CN114659089B - Deep waste heat utilization system and method for coal-fired generator set - Google Patents
Deep waste heat utilization system and method for coal-fired generator set Download PDFInfo
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- CN114659089B CN114659089B CN202210332959.XA CN202210332959A CN114659089B CN 114659089 B CN114659089 B CN 114659089B CN 202210332959 A CN202210332959 A CN 202210332959A CN 114659089 B CN114659089 B CN 114659089B
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- 239000002918 waste heat Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 166
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 120
- 239000006096 absorbing agent Substances 0.000 claims abstract description 31
- 238000009833 condensation Methods 0.000 claims abstract description 16
- 230000005494 condensation Effects 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 43
- 238000004140 cleaning Methods 0.000 claims description 17
- 238000010248 power generation Methods 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 14
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 239000010908 plant waste Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a deep waste heat utilization system and method of a coal-fired power generating unit, comprising a clean water tank and an absorption heat pump set; the absorption heat pump group comprises an absorption heat pump generator, an absorption heat pump absorber, an absorption heat pump evaporator and an absorption heat pump condenser which are connected; the clean water tank is connected with the absorption heat pump evaporator. The whole system uses auxiliary steam and low-pressure bypass steam as driving heat sources of the absorption heat pump set to transfer the drain waste heat of the clean water tank to the condensation water. The invention not only fully utilizes low-pressure bypass steam and drainage waste heat of a steam turbine system pipeline at the initial stage of starting the unit, improves the waste heat utilization rate of a power plant, but also improves the temperature of condensation water, reduces the coal consumption of a boiler at the initial stage of starting, and greatly improves the safety and economy of the operation of the unit.
Description
Technical Field
The invention belongs to the technical fields of power plant waste heat recovery and energy conservation and environmental protection, and particularly relates to a deep waste heat utilization system and method for a coal-fired power generator set.
Background
By the end of 2021, the generated energy of thermal power generation accounts for more than 60% of the total generated energy, but the power supply coal consumption is still more than 300 g/(kW.h), and the power generation efficiency of a large-sized unit is still not high, so that the power generation efficiency of the unit is improved, and the energy conservation and emission reduction of a power plant are realized. At present, power plant waste heat utilization becomes an important way to solve this problem.
In the process of flushing, constant speed, grid connection and load lifting of the steam turbine, drainage of each pipeline of the steam turbine system is carried to a clean drainage expansion vessel, and the drainage is discharged into a condenser through a clean water tank after being condensed in the expansion vessel, so that heat loss is caused. The low-pressure bypass is always in a working state in the process of flushing and rotating the unit and setting the speed, and a large amount of steam is directly discharged into the condenser through the bypass under the action of the temperature reducing water, so that heat loss is also caused. Meanwhile, as the water supply temperature of the condensed water is not high in the process, the main steam temperature of the unit is easy to be higher, and the operation safety and stability of the equipment and the service life of the equipment are affected. It is necessary to increase the condensation water temperature at the initial stage of starting the unit and the utilization rate of the waste heat of the power plant.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a deep waste heat utilization system and method for a coal-fired power generation unit, which are characterized in that an absorption heat pump is used for recycling waste heat of drainage water in a clean water tank, transferring heat to condensation water, ensuring the stability of the safety of the system operation at the initial stage of starting the unit and improving the operation efficiency of the unit.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a deep waste heat utilization system of a coal-fired generator set comprises a clean water tank and an absorption heat pump set;
the absorption heat pump group comprises an absorption heat pump generator, an absorption heat pump absorber, an absorption heat pump evaporator and an absorption heat pump condenser; the vapor outlet of the absorption heat pump generator is connected with the vapor inlet of the absorption heat pump condenser, the vapor outlet of the absorption heat pump condenser is connected with the vapor inlet of the absorption heat pump evaporator, the vapor outlet of the absorption heat pump evaporator is connected with the vapor inlet of the absorption heat pump absorber, and the vapor outlet of the absorption heat pump absorber is connected with the vapor inlet of the absorption heat pump generator; the circulating medium outlet of the absorption heat pump absorber is connected with the circulating medium inlet of the absorption heat pump generator, and the circulating medium outlet of the absorption heat pump generator is connected with the circulating medium inlet of the absorption heat pump absorber;
the clean water tank is connected with the absorption heat pump evaporator.
The invention is further improved in that a solution heat exchanger is arranged between the absorption heat pump generator and the absorption heat pump absorber.
