Water electrolysis hydrogen production purification cylinder, process system and method

Abstract

A first heating rod peripheral pipe of drying tower equipment coaxially penetrates into a drying tower shell from the top end of the drying tower shell and extends into the inner bottom of the drying tower shell, the lower end of the first heating rod peripheral pipe is open, and a heater mounting flange is arranged at the end, extending out of the drying tower shell, of the upper end of the first heating rod peripheral pipe; the first heater is downwards inserted and mounted in the first heating rod peripheral pipe from the heater mounting flange; a first hydrogen inlet is formed in the position, extending out of the drying tower shell, of the first heating rod peripheral pipe, a hydrogen outlet is formed in the side wall of the top of the drying tower shell, and an annular cavity filled with a drying agent is formed between the first heating rod peripheral pipe and the drying tower shell. The two steps of deoxidation and drying are integrated in one purification cylinder, the structure is compact, and the occupied area is small. In the prior art, a temperature gradient is easily formed in a drying tower to cause large up-down temperature difference; by means of the built-in heater structure, the temperature difference between the upper portion and the lower portion in the drying tower can be more uniform, and temperature control is more accurate and rapid.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen purification and drying, and in particular to a water electrolysis hydrogen production purification cylinder and a process system. Background Art

[0002] The general process of hydrogen production by water electrolysis is: 25-30% potassium hydroxide or sodium hydroxide aqueous solution is used as the electrolyte, and the electrolyzer usually works at 80-90°C. Water is electrolyzed into H2 and O2 in the electrolyzer, and enters the hydrogen and oxygen liquid separators in the gas-liquid post-treatment device together with the un-electrolyzed alkaline solution. The separated gas is then washed and cooled. In the alkaline water electrolysis industry, oxygen is usually not used and is discharged into the atmosphere, while hydrogen is used. However, the hydrogen after the above simple treatment has a high dew point due to its high water content, which cannot meet the subsequent production requirements.

[0003] In order to remove the moisture contained in the hydrogen, it is usually necessary to introduce a purification device, which usually includes a deoxygenation tank for removing trace oxygen contained in the hydrogen, a drying tower for removing the moisture contained in the hydrogen, and a corresponding cooler.

[0004] After the drying tower in the prior art has dried the hydrogen for a period of time, the desiccant inside it needs to be heated and purged for regeneration in order to facilitate the next drying use. When designing the process, an independent heating device will be designed in the process. For example, in the prior art: Application No. 202210212062.3 discloses a hydrogen purification device, method and hydrogen production system, which is provided with a heater 100. The outlet of the heater 100 is connected to the top inlet of the first drying tower 300 and the second drying tower 400. The process heats the crude hydrogen through the heater 100 as a purging medium, and passes it into the drying tower to regenerate the desiccant inside, so that it can be used to output pure hydrogen later.

[0005] There is also application number 202111277993.3, which discloses a hydrogen purification system and method and a water electrolysis hydrogen production system, which is also provided with a heater 5, which heats the diverted dry hydrogen and then sends it into other drying towers to be dried, so as to heat, purge and regenerate the desiccant in the tower.

[0006] In summary, the prior art mostly adopts a design method in which the heater is independently arranged outside the drying tower. The defect is that since the heating device is independently arranged outside, during regeneration, the heated purge hydrogen always enters from one end for purge regeneration, which leads to a huge temperature difference between the upper and lower temperatures inside the drying tower, a large residual temperature, and cannot be controlled, resulting in poor desiccant regeneration effect. Secondly, the heater is set separately from the drying tower, the structure is not compact enough, and the equipment occupies a large area. It is necessary to purchase a variety of different equipment separately, which is costly. In addition, the loads between different equipment must match each other, which requires a lot of design calculations. Users cannot use them directly without calculations. Multi-party procurement also leads to increased procurement costs and increased maintenance costs. In addition, the number of equipment has increased, and the number of pipelines has also increased, which has increased the cost of laying pipelines.

[0007] In view of the above, it is necessary to propose a water electrolysis hydrogen purification cylinder and process system to solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to overcome the defects in the prior art and provide a water electrolysis hydrogen production purification cylinder and process system.

[0009] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a water electrolysis hydrogen production purification cylinder, including a drying tower device and a deoxygenation tank device, and a pipeline connecting the two, the drying tower device includes a drying tower shell, a first heating rod peripheral tube, and a first heater; the first heating rod peripheral tube coaxially penetrates into the interior of the drying tower shell from the top and extends into the inner bottom thereof, the lower end of the first heating rod peripheral tube is open, and the upper end extending out of the drying tower shell is provided with a heater mounting flange, and the first heater is inserted downwardly from the heater mounting flange and installed in the first heating rod peripheral tube; the first heating rod peripheral tube is provided with a first hydrogen inlet at the place where the first heating rod peripheral tube extends out of the drying tower shell, and a hydrogen outlet is provided on the top side wall of the drying tower shell, and an annular cavity filled with a desiccant is formed between the first heating rod peripheral tube and the drying tower shell.

