CN115076671A - Process route for carbon emission reduction of medium and small-sized combat readiness and civil heat source coal-fired unit and formed new system - Google Patents
Process route for carbon emission reduction of medium and small-sized combat readiness and civil heat source coal-fired unit and formed new system Download PDFInfo
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- CN115076671A CN115076671A CN202210812819.2A CN202210812819A CN115076671A CN 115076671 A CN115076671 A CN 115076671A CN 202210812819 A CN202210812819 A CN 202210812819A CN 115076671 A CN115076671 A CN 115076671A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008569 process Effects 0.000 title claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 31
- 230000009467 reduction Effects 0.000 title claims abstract description 26
- 150000003839 salts Chemical class 0.000 claims abstract description 381
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 238000004146 energy storage Methods 0.000 claims abstract description 58
- 238000010248 power generation Methods 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 52
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 230000005611 electricity Effects 0.000 claims description 47
- 230000009471 action Effects 0.000 claims description 38
- 239000003245 coal Substances 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 10
- 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
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 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 3
- 238000009434 installation Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
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- 238000004134 energy conservation Methods 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 for carbon emission reduction of medium and small-sized combat readiness and civil heat source coal-fired units and a formed new system are disclosed, wherein the process route comprises the following steps: 1) newly building an electric energy storage molten salt system; 2) a newly built molten salt heating system and/or a molten salt industrial steam system; 3) newly building a molten salt high-temperature and high-pressure steam generation system; 4) an electric energy storage molten salt system and a high-temperature high-pressure water vapor generation system are connected in parallel with the original coal-fired boiler system; 5) the high-temperature and high-pressure steam generating system is connected to a steam generating system of the original coal-fired unit; 6) forming a new system; 7) and closing the newly added equipment and starting a 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 and 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 small and medium-sized coal-fired units on the premise of ensuring that the civil heat source demand and the combat readiness emergency starting function are met.
Description
Technical Field
The invention belongs to the technical field of coal-fired unit reconstruction, and particularly relates to a process route for carbon emission reduction of a coal-fired unit with a medium-sized and small-sized combat readiness and a civil heat source and a formed new system.
Background
For a long time, coal power is the main power supply for ensuring the safety of power supply in China. By the end of 2019 years, the coal electric installation of China has 10.4 billion kilowatts and the power generation amount has 4.56 trillion kilowatts, and the coal electric installation respectively accounts for 51.8 percent and 62.2 percent of the total installation and the total power generation amount. At present, the carbon dioxide emission in the power generation and heat supply industry of China accounts for over 40 percent of the national emission, and is a key industry for national carbon dioxide emission.
The power industry is one of the main industries of coal consumption, energy conservation, emission reduction, upgrading and transformation of coal and electricity are deeply implemented, and the coal consumption of thermal power supply is continuously reduced. For a coal-fired unit with the power supply coal consumption of more than 300 g of standard coal/kilowatt hour, the creation conditions are accelerated to implement energy-saving reconstruction, and units which cannot be reconstructed are gradually eliminated and shut down.
However, some small and medium-sized coal-fired units relate to civil heating or industrial steam, are used as the sole coal-fired unit which can not replace a civil heat source in the area, or relate to the function that the emergency starting cannot be guaranteed due to the fact that the combat readiness causes cannot be shut down, if the shut down of the coal-fired units has a large influence on the civil life, or the emergency starting function of the combat readiness is directly influenced, the current government adopts the policy of temporarily exempting from shutting down the small and medium-sized coal-fired units. However, the efficiency of small and medium-sized coal-fired units is low, the coal consumption is high, the carbon emission is relatively large, and the exempted shutdown of the coal-fired units has a large influence on the aim of achieving carbon peak-to-peak carbon neutralization.
The problem of how to realize carbon emission reduction and carbon neutralization of small and medium-sized coal-fired units under the condition of not influencing civil heating or industrial steam requirements and combat readiness emergency starting functions has great social and economic significance.
The invention patent CN114440204A discloses a technical route for transforming a standby coal-electric set and a technical scheme for forming a new system, the new system formed by transforming the coal-electric set by adopting the technical scheme plays a normal starting function of the coal-electric set during the emergency starting period of the coal-electric set, and plays a green energy storage function during the long-term stopping period of the coal-electric set. Although the invention solves the problems of emergency starting and carbon neutralization of combat readiness of small and medium-sized coal-fired units, the invention cannot solve the problem of carbon neutralization on the premise of meeting the requirements of civil heat sources and combat readiness emergency starting because the invention does not relate to the problem of civil heat sources.
