Power generation system

Abstract

The utility model provides a power generation system which comprises a steam generation system and a thermal power generation system. The thermal power generation system comprises a coal-fired boiler, a first water supply system, a steam turbine and a generator; the steam turbine comprises a critical cylinder, a high-pressure cylinder and an intermediate-pressure cylinder; a main steam output end of the coal-fired boiler is connected with a steam input end of a critical cylinder, a steam discharge end of the critical cylinder is connected with a steam input end of a high-pressure cylinder, a steam discharge end of the high-pressure cylinder is connected with a steam input end of a first reheater in the coal-fired boiler, and a steam output end of the first reheater is connected with a steam input end of a medium-pressure cylinder; the steam generation system comprises a heat storage module, a steam generation module and a second water supply system; the steam generation module comprises a preheater, an evaporator, a superheater and a second reheater; the steam discharge end of the high-pressure cylinder is further connected with the steam input end of the second reheater, and the steam output end of the second reheater is connected with the steam input end of the intermediate-pressure cylinder. According to the scheme, the deep peak regulation capacity of the power generation system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation, and in particular to a power generation system. Background Art

[0002] "Carbon peak" and "carbon neutrality" are the current overarching goals of energy development. However, to ensure energy security and energy security, the vigorous development of thermal power generation is still necessary. However, since increasing the scale of thermal power generation will result in greater carbon emissions, reducing the carbon emissions of thermal power generation systems requires increasing their deep peak-shaving capabilities. However, thermal power generation systems are limited by the minimum stable combustion load of coal-fired boilers, generally requiring an operating power of no less than 25% of the rated power. Therefore, how to reduce the carbon emissions of thermal power generation systems while simultaneously improving their deep peak-shaving capabilities presents a new challenge for power generation technology. Utility Model Content

[0003] In response to the defects in the existing technology, the purpose of the present invention is to provide a power generation system. By introducing a steam generation system into an existing or newly built thermal power generation system and at the same time setting up a steam turbine with multi-stage cylinders, the scale of the coal-fired boiler is reduced compared with a pure thermal power generation system of the same scale, and the deep peak-shaving capability and rapid load change capability are improved.

[0004] The utility model provides a power generation system, comprising a steam generation system and a thermal power generation system;

[0005] The thermal power generation system includes a coal-fired boiler, a first water supply system, a steam turbine and a generator;

[0006] The output end of the first water supply system is connected to the water working medium input end of the coal-fired boiler;

[0007] The steam turbine is connected to the generator;

[0008] The steam turbine includes a critical cylinder, a high-pressure cylinder, and an intermediate-pressure cylinder; the main steam output end of the coal-fired boiler is connected to the steam input end of the critical cylinder, the steam discharge end of the critical cylinder is connected to the steam input end of the high-pressure cylinder, the steam discharge end of the high-pressure cylinder is connected to the steam input end of the first reheater in the coal-fired boiler, and the steam output end of the first reheater is connected to the steam input end of the intermediate-pressure cylinder;

[0009] The steam generation system includes a heat storage module, a steam generation module and a second water supply system;

[0010] The steam generation module includes a preheater, an evaporator, a superheater and a second reheater;

[0011] The output end of the second water supply system is connected to the water working medium input end of the preheater, the water working medium output end of the preheater is connected to the water working medium input end of the evaporator, the water working medium output end of the evaporator is connected to the water working medium input end of the superheater, and the superheated steam output end of the superheater is connected to the steam input end of the high-pressure cylinder; the high-temperature heat storage medium output end of the heat storage module is connected to the heat storage medium input end of the superheater, the heat storage medium output end of the superheater is connected to the heat storage medium input end of the evaporator, the heat storage medium output end of the evaporator is connected to the heat storage medium input end of the preheater, and the heat storage medium output end of the preheater is connected to the low-temperature heat storage medium input end of the heat storage module;

[0012] The steam discharge end of the high-pressure cylinder is also connected to the steam input end of the second reheater, and the steam output end of the second reheater is connected to the steam input end of the intermediate-pressure cylinder; the high-temperature heat storage medium output end of the heat storage module is connected to the heat storage medium input end of the second reheater, and the heat storage medium output end of the second reheater is connected to the low-temperature heat storage medium input end of the heat storage module.

[0013] Furthermore,

[0014] The first water supply system includes: a first water supply pump, a first low-pressure heating system, a first deaerator, a first deoxygenated water delivery pump and a first high-pressure heating system;

[0015] The output end of the first feedwater pump is connected to the water working medium input end of the first low-pressure heating system, the water working medium output end of the first low-pressure heating system is connected to the water working medium input end of the first deaerator, the water working medium output end of the first deaerator is connected to the water working medium input end of the first deoxygenated water delivery pump, the water working medium output end of the first deoxygenated water delivery pump is connected to the water working medium input end of the first high-pressure heating system, and the water working medium output end of the first high-pressure heating system is connected to the water working medium input end of the coal-fired boiler;

[0016] The second water supply system includes: a second water supply pump, a second low-pressure heating system, a second deaerator, a second deoxygenated water delivery pump and a second high-pressure heating system;

[0017] The output end of the second feedwater pump is connected to the water working medium input end of the second low-pressure heating system, the water working medium output end of the second low-pressure heating system is connected to the water working medium input end of the second deaerator, the water working medium output end of the second deaerator is connected to the water working medium input end of the second deoxygenated water delivery pump, the water working medium output end of the second deoxygenated water delivery pump is connected to the water working medium input end of the second high-pressure heating system, and the water working medium output end of the second high-pressure heating system is connected to the water working medium input end of the preheater;

[0018] The first water supply pump and the second water supply pump are the same water supply pump, or the first water supply pump and the second water supply pump are two independent water supply pumps;

[0019] The first low-pressure heating system and the second low-pressure heating system are the same low-pressure heating system, or the first low-pressure heating system and the second low-pressure heating system are two independent low-pressure heating systems;

[0020] The first deaerator and the second deaerator are the same deaerator, or the first deaerator and the second deaerator are two independent deaerators.

[0021] Furthermore,

[0022] The extraction steam input end of the first high-pressure heating system is connected to the extraction steam output end of the steam turbine, and the first high-pressure heating system is used to heat the water working medium using the extraction steam of the steam turbine;

[0023] The second high-pressure heating system includes a first high-pressure heating module and a second high-pressure heating module, the water working medium input end of the first high-pressure heating module is connected to the water working medium output end of the second deoxygenated water delivery pump, the water working medium output end of the first high-pressure heating module is connected to the water working medium input end of the second high-pressure heating module, and the water working medium output end of the second high-pressure heating module is connected to the water working medium input end of the preheater;

[0024] The extraction steam input end of the first high-pressure heating module is connected to the extraction steam output end of the steam turbine, and the first high-pressure heating module is used to use the extraction steam of the steam turbine to heat the water working medium; the extraction steam input end of the second high-pressure heating module is connected to the extraction steam output end of the evaporator, and the second high-pressure heating module is used to use the extraction steam of the evaporator to heat the water working medium.

[0025] Furthermore, the steam turbine further comprises a low-pressure cylinder, and the steam discharge end of the intermediate-pressure cylinder is connected to the steam input end of the low-pressure cylinder.

