JPH11287439A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ease of handling by extending combustion time when tar is adhered and burned in a vaporizer. SOLUTION: This apparatus is provided with a fuel supply means 24, a vaporization part 32 with a vaporization chamber 37, a heater 42 for heating the vaporization part 32, a nozzle 34 for injecting a vaporization gas, a burner part 44 to burn the vaporization gas, a temperature computing part 58 to compute a temperature difference between an inlet part and an outlet part of the vaporization chamber 37, a flame rod 47 for detecting combustion state, a combustion checking means 53 which has a flame failure detection set value, an oxygen deficiency detection set value and an oxygen deficiency judgment set value to detect combustion state from an output of the flame rod and the above detection set values and a control part 62 for controlling combustion operation. When an output of the temperature computing part 58 is not more than a specified value, the control part 62 increases the quantity of combustion according to an output of the combustion checking means 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for vaporizing and burning a liquid fuel, and more particularly to a combustion failure due to adhesion of a tar component to a vaporizer.

[0002]

2. Description of the Related Art Various types of combustion apparatuses of this type have been proposed in the past, some of which burn liquid fuel gas obtained by vaporizing kerosene. Hereinafter, a combustion apparatus for burning the liquid fuel gas will be described with reference to an example configured as shown in FIG.

[0003] First, fuel is supplied from a cartridge tank 2 to a tank 1, and the fuel in the tank 1 is supplied to a vaporizing section 4 maintained at a high temperature by a pump 3. The supplied fuel is vaporized by a vaporization promoting material (not shown) such as a porous ceramic body or a wire mesh provided in the vaporization section 4 to become a vaporized gas, and has a high pressure in the vaporization section 4. Spouted horizontally. The fuel ejected from the nozzle 5 is ejected into a mixing pipe 6 provided at a position downstream of the nozzle 5 while sucking primary air by an ejector effect, and is mixed here, and is mixed with the mixing pipe 6 in a line shape. And burned there. The combustion gas generated by this combustion is guided upward by a combustion tube 8 disposed so as to cover the periphery of the burner section 7, and mixed with a room air flow from a blower 10 by a duct 9 covering the combustion tube 8. It is discharged as warm air and used for heating. When the fuel supply amount is adjusted by changing the drive frequency and applied voltage of the pump 3, the combustion device also changes the amount of jet from the nozzle 5 and the primary air amount increases and decreases accordingly, and the fuel-to-air ratio is substantially constant. It is possible to change the amount of combustion while maintaining it.

A flame rod 11 is disposed near the burner 7 so as to be in contact with the flame. A flame current flowing through the flame between the flame rod 11 and the burner 7 is detected to burn the flame. A combustion detection unit 12 for checking the state is provided, and the combustion operation is controlled by the output of the combustion detection unit 12. The combustion detector 12 has a misfire detection set value for judging that combustion has exceeded the combustion limit range, and an oxygen deficiency detection setting for judging that an abnormal combustion state has been set larger than the misfire detection set value. A value is provided, and when the flame form changes for some reason and the flame current decreases and falls below each detection set value, combustion is stopped by a predetermined operation to ensure safety.

[0005]

However, in such a conventional combustion apparatus, there are various possible causes of the change in the flame current. For example, a deteriorated oil which has been stored and oxidized for a long period of time, or a different component is used. When defective kerosene such as mixed foreign oil is used as fuel, tar is generated in the porous portion of the vaporization promoting material that vaporizes the fuel in the vaporization section 4 to cause clogging, resulting in poor combustion due to poor vaporization. When clogging progresses, there is a problem that clogging itself causes poor combustion.

That is, when clogging occurs and poor vaporization progresses, the internal pressure of the vaporizing section 4 does not increase so much that the vaporized gas is jetted from the nozzle 5 weakly, and the fuel is jetted out of the nozzle 5 as a liquid. In addition, the ejector effect due to the ejection is weakened, the suction amount of the primary air is reduced, the combustion state of the burner unit 7 is deteriorated, and pulse combustion and odor, soot, carbon monoxide which greatly change the flame form are generated. ,
Eventually it will misfire.

In addition, the clogging of the vaporization accelerating material in the vicinity of the fuel inlet of the vaporization section 4 hinders the fuel from entering the vaporization section 4 and causes the vaporization section 4 to supply the fuel from the pump 3. The amount of fuel that enters, that is, the amount of vaporization decreases, and the amount of combustion decreases even if the internal pressure of the vaporization section 4 increases. Eventually, the combustion becomes weak and the flame form becomes extremely small, exceeding the combustion limit and generating odor. Or misfire.

However, in a slight stage where the accumulation of tar components in the vaporization chamber begins to change the combustion state, the vaporization ability is restored by increasing the fuel supply, and the combustion state is temporarily returned to normal combustion. Is what you do.

