We Claim:
1) A deliquescent solid feeding device for a device for drying a fluid in liquid or gaseous form, said drying device comprising an enclosure (14) with temperature and pressure conditions different from atmospheric, a deliquescent solid bed (24), an inlet (30) for a fluid to be treated and an outlet (42) for the treated fluid, characterized in that the feeding device comprises an air lock (44) containing deliquescent solids, the air lock (44) being provided with a vent (52) controlled by a valve (53), said air lock (44) allowing gaseous fluids present during loading to be driven out and being in airtight condition when a cover (50) is positioned in place, a device (46) for driving the solids from air lock (44) to the inside of enclosure (14) and throttling means (62) arranged on the drive device.
2) A feeding device as claimed in claim 1, characterized in that drive device (46) comprises a pipe (56) for delivery of the solids into enclosure (14) and a line (64) for circulation of the solids towards the pipe, and throttling means (62) are arranged between the pipe and the line.
3) A feeding device as claimed in claim 1 or 2, characterized in that throttling means (62) is a full-opening isolating ball valve.
4) A feeding device as claimed in claim 2, characterized in that pipe (56) is inclined at an angle (α) preferably ranging between 25° and 80° to the horizontal, more preferably at an angle ranging between 45° and 70°, and most preferably at an angle ranging between 40° and 60°.

5) A feeding device as claimed in claim 2, characterized in that circulation line (64) is provided with a mechanical drive (66) for the solids.
6) A feeding device as claimed in any one of claims 2 to 5, characterized in that the circulation line is provided with an endless screw (66) actuated by a rotating device (68).
7) A feeding device as claimed in any one of claims 2 to 6n characterized in that circulation line (64) is provided with a purge means (72).
8) A deliquescent solid feeding method for a device for drying a fluid in liquid or gaseous form, said drying device comprising an enclosure (14) with temperature and pressure conditions different from atmospheric, a deliquescent solid bed (24), an inlet (30) for a fluid to be treated and an outlet (42) for the treated fluid, characterized in that the method consists in:
- monitoring the solid level in bed (24),
- in case of a solid level below a threshold, in providing communication between enclosure (14) and a solid feeding device (12) comprising an airlock (44) provided with a vent (52) controlled by a valve (53), said air lock (44) allowing gaseous fluids present during loading to be driven out and being in airtight condition when a cover (50) is positioned in place so as to obtain a pressure and a temperature in the feeding device substantially identical to those prevailing in the enclosure,
- circulating the solids from the feeding device to the inside of the enclosure until the desired solid level is reached,
- once the level reached, in stopping the solid circulation and in isolating enclosure (14) from the solid feeding device.

9) A deliquescent solid feeding method as claimed in claim 9, characterized in that it consists in supplying the feeding device with deliquescent solids after isolating it from the enclosure.
10) A deliquescent solid feeding method as claimed in claim 8 or 9, characterized in that it consists in purging the feeding device after isolating it from the enclosure.

11) A deliquescent solid feeding method as claimed in claim 10, characterized in that it consists in putting the feeding device under atmospheric pressure so as to discharge through gravity, using a purge means (72), the residual fluid contained therein.
12) A deliquescent solid feeding method as claimed in claim 10, characterized in that it consists in introducing a neutral gas under pressure in the feeding device so as to discharge through a purge means (72) the residual fluid contained therein.
13) A deliquescent solid feeding method as claimed in claim 12, characterized in that it consists in introducing nitrogen under pressure in the feeding device.
14) A deliquescent solid feeding method as claimed in any one of claims 1 to 7, characterized in that the feeding device is detachable from the enclosure.
15) A deliquescent solid feeding method as claimed in any one of claims 1 to 7, characterized in that the feeding device is usable on other enclosures.