SU1539471A1 - Device for automatic control of the starting of a burner - Google Patents

Abstract

The invention relates to a power system and can be used to automatically control the ignition of a burner (RG), for example, a heat unit operating on liquid fuel, for drying peat in a fluidized bed. The invention makes it possible to increase the reliability of the RG by introducing a re-ignition pilot ignition (RE), which is carried out in the event that the first ignition does not take place. The control of the absence of the RE is carried out using a flame control sensor and control circuit (SU). This control system allows the execution of re-RH if the first has not occurred. In the event that the initial RH has occurred, the CS will return to the initial state. In this case, self-control of the serviceability of elements of the control system and control over the presence of the flame is carried out. 4 il.

Description

The invention relates to a power system, in particular, to automatic control systems for fuel burners of heat-generating units, for example, a heating-drying unit with a fluidized bed for drying peat.

The purpose of the invention is to increase the reliability of automatic control of the ignition of a burner equipped with a fuel pump and an electric motor.

Fig. 1 shows a block diagram of an automatic ignition control device for the burner, Fig. 2 shows voltage diagrams on the elements of the device in case of successful ignition of the burner; in fig. 3 - the same, in the case when the first ignition of the igniter did not take place, in FIG. 4 - the same, in the case when the first and second ignition of the igniter did not occur.

The device contains a burner 1 and a pilot light 2, to which the air supply line 3 is connected, the fuel valve 4 of the burner and the fuel valve 5 of the igniter,

a safety valve 6 and a fuel pump 7 supplying fuel to line 8, the actuator 9 of the fuel valve 4 of the burner 1, the actuator 10 of the fuel valve 5 of the pilot 2, led. 11 of the fuel pump, the first 12, the second 13, the third 14 and the fourth 15 power silica gel, forming a gel 16 command generator 17 impulses. sparking unit 18. high-voltage ignition electrode 19 of the igniter, flame control sensor 20, signal unit 21, first 22, second 23, third 24 and fourth 25 triggers, first 26. second 27 and third 28 elements OR NOT, first 29 and second 30 elements OR, first 31, second 32, third 33, fourth 34 and fifth 35 elements AND, first 36, second 37, third 38 NOT elements, first 39 and second 40 counters, burner fuel valve position sensor 41, shaper 42 Stop and one-shot 43

FIG. 2 is a stress chart of the elements of the structure when

and.

OQ WITH

N & fe

the first ignition of the igniter 2 and then the ignition to keep track of the counters 39 and 40, and the input of the burner 1 took place; in fig. 3 - when the generator 17, which produces a pulse, the first ignition of the igniter 2 did not take place, the sy of the specified duration, for example, m and the ignition of the burner 1 occurred after 0.5-1.5 seconds. After the arrival of the first torch launch of the igniter 2, in FIG. 4 - from the pulse to the input of the counter 39 at its first when the first and second ignitions are fired, a pulse "1" is formed, which

And at the first input of the element 33, the signal “1 is already present from the sensor 41. From the output of the element 33, the signal“ 1 enters the sonic 2 did not take place and the burner 1 was not ignited.

In figures 2, 3, 4 shows the following dependencies:

. U. - dependence, describing the work of the 10 th input of the trigger 23, which switch-generator 17;

Ui, 1) 2, Us, U4 are dependences showing the formation of signals on the first, second and third, respectively, and are quadruple, and at its output the signal changes from "O to" 1, which leads to

power amplifier 15 and then drive 11. which drives the nat fuel outputs of the counter 39; 45 coc 7- Fuel enters line 8.

U4o - dependence showing fore-On, for example, of the fifth impulse.

signaling at the output of the second counter to the input of the counter 39 on its third output 40; the signal "1, which transmits U2 .S dependence, indicating the second input of the trigger 24, is generated. The triggering of the signal at the output of the third trigger 24 switches and at its output the signal changes from "O to" 1, which leads to the inclusion of the spark-forming unit 18, at the output of which high-voltage pulses are generated, applied to the ignition generator 24;

20

U.

go

Dependence showing the flame control sensor 20,

where i0i is the return time of the control circuit

igniting the igniter 2 into the initial state electrode 19 of the igniter 2 for ignition and is determined by the switching time 25 of the Arc between the case and the electrode 19.

logic elements (for convenience of working with diagrams, when considering the operating modes of the device, the pulses from the generator 17 are numbered).