Disclosure of Invention
The invention aims to solve the problem of carbon emission reduction of small and medium-sized coal-fired units exempted from shutdown due to combat readiness and civil heat sources at the most economic cost on the premise of meeting the emergency starting requirements of civil heat sources and combat readiness.
The technical scheme of the invention is as follows:
a process route for carbon emission reduction of medium and small-sized combat readiness and civil heat source coal-fired units and a formed new system are characterized in that:
the process route comprises the following steps:
firstly, a green heat supply project is newly built to meet the requirements of civil heat sources
1) Newly building an electric energy storage molten salt system (8);
electricity in an external power grid (4) enters an electricity 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 electricity in the electricity energy storage molten salt system (8), and electric energy is stored in the electricity energy storage molten salt system (8) in a heat mode;
2) a newly built molten salt heating system (10) and/or molten salt industrial steam system (11) is/are arranged on the basis of the electric energy storage molten salt system (8); the molten salt heating system (10) and/or the molten salt industrial steam system (11) are respectively connected in parallel to an original heat distribution 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, 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 to an original external heat demand (14) through a heat 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, and the aim of carbon emission reduction of the coal-fired unit is fulfilled
1) A molten salt high-temperature and high-pressure water vapor generation system (9) is newly built on the basis of the electric energy storage molten salt system (8);
2) an electric energy storage molten salt system (8) and a molten salt high-temperature high-pressure water vapor generation system (9) are connected together and are connected with a coal-fired boiler system (1) of a raw 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 the molten salt pump, and the high-temperature molten salt and water exchange heat in the molten salt high-temperature high-pressure steam generation system (9) to generate high-temperature high-pressure steam for power generation;
3) the newly-built fused salt high-temperature and high-pressure steam generation system (9) is connected to a steam power generation system (2) of the original coal-fired unit;
high-temperature and high-pressure steam in the molten salt high-temperature and high-pressure steam generation system (9) enters the steam power generation system (2) to push a steam turbine in the steam power generation system 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);
thirdly, forming a new system
On the premise of meeting the requirements on external heating and/or industrial steam and emergency start of combat readiness, the carbon emission reduction target of a coal-fired unit is realized, and the functions of a green energy storage power station are newly added;
and fourthly, closing newly-added system equipment, and not influencing the original coal-fired unit to play a combat readiness emergency starting function and meet the original external heat demand (4).
The first 2 steps are sequentially implemented, and the first step is a foundation and a premise; the temperature of the newly-built electric energy storage molten salt system (8) for storing the high-temperature molten salt can meet the requirement that the high-temperature and high-pressure steam parameters generated in the molten salt high-temperature and high-pressure steam generating system (9) meet the requirement for power generation, and the quality of the stored high-temperature molten salt can meet the requirements of external heat utilization requirements (14) and a green energy storage power station.
The new system formed by the method comprises: the system comprises 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 and high-pressure water vapor generation system through a molten salt pipeline; the molten salt high-temperature and high-pressure water vapor 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 water vapor 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; a plurality of molten salt heating systems and/or molten salt industrial steam systems are connected in parallel; a plurality of molten salt high-temperature and high-pressure steam generation systems are connected in parallel; a plurality of coal-fired boiler systems are connected in parallel; a plurality of steam power generation systems are connected in parallel; and a plurality of 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 pipeline.
The molten salt heating system and/or the molten salt industrial steam system are connected with external heat demand through a heating power pipeline.
Further, in the above technical solution, the electric energy storage molten salt system includes 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; the plurality of molten 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 the molten salt through a molten salt pump;
the fused salt is preferably low-melting-point quaternary fused salt, and the fused salt has the parameters of a melting point of 94 ℃, a decomposition temperature of 628 ℃ and a heat storage density of 199 kwh/t.
In the technical scheme, the electric energy storage molten salt system and the molten salt high-temperature and high-pressure water vapor generation system are connected together and connected in parallel with the coal-fired boiler system, and play the same role in function; the parameters of the generated high-temperature and 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 and high-pressure steam flows to the steam power generation system from the molten salt high-temperature and high-pressure steam generation system to push the steam generator to generate power.