[0009] In addition to the above, when the flame current changes due to silicon being mixed in the fuel for some reason or when a hair spray containing silicon oil is frequently used in the vicinity of the combustion device, the indoor current is changed. The silicon oil scatters and evaporates, and the evaporated silicon oil is vaporized in the vaporizing section 4, mixed with the fuel sprayed from the nozzle 5, and ejected from the flame holes of the burner section 7. When such a mixed gas containing silicon oil is burned, silicon dioxide is generated from the silicon oil. The silicon dioxide floats in the combustion flame, but a voltage constantly applied between the flame rod 11 and the burner 7. And is combined with the oxide film on the surface of the frame rod 11 and accumulates on the surface of the frame rod 11. Therefore, the frame rod 11
And the flame current flowing between the flame rod 11 and the burner section 7 decreases rapidly despite the normal flame form. That is, there is a problem that the current value becomes equal to or less than the predetermined value in spite of normal combustion, and the combustion detecting unit 12 determines that the combustion is incomplete and stops the combustion operation. In recent years, the number of products containing silicon has increased especially in building materials and cosmetics,
Troubles due to the above phenomena have become more frequent.

Further, the cause of the change of the flame current is as follows.
When the density of the combustion air decreases due to the lack of oxygen and the flow velocity increases, the flame becomes lift combustion in which the flame is separated from the burner section 7, the flame current between the flame rod 11 and the burner section 7 decreases, and the combustion detection section 12 In some cases, it is determined that combustion is incomplete and the combustion operation is stopped.

As described above, in the conventional combustion apparatus, the flame current detected by the flame rod 11 disposed near the burner section 7 is detected by the combustion detection section 12 by detecting the combustion failure caused by the change of the flame form due to various causes. Since the determination is made, the combustion is stopped at a predetermined detection set value regardless of the cause of the combustion failure. In other words, poor combustion due to accumulation of tar components in the vaporization chamber can be detected only when the abnormal phenomenon has greatly progressed, and the combustion is stopped in a short period of time due to the lack of oxygen.

The present invention is intended to reliably detect a decrease in flame current due to poor combustion due to accumulation of tar components in a vaporization chamber, extend combustion time, and improve usability.

[0013]

In order to achieve the above object, a fuel supply means, a vaporization section having a vaporization chamber for vaporizing the supplied fuel, a heater for heating the vaporization section,
A nozzle for ejecting gas vaporized in the vaporizing section, and a burner section for burning the vaporized gas ejected from the nozzle,
A second temperature detector provided in the vicinity of the inlet of the vaporization chamber, a first temperature detector provided in the vaporization section near the nozzle to detect a heat recovery temperature by combustion heat, and a combustion detector provided in the vicinity of the burner; A flame rod for detecting a flame current flowing through the flame, a misfire detection set value for judging that the combustion limit range has been exceeded, and an acid for judging that an abnormal combustion state has been set to a value larger than the misfire detection set value. A combustion confirmation means having a lack detection set value and an oxygen deficiency determination set value larger than the oxygen deficiency detection set value, and confirming a combustion state from the flame rod output and the respective detection set values; Detector and second
A temperature calculating unit for calculating a temperature difference between an inlet and an outlet of the vaporization chamber from a temperature detected by a temperature detector, and a control unit for controlling a combustion operation with an output of the combustion confirming means and the temperature calculating unit, and When the output of the temperature calculation section becomes equal to or less than a predetermined value, the control section increases the combustion amount stepwise according to the flame rod output.

