Coal-fired boiler with function of suppressing nitrogen oxide emission

Abstract

The invention discloses a coal-fired boiler with a function of suppressing nitrogen oxide emission. The coal-fired boiler comprises a body; the bottom of the body is provided with a natural wind grate; a smoke tube and a dust removal tube are provided in the upper portion of the inside of the body; vertical water-cooled walls are symmetrically disposed within the body; a secondary combustion area is provided above the natural wind grate; the smoke tube is connected with a smoke dedusting and purifying unit through a smoke and dust incoming pipe; the smoke dedusting and purifying unit comprises another smoke and dust incoming pipe, an exhaust pipe, a main purifying column and a suction pump; the bottom of the main purifying column is provided with a purifying pool. The coal-fired boiler has the advantages that combustion speed is quickened, heat efficiency is greatly improved, combustion time is saved, the smoke tube is connected to the smoke dedusting and purifying unit, advanced impurity filtering allows life of purifying liquid to be effectively prolonged and pollution-free post-treatment of the purifying liquid, which reaches the end of life, to be easier, overall operation is simple, running is stable, the nitrogen oxides are suppressed, the natural wind combustion area allows continual combustion, and high utilization of high energy and low application of low energy are achieved.

Description

technical field [0001] The invention relates to a boiler, in particular to a coal-fired boiler that suppresses the emission of nitrogen oxides. Background technique [0002] There are two main sources of boiler flue gas nitrogen oxides: 1. The combustion of nitrogen-containing compounds in coal; 2. The combustion temperature of the boiler is too high, resulting in the nitrogen in the air 2 oxidized to NO X . The targeted solution is to use as much coal as possible to burn nitrogen oxides according to the actual production data for the first part; since the second part is the main source of nitrogen oxides in the flue gas, nitrogen and oxygen are produced at high temperatures. The amount of reaction depends mainly on the combustion temperature, nitrogen concentration and oxygen concentration. The higher the temperature and the greater the concentration, the more nitrogen oxides will be produced. Most boilers reduce the flame temperature in the combustion zone and at the sa...

AI Technical Summary

Problems solved by technology

The applicant has applied for a patent before, which is about an anthracite coal-fired boiler that adds coal in the middle and burns on both sides to suppress the emission of nitrogen oxides. It effectively suppresses the emission of nitrogen oxides, performs smokeless combustion, and has high thermal efficiency, but the combustion area It adopts the natural wind combustion method, which has a slow fire speed and a long burning time. If it is directly burned with a fan, it will emit smoke and pollute the environment

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