A system for recovering high temperature workpiece waste heat with a molten salt energy reactor and method of use

Abstract

The application discloses a system and a use method for recycling waste heat of high-temperature workpieces by using a molten salt energy pile, and belongs to the field of energy saving and emission reduction. The system comprises a softened water treatment system, a heat exchange system, a molten salt energy storage system, a high-temperature workpiece cooling and heat collecting system and a power generation system. The high-temperature workpiece cooling and heat collecting system comprises a fan, a cooling and heat collecting cavity and a densely arranged water-cooled pipe type conveying belt. An air duct is arranged at the upper portion of the cooling and heat collecting cavity, an air outlet of the fan is connected with an input end of the air duct, and an output end of the air duct is connected with an air inlet of a first energy converter of the heat exchange system. The densely arranged water-cooled pipe type conveying belt is located below the air duct of the cooling and heat collecting cavity, the high-temperature workpieces are transported by the densely arranged water-cooled pipe type conveying belt and pass through the cooling and heat collecting cavity, and the transporting direction is opposite to the air direction of the fan. The system realizes the recycling of waste heat of high-temperature workpieces, converts solar energy into heat energy by using the molten salt energy storage system, stores the heat energy in the high-temperature molten salt energy pile, organically combines the waste heat of high-temperature workpieces and solar light heat, improves the power generation capacity of the system, and realizes energy saving and emission reduction.

Description

Technical Field

[0001] This invention belongs to the field of molten salt energy storage technology, specifically relating to a system and method for recovering waste heat from high-temperature workpieces using molten salt energy stacks. Background Technology

[0002] In recent years, with the rapid development of industry and the large-scale use of non-renewable energy, a global energy crisis and environmental pollution have been caused, making energy conservation and emission reduction a major concern. The forging industry, as a major energy consumer, suffers from energy loss while forging castings. Significant energy loss occurs when formed castings are awaiting cooling. Existing cooling methods for castings have the following defects: 1) In most cases, castings are placed in air for natural cooling, with the temperature dropping from 900℃ to 100℃, a temperature drop of up to 800℃. The maximum heat released by cooling a single casting can reach 67347KJ, equivalent to approximately 18KWh. Natural cooling will result in severe heat loss; 2) A small number use direct air blowing for cooling, which can cause localized overcooling of the casting, leading to changes in its properties or strength, and consequently, quality defects.

[0003] In summary, the heat carried by high-temperature workpieces or objects undoubtedly has great potential for energy saving. In order to better achieve energy conservation and emission reduction, this invention designs a system for recovering waste heat from high-temperature workpieces using a molten salt energy stack. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the technical problem this invention aims to solve is to provide a system and method for recovering waste heat from high-temperature workpieces using a molten salt energy stack. This system achieves waste heat recovery from high-temperature workpieces by converting solar energy into thermal energy and storing it in a high-temperature molten salt energy stack through molten salt energy storage. This organically combines the waste heat from high-temperature workpieces with solar thermal energy, improving the system's power generation capacity and achieving energy conservation and emission reduction.

[0005] The technical solution adopted by the present invention to solve the aforementioned technical problem is as follows:

[0006] This invention provides a system for recovering waste heat from high-temperature workpieces using a molten salt energy stack, comprising a softened water treatment system, a heat exchange system, a molten salt energy storage system, a high-temperature workpiece cooling and heat collection system, and a power generation system; the heat exchange system includes a primary energy converter, a secondary energy converter, and a tertiary energy converter; the molten salt energy storage system includes a high-temperature molten salt energy stack, a low-temperature molten salt energy stack, a solar thermal collector field, a heat collection pump group, a cold salt pump group, and a hot salt pump group; the high-temperature workpiece cooling and heat collection system includes a fan, a cooling and heat collection chamber, and a closed-loop water-cooled pipe conveyor belt;