[0010] Furthermore, the deoxygenation tank equipment includes a deoxygenation tank shell, a second placement tube, and a second heater; the second placement tube extends from the upper end of the deoxygenation tank shell into the inner bottom thereof, and its upper end is retained outside the deoxygenation tank shell to form an insertion end for the second heater, and the second heater is inserted into the interior of the deoxygenation tank shell through the second placement tube, and a space filled with a palladium catalyst is formed between the second placement tube and the deoxygenation tank shell; a deoxygenation hydrogen inlet is provided at the upper part of the deoxygenation tank shell, a deoxygenation hydrogen outlet is provided at one side of the lower part, and an inlet and outlet pipe of the palladium catalyst is provided at the other side.

[0011] Furthermore, the drying tower shell is also provided with a packing inlet and a packing outlet for replacing the desiccant inside the drying tower equipment, the packing inlet is a pipeline arranged upwardly inclined, and the packing outlet is a pipeline arranged downwardly inclined; a lower partition net is provided inside the drying tower, the desiccant is filled on the upper part of the lower partition net, and the lower partition net is arranged near the lower side of the root of the packing outlet.

[0012] Furthermore, a gas distribution cavity is formed between the lower partition and the lower head of the drying tower shell. A second hydrogen inlet is vertically arranged at the bottom end of the lower head of the drying tower shell. The second hydrogen inlet extends into the gas distribution cavity and a gas distribution hood is arranged at the upper end thereof. The gas distribution hood is bowl-shaped and buckled on the upper end of the second hydrogen inlet.

[0013] Furthermore, the angle between the pipeline of the filler inlet and the pipeline of the filler outlet and the vertical direction is 30-60°.

[0014] Furthermore, the hydrogen introduced from the water electrolysis hydrogen production electrolyzer is connected to the deoxygenated hydrogen inlet of the deoxygenation tank equipment through a hydrogen inlet pipeline, the deoxygenated hydrogen outlet is connected to the A port of the four-way valve through a hydrogen main pipe, and the B and C ports of the four-way valve are respectively connected to set up two parallel branch roads including a No. 1 transmission pipeline and a No. 2 transmission pipeline, and the No. 1 transmission pipeline and the No. 2 transmission pipeline converge and are connected to the pure hydrogen output pipeline; an intermediate cooler is provided on the hydrogen main pipe, a first drying tower is provided on the No. 1 transmission pipeline, and a second drying tower is provided on the No. 2 transmission pipeline, and a purge pipeline is provided on the pure hydrogen output pipeline branch, and the purge pipeline is connected to the D port of the four-way valve, and a flow control valve is provided on the purge pipeline.

[0015] Furthermore, the hydrogen introduced from the water electrolysis hydrogen production electrolyzer is connected to the deoxygenated hydrogen inlet of the deoxygenation tank equipment through a hydrogen inlet pipeline, and the deoxygenated hydrogen outlet is connected to the first shunt control valve through a hydrogen main pipe, and the first shunt control valve is respectively connected to two parallel branch roads including a No. 1 transmission pipeline and a No. 2 transmission pipeline, and the flow direction of the hydrogen is switched by the first shunt control valve, and the No. 1 transmission pipeline and the No. 2 transmission pipeline converge and are connected to the pure hydrogen output pipeline; an intermediate cooler is provided on the hydrogen main pipe, a first drying tower is provided on the No. 1 transmission pipeline, and a second drying tower is provided on the No. 2 transmission pipeline, and the two transmission pipelines are respectively connected to the second hydrogen inlet of the drying tower equipment and flow out from the hydrogen outlet; The pure hydrogen output pipeline branch is provided with a purge pipeline, and the purge pipeline is connected to the second diversion control valve. The second diversion control valve is connected to two parallel purge branch pipes, and the two purge branch pipes are respectively connected to the first hydrogen inlet of the two drying tower equipment. The purge pipeline is provided with a flow control valve.

[0016] Furthermore, the No. 1 transmission pipeline and the No. 2 transmission pipeline are respectively provided with purge outlet pipelines downstream of the drying tower equipment, and the two purge outlet pipelines are connected to the third diversion control valve to converge into the purge outlet main pipe, and the purge outlet main pipe is connected to the heating coil in the deoxygenation tank equipment for waste heat utilization, and is finally connected to the post-stage treatment device; the purge outlet main pipe is provided with a cross-line pipe crossing the deoxygenation tank equipment, and the cross-line pipe is provided with a cut-off valve, and the purge outlet main pipe is provided with a purge temperature sensor upstream of the cross-line pipe branch.