The invention is further improved in that the steam outlet of the absorption heat pump condenser is connected with the steam inlet of the absorption heat pump evaporator through a throttle valve;
a solution pump is arranged between the circulating working medium outlet of the absorption heat pump absorber and the circulating working medium inlet of the absorption heat pump generator;
the circulating medium outlet of the absorption heat pump generator is connected with the circulating medium inlet of the absorption heat pump absorber through a circulating medium regulating valve.
The invention further improves that the invention also comprises a condenser, the driving heat source of the absorption heat pump generator comprises two paths, one path is an auxiliary steam header, and the auxiliary steam header is connected with the steam inlet of the absorption heat pump generator through a steam inlet regulating valve; the other path is low-pressure bypass steam, the low-pressure bypass steam is divided into two paths after passing through a low-pressure bypass valve, one pipeline is connected with a steam inlet of the absorption heat pump generator through a low-pressure bypass steam regulating valve, and the other pipeline is connected with a condenser through an electric valve.
The invention further improves the heat exchanger, the driving heat source outlet of the absorption heat pump generator is connected with the hot side inlet of the heat exchanger, and the hot side outlet of the heat exchanger is connected with the inlet of the condenser.
The invention is further improved in that the inlet of the cleaning water tank is connected with the drainage expansion tank, the outlet of the cleaning water tank is divided into two paths, one path is connected with the condenser through the electric valve, the other path is connected with the heat source water inlet of the absorption heat pump evaporator through the heat source water inlet electric valve of the absorption heat pump evaporator, and the heat source water outlet of the absorption heat pump evaporator is connected with the condenser through the heat source water outlet electric valve of the absorption heat pump evaporator.
The invention further improves the low-pressure heat recovery system, wherein a condensate inlet of the absorption heat pump absorber is provided with a water inlet electric valve, a condensate outlet of the absorption heat pump absorber is connected with a condensate inlet of the absorption heat pump condenser through the absorption heat pump evaporator, a condensate outlet of the absorption heat pump condenser is connected with a condensate inlet of the heat exchanger, and a condensate outlet of the heat exchanger is connected with the low-pressure heat recovery system through a backwater electric valve;
the low-pressure heat recovery system is also connected with a bypass electric valve, and condensed water enters the low-pressure heat recovery system through the bypass electric valve.
A method for deep waste heat utilization of a coal-fired power generation unit according to the system described above, comprising the steps of:
the drain water enters a cleaning water tank through a drain flash tank, a low-pressure bypass is opened to a condenser electric valve, a low-pressure bypass steam inlet regulating valve is closed, a driving heat source of an absorption heat pump generator is auxiliary steam, the auxiliary steam inlet regulating valve is opened, a heat source water inlet electric valve and an outlet electric valve of the absorption heat pump evaporator are opened, and the cleaning water tank is closed to the condenser electric valve; and opening a condensate water inlet electric valve and a return water electric valve, and transmitting the hydrophobic heat of the clean water tank to the condensate water by the absorption heat pump set.
The invention is further improved in that an outlet electric valve of the heat exchanger is opened, and the heat exchanger heats condensed water;
when the temperature after the low-pressure bypass valve is gradually increased to meet the requirement, the low-pressure bypass steam inlet regulating valve is opened, the low-pressure bypass is closed to the condenser electric valve, the auxiliary steam inlet regulating valve is closed, and the driving heat source of the absorption heat pump generator is used for completing steam source switching;
when the unit is connected with the grid, if the unit maintains low-load operation, the low-pressure bypass valve is opened, low-pressure bypass steam is used as a driving heat source of the absorption heat pump set, if the unit needs to quickly lift load to meet the power grid requirement, the low-pressure bypass valve is closed, the auxiliary steam inlet regulating valve and the low-pressure bypass to the condenser motor valve are opened, the low-pressure bypass steam inlet regulating valve is closed, and the steam source switching is completed.
