JPH11287438A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ease of handling by extending combustion possible time when silicon is adhered and burned. SOLUTION: This apparatus is provided with a fuel supply means, a vaporization part 32 wherein a vaporization chamber 7 is arranged to vaporize a fuel, a heater 42 for heating the vaporization part 32, a nozzle 34 to inject a vaporized gas, a burner part 44 for burning the injected vaporization gas, a temperature detection part 54 for detecting the temperature of the vaporization part 32, a frame rod 47 arranged near the burner 44, a combustion checking means 52 which has a flame failure detection set valve and an oxygen deficiency detection set value set larger than the flame failure detection set value to detect the combustion state from an output of the flame rod 47 and the above detection set values and a control part 58 to control the combustion operation from outputs of the temperature detection part 54 and the combustion checking means 52. When an output indicating the detection of oxygen deficiency is sent from the combustion checking means 52, the control part 58 alters the oxygen deficiency detection set value according to an output of the temperature detection part 54.

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 a liquid fuel and burning the vaporized gas, in particular, for detecting a decrease in flame current due to silicon and extending the combustion time.

[0002]

2. Description of the Related Art Various types of combustion apparatuses of this type have been proposed, and some of them burn liquid fuel gas obtained by vaporizing kerosene or the like. 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 exhaust gas generated by this combustion is guided upward by a combustion tube 8 disposed so as to cover the periphery of the burner portion 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 the combustion device having such a conventional configuration, various causes can be considered as a cause of the change in the flame current. For example, when defective kerosene such as a deteriorated oil that has been stored and oxidized for a long period of time or a different type of oil mixed with different components is used as a fuel, tar is generated in the porous portion of the vaporization promoting material that vaporizes the fuel in the vaporizer 4 and clogged. Cause poor combustion due to poor vaporization,
Further, if clogging progresses, there is a problem that the 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.

[0008] In addition to the above, when the flame current changes due to silicon being mixed into the fuel for some reason or when a hair spray containing silicon oil is frequently used in the vicinity of the combustion device, the room may be 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 in 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 defective 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. That is, according to the conventional combustion detection method, even in the case of silicon adhesion where the flame current decreases despite the normal combustion state, there is a problem that 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 the flame current due to the adhesion of silicon, extend the combustion time, and improve the usability.

[0012]

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 temperature detector that detects the temperature of the vaporizer through a temperature detector disposed in the vaporizer, a flame rod that is disposed near the burner and detects a flame current flowing through a combustion flame, A misfire detection set value for judging that the limit range has been exceeded and an oxygen deficiency detection set value for judging that an abnormal combustion state has occurred with a set value larger than the misfire detection set value,
A combustion detection unit that detects a combustion state from the flame rod output and each of the detection set values; and a control unit that controls a combustion operation based on outputs of the temperature detection unit and the combustion detection unit. When the output of the oxygen deficiency detection is issued from the section, the oxygen deficiency detection set value is changed according to the output of the temperature detecting section.

According to the present invention, when the flame rod output falls below the oxygen deficiency detection set value, the temperature of the vaporization chamber at that time is detected by the temperature detection unit, and whether the decrease in the flame rod output is due to silicon adhesion is detected. In order to confirm whether or not silicon is attached, the set value of oxygen deficiency detection is changed to the set value of misfire detection as a lower limit, and the combustion time is extended. That is, when the temperature of the vaporization chamber when the output of the oxygen deficiency detection is issued is equal to or higher than the predetermined temperature, the vaporization of the fuel in the vaporization chamber is normally performed, and the heat recovery from the burner is also normally performed. It is determined that the flame current is not reduced due to tar adhesion or oxygen deficiency, but is due to silicon adhesion to the frame rod etc., and the oxygen deficiency detection set value is set to the lower limit with the misfire detection set value as the lower limit. To change to the side. By lowering the oxygen deficiency detection set value, the combustion time is extended to improve the usability, and safety is ensured by the misfire detection set value.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The combustion apparatus according to claim 1 of the present invention
A fuel supply unit, a vaporization unit including a vaporization chamber for vaporizing the supplied fuel, a heater for heating the vaporization unit, a nozzle for ejecting the gas vaporized by the vaporization unit, and burning the vaporized gas ejected from the nozzle A burner section, a temperature detection section for detecting the temperature of the vaporization section via a temperature detector disposed on the vaporization section, and a frame disposed near the burner section for detecting a flame current flowing through the combustion flame. A rod, a misfire detection set value for judging that the combustion limit range has been exceeded, and an oxygen deficiency detection set value for judging that an abnormal combustion state has been set to a set value larger than the misfire detection set value; A combustion confirmation means for detecting a combustion state from a rod output and each of the detection set values; and a control unit for controlling a combustion operation based on outputs of the temperature detection unit and the combustion confirmation means. Inspection When the output is issued as it is possible to change the oxygen deficiency detection setting value in accordance with the output of the temperature detecting unit.

