JP2002168139A - Feeding system for waste plastic generating oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeding system for waste plastic generating oil capable of feeding a mixture of generation oil and A heavy oil mixed in an appropriate ratio to a combustion device. SOLUTION: This feeding system for waste plastic generating oil is equipped with a generation oil feeding line 2 for feeding the generation oil from a waste plastic processing device 30; a A heavy oil feeding line 3 for feeding the A heavy oil; and a mixing tank 1 for mixing the generation oil and the A heavy oil. The mixture oil from the mixing tank is fed to an engine 13 through a mixture oil line 31. A signal from a mixture oil viscosity sensor 10 of a mixture oil line 31 is inputted in a control device 18, and a generation oil control valve 4 and an A heavy oil control valve 5 are controlled with the control device 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste plastic producing oil supply system for supplying waste plastic producing oil to an engine.

[0002]

2. Description of the Related Art Hitherto, a system has been developed in which a waste plastic processing apparatus treats waste plastic to produce waste plastic production oil.

[0003] Waste plastics processing equipment is a recent process technology, and the C generated from the waste plastics processing equipment is used.
It is known that heavy oil-equivalent oil can be used as fuel for diesel engines. However, there is no actual example, and a specific control method has not yet been developed. For this reason, a system in which a conventionally applied fuel line is directly applied to the generated oil is generally used.

[0004] In addition, although the analysis of the produced oil has been performed, no control system based on the result of a diesel engine combustion test has been developed.

[0005]

When the generated oil from the waste plastic processing apparatus is directly burned by a diesel engine, the kinematic viscosity of the generated oil as the engine fuel is maintained at a constant value and the kinematic viscosity of the generated oil is kept constant. Need to be kept. In general, the kinematic viscosity of a commercially available fuel such as fuel oil A does not require any special measures because it is in a fluid state at room temperature. However, the oil produced by the waste plastic processing equipment is equivalent to fuel oil C and has a fluidity at room temperature. And must be used at 50 ° C or higher. Therefore, when the oil produced by the waste plastic processing apparatus is directly burned by the diesel engine, it is difficult to supply the oil to the diesel engine stably because of lack of fluidity.

In addition, the generated oil generally contains a large amount of wax, which causes clogging of the engine fuel filter. If the filter is frequently replaced or left as it is, the fuel is clogged in the filter and the engine stops. May be.

[0007] The present invention has been made in view of such a point, and while ensuring fluidity, appropriately mixing heavy fuel oil A and generated oil to prevent clogging of an engine fuel filter, It is an object of the present invention to provide a waste plastic production oil supply system capable of appropriately operating the oil supply system.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a product oil supply line to which product oil from a waste plastic processing apparatus is supplied, a fuel oil A supply line to which fuel oil A is supplied, and a product from a product oil supply line. A mixing tank in which oil and heavy oil A from the heavy fuel oil supply line are mixed to produce a mixed oil; a combustion device in which the mixed oil from the mixing tank is supplied through the mixed oil line; A production oil control valve and an A heavy oil control valve respectively provided in the heavy oil supply line, and a mixed oil viscosity sensor is provided in the mixed oil line, and the produced oil is produced by the control device based on a signal from the mixed oil viscosity sensor. A waste plastic production oil supply system, wherein at least one of a control valve and an A fuel oil control valve is controlled.

The present invention provides a product oil supply line to which product oil from a waste plastic processing apparatus is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from a product oil supply line, and a fuel oil supply A A mixing tank in which the A fuel oil from the line is mixed to produce a mixed oil, and a combustion device in which the mixed oil from the mixing tank is supplied through the mixed oil line; a mixed oil viscosity sensor in the mixed oil line; A mixed plastic heater is provided, and a mixed plastic heater is controlled by a control device based on a signal from a mixed oil viscosity sensor.

The present invention provides a product oil supply line to which product oil from a waste plastic processing apparatus is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from a product oil supply line, and a fuel oil A supply A mixing tank in which fuel oil A from the line is mixed to produce a mixed oil; a combustion device in which the mixed oil from the mixing tank is supplied through the mixed oil line; and a fuel oil supply line and a fuel oil A supply line. A fuel filter having a differential pressure sensor in the mixed oil line, and based on a signal from the differential pressure sensor, the control device generates the generated oil control valve and the A heavy oil control valve. A waste plastic production oil supply system, wherein at least one of the control valves is controlled.

