Fused salt heat supply system of thermal power generating unit

Abstract

The invention provides a thermal power generating unit fused salt heat supply system, and belongs to the technical field of thermal power generating unit heat supply. The fused salt heat supply system of the thermal power generating unit comprises a steam turbine unit and a fused salt assembly. According to the system, low-temperature fused salt is heated through steam extraction of an intermediate-pressure cylinder of a turboset, and fused salt and extracted steam at different temperatures are generated. And the fused salt assembly performs multi-stage heat exchange by using the fused salt and the extracted steam, so that the deoxygenated feed water is finally heated, and external heat supply steam with high and low parameters is generated. The system effectively completes heat storage and heat release of the fused salt, cyclic utilization of the fused salt is achieved, and the energy efficiency is improved. According to the invention, heat storage is carried out on the fused salt assembly through cascade extraction steam utilization of the turboset, the fused salt assembly raises the temperature of heat supply water with different parameters through heat release, and heat is supplied to the outside after the temperature required by a user is reached.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power unit heating, and in particular to a molten salt heating system for a thermal power unit. Background Art

[0002] Conventional thermal power units generally use a cascade extraction heating technology route for heating. The main extraction steam sources for heating include: main steam extraction, first extraction, reheat cold section extraction, reheat hot section extraction, medium-pressure cylinder exhaust extraction, etc. Due to the demand for carbon neutrality and carbon emission reduction, the steam source for heating in most industrial parks has been adjusted from self-contained power plants to large thermal power units, and the characteristics of their required steam sources are high parameters and large flow rates. In order to match the high-parameter heating requirements, the thermal power units select the extraction ports from the main steam, first extraction, reheat cold section, and reheat hot section. In order to ensure that the main and reheat steam burned by the boiler do not overheat, the extraction steam heating flow rates of the main steam, first extraction, and reheat cold section are all greatly restricted.

[0003] As the unit load decreases, the pressure in the cold and hot reheat sections will also decrease at the same time. Even if the Zhonglian gate-controlled heating method is used, the heating parameters will not be met in the low-load section. In order to meet the heating parameter requirements, the operating load range of the thermal power unit is limited, and the heating capacity of the unit is also greatly restricted. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a molten salt heating system for a thermal power unit to solve the above problems.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a molten salt heating system for a thermal power unit, comprising: a steam turbine unit and a molten salt component; a first steam inlet end of the molten salt component is connected to a first steam extraction end of the steam turbine unit, a second end of the molten salt component is connected to a second steam extraction end of the steam turbine unit, a water outlet end of the molten salt component is connected to a water inlet end of the steam turbine unit, and a water inlet end of the molten salt component is connected to a water outlet end of the steam turbine unit;

[0006] The steam turbine unit is used to discharge the extraction steam of the intermediate pressure cylinder 1 and the extraction steam of the intermediate pressure cylinder 2, and to generate exhaust steam return water of the low pressure cylinder;

[0007] The molten salt component is used to heat the pre-stored low-temperature molten salt by using the pre-cooled medium-pressure cylinder first extraction steam to obtain the second-stage cooled medium-pressure cylinder first extraction steam and the molten salt heated by the first extraction steam;

[0008] The molten salt assembly is also used to heat the pre-stored low-temperature molten salt using the secondary extraction steam of the medium-pressure cylinder to obtain the cooled secondary extraction steam of the medium-pressure cylinder and the molten salt heated by the secondary extraction steam;

[0009] The molten salt assembly is also used to heat the molten salt heated by the extraction steam using the extraction steam of the intermediate pressure cylinder, so as to obtain the pre-cooled extraction steam of the intermediate pressure cylinder and the high-temperature molten salt; wherein the molten salt heated by the extraction steam is obtained by mixing the molten salt heated by the first extraction steam and the molten salt heated by the second extraction steam;

[0010] The steam turbine unit is also used to mix the cooled secondary extraction steam from the intermediate pressure cylinder with the exhaust steam return water from the low pressure cylinder and then deoxygenate it to obtain deoxygenated feed water;

[0011] The molten salt component is also used to heat the pre-heated deoxygenated feed water with high-temperature molten salt to obtain cooled molten salt and high-parameter external heating steam;

[0012] The molten salt component is also used to heat the deoxygenated feed water with the cooled molten salt to obtain the molten salt after the deoxygenated feed water heat exchange and the pre-heated deoxygenated feed water;

[0013] The molten salt component is also used to heat the cooling water with the cooled molten salt, and obtain the molten salt after the cooling water heat exchange and the low-parameter external heating steam; wherein the cooling water is obtained by mixing the deoxygenated feed water and the first extraction steam of the intermediate pressure cylinder after the second stage cooling;

[0014] The molten salt component is also used to mix the molten salt obtained after heat exchange with the deoxygenated feed water and the molten salt obtained after heat exchange with the cooling water to obtain pre-stored low-temperature molten salt.

[0015] Optionally, the steam turbine unit includes: a boiler, an intermediate pressure cylinder, a low pressure cylinder, a low pressure heater, a deaerator, a feed water pump turbine and a feed water pump;

[0016] The hot resteam exhaust end of the boiler is connected to the first extraction end of the intermediate pressure cylinder, the third extraction end of the intermediate pressure cylinder is connected to the steam inlet end of the low pressure cylinder, the output end of the low pressure heater is connected to the water inlet end of the deaerator, the steam inlet end of the deaerator is connected to the exhaust end of the intermediate pressure cylinder, the water outlet end of the deaerator is connected to the input end of the feed water pump, and the input end of the feed water pump turbine is connected to the exhaust end of the intermediate pressure cylinder.

[0017] Optionally, the molten salt assembly includes: a low-temperature molten salt storage tank, a first molten salt heater, a second molten salt heater, a third molten salt heater, a high-temperature molten salt storage tank, a first molten salt radiator, a second molten salt radiator, a third molten salt radiator and a low-pressure heat supply and water mixing tank;

[0018] The output end of the deaerator is respectively connected to the first input end of the low-pressure heat supply and water supply mixing tank and the low-temperature medium input end of the second molten salt radiator, the low-temperature medium output end of the second molten salt radiator is connected to the low-temperature medium input end of the first molten salt radiator, the high-temperature medium input end of the second molten salt radiator is connected to the high-temperature medium output end of the first molten salt radiator, the high-temperature medium output end of the second molten salt radiator is connected to the input end of the low-temperature molten salt storage tank, the high-temperature medium output end of the first molten salt radiator is connected to the high-temperature medium input end of the third molten salt radiator, the high-temperature medium output end of the third molten salt radiator is connected to the input end of the low-temperature molten salt storage tank, the low-temperature medium input end of the third molten salt radiator is connected to the output end of the low-pressure heat supply and water supply mixing tank, the high-temperature medium input end of the first molten salt radiator is connected to the output end of the high-temperature molten salt storage tank, and the input end of the high-temperature molten salt storage tank is connected to the second molten salt heater. The low-temperature medium output end is connected, the low-temperature medium input end of the second molten salt heater is connected to the low-temperature medium output end of the first molten salt heater, the low-temperature medium input end of the first molten salt heater is connected to the output end of the low-temperature molten salt storage tank, the high-temperature medium input end of the first molten salt heater is connected to the second extraction steam end of the medium-pressure cylinder, the high-temperature medium output end of the first molten salt heater is connected to the input end of the deaerator, the high-temperature medium input end of the second molten salt heater is connected to the first extraction steam end of the medium-pressure cylinder, the high-temperature medium output end of the second molten salt heater is connected to the high-temperature medium input end of the third molten salt heater, the high-temperature medium output end of the third molten salt heater is connected to the second input end of the low-pressure heating and water supply mixing tank, the low-temperature medium input end of the third molten salt heater is connected to the output end of the low-temperature molten salt storage tank, and the low-temperature medium output end of the third molten salt heater is connected to the low-temperature medium input end of the second molten salt heater;

[0019] The third molten salt heater is used to heat the pre-stored low-temperature molten salt by using the pre-cooled medium-pressure cylinder first extraction steam to obtain the second-stage cooled medium-pressure cylinder first extraction steam and the molten salt heated by the first extraction steam;

[0020] The first molten salt heater is used to heat the pre-stored low-temperature molten salt by using the secondary extraction steam of the medium-pressure cylinder to obtain the molten salt heated by the secondary extraction steam of the medium-pressure cylinder after cooling;

[0021] The second molten salt heater is used to heat the molten salt heated by the extraction steam using the extraction steam of the intermediate pressure cylinder, so as to obtain the pre-cooled extraction steam of the intermediate pressure cylinder and the high-temperature molten salt; wherein the molten salt heated by the extraction steam is obtained by mixing the molten salt heated by the first extraction steam and the molten salt heated by the second extraction steam;

[0022] The first molten salt heat release device is used to heat the pre-heated deoxygenated feed water with high-temperature molten salt to obtain cooled molten salt and high-parameter external heating steam;

[0023] The second molten salt heat release device is used to heat the deoxygenated feed water with the cooled molten salt to obtain the molten salt after the deoxygenated feed water heat exchange and the pre-heated deoxygenated feed water;

[0024] The third molten salt heat releaser is used to heat the cooling water with the cooled molten salt, so as to obtain the molten salt after the cooling water heat exchange and the low-parameter external heating steam; wherein, the cooling water is obtained by mixing the deoxygenated feed water and the first extraction steam of the intermediate pressure cylinder after the second stage cooling.

[0025] Optionally, the molten salt assembly further comprises: a low-temperature molten salt pump and a high-temperature molten salt pump;

[0026] The input end of the low-temperature molten salt pump is connected to the output end of the low-temperature molten salt storage tank, the output end of the low-temperature molten salt pump is respectively connected to the low-temperature medium input end of the first molten salt heater and the low-temperature medium input end of the third molten salt heater, the input end of the high-temperature molten salt pump is connected to the output end of the high-temperature molten salt storage tank, and the output end of the high-temperature molten salt pump is connected to the high-temperature medium input end of the first molten salt radiator.

[0027] Optionally, the molten salt assembly further comprises: a heating feedwater pump and a heating feedwater pump steam turbine;

[0028] The input end of the heating water supply pump is connected to the output end of the deaerator, the heating water supply pump is connected to the heating water supply pump turbine through a bearing, the first output end of the heating water supply pump is connected to the low-temperature medium input end of the second molten salt heat release device, and the second output end of the heating water supply pump is connected to the first input end of the low-pressure heating water supply mixing tank.

[0029] Optionally, the molten salt assembly further comprises: a low-temperature molten salt flow control valve, a water supply flow control valve and a high-temperature molten salt flow control valve;

[0030] The low-temperature molten salt flow control valve is arranged between the output end of the low-temperature molten salt storage tank and the low-temperature medium input end of the third molten salt heater, the water supply flow control valve is arranged between the high-temperature medium output end of the third molten salt heater and the second input end of the low-pressure heating and water supply mixing tank, and the high-temperature molten salt flow control valve is arranged between the high-temperature medium output end of the first molten salt radiator and the high-temperature medium input end of the third molten salt radiator;

[0031] The low-temperature molten salt flow control valve is used to adjust the molten salt flow at the inlet of the third molten salt radiator inputted from the low-temperature molten salt storage tank to the third molten salt heater;

[0032] The feedwater flow control valve is used to adjust the flow of the extraction steam from the intermediate pressure cylinder of the low-pressure heating feedwater mixing tank input by the third molten salt heater;

[0033] The high-temperature molten salt flow control valve is used to adjust the molten salt flow at the inlet of the third molten salt heater input from the first molten salt radiator to the third molten salt radiator.

