Rare earth metal powder explosion-proof dust collecting device

Abstract

The utility model relates to rare earth hydrogen storage alloy or quick -setting neodymium iron boron alloy smelting auxiliary equipment technical field, specific, relate to a kind of rare earth metal powder explosion -proof dust collecting device, including shell, filter bag chamber, backflush mechanism, dust-containing gas inlet, purified gas outlet, still include inert gas supply gas path, explosion suppressor, explosion vent. Nitrogen gas path is introduced on the one hand reduces the oxygen content in dust collecting device, makes oxygen concentration reduce, reduces the oxidation reaction of rare earth metal, reduces the generation of heat. On the other hand, nitrogen in nitrogen gas path low pressure gas path is obtained by high-pressure liquid nitrogen throttling pressure reduction, temperature is lower, it is favorable to reduce the temperature in dust collecting device. The introduction of nitrogen gas path greatly reduces the explosion risk, this is the conventional working process. By introducing explosion suppressor, explosion vent, cooling can be carried out when temperature is too high and pressure relief after explosion, to slow down the progress of explosion and protect the entire device after explosion.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for smelting rare earth hydrogen storage alloys or rapid solidification neodymium iron boron alloys, and more specifically, to an explosion-proof dust collection device for rare earth metal powders. Background Technology

[0002] Adding rare earth metals, such as lanthanum (La), cerium (Ce), praseodymium (Pr), and neodymium (Nd), to hydrogen storage alloys or rapidly solidified NdFeB alloys can significantly improve hydrogen storage performance. In the smelting process of hydrogen storage alloys or rapidly solidified NdFeB alloys, rare earth elements are generally added to the smelting furnace as bulk metals, with the final product being alloy ingots or alloy powder. During the product tapping or powdering process, to prevent the leakage of rare earth metal powder into the environment, dust collection devices need to be installed at points such as the tapping furnace, powdering equipment, and packaging areas to collect the metal powder.

[0003] Rare earth metal powders are flammable. Vacuum cleaners mostly use dry dust collectors. Due to the rapid oxidation of the powder surface and the release of heat, the powder can spontaneously combust inside the dust collector, leading to an explosion. Therefore, it is necessary to develop a rare earth metal powder collection device that can prevent explosions. Utility Model Content

[0004] To achieve the above objectives, this utility model provides an explosion-proof dust collection device for rare earth metal powder, comprising a shell, a filter bag chamber, a back-flushing mechanism, a dust-laden gas inlet, and a purified gas outlet, characterized in that it further comprises:

[0005] An inert gas supply path supplies gas to the dust-laden gas inlet and the backflushing mechanism;

[0006] An explosion suppressor is installed below the filter bag chamber. When the temperature inside the housing exceeds a certain value, the explosion suppressor sprays heat-absorbing powder into the housing.

[0007] The explosion relief doors are located on both sides of the housing and can be opened to release pressure when the pressure is too high.

[0008] In a further improvement, the inert gas supply path includes a high-pressure branch and a low-pressure branch. The high-pressure branch is connected to the backflushing mechanism, and the outlet of the low-pressure branch is located at the dust-laden gas inlet.

[0009] In a further improvement, the explosion suppressor includes a high-pressure storage tank, and a solenoid valve is installed at the outlet of the high-pressure storage tank. The solenoid valve is opened when the temperature exceeds a set temperature.

[0010] In a further improvement, there are two high-pressure storage tanks, symmetrically arranged, with the outlets of the high-pressure storage tanks facing inwards.

[0011] As a further improvement, the high-pressure storage tank is connected to the high-pressure branch of the inert gas supply circuit to help reduce the heat released by oxidation.

[0012] A further improvement is made to the explosion relief door, which includes a baffle mesh installed in an opening in the side wall of the housing. An explosion relief disc is also installed in the opening in the side wall of the housing, and the explosion relief disc is tightly attached to the outer side of the baffle mesh. Under negative pressure, the baffle mesh provides structural support for the explosion relief disc.

[0013] As a further improvement, the explosion relief disc uses a stainless steel-graphite composite membrane.

[0014] The application of the technical solution of this utility model has the following technical effects:

[0015] (1) The rare earth metal powder explosion-proof dust collection device provided by this utility model introduces a nitrogen gas path to reduce the oxygen content in the dust collection device, thereby reducing the oxygen concentration, reducing the oxidation reaction of rare earth metals, and reducing heat generation. On the other hand, the nitrogen in the low-pressure nitrogen gas path is obtained by throttling and depressurizing high-pressure liquid nitrogen, which has a lower temperature and helps to reduce the temperature inside the dust collection device. The introduction of the nitrogen gas path significantly reduces the risk of explosion, which is a standard operating procedure.

[0016] (2) By introducing an explosion suppressor and an explosion relief door, this utility model can cool down when the temperature is too high and relieve pressure after an explosion, so as to slow down the progress of the explosion and protect the entire device after the explosion occurs. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A front view of a rare earth metal powder explosion-proof dust collection device according to the present invention is shown;

[0019] Figure 2 A side view of the rare earth metal powder explosion-proof dust collection device according to this utility model is shown;

[0020] Figure 3 It shows Figure 2 Enlarged view of a portion of point A in the middle;

[0021] Figure 4 It shows Figure 2 Sectional view of AA;

[0022] Figure 5 A perspective view of the rare earth metal powder explosion-proof dust collection device of this utility model is shown.

