Energy consumption optimization system and method based on hydrogen purification process

Abstract

The invention provides an energy consumption optimization system and method based on a hydrogen purification process, and relates to the technical field of water electrolysis hydrogen production. The energy consumption optimization system based on the hydrogen purification process comprises a crude hydrogen input pipeline, a first waste heat recovery pipeline, a second waste heat recovery pipeline, a deoxidizing and cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a hydrogen conveying pipeline before cooling and a pure hydrogen output pipeline. The crude hydrogen input pipeline is communicated with the deoxidizing and cooling unit; the first waste heat recovery pipeline and the second waste heat recovery pipeline are communicated among the deoxidizing and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit and the third hydrogen cooling and drying unit. The hydrogen purification device has the beneficial effects that the energy loss in the hydrogen purification process can be reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by water electrolysis, and more specifically, to an energy consumption optimization system and method based on the hydrogen purification process. Background Art

[0002] With the increasing consumption of traditional fossil energy, the environmental pollution and carbon emission pressure are also continuously increasing. Exploring the path of green transformation has become a global consensus. As a new energy with great potential, hydrogen energy is gradually becoming the focus of the energy field. Compared with traditional energy, hydrogen energy has significant advantages such as clean and low-carbon, high calorific value, diverse sources, flexible storage and transportation, and less loss, providing an effective way to solve environmental pollution and climate change problems.

[0003] With the wide application of hydrogen energy in the energy field, exploring efficient hydrogen production methods has become the core issue in the development of hydrogen energy. Among many hydrogen production technologies, the raw materials for hydrogen production by water electrolysis are widely available, the reaction conditions are relatively mild, easy to control and operate, which is conducive to industrial production. In addition, with the increase in the installed capacity of renewable energy, renewable energy power generation is gradually combined with hydrogen production by water electrolysis, becoming one of the power sources for hydrogen production by water electrolysis. The technology of hydrogen production by water electrolysis is of key significance for realizing the low-carbon development of the hydrogen production link, providing strong support for building a green and low-carbon energy system, effectively solving the problem of renewable energy consumption, and improving the stability and reliability of the energy system.

[0004] Since the gas-liquid coexists in the electrolytic cell of the hydrogen production reaction, the generated hydrogen will entrain oxygen and droplets, which need to be removed in the subsequent purification process to improve the purity of the hydrogen product. The common hydrogen purification process includes three processes: deoxidation, cooling and drying. The main impurities in the crude hydrogen are oxygen and water vapor. In the deoxidation tower, the hydrogen is heated by an electric heater and flows through the catalyst. When the hydrogen reacts with oxygen, water vapor is generated and condensed in the subsequent cooler. The generated water vapor is removed by separation through a gas-liquid separator, thereby removing the oxygen impurity in the hydrogen. The deoxygenated gas is cooled by a cooler and then enters the drying tower to remove the water vapor impurity. After the desiccant in the drying tower is saturated with water, it needs to be heated by an electric heater to evaporate the water to realize the regeneration of the desiccant, and finally cooled by the natural cooling process to lower the temperature and restore the adsorption temperature, and enter the adsorption state again; however, both deoxidation and heating regeneration consume a large amount of electric energy for heating, and a large amount of waste heat is dissipated during the natural cooling process, resulting in a large amount of energy loss.

[0005] Therefore, the present invention provides an energy consumption optimization system and method based on the hydrogen purification process, which can reduce the energy loss in the hydrogen purification process and improve the energy utilization efficiency. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides an energy consumption optimization system and method based on the hydrogen purification process, which can reduce the energy loss during the hydrogen purification process and improve the energy utilization efficiency.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an energy consumption optimization system based on the hydrogen purification process, which is improved in that the energy consumption optimization system based on the hydrogen purification process includes a crude hydrogen input pipeline, a first waste heat recovery pipeline, a second waste heat recovery pipeline, a deoxidation and cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a hydrogen pipeline before cooling, and a pure hydrogen output pipeline; the crude hydrogen input pipeline is communicated with the deoxidation and cooling unit; both the first waste heat recovery pipeline and the second waste heat recovery pipeline are communicated between the deoxidation and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; the hydrogen pipeline before cooling is communicated between the deoxidation and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; the pure hydrogen output pipeline is connected to the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit.

[0008] In the above structure, the deoxidation and cooling unit includes a crude hydrogen water separator, a deoxidation tower, a deoxidation cooler, a deoxidized process gas water separator, a compressor, and a throttle valve; the crude hydrogen water separator is communicated between the crude hydrogen input pipeline and the deoxidation tower; the deoxidation tower is communicated with the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the deoxidation cooler; the deoxidized process gas water separator is communicated between the deoxidation cooler and the hydrogen pipeline before cooling; the compressor is fixedly installed on the first waste heat recovery pipeline; the throttle valve is fixedly installed on the second waste heat recovery pipeline.

[0009] In the above structure, the first hydrogen cooling and drying unit includes a first pneumatic three-way ball valve, a first hydrogen gas-water separator before cooling, a first cooler, a first hydrogen gas conveying pipeline after cooling, a first drying tower, a first hydrogen gas conveying pipeline after drying, a first hydrogen pipeline switching valve, a second hydrogen pipeline switching valve, a first waste heat recovery pipeline switching valve, and a second waste heat recovery pipeline switching valve; the first pneumatic three-way ball valve is connected between the first hydrogen gas-water separator before cooling, the hydrogen gas conveying pipeline before cooling, the second hydrogen cooling and drying unit, and the second hydrogen cooling and drying unit; the first hydrogen gas-water separator before cooling is connected to the first cooler; the first hydrogen gas conveying pipeline after cooling is connected between the first cooler and the first drying tower; the first drying tower is connected to the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the first hydrogen gas conveying pipeline after drying; the first hydrogen gas conveying pipeline after drying is connected to the pure hydrogen output pipeline; the first hydrogen pipeline switching valve is fixedly installed on the first hydrogen gas conveying pipeline after drying, the second hydrogen pipeline switching valve is fixedly installed on the first hydrogen gas conveying pipeline after cooling, and both the first hydrogen pipeline switching valve and the second hydrogen pipeline switching valve are close to the first drying tower; the first waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, the second waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and both the first waste heat recovery pipeline switching valve and the second waste heat recovery pipeline switching valve are close to the first drying tower.

[0010] In the above structure, the second hydrogen cooling and drying unit includes a second pneumatic three-way ball valve, a second pre-cooling hydrogen gas-water separator, a second cooler, a second post-cooling hydrogen delivery pipeline, a second drying tower, a second post-drying hydrogen delivery pipeline, a third hydrogen pipeline switching valve, a fourth hydrogen pipeline switching valve, a third waste heat recovery pipeline switching valve, and a fourth waste heat recovery pipeline switching valve; the second pneumatic three-way ball valve is connected between the second pre-cooling hydrogen gas-water separator, the pre-cooling hydrogen delivery pipeline, the third hydrogen cooling and drying unit, and the first pneumatic three-way ball valve; the second pre-cooling hydrogen gas-water separator is connected to the second cooler; the second post-cooling hydrogen delivery pipeline is connected between the second cooler and the second drying tower; the second drying tower is connected to the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the second post-drying hydrogen delivery pipeline; the second post-drying hydrogen delivery pipeline is connected to the pure hydrogen output pipeline; the third hydrogen pipeline switching valve is fixedly installed on the second post-drying hydrogen delivery pipeline, the fourth hydrogen pipeline switching valve is fixedly installed on the second post-cooling hydrogen delivery pipeline, and both the third hydrogen pipeline switching valve and the fourth hydrogen pipeline switching valve are close to the second drying tower; the third waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, the fourth waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and both the third waste heat recovery pipeline switching valve and the fourth waste heat recovery pipeline switching valve are close to the second drying tower.