[0034] Optionally, the molten salt assembly further includes: a data monitoring device and a computing and analyzing device; the data monitoring device is communicatively connected with the computing and analyzing device;

[0035] The data monitoring device is used to monitor the molten salt flow rate at the inlet of the first molten salt heater, the molten salt flow rate at the inlet of the second molten salt radiator, the flow rate of the second extraction steam of the medium pressure cylinder, the inlet feed water flow rate of the third molten salt radiator, the inlet feed water flow rate of the first molten salt radiator, the first extraction steam temperature of the medium pressure cylinder, the second extraction steam temperature of the medium pressure cylinder, the molten salt temperature at the outlet of the low-temperature molten salt storage tank, the molten salt temperature at the outlet of the high-temperature molten salt storage tank, the molten salt temperature at the outlet of the first molten salt heater, the second extraction steam temperature of the medium pressure cylinder at the outlet of the first molten salt heater, the first extraction steam temperature of the medium pressure cylinder at the outlet of the second molten salt heater, the first extraction steam temperature of the medium pressure cylinder at the outlet of the third molten salt heater, and the The molten salt temperature at the outlet of the third molten salt heater, the molten salt temperature at the outlet of the first molten salt radiator, the feed water temperature at the inlet of the first molten salt radiator, the feed water temperature at the inlet of the third molten salt radiator, the low parameter heating steam temperature, the high parameter heating steam temperature, the extraction steam pressure of the intermediate pressure cylinder 1, the extraction steam pressure of the intermediate pressure cylinder 2, the extraction steam pressure of the intermediate pressure cylinder 2 at the outlet of the first molten salt heater, the feed water pressure at the inlet of the first molten salt radiator, the extraction steam pressure of the intermediate pressure cylinder 1 at the outlet of the second molten salt heater, the feed water pressure at the inlet of the third molten salt radiator, the extraction steam pressure of the intermediate pressure cylinder 1 at the outlet of the third molten salt heater, the low parameter heating steam pressure and the high parameter heating steam pressure;

[0036] The calculation and analysis device is used to respectively compare the extraction steam temperature and pressure of the intermediate pressure cylinder 1, the extraction steam temperature and pressure of the intermediate pressure cylinder 2, the extraction steam temperature and pressure of the intermediate pressure cylinder 2 at the outlet of the first molten salt heater, the extraction steam temperature and pressure of the intermediate pressure cylinder 1 at the outlet of the second molten salt heater, the extraction steam temperature and pressure of the intermediate pressure cylinder 1 at the outlet of the third molten salt heater, the feed water temperature and pressure of the first molten salt radiator inlet, the feed water temperature and pressure of the third molten salt radiator inlet, the low parameter heating steam temperature and pressure, and the high parameter heating steam temperature and pressure with the preset steam enthalpy value table Matching is performed to determine the enthalpy value of the steam extracted from the intermediate pressure cylinder 1, the enthalpy value of the steam extracted from the intermediate pressure cylinder 2, the enthalpy value of the steam extracted from the intermediate pressure cylinder 2 at the outlet of the first molten salt heater, the enthalpy value of the steam extracted from the intermediate pressure cylinder 1 at the outlet of the second molten salt heater, the enthalpy value of the steam extracted from the intermediate pressure cylinder 1 at the outlet of the third molten salt heater, the enthalpy value of the feed water at the inlet of the first molten salt radiator, the enthalpy value of the feed water at the inlet of the third molten salt radiator, the enthalpy value of the low-parameter heating steam, and the enthalpy value of the high-parameter heating steam; wherein the preset steam enthalpy value table is used to characterize the mapping relationship between the temperature and pressure of the steam and the enthalpy value;

[0037] The calculation and analysis device is also used to use the following formula to calculate the molten salt flow rate at the inlet of the first molten salt heater, the molten salt flow rate at the inlet of the second molten salt radiator, the flow rate of the second extraction steam of the medium-pressure cylinder, the inlet feed water flow rate of the third molten salt radiator, the inlet feed water flow rate of the first molten salt radiator, the molten salt temperature at the outlet of the high-temperature molten salt storage tank, the molten salt temperature at the outlet of the low-temperature molten salt storage tank, the molten salt temperature at the outlet of the first molten salt heater, the molten salt temperature at the outlet of the third molten salt heater, the molten salt temperature at the outlet of the first molten salt radiator, the enthalpy value of the low-parameter heating steam, The enthalpy of the feed water at the inlet of the third molten salt radiator, the enthalpy of the feed water at the inlet of the first molten salt radiator, the enthalpy of the high-parameter heating steam, the enthalpy of the second extraction steam of the intermediate pressure cylinder, the enthalpy of the second extraction steam of the intermediate pressure cylinder at the outlet of the first molten salt heater, the enthalpy of the first extraction steam of the intermediate pressure cylinder, the enthalpy of the first extraction steam of the intermediate pressure cylinder, the enthalpy of the first extraction steam of the intermediate pressure cylinder at the outlet of the second molten salt heater and the enthalpy of the first extraction steam of the intermediate pressure cylinder at the outlet of the third molten salt heater are calculated to obtain the molten salt flow rate at the inlet of the third molten salt radiator, the flow rate of the first extraction steam of the intermediate pressure cylinder and the molten salt flow rate at the inlet of the third molten salt heater;

[0038] Where, q1 represents the molten salt flow rate at the inlet of the third molten salt radiator, t x represents the molten salt temperature at the outlet of the first molten salt heat release device, t0 represents the molten salt temperature at the outlet of the low-temperature molten salt storage tank, u represents the specific heat capacity of the molten salt, k1 represents the heat release efficiency of the molten salt, q L represents the inlet water flow rate of the third molten salt radiator, H L Indicates the enthalpy value of low-parameter heating steam, H L0 represents the enthalpy of the feed water at the inlet of the third molten salt radiator, q2 represents the molten salt flow rate at the inlet of the second molten salt radiator, t T represents the molten salt temperature at the outlet of the high-temperature molten salt storage tank, q H represents the water flow rate at the inlet of the first molten salt radiator, H H Indicates the enthalpy value of high-parameter heating steam, H HL represents the enthalpy of the feed water at the inlet of the first molten salt radiator, q n It represents the flow rate of the steam extracted from the intermediate pressure cylinder, q m represents the flow rate of the second extraction steam of the medium pressure cylinder, q3 represents the flow rate of the molten salt at the inlet of the third molten salt heater, q4 represents the flow rate of the molten salt at the inlet of the first molten salt heater, t y represents the molten salt temperature at the outlet of the third molten salt heater, t z represents the molten salt temperature at the outlet of the first molten salt heater, k2 represents the molten salt heat storage efficiency, H1 represents the enthalpy value of the second extraction steam from the intermediate pressure cylinder, H2 represents the enthalpy value of the second extraction steam from the intermediate pressure cylinder at the outlet of the first molten salt heater, H3 represents the enthalpy value of the first extraction steam from the intermediate pressure cylinder, H4 represents the enthalpy value of the first extraction steam from the intermediate pressure cylinder at the outlet of the second molten salt heater, and H5 represents the enthalpy value of the first extraction steam from the intermediate pressure cylinder at the outlet of the third molten salt heater;

[0039] The calculation and analysis device is also used to generate a low-temperature molten salt flow control valve opening adjustment instruction, a feedwater flow control valve opening adjustment instruction and a high-temperature molten salt flow control valve opening adjustment instruction based on the molten salt flow at the inlet of the third molten salt radiator, the flow of the first extraction steam of the medium-pressure cylinder and the molten salt flow at the inlet of the third molten salt heater;

[0040] The low-temperature molten salt flow control valve is used to control the opening of the low-temperature molten salt flow control valve when receiving the low-temperature molten salt flow control valve opening adjustment instruction, so as to adjust the molten salt flow at the inlet of the third molten salt radiator inputted into the third molten salt heater by the low-temperature molten salt storage tank;

[0041] The feedwater flow control valve is used to control the opening of the feedwater flow control valve when receiving a feedwater flow control valve opening adjustment instruction, so as to adjust the flow rate of the medium-pressure cylinder first extraction steam inputted into the low-pressure heating feedwater mixing tank by the third molten salt heater;

[0042] The high-temperature molten salt flow control valve is used to control the opening of the high-temperature molten salt flow control valve when receiving a high-temperature molten salt flow control valve opening adjustment instruction to adjust the molten salt flow at the inlet of the third molten salt heater input from the first molten salt radiator to the third molten salt radiator.

[0043] Optionally, the data monitoring device includes: a first flow measurement component, a second flow measurement component, a third flow measurement component, a fourth flow measurement component and a fifth flow measurement component;

[0044] The first flow measurement component is arranged between the output end of the low-temperature molten salt storage tank and the low-temperature medium input end of the first molten salt heater, and the second flow measurement component is arranged between the high-temperature medium output end of the first molten salt radiator and the high-temperature medium input end of the third molten salt radiator;

[0045] The third flow measurement assembly is arranged between the second extraction steam end of the medium pressure cylinder and the high temperature medium input end of the first molten salt heater, the fourth flow measurement assembly is arranged between the output end of the low pressure heating and water supply mixing tank and the low temperature medium input end of the third molten salt radiator, and the fifth flow measurement assembly is arranged between the output end of the deaerator and the low temperature medium input end of the first molten salt radiator;

[0046] The first flow measurement component is used to monitor the molten salt flow at the inlet of the first molten salt heater;

[0047] The second flow measurement component is used to monitor the inlet molten salt flow of the second molten salt radiator;

[0048] The third flow measurement component is used to monitor the flow rate of the secondary extraction steam of the intermediate pressure cylinder;

[0049] The fourth flow measurement component is used to monitor the inlet feed water flow of the third molten salt radiator;

[0050] The fifth flow measurement component is used to monitor the water feed flow at the inlet of the first molten salt radiator.

