摘要:
A filter cassette is disclosed, for use in an air filtering system, which has a central supporting frame, inside of which an electrostatic filtering device is mounted, and on each side of which are carrier flanges adapted to receive separate removable filtering elements. The entire filtering cassette is designed to be removed from the air filtering system for servicing; and the filtering elements supported by the carrier flanges may be varied in different installations to suit the specific filtering needs.
摘要:
A gas conditioning means and more particularly a gas conditioning means incorporating an improved method of providing sulfur trioxide for injection into a flue gas stream.
摘要:
An electrostatic dust filter is provided utilizing a fabric filtering member. The dust particles are electrically charged and are deposited on the filter member in an electric field maintained at the surface of the filter, so that the dust particles deposit in a relatively porous layer having a low pressure drop across the filter element as compared to conventional filters.
摘要:
An apparatus for clearing ventilating systems of grease vapors, odors, smoke and the like which comprises a housing having inlet and outlet passages and enclosing between these passages, sequentially in the direction of air flow, a centrifugal extractor thereby substantially reversing the airstream flow, a continuous cold water spray intersecting and directed counter to the airstream flow and a group of electrostatic precipitators. The combined action of the extractor, water spray and precipitators remove variously sized grease, vapor and smoke particles from the ventilating airstream.
摘要:
An electrostatic dust collector for exhaust gases containing fine particles having a lattice-type particle aggregating means positioned upstream of a dust collecting zone formed by a charged electrode, connected to a high voltage D.C. generator, and a dust collecting electrode maintained at ground potential, the electrodes establishing an electrostatic field therebetween, as well as a weak electrostatic field between the particle aggregating means and the charged electrode. Passage of the gas containing the fine particles through the aggregating means results in the formation of coarser particles which may be deposited upon the dust collecting electrode. Humidifying means may be provided upstream of the aggregating means to aid in the aggregating process.
摘要:
Continuous work-up of moist, phosphorus-containing residues, particularly of residues which originate from the filtration of yellow phosphorus or phosphorus-containing effluent water. To this end, intimate contact is produced, in an electrical precipitation zone adapted to free phosphorus furnace gas from dust, between the moist phosphorus-containing residue and hot dust originating from phosphorus furnace gas and covering the bottom portion of said electrical precipitation zone. Residue and dust are contacted in a quantitative ratio between 1 and 2. Resulting, substantially phosphorus-free residue is mechanically removed from the electrical precipitation zone together with dust precipitated from the phosphorus furnace gas, in the electrical precipitation zone. A phosphorus/water-mixture produced by vaporization of the moist residue is passed through the electrical precipitation zone and the mixture is introduced jointly with dust-free phosphorus furnace gas coming from the precipitation zone into a condensation zone placed downstream of the precipitation zone, wherein the mixture and dust-free phosphorus furnace gas are precipitated.
摘要:
Method and apparatus are provided for tempering exhaust or flue gases emanating from a chemical recovery furnace to maintain the gases at a temperature above the dew point thereby preventing condensation and significantly reducing corrosion. The apparatus of this invention includes a gas fired heating unit which heats up sufficient quantities of air to a temperature in excess of the dew point and directs this heated air into an exhaust duct of the recovery furnace and/or into a dust collection device, such as an electrostatic precipitator, located downstream of the recovery furnace. The introduction of heated air into the system may also be utilized to preheat the duct work and precipitator prior to initial operation of the recovery furnace to avoid condensation in a cold system during start-up.
摘要:
A method for separating dust from a gas and a gas-scrubber in which droplets of a liquid which is evaporable in the milieu prevailing in the gas are mixed with the gas, and in which the droplets ejected into the gas are electrically charged and are brought to a potential such that the surface charge density of the droplets substantially corresponds to an electric field strength equalling the brakedown field strength of the gas. The droplets thus charged and while carried by the gas are passed with the gas through a gas flow zone in which the droplets are exposed to evaporation, to cause a self-maintained discharge of the electric charge of the droplets due to a tendency of increase of field strength in the vicinity of a droplet as the droplets are diminished during evaporation. Thereby the charges carried by the droplets are transferred to the dust particles carried by the gas and thereafter the gas carrying the particles thus charged and any remaining droplets, are passed through an electric filter for separating the dust particles thus charged from the gas.
摘要:
Oil is removed from hot effluent gas by cooling the gas, scrubbing the gas in two stages, removing entrained droplets in a demister and introducing the gas into an electrostatic precipitator. After the gas leaves the electrostatic precipitator, approximately 99 percent, by volume, of the oil is removed from the gas and the gas is rendered substantially invisible. The gas is thus in a condition to be returned to the atmosphere. The apparatus consumes little energy and is relatively maintenance free in operation. A portion of the water used in a heat exchanger for cooling the gas may be used in the two scrubbing stages and recycled within the system.
摘要:
A box-like receptacle is supported in a generally horizontal plane intersecting a smoke containing heated gas stream. The receptacle is provided with vertically aligned openings in its upper and lower surfaces. Blower means within the receptacle forms a forced draft for the gas stream through the openings. An electrostatic precipitator unit is supported by the receptacle transversely of the gas stream direction of flow for collecting smoke forming particulates and cleaning the gas stream.