CN112502800B - Large-scale high-parameter heating system of thermal power plant flexibility - Google Patents
Large-scale high-parameter heating system of thermal power plant flexibility Download PDFInfo
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- CN112502800B CN112502800B CN202011300215.7A CN202011300215A CN112502800B CN 112502800 B CN112502800 B CN 112502800B CN 202011300215 A CN202011300215 A CN 202011300215A CN 112502800 B CN112502800 B CN 112502800B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/06—Steam central heating systems operating with superheated steam
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Abstract
The invention relates to a flexible large-scale high-parameter heat supply system of a thermal power plant, which comprises a thermal power plant system and a high-low pressure steam combined heat exchange system, wherein the thermal power plant system provides a heat source, and the high-low pressure steam combined heat exchange system is used for converting heat supply water into heat supply steam so as to realize external heat supply of the thermal power plant. A large-scale high-parameter heat supply system of a thermal power plant effectively decouples a boiler and a steam turbine system, breaks through rigid coupling of cogeneration of a thermal power unit and ensures large-scale heat supply capacity under a low-load power generation working condition. The high-low pressure steam combined heat exchange system can heat the heat supply water to be high-temperature and high-pressure heat supply steam, so that the high-parameter steam supply capacity of the thermal power plant is improved.
Description
Technical Field
The invention relates to the technical field of heat supply, in particular to a large-scale high-parameter heat supply system with flexibility for a thermal power plant.
Background
With the deep advancement of the electric power market reform process, the energy structure adjustment mainly based on renewable energy sources continuously forces the transformation and upgrading of the existing coal-electricity industry. With the continuous development and maturation of the electric auxiliary service market and the establishment of the electric spot market, thermal power plants will meet the development opportunities for flexible modification technology suitable for the operation of the electric market.
For a heating unit, as the heating load in winter is generally larger, a certain boiler output is required to be maintained, the problem of low-load operation of the boiler is less involved, and the main contradiction is concentrated on the problem that the adjustment range of the power generation output under the condition of meeting the heating is too small, namely the problem of thermal decoupling. How to reduce the work done by the steam while meeting the heat supply, namely the work done by the high-temperature and high-pressure steam in the steam turbine and the redistribution of the heat supply share are key to solving the problem.
Technical routes for improving flexibility of heat supply units are mainly divided into two types: firstly, the heat supply capacity of the unit is increased to reduce the minimum output, and the unit mainly comprises a low-pressure cylinder zero-output technology and a high-back pressure heat supply technology for reducing the through flow link of a turbine and a turbine bypass heat supply technology for reducing the steam flow of the through flow part; the second is the heat energy storage technology, mainly comprising the schemes of hot water tank energy storage, electric boiler solid heat storage, electrode boiler and the like.
The current heat supply technical scheme can achieve the purposes of heat supply and unit load reduction, but can only reduce partial electric load of a thermal power plant and can only provide low-parameter steam.
Disclosure of Invention
In order to solve the problems, the invention provides the flexible large-scale high-parameter heating system of the thermal power plant, which is characterized in that high-pressure main steam and high-temperature reheat steam are used for heating heat supply water at the same time, and then condensed water of the high-pressure main steam and the cooled reheat steam are sent back to a boiler system, so that the safe operation of a boiler and a steam turbine can be ensured, and meanwhile, the flexible large-scale heat supply of the thermal power plant can be realized; the newly-built high-low pressure steam combined heat exchange system can greatly widen the heat supply parameters of heat supply steam, the pressure of the heat supply steam is flexibly regulated within subcritical temperature, the temperature of the heat supply steam does not exceed the rated temperature of main steam of the boiler, and high-parameter heat supply of the thermal power plant is realized.
The technical scheme adopted by the invention is as follows: the utility model provides a large-scale high parameter heating system of thermal power factory flexibility, includes thermal power generation system and high low pressure steam joint heat transfer system, its characterized in that: the thermal power generation system and the high-low pressure steam combined heat exchange system are connected with each other through a steam-water pipeline, and heat supply water is changed into heat supply steam, so that external heat supply of the thermal power plant is realized.
Preferably, the high-low pressure steam combined heat exchange system comprises an overheat heater, a phase change heater, a preheating heater and a high-pressure water feed pump, wherein part of high-pressure main steam of the thermal power generation system enters the overheat heater from a steam inlet pipeline of the overheat heater and exchanges heat with heat supply steam in the overheat heater; then enters the phase change heater from the steam outlet pipeline of the overheat heater, exchanges heat with heat of heat supply water in the phase change heater, and enters the preheat heater through the high-pressure water inlet pipeline of the preheat heater after being condensed into high-pressure water to become high-pressure supercooled water; and finally, the high-pressure water is pressurized by a high-pressure water feed pump and is sent to a water supply system at the outlet of a water feed pump of the thermal power plant, or the high-pressure supercooled water is depressurized and is then sent to a deaerator C of the thermal power plant, so that the high-pressure steam-water circulation of the thermal power plant is realized.
Furthermore, the high-low pressure steam combined heat exchange system further comprises a reheating heater A, a reheating heater B and a steam compressor, part of high-temperature reheating steam of the thermal power generation system enters the reheating heater A from a steam inlet pipeline of the reheating heater A to exchange heat with heat supply steam in the reheating heater A, then enters the reheating heater B from a steam outlet pipeline of the reheating heater A to exchange heat with heat supply and water supply in the reheating heater B, and is pressurized by the steam compressor and then returned to the low-temperature reheating system to realize steam-water circulation of the high-temperature reheating steam of the thermal power plant.
Furthermore, the high-low pressure steam combined heat exchange system further comprises a reheat heater A, an evaporation heater, a reheat heater B and a steam compressor, part of high-temperature reheat steam of the thermal power generation system enters the reheat heater A from a steam inlet pipeline of the reheat heater A to exchange heat with heat supply steam in the reheat heater A, then enters the evaporation heater from a steam outlet pipeline of the reheat heater A to exchange heat, enters the reheat heater B from a steam inlet pipeline of the reheat heater B after cooling, exchanges heat with heat supply water in the reheat heater B, is pressurized by the steam compressor and then returns to the low-temperature reheat system to realize high-temperature reheat steam-water circulation of the thermal power plant.
Furthermore, the heat supply water is pressurized by a heat supply water return pump and then is sent to a deaerator A, the deaerated water is pressurized by the heat supply water supply pump A and then is divided into two paths, one path of the deaerated water enters a preheating heater to be heated, the other path of the deaerated water enters a reheating heater B to be heated, and the two paths of heat supply water directly enter a steam drum A after being heated;
the heat supply saturated water in the steam drum A is heated by the phase change heater and then is divided into two paths of heat supply steam, one path of heat supply steam enters the overheat heater to be heated, the other path of heat supply steam enters the reheat heater A to be heated, and the two paths of heat supply steam become qualified overheat steam after being mixed, so that external heat supply is realized.
Furthermore, the heat supply and water supply are divided into two paths after being pressurized by a heat supply and water return pump, one path of the heat supply and water supply is sent to the deaerator A, the deaerated water is sent to the preheating heater to be heated after being pressurized by the heat supply and water supply pump A, the other path of the heat supply and water supply is sent to the deaerator B, and the deaerated water is sent to the reheating heater B to be heated after being pressurized by the heat supply and water supply pump B;
the heat supply water heated by the preheating heater enters a steam drum A from a heat supply water supply pipeline at an outlet of the preheating heater, and heat supply saturated water in the steam drum A enters the overheating heater to be heated after being heated by the phase change heater, so that qualified overheating steam is formed;
the heat supply water heated by the reheating heater B enters a steam drum B from a heat supply water supply pipeline at an outlet of the reheating heater B, and heat supply saturated water in the steam drum B enters the reheating heater A to be heated after being heated by the evaporation heater, so that qualified superheated steam is formed;
the two paths of qualified superheated steam can be used for supplying heat to the outside after being mixed with the steam with the same parameters, or can be used for supplying heat to the outside respectively by the steam with different parameters.
Furthermore, the high-temperature and high-pressure steam generated by the thermal power generation system is used for directly heating the heat supply water supply, and the rest steam is used for generating power by the steam turbine generator unit. The heat supply capacity of the thermal power generating unit depends on the capacity of the boiler and is not limited by the power generation capacity of the steam turbine.
Furthermore, the working pressure of the heating steam is within the subcritical range, and the working temperature does not exceed the rated temperature of the main steam of the boiler.
The beneficial effects obtained by the invention are as follows: the molten salt is heated by adopting part of high-temperature and high-pressure steam of the thermal power plant, and the high-pressure main steam and the high-temperature reheat steam simultaneously heat the heat supply water, so that the heat supply water is changed into qualified heat supply steam. After being cooled by the heat supply steam-water system, the high-pressure main steam is changed into high-pressure condensed water and then returns to the boiler water supply system, so that the cyclic heating is completed. The high-temperature reheating steam is cooled by the heat supply steam-water system and then becomes low-pressure reheating steam, and the low-pressure reheating steam is pressurized by the steam compressor and then returns to the boiler reheater through the low-temperature reheating system to finish cyclic heating. The rest high-temperature and high-pressure steam of the thermal power plant is sent into a steam turbine to continue to do work and generate electricity. Therefore, the flexible load change of the steam turbine can be realized, the safe operation of the boiler and the steam turbine is ensured, and the deep peak shaving and large-scale high-parameter heat supply can be realized.
The invention has the following advantages:
(1) The boiler and the steam turbine are effectively decoupled, so that the steam turbine can be operated with wide load and flexibility while large-scale heat supply of the thermal power unit is ensured;
(2) When large-scale heat supply is performed, the pressure of the heat supply steam breaks through the pressure limit of reheat steam;
(3) The steam supply temperature may be close to the main steam rated temperature.
Drawings
FIG. 1 is a schematic flow chart of a large-scale high-parameter heating system of a thermal power plant;
FIG. 2 is another embodiment of the present invention;
reference numerals: 1. a conventional thermal power generation system; 1.1, a high-pressure main steam pipeline; 1.2, a high temperature reheat steam line; 1.3, low temperature reheat steam line; 1.4, a water supply pipeline; 1.5, a condensed water pipeline; 1.6, boiler; 1.7, a steam turbine generator unit; 1.8, high pressure feedwater bypass piping; 2. the high-pressure steam and low-pressure steam combined heat exchange system; 2.1, an overheat heater; 2.11, a high-pressure main steam inlet pipeline of the overheat heater; 2.12, a heating steam outlet pipeline of the overheat heater; 2.13, a high-pressure main steam outlet pipeline of the overheat heater; 2.14, a heating steam inlet pipeline of the overheating heater; 2.2, reheating heater A;2.21, a reheat heater A high temperature reheat steam inlet pipe; 2.22, a reheat heater A heat supply steam outlet pipeline; 2.23, a high-temperature reheat steam outlet pipeline of the reheat heater A; 2.24, a reheat heater A supplies heat to a steam inlet pipeline; 2.3, a phase change heater; 2.31, a phase change heater supplies heat to a saturated water inlet pipeline; 2.32, a phase change heater heating saturated steam outlet pipeline; 2.33, an evaporation heater; 2.34, an evaporation heater supplies heat to a saturated water inlet pipeline; 2.35, an evaporation heater supplies heat to a saturated steam outlet pipeline; 2.4, preheating the heater; 2.41, preheating a high-pressure water inlet pipeline of the heater; 2.42, preheating the heater heat supply water supply outlet pipeline; 2.43, preheating the high-pressure water outlet pipeline of the heater; 2.44, preheating the heater heat supply water inlet pipeline; 2.5, reheating heater B;2.51, a reheat heater B low temperature reheat steam outlet pipe; 2.52, a reheat heater B supplies heat to the water inlet pipeline; 2.53, reheat heater B supplies heat to the water outlet pipeline; 2.54, a reheat heater B high temperature reheat steam inlet pipe; 2.6, a vapor compressor; 2.61, a vapor compressor outlet vapor conduit; 2.7, steam drum A;2.71, a heat supply saturated steam outlet pipeline of the steam drum A; 2.72, steam drum B;2.73 drum B heating saturated steam outlet pipe; 2.8, a high-pressure water feed pump; 2.81, feeding water under high pressure to the outlet pipeline of the pump; 2.9, deaerator A;2.91, a heat supply water return pump; 2.92, a heat supply water supply pump A;2.93, a deaerator A supplies heat to the water inlet pipeline; 2.94, a deaerator A heat supply water supply outlet pipeline; 2.95, deaerator B;2.96, deaerator B heat supply water supply inlet pipeline; 2.97, a deaerator B heat supply water supply outlet pipeline; 2.98, a heat supply water supply pump B.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
The invention comprises a thermal power generation system 1 and a high-low pressure steam combined heat exchange system 2, wherein the high-low pressure steam combined heat exchange system 2 is used for simultaneously extracting high-pressure main steam and high-temperature reheat steam, heating water supply into qualified heating steam through a steam-water heat exchanger, cooling the heating water supply into high-pressure condensation water and low-temperature reheat steam respectively, pressurizing the high-pressure condensation water and the low-temperature reheat steam through a water pump and a steam compressor respectively, and then delivering the high-pressure condensation water and the low-temperature reheat steam into a boiler of a tempering power generation system 1, ensuring the safety of a boiler steam turbine, and realizing flexible external heat supply.
As shown in fig. 1, a large-scale high-parameter heating system of a thermal power plant adopts a mode of series-parallel connection of high-pressure main steam and high-temperature reheat steam to heat heating and water supply.
The specific heat supply process is as follows:
part of high-pressure main steam of the thermal power generation system 1 enters the overheat heater 2.1 from the overheat heater steam inlet pipeline 2.11 and exchanges heat with heat supply steam in the overheat heater 2.1; then enters the phase change heater 2.3 from the steam outlet pipeline 2.13 of the overheat heater to exchange heat with heat supply and water supply in the phase change heater 2.3, and enters the preheating heater 2.4 through the high-pressure water inlet pipeline 2.41 of the preheating heater after being condensed into high-pressure water to become high-pressure supercooled water; and finally, the water is pressurized by a high-pressure water feed pump 2.8 and is sent to a water supply system at the outlet of a water feed pump of the thermal power plant, so that the high-pressure steam-water circulation of the thermal power plant is realized.
Part of high-temperature reheat steam of the thermal power generation system 1 enters the reheat heater A2.2 from the reheat heater A steam inlet pipeline 2.21 to exchange heat with heat supply steam in the reheat heater A2.2, then enters the reheat heater B2.5 from the reheat heater A steam outlet pipeline 2.23 to exchange heat with heat supply water in the reheat heater B2.5, becomes low-pressure reheat steam, is pressurized by the steam compressor 2.6 and then is sent back to the low-temperature reheat system, and the steam-water circulation of the high-temperature reheat steam of the thermal power plant is realized.
The heat supply and water supply are pressurized by a heat supply water return pump 2.91 and then are sent to a deaerator A2.9, after deaeration, the heat supply and water supply pump A2.92 is pressurized and then is divided into two paths, one path enters a preheating heater 2.4 to be heated, the other path enters a reheating heater B2.5 to be heated, and the two paths of heat supply and water supply directly enter a steam drum A2.7 after being heated; the heat supply saturated water in the steam drum A2.7 is heated by the phase change heater 2.3 and then is divided into two paths of heat supply steam again, one path of heat supply steam enters the overheat heater 2.1 to be heated, the other path of heat supply steam enters the reheat heater A2.2 to be heated, and the two paths of heat supply steam become qualified overheat steam after being mixed, so that external heat supply is realized.
The high-temperature and high-pressure steam generated by the thermal power generation system 1 is used for generating power by the steam turbine generator unit except for directly heating heat supply and water supply. The heat supply capacity of the thermal power generating unit depends on the capacity of the boiler and is not limited by the power generation capacity of the steam turbine.
The working pressure of the heating steam is within subcritical, and the working temperature does not exceed the rated temperature of the main steam of the boiler.
Another embodiment:
as shown in fig. 2, the large-scale high-parameter heating system of the thermal power plant adopts a mode of connecting high-pressure main steam and high-temperature reheat steam in parallel to heat the heating water.
The specific heat supply process is as follows:
part of high-pressure main steam of the thermal power generation system 1 enters the overheat heater 2.1 from the overheat heater steam inlet pipeline 2.11 and exchanges heat with heat supply steam in the overheat heater 2.1; then enters the phase change heater 2.3 from the steam outlet pipeline 2.13 of the overheat heater to exchange heat with heat supply and water supply in the phase change heater 2.3, and enters the preheating heater 2.4 through the high-pressure water inlet pipeline 2.41 of the preheating heater after being condensed into high-pressure water to become high-pressure supercooled water; and finally, the water is pressurized by a high-pressure water feed pump 2.8 and is sent to a water supply system at the outlet of a water feed pump of the thermal power plant, so that the high-pressure steam-water circulation of the thermal power plant is realized.
Part of high-temperature reheat steam of the thermal power generation system 1 enters the reheat heater A2.2 from the steam inlet pipeline 2.21 of the reheat heater A to exchange heat with heat supply steam in the reheat heater A2.2, then enters the evaporation heater 2.33 from the steam outlet pipeline 2.23 of the reheat heater A to exchange heat, enters the reheat heater B2.5 from the steam inlet pipeline 2.54 of the reheat heater B after being cooled, exchanges heat with heat supply water in the reheat heater B2.5, changes into low-pressure reheat steam, and is pressurized by the steam compressor 2.6 and then sent back to the low-temperature reheat system to realize high-temperature reheat steam-water circulation of the thermal power plant.
The heat supply and water supply are divided into two paths after being pressurized by a heat supply and water return pump 2.91, one path is sent to a deaerator A2.9, after deoxidization, the deoxidized water is sent to a preheating heater 2.4 to be heated after being pressurized by a heat supply and water supply pump A2.92, the other path is sent to a deaerator B2.95, and after deoxidization, the deoxidized water is sent to a reheating heater B2.5 to be heated after being pressurized by a heat supply and water supply pump B2.99;
the heat supply water heated by the preheating heater 2.4 enters the steam drum A2.7 from the heat supply water supply pipeline 2.42 at the outlet of the preheating heater, and the heat supply saturated water in the steam drum A2.7 enters the overheating heater 2.1 to be heated after being heated by the phase change heater 2.3, so that qualified overheated steam is formed;
the hot water supply heated by the reheating heater B2.5 enters the steam drum B2.72 from the outlet hot water supply pipeline 2.53 of the reheating heater B, and the hot saturated water in the steam drum B2.72 enters the reheating heater A2.2 to be heated after being heated by the evaporation heater 2.33, so that qualified superheated steam is formed;
the two paths of qualified superheated steam can be used for supplying heat to the outside after being mixed with the steam with the same parameters, or can be used for supplying heat to the outside respectively by the steam with different parameters.
The high-temperature and high-pressure steam generated by the thermal power generation system 1 is used for generating power by the steam turbine generator unit except for directly heating heat supply and water supply. The heat supply capacity of the thermal power generating unit depends on the capacity of the boiler and is not limited by the power generation capacity of the steam turbine.
The working pressure of the heating steam is within subcritical, and the working temperature does not exceed the rated temperature of the main steam of the boiler.
The foregoing has shown and described the basic principles and main structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The utility model provides a large-scale high parameter heating system of thermal power factory flexibility, includes thermal power generation system (1) and high low pressure steam joint heat transfer system (2), its characterized in that: the thermal power generation system (1) and the high-low pressure steam combined heat exchange system (2) are connected with each other through steam-water pipelines, so that heat supply and water supply are changed into heat supply steam, and external heat supply of the thermal power plant is realized; the high-temperature high-pressure steam generated by the thermal power generation system (1) is used for directly heating heat supply water and the rest is used for generating electricity by the steam turbine generator unit; the heat supply capacity of the thermal power generating unit depends on the capacity of the boiler and is not limited by the power generation capacity of the steam turbine;
the high-low pressure steam combined heat exchange system (2) comprises an overheat heater (2.1), a phase change heater (2.3), a preheating heater (2.4) and a high-pressure water feed pump (2.8), and part of high-pressure main steam of the thermal power generation system (1) enters the overheat heater (2.1) from a steam inlet pipeline (2.11) of the overheat heater and exchanges heat with heat supply steam in the overheat heater (2.1); then enters the phase change heater (2.3) from the steam outlet pipeline (2.13) of the overheat heater, exchanges heat with heat supply water in the phase change heater (2.3), and enters the preheating heater (2.4) through the high-pressure water inlet pipeline (2.41) of the preheating heater after being condensed into high-pressure water to become high-pressure supercooled water; finally, the high-pressure water is pressurized by a high-pressure water feed pump (2.8) and is sent to a water supply system at the outlet of a water feed pump of the thermal power plant, or the high-pressure supercooled water is depressurized and then is sent to a deaerator C of the thermal power plant, so that the high-pressure steam-water circulation of the thermal power plant is realized;
the high-low pressure steam combined heat exchange system (2) further comprises a reheating heater A (2.2), a reheating heater B (2.5) and a steam compressor (2.6), part of high-temperature reheating steam of the thermal power generation system (1) enters the reheating heater A (2.2) from a steam inlet pipeline (2.21) of the reheating heater A, exchanges heat with heating steam in the reheating heater A (2.2), enters the reheating heater B (2.5) from a steam outlet pipeline (2.23) of the reheating heater A, exchanges heat with heating water in the reheating heater B (2.5), is pressurized by the steam compressor (2.6) after being changed into low-pressure reheating steam, and is sent back to the low-temperature reheating system to realize high-temperature reheating steam-water circulation of the thermal power plant;
the heat supply and water supply are pressurized by a heat supply water return pump (2.91) and then sent to a deaerator A (2.9), after deaeration, the heat supply and water supply pump A (2.92) is pressurized and then divided into two paths, one path enters a preheating heater (2.4) to be heated, the other path enters a reheating heater B (2.5) to be heated, and the two paths of heat supply and water supply directly enter a steam drum A (2.7) after being heated;
the heat supply saturated water in the steam drum A (2.7) is heated by the phase change heater (2.3) and then is divided into two paths of heat supply steam again, one path of heat supply steam enters the overheat heater (2.1) to be heated, the other path of heat supply steam enters the reheat heater A (2.2) to be heated, and the two paths of heat supply steam become qualified overheat steam after being mixed, so that external heat supply is realized.
2. The utility model provides a large-scale high parameter heating system of thermal power factory flexibility, includes thermal power generation system (1) and high low pressure steam joint heat transfer system (2), its characterized in that: the thermal power generation system (1) and the high-low pressure steam combined heat exchange system (2) are connected with each other through steam-water pipelines, so that heat supply and water supply are changed into heat supply steam, and external heat supply of the thermal power plant is realized; the high-temperature high-pressure steam generated by the thermal power generation system (1) is used for directly heating heat supply water and the rest is used for generating electricity by the steam turbine generator unit; the heat supply capacity of the thermal power generating unit depends on the capacity of the boiler and is not limited by the power generation capacity of the steam turbine;
the high-low pressure steam combined heat exchange system (2) comprises an overheat heater (2.1), a phase change heater (2.3), a preheating heater (2.4) and a high-pressure water feed pump (2.8), and part of high-pressure main steam of the thermal power generation system (1) enters the overheat heater (2.1) from a steam inlet pipeline (2.11) of the overheat heater and exchanges heat with heat supply steam in the overheat heater (2.1); then enters the phase change heater (2.3) from the steam outlet pipeline (2.13) of the overheat heater, exchanges heat with heat supply water in the phase change heater (2.3), and enters the preheating heater (2.4) through the high-pressure water inlet pipeline (2.41) of the preheating heater after being condensed into high-pressure water to become high-pressure supercooled water; finally, the high-pressure water is pressurized by a high-pressure water feed pump (2.8) and is sent to a water supply system at the outlet of a water feed pump of the thermal power plant, or the high-pressure supercooled water is depressurized and then is sent to a deaerator C of the thermal power plant, so that the high-pressure steam-water circulation of the thermal power plant is realized;
the high-low pressure steam combined heat exchange system (2) further comprises a reheat heater A (2.2), an evaporation heater (2.33), a reheat heater B (2.5) and a steam compressor (2.6), part of high-temperature reheat steam of the thermal power generation system (1) enters the reheat heater A (2.2) from a reheat heater A steam inlet pipeline (2.21), exchanges heat with heat supply steam in the reheat heater A (2.2), then enters the evaporation heater (2.33) from a reheat heater A steam outlet pipeline (2.23) for heat exchange, enters the reheat heater B (2.5) from a reheat heater B steam inlet pipeline (2.54) after being cooled, and enters the reheat heater B (2.5) for heat supply, water supply and heat exchange, is pressurized by the steam compressor (2.6) and then returns to the low-temperature reheat system to realize high-temperature reheat steam-water circulation of the thermal power plant;
the heat supply and water supply are divided into two paths after being pressurized by a heat supply water return pump (2.91), one path is sent to a deaerator A (2.9), after deoxidization, the deoxidized water is sent to a preheating heater (2.4) to be heated after being pressurized by a heat supply water supply pump A (2.92), and the other path is sent to a deaerator B (2.95), and is sent to a reheating heater B (2.5) to be heated after being pressurized by a heat supply water supply pump B (2.98);
the heat supply water heated by the preheating heater (2.4) enters the steam drum A (2.7) from the heat supply water supply pipeline (2.42) at the outlet of the preheating heater, and the heat supply saturated water in the steam drum A (2.7) enters the overheat heater (2.1) to be heated after being heated by the phase change heater (2.3) to become qualified overheat steam;
the heat supply water heated by the reheating heater B (2.5) enters the steam drum B (2.72) from the heat supply water supply pipeline (2.53) at the outlet of the reheating heater B, and the heat supply saturated water in the steam drum B (2.72) enters the reheating heater A (2.2) to be heated after being heated by the evaporation heater (2.33) to become qualified superheated steam;
the two paths of qualified superheated steam are mixed with the steam with the same parameter and then externally supplied with heat, or the steam with different parameters respectively externally supplied with heat.
3. A thermal power plant flexible large-scale high-parameter heating system according to claim 1 or 2, characterized in that: the working pressure of the heating steam is within subcritical, and the working temperature does not exceed the rated temperature of the main steam of the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011300215.7A CN112502800B (en) | 2020-11-19 | 2020-11-19 | Large-scale high-parameter heating system of thermal power plant flexibility |
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| CN202011300215.7A CN112502800B (en) | 2020-11-19 | 2020-11-19 | Large-scale high-parameter heating system of thermal power plant flexibility |
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| CN112502800A CN112502800A (en) | 2021-03-16 |
| CN112502800B true CN112502800B (en) | 2023-08-18 |
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