KR101607119B1 - Misfire detection method during the boiler - Google Patents

Abstract

The present invention relates to a misfire detection method of a boiler, which comprises the following steps of: clearing a misfire cumulative value; checking maximum quantity of heat (Qmax) and ignition quantity of heat (Qig) with respect to control quantity of heat of the boiler; igniting a burner; determining whether a blower fan is normally operated, and normal ignition can be performed in order; proportionally controlling quantity of heat of the burner when the blower fan is normally operated, and the normal ignition can be performed; receiving the current control quantity of heat (Q) to be memorized; returning the quantity of heat of the burner to proportional control when misfire is not performed; increasing one time of a previous misfire sum when the misfire is performed; determining whether the misfire sum is greater than the predetermined number of times; and safely stopping the burner when the misfire sum is greater than the predetermined number of times. Therefore, when gas pressure is inadequate, a range of perfect combustion can be maximally secured by controlling quantity of heat.

Description

[0002] Misfire detection method during the boiler [0003]

More particularly, the present invention relates to a method for detecting a misfire on the way of a boiler, more specifically, when the boiler is misfired due to some cause during the combustion of the boiler, the maximum calorie is reset by reducing the calorific value based on the calorific value The system is designed to re-ignite, but by restricting the amount of heat that is calorific value lower than the calorific value when it is misfired on the way to the maximum consumption amount, by limiting the amount of air more than the amount of gas, The present invention relates to a misfire detecting method for detecting a misfire of a boiler that is invented to extend the boiler.

Generally, a boiler uses hot oil, coal, and gas as fuels and burns it, or uses heat and heat generated by supplying electricity to a heater to supply water to various heating facilities In the case of a domestic boiler, hot water is supplied to the piping installed on the floor of the room or the like, and the hot water is supplied to the hot water through a water pipe.

When the heating mode is operated in the heating / hot water boiler, the circulation pump is operated to transfer the heating water, and the heating water is heated in the main heat exchanger to be supplied to the heating load (i.e., heating pipe) Heating is carried out.

In addition, the supply of the hot water blocks the path from the three-way valve to the heating load side and opens the path to the hot water heat exchanger side to transfer the heated water heated in the main heat exchanger to the hot water heat exchanger side, Heat exchange can be performed between the heating water and the hot water to be supplied to the user.

On the other hand, the cause of the misfire is the interruption of the fuel supply, the failure of the fuel supply device, the clogging of the exhaust gas of the heat exchanger (closure), clogging of the flue (closure) of the heat exchanger, , Lack of air supply due to backward wind, failure or failure of supply fan.

The combustion in the boiler burner is interrupted and the misfire occurs.

The definition of misfiring is defined as follows. That is, the combustion in the burner is normally carried out according to the operating specifications of the system control. However, even if the combustion command is not caused by the system control operation specification but the above reasons, Digestion is done.

However, the occurrence of a misfire during the combustion of a boiler may be caused by the above-mentioned cause or by a temporary time effect. For example, during a normal combustion, a strong backwash may pressurize the exhaust port of the boiler The fuel supply control valve may be momentarily blocked due to temporary interruption of the air supply for combustion or instantaneous power failure or the like.

In such a case, the normal combustion can be continuously performed by the re-ignition operation. However, in the conventional boiler, by using the wind pressure or the differential pressure switch or the like to immediately stop the operation or simply re- It was impossible to judge the non-operating stop condition.

That is, when the system is immediately stopped, there is a problem that the system can be reused. If the system is re-initialized after the misfire, the system ignores the number of misfires and the situation is ignored. There is a problem that a large amount of CO gas is discharged and the use state of the apparatus is further deteriorated.

The problems of the re-ignition system after a misfire will be described in more detail. For example, when a large amount of soot is generated in the combustion heat exchanger, and the heat exchanger fin (or the bufle) In this case, if the re-ignition is performed, the burner is once recirculated. After that, since the heat exchanger is blocked, it is re-ignited and repeatedly repeatedly performing the recirculation, so that the state of the apparatus is greatly deteriorated or a large amount of CO gas is discharged It may be discharged to the room through a gap in the exhaust top of the exhaust top portion or a lower end portion of the heat exchanger to cause a dangerous situation.

