Hydrogen recovery system and hydrogen recovery method based on bell-type annealing furnace

Abstract

The invention provides a hydrogen recovery system and a hydrogen recovery method based on a bell-type annealing furnace, the hydrogen recovery system comprises a hydrogen separation pressure stabilizing system, a hydrogen pressurization and transportation system and a hydrogen purification and drying system, the hydrogen separation pressure stabilizing system is connected with a waste gas outlet of the bell-type annealing furnace; the hydrogen separation and pressure stabilization system, the hydrogen pressurization and transportation system and the hydrogen purification and drying system are sequentially connected through pipelines; the hydrogen separation pressure stabilizing system is used for separating hydrogen in waste gas generated by the bell-type annealing furnace to obtain separated hydrogen; the hydrogen pressurizing and transporting system is used for pressurizing the separated hydrogen to obtain pressurized hydrogen; and the hydrogen purifying and drying system is used for purifying the pressurized hydrogen to obtain purified hydrogen. By means of the hydrogen recovery system, hydrogen in waste gas generated by the high-temperature bell-type annealing furnace can be recovered, and the phenomenon of resource waste is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a hydrogen recovery system and a hydrogen recovery method based on a bell-type annealing furnace. Background Art

[0002] The high-temperature bell-type annealing furnace is a heat treatment equipment that uses a fixed furnace table and a heating hood to realize the high-temperature heat treatment process of silicon steel coils according to the heat treatment process requirements of the steel grade. It has the characteristics of small footprint, flexible production organization, easy change and control of temperature and atmosphere, etc., and is suitable for small batch production and heat treatment process exploration and research. In the normal production process, nitrogen is used to purge the furnace and the inner hood space, and nitrogen is used to replace the air in the furnace and the inner hood. After the replacement is completed, nitrogen and hydrogen mixture or full hydrogen are introduced in a certain proportion according to the process requirements until the heat treatment process is completed. Then nitrogen is used to purge the furnace to displace the hydrogen. Hydrogen is used as a protective gas throughout the production process and is finally ignited by the discharge port of the heating hood. This part of hydrogen has a high recycling value, and direct ignition is very wasteful. Summary of the invention

[0003] The present application provides a hydrogen recovery system and a hydrogen recovery method based on a bell-type annealing furnace, which can effectively recover hydrogen from the waste gas generated by the high-temperature bell-type annealing furnace and avoid waste of resources.

[0004] In a first aspect, the present application provides a hydrogen recovery system based on a bell-type annealing furnace, wherein the hydrogen recovery system comprises a hydrogen separation and pressure stabilization system, a hydrogen pressurization and transportation system, and a hydrogen purification and drying system, wherein the hydrogen separation and pressure stabilization system is connected to the exhaust gas outlet of the bell-type annealing furnace, and the hydrogen separation and pressure stabilization system, the hydrogen pressurization and transportation system, and the hydrogen purification and drying system are sequentially connected through pipelines;

[0005] The hydrogen separation and pressure stabilization system is used to separate the hydrogen in the waste gas generated by the bell-type annealing furnace to obtain separated hydrogen;

[0006] The hydrogen pressurizing and transporting system is used to pressurize the separated hydrogen output by the hydrogen separation and pressure stabilizing system to obtain pressurized hydrogen;

[0007] The hydrogen purification and drying system is used to purify the pressurized hydrogen output by the hydrogen pressurization and transportation system to obtain purified hydrogen.

[0008] Optionally, the hydrogen separation and pressure stabilization system comprises a cooler, an induced air fan, a filter and a separator; the cooler, the induced air fan, the filter and the separator are sequentially connected through pipelines;

[0009] The cooler is used to inhale the waste gas generated by the bell-type annealing furnace and cool the waste gas under the suction force provided by the induced air fan to obtain the cooled waste gas;

[0010] The induced air fan is used to introduce the exhaust gas generated by the bell-type annealing furnace from the outlet of the bell-type annealing furnace into the cooler, and to introduce the cooled exhaust gas into the filter;

[0011] The filter is used to filter the cooled exhaust gas to obtain filtered exhaust gas;

[0012] The separator is used to separate the hydrogen in the filtered exhaust gas to obtain the separated hydrogen.

