JPS6330243B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention makes it possible to prevent waste from freezing and adhering to the inner walls of transport pipes, which is expected when a pneumatic transport system for municipal waste is adopted in a cold region. This invention relates to a pneumatic transportation device for municipal waste.

[Conventional technology] In the conventional pneumatic transportation system for municipal waste,
As shown in Figure 1, the outline of a municipal waste pneumatic transport system that has transport pipes installed in a public ditch is as shown in Figure 1. A line is connected to the underground transport pipe 3 via a discharge valve 4, and connects each underground transport pipe 3 to a common trench transport pipe 7 arranged in a common trench 5 which has ventilation openings 6 at several locations. Connected via a switching valve 8 to the above-mentioned common trench transport pipe 7
is led to collection station 9. The collection station 9 consists of a separation device that separates and discharges municipal waste that has been transported with air, and an exhaust device that provides the air volume and pressure necessary to transport the municipal waste, and is used as a primary separator. a cyclone 10, a storage and discharge device 11, a bag filter 12 as a dust collector, a deodorizing device 13, a collecting air source (blower) 15 having an air pipe 14 and switching valves 16, 17, and an atmospheric suction valve 18. It is configured to include an air suction silencer 19, a discharge side air pipe 20 of an air source 15, and a discharge silencer 21, and a bag filter 12 and a storage/discharge device 11 are connected through a dust screw conveyor 22.

Therefore, urban waste collection operations are carried out as follows. That is, after the garbage inputted and stored in the garbage storage device 1 passes through the discharge valve 4 provided for discharging the garbage into the transportation pipe and falls into the air flow inside the underground transportation pipe 3, The waste flows together with the air through the line switching valve 8 and the common ditch transport pipe 7 and is guided to the cyclone 10 in the collection station 9, where it is separated from the air and collected and stored in the storage and discharge device 11. On the other hand, the air separated from dust by the SAINRON 10 is further separated into fine dust by a bag filter 12. The air from which the fine dust has been separated is supplied to the air source 15.
The air sucked by the drive of the air pipe 14 passes through the deodorizing device 13 and the air source 15, and is then discharged into the atmosphere via the air pipe 20 and the discharge silencer 21. Also, when starting the air source 15 and switching the transportation line switching valve 8, the air intake silencer 1 is activated.
9. Atmospheric air is taken in through an air intake valve 18.

[Problems to be Solved by the Invention] A conventional pneumatic transportation device for municipal waste having the above-mentioned configuration and operation can be used at temperatures ranging from, for example, -10°C to -40°C.
If pneumatic transport of waste is carried out in a cold region where the temperature drops to as low as 30 degrees Fahrenheit, there is a problem that the waste may freeze inside the transport pipes due to the drop in outside air temperature and the blowing of cold air, especially during the severe winter season. becomes.

That is, when waste is transported with the inner wall temperature of the transport pipe cooled to below freezing point, the waste containing moisture comes into contact with the cooled inner wall of the pipe and freezes and adheres thereto. This adhered dust forms an uneven surface on the inner wall surface of the pipe, which increases the coefficient of frictional resistance of the pipe due to air flow, resulting in an increase in transportation pressure and power consumption.

Temperature changes in transport pipes vary depending on the installation method of the transport pipes. There are two installation methods: one is to corrode the outside surface of the transport pipe and bury it directly underground, and the other is to install it in a common trench along with other utility pipes.

Temperature changes in pipes in the case of underground pipes In the case of underground pipes, they are generally buried at a certain depth (2 to 3 m) above the freezing depth, and are not directly affected by the outside temperature when the transportation system is stopped. Underground temperature (+℃ side) during system stop (from the end of the previous day's operation to the start of operation the next day)
Due to the influence of water, the temperature is almost the same as underground. Next, when the collection and transportation operation is started, the ventilation of outside air (cold air) gradually cools down from the intake valve 2 side, and the temperature of the transportation pipe toward the collection station 9 is between t ₁ °C and t ₂ °C (t ₁ < t ₂ ). t ₁ ℃ and t ₂ ℃ are the initial temperature of the pipe before the start of transportation (≒ underground temperature), the length of the pipe of the equipment, the position of the inlet port, the transportation time, etc., and may be negative or positive. It's also possible.