[0017] Furthermore, the No. 1 transmission pipeline and the No. 2 transmission pipeline are respectively provided with a one-way valve downstream of the purge outlet pipeline, and the flow direction of the one-way valve is one-way flow from the drying tower equipment to the pure hydrogen output pipeline.

[0018] The advantages and beneficial effects of the present invention are as follows: 1. Through the two steps of deoxygenation and drying, impurities such as oxygen and moisture in hydrogen are effectively removed to improve the purity of hydrogen; components such as temperature transmitters and heating wires are used to monitor and control the temperature in the drying tower and deoxygenation tank in real time to ensure the stability and reliability of the purification process; the two steps of deoxygenation and drying are integrated in one purification cylinder, which has a compact structure, small footprint, and is easy to install and maintain.

[0019] 2. In the prior art, the heating device is arranged outside, and the heated hydrogen enters from one end of the drying tower to form a temperature gradient in the drying tower, resulting in a large temperature difference between the upper and lower parts. In this device, the built-in heater structure can make the temperature difference between the upper and lower parts of the drying tower more uniform, and the temperature control is more accurate and fast.

[0020] 3. The system adopts the method of connecting the No. 1 transmission pipeline and the No. 2 transmission pipeline in parallel. The advantage is that when one drying tower is regenerating, the other drying tower can continue to work, ensuring the continuity and reliability of the system.

[0021] 4. A flow control valve is provided on the hydrogen purge pipeline to facilitate control of the hydrogen purge flow entering the two drying towers and the split ratio of purge hydrogen to pure hydrogen. The hydrogen purge volume of the drying tower being regenerated can be effectively and accurately controlled.

[0022] 5. The purged hydrogen enters the deoxidation tank through the heating coil, which can effectively utilize the remaining heat and reduce energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is one of the structural schematic diagrams of the drying tower equipment in the present invention; Figure 2 It is a structural schematic diagram of the deoxidation tank equipment in the present invention; Figure 3 This is the second structural schematic diagram of the drying tower equipment in the present invention; Figure 4This is one of the process flow diagrams of the water electrolysis hydrogen purification cylinder process in the present invention; Figure 5 This is the second schematic diagram of the process system of the water electrolysis hydrogen purification cylinder in the present invention; Figure 6 This is the third structural schematic diagram of the drying tower equipment in the present invention; In the figure: 1, drying tower equipment; 2, deoxygenation tank equipment; 3, drying tower shell; 4, first heating rod peripheral tube; 5, first heater; 6, open; 7, heater mounting flange; 8, first hydrogen inlet; 9, hydrogen outlet; 10, deoxygenation tank shell; 11, second placement tube; 12, second heater; 13, deoxygenated hydrogen inlet; 14, deoxygenated hydrogen outlet; 15, inlet and outlet pipes; 16, packing inlet; 17, packing outlet; 19, lower partition; 20, gas distribution chamber; 21, second hydrogen inlet; 22, gas distribution hood; 23, intercooler; 24, hydrogen inlet pipeline; 25, four-way valve; 26, hydrogen main pipe; 27. No. 1 transmission pipeline; 28. No. 2 transmission pipeline; 29. ​​Pure hydrogen output pipeline; 30. First drying tower; 31. Second drying tower; 32. Purge pipeline; 33. Flow control valve; 34. First diverter control valve; 35. Second diverter control valve; 36. Purge branch pipe; 37. Purge outlet pipeline; 38. Third diverter control valve; 39. Purge outlet main pipe; 40. Heating coil; 41. Post-stage treatment device; 42. Cross-line pipe; 43. Shut-off valve; 44. Purge temperature sensor; 45. One-way valve; 46. Top temperature sensor; 47. Bottom temperature sensor; 48. External heating wire; 49. External insulation layer. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0025] A water electrolysis hydrogen production purification cylinder, such as Figure 1-3 As shown, it includes a drying tower device 1 and a deoxidation tank device 2, and a pipeline connecting the two. The drying tower device 1 includes a drying tower shell 3, a first heating rod peripheral tube 4, and a first heater 5. Figure 1 As shown, the drying tower shell 3 is cylindrical, and a base portion can be provided at the bottom thereof for fixing on a base surface, so that the drying tower is arranged in an upright position; the first heating rod peripheral tube 4 coaxially penetrates the interior of the drying tower shell 3 from the top thereof and extends into the inner bottom thereof, the lower end of the first heating rod peripheral tube 4 is open 6, and the upper end extending out of the drying tower shell 3 is provided with a heater mounting flange 7, as shown in FIG. Figure 1 , 3As shown, the outer tube 4 of the first heating rod is a pipe coaxially arranged with the drying tower shell 3 and arranged inside the drying tower shell. The upper end of the outer tube 4 of the first heating rod is provided with a mounting flange through the upper head of the drying tower shell 3. The first heater 5 is inserted downwardly into the outer tube 4 of the first heating rod by the heater mounting flange 7. During installation, the first heater 5 is inserted therein from the mounting flange end, so that the heating component is modularly arranged, which is convenient for replacement and maintenance when the device is shut down for inspection and maintenance. Compared with the design of arranging a heating device outside the tower in the prior art, the heating component is arranged in the drying tower. The equipment has high integration, modular assembly, and convenient maintenance. In addition, the heating component is arranged inside the drying tower so that the drying tower can be internally heated, and the disadvantage of a large temperature difference between the upper and lower parts of the tower caused by the entry of hot hydrogen from one end of the drying tower when the drying tower equipment 1 is regenerated is avoided.

