Fluent material handling – with receiver or receiver coacting mea – Diverse fluid containing pressure filling systems involving... – Filling with exhausting the receiver
Patent
1998-02-03
2000-04-11
Jacyna, J. Casimer
Fluent material handling, with receiver or receiver coacting mea
Diverse fluid containing pressure filling systems involving...
Filling with exhausting the receiver
141 7, 141 45, 141290, B67D 504
Patent
active
060477458
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method of recovering vapor emitted by an installation for dispensing a liquid while said liquid is being dispensed into a tank.
The invention finds a particularly advantageous application in the field of dispensing fuel for motor vehicles, for example, for recovering the hydrocarbon vapor that escapes from the tank of the vehicle while it is being filled with liquid fuel.
BACKGROUND OF THE INVENTION
An installation for dispensing liquid such as fuel for motor vehicles generally comprises means for dispensing said liquid essentially comprising volumeters fitted with pumps adapted to cause the fuel to flow with a liquid flowrate Q.sub.L between a storage tank and the fuel tank of the vehicles. The volumeters also include a liquid measuring device connected to a pulse generator enabling a computer to establish the volume and the price of the fuel delivered, which are shown in the clear on a display with which the volumeters are equipped.
If the hydrocarbon vapor emitted is to be recovered, said installation includes recovery means adapted to cause said vapor to circulate with a vapor flowrate Q.sub.V along a pipe between the vehicle fuel tank and a recovery tank, for example the storage tank, the vapor flowrate Q.sub.V being controlled by a parameter G characteristic of said recovery means so as to maintain between the vapor flowrate Q.sub.V and the liquid flowrate Q.sub.L a relation of proportionality Q.sub.V =kQ.sub.L with k equal to or close to 1.
Said recovery means usually comprise a pump aspirating the vapor from the fuel tank in order to return it to the hydrocarbon storage tank. The characteristic parameter G is the rotation speed w of said pump which is controlled by the pulse generator of the dispensing means.
However, in most cases there is no simple way to impose a pump speed w proportional to the liquid flowrate Q.sub.L.
Operating conditions can differ greatly from one installation to another, in terms of: generate within the latter a pressure different from atmospheric pressure and corresponding to an additional hydraulic resistance on the recovery pipe, pressure difference, which affects its efficiency.
To summarize, to obtain a given vapor flowrate Q.sub.V, it is necessary to impose on the recovery pump a rotation speed w that depends on the installation.
To allow for the parameters mentioned above it is standard practice to calibrate the complete installation when installed on the site. During this calibration a recovery pump speed w is fixed and the corresponding vapor flowrate Q.sub.V is measured using a flowmeter or a gas meter. A table (w, Q.sub.V) is drawn up in this way relating the speed w and the vapor flowrate Q.sub.V with a sufficient number of points to define the characteristic of the pump under these operating conditions. This table is stored in memory in a microprocessor.
In normal operation, the flowmeter is removed and, during dispensing of hydrocarbons at a liquid flowrate Q.sub.L, the microprocessor looks up in the table the speed w to be imposed on the recovery pump such that Q.sub.V =Q.sub.L.
This prior art recovery method has the following disadvantages, however: presence of hydrocarbons. This applies in particular to the part of the pipe upstream of the pump, which generally comprises an elastomer tube surrounded with pressurized liquid, this part representing the core of a coaxial hose. pumps, for example. temperature of the vehicle fuel tanks, which modifies the effect of the upstream and downstream head losses. the hydrocarbons and the temperature.
SUMMARY OF THE INVENTION
The technical problem to be solved by the present invention is that of proposing a method of recovering vapor emitted in a liquid dispensing installation when dispensing said liquid into a tank, said installation comprising: flowrate Q.sub.L between a storage tank and said tank, flowrate Q.sub.V along a pipe between said tank and a recovery tank, said vapor flowrate Q.sub.V being controlled by a parameter G characteristic of said recover
REFERENCES:
patent: 5038838 (1991-08-01), Bergamini et al.
patent: 5156199 (1992-10-01), Hartsell, Jr. et al.
patent: 5332008 (1994-07-01), Todd et al.
patent: 5417256 (1995-05-01), Hartsell, Jr. et al.
patent: 5507325 (1996-04-01), Finlayson
patent: 5542458 (1996-08-01), Payne et al.
Jacyna J. Casimer
Knuth Randall J.
Tokheim Services France
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