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Environment-friendly blast furnace coal injection combustion improver and addition method

A technology of blast furnace coal injection and combustion-supporting agent, which is applied in blast furnace, blast furnace details, blast furnace parts and other directions, can solve the problems of reduced combustion-supporting effect, complicated process, difficult grinding, etc., and achieves lower ignition point, simpler production process, and lower coke ratio. Effect

Active Publication Date: 2012-02-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent No. 200510045351.5 Catalytic combustion-supporting additives for blast furnace coal injection and their adding methods, which include metal oxides, transition metal oxides, rare earth metal oxides, alkaline earth metal oxides, and perovskite structure oxides, using mechanical mixing technology It is formulated, the process is relatively complicated, and the cost is high. At the same time, this addition method is only suitable for inorganic mineral substances that are easy to grind, and is not suitable for organic additives such as waste tires. There are two reasons: First, waste tires are elastomers , it is difficult to grind; second, the proportion of waste tire rubber particles is much lower than that of coal powder. When this method is used, the coal powder and rubber particles will be separated in the coal pipeline, which will significantly reduce the combustion-supporting effect.

Method used

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  • Environment-friendly blast furnace coal injection combustion improver and addition method
  • Environment-friendly blast furnace coal injection combustion improver and addition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: This example is at 1350m 3 It is obtained from industrial experiments on blast furnaces. What adopt is that natural rubber is the waste tire rubber powder of main body as additive (composition is: 66.14%, carbon black 24.76%, CaCO 3 2.12%, MgCO 3 1.89%, active SiO 2 1.97%), mechanically processed to -30 mesh, the added amount is 3.5% of the coal powder, mixed with coal powder before the tuyere, the blast furnace coal injection ratio increased by 9.5kg / t on average, and the coke ratio decreased by 12kg on average / t.

Embodiment 2

[0015] Example 2: This example is at 1350m 3 It is obtained from industrial experiments on blast furnaces. What adopt is that natural rubber is the waste tire rubber powder of main body as additive (composition is: 66.14%, carbon black 24.76%, CaCO 3 2.12%, MgCO 3 1.89%, active SiO 2 1.97%), mechanically processed to -30 mesh, the amount added is 7.5% of the coal powder, and mixed with coal powder before the tuyere, the blast furnace coal injection ratio increased by an average of 16.5kg / t, and the coke ratio decreased by an average of 21.7 kg / t.

Embodiment 3

[0016] Embodiment 3: this embodiment is also carried out industrial test on 1350m blast furnace and obtains. What adopt is that styrene-butadiene rubber is the waste tire rubber powder of main body as additive (composition is: 65.36%, carbon black 27.23%, CaCO 3 2.31%, MgCO 3 2.09%, active SiO 2 1.93%), mechanically processed to -30 mesh, the added amount is 7.5% of the coal powder, mixed with coal powder before the tuyere, the blast furnace coal injection ratio increased by an average of 14.7kg / t, and the coke ratio decreased by an average of 19.5 kg / t.

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Abstract

The invention belongs to the field of iron smelting, and relates to an environment-friendly blast furnace coal injection combustion improver and an addition method; the combustion improver is waste tyre rubber powder comprising hydrocarbons, carbon black, CaO, MgO, and the like, and is prepared by processing the waste tyre to -30 meshes by a mechanical pulverization method. The combustion improver provided by the invention is processed by solid wastes commonly seen in daily life, and reaches the purposes of energy saving, consumption reduction, and environment protection. Meanwhile, the combustion improver can effectively increase the combustion rate of blast furnace injected coal dust at a tuyere, increase the coal injection amount, and reduce the coke ratio. The combustion improver has a simple production process, and a unique addition mode, can be uniformly mixed with coal for blast furnace coal injection, and has obvious combustion improving effect.

Description

Technical field: [0001] The invention belongs to the field of ironmaking, and relates to an environment-friendly blast furnace coal-injection combustion aid and a adding method. Background technique: [0002] Blast furnace coal injection technology is one of the most effective ways to save coke and reduce the cost of pig iron in blast furnace ironmaking. Due to the extremely short residence time of pulverized coal in the combustion zone of the tuyere, with the increase of the amount of coal injection, the increase of unburned coal powder will affect the gas permeability of the material column and the viscosity of the slag. The premise of the amount of coal. [0003] Due to the rapid development of the automobile industry, there has been a large increase in the number of waste tires. Scrap tires are high-molecular hydrocarbon polymer materials, which are difficult to degrade under natural conditions. If it is abandoned on the surface or buried in the ground, it will not ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C21B5/00C21B7/00
Inventor 张建良任山刘伟剑邢相栋白亚楠王广伟刘征建苏步新
Owner UNIV OF SCI & TECH BEIJING