Method for preparing clean steel by coal gas direct reduction one-step method
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A pure steel and coal-to-gas technology, applied in the field of smelting reduction ironmaking, can solve the problems of slow reduction speed, long smelting cycle, low efficiency, etc., and achieve the effect of simple process
Active Publication Date: 2016-08-10
太原依创瑞诚科技有限公司
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Problems solved by technology
The SL-RN process uses coal as the reducing agent, and can obtain a sponge with a metallization rate of about 93%. However, the problem of ring formation has been plagued by the development of this process. In addition, low efficiency, slow reduction speed, and high energy consumption also limit this process. further development of the process
[0010] 2) The tunnel kiln production process is characterized by easy handling of raw materials and fuel, easy control of the production process, stable equipment operation, and uniform product quality. It is mainly used to produce high-purity iron powder, but the tunnel kiln process has high coal consumption, short tank life, and high labor intensity. , long smelting cycle and poor economies of scale, etc., limit that this process will not be the inheritance of the new ironmaking process after all.
Therefore, none of them can be compared with the currently commonly used "blast furnace-converter" process in terms of comprehensiveness.
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Embodiment 1
[0104] Example 1: Annual production of 100,000 tons of pure steel using iron oxide pellets.
[0105] Raw materials: 1) 73,000 tons of long-flame coal, including 6% ash, 33% volatile matter, 60% fixed carbon, 0.28% sulfur, and a particle size of 40-60mm; 2) 160,000 tons of iron oxide pellets, whose composition See the table below.
[0106]
[0107] Heat long-flame coal at a heating rate of 70°C / min to 650°C for pyrolysis, process 9 tons per hour, and accumulatively obtain 5,800 tons of light tar and 29.2 million Nm of 73,000 tons of long-flame coal 3 Pyrolysis gas, 43,000 tons of spongy fixed carbon. Light tar of which is sold as a commercial product.
[0108] 60% of the total pyrolysis gas (17.52 million Nm 3 ) as an energy source, heat 68% (29,240 tons) of spongy fixed carbon obtained by pyrolysis to 850-1100°C at a rate of 3.65 tons per hour, and pass 5.18×10 water vapor with a pressure of 0.1MPa and a temperature of 450K 7 N m 3 , the reaction system obtained reduci...
Embodiment 2
[0117] Example 2: 100,000 tons of pure steel is produced annually by using Indonesian sea sand ilmenite.
[0118] Raw materials: 1) 78,000 tons of non-caking coal, including 6% ash, 35% volatile, 62% fixed carbon, 0.26% sulfur, particle size 40~60mm; 2) pellets made of Indonesian sea sand ilmenite The ore is 18,500 tons, and its composition is as follows.
[0119]
[0120] Heat the non-caking coal at a heating rate of 75℃ / min to 680℃ for pyrolysis, process 9 tons per hour, and accumulatively obtain 6197 tons of light tar and 31.2 million Nm of 78,000 tons of non-caking coal 3 Pyrolysis gas and 45,900 tons of spongy fixed carbon.
[0121] 60% of the total pyrolysis gas (1.87 million Nm 3 ) as an energy source, heat 65% (31,200 tons) of the spongy fixed carbon obtained by pyrolysis to 850-1100°C at a rate of 3.9 tons per hour, and feed 5.53×10 water vapor with a pressure of 0.1MPa and a temperature of 450K 7 N m 3 , the reaction system obtains reducing gas, where (CO+H 2 )...
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Abstract
The invention discloses a method for preparing clean steel by a coal gas direct reduction one-step method. Low-coal-rank coal is pyrolyzed to tar, pyrolyzed coal gas and sponge-shaped fixed carbon at a medium temperature; the sponge-shaped fixed carbon and water vapor are reacted to prepare reducing gas; the reducing gas is introduced in iron pellets or lump ores; iron therein is selectively reduced to obtain pure sponge iron; the pure sponge iron is filled in an electric furnace for smelting to obtain pure liquid-state steel; and meanwhile, the pyrolyzed coal gas is used as heating energy for pyrolysis of the low-coal-rank coal, gasifying reaction of the sponge-shaped fixed carbon and selective gas base direct reduction of the iron pellets or lump ores. The method extracts the tar and the pyrolyzed coal gas in the low-coal-rank coal to a greater extent, and prepares the reducing gas by the sponge-shaped fixed carbon to serve as by-products in the whole process; the energy cost in the whole smelting process is almost zero; and in the selective reducing process, only iron is reduced, and other elements are not reduced, so that the foundation is laid for preparation of clean steel, the oxidation period and the reducing period in the smelting procedure of a traditional electric furnace are synchronously disappeared, and the clean steel is obtained by a simpler flow.
Description
technical field [0001] The invention belongs to the technical field of smelting reduction ironmaking, and relates to a process method for smelting metallic iron through direct reduction of coal-to-gas based on low-rank coal. Background technique [0002] The "blast furnace-converter" process is currently the most important iron and steel metallurgical process in the world. In this process, coke is used as the energy source and reducing agent required for the reduction reaction, and the iron oxide ore is reduced to make iron. While obtaining iron, elements such as Si, P, and Mn in the iron oxide ore are excessively reduced, and C is also in the iron oxide ore. Saturated and dissolved in molten iron. Then the molten iron obtained from the blast furnace is added to the converter for oxygen-blowing steelmaking. Due to the previous excessive reduction, 30-50Nm per ton of steel needs to be consumed 3 About 50Kg of oxygen and about 50Kg of lime, although most of the Si, P, Mn and...
Claims
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