JP2000034959A - Fuel mixing device and diesel engine having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always keep specified viscosity of oil prepared by mixing different fuel, in respect to a fuel mixing device for mixing different fuel and a diesel engine device having the mixing device. SOLUTION: This type of fuel mixing device has two input pipe passages 29, 31 through which different fuels 21, 25 are respectively flowed, a mixing valve 33 connected to the input pipe lines 29, 31 for mixing the fuels 21 and 25 with each other, and an output pipe line 49 for flowing mixed fuel 47. In this case, a viscosity sensing means 57 is arranged for sensing the viscosity of the mixed fuel 47 and outputting the sensed viscosity. In addition, valve opening adjusting means 61, 43 are arranged for obtaining the opening of the mixing valve 33 based on the viscosity, and adjusting the opening of the mixing valve 33 to the obtained value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel mixing device for mixing different fuels to a predetermined viscosity and a diesel device provided with the fuel mixing device.

[0002]

2. Description of the Related Art Diesel engines are used in various applications as internal combustion engines that can use not only fuel oil A and light oil as fuel, but also food oil such as rapeseed oil as fuel. Generally, food oil has a high cetane number, which indicates good ignitability, but has a high viscosity. Therefore, when only food oil is used as fuel, the injection pump and the injection pipe may be damaged.

For this reason, when food oil is used in a diesel engine, it is often mixed with heavy fuel oil A or light oil using a fuel mixing device and used as a mixed oil having a reduced viscosity. FIG. 6 shows a diesel device provided with such a fuel mixing device. In the figure, input pipelines 5 and 6 are connected to a fuel tank 2 for food oil 1 and a fuel tank 4 for heavy oil A 3, respectively.

[0004] A mixing valve 7 is provided at the outlet side of each of the input lines 5 and 6.
Is connected. An adjusting handle 8 for adjusting the opening of the mixing valve 7 is attached to the mixing valve 7. By operating the adjusting handle 8, the food oil 1 and the A heavy oil 3 flowing into the mixing valve 7 from each input line 5, 6 are mixed at a predetermined ratio, and the mixed oil 9 having a predetermined viscosity is mixed.
To be.

[0005] An output line 10 for discharging the mixed oil 9 is connected to the mixing valve 7, and a diesel engine 11 is connected to an outlet side of the output line 10. Output line 1
Above 0, a fuel supply pump 12 for sending the mixed oil 9 to the diesel engine 11 is provided. A return line 13 extending from the diesel engine 11 is connected to the output line 10 between the mixing valve 7 and the fuel supply pump 12.

In the above-described diesel device, the adjusting handle 8 is manually operated in advance, and the mixing valve 7 is adjusted to a predetermined opening. Here, the opening of the mixing valve 7 is determined in advance by a combustion test or the like in order to make the mixed oil 9 have a predetermined viscosity. By operating the fuel supply pump 12, the food oil 1 and the A heavy oil 3 flow into the mixing valve 7 and are mixed at a predetermined ratio to be a mixed oil 9 having a predetermined viscosity.

[0007] The mixed oil 9 is delivered to a diesel engine 11 through an output pipe 10 and is burned. Excess mixed oil 9 that does not contribute to combustion is returned from the diesel engine 11 to the output line 10 through the return line 13. In addition, mixed oil 9
Is periodically analyzed, and when the mixed oil 9 does not have the predetermined viscosity, the adjusting handle 8 is operated each time,
The opening of the mixing valve 7 is adjusted.

[0008]

However, in such a conventional diesel device, the mixing valve 7 always has a fixed opening after the adjustment handle 8 is adjusted. , The viscosity of the mixed oil 9 changes, and the combustion efficiency may decrease.

Further, since the change in the viscosity of the mixed oil 9 can be known only at the time of the analysis that is performed periodically, if the property of the food oil 1 changes immediately after the analysis, the mixed oil 9 having a different viscosity from the predetermined viscosity may be obtained. However, there is a problem that the fuel is sent to the diesel engine 11 for a long time.

In particular, when the viscosity of the mixed oil 9 becomes high, there is a possibility that the fuel high-pressure pipe of the diesel engine 11 or the like may be damaged. Furthermore, the adjustment of the mixing ratio of the mixed oil 9 has to be performed by an operator by operating the adjustment handle 8, and there is a problem that it is difficult to adjust the viscosity with high accuracy.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. A fuel mixing apparatus which can always make a mixed oil obtained by mixing different fuels have a predetermined viscosity, and a fuel mixing apparatus having the same It is intended to provide a diesel device provided with the same.