[0051] Optionally, the data monitoring device further includes: a first temperature measurement component, a second temperature measurement component, a third temperature measurement component, a fourth temperature measurement component, a fifth temperature measurement component, a sixth temperature measurement component, a seventh temperature measurement component, an eighth temperature measurement component, a ninth temperature measurement component, a tenth temperature measurement component, an eleventh temperature measurement component, a twelfth temperature measurement component, a thirteenth temperature measurement component and a fourteenth temperature measurement component;

[0052] The first temperature measuring component is arranged between the first extraction steam end of the medium pressure cylinder and the high temperature medium input end of the second molten salt heater, the second temperature measuring component is arranged between the second extraction steam end of the medium pressure cylinder and the high temperature medium input end of the first molten salt heater, the third temperature measuring component is arranged between the output end of the low temperature molten salt storage tank and the low temperature medium input end of the first molten salt heater, the fourth temperature measuring component is arranged between the output end of the high temperature molten salt storage tank and the high temperature medium input end of the first molten salt radiator, the fifth temperature measuring component is arranged between the low temperature medium output end of the first molten salt heater and the low temperature medium input end of the second molten salt heater, the sixth temperature measuring component is arranged between the high temperature medium output end of the first molten salt heater and the input end of the deaerator, and the seventh temperature measuring component is arranged between the high temperature medium output end of the second molten salt heater. The medium output end and the high-temperature medium input end of the third molten salt heater, the eighth temperature measuring component is arranged between the high-temperature medium output end of the third molten salt heater and the second input end of the low-pressure heating and water supply mixing tank, the ninth temperature measuring component is arranged between the low-temperature medium output end of the third molten salt heater and the low-temperature medium input end of the second molten salt heater, the tenth temperature measuring component is arranged between the high-temperature medium output end of the first molten salt radiator and the high-temperature medium input end of the second molten salt radiator, the eleventh temperature measuring component and the fourteenth temperature measuring component are both arranged at the low-temperature medium output end of the second molten salt radiator, the twelfth temperature measuring component is arranged between the low-temperature medium input end of the first molten salt radiator and the output end of the deaerator, and the thirteenth temperature measuring component is arranged at the low-temperature medium output end of the third molten salt radiator;

[0053] The first temperature measuring assembly is used to monitor the extraction steam temperature of the intermediate pressure cylinder;

[0054] The second temperature measurement component is used to monitor the secondary extraction steam temperature of the intermediate pressure cylinder;

[0055] The third temperature measurement component is used to monitor the molten salt temperature at the outlet of the low-temperature molten salt storage tank;

[0056] The fourth temperature measurement component is used to monitor the molten salt temperature at the outlet of the high-temperature molten salt storage tank;

[0057] The fifth temperature measuring component is used to monitor the molten salt temperature at the outlet of the first molten salt heater;

[0058] The sixth temperature measurement component is used to monitor the temperature of the second extraction steam of the intermediate pressure cylinder at the outlet of the first molten salt heater;

[0059] The seventh temperature measurement component is used to monitor the extraction steam temperature of the intermediate pressure cylinder at the outlet of the second molten salt heater;

[0060] The eighth temperature measurement component is used to monitor the extraction steam temperature of the intermediate pressure cylinder at the outlet of the third molten salt heater;

[0061] The ninth temperature measurement component is used to monitor the molten salt temperature at the outlet of the third molten salt heater;

[0062] The tenth temperature measuring component is used to monitor the molten salt temperature at the outlet of the first molten salt radiator;

[0063] The eleventh temperature measurement component is used to monitor the inlet feed water temperature of the first molten salt radiator;

[0064] The twelfth temperature measuring component is used to monitor the inlet feed water temperature of the third molten salt radiator;

[0065] The thirteenth temperature measurement component is used to monitor the low parameter heating steam temperature;

[0066] The fourteenth temperature measurement component is used to monitor the high parameter heating steam temperature.

[0067] Optionally, the data monitoring device further includes: a first pressure measurement component, a second pressure measurement component, a third pressure measurement component, a fourth pressure measurement component, a fifth pressure measurement component, a sixth pressure measurement component, a seventh pressure measurement component, an eighth pressure measurement component and a ninth pressure measurement component;

[0068] The first pressure measuring assembly is arranged between the first extraction steam end of the medium pressure cylinder and the high temperature medium input end of the second molten salt heater, the second pressure measuring assembly is arranged between the second extraction steam end of the medium pressure cylinder and the high temperature medium input end of the first molten salt heater, the third pressure measuring assembly is arranged between the high temperature medium output end of the first molten salt heater and the input end of the deaerator, the fourth pressure measuring assembly is arranged between the low temperature medium output end of the second molten salt radiator and the low temperature medium input end of the first molten salt radiator, the fifth pressure measuring assembly is arranged between the high temperature medium output end of the second molten salt heater and the high temperature medium input end of the third molten salt heater, the sixth pressure measuring assembly is arranged between the output end of the low pressure heating and water supply mixing tank and the low temperature medium input end of the third molten salt radiator, the seventh pressure measuring assembly is arranged between the high temperature medium output end of the third molten salt heater and the second input end of the low pressure heating and water supply mixing tank, the eighth pressure measuring assembly is arranged at the low temperature medium output end of the third molten salt radiator, and the ninth pressure measuring assembly is arranged at the low temperature medium output end of the second molten salt radiator;

[0069] The first pressure measuring assembly is used to monitor the extraction steam pressure of the intermediate pressure cylinder;

[0070] The second pressure measuring assembly is used to monitor the secondary extraction steam pressure of the intermediate pressure cylinder;

[0071] The third pressure measurement assembly is used to monitor the second extraction steam pressure of the intermediate pressure cylinder at the outlet of the first molten salt heater;

[0072] The fourth pressure measuring assembly is used to monitor the water supply pressure at the inlet of the first molten salt radiator;

[0073] The fifth pressure measuring assembly is used to monitor the extraction steam pressure of the intermediate pressure cylinder at the outlet of the second molten salt heater;

[0074] The sixth pressure measuring assembly is used to monitor the water supply pressure at the inlet of the third molten salt radiator;

[0075] The seventh pressure measurement assembly is used to monitor the first extraction steam pressure of the intermediate pressure cylinder at the outlet of the third molten salt heater;

[0076] The eighth pressure measurement assembly is used to monitor the low parameter heating steam pressure;

[0077] The ninth pressure measurement assembly is used to monitor the high parameter heating steam pressure.

[0078] Beneficial effects of the present invention:

[0079] In the embodiment of the present invention, a molten salt heating system is added to the thermal power unit for the large-flow, multi-parameter external heating operation mode, so that the unit can achieve thermal and electrical decoupling, which significantly improves the flexibility of the unit, meets the user's needs for heating with different parameters, ensures the heating capacity of the unit under different loads, and improves the economy of the unit.

[0080] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0082] Figure 1 It is a structural schematic diagram of a molten salt heating system for a thermal power unit provided in an embodiment of the present invention.

[0083] Description of Reference Numerals

[0084] 1- boiler; 2- high pressure cylinder; 3- medium pressure cylinder; 4- low pressure cylinder; 5- condenser;

[0085] 6- condensate pump; 7- low pressure heater; 8- deaerator;

[0086] 9-feedwater pump turbine; 10-feedwater pump; 11-high pressure heater;

[0087] 12-heating feed water pump; 13-heating feed water pump turbine; 14-low-pressure heating feed water mixing tank;

[0088] 15- low temperature molten salt storage tank; 16- low temperature molten salt pump; 17- low temperature molten salt flow control valve;

[0089] 18-third molten salt heater; 19-first molten salt heater; 20-second molten salt heater;

[0090] 21-water flow control valve; 22-high temperature molten salt storage tank; 23-high temperature molten salt pump;

[0091] 24-first molten salt radiator; 25-high temperature molten salt flow control valve; 26-third molten salt radiator;

[0092] 27-second molten salt radiator; R1-first flow measurement assembly;

[0093] R2-second flow measurement component; R3-third flow measurement component; R4-fourth flow measurement component;

[0094] R5-fifth flow measurement component; T1-first temperature measurement component; T2-second temperature measurement component;

[0095] T3-third temperature measurement component; T4-fourth temperature measurement component; T5-fifth temperature measurement component;

[0096] T6-sixth temperature measurement component; T7-seventh temperature measurement component; T8-eighth temperature measurement component;

[0097] T9-ninth temperature measurement component; T10-tenth temperature measurement component;

[0098] T11-eleventh temperature measurement component; T12-twelfth temperature measurement component;

[0099] T13-thirteenth temperature measurement component; T14-fourteenth temperature measurement component;

[0100] P1-first pressure measurement component; P2-second pressure measurement component; P3-third pressure measurement component;

[0101] P4-fourth pressure measurement component; P5-fifth pressure measurement component; P6-sixth pressure measurement component;

[0102] P7-the seventh pressure measurement component; P8-the eighth pressure measurement component; P9-the ninth pressure measurement component. DETAILED DESCRIPTION

[0103] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0104] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0105] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0106] Embodiment 1

[0107] Please refer to Figure 1 , Figure 1The invention is a schematic diagram of the structure of the molten salt heating system for a thermal power unit provided by an embodiment of the present invention, the system comprising: a steam turbine unit and a molten salt component; a first steam inlet end of the molten salt component is connected to a first extraction steam end of the steam turbine unit, a second end of the molten salt component is connected to a second extraction steam end of the steam turbine unit, a water outlet end of the molten salt component is connected to a water inlet end of the steam turbine unit, and a water inlet end of the molten salt component is connected to a water outlet end of the steam turbine unit; a steam turbine unit is used to discharge the first extraction steam of the intermediate pressure cylinder and the second extraction steam of the intermediate pressure cylinder, and generate a low pressure cylinder Exhaust steam return water; molten salt component, used to use the pre-cooled medium-pressure cylinder first extraction steam to heat the pre-stored low-temperature molten salt, to obtain the medium-pressure cylinder first extraction steam after secondary cooling and the molten salt heated by the first extraction steam; the molten salt component is also used to use the medium-pressure cylinder second extraction steam to heat the pre-stored low-temperature molten salt, to obtain the cooled medium-pressure cylinder second extraction steam and the molten salt heated by the second extraction steam; the molten salt component is also used to use the medium-pressure cylinder first extraction steam to heat the molten salt heated by the extraction steam, to obtain the pre-cooled The steam turbine unit is also used to mix the cooled intermediate pressure cylinder second extraction steam with the low pressure cylinder exhaust steam return water and then perform deoxygenation treatment to obtain deoxygenated feed water; the molten salt component is also used to use the high temperature molten salt to heat the pre-heated deoxygenated feed water to obtain cooled molten salt and high parameter external heating steam; the molten salt component is also used to use the cooled The molten salt heats the deoxygenated feed water to obtain molten salt after heat exchange with the deoxygenated feed water and pre-heated deoxygenated feed water; the molten salt component is also used to heat the cooling water with the cooled molten salt to obtain molten salt after heat exchange with the cooling water and low-parameter external heating steam; wherein the cooling water is obtained by mixing the deoxygenated feed water and the first extraction steam of the medium-pressure cylinder after secondary cooling; the molten salt component is also used to mix the molten salt after heat exchange with the deoxygenated feed water and the molten salt after heat exchange with the cooling water to obtain pre-stored low-temperature molten salt.

[0108] In one embodiment, the steam turbine unit includes: a boiler 1, a high-pressure cylinder 2, an intermediate-pressure cylinder 3, a low-pressure cylinder 4, a condenser 5, a condensate pump 6, a low-pressure heater 7, a deaerator 8, a feedwater pump 10, a feedwater pump turbine 9 and a high-pressure heater 11; the main steam exhaust end of the boiler 1 is connected to the air inlet end of the high-pressure cylinder 2, the exhaust end of the high-pressure cylinder 2 is connected to the air inlet end of the boiler 1, the hot re-steam exhaust end of the boiler 1 is connected to the first extraction end of the intermediate-pressure cylinder 3, the third extraction end of the intermediate-pressure cylinder 3 is connected to the steam inlet end of the low-pressure cylinder 4, the exhaust end of the low-pressure cylinder 4 is connected to the input end of the condenser 5, and the exhaust end of the condenser 5 is connected to the steam inlet end of the low-pressure cylinder 4. The output end is connected to the input end of the condensate pump 6, the output end of the condensate pump 6 is connected to the input end of the low-pressure heater 7, the output end of the low-pressure heater 7 is connected to the water inlet end of the deaerator 8, the steam inlet end of the deaerator 8 is connected to the exhaust end of the medium-pressure cylinder 3, the water outlet end of the deaerator 8 is connected to the input end of the feed water pump 10, the feed water pump 10 is connected to the feed water pump turbine 9 through a bearing, the input end of the feed water pump turbine 9 is connected to the exhaust end of the medium-pressure cylinder 3, the output end of the feed water pump 10 is connected to the input end of the high-pressure heater 11, and the output end of the high-pressure heater 11 is connected to the water inlet end of the boiler 1.

