CN210186488U - Gas-liquid separation device for EC pneumatic conveying pipeline - Google Patents

Abstract

The utility model relates to a lithium cell electrolyte production facility field, specific gas-liquid separation for EC pneumatic conveying pipeline that says so. Comprises an EC conveying pipe, a gas-liquid separation pipe and a buffer tank; a first switch valve and a second switch valve are respectively arranged at two ends of the EC conveying pipe; the lower end of the gas-liquid separation pipe is fixed at the position of a strip-shaped hole formed in the EC conveying pipe in a welding mode, and one side, facing the first switch valve, of the lower end of the gas-liquid separation pipe is arc-shaped, so that a gas guide section for guiding gas in the EC conveying pipe towards the direction of the buffer tank is formed; the buffer tank is provided with an interlayer, the lower part of the inner cavity of the buffer tank is communicated with the gas-liquid separation pipe, and the upper part of the inner cavity is connected with the vacuum pump through the exhaust pipe. The utility model discloses bubble automatic discharge in the steerable EC solvent to make the addition of fluidflowmeter accurate measurement EC solvent, and then improve the quality of lithium cell electrolyte product.

Description

Gas-liquid separation device for EC pneumatic conveying pipeline

Technical Field

The utility model relates to a lithium cell electrolyte production facility field, specific gas-liquid separation for EC pneumatic conveying pipeline that says so.

Background

EC, ethylene carbonate, is an excellent solvent for lithium battery electrolytes in the battery industry. In the existing production of lithium battery electrolyte, an EC solvent stored in an EC pure product tank is generally conveyed by a pipeline through a pneumatic conveying device, is metered by a liquid flowmeter, is introduced into a preparation kettle, and is uniformly mixed with other raw materials of lithium battery electrolyte and reacts in the preparation kettle.

In actual production, it is found that because the EC conveying pipeline is provided with conveying power by nitrogen, a large amount of nitrogen bubbles often remain in the conveyed EC solvent, especially in the EC solvent at the initial stage of pneumatic conveying, which results in that the actual throughput of the EC solvent cannot be accurately measured by a liquid flow meter, and further results in that the composition of each batch of products has a large difference, which is not beneficial to improving the consistency of the products, and especially cannot meet the production requirements of high-end lithium batteries.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gas-liquid separation for EC pneumatic line to make the addition of fluidflowmeter accurate measurement EC solvent, and then improve the quality of lithium cell electrolyte product.

In order to solve the technical problem, the utility model discloses a technical scheme be: a gas-liquid separation device for an EC pneumatic conveying pipeline comprises an EC conveying pipe distributed along the horizontal direction, a gas-liquid separation pipe vertically and fixedly connected to the middle upper edge of the EC conveying pipe along the vertical direction, and a buffer tank connected to the upper end of the gas-liquid separation pipe; a first switch valve and a second switch valve are respectively arranged at two ends of the EC conveying pipe, wherein the first switch valve is used for connecting with a discharging pipe of an EC pure product tank with pneumatic conveying equipment, and the second switch valve is used for connecting with a feeding pipe of an electrolyte blending kettle with a liquid flowmeter; the lower end of the gas-liquid separation pipe is fixed at the position of a strip-shaped hole formed in the EC conveying pipe in a welding mode, and one side, facing the first switch valve, of the lower end of the gas-liquid separation pipe is arc-shaped, so that a gas guide section for guiding gas in the EC conveying pipe towards the direction of the buffer tank is formed; the buffer tank is provided with an interlayer, the lower part of an inner layer inner cavity of the buffer tank is communicated with the upper end of the gas-liquid separation pipe, the upper part of the inner layer inner cavity is connected with the vacuum pump through the exhaust pipe, and the upper part and the lower part of two sides of the interlayer inner cavity of the buffer tank are respectively connected with a water bath port pipe and a water bath discharge pipe.

Preferably, a sight glass for observing the inner cavity of the buffer tank is provided on the peripheral wall of the buffer tank.

Preferably, the EC transfer pipe and the gas-liquid separation pipe are each coated with a heat insulating material on the outer periphery thereof.

Preferably, the first switch valve and the second switch valve are provided with butt flanges on two sides.

Preferably, the EC conveying pipe, the gas-liquid separation pipe and the buffer tank are all made of stainless steel materials.

