KR20110067600A - Dew condensation preventing method for inner combustion chamber in condensing boiler - Google Patents

Abstract

PURPOSE: A method for preventing dew condensation in a combustion chamber of a condensing boiler is provided to prevent ignition fail by preventing the clogging of the hole of boiler nozzle part by dew condensation. CONSTITUTION: A method for preventing dew condensation in a combustion chamber of a condensing boiler is as follows. If it has combustion demand, an igniter operates, and detection of flame is determined(S1,S2,S3). If flame is detected, the combustion is performed(S4) It continuously judges whether fire extinguishment is required or not(S5). If the fire-extinguishing demand is inputted, it determines whether the temperature of external air is higher than a fixed temperature(A°C)(S6,S7). If the temperature of outside is higher than the fixed temperature, a blowing fan rotates in predetermined revolution speed for a predetermined time(S8,S9).

Description

Dew condensation preventing method for inner combustion chamber in condensing boiler}

The present invention relates to a method for preventing condensation inside a combustion chamber of a condensing boiler, and more particularly, to prevent ignition failure due to a blockage of a nozzle hole due to condensation in a boiler nozzle part, and when extinguished after a short combustion in cold winter temperatures. Prevents condensation of combustion gas containing water vapor in the combustion chamber and air heated by heat from dew condensation on the surface of cold nozzles. In particular, in the case of a windy winter, a back wind blows into the exhaust port to prevent exhaust gas emissions. Even if it is invented to completely prevent the condensation generated in the combustion chamber by completely discharging the combustion gas containing steam in the combustion chamber.

In general, condensing (heat recovery type) boiler absorbs sensible heat first and absorbs latent heat discharged to exhaust gas secondly, so the temperature of exhaust gas of general boiler is 150-260 ℃, whereas condensing boiler is 50-100 ℃. The heat can be recovered to achieve high efficiency of more than 95%.

On the other hand, since the exhaust conditions of the combustion chamber in a general boiler are smoother than that of a condensing boiler, the combustion chamber after combustion is performed even with a conventional post fan rotation speed (for example, 230-240 Hz) and time (for example, 12-13 seconds). The internal combustion gas was discharged smoothly, and the ventilation was good even without cooling the inside of the combustion chamber. Even in the winter when the outside temperature was low, the nozzle hole was not clogged due to the condensation phenomenon of the gas nozzle.

However, condensing boilers have the same POST FAN rotational speed (eg 230-240 Hz) and time (eg 12-13 seconds), despite the fact that the exhaust load in the combustion chamber is much higher than that of ordinary boilers. There is no problem in the general condition that does not increase, but in winter, there is a lot of wind and strong season, the exhaust load is increased by the reverse wind, so the combustion gas is not discharged smoothly after combustion, and the inside of the combustion chamber is not cooled enough. The dew condensation on the surface of the cold nozzle portion, even clogging the nozzle hole caused a problem that the ignition operation is not performed.

The present invention has been made to solve such a conventional problem, to prevent the ignition failure due to clogging of the nozzle hole by condensation in the boiler nozzle portion, the internal combustion chamber when fired after short combustion in cold winter Combustion gas containing steam and air warmed by heat prevent dew condensation on the surface of cold nozzle part. Also, in the case of windy winters, backwind blows to the exhaust port to prevent exhaust gas emissions. Edo provides a method for preventing condensation in the combustion chamber of a condensing boiler that can completely improve the reliability of the condensing boiler's combustion by completely discharging the combustion gas containing the steam inside the combustion chamber. Its purpose is to.

In order to achieve the above object, the present invention provides a combustion request detector, a flame detector, a tapping temperature detector, an outside temperature detector, a water flow sensor, a water level sensor, a controller, a data memory, a blower fan drive, a fan rotation speed detector, and a gas valve. A method for preventing condensation from occurring in a combustion chamber of a condensing boiler having a driving unit, an igniter, a circulation pump driving unit, and a display unit, the method comprising: determining in real time whether there is a combustion operation request in the control unit; Operating a igniter and determining if a flame is detected if there is a combustion operation request; Determining whether there is a fire extinguishing request while proceeding with combustion when the flame is detected; Extinguishing the gas by blocking gas if there is a demand for extinguishing; Determining whether the outside air temperature is higher than a predetermined temperature (A ° C.) during the extinguishing operation; As a result of the above determination, if the outside temperature is higher than a predetermined temperature (A ° C.), driving and terminating the blower fan at a predetermined rotation speed (B Hz) for a predetermined time (C sec).

As a result of the determination, if the outside temperature is not higher than a predetermined temperature (A ° C.), the blowing fan is driven and terminated for a predetermined time (C ′ sec) at a predetermined rotation speed (B ′ Hz).

At this time, the predetermined temperature (A ℃) is 9-12 ℃, the predetermined number of revolutions (B Hz) (B 'Hz) of the blowing fan is 221-240Hz and 221-280Hz, respectively, the predetermined time (C sec) (C 'sec) is 28-32 seconds and 175-185 seconds, respectively.

