Novel reversible hydrogen charging and discharging purification device

Abstract

The utility model belongs to the field of hydrogen production, and particularly relates to a novel reversible hydrogen charging and discharging purification device. The device is a hydrogen production and charging device and is also a hydrogen desorption power generation device. The device comprises an alkali liquor washer (1), a deoxidation reactor (2), a heat exchanger (3), a separator (4), a drying tower (5), an online analyzer (6) and a product gas three-way valve, in the hydrogen production and charging device, hydrogen from an upstream device is sequentially connected and communicated with an alkali liquor washer (1), a deoxidation reactor (2), a heat exchanger (3), a separator (4), a drying tower (5) and an online analyzer (6) through pipelines; and a gas outlet end pipeline of the online analyzer (6) is communicated with a gas storage device through a product gas three-way valve. According to the reversible hydrogen charging and discharging device, two-in-one is achieved, hydrogen production and charging are changed into hydrogen discharging and power generation through switching of the three-way valve, part of equipment is fully utilized, the purpose of reversible hydrogen charging and discharging is achieved, meanwhile, gas quality and flow are monitored in real time, and equipment investment is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen production and relates to gas purification technology, specifically a novel reversible hydrogen purification device. Background Technology

[0002] Gas purification is a mature and widely used gas treatment technology in hydrogen production, which includes gas-liquid separation, alkaline washing, catalyst deoxygenation, molecular sieve drying, and gas analysis. The gas purification unit processes low-purity hydrogen from upstream units. Through the aforementioned gas purification technology, the hydrogen is processed in a specific sequence, stage by stage, and finally analyzed by a gas analyzer until qualified hydrogen is obtained before being delivered to downstream hydrogen-using units.

[0003] Traditional hydrogen production, purification, storage, and power generation processes are complex, with main equipment including gas-liquid separators, alkaline scrubbers, heat exchangers, deoxygenation towers, drying towers, pressure regulating valves, and control systems. These processes are complex, difficult to operate, and have high maintenance costs.

[0004] Traditional hydrogen purification technology removes water from hydrogen by adsorbing it with molecular sieves, then regenerates it by heating, and finally removes water again after cooling, resulting in a certain amount of water loss. To achieve the functions of "purification-storage-filling" and "hydrogen release-humidification-hydrogen power generation," two independent process flows are required, leading to increased equipment investment and other problems. Utility Model Content

[0005] The purpose of this invention is to solve at least one of the problems existing in the current technology and to provide a novel reversible hydrogen purification device. When used in the hydrogen production and charging stage, this device simplifies the traditional hydrogen purification process and significantly reduces equipment investment. When used in the hydrogen power generation stage, the switching of a three-way valve allows for the reuse of the gas separation equipment, further reducing equipment investment. It also analyzes the water adsorbed in the drying tower during the hydrogen production and charging stage, humidifies the hydrogen, and allows it to enter the downstream hydrogen power generation process, avoiding water waste.

[0006] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0007] A novel reversible hydrogen purification device is disclosed, which serves as both a hydrogen production and charging device and a hydrogen power generation device. The difference lies in the valve switching, which can be achieved using existing technology. This reversible hydrogen purification device includes an alkaline scrubber, a deoxygenation reactor, a heat exchanger, a separator, a drying tower, an online analyzer, and a product gas three-way valve. When hydrogen production and charging are implemented, hydrogen gas (pipeline) from the upstream unit is sequentially connected to the alkaline scrubber, deoxygenation reactor, heat exchanger, separator, drying tower, and online analyzer via pipelines. The outlet pipeline of the online analyzer is connected to a gas storage device via the three-way valve.

[0008] Furthermore, in this device, the deoxygenation reactor is filled with a palladium-platinum catalyst, and the drying tower is filled with a calcium 5A aluminosilicate molecular sieve.

[0009] Because the hydrogen from the upstream unit contains trace amounts of water vapor, oxygen, and alkaline vapor, it is sequentially fed into an alkaline scrubber to remove the alkaline solution and free water. Then, it enters a deoxygenation reactor (temperature controlled at 80-100℃), where, under the action of a palladium-platinum catalyst, the impurities in the hydrogen react with the hydrogen to generate water vapor. The chemical reaction in the deoxygenation reactor is expressed by the equation: 2H₂ + O₂ == H₂O. After removing the impurities, the hydrogen is cooled by a heat exchanger (using 7-12℃ chilled water) and then enters a separator to remove condensate. It then enters a drying tower, where it undergoes deep dehydration through molecular sieve (calcium 5A aluminosilicate) adsorption. Finally, it is automatically detected and measured by online analyzers (water dew point analyzer, micro-oxygen meter) to obtain pure hydrogen product, which is then stored in a gas storage device.

