Molten salt coupling gas power generation system capable of being flexibly adjusted

Abstract

The invention provides a fused salt coupling gas power generation system capable of being flexibly adjusted, and relates to the field of gas power generation. The fused salt coupling coal gas power generation system capable of being flexibly adjusted comprises a thermoelectric system and a heat storage and release system which are coupled with each other, the heat storage and release system further comprises a plurality of adjusting branches and a plurality of water supply valves, and the water supply valves are arranged on the adjusting branches in a one-to-one correspondence mode; each adjusting branch extends from the water supply pipeline to the steam generation pipeline; opening and closing of each water supply valve are used for controlling water entering the steam generation pipeline to be heated by a preset number of heaters. According to the system, through the configuration of the multiple adjusting branches and the water feeding valves, the system can dynamically adjust the number of heaters through which water entering the steam generation pipeline flows by adjusting the opening and closing states of all the water feeding valves according to the actual operation requirement and the coal gas fluctuation condition; by means of the process, the feed water temperature can be controlled and stabilized within the preset temperature range.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal gas power generation, and in particular relates to a flexibly adjustable molten salt coupled coal gas power generation system. Background Art

[0002] The steel industry is energy-intensive and carbon-intensive. Applying energy storage technology to build a smart, clean energy network can optimize energy usage, achieve precise spatial and temporal alignment, and promote energy conservation and efficiency. Steel production generates a large amount of low-calorific-value gas. Besides self-use, excess gas is primarily burned in boilers to generate electricity. Gas-fired power generation is affected by the production cycle, making it difficult to adapt to real-time fluctuations in electricity load and peak and valley electricity prices in the power market. Molten salt energy storage can be coupled with gas-fired generators and embedded in the thermal network. This multi-energy system, called "gas-molten salt-steam-electricity," achieves multi-energy synergy, improving gas utilization and power plant operational flexibility, optimizing energy costs, and ensuring stable energy use.

[0003] In a molten salt heat storage and release system, when the system releases heat, the steam generation pipeline absorbs heat from the molten salt circulation pipeline, converting water into steam for power generation. The feed water to the steam generation pipeline is usually preheated by steam from the cylinder.

[0004] However, in the prior art, the steam temperature in the cylinder may fluctuate due to factors such as gas fluctuations, which makes it difficult for the feed water temperature of the steam generating pipeline to be stabilized within an ideal temperature range. Summary of the Invention

[0005] In view of this, the present invention provides a flexibly adjustable molten salt coupled coal gas power generation system, aiming to improve the stability of the feed water temperature of the steam generation pipeline.

[0006] The technical solution of the present invention is achieved as follows:

[0007] The embodiment of the present invention provides a flexibly adjustable molten salt coupled coal gas power generation system, comprising: a thermoelectric system, comprising a boiler, a first steam pipeline, a water supply pipeline and a cylinder, wherein the water supply pipeline is connected between the cylinder and the boiler; the boiler is arranged between the first steam pipeline and the water supply pipeline, so that the water transported by the water supply pipeline is converted into steam after being heated and is transported to the cylinder through the first steam pipeline to generate electricity; a heat storage and release system, comprising a molten salt furnace, a molten salt circulation pipeline, a steam generation pipeline and a molten salt heat exchanger group, the molten salt furnace is arranged on the molten salt circulation pipeline, so that the low-temperature molten salt in the molten salt circulation pipeline is converted into high-temperature molten salt and stores energy after absorbing the heat in the molten salt furnace; the molten salt heat exchanger group is arranged on the heat release pipe section of the molten salt circulation pipeline; the steam generation pipeline is connected to the water supply pipeline and the first steam pipeline respectively; and the steam generation pipeline passes through the heat exchanger group to absorb the molten salt The heat of the heat release section of the circulation pipeline is converted into steam by the water in the steam generating pipeline and enters the cylinder to generate electricity, while the high-temperature molten salt is converted into the low-temperature molten salt; wherein the thermoelectric system further comprises a plurality of heaters and a plurality of heating branches, and each of the heaters is arranged at intervals on the water supply pipeline; each of the heating branches extends from the outlet of the cylinder, and extends one-to-one to the inlet of each of the heaters, so as to heat the water in the water supply pipeline respectively; the heat storage and release system further comprises a plurality of regulating branches and a plurality of water supply valves, and each of the water supply valves is arranged one-to-one on each of the regulating branches; each of the regulating branches extends from the pipe section between two adjacent heaters of the water supply pipeline and / or the pipe section between the heater and the boiler to the steam generating pipeline; the opening and closing of each of the water supply valves is used to control the water entering the steam generating pipeline to be heated by a predetermined number of the heaters.

[0008] In one embodiment, the cylinder includes a high-pressure cylinder and a medium- and low-pressure cylinder, and the first steam pipeline includes a main steam pipeline and a reheat steam pipeline; one end of the main steam pipeline is connected to the steam outlet of the boiler, and the other end is connected to the inlet of the high-pressure cylinder; one end of the reheat steam pipeline is connected to the outlet of the high-pressure cylinder, and the other end is connected to the inlet of the medium- and low-pressure cylinders, and passes through the boiler; one end of the feed water pipeline is connected to the outlet of the medium- and low-pressure cylinders, and the other end is connected to the feed water port of the boiler; the multiple heaters include several high-pressure heaters and several low-pressure heaters, and the high-pressure heater is larger than the The low-pressure heater is closer to the boiler; the multiple heating branches include several high-pressure heating branches and several low-pressure heating branches, each of the high-pressure heating branches extends from the outlet of the high-pressure cylinder and extends one-to-one to the inlet of each of the high-pressure heaters, and each of the low-pressure heating branches extends from the outlet of the medium and low-pressure cylinders and extends one-to-one to the inlet of each of the low-pressure heaters; wherein, each of the regulating branches extends to the steam generating pipeline from the pipe section between two adjacent high-pressure heaters of the water supply pipeline and / or the pipe section between the high-pressure heater and the boiler.

[0009] In one embodiment, the multiple high-pressure heaters include a first high-pressure heater and a second high-pressure heater that are adjacently arranged, and the first high-pressure heater is closer to the boiler than the second high-pressure heater; the multiple regulating branches include a first regulating branch and a second regulating branch, the first regulating branch extends from the pipe section between the first high-pressure heater and the boiler of the feed water pipeline to the steam generating pipeline, and the second regulating branch extends from the pipe section between the first high-pressure heater and the second high-pressure heater of the feed water pipeline to the steam generating pipeline; the multiple feed water valves include a first feed water valve and a second feed water valve, the first feed water valve is arranged on the first regulating branch, and the second feed water valve is arranged on the second regulating branch; wherein, one of the first feed water valve and the second feed water valve is open and the other is closed.

