CN103806964A - Method and system for comprehensively utilizing steam turbine dead steam latent heat - Google Patents
Method and system for comprehensively utilizing steam turbine dead steam latent heat Download PDFInfo
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- CN103806964A CN103806964A CN201210438950.3A CN201210438950A CN103806964A CN 103806964 A CN103806964 A CN 103806964A CN 201210438950 A CN201210438950 A CN 201210438950A CN 103806964 A CN103806964 A CN 103806964A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
Abstract
The invention belongs to the technical field of heat energy comprehensive utilization, and particularly relates to a method and system for comprehensively utilizing steam turbine dead steam latent heat. The method comprises the steps that dead steam is exhausted through a steam turbine, and the dead steam exhausted through the steam turbine is transmitted to a waste-heat utilization condensation system which carries out latent heat and condensate the dead steam into water through the dead steam to finish the Rankine cycle. The system comprises the steam turbine and the waste-heat utilization condensation system which is connected with the steam turbine to carry out latent heat and condensate the dead steam through the dead steam to finish the Rankine cycle. A condenser utilizing the waste heat can be a specially-designed low-temperature and multi-effect evaporation sea water desalting plant and can also be a single-effect lithium bromide absorption air conditioner unit. According to the method and system, the low-pressure dead steam latent heat can be efficiently utilized under the condition that the generating efficiency of a turboset is high.
Description
Technical field
The invention belongs to heat integration technical field, be specifically related to a kind of method and system of waste steam latent heat of turbine comprehensive utilization.
Background technique
Utilize traditional steam turbine power generation history of existing over one hundred year.Conventionally, in these systems, heat energy is for generation of high temperature and high pressure steam, and steam rotates by steam turbine drive rotor, and the heat energy of high pressure steam is changed into mechanical energy acting, and mechanical energy both can directly be applied, and also can generate electricity by generator.For obtaining higher (30-45%) conversion efficiency of thermoelectric, the pressure of the exhaust steam tail gas that steam turbine outlet is discharged must be more low better; Conventionally use water-cooled or air-cooled, the solidifying atmospheric pressure of tail gas is lower than 0.1MPa.Traditional water-cooled condenser structure is all shell-and-tube heat exchanger, and wherein condensed water circulates in pipe, by the steam-condensation Cheng Shui in shell.The advantage of this structure is not need the circulating water that condensation is used to carry out special processing, and the maintenance of system and scale removal are also than being easier to.Exhaust steam could be circulated again by blowback to system after being condensed into water, completes Lang Ken circulation.This traditional condensation process can be thrown away the energy that exceedes total amount of heat 50% conventionally, i.e. latent heat in water vapour exhaust steam is not utilized and is thrown away in vain.While adopting water-cooled, although the hot water producing in condensation process can be used for business or resident's heat supply, thereby can promote to a certain extent the utilization ratio of heat energy, this mode is a kind of heat energy utilization of poor efficiency.
Low-temperature multi-effect evaporation seawater desalinization steam used is mostly to bleed from the intermediate section of power station steam turbine at present, pressure is greater than 0.1MPa, the input end that need to send into again desalting seawater through multi-effect evaporation device after step-down starts to evaporate water processed, has wasted high pressure quality steam.And exhaust steam in steam turbine is often by shell-and-tube heat exchanger condensation, exhaust steam latent heat is not utilized and is directly condensed into water, has caused the waste of heat energy.
On the other hand, in the application of cool and thermal power architecture-integral, for Absorption Refrigerator is combined with steam turbine, conventionally must adopt outlet pressure up to 0.4 to 0.8MPa so-called back pressure turbine.But the deficiency of this kind of structure is that generating efficiency can obviously reduce---the generating efficiency of back pressure turbine is only 10% even lower conventionally.
Above-mentioned two situations all must adopt the steam of elevated pressures, have sacrificed the cycle efficiency of steam turbine, and the latent heat of exhaust steam in steam turbine is not also applied simultaneously.Therefore, be necessary to provide in fact a kind of method and system, to overcome the defect of conventional method waste exhaust steam in steam turbine low temperature latent heat, in keeping higher thermal energy generating efficiency, can also efficiently utilize the latent heat of low pressure exhaust steam.