[0011] In the above structure, the third hydrogen cooling and drying unit includes a third pneumatic three-way ball valve, a third pre-cooling hydrogen gas-water separator, a third cooler, a third post-cooling hydrogen transmission pipeline, a third drying tower, a third post-drying hydrogen transmission pipeline, a fifth hydrogen pipeline switching valve, a sixth hydrogen pipeline switching valve, a fifth waste heat recovery pipeline switching valve, and a sixth waste heat recovery pipeline switching valve; the third pneumatic three-way ball valve is connected between the third pre-cooling hydrogen gas-water separator, the pre-cooling hydrogen transmission pipeline, the first pneumatic three-way ball valve, and the second pneumatic three-way ball valve; the third pre-cooling hydrogen gas-water separator is connected to the third cooler; the third post-cooling hydrogen transmission pipeline is connected between the third cooler and the third drying tower; the third drying tower is connected to the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the third post-drying hydrogen transmission pipeline; the third post-drying hydrogen transmission pipeline is connected to the pure hydrogen output pipeline; the fifth hydrogen pipeline switching valve is fixedly installed on the third post-drying hydrogen transmission pipeline, the sixth hydrogen pipeline switching valve is fixedly installed on the third post-cooling hydrogen transmission pipeline, and both the fifth hydrogen pipeline switching valve and the sixth hydrogen pipeline switching valve are close to the third drying tower; the fifth waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, the sixth waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and both the fifth waste heat recovery pipeline switching valve and the sixth waste heat recovery pipeline switching valve are close to the third drying tower.

[0012] An energy consumption optimization method based on the hydrogen purification process is applied to an energy consumption optimization system based on the hydrogen purification process as described above. The improvement lies in that the energy consumption optimization method based on the hydrogen purification process specifically includes the following steps: The crude hydrogen enters the deoxygenation and cooling unit through the crude hydrogen input pipeline and undergoes deoxygenation, preliminary cooling, and preliminary dehydration in sequence to obtain primary treated hydrogen. The primary treated hydrogen enters the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit through the pre-cooling hydrogen transmission pipeline for secondary dehydration, secondary cooling, and drying to obtain pure hydrogen, and the pure hydrogen is output through the pure hydrogen output pipeline. During the process of drying the primary treated hydrogen by the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit, waste heat is generated, and the waste heat is recovered to the deoxygenation and cooling unit through the first waste heat recovery pipeline and the second waste heat recovery pipeline for the deoxygenation reaction of the deoxygenation and cooling unit.

[0013] Furthermore, the specific methods for deoxygenation, preliminary cooling, and preliminary dehydration of the crude hydrogen are as follows: the crude hydrogen undergoes preliminary dehydration through the crude hydrogen gas-water separator, deoxygenation through the deoxygenation tower, preliminary cooling through the deoxygenation cooler, and optimization of the deoxygenation and preliminary dehydration effects through the deoxygenation process gas-water separator.

[0014] Furthermore, the specific methods for the secondary dehydration, secondary cooling, and drying of the primary treated hydrogen are as follows: The primary treated hydrogen successively enters the first pre-cooling hydrogen gas-water separator / the second pre-cooling hydrogen gas-water separator / the third pre-cooling hydrogen gas-water separator through the pre-cooling hydrogen transmission pipeline via the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve for secondary dehydration, passes through the first cooler / the second cooler / the third cooler for secondary cooling, and passes through the first drying tower / the second drying tower / the third drying tower for drying.

[0015] Furthermore, during the processes of secondary cooling and dehydration, secondary cooling, and drying of the primary treated hydrogen, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling unit continuously alternate through the adsorption drying stage, the heating regeneration stage, and the cooling stage; among which: Adsorption drying stage: After the primary treated hydrogen is secondarily cooled by the first cooler / the second cooler / the third cooler, it enters the first drying tower / the second drying tower / the third drying tower through the first post-cooling hydrogen transmission pipeline / the second post-cooling hydrogen transmission pipeline / the third post-cooling hydrogen transmission pipeline and is adsorbed and dried by the desiccant attached to the outer side of the internal coil to obtain pure hydrogen, which is then output through the pure hydrogen output pipeline. Heating regeneration stage: By heating the desiccant inside the first drying tower / the second drying tower / the third drying tower, the moisture absorbed by the desiccant is evaporated to ensure the activity of the desiccant. Cooling stage: The heat released during the adsorption drying stage and the heating regeneration stage is absorbed by the refrigerant inside the first drying tower / the second drying tower / the third drying tower. The refrigerant is evaporated into gaseous refrigerant, and the gaseous refrigerant enters the deoxidation tower through the first waste heat recovery pipeline after being increased in temperature and pressure by the compressor to provide heat for the deoxidation of the deoxidation tower. The gaseous refrigerant becomes liquid refrigerant after heat exchange in the deoxidation process, and the liquid refrigerant enters the first drying tower / the second drying tower / the third drying tower through the second waste heat recovery pipeline via the throttle valve.

[0016] Further, in the adsorption drying stage, the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve open the channel between the hydrogen delivery pipeline before cooling and the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve; the first hydrogen pipeline switching valve, the second hydrogen pipeline switching valve / the third hydrogen pipeline switching valve, the fourth hydrogen pipeline switching valve / the fifth hydrogen pipeline switching valve, the sixth hydrogen pipeline switching valve are opened; the first waste heat recovery pipeline switching valve, the second waste heat recovery pipeline switching valve / the third waste heat recovery pipeline switching valve, the fourth waste heat recovery pipeline switching valve / the fifth waste heat recovery pipeline switching valve, the sixth waste heat recovery pipeline switching valve are closed; in the cooling stage and the heating regeneration stage, the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve close the channel between the hydrogen delivery pipeline before cooling and the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve; the first hydrogen pipeline switching valve, the second hydrogen pipeline switching valve / the third hydrogen pipeline switching valve, the fourth hydrogen pipeline switching valve / the fifth hydrogen pipeline switching valve, the sixth hydrogen pipeline switching valve are closed; the first waste heat recovery pipeline switching valve, the second waste heat recovery pipeline switching valve / the third waste heat recovery pipeline switching valve, the fourth waste heat recovery pipeline switching valve / the fifth waste heat recovery pipeline switching valve, the sixth waste heat recovery pipeline switching valve are opened.

[0017] The beneficial effects of the present invention are as follows: By designing the first waste heat recovery pipeline and the second waste heat recovery pipeline between the deoxidation cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit in this solution, it is used to recover the waste heat generated during the drying process of hydrogen by the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit, and transport it to the deoxidation cooling unit to maintain the reaction temperature for its deoxidation reaction. Therefore, the present invention can reduce the energy loss in the hydrogen purification process and improve the energy utilization efficiency. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of an energy consumption optimization system based on the hydrogen purification process of the present invention; Figure 2 It is an overall flowchart of an energy consumption optimization system based on the hydrogen purification process of the present invention. Detailed Embodiments

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention. In addition, all the connection / linkage relationships involved in the patent do not simply refer to the direct connection of components, but refer to the formation of a more optimal connection structure by adding or reducing connection accessories according to the specific implementation situation. Each technical feature in the present invention can be interactively combined on the premise of not conflicting with each other.

