Flexible heat supply and control system for heating molten salt produced by coupling thermal power generation system with solid caustic soda

Abstract

The invention discloses a thermal power generation system coupling solid caustic soda production fused salt heating flexible heat supply and control system, which relates to the technical field of thermal power generation and comprises a boiler, a steam turbine body, a generator, a control system group, a fused salt heating device, a temperature and pressure reduction device I and a temperature and pressure reduction device II, a first electric shut-off valve, an electric adjusting valve and a second electric shut-off valve are sequentially installed between the boiler and the fused salt heating device, and a sixth electric shut-off valve and a seventh electric shut-off valve are installed between the fused salt heating device and the control system set. According to the thermal power generation system coupling solid caustic soda production fused salt heating flexible heat supply and control system, in the fused salt heating process, fused salt in the heating box is circulated, so that the fused salt is gradually guided into the space between the partition ring plate and the inner side wall of the heating box, the fused salt makes close contact with the coupling heating mechanism, and the heating efficiency is improved. And therefore, the molten salt in the heating box is circularly heated, the heating efficiency is improved, and the effect that the molten salt in the heating box is completely heated is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and in particular to a flexible heating and control system for a thermal power generation system coupled with solid alkali production and molten salt heating. Background Art

[0002] In recent years, the installed capacity of new energy such as wind power, photovoltaics, and hydropower in my country has grown rapidly. Due to the instability of new energy, it has brought challenges to power supply and security.

[0003] The solid alkali process uses molten salt as the heat transfer medium and a coal-fired furnace as the heat source. The work capacity of energy is not utilized, and the pollution emission source is increased. Environmental protection facilities need to be set up to meet environmental protection requirements, which increases the operating costs of enterprises. Existing molten salt heating devices usually use a coupling process to avoid energy loss and increase operating costs. When heating molten salt, the molten salt inside is in a stacked state, and the heat transfer takes a certain amount of time. The coupling heating mechanism can quickly complete the heating of the molten salt at the joint of the inner wall of the box. The molten salt away from the coupling heating mechanism has low heating efficiency, which causes the temperature stratification of the molten salt inside the box, reducing the use value of the molten salt heating device. Summary of the invention

[0004] The present invention discloses a flexible heating and control system for molten salt heating in a thermal power generation system coupled with solid alkali production, aiming to solve the problem that the existing molten salt heating device usually adopts a coupling process to avoid energy loss and increase operating costs. When the molten salt is heated, the molten salt inside is in a stacked state, and the heat transfer requires a certain amount of time. The coupled heating mechanism can quickly complete the heating of the molten salt at the joint of the inner wall of the box, and the heating efficiency of the molten salt far away from the coupled heating mechanism is low, which leads to the technical problem of temperature stratification of the molten salt inside the box.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The thermal power generation system is coupled with solid alkali production molten salt heating flexible heating and control system, including a boiler, a steam turbine body, a generator, a control system group, a molten salt heating device, a temperature reduction and pressure reduction device 1 and a temperature reduction and pressure reduction device 2. An electric shut-off valve 1, an electric regulating valve and an electric shut-off valve 2 are installed between the boiler and the molten salt heating device in sequence, and an electric shut-off valve 6 and an electric shut-off valve 7 are installed between the molten salt heating device and the control system group. An electric shut-off valve 4 is provided on the temperature reduction and pressure reduction device 1, and one end of the electric shut-off valve 4 is provided with a steam turbine medium and low pressure A connecting pipe is provided, and electric shut-off valve three and electric shut-off valve five are installed between temperature reducing and pressure reducing device one and temperature reducing and pressure reducing device two, a flow meter one is installed on the molten salt heating device, one end of the flow meter one is installed between electric shut-off valve three and electric shut-off valve five, one end of the temperature reducing and pressure reducing device is installed with flow meter two, the molten salt heating device comprises a heating box, and a base is fixedly connected to the bottom of the heating box, a heating chamber is opened on the box body of the heating box, a coupling heating mechanism is fixedly connected to the interior of the heating chamber, and a circulating flow module is provided inside the heating box.

