JPS595176Y2 - Emulsified fuel supply device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of an emulsified fuel supply device.

Figure 1 shows an example of a conventional system of this kind, which supplies emulsified fuel (stirred fuel and water to form an emulsion) to a diesel engine for the purpose of improving diesel engine combustion and reducing NOx. Ta.

In this conventional example, reference numeral 1 indicates a water tank, 2 indicates a fuel tank, 3 indicates a pump, and 20 indicates a flow control valve.

Reference number 4 is a mixer, which is a device that emulsifies fuel and water by increasing the pressure using, for example, a pump and spraying the fuel and water at high pressure from an orifice.

Reference number 5 is a heater that heats the emulsified fuel so that the viscosity of the emulsified fuel reaches an appropriate value in order to maintain good combustion in the Diedel engine.

Reference number 6 is the fuel injection pump of the diesel engine.

Reference numeral 7 is a pressure regulating valve for maintaining the pressure of the emulsified fuel supplied to the fuel injection pump above a certain level.

Reference number 8 is a return oil pipe for returning excess emulsified fuel supplied to the engine to the mixer inlet for circulation.

The purpose of this circulation is to reduce the load on the easel engine.
In order to keep the temperature of the emulsified fuel supplied to the fuel injection pump almost constant, and to prevent the minute water droplets in the emulsified fuel from condensing and separating, the emulsified fuel made by the mixer is quickly supplied to the easel engine. It's for a reason.

In such conventional examples, when high viscosity oil is used,
In order to maintain good combustion, it is also necessary to raise the temperature of the emulsified fuel at the engine inlet to 100° C. or higher.

However, since the pressure is reduced after passing through the pressure regulating valve, if the temperature of the emulsified fuel there is higher than the evaporation temperature of water, the water will evaporate and not only will the emulsion state of the emulsified oil be destroyed, but also the steam will cause a paper lock phenomenon. This may cause damage to the mixer 4 pump.

Therefore, there was a drawback that the temperature of the emulsified fuel had to be kept below a temperature at which water does not evaporate at the expense of deteriorating combustion.

Of course, it is possible to increase the height of the fuel tank 1 and apply static pressure to the entire emulsified fuel supply system to prevent water from evaporating, but it is difficult to adopt this method in reality due to space constraints.

Therefore, in reality, high viscosity fuel cannot be used in conventional fuel supply systems.

It is an object of the present invention to eliminate this drawback of the conventional device, and the present invention is characterized in that a cooler is provided between the fuel injection pump and the pressure regulating valve of the diesel engine.

The present invention will be described in detail below with reference to FIG.

The arrangement in FIG. 2 is the same as the conventional example shown in FIG. 1 except for the cooler 9, so the details of the overlapping configuration will be omitted.

The cooler 9 is disposed between the fuel injection pump or pressure spray burner 6 of the diesel engine and a pressure regulating valve or an orifice 7 having an equivalent effect, and cools the emulsified fuel to a temperature of, for example, 100°C. It lowers the temperature below ℃.

By doing this, the water evaporates in the return oil pipe of the emulsified fuel, the emulsion state is destroyed, and the water does not separate.

It also prevents water from evaporating and forming paper locks that can damage the mixer pump.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional device, and FIG. 2 is a similar diagram of the device of the present invention. 1...Water tank, 2...Fuel tank,
3...Pump, 4...Mixer, 5...
... Heater, 6 ... Easel engine fuel injection pump or pressure injection burner, 7 ... Hydraulic valve or orifice, 8 ... Return oil pipe, 9 ...・
...Cooler, 20...Flow control valve.

Claims (1)

[Scope of utility model registration request] A device that supplies heated emulsified fuel to the fuel injection pump or pressure spray burner of a diesel engine and returns excess emulsified fuel to the inlet of the mixer through a pressure regulating valve or an orifice having an equivalent effect. An emulsified fuel supply device characterized in that a cooler is provided between a type burner and a pressure regulating valve or orifice.