CN115076671B - Technological route and system for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired unit - Google Patents
Technological route and system for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired unit Download PDFInfo
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- CN115076671B CN115076671B CN202210812819.2A CN202210812819A CN115076671B CN 115076671 B CN115076671 B CN 115076671B CN 202210812819 A CN202210812819 A CN 202210812819A CN 115076671 B CN115076671 B CN 115076671B
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 230000009467 reduction Effects 0.000 title claims abstract description 20
- 150000003839 salts Chemical class 0.000 claims abstract description 380
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- 238000004146 energy storage Methods 0.000 claims abstract description 58
- 238000010248 power generation Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 104
- 230000005611 electricity Effects 0.000 claims description 47
- 230000009471 action Effects 0.000 claims description 38
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000005338 heat storage Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000003245 coal Substances 0.000 description 17
- 230000009466 transformation Effects 0.000 description 10
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002407 reforming Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009295 sperm incapacitation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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Abstract
A process route and a formed new system for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units, wherein the process route comprises the following steps: 1) Newly-built electric energy storage molten salt system; 2) Newly built fused salt heating systems and/or fused salt industrial steam systems; 3) Newly building a fused salt high-temperature high-pressure steam generation system; 4) The electric energy storage molten salt system and the high-temperature high-pressure steam generation system are connected in parallel with the primary coal-fired boiler system; 5) The high-temperature high-pressure steam generating system is connected with a steam generating system of the original coal-fired unit; 6) Forming a new system; 7) And closing the newly added equipment, and starting the combat readiness emergency function. The new system comprises: the system comprises an electric energy storage molten salt system, a molten salt heating system and/or a molten salt industrial steam system, a molten salt high-temperature high-pressure steam generation system, a coal-fired boiler system, a steam power generation system and a power transmission and distribution system; the invention realizes the aim of carbon emission reduction of the medium and small coal-fired units on the premise of meeting the requirements of civil heat sources and the combat readiness emergency starting function.
Description
Technical Field
The invention belongs to the technical field of reforming coal-fired units, in particular to a process route for reducing carbon emission of a medium-sized and small-sized combat readiness and civil heat source coal-fired unit and a novel system formed by the process route.
Background
For a long time, coal electricity is a main power supply for guaranteeing the safety of power supply in China. By the end of 2019, the coal electric installation in China has 10.4 hundred million kilowatts and 4.56 trillion kilowatts per hour, and the electricity generation amounts respectively account for 51.8 percent and 62.2 percent of the total installation and total electricity generation. At present, the carbon dioxide emission in the power generation and heat supply industries in China accounts for more than 40% of the national emission, and is an important industry of national carbon dioxide emission.
The electric power industry is one of main industries of coal consumption, deep implementation of energy saving, emission reduction, upgrading and transformation of coal power, and continuous reduction of coal consumption of thermal power supply. For coal-fired units with power supply coal consumption of more than 300 g of standard coal/kilowatt hour, the creation condition is quickened to implement energy-saving transformation, and the units which cannot be transformed are phased out to be shut down.
However, some small and medium-sized coal-fired units relate to civil heating or industrial steam, and are used as unique and irreplaceable civil heat source coal-fired units in the region, or relate to the function that the emergency starting is required to be ensured because of incapacitation of combat readiness, if the coal-fired units are stopped to have a great influence on the civil, or directly influence the function of the emergency starting of combat readiness, the current policy adopted is to temporarily avoid stopping the small and medium-sized coal-fired units. However, because the efficiency of the small and medium-sized coal-fired units is low, the coal consumption is high, the carbon emission is relatively large, and the influence of the exempted shutdown of the coal-fired units on the realization of the carbon-to-carbon peak neutralization target is relatively large.
The problem of carbon emission reduction and carbon neutralization of the medium and small coal-fired units is realized under the condition that the civil heating or industrial steam requirement and the combat readiness emergency starting function are not influenced, and has great social and economic significance.
The invention patent CN114440204A discloses a technical scheme for reforming a process route of a standby coal motor unit and a new system formed by the technical scheme, wherein the new system formed by reforming the coal motor unit exerts a normal starting function of the coal motor unit during emergency starting of the coal motor unit and exerts a green energy storage function during long-term stopping of the coal motor unit. Although the invention solves the problems of emergency starting and carbon neutralization of the combat readiness of the medium and small coal-fired units, the invention does not relate to the civil heat source, and can not solve the problem of realizing carbon neutralization on the premise of ensuring that the civil heat source and the combat readiness are met.
Disclosure of Invention
The invention aims to solve the problem of carbon emission reduction of a small and medium-sized coal-fired unit which is in exemption of shutdown due to combat readiness and civil heat sources by the most economic cost on the premise of ensuring meeting the requirements of emergency starting of the civil heat sources and combat readiness.
The technical scheme of the invention is as follows:
a technological route and a formed new system for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units are characterized in that:
The process route comprises the following steps:
firstly, newly building a green heat supply project to meet the requirements of civil heat sources
1) Newly-built an electric energy storage molten salt system (8);
Electric energy in an external power grid (4) enters an electric energy storage molten salt system (8) through a cable (5), low-temperature molten salt is heated into high-temperature molten salt under the action of the electric energy in the electric energy storage molten salt system (8), and electric energy is stored in the electric energy storage molten salt system (8) in a thermal mode;
2) A fused salt heating system (10) and/or a fused salt industrial steam system (11) which are newly built on the basis of the electric energy storage fused salt system (8); the molten salt heating system (10) and/or the molten salt industrial steam system (11) are respectively connected in parallel with an original heating power pipeline (13) to be connected with an original external heat demand (14);
The high-temperature molten salt in the electric energy storage molten salt system (8) is pumped into a newly-built molten salt heating system (10) and/or a molten salt industrial steam system (11) through a molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt and water in the newly-built molten salt heating system (10) and/or the molten salt industrial steam system (11) are subjected to heat exchange to generate a heat source, and the generated heat source is supplied into an original external heat demand (14) through a heating power pipeline (13) under the action of the pump, so that external heating and/or industrial steam supply are realized;
Secondly, on the basis of the newly-built green heat supply project, the coal-fired unit is transformed into a standby and green energy storage integrated power station, so that the aim of carbon emission reduction of the coal-fired unit is fulfilled
1) Newly building a fused salt high-temperature high-pressure steam generation system (9) on the basis of the electric energy storage fused salt system (8);
2) An electric energy storage molten salt system (8) and a molten salt high-temperature high-pressure steam generation system (9) are connected together and are connected with a coal-fired boiler system (1) of the original coal-fired unit in parallel;
the electric energy storage molten salt system (8) pumps high-temperature molten salt into the molten salt high-temperature high-pressure steam generation system (9) through the molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt and water in the molten salt high-temperature high-pressure steam generation system (9) are subjected to heat exchange to generate high-temperature high-pressure steam for generating electricity;
3) The newly-built fused salt high-temperature high-pressure steam generating system (9) is connected into a steam power generating system (2) of the original coal-fired unit;
the high-temperature high-pressure steam in the fused salt high-temperature high-pressure steam generation system (9) enters the steam power generation system (2) to drive a steam turbine therein to generate power, and the generated power is supplied to an external power grid (4) through a cable (5) and a power transmission and distribution system (3);
Third step, forming a new system
On the premise of meeting the requirements of external heating and/or industrial steam and the emergency starting of combat readiness, the carbon emission reduction target of the coal-fired unit is realized, and the function of the green energy storage power station is newly increased;
and fourthly, closing newly added system equipment, and not affecting the original coal-fired unit to play a combat readiness emergency starting function and meeting the original external heat consumption requirement (4).
The previous 2 steps are sequentially carried out in turn, and the first step is a foundation and a premise; the temperature of the high-temperature molten salt stored in the newly-built electric energy storage molten salt system (8) can meet the requirement that the high-temperature high-pressure steam parameters generated in the molten salt high-temperature high-pressure steam generation system (9) can be used for generating electricity, and the quality of the high-temperature molten salt stored in the newly-built electric energy storage molten salt system can meet the requirements of the external heat utilization requirement (14) and the environment-friendly energy storage power station.
The new system formed by the method comprises the following steps: at least one electric energy storage molten salt system, at least one molten salt heating system and/or molten salt industrial steam system, at least one molten salt high-temperature high-pressure steam generation system, at least one coal-fired boiler system, at least one steam power generation system and at least one power transmission and distribution system;
The electric energy storage molten salt system is connected with the molten salt heating system and/or the molten salt industrial steam system through a molten salt pipeline; the electric energy storage molten salt system is connected with the molten salt high-temperature high-pressure steam generation system through a molten salt pipeline; the molten salt high-temperature high-pressure steam generation system is connected with the steam power generation system through a main steam pipeline and a water return pipeline; the coal-fired boiler system is connected with the steam power generation system through a main steam pipeline and a water return pipeline; the fused salt high-temperature high-pressure steam generation system is connected with the coal-fired boiler system in parallel; the main steam pipeline is connected with the water return pipeline in parallel; the steam power generation system is connected with the power transmission and distribution system through a cable; the power transmission and distribution system is connected with the electric energy storage molten salt system through a cable;
The plurality of electric energy storage molten salt systems are connected in parallel; the molten salt heating systems and/or the molten salt industrial steam systems are connected in parallel; a plurality of fused salt high-temperature high-pressure steam generating systems are connected in parallel; a plurality of coal-fired boiler systems are connected in parallel; the steam power generation systems are connected in parallel; the power transmission and distribution systems are connected in parallel.
The power transmission and distribution system is connected with an external power grid through a cable.
The coal-fired boiler system is connected with external heat demand through a heating power pipeline.
The fused salt heating system and/or the fused salt industrial steam system are/is connected with external heat utilization demands through a heating power pipeline.
Further, in the above technical scheme, the electric energy storage molten salt system comprises at least one molten salt electric heater, at least one high-temperature molten salt storage tank and at least one low-temperature molten salt storage tank; the low-temperature molten salt storage tank is connected with the molten salt electric heater through a molten salt pipeline and a molten salt pump; the molten salt electric heater is connected with the high-temperature molten salt storage tank through a molten salt pipeline and a molten salt pump; a plurality of fused salt electric heaters are connected in parallel; a plurality of high-temperature molten salt storage tanks are connected in parallel; a plurality of low-temperature molten salt storage tanks are connected in parallel; providing power for the flow of molten salt through a molten salt pump;
the fused salt preferably adopts low-melting-point quaternary fused salt, and the fused salt has the parameters of melting point of 94 ℃, decomposition temperature of 628 ℃ and heat storage density of 199 kwh/t.
In the technical scheme, the electric energy storage molten salt system and the molten salt high-temperature high-pressure steam generation system are connected together and connected with the coal-fired boiler system in parallel, so that the same function is exerted; the parameters of the generated high-temperature high-pressure steam are consistent with or close to those of the coal-fired boiler system.
In the technical scheme, the parameters of the steam in the main steam pipeline are consistent with or close to those of the coal-fired boiler system, and the high-temperature high-pressure steam flows from the fused salt high-temperature high-pressure steam generation system to the steam power generation system to push the steam power generator to generate power.
In the above technical solution, the water return pipeline may be a plurality of water return pipelines, in which water vapor and/or condensed water flow, and the flowing direction flows from the steam power generation system to the molten salt high-temperature high-pressure water vapor generation system; the main steam pipeline and the water return pipeline form a loop for circulating the process water working medium between the molten salt high-temperature high-pressure steam generation system and the steam power generation system.
In the technical scheme, the power transmission and transformation system is connected with an external power grid through a cable; the energy source is from the electricity of an external power grid, and the electricity of the external power grid is hydroelectric, wind power or photovoltaic electricity; the electricity of the external power grid is green electricity; the electricity of the external grid is valley electricity.
The specific implementation and operation process of the technical scheme is as follows:
1) When the non-combat readiness emergency is started, the coal-fired boiler system is closed
The method comprises the steps of heating low-temperature molten salt from a low-temperature molten salt storage tank by using green electricity or valley electricity such as water electricity, wind electricity or photovoltaic electricity from an external power grid through a power transmission and transformation system through a molten salt electric heater, changing the temperature of the low-temperature molten salt from 200 ℃ to 560 ℃ into high-temperature molten salt, and pumping the high-temperature molten salt at 560 ℃ into the high-temperature molten salt storage tank through a molten salt pipeline by using a molten salt pump for storage.
When external heating is performed, high-temperature molten salt at 560 ℃ stored in a high-temperature molten salt storage tank enters a molten salt heating system through a molten salt pipeline under the action of a molten salt pump, and heat exchange is performed between the high-temperature molten salt and process water in the molten salt heating system; after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the process water is changed into water vapor; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, and water vapor enters an external heat demand through a heating power pipeline under the action of the pump.
When industrial steam is externally supplied, high-temperature molten salt at 560 ℃ stored in a high-temperature molten salt storage tank enters a molten salt industrial steam system through a molten salt pipeline under the action of a molten salt pump, and heat exchange is carried out between the high-temperature molten salt and process water in the molten salt industrial steam system; after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the process water is changed into high-temperature medium-pressure water vapor; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, and the water vapor of the high-temperature medium-pressure water vapor enters an external heat utilization requirement through a heating power pipeline under the action of the pump.
When the function of the green energy storage power station is exerted to externally supply power, high-temperature molten salt at 560 ℃ stored in the high-temperature molten salt storage tank enters a molten salt high-temperature high-pressure steam generation system through a molten salt pipeline under the action of a molten salt pump, and the high-temperature molten salt exchanges heat with steam and/or condensed water from a water return pipeline in the molten salt high-temperature high-pressure steam generation system; after heat exchange, the high-temperature molten salt at 560 ℃ becomes low-temperature molten salt at 200 ℃, and the water vapor and/or condensed water from the water return pipeline 7 becomes high-temperature and high-pressure water vapor; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, high-temperature high-pressure water vapor enters a steam power generation system through a main steam pipeline to push a turbine generator in the steam power generation system to generate power, and generated water vapor and/or condensed water returns to the molten salt high-temperature high-pressure water vapor generation system through a water return pipeline under the action of the pump; the electricity generated by the steam power generation system is supplied to an external power grid through a cable and a power transmission and distribution system.
2) When combat readiness is started in emergency, the electric energy storage molten salt system is closed
The fused salt heating system and/or the fused salt industrial steam system, the fused salt high-temperature high-pressure steam generating system are in a non-operation state, the coal-fired boiler system is started in an emergency mode, and the steam power generation system and the power transmission and distribution system are operated normally; the coal-fired boiler system adopts heat generated by burning coal powder to perform heat exchange with water, external heat utilization requirements are met through a heating power pipeline, generated high-temperature and high-pressure steam enters a steam power generation system through a main steam pipeline to push a turbine generator in the steam power generation system to generate power, and generated steam and/or condensed water returns to the coal-fired boiler system under the action of a pump through a water return pipeline; the electricity generated by the steam power generation system is supplied to an external power grid through a cable and a power transmission and distribution system.
Compared with the prior art, the invention has the following advantages and outstanding technical effects:
On the premise of meeting the requirements of civil heat sources and the combat readiness emergency starting function, the carbon emission reduction and carbon neutralization targets of the small and medium-sized coal-fired units are realized without shutting down due to the civil heat sources and combat readiness reasons; when the coal-fired unit is required to be started in an emergency mode for combat readiness, the coal-fired unit can be started normally, and the normal external heat utilization requirement can be met; the sinking of a large amount of coal electricity capital is avoided, and the employment post of the coal electricity industry is reduced; the system formed after transformation can consume water electricity, wind electricity or photovoltaic electricity to become a green electricity 'reservoir'.
Drawings
FIG. 1 is a schematic diagram of the structure of a coal-fired unit prior to modification.
FIG. 2 is a schematic diagram of a new system formed after modification of a coal-fired unit using the solution of the present invention.
In the figure: 1. a coal fired boiler system; 2. a steam power generation system; 3. a power transmission and transformation system; 4. an external power grid; 5. a cable; 6. a main steam line; 7. a water return line; 8. an electric energy storage molten salt system; 9. a molten salt high-temperature high-pressure steam generation system; 10. a molten salt heating system; 11. a molten salt industrial steam system; 12. a molten salt pipeline; 13. a thermodynamic line; 14. external heat requirements.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a schematic diagram of a structure of a coal-fired unit before modification, wherein the coal-fired unit consists of a coal-fired boiler system 1, a steam power generation system 2 and a power transmission and transformation system 3; the coal-fired boiler system 1 is connected with the steam power generation system 2 through a main steam pipeline 6 and a water return pipeline 7 respectively; the main steam pipeline 6 is connected with the water return pipeline 7 in parallel; the coal-fired boiler system 1 is connected with external heat demand through a heating power pipeline; the steam power generation system 1 is connected with the power transmission and transformation system 3 through a cable 5; the coal-fired boiler system 1 is connected with a fused salt heating system 10 and/or a fused salt industrial steam system 11 through a heating power pipeline 13.
The power transmission and transformation system 3 is connected with an external power grid 4 through a cable 5.
The coal-fired boiler system 1 is connected to an external heat demand 14 via a thermodynamic line 13.
FIG. 2 is a schematic structural diagram of a new system formed after modification of a coal-fired unit by the technical scheme of the invention, the new system formed after modification comprising: at least one electric energy storage molten salt system 8, at least one molten salt heating system 10 and/or molten salt industrial steam system 11, at least one molten salt high-temperature high-pressure steam generation system 9, at least one coal-fired boiler system 1, at least one steam power generation system 2 and at least one power transmission and distribution system 3;
The electric energy storage molten salt system 8 is connected with the molten salt heating system 10 and/or the molten salt industrial steam system 11 through a molten salt pipeline 12; the electric energy storage molten salt system 8 is connected with the molten salt high-temperature high-pressure water vapor generation system 9 through a molten salt pipeline 12; the molten salt high-temperature high-pressure steam generation system 9 is connected with the steam power generation system 2 through a main steam pipeline 6 and a water return pipeline 7; the coal-fired boiler system 1 is connected with the steam power generation system 2 through a main steam pipeline 6 and a water return pipeline 7; the molten salt high-temperature high-pressure steam generation system 9 is connected with the coal-fired boiler system 1 in parallel; the main steam pipeline 6 is connected with the water return pipeline 7 in parallel; the steam power generation system 2 is connected with the power transmission and distribution system 3 through a cable 5; the power transmission and distribution system 3 is connected with an electric energy storage molten salt system 8 through a cable 5;
The plurality of electric energy storage molten salt systems 8 are connected in parallel; a plurality of molten salt heating systems 10 and/or molten salt industrial steam systems 11 are connected in parallel; a plurality of fused salt high-temperature high-pressure steam generating systems 9 are connected in parallel; a plurality of steam power generation systems 2 are connected in parallel; a plurality of power transmission and distribution systems 3 are connected in parallel.
The power transmission and distribution system 3 is connected with an external power grid 4 through a cable 5.
The molten salt heating system 10 and/or the molten salt industrial steam system 11 are connected to an external heat demand 14 via a thermodynamic line 13.
The electric energy storage molten salt system 8 comprises a molten salt electric heater, a high-temperature molten salt storage tank and a low-temperature molten salt storage tank; the low-temperature molten salt storage tank is connected with the molten salt electric heater through a molten salt pipeline and a molten salt pump; the molten salt electric heater is connected with the high-temperature molten salt storage tank through a molten salt pipeline and a molten salt pump; the flow of molten salt is powered by a molten salt pump.
The fused salt preferably adopts low-melting-point quaternary fused salt, the fused salt has the parameters of melting point of 94 ℃, decomposition temperature of 628 ℃ and heat storage density of 199 kwh/t; the energy source for heating the molten salt adopts hydropower, wind power or photovoltaic power; the energy source for heating the molten salt adopts green electricity; the energy source for heating the molten salt adopts valley electricity.
The following is specifically described by taking a process route for reforming 50MW carbon emission reduction of a medium and small coal-fired unit which is exempted from shutdown due to civil heat sources and combat readiness reasons as an example:
1) When the non-combat readiness emergency is started, the coal-fired boiler system is closed
The low-temperature molten salt from the low-temperature molten salt storage tank is heated by a green electricity or a valley electricity such as water electricity, wind electricity or photovoltaic electricity from an external power grid 4 through a power transmission and transformation system 3 through a molten salt electric heater, the temperature of the low-temperature molten salt is changed into high-temperature molten salt from 200 ℃ to 560 ℃, and the high-temperature molten salt at 560 ℃ is pumped into the high-temperature molten salt storage tank through a molten salt pipeline by a molten salt pump for storage.
When external heating is performed, high-temperature molten salt at 560 ℃ stored in a high-temperature molten salt storage tank enters a molten salt heating system 10 through a molten salt pipeline under the action of a molten salt pump, and the high-temperature molten salt exchanges heat with process water at 20 ℃ in the molten salt heating system 10; after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the process water at 20 ℃ is changed into water vapor at 120 ℃; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, and 120 ℃ water vapor enters an external heat utilization requirement through a heating power pipeline under the action of the pump.
When industrial steam is externally supplied, high-temperature molten salt at 560 ℃ stored in a high-temperature molten salt storage tank enters a molten salt industrial steam system 11 through a molten salt pipeline under the action of a molten salt pump, and the high-temperature molten salt exchanges heat with process water at 20 ℃ in the molten salt industrial steam system 11; after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the process water at 20 ℃ is changed into water vapor at 300 ℃ and the pressure of 1.0 MPa; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, and water vapor of water vapor with the temperature of 300 ℃ and the pressure of 1.0MPa enters an external heat demand through a heating power pipeline under the action of the pump.
When the function of the green energy storage power station is exerted to externally supply power, high-temperature molten salt at 560 ℃ stored in the high-temperature molten salt storage tank enters the molten salt high-temperature high-pressure steam generation system 9 through the molten salt pipeline under the action of the molten salt pump, and the high-temperature molten salt exchanges heat with steam and/or condensed water from the water return pipeline 7 in the molten salt high-temperature high-pressure steam generation system 9; after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the water vapor and/or condensed water from the water return pipeline 7 is changed into water vapor at 540 ℃ and the pressure is 12.7 MPa; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, water vapor with the temperature of 540 ℃ and the pressure of 12.7MPa enters a steam power generation system 2 through a main steam pipeline 6 to push a turbine generator in the steam power generation system to generate power, and generated water vapor and/or condensed water returns to a molten salt high-temperature high-pressure water vapor generation system 9 through a water return pipeline 7 under the action of the pump; the electricity generated by the steam power generation system 2 is supplied to an external power grid 4 through a cable 5 and a power transmission and distribution system 3.
2) When combat readiness is started in emergency, the electric energy storage molten salt system 8 is closed
The fused salt heating system 10 and/or the fused salt industrial steam system 11 and the fused salt high-temperature high-pressure steam generating system 9 are in a non-operation state, the coal-fired boiler system 1 is started in an emergency mode, and the steam power generation system 3 and the power transmission and distribution system 3 are operated normally; the coal-fired boiler system 1 adopts heat generated by burning coal dust to exchange heat with water, the external heat demand 14 is met through a heating power pipeline 13, the generated high-temperature high-pressure steam enters the steam power generation system 2 through a main steam pipeline 6 to push a turbine generator in the steam power generation system to generate power, and the generated steam and/or condensed water returns to the coal-fired boiler system 1 under the action of a pump through a water return pipeline 7; the electricity generated by the steam power generation system 2 is supplied to an external power grid 4 through a cable 5 and a power transmission and distribution system 3.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the invention and should not be construed as limiting the scope of the invention. Any simple modification, equivalent variation and variation made according to the scope of the present invention shall still fall within the scope of the patent coverage of this invention.
Claims (5)
1. A process route for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units is characterized in that:
The process route comprises the following steps:
firstly, newly building a green heat supply project to meet the requirements of civil heat sources
1) Newly-built an electric energy storage molten salt system (8);
Electric energy in an external power grid (4) enters an electric energy storage molten salt system (8) through a cable (5), low-temperature molten salt is heated into high-temperature molten salt under the action of the electric energy in the electric energy storage molten salt system (8), and electric energy is stored in the electric energy storage molten salt system (8) in a thermal mode;
2) A fused salt heating system (10) and/or a fused salt industrial steam system (11) are newly built on the basis of the electric energy storage fused salt system (8); the molten salt heating system (10) and/or the molten salt industrial steam system (11) are respectively connected in parallel with an original heating power pipeline (13) to be connected with an original external heat demand (14);
The high-temperature molten salt in the electric energy storage molten salt system (8) is pumped into a newly-built molten salt heating system (10) and/or a molten salt industrial steam system (11) through a molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt and water in the newly-built molten salt heating system (10) and/or the molten salt industrial steam system (11) are subjected to heat exchange to generate a heat source, and the generated heat source is supplied into an original external heat demand (14) through a heating power pipeline (13) under the action of the pump, so that external heating and/or industrial steam supply are realized;
Secondly, on the basis of the newly-built green heat supply project, the coal-fired unit is transformed into a standby and green energy storage integrated power station, so that the aim of carbon emission reduction of the coal-fired unit is fulfilled
1) Newly building a fused salt high-temperature high-pressure steam generation system (9) on the basis of the electric energy storage fused salt system (8);
2) The electric energy storage molten salt system (8) is connected with the molten salt high-temperature high-pressure steam generation system (9) and is connected with the coal-fired boiler system (1) of the original coal-fired unit in parallel;
the electric energy storage molten salt system (8) pumps high-temperature molten salt into the molten salt high-temperature high-pressure steam generation system (9) through the molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt and water in the molten salt high-temperature high-pressure steam generation system (9) are subjected to heat exchange to generate high-temperature high-pressure steam for generating electricity;
3) The newly-built fused salt high-temperature high-pressure steam generating system (9) is connected into a steam power generating system (2) of the original coal-fired unit;
the high-temperature high-pressure steam in the fused salt high-temperature high-pressure steam generation system (9) enters the steam power generation system (2) to drive a steam turbine therein to generate power, and the generated power is supplied to an external power grid (4) through a cable (5) and a power transmission and distribution system (3);
Third step, forming a new system
On the premise of meeting the requirements of external heating and/or industrial steam and the emergency starting of combat readiness, the carbon emission reduction target of the coal-fired unit is realized, and the function of the green energy storage power station is newly increased;
Fourthly, newly-added system equipment is closed, the primary coal-fired unit is not influenced to play a combat readiness emergency starting function and meet the primary external heat consumption requirement (14);
The two steps are sequentially carried out in turn, and the first step is a foundation and a precondition; the temperature of the newly-built electric energy storage molten salt system (8) for storing high-temperature molten salt can meet the requirement that the high-temperature high-pressure steam parameters generated in the molten salt high-temperature high-pressure steam generation system (9) can be used for generating electricity, and the quality of the stored high-temperature molten salt can meet the requirements of the external heat requirement (14) and the environment-friendly energy storage power station;
The process route forms a system for reducing carbon emission of medium and small combat readiness and civil heat source coal-fired units, and the formed system comprises: at least one electric energy storage molten salt system (8), at least one molten salt heating system (10) and/or molten salt industrial steam system (11), at least one molten salt high-temperature high-pressure steam generation system (9), at least one coal-fired boiler system (1), at least one steam power generation system (2) and at least one power transmission and distribution system (3);
The electric energy storage molten salt system (8) is connected with the molten salt heating system (10) and/or the molten salt industrial steam system (11) through a molten salt pipeline (12); the electric energy storage molten salt system (8) is connected with the molten salt high-temperature high-pressure steam generation system (9) through a molten salt pipeline (12); the molten salt high-temperature high-pressure steam generation system (9) is connected with the steam power generation system (2) through the main steam pipeline (6) and the water return pipeline (7); the coal-fired boiler system (1) is connected with the steam power generation system (2) through a main steam pipeline (6) and a water return pipeline (7); the molten salt high-temperature high-pressure steam generation system (9) is connected with the coal-fired boiler system (1) in parallel; the main steam pipeline (6) is connected with the water return pipeline (7) in parallel; the steam power generation system (2) is connected with the power transmission and distribution system (3) through a cable (5); the power transmission and distribution system (3) is connected with the electric energy storage molten salt system (8) through a cable (5);
a plurality of electric energy storage molten salt systems (8) are connected in parallel; a plurality of fused salt heating systems (10) and/or fused salt industrial steam systems (11) are connected in parallel; a plurality of fused salt high-temperature high-pressure steam generating systems (9) are connected in parallel; a plurality of coal-fired boiler systems (1) are connected in parallel; a plurality of steam power generation systems (2) are connected in parallel; a plurality of power transmission and distribution systems (3) are connected in parallel;
The electric energy storage molten salt system (8) comprises at least one molten salt electric heater, at least one high-temperature molten salt storage tank and at least one low-temperature molten salt storage tank; the low-temperature molten salt storage tank is connected with the molten salt electric heater through a molten salt pipeline and a molten salt pump; the molten salt electric heater is connected with the high-temperature molten salt storage tank through a molten salt pipeline and a molten salt pump; a plurality of fused salt electric heaters are connected in parallel; a plurality of high-temperature molten salt storage tanks are connected in parallel; a plurality of low-temperature molten salt storage tanks are connected in parallel; providing power for the flow of molten salt through a molten salt pump;
The power transmission and distribution system (3) is connected with an external power grid (4) through a cable (5);
The coal-fired boiler system (1) is connected with an external heat demand (14) through a heating power pipeline (13);
the molten salt heating system (10) and/or the molten salt industrial steam system (11) are/is connected with an external heat demand (14) through a heating power pipeline (13);
The electric energy storage molten salt system (8) and the molten salt high-temperature high-pressure steam generation system (9) are connected together and connected with the coal-fired boiler system (1) in parallel, so that the same function is exerted functionally; the parameters of the generated high-temperature high-pressure steam are consistent with those of the coal-fired boiler system (1);
the parameters of the steam in the main steam pipeline (6) are consistent with those of the coal-fired boiler system (1), and the high-temperature high-pressure steam flows from the fused salt high-temperature high-pressure steam generation system (9) to the steam power generation system (2) to push a steam generator in the steam power generation system to generate power;
The water return pipeline (7) is a plurality of water return pipelines, water vapor and/or condensed water flow in the water return pipelines, and the flowing direction flows from the steam power generation system (2) to the molten salt high-temperature high-pressure water vapor generation system (9); the main steam pipeline (6) and the water return pipeline (7) form a loop for circulating the process water working medium between the molten salt high-temperature high-pressure steam generation system (9) and the steam power generation system (2).
2. The process route for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units according to claim 1, wherein the process route is characterized in that:
The energy source is from the electricity of an external power grid (4), and the electricity of the external power grid (4) is hydroelectric, wind power or photovoltaic electricity.
3. The process route for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units according to claim 1, wherein the process route is characterized in that:
The energy source is from the electricity of an external power grid (4), and the electricity of the external power grid (4) is valley electricity.
4. The process route for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units according to claim 1, wherein the process route is characterized in that:
the fused salt adopts low-melting-point quaternary fused salt, the fused salt has the parameters of melting point of 94 ℃, decomposition temperature of 628 ℃ and heat storage density of 199 kwh/t.
