Oxygen-enriched combustion oxygen supply method and device for rotary cement kiln

Abstract

The invention belongs to the technical field of air separation, and particularly relates to an oxygen-enriched combustion oxygen supply method and device for a rotary cement kiln According to the oxygen-enriched combustion oxygen supply method and device for the rotary cement kiln, a membrane separation oxygen production technology is organically coupled to an original compressed air supply facility, and original compressed air is separated into two gases: rich nitrogen and rich oxygen; the generated rich nitrogen directly replaces the compressed air demand of an original factory, and compression energy is recycled; the generated rich oxygen can be sent to the furnace kiln to directly and completely or partially replace the original clean air and coal air to carry out oxygen-enriched combustion, the compression energy of a draught fan is recovered, and additional economic benefits are obtained due to oxygen-enriched combustion; and the extreme condition of compressed air use is fully considered, a standby compressed air compensation loop is adopted for flow compensation, the oxygen supply scheme that oxygen is replaced with compressed air is achieved on the whole, and the energy consumption of oxygen extraction is greatly reduced. According to the oxygen-enriched combustion oxygen supply method and device for the rotary cement kiln, equipment management and maintenance cost is low, potential safety hazards do not exist, and the oxygen-enriched combustion oxygen supply method and device are the preferred scheme for oxygen-enriched combustion energy-saving transformation of a cement plant.

Description

technical field [0001] The invention belongs to the technical field of air separation, and in particular relates to a cement rotary kiln oxygen-enriched combustion oxygen supply method and device. Background technique [0002] Oxygen-enriched, widely used in various fuel oil, gas, coal-fired furnaces (glass, cement, ceramics), various boilers, heating furnaces, incinerators, heat medium furnaces, hot blast stoves, smelting furnaces, aero engines, ship engines, etc. Combustion, energy saving and environmental protection; catalytic cracking, desulfurization, wastewater treatment, engine efficiency enhancement, oxygen-enriched gas (coal) production, various oxidation reactions, fermentation and other fields have also applied oxygen-enriched technology to achieve good economic benefits; in addition, oxygen-enriched It is also widely used in medical care, large-scale oxygen-enriched ventilation, plateau oxygen enhancement, aquaculture, etc., involving petrochemical, chemical, pha...

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Problems solved by technology

[0005] Typical, such as the oxygen-enriched combustion of the rotary kiln in the cement plant, as we all know, the key to its success lies in how to supply oxygen at low cost, effectively reduce the operating cost, maintenance cost and device cost of the oxygen-enriched device, and with the membrane separation material The research and development of organic membrane separation materials used in air separation, the α (alpha) value of oxygen and nitrogen separation is mostly between 2 and 7, and about 30 can be obtained directly from the air under a certain pressure ratio. Oxygen with a purity of ~60%, and the cost control required to increase the separation coefficient of the membrane separation material, further reduce the separation pressure ratio, and increase the permeation volume have reached the limit, and the challenges are becoming more and more unsustainable, especially in many For example, most of the occasions that have compressed air resources in the cement process production process, how to organically combine the compressed air supply and oxygen-enriched separation, make full use of these compressed air facilities such as those used in the original cement process for dust removal and blockage removal, and What kind of separation technology uses these compressed air to obtain oxygen enrichment at low cost while the nitrogen enrichment produced basically does not affect the original gas demand for dust removal and blockage removal, and the oxygen enrichment obtained at this low cost can be used for cement rotary The kiln provides additional oxidant to implement oxy-fuel combustion technology transformation to generate additional economic benefits, and an efficient solution is urgently needed

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