[0109] In one embodiment, the molten salt assembly includes: a low-temperature molten salt storage tank 15, a first molten salt heater 19, a second molten salt heater 20, a third molten salt heater 18, a high-temperature molten salt storage tank 22, a first molten salt radiator 24, a second molten salt radiator 27, a third molten salt radiator 26 and a low-pressure heat supply and water mixing tank 14; the output end of the deaerator 8 is respectively connected to the first input end of the low-pressure heat supply and water mixing tank 14 and the low-temperature medium input end of the second molten salt radiator 27, the low-temperature medium output end of the second molten salt radiator 27 is connected to the low-temperature medium input end of the first molten salt radiator 24, the high-temperature medium input end of the second molten salt radiator 27 is connected to the high-temperature medium output end of the first molten salt radiator 24, and the high-temperature medium output end of the second molten salt radiator 27 is connected to the high-temperature medium output end of the first molten salt radiator 24. The medium output end is connected to the input end of the low-temperature molten salt storage tank 15, the high-temperature medium output end of the first molten salt radiator 24 is connected to the high-temperature medium input end of the third molten salt radiator 26, the high-temperature medium output end of the third molten salt radiator 26 is connected to the input end of the low-temperature molten salt storage tank 15, the low-temperature medium input end of the third molten salt radiator 26 is connected to the output end of the low-pressure heating and water supply mixing tank 14, the high-temperature medium input end of the first molten salt radiator 24 is connected to the output end of the high-temperature molten salt storage tank 22, the input end of the high-temperature molten salt storage tank 22 is connected to the low-temperature medium output end of the second molten salt heater 20, the low-temperature medium input end of the second molten salt heater 20 is connected to the low-temperature medium output end of the first molten salt heater 19, and the first molten salt heater 1 The low-temperature medium input end of 9 is connected with the output end of the low-temperature molten salt storage tank 15, the high-temperature medium input end of the first molten salt heater 19 is connected with the second extraction steam end of the medium-pressure cylinder 3, the high-temperature medium output end of the first molten salt heater 19 is connected with the input end of the deaerator 8, the high-temperature medium input end of the second molten salt heater 20 is connected with the first extraction steam end of the medium-pressure cylinder 3, the high-temperature medium output end of the second molten salt heater 20 is connected with the high-temperature medium input end of the third molten salt heater 18, the high-temperature medium output end of the third molten salt heater 18 is connected with the second input end of the low-pressure heating and water supply mixing tank 14, the low-temperature medium input end of the third molten salt heater 18 is connected with the output end of the low-temperature molten salt storage tank 15, and the low-temperature medium output end of the third molten salt heater 18 is connected. The end is connected with the low-temperature medium input end of the second molten salt heater 20; the third molten salt heater 18 is used to heat the pre-stored low-temperature molten salt by using the pre-cooled medium-pressure cylinder one-extraction steam to obtain the medium-pressure cylinder one-extraction steam after two-stage cooling and the molten salt heated by the one-extraction steam; the first molten salt heater 19 is used to heat the pre-stored low-temperature molten salt by using the medium-pressure cylinder two-extraction steam to obtain the cooled medium-pressure cylinder two-extraction steam and the molten salt heated by the two-extraction steam; the second molten salt heater 20 is used to heat the molten salt heated by the steam extraction by using the medium-pressure cylinder one-extraction steam to obtain the pre-cooled medium-pressure cylinder one-extraction steam and high-temperature molten salt; wherein the molten salt heated by the steam extraction is obtained by mixing the molten salt heated by the one-extraction steam and the molten salt heated by the two-extraction steam;The first molten salt radiator 24 is used to heat the pre-heated deoxygenated feed water with high-temperature molten salt to obtain the cooled molten salt and high-parameter external heating steam; the second molten salt radiator 27 is used to heat the deoxygenated feed water with the cooled molten salt to obtain the molten salt after the deoxygenated feed water heat exchange and the pre-heated deoxygenated feed water; the third molten salt radiator 26 is used to heat the cooling water with the cooled molten salt to obtain the molten salt after the cooling water heat exchange and low-parameter external heating steam; wherein the cooling water is obtained by mixing the deoxygenated feed water and the secondary cooling medium pressure cylinder first extraction steam. ;

[0110] In one embodiment, the molten salt component also includes: a low-temperature molten salt pump 16 and a high-temperature molten salt pump 23; the input end of the low-temperature molten salt pump 16 is connected to the output end of the low-temperature molten salt storage tank 15, and the output end of the low-temperature molten salt pump 16 is respectively connected to the low-temperature medium input end of the first molten salt heater 19 and the low-temperature medium input end of the third molten salt heater 18, the input end of the high-temperature molten salt pump 23 is connected to the output end of the high-temperature molten salt storage tank 22, and the output end of the high-temperature molten salt pump 23 is connected to the high-temperature medium input end of the first molten salt radiator 24.

[0111] In one embodiment, the molten salt component also includes: a heating water supply pump 12 and a heating water supply pump turbine 13; the input end of the heating water supply pump 12 is connected to the output end of the deaerator 8, the heating water supply pump 12 is connected to the heating water supply pump turbine 13 through a bearing, the first output end of the heating water supply pump 12 is connected to the low-temperature medium input end of the second molten salt heat releaser 27, and the second output end of the heating water supply pump 12 is connected to the first input end of the low-pressure heating water supply mixing tank 14.

[0112] In one embodiment, the molten salt assembly further includes: a low-temperature molten salt flow control valve 17, a feed water flow control valve 21 and a high-temperature molten salt flow control valve 25;

[0113] The low-temperature molten salt flow control valve 17 is arranged between the output end of the low-temperature molten salt storage tank 15 and the low-temperature medium input end of the third molten salt heater 18, the water supply flow control valve 21 is arranged between the high-temperature medium output end of the third molten salt heater 18 and the second input end of the low-pressure heating and water supply mixing tank 14, and the high-temperature molten salt flow control valve 25 is arranged between the high-temperature medium output end of the first molten salt radiator 24 and the high-temperature medium input end of the third molten salt radiator 26; the low-temperature molten salt flow control valve 17 is used to adjust the molten salt flow at the inlet of the third molten salt radiator input by the low-temperature molten salt storage tank 15 to the third molten salt heater; the water supply flow control valve 21 is used to adjust the flow of the medium-pressure cylinder first extraction steam input by the third molten salt heater 18 to the low-pressure heating and water supply mixing tank 14; the high-temperature molten salt flow control valve 25 is used to adjust the molten salt flow at the inlet of the third molten salt heater input by the first molten salt radiator 24 to the third molten salt radiator 26.