[0010] Preferably, in the novel reversible hydrogen purification device, an alarm device (alarm) is also installed on the online analyzer. The pure hydrogen product is obtained by automatic detection and measurement by the online analyzer (water dew point analyzer, micro-oxygen analyzer). If the hydrogen is substandard, an alarm will sound and the product gas three-way valve will automatically vent the gas. Once the product gas is qualified, the system will automatically return to normal.

[0011] Preferably, in the novel reversible hydrogen purification device, the device further includes a dust filter; the dust filter is installed on the pipeline between the drying tower and the online analyzer; the dust filter is used for dust removal, that is, the hydrogen gas after deep dehydration in the drying tower enters the dust filter for dust removal, and then passes through the online analyzer for detection.

[0012] Preferably, in the novel reversible hydrogen purification device, two bypass lines for the online analyzer are provided next to the online analyzer, and three-way valves are respectively connected to the bypass lines for the online analyzer; and control valves are provided at both the inlet and outlet ends of the online analyzer.

[0013] Preferably, in the novel reversible hydrogen purification device, an alkaline scrubber bypass is provided next to the alkaline scrubber; a pressure transmitter and a temperature transmitter are respectively provided between the hydrogen pipeline from the upstream device and the alkaline scrubber, and control valves are provided at both ends of the pressure transmitter and the temperature transmitter.

[0014] Preferably, in the novel reversible hydrogen purification device, a switch valve is provided at the bottom of both the alkaline scrubber and the separator, through which the water generated in the deoxygenation reactor and the water separated in the separator can be discharged.

[0015] Furthermore, when the novel reversible hydrogen purification device achieves hydrogen emission power generation operation, that is, in the hydrogen emission power generation device, the gas storage device is connected to the online analyzer; the online analyzer is connected to the drying tower, which is equipped with a heating device; the drying tower is connected to the separator; the separator is connected to the heat exchanger; a deoxygenation reactor bypass is set next to the deoxygenation reactor, and the heat exchanger is connected to the hydrogen power generation device through the deoxygenation reactor bypass.

[0016] The hydrogen in the storage unit is connected to the online analyzer via a bypass, and then enters the drying tower. Because the drying tower is equipped with a heating device, the water adsorbed on the molecular sieve during the hydrogen production charging stage is desorbed. The dried hydrogen from the hydrogen release end is then separated by a separator to remove the desorbed water; it is then cooled by a heat exchanger and finally bypassed through a deoxygenation reactor to enter the upstream unit. During heat exchange, the wet hydrogen only needs to be cooled to the temperature required for the power generation unit, without the need for low-temperature cooling and dehydration, thus avoiding a certain amount of water waste and achieving the goal of humidifying the hydrogen and reducing water waste.

[0017] Preferably, in the novel reversible hydrogen purification device, the online analyzer includes a dew point analyzer and a micro-oxygen analyzer; both the dew point analyzer and the micro-oxygen analyzer are connected to pipelines to detect the moisture and oxygen in the hydrogen.

[0018] Preferably, in the novel reversible hydrogen purification device, temperature detection devices are installed at both ends of the heat exchanger to better control the temperature.

[0019] Compared with existing technologies, the beneficial effects of this utility model are:

[0020] (1) In the hydrogen power generation device, the water adsorbed on the molecular sieve during the hydrogen production and charging stage is desorbed by heating the drying tower, and then the desorbed water is carried away by the dried hydrogen gas from the hydrogen release end. This part of wet hydrogen gas only needs to be cooled to the hydrogen temperature used by the power generation device, and does not need to be cooled and dehydrated at low temperature, thereby avoiding a certain amount of water waste and achieving the purpose of humidifying hydrogen gas and reducing water waste.

[0021] (2) The hydrogen production and charging process and the hydrogen release and power generation process are combined into one. By switching the three-way valve, the hydrogen production and charging process is transformed into the hydrogen release and power generation process. This makes full use of some equipment to achieve the purpose of reversible hydrogen charging and discharging. At the same time, the quality and flow rate are monitored in real time, which also reduces equipment investment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the connection relationship of the hydrogen production and charging devices in a novel reversible hydrogen purification device according to this utility model.

[0023] Figure 2 This is a schematic diagram of the connection relationship of a novel reversible hydrogen purification device for hydrogen emission and power generation according to this utility model.

