Environment-friendly oxygen-enriched combustion method applied to cement kiln and device thereof

Abstract

The invention relates to an environment-friendly oxygen-enriched combustion method applied to a cement kiln and a device thereof, and belongs to the technical field of cement production through a dry method. The environment-friendly oxygen-enriched combustion method applied to the cement kiln includes the following process steps of (1) preparation of oxygen-enriched air, wherein a membrane method is adopted to generate oxygen, so that the oxygen-enriched air is produced; (2) oxygen-enriched combustion supporting, wherein a first path of the oxygen-enriched air enters a kiln head coal air pipeline through an air cooler, a second path of the oxygen-enriched air is fed into a kiln head air purification pipeline through a primary air fan, and a third path of the oxygen-enriched air is fed into a decomposing furnace through a decomposing furnace staged combustion denitration pipe. The environment-friendly oxygen-enriched combustion device applied to the cement kiln comprises an air filter, a centrifugal fan, a membrane separator, a vacuum pump, a pressure stabilizing buffer tank and a connection pipeline, wherein the air filter is connected with the membrane separator through the centrifugal fan, and the membrane separator is connected with the vacuum pump which is communicated with three pipelines. According to the method and device, NOx emission concentration of the cement kiln can be effectively reduced, the complete combustion degree of pulverized coal can be effectively increased, and the environment protection effects of energy conservation, consumption reduction and reduction of the NOx emission concentration are achieved.

Description

technical field [0001] The invention belongs to the technical field of dry cement production, and in particular relates to an environment-friendly oxygen-enriched combustion method and a device thereof suitable for cement kilns. Background technique [0002] At present, in the cement industry, some developed countries in Europe and the United States have conducted long-term and in-depth research on oxygen-enriched combustion technology in cement kilns. For example, American cement plants such as Lafarge Corporation-Alpena have installed oxygen-enriched combustion-supporting equipment; a large number of excellent manufacturers have emerged in China. Oxygen equipment manufacturers and applied to some domestic cement production lines. [0003] The new dry process cement production process has certain requirements on the design of raw coal. Generally, the quality requirements of the coal used for calcining in rotary kilns: ash content A d <27%, Volatile V daf >25%, calor...

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Problems solved by technology

[0004] However, at this stage, most of the domestic and foreign oxy-fuel combustion technologies for cement kilns stay on how to reduce the coal consumption per unit of clinker, and basically do not involve the reduction of NO x emission concentration

Therefore, after installing oxygen-enriched combustion-supporting equipment in many production lines, although some effects have been achieved in terms of energy saving, the reduction in NO x emission concentration, especially in reducing the NO produced in the decomposition furnace x The concentration did not achieve good results, but it increased to a certain extent in some production lines, resulting in NO x New Environmental Problems Caused by Emissions

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