[0114] Specifically, the molten salt component also includes: a data monitoring device and a calculation and analysis device; the data monitoring device is communicatively connected with the calculation and analysis device; the data monitoring device is used to monitor the molten salt flow rate at the inlet of the first molten salt heater, the molten salt flow rate at the inlet of the second molten salt radiator, the flow rate of the second extraction steam of the medium-pressure cylinder, the inlet feed water flow rate of the third molten salt radiator, the inlet feed water flow rate of the first molten salt radiator, the extraction steam temperature of the first extraction steam of the medium-pressure cylinder, the extraction steam temperature of the second extraction steam of the medium-pressure cylinder, the molten salt temperature at the outlet of the low-temperature molten salt storage tank, the molten salt temperature at the outlet of the high-temperature molten salt storage tank, the molten salt temperature at the outlet of the first molten salt heater, and the medium-pressure outlet of the first molten salt heater. Cylinder 2 extraction steam temperature, second molten salt heater outlet medium pressure cylinder 1 extraction steam temperature, third molten salt heater outlet medium pressure cylinder 1 extraction steam temperature, third molten salt heater outlet molten salt temperature, first molten salt radiator outlet molten salt temperature, first molten salt radiator inlet feed water temperature, third molten salt radiator inlet feed water temperature, low parameter heating steam temperature, high parameter heating steam temperature, medium pressure cylinder 1 extraction steam pressure, medium pressure cylinder 2 extraction steam pressure, first molten salt heater outlet medium pressure cylinder 2 extraction steam pressure, first molten salt radiator inlet feed water pressure, second molten salt heater outlet medium pressure cylinder 1 extraction steam pressure, third molten salt radiator inlet feed water pressure, second molten salt heater outlet medium pressure cylinder 1 extraction steam pressure, The feed water pressure at the inlet of the salt radiator, the steam pressure of the first extraction of the intermediate pressure cylinder at the outlet of the third molten salt heater, the low parameter heating steam pressure and the high parameter heating steam pressure; the calculation and analysis device is used to respectively calculate the steam temperature and pressure of the first extraction of the intermediate pressure cylinder, the steam temperature and pressure of the second extraction of the intermediate pressure cylinder, the steam temperature and pressure of the second extraction of the intermediate pressure cylinder at the outlet of the first molten salt heater, the steam temperature and pressure of the first extraction of the intermediate pressure cylinder at the outlet of the second molten salt heater, the steam temperature and pressure of the first extraction of the intermediate pressure cylinder at the outlet of the third molten salt heater, the feed water temperature and pressure at the inlet of the first molten salt radiator, the feed water temperature and pressure at the inlet of the third molten salt radiator, the low parameter heating steam temperature and pressure as well as the high-parameter heating steam temperature and pressure are matched with the preset steam enthalpy value table to determine the enthalpy value of the first extraction steam of the intermediate pressure cylinder, the enthalpy value of the second extraction steam of the intermediate pressure cylinder, the enthalpy value of the second extraction steam of the intermediate pressure cylinder at the outlet of the first molten salt heater, the enthalpy value of the first extraction steam of the intermediate pressure cylinder at the outlet of the second molten salt heater, the enthalpy value of the first extraction steam of the intermediate pressure cylinder at the outlet of the third molten salt heater, the enthalpy value of the first molten salt radiator inlet feed water, the enthalpy value of the third molten salt radiator inlet feed water, the enthalpy value of the low-parameter heating steam and the enthalpy value of the high-parameter heating steam; wherein the preset steam enthalpy value table is used to characterize the mapping relationship between the temperature and pressure of the steam and the enthalpy value;The calculation and analysis device is also used to use the following formula to calculate the molten salt flow rate at the inlet of the first molten salt heater, the molten salt flow rate at the inlet of the second molten salt radiator, the flow rate of the second extraction steam of the medium-pressure cylinder, the inlet feed water flow rate of the third molten salt radiator, the inlet feed water flow rate of the first molten salt radiator, the molten salt temperature at the outlet of the high-temperature molten salt storage tank, the molten salt temperature at the outlet of the low-temperature molten salt storage tank, the molten salt temperature at the outlet of the first molten salt heater, the molten salt temperature at the outlet of the third molten salt heater, the molten salt temperature at the outlet of the first molten salt radiator, the enthalpy value of the low-parameter heating steam, The enthalpy of the feed water at the inlet of the third molten salt radiator, the enthalpy of the feed water at the inlet of the first molten salt radiator, the enthalpy of the high-parameter heating steam, the enthalpy of the second extraction steam of the intermediate pressure cylinder, the enthalpy of the second extraction steam of the intermediate pressure cylinder at the outlet of the first molten salt heater, the enthalpy of the first extraction steam of the intermediate pressure cylinder, the enthalpy of the first extraction steam of the intermediate pressure cylinder, the enthalpy of the first extraction steam of the intermediate pressure cylinder at the outlet of the second molten salt heater and the enthalpy of the first extraction steam of the intermediate pressure cylinder at the outlet of the third molten salt heater are calculated to obtain the molten salt flow rate at the inlet of the third molten salt radiator, the flow rate of the first extraction steam of the intermediate pressure cylinder and the molten salt flow rate at the inlet of the third molten salt heater; Where, q1 represents the molten salt flow rate at the inlet of the third molten salt radiator, t x represents the molten salt temperature at the outlet of the first molten salt heat release device, t0 represents the molten salt temperature at the outlet of the low-temperature molten salt storage tank, u represents the specific heat capacity of the molten salt, k1 represents the heat release efficiency of the molten salt, q L represents the inlet water flow rate of the third molten salt radiator, H L Indicates the enthalpy value of low-parameter heating steam, H L0 represents the enthalpy of the feed water at the inlet of the third molten salt radiator, q2 represents the molten salt flow rate at the inlet of the second molten salt radiator, t T represents the molten salt temperature at the outlet of the high-temperature molten salt storage tank, q H represents the water flow rate at the inlet of the first molten salt radiator, H H Indicates the enthalpy value of high-parameter heating steam, H HL represents the enthalpy of the feed water at the inlet of the first molten salt radiator, q n It represents the flow rate of the steam extracted from the intermediate pressure cylinder, q m represents the flow rate of the second extraction steam of the medium pressure cylinder, q3 represents the flow rate of the molten salt at the inlet of the third molten salt heater, q4 represents the flow rate of the molten salt at the inlet of the first molten salt heater, t y represents the molten salt temperature at the outlet of the third molten salt heater, t zrepresents the molten salt temperature at the outlet of the first molten salt heater, k2 represents the molten salt heat storage efficiency, H1 represents the enthalpy value of the second extraction steam of the medium-pressure cylinder, H2 represents the enthalpy value of the second extraction steam of the medium-pressure cylinder at the outlet of the first molten salt heater, H3 represents the enthalpy value of the first extraction steam of the medium-pressure cylinder, H4 represents the enthalpy value of the first extraction steam of the medium-pressure cylinder at the outlet of the second molten salt heater, and H5 represents the enthalpy value of the first extraction steam of the medium-pressure cylinder at the outlet of the third molten salt heater; the calculation and analysis device is also used to generate a low-temperature molten salt flow control valve opening adjustment instruction, a feed water flow control valve opening adjustment instruction and a high-temperature molten salt flow control valve opening adjustment instruction based on the molten salt flow at the inlet of the third molten salt radiator, the flow of the first extraction steam of the medium-pressure cylinder and the molten salt flow at the inlet of the third molten salt heater; the low-temperature molten salt flow control valve 17 is used to receive When receiving the low-temperature molten salt flow control valve opening adjustment instruction, the opening of the low-temperature molten salt flow control valve 17 is controlled to adjust the molten salt flow at the inlet of the third molten salt radiator input by the low-temperature molten salt storage tank 15 to the third molten salt heater; the feed water flow control valve 21 is used to control the opening of the feed water flow control valve 21 when receiving the feed water flow control valve opening adjustment instruction, so as to adjust the flow of the medium-pressure cylinder extraction steam input by the third molten salt heater 18 to the low-pressure heating and water supply mixing tank 14; the high-temperature molten salt flow control valve 25 is used to control the opening of the high-temperature molten salt flow control valve 25 when receiving the high-temperature molten salt flow control valve opening adjustment instruction, so as to adjust the molten salt flow at the inlet of the third molten salt heater input by the first molten salt radiator 24 to the third molten salt radiator 26.

[0115] Specifically, a preset steam enthalpy value table is given as an example, as shown in Table 1 below:

[0116] Table 1 Preset steam enthalpy table

[0117] Temperature(℃) Pressure(MPa) Enthalpy value (KJ / kg) 80 0.047359 2643.8 85 0.057803 2652.1 90 0.070108 2660.3 95 0.084525 2668.4 100 0.101325 2676.3 110 0.14326 2691.8 120 0.19854 2706.6 130 0.27012 2720.7 140 0.36136 2734 150 0.47597 2746.3 160 0.61804 2757.7 170 0.79202 2768 180 1.0027 2777.1 190 1.2552 2784.9 200 1.5551 2791.4 210 1.9079 2796.4 220 2.3201 2799.9 240 3.348 2801.6 250 3.9776 2799.5 260 4.694 2795.2

[0118] In one embodiment, the data monitoring device includes: a first flow measurement component R1, a second flow measurement component R2, a third flow measurement component R3, a fourth flow measurement component R4 and a fifth flow measurement component R5; the first flow measurement component R1 is arranged between the output end of the low-temperature molten salt storage tank 15 and the low-temperature medium input end of the first molten salt heater 19, the second flow measurement component R2 is arranged between the high-temperature medium output end of the first molten salt radiator 24 and the high-temperature medium input end of the third molten salt radiator 26; the third flow measurement component R3 is arranged between the second extraction steam end of the medium pressure cylinder 3 and the high-temperature medium input end of the first molten salt heater, and the fourth flow measurement component R 4 is arranged between the output end of the low-pressure heating and water supply mixing tank 14 and the low-temperature medium input end of the third molten salt radiator 26, and the fifth flow measurement component R5 is arranged between the output end of the deaerator 8 and the low-temperature medium input end of the first molten salt radiator 24; the first flow measurement component R1 is used to monitor the molten salt flow rate at the inlet of the first molten salt heater; the second flow measurement component R2 is used to monitor the molten salt flow rate at the inlet of the second molten salt radiator; the third flow measurement component R3 is used to monitor the flow rate of the second extraction steam of the medium-pressure cylinder; the fourth flow measurement component R4 is used to monitor the inlet feed water flow rate of the third molten salt radiator; the fifth flow measurement component R5 is used to monitor the inlet feed water flow rate of the first molten salt radiator.

[0119] In one embodiment, the data monitoring device further includes: a first temperature measuring component T1, a second temperature measuring component T2, a third temperature measuring component T3, a fourth temperature measuring component T4, a fifth temperature measuring component T5, a sixth temperature measuring component T6, a seventh temperature measuring component T7, an eighth temperature measuring component T8, a ninth temperature measuring component T9, a tenth temperature measuring component T10, an eleventh temperature measuring component T11, a twelfth temperature measuring component T12, a thirteenth temperature measuring component T13 and a fourteenth temperature measuring component T14; the first temperature measuring component T1 is arranged between the first extraction steam end of the medium pressure cylinder 3 and the high temperature medium input end of the second molten salt heater 20, and the second temperature measuring component T2 is arranged between the second extraction steam end of the medium pressure cylinder 3 The third temperature measuring component T3 is arranged between the output end of the low-temperature molten salt storage tank 15 and the low-temperature medium input end of the first molten salt heater 19, the fourth temperature measuring component T4 is arranged between the output end of the high-temperature molten salt storage tank 22 and the high-temperature medium input end of the first molten salt radiator 24, the fifth temperature measuring component T5 is arranged between the low-temperature medium output end of the first molten salt heater 19 and the low-temperature medium input end of the second molten salt heater 20, the sixth temperature measuring component T6 is arranged between the high-temperature medium output end of the first molten salt heater 19 and the input end of the deaerator 8, the seventh temperature measuring component T7 is arranged between the high-temperature medium output end of the second molten salt heater 20 and the third molten salt heater 21. The eighth temperature measuring component T8 is arranged between the high temperature medium output end of the third molten salt heater 18 and the second input end of the low-pressure heating and water supply mixing tank 14, the ninth temperature measuring component T9 is arranged between the low temperature medium output end of the third molten salt heater 18 and the low temperature medium input end of the second molten salt heater 20, the tenth temperature measuring component T10 is arranged between the high temperature medium output end of the first molten salt radiator 24 and the high temperature medium input end of the second molten salt radiator 27, the eleventh temperature measuring component T11 and the fourteenth temperature measuring component T14 are both arranged at the low temperature medium output end of the second molten salt radiator 27, and the twelfth temperature measuring component T12 is arranged at the low temperature medium output end of the first molten salt radiator 24. The thirteenth temperature measuring component T13 is arranged at the low-temperature medium output end of the third molten salt radiator 26 between the input end and the output end of the deaerator 8; the first temperature measuring component T1 is used to monitor the medium-pressure cylinder one extraction steam temperature; the second temperature measuring component T2 is used to monitor the medium-pressure cylinder two extraction steam temperature; the third temperature measuring component T3 is used to monitor the molten salt temperature at the outlet of the low-temperature molten salt storage tank; the fourth temperature measuring component T4 is used to monitor the molten salt temperature at the outlet of the high-temperature molten salt storage tank; the fifth temperature measuring component T5 is used to monitor the molten salt temperature at the outlet of the first molten salt heater; the sixth temperature measuring component T6 is used to monitor the medium-pressure cylinder two extraction steam temperature at the outlet of the first molten salt heater; the seventh temperature measuring component T7 is used to monitor the medium-pressure cylinder one extraction steam temperature at the outlet of the second molten salt heater;The eighth temperature measurement component T8 is used to monitor the temperature of the first extraction steam of the intermediate pressure cylinder at the outlet of the third molten salt heater; the ninth temperature measurement component T9 is used to monitor the temperature of the molten salt at the outlet of the third molten salt heater; the tenth temperature measurement component T10 is used to monitor the temperature of the molten salt at the outlet of the first molten salt radiator; the eleventh temperature measurement component T11 is used to monitor the feed water temperature at the inlet of the first molten salt radiator; the twelfth temperature measurement component T12 is used to monitor the feed water temperature at the inlet of the third molten salt radiator; the thirteenth temperature measurement component T13 is used to monitor the temperature of the low-parameter heating steam; the fourteenth temperature measurement component T14 is used to monitor the temperature of the high-parameter heating steam. ;