[0010] In one embodiment, a deaerator is provided in the water supply pipeline between the adjacent high-pressure heater and the low-pressure heater; a first connecting pipe is provided between two adjacent high-pressure heaters and between the adjacent high-pressure heater and the deaerator.

[0011] In one embodiment, a condenser is provided in the water supply pipeline between the low-pressure heater and the intermediate and low-pressure cylinders; and a second connecting pipe is provided between two adjacent low-pressure heaters and between the adjacent low-pressure heaters and the intermediate and low-pressure cylinders.

[0012] In one embodiment, it also includes a high-pressure heater cut-off system, which includes a first water supply branch, a second water supply branch, a high-pressure heater cut-off preheating pipeline and a low-load preheater arranged on the high-pressure heater cut-off preheating pipeline; the first water supply branch is a pipe section between the adjacent high-pressure heater and the low-pressure heater, extending to the steam generating pipeline; the first water supply branch passes through the low-load preheater; the second water supply branch is a pipe section between the adjacent high-pressure heater and the low-pressure heater, extending to the water supply port of the boiler; the high-pressure heater cut-off preheating pipeline extends from the outlet of the high-pressure cylinder to the pipe section between the adjacent high-pressure heater and the low-pressure heater; wherein, a steam valve is provided on the high-pressure heater cut-off preheating pipeline to allow or prevent the steam in the high-pressure cylinder from entering the low-load preheater; the first water supply branch and the second water supply branch are provided with a cut-off valve at one end close to the water supply pipeline to allow or prevent the water in the water supply pipeline from entering the first water supply branch and the second water supply branch.

[0013] In one embodiment, a deaerator is provided in the water supply pipeline between the adjacent high-pressure heater and the low-pressure heater; wherein the high-pressure heater cut-off preheating pipeline extends from the outlet of the high-pressure cylinder to the inlet of the deaerator.

[0014] In one embodiment, the molten salt heat exchanger group includes a preheater, an evaporator, a steam drum and a superheater; the heat release pipe section of the molten salt circulation pipeline passes through the superheater, the evaporator and the preheater in sequence, and the heat absorption pipe section of the steam generation pipeline passes through the preheater, the steam drum and the superheater in sequence; wherein, an evaporation pipe is connected between the evaporator and the steam drum to introduce water in the steam drum into the evaporator to absorb heat and turn into steam, and the steam is introduced back into the steam drum.

[0015] In one embodiment, the heat storage and release system further includes a high-temperature molten salt tank, a low-temperature molten salt tank and a preheating furnace; along the extension direction of the molten salt circulation pipeline, the low-temperature molten salt tank, the preheating furnace, the molten salt furnace and the high-temperature molten salt tank are sequentially arranged on the molten salt circulation pipeline; wherein the exhaust pipe of the molten salt furnace and / or the boiler is connected to the preheating furnace to preheat the molten salt from the low-temperature molten salt tank.

[0016] In one embodiment, the heat storage and release system also includes a molten salt temperature regulating tank and a high-temperature molten salt branch. The molten salt temperature regulating tank is arranged between the preheating furnace and the molten salt furnace to allow the medium-temperature molten salt preheated by the preheating furnace to flow in; the high-temperature molten salt branch is a pipe section between the molten salt furnace and the high-temperature molten salt tank of the molten salt circulation pipeline, extending to the molten salt temperature regulating tank to allow part of the high-temperature molten salt heated by the molten salt furnace to flow in.

[0017] The embodiment of the present invention provides a flexibly adjustable molten salt coupled coal gas power generation system, which flexibly adjusts the molten salt coupled coal gas power generation system, comprising: a thermoelectric system, comprising a boiler, a first steam pipeline, a water supply pipeline and a cylinder, wherein the water supply pipeline is connected between the cylinder and the boiler; the boiler is arranged between the first steam pipeline and the water supply pipeline, so that the water transported by the water supply pipeline is converted into steam after being heated and is transported to the cylinder through the first steam pipeline to generate electricity; a heat storage and release system, comprising a molten salt furnace, a molten salt circulation pipeline, a steam generation pipeline and a molten salt heat exchanger group, the molten salt furnace is arranged on the molten salt circulation pipeline, so that the low-temperature molten salt in the molten salt circulation pipeline is converted into high-temperature molten salt and stores energy after absorbing the heat in the molten salt furnace; the molten salt heat exchanger group is arranged on the heat release pipe section of the molten salt circulation pipeline; the steam generation pipeline is connected to the water supply pipeline and the first steam pipeline respectively; and the steam generation pipeline passes through the heat exchanger The heat storage and release system further comprises a plurality of regulating branches and a plurality of water supply valves, each of which is provided on each regulating branch. Each regulating branch extends from the pipe section between two adjacent heaters of the water supply pipe and / or the pipe section between the heater and the boiler to the steam generation pipe. The opening and closing of each water supply valve is used to control the water entering the steam generation pipe to be heated by a predetermined number of heaters. The molten salt coupled coal gas power generation system provided by the present invention realizes efficient storage and flexible release of thermal energy through the coupling of the thermoelectric system and the heat storage and release system. At the same time, through the design of multiple heaters and heating branches, multi-stage preheating of the water in the water supply pipeline is achieved, and the steam heat in the cylinder is effectively utilized. More importantly, the present invention, with the help of the configuration of multiple regulating branches and water supply valves, enables the system to dynamically adjust the number of heaters through which the water entering the steam generation pipeline flows by adjusting the opening and closing states of each water supply valve according to actual operating requirements and gas fluctuation conditions. This process ensures that the water supply temperature can be controlled and stabilized within a preset temperature range. In this way, the present invention ensures that after the water in the steam generation pipeline absorbs heat, the molten salt in the molten salt circulation pipeline can be maintained within the ideal operating temperature range. This not only ensures the fluidity of the molten salt, but also avoids the problem of overheating of the molten salt, thereby improving the heat storage efficiency of the molten salt and the stability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the overall structure of an embodiment of a flexibly adjustable molten salt coupled coal gas power generation system provided by the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0021] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.

