KR101938569B1 - Exhaust-pipe deviation detection and combustion control method of boiler - Google Patents

Abstract

The present invention relates to a method of detecting the deviation of an exhaust gas from a boiler and controlling the combustion of the boiler. More particularly, the present invention relates to a method of controlling a boiler, Performing a calorie control; Detecting an air supply temperature (Tin) and storing the air supply temperature (Tin) at a reference air supply temperature (T1), and starting counting a predetermined air supply temperature stabilization time (A); Continuously determining whether a predetermined supply air temperature stabilization time (A) has elapsed; If the predetermined supply air temperature stabilization time A has elapsed, detecting the supply air temperature Tin and storing it as a comparison supply air temperature T2; Determining whether a temperature difference obtained by subtracting the reference supply air temperature (T1) from the reference supply air temperature (T2) is equal to or higher than a predetermined comparison target temperature (T3); If the temperature difference obtained by subtracting the reference supply air temperature (T2) from the reference supply air temperature (T1) is not equal to or higher than the predetermined comparison target temperature (T3), the air supply temperature stabilization time (A) coefficient value is reset, Returning to the step of starting the counting of the predetermined supply air temperature stabilization time (A) at the same time as storing the air supply temperature stabilization time (T1) and repeating the subsequent steps; If the temperature difference obtained by subtracting the reference supply air temperature (T2) from the reference supply air temperature (T1) is equal to or higher than the comparison target temperature (T3), the control unit recognizes that the exhaust air temperature is deviated first and forcibly extinguishes the burner .
Therefore, it is possible to secure not only the safety due to the exhaust gas leakage which may be caused due to the deviation of the exhaust year, but also the quality and the reliability of the product itself to be greatly improved.

Description

Exhaust-pipe deviation detection and combustion control method of boiler

More particularly, the present invention relates to a method for controlling the supply air temperature detected by an air supply temperature detection sensor installed in an air supply unit of a heat exchanger of a boiler, The control unit detects the departure of the exhaust year by using the ON / OFF state signal of the differential pressure switch and prevents the production cost of the product from rising. If it is judged that the exhaust year is deviated, the boiler in the burning state is forcibly stopped ) Of the invented boiler so as to prevent the danger due to the exhaust gas leakage (that is, to secure the safety due to the exhaust gas leakage) through the method of indicating that the exhaust gas is out of course, And a control method.

In general, a boiler uses oil, coal, and gas as fuel, burns it through a burner, or supplies heat to a heater to heat the water by using combustion heat and heat, 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 is used for supplying hot water through a water pipe or the like.

The boiler is classified according to the type of the air supply and exhaust. In the forced air supply and exhaust, the exhaust gas generated when the burner is burned is forcibly discharged through the exhaust air. In the course of discharging the exhaust gas, And the air supply is heated by the heat generated in the exhaust gas in the course of the external air flowing into the heat exchanger through the intake pipe provided outside the flue.

In this way, when the temperature of the supply air supplied to the boiler is exchanged with the heat that is transferred through the exhaust year, the heat is exchanged with the exhaust air when the exhaust air temperature is normally set. However, when the exhaust gas temperature deviates from the boiler inlet, the heat exchanger does not normally perform heat exchange, and there is a difference between the case where the flue is in a steady state and the supply air temperature due to the incoming air supply. At this time, since the temperature of the exhaust gas is higher than the temperature of the supply air, the temperature of the supply air is lower than when the temperature of the supply air is normal.

In addition, if the exhaust flue of the boiler is broken or detached from the heat exchanger due to impact or the like, the exhaust load is reduced and the temperature of the air supply is lowered. In addition, safety problems such as personal injury caused by exhaust gas leakage .

Therefore, in a boiler using gas as a fuel, safety can be ensured only by accurately detecting the deviation of the exhaust gas in any form and performing combustion control. In most conventional boilers, as a method of detecting the deviation of the exhaust gas, The exhaust gas detection sensor is installed inside or outside of the boiler to directly detect the exhaust gas leakage, so that the production cost of the product is increased, and the state of the exhaust gas detection sensor, which is expensive and has a high failure rate, There is a problem that must be managed.

