CN114034138A - System and method for improving summer operation backpressure of indirect air cooling unit - Google Patents
System and method for improving summer operation backpressure of indirect air cooling unit Download PDFInfo
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- CN114034138A CN114034138A CN202111335536.5A CN202111335536A CN114034138A CN 114034138 A CN114034138 A CN 114034138A CN 202111335536 A CN202111335536 A CN 202111335536A CN 114034138 A CN114034138 A CN 114034138A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B37/00—Absorbers; Adsorbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
Abstract
The invention discloses a system and a method for improving summer running backpressure of an indirect air cooling unit, which comprises a steam turbine unit, an air cooling island, a power circulation unit and a refrigeration circulation unit, wherein exhaust steam of a steam turbine of the unit is led to enter an evaporator for heat release, and a composite circulation system is driven by exhaust waste heat, so that the effective cascade utilization of the exhaust waste heat of the steam turbine is realized, and the overall energy utilization efficiency of the system is improved. The steam turbine exhaust drives power circulation, the external power supply amount of the system is increased, and the power supply capacity of the system is improved. Meanwhile, the exhaust steam of the steam turbine firstly enters the evaporator for preliminary cooling and then enters the condenser, so that the heat load entering the condenser is reduced. The refrigeration capacity prepared by the composite circulation cools the circulating water at the inlet of the condenser, and the temperature of the circulating water at the inlet of the condenser is reduced. When the ambient air temperature is higher in summer, the heat exchange effect of the condenser can be obviously improved, the running backpressure of the unit is improved, the running efficiency and the safety of the steam turbine unit are improved, and the problems of large heat loss and low running efficiency of the indirect air cooling unit in summer running exhaust steam are solved.
Description
Technical Field
The invention belongs to the technical field of waste heat recovery, and relates to a system and a method for improving summer running backpressure of an indirect air cooling unit.
Background
In some regions, because of the relative scarcity of water resources, the coal-fired unit usually adopts an air cooling mode to cool the exhausted steam or the circulating water of the unit. Because the cooling system is in closed circulation, the water consumption is almost zero, and the consumption of water resources by the coal-fired power plant is greatly reduced. But simultaneously, the problem of higher unit design and operation backpressure is brought, and the unit exhaust steam and heat loss are huge, and the operation efficiency of the unit is influenced. Especially in summer operation condition, the unit operation backpressure can even reach 35 ~ 40kPa, and the high operating efficiency that has reduced the unit of backpressure on the one hand, and on the other hand has also brought great hidden danger for the safe operation of unit.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a system and a method for improving the summer operation backpressure of an indirect air cooling unit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a system for improving summer running backpressure of an indirect air cooling unit comprises a turbine unit, a condenser, a condensing unit, a first evaporator, a turbine, a heat exchange unit, a condenser, a second evaporator and an absorber;
the exhaust steam of the steam turbine set is divided into two paths, one path of the exhaust steam enters a condenser for cooling and condensing, and then condensed water produced enters a condensed water system, and circulating water absorbing heat in the condenser enters a condensing unit for heat exchange; in the condensation unit, circulating water after heat exchange is divided into two paths, wherein one path of circulating water returns to the condenser, and the other path of circulating water enters the second evaporator; the other path of exhaust steam of the turbine unit enters a first evaporator, exchanges heat with a working medium in the first evaporator and then enters a condenser, and the working medium absorbs heat to generate superheated steam and then enters a turbine;
the dead steam generated by the turbine firstly enters a heat exchange unit for heat exchange and then enters a condenser for condensation through the heat exchange unit, one part of generated condensed working medium returns to the first evaporator, and the other part of generated condensed working medium enters the second evaporator for heat exchange; in the second evaporator, circulating water after heat exchange returns to the condenser, working medium steam generated by condensing working medium heat exchange enters the absorber, and solution in the absorber absorbs the working medium steam and then enters the heat exchange unit for heat exchange; in the heat exchange unit, the solution after heat exchange returns to the absorber, and the working medium steam separated out by the heat exchange of the solution enters the condenser for condensation.