The present invention provides a product oil supply line to which product oil from a waste plastic processing apparatus is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from a product oil supply line, and a fuel oil A supply A mixing tank in which A fuel oil from the line is mixed to produce a mixed oil, and a combustion device to which the mixed oil from the mixing tank is supplied through a mixed oil line;
A heavy oil supply line is provided with a bypass line that joins the mixed oil supply line, a mixed oil switching valve is provided upstream of the junction of the mixed oil supply line with the bypass line, and an A heavy oil switching valve is provided in the bypass line, Providing a fuel filter having a differential pressure sensor in an oil line, and controlling at least one of a mixed oil switching valve and an A heavy oil switching valve by a control device based on a signal from the differential pressure sensor; Oil supply system.

[0012] The present invention provides a product oil supply line to which product oil from a waste plastic processing apparatus is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from a product oil supply line, and a fuel oil supply A A mixing tank in which A fuel oil from the line is mixed to produce a mixed oil, and a combustion device to which the mixed oil from the mixing tank is supplied through a mixed oil line;
A heavy oil supply line is provided with a bypass line that joins the mixed oil supply line, a mixed oil switching valve is provided upstream of the junction of the mixed oil supply line with the bypass line, and a heavy oil switching valve A is provided in the bypass line, and combustion is performed. An exhaust gas line is provided in the device, an exhaust gas sensor is provided in the exhaust gas line, and at least one of the mixed oil switching valve and the A heavy oil switching valve is controlled by a control device based on a signal from the exhaust gas sensor. It is a waste plastic production oil supply system.

[0013] The present invention provides a product oil supply line to which product oil from a waste plastic processing apparatus is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from a product oil supply line, and a fuel oil supply A A mixing tank in which fuel oil A from the line is mixed to generate a mixed oil; and a combustion device in which the mixed oil from the mixing tank is supplied through the mixed oil line. An oil supply system for waste plastics, wherein an oil viscosity sensor is provided, and a control device controls a generated oil filter based on a signal from the generated oil viscosity sensor.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, an embodiment of a waste plastic oil supply system according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of a waste plastic production oil supply system.

As shown in FIG. 1 and FIG.
Oil, a fuel oil supply line 2 to which fuel oil from A is supplied, a fuel oil supply line 3 to which fuel oil A is supplied, a fuel oil from the fuel oil supply line 2, and fuel oil A from the fuel oil A supply line 3 are mixed. And a diesel engine (combustion device) 13 to which the mixed oil from the mixing tank 1 is supplied through a mixing line 31.

A generated oil filter 20, a generated oil control valve 4, a generated oil flow sensor 6, and a generated oil viscosity sensor 19 are sequentially attached to the generated oil supply line 2. An A fuel oil control valve 5 and an A fuel oil flow sensor 7 are sequentially attached to the A fuel oil supply line 3.

The mixed oil line 31 is provided with a mixed oil heater 8, a mixed oil temperature sensor 9, a mixed oil viscosity sensor 10, a fuel filter 11, and a mixed oil switching valve 15 sequentially.
A differential pressure sensor 12 is attached to the fuel filter 11.

Further, the A fuel oil supply line 3 is provided with an A fuel oil control valve 5 and an A fuel oil flow sensor 7.
Further, a bypass line 17 that joins the mixed oil supply line 31 is provided in the A heavy oil supply line 3, and an A heavy oil switching valve 16 is attached to the bypass line 17. In addition, the mixed oil switching valve 15 is one of the mixed oil supply lines 31.
It is located upstream from the junction with the bypass line 17.

Further, the diesel engine 13 is provided with an exhaust gas line 32, and the exhaust gas Iran 32 is provided with an exhaust gas sensor 14.

Signals from the generated oil flow sensor 6, the A heavy oil flow sensor 7, the generated oil viscosity sensor 19, the mixed oil temperature sensor 9, the mixed oil viscosity sensor 10, and the differential pressure sensor 12 are sent to the controller 18. It has become. Further, the control device 18 controls the generated oil filter 20, the generated oil control valve 4, the A heavy oil control valve 5, the mixed oil heater 8, and the diesel engine 13.

