System for recycling hydrogen purification treatment waste heat through heat exchanger

Abstract

The utility model relates to a system for recovering hydrogen purification treatment waste heat by a heat exchanger, which comprises the heat exchanger, a deaerator and a deoxidation cooler, a low-temperature side inlet of the hydrogen heat exchanger is connected with a pipeline entering a hydrogen purification system, a low-temperature side outlet of the hydrogen heat exchanger is connected with an inlet of the deaerator, and a high-temperature side inlet of the hydrogen heat exchanger is connected with an outlet of the deaerator. A high-temperature side outlet of the hydrogen heat exchanger is connected with the deoxidation cooler. According to the hydrogen purification treatment system, the heat exchanger preheats hydrogen to be fed into the deaerator and precools hydrogen to be fed into the deoxygenation cooler, so that the waste heat of the hydrogen purification treatment system is recycled, and the heat energy of the deaerator and the cold energy of the deoxygenation cooler are saved.

Description

Technical Field

[0001] The utility model relates to a system for recovering waste heat of hydrogen purification treatment by a heat exchanger, belonging to the technical field of heat energy recovery and utilization of hydrogen production by electrolysis. Background Art

[0002] The electrolysis water hydrogen production device generally includes an electrolysis hydrogen production unit, a post-processing separation unit, a post-processing purification unit, and a utility auxiliary unit. The post-processing system contains the most complex material and heat balance relationship of the entire hydrogen production system. It is an important process for separating the hydrogen, oxygen, and alkali produced by electrolysis, recycling the alkali for recycling, and purifying the hydrogen. However, the hydrogen purification system does not involve the recovery process and equipment for the heat energy in the hydrogen, resulting in a waste of hydrogen heat energy.

[0003] The utility model patent with publication number CN 218232600 U proposes a processing system for hydrogen production by electrolysis, wherein the heat exchanger and cooler are used to perform heat exchange treatment on the gas-liquid mixture output by the electrolysis device before output. The core of the system is to solve the problem of low system safety in the existing process flow, and the heat energy in the system is not recycled.

[0004] The invention patent application with publication number CN 117587458 A describes a cooling and heating module connected to the hydrogen-oxygen separation module, and the cooling and heating module is used to cool and recycle the heat of the alkali solution produced by the hydrogen-oxygen separation module. However, the invention patent application only considers the heat of the alkali solution being transferred to hot water for use, and does not consider the energy recovery in the hydrogen.

[0005] The utility model patent with publication number CN 212834047 U discloses a waste heat recovery system that utilizes the waste heat of the alkali solution after the electrolysis system to preheat the purified hydrogen in the deoxygenation system. The utility model patent only considers using the first hydrogen cooler and the second hydrogen cooler to cool the hydrogen to be treated and the hydrogen after deoxygenation treatment, but does not consider the recovery of heat energy from the hydrogen in the purification system.

[0006] Based on this, the utility model patent application proposes a waste heat recovery system that can recover the waste heat of the hydrogen purification treatment system in the hydrogen production device, realize energy-saving operation of the hydrogen purification system, and save energy at both ends before and after the deoxidizer. Utility Model Content

[0007] In order to solve the above problems, the utility model discloses a system for recovering waste heat from hydrogen purification treatment by a heat exchanger, and its specific technical solution is as follows:

[0008] A system for recovering waste heat from hydrogen purification treatment by a heat exchanger, comprising a hydrogen heat exchanger (1), a deoxidizer (2) and a deoxidizer cooler (3), wherein the low-temperature side inlet of the hydrogen heat exchanger (1) is connected to a hydrogen output pipeline of a hydrogen purification system, the low-temperature side outlet of the hydrogen heat exchanger (1) is connected to the inlet of the deoxidizer (2) via a pipeline, the high-temperature side inlet of the hydrogen heat exchanger (1) is connected to the outlet of the deoxidizer (2) via a pipeline, and the high-temperature side outlet of the hydrogen heat exchanger (1) is connected to the deoxidizer cooler (3) via a pipeline;

[0009] The hydrogen heat exchanger (1) preheats the hydrogen to be introduced into the deoxidizer (2) and precools the hydrogen to be introduced into the deoxidizer cooler (3).

[0010] Furthermore, there are one or more hydrogen heat exchangers (1). When there are two hydrogen heat exchangers (1), the hydrogen heat exchangers (1) are connected in series or in parallel. When there are three or more hydrogen heat exchangers (1), the hydrogen heat exchangers (1) are connected in series and / or in parallel.