[0026] The first heating rod peripheral tube 4 extending out of the drying tower shell 3 is provided with a first hydrogen inlet 8, and the top side wall of the drying tower shell 3 is provided with a hydrogen outlet 9. An annular cavity filled with desiccant is formed between the first heating rod peripheral tube 4 and the drying tower shell 3. Figure 1 As shown, the hydrogen raw material to be dried enters the inner side of the first heating rod outer tube 4 from the first hydrogen inlet 8, and the hydrogen moves downward along the first heating rod outer tube 4, reaches the opening 6 at the bottom of the first heating rod outer tube 4, and then flows into the annular cavity filled with desiccant. The hydrogen is dried in the annular cavity and flows back upward, and then flows out of the drying tower equipment 1 from the upper hydrogen outlet 9.

[0027] Furthermore, the drying tower housing 3 is also provided with a packing inlet 16 and a packing outlet 17 for replacing the desiccant inside the drying tower device 1. Figure 1 , 3 As shown, the packing inlet 16 is used to fill the drying tower with desiccant, and the packing outlet 17 facilitates the packing inside the drying tower to flow out from the bottom. When the drying tower device 1 needs to replace the desiccant inside, the two pipes can be opened to replace the desiccant inside. As an improvement, the packing inlet 16 is a pipe set up at an upward tilt, and the packing outlet 17 is a pipe set up at an downward tilt; the two tilted pipes facilitate the entry or outflow of the desiccant, and can also make the replacement of the desiccant more complete and thorough. Furthermore, the angle between the pipe of the packing inlet 16 and the pipe of the packing outlet 17 and the vertical direction is 30-60°, and is preferably set to 45°.

[0028] As another embodiment of the drying tower device 1, Figure 3As shown, a lower partition 19 is provided inside the drying tower, and the desiccant is filled in the upper part of the lower partition 19, and the lower partition 19 is provided at the lower side of the root of the filler outlet 17. A gas distribution cavity 20 is formed between the lower partition 19 and the lower end cap of the drying tower shell 3. Due to the separation of the lower partition 19, the desiccant is lifted up at the lower end cap of the drying tower shell 3, and a cavity is formed on the lower side of the lower partition 19, i.e., the gas distribution cavity 20; a second hydrogen inlet 21 arranged in a vertical direction is provided at the bottom end of the lower end cap of the drying tower shell 3, and the second hydrogen inlet 21 extends into the gas distribution cavity 20, and a gas distribution hood 22 is provided at the upper end thereof, and the gas distribution hood 22 is buckled at the upper end of the second hydrogen inlet 21 in a bowl shape. In the improved embodiment, the original one hydrogen inlet of the drying tower equipment 1 is changed into two hydrogen inlets, which are used for the entry of hydrogen under different control states respectively; specifically, in the structure with only one hydrogen inlet in the aforementioned implementation, hydrogen enters through the first hydrogen inlet 8 regardless of whether the drying tower is in a drying working state or a regenerating working state. In the improved embodiment, there are two hydrogen inlets. When the drying tower equipment 1 is in a drying working state, hydrogen enters from the second hydrogen inlet 21; and when the drying tower equipment 1 is in a regeneration working state, it enters from the first hydrogen inlet 8. The advantages are: during the drying process, hydrogen enters from the second hydrogen inlet 21, which can reduce the impact on the internal first heater 5, bypass the floor heater and directly enter the annular cavity filled with desiccant. Entering from the second hydrogen inlet 21 can avoid the impact of cold hydrogen on the heating equipment, and the space supported by the lower partition 19 is more conducive to the distribution of purge hydrogen, avoiding the uneven regeneration caused by bias flow. Specifically, after the purge hydrogen enters from the second hydrogen inlet 21, it hits the inverted bowl-shaped gas distribution hood 22 above, forming a uniform distribution of hydrogen, so that the hydrogen overflows from the edges around the gas distribution hood 22, and then can be evenly distributed in the annular cavity filled with desiccant, effectively avoiding bias flow. In the dry state, the first heater 5 is used to heat the hydrogen gas, which then flows upward at the bottom to be heated and dried, as in the previous embodiment.

