An energy consumption optimization system and method based on a hydrogen purification process

Abstract

The application provides an energy consumption optimization system and method based on a hydrogen purification process, and relates to the technical field of hydrogen production by water electrolysis.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 deoxidization 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 in communication with the deoxidization cooling unit.The first waste heat recovery pipeline and the second waste heat recovery pipeline are both in communication between the deoxidization 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 application has the beneficial effect of reducing the energy loss of the hydrogen purification process and improving the energy utilization efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water electrolysis hydrogen production, and more particularly to an energy consumption optimization system and method based on a hydrogen purification process. BACKGROUND

[0002] With the increasing consumption of traditional fossil energy, environmental pollution and carbon emission pressure are also increasing, and exploring a green transformation path has become a global consensus. Hydrogen energy, as a highly potential new 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 low loss, which provides an effective way to solve environmental pollution and climate change problems.

[0003] With the wide application of hydrogen energy in the energy field, exploring an efficient hydrogen production method has become the core issue of hydrogen energy development. Among many hydrogen production technologies, water electrolysis hydrogen production has a wide range of raw material sources, relatively mild reaction conditions, and is easy to control and operate, which is conducive to realizing industrialized production. In addition, with the increase of renewable energy installed capacity, renewable energy generation is gradually combined with water electrolysis hydrogen production to become one of the power sources for water electrolysis hydrogen production. Water electrolysis hydrogen production technology is of key significance to the low-carbon development of the hydrogen production link, provides strong support for building a green and low-carbon energy system, effectively solves the problem of renewable energy consumption, and improves the stability and reliability of the energy system.

[0004] Because of the coexistence of gas and liquid in the hydrogen production reaction electrolytic tank, the generated hydrogen gas will carry oxygen and liquid 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 of deoxidation, cooling and drying. The main impurities in crude hydrogen are oxygen and water vapor. In the deoxidation tower, hydrogen is heated by an electric heater, and when it flows through the catalyst, hydrogen reacts with oxygen to generate water vapor, which is condensed in the subsequent cooler and removed by a gas-water separator to remove oxygen impurities in the hydrogen. The deoxidized gas is cooled by a cooler and then enters a drying tower to remove water vapor impurities. After the drying agent in the drying tower is saturated with water, it needs to be heated by an electric heater to evaporate the water to regenerate the drying agent, and finally the temperature is reduced by a natural cooling process to 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 the natural cooling process releases a large amount of waste heat, resulting in a large amount of energy loss.

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

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

[0007] The technical scheme adopted by the present application to solve its technical problems is: an energy consumption optimization system based on a hydrogen purification process, which is improved in that 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 deoxidation cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a pre-cooling hydrogen conveying pipeline, and a pure hydrogen output pipeline; the crude hydrogen input pipeline is in communication with the deoxidation cooling unit; the first waste heat recovery pipeline and the second waste heat recovery pipeline are both in communication 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; the pre-cooling hydrogen conveying pipeline is in communication 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; and the pure hydrogen output pipeline is in communication with 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 cooling unit comprises a crude hydrogen water separator, a deoxidation tower, a deoxidation cooler, a deoxidation process gas water separator, a compressor, and a throttle valve; the crude hydrogen water separator is in communication between the crude hydrogen input pipeline and the deoxidation tower; the deoxidation tower is in communication with the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the deoxidation cooler; the deoxidation process gas water separator is in communication between the deoxidation cooler and the pre-cooling hydrogen conveying pipeline; the compressor is fixedly installed on the first waste heat recovery pipeline; and 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 comprises a first pneumatic three-ball valve, a first cooling-pre hydrogen gas-water separator, a first cooler, a first cooling-post hydrogen conveying pipeline, a first drying tower, a first drying-post hydrogen conveying pipeline, 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-ball valve is communicated between the first cooling-pre hydrogen gas-water separator, a cooling-pre hydrogen conveying pipeline, a second hydrogen cooling and drying unit and a second hydrogen cooling and drying unit; the first cooling-pre hydrogen gas-water separator is communicated with the first cooler; the first cooling-post hydrogen conveying pipeline is communicated between the first cooler and the first drying tower; the first drying tower is communicated with a first waste heat recovery pipeline, a second waste heat recovery pipeline and the first drying-post hydrogen conveying pipeline; the first drying-post hydrogen conveying pipeline is communicated with a pure hydrogen output pipeline; the first hydrogen pipeline switching valve is fixedly installed on the first drying-post hydrogen conveying pipeline, the second hydrogen pipeline switching valve is fixedly installed on the first cooling-post hydrogen conveying pipeline, and the first hydrogen pipeline switching valve and the second hydrogen pipeline switching valve are both 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 the first waste heat recovery pipeline switching valve and the second waste heat recovery pipeline switching valve are both close to the first drying tower.

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

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

[0012] An energy consumption optimization method based on a hydrogen purification process is applied to the energy consumption optimization system based on the hydrogen purification process, and the improvement lies in that the energy consumption optimization method based on the hydrogen purification process specifically comprises the following steps:

[0013] The crude hydrogen enters the deoxidization and cooling unit through the crude hydrogen input pipeline to be deoxidized, preliminarily cooled and preliminarily dehydrated to obtain the primary processed hydrogen;

[0014] The primary processed hydrogen enters the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit through the cooling front hydrogen conveying pipeline to be secondarily dehydrated, secondarily cooled and dried to obtain the pure hydrogen, and the pure hydrogen is output through the pure hydrogen output pipeline;

[0015] The first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit generates waste heat in the process of drying the primary processed hydrogen, and the waste heat is recovered to the deoxidization and cooling unit through the first waste heat recovery pipeline and the second waste heat recovery pipeline to supply the deoxidization and cooling unit to perform the deoxidization reaction.

