KR101080524B1 - Combustion controlling method for preventing condensation water in primary heat exchanger in boiler - Google Patents

Abstract

The present invention relates to a combustion control method of a boiler for preventing the generation of condensate in a primary heat exchanger. In particular, in the known combustion control method of a boiler, when the water flow / water flow sensor in the hot water combustion atmosphere is “ON”, the ignition is performed. Starting counting for the elapsed time since the normal combustion at the same time when the normal ignition is performed; Continuously detecting whether the water flow / quantity detection sensor is “OFF” during the combustion operation; If the water flow / quantity sensor is “OFF” during the combustion operation, it is determined whether the water flow / water level sensor is “OFF” within the predetermined time (t1) after the start of combustion, and if it is within the specified time, the remaining time until the specified time has elapsed. Forcibly continuing combustion during the process; Detecting the temperature of the heating water through the heating tapping thermistor to determine the temperature in the primary heat exchanger during the forced combustion for the remaining time, and continuously determining whether the temperature is equal to or higher than the drain countermeasure temperature (T ° C.); As a result of the above determination, the water flow / quantity detection sensor is “OFF” after a predetermined time (t1), or after forced combustion for the remaining time, fire extinguishing is performed or the heating water temperature is detected through a heating tapping thermistor during forced combustion. As a result, when the drain counter temperature (T ℃) or more, the step of extinguishing immediately to prevent burns at the time of boiling or re-melting and operating the post fan for a predetermined time (t2); characterized in that consisting of.

Therefore, condensate generation conditions in the primary heat exchanger can be prevented in advance, which can prevent the boiler from shortening due to condensate and also prevent the occurrence of ignition failure in the combustion chamber due to the generation of condensate by the drain. In addition, the frequent on / off of hot water can prevent the so-called hot / cold water sandwich phenomenon, in which “hot water-cold water-hot water” is repeatedly generated in the hot water pipe, which can greatly improve the usability and reliability of the product. will be.

Boiler, Primary Heat Exchanger, Drain, Condensate, Water / Water Sensor, Post Fan

Description

Combustion controlling method for preventing condensation water in primary heat exchanger in boiler}

The present invention relates to a combustion control method of a boiler for preventing the generation of condensate in a primary heat exchanger, and more particularly, when a fire extinguishing condition is achieved within a predetermined time (for example, 4-6 seconds) from the start of combustion of hot water. By forced combustion until the elapsed time, the dew point temperature inside the primary heat exchanger is increased to prevent the generation of condensate generated in the primary heat exchanger due to frequent ON / OFF of hot water, which shortens the life of the boiler. In addition, it is possible to prevent ignition defects in the combustion chamber due to the generation of condensed water by the drain, and the so-called hot and cold water sandwich in which "hot water-cold water-hot water" exists in the hot water pipe due to frequent ON / OFF of hot water. It is invented so that a phenomenon may be prevented beforehand.

In recent years, while there is an urgent need for water shortages worldwide, the use of a foot pedal switch, a sensor faucet using an infrared ray, a touch sensor, and the like for saving water is increasing in each home.

It is true that the use of these products has a great effect on preventing the use of unnecessary water. However, when using hot water using these products, the hot water is turned on and off too frequently, which causes problems such as condensation water generated in the boiler's primary heat exchanger.

In other words, when hot water is used in boilers, if ignition / digestion is repeated by frequent ON / OFF, condensed water is generated inside the primary heat exchanger, and this condensed water reduces the life of the boiler or causes the boiler to malfunction. there is a problem.

In the normal combustion sequence, the fan operates variously in the operation of the boiler, but pre-purges the fan for a certain period of time to discharge the live gas or waste gas inside the combustion chamber before the ignition operation. After the heating or hot water combustion, as well as post-fan (POST-FAN) operation to operate the blower fan for a certain time to discharge the waste gas in the combustion chamber.

In addition, the circulation pump serves to heat the water heated by the primary heat exchanger with direct water through the secondary heat exchanger to supply hot water to the user.

On the other hand, frequent on / off of hot water frequently repeats the combustion and extinguishing of the boiler, and during ignition or extinguishing, the temperature inside the primary heat exchanger is drastically reduced by PRE-PURGE or POST-FAN and circulation Water that is not properly heated by the driving of the pump flows out of the primary heat exchanger into the secondary heat exchanger, and then the temperature of the water in the pipe is further lowered by cold direct water in the secondary heat exchanger.

