Pulverized coal combustion system with porous wall wind coupled air classification

Abstract

The invention belongs to the field of clean and efficient combustion of coil and particularly relates to a pulverized coal combustion system with porous wall wind coupled air classification. According to the pulverized coal combustion system with porous wall wind coupled air classification, a mixture of air and pulverized coal enters the top of a combustion furnace and is ignited and burnt, the mixture passes a porous wall wind coupling portion from top to bottom for combustion, through combustion of a complete combustion portion, exhaust gas and waste slag are discharged from the bottom of the furnace and separated, flying ash of the separated exhaust gas is filtered out through a filter, and the exhaust gas is cooled through a cooler, detected through a smoke analyzer and finally exhausted to the environment. A wall face can be protected through porous wall wind and high-temperature corrosion is prevented; the porous wall wind is perpendicularly blown to a hearth, the mixing effect of the pulverized coal and the air is enhanced, and pulverized coal combustion is promoted.

Description

technical field [0001] The invention belongs to the field of clean and high-efficiency coal combustion, in particular to a pulverized coal combustion system with porous wall wind coupled with air classification. Background technique [0002] The air staged combustion technology of pulverized coal is the most widely used low-NOx combustion technology, which is characterized by introducing part of the air required for combustion (also known as separated overburning air) from an appropriate distance from the main burner, so that the combustion area Split into an oxygen-lean combustion zone (also known as a reduction zone) and an oxygen-enriched zone. Pulverized coal air staged combustion technology is very effective in reducing nitrogen oxide emissions, but it also has the following disadvantages: 1) The water wall is prone to high temperature corrosion. Using air staged combustion, the oxygen-poor combustion zone of the furnace produces a large amount of reducing substances s...

AI Technical Summary

Problems solved by technology

Pulverized coal air staged combustion technology is very effective in reducing nitrogen oxide emissions, but it also has the following disadvantages: 1) The water wall is prone to high temperature corrosion

2) Reduced combustion efficiency of pulverized coal

However, the introduction of the wall-attached wind often leads to the following problems: 1) The wall-attached wind is horizontal and parallel to the water-cooled wall, which is an ineffective wind for pulverized coal combustion and cannot improve the combustion efficiency; 2) The wall-attached wind is Concentrated air supply, uneven distribution in the furnace, resulting in uneven distribution of smoke temperature and smoke velocity at the furnace outlet, aggravating the heat absorption deviation of the heating surface, and easily causing safety accidents

There are two reasons for the above-mentioned problems caused by the wall-attached wind: 1) The wind direction is parallel to the water-cooled wall, so that it cannot participate in the combustion of pulverized coal; 2) The air distribution method of centralized air intake causes uneven distribution of the air distribution in the furnace

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