[0016] Further, the specific way of deoxidizing, primary cooling and primary dehydration of the crude hydrogen is that the crude hydrogen is sequentially subjected to primary dehydration in a crude hydrogen gas-water separator, deoxidization in a deoxidization tower, primary cooling in a deoxidization cooler, and optimized deoxidization and primary dehydration in a deoxidization process gas-water separator.

[0017] Further, the specific way of secondary dehydration, secondary cooling and drying of the primary processed hydrogen is that the primary processed hydrogen is sequentially subjected to secondary dehydration in the first / second / third cooling front hydrogen gas-water separator, secondary cooling in the first / second / third cooler, and drying in the first / second / third drying tower.

[0018] Further, in the process of secondary cooling and dehydration, secondary cooling and drying of the primary processed hydrogen, the first / second / third hydrogen cooling and drying unit alternately performs the adsorption drying stage, the heating regeneration stage and the cooling stage; wherein:

[0019] The adsorption drying stage: after the primary processed hydrogen is subjected to secondary cooling in the first / second / third cooler, the hydrogen is introduced into the first / second / third drying tower through the first / second / third cooling rear hydrogen conveying pipeline to be adsorbed and dried by the drying agent attached to the outside of the internal coil, so as to obtain pure hydrogen which is output through the pure hydrogen output pipeline.

[0020] The heating regeneration stage: the drying agent in the first / second / third drying tower is heated to evaporate the absorbed water in the drying agent, so as to ensure the activity of the drying agent.

[0021] The cooling stage: the heat released in the adsorption drying stage and the heating regeneration stage is absorbed by the refrigerant in the first / second / third drying tower, the refrigerant is evaporated into gaseous refrigerant, the gaseous refrigerant is introduced into the deoxidization tower through the first waste heat recovery pipeline after being raised in temperature and pressure by the compressor, so as to provide heat for the deoxidization of the deoxidization tower, the gaseous refrigerant is changed into liquid refrigerant after heat exchange in the deoxidization process, and the liquid refrigerant is introduced into the first / second / third drying tower through the second waste heat recovery pipeline after being throttled by the throttle valve.

[0022] Further, in the adsorption drying stage, the first pneumatic three-ball valve / second pneumatic three-ball valve / third pneumatic three-ball valve opens the channel between the pre-cooling hydrogen delivery pipeline and the first pneumatic three-ball valve / second pneumatic three-ball valve / third pneumatic three-ball valve; the first hydrogen pipeline switching valve, the second hydrogen pipeline switching valve / third hydrogen pipeline switching valve, the fourth hydrogen pipeline switching valve / fifth hydrogen pipeline switching valve, and the sixth hydrogen pipeline switching valve are opened; the first waste heat recovery pipeline switching valve, the second waste heat recovery pipeline switching valve / third waste heat recovery pipeline switching valve, the fourth waste heat recovery pipeline switching valve / fifth waste heat recovery pipeline switching valve, and the sixth waste heat recovery pipeline switching valve are closed; in the cooling stage and the heating regeneration stage, the first pneumatic three-ball valve / second pneumatic three-ball valve / third pneumatic three-ball valve closes the channel between the pre-cooling hydrogen delivery pipeline and the first pneumatic three-ball valve / second pneumatic three-ball valve / third pneumatic three-ball valve; the first hydrogen pipeline switching valve, the second hydrogen pipeline switching valve / third hydrogen pipeline switching valve, the fourth hydrogen pipeline switching valve / fifth hydrogen pipeline switching valve, and the sixth hydrogen pipeline switching valve are closed; the first waste heat recovery pipeline switching valve, the second waste heat recovery pipeline switching valve / third waste heat recovery pipeline switching valve, the fourth waste heat recovery pipeline switching valve / fifth waste heat recovery pipeline switching valve, and the sixth waste heat recovery pipeline switching valve are opened.

[0023] The present application has the following advantages: the present application recovers the waste heat generated in the drying process of hydrogen in 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 and the second waste heat recovery pipeline, and delivers the waste heat to the deoxidization cooling unit to maintain the reaction temperature of the deoxidization reaction, thereby reducing the energy loss of the hydrogen purification process and improving the energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a hydrogen purification process energy consumption optimization system according to the present application;

[0025] Figure 2 FIG. 1 is a structural schematic diagram of a hydrogen purification process energy consumption optimization system according to the present application; DETAILED DESCRIPTION

[0026] The present application will be further described below in conjunction with the drawings and examples.

[0027] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purposes, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. In addition, all the coupling / connection relations involved in the patent do not mean that the components are directly connected, but means that the more optimal coupling structure can be composed by adding or reducing the coupling accessories according to the specific implementation. The technical features in the present application can be combined interactively without conflict.

[0028] Referring to Figure 1 The present application discloses an energy consumption optimization system based on a hydrogen purification process, which comprises a crude hydrogen input pipeline 1, a first waste heat recovery pipeline 8, a second waste heat recovery pipeline 9, a deoxidizing cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a pre-cooling hydrogen conveying pipeline 10 and a pure hydrogen output pipeline 41. The crude hydrogen input pipeline 1 is connected with the deoxidizing cooling unit. The first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 are connected between the deoxidizing 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 pre-cooling hydrogen conveying pipeline 10 is connected between the deoxidizing 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 with the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit and the third hydrogen cooling and drying unit.