According to the invention, when the temperature difference between the inlet and the outlet of the vaporizing chamber falls below a predetermined value, the flame rod output is set based on the set value of oxygen deficiency detection which is larger than the normal set value of oxygen deficiency detection. To determine if there is combustion failure due to accumulation of tar components in the vaporization chamber or combustion failure due to oxygen deficiency.If combustion failure is due to accumulation of tar components in the vaporization chamber, the amount of combustion is determined under predetermined conditions. The combustion time is extended by trying to recover the combustion state. In other words, when tar components accumulate in the vaporization chamber or when the state becomes oxygen-deficient, the temperature difference between the inlet and the outlet of the vaporization chamber becomes smaller, and the flame rod output at that time becomes flame-shaped in the oxygen-deficient state. When the tar component accumulates in the vaporization chamber, the flame gradually decreases, but the flame gradually decreases, but the combustion is performed in close contact with the burner, and the flame rod The output temporarily shows a tendency to increase and then gradually decreases. By detecting the difference in the change in flame rod output, it is judged whether combustion failure due to accumulation of tar components in the vaporization chamber or combustion failure due to oxygen deficiency. When combustion is stopped, the accumulation of tar components in the vaporization chamber is stopped, and the amount of combustion is increased under predetermined conditions to try to restore the combustion state and extend the combustion time, thereby improving usability and safety. We are trying to secure.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The combustion apparatus according to claim 1 of the present invention
Fuel supply means, a vaporizing section having a vaporizing chamber for vaporizing the supplied fuel, a heater for heating the vaporizing section, a nozzle for jetting the gas vaporized by the vaporizing section, and a vaporized gas jetted from the nozzle. A burner section for burning, a second temperature detector provided near an inlet of a vaporizing chamber provided in the vaporizing section, and a first temperature detector provided in a vaporizing section near a nozzle and detecting a heat recovery temperature due to combustion heat. And a flame rod disposed near the burner portion for detecting a flame current flowing through the combustion flame, a misfire detection set value for judging that the combustion limit range has been exceeded, and a value larger than the misfire detection set value. It has an oxygen deficiency detection set value for determining that an abnormal combustion state has occurred, and an oxygen deficiency determination set value that is set to a value larger than the oxygen deficiency detection set value. Check Burning confirmation means, a temperature calculating section for calculating a temperature difference between an inlet and an outlet of the vaporization chamber based on temperatures detected by the first temperature detector and the second temperature detector, and outputs of the combustion confirmation means and the temperature calculating section A control unit for controlling the combustion operation, etc., when the output of the temperature calculation unit becomes equal to or less than a predetermined value, the control unit increases the combustion amount stepwise according to the flame rod output. I have.

When the temperature difference between the inlet and the outlet of the vaporization chamber falls below a predetermined value, the output of the frame rod is confirmed by an oxygen deficiency determination set value provided above a normal oxygen deficiency detection set value. In this way, it is determined whether combustion failure due to accumulation of tar components in the vaporization chamber or combustion failure due to lack of oxygen,
In the case of poor combustion due to accumulation of tar components in the vaporization chamber, the amount of combustion is increased under predetermined conditions to attempt to recover the combustion state, and the combustion time is extended. In other words, when tar components accumulate in the vaporization chamber or when the state becomes oxygen-deficient, the temperature difference between the inlet and the outlet of the vaporization chamber becomes smaller, and the flame rod output at that time becomes flame-shaped in the oxygen-deficient state. When the tar component accumulates in the vaporization chamber, the flame gradually decreases, but the flame gradually decreases, but the combustion is performed in close contact with the burner, and the flame rod The output temporarily shows a tendency to increase and then gradually decreases. By detecting the difference in the change in flame rod output, it is judged whether combustion failure due to accumulation of tar components in the vaporization chamber or combustion failure due to oxygen deficiency. When combustion is stopped, the accumulation of tar components in the vaporization chamber is stopped, and the amount of combustion is increased under predetermined conditions to try to restore the combustion state and extend the combustion time, thereby improving usability and safety. We are trying to secure.

Further, in the combustion apparatus according to the second aspect, when the output of the temperature calculating section becomes equal to or less than a predetermined value, the control section confirms the flame rod output, and the flame rod output is set based on the oxygen deficiency determination set value. When it is large, the combustion amount is increased stepwise within a predetermined number of times.

If the flame rod output when the temperature difference between the inlet and the outlet of the vaporization chamber becomes equal to or less than a predetermined value is larger than the set value for determination of oxygen deficiency, combustion failure due to accumulation of tar components in the vaporization chamber is caused. When it is determined that there is, a combustion amount increasing operation is performed within a predetermined number of times, and a recovery of the combustion state is attempted to extend the combustion time and ensure safety.

In the combustion apparatus according to a third aspect of the present invention, when the combustion amount is within a predetermined range, the control unit compares the flame rod output with the oxygen deficiency determination set value.

The operation of comparing the flame rod output with the oxygen deficiency determination set value is performed within a predetermined combustion amount range in which a change in combustion state can be reliably detected by a temperature difference between an inlet and an outlet of the vaporizing chamber. The accumulation state of the tar component in the vaporization chamber and the oxygen deficiency state can be accurately distinguished.

According to a fourth aspect of the present invention, the control unit does not compare the flame rod output with the oxygen deficiency detection set value for a predetermined time from the start of combustion and for a predetermined time after a predetermined amount of combustion is reached. Like that.

Then, the comparison operation between the flame rod output and the oxygen deficiency determination set value during the period in which combustion is unstable is stopped,
By performing during a stable combustion period in which a change in the combustion state can be reliably detected by the temperature difference between the inlet and the outlet of the vaporization chamber, the accumulation state of the tar component and the oxygen-deficient state in the vaporization chamber can be accurately distinguished. I have.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, the configuration of a hot-air heating apparatus using a combustion apparatus according to Embodiment 1 of the present invention will be described with reference to FIG.

