Coal-fired boiler with low carbon dioxide emission and combustion method

Abstract

The invention relates to a coal-fired boiler with low carbon dioxide emission and a combustion method. The boiler comprises a boiler body, wherein a bottom air inlet, an air outlet, a combustion air supply area and a burnout air supply area are formed in the boiler body; diagonal air inlets of the combustion air supply area and the burnout air supply area supply air to the boiler body to form a tangent circle air field; the boiler further comprises a sinking air supply area located above the burnout air supply area; the sinking air supply area is used for spraying sinking airflow to the center of the boiler body; and the sinking airflow penetrates through a central air-free area of the tangent circle air field to sink to the bottom of the boiler to be mixed with bottom ascending airflow. The sinking airflow generated by the boiler achieves blocking above the burnout air supply area, meanwhile, the sinking airflow sinks from the central air-free area and is combined with the bottom ascending airflow to form circulating airflow, so that the contact time of emissions, coal and oxygen is prolonged, the reaction of all substances is more sufficient, the burnout rate of fuel is obviously increased, the coal combustion cost is reduced, solid particle impurities in smoke dust are reduced, and the emission of gas emissions of CO2, SO2 and NOX is reduced.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a coal-fired boiler and a combustion method capable of reducing emissions of smoke, carbon dioxide and other emissions. Background technique [0002] With the rapid development of the national economy, my country's energy consumption is increasing day by day, and China has become the world's largest energy consumer. In my country's total primary energy consumption, coal consumption has an absolute advantage, accounting for about 70% of total energy consumption. [0003] As an important energy source, coal plays an important role in our country, but at the same time, coal burning also causes serious pollution to the environment. Carbon dioxide and nitrogen oxides are a class of gases that can cause serious air pollution, and are basically considered to be one of the main sources of air pollution. At present, the most important feature of my country's energy composition...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a coal-fired boiler and a combustion method with low carbon dioxide emission, which uses the air supply pipe in the top sunken air supply area to continuously inject airflow to the center of the furnace, and the airflow and the smoke and carbon dioxide in the ascending channel are hedged to form a wind. Screen, blocking smoke, CO 2 , SO 2 , NO X Wait for the discharge to go up, and then pass through the windless area in the center of the furnace to return to the combustion layer and mix with coal to form a secondary cycle combustion, which solves the high coal cost caused by insufficient coal combustion in the prior art and is discharged from the boiler , and the high post-processing cost and heavy processing load caused by the large amount of carbon dioxide, smoke and other pollutant emissions

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