A model for desulphurisation with limestone in a fluidised coal combustor

✍ Scribed by J. Zheng; J.G. Yates; P.N. Rowe

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 644 KB
• Volume: 37
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(82)80151-6

✦ Synopsis

Kinetic expressions used to describe the reactions of deactivating catalyst particles are applied here to the sulphation of calcined limestone in a fluidised bed coal comhustor where reactivity diminishes as pores fill with sulphate. Following closely the recent work of Fieldes and Davidson it is shown how experiments with batchwise addition of limestone to the combustor may be used to derive the two reaction rate constants of the system, k, and !Q, and how these may be incorporated into a two-phase model of a tluidised bed reactor to obtain predictions of desulphurisation etliciency under conditions of continuous operation. The resulting equation for SOI retention, 7, may be simplified to:

where K is a function of limestone type and operating conditions and p is the calcium-to-sulphur mole ratio. The predictions of this equation are shown to be in agreement with experimental results.