Powder removing structure of washing tower

Abstract

The utility model provides a powder removing structure of a washing tower, which relates to the field of polyolefin material equipment and comprises a washing tower kettle, a liquid collecting hopper used for dividing an inner cavity of the tower kettle into an upper cavity and a lower cavity is arranged in the tower kettle, a tail gas inlet is arranged on one side of the upper cavity, and a liquid outlet is arranged at the bottom of the lower cavity; the bottom of the liquid collecting hopper is communicated with a downcomer for guiding liquid in the liquid collecting hopper into the lower cavity, and the bottom of the tower kettle is provided with an impingement plate positioned between the outlet end of the downcomer and the liquid outlet; and a liquid phase narrowing mechanism which is positioned below the liquid collecting hopper and is used for collecting and discharging dust is also arranged in the lower cavity. Compared with the prior art, the dust removal structure of the washing tower adopts the liquid collecting hopper to divide the inner cavity of the tower kettle into the upper cavity and the lower cavity, the downcomer discharges tail gas mixed with washing water into the lower cavity for settling separation, and polyethylene dust on the liquid level in the lower cavity is gathered in the flow guide channel and is discharged from the overflow liquid discharge pipe under the action of the overflow plate; the whole dust removal structure is simple in structure, stable and reliable, and dust collected by the washing tower can be effectively discharged.

Description

Technical Field

[0001] The utility model relates to the field of polyolefin material equipment, in particular to a powder removal structure of a washing tower. Background Art

[0002] Polyolefins have the characteristics of low relative density, good chemical and water resistance, good mechanical strength, and electrical insulation. They can be used for films, pipes, plates, various molded products, wires and cables, etc. They are widely used in agriculture, packaging, electronics, electrical appliances, automobiles, machinery, and daily sundries.

[0003] After the polyolefin powder is mixed with water, it will float above the water surface and cannot be discharged from the bottom of the tower with the washing water through the bottom circulation pump. The existing tail gas washing tower sets an overflow port at an appropriate position on the side wall of the bottom of the tower, so that the powder floating on the water surface can be discharged from the washing tower from the overflow port along with the water flow. However, due to the hydrophobicity of the polyolefin powder and the surface tension between the powder particles, under low flow rate conditions, the powder floating on the water surface will agglomerate together and cannot be smoothly discharged from the washing tower from the overflow pipe along with the water flow. The powder continues to accumulate at the bottom of the washing tower, causing the overflow pipe to be blocked, and even causing a tower flooding accident in severe cases. Utility Model Content

[0004] In view of the above problems, the utility model provides a washing tower powder removal structure, which is applied to the bottom of the tail gas washing tower of a polyolefin dryer. It has a simple structure, is stable and reliable, and can effectively discharge the dust collected by the washing tower.

[0005] The technical solution adopted by the utility model is:

[0006] A powder removal structure of a washing tower comprises a washing tower kettle, wherein a liquid collecting hopper is provided in the kettle for dividing the inner cavity of the kettle into an upper cavity and a lower cavity, an exhaust gas inlet is provided on one side of the upper cavity, and a liquid discharge port is provided at the bottom of the lower cavity; a downcomer is connected at the bottom of the liquid collecting hopper for introducing the liquid in the liquid collecting hopper into the lower cavity, and an anti-collision plate is provided at the bottom of the kettle between the outlet end of the downcomer and the liquid discharge port; a liquid phase narrowing mechanism is also provided in the lower cavity and is located below the liquid collecting hopper for collecting dust and discharging the dust.

[0007] Preferably, the liquid phase narrowing mechanism includes an upper bucket chamber, a lower bucket chamber and a guide channel connecting the upper bucket chamber and the lower bucket chamber. An overflow plate is also provided between the upper bucket chamber and the lower bucket chamber, a guide groove is provided on the overflow plate, and an overflow liquid discharge pipe is provided on one side of the overflow plate.

[0008] More preferably, the upper bucket chamber and the lower bucket chamber are both formed by enclosing baffles; the overflow plate and the adjacent liquid baffle plates enclose an overflow trough, an overflow liquid discharge hole is opened at the bottom of the overflow trough, the overflow liquid discharge hole is connected to the overflow liquid discharge pipe, and the overflow plate is located at the guide channel.

