The heat supply unit that compression heat pump and hot-water heating system combineTechnical field
The utility model relates to energy field, disclose a kind of electric energy drive compression formula heat pump that utilizes and reclaimed the waste heat comprising in the recirculated water of the cooling turbine discharge of power plant, and through hot-water heating system, further promoted temperature and meet the compression heat pump of heat supply needs and the heat supply unit that hot-water heating system combines.
Background technology
In turbine exhaust steam in electric power plant, contain amount of heat, for setting up the low-temperature receiver of generating thermodynamic cycle, must heat delivery to cooling tower be discharged in atmosphere by recirculated water, or be discharged in atmosphere by air-cooling apparatus, account for more than 30% low grade residual heat of power plant's input heat and be wasted.The 330MW heat supply unit of take is example, and heat-recoverable 126MW in Heating Period, can increase area of heat-supply service 2,520,000 square meter sides, and can reduce the cooling tower water loss that wafts, and saves great lot of water resources.
Due to the problem of power plant's ubiquity pump gas ablity deficiency, so use steam-powered absorption heat pump and the compression heat pump can only limited recovery electric power plant circulating water waste heat.
Heating period nocturnal temperature is low, supplies thermal spike period and electrical network underload period to coincide.Steam power plant just can participate in peak regulation under the prerequisite that guarantees heat supply and unit safety operation, thereby must generate electricity by large load, causes electrical network to receive the ability of other electric weight sharply to decline.Be again the period that wind power resources situation is good night, wind-power electricity generation but cannot be surfed the Net, produced thermoelectricity and completely sent out the contradiction that wind-powered electricity generation is abandoned generating, produced that clean energy resource wastes and the contradiction situation of burning coal heat supply.
The patent No. is that the Chinese invention patent of 200810101065.X discloses a kind of large temperature-difference central heating system, and this system comprises steam turbine, condenser, steam absorption heat pump, steam water heat exchanger, hot water absorption heat pump, water-water heat exchanger and connecting line and annex.Low-temperature heat supply pipe network backwater returns after power plant, first enters condenser, sends after being preheated intensification, sends after entering steam drive absorption heat pump post bake, then enters and in steam water heat exchanger, heat for the third time and send power plant's heat supply.Steam turbine not level steam discharge enters in condenser, heat cycles water, preheating low temperature heat supply network backwater; Extracted steam from turbine one tunnel enters steam absorption heat pump as driving heat source, post bake heat supply network backwater; Drawing gas and enter steam water heat exchanger in another road of steam turbine, heats for the third time heat supply network backwater.This patent is system complex not only, has changed the therrmodynamic system of power plant simultaneously; Between two systems, influence each other, operating process is complicated; Recovery waste heat needs power plant to draw gas, and heating for the third time heat supply network backwater also needs power plant to draw gas, and recovery waste heat is limited.So limitation is larger.
The patent No. is that 200910076073.8 Chinese invention patent discloses a kind of compression type heat heat pump heating system and heat supply method, and this system comprises compressor, boiler, choke valve, heat storage tank, collecting plate, cross valve and air heat exchanger.It is to be that heat supply hot water heats in conjunction with air-source and two kinds of low-temperature heat source thermal-arrest modes of solar energy, can not reclaim residual heat of electric power plant, and complex structure, is only applicable to small size heat supply, and the gentle sunlight impact of being bullied is larger, and therefore, limitation is larger.Above-mentioned two kinds of prior aries are structure and complicated operation not only, reclaims heat limited ability system, and does not consider and use heat supply in winter wind-powered electricity generation in period to abandon wind-powered electricity generation amount to save the energy.
Given this, need to design a kind of complete heat supply unit based on reclaiming residual heat of electric power plant workable on the basis of economical and energy saving environmental protection.At heating period, the recirculated water of cooling turbine exhaust steam in electric power plant of take is thermal source, utilize electric energy drive compression formula heat pump to guarantee heat supply base load, in night and extremely cold time, by electric heater unit or the power plant assurance peakload of drawing gas, thereby dissolve to the full extent low ebb electric weight, or a large amount of steam of dissolving reduces power plant's generation load, the wind-powered electricity generation of objectively dissolving is abandoned wind-powered electricity generation amount, thereby expands power plant's central heating ability, improves economy of power plant and social benefit.
