JP5247564B2 - Power generator - Google Patents

Description

  The present invention relates to a combustion apparatus including a fuel supply switching device for switching fuel supplied to a diesel engine.

From the viewpoint of environmental issues, efforts to recycling waste vegetable oil discharged from the biofuel and food industries and homes to a plant as a raw material as a diesel fuel has been performed (for example, Patent Document 1 see).

  When waste vegetable oil is used as diesel fuel, a cycle is formed in which carbon dioxide generated by combustion is absorbed by the plant that is the raw material for vegetable oil, so compared to when fossil fuels such as light oil and heavy oil are used as diesel fuel. Carbon dioxide emissions can be reduced. Furthermore, when the waste vegetable oil is reused as diesel fuel, the waste problem can be alleviated.

JP 2008-309153 A

  As one of the problems when using vegetable oil as diesel fuel, it has been pointed out that engine malfunction is more likely to occur than when conventional fossil fuel is used. An engine malfunction can cause engine damage in severe cases. For this reason, it has been difficult to stably operate the engine in spite of many environmental advantages in using vegetable oil as diesel fuel.

The power generator according to the present invention includes a diesel engine, a first fuel supply device that supplies a first fuel containing vegetable oil to the diesel engine, and a second fuel that supplies a second fuel containing light oil to the diesel engine. A fuel supply switching device for switching between the supply of the first fuel and the supply of the second fuel, a control device for controlling the fuel supply switching device, and an exhaust gas of the diesel engine comprising a detector for detecting a carbon monoxide concentration, wherein the control device, the after diesel engine using said first fuel predetermined time, to use always given the second fuel time controlling the selection of fuel, and is characterized by using the combustion device, which controls the switching of the fuel based on the carbon monoxide concentration of the exhaust gas detected by the detector And wherein the door.

In this power generator , the control device may control the fuel switching so that the second fuel is always used for a predetermined time before the diesel engine is stopped.

  According to the present invention, a diesel engine can be stably operated continuously even when vegetable oil is used as diesel fuel by switching from fuel containing vegetable oil to fuel containing light oil before engine malfunction or damage occurs. Became possible.

It is a figure which shows the structure of the combustion apparatus which is one Embodiment of this invention.

  Hereinafter, embodiments of the present invention completed based on the above knowledge will be described in detail with reference to examples. However, the present invention is not limited to the following examples.

  The objects, features, advantages, and ideas of the present invention will be apparent to those skilled in the art from the description of the present specification, and those skilled in the art can easily reproduce the present invention from the description of the present specification. it can. The embodiments and specific examples of the invention described below show preferred embodiments of the present invention, and are shown for illustration or explanation. It is not limited. It will be apparent to those skilled in the art that various modifications can be made based on the description of the present specification within the spirit and scope of the present invention disclosed herein.

== Combustion device ==
The combustion apparatus according to the present invention can use a fuel containing vegetable oil. However, in order to prevent engine malfunction or damage that occurs when a diesel engine is operated using a fuel containing vegetable oil, It is a combustion device that can be operated by switching to operation with fuel containing light oil before a failure occurs.

  FIG. 1 is a view showing a combustion apparatus as one embodiment of the present invention. The combustion apparatus 1 includes a diesel engine 2, a first fuel supply apparatus 3 that supplies a first fuel containing vegetable oil to the diesel engine, and a second fuel that supplies a second fuel containing light oil to the diesel engine. And a fuel switching device 5 for switching between the first fuel supply and the second fuel supply, and a control device 6 for controlling the fuel switching device.

  The diesel engine 2 is not particularly limited in terms of the number of cylinders, the displacement, the rotational speed, and the like, and can be appropriately selected by those skilled in the art in consideration of its application.

  The mutual relationship and operation of each component will be described. The first fuel supply device 3 and the second fuel supply device 4 include fuel tanks (7, 10), fuel filters (8, 11), and fuel pipes (9, 12), respectively. The first and second fuel supply devices supply the first and second fuels respectively stored in the fuel tanks (7, 10) to the diesel engine 2 via the fuel pipes (9, 12). These first and second fuel supply devices may be appropriately provided with various devices required by those skilled in the art within the range of fulfilling the function of supplying fuel to the diesel engine. However, if heating is necessary depending on the type of fuel, a heating device is provided around the fuel tanks (7, 10) and the fuel pipes (9, 12). Alternatively, a mixer or a mixing tank for mixing the fuel may be provided upstream of the fuel tank.

  The fuel switching device 5 receives the fuel pipes (9, 12) from the first fuel supply device 3 and the second fuel supply device 4, and valves (13, 14) for supplying each fuel to the diesel engine 2. have. The fuel switching device 6 switches the fuel supplied to the diesel engine 2 by opening and closing these valves. This supply fuel switching may be performed manually, but is preferably controlled automatically by the control device 6.

  For example, the control device 6 may control the fuel switching device 5 so that the diesel engine 2 always uses the second fuel for a predetermined time after using the first fuel for a predetermined time. Alternatively, the fuel switching device 5 may be controlled so that the second fuel is always used for a predetermined time before the diesel engine 2 stops. Each predetermined time is within the range where the diesel engine can be operated continuously without any malfunction or damage, taking into account the operating conditions such as the type of fuel used and its blending ratio, and the type and scale of the diesel engine. The trader can set as appropriate.

