KR100777238B1 - Igniter electrode monitor for pilot burners - Google Patents

Abstract

The igniter electrode monitoring device of the pilot burner of the present invention, when the ignition mode is selected at the mode selection input unit having the ignition mode and the test mode, high voltage is induced in the igniter electrode gap via the transformer by a logic operation of the control unit. The current detector detects a current applied to the current detector, and the detected current is compared with a current value set in advance in the spark generation range, and when a current flows within the spark generation range, the controller opens the pilot gas valve to ignite the boiler. Is generated, on the other hand, if a current outside the spark generation range flows, the controller is configured to block the high voltage applied to the igniter electrode. In addition, when the test mode is selected, the comparison unit determines whether the detected current is within the spark generation range, and if not, the control unit blocks the high voltage applied to the igniter electrode. When the present invention is used for ignition of the boiler and flare stack, the electrode gap failure of the boiler and flare stack igniter, the disconnection of the cable, the short circuit and the transformer failure are detected in advance when the pilot burner is ignited. Since the voltage is not applied to the electrode and the pilot gas is not introduced into the boiler furnace, there is an advantage of preventing the explosion risk of the gas due to the ignition attempt.

Flare stack, gas purge, by-product gas, pilot burner, ignitor, electrode gap, CT

Description

Pyroburner's igniter electrode monitoring device {THE APPARATUS FOR MONITORING THE IGNITOR ELECTRODE STATE OF PILOT BURNER}

1 is a schematic configuration diagram of a pilot burner and an igniter installed in a conventional boiler (BOILER),

2 is a block diagram of an igniter electrode monitoring device of a pilot burner of the present invention;

Figure 3a is a circuit diagram of an embodiment according to the igniter electrode monitoring device of the present invention pilot burner,

Figure 3b is a schematic diagram of the connection of the current detection unit and the output unit and the pilot burner according to the ignition electrode monitoring device of the present invention pilot burner,

4A is a configuration diagram of a pilot burner for showing an electrode gap according to an igniter electrode monitoring device of a pilot burner of the present invention;

Figure 4b is a graph of the current correlation according to the electrode gap of an embodiment according to the igniter electrode monitoring device of the present invention pilot burner,

5 is an operation flowchart of an embodiment according to the igniter electrode monitoring device of the pilot burner of the present invention.

<Description of the symbols for the main parts of the drawings>

1: IGNITOR 2: PILOT BURNER                 

3: flame detection sensor 4: main burner

5: Boiler body 10: Mode selection input unit

20: current detector 30: current display

40: control unit 41, 42, 46, 47, 48, 49: end gate

43,45: OR gate 44: Timer (T)

50: current adjuster 51A: current upper limit

51B: current lower limit 60: comparator

70: fault indicator 71: fault indicator

80: output unit MC1, MC2: relay

A, B, C: Output display CT: Current detector

The present invention relates to an apparatus for monitoring an igniter electrode of a pilot burner, and more particularly, to discharge a gas of a flare stack that burns dissipation flow rates of a boiler and a by-product gas (BFG.COG) of a steel mill. The test mode that checks the electrode gap of the IGNITOR beforehand and automatically measures and compares and analyzes the igniter electrode gap, and outputs a fault signal when detecting an abnormal signal. An apparatus for monitoring an igniter electrode of a pilot burner having an ignition mode for executing an operation.

In general, the ignition stroke during combustion of the boiler and flare stack means that the main burner is first ignited to a pilot burner (PILOT BURNER: 2) installed inside the boiler main body 5, as shown in FIG. MAIN BURNER: 4) Ignition and burning.

At the time of ignition of the pilot burner 2, the pilot gas valve (PILOT GAS VALVE) 85 is opened by the ignition signal, and at the same time, the high voltage is induced in the igniter 1, and an ignition is attempted.

The ignition check is performed by the flame sensor 3 to determine the state of ignition. In the ignition method of the conventional pilot burner, the ignition failure due to the poor spark generation of the igniter 1 is performed. There is a problem that there is a risk of explosion due to excessive pilot gas in the boiler furnace because it is not detected in advance.