Summary of the invention
The object of the invention is to provide a kind of latent heat that can effectively utilize low pressure exhaust steam, can also keep the method and system of the waste steam latent heat of turbine comprehensive utilization of higher generating efficiency.
The present invention utilizes low-temperature multi-effect evaporation seawater desalinization system, absorption refrigeration unit or other the hot converting system vapour condenser as steam turbine, has both effectively utilized the latent heat of low pressure exhaust steam, can also keep higher generating efficiency.
One aspect of the present invention, provides a kind of method of utilizing steam turbine discharge exhaust steam latent heat, comprises the following steps: steam turbine is discharged exhaust steam; The exhaust steam that steam turbine is discharged transfers to UTILIZATION OF VESIDUAL HEAT IN condenser system.
Optionally, described UTILIZATION OF VESIDUAL HEAT IN condenser system is low temperature multiple-effect distillation seawater desalination system, to produce pure water; Here, low temperature multiple-effect distillation seawater desalination system is as the condenser of exhaust steam in steam turbine, its structure and method are all different with above-mentioned traditional exhaust steam condenser: traditional exhaust steam condenser is all shell-and-tube heat exchanger, and cooling water is walked pipe, and exhaust steam is walked shell and is cooled into water.The present invention is the first order that adopts the low-temperature multi-effect evaporation seawater desalinization device of particular design, a spray-type heat exchanger, wherein pipe is walked in exhaust steam, and use cooling water (through seawater or sewage after the filtration treatment) spray in shell, to the heat exchange method of tube wall, exhaust steam is cooled to water, complete Lang Ken circulation, generate the heat exchange steam of next effect simultaneously, so analogize, multi-stage heat exchanger water processed.
Another aspect of the present invention, adopt the generator of the lithium-bromide absorption-type refrigerating machine group of particular design, a spray-type heat exchanger, wherein pipe is walked in exhaust steam, and make cooling water (lithium-bromide solution of the dilution) spray in shell, to the heat exchange method of tube wall, exhaust steam is cooled to water, complete Lang Ken circulation, simultaneously by the lithium-bromide solution evaporation of dilution, generate concentrated lithium-bromide solution, as the part circulating in lithium bromide refrigerating unit.
Optionally, the input exhaust steam pressure range of described low-temperature multi-effect evaporation seawater desalinization system is 0.013 to 0.1MPa, and preferably pressure range is 0.013 to 0.05MPa; Temperature range is 30 ℃-100 ℃, is preferably 30 ℃-75 ℃.
Preferably, input exhaust steam pressure and the temperature of low-temperature multi-effect evaporation seawater desalinization system correspond to: 0.005MPa, 30 ℃ or 0.008MP, 40 ℃ or 0.013MPa, 50 ℃ or 0.02MPa, 60 ℃.
Optionally, described UTILIZATION OF VESIDUAL HEAT IN condenser system is the low-temperature absorptive refrigerating machine as condenser;
Optionally, the pressure range of the input exhaust steam of described low-temperature absorptive refrigerating machine is 0.03 to 0.1MPa, and temperature range is more than 70 ℃, is preferably 70 ℃-100 ℃.
Preferably, input exhaust steam pressure and the temperature of low-temperature absorptive refrigerating machine correspond to: 0.032MPa, 70 ℃ or 0.048MPa, 80 ℃ or 0.071MPa, 90 ℃.
Another aspect of the present invention, also provides a kind of system of utilizing steam turbine discharge exhaust steam latent heat, comprising: steam turbine, for discharging exhaust steam; UTILIZATION OF VESIDUAL HEAT IN condenser system, is connected with described steam turbine, to utilize the exhaust steam latent heat of steam turbine, and exhaust steam is condensed into water, completes Lang Ken circulation.
Optionally, described UTILIZATION OF VESIDUAL HEAT IN condenser system is low temperature multiple-effect distillation sea water desalting device, this device comprises: steam-supplying system, spray system, multiple effect evaporation tank, fresh-water tank and dense water tank, exhaust steam in steam turbine input steam-supplying system, at the heat exchange in-tube condensation of the first effect evaporating pot, form liquid water, through the heat exchanging tube outlet of the first effect evaporating pot, be circulated back to turbine system.
