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Air distribution process and air distribution system for rotary kiln

A rotary kiln and air distribution technology, which is applied in the field of rotary kiln air distribution technology and system, can solve the problems of weakened convective heat transfer in the kiln, poor fuel adaptability, short flame length, etc., to improve the system heat utilization rate and reduce nitrogen emission Oxide, the effect of reducing the concentration of nitrogen

Active Publication Date: 2013-01-02
徐州燃烧控制研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen-enriched air combustion technology has unfavorable factors such as too fast combustion, short and thick flame length, and weakened convective heat transfer in the kiln, and flue gas recirculation technology has unfavorable factors such as poor fuel adaptability

Method used

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  • Air distribution process and air distribution system for rotary kiln
  • Air distribution process and air distribution system for rotary kiln

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] As shown in Figure 1, the rotary kiln air distribution process of the present invention: in the coal-fired rotary kiln, the temperature in the preheater or waste heat boiler 1 is adjusted to The flue gas at 90°C—350°C is drawn out from the outlet, and sent to the dust collector 3 connected to it through the flue gas pipe 2. The dust collector 3 removes the particles or dust in the flue gas, and then passes through the clean flue gas pipe 4. The gas is sent to the recirculation fan 5, and the flue gas recirculation fan 5 sends the flue gas to the flue gas powder feeding system through the II clean flue gas pipe 6, and then sent to the kiln head burner or calciner 8 by the flue gas powder feeding system , by adjusting the regulating valve on the flue gas pipeline to control the amount of flue gas entering the kiln head burner or calciner 8, so as to adjust the shape of the flame or the position of the high temperature zone of the flame. The flue gas powder feeding system ...

Embodiment 2

[0021] As shown in Figure 2, the rotary kiln air distribution process of the present invention: In a gas or fuel oil rotary kiln, the flue gas at 90°C-350°C in the preheater or waste heat boiler 1 is drawn out, and passed through the flue gas pipe 2 Transport it to the dust collector 3 to remove the particles and dust in the flue gas, and then introduce the flue gas recirculation fan 5 through the I clean flue gas pipe 4; the flue gas recirculation fan 5 passes the purified flue gas through the II clean flue gas pipe 6 is sent directly to the kiln head burner or calciner 8, and the amount of flue gas entering the kiln head burner or calciner 8 is controlled by adjusting the regulating valve on the flue gas pipeline, so as to determine the shape of the flame or the position of the high temperature zone of the flame. Adjustment; other parts are the same as implementation 1, and the same other parts are omitted.

[0022] The system for realizing the air distribution process of th...

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Abstract

The invention provides an air distribution process and an air distribution system for a rotary kiln. The air distribution process comprises smoke purification, smoke recirculation, smoke powder feeding, smoke adjustment, oxygen enrichment preparation and enriching oxygen conveying. Smoke passing through a pre-heater or a waste heat boiler is subjected to particle and dust removal through a de-duster, and the smoke passing through a smoke recirculation fan is used for conveying coal powder for a kiln head combustor or a decomposing furnace, and is used as smoke gas at the center of the combustor to adjust flame shape and the position of a flame high-temperature area; air with high oxygen concentration is prepared by oxygen preparing equipment, and is conveyed to the kiln head combustor or is supplied into an air duct of the decomposing furnace after the air with high oxygen concentration is mixed with the air to obtain the air with relatively low oxygen concentration. According to the air distribution process provided by the invention, the oxygen enrichment air combustion supporting and the smoke recirculation can be comprehensively used on the rotary kiln, so that the involvement amount of cold air is reduced; the fuel coal consumption amount is reduced; the flame shape and the position of the high-temperature area can be adjusted; the generation of nitric oxides is reduced; the selection range of fuel is widened; and the system use ratio is improved. The air distribution process and system are simple, are convenient to use, and have good utilization effect.

Description

technical field [0001] The invention relates to an air distribution process and system, in particular to a rotary kiln air distribution process and system suitable for the comprehensive application of oxygen-enriched air combustion and flue gas recirculation in the cement industry. Background technique [0002] The cement industry is a resource-intensive industry that consumes a lot of energy and ore resources. It is currently severely restricted by insufficient resources and environmental pollution. my country's comprehensive energy consumption per ton of cement is still far behind the world level. Coal accounts for about 35%-40% of cement production costs. Therefore, for the cement industry, reducing coal consumption is an effective way to reduce production costs. [0003] After the rapid development during the "Eleventh Five-Year Plan" period, my country's cement production has reached 1.88 billion tons, of which the production capacity of new dry process cement clinke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/36F27D17/00
CPCY02P10/25
Inventor 孙昌栋高克迎张举乐雍占锋刘远平姚强周娜
Owner 徐州燃烧控制研究院有限公司
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