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CN-122010051-A - Pulse ammonia removal method

CN122010051ACN 122010051 ACN122010051 ACN 122010051ACN-122010051-A

Abstract

The invention provides a pulse ammonia removal method which is suitable for a hydrogen purifier, wherein a membrane electrode is arranged in the hydrogen purifier and comprises a catalytic layer and a proton exchange membrane, the membrane electrode is used for removing ammonia on the catalytic layer and the proton exchange membrane, the ammonia removal method comprises the steps of introducing mixed gas with a set proportion to an anode of the hydrogen purifier under a set condition, introducing hydrogen to a cathode of the hydrogen purifier, introducing pulse voltage to the hydrogen purifier for a plurality of times through a pulse power supply so as to enable ammonia attached to the catalytic layer and the proton exchange membrane to perform oxidation reaction, and separating the ammonia from the catalytic layer and the proton exchange membrane, wherein the mixed gas comprises hydrogen and ammonia, the set condition is that the hydrogen purifier is at a set temperature, the value range of the ratio of the hydrogen to the ammonia is (99-99.9) (1-0.1), and the problems of catalyst poisoning and performance attenuation caused by ammonia residues of an electrochemical hydrogen purifier in the prior art are solved.

Inventors

  • PAN XIANKAI
  • CHANG LEI
  • YU XIUQIN
  • XU JINYANG
  • GAO YUXUAN
  • XI YETING
  • ZHOU YIRUI
  • TANG HAOLIN
  • LU HUAXING
  • GANG ZHI

Assignees

  • 佛山绿动氢能科技有限公司
  • 国家电投集团氢能科技发展有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The pulse ammonia removal method is suitable for a hydrogen purifier, wherein a membrane electrode is arranged in the hydrogen purifier, the membrane electrode comprises a catalytic layer and a proton exchange membrane, the pulse ammonia removal method is used for removing ammonia on the catalytic layer and the proton exchange membrane, and the ammonia removal method comprises the following steps: Introducing mixed gas with a set proportion into the anode of the hydrogen purifier under the set condition of the hydrogen purifier, and introducing hydrogen into the cathode of the hydrogen purifier; Introducing pulse voltage to the hydrogen purifier through a pulse power supply so as to enable the ammonia attached to the catalytic layer and the proton exchange membrane to undergo oxidation reaction, so that the ammonia is separated from the catalytic layer and the proton exchange membrane; The mixed gas comprises hydrogen and ammonia, the set condition is that the hydrogen purifier is at a set temperature, and the set proportion is that the value range of the ratio of the hydrogen to the ammonia is (99-99.9) (1-0.1).
  2. 2. The pulse ammonia removal method of claim 1, wherein the step of applying a pulse voltage to the hydrogen purifier via a pulse power supply is preceded by the step of: Introducing a waiting voltage into the hydrogen purifier; Accumulating the waiting time of the waiting voltage; And when the waiting time is the first time, introducing the pulse voltage to the hydrogen purifier.
  3. 3. The pulse ammonia removal method of claim 2, wherein the step of supplying the pulse voltage to the hydrogen purifier further comprises: Accumulating pulse duration after the pulse voltage is introduced; And when the pulse duration is the second duration, continuing to introduce the waiting voltage into the hydrogen purifier, and repeatedly executing the step of accumulating the waiting duration of the waiting voltage until the introduction of the mixed gas into the hydrogen purifier is stopped.
  4. 4. The pulse ammonia removal method of claim 1, wherein a flow rate of the mixed gas applied to the hydrogen purifier is between 36.26L/min and 37.74L/min.
  5. 5. The pulse ammonia removal method of claim 1, wherein the flow rate of hydrogen gas introduced into the cathode of the hydrogen purifier is between 36.26L/min and 37.74L/min.
  6. 6. The pulse ammonia removal method of claim 2, wherein the standby voltage is between 2.47v and 2.53 v.
  7. 7. The pulse ammonia removal method according to claim 2, wherein the waiting time period is between 59.4s and 60.6 s.
  8. 8. The pulse ammonia removal method according to claim 3, wherein the pulse voltage is between 17.32v and 17.67 v.
  9. 9. The pulse ammonia removal method of claim 3, wherein the pulse duration is between 14.85s and 15.15 s.
  10. 10. The pulse ammonia removal method of claim 1, wherein the set temperature is between 79.2 ℃ and 80.8 ℃.