[0007] By providing a circulating flow module, when molten salt is heated, during the operation of the coupled heating mechanism, the liquid pump is started at regular intervals, and the liquid pump introduces the molten salt that is located between the partition ring plate and the inner wall of the heating box and has been heated into the upper part of the intermediate circulation cover through various through-branch pipes. As this part of the molten salt is extracted, the heated molten salt located in the upper layer of the intermediate circulation cover squeezes the unheated molten salt below, so that the blocking plate is expanded, and the unheated molten salt gradually enters between the partition ring plate and the inner wall of the heating box along the channel between the matching limit ring plate and the partition ring plate, starting a new round of molten salt heating, thereby realizing the circulating heating of the molten salt inside the heating box, improving the heating efficiency, and ensuring that the molten salt inside the heating box is completely heated.

[0008] In a preferred embodiment, the circulating flow module includes a partition ring plate, and the partition ring plate is fixedly connected to the bottom inner wall of the heating box. There is a certain gap between the partition ring plate and the inner wall of the heating box. An intermediate circulation cover is fixedly connected to the bottom inner wall of the heating box at the middle position, and a matching limiting ring plate is fixedly connected to the upward inclined surface of the intermediate circulation cover.

[0009] In a preferred solution, the outer side wall of the matching limiting ring plate facing the partition ring plate is fixedly connected with an extrusion arc plate, and the tops of the extrusion arc plate and the matching limiting ring plate are fixedly connected with the same sealing plate, and the top of the intermediate circulation cover is fixedly connected with a liquid extraction pump, and the extraction end of the liquid extraction pump is connected to the interior of the intermediate circulation cover through a pipeline.

[0010] In a preferred solution, the inner wall of the heating box located above the partition ring plate is fixedly connected with an annular connecting pipe, and the annular connecting pipe is provided with connecting holes in a bottom ring facing between the partition ring plate and the heating box, and a through branch pipe is fixedly connected to the interior of each connecting hole, and two alignment holes are provided on the annular connecting pipe, and the interiors of the two alignment holes are fixedly connected with the same alignment through pipe, and the liquid extraction end of the liquid extraction pump is fixedly connected with the liquid extraction pipe, and one end of the liquid extraction pipe is inserted into the interior of the alignment through pipe.

[0011] In a preferred solution, the outer wall of the intermediate circulation cover near the bottom end is provided with mounting holes at equal distances, and a discharge frame is fixedly connected to the inside of each mounting hole, and the top inner wall and the bottom inner wall of each discharge frame are connected to sealing plates by hinges, and the two sealing plates on the same discharge frame are in contact with each other, and an extrusion spring rod is fixedly connected to one side of the sealing plate at equal distances, and one end of the extrusion spring rod is fixedly connected to the inner wall of the discharge frame, and the side walls of the discharge frame located between the sealing plate and the intermediate circulation cover are fixedly connected with a clamping rod, and the clamping rod is in contact with the sealing plate, and an outflow hole is provided on the side of the discharge frame facing the partition ring plate, and a flow pipe is fixedly connected to the inside of the outflow hole.

[0012] In a preferred embodiment, a feeding hole is provided on the top of the heating box, and a feeding frame is fixedly connected to the inside of the feeding hole, two branch holes are provided on the top of the feeding frame, and feeding pipes are fixedly connected to the inside of the two branch holes, and pipe covers are screwed on the tops of the two feeding pipes, one of the feeding pipes is used for adding molten salt, and the other feeding pipe is used for passing steam.

[0013] In a preferred solution, a collecting hole is opened at the bottom of the heating box below the intermediate circulation cover, and a collecting pipe is fixedly connected to the inside of the collecting hole, and a pipe valve is connected to the outer wall of the collecting pipe through a flange.

[0014] In a preferred embodiment, two fixing holes are provided on the top of the heating box, and a gas-liquid separation module is provided inside the two fixing holes. The gas-liquid separation module includes an external sleeve, which is fixedly connected to the inside of the fixing hole. The external sleeve is located on the outer wall of the heating box and is fixedly connected to a mounting frame. The bottom of the mounting frame is fixedly connected to an exhaust arc hood, and exhaust holes are equidistantly provided at the bottom of the exhaust arc hood.

