual have been increased considerably.Recharge stratum and need applicable ground sheaf space, and guarantee can not polluted underground water, there is risk in finite capacity.Burning can make organism thoroughly innoxious, but does not have refiltered oil, there are certain requirements the form of oleaginousness, water content and solid simultaneously, otherwise the efficiency that remarkably influenced is burned, meanwhile, the intractability of incineration tail gas is comparatively large, causes air-polluting very risky.Superheated vapour desorption method needs solid waste to be sprayed rear fully contact with superheated vapour and realizes oily desorption, and the processing power that under current technical qualification, equipment can realize is very little, and there is the technical problem of restriction operation steady in a long-term.Thermal desorption technology is ripe at Refining Chemical Industry, at relatively high temperatures, it is the mixed gas (resolution gas) of the various small molecules hydro carbons of gaseous state, hydrogen and carbon monoxide etc. under organism can be made fully to be cracked into normal temperature, can realize innoxious, but the purification of resolution gas more than needed and recycling existing problems, this technology requires very high to analyzing device in addition, and security risk is comparatively large, running maintenance and management difficulty higher.Thermal desorption or thermal desorption technology are at moderate temperatures, make oil from solid, evaporate desorption to be recycled, realize resource utilization and innoxious, thermal desorption technology is feasible and reliable in principle simultaneously, but needs to carry out for technique and device the process that innovative ability is suitable for oil-containing solid waste.
Domestic patent CN101972773A " unit of forced ventilation-helical stir thermal desorption renovation of organic pollution soil ", CN102069088A " unit of repairing organic contaminated soil by soil ventilation-vertical desorption furnace " and CN102284473A " unit is repaired in drum-type soil thermal desorption " and CN203508590U " rotary type Soil Thermal desorb prosthetic device " discloses a kind of thermal desorption processes technology and device of organic polluted soil respectively, but because the proterties of oil-containing solid waste is significantly different from soil, there is inflammable and explosive oily vapour volatilization in heating simultaneously, process oil-containing solid waste will cause unit to block and the blast of oily vapour, there is no the function of refiltered oil in addition, the tail gas of discharge can cause topsoil, therefore these three kinds of Technologies and implement device are not suitable for processing oil-containing solids, at home also not used for case and the research of oil-containing fixed-end forces.Domestic patent CN103406346A " a kind of method of normal temperature desorb associating chemical oxidation renovation of organic pollution soil and processing unit " discloses a kind of scheme process organic polluted soil turning over throwing spontaneous evaporation desorb and add chemical oxidation, the method is applicable to the removal of volatile and oxidizable organic pollutant, and polluted air, be more not suitable for the removal of distilling the higher and not oxidizable oil of point.Domestic patent CN103447292A " a kind of in-situ thermal desorption treatment technology of contaminated soil and unit " discloses a kind of in-situ thermal desorption treatment technology, and this technology is not suitable for that porosity is very low equally, the moisture higher and oil-containing solid waste that oily distillation point is higher of oil-containing.
Summary of the invention
Based on the problems referred to above, the invention provides a kind of oil-containing solid waste indirect heating thermal desorption treatment process and device, to overcome the shortcoming of existing THE METHOD OF THERMAL DESORPTION.
In the present invention, oil-containing solid waste indirect heating thermal desorption treatment unit includes the automatic control unit of unified cooperation control, by the feed pretreatment units that oil-containing solid waste material load mode is sequentially communicated with, charging metering and protected location, indirect heating and thermal desorption unit, desorption steam isolation of purified unit is connected at the stripping gas oil gas vent place of described indirect heating and thermal desorption unit, dregs post-processing unit is connected in the discharge outlet of described indirect heating and thermal desorption unit, described indirect heating and thermal desorption unit are made up of heating cavity and thermal desorption cavity, wherein the heated portion of thermal desorption cavity is placed among described heating cavity, internal space and the internal space of described heating cavity of described thermal desorption cavity are that two independences are separated and mutual disconnected cavity.
