Fused salt heat storage peak shaving system

Abstract

The invention provides a fused salt heat storage peak shaving system, and relates to the technical field of energy storage, the fused salt heat storage peak shaving system comprises a salt bath fused salt assembly, a fused salt heat storage and release assembly and a steam-water assembly, the salt bath fused salt assembly comprises a plurality of fused salt grooves and a plurality of fused salt circulation pipelines, and the fused salt heat storage and release assembly comprises a low-temperature fused salt tank, a high-temperature fused salt tank, a heat storage pipeline and a heat release pipeline. The steam-water assembly comprises a steam turbine and a steam-water circulation pipeline, a steam generation structure is arranged between the steam-water circulation pipeline and the heat release pipeline and used for generating saturated steam through heat in the heat release pipeline, and the steam turbine is used for generating power through the saturated steam. The system can convert the high-temperature waste heat, which is originally difficult to recover, of the smelted finished product into a continuous and stable heat source for power generation or industrial heat supply, overcomes the problem of temperature fluctuation, realizes stable and controllable output, can be better suitable for industrial scenes, and has the advantages of efficient recovery, flexible peak regulation, high stability and reliability and the like.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a molten salt heat storage and peak regulation system. Background Art

[0002] With rapid economic development and accelerated industrialization, the contradiction between energy shortages and high energy consumption is becoming increasingly prominent. Energy storage technology, as a key enabler of the energy revolution, can effectively address the issue of large-scale renewable energy integration while improving the efficiency, safety, and affordability of power and regional energy systems. Among various energy storage technologies, molten salt thermal storage, with its wide temperature range, large heat capacity, and high heat exchange efficiency, offers the advantages of cleanliness and efficiency, enabling flexible and stable thermal energy support for thermal power generation equipment. Currently, molten salt thermal storage technology has found limited application in solar thermal power generation. However, in industrial scenarios such as continuous high-speed wire heat treatment, the intermittent delivery of finished smelting products results in discontinuous waste heat recovery, reducing energy utilization efficiency and making it difficult to meet the demand for a stable heat source for industrial production. For high-temperature waste heat generated by industries such as steel, optimizing molten salt thermal storage systems to address temperature fluctuations and convert intermittent, difficult-to-recover heat into a continuous, stable heat source would not only bring significant economic benefits but also effectively promote energy conservation and consumption reduction, significantly improving both the economic and social benefits of enterprises. Therefore, how to develop an efficient molten salt heat storage technology suitable for industrial scenarios to overcome temperature fluctuation problems and achieve stable output has become a technical problem that needs to be solved urgently. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a molten salt heat storage peak regulation system for overcoming the temperature fluctuation problem and achieving stable output.

[0004] The above-mentioned object of the present invention can be achieved by adopting the following technical solutions. The present invention provides a molten salt heat storage peak regulation system, comprising:

[0005] A salt bath molten salt assembly, comprising a plurality of molten salt tanks arranged in sequence along the conveying direction of the smelted product, and a plurality of molten salt circulation pipelines for respectively connecting the molten salt tanks, wherein the plurality of molten salt tanks are used to cool the smelted product step by step;

[0006] A molten salt heat storage and release component, comprising a low-temperature molten salt tank, a high-temperature molten salt tank, a heat storage pipeline for connecting the low-temperature molten salt tank and the high-temperature molten salt tank, and a heat release pipeline for connecting the high-temperature molten salt tank and the low-temperature molten salt tank. A molten salt heat exchange structure is provided between the heat storage pipeline and each of the molten salt circulation pipelines, and the molten salt heat exchange structure is used to replace the heat in each of the molten salt circulation pipelines into the heat storage pipeline;

[0007] A steam-water component includes a steam turbine and a steam-water circulation pipeline for connecting the steam turbine. A steam generating structure is provided between the steam-water circulation pipeline and the heat release pipeline. The steam generating structure is used to generate saturated steam through the heat in the heat release pipeline. The steam turbine is used to generate electricity through saturated steam.

[0008] In a preferred embodiment of the present invention, the molten salt heat storage and peak-shaving system also includes a water cooling component, which includes a water cooling tank arranged downstream of the salt bath molten salt component, and a water cooling circulation pipeline for connecting the water cooling tank, and a cooling water heat exchange structure is provided between the steam-water circulation pipeline and the water cooling circulation pipeline, and the cooling water heat exchange structure is used to replace the heat in the water cooling circulation pipeline to the steam-water circulation pipeline.

[0009] In a preferred embodiment of the present invention, the cooling water heat exchange structure includes a cooling water heat exchanger arranged between the steam-water circulation pipeline and the water-cooling circulation pipeline.

[0010] In a preferred embodiment of the present invention, a cooling water circulation pump is provided on the water cooling circulation pipeline.

