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Method for roasting cement clinker through sulphur coal by dry-process rotary kiln

A technology of dry rotary kiln and cement clinker, applied in the field of cement production

Inactive Publication Date: 2013-05-08
CHONGQING XIUSHAN SOUTHWEST CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to propose a method for calcining cement clinker with high-sulfur coal in a dry-process rotary kiln, so as to solve the adverse effects caused by the use of sulfur in coal-fired coal in a dry-process rotary kiln, so as to broaden the scope of coal-fired use in a dry-process rotary kiln

Method used

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  • Method for roasting cement clinker through sulphur coal by dry-process rotary kiln
  • Method for roasting cement clinker through sulphur coal by dry-process rotary kiln
  • Method for roasting cement clinker through sulphur coal by dry-process rotary kiln

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Embodiment Construction

[0012] The following is the concrete improvement and analysis of the inventive method:

[0013] 1, the present invention uses industrial analysis and ash content of high-sulfur coal:

[0014] Industrial analysis and total sulfur content of high sulfur coal:

[0015]

[0016] Analysis of coal ash chemical composition:

[0017]

[0018] 2. Improvement of batching scheme of the present invention

[0019] Generally, the harmful components such as alkali and chlorine in the cement raw materials used in the production plant are relatively high. The alkali content in the clinker is 1.0-1.5%, the chlorine content is about 0.05%, the SO3 content is between 2.5-3.5%, and the sulfur-alkali ratio is 1.0. Between -1.40. In order to be able to adapt to burning high-sulfur coal, we need to adjust the raw material ingredients, using the ingredients with medium saturation ratio, medium-low silicic acid rate, and high alumina rate: KH: 0.90±0.02, N: 2.5±0.1, P : 2.0±0.1. In order to ...

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Abstract

The invention provides a method for roasting a cement clinker through sulphur coal by a dry-process rotary kiln. The method comprises the following steps of: (1) preparation of raw materials: the material preparation scheme of intermediate saturation ratio, intermediate-low silica modulus and high aluminum-oxygen modulus is adopted, and the materials are that 0.90+ / -0.02 of KH, 2.5+ / -0.1 of N, and 2.0+ / -0.1 of P; and the raw materials comprise 84% of limestone, 4% of high siliceous shale, and 12% of siliceous shale; and (2) roasting of clinker: the sulphur coal is adopted and used as the fire coal and contains 7.0 to 8.0% of sulphur content and 12 to 15% of volatile matter; the air inlet angle of a coal-injection duct of the rotary kiln is set to 34 degrees, the inner air opening is in a full opening state, the outer air opening degree is set to reach 50 to 70%, the throat of a smoke chamber is set to reach 1100mm; when in roasting, the temperature of an outlet of a decomposing furnace is controlled to 860 to 880 DEG C, the temperature of the smoke chamber is controlled to reach 950 to 1050 DEG C, and the rotation speed of the rotary kiln is controlled to more than 3.8 revolutions per minute at the same time; the crust on the smoke chamber is removed twice every eight hours in each shift during roasting, as well as removing the crust on a gooseneck of the decomposing machine every 12 hours. According to the method, the total sulfur in the fire coal for the dry-process rotary kiln is expanded to reach 7.0 to 8.0%, the qualified clinker can be normally roosted, and no influence is brought to the output and the quality.

Description

technical field [0001] The invention relates to a cement production method, in particular to a method for calcining cement clinker in a dry rotary kiln. Background technique [0002] In the dry-process rotary kiln calcined cement, the coal-fired coal used in the dry-process rotary kiln generally requires the total sulfur to be below 2.0%, otherwise it is easy to grow rings and crusts, which seriously affects the normal production of the new dry-process rotary kiln. [0003] As we all know, sulfur is a harmful component, and alkali sulfate is a eutectic mineral, which will increase the amount of liquid phase, and the liquid phase viscosity is small. The use of high-sulfur coal (sulfur content greater than 3%) is prone to crusting, ringing, large lumps, Phenomena such as take-off sand will seriously block the preheater, and the rotary kiln will have thick kiln skin and ring formation, which will affect production and be difficult to deal with. Especially when the harmful comp...

Claims

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Application Information

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IPC IPC(8): C04B7/43C04B7/34
Inventor 江传胜董希良昝旭东宋杰管俊之鲍四毛张国祥
Owner CHONGQING XIUSHAN SOUTHWEST CEMENT
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