Acid mist purification tower, also known as: acid gas purification tower, acid mist purification tower, acid mist
Absorption Tower, waste gas purification tower, and fiberglass acid mist purification tower. As an important waste gas treatment equipment, acid mist purification tower is already essential in industrial production. The following introduces the basic knowledge of acid mist absorption tower, mainly including its working principle, structural composition, and pH value.
Working principle of acid mist absorption tower
The acid mist absorption tower uses sodium hydroxide alkali solution to neutralize the hydrochloric acid mist. After the gas outside the tower body enters the tower body, it enters the packing layer through the perforated plate. There is spray liquid (sodium hydroxide solution) from the nozzle distribution on the packing layer, and a layer of liquid film is formed on the packing. When the gas flows through the packing gap, it contacts with the packing liquid film for absorption or neutralization reaction, and the gas continues to walk upward, After several absorption or neutralization, the gas is collected by the mist eliminator and discharged outside the tower through the air outlet. After treatment, the discharge amount of hydrochloric acid mist is 0.0069t/a (0.00144kg/h), and the emission concentration is 0.288mg/m3, which can meet the secondary standard in the "Comprehensive Emission Standard for Air Pollutants" (GB16297-1996). The measures taken are reasonable and feasible.
Workflow:
1. After being compressed, the raw gas enters the
Condenser for cooling to around 50 ° C, and then enters the absorption tower for spray washing;
2. The washed gas passes through a degreasing filter to remove oil and impurities;
3. Then, after being pressurized by a fan, it is sent to a dryer for heating and dehydration to form dry gas (at a temperature of 100 ° C), and then sent to an absorbent storage tank for uniform mixing;
4. The evenly mixed liquid is pumped to the spraying device to form a liquid film and flows down the surface of the packing layer;
5. The organic matter in the liquid is adsorbed by activated carbon and removed;
6. The acid gas after desorption is neutralized with sodium hydroxide aqueous solution in the alkali washing section to a ph value of 7~9 (i.e. alkaline) and discharged out of the system.
What is the appropriate pH value to control for the acid mist absorption tower?
When the pH value is 7 to 7.5, it indicates that the purification capacity of the spray tower is good. When the pH value is 7.5, it indicates that the alkali solution in the spray tower is sufficient to neutralize the acidic gas in the tail gas. At this time, record the inspection date and the pH value of the spray solution in the tower.
From a structural perspective, the absorption tower is generally divided into a cylinder, a flue gas inlet, and a flue gas outlet. Generally, the flue gas inlet is arranged in the middle of the absorption tower, and the flue gas outlet is arranged at the top of the absorption tower. From the perspective of functional zoning, the absorption tower cylinder can be divided into a slurry tank area, a spray area, and a demister area: the slurry tank area is generally located at the lower part of the absorption tower inlet, and the spray area and demister are located between the flue gas inlet and outlet. The flue gas outlet of the absorption tower can be of the top straight out type or the horizontal side out type.
The conventional spray area is equipped with spray layers and nozzles, and depending on the desulfurization process, some absorption towers also have trays, Venturi bars, and other devices in the spray area.
Source: Xianji Network
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