Korean Utility Model Registration Bulletin 20-0187933 (April 22, 2000) Korean Patent Publication No. 2000-0073761 (December 05, 2000) Korea Registered Utility Model Office 0138932 (December 09, 1998)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the related art, and it is an object of the present invention to provide an air supply system, an air conditioner, And if the difference is equal to or higher than the predetermined comparison target temperature, the difference is recognized as a departure from the exhaust year, and the burner is stopped (i.e., extinguished) so that the risk of exhaust gas leakage is not detected The present invention provides a method for detecting the deviation of an exhaust gas from a boiler and a method for controlling the combustion of the boiler, which can improve the quality and reliability of the product itself, as well as ensure safety due to exhaust gas leakage.

It is another object of the present invention to provide a method for controlling the supply of unburnt gas and residual exhaust gas in a combustion chamber after stopping (that is, extinguishing) the burning of the burner, A post purge for operating the blowing fan at a predetermined number of revolutions is performed for a predetermined period of time to discharge the air to the outside, and it is continuously judged whether the differential pressure switch installed in the air discharge portion of the blowing fan is in the " If the differential pressure switch is in the "ON" state before the post purge time, the exhaust emission is completely recognized as being in the deviated state and the indicator indicating that the exhaust emission is in an error state is marked on the display unit. The boiler repairman, including the user, will be able to accurately identify the departure date and take immediate action It also provides a flue exhaust and combustion control of the boiler escape detection methods that can dramatically improve the reliability of the products and services, such as the product itself.

According to an aspect of the present invention, there is provided a method for controlling a boiler, the method comprising: performing a heating or hot water combustion in a control unit when the power of the boiler is turned on; Performing a calorie control by comparing the gas and air supply amount supplied to the burner with the heating water or the room temperature and the hot water temperature with respect to the set temperature of the user; Detecting an air supply temperature (Tin) through an air supply temperature detection sensor installed in the air supply unit of the heat exchanger, storing the air supply temperature (Tin) at a reference air supply temperature (T1), and starting counting a predetermined air supply temperature stabilization time (A); Continuously determining whether the time counted in the timer has passed the predetermined supply air temperature stabilization time (A); When the predetermined supply air temperature stabilization time (A) has elapsed, detecting the supply air temperature (Tin) through the air supply temperature detection sensor again and storing the detected supply air temperature (T2); Determining whether a temperature difference obtained by subtracting the reference supply air temperature (T1) from the reference supply air temperature (T2) is equal to or higher than a predetermined comparison target temperature (T3); If the temperature difference obtained by subtracting the reference supply air temperature (T2) from the reference supply air temperature (T1) is not equal to or higher than the predetermined comparison target temperature (T3), the air supply temperature stabilization time (A) count value is reset, Returning to the step of starting to count the predetermined supply air temperature stabilization time (A), and repeating the steps thereafter; If the temperature difference obtained by subtracting the reference supply air temperature (T2) from the reference supply air temperature (T1) is equal to or higher than a predetermined comparison target temperature (T3), the control unit recognizes that the exhaust air temperature is primarily deviated and forces the burner to be extinguished; Starting a post purge for operating the blowing fan at a predetermined number of revolutions for a predetermined time (B) after extinguishing the burner in the control section; Then, the pressure difference between two points on the air discharging portion of the air blowing fan is measured, and when the differential pressure between the two points is increased due to the deviation of the exhausting year, Determining whether the differential pressure switch is in an "on"state; Returning to a previous step of determining whether the post-purge time (B) has ended if the differential pressure switch is in the "off" state and, if not, determining whether the differential pressure switch is in the "on"state; And when the differential pressure switch is in the "on" state before the post purge time B ends, the exhaust flue is determined to be out of order and the post purge is stopped safely.

At this time, the predetermined supply air temperature stabilization time (A) is set to 30 to 60 seconds, and the predetermined comparison target temperature (T3) compared with the temperature difference of the result of the reference supply temperature (T1) .