[0012]

According to a first aspect of the present invention, there is provided a fuel mixing device, wherein two input pipes through which different fuels flow, respectively, and the input pipes are connected to the input pipes and flow from the input pipes. In a fuel mixing device comprising a mixing valve for mixing each fuel, and an output pipe connected to the mixing valve and flowing the mixed fuel, a viscosity of the mixed fuel is detected, and the detected viscosity is And a valve opening adjusting means for inputting the viscosity, obtaining the opening of the mixing valve from the viscosity, and adjusting the mixing valve to the obtained opening. It is characterized by the following.

According to a second aspect of the present invention, in the fuel mixing apparatus according to the first aspect, the viscosity detecting means is provided in the output line and detects a viscosity from a fluid pressure of the mixed fuel. The valve opening adjusting means obtains an opening of the mixing valve from a deviation between the viscosity output from the viscosity detecting unit and a preset target viscosity, and outputs the obtained opening to the outside. It is characterized by comprising a viscosity control unit, and an opening adjustment unit for inputting the opening obtained by the viscosity control unit and adjusting the opening of the mixing valve.

According to a third aspect of the present invention, in the fuel mixing apparatus according to the second aspect, the mixing valve is a diaphragm valve type three-way valve, and the opening adjustment section is connected to the diaphragm valve type three-way valve. And an electropneumatic positioner for sending air at a predetermined pressure to the diaphragm valve type three-way valve. The diesel device of the fourth aspect is the first aspect of the invention.
A fuel mixing device according to any one of claims 3 to 3,
A fuel tank is connected to an inflow side of each of the input lines, and a diesel engine is connected to an outflow side of the output line.

(Function) In the fuel mixing device according to claim 1, 2
Each fuel circulated through the input pipes is mixed at a predetermined ratio by a mixing valve to form a mixed fuel, which is sent to the output pipe. At this time, the measuring means detects the viscosity of the mixed fuel,
The detected viscosity is output to the outside.

The valve opening adjusting means receives the viscosity output from the measuring means and adjusts the opening of the mixing valve so that the mixed fuel has a predetermined viscosity. Therefore, even when the properties of each fuel change, the viscosity of the mixed fuel is automatically adjusted, and each fuel is always mixed with the mixed fuel having the optimum viscosity for combustion. In the fuel mixing device according to the second aspect, the viscosity detector disposed in the output line obtains the viscosity from the fluid pressure of the mixed fuel flowing through the output line, and outputs the obtained viscosity to the outside.

The viscosity controller receives the viscosity output from the viscosity detector and calculates a deviation between the input viscosity and the target viscosity. Further, the viscosity control unit obtains the opening of the mixing valve for reducing the deviation to zero, and outputs the obtained opening to the outside. The opening adjuster inputs the opening of the mixing valve output from the viscosity controller and adjusts the opening of the mixing valve.

In the fuel mixing device according to the third aspect, the opening degree of the diaphragm valve type three-way valve is controlled by the pressure of the air sent from the electropneumatic positioner, so that the viscosity of the mixed fuel can be easily determined with a simple mechanism. Is adjusted. In the diesel device according to the fourth aspect, the fuel tank for storing each fuel is connected to each input line, and the diesel engine is connected to the output line, so that the mixed fuel having the optimum viscosity for combustion is supplied to the diesel engine. .

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment (corresponding to claims 1 to 4) of a fuel mixing device of the present invention and a diesel device provided with this fuel mixing device. Here, in the figure, the region surrounded by the two-dot chain line is
3 shows a fuel mixing device.

In the figure, a fuel tank 2 for a cooking oil 21 is shown.
Input pipes 29 and 31 are connected to the fuel tanks 27 for the 3 and A heavy oil 25, respectively. Each input line 2
The input ports 35a and 35b of the three-way valve portion 35 of the diaphragm valve type three-way valve 33 are connected to the outlet sides of the valves 9 and 31, respectively. The diaphragm valve type three-way valve 33 has a built-in diaphragm actuator 37, and the diaphragm actuator 37 and the three-way valve unit 35 are connected to each other via a valve stem 39.

