A coal-fired decoupling combustion device and combustion method

Abstract

The invention belongs to the field of raw-coal combustion equipment, and particularly relates to a coal-fired decoupling combustion apparatus and a combustion method. The coal-fired decoupling combustion apparatus comprises a furnace and an air chamber (6) positioned below the furnace; the furnace comprises an upper partition wall (1), a first lower partition wall (2) and a second lower partition wall (3), the first lower condition wall (2) and the second lower partition wall (3) are respectively arranged below the inner lower side and the outer side of the upper partition wall (1), a first grate (4) is erected between the top of the inner first lower partition wall (2) and a side wall of the furnace, and a second grate (5) is arranged between the bottom of the first lower partition wall (2) and the bottom of the second lower partition wall (3); a gasification pyrolysis zone (7) and a semi-coke zone (8) are formed between space above the first grate (4) and the upper partition wall (1), and the semi-coke zone (8) is positioned below the gasification pyrolysis zone (7); a coke zone (9) is formed by the first lower partition wall (2) and the second lower partition wall (3). The coal-fired decoupling combustion apparatus and the combustion method have the advantages that a rate of harmful air leakage and an excess air coefficient can be reduced; the harmful air leakage in the semi-coke zone can be effectively reduced, and the capacity and the efficiency of a boiler can be guaranteed.

Description

Technical field [0001] The invention belongs to the field of raw coal combustion equipment, and specifically relates to a coal-fired decoupling combustion device and a combustion method. Background technique [0002] The small and medium-sized coal-fired decoupling combustion devices that have been developed so far have been optimized in terms of smoke suppression and NOx emission reduction, but due to the relatively thin thickness of the semi-coke layer, when the decoupling device burns high ash content and coal is mixed When the gangue burns coal, or when slagging occurs during the combustion process, the harmful air leakage in the semi-coke zone will gradually increase, the decoupling combustion will become unstable, and eventually the furnace temperature will drop and the excess air coefficient will be too high. On the one hand, The smoke suppression effect is not good, the combustion efficiency is reduced, and the boiler output is insufficient. [0003] In addition, in the de...

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Problems solved by technology

In addition, when slagging occurs during coal combustion, or the amount of gangue mixed in the coal increases, the ventilation volume in the semi-coke area should be reduced, otherwise the problem of excessive air leakage in the semi-coke area will also be caused.

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