CN113175664B - Recycling device and method for mixed working medium of feed water heating system - Google Patents
Recycling device and method for mixed working medium of feed water heating system Download PDFInfo
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- CN113175664B CN113175664B CN202110420920.9A CN202110420920A CN113175664B CN 113175664 B CN113175664 B CN 113175664B CN 202110420920 A CN202110420920 A CN 202110420920A CN 113175664 B CN113175664 B CN 113175664B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/22—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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Abstract
The invention discloses a recycling device and a recycling method for mixed working medium of a feed water heating system 2 Gas and high-pressure drainage are carried out, the high-pressure drainage automatically flows into a water outlet pipe of the high-pressure heater by utilizing pressure difference, drainage recycling is realized, and high-pressure CO is recycled 2 The water supply of the gas heating medium-pressure water supply heater realizes CO 2 Recycling gas waste heat; the cooled medium-pressure mixed working medium can recover medium-pressure hydrophobic medium and medium-pressure CO in the same way 2 And (4) residual heat of the gas. The invention comprises high, medium and low pressure feed water heaters, a gas-liquid separator and an auxiliary pipeline, and can realize CO 2 The gas waste heat is recycled in a gradient manner and the drainage is recycled, so that the water supplementing quantity of the system and the consumption of the mixed working medium extracted by the steam turbine are reduced, and the energy-saving effect is obvious.
Description
Technical Field
The invention relates to the technical field of power generation equipment, in particular to a recycling device and a recycling method for mixed working media of a water supply heating system.
Background
The energy maintains a mode of mainly using coal and supplying other energy forms as auxiliary supplies for a long time; the extensive type of coal utilization results in a lower energy utilization efficiency. The supercritical water coal gasification power generation technology utilizes supercritical water as a reaction medium, can realize that the processes of thermal decomposition, gasification, separation and purification and the like of coal are carried out in the same volume, and generates supercritical water and CO after the coal is completely gasified 2 And H 2 And mixing the working media. Separating hydrogen after coal gasification reaction to obtain supercritical water steam and CO 2 And mixing the working media, and then feeding the mixed working media into a steam turbine to perform heat-power conversion power generation.
To liftThe heat economy of the high supercritical water coal gasification power generation technology is realized by adopting a feed water heating method in a steam power cycle to reduce the heat exchange temperature difference between the boiler flue gas and water; the specific method comprises the following steps: extracting partially worked supercritical water vapor/CO from a steam turbine 2 The mixed working medium releases heat in the feed water heater to heat the feed water, reduces the heat absorption of low-temperature water in the liquid region, improves the average heat absorption temperature of the water and increases the heat efficiency of the supercritical water coal gasification power generation cycle. After heat release in feedwater heaters 2 The water vapor in the mixed working medium is condensed into liquid water, and the mixed working medium is converted into a gas-liquid two-phase mixed working medium.
At present, in the prior art, a mixed working medium discharged from a feed water heating system is directly conveyed into a condenser of a power generation system, and CO is separated from the mixed working medium in the condenser in a suction mode 2 Gases, which present the following problems:
(1) the gas-liquid two-phase mixed working medium after the temperature of the water supply heating system is reduced still has higher temperature, and the part of waste heat is not recycled;
(2) condenser suction CO separation 2 A large amount of water vapor is lost in the gas process, so that a large amount of water is needed for the supercritical water coal gasification power generation cycle.
In conclusion, if the mixed working medium after the temperature of the water supply heating system is reduced can be efficiently recycled, the production cost can be effectively saved, and the economic benefit is improved.