When the flame rod output falls below the set value for oxygen deficiency detection, the temperature of the vaporization chamber at that time is detected by a temperature detector, and it is confirmed whether or not the decrease in the flame rod output is due to silicon adhesion. Like so
In the case of silicon adhesion, the set value of oxygen deficiency detection is changed to the set value of misfire detection as the lower limit, and the combustion time is extended. In other words, when the temperature of the vaporizing section when the output of the oxygen deficiency detection is issued is equal to or higher than the predetermined temperature, the vaporization of the fuel in the vaporizing chamber is normally performed, and the heat recovery from the burner is also normally performed. It means that it is not due to the decrease in flame current due to tar adhesion or oxygen deficiency, but to silicon adhesion to the frame rod etc.,
The oxygen deficiency detection set value is changed to the lower side with the misfire detection set value as the lower limit value. By lowering the oxygen deficiency detection set value, the combustion time is extended to improve the usability, and safety is ensured by the misfire detection set value.

Further, in the combustion apparatus according to the second aspect, the control unit checks the output of the temperature detection unit when the control unit detects the lack of oxygen by the combustion confirmation unit, and when the temperature of the vaporization unit is higher than a predetermined temperature, the control unit checks the output. The missing detection operation is stopped, and the combustion is continued until the flame rod output decreases to the misfire detection set value.

When the flame rod output drops to the set value for oxygen deficiency detection, and when the temperature of the vaporization chamber at that time is higher than a predetermined temperature, it is determined that silicon is attached, and the set value for oxygen deficiency detection is set to the misfire detection setting. The combustion time is extended by first stopping the combustion by detecting the misfire.

Further, in the combustion apparatus according to the third aspect, the set value of oxygen deficiency detection and the set value of misfire detection are changed before and after the change in accordance with the amount of combustion.

In order to correct the flame rod output that changes depending on the amount of combustion, the set value of oxygen deficiency detection and the set value of misfire detection are varied in accordance with the amount of combustion, and the value after the change when it is determined that silicon is attached is determined. The oxygen deficiency detection set value is also fluctuated according to the amount of combustion in the same way as the correction at the time of the initial setting. To ensure that.

In the combustion apparatus according to a fourth aspect of the present invention, when the control section outputs an output for detecting lack of oxygen from the combustion confirmation means,
Check the output of the temperature detection unit, when the vaporization unit temperature is equal to or higher than a predetermined temperature, change the oxygen deficiency detection set value to the lower limit of the misfire detection set value as a limit, according to the combustion amount Fixed or variable.

The set value of oxygen deficiency detection when it is determined that the cause of the decrease in the flame current is silicon adhesion is changed with the lower limit value of the set value of misfire detection within the combustion range as a limit, and the combustion time is reduced. It is further extended to improve usability.

According to a fifth aspect of the present invention, when the output of the temperature detecting unit falls below a predetermined value, the control unit increases the amount of combustion in a stepwise manner. In such a case, the changing operation of the oxygen deficiency detection set value is not performed.

