I. Overview

The spray scrubber is carefully designed by our company according to the requirements of gas treatment in various industries. Different fillers and contact time, empty tower speed and gas-liquid ratio are used for different gases. The problems of purification efficiency, operation cost, secondary pollution and area occupied were thoroughly solved, and the technology of spray scrubbing tower was successfully upgraded to a higher level.

II. Scope of application

1. As a wet dust collector in the field of dust removal, it is widely used in paint fog dust removal in spray painting industry. The effect of gas dust removal after liquid painting line purification is obvious.

2. It is widely used to control the pollution of lead dust or vapor in printing, storage battery, non-ferrous metal smelting, military industry and other industries.

3. Purification of acid cleaning waste gas or other waste gas from chemical, smelting, electroplating, kinescope, printing and dyeing, pharmaceutical, instrumentation, electronic instrumentation, mechanical manufacturing and other industries.

III. PROCESS PROCESS

The washing liquid sprays evenly downward through the nozzle, the dust gas enters from the lower part of the spraying tower, and the coating line of the steam drive shaft flows upwards. The two contacts counter-current, using the contact collision between the dust particles and the water droplets to agglomerate or agglomerate the dust particles, which greatly increases their weight and settles down by the action of gravity. Come on. The captured dust is gravitationally settled in the tank and discharged regularly. Partial clarifier can be recycled, and with a small amount of supplementary clarifier, it can be sprayed and washed by circulating pump from the top nozzle of the tower to the spray tower. Thus, the consumption of liquid and the treatment of secondary sewage are reduced. The purified gas after spraying and washing is discharged from the top of the tower after removing the small droplets entrained by the gas through the mist eliminator.

IV. STRUCTURAL CONSTRUCTION

The main factors affecting the dust removal efficiency of spray tower are the uniformity of droplet distribution, droplet size and particle size distribution. Therefore, it is one of the keys to design the spray scrubber to choose the appropriate atomizing nozzle and the reasonable layout of the nozzle.

1. Nozzle Arrangement

The layout of nozzles in spray tower should make the cross section of spray tower completely and evenly covered by spray liquid. Generally, multi-layer nozzles are used, and the nozzles between adjacent layers are staggered. The distance between the two layers is 1-2 M. Each spray layer must be equipped with a sufficient number of nozzles, and the water spray from adjacent nozzles overlaps each other, leaving no gap, so that the spray droplets completely cover the whole section of the spray tower, and to minimize the amount of liquid flowing along the tower wall, while reducing the direct erosion and wear of the spray on the tower wall.

2. Spray coverage

The liquid ejected from the nozzle must be able to completely cover the spray tower section at a certain distance from the nozzle outlet, so as to prevent the short circuit of gas in the spray tower where there is no spray liquid. Generally, the spray coverage of each spray layer should be 200% - 300%. Spray coverage can be calculated by the following formula: spray coverage = Nm*Am/A

In the formula: Nm - the number of nozzles in each spray layer; Am - the spray area of each nozzle measured at 1 m from the nozzle outlet; - A - the cross-sectional area of the spray tower at 1 m from the nozzle outlet,.

3. Droplet size and main design parameters

Choosing the appropriate size of spray droplets is a prerequisite for determining the main design parameters of spray tower. It is well known that under the same spraying conditions, the larger the droplet size, the smaller the specific surface area and the lower the dust removal efficiency. However, the droplet size is too small, easy to be vaporized or carried away by the airflow, which increases the load of the demister, and directly reduces the amount of liquid droplets in spray washing, which will also affect the dust removal efficiency.

V. Technical Characteristics of Equipment

1. New structure: changing the conventional contact mode of gas-liquid two-phase cross flow;

2. Large air handling capacity: 36% larger than sieve tray and valve tray;

3. Low pressure drop: 16% smaller than conventional absorption tower;

4. Purification efficiency: Purification efficiency can be as high as 95%.