[0011] In a preferred embodiment of the present invention, the molten salt heat storage and peak-shaving system also includes a water cooling component, which includes an external open cooling pipeline. A cooling water heat exchange structure is provided between the steam-water circulation pipeline and the external open cooling pipeline. The cooling water heat exchange structure is used to replace the heat in the external open cooling pipeline to the steam-water circulation pipeline.

[0012] In a preferred embodiment of the present invention, the multiple molten salt tanks include at least a high-temperature molten salt tank and a medium-temperature molten salt tank. Along the transportation direction of the smelted products, the high-temperature molten salt tank is arranged upstream of the medium-temperature molten salt tank. The multiple molten salt circulation pipelines include at least a high-temperature molten salt circulation pipeline for connecting the high-temperature molten salt tanks, and a medium-temperature molten salt circulation pipeline for connecting the medium-temperature molten salt tanks. The high-temperature molten salt circulation pipeline is provided with a high-temperature molten salt tank circulation pump, and the medium-temperature molten salt circulation pipeline is provided with a medium-temperature molten salt tank circulation pump.

[0013] In a preferred embodiment of the present invention, the molten salt heat exchange structure includes a medium-temperature molten salt heat exchanger arranged between the heat storage pipeline and the medium-temperature molten salt circulation pipeline, and a high-temperature molten salt heat exchanger arranged between the heat storage pipeline and the high-temperature molten salt circulation pipeline.

[0014] In a preferred embodiment of the present invention, a low-temperature molten salt heat absorption pump is provided on the heat storage pipeline, and the low-temperature molten salt heat absorption pump is arranged between the low-temperature molten salt tank and the medium-temperature molten salt heat exchanger; and / or, a heat release pump is provided on the heat release pipeline, and the heat release pump is arranged between the high-temperature molten salt tank and the superheater.

[0015] In a preferred embodiment of the present invention, a condenser and a feed water pump are provided on the steam-water circulation pipeline, and the condenser and the feed water pump are sequentially arranged downstream of the steam turbine.

[0016] In a preferred embodiment of the present invention, the steam generating structure includes a superheater, an evaporator, a feed water preheater and a steam drum, the heat release pipeline is connected to the first heat exchange channel of the superheater, the first heat exchange channel of the evaporator and the first heat exchange channel of the feed water preheater, the steam-water circulation pipeline is connected to the second heat exchange channel of the feed water preheater, the steam drum and the second heat exchange channel of the superheater, and the steam drum is connected to the second heat exchange channel of the evaporator.

[0017] In a preferred embodiment of the present invention, the molten salt heat storage and peak-shaving system also includes a salt diversion pipeline and a salt diversion tank arranged on the salt diversion pipeline. The outlet of the salt diversion pipeline is connected to the low-temperature molten salt tank, and the inlet of the salt diversion pipeline is used to connect to the heat release pipeline.

[0018] In a preferred embodiment of the present invention, the salt removal pipeline is provided with multiple inlets, namely a first inlet, a second inlet and a third inlet. The first inlet is located between the superheater and the evaporator, the second inlet is located between the evaporator and the feed water preheater, and the third inlet is located downstream of the feed water preheater.

[0019] In a preferred embodiment of the present invention, a salt drainage pump is provided on the salt drainage pipeline, a heater is provided on the salt drainage tank and / or an agitator is provided in the salt drainage tank.

[0020] The technical solution of the present invention has the following significant beneficial effects:

[0021] When the molten salt heat storage and peak-shaving system described in the present invention is used, the salt bath molten salt component, the molten salt heat storage and release component, and the steam-water component are coordinated to achieve effective recovery and continuous and stable output of high-temperature waste heat from the smelting finished product. Specifically, by cooling the smelting finished product step by step through the salt bath molten salt component, the high-temperature waste heat of the smelting finished product can be effectively recovered, reducing energy waste and overcoming the problem of intermittent transportation of the smelting finished product. Molten salt heat storage technology has a high heat storage capacity and thermal stability. By coordinating the molten salt heat storage and release component with the salt bath molten salt component, the recovered high-temperature waste heat can be stored in the high-temperature molten salt tank, thereby converting it into a continuous and stable high-quality heat source.

[0022] In addition, by coordinating the low-temperature molten salt tank, high-temperature molten salt tank, heat storage pipeline, heat release pipeline and molten salt heat exchange structure, heat storage and release can be decoupled, ensuring that the system can adjust heat output as needed, solving the problem of intermittent high-temperature waste heat being difficult to continuously utilize, and providing a stable, high-quality heat source.

[0023] In addition, the power generation of the steam turbine in the steam-water component can be flexibly adjusted by controlling the molten salt flow rate. The molten salt flow rate can be increased to increase the power during peak electricity consumption periods, and the molten salt flow rate can be reduced to reduce the power during low electricity consumption periods. This can adapt to changes in the grid load and significantly enhance the flexibility and economy of the system.

