A waste heat recovery system and method for a hydrogen-magnesium production process

Abstract

The application provides a waste heat recovery system and method for hydrogen magnesium element manufacturing process. The waste heat recovery system is used in cooperation with a hydrogen magnesium element reaction system. After each step of reaction is completed, high-temperature compressed gas in a tank is used as a main kinetic energy and heat source to heat gas and solid raw materials in a preparation cabin. The gas and solid raw materials are then safely discharged by a discharge system. The application has the beneficial effects of: using waste heat to preheat reaction raw materials, improving thermal efficiency; preheating reaction materials can accelerate the temperature rising rate in the reaction, reduce the sudden change of reaction temperature caused by cold materials, and ensure the reaction quality; and real-time monitoring of the pressure and temperature of discharged gas ensures safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen magnesium element manufacturing process, and particularly relates to a waste heat recovery system and method for hydrogen magnesium element manufacturing process. BACKGROUND

[0002] In the hydrogen magnesium element production reaction process, high-pressure and high-temperature argon and hydrogen gas are used to participate in the reaction process, and after the reaction is completed, the high-temperature and high-pressure gas needs to be discharged to facilitate subsequent processes. Most of the existing processes are naturally cooled and discharged after decompression. The newly entered materials and gas need to be heated from low temperature (room temperature) to 400 degrees (reaction temperature) by a heating system, which causes waste of energy. The system integrates the decompression discharge function, and at the same time uses the waste heat of the gas to preheat the materials about to participate in the reaction, effectively recovers heat, greatly reduces energy consumption, and at the same time improves the speed of the heating step. SUMMARY

[0003] In order to solve the above technical problems, a waste heat recovery system and method for hydrogen magnesium element manufacturing process are disclosed in the present application. The technical scheme of the present application is as follows:

[0004] A waste heat recovery system for hydrogen magnesium element manufacturing process, comprising a reaction system, a recovery system, a controller and a gas supply tank;

[0005] The controller is connected to and controls the reaction system, the recovery system and the gas supply tank;

[0006] The reaction system comprises a reaction kettle, a reaction kettle upper cover, a reaction kettle lower cover and a heating insulation layer;

[0007] The recovery system comprises a dust cover, a waste gas pipe, a solid heat exchanger, a gas heat exchanger and a vacuum pump;

[0008] The reaction kettle upper cover is installed above the reaction kettle, the reaction kettle lower cover is installed below the reaction kettle, and the reaction kettle is located in the heating insulation layer;

[0009] The reaction kettle upper cover is provided with a gas outlet;

[0010] One end of the waste gas pipe is connected to the solid heat exchanger, the other end penetrates through the gas outlet of the reaction kettle upper cover and is inserted into the reaction kettle, and the dust cover is arranged above the inside of the reaction kettle and is connected to the waste gas pipe;

[0011] The gas heat exchanger comprises a gas heat exchanger shell and a gas heat exchanger pipeline;

[0012] The gas heat exchanger shell is connected to the solid heat exchanger and the vacuum pump;

[0013] The solid heat exchanger is connected to the gas heat exchanger.

[0014] The gas supply tank is connected to one end of the gas heat exchange pipeline through a gas tank gas outlet pipe, and the reaction kettle is connected to the other end of the gas heat exchange pipeline through a gas inlet pipe;

[0015] The vacuum pump is provided with a discharge port and a temperature sensor.

[0016] Preferably, a first valve is arranged at the connection between the exhaust pipe and the solid heat exchanger, and a second valve is arranged at the connection between the gas inlet pipe and the reaction kettle, and the first valve and the second valve are controlled by the controller.

[0017] Preferably, the solid heat exchanger comprises a solid heat exchanger shell, fins, a circulating fan and a circulating pipe.

[0018] The fins are arranged inside the solid heat exchanger shell.

[0019] The solid heat exchanger shell is provided with a circulating air duct and a discharge pipe.

[0020] The circulating fan is connected to the circulating pipe, and the circulating pipe is connected to the circulating air duct.