Described thermal desorption cavity includes cylindrical shell cylindrically, airtight by tightness system at the two ends of described cylindrical shell, opening for feed and discharge port is respectively equipped with at the two ends of described cylindrical shell, to arch upward oil gas collection chamber toward epirelief in the middle part of described cylindrical shell, the wall in described oil gas collection chamber is provided with oil gas vent, simultaneously in the outside wall surface in described cylindrical shell and oil gas collection chamber, is provided with multiple thermopair that can carry out thermometric to described cylindrical shell; In described thermal desorption cavity, be provided with a screw propulsion agitator, the tightness system that the main shaft of this screw propulsion agitator extends described barrel end connects with variable-frequency motor.
Described main shaft is provided with the stepped start-stop system impeller that helical pitch progressively diminishes along described main shaft, described stepped start-stop system impeller is welded with and turns over mud plate, on described main shaft, be welded with gravity cleaning chain simultaneously.
Described opening for feed and discharge outlet are equipped with gas lock, and this gas lock connects nitrogen unit, carries out nitrogen-sealed to described opening for feed and discharge port.
Described heating cavity is a steel outer chamber, is provided with external fuel burner, non-condensable gas nozzles outside described steel outer chamber, is provided with baffle plate, inwall has been sticked insulating fire brick in described steel outer chamber, is provided with chimney on described steel outer chamber simultaneously.
Described desorption steam isolation of purified cellular installation is at the oil gas vent place of described indirect heating and thermal desorption unit, by the vacuum jet pump be sequentially communicated with by pipeline, impeller pump, triphase separator, cyclone separator, moisture trap and line strainer composition, described vacuum jet pump is communicated with through the oil gas vent of pipeline with thermal desorption cavity, simultaneously with described impeller pump, triphase separator is communicated with, the stripping gas outlet of described triphase separator is communicated with described cyclone separator through pipeline, the stripping gas outlet of described cyclone separator is communicated with described moisture trap through pipeline, the stripping gas outlet of described moisture trap is communicated with described line strainer through pipeline, the stripping gas outlet of described line strainer directly exports the gas that can recycle, described cyclone separator, moisture trap are communicated with described triphase separator with the isolate outlet of line strainer, described impeller pump is communicated with described triphase separator.
Described desorption steam isolation of purified cellular installation is at the oil gas vent place of described indirect heating and thermal desorption unit, be made up of the spray cooler connected successively by pipeline, the first coalescing separator, regeneration blower fan, the second coalescing separator, moisture trap and line strainer, described spray cooler connects the thermal desorption gas that described thermal desorption cavity exports.
Described spray cooler includes tank body, multiple nozzle assembly, coarse separation district, spark arrester, check valve, the top of described tank body connects described spark arrester and check valve successively, described multiple nozzle assembly is arranged on the sidewall of described tank body evenly distributedly, and stretch into the inside of described tank body, described coarse separation district is loaded in the described tank interior position be positioned at above nozzle assembly installation site, the bottom of described tank body is provided with inlet mouth and water outlet, and the junction of described tank body top and described spark arrester is provided with air outlet.
