Low-heating-value coal gangue combustion method

Abstract

The invention provides a low-heating-value coal gangue combustion method, belongs to a coal combustion method, and aims to provide the low-heating-value coal gangue combustion method capable of improving the coal gangue combustion efficiency and reducing polluted gas emission. A biomass, a combustion improver and a sulphur-fixing agent are added according to a certain mass ratio, and are aged fora certain time after being uniformly mixed to obtain fuel for a coal-fired boiler, and three-times air supply is performed forcedly at the bottom of a fire grate of the coal-fired boiler when the fuelis fed at constant speed according to the fire coal amount required in combustion of the boiler by a mechanical coal feeding device, so that the sufficient combustion of the fuel of the coal-fired boiler is ensured. By improving the concentrations of oxygen and carbon dioxide, the rate of dissociation of carbon dioxide in fume is reduced, the content of carbon monoxide is reduced, the chemical incomplete combustion loss is reduced, the combustion burnout degree is beneficially improved, the heating value requirements of thermal power generation fuel are met, and finally the heating efficiencyof low-heating-value coal gangue can be improved by 30%-50%.

Description

technical field [0001] The invention belongs to a method for burning coal; in particular, it relates to a method for burning coal gangue with low calorific value. Background technique [0002] A large amount of coal gangue and coal slime will be produced in the process of coal mining and sorting. At present, coal gangue and coal slime account for about 20% and 17% of my country's industrial solid waste, respectively. A large amount of coal gangue and coal slime will cause serious harm to human beings and the environment, so the resource utilization of coal gangue and coal slime is particularly important. At present, combustion power generation is the most important way to utilize coal gangue and coal slime. The calorific value of coal gangue and coal slime combustion power generation process is low, and will produce SO 2 , NO x And heavy metals, etc., cause serious pollution to the environment and lead to the generation of haze. At present, there is no effective combustion...

AI Technical Summary

Problems solved by technology

At present, combustion power generation is the most important way to utilize coal gangue and coal slime. The calorific value of coal gangue and coal slime combustion power generation process is low, and will produce SO 2 , NO x and heavy metals, etc., which cause serious pollution to the environment and lead to the generation of haze. At present, there is no effective combustion method for coal gangue