CN217004037U - Neodymium iron boron permanent magnet material production process protective gas recycling system - Google Patents
Neodymium iron boron permanent magnet material production process protective gas recycling system Download PDFInfo
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- CN217004037U CN217004037U CN202220631858.8U CN202220631858U CN217004037U CN 217004037 U CN217004037 U CN 217004037U CN 202220631858 U CN202220631858 U CN 202220631858U CN 217004037 U CN217004037 U CN 217004037U
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Abstract
The utility model discloses a protective gas recycling system in a neodymium iron boron permanent magnet material production process, and relates to the field of protective gas recycling in the production process. The system is realized on the basis of a recovery pipeline of a glove box, waste gas is collected by a waste gas tank, a gas outlet is connected with a first-stage supercharger, a gas outlet of the first-stage supercharger is connected with a gas inlet of a supercharging tank, a gas outlet of the supercharging tank is connected with a second-stage supercharger, a gas outlet of the supercharging tank is connected with a nitrogen inlet connected with a nitrogen purification device, a gas outlet of the supercharging tank is connected with a gas inlet of a high-purity nitrogen tank, and a gas outlet of the high-purity nitrogen tank is connected with a protective gas inlet pipeline of equipment. The device can also comprise a nitrogen supplementing system, and the parallel gas supplementing nitrogen making machine is used for supplementing gas to adjust the insufficient use amount in the production process; the system is also provided with a main emptying pipe for emptying the whole system, and the valves and the compressor nitrogen making machine are controlled by the control system. The utility model can reduce the use cost of nitrogen in the production process, and can reduce or even replace the gas supply of liquid nitrogen when improving the nitrogen preparation purity.
Description
Technical Field
The utility model relates to the field of recovery, treatment and recycling of protective gas in a production process, in particular to a system for recovering and recycling protective gas in a production process of a neodymium iron boron permanent magnet material.
Background
In high new energy neodymium iron boron production, adopt nitrogen gas as protective gas usually, in powder suppression, group oil charge link have impurity such as air, petrol volatile gas sneak into protective gas, also for making things convenient for operating personnel to operate at the glove box simultaneously, need handle sleeve case pressure reduction, consequently the unable direct reutilization of protective gas, all directly discharge this kind of gas at present, cause a large amount of wasting of resources. Therefore, in order to reduce the waste of resources, an apparatus or system for recycling the shielding gas may be developed.
Disclosure of Invention
The utility model provides a protective gas recycling system in a neodymium iron boron permanent magnet material production process, aiming at solving the problems that process protective gas is wasted and gas cannot be supplied uninterruptedly in the neodymium iron boron permanent magnet material production process.
In the production process of the neodymium iron boron permanent magnet material, a plurality of magnetic field presses, oil stirring tanks and the like are usually included, and when the magnetic field presses and the oil stirring tanks are not provided with a protective gas recovery system, the used protective gas is output from a liquid nitrogen tank; every magnetic field press or group oil tank all are provided with the glove box that corresponds alone, be provided with oxygen content control unit on every glove box, total ball valve, retrieve the solenoid valve, evacuation ball valve and evacuation solenoid valve, it opens or closes by oxygen content control unit control to retrieve solenoid valve and evacuation solenoid valve, after total ball valve is connected to the gas outlet of glove box, two pipelines of shunting, be the recovery pipeline all the way, by retrieving ball valve and recovery solenoid valve control, another way is the evacuation pipeline, by evacuation ball valve and evacuation solenoid valve control, and insert total evacuation pipe. The utility model is realized on the basis that the glove box already has a recovery pipeline.
