JP5599206B2 - Wood dust pit dust scattering suppression device - Google Patents

Description

  This invention is a wood chip pit for receiving wood wood, which is the main fuel of a biomass boiler, from a transport vehicle or the like and storing it, suppressing the scattering of wood dust and improving the environment in the wood chip pit. The present invention relates to a dust scattering suppression device.

  In recent years, from the viewpoint of effective use of resources for the formation of a recycling-oriented society and deterrence of destruction of the natural environment such as prevention of global warming, in recent years, organic resources such as wood chips and bark, that is, biomass mainly using biomass Many boilers have been used. In paper mills, trees are used to make paper, so biomass boilers that use wood chips such as wood chips and bark as the main fuel are used, and wood chips used as fuel are received in the wood chip pit. To supply biomass boilers.

  FIG. 3 is a schematic diagram for explaining the structure of the wood chip pit 1, and this wood chip pit 1 is installed underground. In order to receive biomass fuel such as wood chips, a mounting table 1a of a transport vehicle 2 that transports the biomass fuel is installed on the ground portion, and this mounting table 1a faces the entrance 1b of the wood chip pit 1. The receiving port 1b is provided in the hopper 1c, and the biomass fuel transported by the transport vehicle 2 is dropped into the hopper 1c. A receiving conveyor 3 for transporting the dropped biomass fuel to a predetermined position is disposed below the receiving port 1b. The receiving conveyor 3 faces the chute 1d of the hopper 1c, and a cover 1e is provided below the chute 1d. This cover portion 1e covers a part of the fuel feed conveyor 4 installed on the upper surface of the base concrete portion 1f at the bottom of the wood chip pit 1, and the biomass fuel that has passed through the chute portion 1d is the fuel feed conveyor 4 It falls to the position covered with the cover part 1e.

  The tip of the fuel feed conveyor 4 faces a chute 5a provided in a part of the casing of the vertical feed conveyor 5 such as a bucket conveyor disposed on the side of the wood chip pit 1. The biomass fuel transported by the fuel feed conveyor 4 is put into the casing of the vertical feed conveyor 5 from the chute 5a, transported upward by the vertical feed conveyor 5, and fed from the fuel supply port of the biomass boiler. become.

  Biomass fuel is dropped onto the receiving conveyor 3 from the receiving port 1b, and falls onto the fuel feeding conveyor 4 through the chute 1d. Therefore, dust such as wood dust dust is scattered by the impact. Since the outlet side of the cover part 1e is open, there is a possibility that the scattered dust will fly out from the outlet of the cover part 1e into the wood chip pit 1 and be scattered throughout the wood chip pit 1. The scattered dust accumulates in the wood chip pit 1 and is inconvenient if it is ignited by the heat generated by the drive motor of the fuel feed conveyor 5, etc., so that the dust does not accumulate regularly or irregularly. It is necessary to clean the inside of the wood chip pit 1. This cleaning work requires heavy equipment such as dust-proof clothing and a dust mask because the dust scattering during the work is severe and the working environment is poor, and it is a cumbersome work and a heavy labor.

  As an apparatus for preventing dust and the like from being scattered from the object to be transported by the conveyor, for example, Patent Document 1 discloses that a skirt member that regulates the load on the belt at its center is appropriately spaced from the belt surface at the lower end. A skirt structure for a belt conveyor is disclosed in which the skirt member is provided with blowing means for blowing a fluid into a gap between the belt and the central portion and the outside of the skirt member.

  Patent Document 2 discloses a discharge chute that is airtightly connected to an input port of an impact crusher and that has one end portion of a carry-in belt conveyor inserted therein, and a discharge that is airtightly connected to a discharge port of the crusher. A chute, a carry-out belt conveyor disposed at one end below the outlet of the discharge chute, and an outlet of the discharge chute are in airtight communication with the carrier side at one end of the carry-out belt conveyor over the required length. In the crushing facility comprising a hood that is airtightly covered, a duct connection chamber is provided at the upper part of the other end side of the carry-out belt conveyor in the hood, and the duct connection chamber and the input chute are connected by an air duct, upstream of the duct connection chamber. Disclosed is a crushing device in which at least three pieces of noren that divide the inside of the hood at a right angle to the conveying direction of the carry-out belt conveyor are hung from the ceiling of the hood with appropriate separation in the conveying direction That.