[0009] More preferably, the guide groove is in an inverted trapezoidal shape.

[0010] Preferably, a plurality of overflow ports are provided on the side wall of the lower chamber, and the liquid surface formed by the overflow ports is located in the guide channel.

[0011] Preferably, at least one communication port is provided on the side walls of the upper cavity and the lower cavity, and the two corresponding communication ports are connected through a communication pipe.

[0012] More preferably, the side wall of the liquid collecting hopper is inclined and connected to the inner wall of the tower kettle, and a liquid outlet hole connected to the downcomer is provided at the lowest position in the liquid collecting hopper.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model provides a powder removal structure for a washing tower, which adopts a liquid collecting bucket to divide the inner cavity of the tower kettle into an upper cavity and a lower cavity, and the downcomer discharges the exhaust gas mixed with washing water into the lower cavity for sedimentation and separation, and the polyethylene dust on the liquid surface in the lower cavity is gathered in the guide channel formed by the liquid phase narrowing mechanism, and is discharged from the overflow liquid discharge pipe under the action of the overflow plate; the entire powder removal structure is simple in structure, stable and reliable, and can effectively discharge the dust collected by the washing tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 , is an internal schematic diagram of a powder removal structure of a washing tower provided by the utility model;

[0015] Figure 2 , is a cross-sectional schematic diagram of an overflow plate in a powder removal structure of a washing tower provided by the utility model;

[0016] Figure 3 , which is a schematic axial cross-sectional view below a liquid collecting bucket in a powder removal structure of a washing tower provided by the utility model. DETAILED DESCRIPTION

[0017] The preferred implementation modes provided by the utility model are described in detail according to the accompanying drawings.

[0018] Figures 1 to 3 , which is a preferred embodiment of a washing tower powder removal structure provided by the utility model. Figures 1 to 3As shown, the powder removal structure of the washing tower comprises a washing tower kettle 10, in which a liquid collecting hopper 20 is provided for dividing the inner cavity of the kettle into an upper cavity 101 and a lower cavity 102, a tail gas inlet 11 is provided on one side of the upper cavity, and a liquid discharge port 12 is provided at the bottom of the lower cavity; the bottom of the liquid collecting hopper 20 is connected with a downcomer 30 for introducing the liquid in the liquid collecting hopper into the lower cavity, and a bumper plate 40 is provided at the bottom of the kettle between the outlet end of the downcomer and the liquid discharge port; the lower cavity is also provided with a liquid phase narrowing mechanism 50 for collecting and discharging dust below the liquid collecting hopper, so that the inner cavity of the kettle is divided into an upper cavity 101 and a lower cavity 102 by using the liquid collecting hopper 20, the downcomer 30 discharges the dust-containing washing water after contacting with the tail gas into the lower cavity 102 for sedimentation and separation, and the polyethylene dust on the liquid surface in the lower cavity 102 gathers in the liquid phase narrowing structure 50 for discharge; the whole powder removal structure is simple in structure, stable and reliable, and can effectively discharge the dust collected by the washing tower.

[0019] The side wall of the liquid collecting hopper 20 is inclined and connected to the inner wall of the tower kettle. A liquid outlet hole connected to a downcomer is provided at the lowest position in the liquid collecting hopper 20. The liquid phases of the upper chamber 101 and the lower chamber 102 are connected through the downcomer 30. The diameter of the downcomer is determined according to the circulation volume of the washing liquid so that the liquid flow rate in the downcomer is maintained within an appropriate range to avoid stratification due to liquid accumulation on the liquid collecting hopper.

[0020] The anti-collision plate 40 is arranged at the bottom of the washing tower, and is located between the downcomer 30 and the drain port 12 at the bottom of the tower. The anti-collision plate 40 is a vertical baffle, which divides the lower chamber of the tower kettle into two parts, so that the downcomer 30 and the drain port 12 are respectively located on both sides of the anti-collision plate 40; the function of the anti-collision plate 40 is to prevent the bubbles entrained by the downcomer 30 from being directly sucked into the water pump through the drain port 12 to cause cavitation.