[0022] Description of reference numerals:

[0023] 1. Thermal power system; 11. Boiler; 12. First steam pipeline; 121. Main steam pipeline; 122. Reheat steam pipeline; 13. Feedwater pipeline; 14. Cylinder; 141. High-pressure cylinder; 142. Medium- and low-pressure cylinders; 15. Heater; 151. High-pressure heater; 1511. First high-pressure heater; 1512. Second high-pressure heater; 152. Low-pressure heater; 16. Heating branch; 161. High-pressure heating branch; 162. Low-pressure heating branch; 163. First connecting pipe; 164. Second connecting pipe; 17. Deaerator; 18. Condenser; 2. Heat storage and release system; 21. Molten salt furnace; 22. Molten salt circulation pipeline; 2 21. High-temperature molten salt branch; 23. Steam generating pipeline; 24. Regulating branch; 241. First regulating branch; 242. Second regulating branch; 25. Feedwater valve; 251. First feedwater valve; 252. Second feedwater valve; 26. High-temperature molten salt tank; 27. Low-temperature molten salt tank; 28. Preheating furnace; 29. Molten salt temperature regulating tank; 20. Molten salt heat exchanger group; 201. Preheater; 202. Evaporator; 203. Steam drum; 204. Superheater; 205. Evaporation tube; 3. High-pressure heater cut-off system; 31. First feedwater branch; 32. Second feedwater branch; 33. High-pressure heater cut-off preheating pipeline; 34. Low-load preheater; 35. Steam valve. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] In a molten salt heat storage and release system, when the system releases heat, the steam generation pipeline 23 absorbs heat from the molten salt circulation pipeline, thereby converting water into steam for power generation. The water supply to the steam generation pipeline 23 is usually preheated by the steam in the cylinder.

[0028] However, in the prior art, the temperature of the steam in the cylinder may fluctuate due to factors such as gas fluctuations, which makes it difficult for the feed water temperature of the steam generating pipeline 23 to be stabilized within an ideal temperature range.

[0029] Therefore, the present invention provides a flexibly adjustable molten salt coupled coal gas power generation system to improve the stability of the feed water temperature of the steam generation pipeline.

[0030] See also Figure 1The molten salt coupled coal gas power generation system includes a thermoelectric system 1 and a heat storage and release system 2. The thermoelectric system 1 is used to convert the heat energy generated by coal gas combustion into electrical energy; the heat storage and release system 2 is used to store the heat energy generated by coal gas combustion and selectively release it, and is coupled with the thermoelectric system 1 to improve the system's thermal energy utilization rate and operational flexibility.

[0031] Specifically, the thermal power system 1 includes a boiler 11, a first steam pipeline 12, a water supply pipeline 13 and a cylinder 14. The boiler 11 generates high-temperature flue gas by burning coal gas. These high-temperature flue gases exchange heat with water inside the boiler 11, converting the water into high-pressure and high-temperature steam. These steams are then introduced into the cylinder 14 through the first steam pipeline 12, driving the blades of the steam turbine unit to rotate, thereby driving the generator to generate electricity. The water supply pipeline 13 is connected between the cylinder 14 and the boiler 11; specifically, one end is connected to the outlet of the cylinder 14, and the other end is connected to the water supply port of the boiler 11. Its purpose is to allow the water transported through the water supply pipeline 13 to be converted into steam after being heated in the boiler 11, and transported to the cylinder 14 through the first steam pipeline 12 for power generation. It should be noted that the cylinder 14 can be composed of a high-pressure cylinder 141 and a medium- and low-pressure cylinder 142 (such as Figure 1 As shown in the figure), it can also be composed of a high-pressure cylinder 141, a medium-pressure cylinder and a low-pressure cylinder (not shown in the figure).

[0032] Please continue reading Figure 1 The heat storage and release system 2 includes a molten salt furnace 21, a molten salt circulation pipeline 22, a steam generation pipeline 23, and a molten salt heat exchanger group 20. The molten salt furnace 21 is arranged on the molten salt circulation pipeline 22 so that the low-temperature molten salt in the molten salt circulation pipeline 22 absorbs the heat in the molten salt furnace 21 and turns into high-temperature molten salt and stores energy; the molten salt heat exchanger group 20 is arranged on the heat release pipe section of the molten salt circulation pipeline 22; the steam generation pipeline 23 is connected to the water supply pipeline 13 and the first steam pipeline 12 respectively; and the steam generation pipeline 23 passes through the heat exchanger group to absorb the heat of the heat release pipe section of the molten salt circulation pipeline 22, and turns the water in the steam generation pipeline 23 into steam and enters the cylinder 14 to generate electricity, while turning the high-temperature molten salt into low-temperature molten salt. The specific heat storage and heat release process of the molten salt is as follows: when it is necessary to store heat energy, the molten salt furnace 21 will transfer the heat generated by burning coal gas to the molten salt flowing through it, so that the temperature of the molten salt increases and stores heat energy. These high-temperature molten salts are then pumped to the high-temperature molten salt tank 26 for storage for subsequent use. When heat energy needs to be released, the high-temperature molten salt is extracted from the high-temperature molten salt tank 26 and flows through the molten salt circulation pipeline 22 to the molten salt heat exchanger group 20. In the molten salt heat exchanger group 20, the high-temperature molten salt transfers its stored heat energy to the feed water in the steam generation pipeline 23, raising the feed water temperature, thereby increasing the temperature of the reheated steam and the power generation efficiency. After heat exchange, the temperature of the molten salt decreases, forming medium-temperature or low-temperature molten salt, which is then sent back to the low-temperature molten salt tank 27 to be heated and stored again.

[0033] The thermoelectric system 1 also includes multiple heaters 15 and multiple heating branches 16. The heaters 15 are spaced apart along the water supply line 13 along its extension direction. Each heating branch 16 extends from the outlet of the cylinder 14 and, in a one-to-one correspondence, to the inlet of each heater 15, thereby heating the water in the water supply line 13. In other words, as the water in the water supply line 13 passes through each heater 15, it is preheated by the steam from the cylinder 14, thereby raising its temperature. This design effectively utilizes the heat of the steam in the cylinder 14, improving the thermal energy utilization rate of the entire system.

[0034] It is understood that after the water in the steam generation line 23 absorbs heat from the heat release section of the molten salt circulation line 22, the molten salt in the molten salt circulation line 22 becomes low-temperature molten salt. If the feedwater temperature of the steam generation line 23 is too low, the fluidity of the molten salt in the molten salt circulation line 22 will deteriorate, and there is even a risk of solidification. Conversely, if the feedwater temperature of the reheat circulation line is too high, the molten salt in the molten salt circulation line 22 may overheat, affecting the heat storage efficiency of the molten salt and the stability of the system.

[0035] Therefore, in order to solve the problem of too high or too low water temperature in the steam generation pipeline 23, the heat storage and release system of the present invention is also provided with multiple regulating branches and multiple water supply valves. Figure 2 , each water supply valve 25 is set on each regulating branch 24 in a one-to-one correspondence; each regulating branch 24 extends from the pipe section between two adjacent heaters 15 of the water supply pipeline 13 and / or the pipe section between the heater 15 and the boiler 11 to the steam generating pipeline 23; the opening and closing of each water supply valve 25 is used to select the water entering the steam generating pipeline 23 to be heated by a predetermined number of heaters 15. In this way, by adjusting the opening and closing status of each water supply valve 25, the number of heaters 15 passed by the water entering the steam generating pipeline 23 can be flexibly controlled, thereby achieving the regulation of the water supply temperature. This design enables the system to dynamically adjust the water supply temperature according to actual operating needs and gas fluctuations, so that it is always stable within a preset temperature range (for example, the preset temperature range is 240℃-260℃).

