A multi-stage deep washing device for hydrogen production by methanol reforming

Abstract

The application discloses a kind of multistage deep washing device for hydrogen production by methanol reforming, including the washing assembly being arranged in the gas outlet of methanol reforming hydrogen production equipment;Washing assembly includes connecting pipe, converging pipe and multiple washing barrels, one end of connecting pipe is communicated at the gas outlet of methanol reforming hydrogen production equipment, the other end of connecting pipe is connected with washing barrel, and conveying pipe is connected between each washing barrel, and each sequentially communicated conveying pipe and washing barrel forms gas circulation circulation path, converging pipe is provided with inflow pipe, inflow pipe is communicated below each washing barrel, for washing liquid output channel;The application adopts each washing barrel series connection to form step-by-step gas circulation circulation path, washing liquid is contacted with conversion gas in reverse whole domain, and residual methanol is removed in stages, and the outlet gas methanol concentration is stably controlled in PSA adsorbent safety threshold, to solve the problem of adsorbent poisoning and deactivation caused by methanol, to prolong the service life of PSA system.

Description

Technical Field

[0001] This invention relates to the field of methanol steam reforming for hydrogen production technology, specifically a multi-stage deep washing device for methanol reforming for hydrogen production. Background Technology

[0002] In high-end manufacturing fields such as nuclear power, aerospace, and semiconductors, the heat treatment of nuclear power stainless steel has extremely stringent requirements for hydrogen purity, supply stability, and equipment operational reliability, needing to meet 1000 Nm. 3 The core indicators are: hydrogen production capacity per hour, hydrogen purity ≥99.999% (5N), annual operating time ≥8000 hours, and load adjustment range of 20%-110%. Methanol steam reforming for hydrogen production, as the mainstream technology for on-site hydrogen production, has advantages such as readily available raw materials, a simple process, and adaptability to distributed large-scale hydrogen production. It is the preferred solution to meet the high-purity hydrogen requirements of the aforementioned high-end manufacturing scenarios. However, existing methanol reforming hydrogen production technology has significant shortcomings in engineering applications and is difficult to adapt to the stringent operating conditions of nuclear power plants.

[0003] Currently, the pre-purification stage of methanol reforming hydrogen production systems generally uses a simple single-stage washing device, and its main technical problems are: 1. Residual methanol in reforming gas cannot be effectively removed. After methanol enters the downstream pressure swing adsorption (PSA) hydrogen extraction system with the gas flow, it will directly cause PSA adsorbent poisoning and deactivation, resulting in a sharp drop in adsorption capacity and a significant shortening of service life. The system cannot achieve 8,000 hours of long-term maintenance-free stable operation, which seriously restricts the continuity and reliability of hydrogen for the heat treatment of stainless steel in nuclear power plants. Second, conventional single-stage washing can only achieve coarse purification, with low washing efficiency and poor methanol control accuracy. It cannot stably control the methanol concentration in the outlet gas at the PSA adsorbent safety protection threshold of ≤200ppm, making it difficult to block the toxic pathway of methanol to the adsorbent from the source. As a result, the entire hydrogen production system cannot simultaneously achieve the multiple goals of producing hydrogen at a scale of thousands of cubic meters, producing 5N-level high-purity hydrogen, and operating reliably for a long period of time. Third, the existing washing equipment is not optimized for high flow rates of thousands of cubic meters and wide load adjustment conditions of 20%-110%, resulting in poor load adaptability. When operating conditions fluctuate, problems such as washing failure and failure to remove methanol may occur, which cannot meet the stable supply requirements of hydrogen for nuclear power.

[0004] In summary, existing methanol reforming hydrogen production washing and purification technologies suffer from core defects such as incomplete methanol removal, easy poisoning of PSA adsorbents, poor adaptability to wide load ranges, and inability to operate stably over long periods. There is an urgent need to develop a multi-stage deep washing device that can deeply remove methanol, precisely control methanol, adapt to large-scale wide load conditions, and be rigidly integrated, in order to solve industry pain points and meet the stringent requirements of high-end manufacturing fields such as nuclear power and aerospace for the use of 5N high-purity hydrogen. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage deep washing device for methanol reforming to produce hydrogen, which aims to improve the problems of incomplete methanol removal and easy poisoning of PSA adsorbent in existing methanol reforming to produce hydrogen washing and purification technology.

