Low-concentration nitrogen pulverized coal conveying method for smelting reduction furnace

A pulverized coal transportation and low-concentration technology, which is applied in the field of pulverized coal transportation with low-concentration nitrogen, can solve the problems of complicated pulverized coal transportation pipeline structure, increased harmful gas emissions, and uneven injection flow, and achieve flexible adjustment of coal volume Reliable, energy-saving, and improved delivery efficiency

Inactive Publication Date: 2019-07-26
NORTHEASTERN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] In the current high-concentration pulverized coal transportation process, since the structure of the pulverized coal transportation pipeline is still relatively tortuous and complicated, when the conditions such as the pulverized coal mass flow rate or pulve

Method used

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  • Low-concentration nitrogen pulverized coal conveying method for smelting reduction furnace

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Embodiment 1

[0012] The particle size of a certain raw coal is 150μm-300μm, and the moisture content is 3.74%. Firstly, the raw coal is coarsely ground so that its particle size ranges from 53 μm to 178 μm. The pulverized coal after coarse grinding is dried at 120°C for 3 hours, and finally the pulverized coal after drying is finely ground before injection to keep the particle size at about 74μm. The purity of high-pressure nitrogen gas used is 99.9%. Under the distribution of nitrogen, the pulverized coal is injected into the coal injection pipeline through a tank-combined single pipeline. The designed diameter of the coal injection pipeline is 350mm, equipped with four pneumatic ball valves and two 90° elbows. The superficial velocity range of conveying pulverized coal is 14.7m / s, the injection capacity of the system can reach 26t / h, and the injection concentration can reach 26-35kg / kg.

Embodiment 2

[0014] The particle size of pulverized coal particles is 125μm-230μm, and the moisture content is 2.09%. Firstly, the raw coal is coarsely ground so that its particle size ranges from 53 μm to 178 μm. Put the pulverized coal after rough grinding treatment at 120°C for 3 hours drying treatment, and finally carry out the fine grinding treatment before blowing the pulverized coal after drying to keep the particle size at about 58 μm. The purity of the high-pressure nitrogen gas used is 99.9%. Under the distribution of nitrogen, the pulverized coal is injected into the coal injection pipeline through a tank-combined single pipeline. The designed diameter of the coal injection pipeline is 280mm, equipped with four pneumatic ball valves and two 90° elbows. The superficial velocity range of conveying pulverized coal is 10.3m / s, the injection capacity of the system can reach 23t / h, and the injection concentration can reach 23-32kg / kg.

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Abstract

The invention belongs to the field of ironmaking processes, and particularly relates to a low-concentration nitrogen pulverized coal conveying method for a smelting reduction furnace. According to thetechnical scheme, the low-concentration nitrogen pulverized coal conveying method for the smelting reduction furnace includes the following steps that firstly, pulverized coal enters a coal mill through a coal feeder to be coarsely ground, and the grain diameter of the pulverized coal ranges from 53 micrometers to 178 micrometers; the coarsely-ground pulverized coal is fed into a dryer generatorfrom the coal mill, and the pulverized coal is dried at the temperature of 110-130 DEG C for 2-4 hours; the dried pulverized coal is finely ground before being jet and fed into a coarse powder separator to be treated, and then passes through a pulverized coal vibrating screen, and the grain diameter of the pulverized coal ranges from 53 micrometers to 74 micrometers; and the finely-ground pulverized coal is jet to a coal spraying pipeline through a double-tank single pipeline under distribution of nitrogen, pulverized coal high-concentration and nitrogen low-concentration jetting is kept, andthe mass velocity of the pulverized coal ranges from 0.138 kg/s to 0.55 kg/s. By means of the method, the purpose of efficiently conveying the high-concentration pulverized coal in the low-concentration nitrogen environment can be achieved.

Description

technical field [0001] The invention belongs to the field of ironmaking technology, and in particular relates to a method for conveying pulverized coal with low-concentration nitrogen gas for a smelting reduction furnace. Background technique [0002] The iron bath smelting reduction method for smelting molten iron needs to inject a large amount of coal powder into the molten pool. The coal powder conveying process directly affects the stability of production, and is also one of the key technologies in the smelting reduction smelting molten iron system. However, it is difficult for traditional coal injection equipment to achieve the amount of pulverized coal required for the smelting reduction smelting process. Transport efficiency is low. An effective way to solve the above problems is to use high-concentration pulverized coal conveying technology, which can greatly reduce the cold air in the iron bath molten pool under the same condition of conveying powder, which will he...

Claims

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Application Information

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IPC IPC(8): C21B11/00
CPCC21B11/00
Inventor 丁学勇代婧鑫刘程宏居天华王博
Owner NORTHEASTERN UNIV
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