A multi-gas-based shaft furnace reduction system and its reduction method
A gas-based shaft furnace and shaft furnace technology, applied in the field of iron and steel metallurgy, can solve the problems of low sensible heat utilization rate of pyrolysis raw coal gas, complex system structure and process, and large investment, so as to achieve simple and scientific overall structure and low investment cost , the effect of improving the utilization rate
Active Publication Date: 2019-08-23
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0003] The existing pyrolysis furnace combined with gas-based shaft furnace system is mostly composed of a series of pyrolysis furnaces, separation and purification systems, reforming systems and gas-based shaft furnaces. The sensible heat utilization rate of pyrolysis raw coal gas is low, and the system structure and Complex process and large investment
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[0042] Figure 1-3 A first example of a polygas-based reduction system of the present invention is shown, see figure 1 , the system includes a first shaft furnace and a second gas-based shaft furnace 30 .
[0043] Wherein, the first shaft furnace is composed of a central air-based shaft furnace 10 located at the center and used for reducing and oxidizing pellets, and a pyrolysis furnace 20 integrally formed on the outside of the central air-based shaft furnace 10. The central air-based shaft furnace The top of the furnace 10 is provided with an oxidation pellet inlet 11, the upper side is provided with a furnace top gas outlet 12, and the lower part is provided with a sponge iron outlet 13; the pyrolysis furnace 20 is provided with a heating radiant tube 23, and the top is provided with a coal inlet 21, the bottom is provided with an extraction charcoal outlet 22; the lower part of the furnace wall between the pyrolysis furnace 20 and the central gas-based shaft furnace 10 is...
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The invention specifically relates to a reduction system of a multi-gas-based shaft furnace and a reduction method thereof. The reduction system comprises a first shaft furnace and a second gas-basedshaft furnace. The first shaft furnace is composed of a central gas-based shaft furnace arranged in the center and a pyrolyzing furnace integrally formed with the outer side of the central shaft furnace, an oxidized pellet inlet is formed in the top of the central gas-based shaft furnace, a top gas outlet is formed in the side edge of the upper portion of the central gas-based shaft furnace, and asponge iron outlet is formed in the lower portion of the central gas-based shaft furnace. The pyrolyzing furnace is internally provided with a heating radiation pipe, a coal inlet is a formed in thetop of the pyrolyzing furnace, and an extraction coal outlet is formed in the bottom of the pyrolyzing furnace. A plurality of nozzle assemblies are circumferentially distributed on the lower portionof the furnace wall between the pyrolysis furnace and the central gas-based shaft furnace. The pyrolysis furnace and the outer side of the central shaft furnace are integrally formed, specifically, atleast a part of side walls of the pyrolysis furnace and the central shaft furnace are a first common cavity wall of the pyrolysis furnace and the central shaft furnace, the first common cavity wall is made of silicon brick materials, and the cavity wall accounts for at least 1 / 2 of the area of the side wall of the central shaft furnace. A reduction gas inlet of the second gas-based shaft furnaceis connected with the top gas outlet. The reduction system realizes efficient utilization of raw materials of reducing gas and reduces equipment investment.
Description
technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a multi-gas-based shaft furnace reduction system and a reduction method thereof. Background technique [0002] There are two types of direct reduction methods: gas-based and coal-based. The gas-based direct reduction method has become the mainstream technology of non-coking coal metallurgical processes because of its advantages of high volume utilization, high thermal efficiency, and high productivity. At present, most of the direct reduced iron in the world is produced by the gas-based method, which mainly uses natural gas as the raw material for gas production, water vapor or carbon dioxide as the conversion agent, and prepares high-quality reduced iron in a reforming converter equipped with a nickel-based catalyst. Gas; and based on the characteristics of domestic energy rich in coal and lack of oil, reducing gas is mostly produced from coal. [...
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IPC IPC(8): C21B13/02
Inventor 佘雪峰安振龙易万里
Owner UNIV OF SCI & TECH BEIJING