[0029] It should be noted that in the embodiment, the crude hydrogen input pipeline 1 is used to input crude hydrogen into the deoxidizing cooling unit; the deoxidizing cooling unit is used to sequentially deoxidize, preliminarily cool and preliminarily dehydrate the crude hydrogen to obtain primary processed hydrogen; the hydrogen before cooling conveying pipeline 10 is used to input the primary processed hydrogen into the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / 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 secondarily dehydrate, secondarily cool and dry the primary processed 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 in the process of drying the primary processed hydrogen; the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 are used to convey the waste heat to the deoxidizing cooling unit to maintain the reaction temperature of the deoxidizing reaction; the pure hydrogen output pipeline 41 is used to output the pure hydrogen to enter the next process; in the implementation of the present application, first, the crude hydrogen enters the deoxidizing cooling unit through the crude hydrogen input pipeline 1 to sequentially deoxidize, preliminarily cool and preliminarily dehydrate the crude hydrogen to obtain primary processed hydrogen; then, the primary processed hydrogen enters the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit through the hydrogen before cooling conveying pipeline 10 to secondarily dehydrate, secondarily cool and dry the primary processed hydrogen 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 / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit will generate waste heat in the process of drying the primary processed hydrogen, and the waste heat is recovered to the deoxidizing cooling unit through the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 for the deoxidizing reaction of the deoxidizing cooling unit; in this process, the energy consumption optimization system based on the hydrogen purification process can recover the waste heat generated in the process of drying the 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 convey the waste heat to the deoxidizing cooling unit to maintain the reaction temperature of the deoxidizing reaction, so that the embodiment can reduce the energy loss of the hydrogen purification process and improve the energy utilization efficiency.

[0030] With reference to the Figure 1 As shown in the figure, the deoxidizing cooling unit comprises a crude hydrogen water separator 2, a deoxidizing tower 3, a deoxidizing cooler 4, a deoxidizing process gas water separator 5, a compressor 6 and a throttle valve 7; the crude hydrogen water separator 2 is communicated between the crude hydrogen input pipeline 1 and the deoxidizing tower 3; the deoxidizing tower 3 is communicated with the first waste heat recovery pipeline 8, the second waste heat recovery pipeline 9 and the deoxidizing cooler 4; the deoxidizing process gas water separator 5 is communicated between the deoxidizing cooler 4 and the hydrogen before cooling conveying pipeline 10; the compressor 6 is fixedly installed on the first waste heat recovery pipeline 8; and the throttle valve 7 is fixedly installed on the second waste heat recovery pipeline 9.

[0031] It should be noted that in the present embodiment, the hydrogen production reaction electrolyzer coexists with gas and liquid, and the generated hydrogen gas entrains oxygen and liquid droplets. The gas is the raw gas in the present embodiment, i.e., crude hydrogen. The crude hydrogen gas-water separator 2 is used to remove water vapor or liquid water in the raw gas by condensation or filtration, etc., to ensure that the gas sent to the deoxidation tower 3 is relatively dry, reducing the burden of subsequent processing. The deoxidation tower 3 is used to remove oxygen in the raw gas. Specifically, the deoxidation tower 3 can remove oxygen molecules in the gas by adsorption or catalysis to remove oxygen from the raw gas to meet the requirements of downstream processing or use. The deoxidation cooler 4 is used to reduce the temperature of the gas after deoxidation. The deoxidation process gas-water separator 5 is used to further remove water in the cooled gas. Even in the deoxidation and cooling process, the gas may still contain water vapor or a small amount of liquid water. The deoxidation process gas-water separator 5 can further remove water in the cooled gas to optimize the dehydrating and deoxidizing effect of the deoxidation cooling unit to obtain primary processed hydrogen. The compressor 6 is used to pressurize and warm 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 by 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 throttling valve 7 is used to prevent heat loss in the deoxidation tower 3. When the deoxidation tower 3 performs a deoxidation reaction, the throttling valve 7 is closed. When the deoxidation tower 3 performs a deoxidation reaction, the gaseous refrigerant becomes a liquid refrigerant. At this time, the throttling 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.

[0032] It should be noted that in the present embodiment, the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit are provided with liquid refrigerant. The liquid refrigerant is used to absorb the heat emitted by the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit during natural cooling. After absorption, the liquid refrigerant becomes a gaseous refrigerant that is input to the deoxidation tower 3 through the first waste heat delivery pipeline.

