摘要:
A fiber bed separator and method are provided for separating aerosols of 3 microns and less from gases. Two fiber beds in intimate contact with one another are used. The first fiber bed, in the direction of gas flow is of fibers of at least about 5 microns mean diameter packed to a bed voidage of from about 85 to 98%, the fiber diameter and bed voidage being selected such that at design bed velocity and aerosol loading the first bed is not flooded and the residual saturation of said first fiber bed against gas drag on the liquid collected is less than the residual saturation of said bed against gravity drainage of the liquid. The second fiber bed is packed to a bed voidage of from about 85 to 99% with fibers of equal or greater mean diameter than those in the first fiber bed such that the residual saturation of said second fiber bed against gas drag is greater than the residual saturation of the bed against gravity drainage. In various preferred embodiments are high efficiency separators using fibers of from about 5 to 20 microns mean diameter in the first fiber bed and from about 25 to 35 microns in the second fiber bed; and high velocity separators using fibers of from about 25 to 75 microns mean diameter in the first fiber bed and from about 30 to 300 microns in the second fiber bed.
摘要:
This invention provides vertically disposed fiber bed elements and separators containing the same wherein "bubble re-entrainment" of a collected liquid phase in a gas stream flowing through the fiber bed is substantially eliminated or reduced. "Bubble re-entrainment" refers to that re-entrainment of liquid which occurs at the bottom of the fiber bed where the cumulative drainage of the liquid is at its maximum. This is accomplished by providing at the bottom of the fiber bed a vertically disposed gas flow baffle means such as, e.g., a baffle plate, such that some portion of the fiber bed is disposed downstream of the baffle means and shielded by the lee side of said baffle means from the moving gas stream, said shielding being effective throughout the shielded portion of the fiber bed to reduce the bed velocity of any gas flowing therethrough to below a bubble re-entraining velocity. In a preferred embodiment, the fiber bed is a bicomponent bed of two fiber beds, the first or upstream bed being of at least 5 micron mean diameter fibers, the second or downstream bed being of somewhat coarser fibers than, in intimate contact with, the first bed, and the baffle means being disposed at the interface between the two beds.
摘要:
An electrostatic filter for separating particles suspended in air has an electrically conducting elongate separation tube and an elongate electrode within the tube connected to a high-voltage direct current source to produce an electric charge current from the electrode to the tube. The tube has air-inlet openings distributed over the surface thereof and is covered with a layer of air-permeable material. The layer of air-permeable material is dimensioned and said air-inlet openings are dimensioned and spaced over the surface of the separation tube to to provide an air resistance such that substantially the same pressure drop of the air passing through the layer and the air-inlet openings to the interior of the separation tube along the whole length of the separation tube covered by the layer is created.
摘要:
An improved apparatus for treating automotive exhaust gases is described which involves the utilization of an agglomerating device coupled to a specially constructed fiber glass filter in series in an automotive exhaust system. The filter employed involves the utilization of fiber glass needled mat preferably in the form of layers of mat held in place so that gases passing through the exhaust system must pass through the matted fibers in their passage through the device.
摘要:
A rotating drum or paddle like element carrying coalescer material exposed to the airstream in an aircraft water separator, exposes the face of the material to the upstream and downstream side of the airstream so that the air flow carries away the undesirable foreign matter collected by the coalescing material.
摘要:
An electrostatic agglomeration apparatus for an air filtering and conditioning system, comprising an air duct having a pair of channels disposed either within the duct or adjacent thereto and opening into the duct at both ends. A plurality of electrically conductive rods are disposed in the channels and are charged electrically positive in one channel and negative in the other channel so that particulate matter flowing into the channels is ionized by the charges on the electrical rods and agglomerates to form larger particulate masses which are more easily filterable from the air flowing through the system.
摘要:
An apparatus for scrubbing a stream of air or other gas with a scrubbing liquid (e.g., water). The scrubbing is carried out in successive stages simultaneously with classification of the removed material, the removed material being withdrawn as separate fractions. Each stage is provided with means for scrubbing the gas with liquid droplets and by impingement with surfaces wet with liquid, and also with means for eliminating droplets whereby they are not delivered to the next scrubbing stage.
摘要:
Filtration of submicron liquid and solid particles from large volumes of gas in which the particles are carried is accomplished by passing the gas through a filter medium made up of fibers having an average diameter of up to about 10 microns at a velocity of at least 300 feet per minute and at a pressure drop not greater than 40 inches of water to remove at least 80 percent of such particles.