Hydrogen purification device and control method thereof

Abstract

According to the hydrogen purification device and the control method of the hydrogen purification device, the structure of the hydrogen purification device is improved, so that long-term removal of alkali mist is facilitated, and the influence of accumulation of the alkali mist on a deoxidation tower and subsequent working sections is prevented. In order to achieve the purpose, the hydrogen purification device comprises a raw material gas supply pipeline and a deoxidation system communicated with the tail end of the raw material gas supply pipeline, the raw material gas supply pipeline is provided with an alkali mist removal device, the alkali mist removal device is provided with a reaction channel, the reaction channel is used for allowing raw material gas to circulate, and the deoxidation system is communicated with the tail end of the raw material gas supply pipeline. The reaction channel is provided with an acidic material, and the alkali mist in the raw material gas reacts with the acidic material in the reaction channel. The alkali mist removing device is arranged, so that the alkali mist removing task of the raw material gas is separated from the deoxidation system, the alkali mist can be removed for a long time, and the influence of accumulation of the alkali mist on the deoxidation system and subsequent working sections is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen purification, and in particular to a hydrogen purification device and a control method for the hydrogen purification device. Background Art

[0002] In the alkaline water electrolysis hydrogen production process, hydrogen purification is a crucial link, which is directly related to the quality and production efficiency of the final hydrogen product. Among them, removing the alkaline mist entrained in the hydrogen is a key task in the purification process. At present, the method commonly used in the industry is to lay a small amount of acidic catalyst in the deoxygenation tower, aiming to effectively remove the alkaline mist component in the hydrogen through acid-base neutralization reaction.

[0003] However, this existing design has gradually exposed a series of problems in long-term actual operation. First, the deoxygenation catalyst used in the deoxygenation tower is usually designed to have a service life of 2 to 3 years. This means that the deoxygenation catalyst needs to be replaced or regenerated every few years to ensure its continued effective catalytic performance. However, since a certain amount of alkaline mist is inevitably entrained in hydrogen, the acidic catalyst will gradually accumulate acid mist while neutralizing the alkaline mist.

[0004] As the flow of gas continues, the amount of acid mist entrained in the hydrogen will gradually increase and accumulate in the deoxidation tower. If not cleaned in time, the accumulated acid mist will cause serious pollution to the deoxidation catalyst. This pollution will not only significantly reduce the catalytic efficiency of the deoxidation catalyst, thereby affecting its deoxidation effect, but may also have an adverse effect on the subsequent drying section, resulting in a decrease in the efficiency and quality of the entire purification process. Therefore, although the existing method for removing alkali mist has a certain effect in the short term, it faces problems such as short catalyst life, easy pollution and high maintenance cost in long-term operation. Summary of the invention

[0005] The purpose of the invention is to provide a hydrogen purification device and a control method for the hydrogen purification device. By improving the structure of the hydrogen purification device, it is beneficial to remove alkali mist for a long time and prevent the accumulation of alkali mist from affecting the deoxygenation tower and subsequent work sections.

[0006] To achieve the above-mentioned purpose, the present invention provides a hydrogen purification device, comprising a raw gas supply pipeline and a deoxygenation system connected to the tail end of the raw gas supply pipeline, the raw gas supply pipeline is provided with a de-alkali mist device, the de-alkali mist device has a reaction channel, the reaction channel is used to allow the raw gas to flow, the reaction channel is provided with an acidic substance, and the alkaline mist in the raw gas reacts with the acidic substance in the reaction channel.

[0007] By setting up the alkali mist removal device, the alkali mist removal task of the raw gas is separated from the deoxygenation system, which is beneficial to the long-term removal of alkali mist and prevents the accumulation of alkali mist from affecting the deoxygenation system and subsequent work sections.

[0008] Optionally, the raw gas supply pipeline includes at least one raw gas sub-tube, each of which can be connected or disconnected with the deoxygenation system independently; the de-alkali mist device is arranged on the corresponding raw gas sub-tube. In this way, the de-alkali mist process can be carried out on the raw gas by multiple de-alkali mist devices together, thereby increasing the de-alkali mist efficiency; in addition, it is also convenient to replace the de-alkali mist device without stopping for maintenance, which is conducive to the continuous operation of the system.

[0009] Optionally, the de-alkali mist device includes a de-alkali mist inlet and a de-alkali mist outlet; each of the raw gas sub-pipes is provided with two raw gas valves, one of which is provided at one side of the de-alkali mist inlet, and the other of which is provided at one side of the de-alkali mist outlet. By providing a raw gas valve at each of the de-alkali mist inlet and the de-alkali mist outlet of the de-alkali mist device, it is convenient to close the upstream and downstream valves of the corresponding de-alkali mist device during maintenance, thereby facilitating the maintenance and replacement of the de-alkali mist device.

