Three-tower circulating hydrogen drying system for hydrogen production by alkaline electrolyzed water

Abstract

The utility model relates to the technical field of hydrogen production by alkaline electrolyzed water, in particular to a three-tower circulating hydrogen drying system for hydrogen production by alkaline electrolyzed water, which comprises three drying towers filled with molecular sieves; the first condenser is used for positively inputting hydrogen into one drying tower for drying; the regeneration loop is respectively communicated with the outputs of the three drying towers and is used for reversely inputting part of dried hydrogen into the other drying tower to regenerate the molecular sieve; and the two ends of the second condenser communicate with the input ends of the three drying towers correspondingly, and the second condenser receives the regenerated hydrogen and inputs the regenerated hydrogen into the last drying tower for drying. According to the molecular sieve regeneration system, the three drying towers are arranged, part of dried hydrogen is reversely input into the other drying tower to regenerate the molecular sieve, regeneration gas is dried by the drying towers again to achieve zero waste of hydrogen, and the system has the advantages of being easy and convenient to operate and free of hydrogen waste.

Description

Technical Field

[0001] This utility model relates to the field of alkaline water electrolysis hydrogen production technology, and in particular to a three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production. Background Technology

[0002] Since the "dual carbon" target was proposed, my country's hydrogen energy industry has seen a surge in popularity and entered a period of rapid development. Currently, the world's main hydrogen production method is fossil fuel-based, accounting for about 75%. However, this method generates CO2 emissions, exacerbating the environmental carbon emissions problem. Hydrogen production through water electrolysis driven by renewable energy sources (such as wind and solar power) is carbon-free. Under the "dual carbon" target, water electrolysis is considered the most promising and cleanest hydrogen production method.

[0003] Currently, the commercially available methods for producing hydrogen through water electrolysis include: alkaline water electrolysis (ALK), proton exchange membrane (PEM) water electrolysis, and solid oxide electrolysis (SOEC). The first two methods are already commercialized, while the third is currently in the laboratory testing phase. Alkaline water electrolysis technology has been developed for a longer period and boasts advantages such as high technological maturity, low cost, lower water quality requirements, large-scale hydrogen production capacity, and suitability for large-scale applications, making it the most mainstream method for producing hydrogen through water electrolysis. Traditional alkaline water electrolysis systems, however, suffer from drawbacks such as low hydrogen purity, hydrogen waste, and complex processes. Utility Model Content

[0004] This invention provides a three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production, thereby effectively solving the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production, comprising:

[0006] Three drying towers, each filled with molecular sieves;

[0007] A first condenser is used to forward-input hydrogen into one of the drying towers for drying;

[0008] A regeneration loop is provided, which is connected to the outputs of the three drying towers respectively, and a portion of the dried hydrogen is reverse-input into another drying tower to regenerate the molecular sieve.

[0009] The second condenser is connected to the inputs of the three drying towers at both ends. The second condenser receives the regenerated hydrogen and inputs it into the last drying tower for drying.

[0010] Furthermore, during operation, the three drying towers consist of one main drying tower, one regeneration drying tower, and one auxiliary drying tower.

[0011] The first condenser inputs hydrogen gas into the drying input terminal of the main drying tower. A portion of the dried hydrogen gas output from the main drying tower is input into the drying output terminal of the regeneration drying tower, and then enters the second condenser from the drying input terminal of the regeneration drying tower. The second condenser inputs the hydrogen gas into the drying input terminal of the auxiliary drying tower for drying.

[0012] Furthermore, the regeneration loop includes a first circulation pipe and a second circulation pipe. The first circulation pipe is used to receive the dried hydrogen gas output from the drying tower and input a portion of the dried hydrogen gas into another drying tower as regenerated hydrogen gas.

[0013] The second circulation pipeline is used to receive the dried regenerated hydrogen gas output from the drying tower.