Advantageous effects

The utility model discloses assemble the conveying line between EC pure product jar and allotment cauldron to be located fluidflowmeter's the place ahead, be exclusively used in with the measuring of rethread fluidflowmeter behind the nitrogen gas bubble discharge in the EC solvent in the conveying line. In the preparation of the electrolyte raw material, the EC solvent can be accurately added according to the requirements of design components, so that the consistency among products in each batch is improved, the superiority and the first operation of the original component formula can be exerted, and the produced electrolyte product meets the production requirements of high-end lithium batteries.

The utility model discloses including a gas-liquid separation pipe, its lower extreme is connected at the last back of following of EC conveyer pipe, because density between nitrogen gas bubble and the EC solvent differs great, so the bubble of come-up in EC solvent top position is when the gas-liquid separation pipe position, can get into the gas-liquid separation pipe automatically under the buoyancy and be taken out by the vacuum pump through the buffer tank, and gas-liquid separation pipe lower extreme still sets up the air guide section into horn mouth form towards one side of EC pure product jar, is favorable to the cambered surface come-up of bubble edge air guide section to discharge more, makes the utility model discloses a gas-liquid separation simple structure easily realizes that separation efficiency is high.

Drawings

Fig. 1 is a schematic sectional structure of the present invention;

the labels in the figure are: 1. the device comprises a water bath discharge pipe, 2, a buffer tank, 3, an exhaust pipe, 4, a water bath interface tube, 5, a gas-liquid separation pipe, 501, an air guide section, 6, an EC conveying pipe, 601, a strip-shaped hole, 7, a first switch valve, 8 and a second switch valve.

Detailed Description

As shown in fig. 1, the gas-liquid separation device for an EC pneumatic conveying pipeline of the present invention mainly comprises an EC conveying pipe 6, a gas-liquid separation pipe 5 and a buffer tank 2 made of stainless steel. Because the melting point of the EC solvent is higher, in order to avoid the EC solvent from being solidified in the process of conveying or gas-liquid separation, heat insulating materials are respectively coated on the peripheries of the EC conveying pipe 6 and the enterprise separating pipe.

The EC conveying pipe 6 is distributed along the horizontal direction, a first switch valve 7 and a second switch valve 8 are respectively connected to the left end and the right end of the EC conveying pipe 6 through butt flanges, the first switch valve 7 can be connected with an EC pure product tank with a hydraulic conveying device through the butt flange on the left side of the first switch valve, and the second switch valve 8 can be connected with a preparation tank for producing electrolyte through the butt flange on the right side of the second switch valve. After the liquid flow meter is installed on a conveying pipeline between the second switch valve 8 and a feed inlet of the blending tank, the EC solvent with nitrogen bubbles in the EC conveying pipe 6, which is positioned at the left side part of the gas-liquid separation pipe 5 and the buffer tank 2, is fully filled into the EC conveying pipe 6 at one end on the right side of the gas-liquid separation pipe 5 and the buffer tank 2 and a pipeline which is subsequently connected to the blending tank after the bubbles are discharged through the gas-liquid separation pipe 5 and the buffer tank 2, so that the EC solvent introduced into the blending tank can be accurately metered by the liquid flow meter.

The upper edge position in the middle of the EC conveying pipe 6 is provided with strip-shaped holes 601 distributed along the length direction, the gas-liquid separation pipe 5 is distributed along the vertical direction, and the lower end of the gas-liquid separation pipe is welded and fixed on the pipe wall of the EC conveying pipe 6 corresponding to the outer edges of the strip-shaped holes 601. As shown in fig. 1, the upper main body of the gas-liquid separation pipe 5 is a cylindrical circular pipe, the upper main body is distributed toward the right end of the strip-shaped hole 601, an arc-shaped section bent toward the left end of the strip-shaped hole 601 is arranged on the left side of the gas-liquid separation pipe 5, and a bell-mouth-shaped gas guide section 501 is formed on the left side of the lower end of the gas-liquid separation pipe 5 through the arc-shaped section, so that bubbles in the EC solvent flowing through the gas guide section 501 in the EC conveying pipe 6 can be more smoothly discharged upwards into the gas-liquid separation pipe 5 under the action of the arc-shaped gas guide section.