[0013] Optionally, a first pressure stabilizing system is provided on the pipeline between the filter and the separator;

[0014] The first pressure stabilization system is used to supply hydrogen to the separator when the supply amount of the filtered exhaust gas is lower than a first preset supply amount, so as to maintain stable operation of the separator.

[0015] Optionally, the induced air fan is a variable frequency induced air fan, and the power of the variable frequency induced air fan is determined according to the pressure in the bell-type annealing furnace.

[0016] Optionally, the hydrogen pressurization and transportation system comprises a gas collecting tank and a pressurization device, and the gas collecting tank and the pressurization device are sequentially connected via a pipeline;

[0017] The gas collecting tank is used to store the separated hydrogen;

[0018] The boosting device is used to boost the pressure of the hydrogen output from the gas collecting tank so that the pressure of the hydrogen entering the hydrogen purification and drying system is above a preset pressure value.

[0019] Optionally, the boosting device is a boosting pump and / or a compressor.

[0020] Optionally, the hydrogen purification and drying system comprises a deaerator, a first buffer tank, a heat exchanger, a filter and a purification device, and the deaerator, the first buffer tank, the heat exchanger, the filter and the purification device are sequentially connected through pipelines;

[0021] The deaerator is used to deoxygenate the hydrogen output by the hydrogen pressurization and transportation system to obtain deoxygenated hydrogen;

[0022] The first buffer tank is used to store the deoxygenated hydrogen;

[0023] The heat exchanger is used to heat the deoxygenated hydrogen to obtain heated hydrogen;

[0024] The filter is used to filter the heated hydrogen to obtain filtered hydrogen;

[0025] The purification device is used to purify the filtered hydrogen to obtain the purified hydrogen.

[0026] Optionally, a second pressure stabilizing system is provided on the pipeline between the filter and the purification device;

[0027] The second pressure stabilization system is used to supply hydrogen to the pipeline when the supply amount of the filtered hydrogen is lower than a second preset supply amount, so as to maintain stable operation of the purification device.

[0028] Optionally, the hydrogen purification and drying system further comprises a second buffer tank, and the second buffer tank is connected to the bell-type annealing furnace via a pipeline;

[0029] The second buffer tank is used to store the purified hydrogen and supply the purified hydrogen to the bell-type annealing furnace.

[0030] In a second aspect, the present application provides a hydrogen recovery method based on a bell-type annealing furnace, which is applied to the hydrogen recovery system described in the first aspect of the present application, and the method comprises:

[0031] The hydrogen in the waste gas generated by the bell-type annealing furnace is separated by the hydrogen separation and pressure stabilization system to obtain separated hydrogen;

[0032] The separated hydrogen output by the hydrogen separation and pressure stabilization system is pressurized by the hydrogen pressurization and transportation system to obtain pressurized hydrogen;

[0033] The pressurized hydrogen output by the hydrogen pressurization and transportation system is purified by the hydrogen purification and drying system to obtain purified hydrogen.

[0034] A third aspect of the present application provides an electronic device, the electronic device comprising:

[0035] processor;

[0036] a memory for storing instructions executable by the processor;

[0037] Wherein, the processor is configured to execute to implement a hydrogen recovery method based on a bell-type annealing furnace as described in the second aspect of the present application.

[0038] The fourth aspect of the present application provides a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute a hydrogen recovery method based on a hood annealing furnace as described in the second aspect of the present application.