[0021] The discharge pipe is connected to the gas heat exchanger shell.

[0022] A push-in electric cylinder is mounted at the rear end of the solid heat exchanger shell, and a toothed shovel is mounted at the top end of the push-in electric cylinder.

[0023] An opening is arranged at the side of the reaction kettle and connected to the solid heat exchanger.

[0024] Preferably, the fins are made of copper.

[0025] A waste heat recovery method for a hydrogen-magnesium element manufacturing process uses a waste heat recovery system for a hydrogen-magnesium element manufacturing process.

[0026] Preferably, the steps include the following,

[0027] S1. After the reaction kettle completes a round of heating reaction, the control box controls the recovery system to start working.

[0028] S2. The controller controls the angle of opening of the first valve to control the gas flow. At this time, because the pressure in the reaction kettle is greater than the pressure in the recovery system, the gas in the reaction kettle enters the solid heat exchanger through the dustproof cover and the exhaust pipe in turn;

[0029] S3. The gas flows into the solid heat exchanger shell, and the fins inside start to quickly absorb heat. The material also absorbs part of the heat at the same time. At the same time, the circulating fan installed on one side of the solid heat exchanger cooperates with the circulating air duct to continuously heat or exchange heat for the fins.

[0030] S4, the exhaust gas along the outlet of the solid heat exchanger shell into the gas heat exchanger shell, at this time the circulating fan continues to run, the fin heat is gradually conducted to the material placed in the solid heat exchanger until the material temperature is equal to the fin temperature;

[0031] S5, the exhaust gas after heat exchange in the solid heat exchanger and heat loss in the pipeline enters the gas heat exchanger shell;

[0032] S6, the gas supply tank releases the to-be-reacted gas needed for the next reaction into the gas heat exchange pipeline;

[0033] At this time, because the compressed to-be-reacted gas is rapidly expanded and absorbs heat, a large amount of heat of the exhaust gas outside the gas heat exchange pipeline and inside the gas heat exchanger shell is absorbed, the temperature of the compressed gas rises, and the temperature of the exhaust gas continues to drop to a safe discharge temperature;

[0034] S7, during operation, the first valve and the gas outlet are opened and closed in real time by the control box, so that the exhaust gas pressure is always lower than the pressure of the reaction kettle, and the exhaust gas always flows in the positive direction;

[0035] S8, the exhaust gas enters the discharge port of the vacuum pump and is discharged after pressure reduction;

[0036] S9, repeat steps S2-S8 until the gas pressure in the reaction kettle and the recovery system is equal, at this time the recovery is completed, and the circulating fan of the solid heat exchanger stops running;

[0037] S10, close the discharge port, and the vacuum pump starts to work to remove the reaction kettle and the recovery system to vacuum;

[0038] S11, control the push-in electric cylinder to put the preheated material into the reaction kettle, and introduce the preheated reaction gas, and return to step S1 after the reaction is completed.

[0039] Preferably, in the S1 step, the gas pressure in the reaction kettle is 4mpa, the temperature is 400℃, and the volume is 1.8-2.2m 3 .

[0040] Preferably, at the end of the S4 step, the material temperature is 320-340℃.

[0041] Preferably, at the end of the S6 step, the temperature of the to-be-reacted gas is 100-120℃, and the temperature of the exhaust gas is 125-135℃.

[0042] Preferably, in the S7 step, the exhaust gas pressure is always maintained at 1mpa-1.5mpa.

[0043] The technical scheme of the present application can solve the technical problem that in the prior art, the hydrogen magnesium element is mostly discharged after natural cooling under reduced pressure, and the newly added materials and gas need to be lifted from low temperature (room temperature) to reaction temperature by a heating system, causing energy waste; the technical scheme of the present application can realize effective recovery of heat, greatly reduce energy consumption, and improve the speed of the heating step by integrating the reduced pressure discharge function and preheating the materials to be involved in the reaction by using waste heat.

