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Lime kiln and control method thereof

A kiln chamber and gas technology, applied in the lime kiln field, can solve the problems of single fuel type and poor production adaptability

Active Publication Date: 2020-10-30
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides a lime kiln and its control method to solve the problem of single type of fuel in the lime kiln and poor production adaptability

Method used

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  • Lime kiln and control method thereof
  • Lime kiln and control method thereof
  • Lime kiln and control method thereof

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Embodiment 1

[0077] In the first embodiment, the mutually independent gas supply device 1 and the pulverized coal supply device 2 share a set of spray gun groups composed of N spray guns 5. When coal gas is used for heating with priority, when the gas pressure is too low due to large gas fluctuations, It is possible to determine whether to switch some of the N spray guns to pulverized coal fuel by detecting the pressure of the gas ring pipe and the internal pressure of the kiln, and obtain the position of the spray gun for switching the pulverized coal fuel and the number of spray guns N x , N x is less than the total number of spray guns N, so as to realize the composite and uniform heating of the two fuels. The specific implementation method can refer to other patent documents submitted on the same day as this application, and will not be repeated in this application specification. This gas-coal composite heating mode not only requires that the fuel of N spray guns can be switched synchr...

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Abstract

The invention discloses a lime kiln and a control method thereof. The lime kiln comprises an online fuel switching system, and the online fuel switching system comprises a coal gas supply device, a pulverized coal supply device, N fuel switchers and N spray guns; when fuel of all the spray guns is switched from pulverized coal to coal gas, valve bodies at pulverized coal inlets in the fuel switchers and a pulverized coal stop valve are sequentially closed, and a pulverized coal conveying fan is adjusted to be in a standby state; the operation frequency of a coal gas conveying fan is improved,after the coal gas air pressure meets the kiln entering requirement, a coal gas stop valve and the valve bodies at coal gas inlets in the fuel switchers are sequentially opened, and coal gas sequentially passes through a coal gas conveying pipeline, a coal gas ring pipe, coal gas inlets and fuel outlets of the N fuel switchers and the N spray guns and flows into a kiln chamber; and a combustion-supporting air stop valve is opened, the operation frequency of a combustion-supporting fan is adjusted, the combustion-supporting air volume is matched with the coal gas volume, and the switching process is finished. According to the lime kiln and the control method thereof, the defects that lime kiln fuel is single in type and poor in production adaptability are overcome, and lime kiln coal gas / pulverized coal online switching is achieved.

Description

technical field [0001] The present application relates to the field of lime kiln technology, in particular to a lime kiln and a control method thereof. Background technique [0002] The lime kiln is the core equipment in the lime production process. The limestone raw material is heated to 1100°C in the lime kiln and calcined to produce lime products. The fuel used for limestone calcination usually includes gas and coal powder. Due to the different combustion characteristics of gas and pulverized coal, the type of fuel used in a specific lime kiln is fixed. [0003] Since the existing lime kiln can only use one of coal gas or pulverized coal fuel, if the type of fuel needs to be changed, the heating system of the lime kiln can only be modified, and the flexibility is very poor. In addition, for lime kilns built in iron and steel plants, gas is a by-product of ironmaking and steelmaking processes. Although the cost is low, the supply is not stable. The gas volume and calorifi...

Claims

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Application Information

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IPC IPC(8): F27D19/00C04B2/10
CPCF27D19/00C04B2/10F27D2019/0075
Inventor 刘前周浩宇
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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