CN115854321A - Process route for carbon emission reduction of medium and small-sized civil heat source coal-fired units and formed new system - Google Patents
Process route for carbon emission reduction of medium and small-sized civil heat source coal-fired units and formed new system Download PDFInfo
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Abstract
A process route for carbon emission reduction of medium and small-sized 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 high-pressure water vapor generation system; 4) Replacing a coal-fired boiler system of the original coal-fired unit with an electric energy storage molten salt system and a high-temperature and high-pressure steam generation 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) A new system is formed. 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 steam power generation system and a power transmission and distribution system. On the premise of meeting the demand of the civil heat source, the aim of carbon emission reduction of small and medium-sized coal-fired units exempted from being shut down due to the civil heat source is fulfilled; the formed new system can become a green electricity 'reservoir'.
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 medium and small-sized civil heat source coal-fired unit and a formed new system.
Background
For a long time, coal power is a main power supply for ensuring the safety of power supply in China. By the end of 2019, the coal electric installation machine in China has 10.4 billion kilowatts and the power generation amount is 4.56 trillion kilowatts per hour, and the coal electric installation machine and the power generation amount respectively account for 51.8 percent and 62.2 percent of the total installation machine 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, and are used as the sole coal-fired units which can not replace civil heat sources in the areas, if the coal-fired units are shut down, the influence on the civil life is large, and the current government adopts a policy of temporarily exempting from shutting down the small and medium-sized coal-fired units. However, the small and medium-sized coal-fired units have relatively low efficiency, relatively high coal consumption and relatively large carbon emission, and the exempted shutdown of the coal-fired units has relatively large influence on the purpose of realizing the carbon emission reduction.
The problem of how to realize the carbon emission reduction of the small and medium-sized coal-fired units under the condition of not influencing civil heating or industrial steam has great social and economic significance.
The invention patent CN114543059A discloses a technical scheme for modifying a process route for shutting down a coal-fired unit and a formed new system, the technical scheme modifies the shut down coal-fired unit to form the new system, the formed new system does not burn coal any more and is not a coal-fired unit any more, the green energy storage function can be realized, green electricity or valley electricity such as wind power, photovoltaic electricity and the like can be stored, and the method is mainly applied to modification that the shut down is not started any more or the coal-fired unit is dismantled. Although the invention solves the problem of carbon emission reduction of small and medium-sized coal-fired units, the invention cannot solve the problem of carbon emission reduction of small and medium-sized coal-fired units exempted from shutdown due to civil heating or industrial steam because the invention does not relate to civil heat sources
Disclosure of Invention
The invention aims to realize the carbon emission reduction of small and medium-sized coal-fired units at the most economic cost on the premise of solving the problem of civil heating or industrial steam related to exemption of closing the small and medium-sized coal-fired units.
The idea of the invention is that there are many technologies for solving the problems of civil heating or industrial steam, such as transforming a coal-fired boiler into a gas-fired boiler, and using an electric boiler to replace the coal-fired boiler, but these technologies can cause the abandonment or the dismantling of the coal-fired boiler and the steam power generation system of the original coal-fired unit, which results in the waste of a large amount of coal-electricity capital and higher economic cost. If the technical scheme adopted when solving the problems of civil heating or industrial steam, can realize the reutilization of the main equipment system of the original coal-fired unit, thereby realizing the carbon emission reduction of the small and medium-sized coal-fired units, the technical scheme is the most economical.
The technical scheme of the invention is as follows:
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);
the electricity in the external power grid (4) enters the electric energy storage molten salt system (8) through the cable (5), the low-temperature molten salt is heated into high-temperature molten salt under the action of the electricity in the electric energy storage molten salt system (8), and the electric energy is stored in the electric 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/is respectively connected 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 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 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 heating 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 green energy storage power station, and the carbon emission reduction target of the coal-fired unit is realized
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 steam generation system (9) are used for replacing a coal-fired boiler system (1) of a raw coal-fired unit;
high-temperature molten salt in the electric energy storage molten salt system (8) is pumped into the 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 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, the carbon emission reduction target of the coal-fired unit is realized, and meanwhile, the functions of a green energy storage power station are added;
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 and high-pressure steam generation 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 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 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 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 steam generation system functionally play a role of replacing a coal-fired boiler system of a coal-fired unit; 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 or condensed water can flow in the water return pipeline, and the flow direction of the steam or the 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 of the process water working medium circulating between the fused salt high-temperature and 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 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:
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 the 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 560 ℃ high-temperature fused salt is changed into 200 ℃ low-temperature fused salt, and the process water is changed into 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 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 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.