In addition, in order to re-ignite the gas purge (GAS PURGE) work in the boiler furnace, in this case there was a problem that takes a long time to re-ignite.

In addition, in order to check whether the igniter 1 installed in the pilot burner 2 is normally operated, there is a problem in that the pilot burner 2 and the igniter 1 should be taken out and checked.

The present invention has been made to solve the above problems, when the driver or the operator selects the test mode and the ignition mode and inputs to the control unit during the ignition of the pilot burner, according to the input mode, the actual current input through the current detector The comparator compares and judges the value and the good current set value detected in the event of the ignition spark, and when a certain signal according to the comparison judgment is input to the controller, it displays a fault indication and an ignition signal through the fault display part and the output part, The purpose is to provide an igniter electrode monitoring device for a pilot burner that controls the final flame ignition of the lot burner.

The igniter electrode monitoring device of the pilot burner of the present invention is a device for monitoring the igniter electrode during ignition of the boiler and the flare stack pilot burner,

A mode selection input unit 10 having an ignition mode set to cause spark ignition on the pilot burner 2 and a test mode set to inspect an electrode gap state of the igniter 1;

The current detector 20 detects the primary current of the transformer applying the high voltage to the igniter 1 by driving the relay MC1 and the ON operation of the contact MC1-a, and the current display unit 30 displaying the intensity of the detected current. )Wow;

An igniter 1 and a current adjusting unit 50 for adjusting and setting a current corresponding to a spark generation range of the electrode gap;

A comparator 60 for comparing the current set by the current adjuster 50 with the current detected by the current detector 20 for a predetermined time of the timer T and outputting a comparison signal to the controller 40;

When the ignition mode is input, the relay MC1 of the output unit 80 is driven so that a high voltage is applied to the igniter 1 through the transformer, and if the detected current is within the spark generation range through the comparator 60, After the predetermined time has elapsed, the pilot gas valve 85 is opened by driving the relay MC2 of the output unit 80 by turning on the timer T. If the flame is out of the spark generation range, the timer T is turned on after the predetermined time elapses. In addition, the relay MC1 is turned off at the same time as the fault output, and when the test mode is input, the relay MC1 is driven so that a high voltage is applied to the igniter 1, and the detected current is compared with the comparator 60. A control unit 40 configured to element the relay MC1 at the same time as the failure output by the ON operation of the timer T after a predetermined time elapses if the flame is out of the range;

A failure display unit 70 which displays a failure by the ON operation of the timer T after a predetermined time has elapsed if the current detected by being connected to the control unit 40 is outside the spark generation range through the comparison unit 60;

The relays MC1 and MC2 are driven in accordance with the logic signal output of the controller 40 so that the contacts MC1-a and MC2-a operate on / off, thereby applying a high voltage to the igniter 1 or a pilot gas valve 85. It is characterized in that it comprises an output unit 80 for controlling the spark ignition of the burner by adjusting the).

In addition, the igniter electrode monitoring device of the pilot burner of the present invention, when the controller 40 is satisfied in the ignition mode, the external condition is satisfied, the ignition operation signal is applied, and the low signal is input to the fault display unit 70 (high) AND gate 41 outputting a high direct signal, and an AND gate outputting a high signal when a LOW signal is applied to the fault display unit 70 when an igniter operation signal is applied in a test mode. 42 is connected to the oragate 43, the timer (T) is connected to the oragate 43 to be turned on after a predetermined time,

The other OA gate 45 is connected to the comparator 60 so that a low signal is output when the igniter electrode is normal. When an abnormality occurs in the igniter electrode and the timer T is turned on, the fault display unit ( 70 is ANDed with a timer T to an AND gate 46 that outputs a high signal to be operated,

The AND gate 48 connected to the relay MC1 outputs a high signal for a predetermined time of the timer T. When the timer T is turned on after a predetermined time elapses and the electrode is abnormal, the AND gate 48 outputs a low signal. 43) and end gate 46,

The AND gate 47 is connected to the timer T and the AND gate 46 to output a high signal when the electrode is normal and the timer T is turned on, and the AND gate 47 is connected to the relay MC2 together with the AND gate 41. And gated to the gate 49.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of an embodiment according to the igniter electrode monitoring device of the present invention pilot burner.