Oil-containing solid waste indirect heating thermal desorption treatment process in the present invention, includes following steps:
1) predrainage process is done by feed pretreatment units liquid towards greasy filth, complete that foreign material sort in preprocessing field again together with moisture lower oil-containing solid waste, homogeneous and the pre-treatment job such as to break up, stand-by in Material Staging Area, the material of Material Staging Area controls moisturely to be less than 30% usually, oil-containing is not limit, and obtains the material of the relative homogeneous of applicable indirect thermal desorb process;
2) measured and protected location by charging, pretreated material measured, sieves, Magneto separate and conveying, be delivered to indirect heating and thermal desorption unit after controlling with quantitative adjusting and constant;
3) by indirect heating and thermal desorption unit, being separated of profit and solid phase is realized to the material that charging metering and protected location are carried, in this indirect heating and thermal desorption unit, oil-containing solid waste material is advanced along axis by the horizontal duplex with the non-equidistance breaing up mechanism, progressively be warming up to the thermal desorption temperature of setting, under anoxic conditions, complete intensification successively, water evaporation, the thermal desorption process of most of oil desorption and the cracking of small part gum asphalt, realize the innoxious of solid, the desorb residence time of material is controlled by the rotating speed setting spiral, the residence time controls at 20 ~ 30min, the material completing thermal desorption is called dregs, its TPH content controls in the level being less than 1%, dregs post-processing unit is entered from desorb chamber discharge port, the vapour phase of separating sucking-off enters desorption steam isolation of purified unit by desorption steam outlet,
4) enter the heating cavity burning of indirect heating and thermal desorption unit from the non-condensable gas of desorption steam isolation of purified cell processing, thermal source as a supplement, heating cavity combustion tail gas is by smoke stack emission air.
Described step 4) in desorption steam isolation of purified unit by negative pressure ventilation equipment desorption steam drawn in the desorb cavity of indirect heating and thermal desorption unit and enters desorption steam isolation of purified unit, the water that desorption steam isolation of purified unit is discharged absorbs the heat of desorption steam and temperature raises, carry water and oil that desorption steam condensation goes out simultaneously, and a small amount of dirt washed out, enter circulating water treatment and receive after oily unit processes, be circulated back to again desorption steam isolation of purified unit as water coolant, before stripping gas enters desorption steam isolation of purified unit, adopt petroleum hydrocarbon steam filter plant, dust in vapour phase is filtered.
Device and method in the present invention is in conjunction with oil-containing solid waste feature, based on indirect thermal desorb or thermal desorption principle, the dregs TPH content after processing is made to be less than 1%, and do not produce the waste water of secondary pollution, waste gas and waste residue, realize the innoxious of oil-containing solid waste, reclaim the oil of in greasy filth more than 75% simultaneously, and non-condensable gas has been used as auxiliary fuel, achieve resource utilization.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment in the present invention is elaborated.
As shown in Figure 1, in the present invention, oil-containing solid waste indirect heating thermal desorption treatment unit includes feed pretreatment units 1, charging metering and protected location 2, indirect heating and thermal desorption unit 3, desorption steam isolation of purified unit 5, circulating water treatment and receives oily unit 6, dregs post-processing unit 4, sewage purification unit 7, nitrogen protection unit 8 and automatic control unit 9.
Feed pretreatment units 1 is provided with the charging stockyard that the classification of oil-containing solid waste accepts and deposits, the obvious foreign material rubbish such as packing bag are removed in charging stockyard, then turnover throwing machine tool is adopted to complete the blending homogeneous of all kinds of greasy filth and break up operation, on the mechanical rotary drum of turnover throwing machine tool, be provided with one group of plate washer, in turnover throwing machine tool traveling process, soft foreign material can be collected on baffle plate, and the rigidity impurity of bulk turns over to be thrown both sides and artificially collect.Obtain moisturely being not more than 30% after feed pretreatment units completes, the oil-containing solid waste that diameter is not more than 40mm is transferred to Material Staging Area.
