Views: 12 Author: China Xicheng Publish Time: 2021-07-01 Origin: China Xicheng
The difference in appearance between the Horizontal wet scrubber and Packed bed scrubber of waste gas treatment equipment: the main difference lies in the appearance, there are two types of vertical and horizontal. There is no difference in exhaust gas treatment efficiency,
The difference in function: the core of the packed tower lies in the packing itself, such as the packed tower used in the waste gas treatment process. The process is to inoculate specific bacteria or microorganisms in the specific packing so that the waste gas passes through the packing layer. It is absorbed or degraded by species and microorganisms to achieve the purpose of purification. Therefore, the number of nozzles in the packed tower is small, and the main purpose is to maintain the humidity and temperature in the tower to meet the metabolic requirements of microorganisms, the size of the tower diameter and the air volume of the exhaust gas treatment , Working conditions (pressure loss), investment related
The core point of the spray tower is spraying, that is, washing. The spray tower is also used in the waste gas treatment process. Its process is to set the spray liquid according to the relevant indicators of the waste gas to be treated (temperature, composition, PH, dust volume, etc.) The type, flow rate and spray frequency. In order to achieve a better spray effect, the number of nozzles is generally more. What needs to be added is that sometimes in order to enhance the spray washing effect, some fillers with a large specific surface area are added to the spray tower, such as hollow polyhedral spheres, fiber bundles and other substances. The essential difference between this and the filler is that the former is In order to increase the contact area between the exhaust gas and the spray liquid, the latter is to provide the basis for the growth of microorganisms. The acid mist exhaust gas is introduced into the purification tower from the air duct, and passes through the packing layer. And reaction, after the acid mist exhaust gas is purified, it is dehydrated and defogged by a defogging plate and then discharged into the atmosphere by a fan.
Working principle of horizontal wet scrubber for exhaust gas treatment equipment
The acid mist exhaust gas is introduced into the purification tower through the air pipe, and passes through the packing layer. The exhaust gas and the sodium hydroxide absorption liquid undergo gas-liquid two-phase full contact absorption and neutralization reaction. After the acid mist exhaust gas is purified, it is dehydrated and defogged by a demister plate. The fan is discharged into the atmosphere. The absorption liquid at the bottom of the tower is pressurized by a water pump and sprayed down at the top of the tower, and then returned to the bottom of the tower for recycling. The purified acid mist exhaust gas meets the emission requirements of the local emission standards of Guangdong Province, which is lower than the national emission standards.
Features of wet scrubber
1. The efficiency of dust removal and desulfurization is high. When alkaline washing water is used, the desulfurization efficiency can reach 85%;
2. The equipment occupies a small area and is easy to install;
3. Low water and power consumption indicators;
4. Corrosion resistance, non-wear, long service life;
5. The equipment runs reliably, and the maintenance is simple and convenient.
Structure of horizontal wet scrubber
The packing layer in the wet scrubber is used as a mass transfer device for the contact components between the gas and liquid phases. The bottom of the packing tower is equipped with packing support plates, and the packing is placed on the support plates in a random pile. A packing pressure plate is installed above the packing to prevent it from being blown by the rising airflow. The spray tower spray liquid is sprayed onto the packing from the top of the tower through the liquid distributor, and flows down the surface of the packing. The gas is fed in from the bottom of the tower, and after being distributed by the gas distribution device, it continuously passes through the gaps in the packing layer in countercurrent with the liquid. On the surface of the packing, the gas and liquid two phases are in close contact for mass transfer.
When the liquid flows down the packing layer, wall flow phenomenon sometimes occurs. The wall flow effect causes uneven distribution of the gas and liquid phases in the packing layer, thereby reducing the mass transfer efficiency. Therefore, the packing layer in the horizontal wet scrubber is divided into two sections, with a redistribution device in the middle, which is sprayed onto the lower packing after redistribution.