  Further, in Patent Document 3, a suction pipe having a dust suction port opened to suck air containing dust from a dust suction port at one end, and the other end of the suction pipe are connected to the dust pipe. Partitioned into a plurality of spaces for wetting with water and filled with water at the bottom, a discharge port for discharging the dust deposited and wet on the partition, and sucking air from the suction pipe There is disclosed a wet dust collector comprising a blower fan for installing a wet dust collector installed on a belt conveyor.

JP-A-8-319018 JP 2001-121025 JP 2001-327825 A

  The apparatus for preventing dust scattering disclosed in Patent Documents 1 to 3 described above prevents scattering of dust, dust, and the like from an object to be transported conveyed by a conveyor. For this reason, dust or the like is prevented from scattering from the conveyor skirt or hood to the surrounding environment.

  However, in the wood pit of biomass fuel or the like, a large amount of wood dust or the like generated when falling on the fuel feed conveyor is scattered in order to drop wood waste or the like from a transport vehicle or the like. The dust and the like are scattered while being conveyed by the fuel feeding conveyor. In addition, a magnetic separator for removing iron in the biomass fuel is installed on the fuel feed conveyor, and the entire area of the fuel feed conveyor cannot be covered with the cover, and a part of the fuel feed conveyor is Since it is exposed, dust and the like are scattered from the exposed portion into the wood chip pit. Also, dust may be scattered when biomass fuel falls off during transportation by a fuel feed conveyor.

The present applicant tried to install a dust collector using a bug filter as a method of removing scattered dust, but the filter was frequently clogged, and a sufficient dust collection effect could not be exhibited. Moreover, although the wood chip drop prevention plate was installed on the side of the fuel feed conveyor, it was not possible to reliably prevent the wood chips from being blown out or popped out.

  Therefore, the present invention provides a dust scattering suppression device for a wood chip pit that suppresses dust scattering as much as possible in an environment in which dust or dust is scattered, such as an accumulation chamber in which biomass fuel or the like is dropped. The purpose is to do.

As a technical means for achieving the above object, the dust splattering deterrent device according to the present invention is configured such that wood dust is introduced from an upper inlet, and the introduced wood waste is fed to the next process by a feeding conveyor. In the wood dust pit dust scattering suppression device for preventing dust generated from the wood waste pit from being scattered in the wood waste pit where the processing to be performed is performed, a pressurizing means for pressurizing the inside of the wood waste pit is provided . It is characterized by providing a shower nozzle that sprays water toward the wood chips .

When the inside of the wood chip pit is pressurized by the pressurizing means, the inside of the wood chip pit becomes positive pressure. As a result, the pressure (drop pressure) generated by being thrown in and dropped is suppressed, and the dust generated from the thrown-in wood chips and the like is prevented from scattering. Further, the water sprayed from the shower nozzle can also suppress the dust and the like flying from the thrown wood chips and the like.

  According to a second aspect of the present invention, there is provided a dust splattering apparatus for dust pits, wherein the pressurizing means is a blower, and the blower supplies outside air to the dust pits.

  The pressure generated when wood chips fall into the wood pit is very small. Therefore, it is sufficient to make the inside of the wood pit a positive pressure that opposes this pressure. It is. For this reason, a blower is used as the pressurizing means. The blower is preferably installed so as to introduce outside air, and may be provided on the wall of the wood chip pit, but is preferably provided on the ceiling.