[0026] Further, the first high-pressure heating system includes a first high-pressure heater, a second high-pressure heater and a third high-pressure heater;

[0027] The water working medium input end of the first high-pressure heater is connected to the water working medium output end of the first deoxygenated water delivery pump, the water working medium output end of the first high-pressure heater is connected to the water working medium input end of the second high-pressure heater, the water working medium output end of the second high-pressure heater is connected to the water working medium input end of the third high-pressure heater, and the water working medium output end of the third high-pressure heater is connected to the water working medium input end of the coal-fired boiler;

[0028] The extraction steam input end of the first high-pressure heater is connected to the first extraction steam output end of the intermediate-pressure cylinder, the extraction steam input end of the second high-pressure heater is connected to the extraction steam output end of the high-pressure cylinder, and the extraction steam input end of the third high-pressure heater is connected to the extraction steam output end of the critical cylinder;

[0029] The first high-voltage heating module includes a fourth high-voltage heater, a fifth high-voltage heater, a sixth high-voltage heater, and a seventh high-voltage heater; the second high-voltage heating module includes an eighth high-voltage heater;

[0030] The water working medium input end of the fourth high-pressure heater is connected to the water working medium output end of the second deoxygenated water delivery pump, the water working medium output end of the fourth high-pressure heater is connected to the water working medium input end of the fifth high-pressure heater, the water working medium output end of the fifth high-pressure heater is connected to the water working medium input end of the sixth high-pressure heater, the water working medium output end of the sixth high-pressure heater is connected to the water working medium input end of the seventh high-pressure heater, the water working medium output end of the seventh high-pressure heater is connected to the water working medium input end of the eighth high-pressure heater, and the water working medium output end of the eighth high-pressure heater is connected to the water working medium input end of the preheater;

[0031] The steam extraction input end of the fourth high-pressure heater is connected to the fourth steam extraction output end of the low-pressure cylinder, the steam extraction input end of the fifth high-pressure heater is connected to the first steam extraction output end of the medium-pressure cylinder, the steam extraction input end of the sixth high-pressure heater is connected to the steam extraction output end of the high-pressure cylinder, the steam extraction input end of the seventh high-pressure heater is connected to the steam extraction output end of the critical cylinder, and the steam extraction input end of the eighth high-pressure heater is connected to the steam extraction output end of the evaporator.

[0032] Furthermore, it also includes an exhaust steam condensing device and a condensate tank. The exhaust steam output end of the low-pressure cylinder is connected to the input end of the exhaust steam condensing device, the water working medium output end of the exhaust steam condensing device is connected to the water working medium input end of the condensate tank, and the water working medium output end of the condensate tank is connected to the water working medium input end of the first water supply pump and the water working medium input end of the second water supply pump.

[0033] Further, the first low-pressure heating system includes a first low-pressure heater, a second low-pressure heater and a third low-pressure heater;

[0034] The water working medium input end of the first low-pressure heater is connected to the output end of the first feedwater pump, the water working medium output end of the first low-pressure heater is connected to the water working medium input end of the second low-pressure heater, the water working medium output end of the second low-pressure heater is connected to the water working medium input end of the third low-pressure heater, and the water working medium output end of the third low-pressure heater is connected to the water working medium input end of the first deaerator;

[0035] The extraction steam input end of the first low-pressure heater is connected to the first extraction steam output end of the low-pressure cylinder, the extraction steam input end of the second low-pressure heater is connected to the second extraction steam output end of the low-pressure cylinder, and the extraction steam input end of the third low-pressure heater is connected to the third extraction steam output end of the low-pressure cylinder;

[0036] The second low-pressure heating system includes a fourth low-pressure heater, a fifth low-pressure heater, and a sixth low-pressure heater;

[0037] The water working medium input end of the fourth low-pressure heater is connected to the water working medium output end of the second feed water pump, the water working medium output end of the fourth low-pressure heater is connected to the water working medium input end of the fifth low-pressure heater, the water working medium output end of the fifth low-pressure heater is connected to the water working medium input end of the sixth low-pressure heater, and the water working medium output end of the sixth low-pressure heater is connected to the water working medium input end of the second deaerator;

[0038] The steam extraction input end of the fourth low-pressure heater is connected to the first steam extraction output end of the low-pressure cylinder, the steam extraction input end of the fifth low-pressure heater is connected to the second steam extraction output end of the low-pressure cylinder, and the steam extraction input end of the sixth low-pressure heater is connected to the third steam extraction output end of the low-pressure cylinder.

[0039] Furthermore, the steam extraction input end of the first deaerator is connected to the second steam extraction output end of the intermediate pressure cylinder, and the steam extraction input end of the second deaerator is connected to the second steam extraction output end of the intermediate pressure cylinder.

[0040] Furthermore,

[0041] The hydrophobic output end of the eighth high-pressure heater is connected to the hydrophobic input end of the seventh high-pressure heater, the hydrophobic output end of the seventh high-pressure heater is connected to the hydrophobic input end of the sixth high-pressure heater, the hydrophobic output end of the sixth high-pressure heater is connected to the hydrophobic input end of the fifth high-pressure heater, the hydrophobic output end of the fifth high-pressure heater is connected to the hydrophobic input end of the fourth high-pressure heater, and the hydrophobic output end of the fourth high-pressure heater is connected to the hydrophobic input end of the second deaerator.

[0042] Furthermore,

[0043] The main steam output end of the coal-fired boiler is connected to the steam input end of the critical cylinder through a fifth pipeline, and a fifth pipeline isolation valve is provided on the fifth pipeline;

[0044] The steam discharge end of the high-pressure cylinder is connected to the steam input end of the first reheater in the coal-fired boiler through a high-pressure cylinder exhaust pipeline and a first high-pressure cylinder exhaust pipeline branch, and a first high-pressure cylinder exhaust pipeline branch isolation valve is provided on the first high-pressure cylinder exhaust pipeline branch;

[0045] The steam output end of the first reheater is connected with the steam input end of the intermediate pressure cylinder through a sixth pipeline, and a sixth pipeline isolation valve is arranged on the sixth pipeline;

[0046] The superheated steam output end of the superheater is connected with the steam input end of the high pressure cylinder through a first pipeline, and a first pipeline isolation valve is arranged on the first pipeline;

[0047] The steam discharge end of the high pressure cylinder is connected with the steam input end of the second reheater through the high pressure cylinder exhaust pipeline and a second high pressure cylinder exhaust pipeline branch in sequence, and a second high pressure cylinder exhaust pipeline branch isolation valve is arranged on the second high pressure cylinder exhaust pipeline branch;

[0048] The steam output end of the second reheater is connected with the steam input end of the intermediate pressure cylinder through a second pipeline, and a second pipeline isolation valve is arranged on the second pipeline.

[0049] Further,

[0050] The steam extraction input end of the first high pressure heater is connected with the first steam extraction output end of the intermediate pressure cylinder through a first intermediate pressure cylinder steam extraction pipeline, the steam extraction input end of the second high pressure heater is connected with the steam extraction output end of the high pressure cylinder through a high pressure cylinder steam extraction pipeline, and the steam extraction input end of the third high pressure heater is connected with the steam extraction output end of the critical cylinder through a critical cylinder steam extraction pipeline; wherein a first intermediate pressure cylinder steam extraction pipeline isolation valve is arranged on the first intermediate pressure cylinder steam extraction pipeline, a high pressure cylinder steam extraction pipeline isolation valve is arranged on the high pressure cylinder steam extraction pipeline, and a critical cylinder steam extraction pipeline isolation valve is arranged on the critical cylinder steam extraction pipeline;

[0051] The steam extraction input end of the fourth high pressure heater is connected with the fourth steam extraction output end of the low pressure cylinder through a first low pressure cylinder steam extraction pipeline, the steam extraction input end of the fifth high pressure heater is connected with the first steam extraction output end of the intermediate pressure cylinder through the first intermediate pressure cylinder steam extraction pipeline and an intermediate pressure cylinder steam extraction pipeline branch in sequence, the steam extraction input end of the sixth high pressure heater is connected with the steam extraction output end of the high pressure cylinder through the high pressure cylinder steam extraction pipeline and a high pressure cylinder steam extraction pipeline branch in sequence, the steam extraction input end of the seventh high pressure heater is connected with the steam extraction output end of the critical cylinder through the critical cylinder steam extraction pipeline and a critical cylinder steam extraction pipeline branch in sequence, and the steam extraction input end of the eighth high pressure heater is connected with the steam extraction output end of the evaporator through a third pipeline; wherein a first low pressure cylinder steam extraction pipeline isolation valve is arranged on the first low pressure cylinder steam extraction pipeline, an intermediate pressure cylinder steam extraction pipeline branch isolation valve is arranged on the intermediate pressure cylinder steam extraction pipeline branch, a high pressure cylinder steam extraction pipeline branch isolation valve is arranged on the high pressure cylinder steam extraction pipeline branch, a critical cylinder steam extraction pipeline branch isolation valve is arranged on the critical cylinder steam extraction pipeline branch, and a third pipeline isolation valve is arranged on the third pipeline.

