Experimental and model investigation on the mass balance of a dry circulating fluidized bed for flue gas desulfurization system

The 8th Korea-China Clean Energy Workshop

DOI: 10.1007/s11814-011-0056-y

Cite this article as:
Li, Y. & You, C. Korean J. Chem. Eng. (2011) 28: 1956. doi:10.1007/s11814-011-0056-y

Abstract

A moderate temperature dry circulating fluidized bed flue gas desulfurization (CFB-FGD) process was developed using rapidly hydrated sorbent. This technique has the advantages of low cost, no water consumption, and a valuable dry product CaSO4. To keep the system operation stable, a mass balance model, based on cell model considering flow state, particle abrasion, particle residence time, particle segregation and desulfurization processes, was built to predict the system state and optimize the operating condition. Experimental studies were conducted on a pilot-scale CFB-FGD system with rapidly hydrated sorbent made from CFB circulating ash and lime (circulating ash sorbent) or coal fly ash and lime (coal fly ash sorbent). Calculated results were compared with experimental results and the relative error was less than 10%. The results indicated that feed sorbent mass, feed sorbent size, superficial gas velocity, particle abrasion coefficient and cyclone efficiency had significant influence on the mass balance of CFB system. The circulating ash sorbent was better than the coal fly ash sorbent, for providing higher desulfurization efficiency and being better for the CFB-FGD system to achieve mass balance.

Key words

CFB-FGD Rapidly Hydrated Sorbent Mass Balance 

Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2011

Authors and Affiliations

  1. 1.Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal EngineeringTsinghua UniversityBeijingChina