[0044] The technical effects of the present application are as follows:

[0045] The reaction raw materials are preheated by using waste heat, and the thermal efficiency is improved.

[0046] The preheating of the reaction materials can accelerate the heating rate in the reaction.

[0047] The sudden change in reaction temperature caused by cold materials is reduced, and the reaction quality is ensured.

[0048] The pressure and temperature of the discharged gas are monitored in real time to ensure safety. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only one embodiment of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0050] Wherein the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0051] Figure 1 It is a schematic diagram of the whole system;

[0052] Figure 2 It is a schematic diagram of the whole system without a controller;

[0053] Figure 3 It is a sectional view of the hydrogen magnesium element manufacturing process heat recovery system;

[0054] Figure 4 It is a schematic diagram of the whole solid heat exchanger;

[0055] Figure 5 It is a close-up schematic diagram of the hot gas passage;

[0056] Figure 6 It is a close-up structural schematic diagram of the gas path.

[0057] In the above-mentioned drawings, the respective figure number marks represent:

[0058] 1. Reaction system

[0059] 1-1. Reaction kettle

[0060] 1-1-1. Gas inlet pipe

[0061] 1-1-2. Second valve

[0062] 1-1-3. Opening

[0063] 1-2. Kettle upper cover

[0064] 1-2-1. Gas outlet

[0065] 1-3. Kettle lower cover

[0066] 1-4. Heat insulation layer

[0067] 2. Recovery system

[0068] 2-1. Dustproof cover

[0069] 2-2. Waste gas pipe

[0070] 2-2-1. First valve

[0071] 2-3. Solid heat exchanger

[0072] 2-3-1. Solid heat exchanger shell

[0073] 2-3-1-1. Circulating air duct

[0074] 2-3-1-2. Push-in cylinder

[0075] a. Spade tooth

[0076] 2-3-1-3. Discharge pipe

[0077] 2-3-2. Fin

[0078] 2-3-3. Circulating fan

[0079] 2-3-4. Circulating pipe

[0080] 2-4. Gas heat exchanger

[0081] 2-4-1. Gas heat exchanger shell

[0082] 2-4-2. Gas heat exchange pipeline

[0083] 2-5. Vacuum pump

[0084] 2-5-1. Discharge port

[0085] 2-5-2, temperature sensor

[0086] 3, controller

[0087] 4, gas supply tank

[0088] 4-1, gas outlet pipe DETAILED DESCRIPTION

[0089] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0090] EMBODIMENT

[0091] In a specific embodiment, a waste heat recovery system for a hydrogen-magnesium production process, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , comprises a reaction system 1, a recovery system 2, a controller 3 and a gas supply tank 4;

[0092] The controller 3 is connected to and controls the reaction system 1, the recovery system 2 and the gas supply tank 4;

[0093] The reaction system 1 comprises a reaction kettle 1-1, a reaction kettle upper cover 1-2, a reaction kettle lower cover 1-3 and a heating insulation layer 1-4;

[0094] The recovery system 2 comprises a dustproof cover 2-1, a waste gas pipe 2-2, a solid heat exchanger 2-3, a gas heat exchanger 2-4 and a vacuum pump 2-5;

[0095] The reaction kettle upper cover 1-2 is installed above the reaction kettle 1-1, the reaction kettle lower cover 1-3 is installed below the reaction kettle 1-1, and the reaction kettle 1-1 is located in the heating insulation layer 1-4;

[0096] The reaction kettle upper cover 1-2 is provided with a gas outlet 1-2-1;

[0097] One end of the waste gas pipe 2-2 is connected to the solid heat exchanger 2-3, the other end of the waste gas pipe 2-2 is inserted into the reaction kettle 1-1 through the gas outlet 1-2-1 of the reaction kettle upper cover 1-2, and the dustproof cover 2-1 is arranged above the inside of the reaction kettle 1-1 and connected to the waste gas pipe 2-2;

[0098] The gas heat exchanger 2-4 comprises a gas heat exchanger shell 2-4-1 and a gas heat exchanger pipeline 2-4-2;