[0039] The present application provides a hydrogen recovery system based on a bell-type annealing furnace, which can effectively recover hydrogen from the waste gas generated by the high-temperature bell-type annealing furnace to avoid waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a schematic diagram of a hydrogen recovery system shown in one embodiment of the present application;

[0042] Figure 2 This is a flow chart of a hydrogen recovery method shown in one embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are 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 ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] Figure 1 Schematic diagram of a hydrogen recovery system shown in one embodiment of the present application. Figure 1 The hydrogen recovery system of the present application includes a hydrogen separation and pressure stabilization system, a hydrogen pressurization and transportation system, and a hydrogen purification and drying system, wherein the hydrogen separation and pressure stabilization system is connected to the exhaust gas outlet of the hood-type annealing furnace, and the hydrogen separation and pressure stabilization system, the hydrogen pressurization and transportation system, and the hydrogen purification and drying system are connected in sequence through pipelines.

[0045] The hydrogen separation and pressure stabilization system is used to separate the hydrogen in the waste gas generated by the bell-type annealing furnace to obtain separated hydrogen;

[0046] The hydrogen pressurization and transportation system is used to pressurize the separated hydrogen output by the hydrogen separation and pressure stabilization system to obtain pressurized hydrogen;

[0047] The hydrogen purification and drying system is used to purify the pressurized hydrogen output by the hydrogen pressurization and transportation system to obtain purified hydrogen.

[0048] The following will describe in detail the hydrogen separation and pressure stabilization system, hydrogen pressurization and transportation system, and hydrogen purification and drying system:

[0049] (1) Hydrogen separation and pressure stabilization system

[0050] The hydrogen separation and pressure stabilization system comprises a cooler, an induced air fan, a filter and a separator, and the cooler, the induced air fan, the filter and the separator are connected in sequence through pipelines.

[0051] The cooler is used to inhale the waste gas generated by the hood annealing furnace and cool the waste gas under the suction force provided by the induced air fan to obtain the cooled waste gas.

[0052] The exhaust fan is used to introduce the exhaust gas generated by the hood annealing furnace from the outlet of the hood annealing furnace into the cooler, and to introduce the cooled exhaust gas into the filter.

[0053] The filter is used to filter the cooled exhaust gas to obtain filtered exhaust gas.

[0054] The separator is used to separate the hydrogen in the filtered exhaust gas to obtain separated hydrogen.

[0055] A first pressure stabilizing system is provided on the pipeline between the filter and the separator. The first pressure stabilizing system is used to supply hydrogen to the separator when the supply amount of the filtered exhaust gas is lower than a first preset supply amount, so as to maintain stable operation of the separator.

[0056] The induced air fan is a variable frequency induced air fan, and the power of the variable frequency induced air fan is determined according to the pressure in the hood annealing furnace.

[0057] Specifically, in the embodiment of the present application, in the hydrogen separation pressure stabilization system, the air inlet of the induced air fan is connected to the exhaust gas outlet of the hood-type annealing furnace, and the exhaust gas outlet is provided with an automatic adjustment flap valve for controlling the furnace pressure of the hood-type annealing furnace. When the furnace pressure increases, the opening of the automatic adjustment flap valve becomes larger, and the power of the variable frequency motor of the induced air fan becomes larger accordingly. When the furnace pressure stabilizes in a reasonable range, the power of the automatic adjustment flap valve and the induced air fan no longer changes. When the furnace pressure decreases, the opening of the automatic adjustment flap valve becomes smaller, and the power of the variable frequency motor of the induced air fan becomes smaller accordingly. After the furnace pressure stabilizes in a reasonable range, the power of the automatic adjustment flap valve and the induced air fan no longer changes.

[0058] Reference Figure 1After the flap valve is automatically adjusted, the exhaust gas pipeline is divided into two routes, one is the exhaust system, which is equipped with a burner and a diffuser, and the other is connected to the cooler. The burner is used to burn the hydrogen in the exhaust gas and then discharge it. The diffuser is mainly used to discharge the exhaust gas without hydrogen.