According to the dust dispersion blocking device wood waste pits according to the present invention, by which to pressurize the inside of wood chips pits, to counteract the increase in pressure that occurs in wood chips in the pit when the wood chips or the like is turned on. For this reason, scattering is suppressed by being pressurized even if dust or the like generated from wood chips and the like is scattered. Moreover, scattering of dust etc. is more reliably suppressed by watering the thrown-in wood chips. For this reason, the frequency | count of cleaning operation | work in a wood chip pit can be reduced, and the work in a wood chip pit can be performed, without making equipments, such as dust-proof clothing, severe. In addition, since the number of cleaning operations is reduced, the stop time of the wood pit is reduced, and the operation efficiency is improved.

  According to the dust scattering control device of the wood dust pit according to the invention of claim 2, the blower can be used as the pressurizing means, and it is only necessary to install a simple facility in the existing wood dust pit. Can be improved.

It is a figure explaining the schematic structure of the wood chip pit provided with the dust scattering suppression apparatus concerning this invention. It is a schematic perspective view which shows the path which conveys the wood waste etc. which are installed in the wood waste pit. It is a figure explaining the schematic structure of the conventional wood chip pit, and is a figure equivalent to FIG.

  Hereinafter, based on a preferred embodiment shown in the drawings, a dust scattering suppression device for a wood chip pit 10 according to the present invention will be specifically described. In addition, the same code | symbol is attached | subjected about the same part regarding the conventional wood chip pit 1 shown in FIG.

  As shown in FIG. 1, a blower 12 as a pressurizing means is installed at the ceiling portion of the wood chip pit 10 so that outside air is introduced into the wood chip pit 10. The installation position of the blower 12 is not limited to the ceiling, but may be the wall portion of the wood chip pit 10 or the like, and it is preferable that outside air can be introduced into the wood chip pit 10. As will be described later, the blower 12 is not limited to the blower 12 as long as the inside of the wood chip pit 10 can be pressurized. For example, the compressed air of the compressor may be introduced into the wood chip pit 10, and in such a case, it is not necessary to introduce outside air as in the ceiling portion, and therefore, a compressed air supply pipe is provided. It only has to be installed and connected to the compressor.

  In addition, a shower nozzle 13 for spraying water into the hopper 1c is disposed above the hopper 1c.

  The wood chip pit 10 is provided with a receiving port 1b for biomass fuel such as wood chips conveyed by the transporting vehicle 2, and a mounting table 1a for the transporting vehicle 2 is installed facing the receiving port 1b. The mounting table 1a swings to a tilted state with the transport vehicle 2 mounted thereon, and the biomass fuel loaded on the transport vehicle 2 is dropped from the receiving port 1b. The receiving port 1b is formed by opening the wall portion of the hopper 1c, and a receiving conveyor 3 is installed below the receiving port 1b. The tip of the receiving conveyor 3 faces the upper part of the chute 1d. A cover portion 1e is connected to the lower portion of the chute portion 1d, and a part of the fuel feed conveyor 4 is covered with the cover portion 1e. Further, as shown in FIG. 2, the cover portion 1e has an open end on the downstream side of the fuel feed conveyor 4, and the opening 1g is made of a nolen 14 made of a flexible material such as rubber. The opening 1g of the cover portion 1e is closed by the nolen 14. When biomass fuel such as wood chips is conveyed by the fuel feed conveyor 4, the noren 14 is appropriately bent so that it can pass through the opening 1g.

  The fuel feed conveyor 4 is installed inclined with the cover portion 1e as the lower side. A belt conveyor is used for the fuel feed conveyor 4 and, as shown in FIG. 2, three guide rollers 4a, 4b, 4c are arranged in the width direction of the fuel feed conveyor 4, and a central guide roller 4b is arranged. The guide rollers 4a and 4c on both sides are inclined along the longitudinal direction with the center side being the lower side, with the longitudinal direction being substantially horizontal. For this reason, the conveyor belt 4d guided by these guide rollers 4a, 4b, 4c is in a curved state with the central portion in the width direction protruding downward as shown in FIG. The tip of the fuel feed conveyor 4 is inserted into a chute 5a of a vertical feed conveyor 5 such as a bucket conveyor, and the biomass fuel transported by the fuel feed conveyor 4 is transferred to the vertical feed conveyor 5; It is conveyed to a desired position by the vertical feeding conveyor 5.