[0010] Optionally, it further comprises an air blowing system, the air blowing system comprises an air blowing pipeline and an air collecting pipeline, one end of the air blowing pipeline is connected to the safety air supply device, and the other end can be connected or disconnected with each of the raw gas sub-pipes separately; one end of the air collecting pipeline can be connected or disconnected with each of the raw gas sub-pipes separately;

[0011] The position where the other end of the air blowing pipeline is connected to each of the raw gas sub-pipes is located between the de-alkali mist inlet and the raw gas valve on the same side, and the position where the gas collecting pipeline is connected to each of the raw gas sub-pipes is located between the de-alkali mist outlet and the raw gas valve on the same side.

[0012] By setting up an air blowing system, before replacing the de-alkali mist device, the air blowing system is turned on, and the air blowing pipeline transports safety gas to the reaction channel of the de-alkali mist device through part of the raw gas sub-tube, so that the hydrogen in the reaction channel and the hydrogen in the raw gas sub-tube are blown out through the gas collecting pipeline, and can be blown out to the outdoors, or blown into the gas collecting device for unified recovery; thereby, it can be avoided that the hydrogen remaining in the raw gas sub-tube and the reaction channel leaks when the de-alkali mist device is replaced.

[0013] Optionally, a differential pressure gauge is further included, and the differential pressure gauge is used to obtain the pressure difference between the de-alkali mist inlet and the de-alkali mist outlet. By setting the differential pressure gauge, the pressure difference between the de-alkali mist inlet and the de-alkali mist outlet of the de-alkali mist device can be detected, thereby judging whether the de-alkali mist device is in an operable working condition.

[0014] Optionally, the deoxygenation system includes a deoxygenation tower, and the raw gas supply pipeline is further provided with a heat exchanger, and the heat exchanger is located between the de-alkali mist device and the deoxygenation tower;

[0015] The heat exchanger has a heat exchange cavity for the raw gas to flow through, and the raw gas performs heat exchange in the heat exchange cavity. The raw gas at the outlet of the de-alkali mist is heated by arranging the heat exchanger, thereby improving the deoxidation efficiency of the raw gas.

[0016] Optionally, it also includes several dryers, regeneration gas exhaust pipelines and regeneration gas supply pipelines;

[0017] The air inlet of each of the dryers can be connected or disconnected with the regeneration gas supply pipeline individually; the exhaust port of each of the dryers can be connected or disconnected with the regeneration gas exhaust pipeline individually; the heat exchanger also includes a heat exchange tube located in the heat exchange cavity;

[0018] The inlet of the heat exchange tube is connected to the regeneration gas supply pipeline, and the outlet of the heat exchange tube is connected to the regeneration gas exhaust pipeline; or, the inlet of the heat exchange tube is connected to the exhaust port of the dryer, and the outlet of the heat exchange tube is connected to the regeneration gas exhaust pipeline.

[0019] In this way, the heat of the regenerated gas can be used to exchange heat with the raw gas in the heat exchange chamber, thereby heating the raw gas to save energy;

[0020] In addition, the regeneration gas in the heat exchange tube can be high-temperature regeneration gas from the regeneration gas supply pipeline, and can also be high-temperature regeneration gas from the regeneration gas exhaust pipeline. Since the temperature of the high-temperature regeneration gas in the regeneration gas supply pipeline is much higher than the temperature of the high-temperature regeneration gas from the regeneration gas exhaust pipeline, the deoxidation tower catalyst can be heated to different degrees. When the regeneration gas in the heat exchange tube comes from the regeneration gas supply pipeline, the raw gas is heated so that the temperature of the raw gas entering the deoxidation tower is higher, thereby having a dehydration effect on the catalyst; thereby, the dehydration operation of the catalyst in the deoxidation tower can be performed online.

[0021] Optionally, the deoxidation tower is provided with a temperature detection device, the deoxidation tower has a raw gas inlet and a deoxidation gas outlet, the raw gas inlet is connected to the raw gas supply pipeline, and the temperature detection device at least detects the temperature of the deoxidation gas outlet. By providing a temperature detection device at the deoxidation gas outlet to at least detect the temperature of the deoxidation gas outlet, it is controlled whether to heat the raw gas entering the deoxidation tower.

[0022] A control method for a hydrogen purification device is applicable to the aforementioned hydrogen purification device, and the control method comprises:

[0023] Step 1: individually determine whether each de-alkali mist device is in an operable working condition;

[0024] Step 11: If yes, connect the corresponding de-alkali mist device to the deoxygenation system;

[0025] Step 121: If not, disconnect the corresponding de-alkali mist device from the raw gas supply system and the deoxygenation system.