Figure 2 is a block diagram of the igniter electrode monitoring device of the pilot burner of the present invention.

As shown, the present invention is provided with an ignition mode and a test mode as a whole, connecting the control unit 40 to the mode selection input unit 10 for inputting the mode selection, and detecting a load current flowing through the igniter 1. The current display unit 30 is connected to the current detection unit 20 so as to install the detection unit 20 and display the detected current.

In addition, the comparison unit 60 is connected to the current detector 20 and the current adjuster 50 having a predetermined current set to compare the actual measured current value with the set current value so that a control signal is applied to the controller 40. It is composed.

In addition, the controller 60 is configured such that a failure display unit 70 for indicating a failure is connected when an abnormality is determined in the electrode gap of the igniter 1, and is driven by a relay driving according to the output of the controller 60. The output unit 80 which operates the rotor 1 and the pilot gas valve 85 to generate the spark ignition of the pilot burner 2 is configured to be connected.

Figure 3a is a detailed circuit diagram of a preferred embodiment according to the igniter electrode monitoring device of the pilot burner of the present invention, Figure 3b is an output unit and igniter load current connected to the pilot burner and the igniter to detect This is a connection diagram of the current detector.

As shown in FIG. 3, the mode selection input unit 10 receives a signal differently from the ignition mode and the test mode to the control unit 40. As an input switch, the ignition operation switch 11, the external condition switch 12, The mode selection switch 13 and the igniter operation switch 14 are provided.

As shown in FIG. 3B, the current detecting unit 20 is provided between an AC power supplying power to the igniter 1 and a primary side of a transformer Tr that converts it to a high voltage and applies the igniter 1 to the igniter 1. It consists of installing a current transformer (CT) in the In this embodiment, the transformer is set to AC 110/10000 V, 200 VA.

The current display unit 30 is configured to connect the current indicator 31 to the output side of the current detection unit 20, and the current adjustment unit 50 is provided with a current setting circuit (51, 52) to cause the spark ignition well The rotor 1 is configured to set a constant current corresponding to the electrode gap. The current setting circuit 51 sets the upper limit of the normal current, and the other current setting circuit 52 sets the lower limit.

The comparison unit 60 compares the detection current of the current detection unit 20 with the current upper limit value set by the current adjusting unit 50, and detects the comparison circuit 61 outputting a high signal when the detection current is larger than the set upper limit value. When the current is smaller than the set lower limit value, the comparison circuit 62 outputs a high signal.

The control unit 40 has an ignition operation switch 11, an external condition switch 12, a mode selection switch 13 located in an ignition mode, and a Not gate that reverses a signal input to the failure display unit 70, respectively. The AND gate 41 is connected to the AND gate 41, and the mode selection switch 13 positioned in the test mode, and the NOT gate and the igniter operation switch 14 that signal the signal input to the failure display unit 70 are reduced. Configure the connection to end at).

The AND gates 41 and 42 are connected to an input terminal of the oragate 43, respectively, and the on delay timer T is connected to the oragate 43 so as to be operated after a predetermined time.

The outputs of the comparison circuits 61 and 62 of the comparator 60 are connected to the other oragate 45, respectively, and the timer T and the oragate 45 are connected to the AND gate 46. The AND gate 46 is connected to a nat gate to connect the oragate 43 to an AND gate 48 connected to the relay MC1.

The output terminal of the AND gate 46 is connected to the fault display unit 70, and the output of the AND gate 46 is nated to connect to the AND gate 47 together with the timer T. In addition, the output of the AND gate 46 may be nated to be connected to the AND gates 41 and 42, respectively.

The AND gates 41 and 47 are connected to the AND gate 49 connected to the relay MC2.                     

The fault display unit 70 is provided with a fault indicator light 71 and is connected to the output terminal of the end gate 46 so that an indicator light turns on when a high signal is output from the AND gate 46.