[0014] Furthermore, each of the drying towers is provided with two three-way valves at its output and input ends. The two three-way valves at the input end are used to control which drying tower the hydrogen from the first condenser and the second condenser enters, and the two three-way valves at the output end are used to control whether the output of the drying tower is connected to the first circulation pipeline or the second circulation pipeline, and whether the regenerated hydrogen from the first circulation pipeline is input to the output end of the drying tower.

[0015] Furthermore, a flow regulating valve is provided on the first circulation pipeline, which is used to use a set flow rate of dry hydrogen for molecular sieve regeneration.

[0016] Furthermore, a flow meter is installed on the second circulation pipeline. The flow meter is used to test the dried regenerated hydrogen on the second circulation pipeline and to adjust the set flow rate of the flow regulating valve.

[0017] Furthermore, it also includes a deoxygenation tower and a deoxygenation condenser. After hydrogen is input into the deoxygenation tower and the deoxygenation condenser, it is output to the input end of the first condenser.

[0018] Furthermore, the deoxygenating condenser, the first condenser, and the second condenser are equipped with a circulating cooling water system.

[0019] The beneficial effects of this utility model are as follows: by setting up three drying towers, the regeneration circuit is connected to the output of the three drying towers respectively, and a portion of the dried hydrogen is reverse-input into another drying tower to regenerate the molecular sieve. The two ends of the second condenser are connected to the input of the three drying towers respectively. The second condenser receives the regenerated hydrogen and inputs it into the last drying tower for drying. Furthermore, the regenerated gas is dried again by the drying tower to achieve zero hydrogen waste. This system has the advantages of simple operation and no hydrogen waste. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] like Figure 1 As shown: A three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production, comprising:

[0024] Three drying towers, A6, B7, and C8, are filled with molecular sieves.

[0025] First condenser 4, first condenser 4 is used to feed hydrogen into one of the drying towers for drying;

[0026] The regeneration loop is connected to the outputs of three drying towers A6, B7, and C8, and a portion of the dried hydrogen is reverse-input into another drying tower to regenerate the molecular sieve.

[0027] The second condenser 5 is connected to the inputs of the three drying towers at both ends. The second condenser 5 receives the regenerated hydrogen and inputs it into the last drying tower for drying.

[0028] By setting up three drying towers A6, B7, and C8, the regeneration circuit is connected to the output of each of the three drying towers. A portion of the dried hydrogen is then reverse-flowed into another drying tower to regenerate the molecular sieve. The two ends of the second condenser 5 are connected to the inputs of the three drying towers respectively. The second condenser 5 receives the regenerated hydrogen and inputs it into the last drying tower for drying. Furthermore, the regenerated gas is dried again in the drying tower to achieve zero hydrogen waste. This system has the advantages of simple operation and no hydrogen waste.

[0029] During operation, the three drying towers consist of one main drying tower, one regeneration drying tower, and one auxiliary drying tower.

[0030] The first condenser 4 inputs hydrogen into the drying input end of the main drying tower. Part of the dried hydrogen output from the main drying tower is input into the drying output end of the regeneration drying tower, and then enters the second condenser 5 from the drying input end of the regeneration drying tower. The second condenser 5 inputs hydrogen into the drying input end of the auxiliary drying tower for drying.

[0031] The regeneration loop includes a first circulation pipe and a second circulation pipe. The first circulation pipe is used to receive the dried hydrogen output from the drying tower and input a portion of the dried hydrogen into another drying tower as regenerated hydrogen.

[0032] The second circulation pipeline is used to receive the dried regenerated hydrogen output from the drying tower.

[0033] Each drying tower is equipped with two three-way valves at its output and input ends. The two three-way valves at the input end are used to control which drying tower the hydrogen from the first condenser and the second condenser enters, and the two three-way valves at the output end are used to control whether the output of the drying tower is connected to the first circulation pipeline or the second circulation pipeline, and whether the regenerated hydrogen from the first circulation pipeline is input to the output end of the drying tower.

[0034] The first circulation pipeline is equipped with a flow regulating valve LV1001, which is used to use a set flow rate of dry hydrogen for molecular sieve regeneration.