When the temperature of the vaporization chamber becomes equal to or lower than the predetermined temperature, it is determined that tar adhesion to the vaporization chamber has progressed, and the fuel supply amount is increased under predetermined conditions to increase the combustion amount. Further, when the temperature decreases, the above operation is repeated to compensate for the decrease in the vaporization ability due to the adhesion of tar. At this time, when the flame rod output falls below the oxygen deficiency detection set value, the number of times of the increase in the amount of combustion is checked, and when the number of times of the increase is equal to or more than a predetermined number, the flame rod output is not reduced due to silicon adhesion. Judge,
The safety is ensured by not changing the oxygen deficiency detection set value.

Further, in the combustion apparatus according to the present invention, the control section changes the set value of oxygen deficiency detection of the combustion confirmation means, and when the output of the temperature detection section becomes equal to or less than a predetermined value, the combustion amount is gradually increased. Is increased, and when the number of times of increase becomes equal to or more than a predetermined number, the set value of oxygen deficiency detection is returned to the initial setting state.

If the temperature of the vaporizing section decreases after changing the set value of oxygen deficiency detection, the set value of oxygen deficiency detection is returned to the initial setting state in accordance with the number of operations of increasing the amount of combustion, so that other than silicon deposition. The accuracy of detection of poor combustion due to the above factors is improved to ensure safety.

Further, in the combustion device according to claim 7, the control unit outputs an alarm signal when the operation for changing the set value of oxygen deficiency detection is being performed.

By notifying the user of the fact that silicon is attached, the maintainability is improved.

[0028]

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

(Embodiment 1) 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. A tank 22 for holding liquid fuel is provided on the inner side of the body case, and a detachable cartridge tank 23 is provided above the tank 22. 24 is a tank 22
Pump installed on the upper surface of
5 is supplied to supply fuel to the combustion unit 26.

Reference numeral 27 denotes a combustion tube for guiding the high-temperature combustion exhaust gas from the combustion section 26 upward, and a blower 28 for taking in and sending out the indoor air flow is disposed at the back thereof. 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. A control device 30 controls the combustion of the combustion unit 26 and the blower 28, and 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). It has become. 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. 32 is a vaporization part,
A circular burner receiving seat 33 is provided at an upper portion thereof, a nozzle 34 is disposed so as to be located substantially at the center of the burner receiving seat 33, and primary air intake for supplying combustion air between the burner receiving seat 33 and the nozzle 34 is provided. An opening 35 is provided, and a cylindrical vaporizing chamber 37 is extended in the outer peripheral direction through a communication port 36 communicating with the nozzle 34 to be 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, the vaporization unit 32
The heater 42 is disposed along the lower surface of the burner receiving seat 33 on the opposite side of the vaporization chamber 37.

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 faces the nozzle 34, and the fuel gas ejected from the nozzle 34 and the fuel gas Is mixed with the primary air sucked by the ejector effect by the ejection of the air. 44 is a burner receiving seat 33 from the upper opening side so as to cover the mixing tube 43.
A number of flame holes 44A are formed in the lower peripheral wall of the cylindrical burner portion which is covered and covered with the upper surface.

Reference numeral 45 denotes an upwardly tapered burner ring attached to the burner receiving seat 33 so as to surround the outer peripheral portion of the flame hole 44A. Reference numeral 46 denotes a heat receiving portion formed in the burner receiving seat 33.

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 section for setting a misfire detection set value for judging that the combustion limit has been exceeded. Reference numeral 50 denotes an acid for judging that an abnormal combustion state has been set to a set value larger than the misfire detection set value. It is an oxygen deficiency detection setting means for setting a missing detection set value. Reference numeral 51 denotes a flame rod output of the combustion detecting section 48, a misfire detection setting section 49, and an oxygen deficiency detection setting section 50.
Is a determination unit that compares the misfire detection set value and the oxygen deficiency detection set value set in the above and outputs a combustion detection signal. These 48 to 51 form combustion confirmation means 52.