The diaphragm actuator 37 is connected to an output port 43a of an electropneumatic positioner 43 via an air inlet pipe 41a. The input port 43b of the electropneumatic positioner 43 is connected to the air tank 4 via an air inlet pipe 41b.
5 is connected. Output port 35c of three-way valve unit 35
Is connected to an output line 49 for discharging a mixed oil 47 (corresponding to a mixed fuel), and a diesel engine 51 is connected to an outflow side of the output line 49.

A fuel supply pump 53 for sending the mixed oil 47 mixed by the three-way valve section 35 to the diesel engine 51 is provided on the output pipe 49. Further, a return line 55 extending from the diesel engine 51 is provided between the three-way valve portion 35 and the fuel supply pump 53 in the output line 49.
Is connected. Further, a viscosity controller 57 (corresponding to a viscosity detection unit) is provided in the output pipe 49 between the fuel supply pump 53 and the diesel engine 51.

The viscosity controller 57 is connected to a viscosity controller control panel 61 (corresponding to a viscosity controller) via a signal line 59. The viscosity controller 57
As shown in FIG. 2, there is provided a branch pipe 63 that branches from the output pipe 49 and returns to the output pipe 49 again. On the branch pipe 63, a small pump 65 and a SUS capillary tube 67 are provided. Have been.

The branch pipe 63 is connected to the low pressure side detection port 69a and the high pressure side detection port 69b of the differential pressure transmitter 69 at the inlet side 63a and the outlet side 63b of the capillary tube 67. The differential pressure transmitter 69 detects a differential pressure between the low pressure side detection port 69a and the high pressure side detection port 69b of the mixed oil 47 flowing through the capillary tube 67, converts the detected differential pressure into an electric signal, and connects the signal line 59. It has a function of outputting to the viscosity controller control panel 61 via the controller.

Generally, when the flow of the mixed oil 47 in the capillary tube 67 is laminar, it is known that the differential pressure generated at both ends of the capillary tube 67 is directly proportional to the fluid viscosity. Therefore, the viscosity controller 5
7, the viscosity of the mixed oil 47 can be obtained from the differential pressure.

As shown in FIG. 3, the viscosity controller 57 determines that the mixing ratio of the food oil 21 in the mixed oil 47 is 10%.
0% (viscosity 26 cst), the output current is 4
mA, and the mixing ratio of the food oil 21 in the mixed oil 47 is 0%.
(Viscosity is 2.6 cst), that is, the output current is adjusted to 20 mA when the mixing ratio of the A heavy oil 25 is 100%.

In this embodiment, the target viscosity of the mixed oil 47 is set to 14.5 cst, and the mixing ratio of the food oil 21 at the target viscosity is about 80% when the temperature is 50 ° C. Have been. As shown in FIG. 1, the input section 43 c of the electropneumatic positioner 43 is connected to the viscosity controller control panel 61 via a signal line 71.

The viscosity controller control panel 61 has a function of calculating a deviation between the viscosity input from the viscosity controller 57 and the target viscosity. Further, the viscosity controller control panel 61 obtains an output current (4 to 20 mA) to be output to the electropneumatic positioner 43 from a deviation from the target viscosity by using a process control method generally called PID control. 43 is provided.

The target viscosity is stored in the viscosity controller control panel 61 in advance. Electro-pneumatic positioner 43
As shown in FIG. 4, based on the current (4 to 20 mA) input from the viscosity controller control panel 61, the diaphragm actuator 37 is supplied with 0.2 to 1.0 kg / cm.
It is adjusted to output air at a pressure of ² . Here, the diaphragm valve type three-way valve 33 is connected to the electropneumatic positioner 4.
When the air pressure delivered from 3 is 0.2 kg / cm ² , the opening of the three-way valve portion 35 is set to 0%, and when the air pressure is 1.0 kg / cm ² , the opening of the three-way valve portion 35 is reduced. The opening is adjusted to 100%.

In this embodiment, the three-way valve 35
Means that when the opening is 0%, the mixing ratio of the cooking oil 21 is 0%
When the opening degree is 100%, the mixing ratio of the food oil 21 is set to 100%. In the diesel device provided with the above-described fuel mixing device, the three-way valve portion 35 is controlled to convert the food oil 21 and the A heavy oil 25 into a mixed oil 47 having a predetermined viscosity, as described below.