Disclosure of Invention
The invention aims to provide a recycling device and a recycling method for mixed working media of a feedwater heating system, so as to solve one or more technical problems. The device can recycle the drainage of the feed water heating system and realize CO 2 The gas waste heat is recycled in a gradient way, the steam extraction amount and the water supplement amount of the mixed working medium of the generator set can be reduced, the production cost is effectively saved, and the existing waste of water resources and CO can be solved 2 The technical problem of gas waste heat.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a recycling device for mixed working medium of a feed water heating system, which comprises:
the high-pressure heater is provided with a water inlet, a water outlet, a working medium inlet and a working medium outlet; the working medium inlet of the high-pressure heater is used for obtaining high-pressure mixed working medium from the high-pressure cylinder of the supercritical water coal gasification turbine;
the medium-pressure heater is provided with a water inlet, a water outlet, a first working medium inlet and a working medium outlet; the first working medium inlet of the medium-pressure heater is used for obtaining medium-pressure mixed working medium from a supercritical water coal gasification turbine medium-pressure cylinder, and the water outlet of the medium-pressure heater is communicated with the water inlet of the high-pressure heater;
the low-pressure heater is provided with a water inlet, a water outlet, a first working medium inlet and a working medium outlet; the first working medium inlet of the low-pressure heater is used for obtaining low-pressure mixed working medium from a low-pressure cylinder of the supercritical water coal gasification turbine, the water outlet of the low-pressure heater is communicated with the water inlet of the medium-pressure heater, and the water inlet of the low-pressure heater is used for introducing condensed water;
the high-pressure separator is provided with a working medium inlet, a gas outlet and a liquid outlet; an inlet of the high-pressure separator is communicated with a working medium outlet of the high-pressure heater, and a liquid outlet of the high-pressure separator is communicated with a water outlet of the high-pressure heater;
the medium-pressure separator is provided with a working medium inlet, a gas outlet and a liquid outlet; an inlet of the medium-pressure separator is communicated with a working medium outlet of the medium-pressure heater, and a liquid outlet of the medium-pressure separator is communicated with a water outlet of the medium-pressure heater;
the low-pressure separator is provided with a working medium inlet, a gas outlet and a liquid outlet; and the inlet of the low-pressure separator is communicated with the working medium outlet of the low-pressure heater, and the liquid outlet of the low-pressure separator is communicated with the water outlet of the low-pressure heater.
The invention is further improved in that the medium-pressure heater is provided with a second working medium inlet; and a gas outlet of the high-pressure separator is communicated with a second working medium inlet of the medium-pressure heater.
The invention is further improved in that the low-pressure heater is provided with a second working medium inlet; and a gas outlet of the medium-pressure separator is communicated with a second working medium inlet of the low-pressure heater.
The invention further improves the method and also comprises the following steps: and the inlet of the gas collecting device is communicated with the gas outlet of the low-pressure separator.
The invention is further improved in that the high-pressure mixed working medium, the medium-pressure mixed working medium and the low-pressure mixed working medium all comprise CO 2 Mixed working medium of gas and steam.
The invention further improves the method and also comprises the following steps: and the inlet of the gas collecting device is communicated with the gas outlets of the high-pressure separator, the medium-pressure separator and the low-pressure separator.
The invention relates to a recycling method of mixed working medium of a feedwater heating system, which is based on the device of the invention and comprises the following steps:
the condensed water is sequentially conveyed to a high-pressure heater, a medium-pressure heater and a low-pressure heater of a water supply heating system; respectively extracting part of high-pressure mixed working medium, medium-pressure mixed working medium and low-pressure mixed working medium from a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder of the supercritical water coal gasification turbine; respectively introducing the high-pressure mixed working medium, the medium-pressure mixed working medium and the low-pressure mixed working medium into a high-pressure heater, a medium-pressure heater and a low-pressure heater;
the mixed working medium exchanges heat with condensed water in the heater, and water vapor in the mixed working medium is condensed into liquid water;
CO 2 separating the gas-liquid mixture of gas and liquid water in a separator, discharging the hydrophobic water formed by the liquid water from the liquid outlet of the separator, and discharging CO 2 The gas is discharged from the gas outlet of the separator.
The invention further improves the method and also comprises the following steps: CO discharged from the high-pressure separator 2 The gas is input into a medium-pressure heater for continuous heat exchange.
The invention further providesThe step improvement lies in, still includes: CO discharged from the medium-pressure separator 2 And the gas is input into a low-pressure heater for continuous heat exchange.