[0120] In one embodiment, the data monitoring device also includes: a first pressure measuring component P1, a second pressure measuring component P2, a third pressure measuring component P3, a fourth pressure measuring component P4, a fifth pressure measuring component P5, a sixth pressure measuring component P6, a seventh pressure measuring component P7, an eighth pressure measuring component P8 and a ninth pressure measuring component P9; the first pressure measuring component P1 is arranged between the first extraction steam end of the medium pressure cylinder 3 and the high temperature medium input end of the second molten salt heater 20, and the second pressure measuring component P2 is arranged between the second extraction steam end of the medium pressure cylinder 3 and the first molten salt heater The third pressure measuring component P3 is arranged between the high-temperature medium output end of the first molten salt heater 19 and the input end of the deaerator 8, the fourth pressure measuring component P4 is arranged between the low-temperature medium output end of the second molten salt radiator 27 and the low-temperature medium input end of the first molten salt radiator 24, the fifth pressure measuring component P5 is arranged between the high-temperature medium output end of the second molten salt heater 20 and the high-temperature medium input end of the third molten salt heater 18, and the sixth pressure measuring component P6 is arranged between the output end of the low-pressure heating and water supply mixing tank 14 and the input end of the third molten salt radiator The seventh pressure measuring component P7 is arranged between the high temperature medium output end of the third molten salt heater 18 and the second input end of the low pressure heating and water supply mixing tank 14, the eighth pressure measuring component P8 is arranged at the low temperature medium output end of the third molten salt radiator 26, and the ninth pressure measuring component P9 is arranged at the low temperature medium output end of the second molten salt radiator 27; the first pressure measuring component P1 is used to monitor the steam extraction pressure of the medium pressure cylinder 1; the second pressure measuring component P2 is used to monitor the steam extraction pressure of the medium pressure cylinder 2; the third pressure measuring component P3 is used to monitor The second extraction steam pressure of the intermediate pressure cylinder at the outlet of the first molten salt heater; the fourth pressure measuring assembly P4 is used to monitor the inlet water supply pressure of the first molten salt radiator; the fifth pressure measuring assembly P5 is used to monitor the first extraction steam pressure of the intermediate pressure cylinder at the outlet of the second molten salt heater; the sixth pressure measuring assembly P6 is used to monitor the inlet water supply pressure of the third molten salt radiator; the seventh pressure measuring assembly P7 is used to monitor the first extraction steam pressure of the intermediate pressure cylinder at the outlet of the third molten salt heater; the eighth pressure measuring assembly P8 is used to monitor the low parameter heating steam pressure; the ninth pressure measuring assembly P9 is used to monitor the high parameter heating steam pressure.

[0121] In order to better understand the present invention, the following distance description is combined with actual data:

[0122] Assume that a 1000MW ultra-supercritical single-reheat unit needs to supply heat to the outside. The main parameters of the heat supply are shown in Table 2 below.

[0123] Table 2 External heating parameters

[0124]

[0125]

[0126] According to the heating parameters, the molten salt is selected as a ternary molten salt, the operating temperature range of the molten salt is 185°C-450°C, and the specific heat capacity of the molten salt is 1.55 kJ / (kg.k).

[0127] When the unit is under 75% operating load, the main parameters of the low-pressure heating main feed water and high-pressure heating feed water entering the molten salt heat release system are shown in Table 3 below.

[0128] Table 3 External heating water supply parameters

[0129] Parameter name unit High parameter heating Low parameter heating Water supply pressure MPa 4.75 1.9 Feed water temperature ℃ 180 180 Feed water enthalpy kJ / kg 765.09 763.64 Water flow t / h 300 400

[0130] After the low-parameter heating water passes through the second molten salt heat release device 27, the low-parameter heating water meets the user's needs. After the high-parameter heating water passes through the third molten salt heat release device 26, the temperature is the same as the low-parameter heating, both of which are 290° C. The efficiency of the molten salt heat release system is set to 90%.

[0131] Through the heat balance of the first molten salt heat releaser 24, the second molten salt heat releaser 27 and the third molten salt heat releaser 26, the temperature of the molten salt after heat release by the first molten salt heat releaser 24 is calculated, and the flow rate entering the second molten salt heat releaser 27 and the third molten salt heat releaser 26 is controlled. The main results are shown in Table 4 below.

[0132] Table 4 Molten salt heat release system

[0133]

[0134] The two steam sources selected for the unit are primary extraction steam and secondary extraction steam. The efficiency of the molten salt heat release system is 90%. Under 75% operating load, the maximum flow rate of secondary extraction steam is 450t / h. The main parameters after heat release are shown in Figure 5.

[0135] Table 5 Main parameters of primary extraction steam and secondary extraction steam

[0136]

[0137]

[0138] The difference between the steam temperature entering the second molten salt heater 20 and the outlet temperature of the second molten salt heater 20 is selected to be 6°C. Through iterative calculation, the steam temperature entering the second molten salt heater 20, the outlet temperature of the second molten salt heater 20, the extraction steam flow rate and the molten salt flow rate entering the first molten salt heater 19 and the third molten salt heater 18 are obtained. The specific results are shown in Table 6 below.

[0139] Table 6 Molten salt heating system

[0140] Parameter name unit Key results Extraction steam flow t / h 296.93 Steam temperature entering the second molten salt heater ℃ 442.06 The outlet temperature of the second molten salt heater ℃ 436.06 Molten salt flow rate entering the first molten salt heater t / h 2737.32 Molten salt flow rate entering the third molten salt heater t / h 1722.19

[0141] After the secondary heat release, the first extraction steam returns to the low-pressure heating water mixing tank 14, with a flow rate of 296.93 t / h. The pressure and flow rate of the tap low-pressure heating water in the heating water supply system are 1.9 MPa and 103.07 t / h respectively, and the outlet temperature of the low-pressure heating water mixing tank is 180°C. The pressure, temperature and flow rate of the high-pressure heating water at the outlet of the feed water pump in the heating water supply system are 4.75 MPa, 180°C and 300 t / h respectively.

[0142] Beneficial effects of the present invention:

[0143] In the embodiment of the present invention, a molten salt heating system is added to the thermal power unit for the large-flow, multi-parameter external heating operation mode, so that the unit can achieve thermal and electrical decoupling, which significantly improves the flexibility of the unit, meets the user's needs for heating with different parameters, ensures the heating capacity of the unit under different loads, and improves the economy of the unit.

[0144] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A molten salt heating system for a thermal power unit, characterized in that: include: A steam turbine unit and a molten salt component; a first steam inlet end of the molten salt component is connected to a first steam extraction end of the steam turbine unit, a second end of the molten salt component is connected to a second steam extraction end of the steam turbine unit, a water outlet end of the molten salt component is connected to a water inlet end of the steam turbine unit, and a water inlet end of the molten salt component is connected to a water outlet end of the steam turbine unit; The steam turbine unit is used to discharge the extraction steam of the intermediate pressure cylinder 1 and the extraction steam of the intermediate pressure cylinder 2, and to generate exhaust steam return water of the low pressure cylinder; The molten salt component is used to heat the pre-stored low-temperature molten salt by using the pre-cooled medium-pressure cylinder first extraction steam to obtain the second-stage cooled medium-pressure cylinder first extraction steam and the molten salt heated by the first extraction steam; The molten salt assembly is also used to heat the pre-stored low-temperature molten salt using the secondary extraction steam of the medium-pressure cylinder to obtain the cooled secondary extraction steam of the medium-pressure cylinder and the molten salt heated by the secondary extraction steam; The molten salt assembly is also used to heat the molten salt heated by the extraction steam using the extraction steam of the intermediate pressure cylinder, so as to obtain the pre-cooled extraction steam of the intermediate pressure cylinder and the high-temperature molten salt; wherein the molten salt heated by the extraction steam is obtained by mixing the molten salt heated by the first extraction steam and the molten salt heated by the second extraction steam; The steam turbine unit is also used to mix the cooled secondary extraction steam from the intermediate pressure cylinder with the exhaust steam return water from the low pressure cylinder and then deoxygenate it to obtain deoxygenated feed water; The molten salt component is also used to heat the pre-heated deoxygenated feed water with high-temperature molten salt to obtain cooled molten salt and high-parameter external heating steam; The molten salt component is also used to heat the deoxygenated feed water with the cooled molten salt to obtain the molten salt after the deoxygenated feed water heat exchange and the pre-heated deoxygenated feed water; The molten salt component is also used to heat the cooling water with the cooled molten salt, and obtain the molten salt after the cooling water heat exchange and the low-parameter external heating steam; wherein the cooling water is obtained by mixing the deoxygenated feed water and the first extraction steam of the intermediate pressure cylinder after the second stage cooling; The molten salt component is also used to mix the molten salt obtained after heat exchange with the deoxygenated feed water and the molten salt obtained after heat exchange with the cooling water to obtain pre-stored low-temperature molten salt.

2. The molten salt heating system for a thermal power plant according to claim 1, characterized in that: The steam turbine unit comprises: a boiler (1), a medium-pressure cylinder (3), a low-pressure cylinder (4), a low-pressure heater (7), a deaerator (8), a feedwater pump turbine (9) and a feedwater pump (10); The hot re-steam exhaust end of the boiler (1) is connected to the first extraction end of the medium pressure cylinder (3), the third extraction end of the medium pressure cylinder (3) is connected to the steam inlet end of the low pressure cylinder (4), the output end of the low pressure heater (7) is connected to the water inlet end of the deaerator (8), the steam inlet end of the deaerator (8) is connected to the exhaust end of the medium pressure cylinder (3), the water outlet end of the deaerator (8) is connected to the input end of the feed water pump (10), and the input end of the feed water pump turbine (9) is connected to the exhaust end of the medium pressure cylinder (3).