Compared with the prior art, the invention has the following advantages and prominent technical effects:
(1) on the premise of meeting the demand of the civil heat source, the coal-fired boiler is shut down, and the carbon emission reduction target of the small and medium-sized coal-fired unit which is shut down due to exemption of the civil heat source is realized;
(2) 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;
(3) 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 power pipeline; the steam power generation system 2 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 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 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; 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.
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 heat distribution pipeline 13.
The following is concretely explained by taking the technical route for improving the carbon emission reduction of a 50MW small coal-fired unit exempted from shutdown due to civil heat source and a formed new system as an example:
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.
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 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 become 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, 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 560 ℃ high-temperature fused salt is changed into 200 ℃ low-temperature fused salt, and the 20 ℃ process water is changed into 120 ℃ 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 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 to the outside, 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 and 20 ℃ process water exchange heat 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 turbine generator 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 water 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.
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 medium and small-sized 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);
the electricity in the external power grid (4) enters the electric energy storage molten salt system (8) through the cable (5), the low-temperature molten salt is heated into high-temperature molten salt under the action of the electricity in the electric energy storage molten salt system (8), and the electric energy is stored in the electric 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/is respectively connected 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 green energy storage power station, and the carbon emission reduction target of the coal-fired unit is realized
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 steam generation system (9) are used for replacing a coal-fired boiler system (1) of a raw coal-fired unit;
high-temperature molten salt in the electric energy storage molten salt system (8) is pumped into the 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 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;
the high-temperature high-pressure steam in the molten salt high-temperature high-pressure steam generation system (9) enters the steam power generation system (2) to drive 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, the carbon emission reduction target of the coal-fired unit is realized, and meanwhile, the functions of a green energy storage power station are added;
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 parameters of the high-temperature and high-pressure steam generated in the molten salt high-temperature and high-pressure steam generation 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 demand (14) and a green energy storage power station.
2. A process route for carbon emission reduction of medium and small-sized civil heat source coal-fired units and a formed new system are characterized in that:
the new system formed by the method comprises: at least one electrical 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 steam power generation system (2), 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 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 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; 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 small and medium-sized 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).
4. The process route for carbon emission reduction of small and medium-sized civil heat source coal-fired units and the formed new system according to claim 1 and/or 2 are characterized in that:
the molten salt heating system (10) and/or the molten salt industrial steam system (11) is connected to an external heat demand (14) via a thermal line (13).
5. The process route for carbon emission reduction of the medium and small-sized civil heat source coal-fired units and the formed new system 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.
6. The process route for carbon emission reduction of the medium and small-sized civil heat source coal-fired units and the formed new system are characterized in that:
the fused salt preferably adopts 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;
the electric energy storage molten salt system (8) and the molten salt high-temperature and high-pressure steam generation system (9) functionally play a role of replacing a coal-fired boiler system (1) of a coal-fired unit; 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).
7. The process route for carbon emission reduction of the medium and small-sized civil heat source coal-fired units and the formed new system 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 the steam generator to generate electricity;
the water return pipeline (7) can be a plurality of water return pipelines, steam or condensed water flows in the water return pipeline, and the flowing direction of the steam or the condensed water flows from the steam power generation system (2) to the fused salt high-temperature high-pressure steam generation system (9); the main steam pipeline (6) and the return water pipeline (7) form a loop in which the process water working medium circulates between the fused salt high-temperature and high-pressure steam generation system (9) and the steam power generation system (2).
8. The process route for carbon emission reduction of the medium and small-sized civil heat source coal-fired units and the formed new system are characterized in that:
the energy source is the 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 is green power.
9. The process route for carbon emission reduction of the medium and small-sized civil heat source coal-fired units and the formed new system 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.
10. The process route for carbon emission reduction of the medium and small-sized civil heat source coal-fired units and the formed new system are characterized in that:
the specific implementation and operation process of the technical scheme is as follows:
green electricity or valley electricity such as hydropower, wind electricity or photovoltaic electricity and the like 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 become high-temperature molten salt, and a molten salt pump is adopted to pump the high-temperature molten salt at 560 ℃ into a high-temperature molten salt storage tank through a molten salt pipeline (12) 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 (12) under the action of a molten salt pump, and the water vapor enters an external heat demand (14) through a heating power 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 power 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 water return pipeline (7) under the action of the pump; the electricity generated by the steam power generation system is supplied to an external power grid (4) through a cable (5) and a power transmission and distribution system (3).
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