JPS6411524B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is designed to prevent waste from freezing and adhering to the inner wall of the transport pipe when a vacuum pneumatic transport system for municipal waste is installed in a cold region. The present invention relates to a device for preventing the freezing and adhesion of waste in transport pipes.

[Prior Art] As shown in Figure 1, a conventional vacuum pneumatic transport system for municipal waste has a structure in which waste storage facilities (garbage posts) 1a, 1 are installed at several key points on street corners.
Install b, 1c, 1d, 1e, 1f, 1g,
A supply valve 3 is connected to each transport pipe 2a buried underground.
a, 3b, 3c, 3d, 3e, 3f, 3g, and the transport pipe 2a is located in the common ditch 4 or buried underground and connected to the cyclone which is the primary separator in the collection station 6. Shutoff valves 5a, 5b, 5 are connected to the transport pipe 2b connected to 7.
The collection station 6 is connected to the cyclone 7, the bag filter 8, the deodorizing device 9, and the air source (blower) 10 in order through the air pipe 1.
1 and is connected to and provided with an air source 10
A silencer 13 is connected to the upstream side of the air source 10 via an air intake valve 12, and an air pipe 1 is connected to the downstream side of the air source 10.
4 is configured to be opened to the atmosphere via a silencer 15. In addition, the air source 10 is 4 as an example.
Although several units are shown, one is a spare, and a system is also adopted in which the deodorizing device 9 is installed after the air source 10.

During operation, once the waste is temporarily stored in the waste storage facility, the air intake valve 12 is opened and the air source 1 is turned on.
0, open the supply valve 3a of a predetermined waste storage facility (for example, 1a) according to a predetermined program, and close the above-mentioned atmospheric intake valve 12.
The air source 10 serves as a negative pressure source, and the garbage stored in the garbage storage facility is sucked together with the atmosphere through the supply valve 3a, and sent to the cyclone 7 of the collection station 6 through the transport pipes 2a and 2b, where it is collected. Separated from air. The air containing dust is led to a bag filter 8 to separate the dust, and then deodorized by a deodorizing device 9, passed through an air pipe 11, is pressurized by an air source 10, and is discharged to the atmosphere via a silencer 15. On the other hand, the garbage separated by the cyclone 7 is transferred from a collection drum or the like to a transport vehicle.

When the garbage stored in one garbage storage facility is collected in this manner, the garbage storage facility is automatically switched to other garbage storage facilities for collection and transportation in the same way.

[Problems to be Solved by the Invention] As mentioned above, the conventional vacuum pneumatic transportation device for municipal waste is capable of vacuum collecting the garbage that has been input and stored, but when the temperature is -10℃ ~−40
If garbage collection and transportation is carried out in an area that experiences severe cold, with temperatures dropping to around 30°F, the following problems may occur. In other words, in the case of severe cold, the transport pipes that connect the waste storage facility and the collection station are buried at a certain depth and are kept at a higher temperature than the atmosphere, but when the air is sucked into the transport pipes during the vacuum transport of waste, , -10°C to -40°C passes through the transport pipe, thereby cooling the inner wall of the pipe. Therefore, (a) the inner surface temperature of the transport pipe decreases.

(b) When transporting garbage containing sewage (moisture),
When this dust comes into contact with the cooled inner wall of the pipe, it immediately freezes and adheres to the inner wall of the pipe.

(c) If the operation time is long, especially the portion of the transport pipe near the collection station will be exposed to cold air for a long time, and the phenomenon of dust adhesion will become significant due to cooling.

(d) When dirt adheres to the inner wall of a transport pipe, an uneven surface is created on the inner wall of the pipe, and this is formed throughout the pipe, which increases the frictional resistance of the pipe due to the air flow, and the air Not only does the power consumption of the blower increase, resulting in increased energy consumption, but there is a risk that the blower may become inoperable.

(e) If a part of the transport pipe is placed in a common ditch, the phenomenon of freezing and adhesion becomes even more severe as there is no exchange of geothermal heat compared to when it is buried underground. This is based on the fact that the inside of the common ditch is constantly ventilated and the temperature is almost at atmospheric temperature, so both the inside and outside of the transport pipe are exposed to cold air.