The utility model is realized by the following technical scheme: a protective gas recycling system in the production process of neodymium iron boron permanent magnet materials comprises a waste gas tank, the air inlet of the waste gas tank is connected with the recovery main collecting pipeline through a flange, a ball valve and a control valve, the air outlet is connected with the air inlet of the first-stage supercharger through the flange, the ball valve, the control valve and a connecting hose in sequence, the air outlet of the primary booster is connected with the air inlet of the booster tank through a one-way valve, a pressure regulating valve, a control valve and a flange in sequence, the gas outlet of the pressure charging tank is connected with a secondary pressure charging device through a flange and a ball valve, the secondary pressure charging device is connected with a nitrogen inlet connected with a nitrogen purifying device through a one-way valve, the ball valve and a control valve in sequence, a feedback pressure gauge is also arranged at the air outlet of the secondary booster, the air outlet of the nitrogen purification device is connected with the air inlet of the high-purity nitrogen tank through a ball valve and a flange, the gas outlet of the high-purity nitrogen tank is connected with a protective gas inlet pipeline of the equipment through a flange and a control valve; the recovery main collection pipeline is connected with a main emptying pipe through a ball valve and a control valve; the nitrogen purification device is connected with the main emptying pipe through a control valve; the recovery total collection pipeline is connected to recovery pipelines of glove boxes of a plurality of working devices; and the secondary supercharger, the feedback pressure gauge, the control valve and the pressure regulating valve are all connected with the control system through signal connecting lines and are controlled by the control system.
The utility model is realized on the basis that the glove box has a recovery pipeline, and mainly adopts the process that the recovery pipelines of a plurality of glove boxes are gathered and enter an exhaust gas tank to pressurize and purify the exhaust gas, and then the exhaust gas is stored and reused. The method comprises the steps of firstly recovering protective gas used by some equipment with larger gas consumption, namely, collecting recovery pipelines of a glove box to a recovery main collecting pipeline, then reaching a waste gas tank, arranging a ball valve and a control valve on an air inlet pipeline reaching the waste gas tank, connecting the waste gas tank and all connected pipelines by flanges, wherein the ball valve is a switch valve, the control valve is controlled to be switched on and off by a control system, emptying or recovering operations can be carried out when the two valves are simultaneously opened, an air outlet of the waste gas tank is connected with an air inlet of a primary supercharger sequentially through the flange, the ball valve, the control valve and a connecting hose, because the primary supercharger is usually in a vibration state, the waste gas tank is flexibly connected with the primary supercharger, when the ball valve and the control valve are opened, the gas in the waste gas tank enters through the primary supercharger through the pipelines and is pressurized, and the air outlet of the primary supercharger sequentially passes through a one-way valve, The pressure regulating valve, the control valve and the flange are connected with the air inlet of the pressure boost tank, the check valve prevents the gas from flowing back, the pressure regulating valve regulates the pressure of the gas outlet and the gas enters the pressure boost tank to store the gas after primary pressure boost, the gas inlet and outlet of the pressure boost tank are connected with the pipeline by flanges, the pressure boost tank enters the secondary pressure booster by the ball valve and the pipeline, the secondary pressure booster is used for carrying out secondary pressure boost on the gas to ensure that the gas reaches the initial required pressure, if nitrogen supplement is carried out, the gas is matched with the pressure provided by the nitrogen supplement system to form mixed gas, the secondary pressure booster is connected with the nitrogen inlet connected with the nitrogen purification device by the check valve, the ball valve and the control valve in sequence, a feedback pressure gauge is arranged at the air outlet of the secondary pressure booster and used for feeding back the pressure of the gas outlet to the control system, and the nitrogen meeting the pressure condition enters the nitrogen purification device for purification, generally, the gas entering the nitrogen purification device is general nitrogen or a mixed gas of general nitrogen and waste gas, the purification device purifies the entering gas, the gas outlet discharges high-purity nitrogen, the gas outlet is connected with the gas inlet of a high-purity nitrogen tank through a ball valve and a flange and is used for storing the high-purity nitrogen, the gas outlet of the high-purity nitrogen tank is connected with a protective gas inlet pipeline of equipment through the flange and a control valve, if the control valve is closed, the high-purity nitrogen has a storage effect, if the control valve is opened, the nitrogen enters the equipment to be reused, and because the nitrogen cannot be interrupted in the neodymium iron boron production process, the high-purity liquid nitrogen is connected to the tail end of the gas recovery and purification to ensure that the protective gas is uninterruptedly supplied in the production process, when the recovered and used nitrogen does not reach the required pressure of the equipment, the liquid nitrogen tank supplies air. The recovery main collecting pipeline is connected with a main emptying pipe through a ball valve and a control valve, the representative waste gas tank is also connected with the main emptying pipe, and before the whole recovery process starts, the whole system needs to be subjected to gas emptying operation, so that the nitrogen purification device is also connected with the main emptying pipe through the control valve to perform emptying operation. The two-stage supercharger, the feedback pressure gauge, the control valve and the pressure regulating valve are connected with the control system through signal connecting lines and controlled by the control system, and are used for controlling the opening or closing of each valve, collecting pressure data and controlling the work of the two-stage supercharger.