That is, by operating the fuel supply pump 53 as shown in FIG.
The heavy oil 25 passes through the input lines 29 and 31 and passes through the three-way valve portion 35.
Flowed into. Mixed oil 4 mixed by three-way valve 35
7 is delivered to the diesel engine 51 through the output line 49 and the viscosity controller 57, and is burned.

Excess mixed oil 47 that does not contribute to combustion passes through return line 55 from diesel engine 51 to output line 4.
It is returned to 9. The viscosity controller 57 detects the viscosity of the mixed oil 47 as a differential pressure, converts this differential pressure into a current value,
Output to the viscosity controller control panel 61. The viscosity controller control panel 61 calculates a deviation between the viscosity (current value of 4 to 20 mA) input from the viscosity controller 57 and the target viscosity.

Then, the viscosity controller control panel 61
By PID control, an output current to be output to the electropneumatic positioner 43 in order to reduce the deviation from the target viscosity to zero is obtained, and this current is output to the electropneumatic positioner 43. The electropneumatic positioner 43 sends out air having a pressure corresponding to the input current value from the output port 43a.

The diaphragm actuator 37 receives the pressure of the air sent from the output port 43a of the electropneumatic positioner 43, presses the valve stem 39 toward the three-way valve portion 35, and moves the valve stem 39 to move the three-way valve. The opening of the portion 35 is adjusted. And the input lines 29, 31
The mixing ratio of the food oil 21 and the A-heavy oil 25 flowing from the oil is adjusted to make the mixed oil 47 of a predetermined viscosity.

FIG. 5 shows a flowchart of the control performed by the viscosity controller control panel 61. In this flowchart, first, in step S1, the viscosity controller control panel 61 inputs the viscosity of the mixed oil 47 flowing through the output pipe 49 from the viscosity controller 57 as a current of 4 to 20 mA.

Next, in step S2, the viscosity controller control panel 61 determines the viscosity input in step S1 and
The deviation from the target viscosity of the mixed oil 47 is determined. Next, in step S3, it is determined whether the deviation is zero. When the deviation is zero, it is determined that the viscosity of the mixed oil 47 is the target viscosity, and the control of the viscosity controller control panel 61 proceeds to step S1 again.

If the deviation is not zero, the control of the viscosity controller control panel 61 proceeds to step S4. In step S4, in order to set the viscosity of the mixed oil 47 to the target viscosity, the viscosity controller control panel 61 outputs the output current to be output to the electropneumatic positioner 43 for setting the three-way valve portion 35 to a predetermined opening by PID control. Ask for.

Next, in step S5, the output current (4 to 20 mA) obtained in step S4 is applied to the electropneumatic positioner 43.
Output to Then, the control of the viscosity controller control panel 61 returns to step S1. In the mixing device configured as described above, the viscosity controller 57 is provided in the output pipe 49, and the viscosity of the mixed oil 47 is adjusted by the mixed oil 47 flowing through the capillary tube 67 of the viscosity controller 57.
Is detected as a differential pressure between the inlet side 63a and the outlet side 63b of
The deviation between the viscosity and the target viscosity was obtained by the viscosity controller control panel 61, and the opening of the diaphragm valve type three-way valve 33 was adjusted so as to make this deviation zero.
The viscosity of the mixed oil 47 can be automatically adjusted to a predetermined value even when the properties of the mixed oil 47 change, and the food oil 21 and the A heavy oil 25 are always mixed with the mixed oil 47 having the optimum viscosity for combustion. can do.

Further, the diaphragm valve type three-way valve 33 is used for mixing the food oil 21 and the A heavy oil 25, and the opening degree of the diaphragm valve type three-way valve 33 is controlled using the electro-pneumatic positioner 43. Thus, the viscosity of the mixed oil 47 can be easily adjusted. Then, the fuel tanks 23 and 27 for storing the food oil 21 and the A heavy oil 25 are connected to each input line 2.
9, 31 and the diesel engine 51 is connected to the output line 49.
, The oil mixture 47 having the optimum viscosity for combustion can be supplied to the diesel engine 51.

