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Method for calcining limestone by using relaxed discharged gas of synthetic ammonia as fuel

A technology for calcining limestone and synthesizing ammonia, which is applied in gas fuel, fuel, lime production, etc., can solve the problems of increasing costs and achieve the effects of saving energy, improving product quality, and reducing costs

Inactive Publication Date: 2007-07-25
HUBEI YIHUA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Producer furnace gas needs to add a generator device, which also increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0007] The purge gas of synthetic ammonia with methane volume content of 20-30% and hydrogen volume content of 5-10% from 300m 3 The calcination layer of the gas-fired lime shaft kiln enters the kiln, and calcines the limestone with a qualified particle size that is fed into the kiln from the kiln top distributor. After cooling in the cooling section, the material is discharged from the kiln bottom to produce raw lime products. The effective calcium oxide content in the final product is 98%, and the raw and burnt rate is 5%. Raw burning rate: quality of incompletely calcined limestone / mass of raw limestone; overburning rate: quality of calcined limestone locally overheated limestone / mass of raw limestone.

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PUM

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Abstract

This invention discloses a method for calcining limestone by using the discharge gas from ammonia synthesis. The method utilizes the flammability of methane and hydrogen in the discharge gas to calcine limestone in limekiln and produce quick lime product. The method adequately utilizes the fuel resource of the discharge gas from ammonia synthesis, and has such advantages as reasonable process, and saved energy.

Description

technical field [0001] The invention relates to a fuel method for calcining limestone, in particular to a method for recovering the release gas of synthetic ammonia and using the release gas as fuel to calcine limestone to produce lime. Background technique [0002] The fuel enters the gas-fired lime kiln through the calcination layer, and calcines the limestone with a qualified particle size fed from the top of the kiln. After the calcination is completed, it is cooled by the cooling section and discharged from the bottom of the kiln. Currently, the fuels used in gas fired lime kilns include blast furnace gas, coke oven gas, calcium carbide furnace gas and producer gas. The ideal calorific value of gas in lime kiln is 1500-1800kcal / m 3 . The calorific value of blast furnace gas is low, 960-1010kcal / m 3 , and burn slowly. Coke oven gas has a high calorific value of 4000kcal / m 3 And it burns quickly as soon as it comes out of the burner, which will easily cause the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C10L3/00
CPCY02P40/40
Inventor 蒋远华王华雄杨晓勤冯加新何涛谷正凤陈性宏秦岭张元堂杨平郭华文
Owner HUBEI YIHUA GRP CO LTD
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