Temperature changes in equipment transport pipes in the common ditch As people come in and out of the common ditch for maintenance, natural ventilation is always provided through ventilation holes 6 to prevent oxygen deficiency. Therefore, the transport pipe 7 installed here is in a state similar to being exposed to the outside air, and is directly affected by the outside air temperature regardless of whether the garbage collection operation is in progress or stopped. Even if a heat insulating material is installed on the outer surface of the transport pipe 7 to prevent the influence of outside air in the common ditch, cooling of the transport pipe will only proceed due to ventilation of outside air (cold air) into the transport pipe from the intake port during collection and transport operation. The inflow of heat from the outside is blocked, and the system is cooled by ventilation each time the collection and transportation operation is performed. In addition, if there is an above-ground transport pipe outside the collection station building, the conditions are even more severe than those in a public ditch, and the pipe is directly affected by the outside air temperature and is therefore cooled.

As mentioned above, for underground pipes, the temperature inside the pipe is determined by equipment conditions (pipe length, etc.), transportation operation time, etc., and there is heat input from underground, so it is generally However, as mentioned above, there is no exchange of underground heat for transport pipes installed in public ditches and above-ground transport pipes outside collection station buildings, so if the outside temperature falls below freezing, the transport pipes will cool down to below freezing. There is also a problem in that the waste is cooled and the waste in the transport pipes freezes and adheres, increasing the transport pressure and power consumption.

The present invention solves the problem of waste freezing and adhering to the transport pipes, which can occur when the above-mentioned conventional pneumatic transport equipment for municipal waste is installed in cold areas, especially in the case of underground pipes. This was done to stabilize the system by preventing debris from freezing and adhering to the inner wall of the transport pipe in the common ditch, which has poor conditions compared to the previous one. It is designed to heat the transport pipe by blowing into the cover duct placed in the pipe.

[Means for Solving the Problems] The present invention collects and transports the garbage input and stored in a garbage storage facility to a collection station along with an air flow in a transport pipe, and uses the air separated from the garbage to collect air in the collection station. In a pneumatic transport system for municipal waste that is designed to discharge into the atmosphere from the discharge side of a source, the outside of a transport pipe installed in a common ditch is covered with a cover duct, and the space between the inner surface of the cover duct and the outer surface of the transport pipe is An air pipe for blowing exhaust gas from the collecting air source is arranged between the discharge side of the air source and the space, so that the transport pipe can be heated by the exhaust heat of the air source. This is a characteristic feature.

[Function] Because the inside of the common groove communicates with the outside air, the temperature drops to the outside air temperature, but by guiding the exhaust air from the air source into the space between the cover duct and the transport pipe, the air is transported by the exhaust heat from the air source. The tube is heated from the outside. This increases the temperature inside the transport pipe and prevents dirt from freezing and adhering to the wall of the pipe.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 shows an example of the present invention, in which a pneumatic transport system for municipal waste has the same configuration as the conventional system shown in FIG. all around,
It is covered with a transport pipe cover duct 23 so that a space of a required width is formed between the inner surface of the transport pipe cover duct 23 and the outer surface of the transport pipes 7, 7a, and the transport pipe cover duct 23 is An exhaust port 24 is appropriately provided at a position corresponding to the ventilation hole 6 of the common groove 5, and an air pipe 20 on the discharge side of the collecting air source 15 is provided.
A heating air pipe 25 is connected to the middle of the transport pipe 23, and the air pipe 25 is branched into a plurality of parts. In addition to being connected via the regulating valve 26, it is also connected via a flow rate regulating valve 26 into the cover duct 23 outside the transport pipe 7a, and the collection air source 1
5 can be blown into the air between the inside of the transport pipe cover duct 23 and the outer surface of the transport pipes 7, 7a. The above-mentioned above-mentioned collection station building outdoor ground transport pipe 7a is connected to the collection station 9 by the cyclone 10 after the underground transport pipe 7 exits the common ditch 5 and exits above the ground.
It is a transportation pipe until it connects to. Note that the connection point of the branched air pipe to the transport pipe cover duct 23 is set at an intermediate position between the exhaust ports 24 and 24 to prevent the blown exhaust gas from being immediately exhausted to the outside of the cover duct 23. In addition, the above-mentioned communal ditch transport pipe 7 and the collection station building outdoor ground transport pipe 7a
The relationship between the cover duct 23 and the transport pipe cover duct 23 is as shown in FIGS. 3 and 4, and exhaust gas is blown into the space formed between the cover duct 23 and the transport pipes 7 and 7a. And cover duct 2
3 itself has a circular cross section, and in FIG. 3 it has fins so that it can be easily supported in the longitudinal direction, and in FIG. 4 it is supported by other means.