[0052] The drain output end of the fourth high-pressure heater is connected to the drain input end of the second deaerator through a first drain pipeline, and a first drain pipeline isolation valve is provided on the first drain pipeline.

[0053] Furthermore, the heat storage medium in the heat storage module is heated by a tower solar thermal collection system; or,

[0054] The heat storage medium in the heat storage module is heated by an electric heater, and the electric energy required by the electric heater comes from a photovoltaic power generation system or a wind power generation system.

[0055] Furthermore, the heat storage medium in the heat storage module is molten salt.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] 1. In existing thermal power generation systems, a large amount of coal is consumed and a large amount of carbon emissions are generated in order to maintain the normal operation of the thermal power generation system. The utility model proposes a power generation system that uses a steam generation system (such as a molten salt steam generation system) and a coal-fired boiler to jointly provide the required energy for the steam turbine generator set in the entire power generation system. Compared with a pure thermal power generation system of the same scale, it can effectively reduce the scale of the coal-fired boiler, thereby effectively reducing the consumption of coal and reducing carbon emissions.

[0058] 2. During actual operation, power generation systems must follow the grid's dispatch instructions and participate in peak load regulation. Existing thermal power generation systems achieve peak load regulation by reducing the output load from coal-fired boilers to steam turbine generator sets. However, due to their inherent characteristics, coal-fired boilers have a minimum stable combustion load requirement (i.e., below this minimum stable combustion load, the coal in the boiler cannot burn stably). Therefore, the peak load regulation capability of a purely thermal power generation system is limited. In the power generation system provided by the present invention, the output load of the steam generation system to the steam turbine can reach a minimum of zero (i.e., the steam generation system does not output steam to the steam turbine generator set), and the size of the coal-fired boiler in the present invention can be reduced due to the introduction of the steam generation system into the power generation system. Therefore, the minimum output load of the power generation system in the present invention to the power grid can be further reduced compared to a purely thermal power generation system of the same size, thereby improving the deep peak-shaving capability of the power generation system of the present invention. At the same time, the energy in the steam generation system is derived from renewable energy (such as clean energy provided by solar or wind energy, and further, for example, the heat storage medium in the heat storage module is heated by a tower solar thermal system, or the heat storage medium in the heat storage module is heated by an electric heater, and the electricity required for the electric heater is derived from a photovoltaic power generation system or a wind power generation system). Therefore, compared with a thermal power generation system of the same size, carbon emissions can be effectively reduced. In addition, the steam generation system has the ability to rapidly change loads, thereby improving the rapid load change capability of the power generation system.

[0059] 3. Since the main steam parameters produced by the coal-fired boiler do not match the steam parameters produced by the steam generation system (such as the molten salt steam generation system), they cannot be directly connected to the same steam turbine. The utility model configures a steam turbine including multi-stage cylinders. By respectively connecting the main steam produced by the coal-fired boiler and the steam produced by the steam generation system (such as the molten salt steam generation system) to the cylinders in the same steam turbine that match the steam parameters, one steam turbine can adapt to steam of different parameters at the same time, without the need to set up two steam turbines, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0061] Figure 1 A schematic structural diagram of a power generation system provided in an embodiment of the present utility model.

[0062] In the picture:

[0063] 11. Preheater; 12. Evaporator; 13. Superheater; 14. Second reheater;

[0064] 21, critical cylinder; 22, high pressure cylinder; 23, intermediate pressure cylinder; 24, low pressure cylinder;

[0065] 25, generator;

[0066] 26, exhaust condensing device;

[0067] 30, condensate tank; 40, condensate pump;

[0068] 51, first low pressure heater; 52, second low pressure heater; 53, third low pressure heater;

[0069] 60, deaerator;

[0070] 71, first deaerated water delivery pump; 72, second deaerated water delivery pump;

[0071] 81, first high pressure heater; 82, second high pressure heater; 83, third high pressure heater;

[0072] 84, fourth high pressure heater; 85, fifth high pressure heater; 86, sixth high pressure heater; 87, seventh high pressure heater; 88, eighth high pressure heater;

[0073] 90, coal-fired boiler;

[0074] 110, first line; 111, first line isolation valve;

[0075] 120, second line; 121, second line isolation valve;

[0076] 130, third line; 131, third line isolation valve;

[0077] 210, critical cylinder extraction line; 211, critical cylinder extraction line branch isolation valve; 212, critical cylinder extraction line branch; 218, critical cylinder exhaust line;

[0078] 221, high pressure cylinder extraction line; 222, high pressure cylinder extraction line branch isolation valve; 223, high pressure cylinder extraction line branch;

[0079] 225, high pressure cylinder exhaust line;

[0080] 226, first high pressure cylinder exhaust line branch; 227, second high pressure cylinder exhaust line branch isolation valve; 228, second high pressure cylinder exhaust line branch;

[0081] 230, first intermediate pressure cylinder extraction line; 231, intermediate pressure cylinder extraction line branch isolation valve; 232, intermediate pressure cylinder extraction line branch;

[0082] 235, second intermediate pressure cylinder extraction line;

[0083] 238. Intermediate pressure cylinder exhaust pipe;

[0084] 240, low-pressure cylinder exhaust pipe;

[0085] 242, first low-pressure cylinder steam extraction pipeline isolation valve; 243, first low-pressure cylinder steam extraction pipeline; 245, second low-pressure cylinder steam extraction pipeline; 246, third low-pressure cylinder steam extraction pipeline; 247, fourth low-pressure cylinder steam extraction pipeline;

[0086] 611, fourth pipeline isolation valve; 612, fourth pipeline;

[0087] 830, first water supply pipeline;

[0088] 841, first drain pipeline; 842, first drain pipeline isolation valve; 851, second drain pipeline; 861, third drain pipeline; 871, fourth drain pipeline;

[0089] 880, second water supply pipeline;

[0090] 881, the fifth drain line;

[0091] 910, the fifth pipeline;

[0092] 920, the sixth pipeline. DETAILED DESCRIPTION

[0093] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various variations and improvements without departing from the scope of the present invention. Such variations and improvements are all within the scope of protection of the present invention.

[0094] See also Figure 1 , an embodiment of the present application provides a power generation system, including a steam generation system and a thermal power generation system;

[0095] The thermal power generation system includes a coal-fired boiler 90, a first water supply system, a steam turbine and a generator 25;

[0096] The output end of the first water supply system is connected to the water working medium input end of the coal-fired boiler 90;

[0097] The steam turbine is connected to the generator 25;

[0098] The steam turbine comprises a critical cylinder 21, a high-pressure cylinder 22 and a medium-pressure cylinder 23; a main steam output end of the coal-fired boiler 90 is connected with a steam input end of the critical cylinder 21, a steam discharge end of the critical cylinder 21 is connected with a steam input end of the high-pressure cylinder 22, a steam discharge end of the high-pressure cylinder 22 is connected with a steam input end of a first reheater in the coal-fired boiler 90, and a steam output end of the first reheater is connected with a steam input end of the medium-pressure cylinder 23;

[0099] The steam generation system comprises a heat storage module (not shown in the figure), a steam generation module and a second feedwater system;

[0100] The steam generation module comprises a preheater 11, an evaporator 12, a superheater 13 and a second reheater 14;

[0101] A water working medium output end of the second feedwater system is connected with a water working medium input end of the preheater 11, a water working medium output end of the preheater 11 is connected with a water working medium input end of the evaporator 12, a water working medium output end of the evaporator 12 is connected with a water working medium input end of the superheater 13, and a superheated steam output end of the superheater 13 is connected with a steam input end of the high-pressure cylinder 22; a high-temperature heat storage medium output end of the heat storage module is connected with a heat storage medium input end of the superheater 13, a heat storage medium output end of the superheater 13 is connected with a heat storage medium input end of the evaporator 12, a heat storage medium output end of the evaporator 12 is connected with a heat storage medium input end of the preheater 11, and a heat storage medium output end of the preheater 11 is connected with a low-temperature heat storage medium input end of the heat storage module;

[0102] A steam discharge end of the high-pressure cylinder 22 is also connected with a steam input end of the second reheater 14, and a steam output end of the second reheater 14 is connected with a steam input end of the medium-pressure cylinder 23; a high-temperature heat storage medium output end of the heat storage module is connected with a heat storage medium input end of the second reheater 14, and a heat storage medium output end of the second reheater 14 is connected with a low-temperature heat storage medium input end of the heat storage module.