[0015] By providing a gas-liquid separation module, after the heat exchange between the reheated steam and the molten salt inside the heating box is completed, the extraction pump is started, and the extraction pump introduces the reheated steam carrying the molten salt into the filtrate cylinder. At the same time, the driving motor is started, and the driving motor drives the filtrate cylinder to rotate at a high speed, so as to separate the molten salt carried by the reheated steam. The reheated steam enters the collection ring frame and is led out through the docking air pipe. After the reheated steam is led out, the one-way valve is opened, and the molten salt in the filtrate cylinder is re-introduced into the heating box, so as to reduce the loss of molten salt and prevent the reheated steam from being contaminated and affecting its subsequent use value.

[0016] In a preferred embodiment, the outer wall of the external sleeve near the top is fixedly connected to a motor frame, and a driving motor is fixedly connected to the motor frame, the output shaft of the driving motor is fixedly connected to the driving shaft through a coupling, the bottom of the driving shaft is fixedly connected to a filtrate cartridge, the outer wall of the filtrate cartridge at the bottom is fitted with the inner wall of the external sleeve, the inner wall of the external sleeve is fixedly connected to a limiting ring rail, the inner sliding connection of the limiting ring rail is an annular slide rod, and the annular slide rod is fixedly connected to the outer wall of the filtrate cartridge.

[0017] In a preferred embodiment, the outer wall of the external sleeve located below the annular sliding rod is provided with an air outlet hole, and the external sleeve is fixedly connected to a collecting ring frame at the periphery of the air outlet hole, a docking air hole is provided on the top of the collecting ring frame, and a docking air pipe is fixedly connected to the inside of the docking air hole, the inner wall of the external sleeve located below the filtrate cylinder is fixedly connected to a flow guide cover, a derivation hole is provided at the bottom of the flow guide cover, and a derivation pipe is fixedly connected to the inside of the derivation hole, and a one-way valve is connected to the outer wall of the derivation pipe through a flange, and the one-way valve points from the inside of the external sleeve to the inside of the heating box, a pump ring frame is fixedly connected to the outer wall of the mounting frame facing downward, and an extraction pump is fixedly connected to the inside of the pump ring frame, the extraction end of the extraction pump is connected to the inside of the exhaust arc cover through a pipeline, and the delivery end of the extraction pump is connected to the inside of the flow guide cover through a pipeline.

[0018] From the above, it can be seen that the thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system provided by the present invention has the characteristics of starting the liquid pump at regular intervals during the operation of the coupled heating mechanism when heating the molten salt. The liquid pump introduces the molten salt that is located between the partition ring plate and the inner wall of the heating box and has been heated into the upper part of the intermediate circulation cover through each through branch pipe. As this part of the molten salt is extracted, the heated molten salt located in the upper layer of the intermediate circulation cover squeezes the unheated molten salt below, so that the sealing plate is expanded, and the unheated molten salt gradually enters between the partition ring plate and the inner wall of the heating box along the channel between the matching limit ring plate and the partition ring plate, starting a new round of molten salt heating, thereby realizing the molten salt circulation heating inside the heating box, improving the heating efficiency, and ensuring that the molten salt inside the heating box is completely heated. Technical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a process flow chart of the flexible heating and control system for the thermal power generation system coupled with solid alkali production molten salt heating proposed by the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the molten salt heating device proposed in the present invention, which is a flexible heating and control system for molten salt heating in the thermal power generation system coupled with solid alkali production.

[0021] Figure 3This is a cross-sectional view of the heating box structure of the thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system proposed by the present invention.

[0022] Figure 4 This is a schematic diagram of the circulating flow module of the thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system proposed in the present invention.

[0023] Figure 5 for Figure 4 The overall structural cross-sectional view.

[0024] Figure 6 This is a cross-sectional view of the discharge frame and flow pipe structure of the thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system proposed by the present invention.

[0025] Figure 7 This is a schematic diagram of the gas-liquid separation module of the thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system proposed in the present invention.

[0026] Figure 8 for Figure 7 A cross-sectional view of the local structure.

[0027] Fig. 9 for Figure 8 Schematic diagram of the plan structure.

