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Coal gasification system and method of blast furnace slags

A technology of slag gasification and blast furnace slag, applied in the direction of granular/powdered fuel gasification, joint combustion mitigation, energy input, etc., can solve the problems of no safety guarantee, deteriorating working environment, air, water and soil pollution, etc.

Active Publication Date: 2009-12-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the water quenching method is basically used in domestic and foreign treatment of blast furnace slag. The disadvantage of this method is that not only the sensible heat of blast furnace slag cannot be used, but also a large amount of waste of water resources is caused, and serious pollution to the atmosphere, water and soil is also caused. working environment
Therefore, it is not feasible to base energy supply on the basis of oil like other countries. Although importing oil can also solve the energy shortage problem, such an energy strategy is not safe in terms of my country's current strength.

Method used

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  • Coal gasification system and method of blast furnace slags

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Blast furnace slag coal gasification system such as figure 1 As shown, it includes a slag gasifier 3, a coal feeding device 4, a spray gun 5, a heat exchanger 6, a gas dust collector 7, a gas storage tank 8, and a waste heat collection furnace 17; the slag gasifier 3 is provided with a slag inlet 2 , the slag outlet 14 and the gas outlet 18, the gas outlet 18 is communicated with the air inlet of the heat exchanger 6, the gas outlet of the heat exchanger 6 is communicated with the air inlet of the gas dust collector 7, and the gas outlet of the gas dust collector 7 is connected with the gas storage The gas tank 8 is connected; the slag outlet 14 is connected to the waste heat collection furnace 17 .

[0052] The interior of the slag gasifier 3 is provided with a partition wall 15, the two sides of the partition wall 15 are connected with the side walls of the slag gasifier 3, the bottom edge is connected with the bottom of the slag gasifier 3, and the partition wall 15 ...

Embodiment 2

[0064] The blast furnace slag coal gasification system is the same as that in Example 1, except that the horizontal distance between the axis of the slag gasifier and the partition wall is 80% of the diameter of the slag gasifier; (2) There are 6 coal feeding devices in the coal injection system and spray guns, where 4 spray guns are inserted into the slag gasifier at the side, 2 spray guns are inserted into the slag gasifier at the bottom, and the gas outlet diameter of the 4 spray guns inserted into the side is 8mm, and the gas outlet is connected to the furnace The distance from the bottom is 100mm, and the spray gun inserted into the side is arranged in a tangential circle, forming an angle of 15° with the horizontal plane; the diameter of the air outlet of the spray gun inserted into the bottom is 20mm, and the distance between the air outlet and the bottom of the furnace is 50mm, and the bottom spray gun is perpendicular to the horizontal plane. (2) The diameter of the sl...

Embodiment 3

[0068] The blast furnace slag coal gasification system is the same as in Example 1.

[0069] The blast furnace slag gasification method is the same as that in Example 1, except that the gasification agent is carbon dioxide, and the flow rate of carbon dioxide is 1.9-2.5 according to the ratio of the number of O atoms in carbon dioxide to C atoms in coal powder.

[0070] 43m CO produced per ton of blast furnace slag by the above method 3 .

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Abstract

A coal gasification system and a method of blast furnace slags relate to the blast furnace slag utilization technology. The system comprises a slag gasifier, a coal injection system, a gas collecting device and a slag collecting device; wherein, the slag gasifier is provided with a slag inlet, a slag outlet, a gas outlet and a partition; the gas outlet is connected with the gas collecting device; a damper is arranged at the slag outlet which is connected with the slag collecting device. The method comprises the following steps: the blast furnace slags are placed into the slag gasifier from the slag inlet through a slag runner; pulverized coal and gasifying agents are injected into the slag gasifier by a spray gun, and the outflow velocity of the slags out of the slag outlet is controlled by regulating the height of the damper. The method of the invention has enormous environmental benefits and is of significance to realize the national goal of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to blast furnace slag utilization technology, in particular to a blast furnace slag coal gasification system and method. Background technique [0002] The iron and steel industry is an important basic industry of my country's national economy. China's iron and steel industry has developed rapidly since the 1990s. In 1996, my country's crude steel output has reached the first place in the world. With the growth of steel output, the solid waste produced by the iron and steel industry The total amount is also increasing, and among the solid waste, blast furnace slag accounts for a large proportion. Blast furnace slag is composed of gangue in iron ore, ash in fuel and non-volatile components in solvent. In the process of iron and steel production, the temperature of blast furnace slag is as high as 1400-1600 ° C. The sensible heat contained in it is It is equivalent to the heat generated by the complete combustion of 55Kg ~ 64Kg stand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C10J3/48C10J3/46
CPCY02E20/18Y02P20/129Y02W30/50
Inventor 于庆波秦勤李朋陆钟武
Owner NORTHEASTERN UNIV
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