Study on a Novel Semidry Flue Gas Desulfurization with Multifluid Alkaline Spray Generator

• Published in: Industrial & engineering chemistry research Vol. 44; no. 23; pp. 8830 - 8836
• Main Authors: Zhou, Yuegui, Zhang, Mingchuan, Wang, Dongfu, Wang, Lei
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 09.11.2005
• Subjects: 01 COAL, LIGNITE, AND PEAT; ADSORBENTS; AIR POLLUTION CONTROL; Applied sciences; Atmospheric pollution; CALCIUM CARBONATES; Chemical engineering; DESULFURIZATION; DRY SCRUBBERS; Exact sciences and technology; FLUE GAS; General processes of purification and dust removal; PH VALUE; Pollution; Prevention and purification methods; SPRAYS; WATER; Desulfurization; Flue gas purification
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie050457n

The advantages and disadvantages of the typical semidry flue gas desulfurization (FGD) processes are analyzed, and a novel semidry FGD process with multifluid alkaline spray generator is first proposed to improve the colliding contact efficiency between sorbent particles and spray water droplets, and to form a large amount of aqueous lime slurry. The experimental results show that the colliding contact efficiency between lime particles and water droplets in the prefix alkaline spray generator may reach about 70%, which is significantly higher than the colliding contact efficiency of 25% in duct sorbent injection. The SO2 removal efficiency can reach 64.5% when the Ca/S molar ratio is 1.5, the approach to the saturation temperature is 10.3 °C, and the flue gas residence time is 2.25 s. It is higher than that of in-duct sorbent injection under similar conditions, and the sorbent utilization is improved to 43%. Therefore, the FGD process with a prefix alkaline spray generator can greatly improve SO2 removal efficiency and sorbent utilization and it will be a new, simple and efficient semidry FGD process for industrial application in the future.