JPH09112799A - Transferring method for easily clogged fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repeatedly clean the inside of a piping so as to flow fluid without lowering a flow amount, by arranging a flow regulating valve on the way of the piping, and adjusting the opening of the flow adjusting valve so as to increase a liquid flow amount pulsatively led to flow. SOLUTION: A flow meter 11 and a flow regulating valve 12 are arranged in series in a piping 10 through which fluid easily clogged such as waste plastic melt is transferred. The flow meter 11 measures a liquid flow amount in the piping 10, and the fluid flow amount 18 outputted by an electric signal and inputted to a controller 13. The flow regulating valve 12 is driven by compressed air or a motor, and the opening thereof is determined by the electric signal outputted from the controller 13. An external timer 14 is attached to the controller 13 so that time T1 for normal valve opening by which a normal flow amount is led to flow and time T2 for enlarged valve opening when the valve opening is opened, can be optionally determined. When T1 is timed up, the valve opening is made to be further enlarged valve, and when T2 is timed up, the valve opening is made to be the normal valve opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring a fluid such as a waste plastic melt obtained by melting waste plastic at a high temperature, which tends to be clogged.

[0002]

2. Description of the Related Art For example, as a method for treating waste plastic to recover oil, a method for producing a low boiling point hydrocarbon oil described in JP-A-3-86791 has been proposed.
In this method, waste plastic which has been crushed and further reduced in volume is heated using an extruder, introduced into a melt mixing tank in a molten state, and then introduced into the next thermal decomposition tank. The vaporous product decomposed in this thermal decomposition tank is introduced into the zeolite catalyst tank and the condenser after the liquid content accompanying it is separated in the next separator, and is separated into the liquid content and the gas content. . And
A heating furnace is connected through a centrifuge for separating sludge contained in the thermal decomposition tank, and the temperature is 350 to 450 ° C.
Circulating the waste plastic melt heated to. Then, the waste plastic melt flows through the pipes into the above-mentioned melt mixing tank, thermal decomposition tank, and heating furnace.

[0003]

However, when a solid solution or a slurry solution such as a waste plastic melt is transferred, the transfer fluid is gradually deposited on the inner wall of the pipe.
There is a problem that the flow rate gradually decreases. On the other hand, when the fluid is a powder or granular material, it is possible to inject high-pressure air or the like to perform flushing, but in the case of a solid solution or a slurry solution, it is diluted by an external injection medium (liquid) to exert an influence. Further, in the case of high temperature fluid, there is a problem that the auxiliary device becomes complicated. The present invention has been made in view of the above circumstances, and provides a method for transferring a fluid that easily flows without causing a decrease in the flow rate of a liquid that is relatively easily blocked, such as a solid solution or a slurry solution. The purpose is to

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The method of transferring a fluid that is easily clogged is to provide a flow rate adjusting valve in the middle of the pipe, and normally squeeze the flow rate adjusting valve to flow the fluid.
Periodically or when the pipe flow rate decreases, the flow rate control valve is further opened to constantly allow a fluid larger than the flow rate to flow in a pulsed manner.

[0005]

The method for transferring a fluid which is apt to be clogged according to claim 1,
A flow rate adjusting valve is installed in the middle of the piping to constantly throttle it so that the required flow rate can flow. Then, periodically or when the flow rate of the pipe decreases, the flow rate adjusting valve is further opened to constantly flow a fluid larger than the flow rate in a pulsed manner.
The fluid adhering to the inside of the pipe is removed by a pulsed flow. If you want to open the valve opening of the flow rate adjusting valve on a regular basis, you can easily control it with a timer, but if you want to open the valve opening of the flow rate adjusting valve when the flow rate in the pipe decreases, use a flow meter. It is necessary to open the valve opening when the provided and measured flow rate is below a certain value. Then, in the case of control by a timer or the like, the preset value of the timer, that is, the time for which the flow rate adjusting valve is opened and a fluid larger than the flow rate is constantly flowed in a pulsed manner, and the pulse interval is changed to adjust the overall flow rate. The timer value is determined so that a predetermined flow rate will flow. Then, when the control is performed based on the set timer value, the inside of the pipe is cleaned by the fluid increased by opening the valve opening of the flow rate adjusting valve in a pulsed manner, and the cleaning material (including solid matter) attached to the pipe is also included. Most of) flows without adhering to the inside of the pipe again.