[0011] Furthermore, the hydrogen heat exchanger (1) is a heat pipe heat exchanger, a plate heat exchanger or a shell and tube heat exchanger.

[0012] Furthermore, when there are two hydrogen heat exchangers (1), the hydrogen heat exchangers (1) adopt one or two of a heat pipe heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger; when there are three or more hydrogen heat exchangers (1), the hydrogen heat exchangers (1) adopt one, two, or three of a heat pipe heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger.

[0013] Furthermore, a deoxidation electric heater (4) is provided in the deoxidizer (2).

[0014] Furthermore, the deoxygenation cooler (3) is a water-cooled cooler, with water entering from the lower end and exiting from the upper end.

[0015] The working principle of the utility model is:

[0016] The existing alkaline electrolyzer electrolysis hydrogen production, the connection mode and working principle of the deoxidizer in the hydrogen purification system are as follows Figure 2 As shown. The low-temperature hydrogen entering the purification system is heated by the heater in the deoxidizer. The heated hydrogen and trace oxygen react chemically on the catalyst surface to generate water, which is then vaporized and carried out of the deoxidizer by the hot hydrogen. The water vapor passes through the deoxidizer cooler and is condensed and removed. The entire process of hydrogen heating, deoxidation, and hydrogen condensation and dehydration consumes a lot of energy.

[0017] The utility model uses a heat exchanger to preheat the hydrogen to be introduced into a deoxidizer, and precools the hydrogen to be introduced into a deoxidizer cooler.

[0018] The deoxidizer is a high-temperature reaction environment, and the oxygen in the hydrogen needs to be separated in a high-temperature environment. Therefore, preheating the hydrogen through a heat exchanger can reduce the energy consumption of heating the hydrogen in the deoxidizer.

[0019] The deaerator cooler plays a role of water cooling. The high-temperature hydrogen coming out of the deaerator is pre-cooled through the heat exchanger, and the heat energy recovery part of the high-temperature hydrogen can be retained in the heat exchanger to heat the hydrogen coming from the purification system.

[0020] The beneficial effects of the utility model are:

[0021] The utility model adds a hydrogen heat exchanger to the hydrogen post-processing purification system to recover the waste heat of the high-temperature hydrogen from the deoxidizer and reduce the temperature entering the deoxidizer cooler, thereby reducing the energy consumption of the hydrogen purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] List of reference numerals: 1 - heat exchanger, 2 - deaerator, 3 - deaerator cooler, 4 - deaerator electric heater.

[0024] Figure 2 is a schematic diagram of the existing system. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific implementations. It should be understood that the following specific implementations are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0026] Figure 1 and Figure 2 The deaerator cooler uses 7℃ cooling water for cooling. The actual inlet temperature of the deaerator cooler water is 7℃, which is the set 12℃.

[0027] Combined with Figure 1 It can be seen that the system for recovering waste heat of hydrogen purification by heat exchanger includes hydrogen heat exchanger 1, deoxidizer 2 and deoxidizer cooler 3. In order to more clearly show the device interface inside the system of the utility model, Figure 1 The positions of the equipment interfaces on the device are represented by letters, in order: low temperature side inlet a of hydrogen heat exchanger 1, low temperature side outlet b of hydrogen heat exchanger 1, inlet c of deoxidizer 2, high temperature side inlet e of hydrogen heat exchanger 1, outlet d of deoxidizer 2, high temperature side outlet f of hydrogen heat exchanger 1, hydrogen inlet g of deoxidizer cooler 3, hydrogen inlet and outlet h of deoxidizer cooler 3, cooling water inlet i of deoxidizer cooler 3, hydrogen cooling water inlet j of deoxidizer cooler 3.

[0028] The low temperature side inlet of the hydrogen heat exchanger 1 is connected to the hydrogen output pipeline of the hydrogen purification system, the low temperature side outlet of the hydrogen heat exchanger 1 is connected to the inlet of the deoxidizer 2 through a pipeline, the high temperature side inlet of the hydrogen heat exchanger 1 is connected to the outlet of the deoxidizer 2 through a pipeline, and the high temperature side outlet of the hydrogen heat exchanger 1 is connected to the deoxidizer cooler 3 through a pipeline. The hydrogen heat exchanger 1 preheats the hydrogen to be entered into the deoxidizer 2 and precools the hydrogen to be entered into the deoxidizer cooler 3. The high and low temperature hydrogen heat exchange is reversely convected inside the heat exchanger to realize the recovery and utilization of waste heat.

[0029] The following examples illustrate the number and connection relationship of the hydrogen heat exchangers 1 in the system. There are one or more than two hydrogen heat exchangers 1. When there are two hydrogen heat exchangers 1, the hydrogen heat exchangers 1 are connected in series or in parallel. When there are more than three hydrogen heat exchangers 1, the hydrogen heat exchangers 1 are connected in series and / or in parallel.

[0030] The hydrogen heat exchanger 1 is a heat pipe heat exchanger, a plate heat exchanger or a shell and tube heat exchanger.

[0031] When there are two hydrogen heat exchangers 1, the hydrogen heat exchanger 1 adopts one or two of a heat pipe heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger. When there are three or more hydrogen heat exchangers 1, the hydrogen heat exchanger 1 adopts one, two or three of a heat pipe heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger.

[0032] A deoxidation electric heater 4 is provided in the deoxidizer 2 .

[0033] The deaerator cooler 3 is a water-cooled cooler, with water entering from the lower end and exiting from the upper end.

[0034] The utility model discloses a system for recovering waste heat of hydrogen purification treatment by a heat exchanger, which is used for recovering waste heat of hydrogen purification treatment. The system includes a hydrogen heat exchanger, a deoxidizer, and a deoxidizer cooler, and the heat exchanger preheats the hydrogen entering the deoxidizer and precools the hydrogen entering the deoxidizer cooler.

[0035] Among them, the low-temperature side inlet of the hydrogen heat exchanger is connected to the pipeline of the hydrogen purification system, the low-temperature side outlet of the hydrogen heat exchanger is connected to the deoxidizer inlet, the high-temperature side inlet of the hydrogen heat exchanger is connected to the deoxidizer outlet, and the high-temperature side outlet of the hydrogen heat exchanger is connected to the deoxidizer cooler. The convection of high and low temperature hydrogen is used to preheat the low-temperature hydrogen entering the deoxidizer and precool the hydrogen entering the deoxidizer cooler.

[0036] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0037] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0038] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0039] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A system for recovering waste heat from hydrogen purification treatment by a heat exchanger, characterized in that: The invention comprises a hydrogen heat exchanger (1), a deoxidizer (2) and a deoxidizer cooler (3), wherein the low-temperature side inlet of the hydrogen heat exchanger (1) is connected to the hydrogen output pipeline of the hydrogen purification system, the low-temperature side outlet of the hydrogen heat exchanger (1) is connected to the inlet of the deoxidizer (2) via a pipeline, the high-temperature side inlet of the hydrogen heat exchanger (1) is connected to the outlet of the deoxidizer (2) via a pipeline, and the high-temperature side outlet of the hydrogen heat exchanger (1) is connected to the deoxidizer cooler (3) via a pipeline; The hydrogen heat exchanger (1) preheats the hydrogen to be introduced into the deoxidizer (2) and precools the hydrogen to be introduced into the deoxidizer cooler (3).

2. The system for recovering waste heat from hydrogen purification treatment by a heat exchanger according to claim 1, characterized in that: There are one or more hydrogen heat exchangers (1). When there are two hydrogen heat exchangers (1), the hydrogen heat exchangers (1) are connected in series or in parallel. When there are three or more hydrogen heat exchangers (1), the hydrogen heat exchangers (1) are connected in series and / or in parallel.

3. The system for recovering waste heat from hydrogen purification treatment by a heat exchanger according to claim 1, characterized in that: The hydrogen heat exchanger (1) is a heat pipe heat exchanger, a plate heat exchanger or a shell and tube heat exchanger.

4. The system for recovering waste heat from hydrogen purification treatment by a heat exchanger according to claim 2, characterized in that: When there are two hydrogen heat exchangers (1), the hydrogen heat exchangers (1) adopt one or two of a heat pipe heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger; when there are three or more hydrogen heat exchangers (1), the hydrogen heat exchangers (1) adopt one, two, or three of a heat pipe heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger.

5. The system for recovering waste heat from hydrogen purification treatment by a heat exchanger according to claim 1, characterized in that: A deoxidation electric heater (4) is arranged in the deoxidizer (2).

6. The system for recovering waste heat from hydrogen purification treatment by a heat exchanger according to claim 1, characterized in that: The deoxygenation cooler (3) is a water-cooled cooler, with water entering from the lower end and exiting from the upper end.

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