Reference numeral 53 denotes a temperature detector provided in the vaporizing section 32 near the nozzle 34 to detect a heat recovery temperature by combustion. 54
Is a temperature detecting section for obtaining temperature information of the vaporizing section 32 based on the signal of the temperature detector 53. Reference numeral 55 denotes a comparison value setting unit that sets a comparison value to be compared with the output of the temperature detection unit 54. Reference numeral 56 compares the comparison value set by the temperature detection unit 54 and the comparison value setting unit 55. When the output is small,
In other words, it is a comparison unit that outputs when the temperature of the vaporization unit 32 falls below a predetermined temperature. Reference numeral 57 denotes a comparison unit 5 when the output of the oxygen deficiency detection is output from the determination unit 51 of the combustion confirmation unit 52.
6 is a setting value change determination unit that changes the oxygen deficiency detection set value by sending a signal to the oxygen deficiency detection setting unit 50 if there is no signal, and controls the combustion operation in 55 to 57. The control unit 58 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 pressure equalization 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, and a flame current flowing between the flame rod 47 and the burner section 44 via a flame is detected by a combustion detection section 48. The determination unit 51 compares this output with the oxygen deficiency detection set value and the misfire detection set value set by the oxygen deficiency detection setting unit 50 and the misfire detection setting unit 49, thereby performing a combustion operation such as poor combustion. To check for changes.

The vaporization of the fuel supplied to the burner section 44 will be described. A vaporizing element 41 in the form of a cylindrical brush is disposed in the vaporizing chamber 37, and the fuel entering the vaporizing chamber 37 is vaporized by touching the inner wall of the vaporizing chamber 37 and the vaporizing element 41 which are kept at a high temperature, and is vaporized. Squirted more. Also, if defective fuel is mixed in at that time, first, the fuel that has entered from the oil supply pipe 25 gradually evaporates in the process of reaching the nozzle 34, and at that time, together with the vaporized gas of the normal fuel. The defective component of the fuel flows straight from the inlet of the vaporization chamber 37 to the nozzle 34 side as an insufficiently vaporized fuel vaporized gas, and on the way, contacts a large number of flocking lines 40 of the vaporization element 41 and is collected as a tar component. Therefore, the vaporized gas that reaches the nozzle 34 does not include the fuel vaporized gas that is insufficiently vaporized, so that the vaporized gas that is 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. Finally, the gas is accumulated in the entire vaporization chamber 37 and becomes clogged, the vaporization ability is reduced, and insufficient vaporization leads to misfire.

For this reason, when the accumulation of tar components affects the combustion state, the temperature detector 53 provided in the vaporizing section 32 judges the temperature drop condition via the temperature detecting section 54 and determines the comparison value. When the temperature becomes equal to or lower than the predetermined temperature set by the setting unit 55, the operation of increasing the amount of fuel supplied from the oil supply pipe 25 under predetermined conditions and increasing the combustion amount is performed. By this operation, the combustion state is recovered, and the combustion can be continued. Then, when the temperature of the vaporizing section 32 decreases again, the above operation is repeated a preset number of times.

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 for increasing the amount of combustion, thereby improving the usability. .

In such a combustion apparatus, when a hair spray or the like containing silicon oil is frequently used in the vicinity thereof, as described in the related art, the silicon oil scattered in the room is mixed with the vaporized gas. Burner part 4
No. 4, and is blown out from the flame port 44A, becomes silicon dioxide by combustion, combines with the oxide film on the surface of the frame rod 47 and accumulates to form an insulating film. Then, although the combustion state is normal, the flame current is reduced, and the combustion is stopped by the oxygen deficiency detection or the misfire detection.

Here, if it is confirmed that the combustion state is normal, if the setting of the oxygen deficiency detection set value to be compared with the flame rod output is changed to a smaller value with the misfire detection set value as a limit, the flame rod 47 It is possible to extend the burning time when silicon adheres to the surface. As shown in FIG. 3, the flame current at the time of silicon deposition, that is, the change state of the flame rod output, gradually changes as the current value decreases, and the oxygen deficiency detection set value is changed to a smaller value. Doing so greatly contributes to prolonging the combustion time.