In the technical scheme, the water return pipeline can be a plurality of water return pipelines, steam and/or condensed water flow in the water return pipeline, and the flow direction of the steam and/or condensed water flows from the steam power generation system to the fused salt high-temperature high-pressure water steam generation system; the main steam pipeline and the water return pipeline form a loop for circulating the process water working medium between the fused salt high-temperature and high-pressure steam generating system and the steam generating 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 electricity of an external power grid, and the electricity of the external power grid is hydroelectric power, wind power or photovoltaic power; the electricity of the external power grid is green electricity; the electricity of the external grid is the 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 adopting green electricity or valley electricity such as hydropower, wind electricity or photovoltaic electricity from an external power grid through a power transmission and transformation system through a molten salt electric heater, increasing the temperature of the low-temperature molten salt from 200 ℃ to 560 ℃ to form high-temperature molten salt, and pumping the 560 ℃ high-temperature molten salt into the high-temperature molten salt storage tank through a molten salt pipeline by adopting a molten salt pump for storage.
When external heating is performed, high-temperature molten salt stored in a high-temperature molten salt storage tank at 560 ℃ enters a molten salt heating system through a molten salt pipeline under the action of a molten salt pump, and the high-temperature molten salt and process water perform heat exchange 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 steam; the low-temperature molten salt enters the low-temperature molten salt storage tank through the molten salt pipeline under the action of the molten salt pump, and the water vapor enters the external heat demand through the heat distribution pipeline under the action of the pump.
When industrial steam is supplied to the outside, 560 ℃ high-temperature molten salt 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 the high-temperature molten salt and process water exchange heat 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 the low-temperature molten salt storage tank through the molten salt pipeline under the action of the molten salt pump, and the steam of the high-temperature medium-pressure steam enters the external heat demand through the heat distribution pipeline under the action of the pump.
When the function of a green energy storage power station is exerted to supply power to the outside, 560 ℃ high-temperature molten salt stored in a 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 in the molten salt high-temperature high-pressure steam generation system exchanges heat with steam and/or condensate water from a return pipeline; after heat exchange, the 560 ℃ high-temperature fused salt is changed into 200 ℃ low-temperature fused salt, and the water vapor and/or condensed water from the water return pipeline 7 is changed into high-temperature and high-pressure water vapor; the low-temperature molten salt enters the low-temperature molten salt storage tank through the molten salt pipeline under the action of the molten salt pump, high-temperature and high-pressure water vapor enters the steam power generation system through the main steam pipeline to push a turbine generator in the steam power generation system to generate power, and the generated water vapor and/or condensed water returns to the molten salt high-temperature and high-pressure water vapor generation system through the 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 the combat readiness emergency is started, the electric energy storage molten salt system is closed
The molten salt heating system and/or the molten salt industrial steam system and the molten salt high-temperature and high-pressure steam generation system are/is in a non-operation state, the coal-fired boiler system is started in an emergency, and the steam power generation system and the power transmission and distribution system operate normally; the coal-fired boiler system adopts heat generated by burning pulverized coal to exchange heat with water, the requirement of external heat utilization is met through a thermal pipeline, the generated high-temperature and high-pressure steam enters the steam power generation system through the main steam pipeline to push a steam turbine generator in the steam power generation system to generate power, and the generated steam and/or condensate 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 prominent technical effects:
on the premise of meeting the civil heat source demand and the combat readiness emergency starting function, the carbon emission reduction and carbon neutralization target of the small and medium-sized coal-fired unit which is exempted from shutdown due to civil heat source and combat readiness is realized; when the coal-fired unit needs to be started in emergency in combat readiness, the coal-fired unit can be started normally, and the normal external heat demand can be met; the sinking of a large amount of coal-electricity capital is avoided, and the reduction of employment posts in the coal-electricity industry is reduced; the system formed after transformation can absorb water electricity, wind electricity or photovoltaic electricity to become a 'reservoir' of green electricity.
Drawings
FIG. 1 is a schematic structural view of a coal-fired unit before modification.
FIG. 2 is a schematic structural diagram of a new system formed after a coal-fired unit is modified by adopting the technical scheme of the 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 pipeline; 8. an electrical 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 thermal circuit; 14. heat demand for external use.
Detailed Description
The invention is further described with reference to the following figures and detailed description:
fig. 1 is a schematic structural diagram 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 respectively connected with the steam power generation system 2 through a main steam pipeline 6 and a water return pipeline 7; 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 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 molten salt heating system 10 and/or a molten salt industrial steam system 11 through a heat pipeline 13.
