Hydrogen recycling and purifying system for hydrogen decrepitation furnace

Abstract

The utility model discloses a hydrogen recycling and purifying system for a hydrogen decrepitation furnace. The recycling and purifying system comprises a purifying unit and a purifying unit, wherein the purification unit comprises a hydrogen recovery header pipe, the first end of the hydrogen recovery header pipe is connected with the discharge end of the hydrogen decrepitation furnace, and the second end of the hydrogen recovery header pipe is connected to the purification unit; the oxygen-in-hydrogen sensor is used for detecting gas in the hydrogen recovery header pipe, and the receiving end and the discharging end of the oxygen-in-hydrogen sensor communicate with the hydrogen recovery header pipe through the first detection pipeline and the second detection pipeline correspondingly; the second valve is mounted on the hydrogen recovery header pipe, and the second valve is electrically connected with the oxygen-in-hydrogen sensor; and after the oxygen-in-hydrogen sensor detects that the oxygen content in the gas reaches a threshold value, the hydrogen recovery header pipe is closed through the second valve.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen crushing technology, and in particular to a hydrogen recycling and purification system for a hydrogen crushing furnace. Background Technology

[0002] The application of hydrogen-based crushing technology in the preparation of inorganic materials has grown significantly in recent years, especially in industries requiring efficient and environmentally friendly crushing. Compared to traditional mechanical crushing (with an efficiency of approximately 10%), hydrogen crushing can significantly reduce dust pollution and energy consumption. A typical application of hydrogen crushing technology is in the preparation of neodymium iron boron magnets. By exposing the alloy ingot to hydrogen in a hydrogen atmosphere, it expands, inducing grain boundary fracture and forming uniform single-crystal powder. Hydrogen crushing technology can control the oxygen content at a low level (below approximately 200 ppm), improving the performance consistency of sintered magnets.

[0003] Hydrogen crushing technology includes hydrogen absorption, crushing, dehydrogenation, and cooling stages. Currently, in practical applications in factories, the hydrogen-rich exhaust gas generated during the dehydrogenation stage is almost always directly emitted into the atmosphere, resulting in a significant waste of hydrogen resources. The main reasons are as follows: First, hydrogen recovery has high safety requirements; the explosive limits of hydrogen are 4.0% to 75.6% (volume concentration), making the safety design of the hydrogen recovery system crucial. Second, in addition to hydrogen, the hydrogen-rich exhaust gas also contains argon, dust, oil mist, and other substances, requiring complex processes such as dust removal, oil removal, deoxygenation, and dehydration for recovery.

[0004] Hydrogen recovery, separation, and purification technologies mainly include pressure swing adsorption (PSA), membrane separation, cryogenic separation, and metal hydride separation. PSA technology has low yield, large footprint, and high investment, making it suitable for large-scale hydrogen production scenarios. Membrane separation technology is not only costly, but the membrane materials are also easily contaminated, requiring frequent cleaning. Cryogenic separation technology requires refrigerants or liquid nitrogen, resulting in large equipment investment and complex maintenance. Metal hydrides are specifically used for ultrapure hydrogen applications where cost sensitivity is low. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems by providing a hydrogen recycling and purification system for a hydrogen crushing furnace.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a hydrogen recycling and purification system for a hydrogen crushing furnace, the recycling and purification system including a purification unit and a purification unit;

[0008] The purification unit includes:

[0009] The hydrogen recovery main pipe has its first end connected to the discharge end of the hydrogen crushing furnace and its second end connected to the purification unit.

[0010] The hydrogen oxygen sensor is used to detect the gas in the hydrogen recovery main pipe. The receiving end and the emission end of the hydrogen oxygen sensor are connected to the hydrogen recovery main pipe through the first detection pipe and the second detection pipe, respectively.

[0011] The second valve is installed on the hydrogen recovery main pipe and is electrically connected to the oxygen sensor in hydrogen.

[0012] After the oxygen sensor detects that the oxygen content in the gas has reached a threshold, it closes the hydrogen recovery main pipe through the second valve.

[0013] The purification unit includes:

[0014] A primary buffer tank, the input of which is connected to the purification unit;

[0015] The secondary buffer tank has its inlet connected to the outlet of the primary buffer tank via an electrochemical hydrogen pump.

[0016] The recovery and purification system further includes:

[0017] A hydrogen supply unit is connected to the discharge end of the secondary buffer tank. The hydrogen supply unit is used to collect the final recovered gas from the secondary buffer tank and to provide the final recovered gas to the receiving end of the hydrogen crushing furnace.