[0035] A flow meter FI1001 is installed on the second circulation pipeline. The flow meter FI1001 is used to test the dried regenerated hydrogen on the second circulation pipeline and to adjust the set flow of the flow regulating valve LV1001.

[0036] As a preferred embodiment of the above, it also includes a deoxygenation tower 2 and a deoxygenation condenser 3. After hydrogen is input into the deoxygenation tower 2 and the deoxygenation condenser 3, it is output to the input end of the first condenser 4.

[0037] Among them, the deoxygenating condenser 3, the first condenser 4, and the second condenser 5 are equipped with a circulating cooling water system.

[0038] The following combination Figure 1 Describe the drying tower cycle in specific operations. For example... Figure 1The illustrated alkaline water electrolysis hydrogen production three-tower circulating hydrogen drying system includes a hydrogen inlet main 1, a deoxygenation tower 2, a deoxygenation condenser 3, a first condenser 4, a second condenser 5, drying towers A6, B7, and C8, a first circulating hydrogen drying pipeline 12, a second circulating hydrogen drying pipeline 13, a third circulating hydrogen drying pipeline 14, a first circulating hydrogen outlet pipeline 15, a second circulating hydrogen outlet pipeline 16, and a hydrogen outlet main 20. The outlet of the hydrogen inlet main 1 is connected to the inlet of the hydrogen deoxygenation tower 2, and the outlet of the hydrogen deoxygenation tower 2 is connected to the inlet of the deoxygenation condenser 3 via a pipeline. The outlet of the deoxygenation condenser 3 is connected to the inlet of the first condenser 4 via a pipeline. The hydrogen output from the first condenser 4 passes through the hydrogen circulation pipeline, the drying tower, and the hydrogen outlet circulation pipeline, and is sent to the downstream user after passing purity testing by a hydrogen analyzer.

[0039] Hydrogen generated by electrolysis in an alkaline electrolyzer passes through a hydrogen separator and a cooler. After gas-water separation, it is transferred to the deoxygenation tower 2 via the hydrogen input main pipe 1. In the deoxygenation tower 2, it undergoes deoxygenation and is output from the outlet of the deoxygenation tower 2. It then passes through the first filter R1001 and is transported to the deoxygenation condenser 3. In the deoxygenation condenser 3, hydrogen and chilled water exchange heat, initially removing some of the moisture contained in the hydrogen. The hydrogen is then transported from the outlet of the deoxygenation condenser 3 to the inlet of the first condenser 4. The input of hydrogen is controlled by the third solenoid valve DF1003. Electric heaters are installed in drying towers A6, B7, and C8 to provide the heat required for the regeneration of the molecular sieves within the drying towers. Two temperature sensors are installed on each drying tower to monitor the temperature at the inlet and outlet of the drying tower in real time and transmit the data to the control terminal.

[0040] The hydrogen drying process of the three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production is divided into three stages.

[0041] Phase 1: At this stage, drying tower A6 is the main drying tower, drying tower B7 is the regeneration drying tower, and drying tower C8 is the auxiliary drying tower. Hydrogen gas is then transported from the outlet of the first condenser 4 to the first hydrogen drying circulation pipeline 12. The first solenoid valve DF1005A of drying tower A6 is open, the first solenoid valve DF1005B of drying tower B7 is closed, and the first solenoid valve DF1005C of drying tower C8 is closed. The hydrogen gas then proceeds to drying tower A6 for adsorption drying. The hydrogen gas dried in drying tower A6 then passes through the first three-way valve MF1001A and the second three-way valve MF1002A of drying tower A6 in the first circulation pipeline at the hydrogen outlet. Pipeline 15 is divided into several channels. Most of the hydrogen is delivered to the downstream user via the main hydrogen outlet pipe. A small portion is delivered to dryer B7 via flow regulating valve LV1001 and the first three-way valve MF1001B of dryer B7. The regenerated hydrogen is then delivered to the second condenser 5 for cooling via the second circulation pipeline 13. At this time, the second solenoid valve DF1006A of dryer A6 is closed, the second solenoid valve DF1006B of dryer B7 is open, and the second solenoid valve DF1006C of dryer C8 is closed. After cooling, the regenerated hydrogen is delivered to dryer C8 via the lower outlet of the second condenser 5 and the third circulation pipeline 14. At this time, the third solenoid valve DF1007A of dryer A6 is closed, the third solenoid valve DF1007B of dryer B7 is closed, and the third solenoid valve DF1007C of dryer C8 is open. After being dried in drying tower C8, the regenerated hydrogen is transported to the second circulation pipeline 16 at the hydrogen outlet via the first three-way valve MF1001C and the second three-way valve MF1002C of drying tower C8. The flow rate in this pipeline is measured by flow meter FI1001 and sent to the PLC control program, which then controls the flow regulating valve LV1001 to adjust the flow rate of the regenerated hydrogen. Finally, the regenerated hydrogen merges with the dried hydrogen output from drying tower A6 at the hydrogen outlet main pipe 20. The purity of the hydrogen is then determined by a hydrogen analyzer, and if it meets the purity standards, it is transported to the downstream user.

