Ventilation system

Abstract

This invention provides a ventilation system that can prevent indoor temperature rise while preventing the entry of dust such as biomass pellets into the room. [Solution] The ventilation system 50 is a ventilation system 50 for adjusting the temperature of a bunker hydraulic and electrical room located inside a building 20 where a conveying device 40 for transporting fuel containing biomass pellets is installed. The ventilation system 50 includes an intake port 500 located on the roof of the building 20 and communicating with the bunker hydraulic and electrical room 200 via a first pipe 550, an exhaust port 510 located on the roof of the building 20 and communicating with the bunker hydraulic and electrical room 200 via a second pipe 552, and a ventilation device 530 that blows air into the bunker hydraulic and electrical room 200. The ventilation device 530 blows air drawn in from the intake port 500 into the bunker hydraulic and electrical room 200, thereby creating a positive pressure inside the bunker hydraulic and electrical room 200.

Description

Technical Field

[0001] The present invention relates to a ventilation system.

Background Art

[0002] In recent years, for the purpose of reducing carbon dioxide emissions, biomass power generation that generates electricity by using biomass pellets or a mixture of biomass pellets and coal as fuel has become widespread (see Patent Document 1). Fuels such as biomass pellets are conveyed from a fuel receiving facility or the like to a bunker by a belt conveyor. In the building where the belt conveyor is installed, a bunker hydraulic and electrical room is provided for accommodating a hydraulic unit that hydraulically controls the belt conveyor and the like.

[0003] The temperature inside the bunker hydraulic and electrical room rises due to the operation of the motor. As a result, although the appropriate temperature of the oil in the hydraulic unit inside the bunker hydraulic and electrical room is 40°C, there is a problem that the temperature of the oil also rises as the indoor temperature rises. Conventionally, in order to maintain the oil in the hydraulic unit at an appropriate temperature, outdoor air is introduced into the room. Specifically, a ventilation device is provided near an exhaust port provided on the roof of the bunker hydraulic and electrical room, and the ventilation device is operated to make the inside of the bunker hydraulic and electrical room negative pressure, thereby introducing outdoor air from an intake port provided on the roof.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, with conventional technology, creating negative pressure inside the bunker hydraulic and electrical room allows outside air to be introduced through the rooftop air intake, and dust such as biomass pellets scattered around the bunker hydraulic and electrical room enters the room through gaps in doors, etc. In this case, the dust that enters the bunker hydraulic and electrical room frequently causes problems such as overload trips due to clogged ventilation filters and hydraulic unit trips due to malfunctions of relays in the control panel.

[0006] Therefore, the present invention aims to provide a ventilation system that can prevent the temperature inside a room from rising while preventing dust such as biomass pellets from entering the room, in order to solve the above problems. [Means for solving the problem]

[0007] The ventilation system according to the present invention is A ventilation system for adjusting the temperature of a room located inside a building equipped with a conveying device for transporting fuel containing biomass pellets, An air intake is provided on the roof of the aforementioned building and communicates with the interior of the building via a first pipe, An exhaust port is provided on the roof of the aforementioned building and communicates with the interior of the building via a second pipe, The room is equipped with a ventilation device that blows air into the room, The ventilation device creates a positive pressure in the room by blowing air drawn in from the intake port into the room. [Effects of the Invention]

[0008] According to the present invention, by creating positive pressure in the room using a ventilation device, it is possible to prevent biomass pellet dust from entering the room, and by blowing air into the room using the ventilation device, it is also possible to prevent the room temperature from rising. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows an example of a schematic configuration of the biomass power generation system according to this embodiment. [Figure 2]This figure shows an example of the configuration of a ventilation system installed in the bunker hydraulic / electrical room within the building according to this embodiment. [Figure 3] This figure shows an example of the configuration of a ventilation system installed in a conventional bunker hydraulic / electrical room within a building. [Modes for carrying out the invention]

[0010] A ventilation system according to a preferred embodiment of this disclosure will be described in detail below with reference to the attached drawings. Note that the drawings referenced in the following description include schematic drawings, and there may be differences in the dimensional relationships and proportions between the drawings.

[0011] [Example of a schematic configuration of Biomass Power Generation System 1] Figure 1 shows an example of the schematic configuration of the biomass power generation system 1 according to this embodiment. The biomass power generation system 1 comprises a silo 10, a building 20, and a bunker 30. Although not shown in Figure 1, the biomass power generation system 1 also includes equipment such as a boiler, turbine, and generator. As fuel, for example, biomass pellets or a mixture of coal and biomass pellets can be used.