Preferably, when the gas exhausted from the two-stage supercharger does not reach the initial required pressure, a nitrogen supplementing system is added to the whole system, the nitrogen supplementing system comprises a variable frequency compressor, the variable frequency compressor is connected with the control system through a signal connecting line and is controlled by the control system, an air outlet of the variable frequency compressor is connected with an air inlet of the cold dryer through a ball valve, the moisture in the gas is condensed and dried, the gas outlet of the cold dryer is connected with the gas inlet of the parallel gas and nitrogen supplementing and making machine through a ball valve, the gas outlet of the parallel gas-supplementing nitrogen-making machine is connected with the gas outlet pipeline of the secondary booster together through a one-way valve and a ball valve in turn, and a feedback pressure gauge is arranged at an air outlet of the parallel air supplementing and nitrogen making machine, and is connected with the control system through a signal connecting line and is controlled by the control system.
Preferably, the nitrogen purification device comprises a methanol cracking hydrogen production device, the methanol cracking hydrogen production device produces hydrogen by using methanol cracking, the air inlet of the nitrogen and the methanol cracking hydrogen production device are jointly connected to the air inlet of the catalytic purification device, and in the catalytic purification device, O is contained2Conversion to H2Removing oxygen and converting part of hydrocarbon, generating water and emitting a large amount of heat, connecting an air outlet at the bottom of the catalytic purification device to an air inlet of a condenser, cooling and dewatering the purified gas by a cooler, connecting an air outlet of the condenser to a gas-water separator, roughly separating water by the gas-water separator, connecting an air outlet of the gas-water separator to two adsorption towers which are arranged in parallel through an inlet valve group, and deeply removing oil, water and impurities of the gas by the adsorption towers to finish the purification process of the protective gas; the air outlets of the two adsorption towers which are arranged in parallel are connected with the air inlet of the high-purity nitrogen tank through an outlet valve group, a ball valve and a flange, and the inlet valve group is also connected with a main emptying pipe through a control valve. The inlet valve group and the outlet valve group are used for controlling the two adsorption towers to be mutually standby and alternately work, namely one adsorption tower works normally and the other adsorption tower works regeneratively and alternately. Furthermore, the catalytic purification device is a hydrogenation deaerator.
Preferably, the gas outlet of the waste gas tank is directly connected to the booster tank through a ball valve, and if the gas outlet pressure of the gas outlet of the waste gas tank is enough, the ball valve is opened to enable the gas outlet of the waste gas tank to directly enter the booster tank without passing through a first-stage booster; if the pressure is not reached, however, it is necessary to pass through a first stage booster.
Preferably, the first-stage supercharger adopts a negative pressure roots pump.
Preferably, a silencer is installed at the outlet of the main emptying pipe.
Preferably, the two-stage booster is a nitrogen variable frequency compressor.
Compared with the prior art, the utility model has the following beneficial effects: according to the protective gas recycling system in the production process of the neodymium iron boron permanent magnet material, the protective gas recycling system is additionally arranged on the exhaust outlet of the glove box, so that originally discharged low-purity nitrogen is recycled, and the use cost of the nitrogen in the production process is reduced; the recovered gas and the gas of the parallel supplemented nitrogen making machine are parallelly accessed into a recovery system, the gas supplementation of the nitrogen making machine is utilized to adjust the insufficient use amount in the production process, the purity of the nitrogen gas obtained by the nitrogen making machine is improved, and the gas supply of liquid nitrogen is reduced and even replaced; meanwhile, when the operation rate is low due to insufficient production capacity, the main system can also work normally.