[0024] The markings in the diagram are: 1 – alkaline scrubber, 2 – deoxygenation reactor, 3 – heat exchanger, 4 – separator, 5 – drying tower, and 6 – online analyzer. Detailed Implementation

[0025] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0026] Any feature disclosed in this specification (including the claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0027] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0028] Example 1:

[0029] A novel reversible hydrogen purification device is disclosed. The device is a hydrogen production and charging device, and also a hydrogen emission and power generation device. The difference lies in the valve switching. The installation and switching of the valve can be achieved using existing technology, which will not be elaborated here.

[0030] The reversible hydrogen purification device includes an alkaline scrubber 1, a deoxygenation reactor 2, a heat exchanger 3, a separator 4, a drying tower 5, an online analyzer 6, and a product gas three-way valve. When hydrogen production and charging are achieved, hydrogen gas (pipeline) from the upstream unit is sequentially connected to the alkaline scrubber 1, deoxygenation reactor 2, heat exchanger 3, separator 4, drying tower 5, and online analyzer 6 via pipelines. The outlet pipeline of the online analyzer 6 is connected to a gas storage device via the product gas three-way valve.

[0031] Furthermore, in this device, the deoxygenation reactor is filled with a palladium-platinum catalyst, and the drying tower is filled with a calcium 5A aluminosilicate molecular sieve.

[0032] Because the hydrogen from the upstream unit contains trace amounts of water vapor, oxygen, and alkaline vapor, it is sequentially fed into an alkaline scrubber 1 to remove alkaline solution and free water. Then, it enters a deoxygenation reactor 2 (temperature controlled at 80-100℃), where, under the action of a palladium-platinum catalyst, impurities in the hydrogen react with the hydrogen to generate water vapor. The chemical reaction in deoxygenation reactor 2 is expressed as: 2H₂ + O₂ == H₂O. After removing impurities, the hydrogen is cooled by a heat exchanger 3 (using 7-12℃ chilled water) and then enters a separator 4 to remove condensate. It then enters a drying tower 5, where it undergoes deep dehydration through molecular sieve (calcium 5A aluminosilicate) adsorption. Finally, it is automatically detected and measured by an online analyzer 6 (water dew point analyzer, micro-oxygen meter) to obtain pure hydrogen product, which is stored in a gas storage device through a product gas three-way valve.

[0033] Preferably, in the novel reversible hydrogen purification device, two bypass lines are provided next to the online analyzer 6, and the product gas three-way valves are respectively connected to the bypass lines of the online analyzer 6; and control valves are provided at both the inlet and outlet ends of the online analyzer 6.

[0034] Preferably, in the novel reversible hydrogen purification device, an alkaline scrubber bypass is provided next to the alkaline scrubber 1; a pressure transmitter and a temperature transmitter are respectively provided between the hydrogen pipeline from the upstream device and the alkaline scrubber 1, and control valves are provided at both ends of the pressure transmitter and the temperature transmitter.

[0035] Preferably, in the novel reversible hydrogen purification device, a switch valve is provided at the bottom of both the alkaline scrubber 1 and the separator 4, through which the water generated in the alkaline scrubber 1 and the water separated in the separator 4 can be discharged.

[0036] Example 2:

[0037] Based on Example 1, the novel reversible hydrogen purification device further includes a dust filter; the dust filter is installed on the pipeline between the drying tower 5 and the online analyzer 6; the dust filter is used for dust removal, that is, the hydrogen gas after deep dehydration in the drying tower 5 enters the dust filter for dust removal, and then passes through the online analyzer 6 for detection.

[0038] Example 3:

[0039] Based on Example 1 or Example 2, the novel reversible hydrogen purification device further includes an alarm on the online analyzer. The pure hydrogen product is obtained through automatic detection and measurement by the online analyzer (water dew point analyzer, micro-oxygen analyzer). An alarm will sound if the hydrogen gas is substandard, and the product gas three-way valve will automatically vent the gas. Once the product gas meets the required standard, the device will automatically return to normal operation.

[0040] Example 4:

[0041] A novel reversible hydrogen purification device is provided, based on Example 1 or Example 2. This reversible hydrogen purification device includes an alkaline scrubber 1, a deoxygenation reactor 2, a heat exchanger 3, a separator 4, a drying tower 5, an online analyzer 6, and a product gas three-way valve.

[0042] When the novel reversible hydrogen purification device achieves hydrogen emission and power generation operation, that is, in the hydrogen emission and power generation device, the gas storage device is connected to the online analyzer 6; the online analyzer 6 is connected to the drying tower 5, and the drying tower 5 is equipped with a heating device; the drying tower 5 is connected to the separator 4; the separator 4 is connected to the heat exchanger 3; a deoxygenation reactor bypass is set next to the deoxygenation reactor 2, and the heat exchanger 3 is connected to the hydrogen power generation device through the deoxygenation reactor bypass.