[0021] Referring to Figure 1 As shown, the present invention discloses an energy consumption optimization system based on the hydrogen purification process. The energy consumption optimization system based on the hydrogen purification process includes a crude hydrogen input pipeline 1, a first waste heat recovery pipeline 8, a second waste heat recovery pipeline 9, a deoxidation and cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a hydrogen pipeline 10 before cooling, and a pure hydrogen output pipeline 41; the crude hydrogen input pipeline 1 is communicated with the deoxidation and cooling unit; both the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 are connected between the deoxidation and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; the hydrogen pipeline 10 before cooling is connected between the deoxidation and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; the pure hydrogen output pipeline 41 is connected to the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit.

[0022] It should be noted that in this embodiment, the crude hydrogen input pipeline 1 is used to input crude hydrogen into the deoxidation and cooling unit; the deoxidation and cooling unit is used to deoxidize, preliminarily cool, and preliminarily dehydrate the crude hydrogen to obtain primary treated hydrogen; the pre-cooling hydrogen transmission pipeline 10 is used to input the primary treated hydrogen into the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit; the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit are all used to perform secondary dehydration, secondary cooling, and drying on the primary treated hydrogen to obtain pure hydrogen, and the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit will generate waste heat during the drying process of the primary treated hydrogen; the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 are used to transport the waste heat to the deoxidation and cooling unit to maintain the reaction temperature for the deoxidation reaction; the pure hydrogen output pipeline 41 is used to output pure hydrogen to enter the next process; when specifically implementing the present invention, first, the crude hydrogen enters the deoxidation and cooling unit through the crude hydrogen input pipeline 1 to be deoxidized, preliminarily cooled, and preliminarily dehydrated to obtain primary treated hydrogen; then, the primary treated hydrogen enters the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit through the pre-cooling hydrogen transmission pipeline 10 for secondary dehydration, secondary cooling, and drying to obtain pure hydrogen, and the pure hydrogen is output through the pure hydrogen output pipeline 41; in addition, the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit will generate waste heat during the drying process of the primary treated hydrogen, and the waste heat is recovered through the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 to the deoxidation and cooling unit for the deoxidation reaction of the deoxidation and cooling unit; during this process, the energy consumption optimization system based on the hydrogen purification process can recover the waste heat generated during the drying process of the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit on hydrogen and transport it to the deoxidation and cooling unit to maintain the reaction temperature for the deoxidation reaction. Therefore, this embodiment can reduce the energy loss during the hydrogen purification process and improve the energy utilization efficiency.

[0023] Continue to refer to Figure 1 As shown, the deoxidation and cooling unit includes a crude hydrogen water separator 2, a deoxidation tower 3, a deoxidation cooler 4, a deoxidation process gas water separator 5, a compressor 6, and a throttle valve 7; the crude hydrogen water separator 2 is connected between the crude hydrogen input pipeline 1 and the deoxidation tower 3; the deoxidation tower 3 is connected to the first waste heat recovery pipeline 8, the second waste heat recovery pipeline 9, and the deoxidation cooler 4; the deoxidation process gas water separator 5 is connected between the deoxidation cooler 4 and the pre-cooling hydrogen transmission pipeline 10; the compressor 6 is fixedly installed on the first waste heat recovery pipeline 8; the throttle valve 7 is fixedly installed on the second waste heat recovery pipeline 9.

[0024] It should be noted that in this embodiment, in the hydrogen production reaction electrolytic cell, gas and liquid coexist, and the generated hydrogen gas will entrain oxygen and droplets. This gas is the raw material gas in this embodiment, that is, crude hydrogen; the crude hydrogen gas-water separator 2 is used to remove water vapor or liquid water in the raw material gas by means of condensation or filtration, etc., to ensure that the gas sent to the deoxidation tower 3 is relatively dry and reduce the burden of subsequent treatment; the function of the deoxidation tower 3 is to remove oxygen in the raw material gas. Specifically, the deoxidation tower 3 can remove oxygen molecules in the gas by adsorption or catalysis to remove oxygen from the raw material gas to meet the requirements of downstream treatment or use; the deoxidation cooler 4 is used to lower the temperature of the gas after deoxidation; the deoxidized process gas-water separator 5 is used to further remove moisture in the cooled gas. Even during the deoxidation and cooling processes, the gas may still contain water vapor or trace amounts of liquid water. The deoxidized process gas-water separator 5 can optimize the dehydration and deoxidation effects of the deoxidation cooling unit by further removing moisture in the cooled gas to obtain primary treated hydrogen; the compressor 6 is used to pressurize and heat the gaseous refrigerant generated by the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit and transported through the first waste heat recovery pipeline 8 to ensure that the temperature of the gaseous refrigerant transported to the deoxidation tower 3 can meet the requirements of the deoxidation reaction; the throttle valve 7 is used to prevent heat loss in the deoxidation tower 3, that is, when the deoxidation tower 3 is undergoing a deoxidation reaction, the throttle valve 7 is closed; when the deoxidation reaction in the deoxidation tower 3 is completed and the gaseous refrigerant becomes a liquid refrigerant, at this time, the throttle valve 7 is opened, and the liquid refrigerant flows back to the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit through the second waste heat recovery pipeline 9.

[0025] It should also be noted that in this embodiment, a liquid refrigerant is provided in each of the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit. The liquid refrigerant is used to absorb the heat dissipated during the natural cooling of the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit. After absorption, the liquid refrigerant becomes a gaseous refrigerant and is input into the deoxidation tower 3 through the first waste heat transmission pipeline.