  The operation of the dust splattering suppression device for wood pits according to the present invention configured as described above will be described below.

  The blower 12 is driven to introduce outside air into the wood chip pit 10. Thereby, the inside of the wood chip pit 10 is at a pressure higher than the atmospheric pressure and at a positive pressure.

  When the biomass fuel transported from the transport vehicle 2 is dropped from the receiving port 1b, it falls onto the receiving conveyor 3 and is transported to the chute unit 1d by the receiving conveyor 3, and the fuel supply from the chute unit 1d is performed. It is dropped on the feed conveyor 4. At this time, since the inside of the wood chip pit 10 is pressurized and maintained at a positive pressure, the falling biomass fuel receives a wind toward the receiving port 1b, and dust or the like is in the hopper 1c or the chute portion 1d. Sometimes dance. For this reason, it is suppressed that the dust etc. fly by sprinkling water from the shower nozzle 14.

  Biomass fuel falls from the chute 1d to the fuel feed conveyor 4. At this time, it falls to the fuel feed conveyor 4 in the cover part 1e, and scattering of dust and the like is suppressed by water spraying from the shower nozzle 13. Biomass fuel is conveyed to the vertical feeding conveyor 5 by the fuel feeding conveyor 4, and escapes from the cover portion 1e in the middle of the conveying area. Note that since the nolen 14 is provided at the outlet of the cover portion 1e, the inside of the cover portion 1e is closed. There is no. When the biomass fuel is transported and comes out of the cover portion 1e, the noren 14 is bent and does not hinder the transfer of the biomass fuel.

The biomass fuel that has escaped from the cover portion 1e is released into the wood chip pit 10. At this time, since the inside of the wood chip pit 10 is at a positive pressure by the air blown by the blower 12, the biomass fuel on the fuel feed conveyor 4 is pressurized and pressed down. For this reason, dust generated from the biomass fuel is also suppressed and prevented from being scattered. For this reason, it is suppressed that biomass fuel, dust, etc. fall off from this fuel feed conveyor 4 in the middle of conveyance by fuel feed conveyor 4.

  Biomass fuel is transported to the vertical feed conveyor 5 by the fuel feed conveyor 4, charged into the vertical feed conveyor 5 from the chute 5 a, and transported to a desired position such as a fuel inlet of the biomass boiler. become.

  In the above-described embodiment, the blower 12 is installed as a pressurizing unit on the ceiling portion to introduce the outside air. However, the blower may not be installed in the wood chip pit 10 to introduce the outside air. Anything that can pressurize the wood chip pit 10 may be used. However, when the air blowing direction of the blower is directed to the conveyance path of the fuel feed conveyor 4 or to the floor surface of the wood chip pit 10, dust or the like may be scattered by the wind pressure. Is the direction in which dust or the like is not scattered.

  According to the dust scattering control device of the wood pit according to the present invention, it contributes to suppressing the generation of dust in the wood pit that accumulates biomass fuel. It only needs to be improved and is suitable for preventing dust scattering in the wood chip pit.

1a Mounting table
1b Entrance
1c hopper
1d Shooting part
1e Cover 2 Transport vehicle 3 Receiving conveyor 4 Fuel feed conveyor 5 Vertical feed conveyor
10 Wood pit
11 Ceiling
12 Blower (Pressurizing means)
13 Shower nozzle
14 Noren

Claims (2)

Prevents dust generated from the thrown-in wood dust from being scattered in the wood waste pit where the wood waste is thrown in from the top inlet and fed to the next process on the feed conveyor. In the dust scattering suppression device in the wood chip pit,
A pressurizing means for pressurizing the wood chip pit is provided,
A dust scattering suppression device for a wood chip pit, which is provided with a shower nozzle for sprinkling water toward the wood chips thrown in .   2. The dust scattering suppression device for a wood chip pit according to claim 1, wherein the pressurizing means is a blower, and external air is supplied to the wood chip pit by the blower.

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