CN217593874U

CN217593874U - Strip tower for overflow weir

Info

Publication number: CN217593874U
Application number: CN202221231112.4U
Authority: CN
Inventors: 顾振川; 周三祖; 温江虎; 卢主枫; 黄晓娟; 余浩铭; 赵丽萍
Original assignee: Gansu Yinguang Juyin Chemical Industry Co Ltd
Current assignee: Gansu Yinguang Juyin Chemical Industry Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-10-18
Anticipated expiration: 2032-05-19

Abstract

The utility model relates to an overflow weir strip tower, its characterized in that: the tower kettle consists of eight layers, each layer is separated by a tower plate (2), adjacent tower plates (2) are communicated by a downcomer (3), and a plurality of baffle plates (5) are arranged on the tower plates (2); a steam bin (8) is arranged at the tower kettle at the lower part of the first layer of tower plates (2), and a steam pipe (10) is arranged on the tower wall of the steam bin (8); a liquid level bin (9) is arranged between the first layer of tower plate (2) and the second layer of tower plate (2), one side of the tower wall of the seventh layer and one side of the tower wall of the eighth layer are respectively provided with a feeding pipe (1), spray pipes (6) for washing floating materials on the tower wall are arranged in the tower kettles of the first layer to the seventh layer, and a drain pipe (11) is arranged at the top of the tower kettle; the top of the downcomer (3) is provided with an overflow weir pipe orifice (4). The dentiform overflow weir crest can adjust the retention time of the slurry on the tower plate, realize the dynamic adjustment of load, reduce the deposition probability of the slurry, greatly improve the operation stability of the stripping tower and solve the problem of material blockage of the stripping tower.

Description

Strip tower for overflow weir

Technical Field

The utility model relates to a thick liquids strip technical field, concretely relates to overflow weir strip tower.

Background

And the overflow weir stripping tower adopts a negative pressure technology, adopts a bottom steam heating mode to transfer heat with the PVC slurry coming in from the top in a reverse mass transfer mode, and recovers the unreacted chloroethylene in the slurry. As the overflow weir of the 15 ten thousand ton stripping tower in the prior art is higher, the slurry has the phenomenon of deposition in the flowing process, blocks a steam channel of a tower plate and causes the condition of tower blockage. And sometimes when the flow of the slurry is low, the flow velocity of the slurry is too low, and the condition of slurry deposition and tower blockage can also occur. The flow can only be driven to 50-60 m/h, and the operation needs to be stopped for cleaning after one month, so that continuous production and dynamic load adjustment cannot be realized.

Disclosure of Invention

The utility model aims at solving the above-mentioned not enough, provide a weir strip tower.

In order to realize the purpose, the utility model adopts the technical proposal that: an overflow weir stripping tower characterized by: the tower kettle consists of eight layers, each layer is separated by tower plates, adjacent tower plates are communicated by a downcomer, and the downcomer is a passage for slurry to flow from the tower plate of the layer to the tower plate of the next layer; a plurality of baffle plates are arranged on the tower plate; a tower kettle at the lower part of the first layer of tower plate is a steam bin, and a steam pipe is arranged on the tower wall of the steam bin; a liquid level bin is arranged between the first layer of tower plate and the second layer of tower plate, one side of the tower wall of the seventh layer and one side of the tower wall of the eighth layer are respectively provided with a feeding pipe, spray pipes for washing floating materials on the tower wall are arranged in the tower kettles of the first layer to the seventh layer, and the spray pipes are annular and horizontally erected below the tower plates; the top of the tower kettle is provided with a drain pipe; the top of the downcomer is provided with an overflow weir pipe orifice which is 300mm higher than the upper-layer tower plate, the pipe orifice at the lower part of the downcomer is 90mm away from the tower plate surface, and the downcomer of the first-layer tower plate has no overflow orifice and directly passes through the steam bin to extend out of the tower to form a discharge pipe; the top of the downcomer is provided with an overflow weir pipe orifice which is 300mm higher than the upper-layer tower plate, and the lower part of the downcomer is 90mm away from the lower-layer tower plate.

The tower plate is provided with six baffle plates, and the baffle plates control a passage for slurry to flow in the tower plate, so that the retention time can be prolonged, the slurry can uniformly contact with steam, and the quality of the slurry is guaranteed to reach the standard.

The mouth of the overflow weir is in a sawtooth shape, the adjacent tooth sides and the tooth tips of the sawtooth shape form an equilateral triangle, and the side length is 70mm.