[0036] In summary, please refer to Figure 1 and Figure 2The molten salt coupled coal gas power generation system provided by the present invention includes a thermoelectric system 1 and a heat storage and release system 2. The technical solution is as follows: the thermoelectric system 1 includes a boiler 11, a first steam pipeline 12, a water supply pipeline 13 and a cylinder 14, and the water supply pipeline 13 is connected between the cylinder 14 and the boiler 11; the boiler 11 is arranged between the first steam pipeline 12 and the water supply pipeline 13, so that the water transported by the water supply pipeline 13 is converted into steam after being heated and transported to the cylinder 14 through the first steam pipeline 12 to generate electricity; the heat storage and release system 2 includes a boiler 11, a first steam pipeline 12, a water supply pipeline 13 and a cylinder 14, and the water supply pipeline 13 is connected between the cylinder 14 and the boiler 11; the boiler 11 is arranged between the first steam pipeline 12 and the water supply pipeline 13, so that the water transported by the water supply pipeline 13 is converted into steam after being heated and transported to the cylinder 14 through the first steam pipeline 12 to generate electricity; The system 2 includes a molten salt furnace 21, a molten salt circulation pipeline 22, a steam generation pipeline 23 and a molten salt heat exchanger group 20. The molten salt furnace 21 is arranged on the molten salt circulation pipeline 22 so that the low-temperature molten salt in the molten salt circulation pipeline 22 absorbs the heat in the molten salt furnace 21 and turns into high-temperature molten salt and stores energy; the molten salt heat exchanger group 20 is arranged on the heat release pipe section of the molten salt circulation pipeline 22; the steam generation pipeline 23 is respectively connected to the water supply pipeline 13 and the first steam pipeline 12; and the steam generation pipeline 23 is connected to the water supply pipeline 13 and the first steam pipeline 12 through the heat exchanger. The heat storage and release system 2 further comprises a plurality of regulating branches 24 and a plurality of feed water valves 25, each of which is arranged on a one-to-one basis on each regulating branch 24; each regulating branch 24 extends from a pipe section between two adjacent heaters 15 of the feed water pipe 13 and / or a pipe section between a heater 15 and a boiler 11 to the steam generating pipe 23; the opening and closing of each feed water valve 25 is used to select the water entering the steam generating pipe 23 to be heated by a predetermined number of heaters 15.

[0037] In general, the molten salt coupled coal gas power generation system provided by the present invention achieves efficient storage and flexible release of thermal energy through the coupling of the thermoelectric system 1 and the heat storage and release system 2. At the same time, through the design of multiple heaters 15 and heating branches 16, multi-stage preheating of the water in the water supply pipeline 13 is achieved, effectively utilizing the steam heat in the cylinder 14. More importantly, the present invention, with the help of the configuration of multiple regulating branches 24 and water supply valves 25, enables the system to dynamically adjust the number of heaters 15 through which the water entering the steam generation pipeline 23 flows by adjusting the opening and closing states of each water supply valve 25 according to actual operating requirements and gas fluctuation conditions. This process ensures that the water supply temperature can be controlled and stabilized within a preset temperature range. In this way, the present invention ensures that after the water in the steam generation pipeline 23 absorbs heat, it can maintain the molten salt in the molten salt circulation pipeline 22 within the ideal operating temperature range. This not only ensures the fluidity of the molten salt, but also avoids the problem of molten salt overheating, thereby improving the heat storage efficiency of the molten salt and the stability of the entire system.

[0038] In some embodiments, see Figure 1 and Figure 2 To maximize the thermal energy of steam and reduce the problem of excessive pressure within a single cylinder 14, the cylinder 14 comprises a high-pressure cylinder 141 and intermediate- and low-pressure cylinders 142. Specifically, the first steam line 12 comprises a main steam line 121 and a reheat steam line 122. The main steam line 121 is connected to the steam outlet of the boiler 11 at one end and to the inlet of the high-pressure cylinder 141 at the other. The reheat steam line 122 is connected to the outlet of the high-pressure cylinder 141 at one end and to the inlets of the intermediate- and low-pressure cylinders 142 at the other end, passing through the boiler 11. This solution allows some steam from the boiler 11 to flow through the main steam line 121 to the high-pressure cylinder 141, where it rotates the blades within the high-pressure cylinder 141, generating high-pressure steam work. After completing the high-pressure work, the steam is discharged through the outlet of the high-pressure cylinder 141 and enters the reheat steam line 122. In the reheat steam line 122, the steam is heated again by the boiler 11 to increase its temperature and pressure. The heated steam then enters the intermediate and low-pressure cylinders 142, driving the blades inside to continue rotating, thereby generating electricity. This design not only improves the thermal energy utilization of the steam but also effectively alleviates the problem of excessive pressure within a single cylinder 14, enhancing the safety and stability of the system.

[0039] To implement staged preheating, see Figure 1 and Figure 2The multiple heaters 15 include several high-pressure heaters 151 and several low-pressure heaters 152. The specific solution is as follows: the high-pressure heater 151 is closer to the boiler 11 than the low-pressure heater 152; the multiple heating branches 16 include several high-pressure heating branches 161 and several low-pressure heating branches 162, each high-pressure heating branch 161 extends from the outlet of the high-pressure cylinder 141 and extends one-to-one to the inlet of each high-pressure heater 151, and each low-pressure heating branch 162 extends from the outlet of the medium- and low-pressure cylinders 142 and extends one-to-one to the inlet of each low-pressure heater 152; and one end of the water supply pipeline 13 is connected to the outlet of the medium- and low-pressure cylinders 142, and the other end is connected to the water supply port of the boiler 11. This solution can achieve: the steam from the medium- and low-pressure cylinders 142 is introduced into the corresponding low-pressure heater 152 through the low-pressure heating branch 162, and the water in the water supply pipeline 13 is preheated. Similarly, steam from the high-pressure cylinder 141 is introduced into the corresponding high-pressure heater 151 through the high-pressure heating branch 161 to further preheat the feed water. This staged preheating method not only improves the utilization rate of thermal energy, but also allows the feed water to reach a higher temperature before entering the boiler 11, thereby improving the power generation efficiency of the entire system.

