A powder tank deoxidation system and a deoxidation method

Abstract

The present invention belongs to the technical field of chemical equipment, and specifically relates to a powder tank deoxidation system and a deoxidation method, including a powder tank, a feed pipeline, an exhaust pipeline, a vacuum pump and a degassing nitrogen inlet pipeline. The feed pipeline is used to send powder into the powder tank under the action of a conveying gas. The exhaust pipeline includes a feed exhaust line and a pressurized exhaust line. The feed exhaust line is used to discharge the conveying gas filtered by the bag filter from the powder tank. The vacuum pump is connected to the exhaust pipeline and is used to evacuate the powder tank. The degassing nitrogen inlet pipeline is used to fill the powder tank in a vacuum environment with nitrogen multiple times at different flow rates, and the nitrogen filled into the powder tank can be discharged through the pressurized exhaust line. The present invention is a process system that can realize the whole process of nitrogen filling, exhaust and vacuum pumping. Through precise design of the process technology, it can meet the technical requirements of the whole system for deoxidation, and can reduce the oxygen content to less than 100 ppm within 100 minutes, having the advantages of high deoxidation efficiency and good effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical equipment, and particularly relates to a powder tank deoxidation system and a deoxidation method. Background Art

[0002] In the process of chemical production, there may be a need to remove oxygen from the environment of bulk materials. It is necessary to go through several processes of nitrogen filling, exhaust, and vacuum pumping for the tank loaded with powder to achieve that the oxygen content inside the tank is almost zero, and the powder with qualified deoxidation is supplied for downstream use.

[0003] Therefore, it is necessary to design a powder tank deoxidation system and a deoxidation method, and precisely design the process of nitrogen filling, exhaust, and vacuum pumping (including flow control, time control, and oxygen content control for each process), so as to meet the deoxidation requirements of the whole system. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of low deoxidation efficiency and poor effect of powder tanks in the prior art, and provide a powder tank deoxidation system and a deoxidation method.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a powder tank deoxidation system, comprising:

[0006] A powder tank;

[0007] A feed pipeline, which is used to send powder into the powder tank under the action of conveying gas;

[0008] An exhaust pipeline, which includes a feed exhaust line and a pressure - relief exhaust line. The feed exhaust line is used to discharge the conveying gas filtered by a bag filter from the powder tank;

[0009] A vacuum pump, which is connected to the exhaust pipeline and is used to evacuate the powder tank;

[0010] A degassing nitrogen inlet line, which is used to fill the powder tank in a vacuum environment with nitrogen in multiple times with different flow rates, and the nitrogen filled into the powder tank can be discharged through the pressure - relief exhaust line.

[0011] Preferably, the exhaust pipeline and the degassing nitrogen inlet line are respectively arranged at the upper and lower ends of the powder tank, and the feed pipeline is arranged between the exhaust pipeline and the degassing nitrogen inlet line.

[0012] Preferably, a discharge - assisting flow - guiding nitrogen pipeline is further provided at the lower end of the powder tank, and an inflation filter cloth is arranged inside the powder tank at the positions corresponding to the degassing nitrogen inlet line and the discharge - assisting flow - guiding nitrogen pipeline.

[0013] Preferably, a bag filter reverse - blowing pipeline is provided above the powder tank where the bag filter is located.

[0014] Preferably, an oxygen content monitor is provided on the exhaust pipeline, and a protective filter and a vacuum gauge are also provided between the vacuum pump and the powder tank.

[0015] Preferably, a differential pressure transmitter, a pressure sensor and a level switch are also provided on the powder tank.

[0016] A deoxidation method for a powder tank deoxidation system includes the following steps:

[0017] Step 1, feeding: The powder is fed into the powder tank by the feeding pipeline under the action of the conveying gas. The conveying gas is filtered by the bag filter and then discharged through the feeding exhaust pipeline. When the level switch alarms, the feeding pipeline stops feeding;

[0018] Step 2, first vacuum pumping: After the feeding is completed, start the vacuum pump and pump air from the powder tank until the value of the vacuum gauge is 95 Kpag, then turn off the vacuum pump;

[0019] Step 3, first nitrogen filling: Fill nitrogen into the powder tank at a nitrogen filling flow rate of 150 Nm3 / h until the value of the pressure sensor is 50 Kpag;

[0020] Step 4, second nitrogen filling: Fill nitrogen into the powder tank at a nitrogen filling flow rate of 540 Nm3 / h until the value of the pressure sensor is 300 Kpag;

[0021] Step 5, nitrogen discharging: Open the pressurized exhaust pipeline. When the value of the pressure sensor discharges from 300 Kpag to 30 Kpag, close the pressurized exhaust pipeline;

[0022] Step 6, second vacuum pumping: Start the vacuum pump and pump air from a pressure of 30 Kpag until the value of the vacuum gauge is 95 Kpag, then turn off the vacuum pump;

[0023] Step 7, repeat the above steps 3-5, and the oxygen content less than 100 PPm can be achieved.

