热重分析技术研究钙基脱硫剂焙烧特性

Investigation of the Calcination Characteristics of Calcium-based Sorbent in TGA

在流化床煤气炉中，一种有效的炉内脱硫方法是加入石灰石（ＣａＣＯ３）或白云石（ＣａＣＯ３．ＭｇＣＯ３）等钙基脱硫剂，以硫化钙（ＣａＳ）的形式从系统中脱去硫．在流化床煤气炉的高温（８５０℃～９５０℃）环境下，钙基脱硫剂将进行焙烧反应，它们的焙烧特性影响接下去的硫化（脱硫）反应，因此也就影响总的捕硫率．本研究利用热重分析仪（ＴＧＡ）分析研究了脱硫剂颗粒尺寸、焙烧温度和二氧化碳（ＣＯ２）分压力对４种南澳石灰石和一种白云石焙烧率的影响．

In a fluid-bed gasifier, an effective in-bed desulfurization can be carried out by adding a calcium-based sorbent, such as limestone (CaCO 3) or dolomite (MgCO 3.CaCO 3) to remove the sulfur from the system in the form of CaS. Calcium-based sorbents undergo calcination in the high-temperature environment of the gasifer. The characteristics of their calcination affect subsequent sulfidation reactions and hence overall sulfur capture. This paper discussed the effect of sorbent particle size, calcination temperature and carbon dioxide (CO 2) partial pressure on calcination rates of four South Australian calcium-based sorbents: Angaston limestone, Caroline limestone, klein Point limestone and Ardrosson dolomite. The tests were done with a thermogravimetric analysiser (TGA).