Wherein, described low temperature multiple-effect distillation sea water desalting device also comprises a condenser, the working fluid of input spray system, through the pipeline preheating of condenser, input spray system, in the end evaporation in an effect evaporating pot, is circulated back to condenser, in condenser tank body, be condensed into water, collect fresh-water tank.
Wherein, the seawater that the working fluid of described spray system is or sewage, after the sprayed sea water evaporation in a upper effect evaporating pot tank, as the input steam of next effect evaporating pot heat exchanging tube, the water that congeals in next effect heat exchanging tube, collects fresh-water tank; The brine producing in the first effect evaporating pot tank, collects dense water tank.
Wherein, the pressure range of the input exhaust steam of described low temperature multiple-effect distillation sea water desalting device is 0.005 to 0.1MPa, and temperature range is 30 ℃ to 100 ℃, is preferably 30 ℃ to 75 ℃.
Optionally, UTILIZATION OF VESIDUAL HEAT IN condenser system is low-temperature absorptive refrigerating machine, comprising: generator, condenser, vaporizer, adsorber, heat exchanger and recycle pump, and the generator of Absorption Refrigerator is connected with described steam turbine; Exhaust steam in steam turbine is condensed into water in generator, completes Lang Ken circulation.
Wherein, the working fluid of described low-temperature absorptive refrigerating machine is lithium-bromide solution, described bromize lithium dilute solution is concentrated by exhaust steam in steam turbine heating evaporation in described generator, vaporize water steam enters condenser condenses and becomes liquid water, then enter low pressure evaporator, take away a large amount of latent heat of vaporization refrigeration in heat exchanger surface evaporation again, refrigerating function is provided; Bromize lithium dilute solution in described generator is condensed into concentrated solution and enters adsorber, after the water vapour producing, is diluted in absorption low pressure evaporator, and sending generator back to through recycle pump carries out next round circulation, and the exhaust steam of condensation is circulated back to turbine system.Wherein, heat exchanger Main Function is the unnecessary heat energy utilizing in concentrated solution, through heat exchanger heat dilute solution, improves the efficiency of utilization of system.
Wherein, the input exhaust steam pressure range of described UTILIZATION OF VESIDUAL HEAT IN condenser system is 0.032MPa to 0.1MPa, and temperature range is more than 70 ℃, is preferably 70 ℃ to 100 ℃.
The present invention compared with prior art, the main distinction and effect thereof are: the present invention utilizes heat energy to produce high temperature and high pressure steam, utilize high temperature and high pressure steam to pass through steam turbine power generation, the low pressure exhaust steam that steam turbine is discharged is used the Absorption Refrigerator or the seawater desalination system that are directly used as turbine condenser.In one embodiment of the invention, adopt the vapour condenser of absorption system as steam turbine.And in another embodiment, turbine condenser adopts the seawater desalination system that produces purified water.Adopt aforesaid way, the latent heat in the low pressure exhaust steam that steam turbine is discharged just can be effectively utilized.Adopt the path of condensing steam turbine to contrast with the steam turbine path that adopts back pressure type, the comprehensive utilization ratio of system will improve more than 30%, can also efficiently utilize the latent heat of low pressure exhaust steam in keeping higher thermal energy generating efficiency, completes Lang Ken circulation.
The present invention directly inputs sea water desalinating unit by exhaust steam in steam turbine and carries out desalination of sea water.When this sea water desalinating unit has substituted the function (exhaust steam is condensed into water) of shell-and-tube heat exchanger in original turbine system, also can completely retains the function of original desalination of sea water.
The invention has the advantages that:
1. omit the shell-and-tube heat exchanger of traditional condenser system, saved cost.
2. omit common seawater desalination system and drawn gas in steam turbine stage casing, then passed through the step of high pressure steam step-down, saved heat energy, improved steam turbine power generation efficiency.
3. traditional steam turbine condenser is a typical shell-and-tube heat exchanger, and wherein cooling water is walked pipe, and shell is walked in exhaust steam, and exhaust steam is directly condensed into water by the surface of water-cooling tube, and the latent heat of exhaust steam is wasted.Adopt the present invention, pipe is walked in exhaust steam, and the seawater of cooling use is walked shell by spray, and exhaust steam residual heat directly can be used for evaporating seawater, and the evaporation steam of next effect is provided, and carries out multi-effect sea water desalting; Meanwhile, exhaust steam is condensed into water in the first effect tank, completes the Lang Ken circulation of turbine system.This method, has broken through the narrow limitation of original two self-contained units, thereby has improved overall efficiency of utilization.
