JPS616509A - Liquid fuel burning device - Google Patents

Abstract

PURPOSE:To obtain stable combustion by a method wherein combustion gas and a part of high temperature air are conducted to the vicinity of a nozzle by an exhaust gas retrieving pipe above a burner and the nozzle is heated to evaporate fuel. CONSTITUTION:An oil transporting pipe 7 is heated by a heater 6 when the heater 6 is conducted. In case the fuel arrives at a predetermined temperature enough to evaporate, a control circuit 10 perceives the signal of a temperature detector 11 and opens the valve of a pump 12 while the fuel evaporates on the way of flowing to a nozzle 3. The tip of the nozzle 3 is opened at the same time, the evaporated fuel is transported to a burner 4 and premixed with the air, then, the combustion is started by an ignition device 13 provided above the burner 4. A fan 9 is started simultaneously with the ignition, transports the air inbetween a main body 14 and a combustion chamber 1, then blows hot-air from the blow-off port 15 of the hot-air. When the stationary combustion is maintained, the high temperature exhaust gas and the air 8 are induced by the fan 9 from the exhaust gas retrieving pipe 5 connected to the fan 9 and passed near the nozzle. Accordingly, the fuel passing through there, is heated and evaporated, therefore, the stabilized combustion may be obtained at the stationary time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] This invention relates to a combustor that uses liquid fuel.

[Prior art and its problems and requirements]

vaporizes liquid fuel and sprays the vaporized fuel from a nozzle,
Combustors that burn atomized fuel are often used as household heaters in oil fan heaters or FF type oil heaters. The ignition method for this combustor is to heat the fuel with a heater and vaporize it.

Usually, fuel is atomized mechanically and the atomized fuel is ignited using an ignition heater. In addition, during steady combustion, if the fuel is heated and vaporized by a heater, a heat recovery plate is installed in the heater part.

There are many methods that use the heat generated by conduction to vaporize.

By the way, these home heaters have low side temperatures.

It is customary to use it especially during winter, and it is desirable that the start-up time until one ignition is short. Considering this requirement, the heater with the heat recovery plate has a large heat capacity, and not only the amount of heat required to vaporize the fuel, but also the amount of heat required to heat the heat recovery plate, and the rise time is inevitable. It has the disadvantage of being long.

Therefore, there is also a method in which the heater does not include a heat recovery plate and supplies the amount of heat required for vaporizing the fuel during steady combustion from the heater.

However, since this method does not recover heat using combustion gas, the amount of air required to heat the heater during steady combustion is high, which poses a problem in terms of energy saving.

Therefore, a method of vaporizing fuel without using a heater during steady combustion, which takes a short startup time to reach steady combustion, is to apply the flame during steady combustion directly to a heater without a heat recovery plate. is possible. However, this method also has the disadvantage that fuel vaporization at the nozzle is insufficient due to the distance between the heater and the nozzle.

[Purpose of the invention]

This invention relates to a combustor that vaporizes or atomizes liquid fuel, in which part of the combustion gas and high-temperature air is guided through an exhaust gas recovery port at the top of the burner using a blowing fan, and the exhaust gas is connected to the exhaust gas recovery port and the fan. It is characterized by achieving stable combustion by covering the nozzle area with a recovery pipe and heating it.

[Summary of the invention]

In a combustor that vaporizes or atomizes liquid fuel, this invention introduces a part of the combustion gas and high-temperature air to the vicinity of the nozzle through an exhaust gas recovery pipe above the burner, heats the area near the nozzle, and vaporizes the fuel. , is characterized by stable combustion.

〔Effect of the invention〕

According to this invention, in a combustor that vaporizes liquid fuel, an extra heat recovery plate is not required in the heater, and the heat capacity can be made small, so that the start-up time until one ignition is achieved can be extremely shortened.

The second effect is that if the heater does not have a heat recovery plate, it is not necessary to constantly heat the heater with a heater during steady combustion, but it is also necessary to heat the area around the nozzle with a heater, but the area around the nozzle is By heating with the exhaust gas recovery pipe, there is no need for a heater near the nozzle, and there is no need to constantly heat the heater, resulting in a huge energy saving.