5. The process route for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units according to claim 1, wherein the process route is characterized in that:
The specific implementation and operation process of the system is as follows:
1) When the non-combat readiness emergency is started, the coal-fired boiler system (1) is closed
The method comprises the steps of heating low-temperature molten salt from a low-temperature molten salt storage tank by using green electricity or valley electricity such as hydropower, wind power or photovoltaic electricity from an external power grid (4) through a power transmission and distribution system (3) through a molten salt electric heater, changing the temperature of the low-temperature molten salt from 200 ℃ to 560 ℃ into high-temperature molten salt, pumping the high-temperature molten salt at 560 ℃ into the high-temperature molten salt storage tank through a molten salt pipeline by using a molten salt pump for storage;
When the heat is externally supplied, high-temperature molten salt at 560 ℃ stored in the high-temperature molten salt storage tank enters a molten salt heating system (10) through a molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt exchanges heat with process water in the molten salt heating system (10); after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the process water is changed into water vapor; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline under the action of a molten salt pump, and water vapor enters an external heat utilization requirement (14) through a heating power pipeline (13) under the action of the pump;
When industrial steam is externally supplied, high-temperature molten salt at 560 ℃ stored in a high-temperature molten salt storage tank enters a molten salt industrial steam system (11) through a molten salt pipeline (12) under the action of a molten salt pump, and heat exchange is carried out between the high-temperature molten salt and process water in the molten salt industrial steam system (11); after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the process water is changed into high-temperature medium-pressure water vapor; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline (12) under the action of a molten salt pump, and the water vapor of high-temperature medium-pressure water vapor enters an external heat demand (14) through a heating power pipeline (13) under the action of the pump;
When the function of the green energy storage power station is exerted to externally supply power, high-temperature molten salt at 560 ℃ stored in the high-temperature molten salt storage tank enters a molten salt high-temperature high-pressure steam generation system (9) through a molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt exchanges heat with steam and/or condensed water from a water return pipeline (7) in the molten salt high-temperature high-pressure steam generation system (9); after heat exchange, the high-temperature molten salt at 560 ℃ is changed into low-temperature molten salt at 200 ℃, and the water vapor and/or condensed water from the water return pipeline (7) is changed into high-temperature high-pressure water vapor; the low-temperature molten salt enters a low-temperature molten salt storage tank through a molten salt pipeline (12) under the action of a molten salt pump, high-temperature and high-pressure water vapor enters a steam power generation system (2) through a main steam pipeline (6) to push a turbine generator in the steam power generation system to generate power, and generated water vapor and/or condensed water returns to a molten salt high-temperature and high-pressure water vapor generation system (9) through a water return pipeline (7) under the action of the pump; the electricity generated by the steam power generation system (2) is supplied to an external power grid (4) through a cable (5) and a power transmission and distribution system (3);
2) When combat readiness is started in emergency, the electric energy storage molten salt system (8) is closed
The fused salt heating system (10) and/or the fused salt industrial steam system (11) and the fused salt high-temperature high-pressure steam generating system (9) are in a non-operation state, the coal-fired boiler system (1) is started in an emergency mode, and the steam power generation system (2) and the power transmission and distribution system (3) are operated normally; the coal-fired boiler system (1) adopts heat generated by burning coal dust to exchange heat with water, the external heat demand (14) is met through a heating power pipeline (13), the generated high-temperature and high-pressure steam enters the steam power generation system (2) through a main steam pipeline (6) to push a turbine generator in the steam power generation system to generate power, and the generated steam and/or condensed water returns to the coal-fired boiler system (1) through a water return pipeline (7) under the action of a pump; the electricity generated by the steam power generation system (2) is supplied to an external power grid (4) through a cable (5) and a power transmission and distribution system (3).
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| CN114543059A (en) * | 2022-02-07 | 2022-05-27 | 北京工大环能科技有限公司 | Process route for modifying shutdown coal-fired unit and formed new system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101452412B1 (en) * | 2013-10-22 | 2014-10-23 | 한국에너지기술연구원 | Solar thermal power generation system using single hot molten salt tank |
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| CN205137914U (en) * | 2015-11-03 | 2016-04-06 | 百吉瑞（天津）新能源有限公司 | Industry heating of electric power heating fused salt energy storage |
| CN206469337U (en) * | 2016-12-30 | 2017-09-05 | 百吉瑞（天津）新能源有限公司 | The complementary heating system of a kind of molten salt energy-storage and electric boiler |
| CN114440204A (en) * | 2022-02-07 | 2022-05-06 | 北京工大环能科技有限公司 | Process route for transforming standby coal-electric machine set and formed new system |
| CN114543059A (en) * | 2022-02-07 | 2022-05-27 | 北京工大环能科技有限公司 | Process route for modifying shutdown coal-fired unit and formed new system |
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