The invention is further improved in that when the pipelines of the steam turbine system are all warm pipes, the auxiliary steam inlet regulating valve, the low-pressure bypass steam inlet regulating valve, the heat source water inlet electric valve, the outlet electric valve, the condensate water inlet electric valve and the backwater electric valve of the absorption heat pump evaporator are closed, and the stop of the absorption heat pump set under the normal state is completed;
when an emergency accident occurs in the absorption heat pump set, the auxiliary steam inlet regulating valve, the low-pressure bypass steam inlet regulating valve, the condensed water inlet electric valve and the backwater electric valve are closed, and the heat source water inlet electric valve and the heat source water outlet electric valve of the absorption heat pump evaporator are closed, so that the shutdown of the absorption heat pump set in the accident state is completed;
opening a low-pressure bypass to the condenser electric valve, and leading low-side steam to the condenser; opening a condensate bypass electric valve, and enabling condensate to go to a low-pressure heat recovery system through a bypass; and opening the cleaning water tank to the electric valve of the condenser, and enabling the drain water in the cleaning water tank to enter the condenser.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a deep waste heat utilization system and a deep waste heat utilization method for a coal-fired power generating unit, which utilize auxiliary steam and low-pressure bypass steam as driving heat sources of an absorption heat pump set to transfer drain waste heat of a clean water tank to condensate water.
Furthermore, the high-temperature saturated water generated after the heat source is driven to release heat can be used for carrying out secondary heating on the condensed water in the heat exchanger.
The invention utilizes the absorption type heat pump set to transfer the hydrophobic heat of the clean water tank to the condensed water, improves the utilization rate of the waste heat of the power plant, and improves the temperature of the condensed water.
Furthermore, the invention provides a control strategy of the system in the accident state, and the system can be isolated at the first time under the accident working condition, so that the stable operation of the whole unit is ensured.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals illustrate:
1 is an absorption heat pump generator, 2 is an absorption heat pump absorber, 3 is an absorption heat pump evaporator, 4 is an absorption heat pump condenser, 5 is a solution heat exchanger, 6 is a circulating medium regulating valve, 7 is a solution pump, 8 is a throttle valve, 9 is a heat exchanger, 10 is an auxiliary steam header, 11 is an auxiliary steam inlet regulating valve, 12 is low-pressure bypass steam, 13 is a low-pressure bypass valve, 14 is a low-side steam inlet regulating valve, 15 is a low-pressure bypass to condenser electric valve, 16 is a condenser, 17 is condensed water, 18 is a condensed water inlet electric valve, 19 is a condensed water return electric valve, 20 is a condensed water bypass electric valve, 21 is a heat exchanger outlet electric valve, 22 is a low-pressure regenerative system, 23 is a drain expansion vessel, 24 is a clean water tank, 25 is a clean water tank to condenser electric valve, 26 is an absorption heat pump evaporator heat source water inlet electric valve, and 27 is an absorption heat pump evaporator heat source water outlet electric valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the deep waste heat utilization system of the coal-fired power generation unit comprises an auxiliary steam header 10, a clean water tank 24, a low-pressure bypass, a condensation water pipeline and an absorption heat pump set.
Wherein the absorption heat pump group comprises an absorption heat pump generator 1, an absorption heat pump absorber 2, an absorption heat pump evaporator 3 and an absorption heat pump condenser 4; the vapor outlet of the absorption heat pump generator 1 is connected with the vapor inlet of the absorption heat pump condenser 4, the vapor outlet of the absorption heat pump condenser 4 is connected with the vapor inlet of the absorption heat pump evaporator 3, the vapor outlet of the absorption heat pump evaporator 3 is connected with the vapor inlet of the absorption heat pump absorber 2, and the vapor outlet of the absorption heat pump absorber 2 is connected with the vapor inlet of the absorption heat pump generator 1.
The circulating medium outlet of the absorption heat pump absorber 2 is connected with the circulating medium inlet of the absorption heat pump generator 1, the circulating medium outlet of the absorption heat pump generator 1 is connected with the circulating medium inlet of the absorption heat pump absorber 2, and heat exchange is carried out between the two pipelines through the solution heat exchanger 5.
The vapor outlet of the absorption heat pump condenser 4 is connected with the vapor inlet of the absorption heat pump evaporator 3 through a throttle valve 8, a solution pump 7 is arranged between the circulating medium outlet of the absorption heat pump absorber 2 and the circulating medium inlet of the absorption heat pump generator 1, and the circulating medium outlet of the absorption heat pump generator 1 is connected with the circulating medium inlet of the absorption heat pump absorber 2 through a circulating medium regulating valve 6.
