JPH049512A - Flame detecting apparatus in two burner combustion machine - Google Patents

Abstract

PURPOSE:To securely detect the existence of the burning of a burner in itself by constructing flame detectors such that a decision reference value is altered by a value corresponding to the influence of the existence of burning of another burner. CONSTITUTION:Flame detectors 23, 33 detect whether or not burners 20, 30 burn, respectively. Ignition is decided by previously storing an ignition decision reference resistance in a control part 70 and comparing said resistance with actual one from the flame detectors 23, 33. In the case of a CdS flame detector electric resistance is decreased as a flame is greater, so that burning by the ignition is decided to be initiated provided the ignition decision reference resistance or less is attained. Likewise, for the decision of extinction decision reference resistance is stored beforehand in the control part 70, and extinction is decided to occur provided detected resistance from the flame detector is the extinction decision reference resistance or less. Thus, the ignition or extinction of a burner of itself can be decided without fail even though another burner is burned.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a flame detection device for a combustor equipped with two burners.

<Prior art and its problems> Conventionally, for example, in a combustion machine equipped with two gun-type burners, when one burner burns, the inside of the combustion chamber becomes bright.
S flame detector) also showed bright resistance, and as a result, there was a problem in that the flame detector on the non-combustion side could not detect flame well even when its own burner started combustion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a flame detection device capable of reliably detecting the presence or absence of combustion in each burner in a combustion machine equipped with two burners, by eliminating the drawbacks of the prior art described above.

<Means for Solving the Problems> In order to achieve the above object, the flame detection device for a two-burner type combustion machine of the present invention provides a flame detection device for a two-burner type combustion machine in which each of the two burners is provided with a flame detector. The apparatus is configured such that each flame detector determines whether or not its own burner is burning, by changing the determination reference value by a value corresponding to the influence of the flame detector, depending on whether or not the other burner is burning. It is characterized by

<Operation> According to the above features of the present invention, it is possible to determine whether or not one burner is burning, depending on whether or not the other burner is burning, in a manner that eliminates the influence of combustion by the other burner. In other words, the configuration is such that the judgment reference value for flame detection of the own burner is changed depending on two conditions: when the other burner is burning and when it is not burning.
It is possible to reliably detect whether or not the own burner is burning, not only when other burners are not burning, but also when other burners are burning.

<Example> Fig. 1 is an overall configuration diagram of an apparatus implementing the present invention, Fig. 2 is a diagram showing the relationship between the resistance value of the flame detector and the judgment reference resistance value shown as the burner burns, and Fig. 3. FIG. 2 is a diagram illustrating a criterion for determining the presence or absence of burner combustion based on the resistance indicated by a flame detector.

Two gun-type burners 20, 30 face the combustion chamber 11 of the combustion can body 10. The first burner 20 and the second burner 30 are each provided with a jet nozzle 21.31, an igniter 22.32, a flame detector 23.33, and a fuel supply on/off valve 24.34. Fuel is sent to each jet nozzle 21.31 from a common fuel supply pump 40 via a fuel supply on-off valve 24.34, respectively. 50 is a blower fan, and 60 is a heat exchanger for hot water supply.

The operation of each part of the device is controlled by a control section 70. That is, the control unit 70 has a built-in microcomputer, inputs commands from a remote controller (hereinafter referred to as remote control) 80, and signals from flame detectors 23, 33, etc.
Operation commands are output to the igniter 22.32, fuel supply on/off valve 24.34, fuel supply pump 40, ventilation fan 50, etc.

The start of combustion is initiated by the control section 7 in response to a command from the remote controller 80.
0, the igniter 22.32 is activated, the fuel supply pump 40 is activated, and the fuel supply on/off valve 24.34 is opened. During operation, combustion takes place in the first burner 20 or the second 30 or both burners as required. Ignition and extinguishment of the first burner 20 are confirmed by comparing the resistance value from the first CdS flame detector 23 with the determination reference resistance value. Similarly, whether the second burner 30 is ignited or extinguished is determined by comparing the resistance value from the second flame detector 33 with the determination reference resistance value.

Since the flame detector 23.33 can reliably determine ignition and extinguishment, it is possible to accurately detect the combustion state of the burner 20.30, and also prevent malfunctions of the igniter 22.32 and the fuel supply on/off valve 24.34. can be detected.

Next, ff! of burner combustion by the first and second flame detectors 23.33 and the control unit 70! ! The A determination means will be further explained.

First, the first flame detector 23 and the control section 70 determine whether or not the first burner 20 is burning. Similarly, the presence or absence of combustion in the second burner 30 is determined by the second flame detector 33 and the control unit 70. The determination by each flame detector 23.33 and the control unit 70 as to whether or not the burner 20.30 is burning is made after the burner 20.30 is ignited and extinguished.

Ignition is determined by storing an ignition determination reference resistance value, which is an ignition determination reference value, in advance in the control unit 70, and comparing this value with the actual resistance value from the flame detector 23.33. . In the case of a CdS flame detector, the larger the flame, the smaller the electrical resistance, so if the resistance is below the ignition determination reference value, it can be determined that combustion by ignition has started.

Similarly, when determining whether to extinguish a fire, a fire extinguishing determination reference resistance value, which is a fire extinguishing determination reference value, is stored in advance in the control unit 70, and if the detected resistance from the flame detector is equal to or greater than the extinguishing determination reference resistance value, the fire is determined to have been extinguished. judge.

