Metallurgical apparatus – Process – Cooling
Reexamination Certificate
2001-03-29
2003-02-11
Andrews, Melvyn (Department: 1742)
Metallurgical apparatus
Process
Cooling
C261S115000, C266S147000, C075S381000
Reexamination Certificate
active
06517770
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a temperature control device for cooling high-temperature exhaust gas and a temperature control method for high-temperature exhaust gas.
2. Description of the Related Art
Temperature control devices are generally used to control the high-temperature exhaust gas discharged from a high-temperature gas generation source such as incinerator, melting furnace or the like to a temperature suitable for the treatment with a bag filter, in order to use it as a heat source for boiler in the subsequent step, by a wet treatment by spray of cooling water or using a scrubber. However, flying ash or dust containing a volatile component or molten dust is included in the high-temperature exhaust gas discharged from the incinerator or melting furnace, and the temperature control of such a high-exhaust gas only by cooling water spray causes the problem of the adhesion of the liquefied matter of the volatile component or the solidified matter of the molten dust to the inner wall of a temperature control tower. Further, the wet treatment has a problem in that it is disadvantageous in cost of equipment such as necessity of water treatment equipment because a water-soluble component is contained in the volatile component or molten dust.
In order to prevent the adhesion of the deposit of the inner wall of the temperature control tower, therefore, it is proposed to blow a high-temperature exhaust gas branched from an exhaust gas inlet duct obliquely upward from a purge gas blowing duct in the tangential direction of the circle formed by the horizontal section of the temperature control tower to whirl it as purge gas, or to provide an overflow dam on the upper part within the temperature control tower to fall the water overflowing the overflow dam along the inner wall.
It is also proposed to provide a plurality of high-pressure liquid injection nozzles on the wall of the temperature control tower to blow a high-pressure fluid to the inner wall of the temperature control tower through the high-pressure injection nozzles, thereby removing the adhered dust.
However, since the volatile component or molten dust contained in the high-temperature exhaust gas cannot be sufficiently cooled in the method of blowing and whirling the high-temperature exhaust gas as purge gas, the preventing effect against the adhesion of the volatile component or molten dust to the inner wall of the temperature control tower is not always sufficient. The method of falling water along the inner wall of the temperature control tower requires the water treatment equipment for treating the water-soluble component similarly to the wet treatment. The injection of the high-pressure fluid is only a mere expectant treatment, and it cannot prevent the adhesion of the volatile component or molten dust itself contained in the high-temperature exhaust gas to the inner wall of the temperature control tower.
In the case of an apparatus for incinerating and melting a waste containing metal such as a direct melting furnace of industrial waste, the adhesion of low-melting point materials of alkali metal such as lead (Pb), zinc (Zn), sodium (Na), potassium (K) and the like is more remarkable because they are contained in large quantities. In the technique of obtaining reduced iron by starting from a carbon reducing agent such as coal and an oxidized metal such as iron ore or a waste containing the oxidized metal and performing reduction or reduction and melting at a high temperature of 1000° C. or higher, particularly, the cooling of gas and the prevention of adhesion are hardly reconciled because such starting materials contain large quantities of low-melting point materials or volatile components and also generate an extremely high-temperature gas, and an effective temperature control device has not been proposed yet at the present time.
SUMMARY OF THE INVENTION
One object of this invention is to provide a temperature control device for effectively preventing the adhesion of a volatile component or molten dust to the inner wall of a temperature control tower and effectively cooling high-temperature exhaust gas, and another object is to provide a temperature control method for high-temperature exhaust gas.
According to this invention, there is provided a temperature control device having a temperature control tower for controlling a blown high-temperature exhaust gas to a proper temperature and discharging the temperature-controlled exhaust gas to the subsequent step side, the temperature control tower comprising a cooling water spray means for spraying cooling water to about the center of the gas flow of the high-temperature exhaust gas and a cooling gas injecting means for injecting a cooling gas along the inner wall of the temperature control device.
The above-mentioned temperature control device further comprises an exhaust gas inlet duct for guiding the high-temperature exhaust gas discharged from a high-temperature gas generating source to the temperature control tower, a gas blowing port provided on the upper part of the temperature control tower so as to communicate with the exhaust gas inlet duct, and a lower discharge duct for discharging the temperature-controlled exhaust gas, wherein the cooling water spray means is constituted so as to spray the cooling water downward to about the center of the gas flow of the high-temperature exhaust gas blown into the temperature control tower, and the cooling gas injecting means is constituted so as to inject the cooling gas downward along the inner wall of the temperature control tower.
In the above-mentioned temperature control device, the cooling gas injecting means is constituted so as to inject the cooling gas downward along the inner wall of the temperature control tower, a plurality of cooling gas injecting means is arranged in the vertical direction of the temperature control tower, the body wall of the temperature control tower has at least two extended step parts extended in diameter toward the lower side, and the cooling gas injecting means are provided on these extended step parts.
In the above-mentioned temperature control device, the cooling gas injecting means is arranged in the direction of injecting the cooling gas obliquely downward to the inner wall of the temperature control tower so that the cooling gas forms a downward whirling gas flow along the inner wall of the temperature control tower.
In the above-mentioned temperature control device, the cooling gas injecting means provided on the two or more extended step parts are constituted so that the cooling gas injecting means provided on the upper extended step part injects the cooling gas in the larger quantity than the cooling gas injecting means provided on the lower extended step part.
The above-mentioned temperature control device further comprises a cooling water injection control means for regulating the injection quantity of the cooling water and a cooling gas injection control means for regulating the injection quantity of the cooling gas, so that the quantity and temperature of the exhaust gas to be discharged with temperature control are constant.
The temperature control device further comprises a cooling water injection control means for regulating the injection quantity of the cooling water and a cooling gas injection control means for regulating the injection quantity of the cooling gas so that the temperature and moisture content of the exhaust gas to be discharged with temperature control are constant.
In the above-mentioned temperature control device, the exhaust gas inlet duct is formed in a reverse V-bent shape between the high-temperature gas generating source and the gas blowing means.
In the above-mentioned temperature control device, the high-temperature gas generating source is a reduced metal manufacturing apparatus for manufacturing reduced iron by starting from a carbon reducing agent such as coal and an oxidized metal such as iron ore or a waste containing the oxidized metal and performing reduction or reduction and melting
Tateishi Masataka
Tetsumoto Masahiko
(Kobe Steel, Ltd.)
Andrews Melvyn
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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