Experimental study of the SO{sub 2} removal efficiency and scale formation in limestone FGD process with lab and pilot test facility
- Hyundai Heavy Industries Co., Ltd., Dongku, Ulsan (Korea, Republic of). Hyundai Industrial Research Inst.
There are several tens of processes applied to Flue Gas Desulfurization (FGD) process in the world, which can be classified as wet, semi-dry and dry type. Among them, the wet type FGD is the most widely applied process for the large scale plant, such as power plant. The fundamental reasons of the preference for the wet type process are its high reliability and economic aspects. About 90% of the wet type process applied to actual plants is using the limestone -based gypsum process. Even though the limestone-based FGD process has simple construction and reliable SO{sub 2} removal efficiency, it has some problems in long-period continuous operation. Among these, the most serious one is the scaling. Scale is the solid mixture of reaction intermediate and by-product formed during various chemical reaction steps of FGD process. There are three types of scale in FGD absorber: calcium sulfite, gypsum, and CSS (Coprecipitated Calcium Sulfate and Sulfite). They have the tendency to precipitate on the absorber internals, such as packing, spray nozzles, mist eliminator, and surface of absorber itself, causing plugging, thus reducing the operation reliability. The major factor responsible for such problem is the lack of understanding for calcium sulfur salts chemistry, which occurred during the reaction steps of FGD process. In this study, the effect of operating conditions--gas velocity, gas temperature, SO{sub 2} concentration, L/G ratio, slurry concentration, etc.--on the SO{sub 2} removal efficiency and scale formation will be investigated. The scale formation mechanism will be studied to verify in a lab-scale test and the control method of scale for reliable operation will be established by the application of the lab-scale test result to pilot-scale facility test.
- OSTI ID:
- 351091
- Report Number(s):
- CONF-970677-; TRN: IM9925%%253
- Resource Relation:
- Conference: 90. annual meeting and exhibition of the Air and Waste Management Association, Toronto (Canada), 8-13 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of 1997 proceedings of the Air and Waste Management Association`s 90. annual meeting and exhibition; PB: [7000] p.
- Country of Publication:
- United States
- Language:
- English
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