[0099] The gas heat exchanger shell 2-4-1 is connected with the solid heat exchanger 2-3 and the vacuum pump 2-5;

[0100] The solid heat exchanger 2-3 is connected with the gas heat exchanger 2-4;

[0101] The gas supply tank 4 is connected with one end of the gas heat exchanger pipeline 2-4-2 through the gas tank gas outlet pipe 4-1, and the reaction kettle 1-1 is connected with the other end of the gas heat exchanger pipeline 2-4-2 through the gas inlet pipe 1-1-1;

[0102] The vacuum pump 2-5 is provided with a discharge port 2-5-1 and a temperature sensor.

[0103] When the system is started for the first time, the material is placed in the reaction kettle 1-1, the normal temperature reaction gas is introduced into the reaction kettle 1-1 through the gas outlet pipe 4-1 and the gas inlet pipe 1-1-1, the heating insulation layer 1-4 is heated to increase the temperature of the reaction kettle 1-1, and the first round of heating reaction is carried out.

[0104] When the reaction kettle 1-1 completes the first round of heating reaction, the reaction kettle 1-1 has a pressure of 4mpa, a temperature of 400℃, and a volume of about 2m 3hydrogen, at this time, the recovery system 2 starts to work, first open dust cover 2-1, because the gas pressure inside the reaction kettle 1-1 is greater than the overall pressure of the recovery system 2, so the gas inside the reaction kettle 1-1 flows into the exhaust pipe 2-2, then the solid heat exchanger 2-3 absorbs part of the heat of the gas passing through the exhaust pipe 2-2; after passing through the solid heat exchanger 2-3, the gas flows into the gas heat exchanger shell 2-4-1; after entering the gas heat exchanger 2-4, due to the heat exchange of the gas passing through the solid heat exchanger 2-3 and the loss of the pipeline, the temperature is reduced to 320 degrees, at the same time, the gas supply tank 4 sends the compressed reaction gas needed for the next reaction through the gas outlet pipe 4-1, the compressed reaction gas rapidly absorbs heat and expands, absorbing a large amount of heat from the gas heat exchanger shell 2-4-1, the temperature of the reaction gas after expansion at this time rises by 100-120℃, the temperature of the exhaust gas after being discharged from the reaction kettle 1-1 is 125-135℃, which has reached the safe discharge temperature and can be safely discharged, finally, the exhaust gas enters the discharge port 2-5-1 and is discharged after pressure reduction; during operation, the controller 3 controls the opening and closing of the exhaust pipe 2-2 and the gas outlet 1-2-1 to make the gas pressure 1-1.5mpa, ensuring that the exhaust gas always flows in the positive direction, and the above steps are repeated until the pressure in the reaction kettle 1-1 and the recovery system 2 is equal, at this time the pressure is 1-1.5mpa; the recovery is completed, the solid heat exchanger 2-3 stops working, at this time, the discharge port 2-5-1 is closed, and the vacuum pump 2-5 starts to work to extract the reaction kettle 1-1 and the recovery system 2 to vacuum, because the reaction kettle 1-1 has been heated, the material preheated to 320-340℃ through the exhaust gas can be put into the reaction kettle 1-1, and finally the reaction gas is introduced, the reaction is carried out in the reaction kettle 1-1, and the above steps are repeated to form a cycle.

[0105] The system integrates pressure reduction and discharge functions, and uses waste gas heat to preheat materials to be used in the reaction, effectively recovers heat, greatly reduces energy consumption, and improves the speed of the heating step.

[0106] In a preferred embodiment, a first valve 2-2-1 is arranged at the connection between the exhaust pipe 2-2 and the solid heat exchanger 2-3, and a second valve 1-1-2 is arranged at the connection between the gas inlet pipe 1-1-1 and the reaction kettle 1-1, and the first valve 2-2-1 and the second valve 1-1-2 are controlled by the controller 3, during system operation, the first valve 2-2-1 on the exhaust pipe 2-2 is controlled by the controller 3 to open and close with the gas outlet 1-2-1, so that the pressure in the exhaust gas is always in a stable range of 1-1.5mpa, ensuring that the exhaust gas always flows in the positive direction.