[0012] Silo 10 stores, for example, biomass pellets. Biomass pellets are a type of biomass fuel and are formed, for example, into a cylindrical shape. Renewable, biologically derived organic resources are used as materials for biomass pellets. Specifically, materials for biomass pellets include thinned wood, waste wood, driftwood, grass, agricultural and livestock waste, and sewage sludge. Biomass fuel is considered carbon neutral because it does not emit carbon dioxide, which is a greenhouse gas, as the organisms used as raw materials absorb carbon dioxide during their growth process. Figure 1 shows one silo 10 where biomass pellets are stored, but a coal storage area for coal may also be provided.

[0013] A belt conveyor 12 is installed between the silo 10 and the building 20. The belt conveyor 12 transports fuel such as biomass pellets from the silo 10 to the building 20. The belt conveyor 12 may also be used to transport coal. In this case, the biomass pellets and coal are transported separately. Alternatively, a separate belt conveyor may be installed for transporting coal. Note that the number of belt conveyors 12 and the transport devices 40 described later are not limited to the number shown in Figure 1.

[0014] Building 20 is equipped with a conveying device 40 for transporting fuel such as biomass pellets. The conveying device 40 comprises a first belt conveyor 41, a second belt conveyor 42 installed below it, and a chute section 43. The chute section 43 is a pipe extending vertically and is installed between the first belt conveyor 41 and the second belt conveyor 42. The first belt conveyor 41 transports fuel such as biomass pellets that it has taken over from belt conveyor 12. The fuel transported by the first belt conveyor 41 falls to the second belt conveyor 42 via the chute section 43. The second belt conveyor 42 transports the fuel such as biomass pellets that has fallen from the first belt conveyor 41 to the bunker 30.

[0015] Inside building 20 is a bunker hydraulic and electrical room 200 with an openable and closable door 210. The bunker hydraulic and electrical room 200 is located near the transport route consisting of the first belt conveyor 41 and the second belt conveyor 42, etc., inside building 20. Inside the bunker hydraulic and electrical room 200 are a hydraulic unit 220 for driving the transport device 40 (hydraulic motor), and a control panel for controlling the operation of the hydraulic unit 220. The hydraulic unit 220 includes, for example, a hydraulic pump for operating the hydraulic motor, an oil tank, an electric motor, etc. Furthermore, the bunker hydraulic and electrical room 200 is equipped with a ventilation system 50 to prevent dust generated from biomass pellets and coal transported by the transport device 40 from entering the bunker hydraulic and electrical room 200. Details of the ventilation system 50 will be described later.

[0016] The bunker 30 is inside the building 20 and is installed below the second belt conveyor 42. In this embodiment, three bunkers 30 are provided, but the number of bunkers 30 is not limited to that shown in FIG. 1. Also, the arrangement of the bunkers 30 is not limited to that shown in FIG. 1, and for example, they may be installed outside the building 20. The bunker 30 stores biomass pellets and coal scraped off from the second belt conveyor 42. The fuel such as biomass pellets stored in the bunker 30 is conveyed to a boiler (not shown). The boiler generates high-temperature and high-pressure steam by heating water with heat obtained by burning, for example, biomass pellets and coal. The steam generated in the boiler is converted into rotational energy by a turbine. The generator generates electricity based on the rotational energy generated by the turbine.

[0017] [Configuration example of ventilation system 50] FIG. 2 is a schematic diagram showing an example of the configuration of a ventilation system 50 installed in the bunker hydraulic and electrical chamber 200 according to this embodiment. The ventilation system 50 includes an intake port 500, an exhaust port 510, an oil cooler 520, a ventilation device 530, a control device 540, and an operation unit 542.

[0018] The intake port 500 has, for example, an intake hood and is installed on the roof of the building 20. A filter 560 is installed between the intake port 500 and the ventilation device 530, on the suction side (upstream side) of the intake of the ventilation device 530. The filter 560 removes dust, dirt, garbage, etc., such as biomass pellets contained in the outside air, and prevents small animals, insects, etc. from entering the bunker hydraulic and electrical chamber 200. The intake port 500 is connected to the upper end side of a first pipe 550 that extends between the roof of the building 20 and the ceiling space of the bunker hydraulic and electrical chamber 200. The lower end side of the first pipe 550 communicates with the inside of the bunker hydraulic and electrical chamber 200 through the ceiling of the bunker hydraulic and electrical chamber 200. Thereby, the outdoor air sucked in from the intake port 500 is supplied into the bunker hydraulic and electrical chamber 200 through the first pipe 550.

[0019] The exhaust port 510 has, for example, an exhaust port hood and is installed on the rooftop of the building 20 at a predetermined distance from the intake port 500. The exhaust port 510 is connected to the upper end side of the second pipe 552 that extends between the rooftop of the building 20 and the ceiling of the bunker hydraulic and electrical room 200. The lower end side of the second pipe 552 communicates with the inside of the bunker hydraulic and electrical room 200 through the ceiling of the bunker hydraulic and electrical room 200. Thereby, the air in the bunker hydraulic and electrical room 200 is discharged to the outside from the exhaust port 510 through the second pipe 552.

