Abstract: The invention relates to a sealing device in a cylinder drier, intended for incorporation in a paper machine and including a plurality of cylinders arranged in two substantially parallel rows (1a,1b), the paper web (2) being trained serpentine about said cylinder during drying, said web being carried by an endless porous Fourdrinier drier (3) adapted for pressing the web against the cylinder surfaces in one row of cylinders and situated between the paper web and the cylinder surfaces in the other row. Two shielding members (7,15) being disposed in the space restricted by the wire and an intermediate cylinder surface on that cylinder which the wire and the web come onto and leave. Said shielding members facing the wire and extending substantially in parallel with and close to the wire and over the entire width of the web.

Abstract: A paint spray booth enclosure has separate zones defined by air curtains, one zone being polluted differently than another. A separate flow of ventilating air is passed through each zone. Each zone has its own separator for cleaning exiting air of its pollutant. In the illustrated embodiments, the outer zones have dry separators and the central zone has wet separator. Suitable conduits permit total or partial recirculation of the cleaned air, or total exhaust of the air to the atmosphere. Fresh outside air may be supplied to the ventilating flows along with spent ventilating air from the plant. Suitable controls for the air are provided.

Abstract: A method and device for varying a d.c. voltage connected to an electrostatic dust separator so as to render more effective, in return for a low consumption of energy, the collection of dust on an electrode or electrodes incorporated in the dust separator. The d.c. voltage is set to a first level (basic level), said level having superimposed on it a number, in each case two or more, of voltage pulses forming a pulse group, with the consecutive pulse groups being separated from each other in a time sequence and supplied to electrodes incorporated in the dust separator.

Abstract: A rack contains a number of shelves arranged on top of each other, which carry, among other things, board magazines with printed circuit boards. An apparatus for cooling the aforesaid printed circuit boards containing telecommunications or electronic equipment in each rack is based on the principle that one or more shelves in the rack are integrated each with its own heat exchanger, which is equipped with cooling flanges and at least one tubular coil. The heat exchanger is connected to a cooler for a coolant. The heat exchanger covers the greater part of the horizontal plane of the shelf. Heat-transfer members with extensive heat-conducting contact surfaces are provided between the board magazines and the body of the shelf and between the latter and the heat exchangers.

Abstract: The invention relates to an absorption tower (so-called scrubber) for gas washing in which the gas is introduced into the lower portion of the tower and flows upwards while making contact with a washing fluid. The tower (4) is provided with one or several washing stages (6-9), each comprising one or several venturi tubes (10) through which the gas is given a speed increase and the washing fluid is discharged through fluid nozzles (25) in the gas flow path. The venturi tubes in each washing stage are led through a common collecting baffle (11) for washing fluid which is then recirculated to the nozzles. Means (26,28,29) for liquid distribution are disposed in the upper portion of each venturi tube (10) and are arranged for fluid distribution in the gas flow in directions forming such angles to the vertical that the fluid flow will not fall backwards into the openings of the venturi tubes even if the gas flow through the tower is interrupted.

Abstract: An exhaust air valve for placement in a ventilation conduit through which air is exhausted from a space to be ventilated. The valve has a casing with a concave seat surface facing upstream of the flow through the conduit and having a central valve orifice. A convex valve element cooperates with the seat surface and when the valve is closed engages the seat surface along a line of contact surrounding the seat. The curvature of the respective surfaces is the same, at least along the line of contact to ensure a tight closure of the orifice by the valve body. When opening, the valve body slides along the curved surface and the upstream surface of the valve body exposed to the flow is also convex to guide the flow toward the center of the orifice. Several embodiments are illustrated including valves with cords for remotely controlling the valve and heat-sensitive tripping mechanisms which automatically close the valve in the event of a rise in temperature above a preset level.

Abstract: A system and method for controlling energy input to a series of electrostatic dust separator devices having a common gas inlet and a common gas outlet. A detector unit is disposed in the gas outlet to detect the dust concentration or evaluate the actual dust loss in the exhausted gas. Energy control circuitry is coupled with each separator device to control the energy input to each separator device. The control circuitry is actuated by an actuating device to first change and then restore the energy input to each of the separator devices in a selected sequence to thereby change and restore the dust concentration in the exhausted gas. Computation circuitry is coupled with the detector unit to compute the change in dust concentration resulting from a certain change in energy input to each of the separator devices in the sequence.

Abstract: A control device for an electrostatic dust separator (10,11) intended to control in relation to the recorded level of direct current (104) and direct current voltage (102) in the dust separator and with the help of the supply voltage (6a) passes through the zero point the switching in and/or out of the rectifiers (8, 8a) wired into the power supply lead (6a) to the dust separator, usually in the form of two thryistors. The recorded value for the current (104) and the recorded value for the voltage (102) together with the information in respect of the passage through zero of the supply voltage (100) are connected directly via conversion circuits (25, 26) to a data processing unit (112).

Abstract: Apparatus for mounting supply and exhaust air valves or other ventilation elements in ventilation conduits comprising one or several anchor devices which are attached by a base onto the back side of the element. From the base extends a triangular intermediate section. One triangle side borders the base, and a second triangle side borders an outward extending wing with circumferential orientation relative to an opening in which the element is to be fastened. The wing is divided by slots into tongues, and the free ends of the tongues are pointed and bent outward in direction toward the walls of the opening. Different configurations of the anchor devices are shown.

