CN108034466A - A kind of selexol process technique suitable for floating platform on sea - Google Patents

Abstract

The present invention relates to gas chemical industry field, particularly a kind of selexol process technique suitable for floating platform on sea, including reactor, reactor and centrifuge again, acid gas from battery limit (BL) is passed directly into reactor, trivalent complexing iron catalyst enters reactor again, the trivalent complexing iron catalyst of reactor bottom is entered in reactor by valve and pipe control again, chemically react, divalence Complexing Iron after reaction is after centrifugation, divalence Complexing Iron is delivered to electrochemical regenerating device by regeneration feed pump, complete regeneration, trivalent complexing iron catalyst after regeneration is back in reactor again with circulating pump.This technological process is simple, and equipment size is small, compact-sized, adapts to the limited condition limitation of sea FLNG production spaces.

Description

A kind of selexol process technique suitable for floating platform on sea

Technical field

The present invention relates to gas chemical industry field, is a kind of natural qi exhaustion suitable for floating platform on sea specificallySulphur technique.

Background technology

The H often contained in natural gas₂S、CO₂Understand heavy corrosion container, pipeline and other related facilities Deng acidic components,If environment and human body will be caused to seriously endanger less than safety standard discharge；Containing more H₂Occur during the combustion of natural gas of SPeculiar smell, the generated SO of burning₂Pollute the environment etc. compound；In catalysis is processed, the hydrocarbon compound of sulfur-bearing can make catalysisAgent is poisoned.At sea in FLNG production systems, one of most important task is exactly the removing of sour gas in natural gas pretreatment.But land natural gas acid gas removal plants, since equipment is complicated, floor space is larger, therefore is not suitable for marine FLNGNatural-gas sulphur recycling.

The content of the invention

It is an object of the present invention to overcome the above-mentioned technical problems, and to provide a kind of natural gas suitable for floating platform on seaSulfur removal technology, can be fully solved above-mentioned technical problem.

The technical solution for solving above-mentioned technical problem is as follows：

A kind of selexol process technique suitable for floating platform on sea, including reactor, again reactor and centrifuge, comeIt is passed directly into from the acid gas of battery limit (BL) in reactor, trivalent Complexing Iron catalyst storage is mended in catalyst make-up tank by catalystThe top that pump enters again reactor is filled, the interior acid gas after once oxidation of reactor is sent into acid gas conveying fan to react againThe lower part of device, then purification pneumatic transmission to the battery limit (BL), then the trivalent complexing iron catalyst of reactor bottom of reactor head pass through valveEnter with pipe control in reactor, the acid gas from battery limit (BL) and trivalent complexing iron catalyst counter current contacting in reactor, hairBiochemical reaction, the elemental sulfur of divalence Complexing Iron and generation after reaction are delivered to centrifuge by sulphur slurry feeding pump together,After centrifugation, sulphur cream is sent outside to battery limit (BL) and treats further to handle, and the divalence Complexing Iron after centrifugation is delivered to electrification by regeneration feed pumpRegenerating unit is learned, while air is blasted into electrochemical regenerating device with air-blaster, will be ferrous oxidising in catalystInto ferric iron, regeneration is completed, the trivalent complexing iron catalyst after regeneration is back in reactor again with circulating pump.

Further say, following chemical reaction occurs in the reactor：

H₂S(g)+H₂O→H₂S(L)+H₂O (1)

H₂S(L)→H⁺+HS^- (2)

HS^-+2Fe³⁺L→S+2Fe²⁺L+H⁺ (3)

O₂(g)+H₂O→O₂(L)+H₂O (4)

O₂(L)+4Fe²⁺L+2H₂O→4Fe³⁺L+4OH^- (5)。

Further say, the temperature in the reactor is 28-32 DEG C, pressure 35-50kPa, and flowing gas liquid ratio is0.56, residence time 2min.

Further say, the acid gas from battery limit (BL) contains 25%H₂S, mol%.