[0028] In the figure: 1. Boiler; 2. Steam turbine body; 3. Generator; 4. Control system group; 5. Molten salt heating device; 501. Heating box; 502. Base; 503. Heating chamber; 504. Coupled heating mechanism; 6. Electric shut-off valve 1; 7. Electric regulating valve; 8. Electric shut-off valve 2; 9. Electric shut-off valve 3; 10. Temperature and pressure reduction device 1; 11. Electric shut-off valve 4; 12. Electric shut-off valve 5; 13. Temperature and pressure reduction device 2; 14, electric shut-off valve 6; 15, electric shut-off valve 7; 16, flow meter 1; 17, flow meter 2; 18, medium and low pressure connecting pipe of steam turbine; 19, gas-liquid separation module; 1901, external sleeve; 1902, docking air pipe; 1903, exhaust arc cover; 1904, mounting frame; 1905, extraction pump; 1906, drive shaft; 1907, drive motor; 1908, motor frame ; 1909, filtrate cartridge; 1910, collection ring frame; 1911, pump ring frame; 1912, outlet pipe; 1913, one-way valve; 1914, flow guide cover; 1915, air outlet; 1916, annular slide bar; 1917, limit ring rail; 1918, air extraction hole; 20, feeding frame; 21, feeding pipe; 22, pipe cover; 23, circulation flow module; 2301, partition ring plate; 2302, annular connection Through pipe; 2303, flow pipe; 2304, intermediate circulation cover; 2305, discharge frame; 2306, sealing plate; 2307, through branch pipe; 2308, matching limit ring plate; 2309, liquid extraction pump; 2310, extrusion arc plate; 2311, sealing plate; 2312, liquid extraction pipe; 2313, alignment through pipe; 2314, extrusion spring rod; 2315, clamping rod; 24, collecting pipe; 25, pipe valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] The thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system disclosed in the present invention is mainly applied to the existing molten salt heating device which usually adopts a coupling process to avoid the problems of energy loss and increased operating costs. When the molten salt is heated, the molten salt inside is in a stacked state, and the heat transfer requires a certain amount of time. The coupled heating mechanism can quickly complete the heating of the molten salt at the joint of the inner wall of the box. The heating efficiency of the molten salt far away from the coupled heating mechanism is low, which causes the molten salt inside the box to have temperature stratification.

[0031] Reference Figure 1-Figure 9The thermal power generation system is coupled with the solid alkali production molten salt heating flexible heating and control system, including a boiler 1, a turbine body 2, a generator 3, a control system group 4, a molten salt heating device 5, a temperature reduction and pressure reduction device 10 and a temperature reduction and pressure reduction device 2 13, an electric shut-off valve 1 6, an electric regulating valve 7 and an electric shut-off valve 2 8 are installed between the boiler 1 and the molten salt heating device 5 in sequence, and an electric shut-off valve 6 14 and an electric shut-off valve 7 15 are installed between the molten salt heating device 5 and the control system group 4, an electric shut-off valve 4 11 is provided on the temperature reduction and pressure reduction device 10, and one end of the electric shut-off valve 4 11 is provided with a turbine medium and low pressure connecting pipe 18, and the temperature reduction and pressure reduction device 10 is provided with a steam ... An electric shut-off valve 3 9 and an electric shut-off valve 5 12 are installed between the temperature reducing and pressure reducing device 10 and the temperature reducing and pressure reducing device 2 13, a flow meter 16 is installed on the molten salt heating device 5, one end of the flow meter 16 is installed between the electric shut-off valve 3 9 and the electric shut-off valve 5 12, a flow meter 2 17 is installed at one end of the temperature reducing and pressure reducing device, the molten salt heating device 5 comprises a heating box 501, and a base 502 is fixedly connected to the bottom of the heating box 501, a heating chamber 503 is opened on the box body of the heating box 501, a coupling heating mechanism 504 is fixedly connected to the interior of the heating chamber 503, and a circulating flow module 23 is arranged inside the heating box 501.