[0007] The feedwater inlet of the first-stage energy converter is connected to the output of the softened water treatment system. The feedwater outlet of the first-stage energy converter is connected to the inlet of the second-stage energy converter and the low-temperature energy stack, respectively. A regulating valve is installed between the first-stage and second-stage energy converters, and a regulating valve is installed between the first-stage and low-temperature energy stack. The steam outlet of the second-stage energy converter is connected to the steam inlet of the third-stage energy converter, and the steam outlet of the third-stage energy converter is connected to the power generation system. The molten salt inlet of the second-stage energy converter is connected to the molten salt outlet of the third-stage energy converter, and the molten salt outlet of the second-stage energy converter is connected to the molten salt inlet of the low-temperature molten salt energy stack. The molten salt outlet of the low-temperature molten salt energy stack is connected to the cold salt inlet of the high-temperature molten salt energy stack through a cold salt pump set. The cold salt outlet of the high-temperature molten salt energy stack is connected to the inlet of the solar collector field through a heat collector pump set. The outlet of the solar collector field is connected to the hot salt inlet of the high-temperature molten salt energy stack. The hot salt outlet of the high-temperature molten salt energy stack is connected to the molten salt inlet of the third-stage energy converter through a molten salt pipeline and a hot salt pump set.

[0008] The upper part of the cooling heat collection cavity is equipped with an air duct. The air outlet of the fan is connected to the input end of the air duct, and the output end of the air duct is connected to the air inlet of the first-stage energy converter. The dense drainage cooling pipe type conveyor belt is located below the air duct of the cooling heat collection cavity. The high-temperature workpiece is transported by the dense drainage cooling pipe type conveyor belt and passes through the cooling heat collection cavity. The transport direction is opposite to the airflow direction of the fan.

[0009] Furthermore, the power generation system includes a turbine unit and a generator; the steam outlet of the three-stage energy converter is connected to the turbine unit, and the turbine unit is connected to the generator.

[0010] Furthermore, the softened water treatment system includes resin tanks, a vacuum deoxygenation device, and a water supply pump set; multiple resin tanks are connected to the input end of the vacuum deoxygenation device, and the output end of the vacuum deoxygenation device is connected to the water supply inlet of the primary energy converter through the water supply pump set.

[0011] This invention also provides a method for using a system that utilizes a molten salt energy stack to recover waste heat from high-temperature workpieces, comprising the following:

[0012] When the high-temperature workpiece cooling heat collection system no longer provides heat, and solar energy becomes the effective heat source, regulating valve one is opened and regulating valve two is closed. The deoxygenated water generated by the softened water treatment system is transported through the primary energy converter and enters the secondary energy converter, where it exchanges heat with the high-temperature molten salt to generate saturated steam. The low-temperature molten salt after heat exchange in the secondary energy converter enters the low-temperature molten salt energy stack, and after being pressurized by the cold salt pump group, it enters the high-temperature molten salt energy stack for preheating. The preheated low-temperature molten salt is pressurized by the heat collection pump group and enters the solar collector field. The solar collector field collects solar energy to heat the low-temperature molten salt, obtaining high-temperature molten salt. The high-temperature molten salt is transported to the high-temperature molten salt energy stack for storage. The saturated steam generated by the secondary energy converter enters the tertiary energy converter and exchanges heat with the high-temperature molten salt to generate superheated steam. The power generation system uses the superheated steam to generate electricity, and the low-pressure exhaust gas generated by the power generation system is used for heating users and / or by lithium bromide refrigeration units.

[0013] When the molten salt energy storage system no longer provides heat, and the waste heat from the high-temperature workpiece becomes the effective heat source, regulating valve one is closed and regulating valve two is opened; the high-temperature workpiece is transported through the cooling heat collection chamber via a densely drained cooling pipe conveyor belt, transferring heat to the wall of the cooling heat collection chamber duct; under the action of the fan, cold air enters the duct at the top of the cooling heat collection chamber, and the cold air absorbs the heat from the duct wall to generate hot air. The hot air enters the primary energy converter and exchanges heat with the deoxygenated water generated by the softened water treatment system. The deoxygenated water after heat exchange enters the low-temperature energy stack for utilization.

