Combustor for efficiently and stably combusting anthracite coal in decomposition furnace

Abstract

The invention relates to a combustor for efficiently and stably combusting anthracite coal in a decomposition furnace. The combustor consists of a center air passage, a clean air passage and an annular space, wherein the annular space is formed between the center air passage and the clean air passage; a plurality of coal air passages are uniformly distributed inside the annular space; a rotational porous annular partition is arranged at the outlet of the annular space; the outlet end of the center air passage and the outlet end of the clean air passage are each provided with a rotational flow generating device; the outlet of the center air passage adopts an external expansion design; the outlet of the clean air passage adopts an internal shrinkage design. The combustor disclosed by the invention is unique in structure and capable of making coal powder be completely coated and preheated by high-temperature tertiary air; meanwhile, clearances exist among a plurality of coal powder beams, so the contact area between high-temperature gas and the coal powder is greatly increased, the preheating speed of coal powder flow is remarkably increased, the anthracite coal is enabled to reach the ignition temperature after entering a high-oxygen-concentration region, the combustion efficiency is improved, and the amount of consumed coal is reduced; the amount of fed coal is automatically controlled, and the porous annular partition is rotationally regulated, so the rigidity of coal air is stabilized, the thermal load in a hearth is also effectively regulated, the combustion stability is guaranteed, the temperature in the decomposition furnace is uniformly distributed, and emission of NOx is reduced.

Description

technical field [0001] The invention relates to a component of cement production equipment, in particular to a burner for efficiently and stably burning anthracite in a calciner. Background technique [0002] It is well known that anthracite is a kind of difficult-to-combust coal, which has combustion characteristics such as high ignition temperature, slow ignition, concentrated combustion heat release, and short flame. There are problems such as poor combustion stability and low burn-out rate during combustion. When anthracite is used as fuel in the calciner, the rapid ignition and stable combustion of pulverized coal are crucial to the combustion efficiency and safe operation of the calciner. [0003] In the current domestic and foreign technologies, based on the principle of enhanced combustion, the pulverized coal burner in the calciner generally adopts a multi-channel structure including a central air channel, a coal air channel, and a clean air channel. Among them, th...

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Problems solved by technology

Among them, the coal air channel is generally an integral circular channel, and the heat exchange effect between pulverized coal and high-temperature gas is poor, and because the central air and net air use ambient cold air, the amount of cold air is increased, which is not conducive to the timely removal of anthracite. Fire and embers will undoubtedly increase the energy consumption of clinker and the cost of cement production

At the same time, the existing burner adapts to the load change in the furnace by adjusting the amount of air and coal. Because the outlet area is not adjusted synchronously, the outlet speed fluctuates with the load adjustment. When the load decreases, the amount of pulverized coal injected decreases, and the pulverized coal flow Decreased rigidity will have an adverse effect on timely ignition and stable combustion of pulverized coal

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