[0032] Reference Figure 1-Figure 6In a preferred embodiment, the circulation flow module 23 includes a partition ring plate 2301, and the partition ring plate 2301 is fixedly connected to the bottom inner wall of the heating box 501, and there is a certain gap between the partition ring plate 2301 and the inner side wall of the heating box 501, and the bottom inner wall of the heating box 501 at the middle position is fixedly connected to an intermediate circulation cover 2304, and a matching limiting ring plate 2308 is fixedly connected to the upper inclined surface of the intermediate circulation cover 2304, and an extrusion arc plate 231 is fixedly connected to the outer side wall of the matching limiting ring plate 2308 facing the partition ring plate 2301 0, and the top of the extrusion arc plate 2310 and the matching limiting ring plate 2308 are fixedly connected with the same sealing plate 2311, the top of the intermediate circulation cover 2304 is fixedly connected with a liquid pump 2309, and the extraction end of the liquid pump 2309 is connected to the inside of the intermediate circulation cover 2304 through a pipeline, and the inner side wall of the heating box 501 located above the partition ring plate 2301 is fixedly connected with an annular connecting pipe 2302, and the annular connecting pipe 2302 faces the bottom ring between the partition ring plate 2301 and the heating box 501. A connecting hole is opened in an annular manner, and the inside of each connecting hole is fixedly connected with The branch pipe 2307 is penetrated, and two alignment holes are formed on the annular connecting pipe 2302. The interior of the two alignment holes is fixedly connected with the same alignment through pipe 2313. The liquid extraction end of the liquid extraction pump 2309 is fixedly connected with the liquid extraction pipe 2312. One end of the liquid extraction pipe 2312 is plugged into the interior of the alignment through pipe 2313. The outer wall of the intermediate circulation cover 2304 near the bottom end is provided with mounting holes at equal distances, and the interior of each mounting hole is fixedly connected with a discharge frame 2305. The top inner wall and the bottom inner wall of each discharge frame 2305 are connected with a blocking plate 2306 through a hinge, and are located at the same The two sealing plates 2306 on each discharge frame 2305 are in contact with each other, and an extrusion spring rod 2314 is fixedly connected to one side of the sealing plate 2306 at an equal distance, and one end of the extrusion spring rod 2314 is fixedly connected to the inner wall of the discharge frame 2305, and the side walls of the discharge frame 2305 located between the sealing plate 2306 and the intermediate circulation cover 2304 are fixedly connected with a clamping rod 2315, and the clamping rod 2315 is in contact with the sealing plate 2306, and an outflow hole is opened on the side of the discharge frame 2305 facing the partition ring plate 2301, and the inside of the outflow hole is fixedly connected with a flow pipe 2303.

[0033] In a specific application scenario, when molten salt is being heated, during the operation of the coupled heating mechanism 504, the liquid pump 2309 is started at regular intervals, and the liquid pump 2309 introduces the molten salt that has been heated and is located between the partition ring plate 2301 and the inner wall of the heating box 501 into the top of the intermediate circulation cover 2304 through each through branch pipe 2307. As this part of the molten salt is extracted, the heated molten salt located in the upper layer of the intermediate circulation cover 2304 squeezes the unheated molten salt below, causing the sealing plate 2306 to expand, and the unheated molten salt gradually enters between the partition ring plate 2301 and the inner wall of the heating box 501 along the channel between the limiting ring plate 2308 and the partition ring plate 2301, starting a new round of molten salt heating, thereby realizing the molten salt circulation heating inside the heating box 501, improving the heating efficiency, and ensuring that the molten salt inside the heating box 501 is completely heated.

[0034] Reference Figure 2 and Figure 3 In a preferred embodiment, a feeding hole is provided on the top of the heating box 501, and a feeding frame 20 is fixedly connected to the inside of the feeding hole, two branch holes are provided on the top of the feeding frame 20, and a feeding pipe 21 is fixedly connected to the inside of the two branch holes, and a pipe cover 22 is screwed on the top of the two feeding pipes 21, one of the feeding pipes 21 is used to add molten salt, and the other feeding pipe 21 is used to pass steam, and a collecting hole is provided at the bottom of the heating box 501 located below the intermediate circulation cover 2304, and a collecting pipe 24 is fixedly connected to the inside of the collecting hole, and the outer wall of the collecting pipe 24 is connected to a pipe valve 25 through a flange.

