An energy-saving and environment-friendly pulverized coal combustion device

Abstract

The invention discloses an energy-saved and environment-friendly pulverized coal combustion device. A preheating combustion cavity and a combustion furnace are innovatively designed to form a classification combustion structure, so that an oxygen debt reducing atmosphere condition is formed at the beginning of pulverized powder combustion, the generation of NOx is inhibited to a certain extent, and the effects of preheating and assisting of combustion of internal tertiary air and improving the combustion efficiency are achieved; the cyclone blade angle design of the internal tertiary air is innovatively and automatically controlled and adjusted, so that the combustion effect can be controlled in real time, the combustion efficiency is high, and the coal type application range of the combustion device is wider; and a pulverized coal center nozzle mechanism, a pulverized coal concentration distribution area and a primary pulverized powder cyclone area form previous and later two stages of pulverized coal cyclone atomization to assist formation of the combustion reducing atmosphere so as to achieve the effect of improving the combustion efficiency through full combustion. Compared with the prior art, the device is full in pulverized coal combustion, high in heat efficiency, quick in heating, stable in combustion and low in NOx emission, achieves the purposes of energy conservation and environmental protection, and is convenient and fast in maintenance.

Description

technical field [0001] The invention relates to the technical field of asphalt mixture heating and drying, in particular to an energy-saving and environment-friendly pulverized coal combustion device. Background technique [0002] my country is a country with coal as the main energy source. Coal will still be in the primary position in the future development of my country's energy and industry. With the increase of national road mileage year by year, asphalt mixing equipment closely related to road construction There will be a large demand, and the pulverized coal combustion device is the main source of heat energy for sand and gravel drying. Improving the stability of pulverized coal combustion, fully burning to improve thermal efficiency, and reducing NOx emissions are the focus of research on pulverized coal combustion devices. Therefore, new technologies such as pulverized coal thick and thin combustion, air classification and fuel classification have been developed and wi...

AI Technical Summary

Problems solved by technology

The structure of the pulverized coal combustion device in the prior art is simple. Although many batches of improvements have been made, the combustion efficiency and low-load stable combustion characteristics have certain limitations. The inner combustion-supporting air causes the temperature to drop suddenly when it enters the combustion area. , a large amount of underburned coal powder is directly blown out of the combustion device, so that the combustion effect is not ideal, and the coal powder combustion is not sufficient; in addition, the thick and thin coal powder airflow formed by the separation of the coal powder concentrator and the separation cylinder is ejected from the combustion device After the pulverized coal nozzle, affected by the secondary air and its own rigidity, it is easy to mix with the secondary air, and under the sweeping of high-temperature flue gas, NOx is generated again, which affects the NOx suppression performance of the burner

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