Drawings
Fig. 1 is a schematic structural flow diagram of the present invention, in which the solid lines are pipeline connection lines and the dotted lines are signal connection lines.
FIG. 2 is a schematic view of the glove box of the present invention.
FIG. 3 is a schematic view of the nitrogen purification apparatus according to the present invention.
The figures are labeled as follows: 1-a waste gas tank, 2-a primary booster, 3-a booster tank, 4-a secondary booster, 5-a parallel air-supplementing nitrogen making machine, 6-a cold drying machine, 7-a variable frequency compressor, 8-a nitrogen purification device, 9-a high-purity nitrogen tank, 10-an oil stirring tank, 11-a recovery total collecting pipeline, 12-a total emptying pipe, 13-a magnetic field press, 14-a control system, 15-a signal connecting line, 16-a liquid nitrogen tank, 17-a glove box, 18-an oxygen content control unit, 19-a total ball valve, 20-a recovery ball valve, 21-a recovery electromagnetic valve, 22-an emptying ball valve, 23-an emptying electromagnetic valve, 801-a methanol cracking hydrogen making device, 802-a catalytic purification device, 803-a condenser and 804-an air-water separator, 805-adsorption column, 806-inlet valve group, 807-outlet valve group.
Detailed Description
The present invention is further illustrated by the following examples.
In the production process of the neodymium iron boron permanent magnet material, as shown in fig. 1, the production process generally comprises a plurality of magnetic field presses 13, oil stirring tanks 10 and the like, and when the magnetic field presses 13 and the oil stirring tanks 10 do not have a protective gas recovery system, the adopted protective gas is directly output from a liquid nitrogen tank 16; each magnetic field press 13 or the oil stirring box 10 is provided with an independent corresponding glove box 17, each glove box 17 is provided with an oxygen content control unit 18, a main ball valve 19, a recovery ball valve 20, a recovery electromagnetic valve 21, an emptying ball valve 22 and an emptying electromagnetic valve 23, the recovery electromagnetic valve 21 and the emptying electromagnetic valve 23 are controlled to be opened or closed by the oxygen content control unit 18, an air outlet of each glove box 17 is connected with the main ball valve and then branched into two pipelines, one pipeline is a recovery pipeline and is controlled by the recovery ball valve 20 and the recovery electromagnetic valve 21, the other pipeline is an emptying pipeline and is controlled by the emptying ball valve 22 and the emptying electromagnetic valve 23 and is connected into the main emptying pipe 12. The glove box comprises the following working processes: the glove box starts to exhaust oxygen, the oxygen content control unit 18 checks the oxygen content, when the oxygen content value in the glove box 17 is not reached, the recovery electromagnetic valve 21 is in a closed state, and the evacuation electromagnetic valve 23 is in an open state to perform evacuation and oxygen exhaust; when the set oxygen content value is reached, the evacuation solenoid valve 23 is in a closed state, and the recovery solenoid valve 21 is in an open state to recover nitrogen. This embodiment is implemented on the basis that the glove box already has a nitrogen recovery line.