[0018] The advantages or beneficial effects of the above technical solutions include at least the following:

[0019] This hydrogen recycling and purification system for a hydrogen crushing furnace allows for the recycling of hydrogen during the hydrogen crushing process. First, the hydrogen-rich tail gas undergoes dust and oil removal, followed by deoxygenation. Then, an electrochemical hydrogen pump purifies and compresses the hydrogen before it is finally returned to the hydrogen crushing furnace for reuse. This invention / utility model patent adds an oxygen removal system, a hydrogen oxygen sensor, and a control valve to the system, addressing the issue of low safety in hydrogen recovery. The electrochemical hydrogen pump used in this invention / utility model patent not only directly produces ultrapure hydrogen, adapting to low-concentration gas sources, but also exhibits excellent impurity resistance and significant economic benefits, solving the problems of high difficulty and cost in purifying hydrogen-rich tail gas. Attached Figure Description

[0020] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0021] Figure 1A schematic diagram of the structural layout of an embodiment of the present invention is shown;

[0022] Reference numerals: 10. Hydrogen crushing furnace; 20. Purification unit; 21. Hydrogen recovery main pipe; 22. Hydrogen oxygen sensor; 221. First detection pipeline; 222. Second detection pipeline; 23. Mechanical pump; 24. Oil and dust removal equipment; 25. Nitrogen purger; 26. Deoxygenation equipment; 201. First valve; 202. Second valve; 203. Third valve; 204. Fourth valve; 205. Fifth valve; 30. Purification unit; 31. Primary buffer tank; 32. Secondary buffer tank; 34. Electrochemical hydrogen pump; 40. Hydrogen supply unit; 41. Compressor; 411. First pressure reducing valve; 42. High-pressure hydrogen storage tank; 421. Second pressure reducing valve; 43. Hydrogen supply pipeline. Detailed Implementation

[0023] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0026] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] The names of the messages or information exchanged between the multiple devices in this embodiment of the invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0028] Reference Figure 1 A hydrogen recycling and purification system for a hydrogen crushing furnace, the recycling and purification system includes a purification unit 20, a purification unit 30 and a hydrogen supply unit 40;

[0029] The purification unit 20 is connected to the discharge end of the hydrogen crushing furnace 10, and is used to collect the first waste gas discharged from the hydrogen crushing furnace 10 and process it into a second waste gas through a first treatment. The purification unit 30 is connected to the discharge end of the purification unit 20, and is used to collect the second waste gas formed by the purification unit 20 and process it into a final recovered gas through a second treatment. The receiving end of the hydrogen supply unit 40 is connected to the discharge end of the purification unit 30, and is used to collect the final recovered gas formed by the purification unit 30. The discharge end of the hydrogen supply unit is connected to the receiving end of the hydrogen crushing furnace 10. The purification unit 20 treats the waste gas generated by the hydrogen crushing furnace 10 to remove oil and dust, and then performs deoxygenation treatment to obtain the second waste gas. The purification unit 30 sieves the hydrogen in the second waste gas to obtain high-purity hydrogen gas, which is then returned to the hydrogen crushing furnace 10 through the hydrogen supply unit 40 to achieve circulation. Figure 1 As shown, the details are as follows:

[0030] The purification unit 20 of the hydrogen recycling and purification system includes:

[0031] The hydrogen recovery main pipe 21 has its first end connected to the discharge end of the hydrogen crushing furnace 10. The exhaust gas from the hydrogen crushing furnace will be directly discharged into the hydrogen recovery main pipe 21. The second end of the hydrogen recovery main pipe 21 is connected to the purification unit 30. A first valve 201 is also installed on the hydrogen recovery main pipe 21 to close the connection between the hydrogen crushing furnace and the purification unit 20.

[0032] The hydrogen oxygen sensor 22 is used to detect the gas in the hydrogen recovery main pipe 21. The receiving end and the emission end of the hydrogen oxygen sensor 22 are connected to the hydrogen recovery main pipe 21 through the first detection pipe 221 and the second detection pipe 222, respectively. A portion of the exhaust gas in the hydrogen recovery main pipe 21 will enter the first detection pipe 221, pass through the hydrogen oxygen sensor 22, and then return to the hydrogen recovery main pipe 21 through the second detection pipe 222, thereby realizing the circulation of the detected gas and ensuring the accuracy of detection.

[0033] The second valve 202 is installed on the hydrogen recovery main pipe 21 and is electrically connected to the hydrogen oxygen sensor 22. When the hydrogen oxygen sensor 22 detects that the oxygen content in the gas has reached the threshold, it closes the hydrogen recovery main pipe 21 through the second valve 202. If the hydrogen contains a certain amount of oxygen, it will cause an explosion. The hydrogen oxygen sensor 22 can close the hydrogen recovery main pipe 21 through the second valve 202 before a dangerous situation occurs.

