Coal ash blending combustion and gasification process and system for pulverized coal furnace

Abstract

The invention relates to a coal ash blending combustion and gasification process and system for a pulverized coal furnace. The process comprises the steps of 1, pretreatment and temporary storage of gasified coal ash, 2, pumping of the gasified coal ash, 3, preparation of gasified coal ash powder, and 4, gradient charging combustion of the gasified coal ash powder. In the step 1, impurity removal, separation prevention and temporary storage are carried out on the gasified coal ash, so that the gasified coal ash has characteristics suitable for pumping; in the step 2, the gasified coal ash is conveyed into a gasified coal ash pulverizing unit in a sealed manner through a conveying pump and a pipeline; in the step 3, by adopting a fuel gas heating or high-temperature steam heat exchange method, the outlet temperature of a coal mill and the inlet air volume are improved, and the gasified coal ash powder meeting the combustion requirement is obtained; and in the step 4, the gasified coal ash powder is fed into the pulverized coal furnace according to different proportions and fed into the pulverized coal furnace for mixed combustion in a layered and gradient manner. According to the coal ash blending combustion and gasification process and system for the pulverized coal furnace, blending combustion power generation of the gasified coal ash pulverized coal furnace is achieved, the operation stability and reliability of a blending combustion system are improved, the boiler coal-fired resources are saved, the energy-saving and emission-reducing effects are obvious, and pollution of waste to the environment is eliminated.

Description

technical field [0001] The invention relates to the technical field of solid waste disposal, in particular to a process and system for co-firing gasified coal ash in a pulverized coal furnace. Background technique [0002] my country is a relatively "rich in coal and less in oil" country. For a long time, coal has accounted for more than 75% of China's energy mix. It is of great strategic significance to vigorously develop the coal chemical industry and make it an effective supplement to the petrochemical industry. In recent years, my country's coal chemical industry has made great progress. Modern coal chemical products such as coal-to-oil, coal-to-olefin, coal-to-dimethyl ether and coal-to-ethylene glycol have partially replaced petrochemical products. [0003] Gasification coal ash is a by-product of the coal chemical production process. Gasification coal ash contains a large amount of combustible components and has a certain calorific value. It is a pity to discard i...

AI Technical Summary

Problems solved by technology

In this way, it restricts and affects the resource utilization of gasification coal ash

Images