Abstract: A cylinder dryer usually includes a plurality of heated cylinders (4) about which a web-like material (1) is taken in a zig-zag mode and pressed against certain of the heated cylinder surfaces by means of an endless high-permeability wire (3), whereby cylinder pockets are formed between the cylinders (4), web (1) and wire (3), when the latter relinquishes contact with the web at a cylinder surface (6) to pass over a return roll (7) arranged between the cylinders, and once again makes contact with the web at the next following cylinder circumference (8). According to the invention these cylinder pockets are ventilated by a flow of drying air from a blowing box (9) being blown over the width of the wire against its surface facing away from the cylinder, in a direction forming an acute angle to and having a directing component substantially counter to the direction of travel of the wire. Blowing is carried out thereby within an area (6) where the wire relinquishes contact with the web.

Abstract: A heat exchanger for the extraction and re-use of heat and/or moisture from gas flows comprising: a housing (3) forming a duct section for gas flows; a rotor (7) which has a plurality of air passages extending therethrough; and a guide arrangement (9, 10, 11) for carrying the rotor (7), which arrangement is movable laterally of the housing (3) to carry the rotor (7) between an inserted position and an at least partially extracted position. A drive (21) for driving the rotor (7) can be movable jointly with said rotor (7). In an expedient embodiment, the rotor bearing is located, optionally together with the drive, on a support member (10, 11) which is stiff against both torsion and bending and which is movable on guide rails. This support member extends expediently by means of two carrying members (10) next to the two major faces of said rotor (7), which are movable on said rails in the housing (3).

Abstract: Purification of gases from acid gas components according to the dry method means that the gas is contacted with an absorbent in a solid phase, which yields a relatively low reaction rate. In order to increase the reaction rate according to the invention, the gas is contacted with a mixture consisting partially of a solid absorbent phase and partially a liquid phase on the surface of the solid phase. At the purification of flue gases from sulphur dioxide hot gas is contacted with an absorption liquid in a drying apparatus, where evaporation of the water supplied and a reaction between sulphur dioxide and the absorption substance take place simultaneously, whereafter the solid product phase is separated from the gas in a dust separator and a slower, secondary absorption reaction is operative.

Abstract: Method and apparatus for improving the operation of forced-air-cooled steam condensors having a bank of air-cooled heat exchangers connected between steam lines and condensate conduits. Air is forced through the heat exchangers by fans and shutters are provided to either discharge the spent air to atmosphere or to recirculate the spent air into the fan inlets to mix with fresh outside air. The steam pressure in the steam line is sensed along with the temperatures of the condensate in each exchanger and of outside air. The condensate conduits are in the recirculation path of spent air, and the fan is adjustable to control the quantity of air forced through the exchangers. By controlling the shutters and the fans in response to the pressure and temperatures, a highly-efficient cooling effect is achieved.

Abstract: This invention relates to a device at a dust filter for cleaning a gas flow from dust. The dust filter consists of an electrostatic precipitator or fabric filter (bag filter) and comprises a filter chamber (10) with gas inlet (12) and gas outlet (13). At the gas inlet a precollector (30) in the form of a louvre collector (31) is located for separating coarse dust, i.e. dust with a diameter exceeding 50-75 microns. In the order to obtain good collection at the louvre collector (31), the collected dust is evacuated by means of a partial gas flow, which is passed to a dust hopper (34) and a dust discharge unit (35). According to the invention, the dust discharge unit (35) comprises a cyclone collector (36), the inlet portion (37) of which is integrated with the dust hopper (34), and the outlet portion of which or central pipe (38) is formed with a passageway (39), the mouth (40) of which is located in the filter chamber downstream the louvre collector.

Abstract: The invention relates to a method of and apparatus for conditioning the atmosphere of a space, in which ventilating air of the space 3 is mixed with heated or cooled air by induction round clusters of jets 8 which are fed with heated or cooled air from an independent source of air including a fan 5 and a heater or cooler 6.

Abstract: A method and apparatus to recover thermal energy from the exhaust air from a paint spray booth for painting of automobile chasses, whereby heat from the relatively warm exhaust air is transferred to the relatively cold supply air to the booth. The outgoing air is mixed with water or other heat-exchange liquid, and the liquid is then separated in a separation-chamber (7) adjacent the ventilation outlet (6) of the booth (5), and is circulated between the chamber and a heat exchanger (2'), through which the supply air flows.

Abstract: The invention relates to a method of and apparatus for separating liquid from solids entrained therein, which solids, preferably paint particles emanating from a paint spray booth are capable of floating on the liquid. The liquid and solids are entrained in a collector which is open to atmosphere and in which a Coanda - type flow prevails so that the solids are collected as a skin on the surface of the liquid. In one embodiment the level of the liquid is raised so that the skin slips over a lip and out of the collector, leaving the liquid behind; in another embodiment the skin is collected behind a restraining device which is moved to allow the skin to flow through an outlet therefor, again leaving the liquid behind.