The ignition judgment reference resistance value and the extinguishing judgment reference resistance value are determined as follows. Referring to FIGS. 2 and 3, the resistance in the state where the flame detector 23.33 is not detecting any flame is x. Then, the independent ignition judgment base '$ resistance value X2 of each burner 20.30 by each of these flame detectors 23.33 is the above-mentioned X. It can be determined experimentally as a smaller value. Similarly, the independent fire extinguishing criterion resistance value X can be experimentally determined as a value smaller than X0 and larger than X2. In other words, when other burners are not burning, the ignition judgment of the own burner is based on the reference resistance
Ignition can be determined as below, and extinguishment can be determined as extinguishing when the reference resistance is greater than or equal to the reference resistance X8 (Fig. 3).

Then, if the other burner (e.g. the second burner 30) is in the firing state, then in this case the own burner (e.g. the first
The flame detector (23) of one burner (20) is connected to the other burner (30).
), the ignition judgment reference resistance value Y2 and the extinguishment judgment reference resistance value Y1 are determined so as to eliminate this effect. In other words, since the resistance value of the flame detector (23) of the first burner 20 has already become a resistance of Yo due to the influence of the combustion of the other burners 30, the influence can be calculated by obtaining the value Y0 experimentally in advance. X, -Y, and by subtracting this influence XoYo from the reference resistance (J By determining Y2 and Y as such, even if other burners are burning, it is possible to reliably determine whether to ignite or extinguish the own burner.

That is, the two ignition criteria resistance values X2, Y2 and the two extinguishing criteria resistance values X1, Yl are stored in advance in the control unit 70, and when the other burner is burning, the own Y2 as a criterion for igniting and extinguishing the burner
, Yl, check that your own burner is ignited at Y2 or lower, and check that your own burner is extinguished at 77 or higher (Figure 3).
.

Note that the criterion for extinguishing both burners 20.30 at the same time from a state where both burners 20.30 are in a combustion state is substantially the same as for extinguishing when used alone, so X is used as the extinguishment criterion resistance value. , is used.

In the above explanation, the influence of both burners 20.30 on the flame detector 23.33 on the other burner is the same, but for example, when the capacity of the second burner 30 and the capacity of the first burner 20 are significantly different, The effects of combustion in other burners also vary considerably. Therefore, in this case, the reference resistance values X+, Xz, Y, , Y.

The values of etc. will also differ from burner to burner. Of course, even in this case, each value is simply determined based on the basic method of eliminating the influence of other burners, and the quality of the wood is naturally within the scope of the present invention.

Based on the configuration described above, the ignition and extinguishment determination functions are summarized as follows: First, when only one of the burners 20 and 30 is to be ignited, the ignition determination criterion j1! The control unit 7 uses X2 as the resistance value.
Adopt with 0. and a flame detector 23.3 on the side to be ignited.
If the resistance value from No. 3 is less than or equal to X2, it is determined that ignition has occurred.

Next, when only one of the burners 20 and 30 is burning, if you want to extinguish that burner, use the remote control 8
Based on the extinguishing command from 0, etc., the control unit 70 adopts Xl as the extinguishing determination reference value. If the resistance value from the flame detector on the side of the burner to be extinguished is X1 or more, it is determined that the extinguishment is to be extinguished.

Next, if one of the burners is already burning and you want to ignite the remaining burner, in this case Y2 is adopted as the ignition judgment reference value, and the value from the flame detector on the burner side to be ignited is used. If the resistance value is less than or equal to Y2, it is determined that ignition has occurred.

If one of the burners continues to burn, and the other burner is extinguished from the combustion state, Y is used as the extinguishing judgment reference value, and the resistance from the flame detector on the side of the burner to be extinguished is If it is 73 or more, it is determined that the fire has been extinguished.

In addition, in the embodiment, the capacity of the second burner 30 is made slightly larger than the capacity of the first burner 20, and both burners 20
．． 30 at the same time, the second burner 30 is actually ignited a little earlier than the first burner 20. That is, in effect, independent ignition is performed.

In addition, when extinguishing both burners 20.30 at the same time, Xl is adopted as the extinguishing criterion resistance value.

Effect> The present invention has the above configuration and operation, and according to the flame detection device for a two-burner type combustion machine according to claim 1, the presence or absence of combustion in each burner in a combustion machine equipped with two burners can be detected by detecting the presence or absence of combustion in each burner in the other burner. Reliable detection is possible regardless of whether there is any influence from the burner. Furthermore, it is also possible to detect failures in the fuel supply on-off valve, etc., thereby improving safety.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of the apparatus implementing the present invention, Fig. 2 is a diagram showing the relationship between the resistance value of the flame detector and the judgment reference resistance value as the burner burns, and Fig. 3 is the diagram of the flame detector. FIG. 3 is a diagram illustrating a standard for determining whether or not burner combustion is occurring based on the resistance shown in FIG. IO = combustion canister 20: first burner 23: 30: 33: 40 near 0: first flame detector second burner second flame detector fuel supply pump control section

Claims (1)

[Claims] (1) A flame detection device for a two-burner combustion machine in which each of the two burners is equipped with a flame detector, and each flame detector determines whether or not its own burner is burning depending on whether or not the other burner is burning. A flame detection device for a two-burner combustion machine, characterized in that the determination reference value is changed by a value corresponding to the influence accordingly.