Further, the heating air pipe 25 and the air pipe 20 are provided with switching valves 27 and 28, respectively, for switching whether to guide the exhaust gas from the collecting air source 15 to the atmosphere side or to the common ditch 5 side. Transport pipe temperature detectors 29 are installed at several locations on the pipe 7 and the ground transport pipe 7a outside the collection station building, and outside air thermometers 30 are installed at appropriate positions. , the temperature detector 29 and thermometer 30 are connected to enable temperature monitoring. Further, a pipe for bypassing the deodorizing device 13 and the atmospheric absorption section is arranged in the air pipe 14 in the collection station 9, with a bypass valve 32 in the middle, so that the deodorizing device 1
Maintenance switching valve 33 is installed on the inlet and outlet sides of 3.
34 will be provided.

In the above embodiment, in addition to being able to carry out general municipal waste collection and transport operation, the following transport pipes 7, 7a
A heating operation can also be performed.

There are two ways of heating the transport pipes 7 and 7a: when the heating operation is performed while the collection and transport operation is stopped, and when it is performed during the collection and transport operation.

() When carried out while garbage collection and transportation is stopped: Open the air intake valve 18, close the deodorizing equipment maintenance switching valve 34 and bypass valve 32,
The switching valves 16 and 17 belonging to the plurality of air sources 15 or one air source 15 to be used are opened, and the switching valve 2 is opened.
7 is opened, 28 is closed, and the required number of air sources 15 are driven. At this time, the exhaust gas temperature on the discharge side of the air source 15 can be adjusted by adjusting the magnitude of the load resistance on the suction side, that is, the opening degree of the atmospheric air intake valve 18, assuming that the temperature on the suction side (atmosphere) is constant.

The air sucked through the air intake silencer 19 is heated in an adiabatic compression stroke by the air source 15, and is led to the heating air pipe 23 through the discharge silencer 21, so as to uniformly heat the inside of the common groove. It is branched into a plurality of pipes each having a flow rate regulating valve 26 with a preset opening degree, and is blown into the transport pipe cover duct 23 from several places, thereby heating the transport pipes 7, 7a from several places at the same time. Although not shown, since the exhaust gas heated by the air source 15 passes therethrough, the piping equipment is heat-insulated to prevent heat dissipation. Since the warm air blown into the transport pipe cover duct 23 as described above flows through a narrow space, the flow velocity becomes faster and heat transfer increases, and the transport pipes 7, 7
can be effectively heated from the outside. As a result, the temperature inside the pipe increases, and the debris that has frozen and adhered to the wall of the pipe melts and accumulates at the bottom of the pipe.
Next, the garbage in the transport pipes 7, 7a is collected and transported together with air to the collection station 6 using a collection operation method.

In the above operation, when heating the outside of the transportation pipe 7 in the common ditch and the surface transportation pipe 7a outside the collection station building while the collection transportation operation is stopped, the temperature is detected by the thermometer 30 before the scheduled time when the collection operation is implemented. When the outside air temperature decreases, the transport pipes 7 and 7a
If the temperature drops below the freezing point (-t°C), the above-mentioned heating operation is performed in conjunction with the transport pipe temperature detector 29, and the heating operation is performed by heating to the set temperature + _t2 °C (optional). stop. That is, the temperature of the transport pipes 7 and 7a is changed to (-t ₁ °C to +t ₂ °C) (-t ₁
℃, +t ₂ ℃ can be set arbitrarily). Or
The temperature of the outside air and the transport pipe temperature at a certain time are detected by the thermometer 30 and the transport pipe temperature detector 29, respectively, and the heating operation necessary to heat the transport pipe 7 in the common trench to an arbitrary temperature +t°C is performed. The time T is calculated by the control device 31 (built-in microcomputer, etc.),
The heating operation is performed when the following condition is satisfied: (collection operation fixed time - temperature detection time)≒required heating time T. The above-mentioned heating time T is calculated by giving the outside air temperature, the measured initial temperature of the transport pipes 7 and 7a, and the system usage conditions such as the transport pipe length, material, number of drive blocks (total power), etc. be done.

() When carrying out heating operation in parallel with collection and transportation operation The operation of collecting and transporting the garbage in waste storage facility 1 itself is the same as the conventional method. The difference is in the opening and closing operations of the switching valves 27 and 28. When the heating operation is also used, the switching valve 2 is changed so that the required amount of exhaust air from the air source 15 flows into the heating air pipe.
7 and 28 to appropriate opening degrees. As a result, when garbage input and stored in a certain garbage storage facility 1 according to a predetermined program is transported through the underground transportation pipe 3, the transportation pipe in the common ditch 7 and the surface transportation pipe outside the collection station building are transported. 7
a is heated, even if the waste passing through the transport pipes 7, 7a contains moisture, it is collected and transported to the collection station 9 without freezing and adhering to the inner walls of the transport pipes 7, 7a. .

