Device and method for cooling clinker by liquid oxygen and liquid nitrogen of cement kiln

A technology of cement kiln and liquid oxygen, which is applied to the device for strengthening the combustion of the preheating decomposition system of the rotary kiln, and the device for cooling the clinker by using liquid oxygen and liquid nitrogen in the cement kiln. It can solve the problem of unstable cooling effect, affecting the quality of cement products, Large cooling energy consumption and other issues

Active Publication Date: 2014-08-06
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the rotary kiln clinker in the middle temperature section of the grate cooler also needs to solve the C 2 The problem of crystal transformation of S, especially in the production of high C 2 For S clinker products, it is more necessary to use rapid cooling to make the clinker quickly pass through the crystal transformation temperature range, so the cement kiln is equipped with a

Method used

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  • Device and method for cooling clinker by liquid oxygen and liquid nitrogen of cement kiln
  • Device and method for cooling clinker by liquid oxygen and liquid nitrogen of cement kiln
  • Device and method for cooling clinker by liquid oxygen and liquid nitrogen of cement kiln

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Embodiment 1

[0031] A device for cooling clinker in a cement kiln using liquid oxygen and liquid nitrogen, such as figure 1 and figure 2 As shown, the cement kiln grate cooler 1 is included, and the high-temperature clinker 2 of the cement kiln falls into the cement kiln grate cooler after coming out of the rotary kiln 3. The cement kiln grate cooler is sequentially provided with a high temperature cooling zone 1-1, a medium temperature Cooling zone 1-2 and low-temperature cooling zone 1-3, the high-temperature clinker is transferred to the next process section after passing through the high-temperature cooling zone, medium-temperature cooling zone and low-temperature cooling zone. Zones are respectively provided with air-cooled blowers 4 and 5, on the output pipeline 4-1 of the air-cooled blower in the high-temperature cooling zone, a liquid oxygen input interface 6 is arranged, and in the output pipeline 5-1 of the air-cooled blower in the medium-temperature cooling zone A liquid nitro...

Embodiment 2

[0039] A method for cooling clinker by using liquid oxygen and liquid nitrogen in a cement kiln is a method for cooling clinker by using liquid oxygen and liquid nitrogen based on the device described in Example 1, and the method is in the high temperature section of the cement kiln grate cooler The cooling air sent by the blower contains liquid oxygen of 1% to 12% of the total air volume, and the cooling air sent by the blower in the middle temperature section of the cement kiln grate cooler contains liquid nitrogen of 1% to 45% of the total air volume.

[0040] In an embodiment, the method further includes:

[0041] a. After the cement kiln is running normally, open the liquid oxygen delivery channel. In the middle of the high temperature section of the grate cooler, when the gas temperature is higher than 1150°C, increase the cooling air flow sent by the blower, and the cold air flow contains total Air volume of 1% to 12% liquid oxygen, adjust the content of liquid oxygen t...

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Abstract

The invention discloses a device and a method for cooling clinker by liquid oxygen and liquid nitrogen of a cement kiln. The device is characterized in that a high-temperature cooling region of a grate cooler of the cement kiln is provided with a liquid oxygen input connector, and a middle-temperature cooling region of the grate cooler is provided with a liquid nitrogen input connector. The method comprises the steps of adding liquid oxygen the volume of which is 1%-12% of the total volume of cooling air fed by an air blower of a high temperature section of the grate cooler of the cement kiln, and adding liquid nitrogen the volume of which is 1%-45% of the total volume of cooling air fed by an air blower of a middle temperature section of the grate cooler of the cement kiln. The device and the method provided by the invention have the advantages that the cooling rate of clinker is improved by inputting liquid oxygen, and high-temperature clinker is cooled suddenly, so that the decomposition of D3S at 1250 DEG C is prevented or alleviated, the crystallization of MgO is prevented or alleviated, and the stability of the clinker is improved; a C3S crystal is prevented from growing, and thus the grindability of clinker is improved; the C2S crystal transfer is effectively prevented or alleviated by introduced liquid nitrogen.

Description

technical field [0001] The invention relates to the field of oxygen-enriched combustion in cement kilns, in particular to a device and method for cooling clinker by using liquid oxygen and liquid nitrogen in a cement kiln. Combustion apparatus and methods. Background technique [0002] Oxygen-enriched combustion refers to combustion in oxygen-enriched air with a higher oxygen concentration than air (20.9% oxygen): it is a highly efficient and energy-saving combustion technology, and it is used in the glass industry, metallurgical industry and thermal engineering fields. Usually there is only 20.9% oxygen in the air. When the fuel is burned in air, the calorific value will be reduced due to lack of oxygen, resulting in energy waste: when the oxygen concentration of coal (including oil products and natural gas) is 26% to 31%, the best combustion efficiency is obtained. . The mechanism of oxygen-enriched combustion is to send high-concentration oxygen into the combustion equi...

Claims

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Application Information

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IPC IPC(8): F27D15/02F25D3/10C04B7/47
CPCY02P40/121
Inventor 陈晓东郝利炜顾军谌玉双熊运贵户宁
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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