Therefore, in the present embodiment, a flame current flowing between the flame rod 47 and the burner section 44 disposed so as to face the flame opening 44A of the burner section 44 is taken out as a flame rod output by the combustion detecting section 48, and this output is output. The determination unit 51 determines the oxygen deficiency detection set value set by the oxygen deficiency detection setting unit 50.
When the flame rod output is lower than the oxygen deficiency detection set value, a signal is sent to the set value change determination unit 57 of the control unit 58. When the set value change determination unit 57 receives the oxygen deficiency detection signal, the set value change determination unit 57 determines in advance the temperature of the vaporization unit 32 detected by the temperature detector 53 provided in the vaporization unit 32 near the nozzle 34, that is, the output of the temperature detection unit 54. The comparison with the comparison value set by the comparison value setting unit 55 is performed, and when the output of the temperature detection unit 54 is high, that is, when the temperature of the vaporization unit 32 is equal to or higher than a predetermined temperature, the heat recovery by the combustion heat is performed normally. . That is,
It is determined that the combustion is performed normally, and that the flame rod output is reduced due to the adhesion of silicon as described above. A signal is sent to change the oxygen deficiency detection set value to a smaller value with the misfire detection set value as the lower limit. By this operation, the combustion is continued, and the combustion time is extended.

When the output of the temperature detecting section 54 is low, it means that the heat recovery by the combustion heat is not performed normally, and it is considered that abnormal combustion such as adhesion of tar or lack of oxygen has occurred. Therefore, at this time, the oxygen deficiency detection set value is kept as it is, and the combustion is stopped based on a predetermined sequence to ensure safety.

Next, the combustion device that operates as described above will be described in detail with reference to the flowchart of FIG.

First, combustion is started by the control device 30 based on a predetermined combustion sequence, and the combustion state is monitored by the frame rod 47 disposed at a position facing the flame port 44A. That is, a flame current flowing between the flame rod 47 and the burner section 44 via the flame formed in the flame port 44A is detected by the combustion detection section 48, and the output of the combustion detection section 48 and the setting of the oxygen deficiency detection setting section 50 are set. It is checked whether the combustion state is normal or abnormal by comparing with the set value of oxygen deficiency detection. When the output of the combustion detection unit 54 is high, the combustion state is determined to be normal, and the combustion is continued.

When the output of the combustion detecting section 54 is low, the temperature of the vaporizing section 32 is checked by the temperature detector 53 and the temperature detecting section 54 provided in the vaporizing section 32, and this temperature is compared with the comparison value setting section 55. When the temperature is equal to or lower than the predetermined temperature set in the above, it is determined that the tar component is accumulated in the vaporization chamber 37 and the combustion operation is changed, and the fuel supply amount is increased to perform the combustion amount increasing operation, and an attempt is made to recover the combustion state. . This combustion amount increasing operation is performed at a predetermined number of times or less. If the flame rod output decreases even if the number of times exceeds the specified number, a stop operation is performed.

When the temperature of the vaporizing section 32 is equal to or higher than a predetermined temperature, it is determined that the combustion is also normally performed because the heat recovery is performed normally, and the flame rod output is reduced due to the adhesion of silicon. And changes the oxygen deficiency detection set value to a smaller value. At this time, the value to be changed is set such that the set value of the misfire detection is set at the lower limit, thereby ensuring safety. After the oxygen deficiency detection set value is changed, when the frame rod output falls below the oxygen deficiency detection set value, a stop operation is performed.

When the temperature is higher than the oxygen deficiency detection set value, the temperature of the vaporizing section 32 is checked in the same manner as described above, and when the temperature of the vaporizing section 32 is higher than the predetermined temperature, the combustion is continued. Then, when the temperature of the vaporizing section 32 becomes equal to or lower than a predetermined temperature, the fuel supply amount is increased under a predetermined condition, a combustion amount increasing operation is performed, and an attempt is made to recover the combustion state. This combustion amount increasing operation is performed a predetermined number of times or less, and if the flame rod output decreases even after exceeding the specified number of times, the oxygen deficiency detection set value is returned to the initial setting, and the change in the flame rod output is checked, When the value falls below the oxygen deficiency detection set value, a stop operation is performed.

