A method and device for heating pulverized coal by using blast furnace molten iron dedusting circulating hot flue gas
A blast furnace molten iron and hot flue gas technology, applied in the field of heating pulverized coal, can solve the problems of low thermal energy utilization efficiency, thermal energy waste, etc., and achieve the effects of reducing the overall cost, improving the surrounding environment, and increasing the temperature
Active Publication Date: 2022-06-28
付光明 +1
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Problems solved by technology
However, the prior art coal injection pulverized coal heating technology uses blast furnace hot blast stove exhaust gas or combustion furnace hot flue gas to heat pulverized coal, for example: a kind of blast furnace coal injection system pulverized coal preheating in Chinese invention patent CN201410070774.1 Thermal technology method etc., the existing problem of above-mentioned prior art is: the thermal energy utilization efficiency is low, the hot flue gas (below about 120 ℃) of combustion furnace after pulverized coal is heated, is exhausted in the atmosphere, and this part thermal energy is wasted in vain Lose
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[0037] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
[0038]A method for heating pulverized coal by utilizing hot flue gas of blast furnace molten iron dedusting and circulating The heat source is used to heat the blast furnace blown pulverized coal. The invention makes full use of the heat exchanged between molten iron and dedusting flue gas in the blast furnace smelting and tapping process, heats the blown pulverized coal, and uses it cyclically to make the most of the molten iron heat in the blast furnace smelting and tapping process.
[0039] The hot flue gas after the heat exchange between the molten iron and the dedusting flue gas heats the pulverized coal, and the heated pulverized coal is injected into the blast furnace. Heat exchange, and the hot flue gas heats the pulverized coal.
[0040] A device for heating pulverized coal by using hot flue gas from blast furnace molten iron dust removal and circ...
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The invention relates to a method and a device for heating pulverized coal by utilizing hot metal dedusting circulating hot flue gas of a blast furnace, and belongs to the technical field of metallurgical ironmaking and coal injection technology and equipment. The technical plan is: use the hot flue gas from the molten iron tank and iron ditch dedusting circulation in the process of blast furnace smelting and tapping as the main heat source, and the hot flue gas produced by the gas burner or burner as the auxiliary heat source to heat the pulverized coal injected into the blast furnace and circulate Reciprocating use maximizes the use of the heat of molten iron during blast furnace smelting and tapping. The positive effects of the present invention: the heat of molten iron is recovered to the greatest extent, the temperature of pulverized coal entering the blast furnace is increased, the burnout rate of pulverized coal is improved, the fuel ratio of the blast furnace is reduced, the replacement ratio of pulverized coal is improved, energy saving and consumption reduction, and reduction of carbon emission. The surrounding environment of the blast furnace casthouse is improved, considerable economic benefits are created by increasing the furnace pulverized coal temperature, and the overall cost of the pulverized coal heating device is reduced.
Description
technical field [0001] The invention relates to a method and a device for heating pulverized coal by utilizing blast furnace molten iron dedusting and circulating hot flue gas, and belongs to the technical field of metallurgical ironmaking and coal injection technology and equipment. Background technique [0002] At present, in the field of metallurgical ironmaking, the pulverized coal heating technology for blast furnace injection can effectively improve the combustion efficiency of pulverized coal, reduce the fuel ratio of the blast furnace, and increase the pulverized coal replacement ratio. Created considerable economic benefits. However, the prior art pulverized coal heating technology uses blast furnace hot blast stove waste flue gas or combustion furnace hot flue gas to heat pulverized coal. Thermal process methods, etc., the above-mentioned existing technologies have problems: the utilization efficiency of thermal energy is low, and the hot flue gas (about 120°C bel...
Claims
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IPC IPC(8): C21B5/00C21B7/00
CPCC21B5/003C21B7/002C21B2100/66C21B2100/44Y02P10/20
Inventor 付光明代艺波
Owner 付光明