Project Overview: The formaldehyde absorption tower of a synthetic ammonia project for a chemical customer in Pingxiang, Cologne, Shandong has been in operation for nearly seven yearsThe original tower had a diameter of 1600mm, a height of 13m, a design pressure of 0.105MPa, and a design temperature of 80 ℃. The working pressure is 0.03MPa (gauge pressure), the working temperature is 50-80 ℃, and the container category is Class II container. A ring-shaped sprayer is installed at the top of the tower, and the filling section inside the tower is equipped with fillers such as Φ 50mm Raschig rings and Bauer rings. The bottom of the filling section is supported by grid plate packing and has a distribution cone, gas inlet and outlet pipes, circulating absorption liquid inlet and outlet pipes. The formaldehyde gas in the absorption tower flows from bottom to top, and the absorption liquid flows from top to bottom. After gas-liquid reflux, formaldehyde is absorbed. The formaldehyde absorption tower uses fillers such as Raschig rings and Bauer rings with insufficient specific surface area and high resistance, resulting in poor absorption efficiency, high cooling temperature of the circulating liquid, high venting temperature, large air emissions, and certain product losses and environmental pollution; At the same time, after a period of use, ceramic ring fillers are prone to accumulate in local dead corners, which affects the absorption effect and reduces production efficiency.

　　Confirmation of renovation plan:Based on the actual situation of the customer,Our company (Kelong Petrochemical Equipment Packing Co., Ltd., Pingxiang City, Jiangxi Province)Analyze and compare several fillers and their absorption effects, as well as through collaboration with the customer's technical production managerseriousDiscussion,Decided to use corrugated metal sheet packing as the packing material for the absorption tower.The diamond shaped mesh with regular metal corrugated plate packing is covered with liquid film, and the uneven surface enhances the turbulence, mixing, and surface renewal of the liquid film. It has the advantages of low resistance, high flux, strong anti blocking ability, and uniform gas-liquid distribution; It can increase the uniform distribution of liquids and the wetting performance of fillers, thereby improving mass transfer efficiency; The standardized gas-liquid flow path improves the phenomena of channel flow and wall flow, reduces pressure drop, and increases the specific surface area and packing factor, achieving higher mass and heat transfer effects in the same volume; Due to its uniform, regular, and symmetrical structure, the porosity and flux of the metal corrugated packing are increased, and its comprehensive absorption capacity is much larger than other bulk packing materials, making it more suitable for different pressure operating environments.

　　specificimprovement measures：Formaldehyde absorption towerThe supplier and installation manufacturer of the filling material is Pingxiang CologneOn the basis of ensuring that the cross-sectional dimensions of the cylinder are met, the regular packing is divided into blocks so that the packing blocks can be lifted into the tower from the manhole for assembly. In order to ensure the absorption effect of the packing, so that the incoming gas and circulating liquid can pass through the packing layer evenly without deviation, channel flow, and wall flow, the adjacent two trays of packing are installed at a 45 ° cross offset.

　　improveenhancerefineeffect:

After running for a period of time, the improved formaldehyde absorption tower packing eliminated the phenomenon of uneven liquid distribution, increased the spraying area, increased gas-liquid contact, improved the absorption effect, and ensured stable and continuous production.

Pingxiang Cologne has won the recognition and trust of customers with its technology and production strength!

1. Production capacity has been improved. Increased formaldehyde absorption rate.

2. The decrease in packing resistance has extended the system's operating cycle.