CN213253752U

CN213253752U - Chlorine washing tower

Info

Publication number: CN213253752U
Application number: CN202022051638.1U
Authority: CN
Inventors: 常艳琴; 董尚志; 王金峰; 沙剑; 辛丹; 张宇琪; 苏宝龙; 刘成军; 范亚妮; 陈桦
Original assignee: Jinchuan Group Co Ltd
Current assignee: Jinchuan Group Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-05-25
Anticipated expiration: 2030-09-18

Abstract

The application relates to a chlorine washing tower, which comprises a first tower plate (3), a packing layer and a second tower plate (2) which are arranged inside a tower body (1) from bottom to top, and a conveying pump (5) and a cooler (6) which are arranged outside the tower body (1) and are used for realizing circulation of a cooling and drying liquid medium; the tower body (1) is provided with an input port for cooling and drying liquid medium. This application can realize spraying the doublestage of the chlorine that makes progress, gives chlorine fully cooling and drying, and the cyclic utilization of while cooling drying liquid medium (concentrated sulfuric acid usually) can reduce the application amount of sulphuric acid, and then effectively reduces the production of spent acid. The packing layer includes first structured packing layer (9), bulk packing layer (8) and second structured packing layer (7) in this application, effectively increases the void fraction and the specific surface area of whole packing layer, can effectively carry out the deceleration to chlorine, make chlorine and coolant fully contact, further optimize cooling efficiency and drying effect.

Description

Chlorine washing tower

Technical Field

The application relates to the technical field of washing towers, in particular to a chlorine washing tower.

Background

In an ionic membrane caustic soda production system, a chlorine washing tower is used for cooling, dewatering and removing impurities from chlorine, and generally adopts an empty tower structure. Chlorine generated in the ionic membrane electrolysis process enters from a side wall inlet flue gas pipeline at the lower part of the chlorine washing tower, is in countercurrent contact with the spray acid in the packing layer to realize mass transfer and heat transfer, and leaves the tower through a chlorine pipeline at the top of the tower.

The existing washing tower has simple process configuration form and is more generally applied to the ionic membrane caustic soda industry, but the equipment has the following defects along with the increase of production capacity and a chlorine reflux system: the single-layer spraying is adopted, only chlorine directly contacted with a cooling medium can be cooled, the chlorine cannot be effectively cooled, the water content of the chlorine is reduced, the requirement on the performance of a subsequent chlorine cooler is high, and the manufacturing cost and the operating cost of subsequent cooling and drying equipment are increased; there is no obvious chlorine gas speed reduction and contact device in the middle, which affects the cooling efficiency of chlorine gas.

Disclosure of Invention

The technical problem that this application will be solved provides a chlorine gas scrubbing tower that improves chlorine cooling efficiency and optimizes chlorine drying effect.

In order to solve the problems, the application provides a chlorine washing tower, which comprises a first tower plate, a packing layer and a second tower plate which are arranged inside a tower body from bottom to top, and a conveying pump and a cooler which are arranged outside the tower body and are used for realizing circulation of a cooling and drying liquid medium; the conveying pump is communicated with the bottom of the tower body, one end of the cooler is communicated with the conveying pump, and the other end of the cooler is respectively connected to the spraying liquid inlets of the first tower plate and the second tower plate; the first tower plate is arranged above the chlorine inlet, and the tower body is provided with an input port for the cooling and drying liquid medium.

Preferably, the packing layers comprise a first structured packing layer, a bulk packing layer and a second structured packing layer which are arranged from bottom to top.

Preferably, the packing in the first layer of structured packing and the second layer of structured packing is arranged in a uniform geometric pattern in a neatly packed manner.

Preferably, the packing in the bulk packing layer is arranged in a random packing manner.

Compared with the prior art, the method has the following advantages:

1. in this application, the cooling and drying liquid medium of chlorine scrubbing tower during operation 1 bottom of tower body reaches first column plate and second column plate respectively via delivery pump, cooler, realizes that the doublestage of to going up chlorine sprays, gives chlorine fully to cool down and dry, and the cyclic utilization of cooling and drying liquid medium (concentrated sulfuric acid usually) can reduce the application rate of sulphuric acid simultaneously, and then effectively reduces the production of spent acid.

2. Compare the setting of single-deck bulk packing layer in prior art, the packing layer is formed by first regular packing layer, bulk packing layer and the regular packing layer of second in this application, effectively increases the void fraction and the specific surface area of whole packing layer, can effectively carry out the deceleration to chlorine, make chlorine and cooling medium fully contact, further optimize cooling efficiency and drying effect.

3. In the prior art, chlorine coming out of the chlorine washing tower needs to be dried in two stages, and by using the chlorine washing tower, the chlorine water content index can reach the standard without being dried in the following two stages, so that the chlorine water content is reduced to be below 40ppm (the industrial standard is 100 ppm), and the chlorine washing tower has important significance for the safe and stable production of an environment protection and production system.

Drawings

The following describes embodiments of the present application in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a chlorine scrubber according to an embodiment of the present application.