In FIG. 1, a fuel filter 11 supplements fuel impurities, and a differential pressure generated by the clogging is detected by a differential pressure sensor 12. Further, the exhaust gas sensor 14 is a sensor that detects NOx, SOx, CO, smoke, etc. of the exhaust gas of the diesel engine 13. Further, when the differential pressure sensor 12 issues a closing signal, or when the exhaust gas sensor 14 issues an exhaust gas concentration abnormal signal, the mixed oil switching valve 15 closes and the A heavy oil switching valve 16 opens. Further, the generated oil viscosity sensor 19
This is a viscosity sensor that measures the viscosity of the generated oil that has been cleaned by the generated oil filter 20. Further, the control device 18 receives a signal from each sensor, performs a control calculation such as a PID calculation, and outputs an operation signal to each control target.

Next, the operation of the present embodiment having the above configuration will be described. First, the generated oil generated by the waste plastic processing apparatus 30 is supplied through the generated oil supply line 2. However, since the generated oil has high viscosity and poor fluidity, it is mixed with the A heavy oil supplied from the A heavy oil supply line and the mixing tank. 1 to improve its flowability.

The mixed oil in the mixed oil tank 1 is sent to the diesel engine 13 through the mixed oil line 31. Exhaust gas from the diesel engine 13 is sent to the exhaust gas line 3
It is discharged from 2 to the outside.

During this time, a signal from the mixed oil viscosity sensor 10 is sent to the control device 18 and the viscosity control function 21
Then, the preset viscosity set value is compared with the signal of the mixed viscosity sensor 10, and when the signal from the mixed oil viscosity sensor 10 becomes higher than the set viscosity, the control device 18 opens the heavy oil control valve 5. Then, the amount of Fuel Oil A is increased to lower the viscosity in the mixing tank 1 (FIG. 2). On the other hand, when the signal from the mixed oil viscosity sensor 10 becomes lower than the set viscosity, the control device 18 closes the A heavy oil control valve 5, and
The viscosity in the mixing tank 1 is increased by decreasing the amount of the heavy fuel oil A.

The generated oil control valve 4 is controlled by the control device 18 so that the flow rate of the generated oil is set in advance. The generated oil control valve 4 is replaced with the heavy oil control valve 5 by a mixed oil viscosity sensor. It may be controlled by a signal from 10. By changing the mixing amount (mixing ratio) of the produced oil and the heavy oil A in this manner, the mixed oil is controlled to have an appropriate viscosity as a diesel engine fuel. The control valves 4 and 5 may be operated by an electric mechanism, a servo mechanism, a hydraulic mechanism, or the like.

In this embodiment as described above, it has been confirmed by a combustion test of the engine that when the mixed fuel of the generated oil and the heavy oil A is used as the engine fuel, the viscosity of the mixed oil should be within the specified range. ing. Based on this result, an appropriate viscosity can be obtained by adjusting the amounts of the product oil and heavy oil A mixed in the mixed oil tank 1, and the simplest and economical operation can be performed.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described below.

The second embodiment differs from the first embodiment only in the configuration of the control device 18, but is otherwise the same as the first embodiment.

As shown in FIGS. 3 and 4, in the second embodiment, the control device 18 controls the mixed oil heater 8 based on a signal from the mixed oil viscosity sensor 10 so as to reach a target temperature. Is what you do.

As shown in FIGS. 3 and 4, the mixed oil flowing out of the mixing tank 1 is heated by a mixed oil heater 8, supplied to a diesel engine 13 through a fuel filter 11, and burned. The range of the viscosity of the mixed oil used as fuel is determined in the diesel engine 13.
The oil mixture must be maintained at that viscosity.

First, a signal from the mixed oil viscosity sensor 10 is input to a “viscosity-temperature” characteristic function 23 in the controller 18.
This "viscosity-temperature" characteristic will be described with reference to FIG. FIG. 3 shows a "viscosity-temperature" characteristic curve, in which the horizontal axis represents the viscosity and the vertical axis represents the temperature, and the signal from the mixed oil viscosity sensor 10 is plotted on the viscosity on the horizontal axis. It is determined.

This characteristic curve is determined by the analysis of the mixed oil. Since the components and the viscosity fluctuate depending on the production process of the produced oil, the characteristic curve is set so that the temperature can be appropriately adapted to the variation.

In the "viscosity-temperature" characteristic function 23,
The target temperature determined by the "viscosity-temperature" characteristic is input to the viscosity control function 22, and the viscosity control function 22 controls the mixed oil heater 8 so as to reach the target temperature.

