JPS5818040Y2 - Control device for vaporizing oil combustor - Google Patents

Description

[Detailed explanation of the invention] This invention is a vaporization method in which oil is pumped using a pump, etc., heated with an electric heating wire to become vaporized oil, which is then jetted out of a nozzle, mixed with air by this jetting pressure, and then combusted with a burner. This invention relates to a control device for a type oil combustor.

Conventionally, this type of combustor has had the problem that as the combustor operates, carbon solids adhere to the inside of the nozzle, causing the nozzle diameter to become smaller and the amount of combustion to decrease. As one solution to this problem, it is common to include a needle-shaped frame for cleaning the nozzle as an accessory device.

Therefore, the combustor was difficult to maintain and lacked operability.

According to experiments, the amount of precipitated carbon deposits as described above is 600
It has been confirmed that it burns out when heated to temperatures around ℃.

Therefore, it is sufficient to operate the combustor while heating the nozzle portion to about 600°C.

However, in this case, only the nozzle portion reaches a very high temperature, which causes a significant problem in that the heat resistance and durability of the equipment equipped with the heater are significantly deteriorated.

The present invention was developed in consideration of the above circumstances, and aims to provide a control device for a vaporizing oil combustor that automatically removes carbon-based deposits that occur on the nozzle and reliably prevents the nozzle from clogging. .

Hereinafter, preferred embodiments of the present invention will be described in detail as illustrated in the accompanying drawings.

FIG. 1 shows a configuration diagram of a control device and a vaporizing oil combustor according to the present invention.

In FIG. 1, petroleum stored in an oil tank 1 is pumped up by a pump 2 and sent under pressure to a vaporizer 3, where it is vaporized by a vaporizer heater 4 built into the vaporizer 3.

The vaporized petroleum is ejected from the nozzle 5 toward the mixing pipe 6,
Here, it is mixed with air and burned in the burner 7.

A temperature detector 8 is attached to the vaporizer 3, and a temperature signal detected here is transmitted to a vaporizer heater temperature controller 9.

The current flowing through the vaporizer heater 4 is controlled by the operation of the temperature detector 8 and the temperature regulator 9, so that the vaporization temperature is kept constant.

On the other hand, both heaters are connected in parallel so that a control current is applied to the nozzle heater 10 attached to the nozzle 5 at the same timing as the vaporizer heater 4.

The characteristics shown in FIG. 2 are the temperature characteristics of heater control by the device of the present invention.

The horizontal axis shows time changes starting from the start of combustor operation, the vertical axis shows temperature changes, curve A shows nozzle temperature changes, and curve B shows vaporized oil temperature changes.

In FIG. 2, the period from the start of the combustor operation to 3 minutes is the carburetor preheating time, and at 3 minutes, the pump 2 is started and combustion begins.

FIG. 3 shows the current characteristics of the vaporizer heater 4 and the nozzle heater 10.

The curve C is the change in the current of the nozzle heater 10 over time, and the curved line is the change in the current in the vaporizer heater 4 over time.

As is clear from FIGS. 2 and 3, there is a large difference in heat capacity between the vaporizer heater 4 and the nozzle heater 10.
In particular, the nozzle heater 10 quickly becomes hot with a small current, but the vaporizer heater 4 has such a large heat capacity that it is almost unaffected by load fluctuations (fluctuations in the amount of oil to be vaporized).

Since the temperature detector 8 is installed at a location where it is mainly used to detect the disturbance state of the vaporizer heater, the control current to the nozzle heater 10 has a similar shape to the control current to the vaporizer heater 4 as shown in FIG. Become.

However, as vaporized petroleum is ejected, the nozzle part is air-cooled to suck in primary air, and since there is a large difference in heat capacity between the two heaters, the temperature decreases as shown by curve A during the combustion period. .

According to FIG. 2, the nozzle portion is heated to 600° C. or higher for about 90 seconds before the start of pump operation.

According to experiments, it has been confirmed that this time and temperature are sufficient values to burn off the carbon-based deposits.

A specific example of a temperature regulator that operates as described above is shown in FIG.

The temperature controller 9 is connected to a DC stabilized power source 11. Ramp signal generator 12, time proportional control circuit 13, and triac 14
includes.

The time proportional control circuit 13 receives and compares the signal a from the temperature detector 8 and the ramp signal S from the ramp signal generator 12 as shown in FIG. Outputs 14 gate signals.

The triac 14 is operated by this gate signal, and a load current as shown in C in FIG. 5 flows through the vaporizer heater 4 and nozzle heater 10.

For example, if the detected temperature is lower than the appropriate temperature, the output level of the temperature detector 8 will increase as shown in FIG. 5, and the load current to the vaporizer heater 4 and nozzle heater 10 will be controlled to be increased. , thereby keeping the temperature of the vaporizer heater 4 constant.

As described above, by connecting the vaporizer heater and nozzle heater in parallel, making the main control system a closed loop using the vaporizer heater, and appropriately selecting a nozzle heater with a small heat capacity, the main control system can be operated. It becomes possible to heat the nozzle portion to a high temperature for a short period of time without damaging the nozzle portion, and carbon-based deposits on the nozzle portion can be removed extremely effectively.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a vaporizing oil combustor and its control device, Figs. 2 and 3 are diagrams showing the temperature and current characteristics of the vaporizer heater and nozzle heater, and Fig. 4 is a diagram showing the preferred embodiment of the device of the present invention. FIG. 5 is an explanatory diagram of the operation of the apparatus shown in FIG. 4, showing one example. 1...Oil tank, 2...Pump, 3...
... vaporizer, 4... vaporizer heater, 5...
...Nozzle, 6...Mixing pipe, 7...
Burner, 8... Temperature detector, 9... Temperature regulator, 10... Nozzle heater, 11...
...DC stabilized power supply, 12...Ramp signal generator, 13...Time proportional control circuit, 14...
...triac.

Claims (1)

[Scope of utility model registration request] In a vaporizing oil combustor, oil pumped by a pump or the like is vaporized in a vaporizer, this vaporized oil is ejected from a nozzle, mixed with air, and this mixed gas is burned in a burner, the vaporizer In a control device that adjusts the temperature of a heater in the vaporizer based on a temperature signal from a temperature detector attached to the controller, a nozzle heater is attached to the tip of the nozzle, and the nozzle heater and the heater in the vaporizer are connected in parallel. A control device for a vaporizing oil combustor, characterized in that the tip of the nozzle is heated to a high temperature for a short period of time.