Purification system and device for byproduct hydrogen-rich gas in sewage electrolysis treatment

Abstract

The utility model discloses a purification system and device for byproduct hydrogen-rich gas in sewage electrolysis treatment, which comprises a gas-liquid separator, the gas-liquid separator is connected with a spray tower, the spray tower is sequentially communicated with a first desulfurization tower, a second desulfurization tower and an adsorption tower, the adsorption tower is communicated with a buffer storage tank, and the buffer storage tank is connected with a pressure swing adsorption unit through a hydrogen compressor. The pressure swing adsorption unit is communicated with the gas storage tank through a conveying pipe. Hydrogen is introduced into a gas-liquid separator, gas subjected to primary separation and drying is sequentially introduced into a spray tower, a first desulfurization tower, a second desulfurization tower and an adsorption tower for purification treatment and enters a buffer storage tank, and gas in the buffer storage tank is introduced into a pressure swing adsorption unit. The pressure swing adsorption unit realizes purification of hydrogen-rich gas by utilizing a selective adsorption principle of a solid adsorbent on different gas components along with pressure change, and purified hydrogen is guided into a gas storage tank to be stored. The hydrogen-rich gas recycling device has the advantages of being high in practicability and capable of achieving hydrogen-rich gas recycling.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen recovery and purification, in particular to a system and device for purifying by-product hydrogen-rich gas produced by sewage electrolysis treatment. Background Art

[0002] In the process of treating sewage by electrolysis, the by-product hydrogen gas released by the cathode reaction is usually discharged into the atmosphere and dissipated. If the by-product hydrogen gas can be recycled and utilized as a resource, it will produce good hydrogen energy benefits. However, the purity of hydrogen is often far from practical and cannot be used directly. Since the by-product hydrogen-rich gas obtained by sewage electrolysis comes from sewage electrolysis, the by-product hydrogen-rich gas inevitably contains complex impurity components. In addition to water mist and water vapor, it often contains sulfur-containing gases, acidic gases or alkaline gases, volatile organic compounds (VOCs), etc., and the impurity content is also high, resulting in high difficulty in purification technology. At present, there are few reports on the resource purification process of this hydrogen-rich gas, and directly applying high-cost technology for purification will result in high costs and weak feasibility.

[0003] Therefore, it is necessary to design a by-product hydrogen-rich gas purification system and device for sewage electrolysis treatment that is highly practical and can realize the resource utilization of hydrogen-rich gas. Utility Model Content

[0004] The purpose of the present invention is to provide a system and device for purifying hydrogen-rich gas, a by-product of sewage electrolysis treatment, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a system and device for purifying hydrogen-rich gas as a by-product of sewage electrolysis treatment, comprising a gas-liquid separator, wherein an air inlet pipe and an air outlet pipe are penetrated through the side wall of the gas-liquid separator, a reflux pipe is penetrated through the lower end of the gas-liquid separator, the air outlet pipe is connected to a booster fan, the booster fan is connected to a spray tower through an air pipeline, the spray tower is connected to a first desulfurization tower filled with activated carbon-based desulfurizer solid filler through the air pipeline, the first desulfurization tower is connected to a second desulfurization tower filled with catalytic oxidation desulfurizer through the air pipeline, the first desulfurization tower The grids and meshes are fixedly connected in sequence from bottom to top in the second desulfurization tower. The second desulfurization tower is connected to an adsorption tower filled with high-efficiency solid adsorbent filler through a gas pipeline. A buffer storage tank and a pressure swing adsorption unit are fixedly installed on the right side of the adsorption tower. A connecting pipe is provided between the adsorption tower and the buffer storage tank. A one-way valve is provided on the connecting pipe. The side wall of the buffer storage tank is connected to the air inlet end of the hydrogen compressor, and the air outlet end of the hydrogen compressor is connected to the pressure swing adsorption unit. A delivery pipe is fixedly connected to the pressure swing adsorption unit through the hydrogen compressor, and the delivery pipe is connected to several gas storage tanks in sequence.

[0006] According to the above technical solution, a water tank is fixedly connected to the outside of the spray tower, a water pump is fixedly connected to the inside of the water tank, a water spray pipe is fixedly connected to the water pump, and the water spray pipe passes through the side wall of the spray tower, the water spray pipe is fixedly connected to several nozzles, and a receiving filler layer is fixedly connected to the inner wall of the spray tower and below the nozzle.