[0014] When solar energy and waste heat from high-temperature workpieces serve as effective heat sources, regulating valve one is opened and regulating valve two is closed. The high-temperature workpiece is transported through the cooling and heat collection chamber via a densely packed, refrigerated conveyor belt, transferring heat to the walls of the cooling and heat collection chamber's ductwork. Under the action of a fan, cold air enters the upper ductwork of the cooling and heat collection chamber, absorbing heat from the ductwork walls to generate hot air. The hot air enters the primary energy converter, exchanging heat with the deoxygenated water entering the primary energy converter. The deoxygenated water then enters the secondary energy converter, exchanging heat with the high-temperature molten salt in the secondary energy converter to generate saturated steam. The secondary energy converter... After heat exchange, the low-temperature molten salt enters the low-temperature molten salt energy stack. After being pressurized by the cold salt pump unit, it enters the high-temperature molten salt energy stack for preheating. The preheated low-temperature molten salt is then pressurized by the heat collector pump unit and enters the solar collector field. The solar collector field heats the low-temperature molten salt by collecting solar energy to obtain high-temperature molten salt. The high-temperature molten salt is transported to the high-temperature molten salt energy stack for storage. The saturated steam generated by the secondary energy converter enters the tertiary energy converter and exchanges heat with the high-temperature molten salt to generate superheated steam. The power generation system uses the superheated steam to generate electricity, and the low-pressure exhaust gas generated by the power generation system is used for heating users and / or lithium bromide refrigeration units.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) To fully recover the waste heat from high-temperature workpieces, a high-temperature workpiece cooling and heat collection system was designed. A separate air duct is installed at the top of the cooling and heat collection chamber to prevent cold air from directly blowing onto the high-temperature workpiece, thus ensuring the workpiece's quality. The waste heat from the high-temperature workpiece is conducted to the duct wall via thermal radiation. The duct wall heats the cold air in the duct, and the hot air undergoes heat exchange in a primary energy converter, achieving the recovery of waste heat from the high-temperature workpiece. The recoverable temperature range for the high-temperature workpiece is 900℃→100℃, with a temperature drop of up to 800℃. A single high-temperature workpiece can recover 67347 kJ of waste heat, equivalent to approximately 18 kWh, effectively solving the problem of severe energy waste in traditional processes.

[0017] (2) Energy saving and emission reduction, and enhanced power generation capacity. High-temperature workpiece waste heat and solar energy serve as effective heat sources. Through molten salt energy storage technology, the captured high-temperature heat is stored in a high-temperature molten salt energy stack. The generated high-grade superheated steam is used for power generation and heating, and can also be used to drive lithium bromide refrigeration units to achieve a cooling effect, achieving a combined cooling, heating and power (CCHP) effect. The energy output forms are diversified, achieving the goal of energy saving and emission reduction. In addition, the organic combination of high-temperature workpiece waste heat and solar thermal energy improves the power generation capacity of the system. Compared with traditional solar thermal and photovoltaic energy, the power generation capacity is increased by more than 20%.

[0018] (3) The high-temperature workpiece cooling heat collection system overcomes the shortcomings of existing technologies, maximizing the recovery of workpiece waste heat while ensuring workpiece strength. It can meet the workpiece cooling process requirements while recovering high-temperature workpiece waste heat. The high-temperature workpiece cooling heat collection system has many advantages, such as fewer moving parts, safe and stable operation, high degree of automation, and low energy consumption.

[0019] (4) Reduce the industrial electricity consumption of foundry enterprises and increase the proportion of green and clean energy electricity use. In particular, green electricity can be used during peak hours during the day to reduce casting costs. It is estimated that the unit casting production cost can be reduced by 5% after waste heat recovery. In addition, carbon reduction effect can also be achieved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the system of the present invention;

[0021] Figure 2 yes Figure 1 Sectional view of AA;

[0022] Figure 3 This is a schematic diagram of the principle of the system of the present invention, which uses solar energy as an effective heat source;

[0023] Figure 4 This is a schematic diagram of the principle of the system of the present invention, which uses the waste heat of high-temperature workpieces as an effective heat source;

[0024] In the diagram, 10 is the water softening system; 20 is the heat exchange system; 30 is the molten salt energy storage system; 40 is the high-temperature workpiece cooling and heat collection system; 50 is the power generation system; and 60 is the cryogenic energy stack.