[0035] Reference Figure 1 , Figure 2 , Figure 7 , Figure 8 and Fig. 9In a preferred embodiment, two fixing holes are formed on the top of the heating box 501, and gas-liquid separation modules 19 are provided inside the two fixing holes. The gas-liquid separation module 19 comprises an external sleeve 1901, which is fixedly connected to the inside of the fixing hole. The external sleeve 1901 is located on the outer wall of the heating box 501 and is fixedly connected to a mounting frame 1904. The bottom of the mounting frame 1904 is fixedly connected to an exhaust arc cover 1903. The bottom of the exhaust arc cover 1903 is provided with exhaust holes 1918 at equal distances. The external sleeve 1901 is close to the outer wall of the heating box 501. The outer wall of the top is fixedly connected to a motor frame 1908, and the motor frame 1908 is fixedly connected to a driving motor 1907, the output shaft of the driving motor 1907 is fixedly connected to a driving shaft 1906 through a coupling, and the bottom of the driving shaft 1906 is fixedly connected to a filtrate cartridge 1909, the outer wall of the filtrate cartridge 1909 at the bottom is fitted with the inner wall of the external sleeve 1901, and the inner wall of the external sleeve 1901 is fixedly connected to a limiting ring rail 1917, and the inner side of the limiting ring rail 1917 is slidably connected to a ring slide bar 1916, and the ring slide bar 19 16 is fixedly connected to the outer wall of the filtrate cartridge 1909, the outer wall of the external sleeve 1901 located below the annular slide bar 1916 is provided with an air outlet 1915, and the external sleeve 1901 is fixedly connected to a collection ring frame 1910 at the periphery of the air outlet 1915, the top of the collection ring frame 1910 is provided with a docking air hole, the inside of the docking air hole is fixedly connected with a docking air pipe 1902, the inner wall of the external sleeve 1901 located below the filtrate cartridge 1909 is fixedly connected with a guide cover 1914, the bottom of the guide cover 1914 is provided with a lead-out hole, and the lead-out hole is provided with a guide cover 1914. An outlet pipe 1912 is fixedly connected inside, and a one-way valve 1913 is connected to the outer wall of the outlet pipe 1912 through a flange. The one-way valve 1913 points from the inside of the external sleeve 1901 to the inside of the heating box 501. A pump ring frame 1911 is fixedly connected to the outer wall of the mounting frame 1904 facing downward, and an extraction pump 1905 is fixedly connected to the inside of the pump ring frame 1911. The extraction end of the extraction pump 1905 is connected to the inside of the exhaust arc hood 1903 through a pipeline, and the delivery end of the extraction pump 1905 is connected to the inside of the guide hood 1914 through a pipeline.

[0036] Specifically, after the heat exchange between the reheated steam and the molten salt inside the heating box 501 is completed, the extraction pump 1905 is started, and the extraction pump 1905 introduces the reheated steam carrying the molten salt into the filtrate cylinder 1909. At the same time, the drive motor 1907 is started, and the drive motor 1907 drives the filtrate cylinder 1909 to rotate at a high speed, thereby separating the molten salt carried by the reheated steam. The reheated steam enters the collection ring frame 1910 and is discharged through the docking air pipe 1902. After the reheated steam is discharged, the one-way valve 1913 is opened, and the molten salt in the filtrate cylinder 1909 is re-introduced into the heating box 501, thereby reducing the loss of molten salt and preventing the reheated steam from being contaminated and affecting its subsequent use value.

[0037] The process flow of the flexible heating and control system of the thermal power generation system coupled with molten salt heating in solid alkali production includes the following steps:

[0038] Step 1: 538°C reheated steam enters the molten salt heating device 5 through the electric shut-off valve 1 6, the electric regulating valve 7, and the electric shut-off valve 2 8 in sequence, and is cooled to 440°C after heat exchange with the molten salt;

[0039] Step 2: The reheated steam after heat exchange passes through flow meter 1 16, electric shut-off valve 3 9, and is adjusted to the unit connecting pipe parameter (350°C) through temperature reduction and pressure reduction device 1 10 and temperature reduction and pressure reduction device 2 13;