Charging metering and protected location 2, as shown in Figure 2, include the equipment such as storage hopper 20, outfeed belt 21 and material title 22, reciprocating sieve 23, magnetic separating apparatus 26, charging belt 25 and the local housing that connects with automatic control unit 9.Outfeed belt 21 and material title 22 are located at immediately below storage hopper 20, cloth adjustable plate 24 is provided with in the discharging direction of storage hopper 20, discharging is made to be evenly distributed on outfeed belt 21 by the thickness of specifying, the motor of outfeed belt 21 is the motor of variable ratio frequency changer speed governing, weight sensor is provided with in material title 22, being positioned at below outfeed belt 21, for monitoring the weight of material of unit length on outfeed belt 21, being provided with the gait of march of tachogenerator monitoring belt in addition.Reciprocating sieve 23 is provided with the screen cloth of 40mm, is driven by vibration motor, and reciprocating sieve 23 is provided with screen overflow relief outlet and screen underflow discharge port 27, and screen underflow discharge port 27 is positioned at directly over charging belt 25 feed end.Charging belt 25 angle of inclination is less than 15 °, is driven by motor, is provided with 2 ~ 4 groups of dismountable ferromagnetism permanent magnets or electro-magnet above charging belt 25.Local housing is the equipment distribution in charging metering and protected location 2; and show running status and parameter by PLC; and the quantitative adjusting of discharging and constant control, housing is also provided with communication interface and automatic control unit communication, can realize the Long-distance Control of charging metering and protected location 2.
Indirect heating and thermal desorption unit 3, as shown in Figure 3, be made up of heating cavity 45 and thermal desorption cavity, wherein the heated portion of thermal desorption cavity is placed among heating cavity 45, and internal space and the internal space of heating cavity 45 of thermal desorption cavity are that two independences are separated and mutual disconnected cavity.
Thermal desorption cavity includes cylindrical shell 30 cylindrically, the two ends of this cylindrical shell 30 are airtight by tightness system 31, opening for feed 32 and discharge port 33 is respectively equipped with at the two ends of cylindrical shell 30, to arch upward oil gas collection chamber 35 toward epirelief in the middle part of cylindrical shell 30, the wall in oil gas collection chamber 35 is provided with oil gas vent 36 (also claiming stripping gas outlet), oil gas collection chamber 35 is arc-shaped structure, be welded to connect with oil gas collection chamber 35 after the upper shed of oil gas collection chamber 3, simultaneously in the outside wall surface in cylindrical shell 30 and oil gas collection chamber 35, be provided with multiple thermopair 37 that can carry out thermometric to cylindrical shell 30.It is inner that the major part of cylindrical shell 30 except discharge port 33 is all placed in heating cavity 45, heating cavity 45 is a steel outer chamber, 4 ~ 6 remote controlled burners 42 are provided with outside steel outer chamber, non-condensable gas nozzles, in steel outer chamber, be provided with baffle plate, inwall has been sticked insulating fire brick, on described steel outer chamber, be provided with chimney 47 simultaneously.Adopt Sweet natural gas or fuel Heating, after heating cavity 45 inside is heated, indirect heating is carried out to cylindrical shell 30, be provided with fire-resistant heat insulating material at the internal surface of cylindrical shell 30.
A spiral propeller is provided with in cylindrical shell 30, this spiral propeller includes the used main shaft 34 wearing cylindrical shell 30, main shaft 34 is provided with the stepped start-stop system impeller 38 that helical pitch progressively diminishes along main shaft 34, one end of main shaft 34 is extended outside heating cavity 45 and cylindrical shell 30 through closed unit 31, connects after shaft coupling 39, transmission rig 40 with variable-frequency motor 41.Main shaft 34 is processed by weldless steel tube, and material is heat-resisting carbon steel, leaves certain interval between the inwall of stepped start-stop system impeller 38 and cylindrical shell 30, ensures unlikely clamping stagnation between stepped start-stop system impeller 38 and cylindrical shell 30.
Stepped start-stop system impeller 38 is welded with and turns over mud plate 43, ensure mud Homogeneous phase mixing, stir-fry, also ensure being separated of mud and cylindrical shell 30 inwall simultaneously; On main shaft 34, be welded with gravity cleaning chain 44 simultaneously, ensure the adhesion of mud and spiral propeller, as shown in Figure 4 and Figure 5.
Opening for feed 32 and discharge port 33 place of thermal desorption cavity are equipped with gas lock, and gas lock is driven by the motor of adjustable speed, and is provided with the interface be connected with nitrogen protection unit 8.Hopper 46 is provided with above the gas lock at opening for feed 32 place; for accepting the sludge material proposed by charging belt 25 in charging metering and protected location 2; the gas lock at discharge port 33 place is connected with dregs post-processing unit 4, and oil gas vent 36 is connected with desorption steam isolation of purified unit 5.