[0007] According to the above technical solution, a demisting frame filled with water vapor adsorption filler is fixedly connected to the inner wall of the spray tower and located above the spray head.

[0008] According to the above technical solution, inspection holes are provided through the side walls of the first desulfurization tower, the second desulfurization tower and the adsorption tower.

[0009] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention is provided with a gas-liquid separator, and the by-product hydrogen-rich gas in the sewage treatment can be introduced into the gas-liquid separator through the air inlet pipe. The gas-liquid separator separates the water in the hydrogen and returns the water to the sewage treatment process through the reflux pipe. The hydrogen after water separation enters the spray tower through the booster fan. The spray tower can spray alkaline absorption liquid or acidic absorption liquid to respectively treat the acidic or alkaline impurity gas in the hydrogen-rich gas. The hydrogen-rich gas enters the first desulfurization tower and the second desulfurization tower in turn, and the organic sulfur and other sulfur-containing compound gases in the hydrogen-rich gas can be removed. The surface of the grid is provided with a drainage device. The regular through holes can distribute the airflow, and the grid can prevent the desulfurizer from falling. The adsorption tower adsorbs and removes residual water vapor, VOCs and other impurity gases in the hydrogen-rich gas, and then sends the hydrogen-rich gas to the buffer storage tank for storage. The hydrogen compressor then sends the hydrogen into the pressure swing adsorption unit. The pressure swing adsorption unit desorbs the VOCs, O2, N2 and other impurity gases adsorbed by the adsorbent under the action of vacuum and purge, and transports the impurity gases to the sewage treatment system through the gas pipeline for reuse, or sends them to the exhaust gas treatment device for purification or recycling. The purified hydrogen-rich gas enters the gas storage tank through the transmission pipe and the hydrogen compressor for storage. The hydrogen-rich gas produced as a by-product of the sewage electrolysis treatment device during the sewage treatment process is first introduced into a gas-liquid separator. The gas after preliminary separation and drying is successively introduced into a spray tower, a first desulfurization tower, a second desulfurization tower and an adsorption tower for purification treatment, and then enters a buffer storage tank. The gas in the buffer storage tank is then input into a pressure swing adsorption unit through a hydrogen compressor. The pressure swing adsorption unit uses the principle of selective adsorption of different gas components by solid adsorbents as pressure changes to achieve purification of the hydrogen-rich gas. The purified hydrogen is then introduced into a gas storage tank for storage.

[0010] The water tank used can store alkaline absorption liquid or acidic absorption liquid, and the alkaline absorption liquid or acidic absorption liquid is sprayed out in the form of fine droplets through a water pump, a water spray pipe and a nozzle to increase the gas-liquid contact area, thereby realizing the function of the spray tower to remove acidic and alkaline impurity gases. The falling droplets infiltrate the receiving filler layer below, and the pollutants and impurities are absorbed in the rising air flow and the descending absorption liquid.

[0011] The water vapor adsorption filler filled in the demisting frame can adsorb the water vapor in the spray tower, control and reduce the water vapor entering the first desulfurization tower through the gas pipeline.

[0012] The inspection holes used can facilitate the staff to replace the activated carbon desulfurizer solid filler and the catalytic oxidation desulfurizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the overall main structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the spray tower of the utility model;

[0016] Figure 3 This is a schematic diagram of the main structure of the first desulfurization tower of the utility model;

[0017] Figure 4 This is a schematic diagram of the grille and grid structure of the utility model;

