JPH0735898B2 - Flame detector for 2 burner type combustor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a flame detection device for a twisting machine equipped with two burners.

<Prior art and its problems> Conventionally, for example, in a combustor equipped with two gun-type burners, when one burner burns, the combustion chamber becomes brighter, so the flame detector (CdS) on the other burner side
(Flame detector) also shows a bright resistance, and as a result, the flame detector on the non-combustion side, even when its own burner starts combustion,
There was a problem that the flame could not be detected well.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a flame detection device capable of reliably detecting the combustion of each burner in a combustor having two burners.

<Means for Solving the Problems> In order to achieve the above object, the flame detection device for a two-burner type combustor according to the present invention detects a flame for a two-burner type combustor in which a flame detector is provided for each of the two burners. It is a device, and it is a point-in-time fire determination that takes into account the individual fire point determination reference value and the individual fire extinction reference value when used independently for each burner, and the equivalent amount due to the flame of another burner that occurs when other burners are used together. The reference value and the fire extinguishing judgment reference value for combined use are set and stored in advance, and the judgment reference value is independently set according to the presence or absence of combustion of the other burner at the time of judging the presence or absence of combustion of ignition and extinction in each burner. It is characterized in that a control unit is provided which compares the detected value from the flame detector and judges by switching between the one used and the one used together.

<Operation> According to the above feature of the present invention, as the ignition determination standard and the fire extinguishing determination standard for each burner, in addition to providing a single-point fire determination standard value and a single-time extinguishment determination standard value suitable for single use , In consideration of the effect equivalent to other burners, the preset fire judgment reference value for combined use and extinguishing judgment reference value for combined use are set in advance, which is suitable when other burners are used together.
Since this is stored in the control unit, at the time of ignition determination and fire extinguishing determination, the control unit switches and selects the corresponding determination reference value according to the presence / absence of other use of the burner, and the flame is selected. The detected value from the detector is compared. Therefore, not only when the other burners are not burning, but also when the other burners are burning, it is possible to reliably detect the presence or absence of burning of the burner of its own by using the reference value appropriately corresponding to each situation. can do.

<Embodiment> FIG. 1 is an overall configuration diagram of an apparatus for carrying out the present invention, and FIG. 2 is a diagram showing a relationship between a resistance value of a flame detector and a judgment reference resistance value, which are shown with combustion of a burner, and FIG. FIG. 4 is a diagram illustrating a standard for determining the presence or absence of burner combustion based on the resistance indicated by the flame detector.

Two gun type burners for the combustion chamber 11 of the combustion can body 10.
20 and 30 are facing. The first burner 20 and the second burner 30 are respectively provided with jet nozzles 21 and 31 and an ignition igniter 2
2, 32, flame detectors 23, 33, and fuel supply opening / closing valves 24, 34 are provided. Fuel is sent to the ejection nozzles 21 and 31 from a common fuel supply pump 40 via fuel supply on-off valves 24 and 34, respectively. 50 is a blower fan, and 60 is a heat exchanger for hot water supply.

The operation of each unit of the device is controlled by the control unit 70. That is, the control unit 70 has a built-in microcomputer, inputs commands from a remote controller (hereinafter referred to as a remote controller) 80, and signals from the flame detectors 23, 33, etc.
2, 32, fuel supply on-off valves 24, 34, fuel supply pump 40, blower fan 50, etc., to output operation commands.

The combustion is started by a command from the remote controller 80, the igniters 22 and 32 operate via the control unit 70, the fuel supply pump 40 is driven, and the fuel supply on-off valves 24 and 34 are opened. During operation, combustion is performed as needed by the first burner 20.
Or with a second 30 or both burners. The ignition and extinguishing of the first burner 20 is confirmed by the first CdS flame detector 2
This is done by comparing the resistance value from 3 with the judgment reference resistance value. Similarly, the confirmation of ignition and extinction of the second burner 30 is determined by comparing the resistance value from the second flame detector 33 with the determination reference resistance value.

By making sure that the flame detectors 23 and 33 can determine whether ignition or extinguishing is being performed, it is possible to detect the accurate combustion state of the burners 20 and 30, and also to operate the igniters 22, 32 and the fuel supply opening / closing valve.
It is possible to detect failures such as 24 and 34.

Next, the burner combustion presence / absence determining means by the first and second flame detectors 23 and 33 and the control unit 70 will be further described.

First, the first flame detector 23 and the control unit 70 determine whether or not the first burner 20 is burning. Similarly, the combustion of the second burner 30 is performed by the second flame detector 33 and the control unit 70. And the burners 20, 30 by the respective flame detectors 23, 33 and the control unit 70
Whether or not the combustion has occurred is determined for the ignition and extinction of the burners 20 and 30.

In the ignition determination, the control unit 70 stores an ignition determination reference resistance value, which is an ignition determination reference value, in advance, and this value and the flame detector are used.
The judgment is made by comparing the actual resistance values from 23 and 33. In the case of the CdS flame detector, the larger the flame, the smaller the electric resistance. Therefore, it can be determined that the combustion by ignition has started if the resistance is equal to or lower than the ignition determination reference resistance value.

Similarly, in the determination of extinguishing, the control unit 70 stores the extinguishing determination reference resistance value that is the extinguishing determination reference value in advance, and if the detection resistance from the flame detector is equal to or more than the extinguishing determination reference resistance value, it is extinguished. judge.

