JPS6256711A - Vaporization type burning device - Google Patents

Abstract

PURPOSE:To provide a vaporization type burning device which can perform idle burning (burning without fuel) automatically at a high temp. when tar is accumulated, by stopping normal burning to perform idle turning when the ionic current value is smaller than the threshold value at which abnormal burning is caused by the accumulation of air in a vaporizing chamber. CONSTITUTION:An ionic current detecting means, which measures the ionic current value (if) at a time after a specified time has elapsed required to stabilize the flame ionic current after flame formation, is installed and a value measured by the ionic current detecting means is compared with a previously set threshold value (io) of the ionic current in abnormal burning and then it is checked whether abnormal burning has been carried out or not and if abnormal condition is determined to exist by this decision means, the device operates an idle burning means.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a vaporization combustion device that can automatically perform dry combustion at a high temperature when a large amount of tar etc. builds up in the vaporization chamber and an abnormal combustion condition occurs. It is related to.

[Conventional technology]

Conventional evaporative combustion devices include 2, for example, Japanese Patent Application Laid-Open No. 57-9871.
As shown in Publication No. 0, when kerosene vaporizes in the vaporization chamber during combustion, it gradually turns into tar due to polymerization of molecules within the vaporization temperature or minute residues (impurities), and the combustion time within the vaporization chamber increases. As time passes, a layer of tar (carbide) gradually accumulates.

If tar builds up and accumulates in the vaporization chamber, the vaporization passage will become clogged, resulting in poor combustion such as a decrease in the amount of vaporized gas and the amount of combustion. A means for dry heating is provided to remove the waste by heating it at a temperature higher than the vaporization temperature (approximately 50° C.).

The amount of tar adhesion varies greatly depending on the impurity content of the kerosene used in the residence, and the timing when dry heating is required varies depending on the combustion equipment. Traditionally, dry heating was performed at the beginning or end of the season. However, because kerosene with a high impurity content was used in residential units, there was a large amount of tar attached, so it was often necessary to dry-fire the kerosene even in the middle of the season.

[Problem that the invention seeks to solve]

However, it is difficult to visually determine the initial state of abnormal combustion, such as when a layer of tar accumulates inside the vaporization chamber and the amount of combustion decreases. Before it becomes possible to determine the proper combustion state, the engine must be operated in a state of abnormal combustion that cannot be visually determined for a long time, resulting in the generation of a lot of harmful gas and soot, causing a foul odor, and the amount of tar deposited in the vaporization chamber. There were problems such as a long time required for dry firing due to the large amount of water.

This invention was made in order to solve the above-mentioned problems, and provides a vaporization combustion system B that can automatically perform dry combustion at a high temperature when an amount of tar that causes abnormal combustion is accumulated in the vaporization chamber. It is intended to.

[Problem, No.1 means of solving it]

The evaporative combustion device according to the present invention uses a flame after the flame is formed.

The ionic current of the flame)! An ion current detection means that measures the ion current value if at that time after a predetermined period of stabilization has passed, and a comparison between if measured by this ion current detection means and a preset p1w value 10 of the ion current that causes abnormal combustion. determining means for determining whether there is an abnormality in the combustion state based on l-;
The apparatus also includes dry heating means that operates when the determination means determines that there is an abnormality.

[Effect]

In the combustion device according to the present invention, when the ion current value if measured by the ion current detection means is 2, the threshold value is 1 when tar is accumulated in the vaporization chamber and abnormal combustion is occurring.
Combustion is stopped for seeds that have been determined to have b smaller than 0, and dry firing is performed.

〔Example〕

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

In the figure, (1) is an electromagnetic pump for supplying kerosene (3) from the oil tank (2) to the vaporization chamber (4), and a +51Fi pump for raising the temperature of the vaporization chamber (4) above the vaporization temperature of kerosene. The heater (6) is an outer tube that communicates with the vaporization chamber (4), and has a nozzle hole (7) at its tip to guide the vaporized gas vaporized in the vaporization chamber (4) to the burner (8).

(9) is the ignition button for igniting the vaporized gas, α1 is the burner head where the flame αB is formed, α2 is the flame rod that connects to the DC power supply to 3 to detect the ionic current of the successful flame, αJit resistor , αS is a smoothing capacitor, a・ is a resistor that converts the ion current into a voltage signal A, +IT) is a timer to which this voltage signal A is input, and counts the time since flame formation, and a storage device 1 determination device. etc., αs is microcomputer α
dry heating means for adjusting the energization rate of the heater (5) according to the output signal C from η to make the temperature inside the vaporizing chamber (4) higher than that during combustion; (11 is the combustion amount from the microcomputer αη); This is a combustion amount adjusting means that adjusts the combustion amount by adjusting the operating speed of the electromagnetic pump (11) based on a set signal.

Next, the operation will be explained with reference to FIGS. 2 to 5.

FIG. 2 is a flowchart showing a part of the control program stored in the storage device of the microcomputer, and FIGS. 3 to 5 are diagrams showing the characteristics of the ionic current of the flame.