The invention is further improved in that:
the heat exchange unit comprises a generator and a solution heat exchanger;
the dead steam generated by the turbine sequentially enters the generator and the solution heat exchanger for heat exchange, and then enters the condenser for condensation;
the solution in the absorber sequentially enters the solution heat exchanger and the generator for heat exchange, the solution after heat exchange in the generator returns to the absorber through the solution heat exchanger, and the working medium steam separated out by the solution heat exchange enters the condenser through the solution heat exchanger.
A working medium pump is arranged between the condensing working medium outlet of the condenser and the condensing working medium inlet of the first evaporator; a first throttle valve is arranged between the condensing working medium outlet of the condenser and the condensing working medium inlet of the second evaporator.
And a solution pump is arranged between the solution outlet of the generator and the solution inlet of the solution heat exchanger.
And a second throttling valve is arranged between the solution outlet of the solution heat exchanger and the solution inlet of the generator.
Be provided with first valve between the steam extraction export of turboset and the steam inlet of first evaporimeter, be provided with the second valve between the steam extraction export of first evaporimeter and the steam inlet of condenser, be provided with the third valve between the steam extraction export of turboset and the steam inlet of condenser.
And a circulating water pump is arranged between the circulating water outlet of the condenser and the circulating water inlet of the condensing unit, and a sixth valve is arranged between the circulating water outlet of the condensing unit and the circulating water inlet of the condenser.
A fourth valve is arranged between the circulating water outlet of the second evaporator and the circulating water inlet of the condensing unit; and a fifth valve is arranged between the circulating water inlet of the second evaporator and the circulating water outlet of the condensing unit.
And a compressor is arranged between the heat release working medium steam outlet of the second evaporator and the working medium steam inlet of the absorber.
A method for improving summer operation backpressure of an indirect air cooling unit comprises the following steps:
one path of exhaust steam of the steam turbine set is conveyed to a condenser, the exhaust steam is cooled and condensed by circulating water in the condenser, generated condensed water is conveyed to a condensed water system, the circulating water after heat absorption is conveyed to a condensing unit to exchange heat with air, one path of the circulating water after heat exchange is conveyed to the condenser, and the other path of the circulating water after heat exchange is conveyed to a second evaporator;
the other path of exhaust steam of the turboset is conveyed to a first evaporator to exchange heat with a working medium in the first evaporator, the steam after heat exchange and temperature reduction is conveyed to a condenser, superheated steam generated by the heat of the steam absorbed by the working medium is conveyed to a turbine, and the superheated steam expands in the turbine to act to drive a generator to generate electricity;
the dead steam generated by the turbine is sequentially conveyed to the generator and the solution heat exchanger for heat release and then conveyed to the condenser for condensation, one part of generated condensed working medium is conveyed to the first evaporator to complete power circulation, and the other part of the generated condensed working medium is conveyed to the second evaporator;
and (2) conveying the circulating water subjected to heat exchange in the second evaporator to a condenser, conveying working medium steam generated by condensing the working medium for heat exchange to an absorber, sequentially conveying the solution in the absorber after absorbing hot steam to a solution heat exchanger and a generator for heat exchange, heating the solution in the generator after absorbing the exhaust steam heat generated by the turbine, allowing the heated solution to flow into the absorber through the solution heat exchanger, conveying the working medium steam separated by heating the solution to the condenser through the solution heat exchanger for heat release and condensation, and realizing refrigeration type circulation.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a system for improving summer running back pressure of an indirect air cooling unit, which comprises a steam turbine unit, a condenser, a condensing unit, a first evaporator, a turbine, a heat exchange unit, a condenser, a second evaporator and an absorber, wherein the exhaust steam of the steam turbine unit is divided into two paths, one path of the exhaust steam enters the condenser for cooling and condensing to generate condensed water, and the condensed water enters a condensed water system, and the circulating water after absorbing heat enters the condensing unit for heat exchange; in the condensation unit, circulating water after heat exchange is divided into two paths, wherein one path of circulating water returns to the condenser, and the other path of circulating water enters the