[0040] Each regulating branch 24 extends from the pipe section between two adjacent high-pressure heaters 151 of the feedwater pipeline 13 and / or the pipe section between the high-pressure heater 151 and the boiler 11 to the steam generation pipeline 23. This shows that each regulating branch 24 is connected to the higher-temperature portion of the feedwater pipeline 13, rather than the lower-temperature portion. Therefore, the water in the feedwater pipeline 13 must flow through each low-pressure heater 152 in sequence, without having to flow through each high-pressure heater 151 in sequence. In other words, the water in the feedwater pipeline 13 will first be gently heated by the low-pressure heater 152, rather than skipping the low-pressure heater 152 and being rapidly heated directly by the high-pressure heater 151.

[0041] In some embodiments, please refer to Figure 1 and Figure 2To achieve both feedwater temperature regulation in the evaporation generation pipeline and facilitate the layout of the regulating branches 24 and feedwater valve 25, two regulating branches 24 and two feedwater valves 25 are provided. Specifically, the multiple high-pressure heaters 151 include a first high-pressure heater 1511 and a second high-pressure heater 1512, which are adjacent to each other. Along the extension direction of the feedwater pipeline 13, the first high-pressure heater 1511 is closer to the boiler 11 than the second high-pressure heater 1512. The multiple regulating branches 24 include a first regulating branch 241 and a second regulating branch 242. The first regulating branch 241 extends from the pipe section between the first high-pressure heater 1511 and the boiler 11 of the feedwater pipeline 13 to the steam generation pipeline 23. The second regulating branch 242 extends from the pipe section between the first high-pressure heater 1511 and the second high-pressure heater 1512 of the feedwater pipeline 13 to the steam generation pipeline 23. The plurality of water supply valves 25 include a first water supply valve 251 and a second water supply valve 252. The first water supply valve 251 is provided on the first regulating branch 241, and the second water supply valve 252 is provided on the second regulating branch 242. One of the first water supply valve 251 and the second water supply valve 252 is open, and the other is closed.

[0042] When it is necessary to increase the temperature of the water entering the steam generating pipeline 23, the first water supply valve 251 can be opened and the second water supply valve 252 can be closed. In this state: the water in the water supply pipeline 13 flows through the upper heat exchangers in sequence (for example, the upper heat exchangers include all low-pressure heaters 152 and one high-pressure heat exchanger), and then flows through the second high-pressure heater 1512 and the first high-pressure heater 1511 in sequence, and then enters the first regulating branch 241 and enters the steam generating pipeline 23, thereby absorbing more heat. On the contrary, when it is necessary to lower the feed water temperature entering the steam generating pipeline 23, the first feed water valve 251 can be closed and the second feed water valve 252 can be opened. In this state: the water in the feed water pipeline 13 flows through each of the upstream heat exchangers in sequence (for example, each of the upstream heat exchangers includes all low-pressure heaters 152 and one high-pressure heat exchanger), then flows through the second high-pressure heater 1512 and then enters the second regulating branch 242, thereby bypassing the first high-pressure heater 1511 and directly entering the steam generating pipeline 23, thereby reducing the amount of heat absorbed.

[0043] By flexibly adjusting the opening and closing states of first and second water supply valves 251 and 252, this embodiment of the present invention precisely controls the number of heaters 15 through which water entering steam generation pipeline 23 flows, thereby enabling flexible adjustment of the feedwater temperature. This design not only enhances system operational flexibility but also ensures that the feedwater temperature remains within the desired temperature range, thereby guaranteeing the stability and efficiency of the entire molten salt-coupled coal gas power generation system.

[0044] In some embodiments, please refer to Figure 1 and Figure 2 In order to keep the mixed temperature of the steam in each high-pressure heating branch 161 consistent when it returns to water after passing through the high-pressure heater 151, a first connecting pipe 163 is provided. The specific solution is: a deaerator 17 is provided between the adjacent high-pressure heater 151 and the low-pressure heater 152 in the water supply pipeline 13; a first connecting pipe 163 is provided between two adjacent high-pressure heaters 151 and between the adjacent high-pressure heater 151 and the deaerator 17. In other words, the first connecting pipe 163 introduces the water in the lower-level high-pressure heater 151 used to heat the water supply pipeline 13 into the upper-level high-pressure heater 151 step by step until it is introduced into the deaerator 17. In this way, the temperature of the water introduced into each high-pressure heater 151 is not much different.

[0045] In the embodiment of the present invention, by providing a first connecting pipe 163, water can be introduced step by step between adjacent high-pressure heaters 151 and between the high-pressure heater 151 and the deaerator 17. This method not only optimizes the path of the water flow, but also helps to maintain the relative stability of the water temperature in each stage of the high-pressure heater 151. More specifically, when water is introduced from the lower-level high-pressure heater 151 to the upper-level high-pressure heater 151, the similarity of the water temperature reduces the thermal stress problem caused by the large temperature difference, thereby extending the service life of the high-pressure heater 151. At the same time, this step-by-step introduction method also helps to improve the utilization efficiency of thermal energy, ensuring that each stage of the high-pressure heater 151 can fully exert its heating effect.

[0046] The installation of deaerator 17 further enhances system performance. In a molten salt-coupled coal gas power generation system, a certain amount of dissolved oxygen may occur in the water in the water supply pipeline 13. If this oxygen is not removed, it may cause adverse effects such as corrosion to the system. Deaerator 17 effectively removes oxygen from the water, protecting the system from corrosion. Furthermore, deaerator 17 regulates the temperature and pressure of the water in the water supply pipeline 13, making it more suitable for the subsequent heating and power generation processes.

[0047] In some embodiments, please refer to Figure 1 and Figure 2In order to keep the mixed temperature of the steam in each low-pressure heating branch 162 consistent when returning to water after passing through the low-pressure heater 152, a second connecting pipe 164 is provided. The specific solution is: the feed water pipeline 13 is provided with a condenser 18 between the low-pressure heater 152 and the medium and low-pressure cylinder 142; a second connecting pipe 164 is provided between two adjacent low-pressure heaters 152 and between the adjacent low-pressure heaters 152 and the medium and low-pressure cylinder 142. In other words, the second connecting pipe 164 introduces the water in the next-stage low-pressure heater 152 used to heat the feed water pipeline 13 into the upper-stage low-pressure heater 152 step by step until it is introduced into the condenser 18. In this way, the temperature of the water introduced into each low-pressure heater 152 is not much different.