[0026] By setting up the alkali mist removal device, the alkali mist removal task of the raw gas is separated from the deoxygenation system, which is beneficial to the long-term removal of alkali mist and prevents the accumulation of alkali mist from affecting the deoxygenation system and subsequent work sections.

[0027] Optionally, it further comprises an air blowing system, one end of which is connected to the raw gas inlet side of the de-alkali mist device, and the other end of which is connected to the raw gas outlet side of the de-alkali mist device;

[0028] After step 121, the control method further includes:

[0029] Step 122: Start the blowing system.

[0030] In this way, leakage of hydrogen remaining in the de-alkali mist device and part of the raw material gas sub-pipe can be avoided, thereby ensuring the safety of the replacement operation of the de-alkali mist device.

[0031] Optionally, the deoxygenation system includes a deoxygenation tower, and the raw gas supply pipeline is further provided with a heat exchanger, and the heat exchanger is located between the de-alkali mist device and the deoxygenation tower;

[0032] The heat exchanger has a heat exchange cavity for the raw gas to flow through, and the raw gas performs heat exchange in the heat exchange cavity;

[0033] It also includes several dryers, regeneration gas exhaust pipelines and regeneration gas supply pipelines;

[0034] The air inlet of each of the dryers can be connected or disconnected with the regeneration gas supply pipeline individually; the exhaust port of each of the dryers can be connected or disconnected with the regeneration gas exhaust pipeline individually; the heat exchanger also includes a heat exchange tube located in the heat exchange cavity; the outlet of the heat exchange tube is connected to the regeneration gas exhaust pipeline, and the inlet of the heat exchange tube is connected to the regeneration gas supply pipeline; or, the inlet of the heat exchange tube is connected to the exhaust port of the dryer;

[0035] The control method of the hydrogen purification device also includes:

[0036] Step 2: determining whether the hydrogen purification device is in a standard operating condition;

[0037] Step 21, if yes, obtain the gas temperature of the deoxygenation outlet, and when the actual temperature is less than the set temperature threshold range, control the inlet of the heat exchange tube to be connected to the exhaust port of the dryer, disconnected from the regeneration gas supply pipeline, and connect the outlet of the heat exchange tube to the regeneration gas exhaust pipeline;

[0038] When the actual temperature is greater than the set temperature threshold range, the inlet of the heat exchange tube is controlled to be disconnected from the exhaust port of the dryer and disconnected from the regeneration gas supply pipeline, and the outlet of the heat exchange tube is disconnected from the regeneration gas exhaust pipeline, and the inlet of the heat exchange tube is controlled to be connected to the exhaust port of the dryer.

[0039] By adopting such a method, the catalyst in the deoxygenation tower can be kept within the temperature threshold of efficient deoxygenation, thereby ensuring the deoxygenation efficiency of the deoxygenation tower.

[0040] Optionally, after step 2, the method further includes:

[0041] Step 22: If not, control the inlet of the heat exchange tube to be disconnected from the exhaust port of the dryer and connected to the regeneration gas supply pipeline, and control the outlet of the heat exchange tube to be connected to the regeneration gas exhaust pipeline.

[0042] In this way, when the hydrogen purification device is in a non-standard operating condition, the temperature of the catalyst in the deoxygenation tower is increased, thereby performing a dehydration operation on the catalyst in the deoxygenation tower to ensure the deoxygenation efficiency of the deoxygenation tower.

[0043] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0045] Figure 1 is a schematic structural diagram of a hydrogen purification device at a certain moment in an embodiment of the present invention;

[0046] Figure 2 It is a partial control method of a hydrogen purification device;

[0047] Figure 3 It is another part of the control method of the hydrogen purification device.

[0048] Reference numerals:

[0049] 1-raw gas supply device; 2-deoxygenation tower; 21-raw gas inlet; 22-deoxygenation outlet; 23-temperature detection device; 3-dealkali mist device; 31-dealkali mist inlet; 32-dealkali mist outlet; 41-raw gas supply pipeline; 411-raw gas sub-pipe; 421-blowing pipeline; 422-gas collecting pipeline; 431-regeneration gas exhaust pipeline; 432-regeneration gas supply pipeline; 433-product gas pipeline; 441-first sub-pipe; 442-second sub-pipe; 443-third sub-pipe; 5-raw gas valve; 6-differential pressure gauge; 7-heat exchanger; 81-dryer in working condition; 82-dryer in regeneration condition; 83-dryer in waiting condition; 91-first gas-liquid separation system; 92-second gas-liquid separation system. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0052] Please refer to Figures 1 to 3 , Figure 1 is a schematic structural diagram of a hydrogen purification device at a certain moment in an embodiment of the present invention; Figure 2 It is a partial control method of a hydrogen purification device; Figure 3 It is another part of the control method of the hydrogen purification device. Figure 1 At the moment shown in , the three dryers are in the regeneration condition, the waiting condition and the working condition from left to right respectively; when the hydrogen purification device is in normal working condition, each dryer will experience the above three conditions in sequence, that is, at different time points, the order of the dryers in each condition will also change. For the convenience of description, this application only shows the flow path diagram of the hydrogen purification device at one moment.