[0006]

Therefore, according to the method of transferring a fluid which is likely to be clogged according to the first aspect of the present invention, a flow rate adjusting valve is provided in the middle of the pipe, and the valve opening is adjusted to increase the flow rate of the liquid flowing in a pulsed manner. Therefore, the inside of the pipe is repeatedly washed, and the fluid can flow without causing a decrease in the flow rate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. Here, FIG. 1 is an explanatory diagram of a method of transferring a fluid that is easily clogged according to an embodiment of the present invention, and FIG. 2 is a flow chart thereof.

As shown in FIG. 1, a flow meter 11 is installed in a pipe 10 for transferring a fluid such as a waste plastic melt which tends to be clogged.
And the flow rate adjusting valve 12 are installed in series. The flow meter 11 measures the flow rate of the fluid in the pipe 10, and the flow rate is preferably output by an electric signal and input to the control device 13. The flow rate adjusting valve 12 is driven by compressed air or a motor, and the opening degree of the valve is controlled by the control device 13.
It is determined by the electrical signal output from. An external timer 14 is attached to the control device 13,
The time T1 of the normal valve opening for flowing the normal flow rate and the time T2 of the expansion valve opening in the open state can be arbitrarily determined. The timer 14 may be arranged inside the control device 13.

The control device 13 includes a programmable controller or a control computer, and has a CP inside.
U, RAM and ROM connected thereto, an interface connected to these, and an output circuit for adjusting the valve opening of the flow rate adjusting valve 12. In the ROM, a program that applies the method of transferring a fluid that easily clogs according to an embodiment of the present invention is described.

Next, a method of transferring a fluid that easily clogs according to an embodiment of the present invention using the above apparatus will be described with reference to FIG. The flow rate adjusting valve 12 is set to the normal valve opening for allowing the normal flow rate, and the time T1 of the normal valve opening is set by the timer 14 (step S1). In this case, the normal valve opening is the flow rate of the flow rate in the pipe 10.
The valve opening is 30 to 50%
Flow control valve 12 so that the flow rate required in
Is selected. It should be noted that, except for the case where the fluid flows through the pipe due to the drop, it is assumed that the fluid is being transferred through the pipe by a pump having a sufficient capacity.

When the time T1 is timed up (step S2), whether the valve opening is 1% or more is judged by the output of the sensor of the flow rate adjusting valve 12 (step S).
3). This is to confirm that the flow rate adjusting valve 12 is open and the equipment is in operation. Then, the current normal valve opening is stored in the buffer (memory), and the flow control valve 12 is set to the expansion valve opening with the valve opening further opened,
The timer 14 is turned on and the time T2 of the expansion valve opening is counted (step S4). The expansion valve opening is 100
%, But 30-40% of the valve opening at normal flow rate
Other valve openings (for example, 70 to 90%) may be used as long as the valve openings are sufficiently larger.

Time T2 is up (step S
5), the flow rate adjusting valve 12 is adjusted to return to the normal valve opening stored in the buffer, and the fluid is sent at the normal valve opening (step S6). Repeating the above steps, piping 1
It is possible to transfer a fluid that is easily blocked without blocking 0. The actual time T1 is about 50 seconds and T2 is 1
It was about 0 seconds.

In the above embodiment, the timer 14
Although the time of the normal valve opening is determined by counting with, the flow rate flowing by the flow meter 11 is measured, and when a constant flow rate (for example, 80% of the steady flow rate) is reached,
It is also possible to open the flow rate adjusting valve 12 to increase the flow rate, which allows control in accordance with the physical properties of the fluid. Further, when controlling mainly the valve opening of the flow rate adjusting valve 12, the flow meter 11 is not always necessary. Further, the expansion valve opening time may be a short time if a large amount of fluid flows.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an apparatus to which a method for transferring a fluid that easily clogs according to an embodiment of the present invention is applied.

FIG. 2 is a flowchart illustrating the operation of the method.

[Explanation of symbols]

 10 Piping 11 Flowmeter 12 Flow Control Valve 13 Controller 14 Timer

Front page continued (72) Inventor Kenji Matsuda 46-59, Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture Machinery & Plant Division, Nippon Steel Corporation (72) Hideyuki Ando 46, Nakahara, Tobata-ku, Kitakyushu, Fukuoka 59 Nittetsu Plant Design Co., Ltd.

Claims (1)

[Claims] 1. A flow control valve is provided in the middle of a pipe, and the flow control valve is constantly throttled to allow a fluid to flow, and the flow control valve is further opened at regular intervals or when the flow rate of the pipe is reduced to keep the flow rate higher than the normal flow rate. A method for transferring a fluid which easily clogs, characterized in that a large amount of fluid is caused to flow in a pulsed manner.