Utility model content
In order to solve the problems of the technologies described above, the heat supply unit that the utility model provides a kind of compression heat pump and hot-water heating system to combine.Adopt compression heat pump to reclaim the tow taste heat in the recirculated water of cooling turbine exhaust steam in electric power plant, and supplying hot water is once heated, by hot-water heating system, supplying hot water post bake is temperature required to final heat supply again, heat supply set structure and operating process are simple and convenient, be easy to realize, and firing rate is fast, heat cost is low, economic, energy-conservation environmental protection again.In turbine exhaust steam in electric power plant, contain a large amount of tow taste heats, for setting up the low-temperature receiver of generating thermodynamic cycle, must heat delivery to cooling tower be discharged in atmosphere by recirculated water, or be discharged in atmosphere by air-cooling apparatus, account for more than 30% low grade residual heat of power plant's input heat and be wasted.
The 330MW heat supply unit of take is example, design steam discharge enthalpy, and 2557.4kj/kg, solidifying water enthalpy, 130.1kj/kg, single steam turbine waste heat amount:
Q=G * (hrow-hsolidifying)
=187.8÷3600×1000×（ 2557.4-130.1）÷1000=126MW
Q---waste heat amount, MW
During the G----maximum amount of drawing gas, exhaust steam amount, t/h
Hrowsteam discharge enthalpy, kj/kg
Hsolidifyingsolidifying water enthalpy, kj/kg
4 40MW are installed, and the compression heat pump of general power 160MW reclaims turbine exhaust heat, heat pump energy efficiency coefficient 4, heat pump power of motor 4 * 10MW.27 ℃ of recirculated waters that turbine condenser is discharged enter heat pump, are cooled to 18 ℃ and return to condenser.The heat supply network backwater of 50 ℃ enters heat pump, is heated to 80 ℃.
Heat pump moved continuously in the heating phase, year heating load 160 * 3600 * 24 * 149=206 Wan Jijiao.Heat pump heat supply network water out is installed the electric heater unit of a set of general power 160MW, and 80 ℃ of hot net waters are further heated to 110 ℃.The hot net water of 110 ℃ enters heat supply network heat supply.The non-valley power consumption amount of heat pump motor: 4 * 10 * 15 * 14,9=8,940 ten thousand degree.
Electric heater unit 22 moved 9 hours up to 7 o'clock next day, year heating load 160 * 3600 * 9 * 149=77 Wan Jijiao.Year valley power consumption amount: 160 * 9 * 149,=21,456 ten thousand degree.
Total capacity 320MW, by 50 watts of/square metre of estimations of design space-heating load index, 6,400,000 square metres of area of heat-supply services.
Project year valley power consumption amount, the wind-powered electricity generation of dissolving is abandoned wind-powered electricity generation amount: 26,820 ten thousand degree year.Press wind field design year hours of operation 4000 hours, by abandoning wind 10% winter, calculate, solve the wind problem of abandoning of 670,000 kilowatts of wind-powered electricity generations.
Save 5.72 ten thousand tons, mark coal recovery waste heat year, dissolve to abandon and save 2.64 ten thousand tons, mark coal wind-powered electricity generation amount year.
The cooling tower water loss that wafts is generally 1.5% of discharge, by compression heat pump cool cycles, can reduce water loss 14000m3/h * 1.5% loss amount * 24h * 149 heating day of wafing=750,000 tons winter.
To achieve these goals, the utility model adopts following technical scheme:
The heat supply unit that a kind of compression heat pump and hot-water heating system combine, comprise compression heat pump system, hot-water heating system, recirculated water water inlet pipe and water outlet pipe and annex, supplying hot water water inlet pipe and water outlet pipe and annex, is characterized in that: described compression heat pump system is comprised of evaporimeter, condenser, compressor, drive motors, connecting line and annex; Described compression heat pump system is connected with outside heating network with outside power plant steam turbine condenser respectively and passes through working medium transferring heat in system.
Preferably, described recirculated water water inlet pipe and water outlet pipe and annex comprise circulating water inlet and two pipelines of circulating water outlet pipe, described turbine condenser are connected with described compression heat pump system and conducting formation closed cycle.