The power transmission and transformation system 3 is connected to an external power grid 4 via a cable 5.
The coal-fired boiler system 1 is connected to an external heat demand 14 through a thermal line 13.
Fig. 2 is a schematic structural diagram of a new system formed after a coal-fired unit is modified by adopting the technical scheme of the invention, and the new system formed after modification comprises: the 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 and 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 a molten salt heating system 10 and/or a 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 and high-pressure water vapor generation system 9 through a molten salt pipeline 12; the fused salt high-temperature and high-pressure water vapor 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 fused salt high-temperature high-pressure water vapor 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;
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; the multiple molten salt high-temperature and high-pressure steam generation systems 9 are connected in parallel; a plurality of steam power generation systems 2 are connected in parallel; the plurality of power transmission and distribution systems 3 are connected in parallel.
The power transmission and distribution system 3 is connected to an external power grid 4 via 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 by a thermal pipeline 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 the molten salt is powered by a molten salt pump.
The fused salt preferably adopts low-melting-point quaternary fused salt, and the fused salt has the parameters of 94 ℃ of melting point, 628 ℃ of decomposition temperature and 199 kwh/t of heat storage density; the energy for heating the molten salt adopts hydroelectric power, wind power or photovoltaic power; the energy for heating the molten salt adopts green electricity; the energy for heating the molten salt adopts valley electricity.
The following is concretely explained by taking the technical route for improving carbon emission reduction of 50MW small and medium-sized coal-fired units exempted from shutdown due to civil heat sources and combat readiness reasons and a formed new system as an example:
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 adopting green electricity or 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, increasing the temperature of the low-temperature molten salt from 200 ℃ to 560 ℃ to form high-temperature molten salt, and pumping the high-temperature molten salt of 560 ℃ into the high-temperature molten salt storage tank through a molten salt pipeline by adopting a molten salt pump for storage.
When external heating is performed, 560 ℃ high-temperature molten salt stored in the high-temperature molten salt storage tank enters the molten salt heating system 10 through the molten salt pipeline under the action of the molten salt pump, and the high-temperature molten salt and 20 ℃ process water perform heat exchange 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 the low-temperature molten salt storage tank through the molten salt pipeline under the action of the molten salt pump, and the water vapor at 120 ℃ enters the external heat demand through the heat distribution pipeline under the action of the pump.
When industrial steam is supplied externally, 560 ℃ high-temperature molten salt stored in a high-temperature molten salt storage tank enters the 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 20 ℃ process water in the molten salt industrial steam system 11; after heat exchange, the 560 ℃ high-temperature molten salt is changed into 200 ℃ low-temperature molten salt, the 20 ℃ process water is changed into water vapor with the temperature of 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 steam of the steam with the temperature of 300 ℃ and the pressure of 1.0MPa enters external heat demand through a heat pipeline under the action of the pump.
When the function of the green energy storage power station is exerted to supply power to the outside, 560 ℃ high-temperature molten salt 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 in the molten salt high-temperature high-pressure steam generation system 9 exchanges heat with steam and/or condensate water from the water return pipeline 7; after heat exchange, the 560 ℃ high-temperature fused salt is changed into 200 ℃ low-temperature fused salt, and the steam and/or condensed water from the water return pipeline 7 is changed into steam with the temperature of 540 ℃ and the pressure of 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 turbonator therein to generate power, and the generated water vapor and/or condensed water returns to a molten salt high-temperature high-pressure water vapor generation system 9 through a return pipeline 7 under the action of the pump; electricity generated by the steam power generation system 2 is supplied to the external power grid 4 through the cable 5 and the power transmission and distribution system 3.
2) When the emergency start of combat readiness is carried out, the electric energy storage molten salt system 8 is closed
The molten salt heating system 10 and/or the molten salt industrial steam system 11 and the molten salt high-temperature and high-pressure steam generation system 9 are/is in a non-running state, the coal-fired boiler system 1 is started in an emergency, and the steam power generation system 3 and the power transmission and distribution system 3 run normally; the coal-fired boiler system 1 adopts heat generated by burning pulverized coal to exchange heat with water, the requirement 14 for external heat utilization is met through a thermal pipeline 13, the generated high-temperature and high-pressure steam enters the steam power generation system 2 through the main steam pipeline 6 to push a steam turbine generator therein to generate power, and the generated steam and/or condensate water returns to the coal-fired boiler system 1 through the water return pipeline 7 under the action of a pump; electricity generated by the steam power generation system 2 is supplied to the external power grid 4 through the cable 5 and the power transmission and distribution system 3.