A protection gas recycling system in the production process of a neodymium iron boron permanent magnet material is shown in figure 1: comprises a waste gas tank 1, wherein the gas inlet of the waste gas tank 1 is connected with a recovery main collecting pipeline 11 through a flange, a ball valve and a control valve, the gas outlet is connected with the gas inlet of a first-stage supercharger 2 through the flange, the ball valve, the control valve and a connecting hose in sequence, the air outlet of the first-stage supercharger 2 is connected with the air inlet of the supercharging tank 3 through a one-way valve, a pressure regulating valve, a control valve and a flange in sequence, the air outlet of the pressure charging tank 3 is connected with the secondary booster 4 through a flange and a ball valve, the secondary booster 4 is connected with the nitrogen inlet connected with the nitrogen purifying device 8 through a one-way valve, the ball valve and a control valve in sequence, a feedback pressure gauge is also arranged at the air outlet of the secondary booster 4, the air outlet of the nitrogen purification device 8 is connected with the air inlet of the high-purity nitrogen tank 9 through a ball valve and a flange, the gas outlet of the high-purity nitrogen tank 9 is connected with a protective gas inlet pipeline of the equipment through a flange and a control valve; the recovery main collecting pipeline 11 is connected with a main emptying pipe 12 through a ball valve and a control valve; the nitrogen purification device 8 is connected with a main emptying pipe 12 through a control valve; the recovery total collection pipeline 11 is connected to recovery pipelines of glove boxes 17 of a plurality of working devices; the two-stage supercharger 4, the feedback pressure gauge, the control valve and the pressure regulating valve are all connected with the control system 14 through signal connecting lines 15 and are controlled by the control system 14.
Still include the benefit nitrogen system in this embodiment, the benefit nitrogen system includes inverter compressor 7, inverter compressor 7 is connected with control system 14 through signal connection line 15 and is controlled by control system 14, inverter compressor 7's gas outlet is passed through the ball valve and is connected with the air inlet of cold machine 6 of doing, cold machine 6's gas outlet is passed through the ball valve and is connected with the air inlet of parallel tonifying qi nitrogen generator 5, parallel tonifying qi nitrogen generator 5's gas outlet loops through check valve and ball valve and then joins with the gas outlet pipeline of second grade booster 4 and inserts nitrogen purification device 8 jointly, parallel tonifying qi nitrogen generator 5's gas outlet department is provided with the feedback manometer, the feedback manometer is connected with control system 14 through signal connection line 15 and is controlled by control system 14.
The nitrogen purification device 8 related in the embodiment has the following structure, and comprises a methanol cracking hydrogen production device 801, wherein an air inlet of nitrogen and the methanol cracking hydrogen production device 801 are jointly connected to an air inlet of a catalytic purification device 802, an air outlet at the bottom of the catalytic purification device 802 is connected to an air inlet of a condenser 803, an air outlet of the condenser 803 is connected to a gas-water separator 804, an air outlet of the gas-water separator 804 is connected to two adsorption towers 805 arranged in parallel through an inlet valve group 806, air outlets of the two adsorption towers 805 arranged in parallel are connected to an air inlet of a high-purity nitrogen tank 9 through an outlet valve group 807, a ball valve and a flange, and the inlet valve group 806 is further connected to a main emptying pipe 12 through a control valve; further, the catalytic purification device 802 is a hydrodeoxygenation device.
The following preferred scheme is adopted in the embodiment: the gas outlet of the waste gas tank 1 is directly connected with the booster tank 3 through a ball valve; the first-stage supercharger 2 adopts a negative pressure roots pump; a silencer is arranged at the outlet of the main emptying pipe 12; the two-stage booster 4 is a nitrogen variable frequency compressor.