[0042] Phase Two: At this stage, drying tower B7 is the main drying tower, drying tower C8 is the regeneration drying tower, and drying tower A6 is the auxiliary drying tower. Hydrogen gas is then transported from the outlet of the first condenser 4 to the first hydrogen drying circulation pipeline 12. The first solenoid valve DF1005B of drying tower B7 is open, the first solenoid valve DF1005A of drying tower A6 is closed, and the first solenoid valve DF1005C of drying tower C8 is closed. The hydrogen gas then proceeds to drying tower B7 for adsorption drying. The hydrogen gas dried in drying tower B7 then passes through the first three-way valve MF1001B and the second three-way valve MF1002B of drying tower B7 in the first circulation pipeline at the hydrogen outlet. In Route 15, most of the hydrogen is delivered to downstream users via the main hydrogen outlet pipe 20. A small portion is delivered to dryer C8 via flow regulating valve LV1001 and the first three-way valve MF1001C of dryer C8. The regenerated hydrogen is then delivered to the second condenser 5 for cooling via the second circulation pipeline 13 of the hydrogen dryer. At this time, the second solenoid valve DF1006A of dryer A6 is closed, the second solenoid valve DF1006B of dryer B7 is closed, and the second solenoid valve DF1006C of dryer C8 is open. After cooling, the regenerated hydrogen is delivered to dryer A6 via the lower outlet of the second condenser 5 and the third circulation pipeline 14 of the hydrogen dryer. At this time, the third solenoid valve DF1007A of dryer A6 is open, the third solenoid valve DF1007B of dryer B7 is closed, and the third solenoid valve DF1007C of dryer C8 is closed. After being dried in drying tower A6, the regenerated hydrogen is transported to the second circulation pipeline 16 at the hydrogen outlet via the first three-way valve MF1001A and the second three-way valve MF1002A of drying tower A6. The flow rate in this pipeline is measured by flow meter FI1001 and sent to the PLC control program, which then controls the flow regulating valve LV1001 to adjust the flow rate of the regenerated hydrogen. Finally, the regenerated hydrogen merges with the dried hydrogen output from drying tower B7 at the hydrogen outlet main pipe 20. The purity of the hydrogen is then determined by a hydrogen analyzer, and if it meets the purity standards, it is transported to the downstream user.