[0024] After adopting the above technical solution, a powder tank deoxidation system and a deoxidation method provided by the present invention have the following beneficial effects:

[0025] (1) The present invention is a process system that can realize the whole process of nitrogen filling, exhaust and vacuum pumping. Through precise design of the process of nitrogen filling, exhaust and vacuum pumping, it can meet the technical requirements of deoxidation of the whole system, and can reduce the oxygen content to less than 100 PPm within 100 minutes, having the advantages of high deoxidation efficiency and good effect.

[0026] (2) During the pressurization process of the present invention, the nitrogen filling flow rate can be controlled according to different pressure sections in the powder tank, so that the gas velocity entering the filter cloth is relatively uniform, and the service life of the equipment is prolonged. Description of the Drawings

[0027] Figure 1 This is the process flow diagram of a deoxidation system for a powder tank of the present invention.

[0028] Among them: degassing nitrogen inlet line 1, inflation filter cloth 2, powder tank 3, feed pipeline 4, bag filter 5, vacuum pump 6, protection filter 7, vacuum gauge 8, feed exhaust line 9, pressurized exhaust line 10, oxygen content monitor 11, bag filter backflush air pipeline 12, differential pressure transmitter 13, pressure sensor 14, level switch 15, discharge flow-aid nitrogen pipeline 16. Specific embodiments

[0029] The present invention will be further clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. [[ID=?]]

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0033] For the sake of convenience in description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0034] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0035] As Figure 1 shown, a powder tank deoxidation system provided by the present invention includes a powder tank 3. An inlet pipeline 4, an exhaust pipeline and a degassing nitrogen inlet line 1 are provided on the powder tank 3. The inlet pipeline 4 is used to feed powder into the powder tank 3 under the action of a conveying gas and can stop feeding powder into the powder tank 3 when the level switch of the powder tank 3 alarms. The exhaust pipeline includes an inlet exhaust line 9 and a pressurized exhaust line 10. The inlet exhaust line 9 is used to discharge the conveying gas filtered by a bag filter 5 from the powder tank 3. A vacuum pump 6 is connected to the exhaust pipeline to evacuate the powder tank 3. The degassing nitrogen inlet line 1 is used to perform multiple nitrogen filling with different flow rates on the powder tank 3 in a vacuum environment, and the nitrogen filled into the powder tank 3 can be discharged through the pressurized exhaust line 10.

[0036] Furthermore, the exhaust pipeline and the degassing nitrogen inlet line 1 are respectively arranged at the upper and lower ends of the powder tank 3, the feed pipeline 4 is arranged between the exhaust pipeline and the degassing nitrogen inlet line 1, a discharging auxiliary flow nitrogen pipeline 16 is further arranged at the lower end of the powder tank 3, an inflation filter cloth 2 is arranged inside the powder tank 3 at the positions corresponding to the degassing nitrogen inlet line 1 and the discharging auxiliary flow nitrogen pipeline 16, a bag filter reverse blowing pipeline 12 is arranged above the powder tank 3 where the bag filter 5 is located, an oxygen content monitor 11 is arranged on the exhaust pipeline, a protection filter 7 and a vacuum gauge 8 are further arranged between the vacuum pump 6 and the powder tank 3, and a differential pressure transmitter 13, a pressure sensor 14 and a level switch 15 are also arranged on the powder tank 3.

[0037] The present invention also provides a deoxidation method for a powder tank deoxidation system, comprising the following steps:

[0038] Step 1, feeding: The powder is fed into the powder tank 3 by the feed pipeline 4 under the action of the conveying gas. The conveying gas is filtered by the bag filter 5 and then discharged through the feed exhaust line 9. When the level switch 15 alarms, the feed pipeline 4 stops feeding.

[0039] Step 2, first vacuum pumping: After the feeding is completed, the vacuum pump 6 is started, and the powder tank 3 is evacuated until the value of the vacuum gauge 8 is 95 Kpag, then the vacuum pump 6 is closed.

[0040] Step 3, first nitrogen filling: The powder tank 3 is filled with nitrogen at a nitrogen filling flow rate of 150 Nm3 / h until the value of the pressure sensor 14 is 50 Kpag.

[0041] Step 4, second nitrogen filling: The powder tank 3 is filled with nitrogen at a nitrogen filling flow rate of 540 Nm3 / h until the value of the pressure sensor 14 is 300 Kpag.

[0042] Step 5, nitrogen discharging: The pressure exhaust line 10 is opened. When the value of the pressure sensor 14 is exhausted from 300 Kpag to 30 Kpag, the pressure exhaust line 10 is closed.

[0043] Step 6, second vacuum pumping: The vacuum pump 6 is started, and the powder tank 3 is evacuated from a pressure of 30 Kpag until the value of the vacuum gauge 8 is 95 Kpag, then the vacuum pump 6 is closed.

[0044] Step 7, repeat the above steps 3 - 5, and the oxygen content less than 100 PPm can be achieved.

