Progress in dry flue gas desulfurization technology and process for industrial flue gas

With the increasing emphasis on environmental protection in our country, the combination of desulfurization and wet desulfurization methods for enterprise pollutant emissions have been increasingly restricted in recent times. The emission of sulfur dioxide (SO.) is a technology of our state-owned enterprise. One of the important indicators for controlling emissions in the industry. The local emission standards for air pollutants 1.1 dry flue gas desulfurization technology in Beijing require that from January 1, 2018. SO, the emission limit of dry flue gas desulfurization technology refers to the application of powder or granular absorption values ≤ 20mg/m3. Hebei Province and Jiangsu Province have also respectively issued the "Hebei Province Adsorbent or Catalyst to Remove Sulfur Components from Flue Gas. Dry Air Pollution Prevention and Control Regulations (2016)" and the "Jiangsu Provincial Environmental Protection Department Document Method for Desulfurization Does not produce waste acid and wastewater, and has less corrosion to equipment." The environmental protection regulations have been upgraded to S-level, which requires higher flue gas temperature and less heat loss after desulfurization technology. However, there are higher requirements for desulfurization efficiency, low reaction rate, and slow reaction speed. Waiting for insufficient. There are currently two representative desulfurization technologies, namely metal oxide dry desulfurization technology and furnace calcium injection desulfurization technology.
At present, desulfurization technology is mainly divided into three categories: dry desulfurization and semi dry. 1.1.1 Metal oxide dry desulfurization technology is collected and then mixed with fresh absorbent to use metal oxide dry desulfurization technology in a cyclic manner. One important application of NID semi dry desulfurization technology is to control the process parameters, including desulfurization efficiency and high-temperature gas desulfurization. At present, the main desulfurizers include iron-based zinc based materials, chemical ratios, temperature and relative humidity, and the addition of metal oxides such as manganese based materials. The principle of desulfurization reaction is metal oxidation. This method has a good desulfurization effect, with a removal rate of up to 90%. Metal sulfides and water are generated between the material and HS, which fix the sulfur in HS. In addition, it also has a device with short water evaporation time and a small footprint. The drawback of this technology is that the catalyst preparation process is relatively complex. The process flow is shown in Figure 1. Miscellaneous, needs to be used again. HAH dust collector~chimney