As shown in FIGS. 3A and 3B, the output unit 80 is driven by the relay MC1 connected to the AND gate 48 to operate the relay contact MC1-a installed at the primary side of the transformer, thereby causing the transformer to high voltage. It is configured to apply to the rotor (1), the relay MC2 connected to the AND gate 49 is configured to drive the pilot gas valve 85 is opened by the ON operation of the relay contact MC2-a.

With reference to the drawings will be described in detail the operation of the embodiment according to the igniter electrode monitoring device of the present invention pilot burner.

Figure 4a shows the electrode gap of the igniter and Figure 4b is a graph showing the strength of the current according to the electrode gap.

As shown in Fig. 4A, at the time of ignition of the pilot burner 2, an arc (ARC) generated between the electrodes by applying a high voltage to the transformer to the igniter 1 provided at the nozzle of the pilot burner 2 is applied. Generates a spark

At this time, the current of the transformer changes in accordance with the distance between the igniter 1 electrode gap GAP and the current change graph as shown in the graph of the current change.

That is, when the electrode gap of the igniter 1 becomes wider, the current value on the transformer primary side becomes smaller, and when the electrode gap is out of the spark generation range or disconnection occurs, the current is hardly detected.

On the contrary, when the gap of the electrode is narrowed, spark generation occurs weakly, the current value rises, and the gap of the electrode is narrowed, and the short circuit current of the transformer is detected at the time of short circuit.

Therefore, the operation principle of the present invention constitutes a current detector CT on the primary side of the transformer of the igniter 1, detects the primary current of the transformer generated during the operation of the igniter 1, and generates a good flame. When the current value is set and the detected current of the current detector 20 is compared by the comparator 60, when the current upper and lower limit values 51A and 51B are outside the normal range, the electrode gap of the igniter 1 is defective or disconnected. In this case, the output of the pilot gas valve 85 and the igniter 1 is controlled.

In the present embodiment, when the current range detected by the current detector 20 is within 0.7A to 1.15A, a good spark is generated in the electrode gap, and the measurement data of the electrode gap and the detection current is obtained and shown in FIG. 4B.

Since the operation is divided into the ignition mode and the test mode according to the input mode of the mode selection input unit 10 will be described first with reference to the circuit diagram of Figure 3 and the operation flow diagram of FIG.

When the initial condition of the boiler, that is, the condition in which the boiler is operated, for example, an external condition such as temperature and pressure is satisfied, the external condition switch 12 is automatically turned on, and the mode selection switch 13 is set to the ignition mode (OPERATION MODE). To the left and the ignition switch 11 is turned on. At this time, since the AND gate 46 of the controller 40 is in a low state, a high logic signal is applied through the sick gate.

Therefore, when the AND gate 41 is turned on and the logic output signal becomes high and is input to the OR gate 43, the ON delay timer T (ON DELAY TIMER) starts counting at the logic output. In this embodiment, the timer T is turned on after counting for about 3 seconds.

While the timer T counts, the AND gate 48 is turned on to the low output of the AND gate 46 to drive the magnetic relay MC1 for the igniter power supply, and the contact MC1-a is turned on to supply power to the transformer. Therefore, a high voltage is induced in the electrode gap of the igniter 1, and sparks are generated.

At this time, the current detection unit 20 provided on the primary side of the transformer detects a current, and the detected current is input as a current detection signal of the comparator 60.

The comparator 60 inputs a lower limit value at 1.15A, where the input current value is an appropriate flame generation range (here, the proper flame generation range is an upper limit value 51A of the electrode gap of the igniter 1 of FIG. 4B) and the current value. 51B) is set within 0.7 A. However, depending on the equipment condition, the upper and lower set values can be changed. The comparison is judged while the timer T is counting. If the value is larger than the set upper limit value 1.15A, a high signal is outputted. The comparison circuit 62 outputs a high signal if the detected current value is smaller than the set lower limit value 0.7A.

Therefore, if the detected current is out of the spark generation range, the oragate 45 is turned on and the logic output becomes high. When the timer T is turned on after 3 seconds, the fault display unit 70 is connected through the logic output of the AND gate 46. Fault indicator 71 lights up.

