一种高温复合固硫剂的研制及机理分析

Experimental Development and Mechanism Analysis on A Mixed Fixing-sulfur Sorbent at High Temperature

对自行研制的一种高温复合固硫剂进行了燃煤高温固硫试验。结果表明:在1200℃的条件下,对实验用无烟煤(含硫量0.74%)和烟煤(含硫量0.659%)燃烧20min,其高温固硫率分别高达75%、67%,较相同条件下的普通钙基固硫剂的固硫率提高25%以上。对固硫产物的XRD、偏光显微镜下分析表明,该固硫剂固硫效率高的主要原因是:(1)大大减少了高温下氧化钙的烧结僵化;(2)生成了高温稳定的含硫矿物相;(3)使易分解的硫酸钙被高温熔体所包裹。由于该固硫剂主要由天然矿物所组成,具有来源广、成本低廉等优势,因而具有极高的应用价值和市场推广潜力。

Many variety of experiments were made on self-producing mixed fixing-sulfur sorbent of coal combustion in the laboratory scale under higher temperature condition. The experimental results show that high-temperature fixing-sulfur efficiency of the sorbent reaches 75% and 67% respectively for power anthracite coal(total sulfur content 0.74%)and bituminous coal(total sulfur content0.659%)at 1200℃ for 20min combustion,which is 25% higher than the ordinary calcium-based sorbent under the same conditions. By inspecting the structure and monography of coal cinder with polarizing microscope and X-ray diffraction(XRD),we deduce that several probable reasons for higher fixing-sulfur efficiency are:(1)decreasing the CaO sintering extents;(2)producing the new thermal stability sulfur mineral phase;(3)enwrapping the sulfation product CaSO_4 by the little melt body. Owing to being composed of natural minerals,the fixing-sulfur sorbent is generally characterized by low capital cost and higher practical value and broader marketing potentiality.