[0103] In the embodiment, the heat storage module comprises a low-temperature heat storage unit for storing low-temperature heat storage medium and a high-temperature heat storage unit for storing high-temperature heat storage medium, and in the embodiment, the low-temperature heat storage unit is a low-temperature storage tank, and the high-temperature heat storage unit is a high-temperature storage tank; of course, in other embodiments, the low-temperature heat storage unit and the high-temperature heat storage unit can also be two independent spaces separated from each other in one storage tank.

[0104] In a specific embodiment,

[0105] The first feedwater system comprises a first feedwater pump, a first low-pressure heating system, a first deaerator, a first deaerated water delivery pump 71 and a first high-pressure heating system;

[0106] The output end of the first feedwater pump is connected to the water working medium input end of the first low-pressure heating system, the water working medium output end of the first low-pressure heating system is connected to the water working medium input end of the first deaerator, the water working medium output end of the first deaerator is connected to the water working medium input end of the first deoxygenated water delivery pump 71, the water working medium output end of the first deoxygenated water delivery pump 71 is connected to the water working medium input end of the first high-pressure heating system, and the water working medium output end of the first high-pressure heating system is connected to the water working medium input end of the coal-fired boiler 90;

[0107] The second water supply system includes: a second water supply pump, a second low-pressure heating system, a second deaerator, a second deoxygenated water delivery pump 72 and a second high-pressure heating system;

[0108] The output end of the second feedwater pump is connected to the water working medium input end of the second low-pressure heating system, the water working medium output end of the second low-pressure heating system is connected to the water working medium input end of the second deaerator, the water working medium output end of the second deaerator is connected to the water working medium input end of the second deoxygenated water delivery pump 72, the water working medium output end of the second deoxygenated water delivery pump 72 is connected to the water working medium input end of the second high-pressure heating system, and the water working medium output end of the second high-pressure heating system is connected to the water working medium input end of the preheater 11;

[0109] The extraction steam input end of the first high-pressure heating system is connected to the extraction steam output end of the steam turbine, and the first high-pressure heating system is used to heat the water working medium using the extraction steam of the steam turbine;

[0110] The second high-pressure heating system includes a first high-pressure heating module and a second high-pressure heating module. The water working medium input end of the first high-pressure heating module is connected to the water working medium output end of the second deoxygenated water delivery pump 72. The water working medium output end of the first high-pressure heating module is connected to the water working medium input end of the second high-pressure heating module. The water working medium output end of the second high-pressure heating module is connected to the water working medium input end of the preheater 11.

[0111] The extraction steam input end of the first high-pressure heating module is connected to the extraction steam output end of the steam turbine, and the first high-pressure heating module is used to heat the water working medium using the extraction steam of the steam turbine; the extraction steam input end of the second high-pressure heating module is connected to the extraction steam output end of the evaporator 12, and the second high-pressure heating module is used to heat the water working medium using the extraction steam of the evaporator 12;

[0112] The steam turbine also includes a low-pressure cylinder 24, and the steam discharge end of the intermediate-pressure cylinder 23 is connected to the steam input end of the low-pressure cylinder 24;

[0113] The first high-pressure heating system includes a first high-pressure heater 81, a second high-pressure heater 82 and a third high-pressure heater 83;

[0114] The water working medium input end of the first high-pressure heater 81 is connected to the water working medium output end of the first deoxygenated water delivery pump 71, the water working medium output end of the first high-pressure heater 81 is connected to the water working medium input end of the second high-pressure heater 82, the water working medium output end of the second high-pressure heater 82 is connected to the water working medium input end of the third high-pressure heater 83, and the water working medium output end of the third high-pressure heater 83 is connected to the water working medium input end of the coal-fired boiler 90;

[0115] The extraction steam input end of the first high-pressure heater 81 is connected to the first extraction steam output end of the intermediate-pressure cylinder 23, the extraction steam input end of the second high-pressure heater 82 is connected to the extraction steam output end of the high-pressure cylinder 22, and the extraction steam input end of the third high-pressure heater 83 is connected to the extraction steam output end of the critical cylinder 21;

[0116] The first high-voltage heating module includes a fourth high-voltage heater 84, a fifth high-voltage heater 85, a sixth high-voltage heater 86 and a seventh high-voltage heater 87; the second high-voltage heating module includes an eighth high-voltage heater 88;

[0117] The water working medium input end of the fourth high-pressure heater 84 is connected to the water working medium output end of the second deoxygenated water delivery pump 72, the water working medium output end of the fourth high-pressure heater 84 is connected to the water working medium input end of the fifth high-pressure heater 85, the water working medium output end of the fifth high-pressure heater 85 is connected to the water working medium input end of the sixth high-pressure heater 86, the water working medium output end of the sixth high-pressure heater 86 is connected to the water working medium input end of the seventh high-pressure heater 87, the water working medium output end of the seventh high-pressure heater 87 is connected to the water working medium input end of the eighth high-pressure heater 88, and the water working medium output end of the eighth high-pressure heater 88 is connected to the water working medium input end of the preheater 11;

[0118] The extraction steam input end of the fourth high-pressure heater 84 is connected to the fourth extraction steam output end of the low-pressure cylinder 24, the extraction steam input end of the fifth high-pressure heater 85 is connected to the first extraction steam output end of the intermediate-pressure cylinder 23, the extraction steam input end of the sixth high-pressure heater 86 is connected to the extraction steam output end of the high-pressure cylinder 22, the extraction steam input end of the seventh high-pressure heater 87 is connected to the extraction steam output end of the critical cylinder 21, and the extraction steam input end of the eighth high-pressure heater 88 is connected to the extraction steam output end of the evaporator 12;

[0119] The power generation system in this embodiment further includes an exhaust steam condensing device 26 and a condensate tank 30. The exhaust steam output end of the low-pressure cylinder 24 is connected to the input end of the exhaust steam condensing device 26. The water working medium output end of the exhaust steam condensing device 26 is connected to the water working medium input end of the condensate tank 30. The water working medium output end of the condensate tank 30 is connected to the water working medium input end of the first feed water pump and the water working medium input end of the second feed water pump.

[0120] The first low-pressure heating system includes a first low-pressure heater 51, a second low-pressure heater 52 and a third low-pressure heater 53;

[0121] The water working medium input end of the first low-pressure heater 51 is connected with the output end of the first feed water pump, the water working medium output end of the first low-pressure heater 51 is connected with the water working medium input end of the second low-pressure heater 52, the water working medium output end of the second low-pressure heater 52 is connected with the water working medium input end of the third low-pressure heater 53, and the water working medium output end of the third low-pressure heater 53 is connected with the water working medium input end of the first deaerator;

[0122] The steam extraction input end of the first low-pressure heater 51 is connected with the first steam extraction output end of the low-pressure cylinder 24, the steam extraction input end of the second low-pressure heater 52 is connected with the second steam extraction output end of the low-pressure cylinder 24, and the steam extraction input end of the third low-pressure heater 53 is connected with the third steam extraction output end of the low-pressure cylinder 24;

[0123] The second low-pressure heating system comprises a fourth low-pressure heater, a fifth low-pressure heater and a sixth low-pressure heater;

[0124] The water working medium input end of the fourth low-pressure heater is connected with the water working medium output end of the second feed water pump, the water working medium output end of the fourth low-pressure heater is connected with the water working medium input end of the fifth low-pressure heater, the water working medium output end of the fifth low-pressure heater is connected with the water working medium input end of the sixth low-pressure heater, and the water working medium output end of the sixth low-pressure heater is connected with the water working medium input end of the second deaerator;

[0125] The steam extraction input end of the fourth low-pressure heater is connected with the first steam extraction output end of the low-pressure cylinder 24, the steam extraction input end of the fifth low-pressure heater is connected with the second steam extraction output end of the low-pressure cylinder 24, and the steam extraction input end of the sixth low-pressure heater is connected with the third steam extraction output end of the low-pressure cylinder 24;

[0126] The steam extraction input end of the first deaerator is connected with the second steam extraction output end of the intermediate-pressure cylinder 23, and the steam extraction input end of the second deaerator is connected with the second steam extraction output end of the intermediate-pressure cylinder 23;

[0127] The drain output end of the eighth high-pressure heater 88 is connected with the drain input end of the seventh high-pressure heater 87, the drain output end of the seventh high-pressure heater 87 is connected with the drain input end of the sixth high-pressure heater 86, the drain output end of the sixth high-pressure heater 86 is connected with the drain input end of the fifth high-pressure heater 85, the drain output end of the fifth high-pressure heater 85 is connected with the drain input end of the fourth high-pressure heater 84, and the drain output end of the fourth high-pressure heater 84 is connected with the drain input end of the second deaerator.