When this water flows back into the primary heat exchanger, the temperature inside the boiler's primary heat exchanger is further cooled.

When the cooling is repeatedly performed for a long time, condensed water is generated on the surface of the pipe or the fin inside of the primary heat exchanger by water vapor from the waste gas after combustion, cold air or wet air introduced from the outside.

The condensate thus generated corrodes the inside of the primary heat exchanger, shortening the life of the boiler, or preventing salt holes in the primary heat exchanger, causing problems such as poor ignition.

Thus, although the countermeasure against condensate generation in the use of the boiler is one of the important issues that determine the life of the product, the hot water combustion control method in the conventional boiler as shown in FIG. When the water flow / quantity sensor is “on” in the hot air combustion atmosphere, which performs only basic operations to prevent freezing and prevent freezing, the combustion request is permitted after ignition operation is allowed. If the water flow / quantity sensor is “off” due to the user's stoppage of the hot water in the absence of water, post-fan (POST-FAN) operation is performed to operate the blower fan for a certain time to release the waste gas in the combustion chamber. The process was done.

In addition, several boilers have been applied to some boilers in order to eliminate condensate generation conditions, which occur internally and externally of the primary heat exchanger. The technology for extinguishing the primary heat exchanger when the minimum heat quantity is forcibly increased or when the condensate generation condition is detected by using the heating outlet and the return temperature thermistor has been proposed. It is true that countermeasures against condensate generation have not been solved.

In addition, since the cooling process inside the primary heat exchanger is repeated by the operation of a blower fan or a circulating pump even when hot water is used on and off as well as frequent on / off of hot water, the condensate generation is increased.

In other words, in the conventional boiler, frequent on / off of hot water during combustion operation lowers the temperature inside the primary heat exchanger by PRE-PURGE before ignition and by POST-FAN during fire extinguishing, and at the same time, The water in the pipe that is not heated properly by the cold heat through the secondary heat exchanger is further dropped, and it flows back into the primary heat exchanger to further cool down the temperature inside the primary heat exchanger. Condensed water is generated in the pipe or fin due to inflow of steam, cold outside air, inflow of wet air, etc., to corrode the inside of the first heat exchanger. There is a problem such as blocking the salt hole, such as ignition failure occurs.

The present invention has been made to solve such a conventional problem, the water flow / quantity detection sensor is "ON" due to the use of the user's hot water, the water flow / quantity sensor within a predetermined time after the ignition for hot water combustion is made If the water flow / quantity sensor is “OFF” within the designated time (for example, 4-6 seconds) from the start of combustion, the remaining time at the set time is independent of the “OFF” state of the water / flow sensor. Combustion continues forcibly until time elapses, and if the temperature of the heating tapping thermistor is detected during forced combustion and the drain countermeasure temperature having a constant temperature (for example, 47-52 ° C.) or more is burned or burned, By extinguishing immediately for prevention, it eliminates condensate generation conditions in the primary heat exchanger and prevents the boiler from shortening. It is possible to prevent the occurrence of ignition failure in the combustion chamber due to the generation of condensed water by la drainage. Also, the so-called hot and cold sandwich, in which "hot water-cold water-hot water" is repeatedly formed in the hot water pipe due to frequent ON / OFF of hot water The purpose of the present invention is to provide a combustion control method of the boiler for preventing condensate generation in the primary heat exchanger, which can prevent the phenomenon in advance and greatly improve the usability and reliability of the product.

The present invention for achieving the above object, the heating tapping thermistor and the primary and secondary heat exchanger, combustion chamber, frame rod, water / quantity sensor, key input unit, display unit, power supply unit, blowing fan drive unit, blowing fan, circulation pump In the combustion control method of a boiler having a driving unit, a circulation pump, a three-way driving unit, a three-way side, an igniter driving unit, an igniter and a control unit to control combustion operation and blower fan operation when the user uses hot water, and provides hot water. When the water flow / quantity sensor in the air is turned “ON”, igniting for hot water combustion, and when normal ignition is performed, starting counting for an elapsed time after normal combustion at the same time as normal combustion operation; Continuously detecting whether the water flow / quantity detection sensor is “OFF” during the combustion operation; If the water flow / quantity sensor is “OFF” during the combustion operation, it is determined whether the water flow / water level sensor is “OFF” within the predetermined time (t1) after the start of combustion, and if it is within the specified time, the remaining time until the specified time has elapsed. Forcibly continuing combustion during the process; Detecting the temperature of the heating water through the heating tapping thermistor to determine the temperature in the primary heat exchanger during the forced combustion for the remaining time, and continuously determining whether the temperature is equal to or higher than the drain countermeasure temperature (T ° C.); As a result of the above determination, the water flow / quantity detection sensor is “OFF” after the predetermined time (t1), or the fire extinguishing operation is performed after the forced combustion is performed for the remaining time, or the heating water temperature is detected through the heating tapping thermistor during the forced combustion. As a result, when the drain counter temperature (T ℃) or more, the step of extinguishing immediately to prevent burns at the time of boiling or re-melting and operating the post fan for a predetermined time (t2); characterized in that consisting of.