Compared with the prior art, the invention has the following beneficial effects:
the device can recycle the drainage of the feed water heating system and realize CO 2 The gas waste heat is recycled in a gradient manner, so that the steam extraction amount and the water supplement amount of the mixed working medium of the generator set can be reduced, and the production cost is effectively saved; wherein CO can be recovered according to the energy cascade utilization principle 2 Sensible heat of the gas is reduced, the steam extraction capacity of the steam turbine is reduced, the work doing capacity of the steam turbine is increased, and the energy-saving effect is obvious; on the other hand, as the gas-liquid separator is arranged, most of the drained water generated by the heater can be input into the system again for recycling, so that the water supplementing amount of the power generation system can be reduced, and the production cost can be effectively saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a mixed working medium recycling device of a feedwater heating system according to an embodiment of the present invention;
in fig. 1, a high-pressure mixed working medium inlet pipe; 2. a medium-pressure mixed working medium air inlet pipe; 3. a low-pressure mixed working medium air inlet pipe; 4. a water outlet pipe of the high-pressure heater; 5. a high pressure heater; 6. a high pressure heater water inlet pipe; 7. a medium pressure heater; 8. a water inlet pipe of the medium-pressure heater; 9. a low pressure heater; 10. a low pressure heater water inlet pipe; 11. a high pressure separator drain pipe; 12. a high pressure separator inlet tube; 13. a high pressure separator; 14. a high pressure separator vent pipe; 15. a medium pressure separator drain; 16. an intermediate pressure separator inlet tube; 17. a medium pressure separator; 18. a medium pressure separator vent pipe; 19. a low pressure separator drain; 20. a low pressure separator inlet pipe; 21. a low pressure separator; 22. a low pressure separator vent line.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1, a recycling device for mixed working medium of a feedwater heating system according to an embodiment of the present invention includes: the device comprises a high-pressure mixed working medium inlet pipe 1, a medium-pressure mixed working medium inlet pipe 2, a low-pressure mixed working medium inlet pipe 3, a high-pressure heater outlet pipe 4, a high-pressure heater 5, a high-pressure heater inlet pipe 6, a medium-pressure heater 7, a medium-pressure heater inlet pipe 8, a low-pressure heater 9, a low-pressure heater inlet pipe 10, a high-pressure separator drain pipe 11, a high-pressure separator inlet pipe 12, a high-pressure separator 13, a high-pressure separator exhaust pipe 14, a medium-pressure separator drain pipe 15, a medium-pressure separator inlet pipe 16, a medium-pressure separator 17, a medium-pressure separator exhaust pipe 18, a low-pressure separator drain pipe 19, a low-pressure separator inlet pipe 20, a low-pressure separator 21 and a low-pressure separator exhaust pipe 22.
The high-pressure mixed working medium air inlet pipe 1, the medium-pressure mixed working medium air inlet pipe 2 and the low-pressure mixed working medium air inlet pipe 3 are respectively communicated with upper end inlets of a high-pressure heater 5, a medium-pressure heater 7 and a low-pressure heater 9; a low-pressure heater water inlet pipe 10, a low-pressure heater 9, a medium-pressure heater water inlet pipe 8, a medium-pressure heater 7, a high-pressure heater water inlet pipe 6, a high-pressure heater 5 and a high-pressure heater water outlet pipe 4 are sequentially communicated from right to left; the high-pressure separator inlet pipe 12 is connected with the lower end outlet of the high-pressure heater 5 and the left end inlet of the high-pressure separator 13, the high-pressure separator drain pipe 11 is connected with the lower end drain outlet of the high-pressure separator 13 and the high-pressure heater outlet pipe 4, the other end of the high-pressure heater outlet pipe 4 is communicated with an external supercritical water gasification furnace, and the high-pressure separator exhaust pipe 14 is connected with the gas outlet at the upper end of the high-pressure separator 13 and the gas inlet at the left end of the high-pressure separator 13The lower end of the medium-pressure heater 7 is provided with an air inlet; an inlet pipe 16 of the medium-pressure separator is connected with an outlet at the lower end of the medium-pressure heater 7 and an inlet at the left end of the medium-pressure separator 17, a drain pipe 15 of the medium-pressure separator is connected with a drain outlet at the lower end of the medium-pressure separator 17 and a water outlet pipe 6 of the medium-pressure heater, and an exhaust pipe 18 of the medium-pressure separator is connected with a gas outlet at the upper end of the medium-pressure separator 17 and a gas inlet at the lower end of the low-pressure heater 9; the inlet pipe 20 of the low-pressure separator is connected with the outlet at the lower end of the low-pressure heater 9 and the inlet at the left end of the low-pressure separator 21, the drain pipe 19 of the low-pressure separator is connected with the drain outlet at the lower end of the low-pressure separator 21 and the water outlet pipe 8 of the low-pressure heater, and the exhaust pipe 22 of the low-pressure separator is connected with the external CO 2 And a gas collecting device.