[0025] 11. Resin tank; 12. Vacuum deaerator; 13. Feed water pump set; 21. Primary energy converter; 22. Secondary energy converter; 23. Tertiary energy converter; 24. Regulating valve one; 25. Regulating valve two; 31. High-temperature molten salt energy stack; 32. Low-temperature molten salt energy stack; 33. Solar thermal collector field; 34. Heat pump set; 35. Cold salt pump set; 36. Hot salt pump set; 41. Fan; 42. Cooling heat collection chamber; 43. Dense drainage cold pipe conveyor belt; 51. Turbine unit; 52. Generator. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings. Specific embodiments are only used to further illustrate the present invention in detail and do not limit the scope of protection of this application.

[0027] This invention provides a system for recovering waste heat from high-temperature workpieces using a molten salt energy stack (see [link]). Figure 1-4 The system includes a water softening system 10, a heat exchange system 20, a molten salt energy storage system 30, a high-temperature workpiece cooling heat collection system 40, and a power generation system 50.

[0028] The heat exchange system 20 includes a primary energy converter 21, a secondary energy converter 22, and a tertiary energy converter 23; the molten salt energy storage system 30 includes a high-temperature molten salt energy stack 31, a low-temperature molten salt energy stack 32, a solar collector field 33, a heat pump group 34, a cold salt pump group 35, and a hot salt pump group 36.

[0029] The water inlet of the primary energy converter 21 is connected to the output of the softened water treatment system 10. The water outlet of the primary energy converter 21 is connected to the inlet of the secondary energy converter 22 and the cryogenic energy stack 60 via water supply pipes. A regulating valve 1 24 is installed on the water supply pipe connecting the primary energy converter 21 and the secondary energy converter 22, and a regulating valve 25 is installed on the water supply pipe connecting the primary energy converter 21 and the cryogenic energy stack 60. Regulating valves 1 24 and 2 25 are used to control the on / off state of their respective pipes. The steam outlet of the secondary energy converter 22 is connected to the steam inlet of the tertiary energy converter 23 via a steam pipe. The steam outlet of the tertiary energy converter 23 is connected to the power generation system 50, which converts thermal energy into... The molten salt inlet of the secondary energy converter 22 is connected to the molten salt outlet of the tertiary energy converter 23 through a molten salt pipe. The molten salt outlet of the secondary energy converter 22 is connected to the molten salt inlet of the low-temperature molten salt energy stack 32 through a molten salt pipe. The molten salt outlet of the low-temperature molten salt energy stack 32 is connected to the cold salt inlet of the high-temperature molten salt energy stack 31 through a cold salt pump group 35. The cold salt outlet of the high-temperature molten salt energy stack 31 is connected to the inlet of the solar collector field 33 through a molten salt pipe and a heat collector pump group 34. The outlet of the solar collector field 33 is connected to the hot salt inlet of the high-temperature molten salt energy stack 31 through a molten salt pipe. The hot salt outlet of the high-temperature molten salt energy stack 31 is connected to the molten salt inlet of the tertiary energy converter 23 through a molten salt pipe and a hot salt pump group 36.

[0030] The deoxygenated water generated by the softened water treatment system 10 enters the secondary energy converter 22 through the primary energy converter 21, where it exchanges heat with the high-temperature molten salt in the secondary energy converter 22 to generate saturated steam. The saturated steam enters the tertiary energy converter 23 to further exchange heat with the high-temperature molten salt from the high-temperature molten salt energy stack 31, generating superheated steam. The superheated steam enters the power generation system 50 as the energy source for the power generation system 50. The low-temperature molten salt after heat exchange in the secondary energy converter 22 enters the low-temperature molten salt energy stack 32, and after being pressurized by the cold salt pump group 35, it enters the high-temperature molten salt energy stack 31 for preheating. The preheated low-temperature molten salt enters the solar collector field 33 through the heat collector pump group 34. The solar collector field 33 heats the low-temperature molten salt by collecting solar energy to obtain high-temperature molten salt. The high-temperature molten salt is stored in the high-temperature molten salt energy stack 31 and enters the tertiary energy converter 23 through the hot salt pump group 36 to heat the saturated steam.