second evaporator; the other path of exhaust steam of the turbine unit enters a first evaporator to exchange heat with a working medium in the first evaporator, the steam after heat exchange enters a condenser, and the working medium steam enters a turbine; dead steam generated by the turbine firstly enters a heat exchange unit for heat exchange, then enters a condenser for condensation through the heat exchange unit, and a part of generated condensed working medium returns to the first evaporator and the other part of the generated condensed working medium enters the second evaporator for heat exchange; in the second evaporator, circulating water after heat exchange returns to the condenser, working medium steam generated by condensing working medium heat exchange enters the absorber, and solution in the absorber absorbs the working medium steam and then enters the heat exchange unit for heat exchange; in the heat exchange unit, the solution after heat exchange returns to the absorber, and the steam separated out by heat exchange enters the condenser for condensation. The exhaust steam of the turbine unit enters the first evaporator to release heat, and the exhaust waste heat is utilized to drive the composite circulating system, so that the effective cascade utilization of the exhaust waste heat of the turbine is realized, and the overall energy utilization efficiency of the system is improved. The steam turbine exhaust drives power circulation, the external power supply amount of the system is increased, and the power supply capacity of the system is improved. Meanwhile, the exhaust steam of the steam turbine firstly enters the first evaporator for preliminary cooling and then enters the condenser, so that the heat load entering the condenser is reduced. The refrigeration capacity prepared by the composite circulation cools the circulating water at the inlet of the condenser, and the temperature of the circulating water at the inlet of the condenser is reduced. When the ambient air temperature is higher in summer, the heat exchange effect of the condenser can be obviously improved, the running backpressure of the turbine unit is improved, and the running efficiency and the safety of the turbine unit are improved.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein: the system comprises a steam turbine unit 1, a condenser 2, an air cooling tower 3, a circulating water pump 4, a first evaporator 5, a turbine 6, a generator 7, a solution heat exchanger 8, a condenser 9, a working medium pump 10, a first throttling valve 11, a second evaporator 12, a compressor 13, an absorber 14, a solution pump 15, a second throttling valve 16, a first valve 17, a second valve 18, a third valve 19, a fourth valve 20, a fifth valve 21 and a sixth valve 22.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Among the low-temperature waste heat utilization technologies, the Organic Rankine Cycle (ORC) technology is favored because of its advantages such as simple structure, high stability, high power generation efficiency, and low sealing requirements. The ORC system adopts low-boiling point organic matters such as halogenated hydrocarbon or hydrocarbon and the like as Rankine cycle of working media, can effectively utilize various low-grade heat energy, and has wide application prospect in the field of low-temperature waste heat utilization.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the invention discloses a system for improving summer operation backpressure of an indirect air cooling unit, which comprises a turbine unit 1, a condenser 2, a condensing unit, a first evaporator 5, a turbine 6, a heat exchange unit, a condenser 9, a second evaporator 12 and an absorber 14; the exhaust steam of the steam turbine unit 1 is divided into two paths, one path of exhaust steam enters the condenser 2 for cooling and condensation to generate condensed water, the condensed water enters a condensed water system, and circulating water absorbing heat in the condenser 2 enters a condensing unit for heat exchange; in the condensation unit, circulating water after heat exchange is divided into two paths, wherein one path of circulating water returns to the condenser 2, and the other path of circulating water enters the second evaporator 12; the other path of exhaust steam of the turbine unit 1 enters a first evaporator 5, exchanges heat with a working medium in the first evaporator 5 and then enters a condenser 2, and the working medium absorbs heat to generate superheated steam and then enters a turbine 6;
the exhaust steam generated by the turbine 6 firstly enters a heat exchange unit for heat exchange, then enters a condenser 9 for condensation through the heat exchange unit, one part of the generated condensed working medium returns to the first evaporator 5, and the other part of the generated condensed working medium enters the second evaporator 12 for heat exchange; in the second evaporator 12, condensed water after heat exchange returns to the condenser 2, working medium steam generated by heat exchange of a condensed working medium enters the absorber 14, and solution in the absorber 14 enters the heat exchange unit for heat exchange after absorbing the working medium steam; in the heat exchange unit, the solution after heat exchange returns to the absorber 14, and the steam separated by heat exchange enters the condenser 9 for condensation.