[0128] The first feed water pump and the second feed water pump are the same feed water pump, or the first feed water pump and the second feed water pump are two independent feed water pumps;

[0129] The first low-pressure heating system and the second low-pressure heating system are the same low-pressure heating system, or the first low-pressure heating system and the second low-pressure heating system are two independent low-pressure heating systems;

[0130] The first deaerator and the second deaerator are the same deaerator, or the first deaerator and the second deaerator are two independent deaerators;

[0131] Each device or structure is connected by a pipeline, and each pipeline is equipped with an isolation valve as required;

[0132] The heat in the heat storage module comes from renewable energy; the renewable energy is preferably solar energy or wind energy; specifically, the heat storage medium in the heat storage module is heated by a tower solar thermal collection system; or, the heat storage medium in the heat storage module is heated by an electric heater, and the electric energy required for the electric heater comes from a photovoltaic power generation system or a wind power generation system.

[0133] Preferably, the critical cylinder 21 is a single-cylinder design, and the high-pressure cylinder 22, the medium-pressure cylinder 23 and the low-pressure cylinder 24 can all be single-cylinder or double-cylinder designs.

[0134] In an optional embodiment, the first feedwater pump and the second feedwater pump are the same feedwater pump, the first low-pressure heating system and the second low-pressure heating system are the same low-pressure heating system, and the first deaerator and the second deaerator are the same deaerator;

[0135] The heat storage medium in the heat storage module is heated by a tower solar thermal collection system. The tower solar thermal collection system includes a heliostat field and a heat absorber. The low-temperature heat storage medium output end of the heat storage module is connected to the heat storage medium input end of the heat absorber, and the heat storage medium output end of the heat absorber is connected to the high-temperature heat storage medium input end of the heat storage module. The heat absorber is used to heat the low-temperature heat storage medium in the heat absorber to a high-temperature heat storage medium using sunlight reflected by the heliostat field. The steam generation system uses a molten salt steam generation system, and the heat storage module uses a molten salt heat storage module. That is, the heat storage medium in the heat storage module is molten salt (a molten state of an inorganic salt, such as a molten state of a mixture of sodium nitrate and potassium nitrate).

[0136] The main steam output end of the coal-fired boiler 90 is connected to the steam input end of the critical cylinder 21 through a fifth pipeline 910, and a fifth pipeline isolation valve is provided on the fifth pipeline 910;

[0137] The steam exhaust end of the critical cylinder 21 is connected to the steam input end of the high-pressure cylinder 22 through the critical cylinder exhaust pipe 218. The critical cylinder exhaust pipe 218 is provided with a critical cylinder exhaust pipe isolation valve.

[0138] The steam exhaust end of the high-pressure cylinder 22 is connected to the steam input end of the first reheater in the coal-fired boiler 90 via a high-pressure cylinder exhaust pipe 225 and a first high-pressure cylinder exhaust pipe branch 226. A first high-pressure cylinder exhaust pipe branch isolation valve is provided on the first high-pressure cylinder exhaust pipe branch 226.

[0139] The steam output end of the first reheater is connected to the steam input end of the intermediate pressure cylinder 23 through the sixth pipeline 920. The sixth pipeline 920 is provided with a sixth pipeline isolation valve;

[0140] The superheated steam output end of the superheater 13 is connected to the steam input end of the high-pressure cylinder 22 through a first pipeline 110. A first pipeline isolation valve 111 is provided on the first pipeline 110.

[0141] The steam exhaust end of the high-pressure cylinder 22 is connected to the steam input end of the second reheater 14 through the high-pressure cylinder exhaust pipe 225 and the second high-pressure cylinder exhaust pipe branch 228 in sequence. The second high-pressure cylinder exhaust pipe branch 228 is provided with a second high-pressure cylinder exhaust pipe branch isolation valve 227;

[0142] The steam output end of the second reheater 14 is connected to the steam input end of the intermediate pressure cylinder 23 through a second pipeline 120. A second pipeline isolation valve 121 is provided on the second pipeline 120.

[0143] The steam discharge end of the intermediate pressure cylinder 23 is connected to the steam input end of the low pressure cylinder 24 through the intermediate pressure cylinder exhaust pipe 238. The intermediate pressure cylinder exhaust pipe 238 is provided with an intermediate pressure cylinder exhaust pipe isolation valve.

[0144] The exhaust steam output end of the low-pressure cylinder 24 is connected to the input end of the exhaust steam condensing device 26 through the low-pressure cylinder exhaust steam pipeline 240. The low-pressure cylinder exhaust steam pipeline isolation valve is provided on the low-pressure cylinder exhaust steam pipeline 240.

[0145] The extraction steam input end of the first low-pressure heater 51 is connected to the first extraction steam output end of the low-pressure cylinder 24 via the fourth low-pressure cylinder extraction steam pipeline 247. The extraction steam input end of the second low-pressure heater 52 is connected to the second extraction steam output end of the low-pressure cylinder 24 via the third low-pressure cylinder extraction steam pipeline 246. The extraction steam input end of the third low-pressure heater 53 is connected to the third extraction steam output end of the low-pressure cylinder 24 via the second low-pressure cylinder extraction steam pipeline 245. A fourth low-pressure cylinder extraction steam pipeline isolation valve is provided on the fourth low-pressure cylinder extraction steam pipeline 247, a third low-pressure cylinder extraction steam pipeline isolation valve is provided on the third low-pressure cylinder extraction steam pipeline 246, and a second low-pressure cylinder extraction steam pipeline isolation valve is provided on the second low-pressure cylinder extraction steam pipeline 245.

[0146] The extraction steam input end of the first high-pressure heater 81 is connected to the first extraction steam output end of the intermediate-pressure cylinder 23 via the first intermediate-pressure cylinder extraction steam pipeline 230. The extraction steam input end of the second high-pressure heater 82 is connected to the extraction steam output end of the high-pressure cylinder 22 via the high-pressure cylinder extraction steam pipeline 221. The extraction steam input end of the third high-pressure heater 83 is connected to the extraction steam output end of the critical cylinder 21 via the critical cylinder extraction steam pipeline 210. A first intermediate-pressure cylinder extraction steam pipeline isolation valve is provided on the first intermediate-pressure cylinder extraction steam pipeline 230, a high-pressure cylinder extraction steam pipeline isolation valve is provided on the high-pressure cylinder extraction steam pipeline 221, and a critical cylinder extraction steam pipeline isolation valve is provided on the critical cylinder extraction steam pipeline 210.

[0147] The steam extraction input end of the fourth high-pressure heater 84 is connected to the fourth steam extraction output end of the low-pressure cylinder 24 through the first low-pressure cylinder steam extraction pipeline 243. The steam extraction input end of the fifth high-pressure heater 85 is connected to the first steam extraction output end of the intermediate-pressure cylinder 23 through the first intermediate-pressure cylinder steam extraction pipeline 230 and the intermediate-pressure cylinder steam extraction pipeline branch 232. The steam extraction input end of the sixth high-pressure heater 86 is connected to the steam extraction output end of the high-pressure cylinder 22 through the high-pressure cylinder steam extraction pipeline 221 and the high-pressure cylinder steam extraction pipeline branch 223. The steam extraction input end of the seventh high-pressure heater 87 is connected to the steam extraction output end of the critical cylinder 210 and the critical cylinder steam extraction pipeline branch 212. The extraction steam output end of the critical cylinder 21 is connected to the extraction steam input end of the eighth high-pressure heater 88, and the extraction steam output end of the evaporator 12 is connected via the third pipeline 130. A first low-pressure cylinder extraction steam pipeline isolation valve 242 is provided on the first low-pressure cylinder extraction steam pipeline branch 243, an intermediate-pressure cylinder extraction steam pipeline branch isolation valve 231 is provided on the intermediate-pressure cylinder extraction steam pipeline branch 232, a high-pressure cylinder extraction steam pipeline branch isolation valve 222 is provided on the high-pressure cylinder extraction steam pipeline branch 223, a critical cylinder extraction steam pipeline branch isolation valve 211 is provided on the critical cylinder extraction steam pipeline branch 212, and a third pipeline isolation valve 131 is provided on the third pipeline 130.