[0031] The high-temperature workpiece cooling and heat collection system 40 includes a fan 41, a cooling and heat collection chamber 42, and a densely packed, water-cooled pipe conveyor belt 43. An air duct is provided at the top of the cooling and heat collection chamber 42. The air outlet of the fan 41 is securely connected to the input end of the air duct, and the output end of the air duct is securely connected to the air inlet at the bottom of the primary energy converter 21. The densely packed, water-cooled pipe conveyor belt 43 is located inside the cooling and heat collection chamber 42 and directly below the air duct; the two are arranged parallel to each other. The cooling and heat collection chamber 42 uses cold air as the heat exchange medium to absorb the heat from the high-temperature workpiece caused by radiative heat transfer on the air duct wall. To enhance the radiative heat transfer effect, the lower wall of the air duct in the cooling and heat collection chamber 42, adjacent to the high-temperature workpiece, is coated with a high-temperature resistant coating. The heat-absorbing coating is composed of a solid solution blackbody radiation material formed by high-temperature doping of transition metal oxides and zirconate refractory materials, and a high-temperature resistant binder, which makes the heat absorption efficiency of the cooling heat collection cavity 42 higher. The cooling heat collection cavity 42 is made of aluminum material and is covered with an insulation layer, which reduces heat loss during transportation while ensuring good thermal conductivity. The dense drainage cooling pipe type conveyor belt 43 is in direct contact with the high-temperature workpiece and directly recovers the high-temperature waste heat of the workpiece through heat conduction. The dense drainage cooling pipe type conveyor belt 43 has a frequency adjustment function, and the speed can be set according to the cooling time of the workpiece. The movement direction of the high-temperature workpiece on the conveyor belt is opposite to the flow direction of the cold air blown out from the fan 41.

[0032] The power generation system 50 includes a turbine unit 51 and a generator 52. The steam outlet of the three-stage energy converter 23 is connected to the turbine unit 51 through a superheated steam pipeline. The superheated steam generated by the three-stage energy converter 23 enters the turbine unit 51. The turbine unit 51 performs work to convert the thermal energy of the superheated steam into mechanical energy, which drives the generator 52 to generate electricity. The low-pressure exhaust gas generated by the turbine unit 51 is supplied to the application end, including heat users, lithium bromide refrigeration units, etc.

[0033] The softened water treatment system 10 includes a resin tank 11, a vacuum deoxygenation device 12, and a water supply pump set 13. Multiple resin tanks 11 are connected to the input end of the vacuum deoxygenation device 12 through water supply pipes. Each resin tank 11 is supplied with tap water, which is deionized in the resin tank 11 to obtain softened water. The output end of the vacuum deoxygenation device 12 is connected to the water supply inlet of the primary energy converter 21 through water supply pipes and the water supply pump set 13. The softened water undergoes deoxygenation treatment by the vacuum deoxygenation device 12 to obtain deoxygenated water.

[0034] The outer surface of the molten salt pipelines is treated with anti-condensation heat tracing and insulation to prevent the molten salt from solidifying in the pipelines due to temperature drops during long-term operation. The solar thermal collector field 33 consists of multiple solar collectors used to collect solar energy to heat the molten salt, and the solar collectors can be flexibly arranged according to the available area on site. The water supply pump group 13, the heat collection pump group 34, the cold salt pump group 35, and the hot salt pump group 36 are all composed of multiple water pumps; the primary energy converter 21, the secondary energy converter 22, and the tertiary energy converter 23 are all heat exchangers.