[0107] In a preferred embodiment, the solid heat exchanger 2-3 comprises a solid heat exchanger shell 2-3-1, fins 2-3-2, a circulating fan 2-3-3 and a circulating pipe 2-3-4;

[0108] The fins 2-3-2 are arranged inside the solid heat exchanger shell 2-3-1;

[0109] The solid heat exchanger shell 2-3-1 is provided with a circulating air duct 2-3-1-1 and a discharge pipe 2-3-1-3;

[0110] The circulating fan 2-3-3 is connected to the circulating pipe 2-3-4, which is connected to the circulating air duct 2-3-1-1;

[0111] The discharge pipe is connected to the gas heat exchanger shell 2-4-1;

[0112] The solid heat exchanger shell 2-3-1 is provided with a push-in electric cylinder 2-3-1-2 at the rear end, and the top end of the push-in electric cylinder 2-3-1-2 is provided with a shovel tooth a;

[0113] The side of the reaction kettle 1-1 is provided with an opening 1-1-3 connected to the solid heat exchanger 2-3;

[0114] The shovel tooth a at the top end of the push-in electric cylinder 2-3-1-2 can store materials, when the gas flows into the solid heat exchanger shell 2-3-1, the fins 2-3-2 start to quickly absorb heat, at the same time, the materials also absorb part of the heat, but because the thermal conductivity of the static gas is low, the fins 2-3-2 are continuously heated by the circulating fan 2-3-3 cooperating with the circulating air duct 2-3-1-1, and the heated materials are sent into the reaction kettle 1-1 by the controller 3.

[0115] In a preferred embodiment, in order to ensure that the system has good heat conduction capacity, the fins 2-3-2 are made of copper.

[0116] A waste heat recovery method for hydrogen-magnesium element manufacturing process uses the waste heat recovery system 2 for hydrogen-magnesium element manufacturing process according to any one of claims 1-4.

[0117] The steps include the following,

[0118] S1, after the reaction kettle 1-1 completes a round of heating reaction, the control box controls the recovery system 2 to start working;

[0119] S2, the controller 3 controls the opening angle of the first valve 2-2-1 to control the gas flow, at this time, because the pressure in the reaction kettle 1-1 is greater than the pressure in the recovery system 2, the gas in the reaction kettle 1-1 enters the solid heat exchanger 2-3 in turn through the dust cover 2-1 and the exhaust pipe 2-2;

[0120] S3, the gas flows into the solid heat exchanger shell 2-3-1, the internal fins 2-3-2 begin to rapidly absorb heat, and the material also absorbs part of the heat, while the circulating fan 2-3-3 installed on one side of the solid heat exchanger 2-3 cooperates with the circulating air duct 2-3-1-1 to continuously heat or exchange heat for the fins 2-3-2;

[0121] S4, the exhaust gas enters the gas heat exchanger shell 2-4-1 along the outlet of the solid heat exchanger shell 2-3-1, at this time the circulating fan 2-3-3 continues to operate, and the heat in the fins 2-3-2 is gradually conducted to the material placed in the solid heat exchanger 2-3 until the temperature of the material and the fins 2-3-2 is equal;

[0122] S5, the exhaust gas after heat exchange in the solid heat exchanger 2-3 and heat loss in the pipeline enters the gas heat exchanger shell 2-4-1;

[0123] S6, the gas supply tank 4 releases the to-be-reacted gas needed for the next reaction into the gas heat exchange pipeline;

[0124] At this time, due to the rapid expansion heat absorption of the compressed to-be-reacted gas, a large amount of heat of the exhaust gas outside the gas heat exchange pipeline and in the gas heat exchanger shell 2-4-1 is absorbed, the temperature of the compressed gas rises, and the temperature of the exhaust gas continues to drop to a safe discharge temperature;