The advantage of lithium-bromide absorption-type refrigerating machine is also like this.
Accompanying drawing explanation
Fig. 1 is the structural representation that in one embodiment of the invention, steam turbine is connected with the low-temperature multi-effect evaporation seawater desalinization system as condenser.
Fig. 2 is steam turbine and the structural representation being connected as the lithium-bromide absorption-type refrigerating machine of condenser in another embodiment of the present invention.
Number in the figure: 100 is steam turbine, 101 is exhaust steam or the 1st effect input steam, 102 is the 1st effect output steam (being also the input steam of the 2nd effect), 103 is the sprayed sea water of the 1st effect input, and 104 is the output steam of the 2nd effect, and 105 is the sprayed sea water of the 2nd effect input, 106 is the concentrated salt solution through the evaporation of N effect, 107 is the fresh water that the first effect condensation is got off, and will be sent back to the circulation loop of steam turbine, completes Lang Ken circulation, 108 is N-2 single-effect evaporator, 109 is N-1 effect output steam, 110 is the sprayed sea water of N-1 effect input, 111 is N effect output steam, 112 is each effect output fresh water, 113 is the sprayed sea water of N effect input, 114 is original feed seawater, 115 is the final condenser of N effect steam, 116 is threeway, 117 is fresh-water tank, 118 is the output fresh water of final condenser, 120 for getting back to marine pipeline, refrigerated sea water partial replacement used condenser 115 is arrived marine, 121 is the output of freshwater product, 123 is N-2 effect input steam, 124 is the sprayed sea water of N-2 effect.
202 is absorption refrigeration unit, and 203 is generator, and 204 is spray equipment, and 205 is steam, 207 is water, and 208 is condenser, and 209 is condensed water, and 210 is condensed water, 211 is control valve, and 212 is vaporizer, and 213 is cryogen water, and 214 is cryogen water, 215 is drencher, and 216 is pipeline, and 217 is bromize lithium dilute solution, 218 is dense lithium-bromide solution, and 219 is heat exchanger, and 220 is spray equipment, 221 is adsorber, and 222 is cooling water, and 223 is cooling water.
Embodiment
In the following description, in order to make reader understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs and the many variations based on following mode of execution and modification, also can realize the each claim of the application technological scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.In figure, same or analogous member uses the same reference numerals to represent.It should be noted that, in all narrations in literary composition, seawater can change sewage into and not lose authenticity and the usability of all relevant narrations.
Fig. 1 shows the schematic diagram of low temperature multi-effect seawater desalting system as exhaust steam in steam turbine condenser.As shown in the figure, steam turbine 100 after producing electric energy drains into exhaust steam 101 as the low temperature and low pressure steam entrance of the seawater desalination system of vapour condenser, and the exhaust steam pressure that wherein the progression N of multiple effect evaporator is discharged by turbine discharge mouth 101 is determined.In the present embodiment, the vapor pressure scope that turbine discharge mouth 101 is discharged is 0.008 to 0.1MPa.
The present invention is condensed into liquid water 107 by the exhaust steam 101 that steam turbine is discharged as the first effect input steam of low-temperature multi-effect evaporation seawater desalinization in parallel heat exchanging tube, completes Lang Ken circulation; The seawater 103 of spray, absorbing the generation secondary steam substantially suitable with condensation number after latent heat, enters next effect heat exchanging tube as the input steam 102 of the second effect.The process of evaporation, condensation repeats in each effect, produces the distilled water of basic equivalent, is collected by the road by fresh-water tank 117.Last effect produce steam 111 in condenser 115 by 114 condensations of original feed seawater, also preheating this charging seawater 114.Non-condensible gas is enrichment in condenser, is extracted out by vacuum pump, guarantees that the process of evaporation-condensation heat exchange is efficiently carried out.
