炉内钙基脱硫两种反应过程机理研究

Characteristics Comparison of Mechanism Study About Two Sulfation Process in Calcium-based Desulfurization in Furnace

为了控制SO2的排放,人们对燃煤锅炉采用钙基固硫的方法进行治理。传统方式脱硫过程,石灰石进入炉内首先发生煅烧分解,之后生成的CaO在O2、SO2出现时发生硫化反应。尽管研究者采用物理及化学方法来对石灰石的钙利用率加以提高,但终因伴随硫化反应过程CaO不可逆转的高温烧结以及致密CaSO4产物层的形成,使得脱硫效率维持在一较低的水平。然而高压系统下较高CO2浓度所致的直接硫化反应CaCO3-SO2的提出使这一难题有了突破性的进展。通过详述2种硫化过程的反应特性,目的在于更好地了解直接硫化反应特性,并在工程技术上加以开发、应用。

The calcium-based desulfurization method was adopt to control the discharge of SO2 of coal-burning boiler. During the conventional desulphurization course, when limestone enters stove, it decompose to CaO firstly, which subsequently combines with SO2 to form calcium sulfate. Though the researchers adopted physics and chemical methods to raise the calcium utilization ratio of the limestone, the sintering of CaO irreversibly in high temperature and the forming of dense products of CaSO4, make desulphurization efficiency maintain a low level. But with higher CO2 concentration, the sulfuration reaction happens between CaCO3 and SO2, which make significant progress in the problem of low-desulphurization efficiency. The purpose of this paper lie in understanding mechanism characteristics of direct sulfation better, by comparing detailedly the two courses, and makeing it develop and applicate on engineering.