JPH0320540Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a fuel oil supply system for an engine, and in particular, for example, to heat and supply heavy oil (low quality heavy oil) to a diesel engine. This invention relates to a moisture separation device.

Prior Art FIG. 3 shows a fuel oil supply system diagram of an engine fuel supply system, which is the background of this invention. In the figure, 1 is a fuel oil pump, 2 is a fuel oil heater, 3 is a vapor separator, and 4 is a pressure regulating valve, and these devices are appropriately connected by fuel oil pipes to circulate the fuel oil supply to the diesel engine 7. The fuel oil tank 5 supplies an amount of fuel oil consumed within the engine to the fuel oil supply circulation circuit a via a fuel oil supply pipe 6.

In recent years, diesel engines that use high-viscosity, low-quality heavy oil as fuel have been developed, but diesel engines7
In order to improve the combustion in the cylinder, it is necessary to atomize the fuel oil b injected into the cylinder, so the fuel oil is heated by the fuel oil heater 2 to have a viscosity suitable for fuel injection. The fuel is then heated and supplied to the diesel engine 7. Excess fuel oil that has not been consumed by the diesel engine 7 is returned to the vapor separator 3 through the pressure regulating valve 4 and temporarily stored for the next supply.

By the way, conventionally, when such fuel oil has a high viscosity, it is necessary to heat the fuel oil to a viscosity that allows good fuel injection, but in such cases, the temperature of the heated fuel oil For example,
Exceeds 100℃.

In this case, the portion of the fuel oil heated to a temperature exceeding 100° C. that is not consumed by the diesel engine 7 is returned to the vapor separator 3 as described above while remaining at a high temperature.

Problems with the Prior Art However, in the case of such a fuel supply system, the vapor separator 3 is equipped with a vapor drain pipe 8 connected to the fuel oil tank 5, and the vapor separator 3 is also equipped with a vapor drain pipe 8 that is connected to the fuel oil tank 5 and is opened to the atmosphere. Air vent pipe 10
is connected, the pressure of the fuel oil returned from the pressure regulating valve 4 to the vapor separator 3 becomes atmospheric pressure,
Water contained in fuel oil evaporates (vaporization)
do. In such a case, particulate fuel oil is mixed in the water vapor. Therefore, this oil-containing steam passes through the upper part of the fuel oil tank 5 from the vapor vent pipe 8 as shown by the broken line in the figure, and is discharged into the atmosphere from the air vent pipe 10.

As a result, fuel oil is released into the atmosphere, which not only creates an extremely dangerous atmosphere that may cause a fire, but also contaminates the opening of the air vent pipe and the surrounding environment.

Purpose of the invention Therefore, the main purpose of this invention is to maintain good combustion in the engine even when relatively high viscosity fuel is used, while preventing environmental pollution caused by oil and dangers such as fire. The purpose of the present invention is to provide a fuel oil supply system for an engine.

Composition of the Device In order to achieve the above object, the main means adopted by this device is a fuel oil pump, a fuel oil heater, a vapor separator, and a fuel oil pipe that connects these devices. An engine comprising an oil supply circulation path, a fuel oil tank connected to the vapor separator via a vapor removal pipe, and a fuel oil supply pipe that supplies fuel oil from the fuel oil tank to the fuel oil supply circulation pipe. In the fuel oil supply device, the vapor extraction pipe is equipped with a vapor condensing means for condensing vapor, and the vapor condensing means receives the condensed oil water obtained by the vapor condensing means from the vapor condensing means. A drain pipe for directly leading to the bottom of the tank for recovery is installed below the connection part of the fuel oil supply pipe in the fuel oil tank, and the drain pipe is used to collect the fuel in the fuel oil tank. An opening that is open to the atmosphere is formed above the oil level.

Function For example, when water vapor and fuel oil vapor generated in a vapor separator are sent to a place equipped with vapor condensing means, this vapor is condensed (cooled) here, and the water vapor turns into water. be returned. Then, when the condensed water and oil are collected in the fuel oil tank, the water sinks to the bottom of the fuel oil tank and is drained out by the drain valve at the bottom of the fuel oil tank, while the oil is supplied again to the fuel oil tank. It is stored in a tank to be supplied to the circulation line.

Effects of the invention According to this invention, the vapor generated when fuel oil is heated is collected as a drain, so this vapor is no longer released into the atmosphere, preventing circulating pollution caused by oil and dangers such as fire. be able to.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

Embodiment FIG. 1 is a fuel oil supply system diagram of a fuel oil supply system for an engine according to an embodiment of this invention, and FIGS. 2a and 2b show different internal structures of the fuel oil tank in FIG. 1. FIG.

Note that the following example is only one specific example of this invention, and the technical scope of this invention is not limited by this example.

In FIG. 1, the fuel oil supply system for the engine includes a fuel oil supply circulation circuit a' consisting of a fuel oil pump 11, a fuel oil heater 12, a vapor separator 13, a pressure regulating valve 14, and a fuel oil pipe connecting these; A fuel oil tank 15 having an air vent pipe 20 and supplying fuel oil to the fuel oil supply circulation circuit a', and a fuel oil supply pipe 16 supplying fuel oil from this fuel oil tank to the fuel oil supply circulation circuit a'. , and a vapor removal pipe 18 that connects the fuel oil tank 15 and the vapor separator 13, and after heating the fuel oil to an appropriate temperature, supplying it to the diesel engine 17 is performed, for example, as shown in FIG. This is similar to the case of the conventional device shown in .

However, in this invention, as a characteristic component, the vapor separator 1 is as shown in the first diagram.
3 is equipped with a condenser 21. This condenser 21 condenses the vapor sent in a high temperature state from the fuel oil supply circulation circuit a' via the vapor separator 13 through means such as cooling. Here the vapor is condensed into oily water.