[0018] In the figure: 1-gas-liquid separator, 2-air inlet pipe, 3-air outlet pipe, 4-reflux pipe, 5-boost fan, 6-spray tower, 7-first desulfurization tower, 8-second desulfurization tower, 9-grid, 10-grid, 11-adsorption tower, 12-buffer storage tank, 13-pressure swing adsorption unit, 14-connecting pipe, 15-check valve, 16-hydrogen compressor, 17-delivery pipe, 18-gas storage tank, 19-water tank, 20-water pump, 21-spray pipe, 22-spray head, 23-receiving packing layer, 24-demist frame, 25-manhole. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-4The utility model provides a technical solution: a system and device for purifying hydrogen-rich gas produced as a by-product of sewage electrolysis treatment, comprising a gas-liquid separator 1, an air inlet pipe 2 and an air outlet pipe 3 being provided through the side wall of the gas-liquid separator 1, a return pipe 4 being provided through the lower end of the gas-liquid separator 1, the air outlet pipe 3 being connected to a booster fan 5, the booster fan 5 being connected to a spray tower 6 through an air transmission pipeline, the spray tower 6 being capable of spraying alkaline absorption liquid or acidic absorption liquid to respectively remove the acidic or alkaline impurity gas in the hydrogen-rich gas, the spray tower 6 being connected to the air transmission pipeline The pipeline is connected to the first desulfurization tower 7 filled with activated carbon-based desulfurizer solid filler, and the first desulfurization tower 7 is connected to the second desulfurization tower 8 filled with catalytic oxidation desulfurizer through the gas pipeline. The hydrogen-rich gas enters the first desulfurization tower 7 and the second desulfurization tower 8 in sequence, and the organic sulfur and other sulfur-containing compound gases in the hydrogen-rich gas can be removed. The first desulfurization tower 7 and the second desulfurization tower 8 are fixedly connected with grids 9 and grids 10 from bottom to top in sequence. The second desulfurization tower 8 is connected to the adsorption tower 11 filled with high-efficiency solid adsorbent filler through the gas pipeline. The auxiliary tower 11 adsorbs and removes residual water vapor, VOCs and other impurity gases in the hydrogen-rich gas, and then sends the hydrogen-rich gas to the buffer tank 12 for storage. The buffer tank 12 and the pressure swing adsorption unit 13 are fixedly installed on the right side of the adsorption tower 11. A connecting pipe 14 is provided between the adsorption tower 11 and the buffer tank 12. A one-way valve 15 is provided on the connecting pipe 14. The side wall of the buffer tank 12 is connected to the air inlet end of the hydrogen compressor 16, and the air outlet end of the hydrogen compressor 16 is connected to the pressure swing adsorption unit 13. Under the action of vacuum and purge, the adsorption unit 13 desorbs the VOCs, O2, N2 and other impurity gases adsorbed by the adsorbent from the adsorbent, and transports the impurity gases to the sewage treatment system through the gas pipeline for reuse, or sends them to the exhaust gas treatment device for purification or recycling. The pressure swing adsorption unit 13 is fixedly connected to a delivery pipe 17 through a hydrogen compressor 16, and the delivery pipe 17 is connected to several gas storage tanks 18 in turn. The purified hydrogen enters the gas storage tank 18 for storage through the delivery pipe 17 and the hydrogen compressor 16. The hydrogen-rich gas produced as a by-product by the sewage electrolysis treatment device during the sewage treatment process is first introduced into the gas-liquid separator 1, and the gas after preliminary separation and drying is successively introduced into the spray tower 6, the first desulfurization tower 7, the second desulfurization tower 8 and the adsorption tower 11 for purification treatment, and enters the buffer storage tank 12. The gas in the buffer storage tank 12 is then input into the pressure swing adsorption unit 13 through the hydrogen compressor 16. The pressure swing adsorption unit 13 utilizes the principle of selective adsorption of different gas components by solid adsorbents with pressure changes to achieve purification of the hydrogen-rich gas. The purified hydrogen is then introduced into the gas storage tank 18 for storage.

[0021] Specifically, a water tank 19 is fixedly connected to the outside of the spray tower 6, a water pump 20 is fixedly connected to the inside of the water tank 19, a water spray pipe 21 is fixedly connected to the water pump 20, and the water spray pipe 21 passes through the side wall of the spray tower 6, and the water spray pipe 21 is fixedly connected to a number of nozzles 22. A receiving packing layer 23 is fixedly connected to the inner wall of the spray tower 6 and below the nozzle 22.

[0022] The water tank 19 used can store alkaline absorption liquid or acidic absorption liquid, and the alkaline absorption liquid or acidic absorption liquid is sprayed out in the form of fine droplets through the water pump 20, the water spray pipe 21 and the nozzle 22 to increase the gas-liquid contact area, thereby realizing the function of the spray tower 6 to remove acidic or alkaline impurity gases. The falling droplets infiltrate the receiving filler layer 23 below, and the pollutants and impurities are absorbed in the rising air flow and the descending absorption liquid.