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When the control unit determines that the differential pressure switch remains in the OFF state until the post purge time B ends after the forced extinguishment of the burner, the control unit determines that the exhaust gas is normally installed, And then returns and repeats the subsequent steps.

Further, when the post-purging is safely stopped by the control unit, the display unit of the temperature control device is further provided with an indication that an exhaust-year deviation error has occurred.

In this case, the post purge time (B) is set to 10 seconds to 5 minutes.

As described above, according to the present invention, the supply air temperature detected through the supply air temperature detection sensor provided in the supply portion of the heat exchanger during the boiler combustion is set to a predetermined supply air temperature stabilization time The air supply temperature difference before and after the set air supply temperature stabilization time is detected at intervals, and if the difference is equal to or higher than the predetermined comparison target temperature, the air supply is first recognized as a departure from the exhaust year and the burner is stopped (i.e., extinguished) It is possible to prevent the danger beforehand, that is, to secure the safety due to the exhaust gas leakage, and to improve the quality and reliability of the product itself.

Further, in the present invention, after the supply air temperature is detected and compared at every constant supply air temperature stabilization time, it is determined that the exhaust year is out of order, and the combustion of the burner is stopped (i.e., extinguished) A post purge for operating the blowing fan at a predetermined number of revolutions is performed for a predetermined period of time to discharge the air, and it is continuously judged whether the differential pressure switch installed in the air discharge portion of the blowing fan is in the " If the differential pressure switch is in the "ON" state before the end of the time, the exhaust flue is fully recognized as being in an out-of-position state, and if the exhaust flue is out of the error state, In addition, the boiler repairman, including the user, can accurately recognize the departure date of the exhaust year and take immediate action Air Products is very useful inventions, etc., which can dramatically improve the reliability of the products and services, including its own.

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.

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

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a schematic block diagram of a boiler to which the method of the present invention is applied, and FIG. 2 is a flow chart for explaining the method of the present invention.

According to the present invention,

(S1) of performing heating or hot water combustion in the control unit (1) when the power of the boiler is "on ";

(S2) of comparing the gas and air supply amount supplied to the burner with the user's set temperature (Tset) to compare the heating water or the indoor temperature and the hot water temperature with each other;

The supply air temperature Tin is detected through the supply air temperature detection sensor 2 provided at the supply portion of the heat exchanger and stored in the storage device 11 provided in the control unit 1 as the reference supply air temperature T1 (S3) of starting to count a predetermined supply air temperature stabilization time (A) using the timer (12) provided in the control unit (1);

(S4) whether the time counted by the timer (12) exceeds a predetermined supply air temperature stabilization time (A);

The supply air temperature Tin after the supply air temperature stabilization time A is detected again through the supply air temperature detection sensor 2 and the supply air temperature is stabilized by the comparison supply air temperature T2 to the storage device 11, (S5);

A step (S6) of judging whether a temperature difference obtained by subtracting the reference supply air temperature (T1) from the comparison supply air temperature (T2) is equal to or higher than a predetermined comparison target temperature (T3);

If the temperature difference obtained by subtracting the reference supply air temperature T2 from the reference air supply temperature T1 is not equal to or higher than the predetermined comparison target temperature T3 (No in S6), the air supply temperature stabilization time A count value is reset, (Tin) through the first supply temperature (Tin) 2 and storing it as the reference supply temperature (Tl) and returning to the step (S3) of starting counting the determined supply air temperature stabilization time (A) (S7);

If the temperature difference obtained by subtracting the reference supply air temperature T2 from the reference supply air temperature T1 is equal to or higher than the predetermined comparison target temperature T3 (Yes in S6), it is recognized that the exhaust year is deviated first and the burner is forcedly extinguished (S8).

At this time, the predetermined supply air temperature stabilization time (A) is set to 30 to 60 seconds, and the predetermined comparison target temperature (T3) compared with the temperature difference of the result of the reference supply temperature (T1) .