[0053] As shown in the figure, the present invention provides a hydrogen purification device, including a raw material gas supply device, a raw material gas supply pipeline 41 and a deoxygenation system connected to the tail end of the raw material gas supply pipeline 41. The raw material gas supply device can be a water electrolysis device, and the raw material gas supply device is connected to the deoxygenation system through the raw material gas supply pipeline.

[0054] The raw gas supply pipeline 41 is provided with a de-alkali mist device 3, which has a reaction channel, and the reaction channel is used to allow the raw gas to flow, and the raw gas enters the deoxidation system through the de-alkali mist device 3. The reaction channel is provided with an acidic substance, and the alkaline mist in the raw gas reacts with the acidic substance in the reaction channel. In a specific example, the de-alkali mist device 3 can be an activated carbon absorber, which uses a columnar activated carbon filler that is modified by soaking in an acidic liquid.

[0055] By setting up the alkali mist removal device 3, the alkali mist removal task for the raw gas is separated from the deoxygenation system, which is beneficial to the long-term removal of alkali mist and prevents the accumulation of alkali mist from affecting the deoxygenation system and subsequent work sections.

[0056] In a specific embodiment, the raw gas supply pipeline 41 includes at least one raw gas sub-pipe 411, and each raw gas sub-pipe 411 is isolated from each other so that it can be connected or disconnected with the deoxygenation system individually; the dealkali mist device 3 is arranged in the corresponding raw gas sub-pipe 411. In the embodiment in the attached figure, two raw gas sub-pipes 411 and two dealkali mist devices 3 are arranged, and the two dealkali mist devices 3 can be connected or disconnected with the raw gas supply device 1 and the deoxygenation system individually. In this way, the dealkali mist process can be carried out on the raw gas together by multiple dealkali mist devices 3, thereby increasing the dealkali mist efficiency; in addition, it is also convenient to replace the dealkali mist device 3 without stopping for maintenance, which is conducive to the continuous operation of the system.

[0057] As an implementation method, the de-alkali mist device 3 includes a de-alkali mist inlet 31 and a de-alkali mist outlet 32; each raw gas sub-pipe 411 is provided with two raw gas valves 5, one raw gas valve 5 is provided on one side of the de-alkali mist inlet 31, and the other raw gas valve 5 is provided on one side of the de-alkali mist outlet 32. By providing a raw gas valve 5 at each of the de-alkali mist inlet 31 and the de-alkali mist outlet 32 ​​of the de-alkali mist device 3, it is convenient to close the upstream and downstream valves of the corresponding de-alkali mist device 3 during maintenance, so as to facilitate the maintenance and replacement of the de-alkali mist device 3.

[0058] Furthermore, the hydrogen purification device further includes a differential pressure gauge 6, which is used to obtain the pressure difference between the de-alkali mist inlet 31 and the de-alkali mist outlet 32. The differential pressure gauge 6 can be a double bellows differential pressure gauge, a diaphragm differential pressure gauge, and a differential pressure transmitter of a unit combination instrument. By setting the differential pressure gauge 6, the pressure difference between the de-alkali mist inlet 31 and the de-alkali mist outlet 32 ​​of the de-alkali mist device 3 can be detected, so as to determine whether the de-alkali mist device 3 is in an operable working condition. When the pressure difference before and after the activated carbon absorber exceeds a certain set value, it is prompted that the activated carbon needs to be replaced.

[0059] In some optional embodiments, the hydrogen purification device also includes an air blowing system, which includes an air blowing pipeline 421 and an air collecting pipeline 422. One end of the air blowing pipeline 421 is connected to the safety gas supply device, and the safety gas provided by the safety gas supply device is nitrogen; the other end of the air blowing pipeline 421 can be connected or disconnected with each raw gas sub-pipe 411 by setting a valve; one end of the air collecting pipeline 422 can also be connected or disconnected with each raw gas sub-pipe 411 through a valve.

[0060] The other end of the air blowing pipeline 421 is connected to each raw gas sub-pipe 411 at a position between the de-alkali mist inlet 31 and the raw gas valve 5 on the same side, and the gas collecting pipeline 422 is connected to each raw gas sub-pipe 411 at a position between the de-alkali mist outlet 32 ​​and the raw gas valve 5 on the same side. The other end of the gas collecting pipeline 422 can be connected to a gas collecting device, such as a gas compressor, to collect a mixed gas of nitrogen and hydrogen, or it can be connected to the outdoors to achieve the external discharge of hydrogen.