[0023] Specifically, a demisting frame 24 filled with water vapor adsorbing filler is fixedly connected to the inner side wall of the spray tower 6 and located above the spray head 22 .

[0024] The water vapor adsorption filler filled in the demisting frame 24 can adsorb the water vapor in the spray tower 6, and control and reduce the water vapor entering the first desulfurization tower 7 through the gas pipeline.

[0025] Specifically, inspection holes 25 are provided through the side walls of the first desulfurization tower 7 , the second desulfurization tower 8 and the adsorption tower 11 .

[0026] The inspection hole 25 can facilitate the staff to replace the activated carbon desulfurization agent solid filler and the catalytic oxidation desulfurization agent.

[0027] Working principle: When in use, the utility model introduces the hydrogen-rich gas, a by-product of sewage treatment, into the gas-liquid separator 1 through the air inlet pipe 2 for gas-liquid separation, and then enters the spray tower 6 through the air outlet pipe 3. The acidic or alkaline impurity gases in the hydrogen-rich gas are removed respectively by spraying alkaline absorption liquid or acidic absorption liquid. The hydrogen-rich gas is purified by the first desulfurization tower 7, the second desulfurization tower 8 and the adsorption tower 11, and then enters the pressure swing adsorption unit 13 through the buffer storage tank 12. By separating the gas components, the purified hydrogen is introduced into the gas storage tank 18 for storage.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A system and device for purifying hydrogen-rich gas produced as a by-product of sewage electrolysis treatment, comprising a gas-liquid separator (1), characterized in that: An air inlet pipe (2) and an air outlet pipe (3) are provided through the side wall of the gas-liquid separator (1), a return pipe (4) is provided through the lower end of the gas-liquid separator (1), the air outlet pipe (3) is connected to a booster fan (5), the booster fan (5) is connected to a spray tower (6) through a gas pipeline, the spray tower (6) is connected to a first desulfurization tower (7) filled with activated carbon-based desulfurizer solid filler through a gas pipeline, the first desulfurization tower (7) is connected to a second desulfurization tower (8) filled with catalytic oxidation desulfurizer through a gas pipeline, the first desulfurization tower (7) and the second desulfurization tower (8) are both fixedly connected with grilles (9) and grids (10) in sequence from bottom to top, the second desulfurization tower (8) is connected to a first desulfurization tower (7) filled with activated carbon-based desulfurizer solid filler through a gas pipeline, The pipeline is connected to an adsorption tower (11) filled with a high-efficiency solid adsorbent filler, a buffer storage tank (12) and a pressure swing adsorption unit (13) are fixedly installed on the right side of the adsorption tower (11), a connecting pipe (14) is provided between the adsorption tower (11) and the buffer storage tank (12), a one-way valve (15) is provided on the connecting pipe (14), the side wall of the buffer storage tank (12) is connected to the air inlet end of the hydrogen compressor (16), the air outlet end of the hydrogen compressor (16) is connected to the pressure swing adsorption unit (13), a delivery pipe (17) is fixedly connected to the pressure swing adsorption unit (13) through the hydrogen compressor (16), and the delivery pipe (17) is connected to a plurality of gas storage tanks (18) in sequence.

2. The system and device for purifying hydrogen-rich gas as a by-product of sewage electrolysis treatment according to claim 1, characterized in that: The outside of the spray tower (6) is fixedly connected to a water tank (19), the inside of the water tank (19) is fixedly connected to a water pump (20), the water pump (20) is fixedly connected to a water spray pipe (21), and the water spray pipe (21) passes through the side wall of the spray tower (6), the water spray pipe (21) is fixedly connected to a plurality of spray heads (22), and a receiving filler layer (23) is fixedly connected to the inner wall of the spray tower (6) and below the spray heads (22).

3. The system and device for purifying hydrogen-rich gas as a by-product of sewage electrolysis treatment according to claim 2, characterized in that: A demisting frame (24) filled with water vapor adsorption filler is fixedly connected to the inner side wall of the spray tower (6) and located above the spray head (22).

4. The system and device for purifying hydrogen-rich gas as a by-product of sewage electrolysis treatment according to claim 3, characterized in that: Inspection holes (25) are provided through the side walls of the first desulfurization tower (7), the second desulfurization tower (8) and the adsorption tower (11).

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