As described above, when the flame rod output becomes equal to or less than the oxygen deficiency detection set value, the oxygen deficiency detection set value is changed to the misfire detection set value as the lower limit value limit in accordance with the vaporizing section temperature at that time. Thus, it is possible to extend the combustion time in the case of silicon-adhered combustion in which the flame rod output is reduced even though the combustion state is normal, and the usability is greatly improved.

(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 description thereof is omitted.

In the second embodiment, when the flame rod output becomes equal to or less than the oxygen deficiency detection set value and the vaporizing section temperature at that time is equal to or higher than the predetermined temperature, the oxygen deficiency detection set value is reduced to the misfire detection set value, and combustion is detected by the misfire detection. The purpose of this is to further extend the combustion time during the combustion of silicon deposition by stopping the operation. That is, a signal from the set value change determining unit 57 of the control unit 58 is input to the oxygen deficiency detection setting unit 50 and the misfire detection setting unit 49.

In the above configuration, when a signal for detecting lack of oxygen is input from the determination unit 51 of the combustion confirmation unit 52 to the set value change determination unit 57 in the same manner as in the first embodiment, the temperature of the vaporization unit 32 is checked. When the temperature is higher than the temperature set by the comparison value setting unit 55, the set value change determination unit 57 sends signals to the oxygen deficiency detection setting unit 50 and the misfire detection setting unit 49, and the signals are set by the oxygen deficiency detection setting unit 50. The oxygen deficiency detection set value is reduced to the misfire detection set value, and the flame rod output is determined based on the misfire detection set value.

As described above, by performing the combustion detection at the time of misfiring detection at the time of the silicon adhesion combustion, the combustion time can be greatly extended and safety can be 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.

The purpose of the third embodiment is to vary the set value of oxygen deficiency detection before and after the change in accordance with the amount of combustion so that the detection of combustion can be performed with high accuracy without being affected by the amount of combustion. Reference numeral 59 denotes a combustion amount control unit, and an oxygen deficiency detection setting unit 5
0 and a signal are supplied to the misfire detection setting unit 49 and the comparison value setting unit 56 to set the detection setting value according to the combustion amount.

In the above configuration, when a signal for detecting oxygen deficiency is input from the determining unit 51 of the combustion confirming unit 52 to the set value change determining unit 57 as in the first embodiment, the temperature of the vaporizing unit 32 is checked. When the temperature is higher than the temperature set by the comparison value setting unit 55, the set value change determination unit 57 sends signals to the oxygen deficiency detection setting unit 50 and the misfire detection setting unit 49, and the signals are set by the oxygen deficiency detection setting unit 50. The oxygen deficiency detection set value is changed as the misfire detection set value as the lower limit limit, and the frame rod output is determined. And at this time, FIG.
As shown in (a), the oxygen deficiency detection set value and the misfire detection set value are changed in a predetermined relationship in accordance with a change in the combustion amount, and the changed oxygen deficiency detection set value is also changed to the initial setting oxygen deficiency. By making the same change as the detection set value, combustion detection is performed with high accuracy without receiving a change in the combustion amount, and safety is ensured.

In FIG. 7A, the misfire detection set value is changed according to the amount of combustion.
It is also possible to set a fixed value regardless of the amount of combustion as shown in FIG.

(Embodiment 4) The configuration of a combustion apparatus according to Embodiment 4 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 fourth embodiment, when the flame rod output becomes equal to or less than the oxygen deficiency detection set value and the vaporizing section temperature at that time is equal to or higher than the predetermined temperature, the oxygen deficiency detection set value is set to the minimum value of the misfire detection set value within the combustion range. The purpose is to change it as a limit and to further prolong the combustion time during the combustion of silicon deposition.