[0045] Example 1

[0046] Information such as the volume and filling amount of the powder tank is shown in the following table:

[0047]

[0048] First vacuum pumping: Starting pressure 0 barg, pumped to -95 Kpag, pumping capacity 150 m3 / h, 17.65 minutes;

[0049] First nitrogen filling: Filling nitrogen from -95 Kpag to 0.5 barg, filling gas flow rate 150 Nm3 / h, 8.144 minutes;

[0050] Second nitrogen filling: Filling nitrogen from 0.5 barg to 3.0 barg, filling gas flow rate 540 Nm3 / h, 3.9335 minutes;

[0051] Nitrogen discharging: Exhausting from 3 barg to 30 Kpag, 12.22 minutes;

[0052] Second vacuum pumping: Starting pressure 30 Kpag, pumped to -95 Kpag, 19.30 minutes;

[0053] Repeating the first nitrogen filling: Filling nitrogen from -95 Kpag to 0.5 barg, filling gas flow rate 150 Nm3 / h, 8.144 minutes;

[0054] Repeating the second nitrogen filling: Filling nitrogen from 0.5 barg to 3.0 barg, filling gas flow rate 540 Nm3 / h, 3.9335 minutes;

[0055] Repeating the nitrogen discharging: Exhausting from 3 barg to 30 Kpag, 12.22 minutes.

[0056] Total time consumed is 85.545 minutes, and the final oxygen content in the test is less than 100 PPm, which meets the technical requirement of reducing the oxygen content to within 100 PPm within 100 minutes.

[0057] As mentioned above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A deoxidation method for a deoxidation system of a powder tank, characterized in that, The powder tank deoxidation system includes: A powder tank (3); A feed pipeline (4) for feeding powder into the powder tank (3) under the action of a conveying gas; An exhaust pipeline including a feed exhaust line (9) and a pressurized exhaust line (10). The feed exhaust line (9) is used to discharge the conveying gas filtered by the bag filter (5) from the powder tank (3); A vacuum pump (6) connected to the exhaust pipeline for evacuating the powder tank (3); A degassing nitrogen inlet line (1) for filling the powder tank (3) in a vacuum environment with nitrogen multiple times at different flow rates, and the nitrogen filled into the powder tank (3) can be discharged through the pressurized exhaust line (10); The deoxidation method includes the following steps: Step 1, feeding: The powder is fed into the powder tank (3) by the feed pipeline (4) under the action of a conveying gas. The conveying gas is filtered by the bag filter (5) and then discharged to the atmosphere through the feed exhaust line (9). When the level switch (15) alarms, the feed pipeline (4) stops feeding; Step 2, first vacuum pumping: After feeding is completed, start the vacuum pump (6) and evacuate the powder tank (3) until the value of the vacuum gauge (8) is 95 Kpag, then turn off the vacuum pump (6); Step 3, first nitrogen filling: Fill the powder tank (3) with nitrogen at a filling gas flow rate of 150 Nm3 / h until the value of the pressure sensor (14) is 50 Kpag; Step 4, second nitrogen filling: Fill the powder tank (3) with nitrogen at a filling gas flow rate of 540 Nm3 / h until the value of the pressure sensor (14) is 300 Kpag; Step 5, nitrogen discharging: Open the pressurized exhaust line (10). When the value of the pressure sensor (14) discharges from 300 Kpag to 30 Kpag, close the pressurized exhaust line (10); Step 6, second vacuum pumping: Start the vacuum pump (6) and evacuate from a pressure of 30 Kpag until the value of the vacuum gauge (8) is 95 Kpag, then turn off the vacuum pump (6); Step 7, repeat the above steps 3 - 5 to achieve an oxygen content less than 100 PPm.

2. The deoxidation method of a powder tank deoxidation system according to claim 1, characterized in that: The exhaust pipeline and the degassing nitrogen inlet line (1) are respectively arranged at the upper and lower ends of the powder tank (3), and the feed pipeline (4) is arranged between the exhaust pipeline and the degassing nitrogen inlet line (1).

3. The deoxidation method of a powder tank deoxidation system according to claim 1, characterized in that: A discharging assisting flow nitrogen pipeline (16) is also provided at the lower end of the powder tank (3), and an inflation filter cloth (2) is arranged inside the powder tank (3) corresponding to the positions of the degassing nitrogen inlet line (1) and the discharging assisting flow nitrogen pipeline (16).

4. The deoxidation method of a powder tank deoxidation system according to claim 1, characterized in that: A bag filter reverse blowing pipeline (12) is provided above the powder tank (3) where the bag filter (5) is located.

5. The deoxidation method of a powder tank deoxidation system according to claim 1, characterized in that: An oxygen content monitor (11) is provided on the exhaust pipeline, and a protection filter (7) and a vacuum gauge (8) are also provided between the vacuum pump (6) and the powder tank (3).

6. The deoxidation method of a powder tank deoxidation system according to claim 1, characterized in that: A differential pressure transmitter (13), a pressure sensor (14), and a level switch (15) are also provided on the powder tank (3).

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