Pumps – One fluid pumped by contact or entrainment with another – Liquid pumped by supplying or exhausting gaseous motive...
Patent
1998-05-19
2000-07-18
Bennett, Henry
Pumps
One fluid pumped by contact or entrainment with another
Liquid pumped by supplying or exhausting gaseous motive...
417126, 4174241, 1375123, F04F 106
Patent
active
060898291
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pump for discharging hot corrosive liquids, in particular molten salts, consisting of a pump pipe, a discharge pipe dipping into the liquid and at least two valves whereby the liquid is discharged periodically by pressurisation.
In various chemical production processes, for example, in the Deacon Process using inorganic molten salts for the direct oxidation of HCl to chlorine, molten salts have to be conveyed into a forced circulation system in order, for example, that they can be discharged over a large area in a trickling-film reactor under reaction conditions. The operating conditions, which require an operating temperature of about 500.degree. C., are exacting; a particular problem of the above-mentioned process is the high corrosiveness of the KCl/CuCl melt, which permits only ceramic, for example quartz glass, to be used as reactor material.
Two types of process have hitherto been employed for the discharge of hot aggressive molten salts.
In the unpublished German Patent Application under the file number P 44 32 551.7 it is proposed, for example, that a molten salt be pumped by means of a full ceramic gear pump. The pump is driven magnetically coupled, with special attention having to be paid to the sealing between the pump region and the coupling region, in order that no molten salt can enter the coupling region, where it would cause damage through corrosion.
The disadvantage of this pump is moreover the high weight of the pump unit, which interacts with the relatively sensitive reactor unit.
In the unpublished German Patent Application, file number P 44 40 632.0 the pneumatic discharge of a molten salt is proposed as an alternative pumping process.
For this the sump of the reactor is subjected to periodically timed pressurisation by educt gas, so that the melt can be discharged via an ascending pipe into an overhead vessel, in order there to flow down again via the wetted-wall column into the reactor. A nozzle in the inlet to the sump renders possible the build-up of pressure and prevents an excessive bypass stream. The disadvantage of this process is the periodic pressurisation of the ceramic reactor vessel, as a result of which the vessel approaches its loading limit, with the danger of a leakage and the necessity of an overhead vessel to even out the flow of the molten salt.
The object was to construct a pumping device for aggressive liquids, in particular for molten salts, which does not have the disadvantages of the above-mentioned pumps.
It is to be possible to place the pump, in a manner comparable with a simple immersed pipe, into a storage vessel or reactor. The pump should contain as few structural elements as possible and operate largely without mechanical or externally electrically moving parts and should render pressurisation of the reactor unnecessary.
The object is achieved according to the invention by a device for the discharge of in particular hot, corrosive liquids, in particular molten salts, consisting of a pump pipe equipped with a gas inlet and a gas outlet, a discharge pipe for the liquid having an open end dipping into the liquid and optionally arranged coaxially to the pump pipe, and of at least two valves, with openings between pump pipe and discharge pipe being provided between the said valves, the valves being opened by the respective liquid flow and closing in the direction of gravity.
In a particular embodiment of the device, the use of different valves wherein the two valve closing parts are of differing density is advantageous for the smooth operation of the discharge. The closing part of the lower valve (inlet valve) should rise as easily as possible, in order to render possible the inward flow of the liquid (melt). It should have a density only a little more than that of the liquid to be discharged.
The closing part of the upper valve, however, should as far as possible open only during the actual discharging process and should otherwise close securely, in order to prevent a back flow of the fluid, for example a molten salt, during the r
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Gestermann Fritz
Herold Heiko
Janssen Hans-Georg
Potes Willi
Bayer Aktiengesellschaft
Bennett Henry
Shulman Mark
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