Furnaces – Including fluid fuel burner – Powdered solid fuel
Patent
1987-07-09
1990-05-29
Price, Carl D.
Furnaces
Including fluid fuel burner
Powdered solid fuel
110263, 110347, 431160, 431 11, 431237, 431242, 431243, 431247, F23C 110, F23D 100
Patent
active
049286056
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an oxygen heater for producing hot oxygen which is required in the refining of ferrous and nonferrous metals, such as the direct reducing smelting of aluminum.
This invention also relates to a lance for supplying hot oxygen to a zone for the refining of ferrous and nonferrous metals such as, in particular, the reduction reduction zone of a direct reducing furnace.
This invention further relates to a pulverized solid fuel burner used in an electric furnace for melting steel scrap, aluminum, copper and the like.
BACKGROUND ART
Recently, there have been developed, methods of refining aluminum in a blast furnace. In the conventional methods, such as disclosed in U.S. Pat. No. 3,661,561, oxygen preheated to approximately 1,000.degree. C. is blown into a blast furnace through a plurality of tuyeres of the furnace. In these processes, in order for the refining of aluminum in the blast furnace to be successful, it has been important subject how efficiently the preheated oxygen was generated and supplied to the furnace. One of the prior heater devices used in an experiment produced the hot oxygen by effecting the heat exchange between oxygen of room temperature and a fluid generated by another heat source. However, in the experiment using this particular heater device, the amount of the produced hot oxygen was several tens of thousand Nm.sup.3 /h. Consequently, it is not economical to apply the above-mentioned way of preheating oxygen to the preheating process when there is no utilizable heat source and when a specific heat source must be newly prepared.
Also, the use of hot oxygen in the refining process of steel or zinc, has been suggested. It is desired in this case to provide a device that can produce and supply a great amount of hot oxygen safely and efficiently.
In the refining of iron or aluminum, air or oxygen-enriched air is supplied to a furnace through the tuyere or the lance of the furnace after it is heated up to a high temperature. An example of the heater which is applicable to this refining is shown in Japanese Published Unexamined Patent Application No. 59-501278. This heater, i.e., a burner which also serves as a lance is used for heating metal products in a fusion furnace. Oxygen is discharged in a jet from the nozzle of the burner and fuel is supplied from the conduit concentrically surrounding the nozzle. The supplied fuel is then jetted into the discharged oxygen and is burned with the oxygen, which produces hot oxygen including combustion gas. Depending on the purpose, the oxygen content of the combustion gas is controlled and the heater is used either as a burner or as a lance for hot oxygen containing combustion gas.
However, there arises a problem of the temperature of the peripheral portion of the burner rising severely since the construction of the burner is such that fuel supplied from the nozzle-surrounding conduit is jetted into and mixed with the oxygen flow and is burned within the burner so that the hot combustion gas including oxygen is produced.
These days, there are used, burners which utilize pulverized coal as their main fuel for the purpose of melting steel scrap, aluminum, copper and the like. These burners must produce flames having stable temperatures of not less than approximately 2,000.degree. C. so that the burners have the required melting capacity. However, the combustion rate of pulverized coal is extremely slow in comparison with that of a liquid fuel such as fuel oil or a gaseous fuel such as CH.sub.4, C.sub.3 H.sub.8 and the like. Also, the flame temperature of pulverized coal is lower than that of the liquid or gaseous fuel. It is not easy to produce a stable flame by the monofuel combustion of pulverized coal. The flame due to the monofuel combustion is unstable and sometimes extinguished when the temperature of the atmosphere in the vicinity of the burner in a furnace is low, causing its radiant heat to be reduced. For these reasons, there have been used, burners which utilize a gaseous or liquid fuel such as LPG, n
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Hirano Takashi
Kobayashi Nobuaki
Suwa Toshio
Nippon Sanso Kabushiki Kaisha
Price Carl D.
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