Low heat value gas oxygen-enriched burning process in rotary lime kiln

A low calorific value gas and lime rotary kiln technology, applied in the field of lime rotary kiln combustion, can solve the problems of high calorific value gas shortage, excess, affecting lime quality and output, etc., achieve far-reaching economic and social benefits, accelerate decomposition speed, and broad development foreground effect

Active Publication Date: 2007-03-21
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the surplus of a large amount of low calorific value gas in my country's iron and steel enterprises, and with the increase of fuel prices and the limitation of the country's coke production, the coke oven gas volume has also been affected to a certain extent, and it is difficult to guarantee the consumption of coke oven gas for civil use. The fuel used by some enterprises also adopts coke oven gas instead of oil, resulting in a serious shortage of high calorific value gas such as coke oven gas, while a large amount of low calorific value gas such as converter gas and blast furnace gas is relatively surplus
Due to calorific value and other reasons, when these low calorific value gas is used in lime calcination kilns, especially in rotary kilns, the calcination temperature cannot fully meet the process requirements, thus affecting the quality and output of lime

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A lime plant uses a 600t / d rotary kiln to calcine lime, and the heat value used is 1747.5×4.18kJ / m N 3 Low calorific value gas, and increase the oxygen content in the combustion air, so that the oxygen content in the combustion air is 23.4%. The combustion-supporting air is divided into primary air and secondary air. The primary air participates in rapid combustion and maintains the shape of the flame; the secondary air is mainly used to cool the lime and participate in combustion after being heated. 900m required N 3 / h After the pure oxygen is pressurized by the pressurizer, 70% of its total amount is sent to the pipe at the air outlet of the primary fan to inject air. After the oxygen and air are fully mixed in the primary air pipe, they are sent to the burner to participate in combustion In this way, the oxygen content in the primary air is increased, so that the oxygen content in the primary air is 33.1%, so that the high temperature area in the kiln is concentr...

Embodiment 2

[0011] A lime plant uses a 600t / d rotary kiln to calcine lime, and the heat value used is 1800×4.18kJ / m N 3 Low calorific value gas, and increase the oxygen content in the combustion air, so that the oxygen content in the combustion air is 23.2%. 800m required N 3 After the pure oxygen per hour is pressurized by the pressurizer, 80% of its total amount is sent to the pipe at the air outlet of the primary fan, and after being fully mixed with the air in the primary air pipe, it is sent to the burner to participate in combustion; the remaining 20% The oxygen is sent to the pipeline at the air outlet of the secondary fan and mixed with air in the secondary air pipeline, and then sent to the kiln to participate in combustion, so that the calcination temperature is increased to above 1350 ° C, which meets the requirements of the rotary kiln for lime calcination temperature .

Embodiment 3

[0013] A lime plant uses a 600t / d rotary kiln to calcinate lime, and the heat value used is 2000×4.18kJ / m N 3 Low calorific value gas, and increase the oxygen content in the combustion air, so that the oxygen content in the combustion air is 23%. 750m required N 3 After the pure oxygen per hour is pressurized by the pressurizer, 90% of its total amount is sent to the pipe at the air outlet of the primary fan, and after being fully mixed with the air in the primary air pipe, it is sent to the burner to participate in combustion; the remaining 10% The oxygen is sent to the pipeline at the air outlet of the secondary fan and mixed with air in the secondary air pipeline, and then sent to the kiln to participate in combustion, so that the calcination temperature is increased to above 1350 ° C, which meets the requirements of the rotary kiln for lime calcination temperature .

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Abstract

The oxygen-enriched low heat value gas burning process in rotary lime kiln includes adopting low heat value gas of (1700-2000)x4.18 kJ/cu m, such as converter gas and coke oven gas, burning in oxygen-enriched air of oxygen content 23-25 % to reach over 100 deg.c higher calcining temperature, compressing oxygen in a compressor and blending oxygen into the comburant air for burning, and increasing the oxygen content to reinforce burning, concentrate high temperature area and speed the decomposition of limestone.

Description

technical field [0001] The invention relates to a lime rotary kiln combustion technology, in particular to a lime rotary kiln low calorific value coal gas oxygen-enriched combustion process. Background technique [0002] Due to the surplus of a large amount of low calorific value gas in my country's iron and steel enterprises, and with the increase of fuel prices and the limitation of the country's coke production, the coke oven gas volume has also been affected to a certain extent, and it is difficult to guarantee the consumption of coke oven gas for civil use. The fuel used by some enterprises has also been changed from oil to coke oven gas, resulting in a serious shortage of high calorific value gas such as coke oven gas, while a large amount of low calorific value gas such as converter gas and blast furnace gas is relatively surplus. Due to calorific value and other reasons, when these low calorific value gas is used in lime calcination kiln...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
Inventor 杨耕桃王洪涛王海波靳凯潘中伟
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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