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System and method for calcining cement clinker through lignite safely in large amount

A technology for cement clinker and lignite, applied in separation methods, chemical instruments and methods, inert gas generation, etc., can solve the safety hazards of grinding lignite, the existence of explosion safety hazards, and reduce nitrogen oxide emissions. performance, improve safety, and reduce the chance of spontaneous combustion of pulverized coal

Active Publication Date: 2015-02-04
海拉尔蒙西水泥有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature adjustment is realized by adjusting the cold air valve, which will lead to an increase in the oxygen content of the system and provide conditions for the coal dust explosion. Therefore, the existence of the cold air valve is an important safety hazard for grinding lignite
(3) The dust removal of the pulse bag filter adopts compressed air to clean the dust. There is an instantaneous pulse bag filter where the local oxygen content reaches the oxygen content required for the coal dust explosion, and there is an explosion safety hazard.
At present, there is no technology suitable for the cement industry to reduce nitrogen oxide emissions at home and abroad

Method used

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  • System and method for calcining cement clinker through lignite safely in large amount
  • System and method for calcining cement clinker through lignite safely in large amount
  • System and method for calcining cement clinker through lignite safely in large amount

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Embodiment 1

[0025] Embodiment 1: A system for calcining cement clinker using lignite, which includes a raw coal grinding system at the kiln head and a raw coal grinding system at the kiln tail.

[0026] The kiln head raw coal grinding system includes a kiln head coal storage yard 1, a kiln head coal raw coal bunker 2, a clinker grate cooler 3, a kiln head coal quantitative feeder 4, a standard configuration mill 5, and a kiln head coal mill Pulse bag filter 6, kiln head coal powder warehouse 7, kiln head coal powder scale 8, kiln head burner 9, kiln head coal mill exhaust fan 10 and kiln head carbon dioxide explosion-proof device 29; kiln head coal storage yard 1 passes through the conveyor belt It is connected with the inlet of kiln head raw coal bunker 2, the outlet of kiln head coal raw coal bunker 2 is connected with the inlet of kiln head coal quantitative feeder 4, and the outlet of kiln head coal quantitative feeder 4 is in line with the standard The feed port of the configuration ...

Embodiment 2

[0028] Embodiment 2: A method of using lignite to calcinate cement clinker. After grinding bituminous coal or anthracite through the kiln head raw coal grinding system, add it to the kiln head burner 9 as coal for the rotary kiln 27; After the pulverized coal is pulverized, it is added to the kiln tail burner 26 as coal for the calciner 28 .

[0029] Wherein, grinding lignite with the kiln tail raw coal grinding system specifically includes the following steps: (1) sending the lignite in the kiln tail coal raw coal bunker 15 into the special mill at 15-22 tons per hour through the kiln tail coal quantitative feeder 16 Grinding in the machine 17; during the start or stop of the special mill 17, by adjusting the coal feed rate of the kiln tail coal quantitative feeder 16, ensure that the gas temperature at the outlet of the special mill 17 is within the range of 45-70°C; Adjust the hot air valve between the high temperature fan 20 and the kiln tail coal mill cyclone dust collect...

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Abstract

The invention discloses a system and a method for calcining a cement clinker through lignite safely in a large amount. The system includes a kiln head raw coal grinding system and a kiln tail raw coal grinding system. The kiln head raw coal grinding system is connected to a kiln head burner and the kiln tail raw coal grinding system is connected to a kiln tail burner. The method includes following steps: (1) grinding bituminous coal or anthracite through the kiln head raw coal grinding system and adding the grinded bituminous coal or anthracite to the kiln head burner for employing the grinded bituminous coal or the anthracite as coal used in rotary kiln; and (2) grinding the lignite through the kiln tail raw coal grinding system and adding the grinded lignite to the kiln tail burner for employing the grinded lignite as coal used in decomposing furnace. The system and the method are advantaged in that the lignite is used for calcining the cement clinker in a large amount so that a production cost is greatly reduced. By means of the method, nitrogen oxide generated during calcination of the cement is greatly reduced. By means of a CO2 explosion-proof device, fire can be extinguished and prevention of explosion is actually achieved. Possibility of fresh air entering the system is reduced since a cold air valve is removed, thereby improving safety.

Description

technical field [0001] The invention relates to a system and method for calcining cement clinker, in particular to a system and method for calcining cement clinker by using lignite in large quantities and safely. Background technique [0002] Coal is the most important energy source for the production of new dry process cement, which plays the role of both fuel and raw material. The use of coal in the firing system is divided into two parts, one part is coal for calciner, accounting for about 60% of the total coal consumption of the system ; Part of the coal used by the rotary kiln accounts for about 40% of the total coal consumption of the system. Cement production is an energy-intensive industry. With the reduction of coal resources and the aggravation of energy shortage, new dry process coal resources are getting less and less, and the price is getting higher and higher, which seriously restricts the production of new dry process cement. According to statistics, energy T...

Claims

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Application Information

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IPC IPC(8): C04B7/44B01D46/04B01J19/14
Inventor 志宏赵雄慧卢志毅郭海山马廷文崔永军徐祗萍
Owner 海拉尔蒙西水泥有限公司
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