Double-hearth lime kiln with gas and coal mixed combustion

Abstract

The invention discloses a double-hearth lime kiln with gas and coal mixed combustion. The double-hearth lime kiln with gas and coal mixed combustion comprises a first kiln hearth and a second kiln hearth, wherein spray gun circular pipes, coal gas circular pipes and nitrogen gas circular pipes are connected with hearth body outer walls of both the first kiln hearth and the second kiln hearth, thespray gun circular pipes and the coal gas circular pipes are communicated with the nitrogen gas circular pipes separately, the spray gun circular pipes are further connected with a fan, the coal gas circular pipes and a coal gas pressuring machine are connected, the nitrogen gas circular pipes and a nitrogen supply device are connected, multiple spray guns are connected with hearth body inner walls of both the first kiln hearth and the second kiln hearth, the spray guns comprise spray gun main pipes, the spray gun main pipes are connected with coal gas branch pipes, cooling air branch pipes and coal powder branch pipes, the coal powder branch pipes and a coal powder distributor are connected, and the coal gas branch pipes and the cooling air branch pipes on both the first kiln hearth and the second kiln hearth are communicated with the coal gas circular pipes and the spray gun circular pipes on the corresponding kiln hearths. By means of the double-hearth lime kiln with gas and coal mixed combustion, mixed combustion of coal gas and coal powder can be effectively achieved, the diversity of lime kiln fuel mediums is achieved, the utilization rate of the lime kiln is improved, and the utilization rate of the low-heating value coal gas is improved.

Description

technical field [0001] The invention relates to the technical field of lime kilns, in particular to a lime kiln with double chambers for mixed combustion of gas and coal. Background technique [0002] Existing double-chamber lime kilns generally use separate coal gas or coal powder as the fuel medium to calcine lime. For lime kilns that use coal gas alone as the dye medium, low calorific value gas cannot be fully used. For lime kilns that use coal powder as the fuel medium, a large amount of coal powder is consumed, and the production cost is high. Therefore, the existing double-chamber lime kiln has a single fuel medium, and the utilization rate of low calorific value gas is low, and the lime kiln The utilization rate is also low, unable to meet production demand. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a gas-coal mixed-fired double-chamber lime kiln, which can effectively realize the dual-fuel mixed co...

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Problems solved by technology

[0002] Existing double-chamber lime kilns generally use separate coal gas or pulverized coal as the fuel medium to calcine lime. For lime kilns that use coal gas alone as the dye medium, low calorific value gas cannot be fully used. For lime kilns that use coal powder as the fuel medium, a large amount of coal powder is consumed, and the production cost is high. Therefore, the existing double-chamber lime kiln has a single fuel medium, and the utilization rate of low calorific value gas is low, and the lime kiln The utilization rate is also low and cannot meet the production demand

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