[0059] During the normal production process of the bell-type furnace, the change in temperature and the increase or decrease in the amount of protective gas introduced in different process stages will cause changes in the pressure in the furnace. Therefore, the induced air fan in the hydrogen separation pressure stabilization system is a variable frequency fan, which can adjust the fan power according to the change in the pressure in the furnace and change the induced air volume to control the furnace pressure.

[0060] The cooler is a water-cooled countercurrent cooler, which is used to adjust the water inlet and return volume of the cooler according to different annealing stages and different furnace temperatures.

[0061] The induced air fan is a variable frequency induced air fan, and two are installed. The power of the induced air fan is controlled according to the pressure in the furnace. When the pressure in the furnace exceeds the set value, the induced air fan increases the power, otherwise it reduces the power.

[0062] There are two sets of filters, one for backup and one for use, which are mainly used to filter solid impurities such as oil, refractory materials, sealing sand, etc. in the exhaust gas.

[0063] The separator is used to remove impurities such as oil vapor, water vapor, dust, etc. from hydrogen.

[0064] The first pressure stabilization system consists of an accumulator, one end of which is connected to the pure hydrogen pipeline network and the other end is connected to the separator, which is used to stabilize the pipeline pressure after the filter.

[0065] (2) Hydrogen pressurization and transportation system

[0066] The hydrogen boosting and transportation system includes a gas collecting tank and a boosting device, which are connected in sequence through pipelines. The gas collecting tank is used to store the separated hydrogen. The boosting device is used to boost the hydrogen output from the gas collecting tank so that the pressure of the hydrogen entering the hydrogen purification and drying system is above the preset pressure value.

[0067] Wherein, the boosting device is a boosting pump and / or a compressor.

[0068] In the embodiment of the present application, the gas collecting tank mainly serves to collect gas and buffer the front and rear systems (buffer the amount of gas generated at different stages of annealing furnace production and the amount of hydrogen used in different states of the hydrogen pressurization and transportation system).

[0069] The booster pump may be a Roots booster pump, which is used to boost the gas in the pipeline to achieve pressurized transmission of the gas.

[0070] The compressor is used to stabilize and increase the gas pressure in the pipeline to ensure that the gas entering the next step has a certain pressure.

[0071] (3) Hydrogen purification and drying system

[0072] The hydrogen purification and drying system comprises a deaerator, a first buffer tank, a heat exchanger, a filter and a purification device, and the deaerator, the first buffer tank, the heat exchanger, the filter and the purification device are sequentially connected through pipelines.

[0073] The deaerator is used to deoxygenate the hydrogen output from the hydrogen pressurization and transportation system to obtain deoxygenated hydrogen.

[0074] The first buffer tank is used to store deoxygenated hydrogen.

[0075] The heat exchanger is used to heat the deoxygenated hydrogen to obtain heated hydrogen.

[0076] The filter is used to filter the heated hydrogen to obtain filtered hydrogen.

[0077] The purification device is used to purify the filtered hydrogen to obtain purified hydrogen.

[0078] A second pressure stabilizing system is arranged on the pipeline between the filter and the purification device.

[0079] The second pressure stabilization system is used to supply hydrogen to the pipeline when the supply amount of the filtered hydrogen is lower than the second preset supply amount, so as to maintain the stable operation of the purification device.

[0080] In the embodiment of the present application, the hydrogen purification and drying system further comprises a second buffer tank, which is connected to the bell-type annealing furnace via a pipeline. The second buffer tank is used to store purified hydrogen and supply the purified hydrogen to the bell-type annealing furnace.

[0081] In this embodiment, the raw hydrogen is heated and then enters a deaerator equipped with a palladium catalyst. In the deaerator, trace oxygen in the hydrogen reacts with the hydrogen under the action of the catalyst to generate water vapor O2+2H2→2H2O, and then the water is removed by condensation to achieve the purpose of deoxygenation.

[0082] The first buffer tank after the deaerator is used to store temporary gas to ensure uninterrupted gas supply for subsequent steps.