The heat exchange unit comprises a generator 7 and a solution heat exchanger 8; the exhaust steam generated by the turbine 6 enters the generator 7 and the solution heat exchanger 8 in sequence for heat exchange, and then enters the condenser 9 for condensation; the solution in the absorber 14 sequentially enters the solution heat exchanger 8 and the generator 7 for heat exchange, the solution after heat exchange in the generator 7 returns to the absorber 14 through the solution heat exchanger 8, and the working medium steam separated out by the solution heat exchange enters the condenser 9. A solution pump 15 is provided between the solution outlet of the generator 14 and the solution inlet of the solution heat exchanger 8. A second throttle valve 16 is arranged between the solution outlet of the solution heat exchanger 8 and the solution inlet of the generator 14. A first valve 17 is arranged between the steam outlet of the steam turbine unit 1 and the steam inlet of the first evaporator 5, a second valve 18 is arranged between the steam outlet of the first evaporator 5 and the steam inlet of the condenser 2, and a third valve 19 is arranged between the steam outlet of the steam turbine unit 1 and the steam inlet of the condenser 2. A circulating water pump 4 is arranged between the exhaust steam outlet of the condenser 2 and the steam inlet of the condensing unit, and a sixth valve 22 is arranged between the circulating water outlet of the condensing unit and the circulating water inlet of the condenser 2. A working medium pump 10 is arranged between the condensing working medium outlet of the condenser 9 and the condensing working medium inlet of the first evaporator 5; a first throttle valve 11 is arranged between the condensed working medium outlet of the condenser 9 and the condensed working medium inlet of the second evaporator 12. A fifth valve 21 is arranged between the circulating water inlet of the second evaporator 12 and the circulating water outlet of the condensing unit. A compressor 13 is arranged between the working medium steam outlet of the second evaporator and the working medium steam inlet of the absorber 14. A fourth valve 20 is arranged between the circulating water outlet of the second evaporator 12 and the circulating water inlet of the condenser 2. The condensing unit comprises an air cooling island 3.
The invention also discloses a method for improving the summer operation backpressure of the indirect air cooling unit, which specifically comprises the following steps:
the steam outlet of the steam turbine unit 1 is connected with the inlet of the condenser 2, and the exhaust steam entering the condenser 2 is cooled by circulating water and then condensed to enter a unit condensed water system. Circulating water after absorbing exhaust heat and rising temperature enters the air cooling tower 3 after being boosted by the circulating water pump 4, exchanges heat with ambient air and lowers the temperature, and then returns to the condenser 2 again.
The steam outlet of the steam turbine set 1 is connected with the inlet of the first evaporator 5, the exhaust steam entering the first evaporator 5 firstly transfers part of heat to the organic working medium in the first evaporator 5 for preliminary cooling, and then enters the condenser 2.
The first evaporator 5, the turbine 6, the generator 7, the solution heat exchanger 8, the condenser 9 and the working medium pump 10 form a power circulation unit, and the specific working steps of the power circulation unit are as follows:
the organic working medium absorbs the heat of the steam exhausted by the steam turbine set 1 in the first evaporator 5 to become superheated steam, then the superheated steam enters the turbine 6 to expand and do work to drive the generator to generate electricity, the dead steam of the turbine 6 sequentially enters the generator 7 and the solution heat exchanger 8 to release heat, then the dead steam enters the condenser 9 to be condensed, and part of the condensed working medium at the outlet of the condenser 9 is boosted by the working medium pump 10 and then returns to the first evaporator 5.
The generator 7, the solution heat exchanger 8, the condenser 9, the first throttling valve 11, the evaporator 12, the compressor 13, the absorber 14, the solution pump 15 and the second throttling valve 16 form a refrigeration cycle unit, and the refrigeration cycle unit comprises the following specific working steps:
the dilute solution at the outlet of the absorber 14 enters the solution heat exchanger 8 after being boosted by the solution pump 15, and exchanges heat with the concentrated solution and the working medium steam from the generator 7 for primary temperature rise, and then enters the generator 7, the waste heat of the exhaust steam of the absorption turbine 6 is further raised in temperature to separate out the working medium steam and convert the working medium steam into the concentrated solution, the concentrated solution returns to the solution heat exchanger 8 for heat release and then returns to the absorber 14 after being throttled by the second throttle valve 16, the separated working medium steam enters the condenser 9 for heat release and condensation, and then enters the evaporator 12 after being throttled by the first throttle valve 11 to absorb heat and convert the heat into steam again, and the steam returns to the absorber 14 after being pressurized by the compressor 13 and is absorbed by the solution.