In above-mentioned arbitrary technical scheme, preferably, described circulating water inlet is connected the delivery port of described power plant steam turbine condenser with the water inlet of described evaporimeter, high temperature circulation water is imported in evaporimeter.
In above-mentioned arbitrary technical scheme, preferably, described circulating water outlet pipe is connected the water inlet of described power plant steam turbine condenser with the delivery port of described evaporimeter, cooled recirculated water is passed back in turbine condenser.
In above-mentioned arbitrary technical scheme, preferably, described supplying hot water water inlet pipe and water outlet pipe and annex comprise heat supply water inlet pipe and two pipelines of heat supply outlet pipe, and the heat supply unit that described compression heat pump is combined with hot-water heating system is connected with outside heating network and conducting.
In above-mentioned arbitrary technical scheme, preferably, described supplying hot water water inlet pipe is connected outside heating network with described condenser, and supplying hot water is delivered in described condenser.
In above-mentioned arbitrary technical scheme, preferably, described supplying hot water outlet pipe is connected in series described condenser, described hot-water heating system and outside heating network successively, and the supplying hot water that is heated to heat supply temperature is delivered to outside heating network.
In above-mentioned arbitrary technical scheme, preferably, described evaporimeter, condenser, compressor are connected conducting and are formed loop by described connecting line and annex.
In above-mentioned arbitrary technical scheme, preferably, described drive motors is connected with described compressor, and drives its running.
In above-mentioned arbitrary technical scheme, preferably, described working medium is gas, and has good mobility and after being heated, have significant dilatancy.
In above-mentioned arbitrary technical scheme, preferably, described compression heat pump system can be the compression heat pump system of electric energy or high steam driving.
In above-mentioned arbitrary technical scheme, preferably, described hot-water heating system can be electric heater unit, steam heater, hot-water heating system or electric accumulation of energy heater.
The heat supply unit that compression heat pump of the present utility model and hot-water heating system combine, by use compression heat pump to replace the traditional cold radiator coolers such as power plant steam turbine cooling tower that recirculated water in turbine condenser is directly accessed in compression heat pump and lower the temperature absorb simultaneously again recirculated water is transmitted back to after heat turbine condenser with continuation to steam turbine absorbing and cooling temperature, compression heat pump passes to heat supply backwater by heat in recirculated water and tentatively heats, through hot-water heating system, heat supply backwater is carried out to post bake again, so that it reaches heating, require temperature.The utility model takes full advantage of and supplies thermal spike period and electrical network underload period to coincide, winter, steam power plant was that heat supply must be generated electricity by large load, wind-powered electricity generation yields the feature of generating, utilize compression heat pump that electric energy drives to reclaim the heat in the recirculated water of cooling turbine exhaust steam in electric power plant, guarantee heat supply base load; In night and extremely cold time, utilize electric power or reduce drawing gas of power plant's generation load supplying hot water is carried out to post bake, guarantee heat supply peakload.Not only more realistic action need is saved the energy simultaneously, reduces environmental pollution, has reduced heat cost, and this heat supply unit heater was simple in structure in the past, than mode of heating in the past, more simplify fast.
Accompanying drawing explanation
The schematic diagram of the embodiment that Fig. 1 is the heat supply unit that combines according to compression heat pump of the present utility model and hot-water heating system.
The schematic diagram of the another embodiment that Fig. 2 is the heat supply unit that combines according to compression heat pump of the present utility model and hot-water heating system.
Reference numeral:
1, compression heat pump, 2, hot-water heating system, 3, circulating water inlet, 4, circulating water outlet pipe, 5, condenser, 6, water circulating pump, 7, evaporimeter, 8, condenser, 9, compressor, 10, drive motors, 11, supplying hot water water inlet pipe, 12, supplying hot water outlet pipe, 13, cooling tower.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated, below describe only conduct demonstration and explain, the utility model is not done to any pro forma restriction.