[0148] The water vapor output end of the eighth high-pressure heater 88 is connected with the water vapor input end of the seventh high-pressure heater 87 through the fifth water vapor pipeline 881, the water vapor output end of the seventh high-pressure heater 87 is connected with the water vapor input end of the sixth high-pressure heater 86 through the fourth water vapor pipeline 871, the water vapor output end of the sixth high-pressure heater 86 is connected with the water vapor input end of the fifth high-pressure heater 85 through the third water vapor pipeline 861, the water vapor output end of the fifth high-pressure heater 85 is connected with the water vapor input end of the fourth high-pressure heater 84 through the second water vapor pipeline 851, and the water vapor output end of the fourth high-pressure heater 84 is connected with the water vapor input end of the second deaerator through the first water vapor pipeline 841; wherein the fifth water vapor pipeline 881 is provided with a fifth water vapor pipeline isolation valve, the fourth water vapor pipeline 871 is provided with a fourth water vapor pipeline isolation valve, the third water vapor pipeline 861 is provided with a third water vapor pipeline isolation valve, the second water vapor pipeline 851 is provided with a second water vapor pipeline isolation valve, and the first water vapor pipeline 841 is provided with a first water vapor pipeline isolation valve 842.

[0149] The first feedwater system comprises the condensate pump 40, the first low-pressure heater 51, the second low-pressure heater 52, the third low-pressure heater 53, the deaerator 60, the first deaerated water delivery pump 71, the first high-pressure heater 81, the second high-pressure heater 82 and the third high-pressure heater 83; the water working medium output end of the third high-pressure heater 83 is connected with the water working medium input end of the coal-fired boiler 90 through the first feedwater pipeline 830;

[0150] The second feedwater system comprises the condensate pump 40, the first low-pressure heater 51, the second low-pressure heater 52, the third low-pressure heater 53, the deaerator 60, the second deaerated water delivery pump 72, the fourth high-pressure heater 84, the fifth high-pressure heater 85, the sixth high-pressure heater 86, the seventh high-pressure heater 87 and the eighth high-pressure heater 88; the water working medium input end of the second deaerated water delivery pump 72 is connected with the water working medium output end of the deaerator 60 through the fourth pipeline 612, and the fourth pipeline 612 is provided with a fourth pipeline isolation valve 611; the output end of the eighth high-pressure heater 88 is connected with the water working medium input end of the preheater 11 through the second feedwater pipeline 880;

[0151] The steam extraction input end of the deaerator 60 is connected with the second steam extraction output end of the intermediate-pressure cylinder 23 through the second intermediate-pressure cylinder steam extraction pipeline 235, and the second intermediate-pressure cylinder steam extraction pipeline 235 is provided with a second intermediate-pressure cylinder steam extraction pipeline isolation valve.

[0152] In a specific scenario, when the power grid requires to reduce the power generation load, since the coal-fired boiler cannot quickly adjust the load, it is necessary to keep the coal-fired boiler running and the molten salt steam generation system shut down and isolate. The isolation measures are as follows: close the first pipeline isolation valve 111, the second pipeline isolation valve 121, the critical cylinder extraction pipeline branch isolation valve 211, the high-pressure cylinder extraction pipeline branch isolation valve 222, the second high-pressure cylinder exhaust pipeline branch isolation valve 227, the medium-pressure cylinder extraction pipeline branch isolation valve 231, the first low-pressure cylinder extraction pipeline isolation valve 242, the fourth pipeline isolation valve 611 and the first drain pipeline isolation valve 842. At this time, only the power generation system of the coal-fired boiler is shut down. The operation process is as follows: the main steam is generated by the coal-fired boiler, enters the critical cylinder 21 through the fifth pipeline 910 to perform work, and then enters the high-pressure cylinder 22 through the critical cylinder exhaust pipeline 218. After performing work in the high-pressure cylinder 22, it enters the coal-fired boiler through the high-pressure cylinder exhaust pipeline 225 and the first high-pressure cylinder exhaust pipeline branch 226 to be reheated, and then enters the intermediate-pressure cylinder 23 through the sixth pipeline 920 to perform work. The steam after performing work enters the low-pressure cylinder 24 through the intermediate-pressure cylinder exhaust pipeline 238 to perform work. The steam after performing work enters the exhaust condensing device 26 through the low-pressure cylinder exhaust pipeline 240 to condense into condensate, and then enters the condensate tank 30, thus completing the steam performing work and cooling process in the turbine. Condensate is sequentially pumped by the condensate pump 40 into the first, second, and third low-pressure heaters 51, 52, and 53 for heating. In this embodiment, the heat sources for the first, second, and third low-pressure heaters 51, 52, and 53 all come from the low-pressure cylinder 24. Condensate from the third low-pressure heater 53 enters the deaerator 60 for thermal deoxygenation, with its heat source coming from the second intermediate-pressure cylinder extraction steam pipeline 235. The deoxygenated water working medium is pressurized by the first deoxygenated water delivery pump 71 and sequentially pumped into the first, second, and third high-pressure heaters 81, 82, and 83 for heating. Finally, it enters the coal-fired boiler 90 through the first water supply pipeline 830. The first high-pressure heater 81 is heated by the high-pressure cylinder extraction steam pipeline 221, while the third high-pressure heater 83 is heated by the critical cylinder extraction steam pipeline 210.

[0153] When in the morning and evening peak or power grid requires maximum load output, the molten salt steam generation system is combined with the coal-fired boiler 90 to operate. At this time, the system of the coal-fired boiler 90 keeps the above-mentioned operation process, and the feedwater process of the molten salt steam generation system is that the fourth pipeline isolation valve 611 is opened, and after the second deaerated water delivery pump 72 is opened, the feedwater flows through the fourth high-pressure heater 84, the fifth high-pressure heater 85, the sixth high-pressure heater 86, the seventh high-pressure heater 87 and the eighth high-pressure heater 88 in sequence. The feedwater heating process of the molten salt steam generation system is that the critical cylinder extraction pipeline branch isolation valve 211, the high-pressure cylinder extraction pipeline branch isolation valve 222, the medium-pressure cylinder extraction pipeline branch isolation valve 231 and the first low-pressure cylinder extraction pipeline isolation valve 242 are opened. The third pipeline isolation valve 131 is opened, and the saturated steam generated in the evaporator 12 enters the eighth high-pressure heater 88 through the third pipeline 130 to heat the finally heated feedwater to a temperature close to the solidification point of the molten salt, and then the feedwater is sent to the preheater 11. The feedwater in the second feedwater pipeline 880 is heated to a saturated temperature after heat exchange with the molten salt in the preheater 11, and then the feedwater is further heat-exchanged with the molten salt in the evaporator 12 to complete the evaporation process, and finally the feedwater is further heat-exchanged with the molten salt in the superheater 13 to generate superheated steam. The superheated steam generated by the superheater 13 is mixed with the high-temperature steam in the critical cylinder exhaust pipeline 218 and then enters the high-pressure cylinder 22 to work after the first pipeline isolation valve 111 is opened. In particular, before the first pipeline isolation valve 111 is opened, it is necessary to ensure that the pressure of the high-temperature steam in the superheater 13 is slightly greater than or equal to the pressure of the steam in the critical cylinder exhaust pipeline 218. The operation process of the second reheater is that the second high-pressure cylinder exhaust pipeline branch isolation valve 227 is opened, the high-temperature steam in the high-pressure cylinder exhaust pipeline 225 enters the second reheater 14 through the second high-pressure cylinder exhaust pipeline branch 228 to be further heated after heat exchange with the molten salt, and the second pipeline isolation valve 121 is opened, and the reheated high-temperature steam enters the medium-pressure cylinder 23 through the second pipeline 120 to work. Thus, the molten salt steam generation system and the coal-fired boiler 90 complete the combined operation, and as the load of the molten salt steam generation system continuously increases, the power generation capacity of the entire power generation system also increases.

