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Energy-saving and emission-reducing hydrogen gas classified injection method for sintering

A gas classification, energy saving and emission reduction technology, applied in the field of iron and steel metallurgy, can solve the problems of deterioration of sinter reducibility, low sinter strength, short residence time, etc., and achieve the goal of improving heat utilization efficiency, drum strength and quality Effect

Active Publication Date: 2019-12-13
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual sintering process, the closer to the upper material layer, the less heat storage, so the residence time at high temperature (>1200°C) is short, the sintering is insufficient, and the amount of liquid phase is insufficient, resulting in low sinter strength and more ore returning. The closer to the lower material layer, the greater the heat storage, and the sintering temperature is too high (>1350°C) to cause over-melting, resulting in deterioration of the reductibility of sinter

Method used

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  • Energy-saving and emission-reducing hydrogen gas classified injection method for sintering

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Effect test

Embodiment 1

[0025] A sintering energy-saving and emission-reducing hydrogen-based gas staged injection technology, under the conditions of 5.6% carbon content of the mixture, 1.85 binary basicity, 6.75% sintering moisture, sintering negative pressure -10kPa, and 700mm layer height, the sintering material The area between the surface and the position where the highest temperature is 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. Reduce the carbon content of the mixture to 5.3%, and under the sintering cup test with the same other conditions, according to the heat replacement ratio of the added gas fuel and the reduced solid fuel of 1:4.5, the sequential injection heat value in areas Ⅰ, Ⅱ, and Ⅲ is 39.8 MJ / Nm 3 The injection height is 450mm. The natural gas supplement in zone I accounts for 50% of the total heat supplement, the natural gas supplement in zone II accounts for 30% of the total heat supplement, and the n...

Embodiment 2

[0027]Reduce the carbon content of the mixture to 5.15%, and under the same sintering test under the other conditions, according to the heat replacement ratio of 1:4 between the added gas fuel and the reduced solid fuel, the heat value of sequential injection in areas Ⅰ, Ⅱ, and Ⅲ is 39.8MJ / Nm 3 Natural gas is used for compensation, and the injection height is 500mm. The natural gas supplement in area I accounts for 55% of the total heat supplement, the natural gas supplement in area II accounts for 30% of the total heat supplement, and the natural gas supplement in area III accounts for 55% of the total heat supplement. 15% of total caloric intake. Sintering index, NO X , SO 2 and CO X The emission reductions are shown in Table 1.

Embodiment 3

[0029] Reduce the carbon content of the mixture to 5.0%, and under the same sintering test with other conditions, according to the heat replacement ratio of added gas fuel and reduced solid fuel of 1:3.5, the heat value of sequential injection in areas I, II, and III is 39.8MJ / Nm 3 The injection height is 550mm. The natural gas supplement in area I accounts for 60% of the total heat supplement, the natural gas supplement in area II accounts for 30% of the total heat supplement, and the natural gas supplement in area III accounts for 60% of the total heat supplement. 10% of total caloric intake. Sintering index, NO X , SO 2 and CO X The emission reductions are shown in Table 1.

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Abstract

The invention discloses an energy-saving and emission-reducing hydrogen gas classified injection method for sintering. According to the inherent heat distribution difference of a sintering material layer, the material layer is divided into a high heat supplementing area (1250 DEG C), a medium heat supplementing area (1250-1300 DEG C) and a low heat supplementing area (1300 DEG C). According to thedifference of heat requirements in different areas of the sintering material layer, gas fuel is supplemented, uniform-heating homogeneous sintering can be easily realized, the sinter yield and quality index are greatly increased, the consumption of clean gas fuel for replacing solid fuel is reduced, the fuel utilization rate is increased, the emission amount of COx, SOx and NOx is reduced, the application and popularization prospects are broad, and the green development of the iron and steel industry is facilitated.

Description

technical field [0001] The invention relates to a gas injection technology, in particular to a sintering energy-saving and emission-reducing hydrogen-based gas staged injection technology, which belongs to the sintering field in the iron and steel metallurgy field. Background technique [0002] The iron and steel industry is a typical energy-intensive sector, and its energy consumption is as high as 10% to 15% of the world's energy consumption. Sintering is the front-end process of the iron and steel industry, and the energy consumption of the process ranks second in the iron and steel industry. The combustion of solid fuel during the sintering process is also an air pollutant NO in the iron and steel industry. X , CO X The main source of emissions, SO X important source of emissions. In addition, sinter accounts for more than 70% of the blast furnace ironmaking charge, and the quality of sinter is closely related to the stability, high efficiency, low consumption and lar...

Claims

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Application Information

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IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 范晓慧赵元杰季志云甘敏周浩宇李谦陈许玲黄晓贤张一雄黄斌斌袁礼顺唐庆余汪国靖吕薇
Owner CENT SOUTH UNIV
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