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Blast furnace pulverized coal combustion improver as well as preparation method and application thereof

A combustion aid and pulverized coal technology, applied in the field of energy saving in iron and steel smelting, can solve the problems of low lifting efficiency, threats to safe and stable operation, and high cost, and achieve the goals of reducing the content of unburned coal powder, improving comprehensive combustion efficiency, and reducing viscosity Effect

Pending Publication Date: 2021-12-28
云南科兴环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent document CN103266190A reports a multifunctional additive that uses 5-30% rare earth oxide CeO 2 , and the cost is high; the patent document CN108504414A reports a combustion-supporting agent for improving the combustion rate of pulverized coal injection in blast furnaces. The coal-injection combustion-supporting agent is prepared from dust removal ash, steel slag and dolomite, and the Fe, Ca, Effective recovery and utilization of mineral resources such as Mg and Al, but the combustion accelerant contains 35 to 45% of CaO, and the use of alkali metal elements poses a potential threat to the safe and stable operation of the blast furnace; patent document CN112048349A provides a kind of steel slag Powdered coal as the main raw material is used as a combustion aid for pulverized coal. After using the combustion aid, the combustion rate of pulverized coal in the tuyere swivel area can be increased by 2.1%, and the improvement efficiency is not very high.

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  • Blast furnace pulverized coal combustion improver as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of blast furnace pulverized coal combustion accelerant, by weight percentage, is made from the following raw materials: modified siderite 35%, iron red 35%, manganese dioxide 8%, dedusting 10%, ammonium metavanadate 10%, Aluminum powder 2%.

[0030] Wherein, the preparation method of the modified siderite is as follows: the siderite is obtained by roasting at 850° C. for 6 hours.

[0031] Wherein, the aluminum powder is industrial aluminum powder; the mass fraction of active aluminum in the aluminum powder is not less than 95%; the proportion of the aluminum powder with a particle size less than or equal to 0.04mm is not less than 96%.

[0032] Wherein, the dedusting ash is sintering machine head ash.

[0033] In this example, the preparation method of the blast furnace pulverized coal combustion improver is as follows: the modified siderite, iron red, manganese dioxide, dedusting ash and ammonium metavanadate are weighed in proportion, mixed evenly, and ground ...

Embodiment 2

[0035] A kind of blast furnace pulverized coal combustion accelerant, by weight percent, is made from the following raw materials: modified siderite 34%, iron red 34%, manganese dioxide 9%, dedusting 11%, ammonium metavanadate 10.5%, Aluminum powder 1.5%.

[0036] Wherein, the preparation method of the modified siderite is as follows: the siderite is obtained by roasting at 850° C. for 7 hours.

[0037] Wherein, the aluminum powder is industrial aluminum powder; the mass fraction of active aluminum in the aluminum powder is not less than 95%; the proportion of the aluminum powder with a particle size less than or equal to 0.04mm is not less than 96%.

[0038] Wherein, the dedusting ash is sintering machine head ash.

[0039] In this example, the preparation method of the blast furnace pulverized coal combustion improver is as follows: the modified siderite, iron red, manganese dioxide, dedusting ash and ammonium metavanadate are weighed in proportion, mixed evenly, and ground...

Embodiment 3

[0041] A kind of blast furnace pulverized coal combustion accelerant, by weight percentage, is made from the following raw materials: modified siderite 32%, iron red 35%, manganese dioxide 9%, dedusting 11%, ammonium metavanadate 11%, Aluminum powder 2%.

[0042] Wherein, the preparation method of the modified siderite is as follows: the siderite is obtained by roasting at 850° C. for 6 hours.

[0043] Wherein, the aluminum powder is industrial aluminum powder; the mass fraction of active aluminum in the aluminum powder is not less than 95%; the proportion of the aluminum powder with a particle size less than or equal to 0.04mm is not less than 96%.

[0044] Wherein, the dedusting ash is sintering machine head ash.

[0045]In this example, the preparation method of the blast furnace pulverized coal combustion improver is as follows: the modified siderite, iron red, manganese dioxide, dedusting ash and ammonium metavanadate are weighed in proportion, mixed evenly, and ground u...

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Abstract

The invention discloses a blast furnace pulverized coal combustion improver as well as a preparation method and application thereof. The combustion improver is prepared from the following raw materials in percentage by weight: 30-40% of modified siderite, 30-40% of iron oxide red, 5-15% of manganese dioxide, 5-15% of dust remover, 5-15% of ammonium metavanadate and 1-4% of aluminum powder. The selected raw materials are common and wide in source, combustion of the pulverized coal can be promoted from different stages through reasonable matching, the comprehensive combustion efficiency of the pulverized coal is improved, the ignition point of the pulverized coal can be reduced by 50-60 DEG C, the combustion-supporting efficiency value reaches up to about 17%, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of energy saving in iron and steel smelting, and in particular relates to a blast furnace pulverized coal combustion improver and its preparation method and application. Background technique [0002] Blast furnace pulverized coal injection is the central link in the structural optimization of the metallurgical ironmaking system, and it is a favorable means for the development of ironmaking technology at home and abroad, energy saving, consumption reduction, cost reduction, emission reduction and environmental pollution reduction. In the process of blast furnace pulverized coal injection, realize high air temperature, perform dehumidification and oxygen-enriched blast, improve the gas permeability of the furnace charge and the level of oxygen-enriched operation of the blast furnace, improve the defects of pulverized coal injection, optimize the type of coal injection, and evenly inject coal Pulverized coal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C10L9/12
CPCC10L9/10C10L9/12
Inventor 戴祥戴瑞根
Owner 云南科兴环保科技有限公司
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