In addition, after the control unit 1 determines that the reference air supply temperature T1, the reference supply air temperature T2, and the predetermined comparison target temperature T3, the burner is extinguished (S8)

A step (S9) of starting a post purge for operating the blowing fan (5) at a predetermined number of revolutions for a predetermined time (B);

When the differential pressure between the two points is increased due to the deviation of the exhaust year while measuring the pressure difference between two points which are installed in the air discharge portion of the air blowing fan 5 and are spaced on the air discharge portion during the post purge, (S10) of determining whether the differential pressure switch 3 is in the "on" state;

If the differential pressure switch 3 is in the "off" state (No in S10), it is determined whether the post-purge time B has been terminated. (S11);

If the differential pressure switch 3 is in the "ON" state (Yes in S10) before the post-purge period B ends, the step S12 of confirming that the exhaust period is out of order and stopping the post- .

If the differential pressure switch 3 remains in the "off" state until the post purge time B has elapsed after the burner has been forcedly extinguished (S8) as determined by the control unit 1 (Yes at S11) No state is maintained), it is determined that the exhaust flue is normally installed, the operation returns to the initial combustion step S1, and the subsequent steps are repeated.

It is further characterized in that when the control unit 1 stops the post purging operation (S12), the display unit 41 of the temperature control unit 4 indicates that the exhaust-year deviation error has occurred.

In this case, the post purge time (B) is set to 10 seconds to 5 minutes.

Reference numeral 13 denotes an arithmetic unit provided in the control unit 1, 51 denotes a blowing fan drive unit, 6 denotes a supply temperature detection sensor, 7 denotes an ignition device, 8 denotes a flame detection device, Driving device.

The operation and effect of the method according to the present invention will now be described with reference to FIGS. 1 and 2. FIG.

First, when the power supply voltage is supplied to the boiler body and the temperature control device 4 in the control device 1 provided in the boiler, the ignition device 7, the gas supply drive device 9, (51) or the like is operated to perform the combustion according to the heating or hot water through the ignition of the burner (S1).

Next, the user compares the heating water or the indoor temperature and the hot water temperature with respect to the heating or hot water set temperature (Tset) set by the user through the temperature control device 4 and compares the rotation frequency of the blowing fan 5 To control the air supply amount, and at the same time, the amount of gas supplied to the burner is controlled through the gas supply drive device 9 (S2).

Thereafter, the control unit 1 detects the supply air temperature Tin to the air supplied to the combustor through the supply air temperature sensor 2 installed in the air supply unit of the heat exchanger (not shown) (S3) by using the timer (12) provided in the control unit (1) and counting the determined supply air temperature stabilization time (A).

At this time, the supply air temperature stabilization time (A) is determined by checking the supply air temperature (Tin) through an air supply temperature detection sensor (2) installed in the air supply part of the heat exchanger, and performing heat exchange between the air Is fully established and fully stabilized, and then it is set to 30 to 60 seconds in the present invention.

In this case, 30 to 60 seconds of the supply air temperature stabilization time (A) is the time for exchanging heat with the supply air through the flue when exhaust gas of a certain temperature is discharged through the flue, and stabilizing the temperature of the supply air to be supplied. , The heat exchange coefficient depending on the material of the flue, the difference between the exhaust temperature and the supply air temperature, and the amount of change in the exhaust temperature during the control of the heat amount. When the temperature is within 30 seconds, the exhaust gas temperature is irregular The supply air temperature may not be stabilized, and the maximum time of 60 seconds may be the estimated time for repeating the departure detection of the exhaust year.

Then, the control unit 1 continues to determine whether the time counted by the timer 12 has exceeded the predetermined supply air temperature stabilization time A (S4). If the predetermined supply air temperature stabilization time A has elapsed, The supply air temperature Tin after the supply air temperature stabilization time A is detected through the supply air temperature detection sensor 2 and stored in the storage device 11 at the comparison supply air temperature T2 in step S5.