[0035] This invention also provides a method for using a system that utilizes a molten salt energy stack to recover waste heat from high-temperature workpieces, comprising the following:

[0036] When the high-temperature workpiece cooling heat collection system 40 no longer provides heat, and solar energy becomes the effective heat source, the primary energy converter 21 acts as a pipeline, primarily serving a transport function. This involves opening regulating valve 1 24 and closing regulating valve 25. Figure 3 As shown, tap water is deionized in resin tank 11 to generate softened water. The softened water enters vacuum deoxygenation device 12 for deoxygenation. After being pressurized by water supply pump group 13, the deoxygenated water is transported through primary energy converter 21 and then enters secondary energy converter 22, where it exchanges heat with high-temperature molten salt to generate saturated steam. The low-temperature molten salt after heat exchange in secondary energy converter 22 enters low-temperature molten salt energy stack 32, and after being pressurized by cold salt pump group 35, it enters high-temperature molten salt energy stack 31 for preheating. The preheated low-temperature molten salt is pressurized by heat collector pump group 34 and then enters solar collector field 33. 33 collects solar energy to heat low-temperature molten salt to obtain high-temperature molten salt; the high-temperature molten salt is transported to the high-temperature molten salt energy stack 31 for storage; the saturated steam generated by the secondary energy converter 22 enters the tertiary energy converter 23, and further exchanges heat with the high-temperature molten salt from the high-temperature molten salt energy stack 31 to generate superheated steam that meets the requirements for the operation of the turbine unit 51; the turbine unit 51 performs work to convert the thermal energy of the superheated steam into mechanical energy, driving the generator 52 to generate electricity; the exhaust gas discharged by the turbine unit 51 is discharged in the form of low-pressure exhaust gas, and is transported through pipelines for heating users and / or cooling of lithium bromide refrigeration units.

[0037] When the molten salt energy storage system 30 no longer provides heat, and the waste heat from the high-temperature workpiece becomes the effective heat source, close regulating valve 24 and open regulating valve 25; Figure 4As shown, tap water is deionized in resin tank 11 to generate softened water. The softened water enters vacuum deoxygenation device 12 for deoxygenation. After being pressurized by water supply pump group 13, the deoxygenated water enters the first-stage energy converter 21 to exchange heat with the waste heat collected by the high-temperature workpiece cooling heat collection system 40. The high-temperature workpiece is transported through the cooling heat collection chamber 42 by a dense drainage cooling pipe type conveyor belt 43. The high-temperature workpiece transfers heat to the air duct wall of the cooling heat collection chamber 42 in the form of radiation heat exchange. Under the action of fan 41, cold air enters the cooling chamber. In the upper part of the heat collection cavity 42, the cold air absorbs heat from the duct wall, thereby raising its own temperature and obtaining hot air. The cold air moves in the opposite direction to the high-temperature workpiece. The hot air enters the primary energy converter 21 and exchanges heat with the deoxygenated water through the shell side of the primary energy converter 21. The deoxygenated water after heat exchange is transported into the low-temperature energy stack 60 through the tube side and water supply pipeline of the primary energy converter 21 for hot water use. The hot air that has completed heat exchange in the primary energy converter 21 can re-enter the fan 41 for recycling.

