JP2003172584A5 - - Google Patents

Description

[0037]
In addition to LNG, LPG (Liquefied Petroleum Gas), CO, H ₂ and CO / H ₂ mixed gas can be used as fuel fluid. Moreover, liquid fuels, such as heavy oil and kerosene, can also be used.

[0045]
In the dissolution step, it is preferable to satisfy 1 ≦ oxygen ratio <3. Thus, melting and melting of the solid raw material can be promoted, and combustible components such as carbon monoxide generated in the furnace can be burned.
The oxygen ratio refers to the ratio of the amount of oxygen supplied to the amount of oxygen required for the complete combustion of the fuel fluid.
In the refining process after the meltdown, the decarburizing reaction and the slag forming can be performed by setting the fuel fluid supply amount significantly lower, preferably the oxygen ratio to be 3 or more, and blowing the flame retardant fluid (oxygen) at high speed. While promoting, solid raw materials can be dissolved.

[0050]
As secondary materials, solid carbon sources such as coke and coal: hydrocarbon sources such as plastics: lime sources including CaO, CaCO ₃ etc. magnesium sources including MgO, MgCO ₃ etc: Al, Al ₂ O ₃ etc. Aluminum source: iron ore: manganese ore: one or more of alloys can be mentioned.
A solid carbon source, a hydrocarbon source, an aluminum source act as a fuel source.
The above-mentioned auxiliary raw material is usually added by dropping naturally from above. The auxiliary material is preferably a powder having a small particle size in order to enhance solubility and reactivity, but when oxygen is supplied, the powder is likely to be scattered by the exhaust gas.
For this reason, although a particle size of several tens of mm or more is used, solubility and reactivity are impaired.

[0054]
The refining method of the present invention can be applied to at least one of desiliconization, dephosphorization, desulfurization, decarburization, temperature increase, heat addition, scrap melting, alloy melting, reduction treatment, and degassing.
Heat addition is performed for heat compensation when adding an iron source or an alloy source. The reduction treatment is performed using iron ore, manganese ore or the like.
The refining agent used in refining may be selected and used according to the purpose of the refining. For example, in desiliconization and dephosphorization, since it is necessary to stabilize silicic acid and phosphoric acid generated by reaction with oxygen as slag, it is preferable to use a lime source having a stabilizing effect as a refining agent.
It is preferable to use a lime source having at least one of CaO and CaCO ₃ as the main component because it can be rapidly melted and slagged.

[0083]
[Table 4]

[0086]
( Comparative Examples 7 to 10 )
In Comparative Examples 7 and 8 , lime or coke was charged from a shooter at the top of the furnace without using a powder injection device, and only pure oxygen was supplied using a lance.
In Comparative Examples 9 and 10 , the apparatus used in Comparative Example 4 was used.
The amount of scrap that could be dissolved in 30 minutes was measured. The test results are shown in Table 5.

[0087]
[Table 5]

[0090]
( Comparative Examples 11 to 14 )
In Comparative Examples 11 and 12 , the plastic was charged from the shooter at the top of the furnace without using the powder injection device, and only pure oxygen was supplied using the lance.
In Comparative Examples 13 and 14 , the apparatus used in Comparative Example 4 was used.
The test results when treated for 8 minutes are shown in Table 6.

[0091]
[Table 6]

Claims (1)

In the powder blow device according to claim 5 or 6, wherein the combustion-supporting fluid supply tube, the distal end side of the fuel fluid ejection section, and wherein the straight body portion is formed with a substantially constant inner diameter Powder blowing device.