Reference numeral 21 denotes a main body case, which is provided with a tank 22 for holding liquid fuel on a lower side thereof and a detachable cartridge tank 23 above the tank 22. 24
Is a pump mounted on the upper surface of the tank 22, which is adapted to lead an oil feed pipe 25 from the upper end thereof to supply fuel to the combustion section 26.

Reference numeral 27 denotes a combustion tube for guiding high-temperature combustion exhaust gas from the combustion section 26 upward, and a blower 28 for taking in and sending out indoor air flow is disposed behind the combustion tube. 29 is a combustion cylinder 27
This is a duct that mixes the combustion exhaust gas from the room with the indoor air flow to produce warm air. Reference numeral 30 denotes the combustion of the combustion section 26 and the blower 28.
The control device controls the pump 24, the blower 28, and the like in a predetermined sequence based on an operation condition signal input from an operation unit (not shown). Further, a flame rod 31 is disposed in the combustion section 26 so as to be in contact with the flame so as to monitor the combustion state.

Next, the detailed configuration and operation of the combustion section 26 will be described with reference to the block diagram of FIG. Numeral 32 denotes a vaporizing section, on which a circular burner receiving seat 33 is provided, and a nozzle 34 is positioned substantially at the center of the burner receiving seat 33.
And an opening 35 for taking in primary air for supplying combustion air is provided between the burner receiving seat 33 and the nozzle 34, and a cylindrical vaporization chamber 37 is formed on the outer periphery through a communication port 36 communicating with the nozzle. It extends in the direction and is integrally formed. The vaporizing chamber 37 is formed by fixing a vaporizing cap 38 connected to the oil feed pipe 25 to the vaporizing section 32 by brazing or the like.
The vaporizing chamber 37 is provided with a cylindrical brush-shaped vaporizing element 41 formed by interposing a number of flocking lines 40 between a plurality of axes 39 and twisting the axes 39. Further, a heater 42 is provided along the lower surface side of the burner receiving seat 33 on the opposite side of the vaporizing chamber 37 of the vaporizing section 32.

Reference numeral 43 denotes a bottomless cylindrical mixing tube mounted on the burner receiving seat 33 so as to be located above the nozzle 34. The mixing tube 43 is opposed to the nozzle 34, and the fuel gas ejected from the nozzle 34 and its fuel It mixes with the primary air sucked by the ejector effect by the gas ejection. 4
Numeral 4 is a burner part in the form of a cylinder covered with a burner which is overlapped and covered on the burner receiving seat 33 from the upper opening side so as to cover the mixing tube 43, and has a large number of flame holes 44A formed in the lower peripheral wall. 45 is a flame hole 44A
An upwardly tapered burner ring attached to the burner receiving seat 33 so as to surround the outer periphery of the burner receiving seat 33.
This is the heat receiving part formed in the above.

Reference numeral 47 denotes a frame rod provided at a position facing the flame hole 44A provided in the burner portion 44 so as to abut against the flame.
By applying a predetermined voltage in between, a flame current flows through the flame. Reference numeral 48 denotes a combustion detection unit that detects a flame current flowing through the frame rod 47 and extracts the flame current as a frame rod output.

Reference numeral 49 denotes a misfire detection setting unit for setting a misfire detection set value for judging that the combustion limit has been exceeded. Reference numeral 50 denotes an oxygen deficiency provided above the misfire detection set value for judging an abnormal combustion state. This is an oxygen deficiency detection setting unit that sets a detection set value. Reference numeral 51 denotes an oxygen deficiency determination set value that is larger than the oxygen deficiency detection set value, and is a combustion confirmation set value for determining whether the change in the flame rod output is due to oxygen deficiency or tar adhesion in the vaporization chamber.

Reference numeral 52 denotes a flame rod output of the combustion detector 48 and a misfire detection set value set by the misfire detection setting unit 49, an oxygen deficiency detection setting unit 50, and an oxygen deficiency determination set value setting unit 51;
The determination unit compares the oxygen deficiency detection set value with the oxygen deficiency determination set value and outputs a combustion detection signal. These 48 to 52 form the combustion confirmation means 53.

Reference numeral 54 denotes a first temperature detector provided in the vaporizing section 32 near the nozzle 34, and detects a heat recovery temperature by combustion.
Reference numeral 55 denotes a second temperature detector disposed at the entrance of the vaporization chamber 37, which detects the temperature of the entrance of the vaporization chamber 37 cooled by the fuel supplied from the oil supply pipe 25.

Reference numeral 56 denotes a first temperature detector for obtaining temperature information of the outlet of the vaporization chamber 37 based on a signal from the first temperature detector 54. 57 is the vaporization chamber 3 according to the signal of the second temperature detector 55
7 is a second temperature detecting section for obtaining temperature information of the inlet section.
Reference numeral 58 denotes a temperature calculation unit for calculating a temperature difference between the inlet and the outlet of the vaporization chamber 37 from the first temperature detection unit 56 and the second temperature detection unit 57, and a vaporization unit cooled by the heat recovery temperature and the supplied fuel. A change in the combustion state and a change in the vaporization capacity in the vaporization chamber 37 are detected from the temperature state 32. Reference numeral 59 denotes a comparison value setting unit that sets a comparison value to be compared with the calculation result of the temperature calculation unit 58.

Numeral 60 compares the operation result of the temperature operation unit 58 with the comparison value set by the comparison value setting unit 59, and when the operation result of the temperature operation unit is smaller than the comparison value, that is, at the entrance and the exit of the vaporization chamber 37. This is a comparison unit that outputs when the temperature difference of the unit is lower than a predetermined temperature difference.

Reference numeral 61 indicates the presence / absence of a signal from the determination unit 52 of the combustion confirmation means 53 when an output is output from the comparison unit 60 in which the temperature difference between the inlet and outlet of the vaporization chamber 37 is lower than a predetermined temperature difference. If there is no signal, that is, if the flame rod output is larger than the oxygen deficiency determination set value, the combustion amount increasing operation determination unit outputs a signal for increasing the combustion amount under a predetermined condition. Control unit 62 for controlling
Is formed.

The operation of the above configuration will be described. The tank 22 is maintained at a constant oil level from the cartridge tank 23.
Is sucked up from the tank 22 by the pump 24 and sent to the vaporization chamber 37 of the combustion unit 26 via the oil supply pipe 25. The fed fuel is vaporized in the vaporization chamber 37 maintained at a predetermined temperature or higher by the heater 42 and becomes a high pressure and is ejected from the nozzle 34. At this time, the primary air is sucked by the ejector effect and the downstream side of the vaporization chamber 37 is sucked. The mixture is supplied into the burner section 44 after being mixed in the provided mixing pipe 43, and is ejected from the flame hole 44A and burned. Then, the generated high-temperature combustion exhaust gas flows above the combustion cylinder 27, is mixed with the indoor air flow from the blower 28 in the duct 29, is discharged again into the room as warm air, and is used for heating. Then, the control device 30 controls the heater 42, the pump 24, the blower 28, and the like in a predetermined sequence based on the conditions set by the operation unit to start and stop the operation, and to change the combustion amount. Perform operation control.

The combustion in the burner section 44 will be described.
The fuel gas ejected from the nozzle 34 flows into the mixing pipe 43 provided on the downstream side of the vaporization chamber 37 while sucking the primary air by the ejector effect, is mixed, and is discharged from the upper opening into the burner 44 and mixed. A large number of flame holes 4 provided on the peripheral wall below the burner portion 44 by flowing back around the outer periphery of the pipe 43.
It gushes from 4A and burns.

At this time, the mixed gas turns back to the burner section 44 and flows around the mixing pipe 43, where diffusion mixing and uniform pressure are promoted, and the mixed gas is jetted out uniformly from the flame hole 44A to form a uniform flame. I do. The flame formation direction is controlled to be upward by a burner ring 45 provided on the outer periphery of the flame so that stable combustion without lift is performed. Further, the heat receiving flange 46 is heated by the flame formed in the flame hole 44A of the burner portion 44, and the temperature of the vaporizing chamber 37 is maintained at a certain temperature or more by the heat recovery action from the flame. It is possible to reduce part or all of the energization.

A flame rod 47 is provided in the vicinity of the flame hole 44A so as to face the flame hole 44A. A flame current flowing through the flame between the flame rod 47 and the burner part 44 is detected by a combustion detector 48. To determine the output and the oxygen deficiency setting value, oxygen deficiency detection setting value, and misfire detection setting value set by the oxygen deficiency setting value setting unit 51, the oxygen deficiency detection setting unit 50, and the misfire detection setting unit 49. The comparison in the section 52 confirms a change in the combustion operation such as poor combustion.

The vaporization of the fuel supplied to the burner section 44 will be described. A vaporizing element 41 having a cylindrical brush shape is disposed in the vaporizing chamber 37, and the fuel that has entered the vaporizing chamber 37 uses the inner wall of the vaporizing chamber 37 maintained at a high temperature or the vaporizing element 41.
, And is vaporized and ejected from the nozzle 34. Also,
If defective fuel is mixed at that time, first the oil feed pipe 2
The fuel entering from No. 5 gradually evaporates in the process of reaching the nozzle 34, and at this time, the defective components of the fuel together with the vaporized gas of the normal fuel are converted into insufficient vaporized fuel vaporized gas in the vaporization chamber 37. It flows straight from the inlet to the nozzle 34 side, and in the middle thereof, a large number of flocking lines 4 of the vaporizing element 41.
Touching 0 collects as a tar component. Therefore,
Since the vaporized gas reaching the nozzle 34 does not include insufficiently vaporized fuel vaporized gas, the vaporized gas ejected from the nozzle 34 is ejected stably and the combustion becomes stable.

