CN106422677A - Novel formaldehyde spray type absorption tower - Google Patents

Abstract

The invention provides a novel formaldehyde spray absorption tower, which includes a tank body (1), a formaldehyde absorption liquid input port (2) is provided at the top of the tank body (1), and a formaldehyde absorber is provided at the bottom end of the tank body (1). The absorption liquid recovery port (3), the input port (2) and the recovery port (3) are connected through the circulation pipe (5), and the pump body (4) is arranged on the circulation pipe (5); One side of the body (1) is provided with a formaldehyde process gas inlet (6); a group of fillers (9) are arranged at intervals in the tank body (1), and the feature is that: on the other side of the tank body (1) A group of formaldehyde absorbing liquid inlets (7) are also provided, and the formaldehyde absorbing liquid inlets (7) are connected to the circulation pipe (5) through pipes. The invention has a simple structure, is convenient for modification on existing equipment, and can effectively increase output and reduce consumption.

Description

A new formaldehyde spray absorption tower

Technical field:

The invention relates to a formaldehyde production equipment, in particular to a novel formaldehyde spray absorption tower.

Background technique:

At present, the formaldehyde production process is relatively mature. The key process of formaldehyde production is oxidation and absorption. If these two processes are well controlled, the entire production process will be stable.

In general, pressure is an important factor affecting gas-liquid absorption. However, in the production and absorption of formaldehyde, since formaldehyde has a high solubility in water, as long as the absorption temperature is not high, the absorption can be completed under normal pressure, so no high pressure is required. Formaldehyde is easily soluble in water. In actual production, the formaldehyde absorption tower uses water to absorb formaldehyde to generate gas, and the absorption effect of the absorption tower directly affects the content and consumption of formaldehyde. Generally speaking, the absorption tower used in the production of formaldehyde adopts a three-stage packed tower structure and uses the absorption liquid circulation method to absorb formaldehyde gas. Generally speaking, the spray density of the packed tower should be controlled around 40m3/m2·h. If it is too small or too large, it will reduce the absorption efficiency and increase unnecessary power consumption, resulting in substandard formaldehyde production and increased power consumption.

Invention content:

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a new type formaldehyde spray absorption tower with simple structure, convenient use, convenient for direct transformation on existing equipment, and capable of effectively increasing output and reducing consumption.

The invention provides the following technical solutions:

A new type formaldehyde spray absorption tower, which includes a tank body, an input port for formaldehyde absorption liquid is provided at the top of the tank body, and a recovery port for formaldehyde absorption liquid is provided at the bottom end of the tank body, between the input port and the recovery port It is communicated through the circulation pipeline, and a pump body is provided on the circulation pipeline; a formaldehyde process gas inlet is provided on one side of the tank body; a group of packing is also arranged at intervals in the tank body, and the characteristic is that: on the other side of the tank body There is also a group of formaldehyde absorbing liquid inlets on the side, and the formaldehyde absorbing liquid inlets are connected with the circulation pipe through pipes.

On the basis of above-mentioned technical scheme, also can have following further technical scheme:

The group of formaldehyde absorbing liquid inlets corresponds to the group of fillers, and they are all located at the bottom of the fillers.

Each formaldehyde absorbing liquid inlet located inside the tank body is connected with a spray corresponding to the cross section of the tank body.

There are flow control valves on each pipe.

The advantages of the present invention are:

The invention has the advantages of simple structure, convenient use, convenient modification on existing equipment, low modification cost and the like. In particular, the spraying is set under the filler. Because of its relatively stable spray volume, part of the absorber filler can be removed, the resistance of the absorber can be reduced, the spray density can be increased, the absorption effect can be increased, the formaldehyde output can be increased, and the product unit consumption can be reduced.