[0006] The present invention is implemented as follows: A multi-stage deep washing device for methanol reforming to produce hydrogen includes a washing assembly installed at the gas outlet of the methanol reforming to produce hydrogen equipment; the washing assembly includes a connecting pipe, a converging pipe and multiple washing tanks, one end of the connecting pipe is connected to the gas outlet of the methanol reforming to produce hydrogen equipment, the other end of the connecting pipe is connected to a washing tank, and each washing tank is connected to a conveying pipe, the conveying pipes and washing tanks connected in sequence form a gas circulation path, and an inflow pipe is provided on the converging pipe, which is connected to the bottom of each washing tank for the washing liquid output channel; A spraying mechanism and a dispersing mechanism are provided inside each of the aforementioned washing tubs. The air inlet pipe of the dispersing mechanism passes through the spraying mechanism and is connected to the gas circulation path. The spray liquid output by the spraying mechanism comes into contact with the flowing gas in the gas circulation path.

[0007] As one embodiment of the present invention, the above-mentioned spraying mechanism further includes two annular pipes distributed vertically and multiple sets of spray pipe groups. The multiple sets of spray pipe groups are evenly distributed and connected to the outside of the two annular pipes, and the vertically distributed spray pipe groups are staggered. The above-mentioned input liquid pipe is connected to the annular pipe.

[0008] As one embodiment of the present invention, a deformable clamp is provided on the inner side of the annular tube, and the above-mentioned air intake pipe passes through the space formed by the two clamps.

[0009] In one embodiment of the present invention, the top of the washing tub is provided as an opening, and a top cover is detachably installed on the top of the washing tub; an annular plate is installed on the outside of the washing tub, and the annular plate is supported on the support ring plate of the connecting pipe.

[0010] As one embodiment of the present invention, a fixed arc plate is provided above the middle of the top cover, and a clamping arc plate is detachably provided on the side of the fixed arc plate. The air intake pipe passes through the space formed by the fixed arc plate and the clamping arc plate.

[0011] As one embodiment of the present invention, an output pipe and a channel are also provided on the top cover; the above-mentioned air inlet pipe and output pipe respectively form gas inlet and outlet channels; the input liquid pipe of the above-mentioned spraying mechanism is provided through the channel, and the input liquid pipe is connected to a spraying liquid source of corresponding concentration through a liquid pump.

[0012] As one embodiment of the present invention, the above-mentioned dispersion mechanism includes a dispersion disk connected to the bottom of the air inlet pipe. The dispersion disk is provided with a plurality of liquid holes through the top and bottom, and a gas chamber is provided inside the dispersion disk. At the same time, a shielding umbrella is connected to the gas chamber through a pipe above it. In addition, the part of the pipe extending into the shielding umbrella is provided with air holes.

[0013] In one embodiment of the present invention, gas flows from the inlet pipe into the gas chamber, and is then dispersed into various pipes. Finally, it is output from the shield and rises to flow into the next washing tank. The washing liquid is output from the spray pipe group and falls to contact with the gas. Then it falls onto the dispersion plate and falls from the liquid hole to the bottom of the washing tank, and finally flows into the collecting pipe.

[0014] In one embodiment of the present invention, a drying mechanism is connected at the end of the gas circulation path. The drying mechanism includes an upper connecting pipe group, a lower connecting pipe group, and three drying chambers distributed vertically. The upper connecting pipe group and the lower connecting pipe group each include a triangular tube and a solenoid valve installed on the triangular tube. The end of the triangular tube is connected to the three drying chambers. The triangular tube of the upper connecting pipe group is connected to the output pipe of a washing tub through a main pipe.

[0015] In one embodiment of the present invention, each of the above-mentioned drying chambers stores a desiccant, and each of the above-mentioned drying chambers includes a chamber body and a chamber cover. The chamber cover is installed at the opening at the top of the chamber body, and an end pipe communicating with a triangular tube is provided at the ends of the chamber body and the chamber cover that are far apart from each other. A connecting frame is installed on the side of one of the above-mentioned washing tubs, and the connecting frame includes three arc-shaped plates that support the drying chambers.