The gas lock of spiral propeller and opening for feed 32, discharge port 33 all can reverse rotation, to eliminate unexpected blocking and the problem such as stuck, is controlled by automatic control unit 9.
Oily sludge material and flame are separated by the indirect heating in the present invention and thermal desorption unit 3 completely; realize indirect heating; utilize the isolated protection of the gas lock of input and output material end, shaft seal and additional nitrogen gas shielded simultaneously; prevent air from entering in thermal desorption cavity; eliminate the risk of internal-combustion and blast, ensure that the security of indirect heating and thermal desorption unit 3.
At oil gas vent 36, place can connect petroleum hydrocarbon steam strainer, avoids dust to enter follow-up each unit.
Burner 42 is provided with air, fuel ratio variable valve, and desorption temperature can be controlled to be set as designated value by the PLC of automatic control unit 9, and operating temperature is 400 ~ 600 DEG C.Exhaust combustion chamber pipe is provided with adjustable valve, the heat distribution in adjustment transverse section.Combustion chamber is provided with the continuous monitor temperature signal of multiple thermopair, with the firing rate of control combustion device.
Oil-containing solid waste is advanced along axis by the horizontal duplex with the non-equidistance breaing up mechanism by indirect heating and thermal desorption unit 3, progressively be warming up to the thermal desorption temperature of setting, under anoxic conditions, complete intensification successively, water evaporation, the thermal desorption process of most of oil desorption and the cracking of small part gum asphalt, realizes the innoxious of solid, controlled the desorb residence time of material by the rotating speed setting spiral, the residence time controls at 20 ~ 30min.Flat spin is connected by being with the axle sealed with desorb cavity, avoids leaking-in air.The material completing thermal desorption is called dregs; its TPH content can be controlled in the level being less than 1%; dregs post-processing unit 4 is entered from desorb cavity discharge port 33; discharge port is provided with the gas lock of band nitrogen protection; avoid air to enter as far as possible, the vapour phase of separating sucking-off enters desorption steam isolation of purified unit 5 by oil gas vent 36.
Desorption steam isolation of purified unit 5 is arranged on the top of indirect heating and thermal desorption unit 3, extracts desorption gas in negative pressure ventilation mode out in the thermal desorption cavity of indirect heating and thermal desorption unit 3.Desorption steam isolation of purified unit 5 is a condensing equipment, and this condensing equipment can adopt indirect cooling apparatus or spraying cooling equipment two kinds.Wherein:
As shown in Figure 6, indirect cooling apparatus includes the vacuum jet pump 50 be sequentially communicated with by pipeline, impeller pump 51, triphase separator 52, cyclone separator 53, moisture trap 54 and line strainer 55, vacuum jet pump 50 is communicated with through the oil gas vent 36 of pipeline with indirect heating and thermal desorption unit 3, simultaneously with impeller pump 51, triphase separator 52 is communicated with, the stripping gas outlet of triphase separator 52 is communicated with cyclone separator 53 through pipeline, the stripping gas outlet of cyclone separator 53 is communicated with moisture trap 54 through pipeline, the stripping gas outlet of moisture trap 54 is communicated with line strainer 55 through pipeline, the stripping gas outlet of line strainer 55 directly exports the gas that can recycle.
