Desulfurization Process Introduction - Lime Stone - Gypsum Flue Gas Desulfurization Process (Part 1)

As industrial development surges, the increasing demand for energy has made sulfur dioxide (SO2) emissions from equipment like boilers a primary driver of atmospheric degradation. With the economy's continuous prosperity and rising standards of material living, energy consumption keeps escalating. Reducing SO2 pollution in flue gases has become an urgent task in atmospheric environmental governance. Many companies have already adopted flue gas desulfurization processes. Current desulfurization technologies are of significant practical importance in treating the exhaust gases from various boilers and incinerators. Here's an introduction to the limestone-based flue gas desulfurization process.

Limestone-gypsum desulfurization technology is one of the most widely used desulfurization methods in the world. In the majority of power plants using coal-fired generation in most countries, over 90% of desulfurization processes employ this method. Limestone powder is mixed with water to form a slurry, which is then placed in an absorption tower as an absorbent to thoroughly mix with flue gas. The flue gas reacts with calcium carbonate in the slurry and with air introduced from the bottom of the tower to produce calcium sulfate. Once the calcium sulfate reaches a certain saturation point, it crystallizes into gypsum dihydrate. The石膏 slurry discharged from the absorption tower is concentrated and dehydrated to a water content of less than 10%, after which it is conveyed to a gypsum storage silo for stacking. The desulfurized flue gas is passed through a demister to remove mist droplets, then heated by a heat exchanger to increase its temperature before being released into the atmosphere through the chimney. Due to the repeated circulation of the absorbent slurry in the absorption tower with the flue gas via a circulating pump, the utilization efficiency of the absorbent is high, with a low calcium-to-sulfur ratio, and the desulfurization efficiency can exceed 95%.

Desulfurization process characteristics:

High desulfurization efficiency

2. Desulfurization by-products are conducive to comprehensive utilization.

3. Technologically mature with excellent operational reliability.