[0033] Continuing to refer to Figure 1As shown, the first hydrogen cooling and drying unit includes a first pneumatic three-ball valve 11, a first hydrogen gas-water separator before cooling 12, a first cooler 13, a first hydrogen delivery pipeline after cooling 14, a first drying tower 15, a first hydrogen delivery pipeline after drying 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-ball valve 11 is connected between the first hydrogen gas-water separator before cooling 12, the hydrogen delivery pipeline before cooling 10, the second hydrogen cooling and drying unit and the second hydrogen cooling and drying unit; the first hydrogen gas-water separator before cooling 12 and The first cooler 13 is connected; the first cooled hydrogen delivery 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 dried hydrogen delivery pipeline 16; the first dried hydrogen delivery pipeline 16 is connected to the pure hydrogen output pipeline 41; the first hydrogen pipeline switching valve 19 is fixedly installed on the first dried hydrogen delivery pipeline 16, and the second hydrogen pipeline switching valve 20 is fixedly installed on the first cooled hydrogen delivery pipeline 14, and the first hydrogen pipeline switching valve 19 and the second hydrogen pipeline switching valve 20 are both close to the first drying tower 1 5; The first waste heat recovery pipeline switching valve 17 is fixedly installed on the first waste heat recovery pipeline 8, and the second waste heat recovery pipeline switching valve 18 is fixedly installed on the second waste heat recovery pipeline 9, and the first waste heat recovery pipeline switching valve 17 and the second waste heat recovery pipeline switching valve 18 are both close to the first drying tower 15; the second hydrogen cooling and drying unit includes a second pneumatic three-ball valve 21, a second hydrogen gas-water separator 22 before cooling, a second cooler 23, a second hydrogen delivery pipeline 24 after cooling, a second drying tower 25, a second hydrogen delivery pipeline 26 after drying, a third hydrogen pipeline switching valve 29, a fourth hydrogen pipeline switching valve 30, a third waste heat recovery pipeline switching valve 31, a third hydrogen pipeline switching valve 32, a third hydrogen pipeline switching valve 33, a third hydrogen pipeline switching valve 34, a third hydrogen pipeline switching valve 35, a third hydrogen pipeline switching valve 36, a third hydrogen pipeline switching valve 37, a third hydrogen pipeline switching valve 38, a third hydrogen pipeline switching valve 39, a third hydrogen pipeline switching valve 40, a third hydrogen pipeline switching valve 41, a third hydrogen pipeline switching valve 42, a third hydrogen pipeline switching valve 43, a third hydrogen pipeline switching valve 44, a third hydrogen pipeline switching valve 45, a third hydrogen pipeline switching valve 46, a third hydrogen pipeline switching valve 47, a third hydrogen pipeline switching valve 48, a third hydrogen pipeline switching valve 49, a third hydrogen pipeline switching valve 50, a third hydrogen pipeline switching valve 51, a third hydrogen pipeline switching valve 52, a third hydrogen pipeline switching valve 53, a third hydrogen pipeline switching valve 54, a third hydrogen pipeline switching valve 55, a third hydrogen pipeline switching valve 56, a third hydrogen pipeline switching valve 57, a third hydrogen pipeline switching valve 58, a third hydrogen pipeline switching valve 59, a third hydrogen pipeline switching valve 5 The switching valve 27 and the fourth waste heat recovery pipeline switching valve 28; the second pneumatic three-ball valve 21 is connected between the second pre-cooling hydrogen gas-water separator 22, the pre-cooling hydrogen delivery pipeline 10, the third hydrogen cooling and drying unit and the first pneumatic three-ball valve 11; the second pre-cooling hydrogen gas-water separator 22 is connected to the second cooler 23; the second post-cooling hydrogen delivery 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 delivery pipeline 26; the second post-drying hydrogen delivery pipeline 26 is connected to the pure hydrogen output pipeline 41;The third hydrogen pipeline switching valve 29 is fixedly installed on the second dried hydrogen conveying pipeline 26, the fourth hydrogen pipeline switching valve 30 is fixedly installed on the second cooled hydrogen conveying pipeline 24, and the third hydrogen pipeline switching valve 29 and the fourth hydrogen pipeline switching valve 30 are both 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, the fourth waste heat recovery pipeline switching valve 28 is fixedly installed on the second waste heat recovery pipeline 9, and the third waste heat recovery pipeline switching valve 27 and the fourth waste heat recovery pipeline switching valve 28 are both close to the second drying tower 25; the third hydrogen cooling and drying unit comprises a third pneumatic three-ball valve 31, a third pre-cooling hydrogen gas-water separator 32, a third cooler 33, a third cooled hydrogen conveying pipeline 34, a third drying tower 35, a third dried hydrogen conveying pipeline 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-ball valve 31 is communicated between the third pre-cooling hydrogen gas-water separator 32, the pre-cooling hydrogen conveying pipeline 10, the first pneumatic three-ball valve 11, and the second pneumatic three-ball valve 21; the third pre-cooling hydrogen gas-water separator 32 is communicated with the third cooler 33; the third cooled hydrogen conveying pipeline 34 is communicated between the third cooler 33 and the third drying tower 35; the third drying tower 35 is communicated with the first waste heat recovery pipeline 8, the second waste heat recovery pipeline 9, and the third dried hydrogen conveying pipeline 36; the third dried hydrogen conveying pipeline 36 is communicated with a pure hydrogen output pipeline 41; the fifth hydrogen pipeline switching valve 39 is fixedly installed on the third dried hydrogen conveying pipeline 36, the sixth hydrogen pipeline switching valve 40 is fixedly installed on the third cooled hydrogen conveying pipeline 34, and the fifth hydrogen pipeline switching valve 39 and the sixth hydrogen pipeline switching valve 40 are both 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, the sixth waste heat recovery pipeline switching valve 38 is fixedly installed on the second waste heat recovery pipeline 9, and the fifth waste heat recovery pipeline switching valve 37 and the sixth waste heat recovery pipeline switching valve 38 are both close to the third drying tower 35.

[0034] It should be noted that in the embodiment, the first pneumatic three-ball valve 11, the second pneumatic three-ball valve 21 and the third pneumatic three-ball valve 31 are respectively used for controlling the opening and closing of the passages between the cooling front hydrogen conveying pipeline 10 and the first cooling front hydrogen gas-water separator 12, the second cooling front hydrogen gas-water separator 22 and the third cooling front hydrogen gas-water separator 32, and in the specific implementation process, only one of the three passages between the cooling front hydrogen conveying pipeline 10 and the first cooling front hydrogen gas-water separator 12 and the second cooling front hydrogen gas-water separator 22 is open; the first cooling front hydrogen gas-water separator 12, the second cooling front hydrogen gas-water separator 22 and the third cooling front hydrogen gas-water separator 32 are all used for secondary dewatering treatment of the primary treatment hydrogen; the first cooler 13, the second cooler 23 and the third cooler 33 are all used for secondary cooling treatment of the dewatered primary treatment hydrogen; the first cooling rear hydrogen conveying pipeline 14, the second cooling rear hydrogen conveying pipeline 24 and the third cooling rear hydrogen conveying pipeline 34 are respectively used for conveying the secondary dewatering treatment and secondary cooling treatment hydrogen 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 secondary dewatering treatment and secondary cooling treatment hydrogen; the first drying rear hydrogen conveying pipeline 16, the second drying rear hydrogen conveying pipeline 26 and the third drying rear hydrogen conveying pipeline 36 are respectively used for conveying the pure hydrogen prepared by 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 for adapting to the process stage of the first drying tower 15, when the drying agent in the first drying tower 15 is used for adsorption drying of the primary treatment hydrogen, 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 drying agent in the first drying tower 15 is heated for regeneration, 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 drying agent 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 stage of the second drying tower 25. When the primary treated hydrogen is dried by the drying agent in the second drying tower 25, 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 drying agent in the second drying tower 25 is heated and regenerated, 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 stage of the third drying tower 35. When the primary treated hydrogen is dried by the drying agent in the third drying tower 35, 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 drying agent in the third drying tower 35 is heated and regenerated, 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 drying agent 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.