As shown in FIG. 8 (a), the set value of oxygen deficiency detection at the time of silicon deposition combustion is set at the lower limit of the misfire detection set value of the combustion amount "small" in the combustion range "small" to "large". The misfire detection set value A at the time is changed as a limit. When the changed oxygen deficiency detection set value is lower than the misfire detection set value, the stop operation at the misfire detection set value is stopped, and the stop operation is performed with the changed oxygen deficiency detection set value. In FIG. 8A, the combustion amount is fixed at the lower limit A of the misfire detection set value in the range of “small” to “medium”, and “medium”.
Although the setting value is set so as to be inclined so that it becomes the misfire detection setting value when the combustion amount is "large" in the range of "large", it can be set arbitrarily according to the performance of the combustion device, for example, 8 (b) is also possible.

By the above-mentioned operation, the burning time at the time of sticking and burning of silicon can be further extended, and the usability is greatly improved.

(Embodiment 5) The configuration of a combustion apparatus according to Embodiment 5 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.

The fifth embodiment is intended to improve the maintainability by notifying via the notifying unit 60 when the operation of changing the set value of the oxygen-deficient detection, that is, the state of the silicon adhesion and combustion, is performed.

Reference numeral 60 denotes a notification unit which, when a change signal of the set value of oxygen deficiency detection is sent from the set value change determination unit 57 to the oxygen deficiency detection setting unit 50, notifies the same in synchronization with this signal to notify the same. Notify that it is burning. Thus, accurate maintenance can be performed.

[0070]

As described above, according to the combustion apparatus of the first aspect, when the flame rod output becomes equal to or less than the oxygen deficiency detection set value, the temperature of the vaporization chamber at that time is detected by the temperature detector, In order to check whether the decrease in the frame rod output is due to silicon adhesion, in the case of silicon adhesion, the oxygen deficiency detection set value is changed to the misfire detection set value as the lower limit value, and the combustion time is extended. I have to. That is, when the temperature of the vaporization chamber when the output of the oxygen deficiency detection is issued is equal to or higher than the predetermined temperature, the vaporization of the fuel in the vaporization chamber is normally performed, and the heat recovery from the burner is also normally performed. It is determined that the flame current is not reduced due to tar adhesion or oxygen deficiency, but is due to silicon adhesion to the frame rod, etc., and the oxygen deficiency detection set value is set to be small with the misfire detection set value as the lower limit. To change to the side. By lowering the oxygen deficiency detection set value, the combustion time can be extended to improve the usability, and safety can be ensured by the misfire detection set value.

According to the second aspect of the present invention, when the flame rod output decreases to the set value for detecting oxygen deficiency, and when the temperature of the vaporization chamber at that time is higher than a predetermined temperature, it is determined that silicon deposition is caused. Further, it is possible to extend the combustion time by lowering the oxygen deficiency detection set value to the misfire detection set value and stopping the combustion by the misfire detection.

According to the third aspect of the present invention, in order to correct the flame rod output that changes depending on the amount of combustion,
The set value of oxygen deficiency detection and the set value of misfire detection are varied according to the amount of combustion, and the changed set value of oxygen deficiency detection when it is determined that silicon is attached is also changed to the amount of combustion in the same relationship as the correction at the time of initial setting. Accordingly, it is possible to secure high-precision combustion detection without being affected by the amount of combustion, and to secure safety after changing the oxygen-deficient detection set value.

According to the combustion apparatus of the fourth aspect, the set value of oxygen deficiency detection when it is determined that the cause of the decrease in flame current is silicon adhesion is set to the lower limit value of the set value of misfire detection within the combustion range. It can be changed as a limit and the combustion time can be further extended to improve usability.

Further, according to the combustion apparatus of the fifth aspect, when the temperature of the vaporization chamber falls below the predetermined temperature, it is determined that tar adhesion to the vaporization chamber has progressed, and the fuel supply amount is determined under the predetermined conditions. Increase to increase the amount of combustion. Further, when the temperature decreases, the above operation is repeated to compensate for the decrease in the vaporization ability due to the adhesion of tar. At this time, when the flame rod output falls below the oxygen deficiency detection set value, the number of times of the increase in the amount of combustion is checked, and when the number of times of the increase is equal to or more than a predetermined number, the flame rod output is not reduced due to silicon adhesion. Judgment can be made, and safety can be ensured by not changing the oxygen deficiency detection set value.