[0048] In this embodiment of the present invention, by providing a second connecting pipe 164, water can be introduced stepwise between adjacent low-pressure heaters 152 and between the low-pressure heaters 152 and the condenser 18. This design optimizes the water flow path and helps maintain stable water temperatures within each level of the low-pressure heaters 152. When water is introduced from the lower-level low-pressure heater 152 to the upper-level low-pressure heater 152, the similar water temperatures reduce thermal stress caused by large temperature differences, thereby extending the service life of the low-pressure heaters 152. Furthermore, this stepwise introduction method helps improve the efficiency of thermal energy utilization, ensuring that each level of low-pressure heater 152 can fully utilize its heating function. The provision of the condenser 18 further enhances system performance. In a molten salt-coupled coal gas power generation system, the condenser 18 condenses steam and converts it into liquid water for subsequent recycling. This process not only recovers the heat energy in the steam but also helps maintain the water balance of the system. Furthermore, the condenser 18 reduces the pressure and temperature of the exhaust steam, improving the thermal efficiency of the entire system.

[0049] It is understood that when the high-pressure heater 151 needs to be deactivated due to a fault or other reasons, it is necessary to cut off the connection between the water supply pipe 13 and the high-pressure heater 151. If a backup system is not configured, the power generation process will be interrupted.

[0050] In some embodiments, see Figure 1In order to ensure the continuity of power generation, the power generation system is also equipped with a high-pressure heater 151 cut-off system. Specifically: the high-pressure heater cut-off system 3 includes a first water supply branch 31, a second water supply branch 32, a high-pressure heater cut-off preheating pipeline 33 and a low-load preheater 34. The first water supply branch 31 extends from the pipe section between the adjacent high-pressure heater 151 and the low-pressure heater 152 to the steam generation pipeline 23; and the first water supply branch 31 passes through the low-load preheater 34. That is, the first water supply branch 31 is used to supply water to the steam generation pipeline 23. The second water supply branch 32 extends from the pipe section between the adjacent high-pressure heater 151 and the low-pressure heater 152 to the water supply port of the boiler 11. That is, the second water supply branch 32 is used to supply water to the steam boiler 11. The high-pressure heater cut-off preheating pipeline 33 extends from the outlet of the high-pressure cylinder 141 to the pipe section between the adjacent high-pressure heater 151 and the low-pressure heater 152. The low-load preheater 34 is arranged on the high-pressure heater cut-off preheating pipeline 33. That is, the high-pressure heater cut-off preheating pipeline 33 is used to preheat the water in the first water supply branch 31. Among them, a steam valve 35 is provided on the high-pressure heater cut-off preheating pipeline 33 to allow or prevent the steam in the high-pressure cylinder 141 from entering the low-load preheater 34; the first water supply branch 31 and the second water supply branch 32 are provided with a cut-off valve 36 at one end close to the water supply pipeline 13. For example, the cut-off valve 36 is specifically arranged on the main pipeline at the inlet end of the first water supply branch 31 and the second water supply branch 32; to allow or prevent the water in the water supply pipeline 13 from entering the first water supply branch 31 and the second water supply branch 32.

[0051] It is understandable that the high pressure cut-off condition and the normal operating condition cannot be carried out at the same time.

[0052] See also Figure 1 and Figure 2 Under normal operating conditions of the power generation system, the water in the water supply pipe 13 should pass through the high-pressure heater 151 and avoid flowing through the first water supply branch 31 and the second water supply branch 32. The specific operation is: close the cut-off valve to prevent the water in the water supply pipe 13 from flowing into the first water supply branch 31 and the second water supply branch 32; at the same time, close the steam valve 35 to prevent the steam in the high-pressure cylinder 141 from entering the low-load preheater 34. According to actual needs, open or close the first water supply valve 251 and the second water supply valve 252 in a timely manner to adjust the water supply temperature in the steam generation pipe 23. In this way, the water in the water supply pipe 13 will follow the normal process, and will be preheated and heated in turn through each low-pressure heater 152 and the selected high-pressure heater 151, and finally enter the boiler 11 and the steam generation pipe 23 to prepare for the subsequent power generation process.

[0053] Under the high-pressure cut-off condition, the high-pressure heater 151 should be cut off, so that the water in the water supply pipe 13 bypasses the high-pressure heater 151 and is transported through the first water supply branch 31 and the second water supply branch 32. The specific operating steps are as follows: First, close the first water supply valve 251 and the second water supply valve 252, and open the cut-off valve to allow water to flow into the first water supply branch 31 and the second water supply branch 32. The first water supply branch 31 is mainly responsible for supplying water to the steam generating pipe 23, while the second water supply branch 32 is mainly responsible for supplying water to the boiler 11. At the same time, open the steam valve 35 to guide the steam in the high-pressure cylinder 141 to flow to the low-load preheater 34, preheating the water in the first water supply branch 31, thereby increasing its temperature.

[0054] In summary, the embodiment of the present invention, through the design of the high-pressure heater removal system 3, provides an operating solution for the high-pressure heater 151 removal condition. By controlling the opening and closing states of the four valves—the removal valve 36, the steam valve 35, the first feedwater valve 251, and the second feedwater valve 252—flexible adjustment of the water flow path is achieved. This avoids system downtime caused by the removal of the high-pressure heater 151 and ensures the continuity of the power generation process.

[0055] In some embodiments, see Figure 1 To improve deaeration efficiency, a HCHP cut-off preheating line 33 is configured. Specifically, it extends from the outlet of the high-pressure cylinder 141 to the inlet of the deaerator 17. With this configuration, during HCHP cut-off operation, the steam in HCHP cut-off preheating line 33 cools after passing through the low-load preheater 34 and ultimately flows into the deaerator 17.

[0056] By extending the high-pressure heater preheating line 33 to the inlet of the deaerator 17, this embodiment of the present invention not only effectively preheats the water in the first water feed branch 31 but also fully utilizes the preheated steam. This steam further participates in the deoxygenation process within the deaerator 17, helping to improve deoxygenation efficiency. This also recovers waste heat from the steam, increasing the thermal energy efficiency of the entire system. Furthermore, this arrangement simplifies the system's piping layout, reducing the complexity of installation and maintenance.

[0057] In some embodiments, see Figure 1 and Figure 3To fully release the molten salt's heat, the internal structure of the molten salt heat exchanger assembly 20 has been rationally designed. Specifically, the molten salt heat exchanger assembly 20 includes a preheater 201, an evaporator 202, a steam drum 203, and a superheater 204. The heat-releasing section of the molten salt circulation pipeline 22 passes sequentially through the superheater 204, the evaporator 202, and the preheater 201. The heat-absorbing section of the steam generation pipeline 23 passes sequentially through the preheater 201, the steam drum 203, and the superheater 204. An evaporation pipe 205 is connected between the evaporator 202 and the steam drum 203. This allows water in the steam drum 203 to be drawn into the evaporator 202 to absorb heat and convert it into steam, which is then returned to the steam drum 203.

