摘要:
A cryopump is provided with a detecting means for detecting an operation parameter at an elapsed operation time in a current operation cycle of the cryopump, a storing means for storing a value of another operation parameter in a past operation cycle of the cryopump as a management parameter, an arithmetic controlling means for calculating a succeeding rotational speed of the expander motor based on the current operational parameter and the management parameter stored in the storing means and outputting the same as a driving instruction signal, with which the succeeding rotational speed of the expander motor is controlled so as to maintain a temperature of a cryopanel or a pressure in a vacuum chamber to which the cryopump is attached at a predetermined value by using the operation parameter at the elapsed operation time in the current operation cycle of the cryopump detected by the detecting means and the operation parameter at the corresponding elapsed operation time in the past operation cycle of the cryopump stored in the storing means as the management parameter, and an expander motor driving means for driving the expander motor according to the driving instruction signal output from the arithmetic controlling means, whereby the cryopump may be operated stably even if a temporal load change has occurred.
摘要:
The present invention aims to provide a process and an apparatus for recovering a PFC gas, which can readily bring cooling traps to a cryogenic temperature with a low-capacity refrigerator and can recover a high-purity PFC gas by applying deep freeze separation without the need for a multistage fractionator. To achieve this object, the present invention relates to an apparatus for recovering a PFC gas from a mixed gas containing the PFC gas discharged from a vacuum processing chamber (etching chamber), comprising a cooling trap connected to the exhaust system of the vacuum processing chamber and adapted to freeze and collect a mixed gas discharged from said vacuum processing chamber, a non-PFC gas removal system for removing gases other than the PFC gas from the regenerated mixed gas emitted by vaporization of said frozen and collected gas after the operation of said cooling trap is stopped, and a recovery means for recovering a high-concentration PFC gas freed of gases other than the PFC gas in said non-PFC gas removal system, as well as a process therefor.
摘要:
A combustion type waste gas treatment system is capable of oxidatively decomposing a hazardous combustible waste gas while heating efficiently with a structure which allows the waste gas to mix with an auxiliary burning gas efficiently without the occurrence of backfire in a waste gas inlet pipe. The combustion type waste gas treatment system has a burner part and a combustion chamber. Combustion flames are formed to extend from the burner part toward the combustion chamber, and a combustible waste gas is introduced into the combustion flames from waste gas inlet pipes thereby oxidatively decomposing the waste gas. A flow velocity accelerating device makes the flow velocity of the combustible waste gas flowing through the waste gas inlet pipe higher than the burning velocity of the combustible waste gas.
摘要:
An exhaust pipe (10) includes an inner cylinder (11) having an exhaust gas passage (10′) formed therein, an outer cylinder provided outside the inner cylinder with a gap (15) being formed therebetween and a heating device (13) attached to the inner cylinder 11. The gap (15) is communicated with the exhaust gas passage (10′). When a gas is discharged from the reaction vacuum chamber, a vacuum is created not only in the exhaust gas passage (10′) but also in the gap (15). Therefore, release of heat from the heating device to the outside can be suppressed. Consequently, the inner cylinder (11) can be efficiently heated to a sufficiently high temperature, thus preventing deposition and accumulation of a substance contained in the discharged gas on the inner surface of the inner cylinder (11). The deposition and accumulation of such a substance can also be prevented by forming a gas flow layer (18) of, for example, an inert gas, along the inner surface of the inner cylinder (11.
摘要:
An exhaust apparatus in an ion implantation system for implanting impurities into a target substrate is used for evacuating an ion source chamber. The exhaust apparatus comprises at least one vacuum pump which does not use working oil for evacuating the ion source chamber, an atmospheric exhaust pipe connected to the vacuum pump for exhausting gas from the vacuum pump; and a device for introducing inert gas into at least one of the vacuum pump and the atmospheric exhaust pipe. The exhaust apparatus includes at least two vacuum pumps comprising a turbomolecular pump and a dry pump.
摘要:
A combustion type waste gas treatment system capable of oxidatively decomposing a hazardous combustible waste gas while heating efficiently with a structure which allows the waste gas to mix with an auxiliary burning gas efficiently without the occurrence of backfire in a waste gas inlet pipe. The combustion type waste gas treatment system has a burner part and a combustion chamber. Combustion flames are formed to extend from the burner part toward the combustion chamber, and a combustible waste gas is introduced into the combustion flames from waste gas inlet pipes thereby oxidatively decomposing the waste gas. A flow velocity accelerating device makes the flow velocity of the combustible waste gas flowing through the waste gas inlet pipe higher than the burning velocity of the combustible waste gas.
摘要:
A combustion type waste gas treatment system capable of oxidatively decomposing a hazardous combustible waste gas while heating efficiently with a structure which allows the waste gas to mix with an auxiliary burning gas efficiently without the occurrence of backfire in a waste gas inlet pipe. The combustion type waste gas treatment system has a burner part and a combustion chamber. Combustion flames are formed to extend from the burner part toward the combustion chamber, and a combustible waste gas is introduced into the combustion flames from waste gas inlet pipes thereby oxidatively decomposing the waste gas. A flow velocity accelerating device makes the flow velocity of the combustible waste gas flowing through the waste gas inlet pipe higher than the burning velocity of the combustible waste gas.
摘要:
The present invention provides a burner for use in a combustion-type waste gas treatment system for combusting waste gases emitted from semiconductor manufacturing system, particularly, a deposition gas containing SiH4 and a halogen-base gas, simultaneously at a high efficiency of destruction, making it difficult for a powder of SiO2 to be attached and deposited, performing a low-NOx combustion, and maintaining a desired level of safety. The combustion-type waste gas treatment system has a flame stabilizing zone (15), which is open toward a combustion chamber (11), surrounded by a peripheral wall (12), and closed by a plate (14) remotely from the combustion chamber. A waste gas, an auxiliary combustible agent, and air are introduced into and mixed with each other in the flame stabilizing zone (15), and the mixed gases are ejected toward the combustion chamber (11) perpendicularly to the plate (14).
摘要:
A combustion type waste gas treatment system capable of oxidatively decomposing a hazardous combustible waste gas while heating efficiently with a structure which allows the waste gas to mix with an auxiliary burning gas efficiently without the occurrence of backfire in a waste gas inlet pipe. The combustion type waste gas treatment system has a burner part and a combustion chamber. Combustion flames are formed to extend from the burner part toward the combustion chamber, and a combustible waste gas is introduced into the combustion flames from waste gas inlet pipes thereby oxidatively decomposing the waste gas. A flow velocity accelerating device makes the flow velocity of the combustible waste gas flowing through the waste gas inlet pipe higher than the burning velocity of the combustible waste gas.
摘要:
The present invention provides a burner for use in a combustion-type waste gas treatment system for combusting waste gases emitted from semiconductor manufacturing system, particularly, a deposition gas containing SiH4 and a halogen-base gas, simultaneously at a high efficiency of destruction, making it difficult for a powder of SiO2 to be attached and deposited, performing a low-NOx combustion, and maintaining a desired level of safety. The combustion-type waste gas treatment system has a flame stabilizing zone (15), which is open toward a combustion chamber (11), surrounded by a peripheral wall (12), and closed by a plate (14) remotely from the combustion chamber. A waste gas, an auxiliary combustible agent, and air are introduced into and mixed with each other in the flame stabilizing zone (15), and the mixed gases are ejected toward the combustion chamber (11) perpendicularly to the plate (14).