[0083] The heat exchanger is used to heat the gas in the pipeline and provide constant temperature gas for subsequent use.

[0084] The filter is used to filter the hydrogen after deoxygenation and dehydration to ensure that there are no solid particle impurities in the gas in the pipeline.

[0085] The purification device is a PSA pressure swing adsorption device. At a constant temperature, the adsorption capacity of the adsorbent increases with the increase of its partial pressure. When the pressure is reduced or evacuated, the adsorbent is desorbed and regenerated. An adsorbent that is difficult to adsorb hydrogen is selected to adsorb impurities in the hydrogen source at room temperature to achieve separation of hydrogen and impurities. Commonly used adsorbents include activated alumina, silica gel, molecular sieves, activated carbon, etc.

[0086] The second buffer tank after the purification unit is used to store temporary gas to ensure uninterrupted gas supply for subsequent steps.

[0087] During normal production, the bell annealing furnace will go through the following stages. The following will explain the use of the hydrogen recovery system in combination with the following stages:

[0088] (1) Purge stage

[0089] After completing the operation steps of loading, buckling the inner cover, buckling the heating cover, etc., the inner cover and furnace purge stage is entered first. In this stage, the protective gas supply system of the hood annealing furnace supplies a large amount of nitrogen to the inner cover and furnace to purge the oxygen in the inner cover and furnace. At this time, the exhaust gas generated by the hood annealing furnace passes through the exhaust gas pipeline and the automatic control flap valve, and finally is directly discharged from the vent pipeline to the outside of the factory. During this whole stage, the vent valve is in the automatic open state, and the burner pipeline valve is in the closed state.

[0090] (2) Heating stage

[0091] When the inner cover and furnace are purged, the oxygen content in the inner cover and furnace is reduced to below the process requirements, and the bell-type annealing furnace system begins to enter the heating stage. In this stage, pure hydrogen and nitrogen are mixed in a certain proportion and begin to be supplied to the bell-type annealing furnace. At the same time, the vent valve on the vent pipeline is automatically closed, and the valve on the burner pipeline is automatically opened. At this time, the hydrogen content is relatively low, and the exhaust gas generated by the bell-type annealing furnace passes through the exhaust pipeline, through the flap valve, and is ignited by the ignition device at the burner before being discharged.

[0092] (3) The temperature of the bell annealing furnace reaches the process temperature

[0093] After the bell-type annealing furnace is heated to the process temperature, 100% pure hydrogen begins to be supplied. At this time, the valve on the bell-type annealing furnace burner pipeline is automatically closed, and the exhaust gas begins to be supplied to the hydrogen recovery system. The working process of the hydrogen recovery system includes the following steps:

[0094] Step 1: The exhaust fan starts to start. Under the action of the exhaust fan, the exhaust gas passes through the cooler. The high-temperature exhaust gas transfers heat to the water medium and the temperature is reduced. This step can reduce the damage of high-temperature exhaust gas to subsequent equipment.

[0095] The second step: the exhaust gas is continuously supplied to the subsequent filter through the exhaust fan. Since the exhaust gas contains a certain amount of solid particles, oil, water vapor and other impurities, the larger solid particles and other impurities in the exhaust gas are filtered out after passing through the filter. This step can achieve the preliminary separation and purification of hydrogen.

[0096] Step 3: The initially purified exhaust gas enters the separator, which mainly plays a filtering and settling role. Exhaust gas containing a small amount of oil, water vapor and hydrogen enters the separator and flows through the internal oil vapor filter layer. The filter layer uses a hydrogen filter medium with extremely strong adsorption for oil vapor, which can filter out oil vapor, dust and other impurities in the exhaust gas at one time, realizing the secondary separation and purification of hydrogen.

[0097] Among them, a first pressure stabilizing system is arranged in front of the separator. When the exhaust gas supply of the bell-type annealing furnace is abnormal, the first pressure stabilizing system automatically starts and starts to supply pure hydrogen to the separator to ensure the normal operation of the hydrogen separation system.