[0023] The above figures include the following reference numerals:

[0024] 1. Shell;

[0025] 11. Filter bag chamber;

[0026] 12. Clean gas chamber;

[0027] 13. Backflush device;

[0028] 14. Dust-laden gas inlet;

[0029] 15. Purified gas outlet;

[0030] 2. Explosion suppressor;

[0031] 21. High-pressure storage tank;

[0032] 22. High-pressure air inlet of high-pressure storage tank;

[0033] 23. High-pressure storage tank outlet;

[0034] 24. Solenoid valve;

[0035] 3. Explosion relief door;

[0036] 31. Barrier net;

[0037] 32. Leaking explosive film. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figure 1-3 As shown, the rare earth metal powder explosion-proof dust collection device includes a housing 1. The lower part of the housing 1 is a filter bag chamber 11 where filter bags are installed. Above the filter bag chamber 11 is a clean gas chamber 12. The filter bag outlet is installed on the bottom wall of the clean gas chamber 12. The clean gas chamber 12 is equipped with a back-blowing device 13 to back-blow and clean the filter bags. The side wall of the housing 1 has a dust-laden gas inlet 14 and a purified gas outlet 15. The above describes the existing structure of the dust collector; the improved parts of this embodiment are described below.

[0040] The first improvement involves introducing a nitrogen gas supply system, including a high-pressure nitrogen supply system and a low-pressure nitrogen supply system. The high-pressure nitrogen supply system replaces the original backflushing gas source, while the low-pressure nitrogen supply system connects to the dust-laden gas inlet at point 14. Introducing the nitrogen supply system reduces the oxygen content within the dust collection device, lowering the oxygen concentration and reducing the oxidation reaction of rare earth metals, thus reducing heat generation. Furthermore, the nitrogen in the low-pressure nitrogen supply system is obtained through throttling and depressurization of high-pressure liquid nitrogen, resulting in a lower temperature, which helps to reduce the temperature within the dust collection device. The introduction of the nitrogen supply system significantly reduces the risk of explosion, which is a standard operating procedure.

[0041] The second improvement involves installing an explosion suppressor 2 below the filter bag chamber. The function of the explosion suppressor 2 is to spray sodium bicarbonate into the filter bag chamber 11 when the temperature exceeds a certain value. The explosion suppressor 2 includes a high-pressure storage tank 21, which contains sodium bicarbonate powder. An array of high-pressure inlets 22 are arranged at the bottom of the high-pressure storage tank 21, which can be connected to a high-pressure branch of the nitrogen gas path. The top of the high-pressure storage tank 21 has a high-pressure storage tank outlet 23, which is equipped with a solenoid valve 24. The end of the high-pressure storage tank outlet 23 is located inside the filter bag chamber 11. Under the control of the controller, when the temperature of the filter bag chamber 11 exceeds a set temperature (e.g., 130 degrees Celsius), the solenoid valve 24 opens, allowing the sodium bicarbonate powder to enter the filter bag chamber 11 under the action of the high-pressure airflow, decompose and absorb heat, thus lowering the temperature of the filter bag chamber 11. This is a safety measure to prevent accidents in the rare earth metal powder explosion-proof dust collection device. Additionally, a filling port can be provided on the shoulder of the high-pressure storage tank to replenish sodium bicarbonate powder into the high-pressure storage tank 21. In this embodiment, there are two storage tanks, symmetrically arranged, with the outlet of the high-pressure storage tank facing inward.

[0042] The third improvement involves installing explosion relief doors 3 on both sides of the housing 1. These doors 3 connect to the filter bag chamber 11 through openings. Each explosion relief door 3 includes a baffle 31 installed in an opening in the side wall of the housing. An explosion relief plate 32 is installed in the opening of the side wall of the housing, and the explosion relief plate 32 is tightly attached to the outer side of the baffle. The explosion relief plate is made of a stainless steel-graphite composite membrane. When the temperature of the filter bag chamber 11 becomes too high and an explosion occurs, the stainless steel-graphite composite membrane is damaged, releasing the pressure in the filter bag chamber 11, thereby protecting the safety of the entire structure. This is a remedial measure in the event of an accidental explosion.

[0043] The above improvements can reduce the risk of explosion during normal operation and delay the development of accidents and protect the entire unit from damage in the event of an accident.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rare earth metal powder explosion-proof dust collection device, comprising a shell, a filter bag chamber, a back-flushing mechanism, a dust-laden gas inlet, and a purified gas outlet, characterized in that, Also includes: An inert gas supply path supplies gas to the dust-laden gas inlet and the backflushing mechanism; An explosion suppressor is installed below the filter bag chamber. When the temperature inside the housing exceeds a certain value, the explosion suppressor sprays heat-absorbing powder into the housing. Explosion relief doors are located on both sides of the housing.

2. The rare earth metal powder explosion-proof dust collection device as described in claim 1, characterized in that, The inert gas supply circuit includes a high-pressure branch and a low-pressure branch. The high-pressure branch is connected to the backflushing mechanism, and the outlet of the low-pressure branch is located at the dust-laden gas inlet.

3. The rare earth metal powder explosion-proof dust collection device as described in claim 2, characterized in that, The explosion suppressor includes a high-pressure storage tank, and a solenoid valve is installed at the outlet of the high-pressure storage tank.

4. The rare earth metal powder explosion-proof dust collecting apparatus according to claim 3, wherein There are two high-pressure storage tanks, arranged symmetrically, with the outlets of the high-pressure storage tanks facing inwards.

5. The rare earth metal powder explosion-proof dust collecting apparatus according to claim 4, wherein The high-pressure storage tank is connected to the high-pressure branch of the inert gas supply circuit.

6. The rare earth metal powder explosion-proof dust collecting apparatus according to claim 1, wherein The explosion relief door includes a baffle mesh installed in an opening in the side wall of the housing. An explosion relief disc is also installed in the opening in the side wall of the housing, and the explosion relief disc is in close contact with the outside of the baffle mesh.

7. The rare earth metal powder explosion-proof dust collection device as described in claim 6, characterized in that, The explosion relief disc is made of stainless steel-graphite composite membrane.

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