Abstract: For the sake of improving dust removal from an electrostatic precipitator by rapping, the present disclosure proposes an electrostatic precipitator, comprising a flue gas chamber, a collecting electrode, a first rapping arrangement that raps the collecting electrode, a dust hopper, and a second rapping arrangement that raps at least one of the dust hopper and an element located within the dust hopper, wherein the second rapping arrangement is located within an inner chamber defined by the flue gas chamber and the dust hopper. The rapping by means of the second rapping arrangement may comprise rapping at least one of an inner wall of the dust hopper, a structural element located within the dust hopper and connected to at least one inner wall of the dust hopper, a rapping plate located within the dust hopper proximate to an inner wall of the dust hopper, and a baffle located within the dust hopper.

Abstract: The invention relates to a device for rapping a row of collector electrodes in an electrostatic precipitator, the collector electrodes consisting of strip plates suspended from their upper ends with respect to their longitudinal extension. The aim of the invention is to provide a device for rapping a row of collector electrodes which guarantees an even supply of impact energy to the electrode plates and allows a high cleaning efficiency during rapping and a free thermal expansion in the longitudinal direction of the plates. This aim is achieved in that a gap is defined between the side of every collector electrode facing away from the rapping device and the subsequent anvil. An elastic spring element having a predetermined spring rate is arranged in said gap and is connected only on one side, either to the collector electrode or to the anvil, and is suitable to allow a substantially free oscillation of the collector electrodes between the anvils after an impact momentum.

Abstract: A method for the acceleration of an electromagnetic rapper, particularly for an electrostatic precipitator, which includes a metal cylinder as a hammer, an electrical coil for lifting the metal cylinder and a coil energizer for energizing the electrical coil. For cleaning a surface the metal cylinder is lifted by an initial electrical pulse generated by the coil energizer. The coil energizer supplies the electrical coil with an additional electrical pulse so that the metal cylinder is accelerated when it has reached the maximum point of its trajectory.

Abstract: This invention relates to electro-magnetic rappers which are used on precipitators. Such structures of this type, generally, employ the use of a wear guide which reduces rapper liner wear.

Abstract: An anvil arrangement for receiving rapper impacts and transmitting them to a discharge electrode of a precipitator has an electrode tube made of deformable material, having an open end and forming part of the discharge electrode. An anvil having a head and a shank is connected to the head and the shank has a size for insertion into the open end of the tube. The head is larger than the tube for engagement against the open end of the tube. The shank has a recess therein and at least one crimp in the tube near the open end thereof and in the vicinity of the recess of the shank for retaining the anvil to the tube. An alternate embodiment receives the electrode tube therein and engages the tube with an angled groove.

Abstract: An electrostatic precipitator of the present invention is composed of a discharge section positioned in a casing inducing gas to be treated containing unwanted matters such as dust and miscellaneous bacteria from a gas feeding duct to a gas exhaust duct and arranged in a state of crossing with a passage of the gas to be treated, and dust collecting sections each having a gas permeable configuration installed in parallel with each other at a distance in front and in the rear with respect to the discharge section, wherein a high voltage application unit is provided in the discharge section, a dust collecting chamber is provided at the lower part of the dust collecting sections, the discharge section, the dust collecting sections, the high voltage application unit and the dust collecting chamber are provided in one frame as one body, and the electrostatic precipitator is arranged to be installed freely in a row through a mounting flange provided on the peripheral surface of the frame with respect to a passage of

Abstract: An intaglio halftone gravure printing plate is made by contact-printing onto a sensitized carbon tissue a contact screen including a grid-like arrangement of minute dark dots each having the shape of a square rounded off at the four corners with the peripheries vignetted and having densities tapering from a maximum value of 3.0 at the center to a minimum value of 0.1 at the periphery, contact-printing a halftone positive onto the carbon tissue, contact-printing a light diffusion sheet and the halftone positive combinedly onto the carbon tissue, and developing the treated carbon tissue on a printing plate for subsequent etching of the cylinder.

Abstract: A method of producing gravure printing surfaces is disclosed. The method utilizes a separately produced screened negative made on orthochromatic film and a continuous tone negative. Both negatives are superimposed to produce a positive with variable size dots and variable tone densities which are then utilized to expose the carbon tissue resist used to etch the printing surface. Alternatively, the negatives are utilized to produce corresponding positives each of which is used to expose the carbon tissue.