Methods of flue gas desulfurization and denitrification technology

At present, there are dozens of flue gas desulfurization technologies. According to whether water is added to the desulfurization process and the dry and wet shape of desulfurization products, flue gas desulfurization can be divided into wet and dry desulfurization processes. Wet desulfurization technology is relatively sophisticated, with high power and simple operation.

1. Wet flue gas desulfurization technology

Benefits: The wet flue gas desulfurization technology is a gas-liquid reaction with fast reaction speed and high desulfurization power, which is generally higher than 90%. The technology is sophisticated and has a wide range of applications. Wet desulfurization technology is relatively sophisticated, safe and reliable in production, and has always played a leading role in many desulfurization technologies.

Classification: Common wet flue gas desulfurization technologies include limestone gypsum method, direct limestone gypsum method, lemon absorption method, etc.

2. Dry flue gas desulfurization technology

Benefits: The dry flue gas desulfurization technology is gas reaction. Compared with the wet desulfurization system, the equipment is simple, the floor area is small, the investment and work costs are low, the operation is convenient, the energy consumption is low, the products are easy to dispose, and there is no sewage treatment system.

Disadvantages: however, the reaction speed is slow, the desulfurization rate is low, and the advanced one can reach 60-80%. However, this method has low desulfurization power, low utilization rate of absorbent, serious wear and scaling, and is difficult to maintain equipment. The stability and reliability of equipment operation are not high, and the service life is short, which restricts the use of this method.

Dry flue gas desulfurization technology has been applied to large converters and blast furnaces in the iron and steel industry, for example, but it is not applicable to medium and small blast furnaces. The advantage of dry desulfurization technology is that the process is simple, there is no sewage and waste acid treatment problem, and the energy consumption is low, especially the high temperature of purified flue gas, which is conducive to the dispersion of chimney exhaust, and will not produce "white smoke". The purified flue gas does not need secondary heating, and the corrosivity is small; Its disadvantages are low desulfurization power, huge equipment, large investment, large floor area, and high technical requirements for operation.