[0024] The present invention can convert the high-temperature waste heat from smelting products, which is originally difficult to recover, into a continuous and stable heat source for power generation or industrial heating. It overcomes the problem of temperature fluctuations, achieves stable and controllable output, and can be better applied to industrial scenarios. It has the advantages of efficient recovery, flexible peak regulation, energy saving and consumption reduction, significant economic benefits, outstanding social benefits, high stability and reliability, etc., providing an advanced waste heat recovery solution for the steel industry and other high-temperature industrial fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 these drawings without creative work.

[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0027] Figure 1This is a structural schematic diagram of an embodiment of the molten salt heat storage and peak-shaving system of the present invention.

[0028] Reference numerals in the above drawings:

[0029] 10. Finished product;

[0030] 100. Salt bath molten salt assembly; 110. Molten salt tank; 111. High-temperature molten salt tank; 112. Medium-temperature molten salt tank; 120. Molten salt circulation pipeline; 121. High-temperature molten salt circulation pipeline; 122. Medium-temperature molten salt circulation pipeline; 123. High-temperature molten salt tank circulation pump; 124. Medium-temperature molten salt tank circulation pump;

[0031] 200, molten salt heat storage and release assembly; 210, low-temperature molten salt tank; 220, high-temperature molten salt tank; 230, heat storage pipeline; 231, low-temperature molten salt heat absorption pump; 240, heat release pipeline; 241, heat release pump; 250, molten salt heat exchange structure; 251, medium-temperature molten salt heat exchanger; 252, high-temperature molten salt heat exchanger;

[0032] 300, steam-water assembly; 310, steam turbine; 320, steam-water circulation piping; 321, condenser; 322, feedwater pump; 330, steam generating structure; 331, superheater; 332, evaporator; 333, feedwater preheater; 334, steam drum;

[0033] 400, water cooling assembly; 410, water cooling tank; 420, water cooling circulation pipeline; 421, cooling water circulation pump; 430, cooling water heat exchange structure; 431, cooling water heat exchanger;

[0034] 500, salt drainage pipeline; 501, first inlet; 502, second inlet; 503, third inlet; 510, salt drainage tank; 520, salt drainage pump; 530, heater; 540, agitator. DETAILED DESCRIPTION

[0035] 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 creative efforts are within the scope of protection of the present invention.

[0036] Please refer to Figure 1As shown, an embodiment of the present invention provides a molten salt heat storage and peak-shaving system, which includes a salt bath molten salt component 100, a molten salt heat storage and release component 200, and a steam-water component 300. The salt bath molten salt component 100 includes a plurality of molten salt tanks 110 arranged in sequence along the conveying direction of the smelting product 10, and a plurality of molten salt circulation pipelines 120 for respectively connecting the molten salt tanks 110. The plurality of molten salt tanks 110 are used to cool the smelting product 10 step by step; the molten salt heat storage and release component 200 includes a low-temperature molten salt tank 210, a high-temperature molten salt tank 220, a heat storage pipeline 230 for connecting the low-temperature molten salt tank 210 and the high-temperature molten salt tank 220, and a heat storage pipeline 230 for connecting the low-temperature molten salt tank 210 and the high-temperature molten salt tank 220. A heat release pipeline 240 connects the high-temperature molten salt tank 220 and the low-temperature molten salt tank 210, and a molten salt heat exchange structure 250 is provided between the heat storage pipeline 230 and each molten salt circulation pipeline 120. The molten salt heat exchange structure 250 is used to replace the heat in each molten salt circulation pipeline 120 to the heat storage pipeline 230; the steam-water component 300 includes a steam turbine 310 and a steam-water circulation pipeline 320 for connecting the steam turbine 310. A steam generating structure 330 is provided between the steam-water circulation pipeline 320 and the heat release pipeline 240. The steam generating structure 330 is used to generate saturated steam through the heat in the heat release pipeline 240, and the steam turbine 310 is used to generate electricity through saturated steam.

[0037] On the whole, when the molten salt heat storage and peak-shaving system is used, the salt bath molten salt component 100, the molten salt heat storage and release component 200 and the steam-water component 300 are coordinated to achieve the effective recovery and continuous and stable output of the high-temperature waste heat of the smelting finished product 10. Specifically, by cooling the smelting finished product 10 step by step through the salt bath molten salt component 100, the high-temperature waste heat of the smelting finished product 10 can be effectively recovered, reducing energy waste and overcoming the problem of intermittent transportation of the smelting finished product 10. Molten salt heat storage technology has a high heat storage capacity and thermal stability. By cooperating with the molten salt heat storage and release component 200 and the salt bath molten salt component 100, the recovered high-temperature waste heat can be stored in the high-temperature molten salt tank 220, thereby converting it into a continuous and stable high-quality heat source.