[0020] The ventilation device 530 is, for example, located directly below the first pipe 550 and is attached to the ceiling of the bunker hydraulic and electrical room 200. The ventilation device 530 is provided with a blowout port for blowing out the sucked air, and the blowout port is exposed to the interior of the room. The ventilation device 530 has, for example, a motor and an impeller. The ventilation device 530 blows (sends out) the air sucked from the intake port 500 into the bunker hydraulic and electrical room 200 by rotating the impeller by driving the motor.

[0021] The control device 540 is connected to the ventilation device 530 through wiring such as a cable. The control device 540 has, for example, a processor such as a CPU (Central Processing Unit). The control device 540 rotates the impeller in a predetermined direction by supplying a drive signal to the motor of the ventilation device 530. The operation unit 542 can be constituted by, for example, buttons, switches, etc. The operation unit 542 receives instructions such as on / off of the drive of the ventilation device 530 by an operator and supplies an operation signal based on the received instruction to the control device 540. Note that the control device 540 and the operation unit 542 may be provided outside the bunker hydraulic and electrical room 200 or incorporated in a control panel.

[0022] The oil cooler 520 is connected to the oil tank of the hydraulic unit 220 via pipes (not shown) and cools the oil with, for example, air. The oil cooler 520 is located on the roof of the building 20, between the intake port 500 and the exhaust port 510. The exhaust port 510 is located downstream of the outlet 522 from which the oil cooler 520 discharges air. In other words, the outlet 522 of the oil cooler 520 faces away from the intake port 500 of the ventilation system 50 and is located at a distance from the intake port 500. This prevents the warm air discharged from the outlet 522 of the oil cooler 520 from flowing into the bunker hydraulic / electrical room 200 through the intake port 500.

[0023] [Example of operation of ventilation system 50] Next, an example of the operation of the ventilation system 50 according to this embodiment will be described with reference to Figures 1 and 2. When the control device 540 receives an instruction from the operation unit 542 to operate the ventilation device 530, it supplies a drive signal to the motor of the ventilation device 530. The motor of the ventilation device 530 rotates the impeller by being driven based on the drive signal supplied from the control device 540. The ventilation device 530 draws in outdoor air from the intake port 500 by the rotation of the impeller and blows the drawn-in air into the bunker hydraulic / electrical room 200 via the first piping 550. The inside of the bunker hydraulic / electrical room 200 becomes positively pressurized by the air blown into the bunker hydraulic / electrical room 200 by the ventilation device 530. The ventilation device 530 may be set to operate continuously.

[0024] Within the bunker hydraulic / electrical room 200, an airflow in the direction of the arrow D1 shown in the diagram is formed by the air supplied into the bunker hydraulic / electrical room 200 by the ventilation device 530, moving from the intake port 500 to the exhaust port 510. Specifically, outside air drawn in from the intake port 500 flows into the bunker hydraulic / electrical room 200 via the first pipe 550. The air that flows into the bunker hydraulic / electrical room 200 circulates within the bunker hydraulic / electrical room 200 and is discharged from the exhaust port 510 via the second pipe 552. This suppresses the temperature rise inside the bunker hydraulic / electrical room 200.

[0025] The oil cooler 520 cools the oil stored in the oil tank. The air exhausted from the outlet 522 of the oil cooler 520 flows towards the exhaust port 510, which is located downstream in the direction of air exhaust. In contrast, the air inside the bunker hydraulic / electrical room 200 is discharged to the outside from the exhaust port 510. Therefore, the air discharged from the oil cooler 520 does not flow into the exhaust port 510.

[0026] [Effects of this embodiment] The effects of this embodiment will be explained based on a comparison with a conventional ventilation system 60. Figure 3 is a schematic diagram showing an example of the configuration of a conventional ventilation system 60 installed in a bunker hydraulic / electrical room 200. Detailed explanations of components that are substantially common with the ventilation system 50 according to this embodiment will be omitted or simplified.

[0027] The conventional ventilation system 60 comprises an intake port 600, an exhaust port 610, an oil cooler 620, a ventilation device 630, and a control device 640. The ventilation device 630 is located directly below the second piping 652 and is mounted on the ceiling of the bunker hydraulic / electrical room 200. In other words, the ventilation device 630 is mounted near the exhaust port 610. A filter 660 is attached to the exhaust port 610 side of the ventilation device 630. The ventilation device 630, when driven, draws in air from inside the bunker hydraulic / electrical room 200 and discharges it from the exhaust port 610, thereby creating negative pressure inside the bunker hydraulic / electrical room 200. Consequently, outside air flows into the bunker hydraulic / electrical room 200 from the intake port 600. Inside the bunker hydraulic / electrical room 200, an airflow is formed in the direction of the arrow D2 in the diagram, from the intake port 500 to the exhaust port 510. This makes it possible to suppress the temperature rise inside the bunker hydraulic and electrical room 200.