[0035] Referring to Figure 2 As shown in the drawings, the application also discloses an energy consumption optimization method based on a hydrogen purification process, which is applied to the energy consumption optimization system based on the hydrogen purification process and specifically comprises the following steps:

[0036] S10, the crude hydrogen enters the deoxidizing cooling unit through the crude hydrogen input pipeline 1 to perform deoxidization, preliminary cooling and preliminary dehydration in sequence to obtain primary treated hydrogen. Specifically, the specific mode of deoxidization, preliminary cooling and preliminary dehydration of the crude hydrogen is that the crude hydrogen is subjected to preliminary dehydration through the crude hydrogen water separator 2, deoxidization through the deoxidizing tower 3, preliminary cooling through the deoxidizing cooler 4, and optimization of the deoxidization and preliminary dehydration effects through the deoxidizing process gas water separator 5.

[0037] S20, the primary treatment hydrogen enters the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit through the cooling hydrogen delivery pipeline 10 before cooling 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 mode of the primary treatment hydrogen for secondary dehydration, secondary cooling and drying is that the primary treatment hydrogen enters the first cooling hydrogen gas-water separator 12 / second cooling hydrogen gas-water separator 22 / third cooling hydrogen gas-water separator 32 through the cooling hydrogen delivery pipeline 10 before cooling through the first pneumatic three-ball valve 11 / second pneumatic three-ball valve 21 / third pneumatic three-ball valve 31 for secondary dehydration, through the first cooler 13 / second cooler 23 / third cooler 33 for secondary cooling, and through the first drying tower 15 / second drying tower 25 / third drying tower 35 for drying;

[0038] S30, the first hydrogen cooling and drying unit / second hydrogen cooling and drying unit / third hydrogen cooling and drying unit produces waste heat in the process of drying the primary treatment hydrogen, 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 reaction of the deoxidation cooling unit.

[0039] It should be noted that in the embodiment, the energy consumption optimization system based on the hydrogen purification process can realize the purification of crude hydrogen in the process, and the heat emitted in 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 is recovered through the first waste heat recovery pipeline 8 and the second waste heat recovery pipeline 9 and is transported to the deoxidation cooling unit to maintain the reaction temperature for the deoxidation reaction, thereby achieving the effect of reducing the energy consumption of the hydrogen purification process and improving the energy utilization efficiency.

[0040] Further, in the process of secondary cooling and dehydration, secondary cooling and drying of the primary treatment hydrogen, the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling unit alternately perform the adsorption drying stage, the heating regeneration stage and the cooling stage; wherein:

[0041] The adsorption drying stage: after the primary treatment hydrogen is secondarily cooled by the first cooler 13 / second cooler 23 / third cooler 33, it enters the first drying tower 15 / second drying tower 25 / third drying tower 35 through the first cooling hydrogen delivery pipeline 14 / second cooling hydrogen delivery pipeline 24 / third cooling hydrogen delivery pipeline 34 to be adsorbed and dried by the drying agent attached to the outside of the internal coil to obtain pure hydrogen and output through the pure hydrogen output pipeline 41;

[0042] Heating regeneration stage: by heating the desiccant inside the first drying tower 15 / second drying tower 25 / third drying tower 35, the absorbed water in the desiccant is evaporated to ensure the activity of the desiccant;

[0043] Cooling stage: the heat released by 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, the gaseous refrigerant is lifted in temperature and pressure by the first waste heat recovery pipeline 8 through the compressor 6 and then enters the deoxidation tower 3 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 second waste heat recovery pipeline 9 through the throttling valve 7.