At this time, the time (t1, t2) defined above is 4-6 seconds and 2-4 seconds, respectively, characterized in that the drain countermeasure temperature (T1) is 47-52 ℃.

As described above, according to the present invention, the water flow / quantity detection sensor is “ON” due to the use of hot water by the user, so that the ignition is performed for the hot water combustion in the boiler, and when the normal combustion starts, the counting time starts from the normal combustion start time. It is determined whether the water flow / quantity sensor is “OFF” within the range of time. If the water flow / quantity sensor is “OFF” within 4-6 seconds after the start of combustion, Regardless of the time remaining in the fixed time, the combustion is forcibly continued, and the tapping temperature of the heating water is detected through the heating tapping thermistor while the forced burning is in progress. Detects the temperature and prevents burns when boiling or re tapping when the drain counter temperature (eg 47-52 ℃) has a certain temperature. After extinguishing, post fan operation is performed for a fixed period of time to eliminate condensate generation conditions in the primary heat exchanger. This prevents the boiler from shortening its life due to condensate. It is possible to prevent the occurrence of poor ignition of the product, and also to prevent the so-called hot and cold water sandwich phenomenon in which the "hot water-cold water-hot water" repeatedly occurs in the hot water pipe due to frequent ON / OFF of the hot water. It is a very useful invention that can greatly improve the usability and reliability itself.

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

Figure 2 shows a schematic block diagram of a boiler to which the present invention is applied, Figure 3 shows a block diagram of a controller of a boiler to which the present invention is applied, Figure 4 shows a flowchart for explaining the method of the present invention. .

According to the present invention, the heating tapping thermistor (3) and the primary and secondary heat exchanger (1) (2), the combustion chamber (4), the frame rod (5), water flow / quantity sensor (6), key input unit ( 7), display unit 8, power supply unit 9, blower fan drive unit 10, blower fan 11, circulation pump drive unit 12, circulation pump 13, three-way drive unit 14, three-way side 15 In the combustion control method of the boiler having a igniter driving unit 16, the igniter 17 and the control unit 18, and controls the combustion operation and blower fan operation when the user uses the hot water,

In the hot water combustion atmosphere, the controller 18 continuously detects whether the water flow / quantity detection sensor 6 is “ON”, and when the water flow / quantity detection sensor 6 is “ON” due to the user's use of hot water, a combustion request is issued. Permitting and performing ignition for hot water combustion to start counting for a predetermined elapsed time t1 after the normal combustion at the same time when the normal ignition is performed;

Continuously detecting whether the water flow / quantity detection sensor 6 is “OFF” during counting and combustion operation for a predetermined time t1;

If the water flow / quantity sensor is “OFF” during the combustion operation, it is determined whether the time point is within the set time (t1) after the start of combustion, and if it is within the set time, the combustion is forcibly performed for the remaining time until the set time has elapsed. Continuing;

While the forced combustion is in progress for the rest of the time, the heating water temperature is detected through the heating tapping thermistor 3 to determine the temperature in the primary heat exchanger 1, and the temperature is kept above the drain countermeasure temperature (T ° C). Judging;

As a result of the above determination, the water flow / quantity detection sensor 6 is “OFF” after a predetermined time t1, or after the forced combustion is performed for the rest of the time, the fire extinguishing operation is performed, or through the heating tapping thermistor 3 during the forced combustion. When the heating water temperature is detected and the drain countermeasure temperature (T ° C.) or more is reached, the fire extinguishing is performed immediately to prevent burns during boiling or re-melting, and the post fan is operated for a predetermined time (t2) to return to the initial state. Characterized in that made.