The driving heat source of the absorption heat pump generator 1 is provided with two paths of steam sources, one path is an auxiliary steam header 10, and the other path is low-pressure bypass steam 12. The auxiliary steam header 10 (auxiliary steam is arranged in the auxiliary steam header 10) is connected with a steam inlet of the absorption heat pump generator 1 through a steam inlet regulating valve 11, low-pressure bypass steam 12 is connected with an inlet of a low-pressure bypass valve 13, an outlet of the low-pressure bypass valve 13 is divided into two paths, one path is connected with the absorption heat pump generator 1 through a low-pressure bypass steam regulating valve 14, and the other path is connected with a condenser 16 through an electric valve 15.
The driving heat source outlet of the absorption heat pump generator 1 is connected with the hot side inlet of the heat exchanger 9, and the hot side outlet of the heat exchanger 9 is connected with the inlet of the condenser 16 through a drainage pipeline.
The drain flash tank 23 is connected with an inlet of the cleaning water tank 24, an outlet of the cleaning water tank 24 is connected with the condenser 16 through an electric valve 25, a cleaning water outlet bypass is arranged at the outlet of the cleaning water tank 24, the cleaning water outlet bypass is connected with a heat source water inlet of the absorption heat pump evaporator 3 through an absorption heat pump evaporator heat source water inlet electric valve 26, and a heat source water outlet of the absorption heat pump evaporator 3 is connected with the condenser 16 through an absorption heat pump evaporator heat source water outlet electric valve 27.
The condensation water 17 enters the absorption heat pump absorber 2 through the water inlet electric valve 18, the condensation water outlet of the absorption heat pump absorber 2 is connected with the condensation water inlet of the absorption heat pump condenser 4 through the absorption heat pump evaporator 3, the condensation water outlet of the absorption heat pump condenser 4 is connected with the condensation water inlet of the heat exchanger 9, and the condensation water outlet of the condensation water leaving the heat exchanger 9 is connected with the low-pressure heat recovery system 22 through the backwater electric valve 19. The condensed water pipeline is provided with a bypass, and a bypass electric valve 20 is arranged on the bypass, namely the other path of condensed water 17 enters the low-pressure heat recovery system 22 through the bypass electric valve 20.
The invention discloses a deep waste heat utilization method of a coal-fired power generation unit, which comprises the following steps of:
before the turbine is turned over, after the boiler is ignited, drain valves of various pipelines of the turbine system are opened, drain enters a clean water tank 24 through a drain expansion vessel 23, and because the temperature of the low-pressure bypass valve 13 is low at this time, the low-pressure bypass is opened to the condenser electric valve 15, and the low-pressure bypass steam inlet regulating valve 14 is closed. The driving heat source of the absorption heat pump generator 1 is auxiliary steam, the auxiliary steam inlet regulating valve 11 is opened, and the auxiliary steam inlet regulating valve 11 controls the auxiliary steam flow. Opening an absorption heat pump evaporator heat source water inlet electric valve 26 and an outlet electric valve 27, and closing a clean water tank to the condenser electric valve 25; the condensate water inlet electric valve 18 and the backwater electric valve 19 are opened, the condensate water bypass electric valve 20 is closed, and the absorption heat pump set transfers the drain heat of the clean water tank to the condensate water. The electric valve 21 at the outlet of the heat exchanger is opened, the heat exchanger 9 is put into operation, and the condensation water is continuously heated.
When the temperature of the low-pressure bypass valve 13 gradually rises to meet the requirement, the low-pressure bypass steam inlet regulating valve 14 is opened, the low-pressure bypass is closed to the condenser electric valve 15, the auxiliary steam inlet regulating valve 11 is closed, and the driving heat source of the absorption heat pump generator is used for completing steam source switching.
When the steam turbine is in the process of flushing and constant speed, the driving heat source of the absorption heat pump generator 1 is low-pressure bypass steam 12.
When the thermal generator set is connected to the grid, if the set keeps low-load operation, the low-pressure bypass valve 13 is not completely closed, and the low-pressure bypass steam can be used as a driving heat source of the absorption heat pump set. If the unit needs to quickly raise load to meet the power grid requirement, the low-pressure bypass valve 13 can be quickly closed, the driving heat source of the absorption heat pump set needs to be quickly switched to auxiliary steam, at the moment, the auxiliary steam inlet regulating valve 11 and the low-pressure bypass to the condenser electric valve 15 are opened, the low-pressure bypass steam inlet regulating valve 14 is closed, and the steam source switching is completed.
When the pipelines of the steam turbine system are fully warmed, after the drain valve of the pipeline is closed, the auxiliary steam inlet regulating valve 11 and the low-pressure bypass steam inlet regulating valve 14 are closed, the heat source water inlet electric valve 26 and the outlet electric valve 27 of the absorption heat pump evaporator are closed, the condensate water inlet electric valve 18 and the backwater electric valve 19 are closed, and the shutdown of the heat pump set in a normal state is completed.