3. The molten salt heating system for a thermal power plant according to claim 2, characterized in that: The molten salt assembly comprises: a low-temperature molten salt storage tank (15), a first molten salt heater (19), a second molten salt heater (20), a third molten salt heater (18), a high-temperature molten salt storage tank (22), a first molten salt radiator (24), a second molten salt radiator (27), a third molten salt radiator (26) and a low-pressure heat supply and water mixing tank (14); The output end of the deaerator (8) is respectively connected to the first input end of the low-pressure heating water supply mixing tank (14) and the low-temperature medium input end of the second molten salt radiator (27); the low-temperature medium output end of the second molten salt radiator (27) is connected to the low-temperature medium input end of the first molten salt radiator (24); the high-temperature medium input end of the second molten salt radiator (27) is connected to the high-temperature medium output end of the first molten salt radiator (24); the high-temperature medium output end of the second molten salt radiator (27) is connected to the input end of the low-temperature molten salt storage tank (15); the first molten salt radiator (24) is connected to the low-temperature medium input end of the first molten salt radiator (24); the high-temperature medium output end of the second molten salt radiator (27) is connected to the input end of the low-temperature molten salt storage tank (15); the first molten salt radiator (24) is connected to the low-temperature medium input end of the second molten salt radiator (27 ...4); the high-temperature medium output end of the second molten salt radiator (27) is connected to the input end of the low-temperature molten salt storage tank (15); the first molten salt radi The high-temperature medium output end of the salt radiator (24) is connected to the high-temperature medium input end of the third molten salt radiator (26), the high-temperature medium output end of the third molten salt radiator (26) is connected to the input end of the low-temperature molten salt storage tank (15), the low-temperature medium input end of the third molten salt radiator (26) is connected to the output end of the low-pressure heating and water supply mixing tank (14), the high-temperature medium input end of the first molten salt radiator (24) is connected to the output end of the high-temperature molten salt storage tank (22), and the input end of the high-temperature molten salt storage tank (22) is connected to the second molten salt heater (2 The low-temperature medium output end of the second molten salt heater (20) is connected to the low-temperature medium output end of the first molten salt heater (19), the low-temperature medium input end of the first molten salt heater (19) is connected to the output end of the low-temperature molten salt storage tank (15), the high-temperature medium input end of the first molten salt heater (19) is connected to the second extraction steam end of the medium-pressure cylinder (3), the high-temperature medium output end of the first molten salt heater (19) is connected to the input end of the deaerator (8), and the high-temperature medium input end of the second molten salt heater (20) is connected to the high-temperature medium input end of the second molten salt heater (20). The high-temperature medium output end of the second molten salt heater (20) is connected to the high-temperature medium input end of the third molten salt heater (18), the high-temperature medium output end of the third molten salt heater (18) is connected to the second input end of the low-pressure heat supply and water supply mixing tank (14), the low-temperature medium input end of the third molten salt heater (18) is connected to the output end of the low-temperature molten salt storage tank (15), and the low-temperature medium output end of the third molten salt heater (18) is connected to the low-temperature medium input end of the second molten salt heater (20); The third molten salt heater (18) is used to heat the pre-stored low-temperature molten salt using the pre-cooled medium-pressure cylinder first extraction steam to obtain the second-stage cooled medium-pressure cylinder first extraction steam and the molten salt heated by the first extraction steam; The first molten salt heater (19) is used to heat the pre-stored low-temperature molten salt using the secondary extraction steam of the medium-pressure cylinder to obtain the secondary extraction steam of the medium-pressure cylinder after cooling and the molten salt heated by the secondary extraction steam; The second molten salt heater (20) is used to heat the molten salt heated by the extraction steam using the extraction steam of the intermediate pressure cylinder, so as to obtain the intermediate pressure cylinder extraction steam after pre-cooling and high-temperature molten salt; wherein the molten salt heated by the extraction steam is obtained by mixing the molten salt heated by the first extraction steam and the molten salt heated by the second extraction steam; The first molten salt radiator (24) is used to heat the pre-heated deoxygenated feed water with high-temperature molten salt to obtain cooled molten salt and high-parameter external heating steam; The second molten salt heat release device (27) is used to heat the deoxygenated feed water with the cooled molten salt to obtain the molten salt after the deoxygenated feed water heat exchange and the pre-heated deoxygenated feed water; The third molten salt heat releaser (26) is used to heat the cooling water with the cooled molten salt to obtain the molten salt after the cooling water heat exchange and the low-parameter external heating steam; wherein the cooling water is obtained by mixing the deoxygenated feed water and the intermediate pressure cylinder first extraction steam after the second stage cooling.

4. The molten salt heating system for thermal power generation units according to claim 3, characterized in that: The molten salt assembly also includes: a low-temperature molten salt pump (16) and a high-temperature molten salt pump (23); The input end of the low-temperature molten salt pump (16) is connected to the output end of the low-temperature molten salt storage tank (15), the output end of the low-temperature molten salt pump (16) is respectively connected to the low-temperature medium input end of the first molten salt heater (19) and the low-temperature medium input end of the third molten salt heater (18), the input end of the high-temperature molten salt pump (23) is connected to the output end of the high-temperature molten salt storage tank (22), and the output end of the high-temperature molten salt pump (23) is connected to the high-temperature medium input end of the first molten salt radiator (24).

5. The molten salt heating system for thermal power generation units according to claim 3, characterized in that: The molten salt assembly also includes: a heating feed water pump (12) and a heating feed water pump steam turbine (13); The input end of the heating water supply pump (12) is connected to the output end of the deaerator (8), the heating water supply pump (12) is connected to the heating water supply pump turbine (13) through a bearing, the first output end of the heating water supply pump (12) is connected to the low-temperature medium input end of the second molten salt radiator (27), and the second output end of the heating water supply pump (12) is connected to the first input end of the low-pressure heating water supply mixing tank (14).

6. The molten salt heating system for thermal power generation units according to claim 3, characterized in that: The molten salt assembly also includes: a low-temperature molten salt flow control valve (17), a water supply flow control valve (21) and a high-temperature molten salt flow control valve (25); The low-temperature molten salt flow control valve (17) is arranged between the output end of the low-temperature molten salt storage tank (15) and the low-temperature medium input end of the third molten salt heater (18), the water supply flow control valve (21) is arranged between the high-temperature medium output end of the third molten salt heater (18) and the second input end of the low-pressure heating and water supply mixing tank (14), and the high-temperature molten salt flow control valve (25) is arranged between the high-temperature medium output end of the first molten salt radiator (24) and the high-temperature medium input end of the third molten salt radiator (26); The low-temperature molten salt flow control valve (17) is used to adjust the molten salt flow rate at the inlet of the third molten salt radiator inputted from the low-temperature molten salt storage tank (15) into the third molten salt heater; The feedwater flow control valve (21) is used to adjust the flow of the medium-pressure cylinder-one extraction steam inputted into the low-pressure heating feedwater mixing tank (14) by the third molten salt heater (18); The high-temperature molten salt flow control valve (25) is used to adjust the molten salt flow at the inlet of the third molten salt heater input from the first molten salt radiator (24) to the third molten salt radiator (26).

7. The molten salt heating system for a thermal power plant according to claim 6, characterized in that: The molten salt assembly also includes: a data monitoring device and a computing and analyzing device; the data monitoring device is communicatively connected with the computing and analyzing device; The data monitoring device is used to monitor the molten salt flow rate at the inlet of the first molten salt heater, the molten salt flow rate at the inlet of the second molten salt radiator, the flow rate of the second extraction steam of the medium pressure cylinder, the inlet feed water flow rate of the third molten salt radiator, the inlet feed water flow rate of the first molten salt radiator, the first extraction steam temperature of the medium pressure cylinder, the second extraction steam temperature of the medium pressure cylinder, the molten salt temperature at the outlet of the low-temperature molten salt storage tank, the molten salt temperature at the outlet of the high-temperature molten salt storage tank, the molten salt temperature at the outlet of the first molten salt heater, the second extraction steam temperature of the medium pressure cylinder at the outlet of the first molten salt heater, the first extraction steam temperature of the medium pressure cylinder at the outlet of the second molten salt heater, the first extraction steam temperature of the medium pressure cylinder at the outlet of the third molten salt heater, and the The molten salt temperature at the outlet of the third molten salt heater, the molten salt temperature at the outlet of the first molten salt radiator, the feed water temperature at the inlet of the first molten salt radiator, the feed water temperature at the inlet of the third molten salt radiator, the low parameter heating steam temperature, the high parameter heating steam temperature, the extraction steam pressure of the intermediate pressure cylinder 1, the extraction steam pressure of the intermediate pressure cylinder 2, the extraction steam pressure of the intermediate pressure cylinder 2 at the outlet of the first molten salt heater, the feed water pressure at the inlet of the first molten salt radiator, the extraction steam pressure of the intermediate pressure cylinder 1 at the outlet of the second molten salt heater, the feed water pressure at the inlet of the third molten salt radiator, the extraction steam pressure of the intermediate pressure cylinder 1 at the outlet of the third molten salt heater, the low parameter heating steam pressure and the high parameter heating steam pressure; The calculation and analysis device is used to respectively compare the extraction steam temperature and pressure of the intermediate pressure cylinder 1, the extraction steam temperature and pressure of the intermediate pressure cylinder 2, the extraction steam temperature and pressure of the intermediate pressure cylinder 2 at the outlet of the first molten salt heater, the extraction steam temperature and pressure of the intermediate pressure cylinder 1 at the outlet of the second molten salt heater, the extraction steam temperature and pressure of the intermediate pressure cylinder 1 at the outlet of the third molten salt heater, the feed water temperature and pressure of the first molten salt radiator inlet, the feed water temperature and pressure of the third molten salt radiator inlet, the low parameter heating steam temperature and pressure, and the high parameter heating steam temperature and pressure with the preset steam enthalpy value table Matching is performed to determine the enthalpy value of the steam extracted from the intermediate pressure cylinder 1, the enthalpy value of the steam extracted from the intermediate pressure cylinder 2, the enthalpy value of the steam extracted from the intermediate pressure cylinder 2 at the outlet of the first molten salt heater, the enthalpy value of the steam extracted from the intermediate pressure cylinder 1 at the outlet of the second molten salt heater, the enthalpy value of the steam extracted from the intermediate pressure cylinder 1 at the outlet of the third molten salt heater, the enthalpy value of the feed water at the inlet of the first molten salt radiator, the enthalpy value of the feed water at the inlet of the third molten salt radiator, the enthalpy value of the low-parameter heating steam, and the enthalpy value of the high-parameter heating steam; wherein the preset steam enthalpy value table is used to characterize the mapping relationship between the temperature and pressure of the steam and the enthalpy value; The calculation and analysis device is also used to use the following formula to calculate the molten salt flow rate at the inlet of the first molten salt heater, the molten salt flow rate at the inlet of the second molten salt radiator, the flow rate of the second extraction steam of the medium-pressure cylinder, the inlet feed water flow rate of the third molten salt radiator, the inlet feed water flow rate of the first molten salt radiator, the molten salt temperature at the outlet of the high-temperature molten salt storage tank, the molten salt temperature at the outlet of the low-temperature molten salt storage tank, the molten salt temperature at the outlet of the first molten salt heater, the molten salt temperature at the outlet of the third molten salt heater, the molten salt temperature at the outlet of the first molten salt radiator, the enthalpy value of the low-parameter heating steam, The enthalpy of the feed water at the inlet of the third molten salt radiator, the enthalpy of the feed water at the inlet of the first molten salt radiator, the enthalpy of the high-parameter heating steam, the enthalpy of the second extraction steam of the intermediate pressure cylinder, the enthalpy of the second extraction steam of the intermediate pressure cylinder at the outlet of the first molten salt heater, the enthalpy of the first extraction steam of the intermediate pressure cylinder, the enthalpy of the first extraction steam of the intermediate pressure cylinder, the enthalpy of the first extraction steam of the intermediate pressure cylinder at the outlet of the second molten salt heater and the enthalpy of the first extraction steam of the intermediate pressure cylinder at the outlet of the third molten salt heater are calculated to obtain the molten salt flow rate at the inlet of the third molten salt radiator, the flow rate of the first extraction steam of the intermediate pressure cylinder and the molten salt flow rate at the inlet of the third molten salt heater; Where, q1 represents the molten salt flow rate at the inlet of the third molten salt radiator, t x represents the molten salt temperature at the outlet of the first molten salt heat release device, t0 represents the molten salt temperature at the outlet of the low-temperature molten salt storage tank, u represents the specific heat capacity of the molten salt, k1 represents the heat release efficiency of the molten salt, q L represents the inlet feed water flow rate of the third molten salt radiator, H L Indicates the enthalpy value of low-parameter heating steam, H L0 represents the enthalpy of the water at the inlet of the third molten salt radiator, q2 represents the molten salt flow rate at the inlet of the second molten salt radiator, t T represents the molten salt temperature at the outlet of the high-temperature molten salt storage tank, q H represents the water flow rate at the inlet of the first molten salt radiator, H H Indicates the enthalpy value of high-parameter heating steam, H HL represents the enthalpy of the feed water at the inlet of the first molten salt radiator, q n It represents the flow rate of the steam extracted from the intermediate pressure cylinder, q m represents the flow rate of the second extraction steam of the medium pressure cylinder, q3 represents the flow rate of the molten salt at the inlet of the third molten salt heater, q4 represents the flow rate of the molten salt at the inlet of the first molten salt heater, t y represents the molten salt temperature at the outlet of the third molten salt heater, t z represents the molten salt temperature at the outlet of the first molten salt heater, k2 represents the molten salt heat storage efficiency, H1 represents the enthalpy value of the second extraction steam from the intermediate pressure cylinder, H2 represents the enthalpy value of the second extraction steam from the intermediate pressure cylinder at the outlet of the first molten salt heater, H3 represents the enthalpy value of the first extraction steam from the intermediate pressure cylinder, H4 represents the enthalpy value of the first extraction steam from the intermediate pressure cylinder at the outlet of the second molten salt heater, and H5 represents the enthalpy value of the first extraction steam from the intermediate pressure cylinder at the outlet of the third molten salt heater; The calculation and analysis device is also used to generate a low-temperature molten salt flow control valve opening adjustment instruction, a feedwater flow control valve opening adjustment instruction and a high-temperature molten salt flow control valve opening adjustment instruction based on the molten salt flow at the inlet of the third molten salt radiator, the flow of the first extraction steam of the medium-pressure cylinder and the molten salt flow at the inlet of the third molten salt heater; The low-temperature molten salt flow control valve (17) is used to control the opening of the low-temperature molten salt flow control valve (17) when receiving a low-temperature molten salt flow control valve opening adjustment instruction, so as to adjust the molten salt flow at the inlet of the third molten salt radiator inputted from the low-temperature molten salt storage tank (15) to the third molten salt heater; The feedwater flow control valve (21) is used to control the opening of the feedwater flow control valve (21) when receiving a feedwater flow control valve opening adjustment instruction, so as to adjust the flow rate of the medium-pressure cylinder first extraction steam input by the third molten salt heater (18) into the low-pressure heating feedwater mixing tank (14); The high-temperature molten salt flow control valve (25) is used to control the opening of the high-temperature molten salt flow control valve (25) when receiving a high-temperature molten salt flow control valve opening adjustment instruction, so as to adjust the molten salt flow at the inlet of the third molten salt heater input from the first molten salt radiator (24) to the third molten salt radiator (26).