[0034] Furthermore, a third valve 203 is installed on the first detection line 221, and a fourth valve 204 is installed on the second detection line 222. Both the third valve 203 and the fourth valve 204 are electrically connected to the hydrogen oxygen sensor 22. When the hydrogen oxygen sensor 22 detects that the oxygen content in the gas has reached the threshold, it will also close the third valve 203 and the fourth valve 204, further improving safety.

[0035] The purification unit 20 further includes:

[0036] Mechanical pump 23 is used to pump the gas in the hydrogen recovery main pipe 21 from the purification unit 20 to the purification unit 30. The second valve 202 is installed between mechanical pump 23 and the second detection pipeline 222. Mechanical pump 23 is used to make the gas flow in the entire recovery and purification system. When the second valve 202 is closed, mechanical pump 23 cannot draw gas, so that the entire purification system stops operating and avoids danger.

[0037] The purification unit 20 further includes:

[0038] Oil and dust removal equipment 24 is installed on hydrogen recovery main pipe 21 and is used to remove dust and oil stains from the gas inside hydrogen recovery main pipe 21.

[0039] Nitrogen purger 25 is connected to oil and dust removal equipment 24;

[0040] When the oxygen sensor 22 detects that the oxygen content in the gas has reached the threshold, the nitrogen purger 25 is activated, blowing high-pressure nitrogen into the oil and dust removal equipment 24. The high-pressure nitrogen enters the hydrogen recovery manifold 21 through the oil and dust removal equipment 24 and is then blown into the primary buffer tank for discharge. The high-pressure nitrogen will first be blown into the oil and dust removal equipment 24 to clean the dust and oil removal equipment, and the impurities will be discharged through the hydrogen recovery manifold 21.

[0041] The purification unit 20 further includes:

[0042] The deoxygenation device 26 is installed on the hydrogen recovery main pipe 21, located between the oil and dust removal device 24 and the first detection pipeline 221, and is used to remove oxygen from the hydrogen recovery main pipe 21.

[0043] The hydrogen recycling and purification system purification unit 30 includes:

[0044] The primary buffer tank 31 has its input end connected to the purification unit 20;

[0045] The secondary buffer tank 32 has its input end connected to the discharge end of the primary buffer tank via an electrochemical hydrogen pump 34. The electrochemical hydrogen pump 34 selectively conducts protons through a proton exchange membrane (PEM), directly outputting ultrapure hydrogen with a purity of over 99.999% and a pressure of 1.6 MPa. It can sieve hydrogen atoms from the gas in the primary buffer tank 31 and input them into the secondary buffer tank 32, so that the secondary buffer tank 32 has hydrogen with higher purity and higher pressure than the primary buffer tank 31. Then, after being depressurized by the pressure reducing valve 411, it is directly input into the hydrogen crushing furnace 10 for recovery.

[0046] The hydrogen supply unit 40 of the hydrogen recycling and purification system includes:

[0047] The hydrogen supply pipeline 43 has 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.

[0048] The compressor 41 has one end connected to the discharge end of the secondary buffer tank 32 and the other end connected to the high-pressure hydrogen storage tank 42.

[0049] The high-pressure hydrogen storage tank 42 is connected at one end to the compressor 41 and at the other end to the hydrogen supply line 43. The high-pressure hydrogen storage tank 42 has an external hydrogen input source for inputting hydrogen into the high-pressure hydrogen storage tank 42. The high-pressure hydrogen storage tank 42 can store hydrogen. The compressor 41 will pump hydrogen into the high-pressure hydrogen storage tank 42 for storage.

[0050] The hydrogen supply unit 40 further includes:

[0051] The first pressure reducing valve 411 is installed on the hydrogen supply pipeline 43, between the secondary buffer tank 32 and the hydrogen crushing furnace 10, and is used to reduce the pressure of the hydrogen in the secondary buffer tank 32 to a predetermined range for supply to the hydrogen crushing furnace 10.

[0052] The second pressure reducing valve 421 is installed between the high-pressure hydrogen storage tank 42 and the hydrogen crushing furnace 10, and is used to reduce the pressure of hydrogen in the high-pressure hydrogen storage tank 42 to a predetermined range for supply to the hydrogen crushing furnace 10.