[0061] In the actual working process, after the differential pressure gauge 6 prompts the corresponding de-alkali mist device 3 that needs to be replaced, the raw gas valve 5 of the corresponding raw gas sub-pipe 411 is closed together. At this time, the raw gas no longer enters the section of the flow channel between the two raw gas valves 5, but there is still a part of the raw gas in this section of the flow channel. Before replacing the de-alkali mist device 3, the blowing system is turned on, and the blowing pipeline 421 transports safety gas to the reaction channel of the de-alkali mist device 3 through part of the raw gas sub-pipe 411, so that the hydrogen in the reaction channel and the hydrogen in the raw gas sub-pipe 411 are blown out through the gas collecting pipeline 422, which can be blown out to the outdoors or blown into the gas collecting device for unified recovery; thereby, it is possible to avoid leakage of hydrogen remaining in the raw gas sub-pipe 411 and the reaction channel when the de-alkali mist device 3 is replaced.

[0062] In the above embodiment, the deoxygenation system includes a deoxygenation tower 2, and the raw gas supply pipeline 41 is further provided with a heat exchanger 7, and the heat exchanger 7 is located between the dealkali mist device 3 and the deoxygenation tower 2; the heat exchanger 7 is used to heat the raw gas. The heat exchanger 7 has a heat exchange cavity for the raw gas to flow through, and the raw gas performs heat exchange in the heat exchange cavity. The raw gas at the dealkali mist outlet 32 ​​is heated by the heat exchanger 7, thereby improving the deoxygenation efficiency of the raw gas.

[0063] In another embodiment, the hydrogen purification device further includes a plurality of dryers, a regeneration gas exhaust line 431 and a regeneration gas supply line 432; the air inlet of each dryer can be individually connected to or disconnected from the regeneration gas supply line 432; when the air inlet of the dryer is connected to the regeneration gas supply line 432, the regeneration gas regenerates the dryer; the hydrogen purification device further includes a product gas pipeline, and the air inlet of the regeneration gas supply line 432 is connected to the product gas pipeline, so that part of the product gas can be used to regenerate the dryer 82 in the regeneration condition; it can be understood that the dryer 82 in the regeneration condition is no longer connected to the product gas pipeline, and the air inlet of the dryer 81 in the working condition is connected to the deoxygenation system and is located downstream of the deoxygenation system.

[0064] The exhaust port of each dryer can be individually connected or disconnected with the regeneration gas exhaust pipeline 431; the exhaust port of the dryer 82 in the regeneration condition is connected with the regeneration gas exhaust pipeline 431, and the exhaust port of the dryer 81 in the working condition is connected with the product gas pipeline 433 and disconnected from the regeneration gas exhaust pipeline 431.

[0065] In this embodiment, the heat exchanger 7 further includes a heat exchange tube located in the heat exchange chamber; the inlet of the heat exchange tube is connected to the regeneration gas supply pipeline 432, and the outlet of the heat exchange tube is connected to the regeneration gas exhaust pipeline 431; or, the inlet of the heat exchange tube is connected to the exhaust port of the dryer, and the outlet of the heat exchange tube is connected to the regeneration gas exhaust pipeline 431. In the example shown in the figure, the air inlet side of the heat exchange chamber can be selectively connected to the regeneration gas supply pipeline 432 through the first sub-tube 441; at the same time, the air inlet side can also be selectively connected to the regeneration gas exhaust pipeline 431 through the second sub-tube 442; valves are provided on both the first sub-tube 441 and the second sub-tube 442, and the source pipeline of the heat medium in the heat exchange chamber can be switched by controlling the opening and closing of the valve. That is, when the first sub-tube 441 is connected, the second sub-tube 442 is disconnected, or when the second sub-tube 442 is disconnected, the first sub-tube 441 is disconnected.

[0066] When any one of the first sub-tube 441 and the second sub-tube 442 is connected, the exhaust side of the heat exchange chamber is connected to the regeneration gas exhaust pipeline 431 through the third sub-tube 443 to discharge the heat medium to the regeneration gas exhaust pipeline 431. It can be understood that the position where the second sub-tube 442 is connected to the regeneration gas exhaust pipeline 431 is located upstream of the position where the third sub-tube 443 is connected to the regeneration gas exhaust pipeline 431.