First, in the above-mentioned combustion device, when the operation switch shown in 2 is operated, the preheating process (2) in which the vaporization chamber (41) is heated by the heater (5) starts.The vaporization chamber (4) is heated to a predetermined temperature (about 250°C). When the combustion amount adjustment means al is reached, a signal from the microcomputer αη is inputted to the combustion amount adjusting means al.
The E-magnetic pump (1) is operated to proceed to the ignition process Qυ. In the waste feeding process 01), the kerosene (3) completely supplied to the vaporization chamber (4) by the electromagnetic pump (1) is vaporized in the vaporization chamber (4) and becomes vaporized gas, which passes through the outer tube (6) and enters the nozzle. It erupts from hole 17+ and enters burner 18), spark plug 1 (
9) causes the skin to ignite and burn.

When the flame α9 is formed, an ionic current flows between the burner head and the flame rod (13).This ionic current is converted into a voltage signal A by the resistor α1 and input to the microcomputer αη, Signal B is input to the microcomputer αη at the same time as combustion starts.
At the step entrance, the timer starts counting the time from the start of Star H and combustion. When a predetermined time elapses in step (c), that is, a time period 2 for which the ionic current of the flame is almost stabilized, e.g. 10 minutes, the process moves from step @ to step C25).
After burning at the maximum combustion amount for 0 seconds, in step (1), the ion current [if] for that time is measured. An ion current value of 1 is input to a microcomputer (within 1 force) determination device, and in step (5) it is compared with a threshold value 10 of an ion current that causes abnormal combustion, which was preset in the storage device.
If if is smaller than lO, it is determined that abnormal combustion is due to tar accumulation, and the fire is extinguished in step (to).

Output signal C to operate dry heating means a, and step by step change the temperature in the vaporization chamber (4) to approximately 500°C.
The inside of the vaporization chamber (4) is heated and burned to remove accumulated tar.

Further, when if is larger than io, normal combustion continues at step (to).

FIG. 3 shows the relationship between the amount of 1-cool deposited in the vaporization chamber (4) and the ionic current of the flame when it burns in that state.

It is desirable that the threshold b value 1° of the ion current that causes abnormal combustion is set to 115 to 1/6 of the ion current that occurs during combustion under normal conditions. If this value is too large, a malfunction may occur easily, and if it is too small, the combustion condition may deteriorate considerably and dry firing may not be performed even if soot is generated.

Also, as shown in Figure 4, the ion current of the flame changes depending on the oxygen concentration of the combustion air, so after burning for a long time indoors with a low ventilation rate, if and i.

When compared, the ion current decreases in the oxygen-deficient state, so there is a risk that combustion will be stopped and dry firing will occur regardless of the amount of tar deposited in the vaporization chamber (41).

Therefore, the measurement of if and the comparison with 1o are made after the start of combustion.
Time for the ion current of the flame to become almost stable 1 For example, about 10 to 2
It is desirable to carry out the test after 0 minutes have elapsed and make the judgment at that point.b
o Figure 5 shows the variation in flame ion current depending on the amount of combustion. The ion current value varies depending on each combustion machine, and when combustion is performed at the maximum combustion amount, the variation becomes smallest and the ion current value becomes thicker. If you switch to the desired amount and start burning after a certain amount of time has elapsed, there will be no malfunctions, and you can automatically dry-burn at the optimal time.

〔Effect of the invention〕

As described above, according to the present invention, after a predetermined time has elapsed during which the ionic current of the flame is almost stabilized after flame formation, combustion is forcibly performed at the maximum combustion amount, and the ionic current value if at that time is measured. The presence or absence of an abnormality in the combustion state is determined by comparing if with a preset threshold value 10 of the ion current that causes abnormal combustion, and if the determination result is that the abnormal combustion state is due to tar accumulation, the I decided to do dry firing.

There is no need to visually judge the state of abnormal combustion, and combustion can be automatically stopped before harmful gases or soot are generated and a bad odor wafts, allowing automatic dry firing, and the amount of tar deposited in the vaporization chamber is reduced. Since dry firing is possible, it is possible to obtain a vaporization type combustion device that has advantages in use, such as being able to remove tar in a short time by dry firing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a vaporization combustion apparatus according to an embodiment of the present invention, FIG. 2 is a flowchart showing its operation, FIG. 3 is a diagram showing the relationship between ion current and tar deposit amount, and FIG. 4 is an ion FIG. 5 is a diagram showing the relationship between current and m degrees of oxygen, and FIG. 5 is a diagram showing the relationship between combustion amount and variation in ion current. In the figure, (4) is the vaporization chamber, α1 is the burner head, and α3 is the frame rod. The microcomputer Og is a dry firing means. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa (2 others); zo rod on fly Figure 2 end

Claims (3)

[Claims] (1) In a vaporizing combustion device equipped with a dry firing means for burning the vaporizing chamber at a higher temperature than during normal combustion, there is a timer that counts the time from the start of combustion, and a timer that measures the time after flame formation. After a predetermined time period in which the ion current is almost stabilized, an ion current detection means measures the ion current value i_f at that time, and compares the ion current value i_f with a preset threshold value i_0 of the ion current that causes abnormal combustion. and determining means for determining whether or not there is an abnormality in the combustion state, and when the determining means determines that there is an abnormality, combustion is stopped and the dry firing means is operated. (2) The evaporative combustion device according to claim (1), wherein the ion current value i_f is measured at the maximum combustion amount after a certain period of time has elapsed. (3) The evaporative combustion apparatus according to claim (1), wherein the timer and the determination means are constituted by a microcomputer.