This embodiment a neodymium iron boron permanent magnet material production process protective gas recycle system, its concrete process of recycling is as follows:
(1) turning on a variable frequency compressor 7 and a cold dryer 6 to input oil-free and water-free compressed air to the parallel air supplementing nitrogen making machine 5, turning on a power switch, turning an automatic/manual knob to an automatic gear, pressing a start button when the pressure of an air tank in the nitrogen making machine rises to 0.5MPa, enabling the parallel air supplementing nitrogen making machine 5 to enter an automatic running state, slightly opening an emptying valve of nitrogen at the position for emptying, turning on a power supply of a nitrogen analyzer, supplying air to the nitrogen analyzer, adjusting the flow of an supplied air sample to a trace amount, and turning off the emptying valve to output common nitrogen after the nitrogen purity is reached;
(2) when the nitrogen recovery device is not started, the common nitrogen is input into the nitrogen purification device 8, the common nitrogen with the purity of more than 99.5 percent is purified and purified into the purity of more than 99.99 percent by the nitrogen purification device 8, and the common nitrogen is stored in a high-purity nitrogen tank 9 and is conveyed into a glove box 17 of each device; a main ball valve and an emptying ball valve are arranged on an emptying pipe of the glove box 17 of each large gas consumption device, and when the emptying in the glove box 17 meets the use requirement of oxygen content, a recovery branch pipe is arranged on the emptying pipe, namely a recovery pipeline, and is connected to a recovery main collection pipeline 11;
(3) opening a ball valve and a control valve, enabling the waste gas in the recovery main collecting pipeline 11 to enter a waste gas tank 1, starting a first-stage supercharger 2, namely starting a negative pressure roots pump, conveying the recovered waste gas to a supercharging tank 3, and increasing the pressure of the waste gas through a second-stage supercharger 4, namely a nitrogen variable-frequency compressor, so as to achieve the pressure balanced with a parallel gas supplementing nitrogen making machine 5;
(4) the general nitrogen pressure output by the parallel gas supplementing nitrogen making machine 5 and the waste gas pressure are balanced and mixed, the mixed nitrogen enters a nitrogen purification device 8, the purification device consists of a methanol cracking hydrogen making device 801, a hydrogenation deaerator, a condenser 803 and two adsorption towers 805 which are arranged in parallel in a connecting mode, the inlet ends of the two adsorption towers 805 are connected through an inlet valve group 806, the outlet ends of the two adsorption towers are connected through an outlet valve group 807, the inlet valve group 806 and the outlet valve group 807 are used for controlling the two adsorption towers to work alternately in a standby mode, namely, one adsorption tower works normally, and one regeneration workThe use is alternated; hydrogen production by methanol cracking, in a hydrodeoxygenation device, O2Conversion to H2Removing oxygen and part of hydrocarbon by O, generating water and releasing a large amount of heat, cooling the purified gas by a condenser to remove water, and separating the water by a gas-water separator 804; then the gas is deeply deoiled, dewatered and decontaminated by an adsorption type drying device, namely an adsorption tower 805, and the purification process of the protective gas is completed;
(5) outputting the nitrogen to a glove box of each device through a high-purity nitrogen tank to finish recycling; and a gas supplementing valve set, namely a liquid nitrogen tank, is arranged between the gas supplementing valve set and the liquid nitrogen pure nitrogen gas inlet pipe. In the recycling system, the parallel gas-supplementing nitrogen making machine 5 is used for adjusting the shortage of the usage amount in the production process, and simultaneously the purity of the nitrogen made by the parallel gas-supplementing nitrogen making machine 5 is improved, so that the nitrogen supply of liquid nitrogen is reduced and even replaced. As the nitrogen cannot be interrupted in the production process of the neodymium iron boron, high-purity liquid nitrogen gas is connected to the tail end of the gas recovery and purification, so that the uninterrupted supply of protective gas in the production process is ensured.
Through the specific process implementation of the embodiment, the gas consumption for full-load production is reduced to 2t/24h from the total consumption of 120 m/h of the original parallel gas supplementing nitrogen making machine and 5t/24h of liquid nitrogen, liquid nitrogen is comprehensively saved by 60% every day, and the production cost is greatly reduced.
The scope of the utility model is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the utility model should be included in the scope of the utility model.