[0067] In this way, the heat of the regenerated gas can be used to exchange heat with the raw gas in the heat exchange chamber, thereby heating the raw gas to save energy;

[0068] In addition, the regeneration gas in the heat exchange tube can be high-temperature regeneration gas from the regeneration gas supply pipeline 432, and can also be high-temperature regeneration gas from the regeneration gas exhaust pipeline 431. Since the temperature of the high-temperature regeneration gas in the regeneration gas supply pipeline 432 is much higher than the temperature of the high-temperature regeneration gas from the regeneration gas exhaust pipeline 431, the catalyst in the deoxygenation tower 2 can be heated to different degrees. When the regeneration gas in the heat exchange tube comes from the regeneration gas supply pipeline 432, the raw gas is heated so that the temperature of the raw gas entering the deoxygenation tower 2 is higher, thereby having a dehydration effect on the catalyst; thereby, the dehydration operation of the catalyst in the deoxygenation tower 2 can be performed online.

[0069] In a specific example, the deoxidation tower 2 has a raw gas inlet 21 and a deoxidation gas outlet 22, and the raw gas inlet 21 is connected to the raw gas supply pipeline 41. The gas temperature in the regeneration gas supply pipeline 432 is about 220°, because a heater is usually provided in the regeneration gas supply pipeline 432 to heat the regeneration gas, thereby improving the regeneration efficiency of the dryer 82 in the regeneration condition, and the position where the inlet of the heat exchange tube is connected to the regeneration gas supply pipeline 432 is located downstream of the heater, so that the regeneration gas with a temperature of about 220° is transported to the heat exchange tube, and then heat is exchanged with the low-temperature raw gas located in the heat exchange chamber through the heat exchange tube to heat the low-temperature raw gas. After this part of the heated low-temperature raw gas enters the deoxidation tower 2, it will cause the water remaining in the catalyst in the deoxidation to evaporate, thereby dehumidifying the catalyst in the deoxidation tower 2. Then, this part of the gas will enter the dryer 81 in working condition through the deoxygenation outlet 22 of the deoxygenation tower 2, and after being dehumidified by the dryer 81 in working condition, it will enter the finished gas pipeline as finished gas.

[0070] Optionally, a first gas-liquid separation system 91 is provided between the deoxygenation outlet 22 and the dryer 81 in working condition, and the second gas-liquid separator system can perform a pre-dehumidification operation on the gas entering the dryer in working condition.

[0071] In the above-mentioned manner, the heat exchange tube is connected to the regeneration gas exhaust pipeline 431, so that in the gas flow direction, part of the regeneration gas will enter the heat exchange tube through the inlet of the heat exchange tube, and then be connected by the outlet of the heat exchange tube. A second gas-liquid separation system 92 is also provided downstream of the outlet of the heat exchange tube; in order to further increase the utilization of the regeneration gas, the regeneration gas exhaust pipeline 431 is also connected to the air inlet of the dryer 83 in the waiting condition, and the second gas-liquid separation system 92 is located between the outlet of the heat exchange tube and the air inlet of the dryer 83 in the waiting condition. This part of the regeneration gas is processed by the dryer 83 in the waiting condition and then discharged into the finished gas pipeline from its exhaust port. The gas-liquid separation system in this application includes a gas-liquid separator, etc., which is a prior art and will not be described here.

[0072] The temperature of the regeneration gas in the regeneration gas exhaust pipeline is related to the process in which the dryer 82 in the regeneration condition is located. Specifically, the dryer 82 in the regeneration condition has a regeneration process and a cold blowing process. In the two processes, the temperature of the regeneration gas discharged from the dryer 82 in the regeneration condition is different, and the approximate range is 40°-150°. In this way, the regeneration gas in the regeneration gas exhaust pipeline 431 is used to heat the raw gas, thereby ensuring that the catalyst is always in a more efficient temperature range.

[0073] The deoxidation tower 2 is provided with a temperature detection device 23. The deoxidation tower 2 has a raw gas inlet 21 and a deoxidation gas outlet 22. The raw gas inlet 21 is connected to the raw gas supply pipeline 41. The temperature detection device 23 at least detects the temperature of the deoxidation gas outlet 22. The temperature detection device 23 is provided at the deoxidation gas outlet 22 to detect at least the temperature of the deoxidation gas outlet 22, thereby controlling whether to heat the raw gas entering the deoxidation tower 2. When the temperature of the deoxidation gas outlet 22 is high, the connection between the heat exchange pipe and the regeneration gas is cut off; when the temperature at this position is low, the connection between the heat exchange pipe and the regeneration gas is opened to heat the raw gas.

[0074] In another aspect of the present application, a control method for a hydrogen purification device is also provided, which is applicable to the aforementioned hydrogen purification device, and the control method includes:

[0075] Step 1: Determine whether each alkali removal mist device 3 is in an operable working condition; wherein the operable working condition means that the alkali removal mist device 3 can continue to react with the alkali mist to remove the alkali mist. The pressure difference result of the differential pressure gauge 6 can be used to determine whether each alkali removal mist device 3 is in an operable working condition.