[0038] By coordinating the low-temperature molten salt tank 210, the high-temperature molten salt tank 220, the heat storage pipeline 230, the heat release pipeline 240 and the molten salt heat exchange structure 250, heat storage and release can be decoupled, ensuring that the system adjusts heat output as needed, solving the problem of intermittent high-temperature waste heat being difficult to continuously utilize, and providing a stable, high-quality heat source.

[0039] The power generation of the steam turbine 310 in the steam-water assembly 300 can be flexibly adjusted by controlling the molten salt flow rate. The molten salt flow rate can be increased to increase power during peak power consumption periods, and the molten salt flow rate can be reduced to reduce power during low power consumption periods. This can adapt to changes in the power grid load and significantly enhance the flexibility and economy of the system.

[0040] The present invention can convert the high-temperature waste heat of smelting products 10, which is originally difficult to recover, into a continuous and stable heat source for power generation or industrial heating, overcoming the problem of temperature fluctuations and achieving stable and controllable output. It can be better applied to industrial scenarios and has the advantages of efficient recovery, flexible peak regulation, energy saving and consumption reduction, significant economic benefits, outstanding social benefits, high stability and reliability, etc., providing an advanced waste heat recovery solution for the steel industry and other high-temperature industrial fields.

[0041] In a feasible embodiment of the present invention, the molten salt heat storage and peak-shaving system also includes a water cooling component 400, which includes a water cooling tank 410 arranged downstream of the salt bath molten salt component 100, and a water cooling circulation pipeline 420 for connecting the water cooling tank 410. A cooling water heat exchange structure 430 is provided between the steam-water circulation pipeline 320 and the water cooling circulation pipeline 420. The cooling water heat exchange structure 430 is used to replace the heat in the water cooling circulation pipeline 420 to the steam-water circulation pipeline 320.

[0042] By arranging the water cooling tank 410 downstream of the salt bath molten salt assembly 100, the high-temperature finished product 10 can be finally cooled after being cooled by the molten salt. At the same time, the cooling water in the water cooling circulation pipeline 420 transfers heat to the steam-water circulation pipeline 320 through the cooling water heat exchange structure 430, thereby realizing the reuse of the waste heat of the cooling water. This not only effectively reduces the final temperature of the high-temperature finished product 10 and reduces environmental thermal pollution, but also makes full use of the waste heat resources of the water cooling link, further improving the thermal efficiency and energy utilization rate of the system.

[0043] In a feasible embodiment, the smelted product 10 is first immersed in a high-temperature molten salt tank 111 to initially cool the smelted product 10 to 500°C to 600°C, and then the smelted product 10 is immersed in a medium-temperature molten salt tank 112 to cool the smelted product 10 to about 300°C, and then the smelted product 10 is immersed in a water cooling tank 3 to further cool it to about 50°C.

[0044] Designers can adjust the specific structure of cooling water heat exchange structure 430 based on actual use, and this is not a specific limitation. Preferably, cooling water heat exchange structure 430 includes a cooling water heat exchanger 431 disposed between steam-water circulation pipeline 320 and water-cooling circulation pipeline 420. Water-cooling circulation pipeline 420 communicates with the first heat exchange path of cooling water heat exchanger 431, while steam-water circulation pipeline 320 communicates with the second heat exchange path of cooling water heat exchanger 431.

[0045] In an embodiment of the present invention, Figure 1In the illustrated embodiment, a cooling water circulation pump 421 is provided on the water-cooling circulation pipeline 420. By providing the cooling water circulation pump 421 on the water-cooling circulation pipeline 420, the cooling water circulation pump 421 can actively drive the cooling water to circulate between the water-cooling tank 410 and the cooling water heat exchange structure 430, so that the heat in the water-cooling tank 410 can be more efficiently transferred to the steam-water circulation pipeline 320, thereby improving the overall heat recovery efficiency and operational stability.

[0046] In another feasible embodiment of the present invention, the molten salt heat storage and peak-shaving system also includes a water cooling component 400, which includes an external open cooling pipeline. A cooling water heat exchange structure 430 is provided between the steam-water circulation pipeline 320 and the external open cooling pipeline. The cooling water heat exchange structure 430 is used to replace the heat in the external open cooling pipeline to the steam-water circulation pipeline 320.

[0047] The coordination of the external open cooling line with the steam-water circulation line 320 further expands the heat source acquisition method. The cooling water heat exchange structure 430 can transfer heat from the external open cooling line to the steam-water circulation line 320, thereby fully utilizing the heat energy in the external open cooling line and improving the overall thermal efficiency of the system.

