Coal-gas combined efficient low-emission grate firing combustion apparatus and technology

Abstract

The invention relates to a coal-gas combined efficient low-emission grate firing combustion apparatus and a technology. Pulverized coal and sulphur-fixing agent are fully mixed and conveyed into a combustion chamber, hot pulverized coal is added, and simultaneously, recycle smoke is introduced to the bottom, the pulverized coal is quickly pyrolyzed and generates reducing gas, and the reducing gas is sprayed at two sides of a reburning region, thus, local reducing atmosphere is formed, the aim of strengthening NOx reducing is realized, the unburnt particles are burnt sequentially in the burning region of the combustion chamber, the end gas generated after combustion participates in the smoke recycle after being led out and treated by dust extraction, and the smoke enters in the combustion chamber for being used in the above pyrolyzation and combustion. With the apparatus and the technology provided by the invention, the conversion of fuel nitrogen to NOx is reduced, and the combustion efficiency of a grate furnace can also be improved.

Description

technical field [0001] The invention relates to a layer combustion device and process, in particular to a method for reducing NOx and SO in a layer combustion furnace by adjusting the combustion method (combination of flue gas recirculation technology, fuel graded combustion technology and coal-fired gas matching technology). 2 A layer-fired combustion device and process for improving the combustion efficiency of a layer-fired boiler. Background technique [0002] In my country's energy structure, coal occupies a dominant position, and for a long period of time in the future, the position of this basic energy will not be shaken. The number of coal-fired industrial boilers in my country is about 530,000, and its annual coal consumption accounts for about 1 / 3 of my country's annual coal consumption. At present, the industrial boilers used in my country are mainly layer-fired furnaces. Due to design and operation reasons, the thermal efficiency of boilers is generally low. In...

AI Technical Summary

Problems solved by technology

However, in this patent, the combustible gas and small particle semi-coke produced in the oxidation pyrolysis chamber of the layer combustion furnace can reduce the production of NOx. Reducing gas (NH i , HCN, CH i 、H 2 and CO, etc.), and the pyrolysis rate is low, the output of reducing gas fluctuates greatly due to the change of coal quality, and it is difficult to adjust and control, especially for inferior bituminous coal, less reducing gas is produced, and the effect of reducing NOx is not obvious; the patent The output of the boiler is affected due to the installation of an oxidation pyrolysis chamber in the layer-fired furnace; in addition, the patent has a large modification to the boiler body in engineering applications, and the construction is relatively difficult

With the increasing environmental protection requirements, NOx emissions will be more stringent, so the industrial applicability of this patent is poor, and it cannot meet the increasingly stringent environmental protection requirements

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