[0076] Step 11: If yes, connect the corresponding de-alkali mist device 3 to the deoxidation system;

[0077] Step 121: If not, disconnect the corresponding de-alkali mist device 3 from the raw gas supply system and the deoxygenation system.

[0078] In this embodiment, when part of the de-alkali mist device 3 is in a non-operating condition, the de-alkali mist device 3 in an operable condition can be used to perform the de-alkali mist operation without affecting the continuous operation of the system.

[0079] Furthermore, after step 121, the control method further includes:

[0080] Step 122: Turn on the air blowing system.

[0081] In this way, leakage of hydrogen remaining in the de-alkali mist device 3 and part of the raw material gas sub-pipe 411 can be avoided, thereby ensuring the safety of the replacement operation of the de-alkali mist device 3.

[0082] In an optional embodiment, the control method of the hydrogen purification device further includes:

[0083] Step 2: Determine whether the hydrogen purification device is in standard operating conditions; standard operating conditions refer to the conditions where the water content of the catalyst in the deoxygenation tower 2 is in a reasonable range and can maintain a good deoxygenation efficiency. At this time, there is no need to heat the raw gas to a higher temperature to remove water from the catalyst, that is, there is no need to connect the inlet of the heat exchange tube to the regeneration gas supply pipeline 432.

[0084] Step 21, if yes, obtain the gas temperature of the deoxygenated gas outlet 22. When the actual temperature is less than the set temperature threshold range, control the inlet of the heat exchange tube to be connected with the exhaust port of the dryer, disconnected from the regeneration gas supply pipeline 432, and connect the outlet of the heat exchange tube to the regeneration gas exhaust pipeline 431. In this way, the incoming gas enters the heat exchange tube from the exhaust port of the dryer 82 in the regeneration condition, and after heat exchange with the raw gas through the heat exchange tube, it is discharged from the outlet of the heat exchange tube to the subsequent regeneration gas exhaust pipeline 431.

[0085] When the actual temperature is greater than the set temperature threshold range, the inlet of the heat exchange tube is controlled to be disconnected from the exhaust port of the dryer and from the regeneration gas supply pipeline 432, the outlet of the heat exchange tube is disconnected from the regeneration gas exhaust pipeline 431, and the inlet of the heat exchange tube is controlled to be connected to the exhaust port of the dryer.

[0086] By adopting such a method, the catalyst in the deoxidation tower 2 can be kept within the temperature threshold of efficient deoxidation, thereby ensuring the deoxidation efficiency of the deoxidation tower 2. The set temperature threshold range can be set by those skilled in the art. In addition, a temperature detection device 23 can be additionally provided to test the temperature of the catalyst. As an error correction function of the control method, when an error occurs in testing the gas temperature at the deoxidation gas outlet 22, the control logic is corrected by testing the temperature detection device 23 of the catalyst temperature.

[0087] In another embodiment, after step 2, the method further comprises:

[0088] Step 22, if not, the inlet of the heat exchange tube is controlled to be disconnected from the exhaust port of the dryer and connected to the regeneration gas supply pipeline 432, and the outlet of the heat exchange tube is controlled to be connected to the regeneration gas exhaust pipeline 431. At this time, the water content of the catalyst in the deoxidation tower 2 is relatively large, and the raw gas cannot be efficiently deoxidized, so the temperature of the raw gas is increased to dehydrate the catalyst.

[0089] In this way, when the hydrogen purification device is in a non-standard operating condition, the temperature of the catalyst in the deoxygenation tower 2 is increased, thereby performing a dehydration operation on the catalyst in the deoxygenation tower 2 to ensure the deoxygenation efficiency of the deoxygenation tower 2.

[0090] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydrogen purification device, characterized in that: The invention comprises a raw gas supply pipeline (41) and a deoxidation system connected to the tail end of the raw gas supply pipeline (41), wherein the raw gas supply pipeline (41) is provided with a de-alkali mist device (3), and the de-alkali mist device (3) has a reaction channel, wherein the reaction channel is used to allow the raw gas to flow, and an acidic substance is provided in the reaction channel.

2. The hydrogen purification device according to claim 1, characterized in that: The raw gas supply pipeline (41) is divided into a plurality of branches, each of which can be connected to or disconnected from the deoxygenation system independently; the branch is defined as a raw gas sub-pipe (411); and each of the alkali removal mist devices (3) is arranged on a corresponding raw gas sub-pipe (411).

3. The hydrogen purification device according to claim 2, characterized in that: The de-alkali mist device (3) comprises a de-alkali mist inlet (31) and a de-alkali mist outlet (32); each of the raw gas sub-pipes (411) is provided with two raw gas valves (5), one of the raw gas valves (5) is provided on one side of the de-alkali mist inlet (31), and the other of the raw gas valves (5) is provided on one side of the de-alkali mist outlet (32).

