JPS5892722A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To enable a stable combustion condition with little contaminats centained in the exhaust gas to be achieved even at low fuel combustion condition by an arrangement wherein solenoid valves for water supply line are opened and closed in response to the pressure change-over operations of a fuel supply pump. CONSTITUTION:The fuel oil supplied from a fuel oil tank 1 through a constant level means 2 and an emulsification tank 3 into a fuel pump 8 is pressurized by the pump 8 and is atomized by a burner 12 so as to be burnt. A water supply line includes a first solenoid valve 6 and a second solenoid valve 7. When the load of a water boiler 11 reduces, its combustion setting is changed over to low combustion value. At that time, the delivery pressure of the fuel pump 8 drops, and as a result, a pressure switch 9 is turned OFF to close the solenoid valve 7. Thus, the amount of water supplied from a water tank 5 into the emulsification of water added to the fuel to be emulsified at a proper value. By this arrangement, a stable combustion condition with little contaminants contained in the exhaust gas can be ensured even at low fuel combustion condition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and more specifically, the amount of water added in accordance with the liK combustion JIK, which switches the combustion amount of a combustion device that emulsifies and burns oil fuel such as kerosene and water. The amount of water was also adjusted so that a constant amount of water was always added to the oil fuel.

So-called emulsion combustion, in which water is added to oil fuel to emulsify it and then burn it, is well known as a combustion method for reducing soot and NOx in combustion exhaust gas, and has been experimentally applied to large boilers. This is said to improve combustibility due to re-atomization of the fuel caused by water with different boiling point and a during combustion, but within a certain range of added water, exhaust gas Although there was a tendency for purification, when the amount of water added was larger than necessary, values such as co/co2 tended to increase. Therefore, in a combustion device that can save combustion amount, although it shows good combustibility when the amount of combustion is high, when the amount of combustion is low, the amount of water in the emulsion carbon fuel increases more than necessary, resulting in poor combustibility.

The present invention was developed in consideration of these conventional drawbacks, and the main point of the present invention is to adjust the amount of water added by opening and closing one side of the solenoid valve provided in the line from the water tank when adjusting the amount of combustion. This will be specifically explained below based on an example.

The figure shows one embodiment of the present invention, where 1 is a fuel tank for storing oil fuel such as kerosene, 2 is a constant oil level device that adjusts the liquid level of oil fuel sent from fuel tank 1, and 3 is an emulsifying tank. An ultrasonic emulsifying device 4 is installed in the container so that its tip has a constant depth. In addition to oil fuel piping, water piping from a water supply tank 5 is connected to the emulsification tank 3, and this water piping is divided into two systems at the outlet of the water tank 5.Each water supply system has a water supply system. A first solenoid valve 6 and a second solenoid valve 7 are provided, and the first 'vt solenoid valve 6 is connected to a flame detection device (-
The second electromagnetic valve 7 is opened and closed by a pressure switch 9 that detects the discharge pressure of the fuel supply pump 8. 10 is a pipe that supplies the discharge pressure of the fuel supply pump 8 to the pressure switch. Numeral 11 is a hot water boiler, and 12 is a nine burner housed within the hot water boiler.

Next, the operation of the present invention will be explained.At the start of zero operation, the oil fuel that passes from the oil fuel tank 1 through the constant oil level device 2 and the emulsification tank 3 is pressurized by the fuel pump 8 and is injected and burned in the burner 12. When a flame detection device (not shown) detects that a stable flame has been formed on the burner 12, the signal causes the first solenoid valve 6 provided in the water supply system to open. At the same time as water flows into the emulsifying tank 3, the ultrasonic emulsifying device 4 is activated, and emulsified fuel is formed in the emulsifying tank 3.
The fuel sent to the engine also gradually becomes emulsified fuel, creating a combustion state with fewer pollutants in the exhaust gas.

When the combustion amount set at this time is in a high combustion state, K is
Since the discharge pressure of the fuel pump 8 increases, the pressure piping 10
The pressure causes the pressure switch 9 to turn on. Therefore, the second electromagnetic valve 7 provided in the water supply system is opened, and the amount of water sent to the emulsification tank 3 increases, resulting in an appropriate amount of water addition.

When the load on the one-way hot water boiler 11 becomes small, the combustion amount is switched to a low combustion amount, but at this time, the discharge pressure of the fuel pump 8 decreases, so the pressure switch 9 is turned OFF.
Therefore, in order to close the electromagnetic valve 7, the amount of water sent from the water tank 5 to the emulsifying tank 3 is throttled, and the amount of water added to the emulsified fuel becomes an appropriate amount.

Therefore, even when the combustion amount is low, a stable combustion state with few pollutants in the exhaust gas can be obtained.

In the present invention, a pressure switch 9 is used to open and close the electromagnetic valve 7 of the water supply system according to the discharge pressure of the fuel pump 8. However, the present invention is not limited to providing a pressure switch; At that time, the solenoid valves may be opened and closed at the same time using the fuel quantity selector switch.Also, the water supply system should be one system, and that system should include a solenoid valve for closing and a solenoid valve dedicated for switching the strength/weakness. For example, solenoid valves, which are fully open during strong twisting and dark and half open during weak combustion, may be connected in series, and a solenoid valve dedicated to switching between strengths and weaknesses may be switched in the above-described manner.

As explained above, according to the present invention, even if the emulsified fuel is used and combustion is performed by switching the intensity of the combustion in a combustion device, the amount of water contained in the emulsified fuel can be kept within a predetermined range 11, and a good combustion state can always be maintained. It is something.

l... Oil fuel tank, 2... Constant oil level device, 3...
...Emulsification tank, 4.Emulsification device, 5.Water tank.

6...Solenoid valve 1.7...Solenoid valve 2゜8...Fuel pump, 9...Pressure switch, 12...Burner.

Claims (1)

[Claims] In a fuel w4 device that emulsifies and burns oil fuel such as kerosene and water, if there are two water supply systems from the water tank, then a solenoid valve is installed in each water supply system. A liquid fuel combustion device characterized in that the device opens and closes in conjunction with the pressure switching operation of a supply pump.