According to the device provided by the embodiment of the invention, according to the energy cascade utilization principle, high, medium and low pressure heaters are arranged aiming at three mixed working media with different pressure grades (0.5-1.5 MPa, 1.5-5 MPa and 5-15 MPa), and after the mixed working media respectively heat water supply in a water inlet pipe, water vapor components are condensed into liquid hydrophobic substances and are mixed with non-condensable CO to form a hydrophobic liquid 2 The gas forms a gas-liquid two-phase mixture; the high-pressure separator, the medium-pressure separator and the low-pressure separator are arranged, so that the deep separation of gas-liquid mixtures with different pressure grades is realized, the separation efficiency is improved, and 85 to 90 percent of non-condensable CO in hydrophobic water can be removed 2 A gas; the structure that the drain pipe is connected with the external condenser is improved, the drain pipe of the separator in the device is directly communicated with the water inlet pipe of the heater, and the condensate drain pressure is utilized to convey drain to the system, so that the length of the pipeline is greatly shortened, the drain recycling is realized, the water supplement amount of a power generation system is reduced, and the production cost can be effectively saved. On the other hand, the device is provided with separator exhaust pipes among the high-pressure separator, the medium-pressure heater, the medium-pressure separator and the low-pressure heater, and utilizes the gas exhausted by the separator to heat the inlet water of the medium-pressure regenerator and the inlet water of the low-pressure regenerator respectively so as to realize non-condensable CO 2 The waste heat of the gas is utilized in a cascade way, and CO can be recovered 2 The sensible heat of the gas reduces the steam extraction quantity of the steam turbine, increases the work-doing capacity of the steam turbine and has obvious energy-saving effect.
The recycling method of the mixed working medium of the feedwater heating system of the embodiment of the invention comprises the following steps:
delivering the condensed water to the feed waterIn the heat exchanger of the heating system, the heat exchanger of the feed water heating system comprises a high-pressure heater, a medium-pressure heater and a low-pressure heater, wherein part of mixed working media are respectively extracted from a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder of the steam turbine, and the mixed working media comprise CO 2 Gas and steam, high-pressure mixed working medium, medium-pressure mixed working medium and low-pressure mixed working medium are respectively introduced into the high-pressure heater, the medium-pressure heater and the low-pressure heater, the mixed working medium with higher temperature exchanges heat with the condensed water with lower temperature in each heater, and the steam in the mixed working medium is condensed into liquid water and CO after cooling 2 Separating gas-liquid mixture of gas and liquid water in a separator, discharging hydrophobic water formed by the liquid water from an outlet at the lower end of the separator into a water outlet pipe of a heater, and discharging CO 2 The gas is discharged from an outlet at the upper end of the separator. High pressure CO from high pressure separator 2 The gas flows into the medium-pressure heater to continuously exchange heat, and medium-pressure CO is discharged from the medium-pressure separator 2 The gas flows into the low-pressure heater to continuously exchange heat, and the low-pressure CO discharged by the low-pressure separator 2 The gas is discharged directly into the atmosphere.
According to the technical scheme of the embodiment of the invention, liquid water and CO in the feedwater heating system are mixed 2 Separated by a separator, the drained water is conveyed to a system for recycling, and CO is treated 2 The gas waste heat is utilized in a cascade way, and high-pressure and medium-pressure CO are fully recovered 2 The residual heat of the gas.
In summary, the invention discloses a method and a device for recycling mixed working medium of a feed water heating system, wherein high-pressure mixed working medium obtained after a high-pressure feed water heater is cooled is subjected to a gas-liquid separator to obtain high-pressure CO 2 Gas and high-pressure drainage are carried out, the high-pressure drainage automatically flows into a water outlet pipe of the high-pressure heater by utilizing pressure difference, drainage recycling is realized, and high-pressure CO is recycled 2 The water supply of the gas heating medium-pressure water supply heater realizes CO 2 And recycling the waste heat of the gas. The cooled medium-pressure mixed working medium can recover medium-pressure hydrophobic medium and medium-pressure CO in the same way 2 And (4) residual heat of the gas. The invention comprises high, medium and low pressure feed water heaters, a gas-liquid separator and an auxiliary pipeline, and can realize CO 2 Gas waste heat gradient recycling and drainage circulationThe utilization of the mixed working medium reduces the water supplement amount of the system and the consumption of the mixed working medium extracted by the steam turbine, and the energy-saving effect is obvious.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (6)
1. The utility model provides a recycle device of feedwater heating system mixing medium which characterized in that includes:
