CN110878710B - Thermal power plant exhaust steam waste heat regeneration power generation system and implementation method thereof - Google Patents
Thermal power plant exhaust steam waste heat regeneration power generation system and implementation method thereof Download PDFInfo
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- CN110878710B CN110878710B CN201911218959.1A CN201911218959A CN110878710B CN 110878710 B CN110878710 B CN 110878710B CN 201911218959 A CN201911218959 A CN 201911218959A CN 110878710 B CN110878710 B CN 110878710B
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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
- F01K19/00—Regenerating or otherwise treating steam exhausted from steam engine plant
- F01K19/02—Regenerating by compression
- F01K19/04—Regenerating by compression in combination with cooling or heating
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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
- F01K13/02—Controlling, e.g. stopping or starting
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Abstract
The invention discloses a thermal power plant exhaust steam waste heat regeneration power generation system and an implementation method thereof. The invention avoids the problem that a large amount of media is needed for transferring the waste steam waste heat of the thermal power plant, can recycle most or even all of the waste steam waste heat of the thermal power plant for regeneration and power generation, can greatly reduce energy waste, can save a large amount of fire coal, reduce emission, save water, protect the environment, can obviously improve the energy utilization efficiency and the power generation efficiency of the thermal power plant, and has obvious effects of energy conservation, emission reduction and efficiency improvement.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a novel thermal power plant exhaust steam waste heat regeneration power generation system and an implementation method thereof.
Background
Although power generation technologies such as photoelectricity, wind power, nuclear power and the like and various new energy technologies are rising, the power generation technology of a thermal power plant has a long development history and mature technology, is the current main power generation technology, and still dominates in China and even all over the world in the foreseeable future. However, the power generation efficiency of the existing thermal power generation technology is only forty percent, energy exceeding fifty percent is wasted, and energy conservation, emission reduction and efficiency improvement are problems and problems to be solved urgently in thermal power plants. At present, in order to save energy, reduce emission and increase efficiency, part of thermal power plants utilize exhaust steam waste heat for heating, but the investment can be basically recovered within 5 years, and the problem that heating equipment is idle exists in a non-heating period. However, more thermal power plants are remote in geographic environment and lack of heat load, and only exhaust steam waste heat can be discharged to the environment, so that great energy waste is caused, and even serious adverse effects are brought to the environment.
Therefore, the technical problems of insufficient utilization of waste steam waste heat, great energy waste and environmental pollution in the prior art exist.
Aiming at the problem of energy waste in the thermal power plant, the inventor provides a thermal power plant exhaust steam waste heat regeneration power generation system and an implementation method thereof.
In view of this, the present invention further provides a novel thermal power plant exhaust steam waste heat regeneration power generation system and an implementation method thereof.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a novel exhaust steam waste heat regeneration power generation system of a thermal power plant and an implementation method thereof. Most of the exhausted steam of the steam turbine is shunted, compressed and enthalpy-extracted and then recycled for regeneration and power generation, so that the technical problems of insufficient utilization of waste steam waste heat, great energy waste and environmental pollution in the prior art are solved.