In the figure: 1-tower body, 2-second tower plate, 3-first tower plate, 4-chlorine inlet, 5-delivery pump, 6-cooler, 7-second structured packing layer, 8-bulk packing layer and 9-first structured packing layer.

Detailed Description

Referring to fig. 1, the present embodiment provides a chlorine washing tower, which comprises a first tower plate 3, a packing layer and a second tower plate 2 arranged inside a tower body 1 from bottom to top, and a transfer pump 5 and a cooler 6 arranged outside the tower body 1 for realizing chlorine water circulation.

The conveying pump 5 is communicated with the bottom of the tower body 1, one end of the cooler 6 is communicated with the conveying pump 5, and the other end of the cooler is respectively connected to the spraying liquid inlets of the first tower plate 3 and the second tower plate 2 through pipelines; the first tower plate 3 is arranged above the chlorine inlet 4, and the top of the tower body 1 is provided with an inlet for cooling and drying liquid medium. In practical application, 98% concentrated sulfuric acid is used as the liquid medium for cooling and drying.

The tower plate can realize the spraying of liquid and consists of three parts: the tower plates (the upper surfaces of which are provided with a plurality of holes, are provided with floating valves, bubble caps and the like and can be directly used as gas phase channels), the down-flow pipes (the upper layer liquid flows to the lower layer tower plates through the down-flow pipes and is a main liquid channel), the overflow weirs (comprising an inlet weir and an outlet weir), and one tower plate is arranged in the chlorine washing tower in the prior art and is added to two tower plates in the scheme. It will be appreciated that the construction and implementation of the trays themselves is within the skill of the art.

In this application, the packing layers specifically include a first structured packing layer 9, a bulk packing layer 8, and a second structured packing layer 7, which are provided from bottom to top. The loose packing (CPVC rosette) is also called random packing, i.e. packing randomly piled in the tower, and the regular packing is a packing which is regularly piled and arranged according to a uniform geometric figure in the tower, and is characterized by large specific surface area, small pressure drop, uniform fluid distribution and high mass and heat transfer efficiency.

The working principle is as follows: firstly, a certain amount of 98% concentrated sulfuric acid is conveyed to the bottom of the tower body 1, and before chlorine is conveyed into the tower body 1, the conveying pump 5 and the cooler 6 work to realize the spraying of the first tower plate 3 and the second tower plate 2. Chlorine is conveyed from a chlorine inlet 4 at the bottom of the tower body 1, then passes through the first tower plate 3, the packing layer and the second tower plate 2 from bottom to top and simultaneously contacts with concentrated sulfuric acid in a countercurrent manner to realize mass transfer and heat transfer, and leaves the tower through a chlorine pipeline at the top of the tower.

For the same wave of chlorine from bottom to top, concentrated sulfuric acid sprayed from the first tower plate 3 and the second tower plate 2 contacts with the chlorine to realize mass transfer and heat transfer and then returns to the bottom of the tower body 1, the concentrated sulfuric acid is conveyed back to the chlorine washing tower by the conveying pump 5 and the cooler 6, one path of concentrated sulfuric acid enters the first tower plate 3 to be sprayed after throttling regulation, the chlorine is cooled for the first time and then returns to the bottom of the tower body 1; and the other path enters a second tower plate 2 for spraying after throttling regulation, the chlorine gas is cooled for the second time, concentrated sulfuric acid has a large contact surface with the chlorine gas and a high mass transfer coefficient in a packing layer after gas-liquid phase mass transfer, and the chlorine gas is cooled and cooled again and finally returns to the bottom of the tower body 1. The concentrated sulfuric acid returning to the bottom of the tower body 1 is cooled by a delivery pump 5 and a cooler 6 and then is reused.

The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the structure and the core concept of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A chlorine washing tower is characterized by comprising a first tower plate (3), a packing layer and a second tower plate (2) which are arranged inside a tower body (1) from bottom to top, and a conveying pump (5) and a cooler (6) which are arranged outside the tower body (1) and used for realizing circulation of a cooling and drying liquid medium; the conveying pump (5) is communicated with the bottom of the tower body (1), one end of the cooler (6) is communicated with the conveying pump (5), and the other end of the cooler is respectively connected to spraying liquid inlets of the first tower plate (3) and the second tower plate (2); the first tower plate (3) is arranged above the chlorine gas inlet (4), and the tower body (1) is provided with an input port for the cooling and drying liquid medium.

2. The chlorine gas scrubber according to claim 1, characterized in that the packing layers comprise a first structured packing layer (9), a bulk packing layer (8) and a second structured packing layer (7) arranged from bottom to top.

3. A chlorine scrubber tower as claimed in claim 2, characterized in that the packing in the first layer of structured packing (9) and in the second layer of structured packing (7) is arranged in a uniform geometrical pattern in a neatly packed manner.

4. A chlorine scrubber tower as claimed in claim 2, characterized in that the filling of the bulk filler layer (8) is arranged in a random packing.