On the other hand, in most boilers in the past, when re-burning occurs during misfiring during combustion, the re-burning is performed. However, when the amount of gas is lower than the proper amount of gas for controlling the amount of heat,

In other words, the cause of the misfire in the boiler may be a decrease or interruption of the supply gas, a failure of the fuel supply device, a clogging of the exhaust gas of the heat exchanger, a failure or failure of the blower fan, , And the incomplete combustion occurs because the air quantity and the heat quantity supplied do not match before the misfire occurs on the way.

However, in the conventional boiler, when the misfire occurs on the way, the number of misfires is increased and the re-ignition is repeated.

However, until the cause of the misfire is canceled on the way, the misfire is repeatedly generated, so that the operation of the boiler is stopped. In addition, incomplete combustion occurs until the stoppage is made. There is a problem that it is inconvenient for consumers because heating stoppage and use of hot water are impossible.

Korean Registered Patent No. 10-0427390 (April 02, 2004) Korean Patent Registration No. 10-0303372 (Jul. 02, 2001)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to restrain a calorific value which is lower than a calorific value, It is possible to maximize the range in which the total amount of combustion can be controlled by regulating the amount of control heat when the gas pressure is insufficient and to limit the amount of heat to prevent misfire on the way (that is, to prevent the stoppage due to an error) And it is an object of the present invention to provide a misfire detection method of a boiler which can completely prevent incomplete combustion by appropriately controlling the amount of air and the amount of gas by limiting the amount of heat.

In order to achieve the above object, the present invention provides a method for controlling a temperature in a boiler, comprising the steps of: clearing an accumulated misfire value stored in a storage device when an operation switch provided in a temperature control device in a boiler is turned on; Confirming a maximum calorific value (Qmax) and an ignition calorie (Qig) with respect to the control calorific value of the corresponding boiler stored in the storage device; Operating the gas supply drive device and igniting the burner through the ignition device; Sequentially determining whether the blowing fan operates normally and whether the normal ignition has been performed; Controlling the heat quantity of the burner proportionally if the blowing fan operates normally and the ignition is normal; Receiving and storing a current control calorie (Q); Determining whether the misfire is performed on the way through the flame detecting device, and returning the calorific value of the burner to the proportional control when the misfire is not performed on the way; If the misfire is made on the way, incrementing the misfire accumulated in the previous step stored in the memory device by "1" times; Determining whether the accumulated misfire count is equal to or greater than the predetermined count (A); And stopping the burner safely if the misfire accumulation amount is equal to or greater than the predetermined number (A).

The method may further include the step of displaying a false misstep on the display unit of the temperature controller after the burner is safely stopped.

Further, the present invention is characterized by further comprising the step of immediately stopping the burner when the blowing fan does not operate normally or when the ignition is not performed normally.

Determining whether the ignition calorie value Qig is larger than the maximum calorific value Qmax of the control heat quantity if the misfire accumulated amount is less than the predetermined number of times A; If the ignition heat quantity Qig is not larger than the maximum heat quantity Qmax of the control heat quantity, the result obtained by subtracting the heat quantity Qdown determined from the current control heat quantity Q is reset to the maximum heat quantity Qmax of the boiler, And returning to the step of confirming the maximum amount of heat (Qmax) and the amount of ignition (Qig) of the ignition.

In this case, the number of misfire accumulation times is set to 10 to 20, which is a range in which explosion ignition does not occur depending on the exhaust system and the exhaust length.

Also, the predetermined amount of heat Qdown subtracted from the current control heat quantity Q is set to a heat amount of 30 to 50 psi / min in order to reset the maximum heat quantity Qmax of the boiler.

If the maximum number of calories Qmax is less than the ignition calorie value Qig due to the number of times of misfire in the middle is less than the predetermined number A and the resetting of the maximum calorie amount Qmax is repeated, Returning to the step of confirming the maximum heat quantity Qmax and the ignition heat quantity Qig for the control heat quantity of the boiler immediately without resetting the heat quantity Qmax.

On the other hand, the resetting of the maximum amount of heat (Qmax) is automatically performed when it is judged by the control unit and the combustion prohibition condition is reached, and the maximum amount of heat (Qmax) is changed to the initial value.

As described above, according to the misfire detecting method on the way of the boiler of the present invention, it is possible to restrict the amount of heat, which is lower by a certain amount of heat than the amount of heat, It is possible to maximize the range in which the total combustion can be achieved through the control of the calorific value when the gas pressure is insufficient and to prevent the misfire on the way (that is, to prevent the stop due to the error) And the amount of air and the amount of gas can be appropriately controlled through the restriction of the amount of heat. Therefore, incomplete combustion can be completely prevented, and safety of the consumer can be secured. In addition, reliability of the boiler itself It is a very useful invention.