As described above, according to the present invention, it is possible to prevent the nozzle hole of the boiler nozzle from being blocked by condensation by allowing the post fan to be driven for a predetermined time even after combustion of the boiler so as to exhaust the exhaust gas sufficiently. It is possible to prevent the ignition failure caused by the cold, and even if the fire is extinguished after a short combustion in the cold winter, the combustion gas containing steam and the air warmed by the heat condensed with dew on the surface of the cold nozzle part. It can prevent the condensation generated in the combustion chamber by completely discharging the combustion gas including water vapor in the combustion chamber even when a back wind blows into the exhaust port in the windy winter to prevent the emission of exhaust gas. As a result of the combustion operation of the condensing boiler itself, Also very useful inventions, etc. can be greatly improved.

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

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

According to the present invention, the combustion request detection unit 1, the flame detection unit 2, the tapping temperature detection unit 3, the outside temperature detection unit 4, the water flow sensor 5, the water level sensor 6, the control unit 7 , Condensing with data storage section 8, blower fan drive section 9, fan speed detection section 10, gas valve drive section 11, igniter 12, circulation pump drive section 13 and display section 14 In implementing a method for preventing condensation from occurring inside a combustion chamber of a boiler,

A step (S1) of continuously receiving an output signal of the combustion request detection unit 1 in real time from the control unit 7 to determine whether there is a combustion operation request;

Activating the igniter 12 when there is a request for combustion operation (S2) and determining whether the flame is detected through the flame detection unit 2 (S3);

Determining whether there is a fire extinguishing request while proceeding with combustion (S4) as a result of the determination as described above (S5);

As a result of the above determination, if there is a fire extinguishing request, blocking the gas to extinguish the fire (S6);

Determining whether the outside air temperature detected by the outside air temperature detector 4 during the extinguishing operation is higher than a predetermined temperature (A ° C.) previously determined by the data (S7);

As a result of the determination, if the outside temperature is higher than the predetermined temperature (A ° C.), the blowing fan driving unit 9 drives the blowing fan at a predetermined rotation speed (B Hz) for a predetermined time (C sec) and then ends (S8, S9); characterized in that consisting of.

As a result of the determination (S7), if the outside temperature is not higher than the predetermined temperature (A ° C.), the blowing fan is carried out for a predetermined time (C 'sec) at a predetermined rotation speed (B' Hz) and ends (S10, S11). It features.

At this time, the predetermined temperature (A ℃) is 9-12 ℃, the predetermined number of revolutions (B Hz) (B 'Hz) of the blowing fan is 221-240Hz and 221-280Hz, respectively, the predetermined time (C sec) (C 'sec) is 28-32 seconds and 175-185 seconds, respectively.

Referring to the effect of the condensation prevention method inside the combustion chamber of the present invention the condensing boiler consisting of such steps as follows.

First, in the known condensing boiler, in the known condensing boiler, when the fire extinguishing operation is performed after the combustion of the boiler is made by changing a part of the control program in the control unit 7, the operation of the blower fan is not stopped immediately, and the predetermined predetermined temperature is determined by the outside air temperature and data. By comparing the temperature (A ℃) with each other, the blower fan is further driven for a predetermined time (C sec or C 'sec) at a predetermined rotation speed (B Hz or B' Hz) according to the difference. The main technical components are to allow the exhaust gas to be sufficiently discharged to the outside and to sufficiently cool the inside of the combustion chamber.

At this time, the combustion request detection unit 1 installed in the known condensing boiler detects whether a combustion request signal is input from a room cone or the like and transmits the signal to the control unit 7, and the flame detection unit 2 is a flame rod. By detecting whether the ignition is properly made through, the tapping temperature detector 3 detects the temperature of the heating water and hot water discharged from the heat exchanger, the outside temperature detector 4 detects the outside temperature of the boiler body .

In addition, the water flow sensor 5 detects the use of hot water, the water level sensor 6 detects the water level in the water tank, the control unit 7 performs the overall control function for the electrical equipment of the boiler, The data storage section 8 stores various kinds of data, including a control program, and the blower fan drive section 9, the gas valve drive section 11, and the circulation pump drive section 13 output the control section 7, respectively. In response to the signal, the blower fan, the gas valve and the circulating pump are driven, the igniter 12 generates an initial ignition spark, and the fan speed detector 10 detects the actual revolution speed of the blower fan. Denotes the operating state of the boiler and the predetermined temperature.

Meanwhile, when the power supply voltage is normally supplied, the control unit 7 receives the output signal of the combustion request detection unit 1 in real time and continuously determines whether there is a combustion operation request (S1). The operation 12 is performed (S2) and the flame detection unit 2 detects whether the ignition is normally performed (S3).