[0016] The beneficial effects of this invention are: 1. This invention sets up multiple washing tanks in series to form a staged gas circulation path. The washing liquid and the converted gas come into countercurrent contact throughout the entire process, removing residual methanol in stages and keeping the methanol concentration in the outlet gas stably controlled within the safe threshold of the PSA adsorbent. Multi-stage countercurrent deep de-alcoholization protects the PSA system: solves the problem of adsorbent poisoning and deactivation caused by methanol, and extends the service life of the PSA system. 2. This invention, by employing a staggered spray pipe assembly in conjunction with a dispersion mechanism equipped with a shielding umbrella, overcomes the problem of uneven airflow distribution in traditional washing devices. After passing through the dispersion plate and shielding umbrella, the gas is forcibly dispersed into a fine bubble stream, forming a three-dimensional countercurrent contact with the spray liquid flowing from bottom to top. This greatly increases the contact area and mass transfer time between the gas and liquid phases, effectively removing high concentrations of carbon dioxide and methanol residues from the reformed gas, and also achieving efficient capture of trace impurities. This improves the purification efficiency of single-stage washing and enhances the purity of the downstream hydrogen. 3. This invention achieves long-term continuous operation by setting up a three-compartment online switching drying system: The drying mechanism adopts a three-compartment modular design and an independent control circuit design for the solenoid valve. When the desiccant in a single compartment is saturated, it can be switched online to the standby compartment without stopping the machine, without having to stop the machine to replace the desiccant, ensuring the continuous operation of the entire purification system throughout the year and meeting the uninterrupted hydrogen requirements of high-end manufacturing. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention, making other features, objects, and characteristics of the invention more apparent. The illustrative embodiments of the invention, along with their descriptions, are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] Figure 1 This is a schematic diagram showing the location of the present invention and the methanol reforming hydrogen production equipment; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the drying mechanism of the present invention; Figure 4 This is a schematic diagram of the drying chamber of the present invention; Figure 5 This is a schematic diagram of the converging tube of the present invention; Figure 6 This is a schematic diagram of the structure of the washing tub, dispersing mechanism, and spraying mechanism of the present invention; Figure 7 This is a first structural schematic diagram of the washing tub of the present invention; Figure 8 This is a schematic diagram of the dispersion mechanism and spraying mechanism of the present invention; Figure 9 This is a schematic diagram of the dispersing mechanism of the present invention; Figure 10 This is a schematic diagram of the spray mechanism of the present invention; Figure 11 This is a schematic diagram of the second structure of the washing tub of the present invention.

[0019] In the diagram: 1. Methanol reforming hydrogen production equipment; 10. Gas outlet; 2. Washing assembly; 21. Converging pipe; 211. Inflow pipe; 22. Connecting pipe; 23. Delivery pipe; 3. Drying mechanism; 31. Lower connecting pipe assembly; 32. Upper connecting pipe assembly; 321. Solenoid valve; 322. Triangular pipe; 323. Main pipe; 33. Drying chamber; 331. Chamber body; 332. Chamber cover; 333. Opening; 334. End pipe; 4. Washing tank; 41. Annular plate; 42. Top cover; 43. Fixed arc plate; 44. Output pipe; 45. Clamping arc plate; 46. Connecting frame; 5. Dispersion mechanism; 5. Dispersion disc; 52. Shielding umbrella; 53. Gas inlet; 55. Liquid inlet; 6. Spraying mechanism; 61. Annular pipe; 62. Spray pipe assembly; 63. Clamping plate; 64. Input liquid pipe. Detailed Implementation

[0020] The following will refer to the appendices in the embodiments of the present invention. Figure 1-11 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up and down, inner side, outer side, end, middle) in the embodiments of the present invention are only used to explain the relative positional relationship, installation method, flow direction, etc. between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "detachable installation," "through-type arrangement," "evenly distributed," and "staggered distribution," etc., should be interpreted broadly. For example, they can refer to flange-sealed connections or welded connections; they can refer to bolt-locked detachable installations or snap-fit ​​connections for quick assembly and disassembly; they can refer to coaxial through-type arrangements or sealed and limited pipework; they can refer to uniformly distributed annular arrangements or radially balanced arrangements; they can refer to staggered vertical distributions or circumferentially staggered full-coverage arrangements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the operational requirements of high-flow-rate deep purification for methanol reforming to hydrogen production.

