How can the alkaline droplets carried in the gas at the top of the absorption tower be removed thoroughly?

Are there screen-type demisters? Electric mist removal can also be tried; it provides excellent mist-removal results – the smoke that was visible becomes practically invisible after passing through the electric mist remover.

Adding a coalescer on top should give good results

This post was last edited by goldliyang on 2017-10-13 08:23. To remove the entrained alkaline droplets from the gas at the top of the absorption tower with a removal efficiency of 99.9%, a gas-liquid separation demister designed using a precise dynamic gas-liquid separation configuration platform can achieve relatively thorough removal. It is essential to emphasize the use of gas-liquid separation demisters that are developed through a platform designed for precise dynamic gas-liquid separation! Because gas-liquid separation itself belongs to kinetic separation technologies. A gas-liquid separation demister obtained through a platform that lacks a precise dynamic gas-liquid separation design configuration will find it difficult to achieve optimal separation results due to hydrodynamic issues such as improper setting of the momentum and kinetic energy thresholds of the flowing fluid, as well as incorrect installation location. Since the liquid droplets entrained in the gas stream contain alkali, they precipitate and accumulate on the surface of the separation demister as the microflow pattern continuously changes. It is recommended to use a dedicated, high-efficiency gas-liquid separator with specialized fins to prevent clogging; foam eliminators that rely on screens, fibers, or filter elements for interception are not suitable, as they offer limited operational flexibility, result in high pressure drops, are prone to clogging, and incur high costs for operation and maintenance. If it is necessary to remove liquid droplets smaller than 1 micron from the gas at the top of the absorption tower, it is recommended to use a specialized feather-plate anti-clogging high-efficiency gas-liquid separator combined with an electrostatic demister. Electrostatic mist eliminators are suitable for removing small amounts of fine liquid droplets from air streams, but their efficiency drops when dealing with a higher concentration of larger droplets; moreover, alkali scale tends to form on the electrodes, making maintenance and cleaning difficult. A reliable, effective, and cost-effective solution is to use a dedicated, anti-clogging high-efficiency gas-liquid separator to remove 99.9% of the alkaline liquid droplets and mist first, followed by an electrostatic demister to eliminate the remaining trace amounts of alkaline liquid droplets and mist, ensuring the economical operation of the electrostatic demister. To ensure that the vent gases released directly into the atmosphere at the top of the tower do not form a \"plume,\" it is necessary to accelerate the exhaust gas that has undergone gas-liquid separation and demisting sufficiently. This allows the vent gas containing saturated water vapor to disperse quickly enough before it comes into contact with the cooler ambient air and condenses, thereby preventing the formation of a \"plume.\" Currently, in China as well, the exhaust gas is heated such that the temperature of the gas stream itself is 90–100°C or even higher than the ambient temperature. As a result, the gas stream exits the equipment pipelines at high speed and spreads rapidly, which also helps to prevent the formation of \"plumes\".