[0044] It should be noted that in the present embodiment, 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 cooling front hydrogen gas conveying pipeline 10, the first pneumatic three-ball valve 11 and the third pneumatic three-ball valve 31 are closed respectively to shut the passage between the cooling front hydrogen gas conveying pipeline 10 and the first cooling front hydrogen gas and water separator 12 and the third cooling front hydrogen gas and water separator 32; the second pneumatic three-ball valve 21 is opened to open the passage between the cooling front hydrogen gas conveying pipeline 10 and the second cooling front hydrogen gas and water separator 22; the primary treated hydrogen gas passes through the second cooling front hydrogen gas and water separator 22, the second cooler 23 and the second cooling back hydrogen gas conveying pipeline 24 into the second drying tower 25 in sequence, and the moisture in the primary treated hydrogen gas is absorbed by the drying agent in the drying tower, at this time, the primary treated hydrogen gas is absorbed by the drying agent and becomes pure hydrogen, the pure hydrogen is conveyed to the hydrogen gas output pipeline through the second drying back hydrogen gas conveying pipeline 26 and is output into the next process, and the drying agent releases heat in the adsorption drying process, the liquid refrigerant in the internal coil of the second drying tower 25 absorbs the heat generated in the adsorption drying process of the drying agent attached to the outside of the internal coil of the second drying tower 25, at this time, the liquid refrigerant becomes 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 in the process to reach the required temperature of the deoxidation reaction; on the other hand, the first waste heat recovery pipeline switch valve 17 and the second waste heat recovery pipeline switch valve 18 are opened, the third waste heat recovery pipeline switch valve 27 and the fourth waste heat recovery pipeline switch valve 28 are opened, and the fifth waste heat recovery pipeline switch valve 37 and the sixth waste heat recovery pipeline switch valve 38 are closed; at this time, the first drying tower 15 is in the cooling stage, the liquid refrigerant in the first drying tower 15 absorbs the waste heat of the drying agent attached to the outside of the internal coil of the first drying tower 15 after heating, at this time, the liquid refrigerant becomes 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 in the process to reach the required temperature of the deoxidation reaction; in addition, the third drying tower 35 is in the heating regeneration stage, since the process stages of the first drying tower 15, the second drying tower 25 and the third drying tower 35 are constantly alternating, the drying agent in the third drying tower 35 absorbs too much moisture in the previous process of switching to adsorption drying, and needs to evaporate the absorbed moisture by heating the drying agent to ensure the activity of the drying agent and prepare for the subsequent alternation; in the process of heating, the moisture in the drying agent is evaporated to ensure the drying effect of the drying agent.In 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 in the heating regeneration stage and the cooling stage to the deoxidation reaction in the deoxidation tower 3, and the compressor 6 only warms up and pressurizes the recovered heat, without directly converting electricity into heat. Therefore, the embodiment can reduce the energy loss of the hydrogen purification process and improve the energy utilization efficiency.

[0045] Further, in the adsorption drying stage, the first pneumatic three-ball valve 11 / second pneumatic three-ball valve 21 / third pneumatic three-ball valve 31 opens the channel between the pre-cooling hydrogen delivery pipeline 10 and the first pneumatic three-ball valve 11 / second pneumatic three-ball valve 21 / third pneumatic three-ball valve 31; the first hydrogen pipeline switching valve 19, the second hydrogen pipeline switching valve 20 / third hydrogen pipeline switching valve 29, the fourth hydrogen pipeline switching valve 30 / fifth hydrogen pipeline switching valve 39, and the sixth hydrogen pipeline switching valve 40 are opened; the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18 / third waste heat recovery pipeline switching valve 27, the fourth waste heat recovery pipeline switching valve 28 / fifth waste heat recovery pipeline switching valve 37, and the sixth waste heat recovery pipeline switching valve 38 are closed; in the cooling stage and the heating regeneration stage, the first pneumatic three-ball valve 11 / second pneumatic three-ball valve 21 / third pneumatic three-ball valve 31 closes the channel between the pre-cooling hydrogen delivery pipeline 10 and the first pneumatic three-ball valve 11 / second pneumatic three-ball valve 21 / third pneumatic three-ball valve 31; the first hydrogen pipeline switching valve 19, the second hydrogen pipeline switching valve 20 / third hydrogen pipeline switching valve 29, the fourth hydrogen pipeline switching valve 30 / fifth hydrogen pipeline switching valve 39, and the sixth hydrogen pipeline switching valve 40 are closed; the first waste heat recovery pipeline switching valve 17, the second waste heat recovery pipeline switching valve 18 / third waste heat recovery pipeline switching valve 27, the fourth waste heat recovery pipeline switching valve 28 / fifth waste heat recovery pipeline switching valve 37, and the sixth waste heat recovery pipeline switching valve 38 are opened.

[0046] It should be noted that in the embodiment, the first hydrogen pipeline switching valve 19, the second hydrogen pipeline switching valve 20, the third hydrogen pipeline switching valve 29, the fourth hydrogen pipeline switching valve 30, the fifth hydrogen pipeline switching valve 39, the sixth hydrogen 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 be opened and closed alternately to adapt to the alternation of the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling unit between the adsorption drying stage, the heating regeneration stage, and the cooling stage.

[0047] As a preferred embodiment, in combination with the above-mentioned system and method, the following is a detailed description of the specific working process of the present application in hydrogen purification:

[0048] Firstly, the crude hydrogen enters the deoxidizing cooling unit through the crude hydrogen input pipeline 1, and then sequentially passes through the crude hydrogen water separator 2 of the deoxidizing cooling unit for preliminary dehydration, the deoxidizing tower 3 for deoxidization, the deoxidizing cooler 4 for preliminary cooling, and the deoxidizing process gas water separator 5 for optimizing the deoxidization and preliminary dehydration effect, so as to obtain the primary processed hydrogen gas;

[0049] Then, the primary processed hydrogen gas enters the cooling front hydrogen gas conveying pipeline 10 and passes through the first pneumatic three-ball valve 11, the second pneumatic three-ball valve 21 and the third pneumatic three-ball valve 31. At this time, only one of the first pneumatic three-ball valve 11, the second pneumatic three-ball valve 21 and the third pneumatic three-ball valve 31 opens the channel between the hydrogen gas conveying pipeline 10 and the first hydrogen gas cooling and drying unit / second hydrogen gas cooling and drying unit / third hydrogen gas cooling and drying unit. Taking the first pneumatic three-ball valve 11, the second pneumatic three-ball valve 21 and the third pneumatic three-ball valve 31 as an example, when the first pneumatic three-ball valve 11 is opened, the second pneumatic three-ball valve 21 and the third pneumatic three-ball valve 31, the primary processed hydrogen gas sequentially passes through the first cooling front hydrogen gas water separator 12 for secondary dehydration treatment of the primary processed hydrogen gas, the first cooler 13 for secondary cooling of the primary processed hydrogen gas, and the first drying tower 15 for adsorption drying, so as to obtain pure hydrogen gas 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 undergo the heating regeneration stage and the cooling stage, and the adsorption drying stage, the heating regeneration stage and the cooling stage are constantly 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 gas pipeline switching valve 19 and the second hydrogen gas 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 gas pipeline switching valve 29, the fourth hydrogen gas pipeline switching valve 30, the fifth hydrogen gas pipeline switching valve 39 and the sixth hydrogen gas pipeline switching valve 40 are all closed. Among them,

[0050] In the adsorption drying stage, the first hydrogen pipeline switching valve 19 and the second hydrogen pipeline switching valve 20 are opened to send the primary processing hydrogen after secondary dehydration and secondary cooling to the first drying tower through the first cooled hydrogen delivery pipeline 14 for adsorption drying treatment to obtain pure hydrogen, and then send the pure hydrogen to the pure hydrogen output pipeline 41 through the first dried hydrogen delivery pipeline 16 and output; the first waste heat recovery pipeline switching valve 17 and the second waste heat recovery pipeline switching valve 18 are opened because the heat of the drying agent in the cooling process and the heat released by the drying agent in the adsorption drying process are all absorbed by the liquid refrigerant inside the coil of the first drying tower 15, and the liquid refrigerant will change from liquid to gas after absorbing enough heat, 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 deoxidizing tower, and exchange heat in the deoxidizing tower during the deoxidizing reaction process, and the gaseous refrigerant will change to liquid, at this time, the throttling valve 7 is opened, and the liquid refrigerant returns to the coil inside the first drying tower 15 through the second waste heat recovery pipeline 9; in the heating regeneration stage, when the drying agent adsorbs too much water, its adsorption effect will be reduced, and the embodiment is heated to evaporate the excess water in the drying agent, so as to ensure its drying effect; in 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 drying agent after the heating regeneration stage still has residual heat, at this time, the refrigerant will fully absorb the residual heat of the drying agent, and the liquid refrigerant will also change to gaseous refrigerant, at this time, the gaseous refrigerant will go through the same process as the heating regeneration stage, which will not be repeated here, and finally the liquid refrigerant flows back to the coil inside the third drying tower 35; and in the specific implementation of the above working process, the first drying tower 15, the second drying tower 25 and the third drying tower 35 will be cyclically staggered 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 application.

[0051] It also needs to be explained that the deoxidation reaction needs to maintain a high temperature above 75°C, the existing system relies on electric heater to realize temperature control, the electric heating conversion efficiency is often less than 90%, resulting in huge energy consumption of deoxidation reaction heating (about 50% of total energy consumption of hydrogen purification process); On the other hand, in order to maintain the drying efficiency and rate of the drying tower, the desiccant needs to be cooled in the drying process, the heat input in the heating regeneration stage and the heat released in the moisture drying are all discharged, the part of the heat is low in grade (<45°C), which cannot be directly reused. The present application can effectively absorb the low-grade waste heat of the first drying tower 15, the second drying tower 25 and the third drying tower 35 drying and natural cooling process by recycling waste heat, speed up the cooling rate of the drying tower, ensure the drying effect, and use the waste heat after improving the grade in the deoxidation reaction, thereby avoiding additional electric heating demand. Since the compressor 6 is only used to improve the heat energy grade and not directly convert electricity into heat, the energy efficiency can reach 400-600%, which is 4-6 times higher than the electric heater, thereby reducing the energy consumption of the hydrogen purification process by more than 40%.

[0052] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments, those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An energy consumption optimization system based on a 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 cooling unit, a first hydrogen cooling and drying unit, a second hydrogen cooling and drying unit, a third hydrogen cooling and drying unit, a pre-cooling hydrogen delivery pipeline, and a pure hydrogen output pipeline; the crude hydrogen input pipeline is connected to the deoxidation cooling unit; the first waste heat recovery pipeline and the second waste heat recovery pipeline are both connected 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; the pre-cooling hydrogen delivery pipeline is connected 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; the pure hydrogen output pipeline is all connected to the first hydrogen cooling and drying unit, the second hydrogen cooling and drying unit, and the third hydrogen cooling and drying unit; The deoxidation cooling unit includes a crude hydrogen gas-water separator, a deoxidation tower, a deoxidation cooler, a deoxidation process gas-water separator, a compressor, and a throttle valve; the crude hydrogen gas-water separator is connected between the crude hydrogen input pipeline and the deoxidation tower; the deoxidation tower is connected to the first waste heat recovery pipeline, the second waste heat recovery pipeline, and the deoxidation cooler; the deoxidation process gas-water separator is connected between the deoxidation cooler and the pre-cooling hydrogen delivery pipeline; 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; The first hydrogen cooling and drying unit includes a first pneumatic three-ball valve, a first hydrogen gas-water separator before cooling, a first cooler, a first hydrogen delivery pipeline after cooling, a first drying tower, a first hydrogen delivery 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-ball valve is connected between the first hydrogen gas-water separator before cooling, the hydrogen delivery 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 delivery pipeline after cooling is connected between the first cooler and the first drying tower; the first drying tower is connected to the first A waste heat recovery pipeline, a second waste heat recovery pipeline and a first hydrogen delivery pipeline after drying are connected; the first hydrogen delivery pipeline after drying is connected to the pure hydrogen output pipeline; the first hydrogen pipeline switching valve is fixedly installed on the first hydrogen delivery pipeline after drying, the second hydrogen pipeline switching valve is fixedly installed on the first hydrogen delivery pipeline after cooling, and the first hydrogen pipeline switching valve and the second hydrogen pipeline switching valve are both 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 the first waste heat recovery pipeline switching valve and the second waste heat recovery pipeline switching valve are both close to the first drying tower.