[0040] Step 3: The adjusted reheated steam is incorporated into the unit through the electric shut-off valve 4 11 and enters the low-pressure cylinder of the turbine body 2 to continue to do work.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thermal power generation system coupled with solid alkali production molten salt heating flexible heat supply and control system, comprising a boiler (1), a steam turbine body (2), a generator (3), a control system group (4), a molten salt heating device (5), a first temperature reduction and pressure reduction device (10) and a second temperature reduction and pressure reduction device (13), characterized in that: An electric shut-off valve 1 (6), an electric regulating valve (7) and an electric shut-off valve 2 (8) are sequentially installed between the boiler (1) and the molten salt heating device (5), and an electric shut-off valve 6 (14) and an electric shut-off valve 7 (15) are installed between the molten salt heating device (5) and the control system group (4). An electric shut-off valve 4 (11) is installed on the temperature-reducing and pressure-reducing device 1 (10), and a steam turbine medium- and low-pressure connecting pipe (18) is installed at one end of the electric shut-off valve 4 (11). An electric shut-off valve 3 (9) and an electric shut-off valve 5 (12) are installed between the temperature-reducing and pressure-reducing device 1 (10) and the temperature-reducing and pressure-reducing device 2 (13). A flow meter 1 (16) is installed on the molten salt heating device (5), one end of the flow meter 1 (16) is installed between the electric shut-off valve 3 (9) and the electric shut-off valve 5 (12), one end of the temperature reduction and pressure reduction device is installed with a flow meter 2 (17), the molten salt heating device (5) comprises a heating box (501), and the bottom of the heating box (501) is fixedly connected to a base (502), a heating chamber (503) is opened on the box body of the heating box (501), the interior of the heating chamber (503) is fixedly connected to a coupling heating mechanism (504), and a circulating flow module (23) is provided inside the heating box (501).

2. The flexible heating and control system for molten salt heating for coupled thermal power generation system in solid alkali production according to claim 1 is characterized in that: The circulating flow module (23) includes a partition ring plate (2301), and the partition ring plate (2301) is fixedly connected to the bottom inner wall of the heating box (501), and there is a certain gap between the partition ring plate (2301) and the inner wall of the heating box (501), and an intermediate circulation cover (2304) is fixedly connected to the bottom inner wall of the heating box (501) at the middle position, and a matching limiting ring plate (2308) is fixedly connected to the upward inclined surface of the intermediate circulation cover (2304).

3. The flexible heating and control system for molten salt heating for coupled solid alkali production by thermal power generation system according to claim 2 is characterized in that: The outer side wall of the matching limiting ring plate (2308) facing the partition ring plate (2301) is fixedly connected with an extrusion arc plate (2310), and the tops of the extrusion arc plate (2310) and the matching limiting ring plate (2308) are fixedly connected with a same sealing plate (2311), and the top of the intermediate circulation cover (2304) is fixedly connected with a liquid extraction pump (2309), and the extraction end of the liquid extraction pump (2309) is connected to the inside of the intermediate circulation cover (2304) through a pipeline.

4. The flexible heating and control system for molten salt heating for thermal power generation system coupled with solid alkali production according to claim 3 is characterized in that: The inner wall of the heating box (501) located above the partition ring plate (2301) is fixedly connected to an annular connecting pipe (2302), and the annular connecting pipe (2302) is provided with a connecting hole in a ring shape at the bottom facing between the partition ring plate (2301) and the heating box (501), and a through branch pipe (2307) is fixedly connected to the inside of each connecting hole. Two alignment holes are provided on the annular connecting pipe (2302), and the insides of the two alignment holes are fixedly connected to the same alignment through pipe (2313), and the liquid extraction end of the liquid extraction pump (2309) is fixedly connected to the liquid extraction pipe (2312), and one end of the liquid extraction pipe (2312) is inserted into the inside of the alignment through pipe (2313).

5. The flexible heating and control system for molten salt heating for coupled solid alkali production by thermal power generation system according to claim 4 is characterized in that: The outer wall of the intermediate circulation cover (2304) near the bottom end is provided with mounting holes at equal distances, and a discharge frame (2305) is fixedly connected to the inside of each mounting hole, and a blocking plate (2306) is connected to the top inner wall and the bottom inner wall of each discharge frame (2305) via a hinge, and the two blocking plates (2306) located on the same discharge frame (2305) are in contact with each other, and an extrusion spring rod (2314) is fixedly connected to one side of the blocking plate (2306) at equal distances. One end of the extrusion spring rod (2314) is fixedly connected to the inner wall of the discharge frame (2305), and the side walls of the discharge frame (2305) located between the sealing plate (2306) and the intermediate circulation cover (2304) are fixedly connected with a clamping rod (2315), and the clamping rod (2315) is in contact with the sealing plate (2306). An outflow hole is opened on the side of the discharge frame (2305) facing the partition ring plate (2301), and a flow pipe (2303) is fixedly connected inside the outflow hole.