[0023] To address the technical problems of incomplete single-stage washing and removal of methanol in existing methanol reforming hydrogen production purification systems, resulting in PSA adsorbent poisoning and failure, low washing efficiency, and poor methanol control precision, this invention provides a multi-stage deep washing device for methanol reforming hydrogen production. This device employs multi-stage series countercurrent washing, global airflow dispersion, and online switching drying in three chambers. Multiple washing tanks progressively remove residual methanol, and the online-switchable drying mechanism stably controls the outlet methanol concentration below 200 ppm, protecting the PSA system from the source. It is also adaptable to high-flow-rate, wide-load fluctuation conditions (thousands of standard cubic meters), ensuring continuous and stable operation of the hydrogen production system and meeting the stringent hydrogen requirements of high-end manufacturing fields such as nuclear power and aerospace.

[0024] like Figures 1-10This invention provides a multi-stage deep washing device for methanol reforming to produce hydrogen, including a washing assembly 2 installed at the outlet 10 of the methanol reforming to produce hydrogen equipment 1; the washing assembly 2 includes a connecting pipe 22, a converging pipe 21 and each washing tank 4, one end of the connecting pipe 22 is connected to the outlet of the methanol reforming to produce hydrogen equipment 1, and the other end of the connecting pipe 22 is connected to each washing tank 4, and each washing tank 4 is connected to a conveying pipe 23, and the conveying pipe 23 and the washing tank 4 connected in sequence form a gas circulation path, and an inflow pipe 211 is provided on the converging pipe 21, which is connected to the bottom of each washing tank 4 for the washing liquid output channel; As attached Figure 1-2 As shown, the multi-stage deep washing device for methanol reforming to hydrogen production of the present invention is directly connected to the outlet of the methanol reforming to hydrogen production equipment 1. Its core consists of a washing component 2 and a drying mechanism 3. The washing component 2 is the core of the multi-stage deep purification process, employing multiple washing tanks 4 connected in series to form a gas circulation path, achieving stage-by-stage countercurrent washing and methanol removal. The drying mechanism 3 is a three-compartment modular online switching structure, completing the drying and dehydration of the washed gas, enabling continuous desiccant replacement without stopping the machine, and ensuring long-term continuous operation. The purpose of the washing component 2 of the present invention is to remove residual methanol. Specifically, the washing device 2 mainly includes a washing component 2 installed at the outlet of the methanol reforming to hydrogen production equipment 1. The washing component 2 includes a connecting pipe 22, a converging pipe 21, and multiple washing tanks 4. In this embodiment of the present invention, three washing tanks 4 are provided, each equally spaced on the converging pipe 21.

[0025] Multi-stage countercurrent washing function: The converted gas produced by the methanol reforming hydrogen production equipment 1 enters each washing tank 4 sequentially from the gas outlet 10 through the connecting pipe 22. In each tank, it is diffused throughout by the dispersion mechanism 5. The spraying mechanism 6 outputs washing liquid from top to bottom, which comes into full contact with the rising gas in the opposite direction, removing residual methanol from the gas step by step. The multi-stage series connection ensures thorough alcohol removal, and the outlet methanol concentration is stable at ≤200ppm.

[0026] One end of the connecting pipe 22 is sealed and connected to the outlet of the methanol reforming hydrogen production equipment 1 through a flange, serving as the main input pipeline for raw material gas; the other end of the connecting pipe 22 is branched to each washing tank 4 through a three-way valve. Each washing tank 4 is evenly distributed on the outside of the connecting pipe 22, and each washing tank 4 is connected in sequence through the conveying pipe 23 to form a gas flow path. An inflow pipe 211 is provided on the converging pipe 21, which is connected to the bottom of each washing tank 4 to collect and discharge the washing liquid.

[0027] A gas circulation path is formed; the converging pipe 21 is connected to the bottom of all washing tubs 4 through the inflow pipe 211, serving as the total output channel for washing liquid and realizing gas-liquid reverse flow.

[0028] A spraying mechanism 6 and a dispersing mechanism 5 are provided inside each washing tub 4. The air inlet pipe 53 of the dispersing mechanism 5 passes through the spraying mechanism 6 and is connected to the gas circulation path. The spray liquid output by the spraying mechanism 6 comes into contact with the flowing gas in the gas circulation path.

[0029] As attached Figure 2 , Figure 6 , Figure 7 As shown, the washing tub 4 is a cavity used to perform multi-stage washing tasks. The number can be increased or decreased according to purification needs. In this embodiment, three sets are provided. The top of the washing tub 4 is open, and the top of the washing tub 4 is detachably installed with a top cover 42 by bolts, which facilitates internal maintenance and component replacement. An annular plate 41 is welded to the outside of the washing tub 4. The annular plate 41 is supported on the support ring plate of the connecting pipe 22 to realize the suspension installation of the washing tub 4. The installation is stable and the disassembly and assembly are convenient. A fixed arc plate 43 is provided above the middle of the top cover 42. A clamping arc plate 45 is detachably provided on the side of the fixed arc plate 43 by bolts, which forms a clamping hole to fix the air inlet pipe 53. The top cover 42 has an output pipe 44 and a channel. The output pipe 44 is a single-barrel gas outlet, and the channel is used to pass through the input liquid pipe 64 of the spray mechanism 6. A connecting frame 46 is provided on the side of the washing tub 4 at the end of the gas circulation path. Three arc-shaped supports are provided on the connecting frame 46. Each arc-shaped support is used to fix the drying chamber 33 of the drying mechanism 3.

[0030] The air inlet pipe 53 passes through the circular space formed by the fixed arc plate 43 and the clamping arc plate 45, thus fixing the air inlet pipe 53. The top cover 42 is also provided with an output pipe 44 and a channel for pipelines to pass through; the air inlet pipe 53 and the output pipe 44 respectively form the gas inlet and outlet channels; the input liquid pipe 64 of the spray mechanism 6 passes through the channel, and the input liquid pipe 64 is connected to the spray liquid source of the corresponding concentration through a liquid pump.

[0031] As attached Figure 6 , Figure 8 , Figure 9 As shown, the dispersion mechanism 5 is installed inside each washing tub 4. Its core function is to evenly disperse the reformed gas entering the tub, expand the gas-liquid contact area, and avoid airflow deviation that could lead to washing dead zones. The dispersion mechanism 5 includes a dispersion plate 51 connected to the bottom of the air inlet pipe 53. The dispersion plate 51 has multiple liquid holes 55 running vertically through it, and a gas chamber is provided inside the dispersion plate 51 for the washing liquid to fall back. At the same time, an inverted cone-shaped shielding umbrella 52 is connected above the gas chamber through a pipe. In addition, the part of the pipe that extends into the shielding umbrella 52 is provided with air holes 54.

[0032] The air inlet pipe 53 passes through the top cover 42 and extends into the washing tub 4. The bottom is sealed and connected to the dispersion plate 51. The dispersion plate 51 is connected to the shield umbrella 52 through multiple pipes. The pipes extend into the shield umbrella 52 and open the air holes 54. During operation, gas flows from the inlet pipe 53 into the gas chamber, and is then evenly dispersed into various pipes. Finally, it is output from the shielding umbrella 52, rises, and flows into the next washing tank 4. The washing liquid is output from the spray pipe group 62, falls and contacts the gas, then falls onto the dispersion plate 51 and falls from the liquid hole 55 to the bottom of the washing tank 4, finally flowing into the converging pipe 21 to form a uniform gas layer throughout the entire area. The washing liquid penetrates the gas layer and contacts the gas in the opposite direction. The shielding umbrella 52 and the dispersion plate 51 work together to diffuse the gas horizontally and evenly. With the double-layer staggered spray, the gas-liquid contact area is increased several times, completely eliminating washing dead corners and greatly improving the de-alcoholization efficiency.

[0033] As attached Figure 6 , Figure 8 , Figure 10 As shown, the spraying mechanism 6 is installed inside each washing tub 4 and above the dispersing mechanism 5. It employs a double-layered, staggered annular spraying design to achieve full coverage of the washing liquid without dead angles and ensure thorough contact with the gas in the opposite direction. Specifically, the spraying mechanism 6 includes two annular pipes 61 distributed vertically and multiple sets of spray pipe groups 62. The multiple sets of spray pipe groups 62 are evenly distributed and connected to the outside of the two annular pipes 61. The projections of the vertically distributed spray pipe groups 62 on the horizontal plane are staggered; for example, the upper spray pipe group is located in the middle of two adjacent lower spray pipe groups to eliminate spray dead angles. An input liquid pipe 64 is connected to the annular pipes 61 for conveying the washing liquid. A deformable clamping plate 63 is provided inside the annular pipes 61. An air inlet pipe 53 passes through the space formed by the two clamping plates 63. By tightening the fasteners on the clamping plates 63, the height of the spraying mechanism 6 relative to the air inlet pipe 53 can be adjusted and locked.