[0029] like Figure 2As shown, the deoxidation tank equipment 2 includes a deoxidation tank shell 10, a second placement tube 11, and a second heater 12; the second placement tube 11 extends from the upper end of the deoxidation tank shell 10 into the inner bottom thereof, and its upper end is retained outside the deoxidation tank shell 10 to form an insertion end for the second heater 12, which is similar to the arrangement of the first heating rod peripheral tube 4 in the drying tower equipment 1, and the second heater 12 is inserted into the deoxidation tank shell 10 by the second placement tube 11, and a flange for modular installation is provided on the top of the second placement tube 11, so that the second heater 12 can be conveniently withdrawn from the deoxidation tank during maintenance and replacement, and a space filled with a palladium catalyst is formed between the second placement tube 11 and the deoxidation tank shell 10; a deoxidation hydrogen inlet 13 is provided on the upper part of the deoxidation tank shell 10, a deoxidation hydrogen outlet 149 is provided on one side of the lower part, and a palladium catalyst inlet and outlet pipe 15 is provided on the other side. In actual use, the hydrogen from the electrolytic cell for producing hydrogen by electrolysis of water can enter the deoxygenation tank from the deoxygenation hydrogen inlet 13, so that the hydrogen containing water is deoxygenated in the deoxygenation tank and then enters the subsequent intermediate cooler 23 for steam-water separation. Thereafter, the hydrogen enters the drying tower equipment 1 for further adsorption and dehumidification to form product pure hydrogen.

[0030] Furthermore, in order to monitor the temperature inside the drying tower in real time so as to control the temperature within the most appropriate range, such as Figure 3 As shown, a top temperature sensor 46 and a bottom temperature sensor 47 are also provided on the drying tower shell 3. When in use, the temperature inside the drying tower is monitored by the two temperature sensors, and in order to avoid heat loss during regeneration, as shown in FIG. Figure 6 As shown, an external heating wire 48 is wound around the outer wall of the drying tower shell 3 and is wrapped with an outer insulation layer 49 to ensure the uniformity of regeneration heating and the stability of temperature.

[0031] As an implementation method of the process system of this device: like Figure 4As shown, the hydrogen introduced from the water electrolysis hydrogen production electrolyzer is connected to the deoxygenated hydrogen inlet 13 of the deoxygenation tank device 2 through the hydrogen inlet pipeline 24, and the deoxygenated hydrogen outlet 149 is connected to the A port of the four-way valve 25 through the hydrogen main pipe 26. The B and C ports of the four-way valve 25 are respectively connected to set two parallel branch roads including a No. 1 transmission pipeline 27 and a No. 2 transmission pipeline 28. The No. 1 transmission pipeline 27 and the No. 2 transmission pipeline 28 are connected to the pure hydrogen output pipeline 29; the hydrogen main pipe 26 is provided with an intercooler 23, and the ... A first drying tower 30 is provided on the No. 2 transmission pipeline 27, a second drying tower 31 is provided on the No. 2 transmission pipeline 28, a purge pipeline 32 is branched from the pure hydrogen output pipeline 29, the purge pipeline 32 is connected to the D port of the four-way valve 25, a flow control valve 33 is provided on the purge pipeline 32, in actual use, a part of the hydrogen is diverted from the product pure hydrogen for purging and regenerating the drying tower equipment 1, and the flow control valve 33 provided on the purge pipeline 32 can accurately control the flow of hydrogen used for purging.

[0032] The pure hydrogen output pipeline 29 is branched with a purge pipeline 32, and the purge pipeline 32 is connected to a second flow diversion control valve 35. The second flow diversion control valve 35 is connected to two parallel purge branch pipes 36, and the two purge branch pipes 36 are respectively connected to the first hydrogen inlet 8 of the two drying tower devices 1. The purge pipeline 32 is provided with a flow control valve 33. The drying tower in the purge state uses the purge pipeline 32 to purge and regenerate the drying tower.