Embodiment mono-:
As shown in Figure 1, recirculated water for cooling turbine exhaust steam in electric power plant enters in electric energy drive compression formula evaporator with heat pump 7 by circulating water inlet after turbine condenser 5 absorbs heat, evaporimeter 7 interior by cryogenic fluid absorbing and cooling temperature after by the defeated back-steam turbine condenser 5 of circulating water outlet pipe 4, start the absorbing and cooling temperature process to turbine discharge of a new round, and so forth.Compression heat pump system 1 is connected evaporimeter 7, condenser 8, compressor 9 successively and forms loop by interconnecting tube road and recycles in compression heat pump system 1 for working medium.The interior working medium of compression heat pump system evaporimeter 7 absorb absorb heat after low-grade recirculated water heat working medium by compressor 9 by connecting line suction wherein, under the driving of drive motors 10, will after working medium boil down to HTHP, by connecting line, be delivered in condenser 8 again, in the interior HTHP working medium of condenser 8, lowered the temperature and releases heat, meanwhile the heat supply backwater of 50 ℃ is entered in condenser 5 by outside heating network by heat supply water inlet pipe 11, 50 ℃ of heating network backwater in condenser 5 are heated to 80 ℃ by the heat release of HTHP working medium, by supplying hot water outlet pipe 12, enter hot-water heating system 2, working medium after heat release is by connecting line Returning evaporimeter 7, start the thermodynamic cycle process of evaporation of evaporation (drawing the heat in the recirculated water)-compression condensation (emitting heat to heating network backwater) of a new round-again.Working medium after liquidation exothermic reaction gets back to through connecting line heat absorption evaporation and the heat release condensation cycle that starts next cycle in evaporimeter 7.Compressed formula heat pump 1 is heated to the supplying hot water of 80 ℃, in electric heater unit, is further heated, and is up to the required heat supply temperature of 110 ℃ and by supplying hot water water outlet 12 pipes, enters outside heating network user is carried out to heat supply.
Embodiment bis-:
As shown in Figure 2, recirculated water for cooling turbine exhaust steam in electric power plant enters in electric energy drive compression formula evaporator with heat pump 7 by circulating water inlet 3 after turbine condenser 5 absorbs heat, evaporimeter 7 interior by cryogenic fluid absorbing and cooling temperature after by the defeated back-steam turbine condenser of circulating water outlet pipe 4, start the absorbing and cooling temperature process to turbine discharge of a new round, and so forth.In the present embodiment; turbine condenser 5 is also parallel with a loop that enters cooling tower 13 except being connected with compression heat pump system evaporimeter 7; for superfluous or do not reach the cooling temperature required recirculated water of steam turbine extra cooling device is provided, by water circulating pump 6 will containing the recirculated water having surplus heat deliver to cooling tower 13 tops and by high-altitude precipitation by circulating water.In main heat supplying pipeline, compression heat pump system 1 is connected evaporimeter 7, condenser 8, compressor 9 successively and forms loop by interconnecting tube road and recycles in compression heat pump system 1 for working medium.The interior working medium of compression heat pump system evaporimeter 7 absorbs after low-grade recirculated water heat, by compressor 9 by connecting line suction wherein, under the driving of drive motors 10, will after working medium boil down to HTHP, by connecting line, be delivered in condenser 8 again, in the interior HTHP working medium of condenser 8, lowered the temperature and releases heat, meanwhile the heat supply backwater of 50 ℃ is entered in condenser 5 by outside heating network by heat supply water inlet pipe 11, 50 ℃ of heat supply backwater in condenser 5 are heated to 80 ℃ by the heat release of HTHP working medium, by heat supply outlet pipe, enter hot-water heating system 2, working medium after heat release is by connecting line Returning evaporimeter 7, start the thermodynamic cycle process of evaporation of evaporation (drawing the heat in the recirculated water)-compression condensation (emitting heat to heat supply network backwater) of a new round-again.Working medium after liquidation exothermic reaction gets back to through connecting line heat absorption evaporation and the heat release condensation cycle that starts next cycle in evaporimeter 7.Compressed formula heat pump 1 is heated to the heat supply network backwater of 80 ℃, in electric heater unit, is further heated, and is up to the required heat supply temperature of 110 ℃ and by supplying hot water outlet pipe 12, enters outside heating network user is carried out to heat supply.
The heat supply method of the heat supply unit that compression heat pump and hot-water heating system combine, comprises the following steps:
1, in turbine condenser, recirculated water is lowered the temperature and extracts heat through evaporimeter;
2, working medium is compressed by compressor;
3, working medium release heat heating heating network backwater in condenser after compression;
The heating network backwater through once heating of 4, discharging in condenser is delivered to outside heating network after being heated to required heat supply temperature in hot-water heating system.