[0026] Continue to refer to Figure 1As shown in the figure, the first hydrogen cooling and drying unit includes a first pneumatic three-way ball valve 11, a first pre-cooling hydrogen gas-water separator 12, a first cooler 13, a first post-cooling hydrogen transmission pipeline 14, a first drying tower 15, a first post-drying hydrogen transmission pipeline 16, a first hydrogen pipeline switching valve 19, a second hydrogen pipeline switching valve 20, a first waste heat recovery pipeline switching valve 17, and a second waste heat recovery pipeline switching valve 18; the first pneumatic three-way ball valve 11 is connected between the first pre-cooling hydrogen gas-water separator 12, the pre-cooling hydrogen transmission pipeline 10, the second hydrogen cooling and drying unit, and the second hydrogen cooling and drying unit; the first pre-cooling hydrogen gas-water separator 12 is connected to the first cooler 13; the first post-cooling hydrogen transmission pipeline 14 is connected between the first cooler 13 and the first drying tower 15; the first drying tower 15 is connected to the first waste heat recovery pipeline 8, the second waste heat recovery pipeline 9, and the first post-drying hydrogen transmission pipeline 16; the first post-drying hydrogen transmission pipeline 16 is connected to the pure hydrogen output pipeline 41; the first hydrogen pipeline switching valve 19 is fixedly installed on the first post-drying hydrogen transmission pipeline 16, the second hydrogen pipeline switching valve 20 is fixedly installed on the first post-cooling hydrogen transmission pipeline 14, and both the first hydrogen pipeline switching valve 19 and the second hydrogen pipeline switching valve 20 are close to the first drying tower 15; the first waste heat recovery pipeline switching valve 17 is fixedly installed on the first waste heat recovery pipeline 8, the second waste heat recovery pipeline switching valve 18 is fixedly installed on the second waste heat recovery pipeline 9, and both the first waste heat recovery pipeline switching valve 17 and the second waste heat recovery pipeline switching valve 18 are close to the first drying tower 15; the second hydrogen cooling and drying unit includes a second pneumatic three-way ball valve 21, a second pre-cooling hydrogen gas-water separator 22, a second cooler 23, a second post-cooling hydrogen transmission pipeline 24, a second drying tower 25, a second post-drying hydrogen transmission pipeline 26, a third hydrogen pipeline switching valve 29, a fourth hydrogen pipeline switching valve 30, a third waste heat recovery pipeline switching valve 27, and a fourth waste heat recovery pipeline switching valve 28; the second pneumatic three-way ball valve 21 is connected between the second pre-cooling hydrogen gas-water separator 22, the pre-cooling hydrogen transmission pipeline 10, the third hydrogen cooling and drying unit, and the first pneumatic three-way ball valve 11; the second pre-cooling hydrogen gas-water separator 22 is connected to the second cooler 23; the second post-cooling hydrogen transmission pipeline 24 is connected between the second cooler 23 and the second drying tower 25; the second drying tower 25 is connected to the first waste heat recovery pipeline 8, the second waste heat recovery pipeline 9, and the second post-drying hydrogen transmission pipeline 26; the second post-drying hydrogen transmission pipeline 26 is connected to the pure hydrogen output pipeline 41;The third hydrogen pipeline switching valve 29 is fixedly installed on the second hydrogen pipeline for conveying dried hydrogen 26, and the fourth hydrogen pipeline switching valve 30 is fixedly installed on the second hydrogen pipeline for conveying cooled hydrogen 24. Both the third hydrogen pipeline switching valve 29 and the fourth hydrogen pipeline switching valve 30 are close to the second drying tower 25. The third waste heat recovery pipeline switching valve 27 is fixedly installed on the first waste heat recovery pipeline 8, and the fourth waste heat recovery pipeline switching valve 28 is fixedly installed on the second waste heat recovery pipeline 9. Both the third waste heat recovery pipeline switching valve 27 and the fourth waste heat recovery pipeline switching valve 28 are close to the second drying tower 25. The third hydrogen cooling and drying unit includes a third pneumatic three-way ball valve 31, a third hydrogen gas-water separator before cooling 32, a third cooler 33, a third hydrogen pipeline for conveying cooled hydrogen 34, a third drying tower 35, a third hydrogen pipeline for conveying dried hydrogen 36, a fifth hydrogen pipeline switching valve 39, a sixth hydrogen pipeline switching valve 40, a fifth waste heat recovery pipeline switching valve 37, and a sixth waste heat recovery pipeline switching valve 38. The third pneumatic three-way ball valve 31 is connected between the third hydrogen gas-water separator before cooling 32, the hydrogen pipeline for conveying cooled hydrogen before cooling 10, the first pneumatic three-way ball valve 11, and the second pneumatic three-way ball valve 21. The third hydrogen gas-water separator before cooling 32 is connected to the third cooler 33. The third hydrogen pipeline for conveying cooled hydrogen 34 is connected between the third cooler 33 and the third drying tower 35. The third drying tower 35 is connected to the first waste heat recovery pipeline 8, the second waste heat recovery pipeline 9, and the third hydrogen pipeline for conveying dried hydrogen 36. The third hydrogen pipeline for conveying dried hydrogen 36 is connected to the pure hydrogen output pipeline 41. The fifth hydrogen pipeline switching valve 39 is fixedly installed on the third hydrogen pipeline for conveying dried hydrogen 36, and the sixth hydrogen pipeline switching valve 40 is fixedly installed on the third hydrogen pipeline for conveying cooled hydrogen 34. Both the fifth hydrogen pipeline switching valve 39 and the sixth hydrogen pipeline switching valve 40 are close to the third drying tower 35. The fifth waste heat recovery pipeline switching valve 37 is fixedly installed on the first waste heat recovery pipeline 8, and the sixth waste heat recovery pipeline switching valve 38 is fixedly installed on the second waste heat recovery pipeline 9. Both the fifth waste heat recovery pipeline switching valve 37 and the sixth waste heat recovery pipeline switching valve 38 are close to the third drying tower 35.;

[0027] It should be noted that in this embodiment, the first pneumatic three-way ball valve 11, the second pneumatic three-way ball valve 21, and the third pneumatic three-way ball valve 31 are respectively used to control the on-off of the channels between the hydrogen transportation pipeline 10 before cooling and the first hydrogen-gas-water separator 12 before cooling, the second hydrogen-gas-water separator 22 before cooling, and the third hydrogen-gas-water separator 32 before cooling. And in the specific implementation process, only one of the three channels between the hydrogen transportation pipeline 10 before cooling and the first hydrogen-gas-water separator 12 before cooling and the second hydrogen-gas-water separator 22 before cooling is open; the first hydrogen-gas-water separator 12 before cooling, the second hydrogen-gas-water separator 22 before cooling, and the third hydrogen-gas-water separator 32 before cooling are all used for secondary dehydration treatment of the primary treated hydrogen; the first cooler 13, the second cooler 23, and the third cooler 33 are all used for secondary cooling treatment of the dehydrated primary treated hydrogen; the first hydrogen transportation pipeline 14 after cooling, the second hydrogen transportation pipeline 24 after cooling, and the third hydrogen transportation pipeline 34 after cooling are respectively used to transport the primary treated hydrogen after secondary dehydration treatment and secondary cooling treatment to the first drying tower 15, the second drying tower 25, and the third drying tower 35; the first drying tower 15, the second drying tower 25, and the third drying tower 35 are all used for drying treatment of the primary treated hydrogen after secondary dehydration treatment and secondary cooling treatment; the first hydrogen transportation pipeline 16 after drying, the second hydrogen transportation pipeline 26 after drying, and the third hydrogen transportation pipeline 36 after drying are respectively used to transport the pure hydrogen obtained after the drying treatment of the first drying tower 15, the second drying tower 25, and the third drying tower 35 to the pure hydrogen output pipeline 41; the opening and closing of the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18, the first hydrogen pipeline switching valve 19, and the second hydrogen pipeline switching valve 20 are used to adapt to the process stages of the first drying tower 15. When the first drying tower 15 adsorbs and dries the primary treated hydrogen with the desiccant, the first hydrogen pipeline switching valve 19, the second hydrogen pipeline switching valve 20, the first waste heat recovery pipeline switching valve 17, and the second waste heat recovery pipeline switching valve 18 are all open; when the desiccant in the first drying tower 15 is heated and regenerated, the first hydrogen pipeline switching valve 19, the second hydrogen pipeline switching valve 20, the first waste heat recovery pipeline switching valve 17, and the second waste heat recovery pipeline switching valve 18 are all closed; when the desiccant in the first drying tower 15 is cooled, the first hydrogen pipeline switching valve 19 and the second hydrogen pipeline switching valve 20 are closed, and the first waste heat recovery pipeline switching valve 17 and the second waste heat recovery pipeline switching valve 18 are open;The opening and closing of the third waste heat recovery pipeline switching valve 27, the fourth waste heat recovery pipeline switching valve 28, the third hydrogen pipeline switching valve 29, and the fourth hydrogen pipeline switching valve 30 are used to adapt to the process stages of the second drying tower 25. When the second drying tower 25 adsorbs and dries the primary treated hydrogen with desiccant, the third hydrogen pipeline switching valve 29, the fourth hydrogen pipeline switching valve 30, the third waste heat recovery pipeline switching valve 27, and the fourth waste heat recovery pipeline switching valve 28 are all opened; when the desiccant in the second drying tower 25 is heated for regeneration, the third hydrogen pipeline switching valve 29, the fourth hydrogen pipeline switching valve 30, the third waste heat recovery pipeline switching valve 27, and the fourth waste heat recovery pipeline switching valve 28 are all closed; when the second drying tower 25 is cooled, the third hydrogen pipeline switching valve 29 and the fourth hydrogen pipeline switching valve 30 are closed, and the third waste heat recovery pipeline switching valve 27 and the fourth waste heat recovery pipeline switching valve 28 are opened; the opening and closing of the fifth waste heat recovery pipeline switching valve 37, the sixth waste heat recovery pipeline switching valve 38, the fifth hydrogen pipeline switching valve 39, and the sixth hydrogen pipeline switching valve 40 are used to adapt to the process stages of the third drying tower 35. When the third drying tower 35 dries the primary treated hydrogen with desiccant, the fifth hydrogen pipeline switching valve 39, the sixth hydrogen pipeline switching valve 40, the fifth waste heat recovery pipeline switching valve 37, and the sixth waste heat recovery pipeline switching valve 38 are all opened; when the desiccant in the third drying tower 35 is heated for regeneration, the fifth hydrogen pipeline switching valve 39, the sixth hydrogen pipeline switching valve 40, the fifth waste heat recovery pipeline switching valve 37, and the sixth waste heat recovery pipeline switching valve 38 are all closed; when the desiccant in the third drying tower 35 is cooled, the fifth hydrogen pipeline switching valve 39 and the sixth hydrogen pipeline switching valve 40 are closed, and the fifth waste heat recovery pipeline switching valve 37 and the sixth waste heat recovery pipeline switching valve 38 are opened.;