A device for automatic control. In addition, the amplifier 12 powers the drive 10 of the fuel valve 5, which supplies the fuel to the pilot light 2. The signal from the power amplifier 12 through the one-shot is simultaneously supplied

Lazy ignition of the burner works as follows: 30 43 enters the blocking input sensor-wise. 20 flame control. This signal for the initial state after supplying this duration, generated by the single-voltage supply to the rator control circuit 43, is necessary for the pre-fuel valves 4 and 5 are closed, and the electric motor 1 1 of the fuel valve, pump 7 is turned off, which eliminates the possibility of 35 fuel supply to the burner 1 and the igniter 2. In this case, the air in line 3 begins to flow simultaneously with the supply voltage to the burner control circuit.

The first launch of sensor 20 and the formation at its output of the signal "1.

In the process of ignition of the burner, the following situations may occur: the first ignition of the igniter 2 and then the ignition of burner 1 took place, the first ignition of the ignition. The closed position of the fuel valve 4 40 ka 2 did not take place, the first and second ignition correspond to the initial position of the sensor 41, at which its output a signal is generated corresponding to 1. At the outputs of the flip-flops 22 and 25, a signal is generated corresponding to "1, and at the outputs of the flip-flops 24 and 23" O.

The switching of the counters 39 and 40 occurs on the decline of the pulses coming from the generator 17.

At the command of the operator or control unit 2 did not take place.

Consider the case of successful ignition of the burner (Fig. 2).

In accordance with the described feed signal corresponding to 45 fuel and air to the igniter 2 and the presence

the arc between the housing and the electrode 19 causes the fuel to ignite in the pilot light 2. From the luminous flux created by the pilot light 2, a photocurrent in the sensor 20 is sufficient to hold

an automated complex for- ° ® of its executive relay. With this action

The globalizer 16 of the Start command sends a signal "1 to the first input of the And 31 element, and at its second input there is already a signal" 1 coming from the HE 36 element, since in the initial state at the output of the sensor 20, the signal corresponds to "O. At the output of the element And 31, a signal "1" is generated, which arrives at the first input of the trigger 24, which, by switching, enables

the signal from the one-shot 43 stops. Its duration, based on the operating experience of the furnace-drying unit for drying peat in a fluidized bed, is 55 equal to 2.5-3 s. By removing the signal from the blocking input of the sensor 20, it is switched on in the control mode. At the output of the element NO 38, the signal "1." In this case, the second counter output 39

the ignition electrode 19 of the igniter 2 for igniting a Arc between the housing and the electrode 19.

In addition, the amplifier 12 is turned on to the drive 10 of the fuel valve 5, which supplies the fuel to the igniter 2. At the same time, the signal from the amplifier 12 to the power through the one-shot

 This duration, generated by the one-shot 43, is required for pre-launching the sensor 20 and forming the signal "1." at its output.

In the process of ignition of the burner, the following situations may occur: the first ignition of the igniter 2 and then the ignition of the burner 1 took place, the first ignition of the igniter 2 did not take place, the first and second ignitions

the signal from the one-shot 43 stops. Its duration, based on the operating experience of the furnace-drying unit for drying peat in a fluidized bed, is chosen equal to 2.5-3 s. By removing the signal from the blocking input of the sensor 20, it is switched on in the control mode. At the output of the element NO 38, the signal "1." In this case, the second counter output 39

the decay from the fifth pulse through the element NOT 37 receives the signal “1 to the second input of the element 35.