A and C shown in FIG. 3 indicate the lower limit of the setting, B and D indicate the upper limit, and E indicates the result of obtaining the target temperature based on the signal of the mixed oil viscosity sensor 10.

On the other hand, a signal from the differential pressure sensor 12 is input to a viscosity control function 22 in the control device 18 to control a temperature corresponding to a differential pressure change amount as a correction value of a target temperature. This is performed for the purpose of preventing the fuel filter 11 from clogging, and when the value from the differential pressure sensor 12 increases,
It is determined that clogging of the fuel filter 11 has occurred, the target temperature is raised, the mixed oil heater 8 is operated, and the passage of the fuel filter 11 is promoted by increasing the fluidity of the fuel. Next, when the value from the differential pressure sensor 12 falls below the specified value, it is determined that the clogging of the fuel filter 11 has been released, and the “viscosity-temperature” characteristic curve of the “viscosity-temperature” characteristic function 23 is used. The control of the mixed oil heater 8 is performed so as to reach the determined target temperature.

According to the present embodiment, the fluidity can be improved by controlling the temperature of the mixed oil, the mixing ratio of the generated oil can be increased, and the generated oil to be burned by the diesel engine can be increased. Things become possible. Further, the engine is not stopped due to the blockage by the fuel filter 11. The “viscosity-temperature” characteristic function 23
, Temperature setting corresponding to a change in viscosity becomes possible, and fluctuations in temperature can be suppressed.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is the same as the first embodiment except for the configuration of the control device 18. FIG.
, A signal from the differential pressure sensor 12 is input to a differential pressure control function 24 in the control device 18. This differential pressure control function 2
In 4, when the signal of the differential pressure sensor 12 exceeds a predetermined value, it is determined that the clogging of the fuel filter 11 is in progress. At this time, the differential pressure control function 2
4 opens the A fuel oil control valve 5, whereby the amount of the A fuel oil increases in the mixing tank 1 and the mixed oil having improved fluidity is supplied to the fuel filter 11, and the clogging of the fuel filter 11 is gradually reduced. Head to release.

Next, when the signal from the differential pressure sensor 12 becomes equal to or less than the specified value, it is determined that the clogging of the fuel filter 11 has been released, and the control returns to the initially set mixing ratio control. That is, for example, in the case of the control set by the 50% mixing ratio control, the control valves 4 and 5 are controlled so that the signal from the generated oil flow sensor 6 and the signal from the A heavy oil flow sensor 7 become equal. 24.

According to the present embodiment, the viscosity of the mixed oil is reduced by increasing the amount of the A-heavy oil entering the mixing tank 1, and the fuel filter 11 is prevented from being blocked.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is the same as the first embodiment except for the configuration of the control device 18.

As shown in FIG. 6, when the differential pressure sensor 12 generates a signal indicating that the fuel filter 11 is closed, the signal is input to a differential pressure / exhaust gas control function 25 in the control device 18. At this time, the fuel filter 11 is determined to be closed, and the differential pressure / exhaust gas control function 25 outputs a closing operation signal to the mixed oil switching valve 15 and simultaneously outputs an opening operation signal to the A heavy oil switching valve 16. Accordingly, when the fuel filter 15 is clogged during the operation with the mixed oil, the fuel oil is automatically switched to the A heavy oil, and the operation is continued without stopping the diesel engine 13. Note that the differential pressure / exhaust gas control function 25 of the control device 18 may control at least one of the mixed oil switching valve 15 and the A heavy oil switching valve 16.

In FIG. 6, when the exhaust gas sensor 14 emits an exhaust gas abnormality signal, the signal is transmitted to the control unit 1.
8 is input to a differential pressure / exhaust gas control function 25. At this time, it is determined that the engine exhaust gas is abnormal, and the differential pressure / exhaust gas control function 25 outputs a closing operation signal to the mixed oil switching valve 15 and simultaneously outputs an opening operation signal to the A heavy oil switching valve 16. Accordingly, when the exhaust gas of the diesel engine 13 is in an abnormal state during operation with the mixed oil, the diesel engine 18 is automatically switched to the heavy fuel oil A, and the exhaust gas from the diesel engine 18 returns to the normal state. The operation is continued without stopping.