[0033] Furthermore, the No. 1 transmission pipeline 27 and the No. 2 transmission pipeline 28 are respectively provided with a purge outlet pipeline 37 downstream of the drying tower equipment 1, and the two purge outlet pipelines 37 are connected to the third diversion control valve 38 to converge to the purge outlet main pipe 39, and the purge outlet main pipe 39 is connected to the heating coil 40 entering the deoxidation tank equipment 2 for waste heat utilization, and finally connected to the post-stage treatment device 41; the purge outlet main pipe 39 is provided with a cross-line pipe 42 that crosses the deoxidation tank equipment 2, and the cross-line pipe 42 is provided with a cut-off valve 43 (it can be understood that the purge outlet main pipe 39 is also provided with a control valve downstream of the cross-line pipe 42 to control the flow direction of the purge hydrogen), and the purge outlet main pipe 39 is provided with a purge temperature sensor 44 upstream of the cross-line pipe 42 branch. The No. 1 transmission pipeline 27 and the No. 2 transmission pipeline 28 are respectively provided with a one-way valve 45 downstream of the purge outlet pipeline 37, and the flow direction of the one-way valve 45 is a one-way flow from the drying tower equipment 1 to the pure hydrogen output pipeline 29. In actual use, the drying tower is purged at high temperature when it is purged and regenerated. Specifically, the regeneration temperature of the desiccant in the drying tower equipment 1 is about 150-300°, while in contrast, the operating temperature of the deoxidation tank using palladium catalyst is usually between 50°C and 200°C, so the regeneration temperature of the drying tower is often higher than the operating temperature of the deoxidation tank. Therefore, in this process, the purge outlet manifold 39 is connected to the heating coil 40 in the deoxidation tank equipment 2, and the waste heat of the high-temperature purge hydrogen is effectively utilized, and the hydrogen in the hydrogen inlet pipeline 24 is preheated by the waste heat, thereby reducing the heat load of the second heater 12; it is worth noting that due to the initial stage of purge regeneration, the temperature of the drying tower gradually rises from low temperature, and the hot hydrogen purged is sent to the heating coil 40 only when the temperature of the purge temperature sensor 44 is higher than the temperature in the deoxidation tank equipment 2, otherwise the cross-line pipe 42 is used to bypass the deoxidation tower equipment and directly send it to the post-stage treatment device 41.

[0034] Specifically, Figure 4 As shown, the hydrogen from the electrolyzer is sent to the deoxygenation tank equipment 2 from the hydrogen inlet pipeline 24, and the raw hydrogen after removing impurities enters the intermediate cooler 23 for water vapor separation. The hydrogen enters the A port of the four-way valve 25 in the hydrogen main pipe 26. At this time, the A port is connected with the B port, so that the hydrogen is introduced into the No. 1 transmission pipeline 27, and the first drying tower 30 is used to dry the hydrogen, and the water contained in the hydrogen is adsorbed by the molecular sieve, and then enters the pure hydrogen output pipeline 29 through the post-stage one-way valve 45 and delivers the product.

[0035] During the above process, the other second drying tower 31 is in a regeneration state. The process is that the purge pipeline 32 diverts a part of the product hydrogen flow and controls the purge amount of hydrogen through the flow control valve 33. This part of hydrogen enters the D port of the four-way valve 25. In this state, the D port is connected to the C port, so that the purge hydrogen enters the second drying tower 31 for purging and regeneration. The high-temperature purge hydrogen formed in this process enters the purge outlet main pipe 39 through the third diverter control valve 38. It can be understood that the third diverter control valve 38 is a three-way control valve. At this time, the control is that the purge outlet main pipe 39 is connected to the second drying tower 31. This part of the high-temperature purge hydrogen enters the heating coil 40 for waste heat utilization and is then sent to the post-stage treatment device 41 for treatment. The third diverter control valve 38 can switch between the two drying towers, and the drying tower that is in the regeneration state is connected to the drying tower.

[0036] The two parallel transmission pipelines realize the switching of the states between the two drying towers, that is, one tower is drying and the other tower is regenerating, and the switching is realized by the action of valves such as the four-way valve 25 to achieve continuous production.

[0037] As another embodiment of the process system of this device: like Figure 5 As shown, the hydrogen introduced from the water electrolysis hydrogen production electrolyzer is connected to the deoxygenated hydrogen inlet 13 of the deoxygenation tank device 2 through the hydrogen inlet pipeline 24, and the deoxygenated hydrogen outlet 149 is connected to the first shunt control valve 34 through the hydrogen main pipe 26. The first shunt control valve 34 is respectively connected to two parallel branch roads including a No. 1 transmission pipeline 27 and a No. 2 transmission pipeline 28. The flow direction of the hydrogen is switched by the first shunt control valve 34, and the No. 1 transmission pipeline 27 and the No. 2 transmission pipeline 28 are connected to the pure hydrogen output pipeline 29; the hydrogen main pipe 26 is provided with an intercooler 2 3, the No. 1 transmission pipeline 27 is provided with a first drying tower 30, the No. 2 transmission pipeline 28 is provided with a second drying tower 31, the two transmission pipelines are respectively connected to the second hydrogen inlet 21 of the drying tower device 1 and flow out from the hydrogen outlet 9; the difference between this embodiment and the aforementioned process embodiment is that the drying tower device 1 with two inlets, the first hydrogen inlet 8 and the second hydrogen inlet 21, is used in this embodiment, which has the advantage that the hydrogen can be more evenly distributed when entering the drying tower for drying, avoiding the phenomenon of bias flow. It can be understood that the first diversion control valve 34 and the second diversion control valve 35 are switched at the same time to control the switching operation of the two drying towers between the drying and regeneration states.