Thereafter, the control unit 1 reads the reference supply temperature T1 and the reference supply temperature T2 stored in the storage device 11, respectively, and reads the comparison supply temperature T2 from the reference supply temperature T1 (S6) whether or not the temperature difference calculated above is equal to or higher than a predetermined comparison target temperature T3.

At this time, the comparison target temperature T3 is a temperature for detecting the departure of the exhaust year and is compared with the supply air temperature difference before and after the supply air temperature stabilization time (A) detected every 30 to 60 seconds as the air supply temperature stabilization time (A) And set at 3 to 5 DEG C, which is a temperature sufficiently changed to judge that the exhaust flue has deviated.

On the other hand, if it is determined that the temperature difference obtained by subtracting the reference supply air temperature T2 from the reference supply air temperature T1 is equal to or higher than the predetermined comparison target temperature T3 (No in S6: T1 - T2? T3 state (S7) in accordance with the supply air temperature stabilization time A previously counted by the timer 12 and detects the supply air temperature Tin through the air supply temperature detection sensor 2 to calculate the reference air supply temperature T1, and at the same time, the process returns to step S3 in which it starts counting the predetermined supply air temperature stabilization time A, and repeats the subsequent steps.

However, if the control unit 1 determines that the temperature difference obtained by subtracting the reference supply air temperature T2 from the reference air supply temperature T1 is equal to or higher than the predetermined comparison target temperature T3 (Yes in S6) And the burner is forcibly extinguished (S8). Thus, the primary safety is secured by eliminating the risk factors due to the exhaust gas leakage.

Thereafter, the control unit 1 operates the blowing fan 5 at a predetermined number of revolutions for a predetermined time B (for example, 10 seconds to 5 minutes) to discharge the unburned gas and residual exhaust gas in the combustion chamber to the outside A differential pressure switch 3 installed in the air discharge portion of the air blowing fan 5 is provided to start post purge (S9) as well as to determine whether or not the exhaust flue is deviated during the post purge, Quot; ON "state (S10).

At this time, the reason why the blower fan 5 is operated at a constant number of revolutions (post purge) and whether the differential pressure switch 3 is in the "on" state (S10) In the state where the exhaust flue is normally installed, the pressure difference switch 3 is kept in the "off" state due to the high internal combustion pressure of the combustion chamber. On the other hand, Since the internal pressure is low and the differential pressure switch 3 is turned "on ", it is possible to accurately determine whether or not the exhaust year is deviated.

Since the differential pressure switch 3 is provided in the air discharge portion of the blowing fan 5, the differential pressure switch 3 is connected to the combustion chamber connected to the air discharge portion, the exhaust flue connected to the combustion chamber, It is possible to output a signal when a pressure difference over a certain pressure is generated due to various installation environments and conditions such as combustion conditions. Therefore, the change amount of the supply air temperature due to the departure of the exhaust year is checked first and the signal of the pressure difference switch is checked. Can be confirmed.

Here, the operation differential pressure of the differential pressure switch 3 may be set differently depending on the capacity of the product, the installation environment, and the like.

If the state of the differential pressure switch 3 is determined by the control unit 1 as described above and the differential pressure switch 3 is in the "off" state (No in S10) (S11). If not, the flow returns to the previous step S10 to determine whether the differential pressure switch 3 is in the "on" state.

As a result of determining whether the differential pressure switch 3 is turned "on " during the 10-second to 5-minute post-purging in the controller 1 (S10) When the differential pressure switch 3 is turned "on" (Yes in S10), it is completely determined that the exhaust year is deviated and the execution of the post purge is stopped safely (S12).

In addition, in the present invention, when the differential pressure switch 3 is "on" during the post-purging operation as described above and the post-purging is safely stopped (S12) ) Indicates that the exhaust year miss error has occurred.

Accordingly, not only the safety due to the exhaust gas leakage can be further ensured, but also the boiler repairman accurately recognizes the state of departure from the exhaust through the error phrase displayed on the display unit 41 of the temperature control device 4 The necessary measures can be taken immediately, and the reliability according to the merchandise and service of the product itself can be greatly improved.

