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Process for preventing cement clinker produced from high-sulfur raw material from skinning

A technology of cement clinker and high-sulfur raw meal, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problem of excessive heat loss, not paying attention to air flow, and can not solve the problem of SO2 emission well, etc. problem, to achieve the effect of reducing heat loss and improving absorption effect

Inactive Publication Date: 2012-10-10
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the temperature of waste heat of flue gas after dehydration of coal gangue is already very low. Although the waste heat is reused in the preheating system, too much heat is lost, which does not meet the requirements of energy-saving and environmental protection cement kiln design.
However, no attention was paid to the SO in the gas stream 2 The question, therefore, is not well addressed by SO 2 emissions problem

Method used

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  • Process for preventing cement clinker produced from high-sulfur raw material from skinning
  • Process for preventing cement clinker produced from high-sulfur raw material from skinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The cement clinker production system applied by the process of the present invention includes a precalcining kiln, a bypass air release system (including a calcium carbide slag dust generating device 3, a high and low temperature gas mixer 2, a cyclone 6 and an air release pipeline), and cement raw meal Four-stage preheating system.

[0018] Such as figure 2 As shown, a stream of flue gas with a temperature of 1000°C drawn from the precalcining kiln 1 enters the high and low temperature gas mixer 2 along the air release line 8. There is low temperature calcium carbide slag on the side of the high and low temperature gas mixer 2 The dust is introduced from the pipeline 9 and is formed by uniformly mixing the air entering the calcium carbide slag dust generator 3 through the air inlet pipe 7 and the calcium carbide slag powder sprayed from the nozzle 4 under the action of the agitator. After the high and low temperature gases meet in the high and low temperature gas mixer ...

Embodiment 2

[0021] The implementation device is the same as in Example 1.

[0022] The raw meal fed into the cement kiln contains low content of sulfur, chlorine, and alkali elements (not exceeding the national standard on cement raw meal sulfur, chlorine, and alkali elements), so the precalciner (1) air discharge rate is selected as a lower Ratio (15%), the amount of low-temperature gas passing into the high-low-temperature gas mixer (2) is appropriately reduced (low-temperature gas / high-temperature gas=1 / 3), and the concentration of calcium carbide slag dust is 4%.

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Abstract

The invention discloses a process for preventing a cement clinker produced from a high-sulfur raw material from skinning, which comprises the steps of: introducing high-temperature smoke from a predecomposition kiln and low-temperature carbide slag dust from a carbide slag dust generating device into a high-low temperature smoke mixer for mixing and removing sulfur; enabling a sulfur removed mixed gas to enter a cyclone separator again, eccentrically separating most of sulfur removed dust containing chlorine and alkali to obtain purer smoke; and enabling the purer smoke to enter a four-level preheating system of a cement clinker producing system to be used as a heat source of a preheater for producing the cement clinker. In the process, by using the alkalinity and the low-temperature characteristic of the carbide slag dust, the smoke temperature and the content of harmful substances are effectively reduced, especially, substances containing sulfur, chlorine and alkali in the smoke areremoved.

Description

Technical field [0001] The invention relates to a cement kiln anti-skinning process, in particular to an anti-skinning process of a pre-decomposition system in the process of producing clinker with high-sulfur raw meal. technical background [0002] The pre-decomposition system is a commonly used equipment in the current dry-process cement kiln production process, and its application improves the quality of cement clinker firing. However, it also brings some disadvantages. After entering the pre-decomposition system, the high-volatility dust generated by the high-sulfur and chlorine-containing raw meal under the high temperature condition of the rotary kiln will quickly drop to the crust temperature (800℃-1000℃). ), in the precalcining kiln wall and pipelines, consolidation and blockage, resulting in skinning. In the actual production process, a part of the highly volatile dust is usually discharged by bypassing the air to reduce the risk of skin formation. The air outlet is oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/83B01D53/50C04B7/43
Inventor 汪美贞冯华军陈应强沈东升宋二喜张弛廖燕
Owner ZHEJIANG GONGSHANG UNIVERSITY