JPS6233483B2 - - Google Patents

Description

[Detailed Description of the Invention] An object of the present invention is to provide a liquid fuel combustor that can change the calorific value steplessly and continuously with a simple configuration and can perform high-quality combustion within that range. It is something to do.

Conventional liquid fuel combustion equipment generally burns with a constant calorific value, and even if the calorific value is changed, the limit is two-stage high/low, or three-stage high/medium/weak, making it difficult to fine-tune the calorific value. It was difficult to operate. This was mainly due to mechanical constraints. In other words, in conventional products, the air supply system and fuel supply system to the burner were configured independently, so in order to maintain the appropriate ratio of supply amounts from the two systems, it was necessary to adjust and set each separately. It was hot. In order to change the amount of heat generated, it is necessary to change each of the two systems separately while maintaining the appropriate ratio, and in order to make it possible to link them, complicated configurations, control, and higher prices are required. I needed it.

The present invention solves the above problems, and one embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a flame opening, 2 is an inner case made of a good heat conductor such as aluminum die-casting and forms a mixing chamber 4, and 3 is a heat insulating material made of a heat-resistant material. Liquid fuel is passed through an oil supply pipe 5 connected to a tank (not shown) to a sealed oil level device 6.
The oil is introduced into the bubble pump 7, and a constant oil level is formed inside the bubble pump 7. 8 is a fuel dripping nozzle. On the other hand, air is sent from a blower pipe 9 connected to a blower (not shown), and is divided into air to be sent to the mixing chamber 4 and air to the bubble pump 7 at an air branch 9a. 10 and is introduced from air supply ports 12a and 12b. The other branched air is introduced into the bubble pump 7 through the pump air supply pipe 11. 11a is an air blowing nozzle of the bubble pump 7, which is immersed below the oil level. Note that this air blowing nozzle 7
The inner diameter of the tube is approximately determined depending on the intended discharge amount, but in this example, 1 to 4 mm was appropriate. Reference numeral 13 represents an air flow rate regulator for adjusting the total amount of air, and reference numeral 14 represents a heater for preheating or keeping the vaporization surface 2a at a constant temperature, such as a sheathed heater or a temperature self-control type heater. Reference numeral 15 denotes a pressure regulating pipe for maintaining a constant oil level of the fuel in the bubble pump 7, and communicates the mixing chamber 4 with the air portion of the constant oil level device 6. 16 is a combustion flame.

Next, the operation will be explained. First, at the same time as the start, the vaporizing surface 2a is heated by the heater 14, and as soon as the temperature reaches an appropriate temperature (240 to 300° C.), air is supplied from the blower. The air branched at a constant ratio by the air branching portion 9a is sent to the mixing chamber 4 on one side and the bubble pump 7 on the other side. The air sent to the bubble pump 7 is blown out from the air blowing nozzle 11a, forms bubbles, carries fuel on the surface of the bubbles, and is dripped from the fuel dripping nozzle 8 onto the vaporizing surface 2a. The dropped fuel is instantaneously vaporized on the vaporization surface 2a that has reached a sufficiently high temperature, mixed with air supplied from the air supply ports 12a and 12b, and transported to the flame port 1, where it is heated to a suitable igniter (not shown). However, if it is ignited by, for example, a high-pressure discharge spark, etc., a combustion flame 16 is instantaneously formed. During steady combustion, the heat conducted from the combustion flame 16 through the inner case 2 is used as the main heat for fuel vaporization, and it is sufficient for the preheater 14 to be turned off or only slightly energized. The amount of combustion can be controlled by adjusting the air flow rate regulator 13. That is, by operating this air flow rate regulator 13, the amount of air supplied to the bubble pump 7 changes, so the amount of fuel supplied to the vaporization surface 2a is varied accordingly, and at this time, the amount of fuel supplied to the mixing chamber 4 is changed. Since the amount of air supplied is also varied proportionally, the amount of combustion can be varied.

In FIG. 2, a solid line A shows the change in the calorific value (amount of oil sent to the vaporizing section 2a) with respect to the amount of air supplied to the bubble pump 7, and a broken line B shows the excess air ratio at that time.
At this time, the air overload factor is a value when the theoretically required air amount for the combustion amount is set to 1. From this figure, it can be seen that the calorific value changes almost linearly from 1830 to 3850 Kcal/hr for the air supply amount range of 0.05 to 0.10 N/min, and the excess air ratio is almost constant during that range. In addition, in this example, combustion is performed at an excess air ratio of 1.2, so the ratio of the amount of air supplied to the mixing chamber 4 and the amount of air supplied to the bubble pump 7 is approximately 800:1, which is due to the air branch. This can be easily adjusted by adjusting the branch opening ratio in the portion 9a. Then, in the same department,
Providing an orifice with a variable opening area, a damper, etc. is useful for finely adjusting the excess air ratio. Further, the vaporizing section 2a is not limited to this embodiment, and a rotary type atomizing/vaporizing device or the like can be used, and developments from this embodiment can be made in a wide variety of ways.

As described above, according to the present invention, it is possible to vary the calorific value over a wide range, and the excess air ratio remains approximately constant within that range, so it is possible to achieve high-quality combustion at all points. This has brought about great effects in that it is possible to do this with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a liquid fuel combustion device according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram of the same liquid fuel combustion device. 2a... Vaporization section, 4... Mixing chamber, 7... Bubble pump, 13... Air flow rate regulator (adjustment means).

Claims (1)

[Claims] 1 comprising a fuel vaporization section, a mixing chamber that mixes the fuel vaporized in the vaporization section with air supplied from an air supply section, and a flame port section that burns the air-fuel mixture mixed in the mixing chamber, and The air supply section is provided with an adjustment means for changing the air supply amount and a branch section on the downstream side, one of which is connected to the mixing chamber, and the other branch is connected to keep the air at a constant oil flow rate. A liquid fuel combustion device that includes a bubble pump that introduces the liquid fuel into the liquid fuel, and supplies the liquid fuel to the vaporization section using the bubble pump.