[0038] The pure hydrogen output pipeline 29 is branched with a purge pipeline 32, and the purge pipeline 32 is connected to the second diversion control valve 35. The second diversion control valve 35 is connected to two parallel purge branch pipes 36. The two purge branch pipes 36 are respectively connected to the first hydrogen inlet 8 of the two drying tower equipments 1. The purge pipeline 32 is provided with a flow control valve 33. The No. 1 transmission pipeline 27 and the No. 2 transmission pipeline 28 are respectively provided with purge outlet pipelines 37 downstream of the drying tower equipment 1. The two purge outlet pipelines 37 are connected to the third diversion control valve 38 and converge to the purge outlet main pipe 39. The purge outlet main pipe 39 is connected to the heating coil 40 in the deoxidation tank equipment 2 for waste heat utilization, and finally connected to the post-stage treatment device 41; the purge outlet main pipe 39 is provided with a cross-line pipe 42 that crosses the deoxidation tank equipment 2, and the cross-line pipe 42 is provided with a cut-off valve 43. The purge outlet main pipe 39 is provided with a purge temperature sensor 44 upstream of the cross-line pipe 42 branch. The No. 1 transmission pipeline 27 and the No. 2 transmission pipeline 28 are respectively provided with a one-way valve 45 downstream of the purge outlet pipeline 37 , and the flow direction of the one-way valve 45 is a one-way flow from the drying tower equipment 1 to the pure hydrogen output pipeline 29 .

[0039] The principle is the same as that of the aforementioned process system. The hydrogen generated by the electrolyzer enters the first diverter control valve 34 after passing through the deoxidation tower equipment and the intermediate cooler 23. For example, the first diverter control valve 34 switches to control the hydrogen to enter the first drying tower 30 on the left, and the second diverter control valve 35 is the opposite, controlling the purge hydrogen to enter the second drying tower 31 on the right, thereby realizing different control processes of the two drying towers, that is, the left side is in a drying state and the right side is in a purge regeneration state. The drying tower in the dry state on the left dries the hydrogen and then flows upward through the corresponding one-way valve 45 and enters the pure hydrogen output pipeline 29; while the hydrogen in the drying tower in the purge state on the right side flows downward from the corresponding purge outlet pipeline 37 and enters the purge outlet main pipe 39 (a control valve is provided upstream of the one-way valve 45); the waste heat utilization of the purge hydrogen in this embodiment is the same as that in the aforementioned embodiment.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water electrolysis hydrogen production purification cylinder, characterized in that: The invention comprises a drying tower device and a deoxidation tank device, and a pipeline connecting the two. The drying tower device comprises a drying tower shell, a first heating rod peripheral tube, and a first heater. The first heating rod peripheral tube coaxially penetrates into the interior of the drying tower shell from the top end thereof and extends into the inner bottom thereof. The lower end of the first heating rod peripheral tube is open, and the upper end extending out of the drying tower shell is provided with a heater mounting flange. The first heater is inserted downwardly into the first heating rod peripheral tube by the heater mounting flange. The first heating rod peripheral tube extending out of the drying tower shell is provided with a first hydrogen inlet, and the top side wall of the drying tower shell is provided with a hydrogen outlet. An annular cavity filled with a desiccant is formed between the first heating rod peripheral tube and the drying tower shell.

2. A water electrolysis hydrogen purification cylinder according to claim 1, characterized in that: The deoxidation tank equipment comprises a deoxidation tank shell, a second placement tube, and a second heater; the second placement tube extends from the upper end of the deoxidation tank shell into the inner bottom thereof, and the upper end thereof is retained outside the deoxidation tank shell to form an insertion end for the second heater, the second heater is inserted into the interior of the deoxidation tank shell through the second placement tube, and a space filled with a palladium catalyst is formed between the second placement tube and the deoxidation tank shell; a deoxidation hydrogen inlet is provided at the upper part of the deoxidation tank shell, a deoxidation hydrogen outlet is provided at one side of the lower part, and an inlet and outlet pipe of the palladium catalyst is provided at the other side.