At this time, the predetermined time (t1, t2) is 4-6 seconds and 2-4 seconds, respectively, characterized in that the drain countermeasure temperature (T1) is 47-52 ℃.

Referring to the effect of the combustion control method of the boiler for preventing the condensate generation in the present invention configured as described above is as follows.

First, the boiler to which the present invention is applied is installed on the heating water outlet side of the primary heat exchanger 1 as shown in FIGS. 1 and 2, and the heating tapping thermistor 3 detecting the temperature of the heating water and the combustion chamber Primary heat exchanger (1) for heating the heating water by the heat generated when the gas is burned in (4), to heat the hot water through heat exchange with the heating water discharged from the primary heat exchanger (1) Secondary heat exchanger (2), the frame rod (5) for detecting ignition and failure of the ignition in the combustion chamber (4), when the user opens the faucet for using hot water to detect the flow of hot water as an electrical signal Water flow / quantity detection sensor 6 to pull out, a key input unit 7 for allowing a user to input various key signals for hot water / heating, a display unit 8 for displaying various state information, and a power supply for driving each unit Voltage supply A circulating pump for driving the circulating pump 13 in response to an output signal of the blowing fan drive unit 10 and the control unit 18 in response to the output signal of the unit 9 and the control unit 18. In response to the output signal from the drive unit 12 and the control unit 18, the three-way drive unit 14 for switching the heating water to the heating pipe or the secondary heat exchanger 2 side, and the igniter in response to the output signal from the control unit 18 17 is provided with an igniter drive unit 16 for operating the control unit 18 for performing a predetermined control program and performing the overall control function of the boiler.

The control unit 18 of the boiler configured as described above continuously receives the state information of the water flow / quantity detection sensor 6 in the hot air combustion atmosphere which performs the basic operation of preventing freezing of the trilateral valve and the circulation pump and preventing freezing. It is determined whether the water flow / quantity detection sensor 6 is “ON” due to the user using hot water.

As a result, when the water flow / quantity detection sensor 6 is “ON”, the combustion request of the user is allowed, the gas supply control proportional valve 19 is opened for hot water combustion, and the igniter 17 is operated through the igniter driver 16. Drive) and check whether the ignition is normally performed through the frame rod 5, and if the normal ignition is performed, the counter (not shown) provided in the control unit 18 itself at the same time as the normal combustion operation is performed. Through the ignition starts counting for a predetermined elapsed time (t1) from the time of normal combustion.

Of course, even if the igniter 17 is operated in the above, if normal ignition is not performed or if misfire occurs due to external factors after the normal combustion operation, the igniter 17 is operated again to perform normal ignition and combustion. In addition, if the normal combustion is achieved, the counter value of the previously set time t1 is reset, and the counting for the set elapsed time t1 is restarted.

As described above, while the normal combustion is performed and the predetermined time t1 is counted, the controller 18 continuously receives the state information of the water flow / water quantity sensor 6 in real time to stop the user from using the hot water. When the "OFF" signal is input from the water flow / quantity detection sensor 6, it is determined whether the time point is within a predetermined time t1 after the start of combustion. Combustion will continue forcibly for the rest of the time.

At this time, the predetermined time t1 is 4-6 seconds from the time when combustion starts normally. If the water flow / quantity detection sensor 6 is within 1-5 seconds, for example, before 4-6 seconds has elapsed after the normal combustion starts. OFF ", if the combustion operation is forced to proceed further for a short time for the remaining time of 4-1 seconds, it can raise the dew point temperature in the combustion chamber, so that condensed water is generated inside the primary heat exchanger (1). It can be prevented in advance.

On the other hand, the water flow / quantity sensor 6 is "OFF" within 4-6 seconds, which is a predetermined time (t1) from the time when the hot water combustion is started normally as described above, the control unit during the forced combustion for the remaining time ( 18), the temperature in the primary heat exchanger (1) is higher than the drain counter temperature (T ℃) through the heating tapping thermistor (3) in order to prevent burns due to forced combustion or burns caused by hot water at the time of re- tapping. You will continue to judge if you are up for the rest of the time.