In order to achieve the above object, a thermodynamic system and a power generation system of an existing thermal power plant are reserved, and the thermal power plant is transformed on the basis of a steam-water system of the existing thermal power plant, and according to one aspect of the invention, a novel exhaust steam waste heat regeneration power generation system of the thermal power plant is provided, which comprises: the system comprises a boiler, a steam turbine, a generator, a condenser, a condensate pump, a steam compressor, a steam-water mixed evaporator, a steam pump, a steam exhaust pipe, a first steam exhaust flow-dividing pipe, a second steam exhaust flow-dividing pipe, a first condensate pipe, a second condensate pipe, a first steam pipe, a second steam pipe, an overheated steam pipe, a water replenishing unit, a deaerator, a circulating water cooling system and a steam extraction pipe;
the steam turbine is connected with the generator through a hot steam pipe, the steam turbine is connected with a condenser through a steam exhaust pipe, the condenser is connected with a condensate pump through a first condensate pipe, the condensate pump is connected with a steam-water mixed evaporator through a second condensate pipe and a deaerator, the steam compressor is connected with the steam exhaust pipe through a first steam exhaust flow dividing pipe, the steam compressor is connected with the steam-water mixed evaporator through a second steam exhaust flow dividing pipe, the steam-water mixed evaporator is connected with a steam pump through a first steam pipe, the steam pump is connected with the boiler through a second steam pipe, the steam exhaust pipe is connected with the deaerator and the steam turbine, and the circulating water cooling system is connected with the condenser; the steam-water mixed evaporator is provided with a water inlet, a steam inlet and a steam outlet;
the steam turbine applies work under the pushing of the superheated steam output by the boiler to drive the generator to generate power and output exhaust steam at the same time;
one part of the steam discharged by the low-pressure cylinder of the steam turbine is sent to a condenser through a steam discharge pipe to be condensed into condensed water, and the condensed water is deoxidized through a first condensed water pipe, a condensed water pump, a second condensed water pipe and a deaerator and then sent to a water inlet of a steam-water mixed evaporator;
the other part of the steam turbine output steam is sent to a steam inlet of the steam-water mixed evaporator through a first steam exhaust shunt pipe, a steam compressor compression enthalpy extraction pipe and a second steam exhaust shunt pipe;
the steam at the steam inlet of the steam-water mixed evaporator mixes and evaporates the condensed water at the water inlet into mixed steam, the mixed steam is output from the steam outlet and then is sent to a boiler for heating through a first steam pipe, a steam pump and a second steam pipe;
the boiler heats the mixed steam to generate high-temperature high-pressure superheated steam, and the high-temperature high-pressure superheated steam is sent to the steam turbine to do work through the hot steam pipe to drive the generator to generate power and output exhaust steam at the same time;
the condenser condenses a small part of the exhaust steam from the exhaust pipe into condensed water;
the water supplementing unit is used for desalting supplemented raw water (supplemented water) and then sending the desalted water into the condenser;
the circulating cooling water system utilizes circulating cooling water to cool the condenser;
the deaerator deaerates the condensed water by using steam extracted by a steam turbine intermediate pressure cylinder.
As another aspect of the present invention, the implementation method of the new exhaust steam waste heat regeneration power generation system of the thermal power plant of the present invention includes:
(1) The steam turbine generates exhaust steam after doing work;
(2) The method comprises the following steps of (1) splitting exhaust steam into two parts, condensing a small part of the exhaust steam into condensed water in a condenser through a steam exhaust pipe of a steam turbine, and sending the condensed water into a water inlet of a steam-water mixed evaporator after deoxidizing through a first condensed water pipe, a condensed water pump, a second condensed water pipe and a deaerator in sequence; the other most of the discharged steam is sequentially subjected to flow division, compression and enthalpy extraction through the first discharged steam flow division pipe, the steam compressor and the second discharged steam flow division pipe to obtain compressed steam which is sent to a steam inlet of the steam-water mixed evaporator;
(3) In the steam-water mixed evaporator, the condensed water is evaporated into mixed steam by compressed steam, and then the mixed steam is sent to a boiler for heating;
(4) The mixed steam is sent to a boiler to be heated into high-temperature high-pressure superheated steam, and then is sent to a steam turbine to do work, so that a generator is driven to generate electricity.
The joint of the steam exhaust pipe and the first steam exhaust shunt pipe is provided with a steam exhaust shunt valve, and the steam exhaust shunt flow of the steam turbine is controlled by controlling the steam exhaust shunt valve and the steam compressor.
The flow of the exhaust steam is controlled, only a small part of the exhaust steam is sent to the condenser, the water consumption of the circulating water of the required circulating water cooling system is obviously reduced, and the energy waste can be obviously reduced.
As an improvement, the flow of the exhaust steam is further controlled, only a small part of the exhaust steam is sent to a condenser, and the water is cooled by the make-up water from a make-up water unit, so that a circulating water cooling system can be removed, and the waste heat of the exhaust steam of the thermal power plant is completely recycled for regeneration and power generation.
The improved steam turbine is characterized in that a second steam extraction pipe, a boiler reheater and a reheat steam pipe are further added, the second steam extraction pipe is connected with the boiler reheater and the steam turbine, the reheat steam pipe is connected with the boiler reheater and the steam turbine, the second steam extraction pipe extracts steam from a high-pressure cylinder of the steam turbine and sends the steam to the boiler reheater for reheating, and the reheat steam pipe sends the reheat steam output by the boiler reheater to an intermediate pressure cylinder of the steam turbine for work generation.