Cyclone separator 53, moisture trap 54 are communicated with triphase separator 52 with the isolate outlet of line strainer 55; Impeller pump 51 is communicated with triphase separator 52.Vacuum jet pump 50 is pumping equipment with the combination of impeller pump 51, also be time condensation equipment, namely under the effect of impeller pump 51, clear water is extracted in triphase separator 52, additional specific flow velocity and flow after impeller pump 51, enter vacuum jet pump 50, when current flow fast through vacuum jet pump 50 inside, drive vacuum, suck the stripping gas produced by indirect heating and thermal desorption unit 3, mix fully in vacuum jet pump 50, mixed air-water mixture enters triphase separator 52 under gravity.In the gas-water separation district of triphase separator 52 inside, in mixture, heavy solid ash component and mink cell focus are deposited to bottom under gravity, receive mud groove through taper and collect discharge, lightweight oily hydro carbons in mixing zone floats to liquid level top, recycling is collected through adjustable weir plate, volatile hydrocarbon gas in mixture, gas-phase space is formed at separator top, venting port through top is discharged, enter cyclone separator 53 again, moisture trap 54 and line strainer 55, remove ash residual in gas phase component, water vapour and other impurity, the gas processed is air and volatile hydrocarbon mixture, enter circulating water treatment through pipeline and receive oily unit 6 or get back in the heating cavity 45 of indirect heating and thermal desorption unit 3, carry out process furnace combustion-supporting to realize making full use of.
Desorption steam isolation of purified unit 5 also can adopt spraying cooling equipment, as shown in Figure 7, spraying cooling equipment includes spray cooler 60, first coalescing separator 61, regeneration blower fan 62, second coalescing separator 63, moisture trap 54 and the line strainer 55 that are communicated with successively by pipeline.
As shown in Figure 8, spray cooler 60 comprises the cylindrical tank body 64 be made up of carbon steel, the top seal of tank body 64 is provided with injector lid 72, and be sealedly connected with spark arrester 67 and check valve 68 successively through injector lid 72, equally distributed on the sidewall of tank body 64 multiple nozzle assembly 65 is installed, the inside of tank body 64 is stretched in one end of nozzle assembly 65, be positioned in tank body 64 inside above nozzle assembly 65 installation site and load coarse separation district 66, cone bucket is had at the bottom welding of tank body 64, and the lowermost end of cone bucket is provided with water outlet 71, and near the position of cone bucket, multiple inlet mouth 69 is set at tank body 64 along tank body for 64 1 weeks, the junction of tank body 64 top and spark arrester 67 is provided with air outlet 70.Air outlet 70 connects the first coalescing separator 61, regeneration blower fan 62, second coalescing separator 63, moisture trap 54 and line strainer 55 successively by pipeline.
Under adsorption through regenerating blower fan 62, desorb cavity enters spray cooler 60 from the desorption gas that oil gas vent exports, via the vapor-liquid separation of spray cooler 60, make isolated liquid phase enter circulating water treatment and receive oily unit 6, non-condensable gas is then connected on the combustion chamber non-condensable gas burning nozzles of indirect heating and thermal desorption unit 3 by pipeline.
The pressure-fired of 20 ~ 30KPa can be formed while negative pressure ventilation, the non-condensable gas after process is sent into the burning nozzles of heating cavity 45.
Dregs post-processing unit 4 comprises outfeed belt conveyor, humidifying apparatus and dust suppression equipment, the opening for feed of dregs post-processing unit 4 outfeed belt conveyor is connected with the discharge port 33 of indirect heating and thermal desorption unit 3, the discharge port of dregs post-processing unit 4 connects the entrance of dust suppression equipment, dust suppression equipment discharge port is arranged on above discharging stockyard, and the humidification water inlet interface on dust suppression equipment is connected by pipeline with humidifying apparatus.Dust suppression equipment adopts
The sour jujube shape spiral of 300rpm realizes water smoke and fully contacts with the quick of dust, in the space of about 1m, complete dust suppression.Humidifying apparatus comprises water tank and coupled impeller pump, and outlet of centrifugal pump is connected with dust suppression equipment.The all adjustable rotating speed of motor of transfer roller and dust suppression equipment, usual control unit regulates.