[0154] The specific embodiments of the utility model are described above. It should be understood that the utility model is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of claims, which does not affect the essential content of the utility model. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A power generation system, characterized in that: Including steam generation system and thermal power generation system; The thermal power generation system includes a coal-fired boiler (90), a first water supply system, a steam turbine and a generator (25); The output end of the first water supply system is connected to the water working medium input end of the coal-fired boiler (90); The steam turbine is connected to the generator (25); The steam turbine includes a critical cylinder (21), a high-pressure cylinder (22) and an intermediate-pressure cylinder (23); the main steam output end of the coal-fired boiler (90) is connected to the steam input end of the critical cylinder (21), the steam discharge end of the critical cylinder (21) is connected to the steam input end of the high-pressure cylinder (22), the steam discharge end of the high-pressure cylinder (22) is connected to the steam input end of the first reheater in the coal-fired boiler (90), and the steam output end of the first reheater is connected to the steam input end of the intermediate-pressure cylinder (23); The steam generation system includes a heat storage module, a steam generation module and a second water supply system; The steam generation module comprises a preheater (11), an evaporator (12), a superheater (13) and a second reheater (14); The output end of the second water supply system is connected to the water working medium input end of the preheater (11), the water working medium output end of the preheater (11) is connected to the water working medium input end of the evaporator (12), the water working medium output end of the evaporator (12) is connected to the water working medium input end of the superheater (13), and the superheated steam output end of the superheater (13) is connected to the steam input end of the high-pressure cylinder (22); the high-temperature heat storage medium output end of the heat storage module is connected to the heat storage medium input end of the superheater (13), the heat storage medium output end of the superheater (13) is connected to the heat storage medium input end of the evaporator (12), the heat storage medium output end of the evaporator (12) is connected to the heat storage medium input end of the preheater (11), and the heat storage medium output end of the preheater (11) is connected to the low-temperature heat storage medium input end of the heat storage module; The steam discharge end of the high-pressure cylinder (22) is also connected to the steam input end of the second reheater (14), and the steam output end of the second reheater (14) is connected to the steam input end of the intermediate-pressure cylinder (23); the high-temperature heat storage medium output end of the heat storage module is connected to the heat storage medium input end of the second reheater (14), and the heat storage medium output end of the second reheater (14) is connected to the low-temperature heat storage medium input end of the heat storage module.

2. A power generation system according to claim 1, characterized in that: The first water supply system comprises: a first water supply pump, a first low-pressure heating system, a first deaerator, a first deoxygenated water delivery pump (71) and a first high-pressure heating system; The output end of the first feedwater pump is connected to the water working medium input end of the first low-pressure heating system, the water working medium output end of the first low-pressure heating system is connected to the water working medium input end of the first deaerator, the water working medium output end of the first deaerator is connected to the water working medium input end of the first deoxygenated water delivery pump (71), the water working medium output end of the first deoxygenated water delivery pump (71) is connected to the water working medium input end of the first high-pressure heating system, and the water working medium output end of the first high-pressure heating system is connected to the water working medium input end of the coal-fired boiler (90); The second water supply system comprises: a second water supply pump, a second low-pressure heating system, a second deaerator, a second deoxygenated water delivery pump (72) and a second high-pressure heating system; The output end of the second water supply pump is connected to the water working medium input end of the second low-pressure heating system, the water working medium output end of the second low-pressure heating system is connected to the water working medium input end of the second deaerator, the water working medium output end of the second deaerator is connected to the water working medium input end of the second deoxygenated water delivery pump (72), the water working medium output end of the second deoxygenated water delivery pump (72) is connected to the water working medium input end of the second high-pressure heating system, and the water working medium output end of the second high-pressure heating system is connected to the water working medium input end of the preheater (11); The first water supply pump and the second water supply pump are the same water supply pump, or the first water supply pump and the second water supply pump are two independent water supply pumps; The first low-pressure heating system and the second low-pressure heating system are the same low-pressure heating system, or the first low-pressure heating system and the second low-pressure heating system are two independent low-pressure heating systems; The first deaerator and the second deaerator are the same deaerator, or the first deaerator and the second deaerator are two independent deaerators.

3. A power generation system according to claim 2, characterized in that: The extraction steam input end of the first high-pressure heating system is connected to the extraction steam output end of the steam turbine, and the first high-pressure heating system is used to heat the water working medium using the extraction steam of the steam turbine; The second high-pressure heating system comprises a first high-pressure heating module and a second high-pressure heating module, the water working medium input end of the first high-pressure heating module is connected to the water working medium output end of the second deoxygenated water delivery pump (72), the water working medium output end of the first high-pressure heating module is connected to the water working medium input end of the second high-pressure heating module, and the water working medium output end of the second high-pressure heating module is connected to the water working medium input end of the preheater (11); The extraction steam input end of the first high-pressure heating module is connected to the extraction steam output end of the steam turbine, and the first high-pressure heating module is used to heat the water working medium using the extraction steam of the steam turbine; the extraction steam input end of the second high-pressure heating module is connected to the extraction steam output end of the evaporator (12), and the second high-pressure heating module is used to heat the water working medium using the extraction steam of the evaporator (12).

4. A power generation system according to claim 3, characterized in that: The steam turbine further comprises a low-pressure cylinder (24), and the steam discharge end of the intermediate-pressure cylinder (23) is connected to the steam input end of the low-pressure cylinder (24).

5. A power generation system according to claim 4, characterized in that: The first high-pressure heating system includes a first high-pressure heater (81), a second high-pressure heater (82) and a third high-pressure heater (83); The water working medium input end of the first high-pressure heater (81) is connected to the water working medium output end of the first deoxygenated water delivery pump (71), the water working medium output end of the first high-pressure heater (81) is connected to the water working medium input end of the second high-pressure heater (82), the water working medium output end of the second high-pressure heater (82) is connected to the water working medium input end of the third high-pressure heater (83), and the water working medium output end of the third high-pressure heater (83) is connected to the water working medium input end of the coal-fired boiler (90); The extraction steam input end of the first high-pressure heater (81) is connected to the first extraction steam output end of the intermediate-pressure cylinder (23), the extraction steam input end of the second high-pressure heater (82) is connected to the extraction steam output end of the high-pressure cylinder (22), and the extraction steam input end of the third high-pressure heater (83) is connected to the extraction steam output end of the critical cylinder (21); The first high-pressure heating module includes a fourth high-pressure heater (84), a fifth high-pressure heater (85), a sixth high-pressure heater (86), and a seventh high-pressure heater (87); the second high-pressure heating module includes an eighth high-pressure heater (88); The water working medium input end of the fourth high-pressure heater (84) is connected to the water working medium output end of the second deoxygenated water delivery pump (72), the water working medium output end of the fourth high-pressure heater (84) is connected to the water working medium input end of the fifth high-pressure heater (85), the water working medium output end of the fifth high-pressure heater (85) is connected to the water working medium input end of the sixth high-pressure heater (86), the water working medium output end of the sixth high-pressure heater (86) is connected to the water working medium input end of the seventh high-pressure heater (87), the water working medium output end of the seventh high-pressure heater (87) is connected to the water working medium input end of the eighth high-pressure heater (88), and the water working medium output end of the eighth high-pressure heater (88) is connected to the water working medium input end of the preheater (11); The extraction steam input end of the fourth high-pressure heater (84) is connected to the fourth extraction steam output end of the low-pressure cylinder (24), the extraction steam input end of the fifth high-pressure heater (85) is connected to the first extraction steam output end of the medium-pressure cylinder (23), the extraction steam input end of the sixth high-pressure heater (86) is connected to the extraction steam output end of the high-pressure cylinder (22), the extraction steam input end of the seventh high-pressure heater (87) is connected to the extraction steam output end of the critical cylinder (21), and the extraction steam input end of the eighth high-pressure heater (88) is connected to the extraction steam output end of the evaporator (12).