[0043] Hydrogen gas from the storage device is connected to online analyzer 6 via a bypass, and then enters drying tower 5. Since drying tower 5 is equipped with a heating device, the water adsorbed on the molecular sieve during the hydrogen production charging stage is desorbed. The dried hydrogen gas from the hydrogen release end is then separated by separator 4, carrying away the desorbed water. After cooling by heat exchanger 3, it finally bypasses the deoxygenation reactor and enters the upstream unit. During heat exchange in heat exchanger 3, the wet hydrogen gas only needs to be cooled to the temperature required for the power generation unit, without the need for low-temperature cooling and dehydration, thus avoiding a certain amount of water waste and achieving the goal of humidifying hydrogen gas and reducing water waste.

[0044] Preferably, in the novel reversible hydrogen purification device, the online analyzer 6 includes a dew point analyzer and a micro-oxygen analyzer; both the dew point analyzer and the micro-oxygen analyzer are connected to pipelines to detect the moisture and oxygen in the hydrogen.

[0045] Preferably, in the novel reversible hydrogen purification device, temperature detection devices are installed at both ends of the heat exchanger 3 to better control the temperature.

[0046] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

[0047] The background section is provided to generally present the context of this utility model. The work of the currently named utility model owner, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither expressly nor impliedly acknowledged as prior art of this utility model.

Claims

1. A novel reversible hydrogen purification device, characterized in that: The device is a hydrogen production and charging device, and also a hydrogen release and power generation device, the difference being the valve switching; the device includes an alkaline scrubber (1), a deoxygenation reactor (2), a heat exchanger (3), a separator (4), a drying tower (5), an online analyzer (6), and a product gas three-way valve; in the hydrogen production and charging device, hydrogen from the upstream device is connected to the alkaline scrubber (1), the deoxygenation reactor (2), the heat exchanger (3), the separator (4), the drying tower (5), and the online analyzer (6) in sequence through pipelines; the outlet pipeline of the online analyzer (6) is connected to the gas storage device through the product gas three-way valve.

2. The novel reversible hydrogen purification device as described in claim 1, characterized in that: The device also includes a dust filter; the dust filter is installed on the pipeline between the drying tower (5) and the online analyzer (6).

3. The novel reversible hydrogen purification device as described in claim 1, characterized in that: Two bypass lines are set up next to the online analyzer (6), and the product gas three-way valves are connected to the bypass lines of the two online analyzers respectively; control valves are set at both ends of the online analyzer (6).

4. The novel reversible hydrogen purification device as described in claim 1, characterized in that: An alarm device is also installed on the online analyzer (6).

5. The novel reversible hydrogen purification device as described in claim 1, characterized in that: An alkaline scrubber bypass is installed next to the alkaline scrubber (1); a pressure transmitter and a temperature transmitter are respectively installed between the hydrogen pipeline from the upstream unit and the alkaline scrubber (1), and control valves are installed at both ends of the pressure transmitter and the temperature transmitter.

6. The novel reversible hydrogen purification device as described in claim 1, characterized in that: Switch valves are installed at the bottom of both the alkaline scrubber (1) and the separator (4).

7. The novel reversible hydrogen purification device as described in claim 1, characterized in that: In the hydrogen power generation device, the gas storage device is connected to the online analyzer (6); the online analyzer (6) is connected to the drying tower (5), which is equipped with a heating device; the drying tower (5) is connected to the separator (4); the separator (4) is connected to the heat exchanger (3); a deoxygenation reactor bypass is set next to the deoxygenation reactor (2), and the heat exchanger (3) is connected to the hydrogen power generation device through the deoxygenation reactor bypass.

8. The novel reversible hydrogen purification device as described in claim 1 or 7, characterized in that: The online analyzer (6) includes a water dew point analyzer and a micro-oxygen analyzer; both the water dew point analyzer and the micro-oxygen analyzer are connected to the pipeline.

9. The novel reversible hydrogen purification device as described in claim 1 or 7, characterized in that: Temperature detection devices are installed at both ends of the heat exchanger (3).

10. The novel reversible hydrogen purification device as described in claim 1 or 7, characterized in that: The deoxygenation reactor (2) is filled with palladium-platinum catalyst; the drying tower (5) is filled with calcium 5A aluminosilicate molecular sieve.

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