The working principle and the working process of the invention are that the exhaust steam of the steam turbine is recycled, the exhaust steam of the steam turbine is shunted, a small part of the exhaust steam is sent to the condenser to be condensed into condensed water, the back pressure condition required by the steam turbine is met, the majority of the exhaust steam is shunted, compressed steam is obtained after compression and enthalpy extraction, the compressed steam is mixed with the evaporated condensed water to be mixed steam, the mixed steam is sent to the boiler to be heated into high-temperature high-pressure superheated steam, and then the mixed steam is sent to the steam turbine to do work for power generation.
The invention avoids the problem that a large amount of medium is needed for transferring the waste heat of the steam turbine exhaust, and can recycle most or even all of the waste heat of the steam exhaust of the thermal power plant for regeneration and power generation. The invention realizes the recycling of the waste heat of the exhaust steam for regeneration power generation, can obviously reduce energy waste, obviously save fire coal, save water, reduce emission, obviously improve the energy utilization efficiency and the power generation efficiency of a thermal power plant, and has obvious effects of energy conservation, emission reduction and efficiency improvement. The thermal power plant reconstructed or newly built by the technical scheme of the invention has low comprehensive cost and high social and economic benefits.
The technical scheme of the invention is mainly provided for a thermal power plant, and can also be widely applied to a power generation technology of utilizing high-temperature and high-pressure superheated steam to drive a steam turbine to do work, such as a biomass power plant, a nuclear power plant, a solar photo-thermal power plant and the like, and the exhausted steam of the steam turbine is shunted, compressed and enthalpy-extracted and then recycled for regeneration and power generation.
Drawings
Fig. 1 is a schematic diagram of a novel thermal power plant exhaust steam waste heat regeneration power generation system provided by an embodiment of the invention.
The same reference numbers will be used throughout the drawings to refer to the same elements or structures, wherein:
the steam turbine comprises a boiler 1, a steam turbine 2, a generator 3, a condenser 4, a condensate pump 5, a steam compressor 6, a steam-water mixed evaporator 7, a steam pump 8, a steam exhaust pipe 9, a first steam exhaust branch pipe 10a, a second steam exhaust branch pipe 10b, a first condensate pipe 11a, a second condensate pipe 11b, a first steam pipe 12a, a second steam pipe 12b, a superheated steam pipe 13, a water replenishing unit 14, a deaerator 15, a circulating water cooling system 16, a steam extraction pipe 17, a second steam extraction pipe 18, a boiler reheater 19, a reheater steam pipe 20, a steam turbine high pressure cylinder 21 and a steam turbine medium pressure cylinder 22.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Fig. 1 is a schematic diagram of a novel thermal power plant exhaust steam waste heat regeneration power generation system provided by the invention, which mainly comprises: the system comprises a boiler 1, a steam turbine 2, a generator 3, a condenser 4, a condensate pump 5, a steam compressor 6, a steam-water mixed evaporator 7, a steam pump 8, a steam exhaust pipe 9, a first steam exhaust shunt pipe 10a, a second steam exhaust shunt pipe 10b, a first condensate pipe 11a, a second condensate pipe 11b, a first steam pipe 12a, a second steam pipe 12b, a superheated steam pipe 13, a water replenishing unit 14, a deaerator 15, a circulating water cooling system 16, a steam extraction pipe 17, a second steam extraction pipe 18, a boiler reheater 19 and a reheating steam pipe 20;
the steam turbine 2 is connected with the generator 3 through a hot steam pipe 13, a low-pressure cylinder of the steam turbine 2 is connected with a condenser 4 through a steam exhaust pipe 9, the condenser 4 is connected with a condensate pump 5 through a first condensate pipe 11a, the condensate pump 5 is connected with a steam-water mixed evaporator 7 through a second condensate pipe 11b and a deaerator 15, the steam compressor 6 is connected with the steam exhaust pipe 9 through a first steam exhaust shunt pipe 10a, the steam compressor 6 is connected with the steam-water mixed evaporator 7 through a second steam exhaust shunt pipe 10b, the steam-water mixed evaporator 7 is connected with a steam pump 8 through a first steam pipe 12a, the steam pump 8 is connected with the boiler 1 through a second steam pipe 12b, and the steam exhaust pipe 17 is connected with the deaerator 15 and a medium pressure cylinder 22 of the steam turbine 2; the steam-water mixed evaporator 7 is provided with a water inlet, a steam inlet and a steam outlet;
