Effect of natural gas injection point on combustion and gasification efficiency of pulverized coal under blast furnace condition
| Autor: | Yohsuke Matsushita, Hidetoshi Matsuno, Akinori Murao, Michitaka Sato, Yasuhiro Saito, Hideyuki Aoki, Shota Akaotsu, Kiyoshi Fukada |
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| Rok vydání: | 2019 |
| Předmět: |
Blast furnace
blast furnace gasification 02 engineering and technology Combustion 01 natural sciences 020501 mining & metallurgy law.invention law Natural gas 0103 physical sciences ignition Materials Chemistry Physical and Theoretical Chemistry lance 010302 applied physics Pulverized coal-fired boiler business.industry Mechanical Engineering Metallurgy Metals and Alloys Injection point Condensed Matter Physics Ignition system pulverized coal 0205 materials engineering Mechanics of Materials CO2 emission Environmental science hydrogenous reducing agent business combustion |
| Zdroj: | ISIJ International. 59:2165-2173 |
| ISSN: | 1347-5460 0915-1559 |
| DOI: | 10.2355/isijinternational.isijint-2019-154 |
| Popis: | The reduction of CO2 emission from the ironmaking process is an important issue from the view of environmental problems typified by global warming in recent years. Low RAR (reducing agent rate) operation of the blast furnace is one of effective methods for reducing CO2 emission. Injection of HRA (hydrogenous reducing agents) from the tuyere (where is the lower part of a blast furnace) is also effective measure. In this study, the influence of HRA injection point on combustion and gasification efficiency of pulverized coal (PC) in the case of simultaneous injection of HRA and PC from double-channel lance was examined by small scale combustion furnace and three-dimensional numerical simulation for permeability in the blast furnace. Combustion experimental conditions were in three cases, case 1: injected HRA from the outer side and PC from the inner side of double-channel lance, case 2: injected HRA from inner side and PC from outer side of double-channel lance and case 3: injected HRA and PC premixed. As a result, the combustion and gasification efficiency was increased in the order of case 1, case 2 and case 3. The rate of combustion and gasification of PC was investigated in case1. Not only the oxidation reaction was also accelerated CO2 and H2O gasification reaction in the case of simultaneous injection HRA and PC. A three-dimensional numerical simulation of the experimental furnace was conducted, we confirmed the increase of combustion temperature, the acceleration of oxygen consumption and gasification reaction as with the experimental results in the case of simultaneous injection HRA and PC. |
| Databáze: | OpenAIRE |
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