[0125] S7, during operation, the first valve 2-2-1 and the gas outlet 1-2-1 are opened and closed in real time by the control box, so that the exhaust gas pressure is always lower than the pressure of the reaction kettle 1-1, and the exhaust gas always flows in the positive direction;

[0126] S8, the exhaust gas enters the discharge port 2-5-1 of the vacuum pump 2-5 and is discharged after pressure reduction;

[0127] S9, repeat steps S2-S8 until the gas pressure in the reaction kettle 1-1 and the recovery system 2 is equal, at this time the recovery is completed, and the circulating fan 2-3-3 on the solid heat exchanger stops operating;

[0128] S10, close the discharge port 2-5-1, and the vacuum pump 2-5 starts to work to remove the reaction kettle 1-1 and the recovery system 2 to vacuum;

[0129] S11, control the push-in electric cylinder 2-3-1-2 to put the preheated material into the reaction kettle 1-1, and the preheated reaction gas is introduced, and after the reaction is completed, return to step S1.

[0130] By implementing the method, the system integrates the pressure reduction and discharge functions, simultaneously utilizes the waste heat of the gas to preheat the material about to participate in the reaction, effectively recovers the heat, greatly reduces the energy consumption, and improves the speed of the heating step.

[0131] In a preferred embodiment, in the step S1, the gas pressure in the reactor 1-1 is 4mpa, the temperature is 400℃, and the volume is 1.8-2.2m 3 When the reactor 1-1 completes a round of heating reaction, the recovery system 2 starts to work.

[0132] In a preferred embodiment, at the end of the step S4, the material temperature is 320-340℃, because the fan continuously conducts the heat conduction material in the fin 2-3-2 to the solid heat exchanger shell 2-3.

[0133] In a preferred embodiment, at the end of the step S6, the temperature of the gas to be reacted is 100-120℃, and the temperature of the waste gas is 125-135℃, which reaches the safe discharge temperature, so it can be safely discharged.

[0134] In a preferred embodiment, in the step S7, by controlling the opening and closing of the first valve 2-2-1 and the gas outlet 1-2-1, the waste gas pressure is always maintained at 1mpa-1.5mpa, ensuring that the waste gas always flows positively.

[0135] The beneficial effects of the present application are: using waste heat to preheat the reaction raw materials, improving the thermal efficiency; preheating the reaction materials can accelerate the heating rate in the reaction. Reduce the sudden change of reaction temperature caused by cold materials, ensure the reaction quality; real-time monitoring of exhaust gas pressure and temperature, ensure safety.

[0136] It should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A waste heat recovery system for the production process of magnesium hydrogen, characterized in that, Includes components for the reaction system, recovery system, controller, and gas supply box; The controller connects to and controls the reaction system, the recovery system, and the gas supply box; The reaction system includes a reaction vessel, a reaction vessel top cover, a reaction vessel bottom cover, and a heating and insulation layer; The recovery system includes a dust cover, an exhaust pipe, a solid heat exchanger, a gas heat exchanger, and a vacuum pump; The upper cover of the reactor is installed above the reactor, the lower cover of the reactor is installed below the reactor, and the reactor is located inside the heating and insulation layer; The upper cover of the reactor is provided with a vent. One end of the exhaust pipe is connected to the solid heat exchanger, and the other end passes through the outlet of the reactor cover and is inserted into the reactor. The dust cover is located inside the reactor and connected to the exhaust pipe. The gas heat exchanger includes a gas heat exchanger shell and gas heat exchange pipelines; The gas heat exchanger housing is connected to the solid heat exchanger and the vacuum pump; The solid heat exchanger is connected to the gas heat exchanger; The gas supply box is connected to one end of the gas heat exchange pipeline through the gas box outlet pipe, and the reaction vessel is connected to the other end of the gas heat exchange pipeline through the gas inlet pipe. The vacuum pump is equipped with a discharge port and a temperature sensor; A first valve is provided at the connection between the exhaust pipe and the solid heat exchanger, and a second valve is provided at the connection between the inlet pipe and the reactor. The first valve and the second valve are controlled by the controller. The solid heat exchanger includes a solid heat exchanger shell, fins, a circulating fan, and a circulating pipe; The fins are disposed inside the outer shell of the solid heat exchanger; The solid heat exchanger shell is provided with a circulating air duct and an exhaust pipe; The circulating fan is connected to the circulating pipe, and the circulating pipe is connected to the circulating air duct; The discharge pipe is connected to the outer shell of the gas heat exchanger; A push-in electric cylinder is installed at the rear end of the solid heat exchanger shell, and a shovel tooth is installed at the top of the push-in electric cylinder; The reaction vessel has an opening on its side for connecting to the solid heat exchanger.