[0098] Step 4: The hydrogen after secondary separation and purification enters the gas collecting tank, which mainly collects gas and buffers the front and rear systems.

[0099] Step 5: The hydrogen in the gas tank passes through a booster pump (hydrogen Roots pump) to increase the hydrogen pressure and transport the hydrogen to the hydrogen pipeline network.

[0100] Step 6: Hydrogen is transported to the front end of the hydrogen compressor through the hydrogen pipeline network. The main function of the hydrogen compressor is to compress the hydrogen to a high-pressure state so that it can be stored and transported in tanks or pipelines. This high-pressure state can greatly reduce the volume of hydrogen, thereby improving storage density and transportation efficiency.

[0101] Step 7: The compressed hydrogen enters the deaerator. The principle of hydrogen deoxygenation is to reduce the oxygen concentration by passing hydrogen into a solution containing dissolved oxygen, thereby achieving the purpose of deoxygenation. The water generated by the reaction of hydrogen and oxygen will be discharged from the deaerator along with the hydrogen.

[0102] Step 8: The deoxygenated hydrogen enters the first buffer tank, which mainly collects gas and buffers the front and rear systems.

[0103] Step 9: The room temperature hydrogen in the first buffer tank is heated to a certain temperature through a heat exchanger to ensure that the hydrogen entering the subsequent purification device is at a constant temperature to meet the working requirements of the subsequent purification device. The purification device is a PSA pressure swing adsorption hydrogen production equipment.

[0104] Step 10: The heated hydrogen enters the filter to filter out impurities in the hydrogen to prevent impurities in the hydrogen from entering subsequent purification equipment and affecting the normal operation of the equipment.

[0105] Step 11: The hydrogen enters the purification device, which uses pressure swing adsorption to separate the gas mixture by utilizing the difference in the "adsorption" properties of molecular sieves to different gas molecules, thereby increasing the purity of the hydrogen to meet the preset requirements.

[0106] When an abnormal situation occurs in the supply of hydrogen after heating and filtration, the second pressure stabilization system automatically starts and begins to supply pure hydrogen to the purification device to ensure the normal operation of the hydrogen production equipment.

[0107] Step 12: The purified hydrogen is transported to the second buffer tank, which continuously supplies hydrogen to the annealing furnace according to the hydrogen consumption of the bell-type annealing furnace. Before supplying the recycled hydrogen, a hydrogen analyzer is installed on the recycled hydrogen supply pipeline to measure the hydrogen content in the pipeline to monitor the quality of the hydrogen supplied to the bell-type annealing furnace.

[0108] Through the first to twelfth steps, the recovery and use of hydrogen passing through the bell-type annealing furnace can be achieved.

[0109] (4) Late purge stage

[0110] After the process annealing stage is completed, the hood annealing furnace enters the later purge stage and starts the nitrogen purge step. At this time, the hydrogen recovery system is closed, and the valve in front of the burner is automatically opened. The exhaust gas of the hood annealing furnace passes through the exhaust gas pipeline, through the flap valve, and is ignited by the ignition device at the burner and then discharged until the production of the hood annealing furnace is completed.

[0111] The above recovery method is not strict on the impurities in the raw gas, and generally no pretreatment is required. The hydrogen content in the raw gas is generally 50%-90%. When the hydrogen content is relatively low, the pressure swing adsorption method has more prominent advantages. At the same time, the pressure swing adsorption method can separate high-purity hydrogen with a purity of up to 99%-99.99%.

[0112] In this application, all devices are connected by pipelines, matching flanges, bolts, nuts, washers, inlet and outlet flange gaskets (using stainless steel wrapped graphite pads). For all steel plates used for structural parts, the surface is first pre-treated, and then the CNC cutting machine is used for centralized cutting. After passing the welding, the welding is mainly carried out by carbon dioxide gas shielded welding. After welding, non-destructive testing is performed on the welds with flaw detection requirements, and then annealing and stress relief treatment are performed. Then the surface is shot peened and primer is applied, and then machining is performed after passing the machining.