the steam turbine 2 does work under the pushing of superheated steam output by the boiler 1, drives the generator 3 to generate electricity, and simultaneously outputs exhaust steam from the low-pressure cylinder;
a part of the steam discharged by the steam turbine 2 is sent to a condenser 4 through a steam discharge pipe 9 to be condensed into condensed water, and is sent to a water inlet of a steam-water mixed evaporator 7 after being deoxidized through a first condensed water pipe 11a, a condensed water pump 5, a second condensed water pipe 11b and a deaerator 15;
the steam extraction pipe 17 extracts steam from a medium pressure cylinder 22 of the steam turbine 2 and sends the steam to a deaerator 15 to deaerate condensed water;
the other part of the steam output and exhaust of the steam turbine 2 is sent to a steam inlet of a steam-water mixed evaporator 7 through a first steam exhaust shunt pipe 10a, a steam compressor 6 for compression and enthalpy extraction and a second steam exhaust shunt pipe 10 b;
the condensed water at the water inlet is mixed and evaporated into mixed steam by the compressed steam at the steam inlet of the steam-water mixed evaporator 7, the mixed steam is output from the steam outlet and then is sent to the boiler 1 for heating through a first steam pipe 12a, a steam pump 8 and a second steam pipe 12 b;
the condenser 4 condenses the exhaust steam from the exhaust pipe 9 into condensed water;
the steam compressor 6 compresses and extracts the split-flow discharged steam and sends the compressed split-flow discharged steam into the steam-water mixed evaporator 7;
the condensate pump 5 pumps the condensate from the condenser 4 to the second condensate pipe 11b through the first condensate pipe 11a and sends the condensate to the steam-water mixed evaporator 7;
the steam pump 8 feeds the mixed steam stripping enthalpy generated by the steam-water mixed evaporator 7 into the boiler 1 for heating;
the water replenishing unit 14 carries out desalination treatment on the replenished raw water (replenished water) and then sends the desalted raw water into the condenser 4;
the circulating cooling water system 16 cools the condenser 4 by using circulating cooling water;
the deaerator 15 deaerates the condensed water by extracting steam from the intermediate pressure cylinder 22 of the steam turbine 2 through the steam extraction pipe 17.
The invention provides a novel method for realizing a power generation system by regenerating waste steam and waste heat of a thermal power plant, which comprises the following steps:
(1) The steam turbine 2 generates exhaust steam after acting;
(2) The exhaust steam is divided into two parts, one part of the exhaust steam is condensed into condensed water in the condenser 4 through the steam exhaust pipe 9 of the steam turbine, and the condensed water is deoxidized through a first condensed water pipe 11a, a condensed water pump 5, a second condensed water pipe 11b and a deaerator 15 in sequence and then is sent to the water inlet of the steam-water mixed evaporator 7; the other part of the exhaust steam is sequentially subjected to flow division, compression and enthalpy extraction through a first exhaust steam flow division pipe 10a, a steam compressor 6 and a second exhaust steam flow division pipe 10b to obtain compressed steam, and the compressed steam is sent to a steam inlet of a steam-water mixed evaporator 7;
(3) In the steam-water mixed evaporator 7, the condensed water is evaporated into mixed steam by the compressed steam, and then the mixed steam is sent to the boiler 1 for heating;
(4) The mixed steam is sent to the boiler 1 to be heated into high-temperature high-pressure superheated steam, and then is sent to the steam turbine 2 to do work, and the generator 3 is driven to generate electricity.
The joint of the exhaust pipe 9 and the first exhaust shunt pipe 10a is provided with an exhaust shunt valve, and the exhaust shunt flow of the steam turbine is controlled by controlling the exhaust shunt valve and the steam compressor.
Furthermore, the flow rate of the exhaust steam is controlled, only a small part of the exhaust steam is sent to the condenser 4, and the water consumption of the circulating water of the required circulating water cooling system 16 is obviously reduced.
Further, as one of the improvements, the flow rate of the exhaust steam is controlled, only a small part of the exhaust steam is sent to the condenser 4, the supplemented raw water (supplemented water) is treated by the water supplementing unit 14 and then cools the condenser 4, and the circulating water cooling system 16 is removed.