Here, the exhaust gas is, for example, NOx, SOx,
It is the concentration of smoke, CO, etc.

When the fuel filter 11 is closed, it is possible to switch to the heavy fuel oil A supplied from the bypass line 17 and continue the operation without stopping the operation of the diesel engine 13.

When the concentration of the exhaust gas of the diesel engine is abnormal, the operation can be continued by switching to the heavy fuel oil A supplied from the bypass line 17 without stopping the engine.

Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment is the same as the first embodiment except that the operation of the control device 18 is different.

The signal from the generated oil viscosity sensor 19 is transmitted to the controller 1
When the generated oil viscosity is input to the wax removal function 26 in the controller 8 and the viscosity of the generated oil becomes equal to or more than the specified value, a cleaning command is issued to the generated oil filter 20 by the wax removal function 26 in the control device 18 and the generated oil filter 20 is controlled. Is performed. When the generated oil viscosity becomes equal to or less than the specified value, the cleaning instruction of the generated oil filter 20 is released. This is for the purpose of removing the wax component before mixing in the mixing tank 1 because the wax component contained in the produced oil has an important factor in determining the mixing ratio of the mixed oil. I have.

Since the generated oil is a fuel containing a large amount of wax components, it is removed by the wax removal filter 20 without directly entering the mixing tank 1. Therefore, the control of the mixing amount in the mixing tank 1 and thereafter becomes easy.

In each of the above embodiments, the control device 18 may be configured so as to include all the operation modes in the above embodiments.

By combining the embodiments, it is possible to maintain the kinetic viscosity of the mixed fuel supplied to the diesel engine 13 in an appropriate state, and to ensure fluidity. Further, the mixing ratio of the heavy oil A and the generated oil is appropriately determined to prevent the engine fuel filter 11 from being clogged, and further, the mixed fuel is prevented from being stopped due to the clogging of the fuel filter 11 or the engine exhaust gas abnormality. It is possible to do.

In the above embodiment, the case where fuel is supplied to the diesel engine has been described.
This method is applicable not only to diesel engines but also to fuels for boilers.

[0053]

As described above, according to the present invention, it is possible to maintain the viscosity of the mixed fuel of the generated oil and the heavy fuel oil A to be supplied to a combustion device such as a diesel engine in an appropriate state, and to ensure fluidity. It becomes possible. In addition, the mixing ratio between the heavy oil A and the generated oil can be appropriately set, and the amount of combustion of the generated oil can be maximized. Further, clogging of the fuel filter can be prevented, and when clogging occurs, the engine is not stopped because the operation using heavy fuel oil A is performed. Further, even when the exhaust gas concentration from the combustion device becomes abnormal, it is possible to automatically switch to the operation using the heavy fuel oil A, and it is possible to avoid stopping the engine.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of a waste plastic production oil supply system according to the present invention.

FIG. 2 is a diagram showing an operation of a control device of the waste plastic production oil supply system.

FIG. 3 is a diagram showing a “viscosity-temperature” characteristic of a “viscosity-temperature” characteristic function.

FIG. 4 is an operation diagram showing a second embodiment of the waste plastic production oil supply system according to the present invention.

FIG. 5 is an operational view showing a third embodiment of the waste plastic production oil supply system according to the present invention.

FIG. 6 is an operational diagram showing a fourth embodiment of the waste plastic production oil supply system according to the present invention.

FIG. 7 is an operational view showing a fifth embodiment of the waste plastic production oil supply system according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mixing tank 2 generated oil supply line 3 A heavy oil supply line 4 generated oil control valve 5 A heavy oil control valve 6 generated oil flow sensor 7 A heavy oil flow sensor 8 mixed oil heater 9 mixed oil temperature sensor 10 mixed oil viscosity sensor 11 fuel filter REFERENCE SIGNS LIST 12 differential pressure sensor 13 diesel engine 14 exhaust gas sensor 15 mixed oil switching valve 16 A heavy oil switching valve 17 bypass line 18 control device 19 generated oil viscosity sensor 20 generated oil filter 21 viscosity control function 22 viscosity control function 23 “viscosity-temperature” characteristic Function 24 Differential pressure control function 25 Differential pressure / exhaust gas control function 26 Wax removal function

