A DUST-HANDLING DEVICE FOR COLLECTING AND HANDLING DUST IN A PAPER-MAKING ENVIRONMENT |
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申请号 | EP16179010.0 | 申请日 | 2016-07-12 | 公开(公告)号 | EP3269875A1 | 公开(公告)日 | 2018-01-17 |
申请人 | Valmet S.p.A.; | 发明人 | CANDUTTI, Massimiliano; LASIC, Klavdij; RUSSIAN, Marco; | ||||
摘要 | The invention relates to a dust-handling device (1) for collecting and handling dust in a paper-making environment wherein the dust-handling device (1) comprises a source of underpressure (2) and an elongated collector (3) that extends along a longitudinal axis. The elongated collector (3) is connected to the source of underpressure (2) such that underpressure can be generated inside the elongated collector (3) and the elongated collector (3) has an inlet (5) through which dust-laden air can enter the elongated collector (3) and an exit opening (6) through which dust-laden air can be evacuated from the elongated collector. The inlet (5) of the elongated collector (3) is disposed in such a relation to the longitudinal axis of the elongated collector (3) so that upon drawing the dust-laden air into the elongated collector (3), an air vortex is induced with the dust-laden air wherein the induced air vortex flows between the collector inlet (5) and the collector exit opening (6). A source of water (7) is connected to the elongated collector such that water can be introduced into elongated collector (3) so that dust of the dust-laden air can be exposed to and mix with the water introduced into the elongated collector (3). According to the invention, a dust removal device (8, 10) is mounted on the elongated collector and arranged to act against the inlet (5) to remove dust that has clogged the inlet (5).The invention also relates to a method in which dust clogging the inlet (5) is removed. | ||||||
权利要求 | |||||||
说明书全文 | The present invention relates to a dust-handling device for collecting and handling dust in a paper-making environment. The invention also relates to a method for collecting and handling dust in a papermaking environment. In a room in which a papermaking machine is used for making tissue paper, a large amount of dust is generated. For example, dust may be generated when a tissue paper web is doctored off from a Yankee drying cylinder. The dust generated can result in worker health hazards and cleanliness problems. In addition, the dust may increase the risk of fire since dust-laden air can be flammable. Therefore, it is customary to seek to evacuate dust-laden air from the area of the paper-making machine. A known device for collecting and handling dust in a paper-making environment is disclosed in The object of the present invention is to provide an improved design for dust-handling devices using the principle of introducing water. In particular, it is an object of the present invention to achieve a dust collector with improved reliability of operation. The inventors of the present invention have recognized that operation of a wet dust collector of the general type disclosed in The present invention relates to a dust-handling device for collecting and handling dust in a paper-making environment. The dust-handling device comprises a source of underpressure and an elongated collector that extends along a longitudinal axis. The elongated collector is connected to the source of underpressure such that underpressure can be generated inside the elongated collector and the elongated collector has an inlet through which dust-laden air can enter the collector and an exit opening through which dust-laden air can be evacuated from the collector. The inlet of the collector is disposed in such a relation to the longitudinal axis of the collector so that upon drawing the dust-laden air into the collector, an air vortex is induced with the dust-laden air such that the induced air vortex flows between the collector inlet and the collector exit opening. A source of water is connected to the elongated collector such that water can be introduced into elongated collector so that dust of the dust-laden air can be exposed to and mix with the water introduced into the elongated collector. According to the invention, the dust handling device comprises a dust removal device mounted on the elongated collector that is arranged to act against the inlet to remove dust that has clogged the inlet. Preferably, the inlet of the elongated collector extends in the direction of the longitudinal axis of the elongated collector. In a preferred embodiment of the present invention, the dust removal device is a blade that is hingedly connected to the elongated collector in such a way that the blade can be rotated from a first position in which it does not block the inlet into a second position such that the rotation of the blade from the first position to the second position removes dust that has accumulated at the inlet of the elongated collector. In an alternative embodiment, the dust removal device comprises at least one nozzle connected to a source of fluid which at least one nozzle is arranged to direct a stream of fluid against the inlet such that dust that has accumulated at the inlet can be blown or washed away from at least a part of the inlet. The dust