Description of drawings:

Fig. 1 is a structural schematic diagram of the present invention.

detailed description:

As shown in Figure 1, a new type of formaldehyde spray absorption tower, it includes a tank body 1, a formaldehyde absorption liquid input port 2 is provided at the top of the tank body 1, and a formaldehyde absorption liquid recovery port 3 is provided at the bottom end of the tank body 1 , between the input port 2 and the recovery port 3 are communicated through a circulation pipe 5, and a formaldehyde absorption liquid injection port 5a is also provided on the circulation pipe 5, and a pump body 4 is provided on the circulation pipe 5.

The formaldehyde absorption liquid enters the circulation pipeline 5 from the formaldehyde absorption liquid injection port 5a, enters the tank body 1 from the input port 2, and then flows back to the circulation pipeline 5 from the recovery port 3 at the bottom of the tank body 1, and under the action of the pump body 4 , and then enter the tank 1 from the input port 2, thus forming a circulation loop. A finished formaldehyde outlet 5b is also provided on the circulation pipe 5 on one side of the pump body 4 .

A formaldehyde process gas inlet 6 is provided on one side of the tank body 1 . So that the formaldehyde process gas enters the tank body 1 for reaction.

In the tank body 1 there is also a set of fillers 9 distributed in sections at intervals, each section of fillers 9 corresponds to the cross-sectional direction of the tank body 1 , and there is a certain distance between each section of fillers 9 .

On the other side of the tank body 1 is also provided with a group of formaldehyde absorbing liquid inlets 7, each of the formaldehyde absorbing liquid inlets 7 is connected to the circulation pipe 5 through a pipe 8, and each pipe 8 is provided with a flow control Valve 8a.

The group of formaldehyde absorbing liquid inlets 7 corresponds to the group of fillers 9 , and each formaldehyde absorbing liquid inlet 7 is located at the bottom of the filler 9 . A stainless steel circular spray 10 corresponding to the cross section of the tank body 1 is communicated with each formaldehyde absorbing liquid inlet 7 located inside the tank body 1 .

Through the flow control valve 8a, the flow rate of the formaldehyde absorption liquid in the pipeline 8 can be controlled, and the spray density can be maintained at 40m3/m2 h, so as to avoid channeling caused by too small or too large spray density, and can also be controlled by controlling the flow rate. , to control the absorption concentration of the formaldehyde absorption solution for each section of filler 9, so that it is maintained at about 37%.

Due to the addition of spraying in the present invention, the formaldehyde absorbing liquid can be evenly sprayed onto the filler below the spraying through spraying, which changes the single "flooding" formaldehyde absorbing liquid input mode in the prior art. It makes the absorption of the formaldehyde absorption liquid by each section of packing in the tank more uniform, so the height of the packing of the absorption tower can be appropriately reduced, thereby reducing the resistance of the absorption tower and reducing the resistance of the system. At the same time, the stability and smoothness of formaldehyde production are improved, the output is increased, and the consumption is reduced.

Claims (4)

1. a kind of novel methylene spray absorption tower, it includes tank body（1）, in tank body（1）Top is provided with formaldehyde absorbent input Mouthful（2）, in tank body（1）Bottom is provided with formaldehyde absorbent recovery port（3）, described input port（2）With recovery port（3）Between pass through Circulating line（5）Connection, and in circulating line（5）It is provided with the pump housing（4）；In tank body（1）On side be provided with formaldehyde process gas Import（6）；In tank body（1）Inside also it is interval with one group of filler（9）It is characterised in that：In tank body（1）On opposite side be additionally provided with One group of formaldehyde absorbent import（7）, described formaldehyde absorbent import（7）By pipeline（8）With circulating line（5）It is connected.

2. a kind of novel methylene spray absorption tower according to claim 1 it is characterised in that：One group of described formaldehyde Absorbing liquid import（7）With one group of described filler（9）Corresponding, it is respectively positioned on filler（9）Bottom.

3. a kind of novel methylene spray absorption tower according to claim 1 it is characterised in that：Positioned at tank body（1） Each formaldehyde absorbent import of inner side（7）On be all communicated with one and tank body（1）The corresponding spray in cross section（10）.

4. a kind of novel methylene spray absorption tower according to claim 1 it is characterised in that：In every pipeline（8） On be equipped with flow control valve（8a）.