Gas and liquid contact apparatus – Contact devices – Liquid tank
Patent
1996-06-11
1997-10-14
Miles, Tim R.
Gas and liquid contact apparatus
Contact devices
Liquid tank
B01F 304
Patent
active
056768907
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an aeration device as claimed in the preamble of Claim 1.
Aeration devices of this type are preferably used to introduce air into waste water when it is treated to permit aerobic decomposition processes in the waste present in the water. Since the gas is always lighter than the waste water, the former must be introduced from the bottom of the container or basin, covering as wide an area as possible so that the bubbles do not merely pass through the liquid and exit at the surface. In this case, achieving the required saturation of the water would not be possible.
An aeration device which is known from EP 0 345 207 B1 comprises one or more gas distributors from the sides of which a number of inlet bodies lead. This ensures that the gas is distributed over a wide area. With the known aeration devices, such bodies are screwed to the gas distributor with connection pieces. Therefore, separate inlet bodies are needed for each side. Assembly is time-consuming due to the number of bodies which must be screwed on.
Especially in the case of long inlet bodies, movement of the waste water caused by agitators creates strains which can easily lead to mechanical damage.
Furthermore, an aeration device with which integral inlet bodies are attached to a gas distributor by means of supports extending from a central body is known from DE 36 36 882 C1. The method of attachment makes use of clamping elements which grip both the central body and receiving grooves located on the sides of the gas distributor. Each support is covered by a perforated, hose-shaped membrane fastened to the support by means of hose clamps at both ends of the membrane. The inner hose clamps simultaneously fasten the central body to the receiving grooves of the gas distributor. The liquid can flow between the central body and the gas distributor via a bored hole, and the former is enclosed by cupped inserts located approximately in the middle of the support. Outlets through which the gas can pass lead from the space between the cupped inserts to the areas where the membranes are located.
Obtaining a flow of gas into the liquid which is as even as possible, and over the outer surfaces of the membrane on the supports also, requires that the interior of the inlet bodies extend as far outward as possible. However, this produces an undesirable increase in buoyancy as a result of the larger volume of gas present in the said bodies.
The object of the invention is to create an aeration device of the type claimed in the preamble of Claim 1 which permits an even flow of gas into the liquid over the length of the membrane, at the same time with inlet bodies which are not highly buoyant, and which permits easy assembly of the aeration device and attachment of the inlet bodies to the gas distributor in a way which is subject to less strain and therefore safer.
This object is fulfilled with an aeration device as claimed in the preamble of Claim 1 with the features given in the characterizing part.
The embodiment according to the invention ensures an even flow of gas over the length of the membrane by means of the gas outlets, comprising gas feed channels in the form of longitudinal grooves. An arrangement with a central channel and two secondary channels leading from it limits the volume of gas in the inlet body, thereby reducing the amount of buoyancy. With the attachment of the inlet bodies to the gas distributor, both gas feed channels of each body are automatically fed through the gas distributor's connection to the central channel via the bored hole.
In a preferred embodiment, the wall thickness of the supports decreases from the central body to their free ends. As the bending moment load of the supports resulting from the liquid's movement caused by agitators decreases as the distance to the gas distributor increases, a reduction in the amount of material is possible without risking damage to the support.
The supports are preferably provided with outlets near the central body which are located in their upper section when ready for opera
REFERENCES:
patent: 4818446 (1989-04-01), Schreiber et al.
patent: 4954296 (1990-09-01), Ott
patent: 5304301 (1994-04-01), Schimdt
Miles Tim R.
Ott Rita
LandOfFree
Aeration device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aeration device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aeration device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1552787