[0048] In addition, the external open cooling pipeline not only enhances the flexibility and adaptability of the system, but also reduces dependence on closed cooling systems, reduces operating costs and complexity, while ensuring the stability and efficiency of the system under different working conditions, and provides a new technical means for achieving all-round energy recovery and utilization.

[0049] In the embodiment of the present invention, the designer may adjust the specific number of molten salt tanks 110 according to usage requirements, and no specific limitation is imposed herein.

[0050] In a feasible embodiment, the multiple molten salt tanks 110 include at least a high-temperature molten salt tank 111 and a medium-temperature molten salt tank 112. Along the conveying direction of the smelted product 10, the high-temperature molten salt tank 111 is arranged upstream of the medium-temperature molten salt tank 112. The multiple molten salt circulation pipelines 120 include at least a high-temperature molten salt circulation pipeline 121 for connecting the high-temperature molten salt tank 111, and a medium-temperature molten salt circulation pipeline 122 for connecting the medium-temperature molten salt tank 112. A high-temperature molten salt circulation pipeline 121 is provided with a high-temperature molten salt tank circulation pump 123, and a medium-temperature molten salt circulation pipeline 122 is provided with a medium-temperature molten salt tank circulation pump 124.

[0051] By setting up a high-temperature molten salt tank 111, a medium-temperature molten salt tank 112 and a corresponding molten salt circulation pipeline 120, and respectively configuring a high-temperature molten salt tank circulation pump 123 and a medium-temperature molten salt tank circulation pump 124 on the high-temperature molten salt circulation pipeline 121 and the medium-temperature molten salt circulation pipeline 122, precise control and efficient circulation of molten salt in different temperature ranges are achieved.

[0052] In addition, the high-temperature molten salt tank 111 and the medium-temperature molten salt tank 112 cooperate to ensure that the high-temperature finished product 10 can be cooled step by step during transportation, and the recovered heat is transferred to the subsequent heat exchange link in a graded manner, thereby maximizing the waste heat utilization efficiency.

[0053] Furthermore, the molten salt heat exchange structure 250 includes a medium-temperature molten salt heat exchanger 251 arranged between the heat storage pipeline 230 and the medium-temperature molten salt circulation pipeline 122, and a high-temperature molten salt heat exchanger 252 arranged between the heat storage pipeline 230 and the high-temperature molten salt circulation pipeline 121.

[0054] The medium-temperature molten salt heat exchanger 251 and the high-temperature molten salt heat exchanger 252 can realize the graded recovery and efficient transfer of molten salt heat in different temperature ranges, thereby accurately matching the thermal energy characteristics of high-temperature and medium-temperature molten salts, ensuring that the high-grade heat in the high-temperature molten salt and the low-grade heat in the medium-temperature molten salt are effectively utilized respectively, thereby maximizing the thermal efficiency of the system.

[0055] In an embodiment of the present invention, a low-temperature molten salt heat absorption pump 231 is provided on the heat storage pipeline 230; and / or a heat release pump 241 is provided on the heat release pipeline 240. Preferably, a low-temperature molten salt heat absorption pump 231 is provided on the heat storage pipeline 230, and a heat release pump 241 is provided on the heat release pipeline 240.

[0056] In a specific embodiment, the low-temperature molten salt heat absorption pump 231 is arranged between the low-temperature molten salt tank 210 and the medium-temperature molten salt heat exchanger 251 , and the heat release pump 241 is arranged between the high-temperature molten salt tank 220 and the superheater 331 .

[0057] By setting a low-temperature molten salt heat absorption pump 231 on the heat storage pipeline 230 and placing it between the low-temperature molten salt tank 210 and the medium-temperature molten salt heat exchanger 251, the low-temperature molten salt heat absorption pump 231 can actively drive the low-temperature molten salt from the low-temperature molten salt tank 210 to the high-temperature molten salt tank 220, thereby realizing forced circulation of the molten salt, effectively overcoming the problem of large natural flow resistance of the low-temperature molten salt, and ensuring that the low-temperature molten salt can fully absorb the heat from the medium-temperature molten salt heat exchanger 251 and the high-temperature molten salt heat exchanger 252, thereby improving the overall heat transfer efficiency and energy utilization.

[0058] The heat release pump 241 can effectively improve the transportation capacity of high-temperature molten salt from the high-temperature molten salt tank 220 to the superheater 331, ensuring that the molten salt flow is stable and controllable. It not only helps to accurately adjust the molten salt flow entering the superheater 331, thereby optimizing the heat transfer efficiency during the steam superheating process, but also can flexibly adjust the power of the turbine 310 according to actual power generation needs, thereby achieving efficient operation and load regulation of the system.

