JPS5930604B2 - Pressure detection control method in municipal waste pneumatic transportation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure detection control method that can improve the safety and reliability of a municipal waste pneumatic transportation system.

In recent years, urban waste pneumatic transportation systems have been attracting attention, and studies and technological development are progressing in various fields.

In the conventional method of supplying waste into a pipeline using a conveyor or the like and transporting it continuously, it is not possible to determine whether a blockage or excessive pressure will occur in the pipeline until after the waste has been supplied into the pipeline. If the judgment cannot be made and the pressure inside the pipeline exceeds a certain value as a result of the supply of waste, either activate the safety device and temporarily stop the supply of waste.
Alternatively, it is necessary to stop the entire system and clean the inside of the pipeline, and if an abnormal phenomenon such as a rise in pressure occurs in the pipeline, it must be dealt with accordingly, resulting in a large loss of time, and the supply and transportation of waste. Unless a system is adopted in which the system operates while detecting the state and feeding back this information, the system is unreliable and has various drawbacks.

The present invention was made with the aim of improving the safety and reliability of pneumatic transportation of waste, which has a wide variety of physical properties, sizes, and specific gravity, and whose flow conditions within the pipeline are complex. Detects the pressure inside the pipeline, calculates and compares the pressure, and if the pressure difference between the downstream and upstream sides of adjacent locations is less than the planned pressure difference for each section, it is determined to supply waste, and If the pressure difference is greater than the planned pressure difference and below the limit plan value for each section, the amount of waste to be supplied is reduced, and if the pressure difference is greater than the limit plan value for each section, the waste supply amount is reduced. The present invention relates to a pressure detection control method in a municipal waste pneumatic transportation system, which is characterized in that a stoppage is determined.

Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a conveyor that supplies waste, 2 is a pipeline that transports waste, 3 is a separator that separates waste, and 4 is a bag filter 15 that is a waste that removes fine dust. 6 is an air source for suctioning and transporting waste; 7 is a deodorizer; 8 to 13 are pressure gauges provided by dividing the pipeline 2 into n sections; pressure gauges 5 and 8 to 13 are all It is connected to the arithmetic unit 14 shown in FIG.

When the conveyor 1 is driven and garbage is continuously supplied and transported into the pipeline 2, if there is no abnormality such as a rise in pressure due to blockage of garbage in the pipeline 2, the pressure will be measured by each pressure gauge 8 to 13. pressure Δp, tΔp2tΔ'9s
tΔI)4, .

The total pressure when transporting this waste can be expressed by the following equation.

ΣΔp−ΔpA+ΔpM+Σ(Δpn−Δpn−t)・
...(1) Here, ΣΔp; Total pressure ΔpA: Air friction loss (air pipe related) ΔpM; Separator separation power loss Δpn; Pressure Δpn- actually measured by the n-th pressure gauge from the upstream side of the pipeline 1; Pressure actually measured by the (n-1)th pressure gauge from the upstream side of the pipeline When the transport of waste is being carried out smoothly, the following equation must hold.

Here, Δpa; Planned pressure difference between pressure gauges 8 and 9 Δpb: Planned pressure difference between pressure gauges 9 and 10 ΔpX; Planned pressure difference between pressure gauges 13 and 12 ΔpB; Allowable total pressure of the air source, that is, garbage transportation The actual measured values of the pressure gauges 5, 8 to 13 inside are sent to the comparison calculation device 14 in FIG. 2, where equation (i) is calculated and then compared to see if equation (ii ii) If (iii

Suppose that garbage becomes clogged or stagnates in the pipeline while it is being transported.

If this happens, the resistance in that part will increase, and the pressure difference between the pressure gauges in that part will become larger than the planned value, and in some cases, the total pressure ΣΔp may become larger than the allowable total pressure (pB) of the air source.

Therefore, the following equation holds true due to the abnormal pressure rise.

That is, the actual measured values of the pressure gauges 5, 8 to 13 during garbage transportation are sent to the comparison calculation device 14 shown in FIG. ,(
IV) If any one of the equations or (V) holds true, then the next technique (ivl is compared where Δp I tΔp b′..., ΔpX; limit plan for each section If the value (■1) is satisfied, even if the equation (■) is established, a signal to continue the continuous supply is sent, and the transportation of waste is continued.

If the equation (vl) does not hold, the following relationship holds.

&ii If even one of the D formulas holds true, a signal to adjust the continuous supply amount or stop is sent to the conveyor 1, and the pipeline 2
The supply of waste inside is regulated.

A part of the waste transported in the pipeline 2 is discharged to the separator 3, and when the relationship between each pressure satisfies the equation (11) θ11), a signal to restore continuous supply is sent to the conveyor 1, The conveyor 1 resumes the normal supply of waste into the pipeline 2.

Each pressure gauge 8 to 13 in case of abnormality in the pipeline
An example of the actual measured value of the pressure is shown in Figure 3.

This indicates that an abnormality has occurred between the pressure gauges 8 and 9, and it can be seen that Δp2 - Δp1 is larger than during normal operation.

Immediately before an abnormality such as a blockage occurs in the pipeline, the following relational expression holds true.

Σ(ΔT)n-ΔT'n-t)≧Δps...
...0 songs ΣΔp≦ΔpB
...... (IX) Here, the planned value of Δps; Σ (ΔI) n - ΔI) n
The formula (1) is calculated, and then (Viii) (IX
) are compared, and if the equation (viiHx) holds true, a continuous supply reduction signal is sent to the conveyor 1, and the supply of waste into the pipeline 2 is reduced.

However, some of the garbage transported through Pipeline 2
When the conveyor 1 is discharged to the separator 3 and the relationship between the pressures satisfies the equation (ii

In the embodiments of the present invention, the case where the garbage is transported by suction is explained, but it is also possible to adopt the case where the garbage is transported by a pressure-feeding method, and various other changes can be made without departing from the gist of the present invention. Of course, it is also possible to add

As described above, the pressure detection control method in the municipal waste pneumatic transportation system of the present invention allows the supply of waste to be adjusted based on the signals sent from the pressure gauges provided in n sections of the pipeline. (I) Abnormal pressure rise due to garbage can be detected in advance, so garbage can be transported continuously without causing blockage in the pipeline.

(2) The reliability of the system is improved because the system is operated while constantly monitoring the supply and transportation status of waste.

(iii) If an abnormal pressure that causes a blockage phenomenon occurs, the location can be displayed on the control center, which is convenient when cleaning the blockage part of the pipeline.

etc., exhibits various excellent effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the pressure detection control method in pneumatic municipal waste transportation of the present invention, FIG. 2 is a control block diagram of the pressure detection control method in pneumatic municipal waste transportation of the present invention, and FIG.
The figure is a graph showing the relationship between pressure measured by a pressure gauge installed in the pipeline and time. 1 is a conveyor, 2 is a pipeline, 3 is a separator, 5.8
~13 indicates a pressure gauge.

Claims (1)

[Claims] 1 Detect the pressure inside the pipeline at multiple points along the pipeline, calculate and compare the pressures, and if the pressure difference between the downstream and upstream sides of adjacent points is less than the planned pressure difference for each section, Decide on the supply of waste, and if the pressure difference is larger than the planned pressure difference and below the limit plan value for each section, reduce the amount of waste supply, and if the pressure difference is less than the limit plan value for each section. 1. A pressure detection control method in a municipal waste pneumatic transportation system, characterized in that if the pressure is too large, it is decided to stop the supply of waste.