(f) In the case of underground pipes, garbage that freezes and adheres to the inner wall surface of the pipe during transportation is melted by underground heat and accumulates at the bottom of the pipe after operation is completed, but in the case of underground pipes, it remains frozen and adheres to the pipe. There is. Therefore, during the next operation, the garbage accumulated at the bottom of the pipe will be transported at the same time, increasing transport resistance. Moreover, since the operation starts with the inside of the common ditch already frozen and adhered to it from the previous operation, the resistance becomes even greater, and the amount of frozen debris increases, leading to the worst situation of blockage in the pipe and system operation stoppage. It turns out.

The purpose of the present invention is to eliminate the above-mentioned problems that may occur when a pneumatic transport system for municipal waste is installed in a cold area. This increases the air temperature within the transport pipe to prevent freezing and adhesion.

[Means for Solving the Problems] The present invention provides an apparatus for pneumatically transporting municipal waste input and stored in a waste storage facility to a collection station through a transport pipe, and a collection station installed in the apparatus. A blow line is provided between the air pipe on the discharge side of the air source and the transport pipe to guide the exhaust air from the air source, so that all or part of the exhaust air from the air source is blown into the transport pipe. It is characterized by:

[Function] After the collection and transportation of garbage is completed, the collection air source is activated and the exhaust air is blown into the transportation pipe through the suction line, and after heating the inside of the transportation pipe, it flows into the pipe to the collection station. Collect and transport the garbage that adheres to the surface.

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

FIG. 2 shows an outline of the device of the present invention, which has the same configuration as the conventional system shown in FIG.
A new pipe is installed between the air pipe 14 on the discharge side of the air source 10 and the end of the transport pipe 2b (on the waste storage facility 1d side).
The warm air discharged from the air source 10 is connected via a blow line 18 having a blow valve 16 and a pressure gauge 17 in the middle, and a discharge valve 19 is provided after the line 18 connection part of the air pipe 14. A part or all of the transport pipe 2a is introduced into the transport pipe 2a,
Furthermore, a silencer 21 is connected midway through the air pipe 11 via a bypass discharge valve 20, and a switching valve 22 is provided at a midway position of the air pipe 11 where the discharge valve 20 and the atmospheric air suction valve 12 are connected. In addition, the same symbols as in FIG. 1 indicate the same equipment.

The operation of preventing dust from freezing and adhering to the inner wall of the pipe using the apparatus of the present invention having the above-mentioned structure will now be described.
Note that the present invention is carried out after the completion of system operation and before the start of the next operation. When the collection operation by the program is completed, all equipment is stopped, and in this stopped state, all local The operating valves are closed.

() Cleaning operation of the transport pipe inside the common ditch If there is a common ditch 4 and the transport pipe is installed inside it, there is a problem that the inside of the common ditch 4 is at atmospheric temperature and the inside and outside of the pipe is exposed to cold air. Due to the conditions, drive as follows.

The switching valve 22 is closed, the atmospheric suction valve (bypass suction valve) 12 is opened, the discharge valve 19 is closed, the blow-in valve 16 is opened, all of the cutoff valves 5a to 5d are closed, and the air source 10 is driven. As a result, the air is sucked in through the silencer 13 and the atmospheric intake valve 12, and is pressurized by the air source 10, and becomes air whose heat shield temperature has been increased.
is forced into the distal end of the The air sent into the transport pipe 2b passes through the transport pipe 2b, a cyclone 7, a back filter 8, a deodorizing device 9,
It is released into the atmosphere through the bypass discharge valve 20 and the silencer 21. If a certain period of time elapses in this state, the temperature of the air being pumped will be high (over 0°C),
The temperature on the inner surface of the transport pipe in the common ditch rises, and the frozen debris on the inner surface of the pipe is thawed and carried by the air currents.
It is transported to collection station 6 and separated. When the cleaning operation inside the pipe is completed in this way, a pressure drop is detected by the pressure gauge 17, and the operation is stopped.

When using the exhaust air from the air source 10 through the blow line 18, if the passage pipe length is short and adiabatic temperature rise cannot be expected much, the exhaust air temperature may be increased by applying a load by adjusting the opening degree of the blow valve 16. I will try to give you the following.