Description

Pulse ammonia removal method Technical Field The application relates to the technical field of ammonia removal, in particular to a pulse ammonia removal method. Background Hydrogen energy has an important role in reducing fossil energy dependence and guaranteeing national energy safety, but the storage and transportation of hydrogen is always one of the key challenges of hydrogen energy application. Ammonia is used as a high-efficiency hydrogen storage medium, transported in the form of liquid ammonia, and then pyrolyzed to generate hydrogen, thereby providing a feasible path for hydrogen storage and transportation. The electrochemical hydrogen purifying technology utilizes a structure similar to that of a proton exchange membrane fuel cell, hydrogen is oxidized into protons at an anode through electrochemical reaction, and the protons are transported to a cathode through a membrane to be recombined into hydrogen molecules, so that the separation and purification of hydrogen are realized. However, ammonia impurities that are not fully reacted during the ammonia pyrolysis process can produce serious ammonia poisoning effects on the catalyst and proton exchange membrane of the electrochemical hydrogen purifier, severely affecting the separation efficiency and durability of the device. Conventional solutions, such as disassembly and replacement of critical components, are not only complex and costly, limiting the commercial application of electrochemical purification techniques. Disclosure of Invention The invention mainly aims to provide a pulse ammonia removal method to solve the problems of membrane electrode poisoning and performance degradation caused by ammonia residues of an electrochemical hydrogen purifier in the prior art. In order to achieve the above object, according to one aspect of the present invention, there is provided a pulse ammonia removal method, which is applied to a hydrogen purifier in which a membrane electrode including a catalytic layer and a proton exchange membrane is provided, for removing ammonia on the catalytic layer and the proton exchange membrane, the ammonia removal method comprising: introducing mixed gas with a set proportion to the anode of the hydrogen purifier under the set condition of the hydrogen purifier, and introducing hydrogen to the cathode of the hydrogen purifier; pulse voltage is introduced into the hydrogen purifier through a pulse power supply so as to enable ammonia attached to the catalytic layer and the proton exchange membrane to undergo oxidation reaction, and the ammonia is separated from the catalytic layer and the proton exchange membrane; The mixed gas comprises hydrogen and ammonia, the set condition is that the hydrogen purifier is at the set temperature, and the set ratio is that the value range of the ratio of the hydrogen to the ammonia is (99-99.9): 1-0.1. Further, before the step of supplying the pulse voltage to the hydrogen purifier by the pulse power supply, the method comprises: introducing a waiting voltage into the hydrogen purifier; Accumulating the waiting time of the waiting voltage; and when the waiting time is the first time, introducing pulse voltage to the hydrogen purifier. Further, the step of supplying the pulse voltage to the hydrogen purifier further comprises: accumulating pulse duration after the pulse voltage is introduced; And when the pulse duration is the second duration, continuing to introduce the waiting voltage into the hydrogen purifier, and repeatedly executing the step of accumulating the waiting duration of the waiting voltage until the introduction of the mixed gas into the hydrogen purifier is stopped. Further, the flow rate of the mixed gas applied to the hydrogen purifier is between 36.26L/min and 37.74L/min. Further, the flow of the hydrogen gas introduced into the cathode of the hydrogen purifier is between 36.26L/min and 37.74L/min. Further, the standby voltage is 2.47V-2.53V. Further, the waiting time is 59.4 s-60.6 s. Further, the pulse voltage is 17.32V-17.67V. Further, the pulse duration is between 14.85s and 15.15 s. Further, the set temperature is between 79.2 ℃ and 80.8 ℃. By applying the technical scheme of the invention, the periodic pulse voltage is implemented on the electrochemical hydrogen purifier, so that the effective removal of ammonia adsorbed on the catalytic layer and the proton exchange membrane is realized, and the performance and the service life of the hydrogen purifier are remarkably improved. Conventional hydrogen purifiers are extremely sensitive to ammonia, and even a small amount of ammonia can cause catalyst poisoning, severely affecting purification efficiency. After the pulse ammonia removal technology is adopted, the purifier can tolerate ammonia with higher concentration, so that stable operation in an ammonia-containing tail gas environment generated by ammonia pyrolysis is ensured, and the reliability and flexibility of the whole system are improved. The periodic pu