The presence of the signal "1 on all inputs of the element And 35 causes its operation and the signal" 1 goes to the second input of the element OR-NO 28, which does not change its state, i.e., at its output is "O and simultaneously with this to trigger 22, which is switched, and at its output a "O" signal is generated. This leads to the formation at the output of the OR-NOT 28 signal “1, since both its inputs contain signals“ O, and preparation for switching on the element I 32 from the output of the flame control sensor 20. This eliminates the opening of the fuel valve 4 of the burner when an erroneous signal of the presence of flame is detected before the pilot light starts. Start-up is also eliminated due to the connection of one of the inputs of element And 31 with the output of sensor 20 through the element 36. This increases the safety of ignition of the burner in the event of a failure of sensor 20 of the flame control. Since the ignition of the fuel occurred in the pilot, then from the output of the sensor 20, the signal "1 is fed to the second input element I 32, the output of which is formed by the signal" 1, turning on the power amplifier 13, which in turn turns on the actuator 9 of the fuel valve 4, which will fuel supply to the burner, which ignites from the pilot flame. At the same time, turning on the fuel valve 4 also leads to turning off the sensor 41, at the output of which the signal “O” appears. This provides increased safety of the ignition of the burner, since the ignition start is prevented when the valve 4 is open. This is achieved by connecting the output of the sensor 41 to the second input of the AND 33 element. The signal "O is also generated at the first input of the OR-NOT 27 element, which associated with the output of sensor 41. But the signal at the output of the OR-NOT 27 element does not change, since at its second input there is a signal "1 from the flame control sensor 20. At the outputs of the sensors 20 and 41, the element OR-NOT 27 performs self-monitoring of the health of the element 32, power amplifier 13, actuator 9, valve 4 and sensor 41. If any of the indicated elements of the valve control circuit 4 fails, then signal from sensor 20 at the output of the element OR-NOT 27, a signal "1" is generated, which leads to switching on the element OR 29, power amplifier 14 and block 21. This ensures an increase in ignition safety, since with no signal "1" at the output of sensor 20 flame control and no signal 1 on the output of the sensor 41 is eliminated and the possibility of incorporation igniter formi0

5 0 5 0 5 0 5

A warning signal about L. vur is generated from the separate nodes of the valve circuit 4.

Upon the arrival of the ninth pulse from the generator 17 to the input of the counter 39, ia its fourth output, the signal "1. The choggy ry enters the third input of the 2A trigger. which is switched, and at its output of pho 1, the signal "O This leads: to the power supply amplifier 12, the courier. . turns off the actuator 10 of valve 5, and pas: nickname 2 and the spark forming unit 18, which leads to the disappearance of the flame of the pilot light 2. At the same time, the burner 1 remains on until the control circuit fails or fails its disconnection due to the separation of the p.p menm In this case, the da.plc 20 will work, which through the element 32 will turn off valve 9 when the water is 9, which prevents the fuel from flowing into the burner to} 1. Simultaneously with the signal of the element OR-HE 2b (in its all inputs there are signals “O) through the OR element 29 and the power amplifier N including are CHI-functional unit 21, the output of which is formed bA reliable ignition failure signal.

Upon the arrival of the tenth pulse from the generator 1 to the input of the counter 39 at its second output (by decreasing} this) a signal "L" is generated, which goes to the input of the counter 40, recording in it the ". Unit. at the same time, there is no signal at the connected output of counter 40 (sig;, it may only appear at its output after the arrival of the second pulse from the second output of counter 39).

After the pilot ignition of the eleventh pulse from the generator 17 to the input of the counter 39 at its first output -1, the signal "1 is generated. The signals "1 of the sensor 20 and the counter 39 arrive at the inputs of the element And 34. At its output, the signal" 1 is produced, which through the element OR 30 enters the input of the trigger 25, which switches and sets the counters 39, 40 to the zero state, and also duplicates the command to install trggera 24 to the zero state

The starting circuit of the igniter is in the initial state, while the burner 1 is in the operating mode.

In case of violations in the operation mode of the burner or its control circuit, which led to the triggering of the signal unit 21, the subsequent stage of operation of the burner 1 is possible after the formation of the command “Stop. At the command “Stop, the trigger 22 will be set to the initial state: switching of the trigger 23, which through the amplifier 15. turns off the drive 11 of the fuel pump 7, thereby excluding the supply of fuel to the line 8. through the element OR 30 posttmt the input signal

a trigger 25 which sets the control circuit of the igniter 2 to the initial state. In case of a planned stop of the burner 1, the control channel of the stop 42 of the command “Stop.

The second case of ignition of the igniter is considered when its first ignition did not take place (Fig. 3). In this case, the igniter start-up and the operation of the control circuit prior to the fuel supply and switching on the spark forming unit 18 are carried out as described (in the situation when the pilot light was lit at the first ignition).