[0059] In an embodiment of the present invention, a condenser 321 and a feed water pump 322 are provided on the steam-water circulation pipeline 320 , and the condenser 321 and the feed water pump 322 are sequentially arranged downstream of the outlet of the steam turbine 310 .

[0060] By providing a condenser 321 and a feed water pump 322 on the steam-water circulation pipeline 320 and arranging them in sequence downstream of the outlet of the steam turbine 310, effective condensation and reuse of the steam working medium is achieved.

[0061] Among them, the condenser 321 can condense the exhaust steam discharged from the turbine 310 into liquid water, reduce its entropy value and recover waste heat, and the water feed pump 322 can re-pressurize the condensed water and send it back to the subsequent pipeline to participate in the subsequent thermal cycle. This not only improves the recycling rate of the working fluid and reduces energy loss, but also ensures the continuity and stability of the entire thermal cycle, thereby significantly improving the overall thermal efficiency and economy of the system.

[0062] In an embodiment of the present invention, the steam generating structure 330 includes a superheater 331, an evaporator 332, a feed water preheater 333 and a steam drum 334. The heat release pipe 240 is connected to the first heat exchange channel of the superheater 331, the first heat exchange channel of the evaporator 332 and the first heat exchange channel of the feed water preheater 333. The steam-water circulation pipe 320 is connected to the second heat exchange channel of the feed water preheater 333, the steam drum 334 and the second heat exchange channel of the superheater 331. The steam drum 334 is connected to the second heat exchange channel of the evaporator 332.

[0063] By installing superheater 331, evaporator 332, feedwater preheater 333, and steam drum 334, and connecting each component of heat release pipeline 240 to the steam-water circulation pipeline 320, efficient heat conversion is achieved. Specifically, the high-temperature medium in heat release pipeline 240 passes through superheater 331, evaporator 332, and feedwater preheater 333 in sequence, releasing heat to heat the working medium in the steam-water circulation pipeline 320. In conjunction with steam drum 334, this sequentially achieves feedwater preheating, saturated steam generation, and superheated steam production. The coordinated operation of superheater 331, evaporator 332, feedwater preheater 333, and steam drum 334 fully utilizes the thermal energy in the molten salt and reduces energy loss.

[0064] Steam drum 334 serves as the core hub of steam generation structure 330, primarily responsible for steam-water separation, fluid storage and distribution, and pressure stabilization. Steam drum 334 receives the saturated steam-water mixture from evaporator 332 and, through internal devices, separates the steam and water. It then delivers pure saturated steam to superheater 331 for further heating, while redistributing unevaporated water back to evaporator 332 for further heating. Furthermore, steam drum 334 has a certain water and steam storage capacity, which can buffer system pressure and flow changes during load fluctuations, ensuring stable operation of the entire system.

[0065] In an embodiment of the present invention, the molten salt heat storage and peak-shaving system also includes a salt diversion pipeline 500 and a salt diversion tank 510 arranged on the salt diversion pipeline 500. The outlet of the salt diversion pipeline 500 is connected to the low-temperature molten salt tank 210, and the inlet of the salt diversion pipeline 500 is used to connect to the heat release pipeline 240.

[0066] The coordination of the salt drainage pipeline 500 and the salt drainage tank 510 effectively solves the problem of molten salt deposition or blockage that may occur during system operation. Specifically, the salt drainage pipeline 500 can guide the deposited molten salt generated in the heat release pipeline 240 due to temperature changes or other reasons to the salt drainage tank 510 for temporary storage or treatment, and then safely return it to the low-temperature molten salt tank 210, ensuring smooth molten salt flow throughout the system. This not only improves the reliability and stability of the system, but also extends the service life of the equipment, while reducing maintenance costs, providing an important guarantee for the efficient and long-term operation of the molten salt heat storage and peak-shaving system.

[0067] In a feasible embodiment, the salt removal pipeline 500 is provided with multiple inlets, namely a first inlet 501, a second inlet 502 and a third inlet 503. The first inlet 501 is located between the superheater 331 and the evaporator 332, the second inlet 502 is located between the evaporator 332 and the feed water preheater 333, and the third inlet 503 is located downstream of the feed water preheater 333.

[0068] By cooperating with the first inlet 501, the second inlet 502 and the third inlet 503, comprehensive coverage and targeted treatment of molten salt deposition problems in different areas of the heat release pipeline 240 are achieved, reducing the system maintenance frequency and improving the system operation reliability.

[0069] Specifically, the first inlet 501 can effectively remove high-temperature molten salt deposits that may be generated between the superheater 331 and the evaporator 332; the second inlet 502 is aimed at the molten salt agglomeration problem caused by temperature changes between the evaporator 332 and the feed water preheater 333; the third inlet 503 further protects the downstream area of ​​the feed water preheater 333.