[0034] The system employs a two-layer annular pipe arrangement 61, with multiple spray pipe groups 62 evenly distributed and connected on the outside of the annular pipe 61. The upper and lower spray pipe groups 62 are staggered to cover the entire cross-section of the washing tub, eliminating spray dead zones. A deformable clamping plate 63 is installed inside the annular pipe 61, and the air inlet pipe 53 passes through the space enclosed by the clamping plate 63, achieving stable positioning of the spray mechanism 6 and the air inlet pipe 53, and adapting to different pipe diameters. The liquid input pipe 64 passes through the channel of the top cover 42 and is connected to the annular pipe 61, connecting to an external liquid pump and washing liquid source, which can deliver washing liquid of different concentrations according to purification requirements.

[0035] As attached Figure 2 , Figure 3 , Figure 4 As shown, the drying mechanism 3 is sealed and connected at the end of the gas circulation path. Its core function is to remove moisture from the washed gas. It adopts a three-compartment online switching design to achieve desiccant replacement without stopping the machine, ensuring 8000 hours of continuous operation. Specifically, it includes a lower connecting pipe assembly 31, an upper connecting pipe assembly 32, and three drying chambers 33. The upper connecting pipe assembly 32 and the lower connecting pipe assembly 31 are symmetrically distributed vertically, each including a triangular pipe 322 and a solenoid valve 321; the three ends of the triangular pipe 322 are respectively connected to the three drying chambers 33, and the solenoid valve 321 independently controls the on / off of each branch, realizing online switching between single-chamber operation and dual-chamber standby; the triangular pipe 322 of the upper connecting pipe assembly 32 is sealed and connected to the output pipe 44 of the end washing tub 4 through the main pipe 323.

[0036] The drying chamber 33 is a modular drying unit, including a chamber body 331, a chamber cover 332, an opening 333, and an end pipe 334. The chamber body 331 is filled with a special desiccant, and the chamber cover 332 is sealed and installed at the opening 333 at the top of the chamber body 331. Both the chamber body 331 and the chamber cover 332 are provided with end pipes 334, which are respectively sealed and connected to the triangular tubes 322 of the lower connecting pipe group 31 and the upper connecting pipe group 32.

[0037] The drying mechanism 3 adopts a three-compartment design, and the branch circuits are independently controlled by solenoid valve 321. When the desiccant in a single compartment is saturated, it can be directly switched to the standby compartment without stopping the machine to replace it, ensuring that the system can run continuously for more than 8,000 hours.

[0038] In this invention, all components that come into contact with the gas and washing liquid are made of 304 stainless steel, which is resistant to high temperature, corrosion and aging, making it suitable for the high temperature and corrosive conditions of methanol reforming to produce hydrogen and ensuring a long service life. The spray pipe assembly 62 adopts an anti-clogging large-diameter design, ensuring that there are no blockages or uneven spraying problems during long-term operation.

[0039] The number of washing tanks can be flexibly increased or decreased according to the hydrogen production scale, and it is compatible with a full range of hydrogen production equipment from hundreds to thousands of cubic meters. The multi-stage series structure has low pressure loss and high purification efficiency, which fully meets the 5N-level high-purity hydrogen pre-purification requirements of high-end manufacturing fields such as nuclear power, aerospace, and semiconductors.

[0040] The three-compartment modular design of the drying unit 3 enables the replacement of desiccant to be carried out simultaneously with system operation, completely solving the pain point of traditional drying units requiring shutdown for maintenance and ensuring a continuous and stable supply of hydrogen to the hydrogen production system.