[0021] At least one communication port 103 is provided on the side wall of the upper chamber 101 and the lower chamber 102, and the two corresponding communication ports are connected through a communication pipe. The communication port 103 and the pipe are used to connect the gas phase space of the upper chamber 101 and the lower chamber 102, so that the pressure of the upper chamber 101 and the lower chamber 102 is balanced, which is conducive to the washing liquid on the liquid collecting bucket to be discharged into the lower chamber 102 through the downcomer 30. It is worth noting that the diameter of the communication port 103 and its connecting pipeline is small, and can only play the role of balancing the pressure of the upper chamber 101 and the lower chamber 102. Only a small amount of tail gas in the upper chamber 101 can enter the lower chamber through this pipeline; the number and form of the communication port 103 and the pipeline are not limited to those shown in this example, and this function can also be achieved through other pipelines or internal channels of the equipment of the washing tower.

[0022] like Figure 2 and Figure 3As shown, the liquid phase narrowing mechanism 50 includes an upper bucket chamber 51, a lower bucket chamber 52, and a guide channel 53 connecting the upper bucket chamber and the lower bucket chamber. An overflow plate 54 is also provided between the upper bucket chamber 51 and the lower bucket chamber 52. A guide groove 541 is provided on the overflow plate 54. An overflow liquid discharge pipe 55 is provided on one side of the overflow plate. The dust and liquid in the lower chamber 102 enter the liquid surface of the guide channel 53 between the upper bucket chamber 51 and the lower bucket chamber 52. Under the action of the overflow plate 54, the dust and liquid finally flow through the guide groove 541 on the top of the overflow plate 54 and flow into the overflow liquid discharge pipe 55 to be discharged from the washing tower. The guide groove 541 is in an inverted trapezoidal shape.

[0023] The upper bucket chamber 51 and the lower bucket chamber 52 in the liquid phase narrowing mechanism 50 are formed by enclosing baffles, and the entire shape is a gourd-like shape that is wide at the top and bottom and narrow in the middle. The overflow plate 54 and the adjacent liquid baffle plates enclose an overflow groove 56, and an overflow liquid discharge hole is opened at the bottom of the overflow groove 56. The overflow liquid discharge hole is connected to the overflow liquid discharge pipe 55. The overflow plate 54 is located at the guide channel 53. The liquid and dust entering the guide channel 53 flow into the overflow groove 56 through the guide groove 541 on the top of the overflow plate 54, and then discharged from the overflow liquid discharge pipe 55.

[0024] The side wall of the lower chamber is provided with a plurality of overflow ports, and the liquid surface formed by the overflow ports is in the guide channel, and the dust and liquid in the lower chamber 102 enter the guide channel 53 between the upper bucket chamber 51 and the lower bucket chamber 52, and can be discharged from the overflow ports, and the liquid surface is formed from the overflow ports, and the liquid surface height is controlled in the guide channel formed by the liquid phase narrowing mechanism 50. The form and number of the overflow ports are not limited to the figure, but are all for the purpose of controlling the liquid surface height and increasing the liquid speed.