However, when the tar component collected in the vaporizing element 41 accumulates, the capability of supplying the vaporized gas to the nozzle 34 is reduced, which affects the combustion state. And finally, it is accumulated in the entire vaporization chamber 37,
It becomes clogged and the vaporization ability is reduced, resulting in insufficient vaporization leading to misfire.

Therefore, if the accumulation of tar components affects the combustion state, the second temperature detector 55 provided at the inlet of the vaporizing chamber 37 and the first temperature detector 55 provided at the outlet thereof.
The temperature of the inlet and outlet of the vaporization chamber 37 is determined via the temperature detector 54, and the respective temperature information is input to the temperature calculator 58 to calculate the temperature difference between the inlet and outlet of the vaporization chamber 37. As determined, the accumulation state of the tar component in the vaporization chamber 37 is detected based on the value of the temperature difference. That is, in a state where the tar component is not accumulated in the vaporization chamber 37, the amount of the fuel supplied from the oil supply pipe 25 passes through the vaporization chamber 37 as it is. Decrease. Thus, the temperature difference between the inlet and outlet of the vaporization chamber 37 calculated by the temperature calculator 58 shows a large value.

When the tar component accumulates in the vaporization chamber 37, the amount of the fuel passing through the vaporization chamber 37 decreases due to the resistance of the tar component. For this reason, the effect of cooling the temperature at the inlet of the vaporization chamber 37 is reduced, and the temperature drop in the vicinity is small. Further, the amount of vaporized gas decreases due to the decrease in the amount of fuel passing, and the amount of combustion decreases, so that the heat recovery temperature detected by the first temperature detector 54 also decreases. Thereby, the temperature difference between the inlet and outlet of the vaporization chamber 37 calculated by the temperature calculator 57 shows a small value. By comparing this temperature difference with the comparison value set by the comparison value setting section 59, the accumulation state of the tar component in the vaporization chamber 37 is detected early and surely. In such a state, the flame gradually decreases, but the combustion is performed in close contact with the burner. Therefore, as shown in FIG. 3A, the flame rod output temporarily increases. , And then gradually decrease. When the change in the flame rod output is detected and it is determined that the combustion state has changed due to the accumulation of the tar component in the vaporization chamber 37, the fuel supplied from the oil feed pipe 25 is increased under a predetermined condition, and the combustion amount is increased. Is performed. By this operation, the combustion state is recovered, and the combustion can be continued. When the temperature difference in the vaporization chamber 37 decreases again, the above operation is repeated a preset number of times. In addition, the combustion in the oxygen-deficient state becomes yellow flame combustion while the flame is lifted, so that the flame rod output gradually decreases as the oxygen concentration decreases, as shown in FIG. It stops at the detection set value and stops when oxygen deficiency is detected.

As described above, in the case where defective combustion occurs due to tar adhesion when defective kerosene is used, the combustion time is extended by repeating the above-described operation of increasing the amount of combustion, thereby improving the usability. In the case of oxygen-deficient combustion, safety is ensured by performing a stop operation at an oxygen-deficiency detection set value.

Next, the operation will be described in detail with reference to the flowchart of FIG. Combustion is started by the control device 30 based on a predetermined combustion sequence, and the first temperature detection unit 56
The temperature difference between the inlet and the outlet of the vaporization chamber 37 is checked by the second temperature detector 57 and the second temperature detector 57 via the temperature calculator 58, and this temperature difference is compared with a predetermined temperature difference set by the comparison value setting unit 59. Check whether it is big or small. If this confirmation result is large, it is determined that tar accumulation in the vaporization chamber 37 has not occurred, and combustion is continued. When the temperature is smaller, the outlet temperature of the vaporization chamber 37 detected by the first temperature detector 56 is decreasing. That is, the heat recovery temperature is decreasing, which means that some change has occurred in the combustion state. The cause of this is detected by a combustion detector 48, which detects a flame current flowing between the flame rod 47 and the burner 44 via a flame formed in the flame outlet 44A, and the output of the combustion detector 48 is compared with an oxygen deficiency determination set value. The judgment is made based on the comparison result. The comparison result is the flame rod output <
In the case of the oxygen deficiency determination set value, it is determined that combustion is poor due to oxygen deficiency
When the flame rod output becomes less than the oxygen deficiency detection set value, stop operation is performed. When the flame rod output> oxygen deficiency determination set value, it is determined that combustion is defective due to accumulation of tar components in the vaporization chamber 37, and a combustion amount increasing operation is performed under predetermined conditions to try to recover the combustion state. This combustion amount increasing operation is performed a predetermined number of times or less, and a stop operation is performed if the flame rod output decreases more than the specified number of times.