While one embodiment of the present invention has been described in detail, the description is only illustrative of the preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple modifications, equivalent changes and modifications made within the scope of the present invention shall be within the scope of the patent coverage of the present invention.
Claims (10)
1. A process route for carbon emission reduction of coal-fired units of medium and small-sized combat readiness and civil heat sources and a formed new system are characterized in that:
the process route comprises the following steps:
firstly, a green heat supply project is newly built to meet the requirements of civil heat sources
1) Newly building an electric energy storage molten salt system (8);
electricity in an external power grid (4) enters an electricity 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 electricity in the electricity energy storage molten salt system (8), and electric energy is stored in the electricity energy storage molten salt system (8) in a heat mode;
2) a molten salt heating system (10) and/or a molten salt industrial steam system (11) which is newly built on the basis of the electric energy storage molten salt system (8); the molten salt heating system (10) and/or the molten salt industrial steam system (11) are respectively connected in parallel to an original heat distribution 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, 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 to an original external heat demand (14) through a heat 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, and the aim of carbon emission reduction of the coal-fired unit is fulfilled
1) A molten salt high-temperature and high-pressure water vapor generation system (9) is newly built on the basis of the electric energy storage molten salt system (8);
2) an electric energy storage molten salt system (8) and a molten salt high-temperature high-pressure water vapor generation system (9) are connected together and are connected with a coal-fired boiler system (1) of a raw 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 the molten salt pump, and the high-temperature molten salt and water exchange heat in the molten salt high-temperature high-pressure steam generation system (9) to generate high-temperature high-pressure steam for power generation;
3) the newly-built fused salt high-temperature and high-pressure steam generation system (9) is connected to a steam power generation system (2) of the original coal-fired unit;
high-temperature and high-pressure steam in the molten salt high-temperature and high-pressure steam generation system (9) enters the steam power generation system (2) to push a steam turbine in the steam power generation system 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);
thirdly, forming a new system
On the premise of meeting the requirements on external heating and/or industrial steam and emergency start of combat readiness, the carbon emission reduction target of a coal-fired unit is realized, and the functions of a green energy storage power station are newly added;
fourthly, closing newly-added system equipment, and not affecting the original coal-fired unit to play a combat readiness emergency starting function and meet the original external heat demand (4);
the first 2 steps are sequentially implemented, and the first step is a foundation and a premise; the temperature of the newly-built electric energy storage molten salt system (8) for storing the high-temperature molten salt can meet the requirement that the high-temperature and high-pressure steam parameters generated in the molten salt high-temperature and high-pressure steam generating system (9) meet the requirement for power generation, and the quality of the stored high-temperature molten salt can meet the requirements of external heat utilization requirements (14) and a green energy storage power station.
2. A process route for carbon emission reduction of coal-fired units of medium and small-sized combat readiness and civil heat sources and a formed new system are characterized in that:
the new system formed includes: the 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 a molten salt heating system (10) and/or a 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 and high-pressure steam generation system (9) through a molten salt pipeline (12); the fused salt high-temperature and high-pressure water vapor 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 fused salt high-temperature high-pressure water vapor 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);
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 molten salt high-temperature and high-pressure steam generation systems (9) are connected in parallel; a plurality of coal-fired boiler systems (1) are connected in parallel; the plurality of steam power generation systems (2) are connected in parallel; the plurality of power transmission and distribution systems (3) are connected in parallel.
3. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
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; the plurality of molten 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; the flow of the molten salt is powered by a molten salt pump.
4. The process route for carbon emission reduction of medium and small combat readiness and civil heat source coal-fired units and the formed new system according to claim 1 and/or 2 are characterized in that:
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 connected with an external heat demand (14) through a heat distribution pipeline (13).
5. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
the electric energy storage molten salt system (8) is connected with the molten salt high-temperature and high-pressure water vapor generation system (9) and is connected with the coal-fired boiler system (1) in parallel, and the electric energy storage molten salt system and the molten salt high-temperature and high-pressure water vapor generation system play the same role in function; the parameters of the generated high-temperature and high-pressure steam are consistent with or close to those of the coal-fired boiler system (1).
6. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
the parameters of the steam in the main steam pipeline (6) are consistent with or close to those of the coal-fired boiler system (1), and the high-temperature and high-pressure steam flows to the steam power generation system (2) from the molten salt high-temperature and high-pressure steam generation system (9) to push a steam generator in the steam power generation system to generate power;
the water return pipeline (7) can be a plurality of water return pipelines, steam and/or condensed water flow in the water return pipeline, and the flow direction of the steam and/or condensed water flows from the steam power generation system (2) to the fused salt high-temperature high-pressure water steam generation system (9); the main steam pipeline (6) and the return pipeline (7) form a loop for circulating the process water working medium between the fused salt high-temperature and high-pressure steam generation system (9) and the steam power generation system (2).
7. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
the energy source is electricity of an external power grid (4), and the electricity of the external power grid (4) is hydroelectric power, wind power or photovoltaic power; the power of the external power grid (4) is green power.
8. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
the energy source is electricity from an external power grid (4), and the electricity from the external power grid (4) is valley electricity.
9. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
the fused salt is preferably low-melting-point quaternary fused salt, and the fused salt has the parameters of a melting point of 94 ℃, a decomposition temperature of 628 ℃ and a heat storage density of 199 kwh/t.
10. The process route for carbon emission reduction of coal-fired units for medium and small combat readiness and civil heat sources and the formed new system according to claim 1 and/or 2 are characterized in that:
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 (1)
Green electricity or valley electricity such as hydropower, wind electricity or photovoltaic electricity from an external power grid (4) through a power transmission and transformation system (3) is adopted to heat low-temperature molten salt from a low-temperature molten salt storage tank through a molten salt electric heater, the temperature of the low-temperature molten salt is increased from 200 ℃ to 560 ℃ to be changed into high-temperature molten salt, and a molten salt pump is adopted to pump the high-temperature molten salt of 560 ℃ into a high-temperature molten salt storage tank through a molten salt pipeline for storage;
when external heating is performed, high-temperature molten salt stored in a high-temperature molten salt storage tank at 560 ℃ enters a molten salt heating system (10) through a molten salt pipeline (12) 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 (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 steam; 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 enters an external heat demand (14) through a thermal pipeline (13) under the action of the pump;
when industrial steam is supplied to the outside, 560 ℃ high-temperature molten salt 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 the high-temperature molten salt and process water exchange heat 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 steam of high-temperature medium-pressure steam enters an external heat demand (14) through a heating pipeline (13) under the action of the pump;
when the function of a green energy storage power station is exerted to supply power to the outside, 560 ℃ high-temperature molten salt stored in a high-temperature molten salt storage tank enters a molten salt high-temperature high-pressure water vapor generation system (9) through a molten salt pipeline (12) under the action of a molten salt pump, and the high-temperature molten salt in the molten salt high-temperature high-pressure water vapor generation system (9) exchanges heat with water vapor and/or condensed water from a water return pipeline (7); after heat exchange, the 560 ℃ high-temperature fused salt is changed into 200 ℃ low-temperature fused salt, and the steam and/or condensed water from the water return pipeline (7) is changed into high-temperature and high-pressure steam; 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 therein to generate power, and the generated water vapor and/or condensed water returns to a molten salt high-temperature and high-pressure water vapor generation system (9) through a return pipeline (7) under the action of the pump; electricity generated by the steam power generation system (2) is supplied to an external power grid (4) through a cable (5) and the power transmission and distribution system (3);
2) when the combat readiness emergency is started, the electric energy storage fused salt system is closed (8)
The molten salt heating system (10) and/or the molten salt industrial steam system (11) and the molten salt high-temperature and high-pressure steam generation system (9) are/is in a non-running state, the coal-fired boiler system (1) is started in an emergency, and the steam power generation system (2) and the power transmission and distribution system (3) run normally; the coal-fired boiler system (1) adopts heat generated by burning pulverized coal to exchange heat with water, the requirement (14) for external heat utilization is met through a thermal pipeline (13), generated high-temperature and high-pressure steam enters the steam power generation system (2) through the main steam pipeline (6) to push a steam 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 (1) through the 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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| US20160281689A1 (en) * | 2013-10-22 | 2016-09-29 | Jong Kyu Kim | Solar thermal power generation system using single hot molten salt thermal energy storage tank |
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