Working procedure of the present invention is as follows: first enter stram condenser 115(seawater preheating device through a water pump through suitably filtering with the original feed seawater 114 of other relevant treatment) middle preheating, degassed, and last residual steam 111 is condensed into water, condensed water 119 is got back to freshwater product container 117, completes the whole Lang Ken circulation of steam turbine power generation; Meanwhile, the seawater after preheating is through a threeway 116, and a part is as the charging seawater 113 of still-process, and 120 of another part are expelled back in the sea again through a control valve.Enter the seawater 113 of still-process adding last effect (N effect) container for evaporation that first enters sea water desalinating unit after antisludging agent, after spray heat exchange, generate last effect steam 111.Unevaporated last effect residual seawater feed liquid 110 is transported to by pump in the evaporation equipment of a upper effect (N-1 effect), as the working fluid of N-1 effect spray, evenly be injected on the heat exchanger pipe bundle of N-1 effect evaporating pot through N-1 effect sprinkling equipment, in absorption tube, partly flashed to N-1 effect water vapour 109 from the latent heat of vaporization of a upper effect steam 123 and with the form of falling film evaporation, as the input thermal source of next effect (N effect), the water vapor 123 of this effect input is condensed into fresh water simultaneously, enters fresh water storage tank 117 through water pipe 112; 124 of unevaporated N-1 effect residual seawater feed liquids are transported in upper effect (N-2 effect) evaporation group that temperature is higher by transfer pump, and as the working fluid of N-2 effect nozzle, spray is on the heat exchanger pipe bundle of N-2 effect evaporating pot; Repeatedly repeat this process, until the first effect, steam is directed to the exhaust steam output terminal 101 of steam turbine, after the exhaust steam 101 that steam turbine is discharged is used to the latent heat in exhaust steam through sea water desalinating unit as the input steam of the first effect, is condensed into water in heat exchanging tube; The fresh water 112 that the condensation of each effect produces is collected by fresh-water tank 117 by the road, completes Rankine cycle.Salt solution 106 concentrated after desalination of sea water can directly be sent into sea, also can do further processing, makes sea salt or other industrial chemicals.
Fig. 2 shows exhaust steam in steam turbine and is applied to the schematic diagram of absorption system.Wherein absorption system is lithium-bromide absorption-type refrigerating machine.This lithium-bromide absorption-type refrigerating machine, comprising: generator 203, condenser 208, vaporizer 212, adsorber 221, heat exchanger 219 and recycle pump, and the generator of refrigerator is connected with described steam turbine; Wherein, generator 203 comprises spray equipment 204 and the tube bank of heat radiation below, and adsorber 221 comprises spray equipment 220 and heat exchanger pipe bundle below, and vaporizer 212 comprises drencher 215 and cryogen water pipe below; The present invention by exhaust steam 101 that steam turbine 100 is discharged in the absorption refrigeration unit (mono-potency lithium bromide absorption type air-conditioner unit) 202 of transporting to as vapour condenser.This Absorption Refrigerator produces cryogen water by the low-temperature evaporation of water under vacuum state and uses for the air-conditioning of building.Exhaust steam 101 completes Lang Ken circulation be condensed into water 207 in generator 203 after.
Working procedure of the present invention is as follows: exhaust steam in steam turbine 101 enters the heat radiation tube bank of the generator 203 of mono-potency lithium bromide absorption type air-conditioner unit 202 by pipeline, bromize lithium dilute solution pipeline 217 from adsorber 221 is sprayed by spray equipment 204 on the outer surface of above-mentioned tube bank, absorb the latent heat of phase change of exhaust steam and generating steam 205 through falling film evaporation, this steam obtains condensation by Pipeline transport in condenser 208; Meanwhile, the exhaust steam in generator tube bank is condensed into water 207, plays the effect of vapour condenser, completes Lang Ken circulation.The condensed water 209/210 that steam 205 is condensed in device 208 is condensed into water, enters vaporizer 212 by control valve 211.The inner condition of high vacuum degree that keeps of vaporizer, makes drencher 215 spray the water that arrives cryogen water tube outer surface 5 degrees Celsius of explosive evaporations, and latent heat of phase change when evaporation is cooled to 7 degree (214) by cryogen water 213 from 12 degree.The low-pressure water steam producing in vaporizer 212 enters adsorber 221 through pipeline 216, dense lithium-bromide solution from generator 203 passes into heat exchanger 219 by pipeline 218, spray on the outer surface of heat exchanger pipe bundle of adsorber 221 through spray equipment 220 again, the dense lithium-bromide solution in the future vapor absorption of from evaporator drier 212 generates the lithium-bromide solution diluting, and the latent heat of emitting in absorption process is brought environment into by cooling water 222/223 and carried out cooling.The lithium-bromide solution of dilution, is entering heat exchanger 219 by pipeline 217, then sprays by spray equipment 204 on the outer surface of heat radiation tube bank of generator 203, repeats next circulation.