[0038] When solar energy and waste heat from high-temperature workpieces work together as effective heat sources, open regulating valve 24 and close regulating valve 25; (e.g.) Figure 1As shown, tap water is deionized in resin tank 11 to generate softened water. The softened water enters vacuum deoxygenation device 12 for deoxygenation. After being pressurized by water supply pump group 13, the deoxygenated water enters the first-stage energy converter 21 to exchange heat with the waste heat collected by the high-temperature workpiece cooling heat collection system 40. The high-temperature workpiece is transported through the cooling heat collection chamber 42 by a dense water-cooled pipe conveyor belt 43. The high-temperature workpiece transfers heat to the duct wall of the cooling heat collection chamber 42 in the form of radiation heat exchange. Under the action of fan 41, cold air enters the duct at the top of the cooling heat collection chamber 42. The cold air absorbs heat from the duct wall, thereby increasing its own temperature and becoming hot air. The cold air moves in the opposite direction to the high-temperature workpiece. The hot air enters the first-stage energy converter 21 and exchanges heat with the deoxygenated water through the shell side of the first-stage energy converter 21. The hot air after heat exchange can be recycled by re-entering fan 41. The deoxygenated water after heat exchange is transported through the tube side and water supply pipeline of the first-stage energy converter 21 to the second-stage energy converter 22, where it exchanges heat with the second-stage energy collector. The high-temperature molten salt in the energy converter 22 undergoes heat exchange to generate saturated steam. The low-temperature molten salt after heat exchange in the secondary energy converter 22 enters the low-temperature molten salt energy stack 32, and after being pressurized by the cold salt pump group 35, it enters the high-temperature molten salt energy stack 31 for preheating. The preheated low-temperature molten salt is pressurized by the heat collector pump group 34 and enters the solar collector field 33. The solar collector field 33 heats the low-temperature molten salt by collecting solar energy to obtain high-temperature molten salt. The high-temperature molten salt is transported to the high-temperature molten salt energy stack 31 for storage. The saturated steam generated by the secondary energy converter 22 enters the tertiary energy converter 23, where it further exchanges heat with the high-temperature molten salt from the high-temperature molten salt energy stack 31 to generate superheated steam that meets the operating requirements of the turbine unit 51. The turbine unit 51 performs work to convert the thermal energy of the superheated steam into mechanical energy, driving the generator 52 to generate electricity. The exhaust gas discharged by the turbine unit 51 is discharged in the form of low-pressure exhaust gas and transported through pipelines for heating users and / or cooling by lithium bromide refrigeration units.

[0039] Any aspects not covered in this invention are applicable to existing technologies.