As described above, when the flame rod output when the temperature difference between the inlet and outlet of the vaporization chamber becomes equal to or less than the predetermined temperature difference is equal to or greater than the oxygen deficiency determination set value, combustion failure due to oxygen deficiency occurs. It is possible to extend the combustion time during tar-adhesion combustion by performing a predetermined number of operations to increase the amount of combustion by judging whether or not combustion failure due to accumulation of tar components in the vaporization chamber, greatly improving the usability. Things.

(Embodiment 2) The configuration of a combustion apparatus according to Embodiment 2 of the present invention will be described with reference to FIG.

The same parts as those in the first embodiment are denoted by the same reference numerals and the description is omitted. In the second embodiment, when the temperature difference between the inlet and the outlet of the vaporization chamber is equal to or less than the predetermined temperature difference, the flame rod output at that time is equal to or higher than the oxygen deficiency determination set value, and the combustion amount is within the predetermined range. Attempts are sometimes made to restore the combustion state by increasing the amount of combustion, and the purpose is to reliably extend the combustion time during tar-adhesion combustion.

Reference numeral 63 denotes a combustion amount control unit which is configured to input the combustion amount signal to the combustion amount increase operation judging unit 61 of the control unit 62.

In the above configuration, the temperature difference between the inlet and the outlet of the vaporization chamber 37 is checked in the same manner as in the first embodiment, and if this temperature difference is smaller than the temperature difference set by the comparison value setting section 59, the combustion confirmation means When the flame rod output is larger than the oxygen deficiency determination set value from the determination unit 53, a signal is sent to the combustion amount increase operation determination unit 61, and the combustion amount signal sent from the combustion amount control unit 63 is within a predetermined range. , The signal from the determination unit 52 is determined to be valid, and the combustion amount increasing operation is performed. Thus, in the combustion amount range in which the heat recovery temperature due to the combustion heat can be stably detected, the change in the combustion state is detected, and the tar-adhered combustion and the oxygen-deficient combustion are determined. In addition to extending the combustion time, safety is also ensured.

(Embodiment 3) The configuration of a combustion apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the third embodiment, when the temperature difference between the inlet and the outlet of the vaporization chamber is equal to or less than the predetermined temperature difference and the flame rod output at that time is equal to or greater than the set value for oxygen deficiency determination, the combustion immediately after the start of combustion or the fluctuation of the combustion amount Immediately after the combustion is unstable, do not perform the combustion amount increase operation, reliably judge the tar adhesion combustion and oxygen-deficient combustion, and extend the combustion time for tar adhesion combustion to improve usability and safety. The purpose is to ensure the performance.

Numeral 64 is a combustion stability judging section, and the combustion amount control section 6
3, the signal from the determination unit 52 is not determined until the combustion is stabilized.

In the above configuration, the temperature difference between the inlet and the outlet of the vaporizing chamber 37 is checked in the same manner as in the first embodiment, and if this temperature difference is smaller than the temperature difference set by the comparison value setting section 59, the combustion confirmation means When the flame rod output is larger than the oxygen deficiency determination set value from the determination unit 53, a signal is sent to the combustion amount increasing operation determination unit 61. The signal sent from the judging section 52 is invalidated until a signal indicating that the combustion is stabilized is input from the combustion stability judging section 64, and the combustion stability judging section 6
When the combustion stability signal is input from 4, the combustion amount increase determination section 61 determines whether the combustion is tar-adhesion combustion or oxygen-deficient combustion based on the signal of the determination section 52, and performs the combustion amount increase operation under predetermined conditions during the tar-adhesion combustion. Like that. In this way, in the combustion amount state where the heat recovery temperature due to the combustion heat can be detected stably, it is determined whether tar-adhesion combustion or oxygen-deficient combustion has occurred, and the combustion time for tar-adhesion combustion can be reliably extended, and safety can be ensured. Is also intended.

[0055]

As described above, according to the combustion apparatus of the first aspect, when the temperature difference between the inlet and the outlet of the vaporization chamber falls below a predetermined value, it is larger than a normal oxygen deficiency detection set value. By checking the flame rod output based on the oxygen deficiency determination set value, it is determined whether the combustion failure due to accumulation of tar components in the vaporization chamber or the combustion failure due to oxygen deficiency, and the accumulation of tar components in the vaporization chamber. In the case of poor combustion, the combustion amount is increased under predetermined conditions to attempt to recover the combustion state, and the combustion time is extended. In other words, when tar components accumulate in the vaporization chamber or when the state becomes oxygen-deficient, the temperature difference between the inlet and the outlet of the vaporization chamber becomes smaller, and the flame rod output at that time becomes flame-shaped in the oxygen-deficient state. When the tar component accumulates in the vaporization chamber, the flame gradually decreases, but the flame gradually decreases, but the combustion is performed in close contact with the burner, and the flame rod The output temporarily shows a tendency to increase and then gradually decreases. By detecting the difference in the change in flame rod output, it is judged whether combustion failure due to accumulation of tar components in the vaporization chamber or combustion failure due to oxygen deficiency. When combustion is stopped, the accumulation of tar components in the vaporization chamber is stopped, and the amount of combustion is increased under predetermined conditions to try to restore the combustion state and extend the combustion time, thereby improving usability and safety. Can be secured.

