Compound recycling low-nitrogen combustion method for chain boiler

Abstract

The invention discloses a compound recycling low-nitrogen combustion method for a chain boiler. The method comprises the steps that boiler combustion wind is supplied into a combustion preparation zone, a fuel combustion zone, an oxidation zone, a reducing zone and a burn-out zone of the boiler according to the proportion, 0% of the boiler combustion wind is supplied to the combustion preparation zone, 10-15% of the boiler combustion wind is supplied to the fuel combustion zone, 15-25% of the boiler combustion wind is supplied to the oxidation zone, 35-40% of the boiler combustion wind is supplied to the reducing zone, and 0-5% of the boiler combustion wind is supplied to the burn-out zone; low-temperature smoke after combustion in the boiler is extracted, supplied to the combustion preparation zone, the fuel combustion zone, the oxidation zone, the reducing zone and the burn-out zone after boosting is carried out, and mixed with the boiler combustion wind so as to be supplied to the chain boiler to be combusted. According to the compound recycling low-nitrogen combustion method for the chain boiler, generation of fuel type NOx and heating power type NOx can be effectively controlled, full combustion of the fuel can be promoted, and the optimal combustion effect in a combustion chamber of the boiler is achieved easily.

Description

technical field [0001] The invention relates to a combustion control method, in particular to a combustion control method for a boiler. Background technique [0002] At present, my country has more than 600,000 industrial boilers, most of which are chain boilers. However, affected by factors such as coal quality and chain boiler design and operating status, chain boilers generally have problems such as low combustion efficiency, large combustion losses, and high pollutant emissions in the actual application process. Among them, the chain boiler will generate nitrogen oxides (NO x ), which is one of the important sources of air pollution, for this reason, the NO emitted by the chain boiler x Gas control at a relatively low level is of great significance for energy saving, emission reduction and environmental protection. [0003] NO and NO produced during boiler combustion 2 Collectively referred to as NO x . According to NO x The formation mechanism of NO can be divide...

AI Technical Summary

Problems solved by technology

The way of air supply through the warehouse used in the prior art will make the air supply volume increase as the grate moves towards the rear end, the air at the rear end of the grate is excessive, and the air in the middle combustion area of ​​the grate is insufficient, resulting in the front end of the grate being At the initial stage of fuel ignition, a large amount of volatile combustible gas in coal is precipitated, and a large amount of fuel-type NO is generated with excess air. x

In addition, due to the large amount of volatile combustible gases in coal precipitated, the mechanical and chemical incomplete combustion losses of the fuel will increase, and a large part of the heat will be taken away with the unused air, and the exhaust heat loss will increase. Big

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