The buffer tank 2 is provided with an interlayer, the lower part of the inner layer inner cavity of the buffer tank 2 is communicated with the upper end of a gas-liquid separation pipe 5, the upper part of the inner layer inner cavity is connected with a vacuum pump through an exhaust pipe 3, and the upper part and the lower part of the two sides of the interlayer inner cavity of the buffer tank 2 are respectively connected with a water bath port pipe 4 and a water bath exhaust pipe 1.

The utility model discloses in concrete application, at air conveying's initial stage, under the more condition of nitrogen gas bubble that contains in the EC solvent, open first ooff valve 7 completely, second ooff valve 8 is opened to about three fourths, thereby form the flow difference between first ooff valve 7 and second ooff valve 8, make EC solvent fill the EC conveyer pipe 6 that is located gas-liquid separation pipe 5 right side, and make partial EC solvent pass through gas-liquid separation pipe 5 and get into in the inlayer inner chamber of buffer tank 2, maintain the dimension of inlayer inner chamber at about 40 degrees centigrade through the water bath, avoid the EC solvent in buffer tank 2 to solidify. Meanwhile, bubbles in the EC solvent rise into the inner cavity of the buffer tank 2 along the air guide section 501 under the action of self-buoyancy, and are discharged under the action of the vacuum pump. After the pneumatic transmission is gradually stabilized, the amount of bubbles escaping from the EC solvent is reduced by visual observation through the sight glass arranged on the circumferential wall of the buffer tank 2, and then the second switch valve 8 can be fully opened to stabilize the liquid level height of the EC solvent in the buffer tank 2. At this time, a small amount of air bubbles contained in the EC solvent in the EC transport pipe 6 located on the left side of the gas-liquid separation pipe 5 still enter the buffer tank 2 through the gas-liquid separation pipe 5, escape from the EC solvent liquid surface in the buffer tank 2, and are discharged by the vacuum pump, and the EC transport pipe 6 located on the right side of the gas-liquid separation pipe 5 is always kept in a state of being filled with the EC solvent.

Claims (5)

1. A gas-liquid separation device for EC pneumatic conveying pipeline, which is characterized in that: comprises an EC conveying pipe (6) which is distributed along the horizontal direction, a gas-liquid separation pipe (5) which is vertically and fixedly connected with the upper edge of the middle part of the EC conveying pipe (6) along the vertical direction, and a buffer tank (2) which is connected with the upper end of the gas-liquid separation pipe (5); a first switch valve (7) and a second switch valve (8) are respectively arranged at two ends of the EC conveying pipe (6), wherein the first switch valve (7) is used for being connected with a discharging pipe of an EC pure product tank with pneumatic conveying equipment, and the second switch valve (8) is used for being connected with a feeding pipe of an electrolyte blending kettle with a liquid flow meter; the lower end of the gas-liquid separation pipe (5) is fixed at the position of a strip-shaped hole (601) formed in the EC conveying pipe (6) in a welding mode, and one side, facing the first switch valve (7), of the lower end of the gas-liquid separation pipe (5) is arranged in a circular arc shape to form a gas guide section (501) used for guiding gas in the EC conveying pipe (6) towards the direction of the buffer tank (2); the buffer tank (2) is provided with an interlayer, the lower part of an inner layer inner cavity of the buffer tank (2) is communicated with the upper end of the gas-liquid separation pipe (5), the upper part of the inner layer inner cavity is connected with the vacuum pump through the exhaust pipe (3), and the upper position and the lower position of the two sides of the interlayer inner cavity of the buffer tank (2) are respectively connected with the water bath port pipe (4) and the water bath port exhaust pipe (1).

2. The gas-liquid separation device for the EC pneumatic conveying pipeline according to claim 1, characterized in that: the peripheral wall of the buffer tank (2) is provided with a sight glass for observing the inner cavity of the buffer tank (2).

3. The gas-liquid separation device for the EC pneumatic conveying pipeline according to claim 1, characterized in that: the periphery of the EC conveying pipe (6) and the gas-liquid separation pipe (5) are coated with heat insulation materials.

4. The gas-liquid separation device for the EC pneumatic conveying pipeline according to claim 1, characterized in that: and abutting flanges are arranged on two sides of the first switch valve (7) and the second switch valve (8).

5. The gas-liquid separation device for the EC pneumatic conveying pipeline according to claim 1, characterized in that: the EC conveying pipe (6), the gas-liquid separation pipe (5) and the buffer tank (2) are all made of stainless steel materials.

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