In this case, when the collection operation and heating operation are used together, if the amount of garbage transported from the garbage storage facility 1 increases and the power is required to reach the original rated value of the pneumatic transportation power, the There is a possibility of overloading only the discharge pressure required for warm operation. In order to avoid this, two methods are available: the capacity of the air source 15 is planned in advance as the power (rated) for collection and transportation operation + the power required for heating operation, and the other is to , an air source (blower) 3 having the discharge pressure necessary for heating operation
5 and switching valves 36 and 37 are installed, and a pipe 38 is provided to bypass these, and a switching valve 39 is provided in the middle of the pipe, and the exhaust air from the collection air source 15 is pressurized by a separate air source to be connected to the transport pipe 7. , 7a and the transport pipe cover duct 23.

According to the example shown in FIG. 5 above, when the collection operation and heating operation are used together, it is effective because the air source 35 can cover the discharge pressure required for the heating operation, and also when the collection operation is stopped in () above. In the case of the heating operation during the heating operation, the above operation () is also possible by using the bypass pipe 38.

In addition, in the case of the combination of collection operation and heating operation described in () above, when the transport pipes 7 and 7a reach the set lower limit temperature due to a drop in outside air temperature during the garbage collection operation, the transport pipe temperature The heating operation is operated in conjunction with the detector 27, and is stopped at the upper limit set temperature. Although the heating operation has been described as automatic operation in conjunction with a temperature detector, it can also be operated manually.

It should be noted that the present invention is not limited to the above-described embodiments; for example, the shape of the transport pipe cover duct 23 is not limited to the circular shape shown in FIGS. 3 and 4, but may be rectangular or the like. Although the transport pipes to be heated are shown as the transport pipe in the communal ditch 7 and the above-ground transport pipe 7a outside the collection station building, the underground transport pipe 3 may be heated if necessary. Of course, various other changes may be made without departing from the spirit of the present invention.

[Effects of the Invention] As described above, according to the present invention, a cover duct is provided on the outside of the transport pipe, and the exhaust air from the collecting air source is sent into the cover duct to heat the transport pipe. Since it is designed to prevent dirt from freezing and adhering to the inner wall of the road, the following excellent effects can be achieved.

(i) Since it is possible to prevent waste from freezing and adhering inside the transport tube furnace, reliability is improved when installed in cold regions.

(ii) Transport pressure does not increase due to the prevention of freezing and adhesion of waste in the pipes, so transport power does not increase.

(iii) Since exhaust heat from the air source can be used effectively, power consumption can be reduced and energy conservation can be achieved.

(iv) Since a cover duct is placed outside the transport pipe to blow the exhaust air from the air source into a narrow space, the flow rate of the warm air that is blown into the pipe is high, and heat transfer is large. can be heated.

(v) System construction costs can be reduced by reusing transportation equipment and heating equipment.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet showing an overview of a conventional pneumatic transportation device for municipal waste, Fig. 2 is a flow sheet showing an example of the device of the present invention, and Fig. 3 and 4 are diagrams showing the cover duct in the device of the present invention. FIG. 5 is a partial perspective view showing the relationship between transport pipes, and a schematic diagram showing another example of the apparatus of the present invention. 1... Garbage storage facility, 3... Underground transport pipe,
5...Community ditch, 7...Community ditch transport pipe, 7a...
Collection station building outdoor ground transport pipe, 9... Collection station, 15... Collection air source, 23...
Transport pipe cover duct, 25... Heating air pipe, 2
6...Flow rate adjustment valve, 29...Transport pipe temperature detector.

Claims (1)

[Claims] 1 The garbage that has been put into the garbage storage facility is collected and transported to the collection station along with the air flow inside the transport pipe, and the air separated from the garbage is released into the atmosphere from the discharge side of the collection air source in the collection station. In a pneumatic transport system for municipal waste, a cover duct is provided on the outside of a transport pipe installed in a common ditch, and air is used to blow exhaust air from the collection air source into the space between the inner surface of the cover duct and the outer surface of the transport pipe. A pneumatic transport device for municipal waste, characterized in that a pipe is arranged between the discharge side of the air source and the space, and the transport pipe can be heated by exhaust heat from the air source.