As a second improvement, the novel thermal power plant exhaust steam waste heat regeneration power generation system provided by the invention is additionally provided with a second steam extraction pipe 18, a boiler reheater 19 and a reheat steam pipe 20, wherein the second steam extraction pipe 18 is connected with the boiler reheater 19 and a high-pressure cylinder 21 of the steam turbine 2, the reheat steam pipe 20 is connected with the boiler reheater 19 and a medium-pressure cylinder 22 of the steam turbine 2, the second steam extraction pipe 18 outputs extracted steam from the high-pressure cylinder 21 of the steam turbine 2 and sends the extracted steam to the boiler reheater 19 for reheating, and the reheat steam pipe 20 sends the reheated steam output by the boiler reheater 19 to the medium-pressure cylinder 22 of the steam turbine 2 for work power generation.
The embodiment illustrates a novel thermal power plant exhaust steam waste heat regeneration power generation system structure and a normal working process. In fact, due to the recycling of the exhaust steam of the thermal power plant, the amount of water needed for supplementing during the normal working process of the thermal power plant is very small. And a large amount of water is added through the water supplementing channel only during the starting period of the thermal power plant and is sent to the boiler to be heated into steam. And entering a normal working process when the steam-water circulation of the thermal power plant reaches a rated flow.
The invention provides a method for recycling and regenerating power after shunting, compressing and enthalpy-extracting steam turbine exhaust, and recycling the steam turbine exhaust and the steam turbine exhaust waste heat, so that the energy waste is obviously reduced, the power generation efficiency of a thermal power plant is improved, a large amount of fire coal is saved, the coal consumption is obviously reduced, the emission is reduced, water is saved, and the effects of energy conservation, emission reduction and synergy are obvious.
According to the embodiment, theoretical analysis is carried out on a 660MW supercritical generator set, the energy-saving and consumption-reducing rate is close to 40 percent according to the original average coal consumption of 310g/kWh, the thermoelectric efficiency of 49 percent, the generating efficiency of 43 percent and the rated generating power of 660MW, the coal is saved by 71 million tons/year, the carbon emission is reduced by 49 million tons/year, the carbon dioxide emission is reduced by 187 million tons/year, the sulfur dioxide emission is reduced by 0.6 million tons/year, the net generating capacity of exhaust steam waste heat is 23 hundred million kWh/year, and the energy-saving, emission-reducing and synergistic effects are obvious.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. The utility model provides a steam turbine exhaust waste heat regeneration power generation system which characterized in that, send the boiler after mixing the evaporation condensate water to the steam turbine exhaust reposition of redundant personnel compression enthalpy extraction back and evaporate the electricity generation again, include: the system comprises a boiler (1), a steam turbine (2), a generator (3), a condenser (4), a condensate pump (5), a steam compressor (6), a steam-water mixed evaporator (7), a steam pump (8), a steam exhaust pipe (9), a first steam exhaust shunt pipe (10 a) and a second steam exhaust shunt pipe (10 b), a first condensate pipe (11 a) and a second condensate pipe (11 b), a first steam pipe (12 a) and a second steam pipe (12 b), an overheated steam pipe (13), a water replenishing unit (14), a deaerator (15) and a steam extraction pipe (17);
the steam turbine generator is characterized in that the boiler (1) is connected with a steam turbine (2) through a hot steam pipe (13), the steam turbine (2) is connected with a generator (3), the steam turbine (2) is connected with a condenser (4) through a steam exhaust pipe (9), the condenser (4) is connected with a condensate pump (5) through a first condensate pipe (11 a), the condensate pump (5) is connected with a steam-water mixed evaporator (7) through a second condensate pipe (11 b) and a deaerator (15), the steam compressor (6) is connected with the steam exhaust pipe (9) through a first steam exhaust shunt pipe (10 a), the steam compressor (6) is connected with the steam-water mixed evaporator (7) through a second steam exhaust shunt pipe (10 b), the steam-water mixed evaporator (7) is connected with a steam pump (8) through a first steam pipe (12 a), the steam pump (8) is connected with the boiler (1) through a second steam pipe (12 b), and the steam exhaust pipe (17) is connected with the steam turbine (2);
the steam-water mixed evaporator (7) is provided with a water inlet, a steam inlet and a steam outlet;