In addition, a drain recovery pipe 22 is connected to the condenser 21 to directly guide and recover the water and oil condensed in the condenser 21 to the bottom of the fuel oil tank 15. In this case, as shown in FIG. 2a, the vapor separator 13 (FIG. 1) and the fuel oil tank 15 are located above the fuel oil level in the fuel oil tank 15 of the drain recovery pipe 22.
(FIG. 1), a vent hole 23 (opening) open to the atmosphere is directly drilled in order to prevent the siphon effect that occurs between the two.

Next, in FIG. 2a, the drain collection pipe 22
The lower end opening 22' of the condenser 21 (see Fig. 1)
When collecting the condensed water in the fuel oil tank 15, in order to prevent it from spreading into the fuel oil c in the tank, and as shown in FIG. In order to do this, it is placed close to the bottom of the fuel oil tank 15. As a result, the condensed water is directly guided to the bottom of the fuel oil tank 15 and collected there, and is appropriately discharged to the outside of the tank by the drain valve 19 provided at the bottom of the fuel oil tank 15. Therefore,
As shown in FIG. 2a, the fuel oil supply pipe 16 is provided at a higher position than the lower end opening 22' of the drain recovery pipe 22. As shown in FIG. In other words, the drain recovery pipe 2
The lower end opening 22' of No. 2 is provided below the connection portion of the fuel oil supply pipe 16.

Note that the water containing oil condensed by the condenser 21 may not be collected into the fuel oil tank 15 but may be collected into another fuel drain tank (not shown).

Next, the function of the fuel oil supply system for the engine having such a configuration will be explained. First, in FIG. 1, since the pressure of the fuel oil pressurized by the fuel oil pump 11 is maintained by the pressure regulating valve 14, the moisture in the fuel oil is heated by the fuel oil heater 12. Although it will not evaporate even if the fuel oil is heated to a temperature exceeding 100°C as described above, if the surplus fuel oil is sent to the vapor separator 13 side via the pressure regulating valve 14, Since the pressure inside the vapor separator 13 is equal to atmospheric pressure due to the vent hole 23, the water evaporates.

Next, the vapor sent to the condenser 21 is condensed (cooled) there, and the water vapor is returned to water.
At the same time, the oil contained in this water vapor is also condensed. The condensed water and fuel oil are then collected into the fuel oil tank 15 through the drain collection pipe 22. The collected water is led to the bottom of the fuel oil tank 15 and drained from there by a drain valve 19.
On the other hand, the fuel oil is stored in the fuel oil tank 15 to be supplied to the fuel oil supply circulation circuit a' again.

However, the fuel oil supply pipe 16 is connected to the fuel oil tank 1.
5, by being provided at a position sufficiently higher than the lower end opening 22' of the drain recovery pipe 22,
Water collected in the fuel oil tank 15 does not enter this fuel oil supply pipe 16.

In the above embodiment, a vent hole is provided in the drain recovery pipe 22 introduced into the fuel oil tank 15 as a means for preventing a siphon effect occurring between the fuel oil tank 15 and the vapor separator 13. The case where 23 is provided has been explained. However, as shown in FIG. 2b, as another modification, the drain recovery pipe 22' may be provided divided into an upper drain pipe portion 24a and a lower drain pipe portion 24b. In this case, the upper drain pipe portion 24a has its lower end opening 24a' connected to the fuel oil tank 1.
It is extended so as to stop above the oil level of fuel oil c in 5. On the other hand, the lower drain pipe portion 24b
connects its upper end opening 24b' to the upper drain pipe portion 2.
4a, and protrudes from below the oil surface of the fuel oil c to above the oil surface, and fits into the lower end opening 24a' of the upper drain pipe portion 24a with an appropriate gap d (opening). It may be set as desired. Even in this case, the above-mentioned siphon effect can be prevented by the gap d.

[Brief explanation of the drawing]

Figure 1 is a fuel oil supply system diagram of a fuel oil supply system for an engine according to an embodiment of this invention, and Figures 2a and 2b show different internal structures of the fuel oil tank in Figure 1. The explanatory diagram, FIG. 3, is a system diagram of a conventional fuel oil supply system for an engine, which is the background of this invention. Explanation of symbols, a'...Fuel oil supply circulation circuit, 11
...Fuel oil pump, 12...Fuel oil heater, 13
...Vapor separator, 14...Pressure regulating valve, 15...
Fuel oil tank, 16...Fuel oil supply pipe 17...Diesel engine, 21...Condenser, 22...Drain recovery pipe, 23...Vent hole (opening), d...Gap (opening).

Claims (1)

[Scope of Claim for Utility Model Registration] A fuel oil supply circulation pipe comprising a fuel oil pump, a fuel oil heater, a vapor separator, and a fuel oil pipe connecting these devices; and the vapor separator. A fuel oil supply system for an engine comprising a fuel oil tank connected via a vapor vent pipe and a fuel oil supply pipe that supplies fuel oil from the fuel oil tank to a fuel oil supply circulation pipe, wherein the vapor vent pipe is connected to the fuel oil supply system. , is equipped with a vapor condensing means for condensing vapor, and the vapor condensing means directly guides and collects the condensed oil water obtained by the vapor condensing means from the vapor condensing means to the bottom of the fuel oil tank. A drain pipe is provided extending downward from the connection part of the fuel oil supply pipe in the fuel oil tank, and a portion of the drain pipe above the fuel oil level in the fuel oil tank is opened to the atmosphere. A fuel oil supply device for an engine formed by forming an opening with a