On the other hand, as a result of detecting the on / off state of the differential pressure switch 3 continuously until the post purge time B has elapsed after the burner has been forcedly extinguished (S8) in the control unit 1 (Yes in S11) When the differential pressure switch 3 is kept in the "OFF" state (No in S10) and the post purge time B is ended (Yes in S11), the exhaustion year is maintained in the normal state, It is determined that the temperature difference obtained by subtracting the reference supply air temperature T2 from the reference air supply temperature T1 at the step S6 is equal to or greater than the determined comparison target temperature T3 (Yes at S6) due to temporary backward flow or temporary clogging, It is recognized that the burner has been detached and the burner is forcibly extinguished (S8) (that is, it is determined that the exhaustion is normally installed), the process returns to the initial combustion step S1, and the subsequent steps are repeated.

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: control unit 11: storage device
12: Timer 13:
2: Supply air temperature sensor
3: Differential pressure switch
4: thermostat 41: display
5: blowing fan 51: blowing fan driving device
6: Supply temperature detection sensor
7: Ignition device
8: Flame detector
9: Gas supply drive device

Claims (6)

When the boiler is powered on,
Performing heating or hot water combustion in the control unit;
Then performing a calorie control;
Detecting an air supply temperature (Tin) and storing the air supply temperature (Tin) at a reference air supply temperature (T1), and starting counting a predetermined air supply temperature stabilization time (A);
Continuously determining whether a predetermined supply air temperature stabilization time (A) has elapsed;
If the predetermined supply air temperature stabilization time A has elapsed, detecting the supply air temperature Tin and storing it as a comparison supply air temperature T2;
Determining whether a temperature difference obtained by subtracting the reference supply air temperature (T1) from the reference supply air temperature (T2) is equal to or higher than a predetermined comparison target temperature (T3);
If the temperature difference obtained by subtracting the reference supply air temperature (T2) from the reference supply air temperature (T1) is not equal to or higher than the predetermined comparison target temperature (T3), the air supply temperature stabilization time (A) coefficient value is reset, Returning to the step of starting the counting of the predetermined supply air temperature stabilization time (A) at the same time as storing the air supply temperature stabilization time (T1) and repeating the subsequent steps;
If the temperature difference obtained by subtracting the reference supply air temperature (T2) from the reference supply air temperature (T1) is equal to or higher than a predetermined comparison target temperature (T3), the control unit recognizes that the exhaust air temperature is primarily deviated and forces the burner to be extinguished;
Starting a post purge for operating the blowing fan at a predetermined number of revolutions for a predetermined time (B) after extinguishing the burner in the control section;
Then, the pressure difference between two points on the air discharging portion of the air blowing fan is measured, and when the differential pressure between the two points is increased due to the deviation of the exhausting year, Determining whether the differential pressure switch is in an "on"state;
Returning to a previous step of determining whether the post-purge time (B) has ended if the differential pressure switch is in the "off" state and, if not, determining whether the differential pressure switch is in the "on"state;
When the differential pressure switch is in the "ON" state before the end of the post-purge period (B), it is determined that the exhaust year is off and the post-purging is stopped safely. Way. delete The method according to claim 1,
When the control section determines the state of the differential pressure switch until the post purge time (B) ends, if the differential pressure switch maintains the "off" state,
Wherein the control unit determines that the exhaust flue is normally installed, returns to the initial combustion step (S1), and repeats the steps thereafter.
The method according to claim 1,
When the controller pauses the post purge,
Wherein the display unit of the temperature control device indicates that an exhaust-year deviation error has occurred.
The method according to claim 1,
The supply air temperature stabilization time (A) is set to 30 to 60 seconds,
Wherein the predetermined comparison target temperature (T3) to be compared with the temperature difference between the reference supply temperature (T1) and the comparison supply air temperature (T2) is set to 3 to 5 占 폚.
The method according to claim 1,
Wherein said post purge time (B) is set to 10 seconds to 5 minutes.

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