Step 1, in, recirculated water absorbs heat in the cooling steam discharge process of turbine condenser 5, with the recirculated water of low grade residual heat, by circulating water inlet, enter that evaporimeter 7 is rear lower the temperature by working medium in evaporimeter and extract after heat by circulating water outlet pipe foldback back-steam turbine condenser 5, the heat absorption and release that starts next cycle circulates.
Step 2, in, compressor 9 suctions that the driven motor 10 of the interior high-temperature steam working medium of evaporimeter 7 drives are walked and are compressed into high temperature and high pressure gas and are delivered in condenser 8 by connecting line, high-temperature steam working medium is pumped, new cryogenic fluid enters evaporimeter 7, maintain the interior environment under low pressure of evaporimeter 7, be beneficial to the vaporization of absorbing heat therein of new working medium.
Step 3, in, 50 ℃ of backwater that complete after heat supply in outside heating network enter condenser 8 through supplying hot water water inlet pipe 11, condenser 8 with release heat and in order to heat supplying hot water to 80 ℃, is realized the HTHP working medium liquefaction after overcompression heat exchange and is taken away a large amount of heats of vaporization.
Step 4, in, the heat supply network backwater after heating once enters hot-water heating system 2 by supplying hot water outlet pipe 12, and is heated within it and is up to after 110 ℃ temperature required, is delivered to outside heating network carries out heat supply through supplying hot water water inlet pipe and water outlet pipe 12.
The heat supply unit that compression heat pump of the present utility model and hot-water heating system combine, comprises compression heat pump system, hot-water heating system, recirculated water water inlet pipe and water outlet pipe and annex, supplying hot water water inlet pipe and water outlet pipe and annex; By using compression heat pump to replace the traditional cold radiator coolers such as power plant cooling tower, the recirculated water of cooling turbine discharge is directly accessed in compression heat pump and lowered the temperature and absorb after heat simultaneously, again recirculated water is transmitted back to turbine condenser to continue cooling steam discharge, the backwater that compression heat pump passes to heating network by heat in recirculated water once heats, through hot-water heating system, supplying hot water is carried out to post bake again, so that it reaches heating, require temperature.Heating period nocturnal temperature is low, supply thermal spike period and electrical network underload period to coincide, steam power plant just can participate in peak regulation under the prerequisite that guarantees heat supply and unit safety operation, thereby must generate electricity by large load, cause electrical network to receive the ability of other electric weight sharply to decline, wind-power electricity generation but cannot be surfed the Net, compare with heat supply unit of the prior art, the heat supply unit that compression heat pump of the present utility model and hot-water heating system combine takes full advantage of and supplies thermal spike period and electrical network underload period to coincide, winter, steam power plant was that heat supply must be generated electricity by large load, wind-powered electricity generation yields the feature of generating, utilize compression heat pump that electric energy drives to reclaim the heat in the recirculated water of cooling turbine exhaust steam in electric power plant, guarantee heat supply base load, heating period night and extremely cold time, utilize electric power or reduce drawing gas of power plant's generation load supplying hot water is carried out to post bake, guarantee heat supply peakload.Not only more realistic action need is saved the energy simultaneously, reduces environmental pollution, has reduced heat cost, and this heat supply unit heater was simple in structure in the past, than mode of heating in the past, more simplify fast.Between heat supply unit of the present utility model and outside plant condenser, only there is the circulation syndeton of recirculated water, reclaim the heat that in the recirculated water of cooling turbine exhaust steam in electric power plant, most worthy reclaims, there is no other unnecessary confession heat structures, therefore the heat supply unit that compression heat pump of the present utility model and hot-water heating system combine is simple in structure, mode is convenient, take full advantage of the feature that compression heat pump efficiency is high, by using electric energy to drive heat supply unit, thereby be that heat supply must be generated electricity by large load to having solved steam power plant, the contradiction that wind-powered electricity generation yields generating has been brought a set of heat supply unit and the method for more economical safety and environmental protection.
The above is only that preferred embodiment of the present utility model is described; not that scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model, all should fall in the definite protection domain of claims of the present utility model.