When an emergency accident occurs in the absorption heat pump set, the auxiliary steam inlet regulating valve 11, the low-pressure bypass steam inlet regulating valve 14, the condensate water inlet electric valve 18 and the backwater electric valve 19 are closed, and the heat source water inlet electric valve 26 and the heat source water outlet electric valve 27 of the absorption heat pump evaporator are closed, so that the shutdown of the absorption heat pump set in the accident state is completed. Opening a low-pressure bypass to the condenser electric valve 15, and leading low-side steam to the condenser 16; opening the condensate bypass electric valve 20, and leading condensate to the low-pressure heat recovery system 22 through the bypass; the clean water tank is opened to the condenser electric valve 25, and the drain of the clean water tank is directly sent to the condenser 16.
The whole system uses auxiliary steam and low-pressure bypass steam as driving heat sources of the absorption heat pump set to transfer the drain waste heat of the clean water tank to the condensation water. The system not only fully utilizes low-pressure bypass steam and drainage waste heat of a steam turbine system pipeline at the initial stage of starting the unit, improves the waste heat utilization rate of a power plant, but also improves the temperature of condensation water, reduces the coal consumption of a boiler at the initial stage of starting, and greatly improves the safety and economy of the operation of the unit.
The invention is applicable to thermal power generation units, but is not limited to these units. All the above description illustrates the basic principles, main features and advantages of the present invention. The present invention is not limited by the above embodiments, which are merely illustrative of the principles of the present invention. The invention is subject to various changes and modifications in the actual design construction process, which are all within the scope of the invention as claimed.
Claims (5)
1. The deep waste heat utilization method of the coal-fired power generation unit is characterized by comprising a system based on deep waste heat utilization of the coal-fired power generation unit, wherein the system comprises a clean water tank (24) and an absorption type heat pump set;
the absorption heat pump group comprises an absorption heat pump generator (1), an absorption heat pump absorber (2), an absorption heat pump evaporator (3) and an absorption heat pump condenser (4); the steam outlet of the absorption heat pump generator (1) is connected with the steam inlet of the absorption heat pump condenser (4), the steam outlet of the absorption heat pump condenser (4) is connected with the steam inlet of the absorption heat pump evaporator (3), the steam outlet of the absorption heat pump evaporator (3) is connected with the steam inlet of the absorption heat pump absorber (2), and the steam outlet of the absorption heat pump absorber (2) is connected with the steam inlet of the absorption heat pump generator (1); the circulating medium outlet of the absorption heat pump absorber (2) is connected with the circulating medium inlet of the absorption heat pump generator (1), and the circulating medium outlet of the absorption heat pump generator (1) is connected with the circulating medium inlet of the absorption heat pump absorber (2);
the cleaning water tank (24) is connected with the absorption heat pump evaporator (3);
the system also comprises a condenser (16), wherein the driving heat source of the absorption heat pump generator (1) comprises two paths, one path is an auxiliary steam header (10), and the auxiliary steam header (10) is connected with the steam inlet of the absorption heat pump generator (1) through a steam inlet regulating valve (11); the other path is low-pressure bypass steam (12), the low-pressure bypass steam (12) is divided into two paths after passing through a low-pressure bypass valve (13), one path is connected with a steam inlet of the absorption heat pump generator (1) through a low-pressure bypass steam regulating valve (14), and the other path is connected with a condenser (16) through an electric valve (15);
the heat pump system further comprises a heat exchanger (9), wherein a driving heat source outlet of the absorption heat pump generator (1) is connected with a hot side inlet of the heat exchanger (9), and a hot side outlet of the heat exchanger (9) is connected with an inlet of the condenser (16);
the inlet of the cleaning water tank (24) is connected with a drainage expansion tank (23), the outlet of the cleaning water tank (24) is divided into two paths, one path is connected with the condenser (16) through an electric valve (25), the other path is connected with the heat source water inlet of the absorption heat pump evaporator (3) through an absorption heat pump evaporator heat source water inlet electric valve (26), and the heat source water outlet of the absorption heat pump evaporator (3) is connected with the condenser (16) through an absorption heat pump evaporator heat source water outlet electric valve (27);
the method comprises the following steps:
the drain water enters a clean water tank (24) through a drain expansion tank (23), a low-pressure bypass is opened to a condenser electric valve (15), a low-pressure bypass steam inlet regulating valve (14) is closed, a driving heat source of an absorption heat pump generator (1) is auxiliary steam, an auxiliary steam inlet regulating valve (11) is opened, an absorption heat pump evaporator heat source water inlet electric valve (26) and an outlet electric valve (27) are opened, and the clean water tank is closed to the condenser electric valve (25); opening a condensate water inlet electric valve (18) and a backwater electric valve (19), and transmitting the hydrophobic heat of the cleaning water tank (24) to the condensate water by the absorption heat pump set;
opening an electric valve (21) at the outlet of the heat exchanger, and heating condensation water by the heat exchanger (9);
when the temperature of the low-pressure bypass valve (13) is gradually increased to meet the requirement, the low-pressure bypass steam inlet regulating valve (14) is opened, the low-pressure bypass is closed to the condenser electric valve (15) and the auxiliary steam inlet regulating valve (11) is closed, and the driving heat source of the absorption heat pump generator (1) is used for completing steam source switching;
when the unit is connected with the power grid, if the unit maintains low-load operation, the low-pressure bypass valve (13) is opened, low-pressure bypass steam is used as a driving heat source of the absorption heat pump set, if the unit needs to quickly lift load to meet the power grid requirement, the low-pressure bypass valve (13) is closed, the auxiliary steam inlet regulating valve (11) and the low-pressure bypass to the condenser electric valve (15) are opened, the low-pressure bypass steam inlet regulating valve (14) is closed, and the steam source switching is completed.
2. The deep waste heat utilization method of a coal-fired power generation unit according to claim 1, wherein a solution heat exchanger (5) is arranged between the absorption heat pump generator (1) and the absorption heat pump absorber (2).
3. The deep waste heat utilization method of the coal-fired power generation unit according to claim 1, wherein a steam outlet of the absorption heat pump condenser (4) is connected with a steam inlet of the absorption heat pump evaporator (3) through a throttle valve (8);
a solution pump (7) is arranged between the circulating working medium outlet of the absorption heat pump absorber (2) and the circulating working medium inlet of the absorption heat pump generator (1);
the circulating medium outlet of the absorption heat pump generator (1) is connected with the circulating medium inlet of the absorption heat pump absorber (2) through a circulating medium regulating valve (6).
4. The deep waste heat utilization method of the coal-fired power generation unit according to claim 1, further comprising a low-pressure heat recovery system (22), wherein a condensate inlet of the absorption heat pump absorber (2) is provided with a water inlet electric valve (18), a condensate outlet of the absorption heat pump absorber (2) is connected with a condensate inlet of the absorption heat pump condenser (4) through the absorption heat pump evaporator (3), a condensate outlet of the absorption heat pump condenser (4) is connected with a condensate inlet of the heat exchanger (9), and a condensate outlet of the heat exchanger (9) is connected with the low-pressure heat recovery system (22) through a water return electric valve (19);
the low-pressure heat recovery system (22) is also connected with a bypass electric valve (20), and condensed water enters the low-pressure heat recovery system (22) through the bypass electric valve (20).
5. The method for deep waste heat utilization of the coal-fired power generation unit according to claim 1, wherein when the pipelines of the steam turbine system are all warmed, the auxiliary steam inlet regulating valve (11), the low-pressure bypass steam inlet regulating valve (14), the heat source water inlet electric valve (26), the outlet electric valve (27), the condensate water inlet electric valve (18) and the backwater electric valve (19) of the absorption heat pump set are closed, and the shutdown of the absorption heat pump set in a normal state is completed;
when an emergency accident occurs in the absorption heat pump set, the auxiliary steam inlet regulating valve (11), the low-pressure bypass steam inlet regulating valve (14), the condensate water inlet electric valve (18) and the backwater electric valve (19) are closed, and the heat source water inlet electric valve (26) and the water outlet electric valve (27) of the absorption heat pump evaporator are closed, so that the shutdown of the absorption heat pump set in the accident state is completed;
opening a low-pressure bypass to a condenser electric valve (15), and leading low-side steam to a condenser (16); opening a condensate bypass electric valve (20), and enabling condensate to go to a low-pressure heat recovery system (22) through a bypass; and opening the cleaning water tank to the condenser electric valve (25), and enabling the drain water in the cleaning water tank (24) to enter the condenser (16).
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