4. The hydrogen purification device according to claim 3, characterized in that: It also includes an air blowing system, the air blowing system including an air blowing pipeline (421) and an air collecting pipeline (422), one end of the air blowing pipeline (421) is connected to the safety air supply device, and the other end can be connected to or disconnected from each of the raw gas sub-pipes (411) individually; one end of the air collecting pipeline (422) can be connected to or disconnected from each of the raw gas sub-pipes (411) individually; The position where the other end of the air blowing pipeline (421) is connected to each of the raw gas sub-pipes (411) is located between the de-alkali mist inlet (31) and the raw gas valve (5) on the same side, and the position where the gas collecting pipeline (422) is connected to each of the raw gas sub-pipes (411) is located between the de-alkali mist outlet (32) and the raw gas valve (5) on the same side.

5. The hydrogen purification device according to claim 3, characterized in that: It also includes a differential pressure gauge (6), which is used to obtain the pressure difference between the de-alkali mist inlet (31) and the de-alkali mist outlet (32).

6. The hydrogen purification device according to any one of claims 1 to 5, characterized in that: The deoxygenation system comprises a deoxygenation tower (2), the raw gas supply pipeline (41) is further provided with a heat exchanger (7), and the heat exchanger (7) is located between the de-alkali mist device (3) and the deoxygenation tower (2); The heat exchanger (7) has a heat exchange cavity for the raw gas to flow through, and the raw gas performs heat exchange in the heat exchange cavity.

7. The hydrogen purification device according to claim 6, characterized in that: It also includes a plurality of dryers, a regeneration gas exhaust pipeline (431) and a regeneration gas supply pipeline (432); The air inlet of each dryer can be connected or disconnected with the regeneration gas supply pipeline (432) individually; the exhaust port of each dryer can be connected or disconnected with the regeneration gas exhaust pipeline (431) individually; the heat exchanger (7) further comprises a heat exchange tube located in the heat exchange cavity; The outlet of the heat exchange tube is connected to the regeneration gas exhaust pipeline (431), and the inlet of the heat exchange tube is connected to the regeneration gas supply pipeline (432); or, the inlet of the heat exchange tube is connected to the exhaust port of the dryer.

8. The hydrogen purification device according to claim 7, characterized in that: The deoxidation tower (2) is provided with a temperature detection device (23). The deoxidation tower (2) has a raw gas inlet (21) and a deoxidation gas outlet (22). The raw gas inlet (21) is connected to the raw gas supply pipeline (41). The temperature detection device (23) at least detects the temperature of the deoxidation gas outlet (22).

9. A control method for a hydrogen purification device, characterized in that: Applicable to the hydrogen purification device according to claim 8, the control method comprises: Step 1, individually determining whether each de-alkali mist device (3) is in an operable working condition; Step 11: If yes, connect the corresponding de-alkali mist device (3) to the deoxygenation system; Step 121: If not, disconnect the corresponding de-alkali mist device (3) from the raw gas supply system and the deoxygenation system.

10. The control method of the hydrogen purification device according to claim 9, characterized in that: It also includes an air blowing system, one end of which is connected to the raw gas inlet (21) side of the de-alkali mist device (3), and the other end of which is connected to the raw gas outlet side of the de-alkali mist device (3); After step 121, the control method further includes: Step 122: Start the blowing system.

11. The control method of the hydrogen purification device according to claim 9, characterized in that: The control method of the hydrogen purification device also includes: Step 2: determining whether the hydrogen purification device is in a standard operating condition; Step 21, if yes, obtain the gas temperature of the deoxygenation outlet (22), and when the actual temperature is less than the set temperature threshold range, control the inlet of the heat exchange tube to be connected to the exhaust port of the dryer, disconnect from the regeneration gas supply pipeline (432), and connect the outlet of the heat exchange tube to the regeneration gas exhaust pipeline (431); When the actual temperature is greater than the set temperature threshold range, the inlet of the heat exchange tube is controlled to be disconnected from the exhaust port of the dryer and disconnected from the regeneration gas supply pipeline (432), and the outlet of the heat exchange tube is disconnected from the regeneration gas exhaust pipeline (431), and the inlet of the heat exchange tube is controlled to be connected to the exhaust port of the dryer.

12. The control method of the hydrogen purification device according to claim 11, characterized in that: After step 2, the method further includes: Step 22: If not, control the inlet of the heat exchange tube to be disconnected from the exhaust port of the dryer and connected to the regeneration gas supply pipeline (432); control the outlet of the heat exchange tube to be connected to the regeneration gas exhaust pipeline (431).

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