8. The molten salt heating system for thermal power generation units according to claim 7, characterized in that: The data monitoring device comprises: a first flow measurement component (R1), a second flow measurement component (R2), a third flow measurement component (R3), a fourth flow measurement component (R4) and a fifth flow measurement component (R5); The first flow measurement component (R1) is arranged between the output end of the low-temperature molten salt storage tank (15) and the low-temperature medium input end of the first molten salt heater (19), and the second flow measurement component (R2) is arranged between the high-temperature medium output end of the first molten salt radiator (24) and the high-temperature medium input end of the third molten salt radiator (26); The third flow measurement component (R3) is arranged between the second extraction steam end of the medium pressure cylinder (3) and the high temperature medium input end of the first molten salt heater, the fourth flow measurement component (R4) is arranged between the output end of the low pressure heating water supply mixing tank (14) and the low temperature medium input end of the third molten salt radiator (26), and the fifth flow measurement component (R5) is arranged between the output end of the deaerator (8) and the low temperature medium input end of the first molten salt radiator (24); The first flow measurement component (R1) is used to monitor the molten salt flow at the inlet of the first molten salt heater; The second flow measurement component (R2) is used to monitor the inlet molten salt flow rate of the second molten salt radiator; The third flow measurement component (R3) is used to monitor the flow rate of the secondary extraction steam of the intermediate pressure cylinder; The fourth flow measurement component (R4) is used to monitor the inlet feed water flow of the third molten salt radiator; The fifth flow measurement component (R5) is used to monitor the water feed flow at the inlet of the first molten salt radiator.

9. The molten salt heating system for thermal power generation units according to claim 7, characterized in that: The data monitoring device also includes: a first temperature measuring component (T1), a second temperature measuring component (T2), a third temperature measuring component (T3), a fourth temperature measuring component (T4), a fifth temperature measuring component (T5), a sixth temperature measuring component (T6), a seventh temperature measuring component (T7), an eighth temperature measuring component (T8), a ninth temperature measuring component (T9), a tenth temperature measuring component (T10), an eleventh temperature measuring component (T11), a twelfth temperature measuring component (T12), a thirteenth temperature measuring component (T13) and a fourteenth temperature measuring component (T14); The first temperature measuring component (T1) is arranged between the first extraction steam end of the medium pressure cylinder (3) and the high temperature medium input end of the second molten salt heater (20), the second temperature measuring component (T2) is arranged between the second extraction steam end of the medium pressure cylinder (3) and the high temperature medium input end of the first molten salt heater (19), the third temperature measuring component (T3) is arranged between the output end of the low temperature molten salt storage tank (15) and the low temperature medium input end of the first molten salt heater (19), the fourth temperature measuring component (T4) is arranged between the output end of the high temperature molten salt storage tank (22) and the high temperature medium input end of the first molten salt radiator (24), the fifth temperature measuring component (T5) is arranged between the low temperature medium output end of the first molten salt heater (19) and the low temperature medium input end of the second molten salt heater (20), the sixth temperature measuring component (T6) is arranged between the high temperature medium output end of the first molten salt heater (19) and the input end of the deaerator (8), and the seventh temperature measuring component (T7) is arranged between the high temperature medium output end of the second molten salt heater (20). The temperature measuring component (T8) is arranged between the high-temperature medium output end of the third molten salt heater (18) and the high-temperature medium input end of the third molten salt heater (18), the eighth temperature measuring component (T8) is arranged between the high-temperature medium output end of the third molten salt heater (18) and the second input end of the low-pressure heat supply and water mixing tank (14), the ninth temperature measuring component (T9) is arranged between the low-temperature medium output end of the third molten salt heater (18) and the low-temperature medium input end of the second molten salt heater (20), and the tenth temperature measuring component (T10) is arranged between the first molten salt radiator (24) and the low-temperature medium output end of the third molten salt heater (18). The eleventh temperature measuring component (T11) and the fourteenth temperature measuring component (T14) are both arranged at the low-temperature medium output end of the second molten salt radiator (27) between the high-temperature medium output end and the high-temperature medium input end of the second molten salt radiator (27), the twelfth temperature measuring component (T12) is arranged between the low-temperature medium input end of the first molten salt radiator (24) and the output end of the deaerator (8), and the thirteenth temperature measuring component (T13) is arranged at the low-temperature medium output end of the third molten salt radiator (26); The first temperature measuring assembly (T1) is used to monitor the extraction steam temperature of the intermediate pressure cylinder; The second temperature measuring component (T2) is used to monitor the temperature of the secondary extraction steam of the intermediate pressure cylinder; The third temperature measurement component (T3) is used to monitor the molten salt temperature at the outlet of the low-temperature molten salt storage tank; The fourth temperature measuring component (T4) is used to monitor the molten salt temperature at the outlet of the high-temperature molten salt storage tank; The fifth temperature measuring component (T5) is used to monitor the molten salt temperature at the outlet of the first molten salt heater; The sixth temperature measurement component (T6) is used to monitor the temperature of the second extraction steam of the intermediate pressure cylinder at the outlet of the first molten salt heater; The seventh temperature measuring component (T7) is used to monitor the extraction steam temperature of the intermediate pressure cylinder at the outlet of the second molten salt heater; The eighth temperature measuring component (T8) is used to monitor the extraction steam temperature of the intermediate pressure cylinder at the outlet of the third molten salt heater; The ninth temperature measuring component (T9) is used to monitor the molten salt temperature at the outlet of the third molten salt heater; The tenth temperature measuring component (T10) is used to monitor the molten salt temperature at the outlet of the first molten salt radiator; The eleventh temperature measuring component (T11) is used to monitor the inlet feed water temperature of the first molten salt radiator; The twelfth temperature measuring component (T12) is used to monitor the inlet feed water temperature of the third molten salt radiator; The thirteenth temperature measuring component (T13) is used to monitor the low parameter heating steam temperature; The fourteenth temperature measuring component (T14) is used to monitor the high parameter heating steam temperature.

10. The molten salt heating system for thermal power generation units according to claim 7, characterized in that: The data monitoring device also includes: a first pressure measuring component (P1), a second pressure measuring component (P2), a third pressure measuring component (P3), a fourth pressure measuring component (P4), a fifth pressure measuring component (P5), a sixth pressure measuring component (P6), a seventh pressure measuring component (P7), an eighth pressure measuring component (P8) and a ninth pressure measuring component (P9); The first pressure measuring assembly (P1) is arranged between the first extraction steam end of the medium pressure cylinder (3) and the high temperature medium input end of the second molten salt heater (20), the second pressure measuring assembly (P2) is arranged between the second extraction steam end of the medium pressure cylinder (3) and the high temperature medium input end of the first molten salt heater (19), the third pressure measuring assembly (P3) is arranged between the high temperature medium output end of the first molten salt heater (19) and the input end of the deaerator (8), the fourth pressure measuring assembly (P4) is arranged between the low temperature medium output end of the second molten salt radiator (27) and the low temperature medium input end of the first molten salt radiator (24), and the fifth pressure measuring assembly (P5) is arranged between the second molten salt radiator (27) and the low temperature medium input end of the first molten salt radiator (24). The high-temperature medium output end of the salt heater (20) and the high-temperature medium input end of the third molten salt heater (18), the sixth pressure measuring component (P6) is arranged between the output end of the low-pressure heat supply and water supply mixing tank (14) and the low-temperature medium input end of the third molten salt radiator (26), the seventh pressure measuring component (P7) is arranged between the high-temperature medium output end of the third molten salt heater (18) and the second input end of the low-pressure heat supply and water supply mixing tank (14), the eighth pressure measuring component (P8) is arranged at the low-temperature medium output end of the third molten salt radiator (26), and the ninth pressure measuring component (P9) is arranged at the low-temperature medium output end of the second molten salt radiator (27); The first pressure measuring assembly (P1) is used to monitor the extraction steam pressure of the intermediate pressure cylinder; The second pressure measuring assembly (P2) is used to monitor the secondary extraction steam pressure of the intermediate pressure cylinder; The third pressure measurement assembly (P3) is used to monitor the secondary extraction steam pressure of the intermediate pressure cylinder at the outlet of the first molten salt heater; The fourth pressure measuring assembly (P4) is used to monitor the water supply pressure at the inlet of the first molten salt radiator; The fifth pressure measuring assembly (P5) is used to monitor the steam pressure of the intermediate pressure cylinder at the outlet of the second molten salt heater; The sixth pressure measurement assembly (P6) is used to monitor the inlet water pressure of the third molten salt radiator; The seventh pressure measurement assembly (P7) is used to monitor the steam pressure of the intermediate pressure cylinder at the outlet of the third molten salt heater; The eighth pressure measurement assembly (P8) is used to monitor the low parameter heating steam pressure; The ninth pressure measurement assembly (P9) is used to monitor the high parameter heating steam pressure.

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