[0113] In the present application, the hydrogen recovery system is applied to the field of annealing furnaces using pure hydrogen, high hydrogen or nitrogen-hydrogen mixed gas as protective atmosphere. The high value-added hydrogen-containing protective gas directly discharged from the annealing furnace can be recovered and purified, and the recovered gas is supplied to the annealing furnace again to achieve efficient circulation of hydrogen. The hydrogen recovery system can efficiently recover and process the hydrogen discharged from the annealing furnace, and the various technical indicators of the recovered gas meet the gas requirements of the annealing furnace, which can ensure the excellent quality of the annealing product. In summary, the online hydrogen recovery system applied to the high-temperature full-hydrogen annealing furnace of the present application has at least the following technical effects:

[0114] First, the cost of using protective gas has been greatly reduced, and the hydrogen recovery rate of the hydrogen recovery device is above 80%, achieving a significant reduction in hydrogen consumption.

[0115] Second, the device has a high degree of automation and strong stability, requires minimal operation and maintenance, and is managed together with the annealing furnace, without the need for additional dedicated operation and maintenance personnel.

[0116] Third, the hydrogen recovery device effectively removes impurities such as oil and dust in the waste hydrogen, reduces pollutant emissions into the air, reduces carbon dioxide emissions, and helps companies achieve green and clean production.

[0117] Fourth, for companies that produce their own hydrogen, they can either reduce the amount of electricity and hydrogen raw materials purchased from outside, or sell the surplus hydrogen to the outside world, thereby helping the development of the society's hydrogen energy industry.

[0118] Based on the same inventive concept, an embodiment of the present application provides a hydrogen recovery method based on a bell-type annealing furnace, such as Figure 2 shown. Figure 2 1 is a flow chart of a hydrogen recovery method based on a bell-type annealing furnace according to an embodiment of the present application. Figure 2 , the method of the present application comprises:

[0119] Step S21: separating hydrogen from the exhaust gas generated by the bell-type annealing furnace through the hydrogen separation and pressure stabilization system to obtain separated hydrogen;

[0120] Step S22: pressurizing the separated hydrogen output by the hydrogen separation and pressure stabilization system through the hydrogen pressurization and transportation system to obtain pressurized hydrogen;

[0121] Step S23: Purifying the pressurized hydrogen output by the hydrogen pressurization and transportation system through the hydrogen purification and drying system to obtain purified hydrogen.

[0122] The execution device of the method of the present application may be a controller, which is responsible for controlling the working process of the entire hydrogen recovery system. The specific description of the method part is detailed in the above embodiment, which will not be repeated here.

[0123] The present application also provides an electronic device, which includes:

[0124] processor;

[0125] a memory for storing instructions executable by the processor;

[0126] Wherein, the processor is configured to execute to implement a hydrogen recovery method based on a bell-type annealing furnace described in an embodiment of the present application.

[0127] An embodiment of the present application also provides a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute a hydrogen recovery method based on a hood annealing furnace as described in an embodiment of the present application.

[0128] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0129] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0130] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0132] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0133] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A hydrogen recovery system based on a bell-type annealing furnace, characterized in that: The hydrogen recovery system includes a hydrogen separation and pressure stabilization system, a hydrogen pressurization and transportation system, and a hydrogen purification and drying system. The hydrogen separation and pressure stabilization system is connected to the exhaust gas outlet of the bell-type annealing furnace. The hydrogen separation and pressure stabilization system, the hydrogen pressurization and transportation system, and the hydrogen purification and drying system are connected in sequence through pipelines. The hydrogen separation and pressure stabilization system is used to separate the hydrogen in the waste gas generated by the bell-type annealing furnace to obtain separated hydrogen; The hydrogen pressurizing and transporting system is used to pressurize the separated hydrogen output by the hydrogen separation and pressure stabilizing system to obtain pressurized hydrogen; The hydrogen purification and drying system is used to purify the pressurized hydrogen output by the hydrogen pressurization and transportation system to obtain purified hydrogen.

