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CN-224212406-U - Hydrogen recycling and purifying system for hydrogen crushing furnace

CN224212406UCN 224212406 UCN224212406 UCN 224212406UCN-224212406-U

Abstract

The utility model discloses a hydrogen recycling, recovering and purifying system for a hydrogen crushing furnace, which comprises a purifying unit and a purifying unit, wherein the purifying unit comprises a hydrogen recycling main pipe, a hydrogen-in-oxygen sensor and a second valve, the first end of the hydrogen recycling main pipe is connected with the discharging end of the hydrogen crushing furnace, the second end of the hydrogen recycling main pipe is connected to the purifying unit, the hydrogen-in-oxygen sensor is used for detecting gas in the hydrogen recycling main pipe, the receiving end and the discharging end of the hydrogen-in-oxygen sensor are respectively communicated with the hydrogen recycling main pipe through a first detection pipeline and a second detection pipeline, the second valve is arranged on the hydrogen recycling main pipe and is electrically connected with the hydrogen-in-oxygen sensor, and the hydrogen recycling main pipe is closed through the second valve after the hydrogen-in-oxygen sensor detects that the oxygen content in the gas reaches a threshold value.

Inventors

  • LI SHUIRONG
  • ZHANG WEIQIANG
  • LIN SHANSHAN
  • FANG JIANXIN
  • XIE DONGQUAN
  • FANG XIAOLIANG

Assignees

  • 嘉庚创新实验室

Dates

Publication Date
20260508
Application Date
20250516

Claims (6)

  1. 1. A hydrogen recycling and purifying system for a hydrogen crushing furnace is characterized by comprising a purifying unit (20) and a purifying unit (30); wherein the purification unit (20) comprises: A hydrogen recovery header pipe (21) having a first end connected to a discharge end of the hydrogen crushing furnace (10) and a second end connected to a purification unit (30); The hydrogen-in-oxygen sensor (22) is used for detecting gas in the hydrogen recovery main pipe (21), and a receiving end and a discharging end of the hydrogen-in-oxygen sensor (22) are respectively communicated with the hydrogen recovery main pipe (21) through a first detection pipeline (221) and a second detection pipeline (222); A second valve (202) mounted on the hydrogen recovery header (21), the second valve (202) being electrically connected to the in-hydrogen oxygen sensor (22); The hydrogen recovery main pipe (21) is closed through the second valve (202) after the oxygen-in-hydrogen sensor (22) detects that the oxygen content in the gas reaches a threshold value; Wherein the purification unit (30) comprises: A first-stage buffer tank (31) having an input end connected to the purification unit (20); The input end of the secondary buffer tank (32) is connected with the discharge end of the primary buffer tank (31) through an electrochemical hydrogen pump (34); The recovery purification system further comprises: And the hydrogen supply unit (40) is connected with the discharge end of the secondary buffer tank (32), and the hydrogen supply unit (40) is used for collecting the final recovered gas of the secondary buffer tank (32) and providing the final recovered gas for the receiving end of the hydrogen crushing furnace (10).
  2. 2. The hydrogen recycling and purifying system for a hydrogen crushing furnace according to claim 1, wherein the purifying unit (20) further comprises: -a mechanical pump (23) for pumping the gas inside the hydrogen recovery header (21) from the purification unit (20) to the purification unit (30), the second valve (202) being mounted between the mechanical pump (23) and the second detection line (222).
  3. 3. The hydrogen recycling and purifying system for a hydrogen crushing furnace according to claim 2, wherein the purifying unit (20) further comprises: The oil and dust removing equipment (24) is arranged on the hydrogen recovery main pipe (21) and is used for removing dust and oil stains of gas in the hydrogen recovery main pipe (21); A nitrogen blower (25) in communication with the oil and dust removal device (24); After the oxygen sensor (22) detects that the oxygen content in the gas reaches a threshold value, the nitrogen purging device (25) is started, high-pressure nitrogen is blown into the oil and dust removing equipment (24), the high-pressure nitrogen enters the hydrogen recovery main pipe (21) through the oil and dust removing equipment (24), and the high-pressure nitrogen is blown into the primary buffer tank through the hydrogen recovery main pipe (21) to be discharged.
  4. 4. The hydrogen recycling and purifying system for a hydrogen crushing furnace according to claim 3, wherein the purifying unit (20) further comprises: The deoxygenation device (26) is arranged on the hydrogen recovery main pipe (21), is located between the oil removal and dust removal device (24) and the first detection pipeline (221), and is used for removing oxygen in the hydrogen recovery main pipe (21).
  5. 5. The hydrogen recycling purification system for a hydrogen crushing furnace according to any one of claims 1 to 4, wherein the hydrogen supply unit (40) comprises: A hydrogen supply pipe (43) having one end connected to the discharge end of the secondary buffer tank (32) and the other end connected to the receiving end of the hydrogen crushing furnace (10); A compressor (41) having one end connected to the discharge end of the secondary buffer tank (32) and the other end connected to a high-pressure hydrogen storage tank (42); And a high-pressure hydrogen storage tank (42) with one end connected with the compressor (41) and the other end connected with a hydrogen supply pipeline (43), wherein the high-pressure hydrogen storage tank (42) is provided with a hydrogen input source for inputting hydrogen into the high-pressure hydrogen storage tank (42).
  6. 6. The hydrogen recycling purification system for a hydrogen crushing furnace according to claim 5, wherein the hydrogen supply unit (40) further comprises: a first pressure reducing valve (411) installed between the secondary buffer tank (32) and the hydrogen crushing furnace (10) for reducing the pressure of the hydrogen gas in the secondary buffer tank (32) to a predetermined range for use in the hydrogen crushing furnace (10); A second pressure reducing valve (421) is installed between the high-pressure hydrogen storage tank (42) and the hydrogen crushing furnace (10) for reducing the pressure of the hydrogen in the high-pressure hydrogen storage tank (42) to a predetermined range for the hydrogen crushing furnace (10).