  Alternatively, a detector for detecting the carbon monoxide concentration, temperature and the like of the engine exhaust gas is installed, and the control device 6 is designed to switch the fuel supply at a certain value above or below a certain value. 5 may be controlled.

  The first fuel is a fuel containing vegetable oil, and may contain one or more other types of fuel in addition to the vegetable oil, and the content of the vegetable oil is not particularly limited. However, from the advantages of the vegetable oil as described in the prior art The vegetable oil content is preferably as high as possible. For example, it is preferably 50% or more, more preferably 70% or more, further preferably 90% or more, and most preferably 100%.

  The vegetable oil may be a single type of vegetable oil or a vegetable oil obtained by mixing a plurality of different vegetable oils. The type of vegetable oil is not limited as long as it is an oil derived from plant seeds, etc., soy oil, rapeseed oil, corn oil, sesame oil, cottonseed oil, rice oil, safflower oil, sunflower oil, grape seed oil, olive Those skilled in the art can appropriately select from well-known vegetable oils such as oil, palm oil, palm oil, and Jatropha oil. The degree of purification of these vegetable oils is not particularly limited as long as the diesel engine can be operated. Moreover, the vegetable oil to be used may be an unused clarified vegetable oil or a waste vegetable oil obtained by collecting edible vegetable oil or the like. In the case of waste vegetable oil, it is preferable to appropriately remove contaminants due to use in food processing and the like. In addition, as for the kind of fuel other than the vegetable oil contained in the first fuel, those skilled in the art can appropriately select one or more kinds of fuels that can normally operate a diesel engine, and examples thereof include heavy oil, light oil, and kerosene.

  The second fuel is a fuel containing light oil, and may contain one or more other types of fuel in addition to the light oil. The content of the light oil is not particularly limited, but the content of the light oil is included in terms of the recovery effect of the engine. The larger the ratio, the better. For example, it is preferably 50% or more, more preferably 70% or more, still more preferably 90% or more, and most preferably 100%. The type of fuel other than light oil contained in the second fuel can be normally used for operation of a diesel engine, and a person skilled in the art appropriately selects one or more types of known fuels that do not cause engine malfunction. Examples include heavy oil and kerosene, but it is preferable not to contain vegetable oil.

== Power generation device ==
The power generation device according to the present invention includes any one of the combustion devices described in the above “combustion device”. A person skilled in the art can appropriately select the configuration of the power generation device according to the purpose of use. For example, one power generation device may include a plurality of the same type of combustion devices or a plurality of different types of combustion devices. Or the electric power generating apparatus which concerns on this invention may equip other well-known combustion apparatuses together.

  The power generator of the present invention can be installed on the premises of various facilities that perform on-site power generation in addition to power generation equipment in the power generation industry. In that case, the diesel engine can be stably operated by appropriately switching between the supply of the first fuel containing waste vegetable oil obtained in the facility and the vicinity thereof and the supply of the second fuel containing light oil. Power can be generated by continuous operation. Examples of facilities that perform on-site power generation include food processing factories such as lunch centers and family restaurant chains.

  In this example, in the combustion apparatus according to the present invention, 100% jatropha oil was used as the first fuel, and 100% light oil was used as the second fuel. First, a 2 kW diesel engine was operated for a predetermined time by supplying jatropha oil at a rate of 0.65 liter / hour. And after switching the fuel to light oil and continuing the operation for 7 to 10 minutes, the combustion device was stopped. This was done twice over 2 days.

  During operation of the diesel engine, the carbon monoxide concentration of the exhaust gas and the engine speed (frequency) were recorded.

  As shown in Table 1, the carbon monoxide concentration of the exhaust gas recorded during operation of the diesel engine using Jatropha oil was 689 to 821 ppm (measured 6 times). On the other hand, the carbon monoxide concentration of the exhaust gas after switching to light oil was 502 to 508 ppm (measurement 4 times). The engine speed was 57.0 to 58.5 rpm during operation using vegetable oil, and 59.6 to 59.8 rpm during operation using light oil.

  As described above, when the operation using the vegetable oil is performed, the operation of the diesel engine is continued by switching to the light oil before the engine failure occurs, and then the diesel engine can be stably operated continuously.

DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Diesel engine 3 1st fuel supply apparatus 4 2nd fuel supply apparatus 5 Fuel supply switching apparatus 6 Control apparatus 7 Fuel tank 8 Fuel filter 9 Fuel piping 10 Fuel tank 11 Fuel filter 12 Fuel piping 13 Valve 14 Valve

Claims (2)

A diesel engine,
A first fuel supply device for supplying a first fuel containing vegetable oil to the diesel engine;
A second fuel supply device for supplying a second fuel containing light oil to the diesel engine;
A fuel supply switching device for switching between the supply of the first fuel and the supply of the second fuel;
A control device for controlling the fuel supply switching device;
And a detector for detecting a carbon monoxide concentration of the exhaust gas of the diesel engine,
The control device controls the switching of the fuel so that the second fuel is always used for a predetermined time after the diesel engine has used the first fuel for a predetermined time, and is detected by the detector. combustion device for controlling the switching of the fuel based on the carbon monoxide concentration of the exhaust gas,
A power generator characterized by using.   2. The power generation device according to claim 1, wherein the control device controls switching of the fuel so that the second fuel is always used for a predetermined time before the diesel engine is stopped.

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