[0070] Furthermore, a salt drain pump 520 is provided on the salt drain pipe 500, a heater 530 is provided on the salt drain tank 510, and / or an agitator 540 is provided in the salt drain tank 510. Preferably, the salt drain tank 510 is provided with a heater 530, and an agitator 540 is provided in the salt drain tank 510.

[0071] By arranging a salt removal pump 520 on the salt removal pipeline 500 and arranging a heater 530 and an agitator 540 on the salt removal tank 510, the processing efficiency of molten salt deposits and the stability of system operation are significantly improved, the risk of system failure is reduced, and the service life of the equipment is extended.

[0072] Specifically, the salt drainage pump 520 can enhance the flow capacity of the molten salt in the salt drainage pipeline 500, effectively remove sediments and transport it to the salt drainage tank 510; at the same time, the heater 530 on the salt drainage tank 510 can prevent the molten salt from solidifying due to temperature reduction, ensuring that it is in a suitable working state, and the agitator 540 can further evenly mix the molten salt to avoid the occurrence of local agglomeration.

[0073] In a feasible embodiment of the present invention, the working steps of the molten salt heat storage peak regulation system are as follows:

[0074] The high-temperature finished product 10 is first immersed in a high-temperature molten salt tank 111 for preliminary cooling to 500°C-600°C, then moved to a medium-temperature molten salt tank 112 for further cooling to 300°C, and finally immersed in a cooling water tank to cool to 50°C.

[0075] The low-temperature molten salt in the low-temperature molten salt tank 210 is transported by the low-temperature molten salt heat absorption pump 231, and is heated to about 560°C by the medium-temperature molten salt heat exchanger 251 and the high-temperature molten salt heat exchanger 252 in turn, and then flows into the high-temperature molten salt tank 220 for storage, completing the heat storage process.

[0076] The high-temperature molten salt in the high-temperature molten salt tank 220 is driven by the heat release pump 241, flows through the molten salt steam superheater 331, the molten salt steam-water evaporator 332 and the molten salt feed water preheater 333 in sequence to release heat, and then flows into the low-temperature molten salt tank 210, completing the heat release process.

[0077] The condensate is fed by the feedwater pump 322 to the cooling water heat exchanger 431, where it exchanges heat with the cooling water in the water-cooling tank 410 to increase its temperature. It then enters the feedwater preheater 333, where it exchanges heat with the high-temperature molten salt, before being fed to the steam drum 334. The boiler water in the steam drum 334 exchanges heat with the molten salt in the evaporator 332 to produce saturated steam. After steam-water separation in the steam drum 334, the condensate enters the superheater 331, where it absorbs heat from the molten salt to become superheated steam. This steam then enters the steam turbine 310 to generate electricity. After performing work, the steam enters the condenser 321, condensing into condensate to be supplied to the next steam cycle.

[0078] The molten salt in the high-temperature molten salt tank 111 is driven by the high-temperature molten salt tank circulation pump 123, releases heat in the high-temperature molten salt heat exchanger 252, and then returns to the high-temperature molten salt tank 111 to maintain a stable temperature; the molten salt in the medium-temperature molten salt tank 112 is driven by the medium-temperature molten salt tank circulation pump 124, releases heat in the medium-temperature molten salt heat exchanger 251, and then returns to the medium-temperature molten salt tank 112 to maintain a stable temperature; the cooling water in the water-cooling tank 410 is driven by the cooling water circulation pump 421, and exchanges heat with the feed water in the cooling water heat exchanger 431 to maintain a stable cooling water temperature.

[0079] The power generation of the steam turbine 310 is achieved by adjusting the molten salt flow delivered by the heat release pump 241 to realize the heat storage peak regulation function. During the peak power consumption period, the molten salt flow is increased to increase the superheated steam production, thereby increasing the power of the steam turbine generator set, while during the low power consumption period, the molten salt flow is reduced to reduce the superheated steam production, thereby reducing the power of the steam turbine generator set.

[0080] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "essentially consisting of..." describing a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps herein also contemplates an embodiment that is essentially composed of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any attribute described that "may" include is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0081] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A molten salt heat storage peak regulation system, characterized in that: include: A salt bath molten salt assembly, comprising a plurality of molten salt tanks arranged in sequence along the conveying direction of the smelted product, and a plurality of molten salt circulation pipelines for respectively connecting the molten salt tanks, wherein the plurality of molten salt tanks are used to cool the smelted product step by step; A molten salt heat storage and release component, comprising a low-temperature molten salt tank, a high-temperature molten salt tank, a heat storage pipeline for connecting the low-temperature molten salt tank and the high-temperature molten salt tank, and a heat release pipeline for connecting the high-temperature molten salt tank and the low-temperature molten salt tank. A molten salt heat exchange structure is provided between the heat storage pipeline and each of the molten salt circulation pipelines, and the molten salt heat exchange structure is used to replace the heat in each of the molten salt circulation pipelines into the heat storage pipeline; A steam-water component includes a steam turbine and a steam-water circulation pipeline for connecting the steam turbine. A steam generating structure is provided between the steam-water circulation pipeline and the heat release pipeline. The steam generating structure is used to generate saturated steam through the heat in the heat release pipeline. The steam turbine is used to generate electricity through saturated steam.

