Environmentally friendly lime shaft kiln uses coking coal or anthracite as fuel
Against the backdrop of increasingly stringent environmental requirements, achieving clean production through fuel innovation has become crucial for traditional lime shaft kilns. Coking coal and anthracite, due to their low sulfur and high calorific value characteristics, are gradually replacing high polluting fuels and becoming the mainstream choice for environmentally friendly lime kilns.
Coking coal, as a high-quality metallurgical fuel, has a high fixed carbon content and stable combustion, which can effectively improve the temperature uniformity inside the kiln and promote the full decomposition of limestone. By optimizing the air distribution system and combustion control technology, the emissions of sulfur dioxide and nitrogen oxides generated by coking coal combustion can be reduced by more than 30%, while reducing dust emissions. Anthracite, on the other hand, has the advantages of low volatile matter and high ash melting point, maintaining stable combustion in high temperature environments. Combined with bag dust removal and wet desulfurization devices, it can achieve ultra-low emissions of flue gas.
In practical application, a certain enterprise adopts an environmentally friendly shaft kiln project using smokeless coal. Through graded combustion technology and waste heat recovery system, the energy consumption per ton of ash is reduced by 15%, and the carbon dioxide emission intensity is 20% higher than the national standard. This practice shows that scientifically selecting fuels and matching them with advanced environmental protection equipment can not only ensure the quality of lime, but also significantly reduce environmental load. In the future, with the continuous breakthroughs in clean combustion technology, coking coal and anthracite will play a greater role in the green transformation of the lime industry.