The column plate is uniformly distributed with small holes for steam to pass through, the small holes are inverted cones, the diameter of each small hole is 1.5mm, and the column plate is made of stainless steel plates.

The utility model has the advantages that: the overflow weir crest of the downcomer is designed into the shape of an equilateral triangle, so that the retention time of slurry on a tower plate can be adjusted, the thickness of a PVC slurry liquid layer is further reduced, dynamic load adjustment is realized, the slurry deposition probability is reduced, the slurry feeding flow can be enlarged to 20-70 m during transportation from 40-60 m during transportation, the stability and adjustability of the operation of the stripping tower are greatly improved, and the problem of material blockage of the stripping tower is solved. The steam consumption can be saved by 0.5t per hour.

Drawings

FIG. 1 is a view of the structure of the present invention;

FIG. 2 is a cross-sectional view of a tray according to the present invention;

FIG. 3 is a longitudinal cross-sectional view of a tray according to the present invention;

FIG. 4 is a diagram of a tray structure of the present invention;

in the figure: 1-feeding pipe, 2-tower plate, 3-down spout, 4-overflow weir pipe mouth, 5-baffle plate, 6-spraying pipe, 7-discharging pipe, 8-steam cabin, 9-liquid cabin, 10-steam pipe, 11-emptying pipe and 12-small hole.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Example 1: as shown in the figure 1 and the figure 2,

the working process is as follows: after entering the tower plate 2 from the feeding pipe 1, the PVC slurry slowly passes through the channel of the baffle plate 5 along with the continuous feeding, flows to the mouth 4 of the overflow weir, gradually rises along with the liquid level, enters the downcomer 3 when meeting the zigzag flow channel of the mouth 4 of the overflow weir, and then enters the next layer of tower plate 2. When the feeding amount is increased, the slurry liquid layer slowly rises and flows out from the flow passage of the overflow weir pipe orifice 4. Steam enters a steam bin 8 from a steam pipe 10, passes through the tower plates 2 with 1.5mm small holes 12 uniformly distributed layer by layer, and then is subjected to reverse mass and heat transfer with PVC slurry on the tower plates 2 to remove residual vinyl chloride in the slurry, and is discharged and recovered from a discharge pipe 11 at the top of the stripping tower.

After the PVC slurry stripping tower feeds, the thickness of the liquid layer is reduced, and the problem that the tower plate is blocked by slurry deposition is solved. Due to the change of load, after the slurry flows out of the zigzag flow channel of the overflow weir crest, the retention time of the slurry is changed at the same time, and the unreacted chloroethylene in the slurry is guaranteed to be removed and reach the standard.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An overflow weir stripping tower characterized by: the tower kettle consists of eight layers, each layer is separated by a tower plate (2), adjacent tower plates (2) are communicated by a downcomer (3), and a plurality of baffle plates (5) are arranged on the tower plates (2); a tower kettle at the lower part of the first layer of tower plate (2) is a steam bin (8), and a steam pipe (10) is arranged on the tower wall of the steam bin (8); a liquid level bin (9) is arranged between the first layer tower plate (2) and the second layer tower plate (2), one side of the tower wall of the seventh layer and one side of the tower wall of the eighth layer are respectively provided with a feeding pipe (1), spray pipes (6) for washing floating materials on the tower wall are arranged in the tower kettles of the first layer to the seventh layer, and the spray pipes (6) are annular and horizontally erected below the tower plates (2); a drain pipe (11) is arranged at the top of the tower kettle; the top of the downcomer (3) is provided with an overflow weir pipe orifice (4), the overflow weir pipe orifice (4) is 300mm higher than the upper layer tower plate (2), the pipe orifice at the lower part of the downcomer (3) is 90mm away from the tower plate surface, and the downcomer (3) of the first layer tower plate (2) has no overflow orifice and directly passes through a steam bin (8) to extend to the outside of the tower to form a discharge pipe (7).

2. A weir stripper as claimed in claim 1 wherein: six baffling plates (5) are arranged on the tower plate (2).

3. A weir stripper as claimed in claim 1, wherein: the mouth (4) of the overflow weir is in a sawtooth shape, and the adjacent tooth sides and the tooth tips of the sawtooth shape form an equilateral triangle.

4. A weir stripper as claimed in claim 1 or 2 wherein: the trays (2) are uniformly distributed with small holes (12) for the passage of steam.