The working medium steam separated out from the generator 7 is firstly introduced into the solution heat exchanger 8 for preliminary cooling and then enters the condenser 9 for condensation, so that the heat load of the condenser 9 is reduced.
Circulating water subjected to heat exchange and temperature reduction with ambient air enters the evaporator 12, exchanges heat with a working medium for temperature reduction, and then enters the condenser 2.
The power cycle and the refrigeration cycle adopt the same organic working medium.
Preferably, R1234ze and R1234yf are recommended to be selected as organic working substances, and ionic liquid [ HMIM ] [ Tf2N ] is recommended to be selected as absorbent solution.
When the summer ambient temperature is high and the unit back pressure is poor, the first valve 17, the second valve 18, the fourth valve 20 and the fifth valve 21 are opened, and the third valve 19 and the sixth valve 22 are closed. The exhaust steam of the turboset 1 firstly enters the first evaporator 5 to be primarily cooled and then enters the condenser 2 to be cooled and condensed by circulating water, so that the heat load entering the condenser is reduced. Meanwhile, circulating water at the outlet of the air cooling tower 3 firstly enters the evaporator 12 for cooling and then enters the condenser 2 for heat exchange, so that the temperature of circulating water at the inlet of the condenser 2 is reduced, and the heat exchange effect of the condenser 2 is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A system for improving summer running backpressure of an indirect air cooling unit is characterized by comprising a turbine unit (1), a condenser (2), a condensing unit, a first evaporator (5), a turbine (6), a heat exchange unit, a condenser (9), a second evaporator (12) and an absorber (14);
the exhaust steam of the steam turbine set (1) is divided into two paths, one path of the exhaust steam enters the condenser (2) to be cooled and condensed, condensed water generated after condensation enters a condensed water system, and circulating water absorbing heat in the condenser (2) enters a condensation unit to exchange heat; in the condensation unit, circulating water after heat exchange is divided into two paths, wherein one path of circulating water returns to the condenser (2), and the other path of circulating water enters the second evaporator (12); the other path of exhaust steam of the turbine unit (1) enters a first evaporator (5), exchanges heat with a working medium in the first evaporator (5) and then enters a condenser (2), and the working medium absorbs heat to generate superheated steam and then enters a turbine (6);
the exhaust steam generated by the turbine (6) firstly enters a heat exchange unit for heat exchange, then enters a condenser (9) for condensation through the heat exchange unit, one part of the generated condensed working medium returns to the first evaporator (5), and the other part of the generated condensed working medium enters the second evaporator (12) for heat exchange; in the second evaporator (12), circulating water after heat exchange returns to the condenser (2), working medium steam generated by condensing working medium heat exchange enters the absorber (14), and solution in the absorber (14) absorbs the working medium steam and then enters the heat exchange unit for heat exchange; in the heat exchange unit, the solution after heat exchange returns to the absorber (14), and the working medium steam separated out by the heat exchange of the solution enters the condenser (9) for condensation.
2. The system for improving the summer operation backpressure of the indirect air cooling unit as claimed in claim 1, wherein the heat exchange unit comprises a generator (7) and a solution heat exchanger (8);
the exhaust steam generated by the turbine (6) sequentially enters a generator (7) and a solution heat exchanger (8) for heat exchange, and then enters a condenser (9) for condensation;
the solution in the absorber (14) sequentially enters the solution heat exchanger (8) and the generator (7) for heat exchange, the solution after heat exchange in the generator (7) returns to the absorber (14) through the solution heat exchanger (8), and the working medium steam separated out by the solution heat exchange enters the condenser (9) through the solution heat exchanger (8).
3. The system for improving the summer running backpressure of the indirect air cooling unit as claimed in claim 2, wherein a working medium pump (10) is arranged between the condensing working medium outlet of the condenser (9) and the condensing working medium inlet of the first evaporator (5); a first throttle valve (11) is arranged between a condensing working medium outlet of the condenser (9) and a condensing working medium inlet of the second evaporator (12).