[0040]

According to the fuel mixing device of the first aspect, a viscosity detecting means for detecting the viscosity of the mixed fuel discharged from the mixing valve, and the opening of the mixing valve is adjusted by receiving the viscosity outputted from the viscosity detecting means. Valve opening adjustment means that automatically adjusts the viscosity of the mixed fuel to be constant even if the properties of each fuel change, making each fuel always optimal for combustion. It can be mixed with a mixed fuel having a high viscosity.

According to a second aspect of the present invention, the viscosity is obtained from the fluid pressure of the mixed fuel flowing through the output line by the viscosity detecting section provided in the output line, and the obtained viscosity and the target are determined by the viscosity control section. The opening of the control valve for reducing the deviation from the viscosity to zero was obtained, and the opening of the mixing valve was adjusted by the opening adjusting unit. Viscosity can be maintained.

In the fuel mixing device according to the third aspect, the diaphragm valve type three-way valve is used as the mixing valve, and the opening degree of the diaphragm valve type three-way valve is controlled using the electropneumatic positioner. In addition, the viscosity of the mixed fuel can be adjusted. In the diesel device according to the fourth aspect, the fuel tank for storing each fuel is connected to each input line, and the diesel engine is connected to the output line, so that the mixed fuel having the optimum viscosity for combustion can be supplied to the diesel engine. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a fuel mixing device and a diesel device provided with the fuel mixing device of the present invention.

FIG. 2 is a configuration diagram showing details of a viscosity controller.

FIG. 3 is a graph showing a relationship between a viscosity of a mixed oil and an output current of a viscosity controller.

FIG. 4 is a graph showing a relationship between an input current of an electropneumatic positioner and an output air pressure.

FIG. 5 is a flowchart showing control performed by a viscosity controller control panel.

FIG. 6 is a configuration diagram showing a diesel device provided with a conventional fuel mixing device.

[Explanation of symbols]

 Reference Signs List 21 food oil 23 fuel tank 25 A heavy oil 27 fuel tank 29, 31 input line 33 diaphragm valve type three-way valve 35 three-way valve part 35a, 35b input port 35c output port 37 diaphragm actuator 39 valve stem 41a, 41b air inflow pipe 43 electric Empty positioner 43a Output port 43b Input port 43c Input section 45 Air tank 47 Blended oil (Mixed fuel) 49 Output line 51 Diesel engine 53 Fuel supply pump 55 Return line 57 Viscosity controller (viscosity detection section) 59 Signal line 61 Viscosity controller Control panel (viscosity control unit) 63 Branch pipe 63a Inlet side 63b Outlet side 65 Small pump 67 Capillary tube 69 Differential pressure transmitter 69a Low pressure side detection port 69b High pressure side detection port 71 Signal line

Claims (4)

[Claims] 1. A fuel supply system comprising: two input pipes through which different fuels are respectively circulated; a mixing valve connected to each of the input pipes to mix each of the fuels flowing from the input pipes; A fuel mixing device comprising: an output pipe connected to the fuel tank; and a viscosity detecting unit configured to detect a viscosity of the mixed fuel and output the detected viscosity to the outside. A fuel mixing device comprising: a valve opening adjusting means for inputting an input, obtaining the opening of the mixing valve from the viscosity, and adjusting the mixing valve to the obtained opening. 2. The fuel mixing device according to claim 1, wherein the viscosity detecting means includes a viscosity detecting unit disposed in the output pipe line and configured to detect a viscosity from a fluid pressure of the mixed fuel. Adjusting means for determining an opening degree of the mixing valve from a deviation between the viscosity output from the viscosity detecting section and a preset target viscosity, and outputting the determined opening degree to the outside; a viscosity control section; A fuel mixing device, comprising: an opening adjustment unit that inputs an opening determined by a control unit and adjusts an opening of the mixing valve. 3. The fuel mixing device according to claim 2, wherein the mixing valve is a diaphragm valve type three-way valve, and the opening adjustment unit is connected to the diaphragm valve type three-way valve, and the diaphragm valve type three-way valve is provided. A fuel mixing device, which is an electropneumatic positioner that sends air at a predetermined pressure to a valve. 4. The fuel mixing device according to claim 1, wherein a fuel tank is connected to an inflow side of each of the input lines, and a fuel tank is connected to an outflow side of the output line. A diesel device comprising a diesel engine to be used.