[0028] Referring to Figure 2 As shown, the present invention also discloses an energy consumption optimization method based on the hydrogen purification process, which is applied to an energy consumption optimization system based on the hydrogen purification process as described in the above embodiment. The energy consumption optimization method based on the hydrogen purification process specifically includes the following steps: S10, The crude hydrogen enters the deoxidation and cooling unit through the crude hydrogen input pipeline 1 and is successively deoxidized, preliminarily cooled, and preliminarily dehydrated to obtain the primary treated hydrogen; specifically, the specific methods for deoxidation, preliminary cooling, and preliminary dehydration of the crude hydrogen are: the crude hydrogen is successively preliminarily dehydrated through the crude hydrogen-water separator 2, deoxidized through the deoxidation tower 3, preliminarily cooled through the deoxidation cooler 4, and the deoxidation and preliminary dehydration effects are optimized through the deoxidation process gas-water separator 5; S20. The primary treated hydrogen enters the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit through the pre-cooling hydrogen transmission pipeline 10 for secondary dehydration, secondary cooling and drying to obtain pure hydrogen, and the pure hydrogen is output through the pure hydrogen output pipeline 41. Specifically, the specific methods for the primary treated hydrogen to undergo secondary dehydration, secondary cooling and drying are as follows: The primary treated hydrogen successively enters the first pre-cooling hydrogen gas-water separator 12 / the second pre-cooling hydrogen gas-water separator 22 / the third pre-cooling hydrogen gas-water separator 32 through the pre-cooling hydrogen transmission pipeline 10 via the first pneumatic three-way ball valve 11 / the second pneumatic three-way ball valve 21 / the third pneumatic three-way ball valve 31 for secondary dehydration, enters the first cooler 13 / the second cooler 23 / the third cooler 33 for secondary cooling, and enters the first drying tower 15 / the second drying tower 25 / the third drying tower 35 for drying. S30. During the process of the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit drying the primary treated hydrogen, waste heat is generated, and the waste heat is recovered to the deoxidation cooling unit through the first waste heat recovery pipeline and the second waste heat recovery pipeline 9 for the deoxidation cooling unit to carry out the deoxidation reaction.

[0029] It should be noted that in this embodiment, the energy consumption optimization system based on the hydrogen purification process can, through the above steps S10 - S30, during the process of purifying the crude hydrogen, recover the heat dissipated during the natural cooling process of the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit through the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9, and transport it to the deoxidation cooling unit to maintain the reaction temperature for its deoxidation reaction, so as to achieve the effect of reducing the energy loss during the hydrogen purification process and improving the energy utilization efficiency.

[0030] Furthermore, during the process of the primary treated hydrogen undergoing secondary cooling dehydration, secondary cooling and drying, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling unit continuously alternate between the adsorption drying stage, the heating regeneration stage, and the cooling stage; among them: Adsorption drying stage: After the primary treated hydrogen is secondarily cooled by the first cooler 13 / the second cooler 23 / the third cooler 33, it enters the first drying tower 15 / the second drying tower 25 / the third drying tower 35 through the first post-cooling hydrogen transmission pipeline 14 / the second post-cooling hydrogen transmission pipeline 24 / the third post-cooling hydrogen transmission pipeline 34 and is adsorbed and dried by the desiccant attached to the outer side of the internal coil to obtain pure hydrogen and output it through the pure hydrogen output pipeline 41. Heating regeneration stage: By heating the desiccant inside the first drying tower 15 / the second drying tower 25 / the third drying tower 35, the moisture absorbed by the desiccant is evaporated to ensure the activity of the desiccant. Cooling stage: The heat released during the adsorption drying stage and the heating regeneration stage is absorbed by the refrigerant inside the first drying tower 15 / second drying tower 25 / third drying tower 35. The refrigerant is evaporated into gaseous refrigerant, and the gaseous refrigerant enters the deoxidation tower 3 after the temperature and pressure are increased by the compressor 6 through the first waste heat recovery pipeline 8 to provide heat for the deoxidation of the deoxidation tower 3. The gaseous refrigerant becomes liquid refrigerant after heat exchange in the deoxidation process, and the liquid refrigerant enters the first drying tower 15 / second drying tower 25 / third drying tower 35 through the throttle valve 7 via the second waste heat recovery pipeline 9.