Circulating water treatment and receive oily unit 6 and receive water outlet in desorption steam isolation of purified unit 5, the natural subsidence completing the solid three-phase mixture of profit in circulating water treatment and receiving in oily unit 6 is separated, the oil slick on top is discharged to low level recovery fuel tank by scraping oil pipe, then is passed to joint station oil product unit by outside recovery oil pump.Solid precipitation, at bottom mud drainage slot, is regularly discharged.Water overflows to cyclic water tank, and enter air cooler through recycle pump pressurization, temperature is reduced to 40 ~ 50 DEG C from 50 ~ 60 DEG C, the sewage after cooling, and a part is back to use desorption steam isolation of purified unit 5, and redundance enters sewage purification unit 7.Circulating water treatment and receive oily unit 6 for closed cells, run under the pressure of 20 ~ 40KPa, inside is provided with liquid level, temperature and pressure sensor, and fan for air cooler is designed to multiple stage series connection, according to air cooler out temperature, can automatically control unlatching quantity and the time of air cooler.
Sewage purification unit 7 comprises preprocessing part and advanced treatment part, the coagulation floatation equipment that preprocessing part passes through removes oil, after oil removing, water part enters the humidification water water tank of dregs post-processing unit 4 by lift pump, unnecessary water penetration depth treating part, advanced treatment part adopts oxidation and an adsorption device, by row outer after water treatment to the water quality standard of outer draining.
Nitrogen protection unit 8 adopts swing adsorption nitrogen producing apparatus to obtain nitrogen; constant voltage supply purity 99.9% nitrogen; nitrogen storage is at nitrogen storage tank, and nitrogen storage tank outlet is connected to the position such as the opening for feed 32 of indirect heating and thermal desorption unit 3, the gas lock of discharge port 33 as inert protective gas by pipeline.
Automatic control unit carries out centralized displaying, warning and control to the online various flows of above-mentioned all unit, pressure, temperature, liquid level, rotating machinery rotating speed, machine operation frequency, current of electric and voltage and Self controlling valve state etc., and be provided with automatic control program complete operation, be provided with chain sequence of control and ensure unit operating safety, be provided with data gathering memory function to consult historical data and generating report forms.Namely realized the control of whole device by DCS or PLC, computer screen shows the flow process of each unit and reference mark real-time status and monitoring point real time data, display screen can realize the setting of operation control to unit and automatic control program parameter.Unit is provided with warning and safe and continuous sequence of control ensures that unit safety is controlled.
In sum, in the present invention, oil-containing solid waste indirect heating thermal desorption treatment unit is by feed pretreatment units, obtains the material of the relative homogeneous of applicable indirect thermal desorb process; By charging metering and protected location constant feed amount, ensure the continuous and steady operation of whole system; By indirect heating and thermal desorption unit, realize being separated of profit and solid phase, realize the innoxious of solid phase; By desorption steam isolation of purified unit and circulating water treatment and receive oily unit, realize heat balance, the resource utilization of oil reclaims and the utilization of non-condensable gas; Dregs post-processing unit realizes the cooling of solid phase and avoids airborne dust; Sewage purification unit guarantees that residue sewage is free from environmental pollution; Owing to adopting clean fuel and indirect heating pattern, chimney tail gas meets atmospheric emission standard.
Solid phase total petroleum hydrocarbons content after process of the present invention can reach less than 0.3%, and under guaranteeing various operating mode, stability contorting is below 1%, and dregs mixes in the ratio of 5 ~ 25% quality that adobe does not affect vitrified brick, realizes thorough harmless treatment and safe disposal; The oil reclaiming in greasy filth more than 75% is recycled, and non-condensable gas directly flashes back utilization on the spot, realizes resource utilization; Residue sewage realizes purifying treatment, utilization or properly disposes, and tail gas is up to standard, does not cause secondary pollution to environment, can be widely used in the process of the industry such as oil field, petrochemical industry oily sludge and oil base well drilling detritus and organic polluted soil.
Be more than preferred embodiments of the present invention, not any pro forma restriction done to the present invention.Every according to technology of the present invention refer to above example is done any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.