1 is a schematic block diagram of a boiler to which the method of the present invention is applied;
2 is a flow chart for explaining the method of the present invention.
FIG. 3 is a graph showing the relationship between the operating state of the blowing fan in the boiler and the change in the amount of heat applied to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a boiler to which the method of the present invention is applied. FIG. 2 is a flow chart for explaining the method of the present invention. FIG. 3 is a view showing the operation state of a blowing fan in a boiler, And a graph showing a relationship with the change in calories.

According to the present invention,

A step S2 of clearing the accumulated misfire value stored in the storage device 42 when the operation switch provided on the temperature control device 7 is turned on in the control unit 4 in the boiler;

(S3) of confirming the maximum heat quantity (Qmax) and the ignition heat quantity (Qig) with respect to the control heat quantity of the boiler stored in the storage device (42);

(S4) of operating the gas supply drive device (6) and igniting the burner through the ignition device (2);

(S5) (S6) sequentially judging whether the blowing fan (51) operates normally and whether normal ignition has been performed;

(S8) of proportionally controlling the amount of heat of the burner if the blowing fan (51) operates normally and the ignition is normal;

 A step (S9) of inputting and storing the current control heat quantity (Q);

A step (S10) of judging whether a misfire occurs midway through the flame detecting device (3), and a step of returning to a step (S8) of proportionally controlling the amount of heat of the burner if the misfire is not performed (No in step S10);

(S11) of increasing the misfire accumulated in the previous step stored in the storage device by "1" if the misfire is made on the way (Yes in S10);

A step (S12) of judging whether or not the accumulated misfire count is equal to or greater than the predetermined number (A);

(S13) of stopping the burner safely when the accumulated misfire count is equal to or greater than the predetermined number (A).

The method further includes a step (S14) of displaying a false misstep on the display unit 71 of the temperature regulating device 7 after the burner is safely stopped (S13).

If the blowing fan 51 does not operate normally (No in S5) and the ignition is not normal (No in S6), it further includes a step S7 for immediately stopping the burner safely .

If the accumulated misfire is less than the predetermined number A (S12: No), it is determined whether the ignition quantity Qig is larger than the maximum quantity Qmax of the control quantity (S15);

If the ignition heat quantity Qig is not greater than the maximum heat quantity Qmax of the control heat quantity, the result obtained by subtracting the heat quantity Qdown determined from the current control heat quantity Q is reset to the maximum heat quantity Qmax of the boiler S16, Returning to the step S3 of confirming the maximum calorific value Qmax and the ignition calories Qig with respect to the control calorific value of the boiler as in the case where the calorific value Qig is larger than the maximum calorific value Qmax of the calorific value .

In this case, the number of misfire accumulation times is set to 10 to 20, which is a range in which explosion ignition does not occur depending on the exhaust system and the exhaust length.

Also, the predetermined amount of heat Qdown subtracted from the current control heat quantity Q is set to a heat amount of 30 to 50 psi / min in order to reset the maximum heat quantity Qmax of the boiler.

If the maximum number of calories Qmax is less than the ignition calorie value Qig (Yes in S15) because the number of times of misfire is less than the predetermined number of times A, or the resetting of the maximum calorie amount Qmax is repeated, (S17) of returning to the step S3 of confirming the maximum heat quantity Qmax and the ignition heat quantity Qig with respect to the control heat quantity of the boiler immediately without resetting the maximum heat quantity Qmax .

On the other hand, during the execution of the method of the present invention, the resetting of the maximum calorie amount Qmax is automatically performed when the result of the judgment by the control unit 4 becomes the prohibition of combustion, and the maximum calorie amount Qmax is changed to the initial value .

The operation and effect of the method of the present invention having the above steps will be described as follows.

First, as shown in FIG. 1, a boiler to which the method of the present invention is applied includes a hot water temperature detecting device 1 for detecting a hot water temperature in a heat exchanger, an ignition device 2, a flame detecting device 3, A control unit 4 including a storage device 42 and a blowing fan driving device 5 for controlling the driving of the blowing fan 51 and a gas supply drive device 6 for controlling the movement of the gas valve 61 And a temperature control device 7 including various keys and a display portion 71. [

In the boiler control unit 4 constructed as described above, the state of the operation switch provided in the temperature control device 7 is continuously checked as shown in FIG. 2, And clears the stored accumulated value for misfiring to "0 " (S2).