Adopt traditional back pressure turbine, the exhaust steam pressure 0.6MPa left and right of steam turbine; Its generating efficiency is generally 8%, considers that electricity refrigeration ratio is 4, and the refrigerating efficiency after amounting to is 32%; The turbine discharge of 0.6MPa can also be used to drive the Absorption Refrigerator of economic benefits and social benefits, and because its refrigeration ratio is 1.4, thereby the refrigerating efficiency of this refrigerator is 91%.Like this, total refrigerating efficiency of back pressure turbine is 123%.In another case, adopt condensing steam turbine of the present invention, its exhaust steam pressure is in 0.03MPa left and right, and its generating efficiency can reach 30% efficiency conventionally, considers that electricity refrigeration ratio is 4, and the refrigerating efficiency after amounting to is 120%; The exhaust steam of 0.03MPa can only drive a single-effective absorption air conditioner as vapour condenser, and now single-action formula refrigeration ratio is 0.65, and the refrigerating efficiency after amounting to is 45%, thereby the refrigerating efficiency of entirety reaches 165%.That is to say, adopt the path of condensing steam turbine of the present invention to contrast with the steam turbine path that adopts back pressure type, the comprehensive utilization ratio of system will improve more than 30%.Therefore, this method and system can keep the generating efficiency of steam turbine set can also efficiently utilize the latent heat of low pressure exhaust steam.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and described, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (12)
1. a method of utilizing steam turbine discharge exhaust steam latent heat, is characterized in that, comprises the following steps:
Steam turbine is discharged exhaust steam;
The exhaust steam that steam turbine is discharged transfers to UTILIZATION OF VESIDUAL HEAT IN condenser system;
UTILIZATION OF VESIDUAL HEAT IN condenser system is utilized exhaust steam latent heat, and exhaust steam is condensed into water, completes Lang Ken circulation.
2. method according to claim 1, is characterized in that, described UTILIZATION OF VESIDUAL HEAT IN condenser system is low temperature multiple-effect distillation seawater desalination system, to produce fresh water.
3. method according to claim 2, is characterized in that, the pressure range of the input exhaust steam of described low temperature multiple-effect distillation seawater desalination system is 0.005 to 0.1MPa, and temperature range is 30 ℃ to 100 ℃, is preferably 40 ℃ to 75 ℃.
4. method according to claim 1, is characterized in that, described UTILIZATION OF VESIDUAL HEAT IN condenser system is the Absorption Refrigerator as condenser.
5. method according to claim 4, is characterized in that, the input exhaust steam pressure range of described UTILIZATION OF VESIDUAL HEAT IN condenser system is 0.032MPa to 0.1MPa, and temperature range is more than 70 ℃, is preferably 70 ℃ to 100 ℃.
6. a system of utilizing steam turbine discharge exhaust steam latent heat, is characterized in that, comprising:
Steam turbine, for discharging exhaust steam;
UTILIZATION OF VESIDUAL HEAT IN condenser system, is connected with described turbine system, utilizes the exhaust steam latent heat of steam turbine, and exhaust steam is condensed into water, completes Lang Ken circulation.
7. system according to claim 6, it is characterized in that, described UTILIZATION OF VESIDUAL HEAT IN condenser system is low temperature multiple-effect distillation sea water desalting device, comprise: seawater water intaking filtration system, spray system, multiple effect evaporation tank, fresh-water tank and dense water tank, exhaust steam in steam turbine input steam-supplying system, at the heat exchange in-tube condensation of the first effect evaporating pot, form liquid water, through the heat exchanging tube outlet of the first effect evaporating pot, be circulated back to turbine system.