2. The molten salt heat storage peak regulation system according to claim 1, characterized in that: The molten salt heat storage and peak-shaving system also includes a water cooling component, which includes a water cooling tank arranged downstream of the salt bath molten salt component and a water cooling circulation pipeline for connecting the water cooling tank. A cooling water heat exchange structure is provided between the steam-water circulation pipeline and the water cooling circulation pipeline. The cooling water heat exchange structure is used to replace the heat in the water cooling circulation pipeline to the steam-water circulation pipeline.

3. The molten salt heat storage peak regulation system according to claim 2, characterized in that: The cooling water heat exchange structure includes a cooling water heat exchanger arranged between the steam-water circulation pipeline and the water-cooling circulation pipeline.

4. The molten salt heat storage peak regulation system according to claim 2, characterized in that: A cooling water circulation pump is provided on the water cooling circulation pipeline.

5. The molten salt heat storage peak regulation system according to claim 1, characterized in that: The molten salt heat storage and peak-shaving system also includes a water cooling component, which includes an external open cooling pipeline. A cooling water heat exchange structure is provided between the steam-water circulation pipeline and the external open cooling pipeline. The cooling water heat exchange structure is used to replace the heat in the external open cooling pipeline to the steam-water circulation pipeline.

6. The molten salt heat storage peak regulation system according to claim 1, characterized in that: The multiple molten salt tanks include at least a high-temperature molten salt tank and a medium-temperature molten salt tank. Along the transportation direction of the smelted products, the high-temperature molten salt tank is arranged upstream of the medium-temperature molten salt tank. The multiple molten salt circulation pipelines include at least a high-temperature molten salt circulation pipeline for connecting the high-temperature molten salt tank and a medium-temperature molten salt circulation pipeline for connecting the medium-temperature molten salt tank. The high-temperature molten salt circulation pipeline is provided with a high-temperature molten salt tank circulation pump, and the medium-temperature molten salt circulation pipeline is provided with a medium-temperature molten salt tank circulation pump.

7. The molten salt heat storage peak regulation system according to claim 6, characterized in that: The molten salt heat exchange structure includes a medium-temperature molten salt heat exchanger arranged between the heat storage pipeline and the medium-temperature molten salt circulation pipeline, and a high-temperature molten salt heat exchanger arranged between the heat storage pipeline and the high-temperature molten salt circulation pipeline.

8. The molten salt heat storage peak regulation system according to claim 1, characterized in that: The heat storage pipeline is provided with a low-temperature molten salt heat absorption pump; and / or the heat release pipeline is provided with a heat release pump.

9. The molten salt heat storage peak regulation system according to claim 1, characterized in that: A condenser and a feed water pump are provided on the steam-water circulation pipeline, and the condenser and the feed water pump are sequentially arranged downstream of the steam turbine.

10. The molten salt heat storage peak regulation system according to claim 1, characterized in that: The steam generating structure includes a superheater, an evaporator, a feed water preheater and a steam drum. The heat release pipeline is connected to the first heat exchange channel of the superheater, the first heat exchange channel of the evaporator and the first heat exchange channel of the feed water preheater. The steam-water circulation pipeline is connected to the second heat exchange channel of the feed water preheater, the steam drum and the second heat exchange channel of the superheater. The steam drum is connected to the second heat exchange channel of the evaporator.

11. The molten salt heat storage peak regulation system according to claim 10, characterized in that: The molten salt heat storage and peak-shaving system also includes a salt diversion pipeline and a salt diversion tank arranged on the salt diversion pipeline. The outlet of the salt diversion pipeline is connected to the low-temperature molten salt tank, and the inlet of the salt diversion pipeline is used to connect to the heat release pipeline.

12. The molten salt heat storage peak regulation system according to claim 11, characterized in that: The desalting pipeline is provided with multiple inlets, namely a first inlet, a second inlet and a third inlet. The first inlet is located between the superheater and the evaporator, the second inlet is located between the evaporator and the feed water preheater, and the third inlet is located downstream of the feed water preheater.

13. The molten salt heat storage peak regulation system according to claim 11, characterized in that: The salt drainage pipeline is provided with a salt drainage pump, the salt drainage tank is provided with a heater and / or the salt drainage tank is provided with a stirrer.

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