removal device may be connected to an activating device that is set to activate the dust removal device at predetermined time intervals. This may be the case both when the dust removal device is a blade and when the dust removal device comprises a nozzle connected to a source of fluid. Preferably, the elongated collector has interior walls that are rounded in shape and the inlet of the collector opens into the interior of the collector so that dust-laden air which is drawn into the collector is moved by the source of underpressure substantially tangentially along an interior wall of the collector. The invention also relates to a method for collecting and handling dust in a papermaking environment. The inventive method comprising the steps of providing an elongated collector having an inlet, an exit opening and a longitudinal axis and drawing dust-laden air into elongated collector through the inlet of the collector and inducing an air vortex which flows between the inlet and exit opening of the collector. The air vortex is centered about the longitudinal axis of the collector and is formed with the dust-laden air drawn into the collector. The method further comprises introducing water into the collector such that dust in the dust-laden air is exposed to and mixes with the water so introduced. According to the invention, the method further comprises removing dust clogging the inlet by means of a dust removal device mounted on the elongated collector. In preferred embodiments, dust is removed from the inlet by means of a blade that is caused to rotate into the inlet such that dust that has accumulated at the inlet is pushed into the collector. In an alternative embodiment of the method, dust is removed from the inlet by means of a stream of fluid. In embodiments of the inventive method, dust is removed at predetermined intervals.
Reference will first be made to During operation, the elongated collector 3 is subjected to underpressure through the duct 16 and water is supplied through the duct 15 and introduced into the elongated collector 3. When the water introduced through the duct 15 is introduced into the elongated collector 3 and dust-laden air is sucked into the elongated collector through the action of the source of underpressure 2, dust particles in the dust-laden air will mix with the water and dust particles will be encapsulated by water. Air and dust particles encapsulated by water will be evacuated from the elongated collector 3 through the duct 16 and water may optionally be brought back to the source of water 7 through the duct 17 leading back to the source of water 7. Although not shown in It should be understood that the recirculation of water to the source of water 7 is optional. Embodiments are conceivable in which all water that has been used in the elongated collector 3 is simply discharged. If water is recirculated, a filter for dust particles may optionally be placed in the duct 17 and/or the duct/conduit 18. With reference to As can be seen in Preferably, the inlet 5 of the elongated collector 3 extends in the direction of the longitudinal axis of the elongated collector 3. In preferred embodiments, the collector 3 has interior walls 4 that are rounded in shape and the inlet 5 of the elongated collector 3 opens into the interior of the collector 3 so that dust-laden air which is drawn into the elongated collector 3 is caused to move by the underpressure which is generated by the source of underpressure 2 substantially tangentially along an interior wall 4 of the collector 3. An advantageous embodiment of the present invention will now be explained with reference to In If the dust-handling device has been in operation for some time, there is a risk that the inlet 5 becomes clogged. If this happens, the blade 8 is activated by the activating device 12 such that the blade 8 is rotated from a first position shown in The activating device 12 can be arranged to go into action when an operator pushes a button that is functionally connected to the activating device such that pushing the button causes that activating device 12 to turn the rod 9 such that the blade 8 performs a movement into the inlet 5 whereafter the activating device rotates the blade 8 back to its first position. In an alternative embodiment shown in Instead of the activating unit 12 being set to activate the blade 8 at predetermined intervals of time, the activating device 12 can operate as follows. With reference to An alternative embodiment of a dust removal device will now be explained with reference to It should be understood that the present invention can be described both in terms of a dust handling device and in terms of a method of removing dust from a dust-handling device. In this context, it should be understood that the terms "device" and "method" only reflect different aspects of one and the same invention. The method may thus include such steps that would be the inevitable consequence of using the inventive equipment, regardless of whether such steps have been explicitly mentioned or not. Thanks to the invention, operation of a wet dust collector can be made more reliable and the paper making machine in which the invention is used can operate with less disturbances. |