Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With heat exchange means for non-working fluid
Patent
1997-06-23
2000-08-15
Vrablik, John J.
Rotary expansible chamber devices
Heat exchange or non-working fluid lubricating or sealing
With heat exchange means for non-working fluid
418 87, 418 89, 418 97, 418100, 418DIG1, 204272, F04C 2904
Patent
active
061026832
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a compressor installation with an injection-cooled compressor, and a method for compressing a gas in a compressor installation.
Compressors and in particular screw-type compressors are used to compress gaseous media, in particular air sucked in from the atmosphere. Generally, it is intended to provide the gas with a maximum pressure level, at a moderate temperature and free of impurities.
In order to provide the gas at a low temperature at the pressure outlet of a screw-type compressor, different liquid injection pumps have been developed for screw-type compressors. The coolant used for such injection-cooled screw-type compressors is oil, water or a chemical coolant mixture.
It is well known that with screw-type compressors, a low gas outlet temperature is generally coupled to a high efficiency. However, it is no longer tolerable in these days to trade in a good energy efficiency for a strain on the environment by hazardous substances or an excessive consumption of water.
CH-A-564 153 describes a screw-type compressor with a closed pressure cooling circuit in which oil circulates. From CH-A-564 153 it is known that the size of oil droplets and their trajectories have a substantial influence on the cooling effect Further, it is known that a fine atomization of oil droplets provides for good cooling, yet very small oil droplets make it difficult to separate the oil later on and will cause impurities in the pressure gas. The lubricant oil meant for lubrication and cooling is injected into the screw-type compressor and limits the heat-up of the gas to be compressed. Together with the compressed gas, it is led off into a precipitation vessel where the lubricant oil carried along in the pressure gas will precipitate. From the precipitation vessel, the pressure gas is led out of the compressor installation via a cooling means. The lubricant oil is returned to the compressor via a coolant conduit and an oil cooling means and it is again mixed with the gas to be compressed in the compressor. This document does address the suitability of water, yet offers no concrete hint as to a corresponding embodiment.
Using oil as the coolant and lubricant means a burden to the environment since it is impossible to clear all of the lubricant oil from the pressure gas. Moreover, such a screw-type compressor installation cannot be used in applications where a pressure gas entirely free of oil is necessary.
EP-B-0 389 036, DE-A-40 42 177 and EP-B-0 258 255 disclose concrete examples for using water as the coolant liquid. Using water as the coolant allows to avoid unfavorable impurities in the pressure gas. The presence of water itself in the pressure gas poses no problems for most applications, in particular when the pressure gas is air sucked in from the atmosphere and compressed in the compressor.
Generally, generating pressure gas goes together with a high consumption of energy. For this reason, efforts were made to reduce the energy consumption of generating pressure gas by influencing the march of temperature inside the screw-type compressor.
In the screw-type compressor of EP-B-0 389 036, the fluid is injected directly into the compressor housing in an effort to lower the energy consumption when generating pressure gas. A part of the cooling water to be injected is injected into the take-in side of the compressor, while the major part of the cooling water is injected into the compression space of the screw-type compressor at various locations with respect to the pressure increase.
According to DE-A-40 42 177, the temperature in the working chamber is intended to be reduced by providing atomizer nozzles that produce a fine atomized mist Further, these atomizer nozzles are supposed to effect a more uniform march of temperature in the working chamber.
The energy consumption of a screw-type compressor is substantially determined by the number of rotations of the rotors. The acceleration of the pressure gas particles during compression, which is a finction of the number of rota
REFERENCES:
patent: 4968231 (1990-11-01), Zimmern et al.
patent: 5033944 (1991-07-01), Lassota
patent: 5234555 (1993-08-01), Ibbott
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