On the other hand, since the AND gate 48 is turned off and the low state is output, the relay MC1 is turned off and the contact MC-a is turned off to cut off the power input to the transformer of the ignitor.

At this time, since the AND gate 47 is turned off and the AND gate 49 is turned off due to the low logic signal, the magnet relay MC2 for operating the pilot gas valve 85 is elemented, so that the pilot burner gas is discharged into the boiler. It is in a state not to do.

On the other hand, if the comparison unit 60 detects that the detected current value is within the appropriate spark generation range which is a user set range, and there is no abnormality, the oragate 45 is turned off and after 3 seconds the timer T is turned on. The AND gate 46 is turned off so that the failure indicator 71 is turned off.

The AND gates 47, 48, and 49 are turned on, respectively, and the relay MC1 connected to the AND gate 48 is continuously driven so that a high voltage is applied to the igniter electrode gap and a spark is maintained. In addition, since the relay MC2 connected to the AND gate 49 is also driven and the contact MC-a is turned on, the pilot gas valve 85 is opened, and gas is ejected to the pilot burner 2 to ignite by an igniter flame. Get up.

That is, in the ignition mode, while the timer T counts the current value of the igniter 1 in the comparison circuits 61 and 62 of the comparator 60 for three seconds, Comparing with the set value, it is determined that the relay MC2 is driven only when it is normal, so that the pilot gas valve 85 is opened and the gas is supplied into the boiler to ignite by the igniter operation.

Hereinafter, the case of the test mode will be described.

When the mode selection switch 13 is switched to the test mode and the igniter operation switch 14 is turned on, the AND gate 42 is turned on to apply the high logic signal to the oragate 43. When the orgator 43 outputs a high signal to the timer T, the timer T starts counting.

While the timer T is counting, the high signal of the or gate 43 and the low signal of the AND gate 46 are inverted to a high signal by the knock gate, and the AND gate 48 is turned on, and the high signal is applied to the relay MC1. do.

The relay MC1 is excited and driven, and its contact MC1-a is turned on so that a high voltage is applied to the electrode gap of the igniter 1 through the transformer.

At this time, the current detected by the current detector 20 on the primary side of the igniter 1 is input to the comparator 60, and the current applied from the comparator circuits 61 and 62 of the comparator 60 is set. The application is made within the current upper limit value 51A and the current lower limit value 51B within the spark generation range.

If the detected current is out of the spark generation range, it is determined that the spark generation of the igniter electrode is poor, the oragate 45 is turned on, and the timer T is turned on after 3 seconds, and the AND gate 46 is turned on.

Accordingly, the fault display unit 70 is turned on and the igniter operation AND gate 48 is turned off to output a low logic signal, thereby relaying the MC1. Therefore, the contact MC-a is turned off to block the operation of the igniter 1.

When the detected current is within the spark generation range, the voltage is induced to the igniter electrode by the relay MC1 to generate a spark. Of course, in the test mode, since the relay driving end gate 49 is turned off by the low output of the end gate 41, the pilot gas valve 85 is kept closed.

On the other hand, when the current detected from the primary side of the transformer for the igniter is displayed on the A-METER 101 by the current display unit 30 having the current indicator 31, the user sees the current value and the state of the igniter electrode gap. It is possible to check the disconnection and short circuit.

In the test mode, when the electrode gap of the igniter is confirmed to be good, the ignition mode is activated to ignite the pilot burner to start the boiler.

FIG. 5 illustrates a flow in which an embodiment of the igniter electrode monitoring device of the pilot burner according to the present invention is operated, and a detailed operation flow thereof is omitted in the description of FIG.

The present invention is not limited to the above embodiments, but through the configuration of logic circuits of the mode selection input unit, the comparison unit, the control unit, or the like, within the scope of the technical idea of the specification, drawings, and claims of the present invention, or the variation of the spark generation range. Various modifications may be made to those skilled in the art.