3. A water electrolysis hydrogen purification cylinder according to claim 2, characterized in that: The drying tower shell is also provided with a packing inlet and a packing outlet for replacing the desiccant inside the drying tower equipment. The packing inlet is a pipeline arranged upwardly inclined, and the packing outlet is a pipeline arranged downwardly inclined. A lower partition net is provided inside the drying tower, and the desiccant is filled on the upper part of the lower partition net. The lower partition net is arranged near the lower side of the root of the packing outlet.

4. A water electrolysis hydrogen purification cylinder according to claim 3, characterized in that: A gas distribution cavity is formed between the lower partition and the lower head of the drying tower shell. A second hydrogen inlet arranged in a vertical direction is provided at the bottom end of the lower head of the drying tower shell. The second hydrogen inlet extends into the gas distribution cavity, and a gas distribution hood is provided at the upper end thereof. The gas distribution hood is bowl-shaped and buckled at the upper end of the second hydrogen inlet.

5. The water electrolysis hydrogen purification cylinder according to claim 3, characterized in that: The angle between the pipeline of the filler inlet and the pipeline of the filler outlet and the vertical direction is 30-60 degrees.

6. The process system of a water electrolysis hydrogen purification tank according to claim 3, characterized in that: The hydrogen introduced from the water electrolysis hydrogen production electrolyzer is connected to the deoxygenated hydrogen inlet of the deoxygenation tank equipment through the hydrogen inlet pipeline, and the deoxygenated hydrogen outlet is connected to the A port of the four-way valve through the hydrogen main pipe. The B and C ports of the four-way valve are respectively connected to set two parallel branch roads including a No. 1 transmission pipeline and a No. 2 transmission pipeline. The No. 1 transmission pipeline and the No. 2 transmission pipeline converge and are connected to the pure hydrogen output pipeline; an intercooler is provided on the hydrogen main pipe, a first drying tower is provided on the No. 1 transmission pipeline, and a second drying tower is provided on the No. 2 transmission pipeline. A purge pipeline is provided on the branch of the pure hydrogen output pipeline, and the purge pipeline is connected to the D port of the four-way valve, and a flow control valve is provided on the purge pipeline.

7. The process system of a water electrolysis hydrogen purification tank according to claim 4, characterized in that: The hydrogen introduced from the water electrolysis hydrogen production electrolyzer is connected to the deoxygenated hydrogen inlet of the deoxygenation tank equipment through the hydrogen inlet pipeline, and the deoxygenated hydrogen outlet is connected to the first shunt control valve through the hydrogen main pipe. The first shunt control valve is respectively connected to two parallel branch roads including a No. 1 transmission pipeline and a No. 2 transmission pipeline. The flow direction of the hydrogen is switched by the first shunt control valve, and the No. 1 transmission pipeline and the No. 2 transmission pipeline converge and are connected to the pure hydrogen output pipeline; an intermediate cooler is provided on the hydrogen main pipe, a first drying tower is provided on the No. 1 transmission pipeline, and a second drying tower is provided on the No. 2 transmission pipeline. The two transmission pipelines are respectively connected to the second hydrogen inlet of the drying tower equipment and flow out from the hydrogen outlet; The pure hydrogen output pipeline branch is provided with a purge pipeline, and the purge pipeline is connected to the second diversion control valve. The second diversion control valve is connected to two parallel purge branch pipes, and the two purge branch pipes are respectively connected to the first hydrogen inlet of the two drying tower equipment. The purge pipeline is provided with a flow control valve.

8. A process system for producing hydrogen from water by electrolysis according to claim 6 or 7, characterized in that: The No. 1 transmission pipeline and the No. 2 transmission pipeline are respectively provided with purge outlet pipelines downstream of the drying tower equipment. The two purge outlet pipelines are connected to the third diversion control valve to converge into the purge outlet main pipe. The purge outlet main pipe is connected to the heating coil in the deoxygenation tank equipment for waste heat utilization and is finally connected to the post-stage treatment device. The purge outlet main pipe is provided with a cross-line pipe that crosses the deoxygenation tank equipment. The cross-line pipe is provided with a cut-off valve. The purge outlet main pipe is provided with a purge temperature sensor upstream of the cross-line pipe branch.

9. A process system for producing hydrogen from water by electrolysis according to claim 8, characterized in that: The No. 1 transmission pipeline and the No. 2 transmission pipeline are respectively provided with a one-way valve downstream of the purge outlet pipeline, and the flow direction of the one-way valve is a one-way flow from the drying tower equipment to the pure hydrogen output pipeline.

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