As a result of judging at each step, the water flow / quantity detection sensor 6 is “OFF” after a predetermined time t1, or the extinguishing operation is performed after the forced combustion progresses for the remaining time, or the heating tapping thermistor during the forced extinguishing operation. As a result of detecting the heating water temperature through (3), if the drainage countermeasure temperature (T ° C) is 47-52 ° C or more, the burner combustion is immediately extinguished to prevent burns during boiling or reheating. By operating the post fan for 2-4 seconds (t2), the temperature drop in the primary heat exchanger (1) can be reduced, so that condensate can be suppressed in the heat exchanger. do.

As described above, when the water flow / quantity detection sensor 6 is “ON” and the ignition and combustion start normally, the water flow / quantity detection sensor 6 counts from that time within 4-6 seconds, which is a predetermined time t1. Is determined to be " OFF ", and if the water flow / quantity sensor 6 is “OFF” within 4-6 seconds after the start of combustion, irrespective of the “OFF” state of the water flow / quantity sensor 6 Combustion is forcibly continued until the remaining time at a predetermined time elapses, and the tapping temperature of the heating water is detected through the heating tapping thermistor 3 while the forced burning is in progress as described above. When the temperature inside the heat exchanger 1 is detected and the drain countermeasure temperature (T1) is higher than 47-52 ° C, the post fan is operated for 2-4 seconds after the fire extinguishing for a predetermined time (t2) to prevent burns during boiling or re- tapping. In the primary heat exchanger (1) by It can eliminate the condition of generating water in advance and prevent the shortening of the life of the boiler itself. Also, it is possible to prevent the occurrence of ignition failure in the combustion chamber due to the generation of condensed water by the drain. It is possible to prevent the "hot water-cold water-hot water" situation reversal (cold and hot water sandwich phenomenon) in the hot water pipe generated by the OFF in advance, which can greatly improve the usability of the product and the reliability itself.

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1 is a flow chart for explaining a combustion control method in a conventional boiler.

2 is a schematic configuration diagram of a boiler to which the present invention is applied.

3 is a block diagram of a controller of a boiler to which the present invention is applied.

4 is a flowchart for explaining the method of the present invention.

Explanation of symbols on the main parts of the drawings

1,2: 1st and 2nd heat exchanger 3: Heating tapping thermistor

4: combustion chamber 5: frame rod

6: Water flow / quantity detection sensor 7: Key input unit

8: display unit 9: power supply unit

10: blower fan drive unit 11: blower fan

12: circulating pump drive unit 13: circulating pump

14: three-sided driving unit 15: three-way

16: igniter drive unit 17: igniter

18: control unit 19: proportional valve

Claims (5)

In the combustion control method of the boiler, Performing a ignition for hot water combustion and determining whether normal ignition is performed when the water flow / quantity detection sensor in the hot water combustion atmosphere is “ON”; Starting counting for the elapsed time after the normal combustion at the same time when the normal ignition is performed; Continuously detecting whether the water flow / quantity detection sensor is “OFF” during the combustion operation; If the water flow / quantity sensor is “OFF” during the combustion operation, it is determined whether the water flow / water level sensor is “OFF” within the predetermined time (t1) after the start of combustion, and if it is within the specified time, the remaining time until the specified time has elapsed. Forcibly continuing combustion during the process; As a result of the above determination, the water flow / quantity detection sensor is “OFF” after a predetermined time t1, or after the forced combustion is performed for the remaining time, extinguishing and operating a post fan for a predetermined time t2. A combustion control method of a boiler for preventing the generation of condensate in a primary heat exchanger. The method according to claim 1, Detecting the temperature of the heating water through a heating tapping thermistor to determine the temperature in the primary heat exchanger during the forced combustion for the remaining time, and continuously determining whether the temperature is above the drain countermeasure temperature (T ° C.); If the heating water temperature is determined to be above the drain countermeasure temperature (T ℃) as determined above, the step of extinguishing immediately to prevent burns during boiling or re-elution and operating the post fan for a predetermined time (t2); A combustion control method of a boiler for preventing the generation of condensate in a primary heat exchanger. The method according to claim 1, Combustion control method of the boiler for preventing the generation of condensate in the primary heat exchanger, characterized in that the predetermined time (t1) is 4-6 seconds. The method according to claim 2, Combustion control method of the boiler for preventing the generation of condensate in the primary heat exchanger, characterized in that the predetermined time (t2) is 2-4 seconds. The method according to claim 2, The drain countermeasure temperature (T1) is a combustion control method of the boiler for preventing the generation of condensate in the primary heat exchanger, characterized in that 47-52 ℃.

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