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
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[0027] Example 1
[0028] A method for strengthening sintering with multi-type gas coupling injection in the present invention. Under the conditions of mixed carbon content of 5.6%, binary basicity of 1.85, sintering moisture of 6.75%, and material layer height of 700mm, the maximum temperature of the sintered material surface is The area between the locations of 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 same sinter cup test with other conditions, the injected heat value of zone I is 35MJ / Nm 3 High calorific value gas, the injected calorific value of 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.
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[0029] Example 2
[0030] A method for strengthening sintering with multi-type gas coupling injection in the present invention. Under the conditions of mixed carbon content of 5.6%, binary basicity of 1.85, sintering moisture of 6.75%, and material layer height of 800mm, the maximum temperature of the sintered material surface is The area between the locations of 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 sinter cup test under the same other conditions, the injected heat value of zone I is 42MJ / Nm 3 High calorific value gas, the injected calorific value of zone Ⅱ is 25MJ / Nm 3 Medium calorific value gas, zone Ⅲ is injected with calorific value 13MJ / Nm 3 Low calorific value gas, and reduce the carbon content of the mixture to 5.0%.
Example Embodiment
[0031] Example 3
[0032] A method for strengthening sintering with multi-type fuel gas coupling injection in the present invention. Under the conditions of mixed carbon content of 5.6%, binary basicity of 1.85, sintering moisture of 6.75%, and material layer height of 900mm, the maximum temperature of the sintered material surface is The area between the locations of 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 sinter cup test under the same other conditions, the injected heat value of zone I is 50MJ / Nm 3 High calorific value gas, the injected calorific value of zone II is 28MJ / Nm 3 Medium calorific value gas, zone Ⅲ is injected with calorific value 13MJ / Nm 3 Low calorific value gas, and reduce the carbon content of the mixture to 4.85%.
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