Converter gas and pulverized coal mixed combustion device

Abstract

The invention relates to the mixed gas combustion technology, in particular to a converter gas and pulverized coal mixed combustion device. The converter gas and pulverized coal mixed combustion device comprises a main air flue, a spraying nozzle and a passageway structure. A protective layer is arranged on the outer surface layer of the spraying nozzle, the main air flue is stabilized through supporting columns, and the passageway structure is connected with the spraying nozzle through a connecting piece. The passageway structure is composed of a central air flue, a pulverized coal passageway, a converter gas inlet, a rotational-flow air flue and an axial-flow air flue. One end of the axial-flow air flue is connected with the tail end of the main air flue, and the other end of the axial-flow air flue is connected with the position, close to the spraying nozzle, of the passageway structure. The pulverized coal passageway is arranged between the central air flue and the converter gas inlet. The central air flue is arranged at the tail end, opposite to the spraying nozzle, of the passageway structure and connected with the main air flue. The rotational-flow air flue is arranged on the portion, behind the converter gas inlet, of the passageway structure and connected with the main air flue. The combustion speed of a rotary kiln is broken through, the heat value is improved, the temperature of the head of the rotary kiln is raised, the temperature of the tail of the rotary kiln is lowered, and the pulverized coal conveying speed and the pulverized coal combustion speed are increased, and cost is reduced.

Description

technical field [0001] The invention relates to a mixed gas combustion technology, in particular to a mixed combustion device of converter gas and pulverized coal. Background technique [0002] With the continuous progress of society, people have higher and higher requirements for the environment. The country vigorously cracks down on the use of heavy pollution and high energy consumption equipment. At the same time, enterprises are also doing research on how to reduce energy consumption, reduce production costs, and reduce environmental pollution, and The firing of lime has been changed from traditional firing method to lime rotary kiln firing. [0003] The fuel of the lime rotary kiln is mixed gas, that is, the co-combustion of coke oven gas and converter gas. The calorific value of the two gases is low, which is a low calorific value gas; thus resulting in a low calorific value, only about 1700 calories. During calcination, due to the mixed combustion of coke oven gas an...

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Problems solved by technology

[0003] The fuel of the lime rotary kiln is mixed gas, that is, the co-combustion of coke oven gas and converter gas. The calorific value of the two gases is low, which is a low calorific value gas; thus resulting in a low calorific value, only about 1700 calories. During calcination, due to the mixed combustion of coke oven gas and converter gas, the combustion speed is slow and the flame is long, which makes the kiln head cannot be calcined normally; if only converter gas is used, the calcination temperature cannot meet the needs of lime production, and then The quality of the product cannot be guaranteed

Moreover, a large amount of low calorific value gas enters the rotary kiln, which cannot achieve complete combustion, which brings safety hazards to the kiln tail and increases production costs.

Moreover, in a social environment where resources are scarce and pollution is gradually aggravating, a large number of steelmaking enterprises release converter gas, which not only leads to waste of resources, but also aggravates environmental pollution

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