2. The method according to claim 1, characterized in that The hydrogen separation and pressure stabilization system comprises a cooler, an induced air fan, a filter and a separator; the cooler, the induced air fan, the filter and the separator are connected in sequence through pipelines; The cooler is used to inhale the waste gas generated by the bell-type annealing furnace and cool the waste gas under the suction force provided by the induced air fan to obtain the cooled waste gas; The induced air fan is used to introduce the exhaust gas generated by the bell-type annealing furnace from the outlet of the bell-type annealing furnace into the cooler, and to introduce the cooled exhaust gas into the filter; The filter is used to filter the cooled exhaust gas to obtain filtered exhaust gas; The separator is used to separate the hydrogen in the filtered exhaust gas to obtain the separated hydrogen.

3. The method according to claim 2, characterized in that A first pressure stabilizing system is provided on the pipeline between the filter and the separator; The first pressure stabilization system is used to supply hydrogen to the separator when the supply amount of the filtered exhaust gas is lower than a first preset supply amount, so as to maintain stable operation of the separator.

4. The method according to claim 2, characterized in that: The induced air fan is a variable frequency induced air fan, and the power of the variable frequency induced air fan is determined according to the pressure in the bell-type annealing furnace.

5. The method according to claim 1, characterized in that The hydrogen pressurizing and transporting system comprises a gas collecting tank and a pressurizing device, wherein the gas collecting tank and the pressurizing device are connected in sequence via a pipeline; The gas collecting tank is used to store the separated hydrogen; The boosting device is used to boost the pressure of the hydrogen output from the gas collecting tank so that the pressure of the hydrogen entering the hydrogen purification and drying system is above a preset pressure value.

6. The method according to claim 5, characterized in that The boosting device is a boosting pump and / or a compressor.

7. The method according to claim 1, characterized in that The hydrogen purification and drying system comprises a deaerator, a first buffer tank, a heat exchanger, a filter and a purification device, wherein the deaerator, the first buffer tank, the heat exchanger, the filter and the purification device are sequentially connected through pipelines; The deaerator is used to deoxygenate the hydrogen output by the hydrogen pressurization and transportation system to obtain deoxygenated hydrogen; The first buffer tank is used to store the deoxygenated hydrogen; The heat exchanger is used to heat the deoxygenated hydrogen to obtain heated hydrogen; The filter is used to filter the heated hydrogen to obtain filtered hydrogen; The purification device is used to purify the filtered hydrogen to obtain the purified hydrogen.

8. The method according to claim 7, characterized in that A second pressure stabilizing system is provided on the pipeline between the filter and the purification device; The second pressure stabilization system is used to supply hydrogen to the pipeline when the supply amount of the filtered hydrogen is lower than a second preset supply amount, so as to maintain stable operation of the purification device.

9. The method according to claim 7, characterized in that: The hydrogen purification and drying system further comprises a second buffer tank, and the second buffer tank is connected to the bell-type annealing furnace through a pipeline; The second buffer tank is used to store the purified hydrogen and supply the purified hydrogen to the bell-type annealing furnace.

10. A hydrogen recovery method based on a bell-type annealing furnace, characterized in that: Applied to the hydrogen recovery system according to any one of claims 1 to 9, the hydrogen recovery method comprises: The hydrogen in the waste gas generated by the bell-type annealing furnace is separated by the hydrogen separation and pressure stabilization system to obtain separated hydrogen; The separated hydrogen output by the hydrogen separation and pressure stabilization system is pressurized by the hydrogen pressurization and transportation system to obtain pressurized hydrogen; The pressurized hydrogen output by the hydrogen pressurization and transportation system is purified by the hydrogen purification and drying system to obtain purified hydrogen.

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