Gas separation – With nonliquid cleaning means for separating media – Solid agent cleaning member movingly contacts apparatus
Patent
1996-02-09
1998-06-30
Smith, Duane
Gas separation
With nonliquid cleaning means for separating media
Solid agent cleaning member movingly contacts apparatus
55256, 95226, 2611211, 261DIG54, B01D 4710
Patent
active
057736219
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a gas dispersion pipe for bringing a gas into contact with a liquid (including slurry), and process and device for gas-liquid contact making use of the gas dispersion pipe.
2. Background Art
A device for gas-liquid contact has been widely known (e.g. Japanese Patent Publication Nos. Sho 55-37295, Sho 57-6375, Sho 59-11322, Hei 3-70532, and Japanese Unexamined Patent Publication Nos. Hei 3-72913 and Hei 3-262510) in which a large size tank holds a liquid, a large number of gas dispersion pipes (sparger pipes), each having a plurality of gas jet holes on its lower circumferential surface are arranged in suspension into the liquid, a gas is introduced through the upper opening of the gas dispersion pipe into it and made to jet out from the gas jet holes formed in the pipe end portion to effect gas-liquid contact.
Conventional gas dispersion pipes for use in such a device as described above is of a straight pipe type with an identical inner diameter from its top to bottom end, and has a problem of unwanted pressure loss as the gas is rapidly compressed when it enters the gas dispersion pipe from the atmosphere through the top end opening of the gas dispersion pipe.
The conventional gas dispersion pipe has another problem of the pressure loss. Since the conventional gas dispersion pipe is of a structure in which the gas is jetted out horizontally through the gas jet holes formed in the circumferential wall at the bottom end portion of the pipe, the gas flowing down vertically in the pipe changes its path in the horizontal direction before flowing out from the gas jet holes. As a result, the conventional gas dispersion pipe has also the problem of the pressure loss due to the change in the direction of the gas flow from vertically down to horizontal. The pressure loss in that case is further increased when the gas flow rate in the pipe increases or liquid particles are mixed in the gas.
With the conventional gas dispersion pipe, its inner circumferential wall at its top opening gradually wears off by collision of liquid particles and solid particles contained in the gas. When such abrasion occurs, the conventional gas dispersion pipe has to be replaced entirely and the replacement requires much labor and cost.
The objects of this invention are as follows. having a reduced pressure loss when a gas from a space enters the interior of the pipe through its top opening. having a less pressure loss when the gas introduced from the top opening into the pipe jets out from the gas jet holes at the bottom portion of the pipe. which does not make it necessary to replace an entire pipe, even if its inner circumferential wall at its top opening portion wears away. dispersion pipe described above for gas-liquid contact. pipe for gas-liquid contact.
Other objects of this invention will become apparent from the following description.
SUMMARY OF THE INVENTION
This invention provides the following: its top end portion into the pipe and jetting the gas from the bottom end portion of the pipe into a liquid for gas-liquid contact, in which the top end portion of the pipe is formed in a contraction pipe structure with its horizontal cross-sectional area decreasing downward. its top end portion into the pipe and jetting the gas from the bottom end portion of the pipe into a liquid for gas-liquid contact, wherein the pipe is formed in a structure in which a contraction pipe with its horizontal cross sectional area decreasing downward is detachably connected to the top end of a straight pipe. its top end portion into the pipe and jetting the gas from the bottom end portion of the pipe into a liquid for gas-liquid contact, wherein the bottom end portion of the pipe is formed in a nozzle structure with its horizontal cross-sectional area decreasing downward. its top end portion into the pipe and jetting the gas from the bottom end portion of the pipe into a liquid for gas-liquid contact, wherein the pipe is formed in a structure in which a
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Ide Akitaka
Nisino Haruo
Urata Toshiaki
Chiyoda Corporation
Smith Duane
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