If the ignition of the supplied fuel and air to the igniter 2, the ignition sensor 20 is switched off after the one-shot 43 is turned off. At the same time, the signal "1" is generated at the output of the element 38, the same signal is formed at the output of the element 37. At the supply of fuel and air to the igniter 2 and the presence of an arc between the housing and the electrode 19, the fuel in the ignition 2 ignites. produced by the ignition flame 2, in the sensor 20 flows a photocurrent sufficient to hold its executive relay. In this case, the effect of the signal from the single-vibrator 43 is terminated. Its duration, based on the operating experience of the furnace-drying unit for drying peat in the 15 fluidized bed, is chosen to be 1.5–3 s. By removing the signal from the blocking input of the sensor 20, it is switched on in the control mode. At the output of the element NO 38, the signal "1." At the same time, at the second output of the counter 39, by the decay of the sensor 20, the signal 20 is generated. The 20th pulse through the element NOT 37. When these signals arrive at the inputs of the element 35 at its output, the signal does not change, and therefore the actuator 9 of the valve 4 of the burner 1 will not turn on.

The signal "1." The presence of the signal "1 on all inputs of the element And 35 causes it to trigger and the signal" 1 is fed to the second input of the element OR NOT 26,

Upon the arrival of the ninth impulse from the generator-25 which does not change its state, i.e.

To torus 17 to the input of the counter 39, at its fourth output, a signal 1 is generated, which is fed to the third input of the trigger 24, which is switched, and the signal "O" is generated at its output. This leads to

its output is "O. Simultaneously, on the trigger 22, which is switched, and at its output, the signal "O" is generated. At the same time, the signal "1" is generated at the output of OR-NOT 28, since at both of its inputs the power amplifier 12 power turns off, which 30 ly correspond to "O. Further included

turns off the actuator 10 of the valve 5 of the igniter 2 and the spark forming unit 18.

Upon the arrival of the tenth pulse at the input of the counter 39 at its second output, after the decade of the tenth pulse, the signal "1 changes to" O and 40.

After the eleventh pulse arrives from the generator 17 to the input of the counter 39, the "1" signal is generated at its first output.

element 32 (at its second input there is a signal “1 from the flame control sensor 20), and then through the amplifier 13 - the actuator 9 of the fuel valve 4, which provides fuel to the burner 1, which

it is recorded in the count; 35 ignites from the pilot flame 2.

Upon the arrival of the nineteenth pulse from the generator 17 to the input of the counter 39, at its fourth output a signal "1 is generated, which is fed to the third input of the trigger 24,

The signal "1 from counter 39 and the signal" O from 4Q which switches and at its output the fordator 20 is fed to the inputs of the AND 34 element, but this will not change the signal at its output. The circuit continues to work.

After the arrival of the fifteenth pulse at the input of the counter 39 at its second output

The “O. This leads to the disconnection of the power amplifier 12, which turns off the actuator 10 of the valve 5 of the pilot 2 and the spark generating unit 18, which leads to the disappearance of the flame of the pilot 2.

The signal "1 is generated, which arrives 45. At the same time, the burner 1 remains on, to the second input of the trigger 24. Trigger 24

switches and at its output the signal changes from "O to" 1, which leads to the inclusion of the spark forming unit 18, the output of which forms high-voltage pulses applied to the ignition electrode 19 of the pilot 2 to ignite the arc between the housing and the electrode 19. In addition, power amplifier 12, pr.ivoda 10 fuel valve 5, which provides fuel to the

Upon the arrival of a pulse from the generator 17 to the input of the counter 39 at its second output, by the decay of the twentieth pulse, the signal "O changes to" 1, and the output of the counter 40 50 produces the signal "1, which through the OR 30 element enters the second input of the trigger 25. The trigger 25 switches and sets the counters 39, 40, as well as the trigger 24 to the zero state. The startup circuit is in the initial state.

OO

Igniter 2. Simultaneously, the signal with At the same time, the burner 1 remains in the working

the power amplifier 12 through the one-shot 43 is supplied to the blocking input of the flame control sensor 20. This signal is reserved.

Consider the case where the first and second ignition of the igniter 2 did not take place.

This duration, generated by the one-shot 43, is required for pre-launching the sensor 20 and forming the signal "1." at its output.