[0041] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other. For example, a flow regulating valve can be added to the input liquid pipe to achieve precise control of the spray volume, an online concentration monitoring module can be added to the washing tub, and a humidity sensor can be added to the drying chamber to achieve automatic switching, etc. However, this must be based on the ability of those skilled in the art to implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-stage deep scrubbing apparatus for methanol reforming to produce hydrogen, characterized in that, The equipment includes a washing assembly (2) installed at the outlet of the methanol reforming hydrogen production equipment (1); the washing assembly (2) includes a connecting pipe (22), a converging pipe (21) and multiple washing tanks (4). One end of the connecting pipe (22) is connected to the outlet (10) of the methanol reforming hydrogen production equipment (1), and the other end of the connecting pipe (22) is connected to the washing tanks (4). Each washing tank (4) is connected to a conveying pipe (23). The conveying pipes (23) and the washing tanks (4) connected in sequence form a gas circulation path. An inflow pipe (211) is provided on the converging pipe (21). The inflow pipe (211) is connected to the bottom of each washing tank (4) and is used as a washing liquid output channel. A spraying mechanism (6) and a dispersing mechanism (5) are provided on the inner side of each of the washing tubs (4). The air inlet pipe (53) of the dispersing mechanism (5) passes through the spraying mechanism (6), and the air inlet pipe (53) is connected to the gas circulation path. The spray liquid output by the spraying mechanism (6) comes into contact with the flowing gas in the gas circulation path. The spraying mechanism (6) also includes two annular pipes (61) distributed vertically and multiple sets of spray pipe groups (62). The multiple sets of spray pipe groups (62) are evenly distributed and connected to the outside of the two annular pipes (61), and the vertically distributed spray pipe groups (62) are staggered. The input liquid pipe (64) is connected to the annular pipes (61). A deformable clamp (63) is provided on the inner side of the annular tube (61), and the air inlet pipe (53) passes through the space formed by the two clamps (63). The dispersion mechanism (5) includes a dispersion plate (51) connected to the bottom of the air inlet pipe (53). The dispersion plate (51) is provided with multiple liquid holes (55) running through it vertically. A gas chamber is provided inside the dispersion plate (51). A shielding umbrella (52) is connected to the gas chamber through a pipe. In addition, the part of the pipe that extends into the shielding umbrella (52) is provided with air holes (54). Gas flows from the inlet pipe (53) to the gas chamber, and is then dispersed to various pipes. Finally, it is output from the shield (52) and flows up to the next washing tank (4). The washing liquid is output from the spray pipe group (62) and falls to contact with the gas. Then it falls on the dispersion plate (51) and falls from the liquid hole (55) to the bottom of the washing tank (4), and finally flows into the converging pipe (21).

2. The multi-stage deep washing device for methanol reforming to produce hydrogen according to claim 1, characterized in that, The washing tub (4) has an opening at the top and a top cover (42) is detachably installed on the top of the washing tub (4); an annular plate (41) is installed on the outside of the washing tub (4) and the annular plate (41) is supported on the support ring plate of the connecting pipe (22).

3. The multi-stage deep washing device for methanol reforming to produce hydrogen according to claim 2, characterized in that, A fixed arc plate (43) is provided above the middle part of the top cover (42), and a clamping arc plate (45) is detachably provided on the side of the fixed arc plate (43). The air inlet pipe (53) passes through the space formed by the fixed arc plate (43) and the clamping arc plate (45).

4. The multi-stage deep washing apparatus for methanol reforming to produce hydrogen according to claim 3, characterized in that, An output pipe (44) and a channel are also provided on the top cover (42); the air inlet pipe (53) and the output pipe (44) respectively form the gas inlet and outlet channels; the input liquid pipe (64) of the spraying mechanism (6) is provided through the channel, and the input liquid pipe (64) is connected to the spraying liquid source of the corresponding concentration through a liquid pump.

5. A multi-stage deep washing apparatus for methanol reforming to produce hydrogen according to claim 1, characterized in that, A drying mechanism (3) is connected at the end of the gas circulation path. The drying mechanism (3) includes an upper connecting pipe group (32), a lower connecting pipe group (31), and three drying chambers (33) distributed vertically. The upper connecting pipe group (32) and the lower connecting pipe group (31) each include a triangular tube (322) and a solenoid valve (321) installed on the triangular tube (322). The end of the triangular tube (322) is connected to the three drying chambers (33). The triangular tube (322) of the upper connecting pipe group (32) is connected to the output pipe (44) of a washing tub (4) through the main pipe (323).

6. A multi-stage deep washing apparatus for methanol reforming to produce hydrogen according to claim 5, characterized in that, Each of the drying chambers (33) contains a desiccant, and each of the drying chambers (33) includes a chamber body (331) and a chamber cover (332). The chamber cover (332) is installed at the opening (333) at the top of the chamber body (331). At the ends of the chamber body (331) and the chamber cover (332) that are far apart from each other, there are end pipes (334) that communicate with the triangular tube (322). A connecting frame (46) is installed on the side of one of the washing tubs (4). The connecting frame (46) includes three arc-shaped plates that support the drying chambers (33).

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