the high-pressure heater (5), the said high-pressure heater (5) has water inlet, water outlet, working medium inlet, working medium outlet; a working medium inlet of the high-pressure heater (5) is used for obtaining high-pressure mixed working medium from a high-pressure cylinder of the supercritical water coal gasification turbine;
the medium-pressure heater (7), the said medium-pressure heater (7) has water inlet, water outlet, first working medium inlet, working medium outlet; a first working medium inlet of the medium-pressure heater (7) is used for obtaining medium-pressure mixed working medium from a supercritical water coal gasification turbine intermediate-pressure cylinder, and a water outlet of the medium-pressure heater (7) is communicated with a water inlet of the high-pressure heater (5);
the low-pressure heater (9), the said low-pressure heater (9) has water inlet, water outlet, first working medium inlet, working medium outlet; a first working medium inlet of the low-pressure heater (9) is used for obtaining a low-pressure mixed working medium from a low-pressure cylinder of the supercritical water coal gasification turbine, a water outlet of the low-pressure heater (9) is communicated with a water inlet of the medium-pressure heater (7), and a water inlet of the low-pressure heater (9) is used for introducing condensed water;
a high pressure separator (13), the high pressure separator (13) being provided with an inlet, a gas outlet and a liquid outlet; an inlet of the high-pressure separator (13) is communicated with a working medium outlet of the high-pressure heater (5), and a liquid outlet of the high-pressure separator (13) is communicated with a water outlet of the high-pressure heater (5);
a medium pressure separator (17), the medium pressure separator (17) being provided with an inlet, a gas outlet and a liquid outlet; an inlet of the medium-pressure separator (17) is communicated with a working medium outlet of the medium-pressure heater (7), and a liquid outlet of the medium-pressure separator (17) is communicated with a water outlet of the medium-pressure heater (7);
a low pressure separator (21), the low pressure separator (21) being provided with an inlet, a gas outlet and a liquid outlet; an inlet of the low-pressure separator (21) is communicated with a working medium outlet of the low-pressure heater (9), and a liquid outlet of the low-pressure separator (21) is communicated with a water outlet of the low-pressure heater (9);
a gas collection device, the inlet of which is in communication with the gas outlet of the low pressure separator (21);
the medium-pressure heater (7) is provided with a second working medium inlet; the gas outlet of the high-pressure separator (13) is communicated with the second working medium inlet of the medium-pressure heater (7); the low-pressure heater (9) is provided with a second working medium inlet; and a gas outlet of the medium-pressure separator (17) is communicated with a second working medium inlet of the low-pressure heater (9).
2. The recycling device of the mixed working medium of the feedwater heating system of claim 1, wherein the high-pressure mixed working medium, the medium-pressure mixed working medium and the low-pressure mixed working medium all comprise CO 2 Mixed working medium of gas and steam.
3. The recycling device of the mixed working medium of the feedwater heating system of claim 1, further comprising:
and the inlet of the gas collecting device is communicated with the gas outlets of the high-pressure separator (13), the medium-pressure separator (17) and the low-pressure separator (21).
4. A recycling method of mixed working media of a feedwater heating system is characterized in that the device based on claim 1 comprises the following steps:
the condensed water is sequentially conveyed to a high-pressure heater (5), a medium-pressure heater (7) and a low-pressure heater (9) of a water supply heating system; respectively extracting part of high-pressure mixed working medium, medium-pressure mixed working medium and low-pressure mixed working medium from a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder of the supercritical water coal gasification turbine; respectively introducing the high-pressure mixed working medium, the medium-pressure mixed working medium and the low-pressure mixed working medium into a high-pressure heater (5), a medium-pressure heater (7) and a low-pressure heater (9);
the mixed working medium exchanges heat with condensed water in the heater, and water vapor in the mixed working medium is condensed into liquid water;
CO 2 separating the gas-liquid mixture of gas and liquid water in a separator, discharging the hydrophobic water formed by the liquid water from the liquid outlet of the separator, and discharging CO 2 The gas is discharged from the gas outlet of the separator.
5. The recycling method of the mixed working medium of the feedwater heating system of claim 4, further comprising:
CO discharged from the high-pressure separator (13) 2 The gas is input into a medium-pressure heater (7) to continue heat exchange.
6. The recycling method of the mixed working medium of the feedwater heating system of claim 4, further comprising: CO discharged from the medium-pressure separator (17) 2 The gas is input into a low-pressure heater (9) to continue heat exchange.
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| CN115155219B (en) * | 2022-08-22 | 2023-09-08 | 浙江洛森压缩机股份有限公司 | Gas-liquid separation sewage disposal system |
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