[0043] Phase 3: At this stage, drying tower C8 is the main drying tower, drying tower A6 is the regeneration drying tower, and drying tower B7 is the auxiliary drying tower. Hydrogen gas is then transported from the outlet of the first condenser 4 to the first hydrogen drying circulation pipeline 12. The first solenoid valve DF1005A of drying tower A6 is closed, the first solenoid valve DF1005B of drying tower B7 is closed, and the first solenoid valve DF1005C of drying tower C8 is open. The hydrogen gas then proceeds to drying tower C8 for adsorption drying. The hydrogen gas dried in drying tower C8 then passes through the first three-way valve MF1001C and the second three-way valve MF1002C of drying tower C8 in the first circulation pipeline at the hydrogen outlet. The hydrogen gas is distributed in two streams. Most of the gas is delivered to downstream users via the main hydrogen outlet pipe 20. A small portion is delivered to drying tower A6 via flow regulating valve LV1001 and the first three-way valve MF1001A. The regenerated hydrogen is then delivered to the second condenser 5 for cooling via the second circulation pipeline 13. At this time, the second solenoid valve DF1006A of drying tower A6 is open, the second solenoid valve DF1006B of drying tower B7 is closed, and the second solenoid valve DF1006C of drying tower C8 is closed. After cooling, the regenerated hydrogen is delivered to drying tower B7 via the lower outlet of the second condenser 5 and the third circulation pipeline 14. At this time, the third solenoid valve DF1007A of drying tower A6 is closed, the third solenoid valve DF1007B of drying tower B7 is open, and the third solenoid valve DF1007C of drying tower C8 is closed. After being dried in drying tower A6, the regenerated hydrogen is transported to the second circulation pipeline 16 at the hydrogen outlet via the first three-way valve MF1001A and the second three-way valve MF1002A of drying tower A6. The flow rate in this pipeline is measured by flow meter FI1001 and sent to the PLC control program, which then controls the flow regulating valve LV1001 to adjust the flow rate of the regenerated hydrogen. Finally, the regenerated hydrogen merges with the dried hydrogen output from drying tower C8 at the hydrogen outlet main pipe 20. The purity of the hydrogen is then determined by a hydrogen analyzer, and if it meets the purity standards, it is transported to the downstream user.

[0044] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production, characterized in that, include: Three drying towers, each filled with molecular sieves; A first condenser is used to forward-input hydrogen into one of the drying towers for drying; A regeneration loop is provided, which is connected to the outputs of the three drying towers respectively, and a portion of the dried hydrogen is reverse-input into another drying tower to regenerate the molecular sieve. The second condenser is connected to the inputs of the three drying towers at both ends. The second condenser receives the regenerated hydrogen and inputs it into the last drying tower for drying.

2. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 1, characterized in that, During operation, the three drying towers consist of one main drying tower, one regeneration drying tower, and one auxiliary drying tower. The first condenser inputs hydrogen gas into the drying input terminal of the main drying tower. A portion of the dried hydrogen gas output from the main drying tower is input into the drying output terminal of the regeneration drying tower, and then enters the second condenser from the drying input terminal of the regeneration drying tower. The second condenser inputs the hydrogen gas into the drying input terminal of the auxiliary drying tower for drying.

3. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 1, characterized in that, The regeneration loop includes a first circulation pipe and a second circulation pipe. The first circulation pipe is used to receive the dried hydrogen gas output from the drying tower and input a portion of the dried hydrogen gas into another drying tower as regenerated hydrogen gas. The second circulation pipeline is used to receive the dried regenerated hydrogen gas output from the drying tower.

4. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 3, characterized in that, Each of the drying towers is equipped with two three-way valves at its output and input ends. The two three-way valves at the input end are used to control which drying tower the hydrogen from the first condenser and the second condenser enters, and the two three-way valves at the output end are used to control whether the output of the drying tower is connected to the first circulation pipeline or the second circulation pipeline, and whether the regenerated hydrogen from the first circulation pipeline is input to the output end of the drying tower.

5. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 3, characterized in that, The first circulation pipeline is equipped with a flow regulating valve, which is used to use a set flow rate of dry hydrogen for molecular sieve regeneration.

6. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 5, characterized in that, A flow meter is installed on the second circulation pipeline. The flow meter is used to test the dried regenerated hydrogen on the second circulation pipeline and to adjust the set flow rate of the flow regulating valve.

7. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 1, characterized in that, It also includes a deoxygenation tower and a deoxygenation condenser. After hydrogen is input into the deoxygenation tower and the deoxygenation condenser, it is output to the input end of the first condenser.

8. The three-tower circulating hydrogen drying system for alkaline water electrolysis hydrogen production according to claim 7, characterized in that, The deoxygenating condenser, the first condenser, and the second condenser are equipped with a circulating cooling water system.

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