() Cleaning operation for the entire pipeline network If there is no common ditch 4 and all the pipelines are buried underground, it is more advantageous in terms of transfer and reception of underground heat than the transit pipes in the common ditch, so it is warmer. Instead of using a method of pumping air, operate as follows. After the garbage collection operation is completed, all supply valves 3a to 3g of each local
, open the full cutoff valves 5a to 5d, close the bypass discharge valve 20, open the blow valve 16 and close the switching valve 22 in the same manner as explained in () above,
Activate the air source 10 in the manner described in () above, inhale the atmosphere through the silencer 13 and the atmosphere intake valve 12,
After being compressed by an air source, the exhaust air is sent to blow line 1.
8 into the entire pipe network and trap the warm air. In this case, since the pipes are isolated from the atmosphere, there is no escape route for the exhaust air from the air source 10, and the pressure within the entire pipe network gradually increases. When this pressure reaches a certain set value, this is detected by the pressure gauge 17 and the air source 10 is stopped. After stopping the air source 10, the temperature at representative positions within the entire pipe network is detected by a detector (not shown), and after confirming that the frozen debris inside has melted and accumulated at the bottom of the pipes. Cleaning operation is carried out by inhaling air from the garbage storage facility 1a in order according to the regular collection operation method, and the garbage in the pipes is collected and transported to the collection station.

In the above process, since the atmosphere is used again, there is a risk of refreezing, but since the temperature inside the transport pipe is raised in advance and the amount of transported waste is small, the amount of refreezing of the waste is reduced. During this cleaning operation, the garbage accumulated in the garbage storage facility is not transported.
Make sure to suck only the atmosphere.

When blowing the exhaust air from the air source 10 into the entire pipe network,
Depending on the atmospheric temperature, the size of the pipe, the blowing time, the time for frozen waste to melt, etc., one air source 10 may be operated, or all or any number of air sources 10 may be operated. It goes without saying that an operation may be performed to increase the temperature by applying resistance to the blow valve 16 as necessary. Furthermore, if the time for the temperature to drop is shorter than the time required for the frozen adhering dust to be removed in the temperature detection described above, it is natural to replace the air with warmed air by running the system again.

() Cleaning operations when underground pipes and communal ditches are installed together Generally, communal ditches are installed at central collection points, so they are the closest to the collection station. Therefore, in the case of parallel installation like this, the operation is carried out in the order of () operation → () operation.

[Effects of the Invention] As described above, according to the present invention, after the waste transportation is completed, the exhaust gas from the air source is introduced into the transport pipe without being released into the atmosphere, and the temperature inside the pipe is increased. The following effects can be achieved.

(i) Even if moisture-containing debris freezes and adheres to the inner surface of the transport pipe, it can be removed and cleaned before the next operation.

(ii) When transporting heated exhaust air mixed with transport air, it is possible to prevent the inner surface temperature of the transport pipe from dropping, making it difficult for the phenomenon of freezing and adhesion to occur.

(iii) Since frozen deposits on the inner surface of the transport pipe do not accumulate, there is no need to increase power due to increased air resistance.

(iv) Since waste heat from the collecting air source is used, it is also part of energy saving measures.

(v) By maintaining the temperature within the transport pipeline for a long time, it can be applied even when the atmospheric temperature is very low, making it effective for application in extremely cold areas.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet for a conventional municipal waste pneumatic transportation system, and FIG. 2 is a flow sheet for a municipal waste pneumatic transportation system using the method of the present invention. 1a to 1g... Garbage storage facility, 2a, 2b... Transport pipe, 4... Community ditch, 6... Collection station, 10...
Air source, 18...Blowing line.

Claims (1)

[Claims] 1. In a device that uses negative pressure to pneumatically transport municipal waste that has been input and stored in a waste storage facility through a transport pipe to a collection station, the air on the discharge side of the collection air source built into the device A method for handling municipal waste, characterized in that a blowing line is provided between the pipe and the transport pipe to guide the exhaust air from the air source, so that all or part of the exhaust air from the air source is blown into the transport pipe. Device to prevent dust from freezing inside transport pipes in vacuum pneumatic transport.