Claims (8)
1. A neodymium iron boron permanent magnet material production process protective gas retrieves system of recycling which characterized in that: comprises a waste gas tank (1), wherein the gas inlet of the waste gas tank (1) is connected with a recovery total collecting pipeline (11) through a flange, a ball valve and a control valve, the gas outlet is connected with the gas inlet of a first-stage supercharger (2) through a flange, a ball valve, a control valve and a connecting hose, the gas outlet of the first-stage supercharger (2) is connected with the gas inlet of a booster tank (3) through a check valve, a pressure regulating valve, a control valve and a flange, the gas outlet of the booster tank (3) is connected with a second-stage supercharger (4) through a flange and a ball valve, the second-stage supercharger (4) is connected with a nitrogen inlet connected with a nitrogen purifying device (8) through a check valve, a ball valve and a control valve, a feedback pressure gauge is further arranged at the gas outlet of the second-stage supercharger (4), the gas outlet of the nitrogen purifying device (8) is connected with the gas inlet of a high-purity nitrogen tank (9) through a ball valve and a flange, the gas outlet of the high-purity nitrogen tank (9) is connected with a protective gas inlet pipeline of the equipment through a flange and a control valve; the recovery main collecting pipeline (11) is connected with a main emptying pipe (12) through a ball valve and a control valve; the nitrogen purification device (8) is connected with a main emptying pipe (12) through a control valve; the recovery total collection pipeline (11) is connected to recovery pipelines of glove boxes (17) of a plurality of working devices;
the two-stage supercharger (4), the feedback pressure gauge, the control valve and the pressure regulating valve are all connected with a control system (14) through signal connecting lines (15) and are controlled by the control system (14).
2. The protective gas recycling system for the neodymium iron boron permanent magnet material production process according to claim 1, characterized in that: the nitrogen supplementing system comprises a variable frequency compressor (7), the variable frequency compressor (7) is connected with a control system (14) through a signal connecting line (15) and is controlled by the control system (14), the air outlet of the variable frequency compressor (7) is connected with the air inlet of the cold dryer (6) through a ball valve, the air outlet of the cold dryer (6) is connected with the air inlet of the parallel air-supplementing nitrogen making machine (5) through a ball valve, the gas outlet of the parallel gas supplementing and nitrogen making machine (5) is connected with a gas outlet pipeline of the secondary booster (4) together after passing through a one-way valve and a ball valve in turn and then is connected with a nitrogen purifying device (8), and a feedback pressure gauge is arranged at an air outlet of the parallel air supplementing and nitrogen making machine (5), and is connected with the control system (14) through a signal connecting line (15) and is controlled by the control system (14).
3. The protective gas recycling system for the neodymium iron boron permanent magnet material production process according to claim 1, characterized in that: nitrogen gas purification device (8) are including methyl alcohol schizolysis hydrogen plant (801), the air inlet of nitrogen gas and methyl alcohol schizolysis hydrogen plant (801) insert catalytic purification device (802) jointly, the gas outlet of catalytic purification device (802) bottom is connected in the air inlet of condenser (803), the gas outlet of condenser (803) is connected in deareator (804), the gas outlet of deareator (804) is connected two adsorption towers (805) that set up side by side through import valve group (806), and the gas outlet of two adsorption towers (805) that set up side by side is connected with the air inlet of high-purity nitrogen jar (9) through export valve group (807), ball valve and flange, import valve group (806) still connects total evacuation pipe (12) through the control valve.
4. The system of claim 3 for recycling protective gas in the production process of NdFeB permanent magnet material, which is characterized in that: the catalytic purification device (802) is a hydrogenation deaerator.
5. The protective gas recycling system for the neodymium iron boron permanent magnet material production process according to claim 1, characterized in that: and the air outlet of the waste gas tank (1) is directly connected with the booster tank (3) through a ball valve.
6. The system of claim 1 for recycling protective gas during production of neodymium iron boron permanent magnet materials, characterized in that: the first-stage supercharger (2) adopts a negative pressure roots pump.
7. The protective gas recycling system for the neodymium iron boron permanent magnet material production process according to claim 1, characterized in that: and a silencer is arranged at the outlet of the main emptying pipe (12).
8. The protective gas recycling system for the neodymium iron boron permanent magnet material production process according to claim 1, characterized in that: the two-stage booster (4) is a nitrogen variable-frequency compressor.
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| CN202220631858.8U CN217004037U (en) | 2022-03-23 | 2022-03-23 | Neodymium iron boron permanent magnet material production process protective gas recycling system |
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| CN202220631858.8U CN217004037U (en) | 2022-03-23 | 2022-03-23 | Neodymium iron boron permanent magnet material production process protective gas recycling system |
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