4. The system for improving the summer running back pressure of the indirect air cooling unit as claimed in claim 2, wherein a solution pump (15) is arranged between the solution outlet of the generator (14) and the solution inlet of the solution heat exchanger (8).
5. The system for improving the summer running backpressure of the indirect air cooling unit as claimed in claim 4, wherein a second throttle valve (16) is arranged between the solution outlet of the solution heat exchanger (8) and the solution inlet of the generator (14).
6. The system for improving the summer running backpressure of the indirect air cooling unit according to claim 5, wherein a first valve (17) is arranged between the steam exhaust outlet of the steam turbine unit (1) and the steam inlet of the first evaporator (5), a second valve (18) is arranged between the steam exhaust outlet of the first evaporator (5) and the steam inlet of the condenser (2), and a third valve (19) is arranged between the steam exhaust outlet of the steam turbine unit (1) and the steam inlet of the condenser (2).
7. The system for improving the summer running backpressure of the indirect air cooling unit according to claim 5, wherein a circulating water pump (4) is arranged between the circulating water outlet of the condenser (2) and the circulating water inlet of the condensing unit, and a sixth valve (22) is arranged between the circulating water outlet of the condensing unit and the circulating water inlet of the condenser (2).
8. The system for improving the summer operation backpressure of the indirect air cooling unit as claimed in claim 7, wherein a fourth valve (20) is arranged between the circulating water outlet of the second evaporator (12) and the circulating water inlet of the condensing unit; and a fifth valve (21) is arranged between the circulating water inlet of the second evaporator (12) and the circulating water outlet of the condensing unit.
9. A system for improving the summer operating back pressure of an indirect air cooling unit according to any one of claims 1 to 8, characterized in that a compressor (13) is arranged between the heat-releasing working medium steam outlet of the second evaporator (12) and the working medium steam inlet of the absorber (14).
10. The method for improving the summer operation backpressure of the indirect air cooling unit in the system according to claim 2, which is characterized by comprising the following steps:
one path of exhaust steam of the steam turbine set (1) is conveyed to a condenser (2), the exhaust steam is cooled and condensed by circulating water in the condenser (2), generated condensed water is conveyed to a condensed water system, the circulating water after heat absorption is conveyed to a condensing unit to exchange heat with air, one path of the circulating water after heat exchange is conveyed to the condenser (2), and the other path of the circulating water after heat exchange is conveyed to a second evaporator (12);
the other path of exhaust steam of the steam turbine set (1) is conveyed to a first evaporator (5) to exchange heat with a working medium in the first evaporator (5), the steam subjected to heat exchange and temperature reduction is conveyed to a condenser (2), superheated steam generated by the heat of the steam absorbed by the working medium is conveyed to a turbine (6), and the superheated steam is expanded in the turbine (6) to act to drive a generator to generate electricity;
exhaust steam generated by the turbine (6) is sequentially conveyed to the generator (7) and the solution heat exchanger (8) for heat release and then conveyed to the condenser (9) for condensation, one part of generated condensed working medium is conveyed to the first evaporator (5) to complete power circulation, and the other part of the generated condensed working medium is conveyed to the second evaporator (12);
circulating water subjected to heat exchange in the second evaporator (12) is conveyed to the condenser (2), working medium steam generated by condensing working medium heat exchange is conveyed to the absorber (14), solution which absorbs hot steam in the absorber (14) is sequentially conveyed to the solution heat exchanger (8) and the generator (7) for heat exchange, the solution absorbs exhaust steam heat generated by the turbine (6) in the generator (7) and then is heated, the heated solution flows into the absorber (14) through the solution heat exchanger (8), and working medium steam which is separated out by heating of the solution is conveyed to the condenser (9) through the solution heat exchanger (8) for heat release and condensation, so that refrigeration type circulation is realized.
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| CN202111335536.5A CN114034138A (en) | 2021-11-11 | 2021-11-11 | System and method for improving summer operation backpressure of indirect air cooling unit |
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| CN202111335536.5A CN114034138A (en) | 2021-11-11 | 2021-11-11 | System and method for improving summer operation backpressure of indirect air cooling unit |
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