Method for calcination of chamotte in rotary cement kiln with coal gas as fuel

A cement rotary kiln and rotary kiln technology, applied in cement production, clinker production, rotary drum furnace, etc., can solve problems such as gas surplus, reduce gas emissions, reduce environmental pollution problems, and improve energy efficiency.

Inactive Publication Date: 2008-06-11
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of excess gas in the metallurgical production process, the purpose of the present invention is to provide a process for calcining clinker with gas as fuel in a cement rotary k...

Method used

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  • Method for calcination of chamotte in rotary cement kiln with coal gas as fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: An equipment for calcining clinker in a cement rotary kiln using coal gas as fuel

[0031] This embodiment is shown in Figure 1, including: rotary kiln 5, five-stage cyclone tube 8, kiln tail smoke chamber 6, burner 4, cooler 9; The smoke chamber 6 communicates with the five-stage cyclone tube 8, and the kiln tail smoke chamber 6 is connected with the calciner 7; the kiln head of the rotary kiln 5 is provided with a burner 4, and the air inlet of the burner 4 is connected with a gas pipeline 1; the rotary kiln 5 The discharge end of the kiln head is provided with a clinker cooler 9. The gas pipeline 1 is connected with a flow control valve 3 and a gas regulator cabinet 2, the burner 4 is a gas burner, and the kiln tail smoke chamber 6 has slopes with angles of 55° and 45° connected in sequence.

[0032] The cooler 9 is connected with the kiln head 5, and is used for cooling the high-temperature clinker, and at the same time is responsible for heating the sec...

Embodiment 2

[0033] Example 2: A method for calcining clinker in a cement rotary kiln using coal gas as fuel

[0034] As shown in Figure 1, taking the 1000t / d new dry-process cement rotary kiln as fuel with coke oven gas as an example, the steps are as follows:

[0035] A. Transport the coke oven gas with large pressure fluctuations to the gas stabilizing cabinet 2 through the gas delivery pipeline 1, the gas stabilizes the pressure to 10KPa through the stabilizing cabinet 2, and adjusts the flow rate to 2.20-2.30Nm through the gas flow control valve 3 3 / s, the heat is equivalent to the gas flow rate of 40000~41000kJ / s, which is ignited by the burner 4 and sprayed into the 5 heads of the rotary kiln;

[0036]B. The raw meal after fully decomposing the carbonate in the production of new-type dry clinker is collected by the fifth-stage cyclone 8 of the five-stage cyclone 8, and sent through the fifth-stage cyclone 8 feeding pipe To the kiln tail smoke chamber 6, the raw material is b...

Embodiment 3

[0038] Example 3: A method for calcining clinker in a cement rotary kiln using coal gas as fuel

[0039] As shown in Figure 1, the steps are as follows:

[0040] A. The high-coke mixed gas with large pressure fluctuations is transported to the gas stabilizing cabinet 2 through the gas delivery pipeline 1. The gas stabilizes the pressure to 18KPa through the stabilizing cabinet 2, and adjusts the heat through the gas flow control valve 3 to be equivalent to 40000-41000kJ The gas flow rate of / s is ignited by the burner 4 and sprayed into the 5 heads of the rotary kiln;

[0041] B. The raw meal after fully decomposing the carbonate in the production of new-type dry clinker is collected by the fifth-stage cyclone 8 of the five-stage cyclone 8, and sent through the fifth-stage cyclone 8 feeding pipe To the kiln tail smoke chamber 6, the raw material is buffered into the tail of the rotary kiln 5 through the 55° and 45° slopes in the kiln tail smoke chamber 6, and under the acti...

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Abstract

The invention belongs to a manufacture technique of calcining cement clinker, in particular to a process of calcining cement clinker using coal gas as the heat source in rotary kiln. The manufacture technique includes a process of voltage stabilization and transformation of the coal gas, and a process of burning and heat calcinations of the coal gas in the rotary kiln. The invention is characterized in that the coal gas enters a burner through the coal gas pipe after the voltage is stabilized by a voltage stabilization cabinet and the flow capacity is adjusted by a control valve, then the coal gas is lit by the coal burner and sprayed in the rotary kiln. The coke-oven gas, blast furnace gas, converter gas and high coke mixed gas left in the process of metallurgy production can take place coal powder as fuel to calcine the cement clinker. The invention has the advantages that the manufacture technique can reduce environmental pollution caused by burning coal, increase the utilization ratio of the surplus gas in iron and steel companies, and reduce the exhaust of coal gas, thereby having good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the cement clinker calcining production technology, in particular to a method for calcining clinker in a cement rotary kiln using coal gas as fuel. Background technique [0002] At present, most of the cement clinker production in my country adopts the new dry process rotary kiln production technology. The new dry process cement rotary kiln firing system is mainly composed of four parts: suspension preheater, calciner, rotary kiln and cooler. Among them, the rotary kiln is the main equipment in clinker production, which undertakes the final firing task of cement clinker. At present, domestic new-type dry-process cement production lines use pulverized coal injection to calcine clinker in the rotary kiln. The main problems of this coal injection combustion method are: first, the thermal efficiency of coal combustion is low; The environmental pollution problem is serious. [0003] In the metallurgical process, a large amount of ...

Claims

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Application Information

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IPC IPC(8): C04B7/43F27D23/00F27D3/00F27B7/20F27D99/00
CPCY02P40/121
Inventor 孙庆亮刘智伟吕新锋孙进李艳青管山吉江丹
Owner LAIWU IRON & STEEL GRP
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