6. The flexible heating and control system for molten salt heating for thermal power generation system coupled with solid alkali production according to claim 1 is characterized in that: The heating box (501) has a feeding hole at the top, and a feeding frame (20) is fixedly connected to the inside of the feeding hole. The feeding frame (20) has two branch holes at the top, and feeding pipes (21) are fixedly connected to the inside of the two branch holes. The tops of the two feeding pipes (21) are screwed with pipe covers (22), one of the feeding pipes (21) is used to add molten salt, and the other feeding pipe (21) is used to pass steam.

7. The flexible heating and control system for molten salt heating for thermal power generation system coupled with solid alkali production according to claim 2 is characterized in that: The bottom of the heating box (501) located below the intermediate circulation cover (2304) is provided with a collecting hole, and the inside of the collecting hole is fixedly connected to a collecting pipe (24), and the outer wall of the collecting pipe (24) is connected to a pipe valve (25) via a flange.

8. The flexible heating and control system for molten salt heating for thermal power generation system coupled with solid alkali production according to claim 1 is characterized in that: The heating box (501) has two fixing holes on the top, and the two fixing holes are each provided with a gas-liquid separation module (19), the gas-liquid separation module (19) comprising an external sleeve (1901), the external sleeve (1901) being fixedly connected to the inside of the fixing hole, the external sleeve (1901) being located on the outer wall inside the heating box (501) and being fixedly connected to a mounting frame (1904), the bottom of the mounting frame (1904) being fixedly connected to an exhaust arc hood (1903), and exhaust holes (1918) being equidistantly provided at the bottom of the exhaust arc hood (1903).

9. The thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system according to claim 8 is characterized in that: The outer wall of the external sleeve (1901) close to the top is fixedly connected to a motor frame (1908), and the motor frame (1908) is fixedly connected to a driving motor (1907), the output shaft of the driving motor (1907) is fixedly connected to a driving shaft (1906) via a coupling, the bottom of the driving shaft (1906) is fixedly connected to a filtrate cartridge (1909), the outer wall of the filtrate cartridge (1909) at the bottom is in contact with the inner wall of the external sleeve (1901), the inner wall of the external sleeve (1901) is fixedly connected to a limiting ring rail (1917), the inner part of the limiting ring rail (1917) is slidably connected to an annular slide bar (1916), and the annular slide bar (1916) is fixedly connected to the outer wall of the filtrate cartridge (1909).

10. The thermal power generation system coupled with solid alkali production molten salt heating flexible heating and control system according to claim 9 is characterized in that: The outer wall of the external sleeve (1901) located below the annular slide bar (1916) is provided with an air outlet hole (1915), and the external sleeve (1901) is fixedly connected to a collection ring frame (1910) located outside the air outlet hole (1915), a docking air hole is provided on the top of the collection ring frame (1910), and a docking air pipe (1902) is fixedly connected to the inside of the docking air hole, and a flow guide cover (1914) is fixedly connected to the inner wall of the external sleeve (1901) located below the filtrate cartridge (1909), and a deflection hole is provided at the bottom of the deflection cover (1914), and a deflection pipe (1902) is fixedly connected to the inside of the deflection hole. 1912), the outer wall of the outlet pipe (1912) is connected to a one-way valve (1913) through a flange, the one-way valve (1913) points from the inside of the external sleeve (1901) to the inside of the heating box (501), the outer wall of the mounting frame (1904) facing downward is fixedly connected to a pump ring frame (1911), the inside of the pump ring frame (1911) is fixedly connected to an extraction pump (1905), the extraction end of the extraction pump (1905) is connected to the inside of the exhaust arc hood (1903) through a pipeline, and the delivery end of the extraction pump (1905) is connected to the inside of the guide hood (1914) through a pipeline.

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