the water supplementing unit (14) is provided with a water inlet and a water outlet, supplemented raw water is input from the water inlet, and the supplemented water is output from the water outlet after desalination treatment;
the water supplementing unit (14) sends supplemented raw water subjected to desalination treatment to the condenser (4) to cool a very small part of dead steam sent to the condenser;
the steam turbine (2) works under the pushing of superheated steam output by the boiler (1) to drive the generator (2) to generate electricity and output dead steam at the same time;
an exhaust steam shunt valve is added at the joint of the exhaust steam pipe (9) and the first exhaust steam shunt pipe (10 a), only a small part of exhaust steam can be controlled to be sent to the condenser (4) by controlling the exhaust steam shunt valve and the steam compressor (6), supplemented raw water obtained after the desalting treatment of the water supplementing unit (14) is used for cooling and condensing the supplemented raw water into condensed water, and a circulating water cooling system (16) of a conventional thermal power plant is removed;
a very small part of the exhaust steam of the steam turbine (2) is sent to a condenser (4) through a steam exhaust pipe (9), mixed with makeup water from a water replenishing unit (14) for heat exchange, cooled and condensed into condensed water, deoxygenated through a first condensed water pipe (11 a), a condensed water pump (5), a second condensed water pipe (11 b) and a deoxygenator (15), and then sent to a water inlet of a steam-water mixed evaporator (7);
the steam extraction pipe (17) extracts steam from a medium pressure cylinder (22) of the steam turbine (2) and sends the extracted steam to a deaerator (15) to deaerate condensed water;
the rest most of the dead steam of the steam turbine (2) is converted into compressed steam after being sucked, compressed and enthalpy-extracted through a first steam exhaust shunt pipe (10 a) and a steam compressor (6), and then is sent to a steam inlet of a steam-water mixed evaporator (7) through a second steam exhaust shunt pipe (10 b);
the condensed water at the water inlet is mixed and evaporated into mixed steam by the compressed steam at the steam inlet of the steam-water mixed evaporator (7), and the mixed steam is sent to the boiler (1) for heating through a first steam pipe (12 a), a steam pump (8) and a second steam pipe (12 b);
the boiler (1) is a heating steam boiler and comprises a steam inlet and a steam outlet, mixed steam from a steam-water mixed evaporator (7), a first steam pipe (12 a), a steam pump (8) and a second steam pipe (12 b) is input into the steam inlet, and high-temperature and high-pressure superheated steam is output from the steam outlet after heating;
the superheated steam output by the boiler (1) is sent to the steam turbine (2) to do work, and the generator (3) is driven to generate electricity.
2. The method for realizing the exhaust steam waste heat regeneration power generation system of the thermal power plant as claimed in claim 1, comprising:
(1) The steam turbine (2) generates exhaust steam after acting;
(2) The exhaust steam is divided into two parts, only a small part of the exhaust steam is sent to a condenser (4) through a steam exhaust pipe (9) of a steam turbine, supplemented raw water is subjected to desalination treatment through a water supplementing unit (14) to obtain supplemented water for mixed heat exchange, the supplemented water is cooled and condensed into condensed water, and the condensed water is sent to a water inlet of a steam-water mixed evaporator (7) after being deoxidized through a first condensed water pipe (11 a), a condensed water pump (5), a second condensed water pipe (11 b) and a deaerator (15) in sequence; the rest most of the dead steam is sent to a steam inlet of a steam-water mixed evaporator (7) after being subjected to flow division, compression and enthalpy extraction by a first steam-discharge flow-dividing pipe (10 a), a steam compressor (6) and a second steam-discharge flow-dividing pipe (10 b) in sequence;
(3) In the steam-water mixed evaporator (7), the condensed water at the water inlet is evaporated into mixed steam by the compressed steam at the steam inlet, and the mixed steam is sent to the boiler (1) through the first steam pipe (12 a), the steam pump (8) and the second steam pipe (12 b) to be heated into high-temperature high-pressure superheated steam, and then sent to the steam turbine (2) to do work to drive the generator (3) to generate electricity.
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| CN102022144B (en) * | 2010-11-12 | 2013-10-16 | 华北电力大学（保定） | Thermal power generation system with function of exhaust steam recovery |
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