The supply of fuel and air to the igniter 2 and the presence of an arc between the housing and the electrode 19 cause the fuel to ignite in the igniter 2. From the luminous flux created by the ignition flame 2, in the sensor 20 a photocurrent flows enough to hold its executive relay. In this case, the effect of the signal from the single-vibrator 43 is terminated. Its duration, based on the operating experience of the furnace-drying unit for drying peat in a fluidized bed, is chosen to be 1.5–3 s. By removing the signal from the blocking input of the sensor 20, it is switched on in the control mode. At the output of the element NO 38, the signal "1." At the same time, at the second output of the counter 39, by decreasing the fifth pulse through the NOT 37 element of the expressed pulse through the NO 37 element, the signal "1. The presence of the signal "1 on all inputs of the element And 35 causes it to trigger and the signal" 1 is fed to the second input of the element OR NOT 26,

 which does not change its state, i.e.

 which does not change its state, i.e.

its output is "O. Simultaneously, on the trigger 22, which is switched, and at its output, the signal "O" is generated. At the same time, the signal "1" is generated at the output of OR-NOT 28, since at both its inputs a signal is switched and at its output a signal "O" is generated. This leads to the disconnection of the power amplifier 12, which turns off the actuator 10 of the valve 5 of the pilot 2 and the spark generating unit 18, which leads to the disappearance of the flame of the pilot 2.

Upon the arrival of a pulse from the generator 17 to the input of the counter 39 at its second output, after the decay of the twentieth pulse, the signal "O changes to" 1, and the output of the counter 40 generates the signal "1, which through the OR 30 element enters the second input of the trigger 25. Trigger 25 switches and sets the counters 39, 40, as well as the trigger 24 to the zero state. The startup circuit is in the initial state.

At the same time, the burner 1 remains in operation.

mode.

Consider the case where the first and second ignition of the igniter 2 did not take place.

Claims (1)