[0031] It should be noted that in this embodiment, an example is given where the first drying tower 15 is in the cooling stage, the second drying tower 25 is in the adsorption drying stage, and the third drying tower 35 is in the heating regeneration stage; the primary treated hydrogen gas flows through the pre-cooling hydrogen gas transmission pipeline 10, and the first pneumatic three-way ball valve 11 and the third pneumatic three-way ball valve 31 respectively close the channels between the pre-cooling hydrogen gas transmission pipeline 10 and the first pre-cooling hydrogen gas-water separator 12 and the third pre-cooling hydrogen gas-water separator 32; the second pneumatic three-way ball valve 21 opens the channel between the pre-cooling hydrogen gas transmission pipeline 10 and the second pre-cooling hydrogen gas-water separator 22; the primary treated hydrogen gas successively passes through the second pre-cooling hydrogen gas-water separator 22, the second cooler 23, and the second post-cooling hydrogen gas transmission pipeline 24 and enters the second drying tower 25. The moisture in the primary treated hydrogen gas is absorbed by the desiccant in the drying tower. At this time, after the primary treated hydrogen gas is completely absorbed by the desiccant, it becomes pure hydrogen. The pure hydrogen is transported to the hydrogen output pipeline through the second post-drying hydrogen gas transmission pipeline 26 and the pure hydrogen is output to enter the next process. Moreover, the desiccant will release heat during the adsorption drying process. The liquid refrigerant in the internal coil of the second drying tower 25 will absorb the heat generated during the adsorption drying process of the desiccant attached to the outer side of the internal coil of the second drying tower 25. At this time, the liquid refrigerant becomes a gaseous refrigerant and enters the deoxidation tower 3 through the first waste heat recovery pipeline 8, and is pressurized and heated by the compressor 6 on the way to reach the temperature required for the deoxidation reaction; on the other hand, the first waste heat recovery pipeline switching valve 17 and the second waste heat recovery pipeline switching valve 18 are opened, the third waste heat recovery pipeline switching valve 27 and the fourth waste heat recovery pipeline switching valve 28 are opened, and the fifth waste heat recovery pipeline switching valve 37 and the sixth waste heat recovery pipeline switching valve 38 are closed; since the first drying tower 15 is in the cooling stage at this time, the liquid refrigerant inside the first drying tower 15 will absorb the waste heat after the desiccant attached to the outer side of the internal coil of the first drying tower 15 is heated. At this time, the liquid refrigerant becomes a gaseous refrigerant and enters the deoxidation tower 3 through the first waste heat recovery pipeline 8, and is pressurized and heated by the compressor 6 on the way to reach the temperature required for the deoxidation reaction; in addition, the third drying tower 35 is in the heating regeneration stage. Since the process stages among the first drying tower 15, the second drying tower 25, and the third drying tower 35 are constantly alternating, at this time, the desiccant in the third drying tower 35 has adsorbed too much moisture during the previous switching to the adsorption drying process, and it is necessary to evaporate the absorbed moisture by heating the desiccant to ensure the activity of the desiccant and prepare for the subsequent alternation; during the heating process, the moisture in the desiccant is evaporated to ensure the drying effect of the desiccant.During this process, the energy consumption optimization system based on the hydrogen purification process can fully recover the waste heat of the first drying tower 15, the second drying tower 25, and the third drying tower 35 during the heating regeneration stage and the cooling stage to the deoxidation reaction in the deoxidation tower 3. Moreover, the compressor 6 only heats up and pressurizes the recovered heat, and does not directly convert electricity into heat. Therefore, this embodiment can reduce the energy loss during the hydrogen purification process and improve the energy utilization efficiency.

[0032] Further, in the adsorption drying stage, the first pneumatic three-way ball valve 11 / the second pneumatic three-way ball valve 21 / the third pneumatic three-way ball valve 31 opens the channel between the hydrogen gas transmission pipeline 10 before cooling and the first pneumatic three-way ball valve 11 / the second pneumatic three-way ball valve 21 / the third pneumatic three-way ball valve 31; the first hydrogen gas pipeline switching valve 19, the second hydrogen gas pipeline switching valve 20 / the third hydrogen gas pipeline switching valve 29, the fourth hydrogen gas pipeline switching valve 30 / the fifth hydrogen gas pipeline switching valve 39, the sixth hydrogen gas pipeline switching valve 40 are opened; the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18 / the third waste heat recovery pipeline switching valve 27, the fourth waste heat recovery pipeline switching valve 28 / the fifth waste heat recovery pipeline switching valve 37, the sixth waste heat recovery pipeline switching valve 38 are closed; in the cooling stage and the heating regeneration stage, the first pneumatic three-way ball valve 11 / the second pneumatic three-way ball valve 21 / the third pneumatic three-way ball valve 31 closes the channel between the hydrogen gas transmission pipeline 10 before cooling and the first pneumatic three-way ball valve 11 / the second pneumatic three-way ball valve 21 / the third pneumatic three-way ball valve 31; the first hydrogen gas pipeline switching valve 19, the second hydrogen gas pipeline switching valve 20 / the third hydrogen gas pipeline switching valve 29, the fourth hydrogen gas pipeline switching valve 30 / the fifth hydrogen gas pipeline switching valve 39, the sixth hydrogen gas pipeline switching valve 40 are closed; the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18 / the third waste heat recovery pipeline switching valve 27, the fourth waste heat recovery pipeline switching valve 28 / the fifth waste heat recovery pipeline switching valve 37, the sixth waste heat recovery pipeline switching valve 38 are opened.

[0033] It should be noted that in this embodiment, the first hydrogen gas pipeline switching valve 19, the second hydrogen gas pipeline switching valve 20, the third hydrogen gas pipeline switching valve 29, the fourth hydrogen gas pipeline switching valve 30, the fifth hydrogen gas pipeline switching valve 39, the sixth hydrogen gas pipeline switching valve 40, the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18, the third waste heat recovery pipeline switching valve 27, the fourth waste heat recovery pipeline switching valve 28, the fifth waste heat recovery pipeline switching valve 37, and the sixth waste heat recovery pipeline switching valve 38 are designed to open and close alternately to adapt to the alternation between the first hydrogen gas cooling and drying unit, the second hydrogen gas cooling and drying unit, and the third hydrogen gas cooling unit during the adsorption drying stage, the heating regeneration stage, and the cooling stage.