When the present invention acting as described above is used for ignition of the boiler and flare stack, the electrode gap failure of the boiler and flare stack igniter and the disconnection of the cable, short circuit, transformer failure, etc., during ignition of the pilot burner are preliminary. Since the voltage is not applied to the igniter electrode and the pilot gas is not introduced into the boiler furnace, there is an advantage of preventing the explosion of the gas due to the ignition attempt.                     

In addition, in the conventional case, by eliminating the gas purge operation to remove the gas injected into the furnace for re-ignition in case of miss fire, the re-ignition time can be shortened, which is stable in all steelworks lines. By supplying steam, there is an advantage to improve the facility operation rate.

In addition, by automatically checking the primary load current of the transformer generated during the operation of the igniter, it is possible to check whether the igniter electrode gap is good without removing the pilot burner and the igniter, thereby reducing maintenance costs. .

In addition, the by-product gas of the flare stack dissipation flow rate is not discharged, which may contribute to preventing environmental pollution.

Claims (2)

A device for monitoring igniter electrodes during ignition of boilers and flare stack pilot burners, A mode selection input unit 10 having an ignition mode set to cause spark ignition on the pilot burner 2 and a test mode set to inspect an electrode gap state of the igniter 1; The current detector 20 detects the primary current of the transformer applying the high voltage to the igniter 1 by driving the relay MC1 and the ON operation of the contact MC1-a, and the current display unit 30 displaying the intensity of the detected current. )Wow; An igniter 1 and a current adjusting unit 50 for adjusting and setting a current corresponding to a spark generation range of the electrode gap; A comparator 60 for comparing the current set by the current adjuster 50 with the current detected by the current detector 20 for a predetermined time of the timer T and outputting a comparison signal to the controller 40; When the ignition mode is input, the relay MC1 of the output unit 80 is driven so that a high voltage is applied to the igniter 1 through the transformer, and if the detected current is within the spark generation range through the comparator 60, After the predetermined time has elapsed, the pilot gas valve 85 is opened by driving the relay MC2 of the output unit 80 by turning on the timer T. If the flame is out of the spark generation range, the timer T is turned on after the predetermined time elapses. When the test mode is input, when the test mode is input, the high voltage is applied to the igniter 1 and the detected current is compared to the comparator 60. A control unit 40 configured to element the relay MC1 at the same time as the failure output by the ON operation of the timer T after a predetermined time elapses if the flame is out of the range; A failure display unit 70 which displays a failure by the ON operation of the timer T after a predetermined time has elapsed if the current detected by being connected to the control unit 40 is outside the spark generation range through the comparison unit 60; The relays MC1 and MC2 are driven in accordance with the logic signal output of the controller 40 so that the contacts MC1-a and MC2-a operate on / off, thereby applying a high voltage to the igniter 1 or a pilot gas valve 85. Igniter electrode monitoring device of the pyro burner, characterized in that it comprises an output unit (80) for controlling the spark ignition of the burner by adjusting. The AND of claim 1, wherein the controller 40 outputs a high direct signal when an external condition is satisfied in the ignition mode, an ignition operation signal is applied, and a low signal is input to the fault display unit 70. When the gate 41 and the test mode in the test mode are applied and the low signal is applied to the fault display unit 70, the AND gate 42 which outputs a high signal is the ora gate 43. Is connected to the oA gate 43 so that the timer T is turned on after a predetermined time, The other OA gate 45 is connected to the comparator 60 so that a low signal is output when the igniter electrode is normal. When the igniter electrode has an abnormality and the timer T is on, the fault display unit 70 Is coupled with the timer T to the AND gate 46 which outputs a high signal so that The AND gate 48 connected to the relay MC1 outputs a high signal for a predetermined time of the timer T. When the timer T is turned on after a predetermined time elapses and the electrode is abnormal, the AND gate 48 outputs a low signal. 43) and end gate 46, The AND gate 47 is connected to the timer T and the AND gate 46 to output a high signal when the electrode is normal and the timer T is turned on, and the AND gate 47 is connected to the relay MC2 together with the AND gate 41. An igniter electrode monitoring device of a pilot burner, characterized in that it is connected to the gate (49).

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