According to the second aspect of the present invention, when the flame rod output when the temperature difference between the inlet and the outlet of the vaporization chamber becomes equal to or less than a predetermined value is larger than the oxygen deficiency determination set value, It is determined that the combustion is defective due to accumulation of tar components in the fuel, and the combustion amount is increased within a predetermined number of times to try to recover the combustion state, thereby extending the combustion time and ensuring safety.

According to the combustion apparatus of the third aspect, the operation of comparing the flame rod output with the set value of oxygen deficiency determination is a predetermined operation in which a change in the combustion state can be reliably detected based on the temperature difference between the inlet and the outlet of the vaporizing chamber. Within the combustion amount range of
The accumulation state of the tar component in the vaporization chamber and the oxygen deficiency state can be accurately distinguished.

According to the combustion device of the fourth aspect, the operation of comparing the flame rod output and the set value of oxygen deficiency during the period in which combustion is unstable is stopped, and the temperature difference between the inlet and the outlet of the vaporization chamber is determined. By performing the combustion in a stable combustion period in which a change in the combustion state can be reliably detected, the accumulation state of the tar component in the vaporization chamber and the oxygen-deficient state can be accurately distinguished.

[Brief description of the drawings]

FIG. 1 is a block diagram of a combustion device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a hot air heater using the same device.

FIG. 3 is a diagram showing a change state of a frame rod output and a temperature difference of the apparatus.

FIG. 4 is a flowchart showing an operation state of the apparatus.

FIG. 5 is a block diagram of a combustion device according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a combustion device according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional combustion device.

[Explanation of Signs] 32 vaporizer 34 nozzle 37 vaporizer 42 heater 44 burner 47 flame rod 48 combustion detector 49 misfire detection setting unit 50 oxygen deficiency detection setting unit 51 oxygen deficiency determination setting value setting unit 53 combustion confirmation means 54 1 Temperature Detector 55 Second Temperature Detector 56 First Temperature Detector 57 Second Temperature Detector 58 Temperature Calculator 61 Combustion Rate Increase Operation Judgment Unit 62 Control Unit

Claims (4)

[Claims] 1. A fuel supply means, a vaporizing section provided with a vaporizing chamber for vaporizing supplied fuel, a heater for heating the vaporizing section, a nozzle for ejecting gas vaporized in the vaporizing section, and a nozzle. A burner section for burning the ejected vaporized gas, a second temperature detector provided near an inlet of a vaporization chamber provided in the vaporization section, and a heat recovery temperature detected by a combustion heat provided in a vaporization section near a nozzle. A first temperature detector, a flame rod disposed near the burner for detecting a flame current flowing through a combustion flame, a misfire detection set value for judging that a combustion limit range has been exceeded, and the misfire detection setting An oxygen deficiency detection set value for determining that an abnormal combustion state has been set to a value larger than the value, and an oxygen deficiency determination set value set to a value larger than the oxygen deficiency detection set value, the flame rod output and the More fuel than each detection set value And combustion confirmation means to confirm the state,
A temperature calculating section for calculating a temperature difference between the inlet and the outlet of the vaporization chamber based on the temperatures detected by the first temperature detector and the second temperature detector; and a combustion operation based on the output of the combustion confirming means and the temperature calculating section. And a control unit for controlling, when the output of the temperature calculation unit becomes equal to or less than a predetermined value, the control unit increases the combustion amount in a stepwise manner in accordance with the flame rod output. 2. The control unit checks the frame rod output when the output of the temperature calculation unit becomes equal to or less than a predetermined value, and when the frame rod output is larger than the oxygen deficiency determination set value.
2. The combustion device according to claim 1, wherein the combustion amount is increased stepwise within a predetermined number of times. 3. The combustion apparatus according to claim 1, wherein the control section compares the flame rod output with an oxygen deficiency determination set value when the combustion amount is within a predetermined range. 4. The control unit according to claim 1, wherein the control unit does not compare the flame rod output with the oxygen deficiency detection set value for a predetermined time after the start of combustion and for a predetermined time after the predetermined amount of combustion is reached. The combustion device according to any one of claims 1 to 4.