[0053] The hydrogen supply unit 40 can supply hydrogen from the secondary buffer tank 32 to the hydrogen crusher 10 through the hydrogen supply pipeline 43 and the first pressure reducing valve 411; or it can pump the hydrogen from the secondary buffer tank 32 to the high-pressure hydrogen storage tank 42 for temporary storage through the compressor 41, and then supply the hydrogen to the hydrogen crusher 10 after the pressure is reduced by the second pressure reducing valve 421.

[0054] During the recycling process, when the hydrogen crusher 10 is short of hydrogen, the hydrogen supply unit 40 can supplement hydrogen through an external hydrogen input source through the high-pressure hydrogen storage tank 42.

[0055] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A hydrogen recycling and purification system for a hydrogen crushing furnace, characterized in that: The recovery and purification system includes a purification unit (20) and a purification unit (30). The purification unit (20) includes: The hydrogen recovery main pipe (21) has its first end connected to the discharge end of the hydrogen crushing furnace (10) and its second end connected to the purification unit (30). The hydrogen oxygen sensor (22) is used to detect the gas in the hydrogen recovery main pipe (21). The receiving end and the emission end of the hydrogen oxygen sensor (22) are connected to the hydrogen recovery main pipe (21) through the first detection pipe (221) and the second detection pipe (222), respectively. The second valve (202) is installed on the hydrogen recovery main pipe (21) and is electrically connected to the hydrogen oxygen sensor (22); After the oxygen sensor (22) detects that the oxygen content in the gas has reached the threshold, it closes the hydrogen recovery main pipe (21) through the second valve (202). The purification unit (30) includes: A primary buffer tank (31) is connected at its input end to the purification unit (20); The secondary buffer tank (32) has its input end connected to the discharge end of the primary buffer tank (31) via an electrochemical hydrogen pump (34); The recovery and purification system further includes: The hydrogen supply unit (40) is connected to the discharge end of the secondary buffer tank (32). The hydrogen supply unit (40) is used to collect the final recovered gas from the secondary buffer tank (32) and to provide the final recovered gas to the receiving end of the hydrogen crusher (10).

2. The hydrogen recycling and purification system for a hydrogen crushing furnace according to claim 1, characterized in that: The purification unit (20) further includes: A mechanical pump (23) is used to pump the gas in the hydrogen recovery manifold (21) from the purification unit (20) to the purification unit (30), and the second valve (202) is installed between the mechanical pump (23) and the second detection line (222).

3. The hydrogen recycling and purification system for a hydrogen crushing furnace according to claim 2, characterized in that: The purification unit (20) further includes: Oil and dust removal equipment (24) is installed on the hydrogen recovery main pipe (21) and is used to remove dust and oil stains from the gas in the hydrogen recovery main pipe (21); A nitrogen purger (25) is connected to the oil and dust removal equipment (24); After the oxygen sensor (22) detects that the oxygen content in the gas has reached the threshold, the nitrogen purger (25) is activated and high-pressure nitrogen is blown into the oil and dust removal equipment (24). The high-pressure nitrogen enters the hydrogen recovery manifold (21) through the oil and dust removal equipment (24) and is then blown into the primary buffer tank for discharge.

4. The hydrogen recycling and purification system for a hydrogen crushing furnace according to claim 3, characterized in that: The purification unit (20) further includes: The deoxygenation device (26) is installed on the hydrogen recovery main pipe (21) and located between the oil and dust removal device (24) and the first detection pipeline (221) to remove oxygen from the hydrogen recovery main pipe (21).

5. The hydrogen recycling and purification system for a hydrogen crushing furnace according to any one of claims 1-4, characterized in that: The hydrogen supply unit (40) includes: The hydrogen supply pipeline (43) has 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). The compressor (41) has one end connected to the discharge end of the secondary buffer tank (32) and the other end connected to the high-pressure hydrogen storage tank (42); A high-pressure hydrogen storage tank (42) is connected at one end to the compressor (41) and at the other end to the hydrogen supply pipeline (43). The high-pressure hydrogen storage tank (42) has a hydrogen input source for inputting hydrogen into the high-pressure hydrogen storage tank (42).

6. The hydrogen recycling and purification system for a hydrogen crusher according to claim 5, characterized in that: The hydrogen supply unit (40) further includes: The first pressure reducing valve (411) is installed between the secondary buffer tank (32) and the hydrogen crushing furnace (10) to reduce the pressure of hydrogen in the secondary buffer tank (32) to a predetermined range for use by the hydrogen crushing furnace (10); The second pressure reducing valve (421) is installed between the high-pressure hydrogen storage tank (42) and the hydrogen crushing furnace (10) to reduce the pressure of hydrogen in the high-pressure hydrogen storage tank (42) to a predetermined range for use by the hydrogen crushing furnace (10).

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