2. The energy consumption optimization system based on the hydrogen purification process according to claim 1 is characterized in that: The second hydrogen cooling and drying unit includes a second pneumatic three-ball valve, a second hydrogen gas-water separator before cooling, a second cooler, a second hydrogen delivery pipeline after cooling, a second drying tower, a second hydrogen delivery pipeline after drying, 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-ball valve is connected between the second hydrogen gas-water separator before cooling, the hydrogen delivery pipeline before cooling, the third hydrogen cooling and drying unit and the first pneumatic three-ball valve; the second hydrogen gas-water separator before cooling is connected to the second cooler; the second hydrogen delivery pipeline after cooling is connected between the second cooler and the second drying tower; the second drying tower is connected to the first The waste heat recovery pipeline, the second waste heat recovery pipeline and the second hydrogen delivery pipeline after drying are connected; the second hydrogen delivery pipeline after drying is connected to the pure hydrogen output pipeline; the third hydrogen pipeline switching valve is fixedly installed on the second hydrogen delivery pipeline after drying, and the fourth hydrogen pipeline switching valve is fixedly installed on the second hydrogen delivery pipeline after cooling, and the third hydrogen pipeline switching valve and the fourth hydrogen pipeline switching valve are both close to the second drying tower; the third waste heat recovery pipeline switching valve is fixedly installed on the first waste heat recovery pipeline, and the fourth waste heat recovery pipeline switching valve is fixedly installed on the second waste heat recovery pipeline, and the third waste heat recovery pipeline switching valve and the fourth waste heat recovery pipeline switching valve are both close to the second drying tower.

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

4. A method for optimizing energy consumption based on a hydrogen purification process, applied to an energy consumption optimization system based on a hydrogen purification process according to any one of claims 1 to 3, 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 succession 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 delivery pipeline for secondary dehydration, secondary cooling and drying to obtain pure hydrogen, which is then output through the pure hydrogen output pipeline; The first hydrogen cooling and drying unit / the second hydrogen cooling and drying unit / the third hydrogen cooling and drying unit generates waste heat in the process of drying the primary treated hydrogen, and the waste heat is recovered to the deoxygenation cooling unit through the first waste heat recovery pipeline and the second waste heat recovery pipeline to provide the deoxygenation cooling unit with deoxygenation reaction.

5. The energy consumption optimization method based on the hydrogen purification process according to claim 4, characterized in that: The specific method of deoxidation, preliminary cooling and preliminary dehydration of crude hydrogen is: the crude hydrogen is successively dehydrated by the crude hydrogen gas-water separator, deoxidized by the deoxidation tower, preliminarily cooled by the deoxidation cooler, and optimized for deoxidation and preliminary dehydration effects by the deoxidation process gas-water separator.

6. The energy consumption optimization method based on the hydrogen purification process according to claim 5, characterized in that: The specific manner in which the primary treated hydrogen is successively subjected to secondary dehydration, secondary cooling and drying is as follows: the primary treated hydrogen is successively passed through the pre-cooling hydrogen delivery pipeline through the first pneumatic three-ball valve / the second pneumatic three-ball valve / the third pneumatic three-ball valve into the first pre-cooling hydrogen gas-water separator / the second pre-cooling hydrogen gas-water separator / the third pre-cooling hydrogen gas-water separator for secondary dehydration, passed through the first cooler / the second cooler / the third cooler for secondary cooling, and dried through the first drying tower / the second drying tower / the third drying tower.

7. The energy consumption optimization method based on the hydrogen purification process according to claim 6, characterized in that: During the process 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 and drying unit continuously and alternately perform the adsorption drying stage, the heating regeneration stage and the cooling stage; wherein: Adsorption drying stage: The primary treated hydrogen is cooled twice in the first cooler / second cooler / third cooler, and then enters the first drying tower / second drying tower / third drying tower through the first cooled hydrogen delivery pipeline / second cooled hydrogen delivery pipeline / third cooled hydrogen delivery pipeline. It is adsorbed and dried by the desiccant attached to the outside 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 / second drying tower / 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 / second drying tower / third drying tower, and the refrigerant is evaporated into gaseous refrigerant. The gaseous refrigerant is increased in temperature and pressure through the compressor through the first waste heat recovery pipeline and then enters the deoxidation tower to provide heat for deoxidation in the deoxidation tower. The gaseous refrigerant is converted into liquid refrigerant after heat exchange in the deoxidation process. The liquid refrigerant enters the first drying tower / second drying tower / third drying tower through the second waste heat recovery pipeline through the throttle valve.

8. The energy consumption optimization method based on the hydrogen purification process according to claim 7, characterized in that: During the adsorption drying stage, the first pneumatic three-ball valve / the second pneumatic three-ball valve / the third pneumatic three-ball valve open the passage between the hydrogen delivery pipeline before cooling and the first pneumatic three-ball valve / the second pneumatic three-ball valve / the third pneumatic three-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, and 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, and the sixth waste heat recovery pipeline switching valve are closed; during the cooling During the cooling stage and the heating regeneration stage, the first pneumatic three-ball valve / the second pneumatic three-ball valve / the third pneumatic three-ball valve close the passage between the hydrogen delivery pipeline before cooling and the first pneumatic three-ball valve / the second pneumatic three-ball valve / the third pneumatic three-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, and 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, and the sixth waste heat recovery pipeline switching valve are opened.

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