[0058] With this setup, the molten salt releases high-temperature heat energy in the superheater 204 and heats the steam in the steam generation line 23, causing it to reach a superheated state, thereby increasing the steam's enthalpy and work capacity. The molten salt is then transferred to the evaporator 202, where it continues to release heat. Because the steam drum 203 and evaporator 202 are connected via the evaporator tube 205, a steam-water separation process occurs within the steam drum 203. The steam is returned to the superheater 204, while the water flows into the evaporator 202 through the evaporator tube 205 to absorb more heat and ultimately convert into steam. This steam is then returned to the steam drum 203 through the evaporator tube 205, mixed with the steam already in the drum 203, and then flows into the superheater 204.

[0059] By rationally configuring the internal structure of the molten salt heat exchanger assembly 20, the present embodiment not only ensures the full release of molten salt heat but also achieves efficient heat utilization. The coordinated operation of the preheater 201, evaporator 202, steam drum 203, and superheater 204 enables a continuous heating process from feedwater to steam, improving steam quality and power generation efficiency.

[0060] It is understood that the temperature inside the molten salt furnace 21 is extremely high, while the temperature of the molten salt after cooling through the molten salt heat exchanger assembly 20 is relatively low. If the lower-temperature molten salt is directly pumped into the molten salt furnace 21 for heating, it will easily lead to reduced thermal efficiency in the molten salt furnace 21 and may cause temperature fluctuations in the molten salt furnace 21, thereby affecting the stability and efficiency of the entire power generation system.

[0061] In some embodiments, see Figure 1 and Figure 3To address this issue, a molten salt temperature regulation solution has been proposed. Specifically, the heat storage and release system 2 also includes a high-temperature molten salt tank 26, a low-temperature molten salt tank 27, and a preheating furnace 28. Along the molten salt circulation pipeline 22, the low-temperature molten salt tank 27, the preheating furnace 28, the molten salt furnace 21, and the high-temperature molten salt tank 26 are sequentially spaced apart. The exhaust pipe of the molten salt furnace 21 and / or the boiler 11 is connected to the preheating furnace 28 to preheat the molten salt from the low-temperature molten salt tank 27. This allows the preheating furnace 28 to preheat the low-temperature molten salt.

[0062] The embodiment of the present invention optimizes the temperature management of molten salt by providing a high-temperature molten salt tank 26, a low-temperature molten salt tank 27 and a preheating furnace 28. During the molten salt circulation process, the low-temperature molten salt tank 27 stores molten salt with a lower temperature, which is then sent to the preheating furnace 28 for preheating. The preheating furnace 28 uses the exhaust heat of the molten salt furnace 21 or the boiler 11 to heat the molten salt, thereby increasing the temperature of the molten salt and making it closer to the operating temperature in the molten salt furnace 21. The preheated molten salt then enters the molten salt furnace 21 for further heating to reach the required high temperature state. The high-temperature molten salt tank 26 is used to store molten salt that has been heated to a high temperature for use by the molten salt heat exchanger group 20.

[0063] This configuration not only improves the thermal efficiency of molten salt furnace 21 and reduces energy loss, but also helps maintain a stable temperature within furnace 21. By preheating the molten salt, reduced thermal efficiency and temperature fluctuations in furnace 21 caused by excessively low molten salt temperatures are avoided. Furthermore, the use of preheating furnace 28 recycles exhaust heat, improving the overall system's thermal efficiency.

[0064] In some embodiments, see Figure 1 and Figure 3 To achieve more efficient gradient heating of the molten salt, a molten salt temperature control tank 29 and a high-temperature molten salt branch 221 are installed. These work in conjunction with the preheating furnace 28 and the molten salt furnace 21 to achieve partial circulation heating of the molten salt. Specifically, the molten salt temperature control tank 29 is located between the preheating furnace 28 and the molten salt furnace 21, allowing the flow of medium-temperature molten salt preheated by the preheating furnace 28. The high-temperature molten salt branch 221 extends from the section of the molten salt circulation pipeline 22 between the molten salt furnace 21 and the high-temperature molten salt tank 26 to the molten salt temperature control tank 29, allowing the flow of a portion of the high-temperature molten salt heated by the molten salt furnace 21.

[0065] This embodiment of the present invention further optimizes molten salt temperature management by equipping it with a molten salt temperature control tank 29 and a high-temperature molten salt branch 221. During the molten salt circulation process, the medium-temperature molten salt preheated in the preheating furnace 28 flows into the molten salt temperature control tank 29 for temperature regulation. Simultaneously, some of the high-temperature molten salt heated in the molten salt furnace 21 flows back into the molten salt temperature control tank 29 through the high-temperature molten salt branch 221, mixing with the medium-temperature molten salt to achieve temperature equilibrium.

[0066] This arrangement not only helps maintain a stable molten salt temperature but also enables more efficient gradient heating of the molten salt. By regulating the temperature of the molten salt in the molten salt temperature control tank 29, the temperature of the molten salt entering the molten salt heat exchanger assembly 20 can be more accurately controlled, thereby improving heat transfer efficiency and overall system performance. Furthermore, the provision of the high-temperature molten salt branch 221 fully utilizes the high-temperature molten salt, avoiding energy waste.

[0067] In general, see Figure 1 、 Figure 2 and Figure 3 , the embodiment of the present invention realizes stable control of the feed water temperature of the steam generating pipeline 23 by setting the feed water valve 25 and the regulating branch 24. At the same time, by setting the connecting pipe, deaerator 17, condenser 18 and other components, step heating and stable reflux of water in each pipeline are realized, thereby extending the service life of the equipment. In addition, the provision of the high-pressure heater cut-off system 3 ensures the continuity of the power generation process and avoids the system shutdown caused by the removal of the high-pressure heater 151. The reasonable setting of the internal structure of the molten salt heat exchanger group 20 and the optimization of the heat storage and release system 2 further improve the heat release efficiency of the molten salt and the thermal energy utilization efficiency of the system. Not only is the flexibility and stability of the molten salt coupled coal gas power generation system improved, but also the thermal energy utilization efficiency of the system is improved.