Then, the maximum heat quantity Qmax and the ignition heat quantity Qig for the control heat quantity of the boiler stored in the storage device 42 are checked (S3).

The maximum calorific value Qmax may be a maximum calorific value that can be controlled by the boiler or a result obtained by subtracting a calorie quantity Qdown determined from a current calorific value Q as described later, Is the amount of heat required to ignite the boiler in question.

The storage device 42 in the control unit 4 stores the minimum heat amount Qmin and the maximum amount of air (including the maximum heat quantity Qmax of the control heat quantity capable of proportional control according to the boiler model) (The amount of air when the blowing fan has the maximum number of revolutions), the amount of air at the time of ignition (the amount of air corresponding to the number of revolutions of the blowing fan necessary for ignition), and the ignition heat quantity Qig are stored. The control unit 4 ignites and performs proportional control in the various control heat quantity ranges stored in the storage device 42 as described above.

The control unit 4 which confirms the maximum calorific value Qmax and the ignition calorie Qig with respect to the control calorific value of the boiler as described above is then supplied to the gas valve 61 At the same time, the ignition device 2 is operated to ignite the burner (S4).

Thereafter, the control unit 4 determines whether the blowing fan 51 is operating normally (S5) through a method of checking the state of the blowing fan 51 and the state of the burner through the flame detecting device 3, (S6) whether the normal ignition has been performed or not.

When the blowing fan 51 is not operated normally (No at S5) or when the ignition is not normal (No at S6) as a result of checking the blowing fan 51 and the ignition state, the blowing fan 51 ) And the gas valve 61, and immediately stops the burner (S7).

However, if the blowing fan 51 is operating normally and the ignition is normal, the amount of heat of the burner is proportionally controlled (S8). If the blowing fan 51 is operated normally, the current control quantity Q is continuously input 42) (S9).

In this way, while the proportional control is performed and the current control heat quantity Q is received and stored continuously in the storage device 42, the control unit 4 continuously detects whether the misfire occurs midway through the flame detection device 3 (S10). If the misfire is not made (No in S10), the subsequent steps of returning to the step S8 for proportionally controlling the amount of heat of the burner are repeated.

If the result of the determination by the control unit 4 indicates that the misfire has been performed on the way (Yes in S10), the misfire accumulated in the memory 42 previously stored in the memory 42 is incremented by "1" (S11). Then, it is determined whether or not the accumulated misfire accumulation amount "1" times is greater than or equal to the predetermined number (A) (S12).

At this time, the accumulated number of times of misfire is determined within a range in which explosion ignition does not occur according to the exhaust method and the exhaust length, and is determined within 10 to 20 times in the present invention.

As a result of judging in step S12 whether or not the accumulated misfire count is equal to or greater than the predetermined count A as described above in the control unit 4 as described above, (S13), it is recognized that a misfire has occurred midway due to a decrease or interruption of the supply gas, a failure of the fuel supply device, a clogging of the exhaust port of the heat exchanger, a failure or failure of the blowing fan, and the like.

Further, in the present invention, when the burner is safely stopped (S13) for the above-described reasons, the control unit 4 causes the display unit 71 of the temperature control device 7 to display a misfire error on the way (S14) The consumer can accurately recognize the misfire state on the way and can promptly perform the service request.

On the other hand, if it is determined in step S12 that the accumulated misfire count is less than the predetermined number A (No in S12), the ignition calorie quantity Qig stored in the storage device 42 becomes the maximum calorie quantity Qmax) (S15).

If it is determined that the ignition heat quantity Qig is not greater than the maximum heat quantity Qmax of the control heat quantity, the result obtained by subtracting the heat quantity Qdown determined by the current control heat quantity Q is reset to the maximum heat quantity Qmax of the boiler (S16), and the process returns to step S3 where the maximum heat quantity Qmax and the ignition heat quantity Qig with respect to the control heat quantity of the boiler are checked, and the subsequent steps are repeated.

At this time, in order to reset the maximum heat quantity Qmax of the boiler, the predetermined heat quantity Qdown subtracted from the current control heat quantity Q is variable according to the maximum heat quantity of each boiler. In the present invention, Respectively.