Claims

1. A system for recovering high-temperature workpiece waste heat using a molten salt energy reactor, comprising a softened water treatment system, a heat exchange system, a molten salt energy storage system, a high-temperature workpiece cooling and heat collection system, and a power generation system; characterized in that, The heat exchange system comprises a first energy converter, a second energy converter and a third energy converter; the molten salt energy storage system comprises a high-temperature molten salt energy stack, a low-temperature molten salt energy stack, a solar heat collection field, a heat collection pump group, a cold salt pump group and a hot salt pump group; and the high-temperature workpiece cooling heat collection system comprises a fan, a cooling heat collection cavity and a densely arranged water-cooled pipe type conveying belt. The water inlet of the first energy converter is connected with the output end of the softened water treatment system, the water outlet of the first energy converter is connected with the water inlet of the second energy converter and the low-temperature energy stack respectively, an adjusting valve one is arranged between the first energy converter and the second energy converter, and an adjusting valve two is arranged between the first energy converter and the low-temperature energy stack; the steam outlet of the second energy converter is connected with the steam inlet of the third energy converter, and the steam outlet of the third energy converter is connected with a power generation system; the molten salt inlet of the second energy converter is connected with the molten salt outlet of the third energy converter, the molten salt outlet of the second energy converter is connected with the molten salt inlet of the low-temperature molten salt energy stack, the molten salt outlet of the low-temperature molten salt energy stack is connected with the cold salt inlet of the high-temperature molten salt energy stack through the cold salt pump group, the cold salt outlet of the high-temperature molten salt energy stack is connected with the inlet of the solar heat collection field through the heat collection pump group, the outlet of the solar heat collection field is connected with the hot salt inlet of the high-temperature molten salt energy stack, and the hot salt outlet of the high-temperature molten salt energy stack is connected with the molten salt inlet of the third energy converter through the molten salt pipeline and the hot salt pump group; The upper portion of the cooling heat collection cavity is provided with an air duct, the air outlet of the fan is connected with the input end of the air duct, and the output end of the air duct is connected with the air inlet of the first energy converter; the densely arranged water-cooled pipe type conveying belt is located below the air duct of the cooling heat collection cavity, the high-temperature workpiece is transported by the densely arranged water-cooled pipe type conveying belt and passes through the cooling heat collection cavity, and the transportation direction is opposite to the air direction of the fan; When the high-temperature workpiece cooling heat collection system no longer provides heat and the solar energy is an effective heat source, the adjusting valve one is opened and the adjusting valve two is closed; the deaerated water generated by the softened water treatment system is transported through the first energy converter and then enters the second energy converter, exchanges heat with the high-temperature molten salt in the second energy converter, and generates saturated steam; The low-temperature molten salt after heat exchange in the second energy converter enters the low-temperature molten salt energy stack, is pressurized by the cold salt pump group and then enters the high-temperature molten salt energy stack for preheating, the low-temperature molten salt after preheating is pressurized by the heat collection pump group and then enters the solar heat collection field, the solar heat collection field heats the low-temperature molten salt by collecting solar energy, and high-temperature molten salt is obtained; The high-temperature molten salt is transported to the high-temperature molten salt energy stack for storage; the saturated steam generated by the second energy converter enters the third energy converter, exchanges heat with the high-temperature molten salt, and generates superheated steam; the power generation system generates power by using the superheated steam, and the low-pressure exhaust gas generated by the power generation system is used for heating and / or by a lithium bromide refrigerating unit. When the molten salt energy storage system no longer provides heat, the high-temperature workpiece waste heat serves as an effective heat source, the regulating valve one is closed, and the regulating valve two is opened; the high-temperature workpiece is transported through the dense water-cooled pipe type conveying belt from the cooling heat collection cavity, and heat is transferred to the air duct wall surface of the cooling heat collection cavity; under the action of the fan, cold air enters the air duct in the upper part of the cooling heat collection cavity, the cold air absorbs heat on the air duct wall surface to generate hot air, and the hot air enters the primary energy converter to exchange heat with the deoxygenated water generated by the softened water treatment system, and the deoxygenated water after heat exchange enters the low-temperature energy pile; When the solar energy and the high-temperature workpiece waste heat serve as the effective heat source together, the regulating valve one is opened, and the regulating valve two is closed; the high-temperature workpiece is transported through the dense water-cooled pipe type conveying belt from the cooling heat collection cavity, and heat is transferred to the air duct wall surface of the cooling heat collection cavity; under the action of the fan, cold air enters the air duct in the upper part of the cooling heat collection cavity, the cold air absorbs heat on the air duct wall surface to generate hot air; the hot air enters the primary energy converter to exchange heat with the deoxygenated water entering the primary energy converter, and the deoxygenated water after heat exchange enters the secondary energy converter to exchange heat with the high-temperature molten salt in the secondary energy converter to generate saturated steam; The low-temperature molten salt after heat exchange in the secondary energy converter enters the low-temperature molten salt energy pile, and then enters the high-temperature molten salt energy pile after being pressurized by the cold salt pump group to be preheated, and the low-temperature molten salt after preheating enters the solar heat collection field after being pressurized by the heat collection pump group, the solar heat collection field heats the low-temperature molten salt by collecting solar energy to obtain high-temperature molten salt; The high-temperature molten salt is transported to the high-temperature molten salt energy pile for storage; the saturated steam generated by the secondary energy converter enters the tertiary energy converter to exchange heat with the high-temperature molten salt to generate superheated steam; the power generation system generates power by using the superheated steam, and the low-pressure exhaust gas generated by the power generation system is used for heating by a heating user and / or a lithium bromide refrigerating unit.

2. The system for recovering waste heat from a high temperature workpiece with a molten salt energy reactor of claim 1, wherein, The power generation system comprises a turbine unit and a generator; the steam outlet of the tertiary energy converter is connected with the turbine unit, and the turbine unit is connected with the generator.

3. The system for recovering waste heat from a high temperature workpiece with a molten salt energy reactor of claim 1, wherein, The softened water treatment system comprises a resin tank, a vacuum deaeration device and a feed water pump group; a plurality of resin tanks are connected with the input end of the vacuum deaeration device, and the output end of the vacuum deaeration device is connected with the feed water inlet of the primary energy converter through the feed water pump group. The softened water treatment system comprises a resin tank, a vacuum deaeration device and a feed water pump group; a plurality of resin tanks are connected with the input end of the vacuum deaeration device, and the output end of the vacuum deaeration device is connected with the feed water inlet of the primary energy converter through the feed water pump group.

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