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Low-carbon low-emission sintering method based on coupled injection of multiple gases

A sintering method and low-emission technology, applied in the field of iron and steel metallurgy, can solve the problems of short residence time at high temperature, large heat storage, over-melting at sintering temperature, etc., and achieve the effects of increasing sintering output, improving the degree of reduction, and reducing NOX

Active Publication Date: 2019-12-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Insufficient heat storage in the middle and upper material layers, resulting in short high-temperature residence time, insufficient sintering, and insufficient liquid phase, resulting in low sinter strength and excessive ore return, while the lower material layer has large heat storage and excessive sintering temperature. High lead to over-melting, resulting in deterioration of sinter reducibility

Method used

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Examples

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Effect test

Embodiment 1

[0028] A method for intensified sintering of multi-type gas coupling injection of the present invention, under the conditions of 5.6% carbon content of the mixture, 1.85 binary basicity, 6.75% sintering moisture, and 700mm material layer height, the maximum temperature from the sintering material surface is The area between 1250°C and 1250°C is area I, the area between 1250°C and 1300°C is area II, and the area between 1300°C and 1350°C is area III. Under the sintering cup test with the same other conditions, the heat value injected into area Ⅰ is 35MJ / Nm 3 Gas with high calorific value, the calorific value injected into zone Ⅱ is 18MJ / Nm 3 medium calorific value gas, zone Ⅲ injected calorific value 11MJ / Nm 3 Low calorific value gas, and reduce the carbon content of the mixture to 5.15%. Sintering index, NO X , SO 2 and CO X The emission reductions are shown in Table 1.

Embodiment 2

[0030]A method for intensified sintering with multi-type gas coupling injection of the present invention, under the conditions of 5.6% carbon content of the mixture, 1.85 binary basicity, 6.75% sintering moisture, and 800mm material layer height, the maximum temperature from the sintering material surface is The area between 1250°C and 1250°C is area I, the area between 1250°C and 1300°C is area II, and the area between 1300°C and 1350°C is area III. Under the sintering cup test with the same other conditions, the heat value injected into area Ⅰ is 42MJ / Nm 3 The gas with high calorific value is injected into zone II with a calorific value of 25MJ / Nm 3 medium calorific value gas, zone Ⅲ injected calorific value 13MJ / Nm 3 Low calorific value gas, and reduce the carbon content of the mixture to 5.0%.

Embodiment 3

[0032] A method for intensified sintering of multi-type gas coupling injection of the present invention, under the conditions of 5.6% carbon content of the mixture, 1.85 binary basicity, 6.75% sintering moisture, and 900mm material layer height, the maximum temperature from the sintering material surface is The area between 1250°C and 1250°C is area I, the area between 1250°C and 1300°C is area II, and the area between 1300°C and 1350°C is area III. Under the sintering cup test with the same other conditions, the heat value injected into area Ⅰ is 50MJ / Nm 3 The gas with high calorific value is injected into the area II with a calorific value of 28MJ / Nm 3 medium calorific value gas, zone Ⅲ injected calorific value 13MJ / Nm 3 Low calorific value gas, and reduce the carbon content of the mixture to 4.85%.

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Abstract

The invention discloses a low-carbon low-emission sintering method based on coupled injection of multiple gases. Based on the difference of heat storage capacities of parts at the heights of differentmaterial layers, areas from thermal insulation completion to a waste gas temperature rising point of a material surface of a sintering machine are sequentially divided into a low heat storage capacity area, an intermediate heat storage capacity area and a high heat storage capacity area according to the temperature intervals smaller than 1250 DEG C, 1250-1300 DEG C and 1300-1350 DEG C, and high heating value gas with the injection heating value being larger than 30 MJ / Nm<3>, an intermediate heating value gas with the injection heating value being 15-30 MJ / Nm<3> and low heating value gas withthe injection heating value being smaller than 15 MJ / Nm<3> are separately injected to the three areas. The low-carbon low-emission sintering method effectively couples the differences between the heating capacity requirements and the gas quality of different areas of the sintering material layer, realizes heating capacity balanced distribution of the material layers at different heights, forms a beneficial ore-forming condition, greatly improves the sintering quality and the quality index, meanwhile, effectively expands the coverage area of gas injection, further reduces the solid fuel consumption, increases the emission reduction ratio of pollutants such as NOX, SO2 and COX, and realizes the low-carbon low-emission sintering.

Description

technical field [0001] The invention relates to a sintering method, in particular to a method for realizing low-carbon and low-emission sintering based on multi-type gas coupling injection, which belongs to the sintering industry in the field of iron and steel metallurgy. Background technique [0002] The iron and steel industry is not only a strategic pillar industry and economic pillar of some countries, but also plays a vital role in the development of the entire human society. However, the development of the iron and steel industry has also brought about problems such as energy consumption and environmental pollution. As a front-end process in the iron and steel industry, sintering has the characteristics of high energy consumption and high pollution. The sintering process mainly relies on solid fuel for heating, and its solid fuel consumption accounts for as high as 75-80% of the energy consumption of the sintering process, while the conversion of fuel nitrogen in the s...

Claims

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Application Information

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IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 季志云范晓慧赵元杰甘敏陈许玲黄晓贤袁礼顺张一雄黄斌斌唐庆余汪国靖吕薇
Owner CENT SOUTH UNIV
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