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F02D 45/00364 F02D 45/00 364K 4H029 F02M 31/125 F02M 43/02 43/02 63/00 U 63/00 31 / 12 321D F-term (Reference) 3G060 AA02 BA19 CA01 CC02 FA04 GA04 3G066 AA07 AB03 AB06 AD02 BA12 BA32 BA43 DA01 DC11 DC24 DC25 3G084 AA01 BA11 BA26 DA34 EC03 FA14 FA29 FA31 3G092 AA02 AB04 AB12 BB01 DE02Y DEBZ15 FA05Z 4H013 AA06 4H029 CA15 CA16

Claims (6)

[Claims] 1. A product oil supply line to which a product oil from a waste plastic processing device is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from a product oil supply line, and a product oil from a fuel oil A supply line A mixing tank in which the mixed oil is mixed to produce a mixed oil, a combustion device in which the mixed oil from the mixing tank is supplied through a mixed oil line, a generated oil supply line and a heavy oil supply line A generated oil control valve and an A fuel oil control valve, a mixed oil viscosity sensor is provided in the mixed oil line, and the control device controls the generated oil control valve and the A fuel oil control valve based on a signal from the mixed oil viscosity sensor. A waste plastic production oil supply system characterized by controlling at least one of them. 2. A generated oil supply line to which the generated oil from the waste plastic processing apparatus is supplied, a heavy oil supply line to which the heavy oil A is supplied, a generated oil from the generated oil supply line, and a heavy oil supply line A mixing tank in which the fuel oil A is mixed to produce a mixed oil; and a combustion device in which the mixed oil from the mixing tank is supplied through a mixed oil line. A waste plastic generation oil supply system, comprising: a heater; and a controller that controls the mixed oil heater based on a signal from the mixed oil viscosity sensor. 3. A generated oil supply line to which the generated oil from the waste plastic processing apparatus is supplied, a A heavy oil supply line to which the A heavy oil is supplied, a generated oil from the generated oil supply line, and a A oil supply line A mixing tank in which the mixed oil is mixed to produce a mixed oil, a combustion device in which the mixed oil from the mixing tank is supplied through a mixed oil line, a generated oil supply line and a heavy oil supply line A fuel filter having a differential pressure sensor is provided in the mixed oil line, and the generated oil control valve and the A heavy oil control valve are controlled by the control device based on a signal from the differential pressure sensor. A waste plastic producing oil supply system, wherein at least one of the two is controlled. 4. A generated oil supply line to which the generated oil from the waste plastic processing device is supplied; a heavy oil supply line to which the heavy A oil is supplied; a generated oil from the generated oil supply line; And a combustion device in which the mixed oil from the mixing tank is supplied through a mixed oil line, and joins the mixed oil supply line with the A heavy oil supply line. A bypass line is provided, a mixed oil switching valve is provided upstream of a junction of the mixed oil supply line with the bypass line, an A heavy oil switching valve is provided in the bypass line, and a fuel filter having a differential pressure sensor in the mixed oil line is provided. Waste plastic characterized in that a control device controls at least one of a mixed oil switching valve and an A heavy oil switching valve based on a signal from a differential pressure sensor. Generated oil supply system. 5. A product oil supply line to which product oil from a waste plastic processing device is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from the product oil supply line, and a product oil from the fuel oil A supply line And a combustion device in which the mixed oil from the mixing tank is supplied through a mixed oil line, and joins the mixed oil supply line with the A heavy oil supply line. A bypass line is provided, a mixed oil switching valve is provided upstream of the junction of the mixed oil supply line with the bypass line, an A heavy oil switching valve is provided in the bypass line, and an exhaust gas line is provided in the combustion device. An exhaust gas sensor, and a control device controls at least one of the mixed oil switching valve and the A heavy oil switching valve based on a signal from the exhaust gas sensor. A waste plastic production oil supply system characterized by the following. 6. A product oil supply line to which product oil from a waste plastic processing device is supplied, a fuel oil A supply line to which fuel oil A is supplied, a product oil from the product oil supply line, and a product oil from the fuel oil A supply line A mixing tank in which the heavy oil A is mixed to produce a mixed oil, and a combustion device in which the mixed oil from the mixing tank is supplied through a mixed oil line. The generated oil filter and the generated oil viscosity are provided in the generated oil supply line. A waste plastic generation oil supply system, comprising: a sensor; and a control device that controls the generation oil filter based on a signal from the generation oil viscosity sensor.