If the number of misfires is less than the predetermined number A during the result of the determination by the controller 4 but the previously calibrated maximum calorie quantity Qmax is less than the ignition calorie quantity Qig due to the repetition of resetting for the maximum calorie quantity Qmax, (Yes in S15), it becomes a heat quantity which can not be ignited as shown in the graph of the relationship between the operating state of the blowing fan and the change in the heat quantity shown in Fig.

Therefore, in the present invention, if the maximum heat quantity Qmax is less than the ignition heat quantity Qig (Yes in S15), the maximum heat quantity Qmax for the control heat quantity of the boiler is directly set without resetting the maximum heat quantity Qmax (S17) (Step S3) of confirming the ignition calorie (Qig) and re-ignition (that is, re-ignition is performed without resetting the maximum amount of heat (Qmax)).

On the other hand, when the control unit 4 determines that the combustion condition (for example, the heating temperature and the hot water temperature reach the set temperature of the user and the extinguishing condition is reached) (Qmax) is automatically released (ie, the heat limit is released), and the maximum heat quantity (Qmax) is changed to the initial maximum heat quantity (Qmax) of the boiler.

As described above, in the present invention, by restricting the amount of heat, which is lower than a calorific value lower than a calorific value lower than a calorific value, It is possible to maximize the range in which the combustion can be completely performed.

In addition, it is possible to prevent the misfire on the way by limiting the quantity of heat, thereby extending the operating life of the boiler and completely preventing the incomplete combustion. Therefore, not only the safety of the consumer can be secured but also the reliability Can be greatly improved.

Although the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Which will be apparent to those skilled in the art.

1: tapping temperature detection device
2: Ignition device
3: Flame detector
4:
41: computing device 42: storage device
5: blower fan drive device 51: blower fan
6: gas supply drive device 61: gas valve
7: Temperature control device 71: Display

Claims (8)

Clearing an accumulated misfire value stored in the storage device when the operation switch provided in the temperature control device is "on" in the control unit in the boiler;
Confirming a maximum calorific value (Qmax) and an ignition calorie (Qig) with respect to the control calorific value of the corresponding boiler stored in the storage device;
Operating the gas supply drive device and igniting the burner through the ignition device; Sequentially determining whether the blowing fan operates normally and whether the normal ignition has been performed;
Controlling the heat quantity of the burner proportionally if the blowing fan operates normally and the ignition is normal;
Receiving and storing a current control calorie (Q);
Determining whether the misfire is performed on the way through the flame detecting device, and returning the calorific value of the burner to the proportional control if the misfire is not performed on the way;
If the misfire is made on the way, incrementing the misfire accumulated in the previous step stored in the memory device by "1"times;
Determining whether the accumulated misfire count is equal to or greater than the predetermined count (A);
Stopping the burner safely if the misfire accumulation amount is equal to or greater than the predetermined number of times (A);
Determining whether the ignition calorie value Qig is larger than the maximum calorific value Qmax of the control heat quantity if the misfire accumulation amount is less than the predetermined number of times A;
If the ignition heat quantity Qig is not larger than the maximum heat quantity Qmax of the control heat quantity, the result obtained by subtracting the heat quantity Qdown determined from the current control heat quantity Q is reset to the maximum heat quantity Qmax of the boiler, And returning to the step of checking the maximum heat quantity (Qmax) and the ignition heat quantity (Qig) for the boiler.
The method according to claim 1,
Further comprising the step of displaying a misfire on the way to the display unit of the temperature controller after the burner is safely stopped.
The method according to claim 1,
Further comprising the step of safely stopping the burner when the blowing fan does not operate normally or when ignition is not performed normally.
delete The method according to claim 1,
If the reset maximum heat quantity (Qmax) is less than the ignition heat quantity (Qig) due to the repetition of the reset for the maximum heat quantity (Qmax), the maximum heat quantity (Qmax) for the control heat quantity of the boiler And returning to the step of confirming the ignition calorie (Qig).
The method according to claim 1,
Wherein the misfire count is set to 10 to 20 during the middle of the boiler.
The method according to claim 1,
(Qdown) subtracted from the current control heat quantity (Q) to set the maximum heat quantity (Qmax) of the boiler is set to a heat quantity of 30 to 50 kPa / min.
The method according to claim 1,
Wherein the control unit automatically releases the resetting of the maximum amount of heat (Qmax) when the burner is in a prohibition condition of burning of the boiler, and changes the maximum heat quantity (Qmax) to the initial value.

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