Gas separation: apparatus – Degasifying means for liquid – Pressure reducing means
Reexamination Certificate
1999-09-15
2001-09-25
Smith, Duane S. (Department: 1724)
Gas separation: apparatus
Degasifying means for liquid
Pressure reducing means
C065S134200, C065S134900, C095S266000, C096S201000
Reexamination Certificate
active
06294005
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vacuum gas releasing system, in particular a vacuum gas releasing system for removing bubbles in a high temperature molten matter, such as molten glass and metal, in a refining process for the high temperature molten matter.
2. Discussion of Background
As a vacuum degassing vessel, vacuum degassing vessels of siphon type, horizontal type, and so on are known. JP-A-3-33020 discloses an example that a vacuum degassing vessel of siphon type is applied.
In JP-A-3-33020, a vacuum degassing apparatus for molten glass mainly consisting of a melting tank, a rise tube, a vacuum degassing vessel, a down comer, and a storage tank. Molten glass, which has not been degassed, is stored in the melting tank, led from the riser tube to the vacuum degassing vessel, and degassed in the vacuum degassing vessel. The degassed molten glass is led from the down comer to the storage tank, and led to a forming process. This is a flow of the molten glass in the above vacuum degassing apparatus for molten glass.
Ordinarily, the vacuum degassing vessel is run under a depressurized state lower than the atmospheric pressure. Therefore, in the vacuum degassing vessel, a sealing mechanism for preventing air from leaking from the atmosphere to the vacuum degassing vessel is provided. However, because the above sealing mechanism can not sufficiently maintain a hermetical condition, leakage still occurs to a certain extent.
Therefore, a vacuum pump is connected to the conventional vacuum degassing vessel through a gas release pipe to suck air as much as a leaked quantity or more from the atmosphere by the vacuum pump for maintaining a degree of depressurizing in the vacuum degassing vessel.
Further, because it is difficult to stably maintain the degree of depressurizing using only the vacuum pump, an atmosphere leakage valve is connected to the vacuum degassing vessel to control an opening degree of the atmosphere leakage valve and the revolutional number of the vacuum pump, whereby the degree of depressurizing is stably maintained.
However, because in the conventional vacuum degassing vessel, the leakage valve is directly connected to the vacuum degassing vessel, there are the following problems. Namely, when the leakage valve is released, an outer air is introduced into the vacuum degassing vessel; a temperature in the vacuum degassing vessel is decreased; and the vacuum degassing vessel is unstably operated. Further, there is a problem that a gas releasing system is troubled and the vacuum degassing vessel is unstably operated because a large quantity of various volatile matters, such as water, SOX gas, carbon generated in the vacuum degassing vessel, are evacuated to the gas release pipe when an outer air passes through the vacuum degassing vessel.
Further, the volatile matters generated in the running vacuum degassing vessel intrudes into the gas release pipe along with a high temperature gas in a state of gas, liquid, and solid, even though the leakage valve connected to the vacuum degassing vessel is closed. Conventionally, there is a problem that the volatile matters chokes the gas release pipe, and resultantly the vacuum degassing vessel is unstably operated.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the above-mentioned problems inherent in the conventional technique and to provide a vacuum gas releasing system, which can stably operate a vacuum degassing vessel by improving a position of installing a leakage valve and preventing a temperature in the vacuum degassing vessel and the large quantity of volatile matters from changing and discharging.
Another object of the present invention is to provide a vacuum gas releasing system, which can stably operate a vacuum degassing vessel by removing volatile matters generated in the vacuum degassing vessel.
According to a first aspect of the present invention, there is provided a vacuum gas releasing system comprising a vacuum degassing vessel for degassing high temperature molten matters, a vacuum pump for sucking a high temperature gas in the vacuum degassing vessel and reducing a pressure in the vacuum degassing vessel when it is actuated, the vacuum pump is connected to the vacuum degassing vessel through a gas release pipe, a cooling device for cooling the high temperature gas sucked from the vacuum degassing vessel by the vacuum pump, the cooling device is located in the gas release pipe, a leakage valve, attached to the gas release pipe positioned between the cooling device and the vacuum pump, releases the gas release pipe to the atmosphere when it is opened, and a control device for controlling an opening degree of the leakage valve and the revolutional number of the vacuum pump to control a degree of depressurizing of the vacuum degassing vessel. According to this aspect, the vacuum degassing vessel is not released to the atmosphere even though the leakage valve is opened because the leakage valve is located in the gas releasing pipe positioned between the cooling device and the vacuum pump to thereby stably operate the vacuum degassing vessel by constantly maintaining a temperature in the vacuum degassing vessel and avoiding discharge of a large quantity of volatile matters into the gas release pipe; and volatile matters of a high temperature gas sucked by the vacuum pump are diluted with an outer air introduced from the leakage valve to thereby prevent a trouble of a gas releasing system caused by the volatile matters having a high concentration from occurring.
According to a second aspect of the present invention, there is provided a vacuum gas releasing system further comprising a plurality of gas releasing systems including a vacuum pump, a cooling device, a leakage valve and a control device, the gas releasing systems are switchably used, whereby while one gas releasing system is used, the other gas releasing systems can be maintained. Because a released gas from the vacuum degassing vessel contains a substance causing clogging of a gas releasing pipe, it becomes possible to continuously operate the vacuum degassing system and prolong a lifetime of the vacuum degassing system by switching to use the plurality of gas releasing systems.
According to a third aspect of the present invention, there is provided a vacuum gas releasing system further comprising a tank kept to be a vacuum by actuating a vacuum pump located between the vacuum pump and a cooling device, whereby the tank is substitutionally used for the vacuum pump when the vacuum pump is stopped in an emergency. This is because the tank is kept to be a vacuum, the tank has a function of sucking a leaked air, which function is similar to that of the vacuum pump for depressurizing the vacuum degassing vessel. In this case, by locating a shut-off valve between the tank and the vacuum pump so as to shut the tank from the atmosphere by closing the shut-off valve, it is possible to sufficiently demonstrate the above function of the tank.
According to a fourth aspect of the present invention, there is provided a vacuum gas releasing system comprising a vacuum degassing vessel for degassing a high temperature molten matters, a vacuum pump for sucking a high temperature gas in the vacuum degassing vessel through a gas releasing pipe by actuating this and depressurizing the vacuum degassing vessel, which vacuum pump is connected to the vacuum degassing vessel through the gas release pipe, and a volatile matter removing device for removing volatile matters sucked from the high temperature gas in the vacuum degassing vessel by the vacuum pump, which volatile matter removing device is located in the gas releasing pipe, whereby the volatile matters are not clogged in the gas release pipe because the volatile matter removing device is located in the gas release pipe and the volatile matters in the high temperature gas generated by the vacuum degassing vessel are removed by the volatile matter removing device. Thus, the vacuum degassing vessel can be stably operated.
According to a fi
Inoue Shigekuni
Ishimura Kazuhiko
Takei Yusuke
Uchino Kosei
Asahi Glass Company Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Smith Duane S.
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