[0034] As a preferred embodiment, in combination with the above system and method, the following is a detailed description of the specific working process of the present invention for hydrogen purification: First, the crude hydrogen enters the deoxidation and cooling unit through the crude hydrogen input pipeline 1, and successively passes through the crude hydrogen water separator 2 of the deoxidation and cooling unit for preliminary dehydration, through the deoxidation tower 3 for deoxidation, through the deoxidation cooler 4 for preliminary cooling, and through the deoxidation process gas water separator 5 to optimize the deoxidation and preliminary dehydration effects, so as to obtain the primary treated hydrogen; Then, when the primary treated hydrogen enters the hydrogen pipeline 10 before cooling, it will pass through the first pneumatic three-way ball valve 11, the second pneumatic three-way ball valve 21, and the third pneumatic three-way ball valve 31. At this time, only one of the first pneumatic three-way ball valve 11, the second pneumatic three-way ball valve 21, and the third pneumatic three-way ball valve 31 will open the channel between the hydrogen pipeline 10 and the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit. Taking the first pneumatic three-way ball valve 11 being open, the second pneumatic three-way ball valve 21, and the third pneumatic three-way ball valve 31 as an example, the primary treated hydrogen successively passes through the first hydrogen gas-water separator 12 before cooling to perform secondary dehydration treatment on the primary treated hydrogen, passes through the first cooler 13 to perform secondary cooling on the primary treated hydrogen, and passes through the first drying tower 15 for adsorption drying to obtain pure hydrogen and output it through the pure hydrogen output pipeline 41; In addition, after the first drying tower 15 undergoes the adsorption drying stage, it will also experience the heating regeneration stage and the cooling stage, and the adsorption drying stage, the heating regeneration stage, and the cooling stage are continuously rotated among the first drying tower 15, the second drying tower 25, and the third drying tower 35. For example, when the first drying tower 15 is in the adsorption drying stage, the second drying tower 25 is in the heating regeneration stage, and the third drying tower 35 is in the cooling stage. At this time, the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18, the fifth waste heat recovery pipeline switching valve 37, and the sixth waste heat recovery pipeline switching valve 38 are all opened; The first hydrogen pipeline switching valve 19 and the second hydrogen pipeline switching valve 20 are opened, the third waste heat recovery pipeline switching valve 27 and the fourth waste heat recovery pipeline switching valve 28 are closed, and the third hydrogen pipeline switching valve 29, the fourth hydrogen pipeline switching valve 30, the fifth hydrogen pipeline switching valve 39, and the sixth hydrogen pipeline switching valve 40 are all closed, where During the adsorption drying stage, the first hydrogen pipeline switching valve 19 and the second hydrogen pipeline switching valve 20 are opened to transport the primary treated hydrogen, which has undergone secondary dehydration and secondary cooling, through the first post-cooling hydrogen transmission pipeline 14 to the first drying tower for adsorption drying treatment to obtain pure hydrogen, and the pure hydrogen is transported through the first post-drying hydrogen transmission pipeline 16 to the pure hydrogen output pipeline 41 and output; the first waste heat recovery pipeline switching valve 17 and the second waste heat recovery pipeline switching valve 18 are opened because during the cooling of the desiccant, part of the heat and the heat released during the adsorption drying process of the desiccant will be absorbed by the liquid refrigerant inside the coil in the first drying tower 15, and when the liquid refrigerant absorbs enough heat, it will change from liquid to gas. At this time, the gaseous refrigerant will pass through the first waste heat recovery pipeline 8, be pressurized and heated by the compressor 6, and then enter the deoxidation tower, and heat exchange will occur during the deoxidation reaction process in the deoxidation tower, and the gaseous refrigerant will become liquid. At this time, the throttle valve 7 is opened, and the liquid refrigerant returns to the inside coil of the first drying tower 15 through the second waste heat recovery pipeline 9; during the heating regeneration stage, when the desiccant adsorbs too much moisture, its adsorption effect will be reduced. In this embodiment, the desiccant is heated to evaporate the excessive moisture in the desiccant, thereby ensuring its drying effect; during the cooling stage, the fifth waste heat recovery pipeline switching valve 37 and the sixth waste heat recovery pipeline switching valve 38 are opened because the desiccant after the heating regeneration stage still has residual heat. At this time, the refrigerant will fully absorb the residual heat of the desiccant, and similarly, the liquid refrigerant will become gaseous refrigerant. At this time, the gaseous refrigerant will go through the same process as in the heating regeneration stage, which will not be elaborated here. Finally, the liquid refrigerant flows back to the coil inside the third drying tower 35; and when specifically implementing the above working process, the first drying tower 15, the second drying tower 25, and the third drying tower 35 will cycle and stagger in the adsorption drying stage, the heating regeneration stage, and the cooling stage to ensure that the hydrogen purification process can continue based on the present invention.

[0035] It should also be noted that the deoxidation reaction requires maintaining a high temperature above 75°C. The existing system relies on an electric heater to control the temperature, and the electrothermal conversion efficiency is often less than 90%, resulting in huge heating energy consumption for the deoxidation reaction (accounting for about 50% of the total energy consumption in the hydrogen purification process). On the other hand, in order to maintain the drying efficiency and rate of the drying tower, it is necessary to cool the desiccant during the drying process and discharge both the heat input during the heating regeneration stage and the heat released during the moisture drying. The grade of this part of the heat is relatively low (<45°C) and cannot be directly reused. By recovering the waste heat, the present invention can effectively absorb the low-grade waste heat during the drying and natural cooling processes of the first drying tower 15, the second drying tower 25, and the third drying tower 35, accelerate the cooling rate of the drying tower, ensure the drying effect, and at the same time, after upgrading the grade of the waste heat, it is used in the deoxidation reaction, thereby avoiding the need for additional electric heating. Since the compressor 6 is only used to upgrade the grade of the thermal energy and does not directly convert electricity into heat, its energy efficiency can reach 400 - 600%, which is 4 - 6 times higher than that of the electric heater, thus reducing the energy consumption in the hydrogen purification process by more than 40%.

[0036] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An energy consumption optimization system based on the hydrogen purification process, characterized in that, The energy consumption optimization system based on the hydrogen purification process includes a crude hydrogen input pipeline, a first waste heat recovery pipeline, a second waste heat recovery pipeline, a deoxidation and cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a hydrogen pipeline before cooling, and a pure hydrogen output pipeline; the crude hydrogen input pipeline is communicated with the deoxidation and cooling unit; the first waste heat recovery pipeline and the second waste heat recovery pipeline are both communicated between the deoxidation and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; the hydrogen pipeline before cooling is communicated between the deoxidation and cooling unit, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; the pure hydrogen output pipeline is connected to the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit.

2. The energy consumption optimization system based on the hydrogen purification process according to claim 1, wherein The deoxidation and cooling unit includes a crude hydrogen water separator, a deoxidation tower, a deoxidation cooler, a deoxidized process gas water separator, a compressor, and a throttle valve; the crude hydrogen water separator is communicated between the crude hydrogen input pipeline and the deoxidation tower; the deoxidation tower is communicated with the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the deoxidation cooler; the deoxidized process gas water separator is communicated between the deoxidation cooler and the hydrogen pipeline before cooling; the compressor is fixedly installed on the first waste heat recovery pipeline; the throttle valve is fixedly installed on the second waste heat recovery pipeline.

3. An energy consumption optimization system based on the hydrogen purification process according to claim 2, characterized in that, The first hydrogen cooling and drying unit includes a first pneumatic three-way ball valve, a first hydrogen gas-water separator before cooling, a first cooler, a first hydrogen pipeline after cooling, a first drying tower, a first hydrogen pipeline after drying, a first hydrogen pipeline switching valve, a second hydrogen pipeline switching valve, a first waste heat recovery pipeline switching valve, and a second waste heat recovery pipeline switching valve; the first pneumatic three-way ball valve is communicated between the first hydrogen gas-water separator before cooling, the hydrogen pipeline before cooling, the second hydrogen cooling and drying unit, and the second hydrogen cooling and drying unit; the first hydrogen gas-water separator before cooling is communicated with the first cooler; the first hydrogen pipeline after cooling is communicated between the first cooler and the first drying tower; the first drying tower is communicated with the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the first hydrogen pipeline after drying; the first hydrogen pipeline after drying is connected to the pure hydrogen output pipeline; the first hydrogen pipeline switching valve is fixedly installed on the first hydrogen pipeline after drying, the second hydrogen pipeline switching valve is fixedly installed on the first hydrogen pipeline after cooling, and both the first hydrogen pipeline switching valve and the second hydrogen pipeline switching valve are close to the first drying tower; the first waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, the second waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and both the first waste heat recovery pipeline switching valve and the second waste heat recovery pipeline switching valve are close to the first drying tower.

4. An energy consumption optimization system based on the hydrogen purification process according to claim 3, characterized in that, The second hydrogen cooling and drying unit includes a second pneumatic three-way ball valve, a second pre-cooling hydrogen gas-water separator, a second cooler, a second post-cooling hydrogen gas transmission pipeline, a second drying tower, a second post-drying hydrogen gas transmission pipeline, a third hydrogen pipeline switching valve, a fourth hydrogen pipeline switching valve, a third waste heat recovery pipeline switching valve, and a fourth waste heat recovery pipeline switching valve; the second pneumatic three-way ball valve is connected between the second pre-cooling hydrogen gas-water separator, the pre-cooling hydrogen gas transmission pipeline, the third hydrogen cooling and drying unit, and the first pneumatic three-way ball valve; the second pre-cooling hydrogen gas-water separator is connected to the second cooler; the second post-cooling hydrogen gas transmission pipeline is connected between the second cooler and the second drying tower; the second drying tower is connected to the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the second post-drying hydrogen gas transmission pipeline; the second post-drying hydrogen gas transmission pipeline is connected to the pure hydrogen output pipeline; the third hydrogen pipeline switching valve is fixedly installed on the second post-drying hydrogen gas transmission pipeline, the fourth hydrogen pipeline switching valve is fixedly installed on the second post-cooling hydrogen gas transmission pipeline, and both the third hydrogen pipeline switching valve and the fourth hydrogen pipeline switching valve are close to the second drying tower; the third waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, the fourth waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and both the third waste heat recovery pipeline switching valve and the fourth waste heat recovery pipeline switching valve are close to the second drying tower.

