A system and method for pulverized coal gasification and iron ore reduction

A technology for iron ore and pulverized coal is applied in the system field of pulverized coal gasification and iron ore reduction. , The effect of heat transfer and mass transfer in the furnace is good, and the effect of improving the processing efficiency

Active Publication Date: 2020-01-14
TANGSHAN YANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the raw materials used in the iron reduction process of the three ironmaking processes is relatively large, and the final reduction furnace is mostly a shaft furnace or a vertical furnace. The large particle size and the type of reduction furnace determine the solid- Solid, solid-gas, liquid-solid, liquid-gas and other multi-phase heat transfer and mass transfer effects will not be very good. When the heat transfer and mass transfer effects are not good, more coal and oxygen will be consumed to produce more gas. Satisfy the requirement of iron reduction

Method used

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  • A system and method for pulverized coal gasification and iron ore reduction
  • A system and method for pulverized coal gasification and iron ore reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A system for pulverized coal gasification and iron ore reduction, including a pyrolysis gasification device, a reduction device 17, and a first cyclone separator 4. The pyrolysis gasification device is a U-shaped reaction device connected at the bottom, and one side is a pyrolysis device. Section 3, the upper part on the other side is the gasification section 7, the lower part is the gasification reduction section 9, the reduction device 17 is connected with the pyrolysis gasification device, the raw coal gas produced by the pulverized coal entering the pyrolysis section 3 enters the reduction device 17, and reduces The sponge iron powder produced by device 17 reducing iron ore powder enters the gasification reduction section 9 of the pyrolysis gasification device, the air inlet of the first cyclone separator 4 is connected to the pyrolysis section 3, and the powder coke outlet at the bottom is connected to the gasification section 7. The top is connected, and the coke c...

Embodiment 2

[0066] A system for pulverized coal gasification and iron ore reduction, including a pyrolysis gasification device, a reduction device 17, and a first cyclone separator 4. The pyrolysis gasification device is a U-shaped reaction device connected at the bottom, and one side is a pyrolysis device. Section 3, the upper part of the other side is the gasification section 7, the lower part is the gasification reduction section 9, the reduction device 17 is connected with the pyrolysis gasification device, the raw coal gas produced by the pyrolysis section 3 enters the reduction device 17, and the reduction device 17 produces The sponge iron powder enters the gasification reduction section 9 of the pyrolysis gasification device, the air inlet of the first cyclone separator 4 is connected to the pyrolysis section 3, the powder coke outlet at the bottom is connected to the top of the gasification section 7, and the pyrolysis section 3 The powder coke carried in the raw coal gas is separ...

Embodiment 3

[0077] Coal gasification of the system described in Example 1 and a method for synergistic reduction of iron ore

[0078] 1) After the pulverized coal is ground (coal powder particle size distribution is 20-500 μm), it enters the pyrolysis section 3 of the pyrolysis gasification device, and the high-temperature gas generated on the other side of the pyrolysis gasification device enters the pyrolysis section 3, and the thermal The gas flow velocity in the pyrolysis section is 5m / s, the residence time is 5s, the gas temperature at the bottom pyrolysis section 3 inlet of the pyrolysis section 3 is 1200°C, and the raw gas temperature at the top outlet of the pyrolysis section 3 is 1050°C; Pyrolysis, the raw coal gas produced carries powder coke into the first cyclone separator 4, and the raw coal gas after the powder coke is separated by the first cyclone separator 4 enters the reduction device 17;

[0079] 2) The iron ore powder enters the reduction device 17, where the reduction...

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Abstract

The invention relates to a system and a method capable of realizing cooperation of pulverized coal gasification with iron ore reduction. The system comprises a pyrolysis and gasification device, a reduction device and a first cyclone separator; the pyrolysis and gasification device is a U-shaped reaction device with the bottoms communicating with each other, a pyrolysis section is arranged on oneside, a gasification section is arranged at the upper part of the other side, and a gasification reduction section is arranged at the lower part; the reduction device is connected with the pyrolysis and gasification device; raw coke oven gas produced after pulverized coal enters the pyrolysis section enters the reduction device, and sponge iron produced after iron ore powder is reduced by the reduction device enters the gasification reduction section of the pyrolysis and gasification device; an air inlet of the first cyclone separator is connected with the pyrolysis section; a bottom powder coke outlet is connected with the top of the gasification section; powder coke carried by the raw coke oven gas produced in the pyrolysis section is separated by the first cyclone separator and then enters the gasification section; and the reduction device is connected with the first cyclone separator. The iron-making technology is simplified, and the treatment efficiency of the whole technology isimproved.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a system and method for pulverized coal gasification and iron ore reduction. Background technique [0002] At present, blast furnace ironmaking is the mainstream iron ore reduction ironmaking process, including three main processes of coal coking, iron ore sintering (or pelletizing) and blast furnace reduction. The ironmaking process is complicated, with numerous equipments, high investment and high production cost. At the same time, multi-process pollution sources also bring great difficulty to emission control. Coking of coal and sintering of iron ore are set up to meet the requirements of the existing blast furnace reduction on material strength and gas permeability, but from iron oxide (Fe 2 o 3 and Fe 3 o 4 ) reduction reaction mechanism, coking and sintering or pelletizing are not necessary links, only iron ore and reducing agent are needed to complete th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
CPCC21B13/0006C21B13/0073
Inventor 马春元王涛周滨选王鹏赵媛夏霄李军付加鹏
Owner TANGSHAN YANSHAN IRON & STEEL CO LTD
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