As a result, when the flame is detected, it is determined whether there is a fire extinguishing demand (S5) while the normal combustion operation is carried out (S4). As a result, the fire extinguishing operation is performed by blocking the gas (S6) and then during the fire extinguishing operation. It is determined (S7) whether the outside temperature detected by the outside temperature detection unit 4 is higher than a predetermined temperature (A ° C .; for example, 9-12 ° C.) predetermined as data.

As a result of the extinguishing request, the burner fan is extinguished when the outside air temperature is higher than the predetermined temperature (A ℃). Through the driving unit 9, the blowing fan is driven (S8, S9) for a predetermined time (C sec; for example, 28-32 seconds) at a predetermined rotation speed (B Hz; for example, 221-240 Hz).

That is, if the outside air temperature is higher than 9-12 ℃, which is a predetermined temperature (A ℃), it is judged that it is not in winter when the dew condensation is unlikely, and it is determined after the fire extinguishing time (C sec), that is, the predetermined rotation speed (B Hz) for 28-32 seconds. Since 221-240Hz drives the blower fan more, post fan time is longer than that of a general boiler, and the combustion gas can be discharged smoothly.

On the other hand, if the outside air temperature is not higher than the predetermined temperature (A ℃) as determined above, the blowing fan is a predetermined time (C 'sec) at a predetermined rotation speed (B' Hz; for example, 221-280 Hz) (for example, 175-185 Seconds) and then finish (S10, S11).

That is, if the outside air temperature is not higher than the user's predetermined temperature (A ℃) of 9-12 ° C, the outside air temperature is determined to be low during the winter season, and the predetermined number of revolutions (C 'sec) after fire extinguishing is determined for a predetermined time (175'-185 seconds). By driving the blower fan at 221-280 Hz (B 'Hz), not only can the exhaust gas and the steam give off a lot of air, but also cool the inside of the combustion chamber sufficiently.

At this time, when the outside temperature is not higher than the user's predetermined temperature (A ° C) of 9-12 ° C, the fan is rotated faster than the outside temperature is higher than the user's predetermined temperature (A ° C) (ie, 221-280 Hz). ) For longer periods of time (i.e. 175-185 seconds), even if it is extinguished after a short combustion in cold winters. This is to cool the inside of the combustion chamber sufficiently to prevent condensation by dew on the nozzle surface.

Thus, in the present invention, even after combustion of the condensing boiler, the exhaust fan can be sufficiently discharged by driving the post fan longer for a predetermined time, so that the nozzle hole of the boiler nozzle can be prevented from being blocked by condensation. It is possible to prevent the ignition defect caused by the fire, and even if the temperature is extinguished after a short burning in the cold winter, the combustion gas containing steam and the air warmed by the heat condensation on the surface of the cold nozzle part with dew. It can be prevented in advance, and even in the case of windy winters, when the back wind blows to the exhaust port and prevents the emission of exhaust gas, it is possible to completely discharge the combustion gas including water vapor in the combustion chamber, thereby completely preventing condensation from the combustion chamber. You can do it.

Although the above-described embodiments have been described with respect to the most preferred embodiments of the present invention, it is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications can be made without departing from the technical spirit of the present invention.

1 is a block diagram of a condensing boiler to which the present invention is applied.

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

Explanation of symbols on the main parts of the drawings

1: combustion request detection unit 2: flame detection unit

3: tapping temperature detection unit 4: outside temperature detection unit

5: Water flow sensor 6: Water level sensor

7: control unit 8: data storage unit

9 blowing fan drive unit 10 fan rotation speed detection unit

11 gas valve driving unit 12 igniter

13 circulation pump driving unit 14 display unit

Claims (5)

In implementing a method for preventing condensation from occurring inside a combustion chamber of a condensing boiler, Operating the igniter and determining whether a flame is detected when there is a combustion operation request in the control unit; Determining whether there is a fire extinguishing request while proceeding with combustion when the flame is detected; If there is a fire extinguishing request, performing a fire extinguishing operation and then determining whether the outside air temperature is higher than a predetermined temperature (A ° C.); If the outside temperature is higher than the predetermined temperature (A ℃) as a result of the determination as described above, driving and terminating the blower fan for a predetermined time (C sec) at a predetermined rotation speed (B Hz); interior of the combustion chamber of the condensing boiler, characterized in that consisting of How to prevent condensation The method according to claim 1, As a result of the above determination, if the outside temperature is not higher than a predetermined temperature (A ° C.), the blower fan is driven and terminated at a predetermined rotation speed (B ′ Hz) for a predetermined time (C ′ sec). Prevention method. The method according to claim 1 or 2, The predetermined temperature (A ℃) is 9-12 ℃ characterized in that the condensing boiler internal condensation prevention method of the combustion chamber. The method according to claim 1 A predetermined rotation speed (B Hz) of the blower fan is 221-240 Hz, and a predetermined time (C sec) is 28-32 seconds. The method according to claim 2, The rotation speed (B 'Hz) of the blowing fan is 221-280Hz, the predetermined time (C' sec) is 175-185 seconds condensation prevention method in the combustion chamber of the condensing boiler, characterized in that.

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