Further say, the H of the purified gas₂S contents<1ppmv.

Further say, anode of fuel cell and fuel battery negative pole are provided with the electrochemical regenerating device, willDivalence Complexing Iron is used as cathode reaction by the reaction of oxidation generation trivalent Complexing Iron as anode reaction, oxygen depolarization reaction,External circuit connects cell load output current, realize trivalent complexing iron catalyst in liquid phase oxidation reduction engineering it is quick againIt is raw, it is possible to increase catalyst oxidation regeneration efficiency.

The beneficial effects of the invention are as follows：

The present invention provides a kind of selexol process technique suitable for floating platform on sea, this technique can be directly by H₂SBe converted into sulphur simple substance, eliminate various oxidation links in traditional handicraft and directly obtain sulphur, the technique have infiltration rate it is fast,The characteristics of desulfuration efficiency is high.This technological process is simple, and equipment size is small, simple in structure, characteristics of compact layout, adapts to sea FLNG productionsThe limited condition limitation in space.Electrochemical regenerating device is efficient, easy to operate, reliable and stable, can greatly improve the profit of catalystWith efficiency, unit scale is reduced under the conditions of equal disposal ability.This technique sulphur recovery efficiency is high, process stabilizing, processing heel rowDeflation body reaches environmental protection standard.Electrochemical regenerating device is used for the regeneration for being complexed iron catalyst, realizes liquid phase oxidation reduction workThe rapid regeneration of iron catalyst is complexed in journey, it is possible to increase catalyst oxidation regeneration efficiency；Divalence Complexing Iron and life after reactionInto sulphur full dose centrifuge, reduce solid sulfur bring system into, be attached on electrode plate, reduce electrochemical regeneration efficiency,And cause system jams.

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Brief description of the drawings

Fig. 1 is schematic structural view of the invention；

In figure：1 is reactor, and 2 be acid gas conveying fan, and 3 be reactor again, and 4 be sulphur slurry feeding pump, and 5 be centrifugationMachine, 6 be regeneration feed pump, and 7 be electrochemical regenerating device, and 8 be air-blaster, and 9 be circulating pump, and 10 be catalyst make-up tank,11 pump for catalyst make-up.

Embodiment

Embodiment 1：

As shown in Figure 1：Acid gas from battery limit (BL) (contains 25%H₂S, mol%) enter reactor 1, it is catalyzed with trivalent Complexing IronAgent counter current contacting, occurs following chemical reaction：

H₂S(g)+H₂O→H₂S(L)+H₂O (1)

H₂S(L)→H⁺+HS^- (2)

HS^-+2Fe³⁺L→S+2Fe²⁺L+H⁺ (3)

O₂(g)+H₂O→O₂(L)+H₂O (4)

O₂(L)+4Fe²⁺L+2H₂O→4Fe³⁺L+4OH^- (5)

Temperature is 28~32 DEG C in reactor 1, and pressure is 35~50kPa, and flowing gas liquid ratio is 0.56, the residence time2min, most H in acid gas₂S is oxidized to elemental sulfur, while ferric ion is reduced into ferrous ion.ByThe acid gas acid gas conveying fan 2 of once oxidation is sent into reactor 3 again, is complexed iron catalyst counter current contacting with trivalent, furtherRemoving may remaining H in gas₂S, purification pneumatic transmission to battery limit (BL), H₂S contents<1ppmv.