5. The energy consumption optimization system based on the hydrogen purification process according to claim 4, wherein, The third hydrogen cooling and drying unit includes a third pneumatic three-way ball valve, a third pre-cooling hydrogen gas-water separator, a third cooler, a third post-cooling hydrogen gas transmission pipeline, a third drying tower, a third post-drying hydrogen gas transmission pipeline, a fifth hydrogen pipeline switching valve, a sixth hydrogen pipeline switching valve, a fifth waste heat recovery pipeline switching valve, and a sixth waste heat recovery pipeline switching valve; the third pneumatic three-way ball valve is connected between the third pre-cooling hydrogen gas-water separator, the pre-cooling hydrogen gas transmission pipeline, the first pneumatic three-way ball valve, and the second pneumatic three-way ball valve; the third pre-cooling hydrogen gas-water separator is connected to the third cooler; the third post-cooling hydrogen gas transmission pipeline is connected between the third cooler and the third drying tower; the third drying tower is connected to the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the third post-drying hydrogen gas transmission pipeline; the third post-drying hydrogen gas transmission pipeline is connected to the pure hydrogen output pipeline; the fifth hydrogen pipeline switching valve is fixedly installed on the third post-drying hydrogen gas transmission pipeline, the sixth hydrogen pipeline switching valve is fixedly installed on the third post-cooling hydrogen gas transmission pipeline, and both the fifth hydrogen pipeline switching valve and the sixth hydrogen pipeline switching valve are close to the third drying tower; the fifth waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, the sixth waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and both the fifth waste heat recovery pipeline switching valve and the sixth waste heat recovery pipeline switching valve are close to the third drying tower.

6. An energy consumption optimization method based on the hydrogen purification process, which is applied to an energy consumption optimization system based on the hydrogen purification process according to any one of claims 1-5, characterized in that, The energy consumption optimization method based on the hydrogen purification process specifically includes the following steps: The crude hydrogen enters the deoxidation and cooling unit through the crude hydrogen input pipeline and undergoes deoxidation, preliminary cooling, and preliminary dehydration in sequence to obtain the primary treated hydrogen. The primary treated hydrogen enters the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit through the pre-cooling hydrogen transmission pipeline for secondary dehydration, secondary cooling, and drying to obtain pure hydrogen, and the pure hydrogen is output through the pure hydrogen output pipeline. During the process of drying the primary treated hydrogen by the first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit, waste heat is generated, and the waste heat is recovered to the deoxidation and cooling unit through the first waste heat recovery pipeline and the second waste heat recovery pipeline for the deoxidation reaction of the deoxidation and cooling unit.

7. The energy consumption optimization method based on the hydrogen purification process according to claim 6, wherein The specific methods for the deoxidation, preliminary cooling, and preliminary dehydration of the crude hydrogen are as follows: The crude hydrogen undergoes preliminary dehydration through the crude hydrogen water separator, deoxidation through the deoxidation tower, preliminary cooling through the deoxidation cooler, and optimization of the deoxidation and preliminary dehydration effects through the deoxidation process gas water separator in sequence.

8. The energy consumption optimization method based on the hydrogen purification process according to claim 6, wherein, The specific methods for the secondary dehydration, secondary cooling, and drying of the primary treated hydrogen in sequence are as follows: The primary treated hydrogen enters the first pre-cooling hydrogen gas-water separator / the second pre-cooling hydrogen gas-water separator / the third pre-cooling hydrogen gas-water separator through the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve in sequence through the pre-cooling hydrogen transmission pipeline for secondary dehydration, undergoes secondary cooling through the first cooler / the second cooler / the third cooler, and undergoes drying through the first drying tower / the second drying tower / the third drying tower.

9. A method for optimizing energy consumption based on the hydrogen purification process according to claim 8, wherein, During the process of secondary cooling dehydration, secondary cooling, and drying of the primary treated hydrogen, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling unit continuously alternate among the adsorption drying stage, the heating regeneration stage, and the cooling stage; among them: Adsorption drying stage: After the primary treated hydrogen undergoes secondary cooling through the first cooler / the second cooler / the third cooler, it enters the first drying tower / the second drying tower / the third drying tower through the first post-cooling hydrogen transmission pipeline / the second post-cooling hydrogen transmission pipeline / the third post-cooling hydrogen transmission pipeline and is adsorbed and dried by the desiccant attached to the outer side of the internal coil to obtain pure hydrogen and output it through the pure hydrogen output pipeline. Heating regeneration stage: By heating the desiccant inside the first drying tower / the second drying tower / the third drying tower, the moisture absorbed by the desiccant is evaporated to ensure the activity of the desiccant. Cooling stage: The heat released in the adsorption drying stage and the heating regeneration stage is absorbed by the refrigerant inside the first drying tower / the second drying tower / the third drying tower, and the refrigerant is evaporated into gaseous refrigerant. The gaseous refrigerant enters the deoxidation tower through the first waste heat recovery pipeline after being increased in temperature and pressure by the compressor to provide heat for the deoxidation of the deoxidation tower. The gaseous refrigerant becomes liquid refrigerant after heat exchange in the deoxidation process, and the liquid refrigerant enters the first drying tower / the second drying tower / the third drying tower through the second waste heat recovery pipeline and the throttle valve.

10. A method for optimizing energy consumption based on the hydrogen purification process according to claim 9, characterized in that, In the adsorption drying stage, the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve opens the channel between the hydrogen delivery pipeline before cooling and the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve; the first hydrogen pipeline switching valve, the second hydrogen pipeline switching valve / the third hydrogen pipeline switching valve, the fourth hydrogen pipeline switching valve / the fifth hydrogen pipeline switching valve, the sixth hydrogen pipeline switching valve open; the first waste heat recovery pipeline switching valve, the second waste heat recovery pipeline switching valve / the third waste heat recovery pipeline switching valve, the fourth waste heat recovery pipeline switching valve / the fifth waste heat recovery pipeline switching valve, the sixth waste heat recovery pipeline switching valve close; in the cooling stage and the heating regeneration stage, the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve closes the channel between the hydrogen delivery pipeline before cooling and the first pneumatic three-way ball valve / the second pneumatic three-way ball valve / the third pneumatic three-way ball valve; the first hydrogen pipeline switching valve, the second hydrogen pipeline switching valve / the third hydrogen pipeline switching valve, the fourth hydrogen pipeline switching valve / the fifth hydrogen pipeline switching valve, the sixth hydrogen pipeline switching valve close; the first waste heat recovery pipeline switching valve, the second waste heat recovery pipeline switching valve / the third waste heat recovery pipeline switching valve, the fourth waste heat recovery pipeline switching valve / the fifth waste heat recovery pipeline switching valve, the sixth waste heat recovery pipeline switching valve open.

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