Gas separation: processes – Compressing and indirect cooling of gaseous fluid mixture to... – And liquid contact
Patent
1994-03-30
1995-12-19
Spitzer, Robert
Gas separation: processes
Compressing and indirect cooling of gaseous fluid mixture to...
And liquid contact
95214, 95228, 95237, 95288, B01D 4706, B01D 5110
Patent
active
054765366
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for removing harmful hydrocarbons, particularly plant protective aerosols and vapors, from the fresh air supplied to a vehicle cabin.
Modern tractors used currently in agriculture have, in most cases, a closed vehicle cabin. These vehicle cabins are constructed in a sound-insulating manner and usually are already connected to an air conditioning system.
Especially when plant protectives, usually pesticides or herbicides, such as atrazine, bromacil or propazine, are sprayed, it is disadvantageous that aerosols or vapors of such plant protectives are passed along into the vehicle cabin together with the fresh air that flows in and thus may have a negative or harmful effect on the health of the vehicle operator, particularly during a longer spraying operation.
It has already been suggested that air loaded with harmful hydrocarbons in smaller work spaces, e.g. cabins or work places, etc., be cleaned with active carbon filters. But the disadvantage of the use of such filters is, however, that the cleaning effect decreases greatly with an increasing load, and the complete removal of the hazardous toxic substances is no longer ensured. In addition, the disposal of the loaded active carbon filters themselves also poses problems.
SUMMARY OF THE INVENTION
The invention is based on the task of developing a simple and economical process for removing harmful hydrocarbons, particularly plant protective aerosols and vapors, from the fresh air supplied to a vehicle cabin.
According to the invention, this task is solved in that the loaded fresh air is subjected to a partial condensation with subsequent phase separation.
The process according to the invention makes it possible, in a simple manner and without generating loaded waste substances, to remove the harmful hydrocarbons from the fresh air stream of the vehicle cabin. It is only necessary to construct a type of cold trap in which the fresh air is cooled below the dew point of the components to be removed and which possesses a device for collecting and draining the obtained condensate. A standard cooling plant may be installed for providing the cold necessary for partial condensation.
According to another characteristic of the invention, if the vehicle is already equipped with an air conditioning system, it is found to be very advantageous that the cold necessary for partial condensation is coupled directly from the air conditioner cycle. It is e.g. possible that the fresh air stream is simply passed over the evaporator of the air conditioner.
Depending on the individually necessary degree of cooling of the fresh air, it may be economically sensible according to another characteristic of the invention that, in order to avoid cooling losses, the cold air stream present following the removal of the condensate is prior to its further conduit into the vehicle cabin warmed in heat exchange with fresh air which is to be cooled. This would also prevent an overcooling of the vehicle cabin.
It was found that the process of the invention is particularly advantageous in connection with a gas washing level which precedes the partial condensation and phase separation and is operated with water as a washing medium which may be taken e.g. from the fresh water tank of the plant protective spraying system. In the gas washing level, a large part of the entrained plant protective aerosols and vapors is already removed from the fresh air stream, so that the following, further treatment level is accordingly relieved. In addition, the entrained water vapor from the gas washing level causes water drops to form during the partial condensation, into which water drops the harmful plant protective particles are absorbed, so that the effectiveness of the removal is increased even more.
Further explanations regarding the invention are found in the embodiment which is shown schematically in the figure.
BRIEF DESCRIPTION OF THE DRAWING
The figure shows a tractor used for spraying plant protectives.
DETAILED DESCRIPTION OF THE D
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Holter GmbH
Spitzer Robert
Wray James C.
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