6. A power generation system according to claim 4, characterized in that: It also includes an exhaust steam condensing device (26) and a condensate tank (30), wherein the exhaust steam output end of the low-pressure cylinder (24) is connected to the input end of the exhaust steam condensing device (26), the water working medium output end of the exhaust steam condensing device (26) is connected to the water working medium input end of the condensate tank (30), and the water working medium output end of the condensate tank (30) is connected to the water working medium input end of the first water supply pump and the water working medium input end of the second water supply pump.

7. A power generation system according to claim 4, characterized in that: The first low-pressure heating system comprises a first low-pressure heater (51), a second low-pressure heater (52) and a third low-pressure heater (53); The water working medium input end of the first low-pressure heater (51) is connected to the output end of the first water feed pump, the water working medium output end of the first low-pressure heater (51) is connected to the water working medium input end of the second low-pressure heater (52), the water working medium output end of the second low-pressure heater (52) is connected to the water working medium input end of the third low-pressure heater (53), and the water working medium output end of the third low-pressure heater (53) is connected to the water working medium input end of the first deaerator; The extraction steam input end of the first low-pressure heater (51) is connected to the first extraction steam output end of the low-pressure cylinder (24), the extraction steam input end of the second low-pressure heater (52) is connected to the second extraction steam output end of the low-pressure cylinder (24), and the extraction steam input end of the third low-pressure heater (53) is connected to the third extraction steam output end of the low-pressure cylinder (24); The second low-pressure heating system includes a fourth low-pressure heater, a fifth low-pressure heater, and a sixth low-pressure heater; The water working medium input end of the fourth low-pressure heater is connected to the water working medium output end of the second feed water pump, the water working medium output end of the fourth low-pressure heater is connected to the water working medium input end of the fifth low-pressure heater, the water working medium output end of the fifth low-pressure heater is connected to the water working medium input end of the sixth low-pressure heater, and the water working medium output end of the sixth low-pressure heater is connected to the water working medium input end of the second deaerator; The steam extraction input end of the fourth low-pressure heater is connected to the first steam extraction output end of the low-pressure cylinder (24), the steam extraction input end of the fifth low-pressure heater is connected to the second steam extraction output end of the low-pressure cylinder (24), and the steam extraction input end of the sixth low-pressure heater is connected to the third steam extraction output end of the low-pressure cylinder (24).

8. A power generation system according to claim 2, characterized in that: The steam extraction input end of the first deaerator is connected to the second steam extraction output end of the intermediate pressure cylinder (23), and the steam extraction input end of the second deaerator is connected to the second steam extraction output end of the intermediate pressure cylinder (23).

9. A power generation system according to claim 5, characterized in that: The hydrophobic output end of the eighth high-pressure heater (88) is connected to the hydrophobic input end of the seventh high-pressure heater (87), the hydrophobic output end of the seventh high-pressure heater (87) is connected to the hydrophobic input end of the sixth high-pressure heater (86), the hydrophobic output end of the sixth high-pressure heater (86) is connected to the hydrophobic input end of the fifth high-pressure heater (85), the hydrophobic output end of the fifth high-pressure heater (85) is connected to the hydrophobic input end of the fourth high-pressure heater (84), and the hydrophobic output end of the fourth high-pressure heater (84) is connected to the hydrophobic input end of the second deaerator.

10. A power generation system according to claim 1, characterized in that: The main steam output end of the coal-fired boiler (90) is connected to the steam input end of the critical cylinder (21) via a fifth pipeline (910), and a fifth pipeline isolation valve is provided on the fifth pipeline (910); The steam discharge end of the high-pressure cylinder (22) is connected to the steam input end of the first reheater in the coal-fired boiler (90) via a high-pressure cylinder exhaust pipe (225) and a first high-pressure cylinder exhaust pipe branch (226) in sequence, and a first high-pressure cylinder exhaust pipe branch isolation valve is provided on the first high-pressure cylinder exhaust pipe branch (226); The steam output end of the first reheater is connected to the steam input end of the intermediate pressure cylinder (23) via a sixth pipeline (920), and a sixth pipeline isolation valve is provided on the sixth pipeline (920); The superheated steam output end of the superheater (13) is connected to the steam input end of the high-pressure cylinder (22) via a first pipeline (110), and a first pipeline isolation valve (111) is provided on the first pipeline (110); The steam exhaust end of the high-pressure cylinder (22) is connected to the steam input end of the second reheater (14) via the high-pressure cylinder exhaust pipe (225) and the second high-pressure cylinder exhaust pipe branch (228) in sequence, and a second high-pressure cylinder exhaust pipe branch isolation valve (227) is provided on the second high-pressure cylinder exhaust pipe branch (228); The steam output end of the second reheater (14) is connected to the steam input end of the intermediate pressure cylinder (23) via a second pipeline (120), and a second pipeline isolation valve (121) is provided on the second pipeline (120).

11. A power generation system according to claim 9, characterized in that: The extraction steam input end of the first high-pressure heater (81) is connected to the first extraction steam output end of the intermediate-pressure cylinder (23) via the first intermediate-pressure cylinder extraction steam pipeline (230), the extraction steam input end of the second high-pressure heater (82) is connected to the extraction steam output end of the high-pressure cylinder (22) via the high-pressure cylinder extraction steam pipeline (221), and the extraction steam input end of the third high-pressure heater (83) is connected to the extraction steam output end of the critical cylinder (21) via the critical cylinder extraction steam pipeline (210); wherein a first intermediate-pressure cylinder extraction steam pipeline isolation valve is provided on the first intermediate-pressure cylinder extraction steam pipeline (230), a high-pressure cylinder extraction steam pipeline isolation valve is provided on the high-pressure cylinder extraction steam pipeline (221), and a critical cylinder extraction steam pipeline isolation valve is provided on the critical cylinder extraction steam pipeline (210); The extraction steam input end of the fourth high-pressure heater (84) is connected to the fourth extraction steam output end of the low-pressure cylinder (24) through the first low-pressure cylinder extraction steam pipeline (243), the extraction steam input end of the fifth high-pressure heater (85) is connected to the first extraction steam output end of the intermediate-pressure cylinder (23) through the first intermediate-pressure cylinder extraction steam pipeline (230) and the intermediate-pressure cylinder extraction steam pipeline branch (232), the extraction steam input end of the sixth high-pressure heater (86) is connected to the extraction steam output end of the high-pressure cylinder (22) through the high-pressure cylinder extraction steam pipeline (221) and the high-pressure cylinder extraction steam pipeline branch (223), the extraction steam input end of the seventh high-pressure heater (87) is connected to the critical cylinder extraction steam pipeline (210) and the critical cylinder extraction steam pipeline branch (21 2) connected to the extraction steam output end of the critical cylinder (21), and the extraction steam input end of the eighth high-pressure heater (88) is connected to the extraction steam output end of the evaporator (12) through a third pipeline (130); wherein, a first low-pressure cylinder extraction steam pipeline isolation valve (242) is provided on the first low-pressure cylinder extraction steam pipeline (243), an intermediate-pressure cylinder extraction steam pipeline branch isolation valve (231) is provided on the intermediate-pressure cylinder extraction steam pipeline branch (232), a high-pressure cylinder extraction steam pipeline branch isolation valve (222) is provided on the high-pressure cylinder extraction steam pipeline branch (223), a critical cylinder extraction steam pipeline branch isolation valve (211) is provided on the critical cylinder extraction steam pipeline branch (212), and a third pipeline isolation valve (131) is provided on the third pipeline (130); The drain output end of the fourth high-pressure heater (84) is connected to the drain input end of the second deaerator via a first drain pipeline (841), and a first drain pipeline isolation valve (842) is provided on the first drain pipeline (841).

12. A power generation system according to any one of claims 1 to 11, characterized in that: The heat storage medium in the heat storage module is heated by a tower solar thermal collection system; or, The heat storage medium in the heat storage module is heated by an electric heater, and the electric energy required by the electric heater comes from a photovoltaic power generation system or a wind power generation system.

13. A power generation system according to any one of claims 1 to 11, characterized in that: The heat storage medium in the heat storage module is molten salt.

Images