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Roasting process for active lime in rotary kiln

A technology of activated lime and roasting process, applied in the direction of lime production, can solve the problems of easy blockage of flue gas, large exhaust gas emission, large energy consumption, etc., and achieve the effect of reducing energy consumption, improving thermal efficiency, and reducing production costs

Active Publication Date: 2013-07-31
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method produces a large amount of exhaust gas, and the flue gas in the kiln is prone to blockage, which consumes a lot of energy and has certain safety hazards.

Method used

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  • Roasting process for active lime in rotary kiln

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment provides a roasting process for active lime in a rotary kiln. When roasting active lime, only the preheated converter gas is used for heating and roasting in the rotary kiln, and the gas flow rate of the converter gas is 20000~250,000m 3 / h, preheating temperature is 250℃, pressure is greater than 3.5kPa, heating value is 1600~1800kcal / m 3 . And the inner diameter of the rotary kiln is 4.7m, the length is 68m, the temperature of the rotary kiln head is 600~800℃, and the pressure of the kiln head is -10~-50Pa.

[0014] The specific process method is:

[0015] According to the structure of the rotary kiln process equipment, the area of ​​the preheater is large, the rotary kiln is long, and the roasting time is long. If the fuel of low heating value converter gas is used alone, the following aspects can be considered: (1) Increase the roasting time; ( 2) Control the gas pressure, 0.03-0.04MPa is appropriate; (3) Control the appropriate flue gas temperature, and ...

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Abstract

The invention discloses a roasting process for active lime in a rotary kiln. When active lime is being roasted, only preheated converter gas in the rotary kiln is used for heating and roasting, and converter gas flow is 20,000 to 250,000 m<3> / h. According to the roasting process for active lime in the rotary kiln in the invention, mixed roasting with converter gas and blast-furnace gas is replaced by roasting with preheated converter gas, which enables production cost for active lime to be effectively lowered down, pollution to the environment to be reduced, thermal efficiency of the rotary kiln to be improved, stability of thermal regulation in the rotary kiln to be ensured, consumption of energy to be decreased and quality to be guaranteed.

Description

Technical field [0001] The invention relates to a roasting process for active lime, and more specifically, to a process for roasting active lime by using converter gas. Background technique [0002] The raw material specification used in the lime plant is 20-50mm limestone (CaCO 3 ) And 30~60 dolomite (MgCO 3 ), the raw materials are conveyed by the belt into the silo at the top of the preheater, and then the limestone is distributed into the vertical preheater by the discharge pipe. After the limestone enters the preheater, it is preheated by the exhaust gas at about 1100 ℃ at the kiln tail. 30% of the limestone is decomposed in the preheater. The preheated material is pushed by the hydraulic push rod and enters the rotary kiln through the rotating chute. The material is roasted and decomposed at 1200~1350℃ in the rotary kiln, and the hot exhaust gas enters the preheating After preheating the limestone, the exhaust gas is discharged into the atmosphere by the smoke exhauster aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10
CPCY02P40/40
Inventor 唐烨肖松峰冯源黄卫兵吴立峰付涛刘宁波
Owner JIANGSU YONGGANG GROUP CO LTD