Requirements for coal indicators in environmentally friendly lime kilns
Lime kiln is an important industrial production equipment. In the process of calcining limestone, coal is the main fuel. Its quality directly affects the output and quality of lime and the environmental protection effect in the production process. With the increasing attention of the country to environmental protection, the requirements for coal indicators in environmentally friendly lime kilns have become increasingly strict.
Calorific value is an important indicator for measuring the combustion capacity of coal, directly related to the output and energy consumption of lime kilns. The environmentally friendly lime kiln requires that the calorific value of coal should not be lower than a certain standard, generally speaking, the calorific value should be above 6000 kcal. High calorific value coal can provide more stable heat input during the calcination process, ensuring that the decomposition reaction of limestone is more complete and uniform, thereby improving the quality of lime. Meanwhile, the use of high calorific value coal can also reduce fuel consumption and lower production costs.
Ash is a non combustible inorganic substance in coal, and its content directly affects the combustion efficiency of coal and the quality of lime. Excessive ash content can lead to severe ash accumulation in the kiln, affecting the transfer and utilization of heat, while also increasing the impurity content in lime and reducing its quality. Therefore, environmentally friendly lime kilns require the ash content of coal to be controlled within a certain range to ensure stable combustion efficiency and lime quality.
Sulfur is a harmful component in coal, which produces harmful gases such as sulfur dioxide after combustion, causing pollution to the environment. In order to reduce the emission of harmful gases, environmentally friendly lime kilns require strict control of the sulfur content in coal. Enterprises should take effective emission reduction measures, such as using low sulfur coal and installing desulfurization equipment, to ensure that emissions meet environmental standards.
Volatile matter is a combustible gas released by coal at a certain temperature, and its content affects the ignition and combustion performance of coal. Environmentally friendly lime kilns require coal to have a certain volatile content to ensure that coal can ignite quickly and burn stably. This helps to improve the firing efficiency of lime kilns and reduce production costs.
In addition to the above indicators, environmentally friendly lime kilns also require that the particle size, moisture content, and other indicators of coal meet production requirements. Coal with uniform particle size can ensure even heat distribution during combustion and improve the quality of lime. And appropriate moisture content helps with the combustion process of coal and improves combustion efficiency.
In terms of environmental protection, lime kiln enterprises should also establish comprehensive waste gas, wastewater, and solid waste treatment facilities to ensure effective treatment and disposal of pollutants during the production process. For example, using bag filter and double alkali desulfurization process to treat exhaust gas ensures effective removal of harmful substances in the exhaust gas; Establish comprehensive wastewater treatment facilities and classify the wastewater generated during the production process for treatment; Establish comprehensive solid waste treatment facilities to classify and dispose of solid waste generated during the production process in a harmless manner.
Environmentally friendly lime kilns have very strict requirements for coal indicators, including calorific value, ash content, sulfur content, volatile matter, and other aspects. These requirements aim to ensure the optimal combustion efficiency of coal, the quality of lime, and environmental protection effects. At the same time, enterprises should strengthen environmental management and technological transformation to jointly promote the environmental development of lime kiln enterprises.