When reaction starts, fresh trivalent Complexing Iron catalyst storage is in catalyst make-up tank 10, by catalyst make-upThe conveying of pump 11, is introduced into reactor 3 again, with acid gas counter current contacting, enters reactor 1 by 3 bottom of reactor again after reaction, with acidGas counter current contacting, the elemental sulfur of divalence Complexing Iron and generation after reaction are delivered to centrifuge by sulphur slurry feeding pump 4 together5, after centrifugation, sulphur cream is sent outside to battery limit (BL) and treats further to handle, and the divalence Complexing Iron after centrifugation is delivered to electricity by regeneration feed pump 6Chemical regeneration device 7, while air is blasted into electrochemical regenerating device 7 with air-blaster 8, by the ferrous iron in catalystFerric iron is oxidized to, regeneration is completed, anode of fuel cell and fuel battery negative pole is provided with electrochemical regenerating device 7, by networkClose iron catalyst regenerative response and be used as cathode reaction as anode reaction, oxygen depolarization reaction, cell load is connected in external circuitOutput current, realizes the rapid regeneration that iron catalyst is complexed in liquid phase oxidation reduction engineering, it is possible to increase catalyst aoxidizes againCome into force rate；The trivalent iron catalyst of generation is reacted on anode of fuel cell reactor 3 is returned to again by circulating pump 9 and continued and H₂SReacted, realize the circulation of sulfur recovery technology.

The above, is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is every according toAny simply modification, the equivalent variations made in technical spirit according to the present invention to above example, each fall within the guarantor of the present inventionWithin the scope of shield.

Claims (6)

1. A kind of 1. selexol process technique suitable for floating platform on sea, it is characterised in that including reactor, again reactor andCentrifuge, the acid gas from battery limit (BL) are passed directly into reactor, trivalent Complexing Iron catalyst storage in catalyst make-up tank, byCatalyst make-up pumps the top for entering again reactor, and the interior acid gas after once oxidation of reactor is sent with acid gas conveying fanEnter again the lower part of reactor, then purification pneumatic transmission to the battery limit (BL), then the trivalent of reactor bottom of reactor head is complexed iron catalystEntered by valve and pipe control in reactor, the acid gas from battery limit (BL) is complexed iron catalyst adverse current in reactor with trivalentContact, chemically reacts, and the elemental sulfur of the divalence Complexing Iron after reaction and generation is delivered to by sulphur slurry feeding pump togetherCentrifuge, after centrifugation, sulphur cream is sent outside to battery limit (BL) and treats further to handle, and the divalence Complexing Iron after centrifugation is conveyed by regeneration feed pumpAir is blasted into electrochemical regenerating device to electrochemical regenerating device, while with air-blaster, by the divalence in catalystIron is oxidized to ferric iron, completes regeneration, and the trivalent complexing iron catalyst after regeneration is back in reactor again with circulating pump.
2. 2. the selexol process technique according to claim 1 suitable for floating platform on sea, it is characterised in that describedFollowing chemical reaction occurs in reactor：

   H₂S(g)+H₂O→H₂S(L)+H₂O (1)

   H₂S(L)→H⁺+HS^- (2)

   HS^-+2Fe³⁺L→S+2Fe²⁺L+H⁺ (3)

   O₂(g)+H₂O→O₂(L)+H₂O (4)

   O₂(L)+4Fe²⁺L+2H₂O→4Fe³⁺L+4OH^- (5)。
3. 3. the selexol process technique according to claim 1 suitable for floating platform on sea, it is characterised in that describedTemperature in reactor is 28-32 DEG C, pressure 35-50kPa, and flowing gas liquid ratio is 0.56, residence time 2min.
4. 4. the selexol process technique according to claim 1 suitable for floating platform on sea, it is characterised in that describedAcid gas from battery limit (BL) contains 25%H₂S, mol%.
5. 5. the selexol process technique according to claim 1 suitable for floating platform on sea, it is characterised in that describedThe H of purified gas₂S contents<1ppmv.
6. 6. the selexol process technique according to claim 1 suitable for floating platform on sea, it is characterised in that describedAnode of fuel cell and fuel battery negative pole are provided with electrochemical regenerating device, divalence Complexing Iron is generated into trivalent network by oxidationThe reaction for closing iron is used as cathode reaction as anode reaction, oxygen depolarization reaction, and cell load output current is connected in external circuit,Realize the rapid regeneration of trivalent complexing iron catalyst in liquid phase oxidation reduction engineering, it is possible to increase catalyst oxidation regeneration is imitatedRate.