8. system according to claim 7, it is characterized in that, the working fluid of the spray system of described low temperature multiple-effect distillation sea water desalting device is through the seawater of filtration treatment or sewage, after sprayed sea water evaporation in a upper effect evaporating pot tank, imitate the input steam of evaporating pot heat exchanging tube as next, at next effect water that congeals in heat exchanging tube, collect fresh-water tank; The brine producing after multiple effect evaporation, collects dense water tank.
9. system according to claim 7, is characterized in that, the pressure range of the input exhaust steam of described low temperature multiple-effect distillation sea water desalting device is 0.005 to 0.1MPa, and temperature range is 30 ℃ to 100 ℃, is preferably 30 ℃ to 75 ℃.
10. system according to claim 6, it is characterized in that, described UTILIZATION OF VESIDUAL HEAT IN condenser system is low-temperature absorptive refrigerating machine, comprise: generator, condenser, vaporizer, adsorber, heat exchanger and recycle pump, described steam turbine is connected with the generator of absorption cold machine, exhaust steam in steam turbine is condensed into water in generator, completes Lang Ken circulation.
11. systems according to claim 10, it is characterized in that, the working fluid of described Absorption Refrigerator is lithium-bromide solution, described lithium-bromide solution is heated by exhaust steam in steam turbine in described generator, vaporize water steam enters condenser condenses and becomes low temperature liquid water, enter again afterwards flash distillation occurs in vaporizer, described bromize lithium dilute solution becomes concentrated solution and enters adsorber, after absorbing low temperature water steam, dilute, recycle pump is sent generator back to, and in generator, the exhaust steam of condensation is circulated back to turbine system.
12. systems according to claim 10, is characterized in that, the input exhaust steam pressure range of described UTILIZATION OF VESIDUAL HEAT IN condenser system is 0.032MPa to 0.1MPa, and temperature range is more than 70 ℃, are preferably 70 ℃ to 100 ℃.
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| CN104310687A (en) * | 2014-10-16 | 2015-01-28 | 苏州欧拉工程技术有限公司 | Efficient MVR integrated seawater desalination device and seawater desalination method |
| CN105134316A (en) * | 2015-08-19 | 2015-12-09 | 安徽新宁能源科技有限公司 | Lithium bromide refrigeration and power generation system |
| CN106219855A (en) * | 2016-09-06 | 2016-12-14 | 大唐环境产业集团股份有限公司 | Direct Air-cooled Unit recuperation of heat and water treatment facilities and recuperation of heat and method for treating water |
| CN108518719A (en) * | 2018-03-30 | 2018-09-11 | 大连葆光节能空调设备厂 | A kind of big temperature-difference central heating system using double condensers |
| CN108623065A (en) * | 2017-03-22 | 2018-10-09 | 天华化工机械及自动化研究设计院有限公司 | The recoverying and utilizing method of PTA refined unit mother liquors |
| CN108895708A (en) * | 2018-05-16 | 2018-11-27 | 江苏科技大学 | A kind of exhaust heat stepped recycle device and working method |
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| CN108518719A (en) * | 2018-03-30 | 2018-09-11 | 大连葆光节能空调设备厂 | A kind of big temperature-difference central heating system using double condensers |
| CN108895708B (en) * | 2018-05-16 | 2020-07-28 | 江苏科技大学 | Waste heat gradient recycling device and working method |
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| CN109340953A (en) * | 2018-08-22 | 2019-02-15 | 东南大学 | The absorption adjustable heating of accumulation energy type and cold supply system |
| CN109340953B (en) * | 2018-08-22 | 2020-12-11 | 东南大学 | Energy storage type absorption adjustable heating and cooling system |
| CN111573764A (en) * | 2020-05-28 | 2020-08-25 | 山东建筑大学 | Cold-hot coupling tower type seawater desalination system utilizing ship waste heat and application method |
| CN111892110A (en) * | 2020-08-13 | 2020-11-06 | 集美大学 | Solution energy storage type seawater desalination system |
| CN112939124A (en) * | 2021-03-30 | 2021-06-11 | 上海核工程研究设计院有限公司 | Novel low-temperature exhaust-heat seawater desalination system and method |
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