[0068] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A flexibly adjustable molten salt coupled coal gas power generation system, characterized in that: include: A thermoelectric system includes a boiler, a first steam pipeline, a water supply pipeline, and a cylinder, wherein the water supply pipeline is connected between the cylinder and the boiler; the boiler is arranged between the first steam pipeline and the water supply pipeline so that water transported by the water supply pipeline is heated and converted into steam, which is then transported to the cylinder through the first steam pipeline to generate electricity; A heat storage and release system includes a molten salt furnace, a molten salt circulation pipeline, a steam generation pipeline, and a molten salt heat exchanger group. The molten salt furnace is arranged on the molten salt circulation pipeline so that the low-temperature molten salt in the molten salt circulation pipeline absorbs heat from the molten salt furnace to become high-temperature molten salt and store energy. The molten salt heat exchanger group is arranged on the heat release pipe section of the molten salt circulation pipeline. The steam generation pipeline is connected to the water supply pipeline and the first steam pipeline respectively. Moreover, the steam generation pipeline passes through the heat exchanger group to absorb heat from the heat release pipe section of the molten salt circulation pipeline, and converts the water in the steam generation pipeline into steam that enters the cylinder to generate electricity, while converting the high-temperature molten salt into the low-temperature molten salt. The thermoelectric system further comprises a plurality of heaters and a plurality of heating branches, wherein the heaters are arranged at intervals on the water supply pipeline; the heating branches extend from the outlet of the cylinder and extend to the inlet of each heater in a one-to-one correspondence, so as to heat the water in the water supply pipeline respectively; The heat storage and release system also includes multiple regulating branches and multiple water supply valves, and each of the water supply valves is arranged one by one on each of the regulating branches; each of the regulating branches extends from the pipe section between two adjacent heaters of the water supply pipeline and / or the pipe section between the heater and the boiler to the steam generation pipeline; the opening and closing of each of the water supply valves is used to control the water entering the steam generation pipeline to be heated by a predetermined number of heaters.

2. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 1 is characterized in that: The cylinder includes a high-pressure cylinder and a medium- and low-pressure cylinder. The first steam pipeline includes a main steam pipeline and a reheat steam pipeline. One end of the main steam pipeline is connected to the steam outlet of the boiler, and the other end is connected to the inlet of the high-pressure cylinder. One end of the reheat steam pipeline is connected to the outlet of the high-pressure cylinder, and the other end is connected to the inlet of the medium and low-pressure cylinders, and passes through the boiler; one end of the water supply pipeline is connected to the outlet of the medium and low-pressure cylinders, and the other end is connected to the water supply port of the boiler; The multiple heaters include a plurality of high-pressure heaters and a plurality of low-pressure heaters, wherein the high-pressure heaters are closer to the boiler than the low-pressure heaters; the multiple heating branches include a plurality of high-pressure heating branches and a plurality of low-pressure heating branches, wherein each of the high-pressure heating branches extends from the outlet of the high-pressure cylinder and extends one-to-one to the inlet of each of the high-pressure heaters, and each of the low-pressure heating branches extends from the outlet of the medium- and low-pressure cylinders and extends one-to-one to the inlet of each of the low-pressure heaters; Wherein, each regulating branch extends from a pipe section between two adjacent high-pressure heaters of the water feed pipe and / or a pipe section between the high-pressure heater and the boiler to the steam generating pipe.

3. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 2 is characterized in that: The plurality of high-pressure heaters include a first high-pressure heater and a second high-pressure heater disposed adjacent to each other, wherein the first high-pressure heater is closer to the boiler than the second high-pressure heater; The plurality of regulating branches include a first regulating branch and a second regulating branch, the first regulating branch extending from a pipe section between the first high-pressure heater and the boiler of the feedwater pipeline to the steam generating pipeline, and the second regulating branch extending from a pipe section between the first high-pressure heater and the second high-pressure heater of the feedwater pipeline to the steam generating pipeline; The plurality of water supply valves include a first water supply valve and a second water supply valve, the first water supply valve is arranged on the first regulating branch, and the second water supply valve is arranged on the second regulating branch; Wherein, one of the first water supply valve and the second water supply valve is opened, and the other is closed.

4. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 2 is characterized in that: The water supply pipeline is provided with a deaerator between the adjacent high-pressure heater and the low-pressure heater; a first connecting pipe is provided between two adjacent high-pressure heaters and between the adjacent high-pressure heater and the deaerator.

5. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 2, characterized in that: The water supply pipeline is provided with a condenser between the low-pressure heater and the medium- and low-pressure cylinders; a second connecting pipe is provided between two adjacent low-pressure heaters and between the adjacent low-pressure heaters and the medium- and low-pressure cylinders.

6. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 2, characterized in that: The system also includes a high-pressure heater removal system, which includes a first water supply branch, a second water supply branch, a high-pressure heater removal preheating pipeline, and a low-load preheater provided on the high-pressure heater removal preheating pipeline; The first water supply branch is a pipe section between the adjacent high-pressure heater and the low-pressure heater, extending to the steam generation pipeline; The first water supply branch passes through the low-load preheater; The second water supply branch is a pipe section between the adjacent high-pressure heater and the low-pressure heater, extending to the water supply port of the boiler; The high pressure heater removal preheating pipeline extends from the outlet of the high pressure cylinder to the pipe section between the adjacent high pressure heater and the low pressure heater; Among them, a steam valve is provided on the high-pressure cut-off preheating pipeline to allow or prevent the steam in the high-pressure cylinder from entering the low-load preheater; the first water supply branch and the second water supply branch are provided with a cut-off valve at one end close to the water supply pipeline to allow or prevent the water in the water supply pipeline from entering the first water supply branch and the second water supply branch.

7. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 6, characterized in that: The water supply pipeline is provided with a deaerator in the pipe section between the adjacent high-pressure heater and the low-pressure heater; The high pressure heater cut-off preheating pipeline extends from the outlet of the high pressure cylinder to the inlet of the deaerator.

8. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 1, characterized in that: The molten salt heat exchanger group includes a preheater, an evaporator, a steam drum and a superheater; the heat release pipe section of the molten salt circulation pipeline passes through the superheater, the evaporator and the preheater in sequence, and the heat absorption pipe section of the steam generation pipeline passes through the preheater, the steam drum and the superheater in sequence; An evaporation pipe is connected between the evaporator and the steam drum to introduce water in the steam drum into the evaporator to absorb heat and turn into steam, and then introduce the steam back into the steam drum.

9. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 1, characterized in that: The heat storage and release system further includes a high-temperature molten salt tank, a low-temperature molten salt tank and a preheating furnace; along the extension direction of the molten salt circulation pipeline, the low-temperature molten salt tank, the preheating furnace, the molten salt furnace and the high-temperature molten salt tank are sequentially arranged on the molten salt circulation pipeline; Wherein, the exhaust pipe of the molten salt furnace and / or the boiler is connected to the preheating furnace to preheat the molten salt from the low-temperature molten salt tank.

10. The flexibly adjustable molten salt coupled coal gas power generation system according to claim 9, characterized in that: The heat storage and release system also includes a molten salt temperature regulating tank and a high-temperature molten salt branch. The molten salt temperature regulating tank is arranged between the preheating furnace and the molten salt furnace to allow the medium-temperature molten salt preheated by the preheating furnace to flow in; the high-temperature molten salt branch is a pipe section between the molten salt furnace and the high-temperature molten salt tank of the molten salt circulation pipeline, extending to the molten salt temperature regulating tank to allow part of the high-temperature molten salt heated by the molten salt furnace to flow in.

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