According to the combustion apparatus of the sixth aspect, when the temperature of the vaporization chamber decreases after the change of the set value of oxygen deficiency detection, the set value of oxygen deficiency detection is initialized according to the number of operations of increasing the combustion amount. As a result, it is possible to improve the detection accuracy of combustion failure due to factors other than the adhesion of silicon, and to ensure safety.

Further, according to the combustion apparatus of the seventh aspect, it is possible to improve the maintainability by notifying that the silicon is attached.

[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 view showing a change state of a frame rod output 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. 7A is a diagram showing a relationship between combustion detection set values of the apparatus, and FIG. 7B is a diagram showing a relationship between combustion detection set values after the change of the set value.

FIG. 8A is a diagram illustrating a relationship between combustion detection set values of a combustion device according to a fourth embodiment of the present invention; and FIG. 8B is a diagram illustrating a relationship between combustion detection set values of the combustion device after the change of the set values.

FIG. 9 is a block diagram of a combustion device according to a fifth embodiment of the present invention.

FIG. 10 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 52 combustion confirmation means 54 temperature detector 58 controller

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takehiko Shigeoka 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A fuel supply means, a vaporizing section having a vaporizing chamber for vaporizing supplied fuel, a heater for heating the vaporizing section, a nozzle for ejecting gas vaporized by the vaporizing section, and a nozzle A burner section for burning the vaporized gas ejected from the fuel cell, a temperature detecting section for detecting the temperature of the vaporizing section via a temperature detector disposed on the vaporizing section, and a combustion flame disposed near the burner section for combustion. A flame rod that detects the flame current flowing through it, a misfire detection set value that determines that the combustion limit has been exceeded, and an oxygen deficiency detection that determines that an abnormal combustion state has occurred with a set value that is greater than the misfire detection set value A combustion confirmation unit having a set value, and confirming a combustion state from the flame rod output and each of the detection set values; and a control unit that controls a combustion operation with outputs of the temperature detection unit and the combustion confirmation unit, control When detecting lack of oxygen from combustion confirmation means, a combustion apparatus adapted to change the oxygen deficiency detection setting value in accordance with the output of the temperature detecting unit. 2. The control unit checks the output of the temperature detection unit when detecting oxygen deficiency by the combustion confirmation unit, and stops the oxygen deficiency detection operation when the vaporization unit temperature is equal to or higher than a predetermined temperature. 2. The combustion device according to claim 1, wherein the combustion is continued until the flame rod output decreases to the misfire detection set value. 3. The combustion apparatus according to claim 1, wherein the set value of oxygen deficiency detection is changed before and after the change in accordance with the amount of combustion. 4. The control section checks the output of the temperature detection section when an output for detecting oxygen deficiency is issued from the combustion confirmation means.
2. The method according to claim 1, wherein when the temperature of the vaporization section is equal to or higher than a predetermined temperature, the set value of oxygen deficiency detection is changed with a lower limit value of the set value of misfire detection as a limit, and is fixed or varied according to the combustion amount. Combustion equipment. 5. The control unit increases the amount of combustion in a stepwise manner when the output of the temperature detecting unit falls below a predetermined value. 3. The combustion device according to claim 1, wherein the changing operation is not performed. 6. The control unit changes the set value of oxygen deficiency detection of the combustion confirmation means, and when the output of the temperature detection unit becomes equal to or less than a predetermined value, increases the amount of combustion in a stepwise manner. 3. The combustion apparatus according to claim 1, wherein when the number of times exceeds a predetermined number, the set value of oxygen deficiency detection is returned to an initial setting state. 7. The control unit outputs a notification signal when an operation for changing a set value of oxygen deficiency detection is being performed.
7. The combustion device according to any one of claims 6 to 6.