The ignition determination reference resistance value and the extinguishing determination reference resistance value are determined as follows. Referring to FIGS. 2 and 3, assuming that the resistance is X ₀ when the flame detectors 23 and 33 are not detecting any flames, the flame detectors 23 and 33 can detect the respective resistances. Burner
Kill be determined 20, 30 of the single ignition determination reference value alone ignition criterion抵値X ₂ are experimentally as the X ₀ smaller value. Similarly, the individual fire extinguishing determination reference resistance value X ₁ which is the individual fire extinguishing determination reference value can be experimentally determined as a value smaller than X _{0 and} larger than X ₂ . That is, when the other burners are not burning, it can be determined that the ignition of the burner of its own is determined to be ignition when the reference resistance is X ₂ or less, and the extinguishing determination is determined that the ignition is extinguished when the reference resistance is X ₁ or more (FIG. 3).

Next, when the other burner (for example, the second burner 30) is in a combustion state, in this case, the flame detector (23) of its own burner (for example, the first burner 20) is the other burner (30)). As it is affected by the combustion of the fire, the fire resistance reference value of the fire resistance reference value Y ₂ which is the fire judgment reference value of the co-use point and the fire extinction judgment criterion of the co-use fire extinguishing standard value Determine the resistance value Y ₁ . That is, the first burner 20
Since the resistance of the flame detector (23) already a resistance Y ₀ by the influence of combustion of other burner 30, effects component X ₁ -Y ₀ by obtaining the value Y ₀ experimentally in advance And calculate the impact
The ignition determination reference resistance value Y ₂ and the extinguishing determination reference resistance value Y ₁ are determined by subtracting X ₀ −Y ₀ from the reference resistance values X ₂ and X ₁ , respectively. By determining Y ₂ and Y ₁ in this way, even if another burner is burning, it is possible to reliably determine the ignition and extinction of its own burner.

That is, when the two ignition determination reference resistance values X ₂ and Y ₂ and the two extinguishing determination reference resistance values X ₁ and Y ₁ are stored in the control unit 70 in advance and the other burner is burning. Uses Y ₂ and Y ₁ as criteria for ignition and extinction of its own burner,
Ignition of the own burner is confirmed below Y ₂ and extinction of the own burner is confirmed above Y ₁ (Fig. 3).

In addition, since the judgment criteria when both burners 20, 30 are extinguished simultaneously from the state where both burners 20, 30 are in a combustion state, since it is substantially the same as the extinction when used alone, the extinction criterion resistance value is X. _{Use 1} .

In the above explanation, the flame detector to the other by both burners 20, 30
Although the effects on the burners 23 and 33 have been described as being the same, for example, when the capabilities of the second burner 30 and the capabilities of the first burner 20 are significantly different, the effects of combustion of other burners are also significantly different. Therefore, in this case, each of the reference resistance values X ₁ ,
The values of X ₂ , Y ₁ , Y _2, etc. will also differ for each burner. Of course, even in this case, each value is only determined based on the basic means of eliminating the influence of other burners, and the essence is naturally within the scope of the present invention.

Based on the configuration described above, the determination operation of ignition and extinguishing will be summarized. First, when only one of the burners 20 and 30 is ignited, X ₂ is adopted by the control unit 70 as the ignition determination reference resistance value. . If the resistance value from the flame detectors 23 and 33 on the ignited side is X ₂ or less, it is determined that ignition has been performed.

Next, when only one of the burners 20 and 30 is burning, when extinguishing the burner, based on a fire extinguishing command from the remote controller 80 or the like, the control unit 70 sets X ₁ as the fire extinguishing determination reference value. To adopt. If the resistance value from the flame detector on the burner side that is going to extinguish the fire is X ₁ or more, it is determined that the fire has been extinguished.

Next, when one of the burners has already burned, when igniting the remaining burners, Y ₂ is adopted as the ignition determination reference value in this case, and the flame detector on the burner side that is about to ignite is used. If the resistance value of is less than Y ₂ , it is determined to be ignition.

Then, when one of the burners continues to burn, when extinguishing the other burner from the combustion state, Y ₁ is adopted as the extinction judgment reference value, and the resistance from the flame detector on the burner side to extinguish is If Y ₁ or more, it is judged that the fire has been extinguished.

In the embodiment, the capacity of the second burner 30 is changed to the first burner.
Even if both burners 20 and 30 start burning at the same time, the ignition of the second burner 30 is actually performed a little earlier than the ignition of the first burner 20.
That is, the ignition is substantially performed.

When extinguishing both burners 20 and 30 at the same time, X ₁ is used as the extinction criterion value.

<Effect> The present invention has the above-mentioned configuration and operation, and according to the flame detection device for a two-burner combustor according to claim 1, the presence or absence of combustion of each burner in a combustor equipped with two burners is independently determined. The appropriate standard according to each situation, regardless of the influence of other burners, by the ignition reference value for fire, the reference value for fire extinction when used alone, the reference value for fire when used together and the reference value for fire extinguishing when used together The value can be used to make a reliable determination. Further, by doing so, a failure of the fuel supply opening / closing valve or the like can be detected, and safety can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an apparatus for carrying out the present invention, FIG. 2 is a diagram showing a relationship between a resistance value of a flame detector and a judgment reference resistance value, which are shown with combustion of a burner, and FIG. 3 is a flame detector. It is a figure which shows the reference | standard which determines the presence or absence of burner combustion by the resistance shown. 10: Combustion can body 20: First burner 23: First flame detector 30: Second burner 33: Second flame detector 40: Fuel supply pump 70: Controller

Claims (1)

[Claims] 1. Two burners each equipped with a flame detector.
A flame detection device for a burner type combustor, wherein the single-time fire judgment reference value and the single-time fire extinction judgment reference value when used independently for each burner, and the effect of the flame of the other burner that occurs when other burners are used together The reference value for fire judgment for combined use and the reference value for fire extinguishing for combined use are set and stored in advance. The flame detection of a two-burner type combustor is characterized in that the judgment reference value is switched between the one for single use and the one for combined use, and a control unit for comparing and comparing with the detection value from the flame detector is provided. apparatus.