[0028] However, in the case of the conventional ventilation system 60, air from inside the building 20 also flows in through the gap in the door 210 of the bunker hydraulic / electrical room 200. As a result, dust scattered outside the bunker hydraulic / electrical room 200 could also enter the bunker hydraulic / electrical room 200 through the gap in the door 210. This could cause dust to adhere to and accumulate on relays and other components inside the control panel installed in the bunker hydraulic / electrical room 200, leading to malfunctions and tripping of the hydraulic system of the belt conveyor. In addition, because the filter 660 is located downstream (outside) of the airflow of the ventilation device 630, dust could adhere to and accumulate on the ventilation device 630, causing it to trip.

[0029] Furthermore, the oil cooler 620 is located on the roof of building 20, between the intake port 600 and the exhaust port 610. The intake port 600 is located downstream of the outlet 622 of the oil cooler 620. In other words, the outlet 622 of the oil cooler 620 faces the intake port 600 of the ventilation system 60 and is located near the intake port 600. In this case, the warm air discharged from the oil cooler 620 is drawn in through the intake port 600, and the drawn-in air flows into the bunker hydraulic / electrical room 200. As a result, the temperature inside the bunker hydraulic / electrical room 200 rises, and the oil stored in the oil tank is heated by the warm air inside the room, causing it to exceed the appropriate temperature.

[0030] In contrast, according to this embodiment, the rotation direction of the ventilation device 530 is reversed to blow air into the bunker hydraulic / electrical room 200, thereby creating positive pressure inside the bunker hydraulic / electrical room 200. This prevents outdoor dust and other particles from entering the bunker hydraulic / electrical room 200 through the intake port 500, and prevents dust and other particles from inside the building 20 from entering the bunker hydraulic / electrical room 200 through gaps in the door 210, etc. Furthermore, within the bunker hydraulic / electrical room 200, a flow direction D1 in the direction of the arrow in Figure 2, from the intake port 500 to the exhaust port 510, can be formed with respect to the air drawn in from outside. This suppresses the temperature rise inside the bunker hydraulic / electrical room 200. As a result, the temperature rise of the oil tank itself can also be suppressed, and the oil in the oil tank can be maintained at an appropriate temperature.

[0031] Furthermore, according to this embodiment, the outlet 522 from which the air of the oil cooler 520 is exhausted is located on the opposite side from the intake port 500 that draws in outside air. This prevents the air discharged from the outlet 522 of the oil cooler 520 from being drawn in through the intake port 500. Therefore, it is possible to prevent the warm air discharged from the outlet 522 of the oil cooler 520 from flowing into the bunker hydraulic / electrical room 200, thereby suppressing the temperature rise inside the bunker hydraulic / electrical room 200 and maintaining the oil in the oil tank at an appropriate temperature. As a result, since the bunker hydraulic / electrical room 200 can be maintained at an appropriate temperature, it is possible to suppress the generation of warning information indicating that electrical equipment such as control panels have become overheated, even in the summer.

[0032] Although preferred embodiments of this disclosure have been described in detail above with reference to the attached drawings, the technical scope of this disclosure is not limited to these examples. Furthermore, various modifications and improvements naturally fall within the technical scope of this disclosure, within the scope of the technical ideas described in the claims for those skilled in the art. [Explanation of Symbols]

[0033] 1. Biomass power generation system 20 buildings 40 Conveying device 41. First Belt Conveyor (Conveying Device) 42. Second belt conveyor (conveying device) 43. Chute section (conveyor device) 50 Ventilation System 200 Bunker Hydraulic and Electrical Room (Room) 500 Air intake 510 Exhaust port 520 Oil Cooler 530 Ventilation system 550 First Piping 552 Second Piping 560 filters

Claims

1. A ventilation system for adjusting the temperature of a room located inside a building equipped with a conveying device for transporting fuel containing biomass pellets, An air intake is provided on the roof of the aforementioned building and communicates with the interior of the building via a first pipe, An exhaust port is provided on the roof of the aforementioned building and communicates with the interior of the building via a second pipe, The room is equipped with a ventilation device that blows air into the room, The ventilation device creates a positive pressure in the room by blowing air drawn in from the intake port into the room. Ventilation system.

2. The building is provided with an oil cooler located on the rooftop between the air intake and exhaust ports, which cools the oil in an oil tank located inside the room. The exhaust port is located downstream of the outlet for the air discharged from the oil cooler. The ventilation system according to claim 1.

3. A filter is provided between the air intake port and the ventilation device to remove dust contained in the air drawn in from the air intake port by the ventilation device. The ventilation system according to claim 1.

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