2. The waste heat recovery system for the magnesium hydrogen manufacturing process according to claim 1, characterized in that, The fins are made of copper.

3. A method for waste heat recovery in the production process of magnesium hydrogen, characterized in that, Using a waste heat recovery system for a magnesium hydrogen manufacturing process as described in any one of claims 1-2; comprising the following steps: S1. After the reactor completes one round of heating reaction, the control box controls the recovery system to start working; S2. The controller controls the opening angle of the first valve, thereby controlling the gas flow rate. At this time, because the pressure inside the reactor is greater than the pressure of the recovery system, the gas inside the reactor enters the solid heat exchanger through the dust cover and the exhaust pipe in sequence. S3. Gas flows into the shell of the solid heat exchanger, and the fins inside begin to absorb heat rapidly. The material also absorbs some heat at the same time. Meanwhile, the circulating fan installed on one side of the solid heat exchanger works with the circulating air duct to continuously exchange heat with the fins. S4. The exhaust gas enters the gas heat exchanger shell through the outlet of the solid heat exchanger shell. At this time, the circulating fan continues to run, gradually transferring the heat in the fins to the material placed in the solid heat exchanger until the material temperature is equal to the fin temperature. S5. The exhaust gas, after heat exchange in the solid heat exchanger and heat loss in the pipeline, enters the outer shell of the gas heat exchanger. S6. The gas supply box releases the gas to be reacted for the next reaction into the gas heat exchange pipeline; At this time, because the compressed gas to be reacted expands rapidly and absorbs heat, it absorbs a large amount of heat from the outside of the gas heat exchange pipe and the inside of the gas heat exchanger shell, causing the temperature of the compressed gas to rise and the temperature of the exhaust gas to continue to drop to the safe discharge temperature. S7. During operation, the control box controls the opening and closing of the first valve and the outlet in real time to ensure that the exhaust gas pressure is always lower than the pressure of the reactor, thus ensuring that the exhaust gas always flows in the positive direction. S8. Exhaust gas enters the exhaust port of the vacuum pump and is discharged after pressure reduction; S9. Repeat steps S2-S8 until the gas pressure in the reactor and the recovery system are equal. At this point, the recovery is complete and the circulating fan on the solid heat exchanger stops running. S10. Close the discharge port, and the vacuum pump starts working to evacuate the reactor and recovery system to a vacuum. S11. Control the electric cylinder to put the preheated material into the reactor, introduce the preheated reaction gas, and return to step S1 after the reaction is completed.

4. The waste heat recovery method for the magnesium hydrogen manufacturing process according to claim 3, characterized in that, In step S1, the gas pressure inside the reactor is 4 MPa, the temperature is 400°C, and the volume is 1.8-2.2 m³.

5. A waste heat recovery method for a magnesium hydrogen manufacturing process according to claim 4, characterized in that, At the end of step S4, the material temperature is 320-340°C.

6. A waste heat recovery method for a magnesium hydrogen manufacturing process according to claim 5, characterized in that, When step S6 ends, the temperature of the gas to be reacted is 100-120°C and the temperature of the exhaust gas is 125-135°C.

7. A waste heat recovery method for a magnesium hydrogen manufacturing process according to claim 6, characterized in that, During step S7, the exhaust gas pressure is maintained at 1 MPa-1.5 MPa.

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