[0025] The following is an example of a dry gas washing tower for a polyethylene project: during operation, polyethylene dry tail gas enters the washing tower from the tail gas inlet 11 of the washing tower, and the main medium of the dry tail gas is high-temperature and high-humidity nitrogen with a small amount of polyethylene dust; after the tail gas is directly contacted with the washing water in the washing tower for heat exchange and cooling, the washing water with polyethylene dust falls into the liquid collecting bucket 20, and the liquid collecting bucket 20 separates the washing tower into an upper chamber 101 and a lower chamber 102. The dust-containing washing water that has contacted with the tail gas is collected by the liquid collecting bucket 20 and then enters the lower chamber 102 through the downcomer 30. The liquid collecting bucket 20, the downcomer 30 and the washing tower are connected to each other. The washing tower and the tower kettle together form a liquid seal structure, which isolates the dry tail gas in the cavity above the liquid collecting bucket 20, and prevents the unwashed dry tail gas from being directly discharged from the washing tower through the overflow pipe; gas phase communication ports 4 are set at appropriate positions on the tower inner walls on the upper and lower sides of the liquid collecting bucket and connected through pipelines, so that the pressure of the upper cavity 101 and the lower cavity 102 separated by the liquid collecting bucket 20 is balanced, and further the liquid in the liquid collecting bucket flows quickly into the lower cavity through the downcomer 30; the washing water entering the lower cavity 102 through the downcomer 30 has a slower flow rate after entering the tower kettle, and the bubbles and polyethylene dust entrained in the washing water are discharged in the washing water. The liquid phase narrowing mechanism 50 is a gourd-shaped structure that is wide at the top and narrow in the middle. The overflow plate 54 is located in the guide channel 53 formed by the kettle liquid phase narrowing mechanism 50. The upper edge of the overflow plate 54 is provided with an inverted trapezoidal guide groove 541, which is higher than the lower edge of the guide groove 541. The water will flow along the guide groove 541 to the other side of the overflow plate 54, and be discharged from the washing tower through the overflow liquid discharge pipe 55; since the kettle liquid phase narrowing mechanism 50 changes the spatial structure of the tower kettle, the polyethylene dust on the liquid surface in the lower chamber 102 gathers in the guide channel 53 of the kettle liquid phase narrowing mechanism 50, and the washing water increases the flow rate again when flowing out from the guide channel 53 through the guide groove 541, breaking the surface tension between the polyethylene dust on the liquid surface, so that the washing water carries the polyethylene dust to the other side of the guide groove 541, enters the overflow groove 56, and is discharged from the washing tower from the overflow liquid discharge pipe 55.

[0026] In summary, the technical solution of the utility model can fully and effectively achieve the above-mentioned utility model purpose, and the structure and functional principle of the utility model have been fully verified in the embodiments, and can achieve the expected effect and purpose. Without departing from the principle and essence of the utility model, various changes or modifications can be made to the embodiments of the utility model. Therefore, the utility model includes all replacement contents within the scope mentioned in the scope of the patent application, and any equivalent changes made within the scope of the patent application of the utility model are within the scope of the patent application of this case.

Claims

1. A washing tower powder removal structure, comprising a washing tower kettle, characterized in that: A liquid collecting hopper is provided in the tower kettle for dividing the inner cavity of the tower kettle into an upper cavity and a lower cavity. An exhaust gas inlet is provided on one side of the upper cavity, and a liquid discharge port is provided at the bottom of the lower cavity. The bottom of the liquid collecting hopper is connected to a downcomer for introducing the liquid in the liquid collecting hopper into the lower cavity, and an anti-collision plate is provided at the bottom of the tower kettle between the outlet end of the downcomer and the liquid discharge port. The lower cavity is also provided with a liquid phase narrowing mechanism located below the liquid collecting hopper for collecting dust and discharging it.

2. The powder removal structure of the washing tower according to claim 1 is characterized in that: The liquid phase narrowing mechanism includes an upper bucket chamber, a lower bucket chamber and a guide channel connecting the upper bucket chamber and the lower bucket chamber. An overflow plate is also provided between the upper bucket chamber and the lower bucket chamber, a guide groove is provided on the overflow plate, and an overflow liquid discharge pipe is provided on one side of the overflow plate.

3. The powder removal structure of the washing tower according to claim 2 is characterized in that: The upper bucket cavity and the lower bucket cavity are both formed by enclosing baffles; the overflow plate and the adjacent liquid baffle plates enclose an overflow trough, an overflow liquid discharge hole is opened at the bottom of the overflow trough, the overflow liquid discharge hole is connected to the overflow liquid discharge pipe, and the overflow plate is located at the guide channel.

4. The powder removal structure of the washing tower according to claim 2 is characterized in that: The guide groove is in an inverted trapezoidal shape.

5. The powder removal structure of the washing tower according to claim 1 is characterized in that: A plurality of overflow ports are arranged on the side wall of the lower chamber, and the liquid surface formed by the overflow ports is located in the guide channel.

6. The powder removal structure of the washing tower according to claim 1 is characterized in that: At least one communication opening is provided on the side walls of the upper cavity and the lower cavity, and the two corresponding communication openings are connected through a communication pipe.

7. The powder removal structure of the washing tower according to claim 1 is characterized in that: The side wall of the liquid collecting hopper is inclined and connected to the inner wall of the tower kettle. A liquid outlet hole connected to the downcomer is arranged at the lowest position in the liquid collecting hopper.

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