Description

Hydrogen recycling and purifying system for hydrogen crushing furnace Technical Field The utility model relates to the technical field of hydrogen crushing, in particular to a hydrogen recycling and purifying system for a hydrogen crushing furnace. Background The application of hydrogen crushing technology in the preparation of inorganic materials has increased significantly in recent years, and particularly plays an important role in industries requiring efficient and environment-friendly crushing. Compared with the traditional mechanical crushing (the efficiency is about 10%), the hydrogen crushing can remarkably reduce dust pollution and energy consumption. A typical application of the hydrogen crushing technique is to prepare a neodymium iron boron magnet by hydrogen-absorbing expansion of an alloy ingot in a hydrogen atmosphere to induce grain boundary fracture, thereby forming a uniform single crystal powder. The hydrogen crushing technology can control the oxygen content to be lower (about 200 ppm or less) so as to improve the performance consistency of the sintered magnet. The hydrogen crushing technology comprises a hydrogen absorption stage, a crushing stage, a dehydrogenation stage and a cooling stage. Currently, in practical application of a factory, hydrogen-rich tail gas generated in a dehydrogenation stage is basically and directly discharged into the atmosphere, so that great waste of hydrogen materials is caused. The first one is that the safety requirement of hydrogen recovery is high, the explosion limit of hydrogen is 4.0-75.6% (volume concentration), the safety design of a hydrogen recovery system is important, and the second one is that the hydrogen-rich tail gas contains substances such as argon, dust, oil mist and the like besides hydrogen, and the hydrogen-rich tail gas needs to be subjected to dust removal, oil removal, deoxidation, dehydration and other treatment processes when being recovered, so that the process is complex. The hydrogen recovery separation and purification technology mainly comprises a Pressure Swing Adsorption (PSA) technology, a membrane separation technology, a low-temperature separation technology and a metal hydride separation technology. The PSA technology has low yield, large occupied area and large investment, is suitable for a large-scale hydrogen production scene, has high cost, is easy to pollute membrane materials and needs frequent cleaning, the low-temperature separation technology needs refrigerant or liquid nitrogen, has large equipment investment and complex maintenance, and is special for the fields of ultra-pure hydrogen and low cost sensitivity. Disclosure of utility model The utility model aims to solve the problems and provide a hydrogen recycling and purifying system for a hydrogen crushing furnace. The technical scheme of the utility model is realized as follows: The utility model provides a hydrogen recycling and purifying system for a hydrogen crushing furnace, which comprises a purifying unit and a purifying unit; Wherein, the purification unit includes: A hydrogen recovery header pipe, a first end of which is connected with the discharge end of the hydrogen crushing furnace, and a second end of which is connected to a purification unit; The hydrogen-in-oxygen sensor is used for detecting gas in the hydrogen recovery main pipe, and a receiving end and a discharging end of the hydrogen-in-oxygen sensor are respectively communicated with the hydrogen recovery main pipe through the first detection pipeline and the second detection pipeline; The second valve is arranged on the hydrogen recovery main pipe and is electrically connected with the hydrogen-in-oxygen sensor; After the oxygen content in the gas detected by the oxygen-in-hydrogen sensor reaches a threshold value, closing the hydrogen recovery main pipe through the second valve; wherein the purification unit comprises: the input end of the first-stage buffer tank is connected with the purification unit; The input end of the secondary buffer tank is connected with the discharge end of the primary buffer tank through an electrochemical hydrogen pump; The recovery purification system further comprises: And the hydrogen supply unit is connected with the discharge end of the secondary buffer tank and is used for collecting the final recovered gas of the secondary buffer tank and providing the final recovered gas for the receiving end of the hydrogen crushing furnace. The advantages or beneficial effects in the technical scheme at least comprise: The hydrogen recycling and purifying system for the hydrogen crushing furnace can recycle hydrogen in the hydrogen crushing technology. Firstly, carrying out dust removal and oil removal treatment on hydrogen-rich tail gas, then carrying out deoxidization treatment, purifying and compressing hydrogen by using an electrochemical hydrogen pump, and finally conveying the hydrogen to a hydrogen crushing furnace for recycling. The utility model/utili