(Fig. 4). In this case, the operation of the circuit before the fifth pulse from the generator 17 arrives at the input of the counter 39 and then after forming at its third output the signal "1 before turning on the spark forming unit 18 and supplying fuel and air to the pilot light 2, as well as turning on the sensor 20 at the blocking input the one-shot 43 is carried out similarly to the operation of the device described (in a situation where the first ignition of the igniter has failed). If, during repetition, the supply of fuel and air to the igniter 2, its ignition did not take place, then after the one-shot 43 is turned off, the flame control sensor 20 is also disconnected. At the same time, the signal "1" is generated at the output of the element 38, the same signal is already present at the output of the element 37. At the output of the sensor 20, the signal "O" is formed. When these signals arrive at the inputs of the And 35 element at its output, the signal does not change, and the formula 10 An automatic ignition control device for a burner equipped with a fuel pump with an electric motor, containing a single vibrator, a start command connected to the first input of the first element I, the second input of which is connected through the element NOT to the flame sensor, the fuel valve actuator is connected to the first power amplifier, the inlet of which is connected to a spark forming unit connected to the high voltage electrode of the igniter, the burner fuel valve actuator connected to the second mosh amplifier, connected to nym a second AND gate having a first input coupled to an output of first OR-NO element, and the second - a flame detector and the first input of the second OR-NO element, a second input coupled to 25 In this case, the activation of the actuator 9 of the valve 4 with the burner 20 does not occur. Upon the arrival of the nineteenth pulse from the generator 17 to the input of the counter 39 at its fourth output a signal "1" is generated, which is fed to the third input of the trigger 24, which switches and its signal forms the signal "O" This leads to the disconnection of the power amplifier 12, which turns off the actuator 10 of the valve 5 of the igniter 2 and the spark forming unit 18. As the twentieth pulse decays at the second output of the counter 39, the signal "1 changes to" O. This leads to the formation of an "1" pulse at the output of the counter 40, which through the OR element 30 arrives at the second input of the trigger 25. The trigger 25 switches and sets the counters 39 and 40, as well as the trigger 24, to the zero state. The startup circuit is reset. In this case, the control circuit can be completely turned off by the signal of the shaper 14 of the command Stop, which, coming to the first input of the trigger 23, switches it and turns off the amplifier 15 and the drive 11 of the fuel pump 7. The fuel supply to the line 8 is stopped, and when the power is removed The air supply is disconnected from the control circuit of the device. Note that from the stop command 42, it is possible to stop the operation of both the burner 1, which has already been shown, and the trigger (i.e., return it to the initial state) of the pilot 2 through the input of the element OR 30. 35 the output, to the first input of the OR element, the second input of which is connected to the output of the third element OR; NOT, the first input of which is connected to the drive of the burner fuel valve, and the second to the first input of the trigger, to the second input of which the stop command is connected and the third with the trigger output and the first input of the first element OR NOT, the output of the third amplifier connected to the signal block of the third amplifier, whose input is connected to the output of the element OR, which is connected to the output of the OR element, is connected to the second input; reliability, it contains the third power amplifier, the third, fourth and fifth elements AND, the second and third elements are NOT, the second, third, fourth triggers, the second element OR, the generator and two counters, the third power amplifier is connected to the fuel pump electric motor and the second trigger, the first input of which is connected to the stop command shaper and the first input of the second OR element, and the second - to the output of the third element I. Its first input is connected to the burner fuel valve position sensor, and the second to the first output of the first counter and the first input of the fourth element AND, the second input of which is connected to the flame sensor, and the output to the second input of the second OR element, to the third input of which the output of the second counter is connected, the first input of which is connected to the second output of the first counter and input the second element is NOT. and the second - with the first input of the first counter, the first output of the third trigger and the first output of the fourth trigger, the second output of which is connected to the first input of the generator, the first input - to the output of the second element OR, and the second input - to the output of the first element And and the second input of the generator 40 45 50 In the event of device malfunctions associated with turning on the signal unit 21, the subsequent stage of its operation will be possible only after the violations are eliminated and the Stop command that the trigger 22 turns off by forming the burner is generated by the pager, thereby allowing the burner to start. Yu, 10 Formula of Invention ka, An automatic ignition control device for a burner equipped with a fuel pump with an electric motor, containing a single vibrator, a start command connected to the first input of the first element I, the second input of which is connected through the element NOT to the flame sensor, the fuel valve actuator is connected to the first power amplifier, the inlet of which is connected to a spark forming unit connected to the high voltage electrode of the igniter, the burner fuel valve actuator connected to the second mosh amplifier, connected to nym a second AND gate having a first input coupled to an output of first OR-NO element, and the second - a flame detector and the first input of the second OR-NO element, a second input coupled to the fuel valve position sensor is five 0 by the fuel valve position sensor five five the output, to the first input of the OR element, the second input of which is connected to the output of the third element OR; NOT, the first input of which is connected to the drive of the burner fuel valve, and the second to the first input of the trigger, to the second input of which the stop command is connected and the third with the trigger output and the first input of the first element OR NOT, the output of the third amplifier connected to the signal block of the third amplifier, the input of which is connected to the output of the OR element, which is connected to the output of the OR element, is connected to the second input; reliability, it contains the third power amplifier, the third, fourth and fifth elements AND, the second and third elements are NOT, the second, third, fourth triggers, the second OR element, the generator and two meters, the third power amplifier is connected to the fuel pump electric motor and the second trigger, the first input of which is connected to the stop command shaper and the first input of the second OR element, and the second - to the output of the third element I. Its first input is connected to the burner fuel valve position sensor, and the second to the first the first counter and the first input of the fourth element AND, the second input of which is connected to the flame sensor, and the output to the second input of the second OR element, to the third input of which the output of the second counter is connected, the first input of which is connected to the second output of the first counter and input the second element is NOT. and the second - with the first input of the first counter, the first output of the third trigger and the first output of the fourth trigger, the second output of which is connected to the first input of the generator, the first input - to the output of the second OR element, and the second input - to the output of the first And element and the second input of the generator0 five 0 the mountain, the output of which is connected to the second input of the first counter, the third and fourth outputs of which are connected to the second and third inputs of the third trigger, the output of which is connected to the input of the first power amplifier, to the output of which a one-shot connected to the sensor is connected the flame and the input of the third element is NOT, the output of which is connected to the first input of the fifth element AND, the second input of which is connected to the output of the second element NOT, the third one is connected to the flame sensor and the output is connected to the second input of the third element OR NOT Lzd Ur U, 1 2 3 tf 5 6 7 8 3 101112 13111516171819 20 2122 ПППППППППППППППП ПП t P L Uw n L torn FIG. 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