The third effect is by warming the vicinity of the nozzle not only in combustors that vaporize liquid fuel, but also in combustors that mechanically atomize liquid fuel.

The atomization or vaporization condition improves, and it mixes well with air, reducing the unused gas components of Co+THC.

A stable combustion state can be obtained.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to one drawing.

FIG. 1 is a schematic diagram of a kerosene fan heater in accordance with this embodiment, with a portion thereof cut away. FIG. 2 is a side view thereof. The combustion chamber 1 has a heater 2. Nozzle 3, burner 4. and an exhaust gas recovery pipe 5. The heater 2 is installed above the burner 4.

A heater 6 is incorporated inside, and the oil feed pipe 7 is in contact with the heater 6. The exhaust gas recovery pipe 5 surrounds the tip of the heater 2 and the vicinity of the nozzle 3.

High temperature exhaust gas and air 8 are sucked in by a fan 9. The nozzle 3 is partially inserted into the burner 4, and a gap is left so that primary air can be sucked in from around the nozzle 3.The vaporized fuel and air are premixed.

First, when the heater 6 is energized, the oil pipe 7 is heated by the heater 6 . When the fuel reaches a set temperature sufficient for vaporization, the control circuit 10 senses the signal from the temperature sensor 11 and opens the pulp of the pump 12, allowing the fuel to flow through the nozzle 3.
vaporizes during the process. At the same time, the tip of the nozzle 3 opens, and the vaporized fuel is sent to the burner 4 and premixed with air.
Combustion is started by an ignition device 13 provided above the burner 4.

The fan 9 starts rotating at the same time as the ignition, the main body 14 and the combustion chamber 1
During this period, air is sent and hot air is blown out from the hot air outlet 15. When the combustion reaches a steady state, the high temperature exhaust gas and air 8 are sucked by the exhaust gas recovery pipe 5 connected to the fan 9 and passed near the nozzle 3.

Since the fuel passing through it is warmed and vaporized, stable combustion can be achieved even during normal operation. Further, since the heater 2 is heated by the flame 16 during steady combustion, the amount of electricity supplied to the heater 6 is extremely small, and the energy saving effect is negligible.

As another embodiment of this invention, in a combustor without a preheater that mechanically atomizes liquid fuel, the area around the nozzle is heated with high-temperature exhaust gas and air, and the fuel is sprayed or sprayed from the nozzle. The vaporization state is very good and it mixes well with air, so it is possible to reduce the amount of unused gas components such as CO and THC.

A stable combustion state can be obtained.

In addition, as another application example, the exhaust gas shown in FIGS.
FIG. 3 shows a schematic diagram of a kerosene fan heater that uses a different means for recovering high-temperature air and exhaust gas from the gas recovery pipe 5. This method utilizes the suction force generated when fuel is ejected from the nozzle 3 to move high-temperature exhaust gas and air 8 generated on the burner 4 to the nozzle 3.
Since the exhaust gas recovery pipe 5 can be relatively short and the pipe frictional resistance is small, this collection method is considered to be sufficient.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a kerosene fan heater showing a partially cut away embodiment of the present invention, FIG. 2 is a side view thereof, and FIG.
The figure is a schematic diagram of a petroleum 7 anheater showing another application example. 1... Combustion chamber 2... Heater 3... Nozzle 4... Burner 5, 5... Exhaust gas recovery pipe 6
... Heater 7 ... Oil pipe 8 ... High temperature exhaust gas and air 9 ... Fan 10 ... Control circuit 11 ... Temperature detector 12.
... Pump 13 ... Ignition device 14 ... Main body
15...Hot air outlet 16...Flame (7317) Agent Patent attorney Noriyuki Chika Figure 1 Figure 2

Claims (1)

[Claims] In a combustor that vaporizes liquid fuel and burns atomized fuel sprayed from a nozzle, the nozzle collects a portion of high-temperature combustion gas and air during steady combustion and heats it with the heat to achieve stable combustion. A liquid fuel combustion device characterized in that: