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Sulfur oriented adsorption control method for active calcarea lime calcination in rotary kiln

A technology of active lime and adsorption control, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., to achieve the effects of simple sulfur whereabouts, strong practicability, and low sulfur emissions

Inactive Publication Date: 2008-12-24
山西玉竹活性石灰制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of a certain amount of sulfur during coal calcination, the lime will absorb the sulfur in the combustion products during the calcination process, and the presence of sulfur in active lime is a very fatal quality for active lime except for its activity. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the calcining chamber is a relatively closed rotary kiln, the mixture of pulverized coal and fine powder of active lime is sprayed into the rotary kiln through a four-channel burner for combustion. During the combustion of pulverized coal, sulfur-containing Flue gas, at this time, the active lime powder particles can quickly and directionally absorb more than 70% of the sulfur brought in by the coal powder in the flue gas at the first time; according to the calcination requirements of the active lime, the injection amount of the coal powder should be well controlled , so that the temperature of the rotary kiln is controlled within the range of 1100-1150 ° C and kept stable; the active lime powder particles that absorb a large amount of sulfur fall into the kiln dust of the rotary kiln, and the kiln dust is separated from the block active limestone by screening, The active lime block material with high activity and low sulfur content can be obtained, and the active lim...

Embodiment 2

[0023] Except that the blending amount of active lime fine powder is 5% of the coal powder quality, other is the same as embodiment 1.

[0024] The indicators of the high activity and low sulfur content active lime block material are: the activity degree of the block active lime is ≥ 375ml, the S content is ≤ 0.015%, and the CaO is ≥ 90%.

Embodiment 3

[0026] Except that the blending amount of active lime fine powder is 8% of coal powder quality, other is the same as embodiment 1.

[0027] The indicators of the high activity and low sulfur content active lime block material are: the activity degree of the block active lime is ≥ 375ml, the S content is ≤ 0.012%, and the CaO is ≥ 90%.

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Abstract

The invention provides a sulfur oriented adsorption control method for calcining active lime in a rotary kiln comprising the following steps: the rotary kiln calcines the massive limestone using the mixture of the coal fines and active lime fine silts as fuels, the sulfur in the flue gas is adsorbed using the sulfur adsorption and desulphurizing ability of the active lime fine silts, meanwhile the sulfur-adsorbed kiln dust is separated from the calcined active lime by means of screening to get low sulfur-content active lime. The method can adsorb more than 70% of sulfur brought by the coal fines using the active lime fine silts, and separate the large amount of adsorbed sulfur from the massive active limestones by means of screening to get active lime bricks which are high active and low sulfur content. The method controls the sulfur trace in the flue gas, which is simple, practical and reliable. The method also has advantages of good quality of the active limestone, high efficiency, low sulfur emission and pollution.

Description

technical field [0001] The invention relates to the technical field of calcined active lime in a rotary kiln, in particular to a method for controlling directional adsorption of sulfur in active lime calcined in a rotary kiln. Background technique [0002] The activity and sulfur content of active lime for metallurgy are closely related to its production, production process and quality control methods. The activity of lime depends largely on the calcination equipment used for calcination. There are two methods of calcined limestone production: [0003] A traditional shaft kiln production method using lump coal or pulverized coal as fuel. Due to the influence of the equipment structure and combustion method of the vertical kiln, it is difficult to achieve a uniform temperature in the kiln, and the overall firing temperature in the kiln is low, and raw burning often occurs, resulting in low activity of calcined lime. Therefore, it has a great influence on the firing quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10B01D53/02
Inventor 谢峻林何峰梅书霞金明芳
Owner 山西玉竹活性石灰制造有限公司
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