JP2016180571A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device capable of suppressing dew condensation near an air supply/exhaust top even in a single operation to operate only one of two burners.SOLUTION: In a combustion device including a first burner 1 and a second burner 12, and a first combustion blower 5 for supplying combustion air to the first burner 1 and a second combustion blower 16 for supplying combustion air to the second burner 12, and implementing a simultaneous operation by the first burner 1 and the second burner 12, or a single operation by one of them, as a rotational frequency of the combustion blower at a non-operated burner side is determined by fire power at an operated burner side in the single operation at one side, inflow of a combustion gas to the non-operated burner can be prevented, and an exhaust temperature of the combustion gas is kept at a proper temperature causing little dew condensation, thus generation of dew condensation of water vapor in an exhaust gas can be reduced even when the temperature of the exhaust gas near a supply/exhaust top is lowered.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a combustion apparatus including a stove burner for a stove and a boiler burner for hot water heating in a main body.

  Conventionally, this type of heater is equipped with a stove burner made of a pot type burner for indoor heating and a boiler burner for hot water heating such as floor heating made of a pot type burner, and each burner is supplied from a fuel tank. Fuel is pumped up by an electromagnetic pump and supplied through an oil supply pipe, and combustion air is supplied by a combustion blower.

Then, in the stove burner for indoor heating, combustion is performed with the supplied fuel and combustion air, and the combustion gas is discharged from the top of the supply / exhaust top after passing through the radiator, and in the boiler burner for hot water heating, The combustion fuel is burned with the combustion air, and the burned combustion gas is heat exchanged with a heat medium for floor heating in a heat exchanger connected to a radiator for floor heating, and after passing through the heat exchanger, The air was discharged from the top of the air supply / exhaust top.
(For example, refer to Patent Document 1.)

Japanese Utility Model Publication No. 7-32314

  By the way, in this conventional one, since the supply / exhaust to the stove burner and the boiler burner is the same supply / exhaust route, the combustion air from the supply passage is branched and supplied to the stove burner and the boiler burner, and from the stove burner and the boiler burner Exhaust gas joins in the collective exhaust pipe and is exhausted to the outside, but the operation is a single operation of a stove burner for indoor heating, a single operation of a boiler burner for hot water heating, a stove burner for indoor heating, and a boiler burner for hot water heating The simultaneous operation can be selected and the operation can be performed.

  Therefore, when an independent operation of a stove burner for indoor heating or an independent operation of a boiler burner for hot water heating is performed, exhaust gas from the operating burner recirculates in the collecting exhaust pipe and flows into the stopped burner. Therefore, in the case of independent operation, the combustion fan on the burner side when operation is stopped is operated so that the internal pressures of both burners are the same.

  However, if the burner operation during single operation is set to the minimum heating power, the temperature of the exhaust gas decreases, but the cooler outside air joins the low-temperature exhaust gas from the burner side when the operation is stopped, so the temperature further decreases and the There was a problem that water vapor in the exhaust gas was condensed near the exhaust top or icing was generated near the supply / exhaust top.

  In addition, if the burner operation during single operation is set to maximum heating power, the temperature of the exhaust gas increases, but the amount of water vapor contained in the exhaust gas increases as the temperature increases, and the temperature of the exhaust gas decreases near the top of the supply and exhaust. There has been a problem that condensation of water vapor in the exhaust gas containing a large amount of water vapor occurs.

  In order to solve the above-mentioned problems, according to a first aspect of the present invention, a first burner for burning fuel, a second burner for similarly burning fuel, and a first for supplying combustion air to the first burner A second combustion blower and a second combustion blower for supplying combustion air to the second burner, one end connected to the supply / exhaust top, and the other end branched to provide a first combustion blower and a second combustion An air supply pipe connected to the blower for supplying the outside air flowing in from the supply / exhaust top to the first combustion blower and the second combustion blower, one end connected to the supply / exhaust top, and the other end to the first burner And an exhaust pipe that joins and connects the combustion gas from the second burner and collects the combustion gas from the first burner and the combustion gas from the second burner and exhausts them outdoors from the supply / exhaust top. The first burner and the second burner In simultaneous operation or combustion device that performs one of islanding by, when one of the isolated operation is to set the heating power of the burner side to drive the rotational speed of the burner side of the combustion air blower which is not operated.

  Moreover, in Claim 2, when the thermal power of the burner to operate | move is a strong thermal power in Claim 1, it is higher than the rotational speed of the burner side combustion air blower which drive | operates the rotational speed of the burner side combustion air blower which is not operated. When the heating power of the burner to be operated is medium heating power, the rotation speed of the combustion fan on the burner side that is not operated is set to the same rotation speed as the combustion fan on the burner side that is operated. When the thermal power of the burner is weak, the rotational speed of the burner-side combustion blower that is not operated is set to a lower rotational speed than the rotational speed of the burner-side combustion blower that operates.

  According to claim 1 of the present invention, in a combustion apparatus that performs simultaneous operation or one single operation by a first burner that burns fuel and a second burner that also burns fuel, the operation is performed when one single operation is performed. The speed of the combustion blower on the burner side that is not set is set by the heating power on the burner side that is operated, so that the combustion gas can be prevented from flowing into the burner that is not operated, and the exhaust temperature of the combustion gas is set to a suitable temperature with little occurrence of condensation. Thus, even when the temperature of the exhaust gas decreases near the top of the supply / exhaust top, the occurrence of dew condensation of water vapor in the exhaust gas can be reduced.

  Further, according to claim 2, when the heating power of the burner to be operated is a strong heating power, the rotation speed of the combustion fan on the burner side that is not operated is higher than the rotation speed of the combustion fan on the burner side that is operated. When the heating power of the burner that is set and operated is medium thermal power, the rotational speed of the combustion fan on the burner side that is not operated is set to the same rotational speed as the combustion fan on the burner side that is operated, and the thermal power of the burner that is operated Is set to a lower rotational speed than the rotational speed of the burner-side combustion blower that operates, so that the combustion gas flows into the non-operated burner. It is possible to prevent the occurrence of condensation of water vapor in the exhaust gas even when the temperature of the exhaust gas is low near the top of the supply / exhaust. With things That.

  Further, when the operating power of the burner to be operated is strong, the rotational speed of the combustion fan on the burner side that is not operated is set to be higher than the rotational speed of the combustion fan on the burner side that is operated, so that The amount of combustion air on the burner side of the burner is increased and mixed with the combustion gas to lower the temperature of the combustion gas.Therefore, the water vapor contained in the combustion gas is reduced and the temperature of the exhaust gas is lowered near the top of the supply and exhaust. However, it is possible to reduce the occurrence of condensation of water vapor in the exhaust gas, and for the burner side combustion that operates the rotational speed of the burner on the burner side that is not operated when the operating power of the burner is medium. By setting the rotation speed to the same as the rotation speed of the blower, the exhaust gas temperature becomes 100 ° C or higher and the condensation temperature is low, so the temperature of the exhaust gas decreases near the top of the supply and exhaust. The occurrence of condensation of water vapor in the exhaust gas can be reduced, and the burner side combustion blower that operates the rotational speed of the burner side combustion blower that is not operated when the heating power of the rotating burner is weak By setting the engine speed lower than the engine speed, it is possible to prevent the temperature of the combustion gas, which is low in temperature, from being greatly reduced due to low thermal power. Freezing is unlikely to occur near the top.

1 is a schematic view of a combustion control device according to an embodiment of the present invention. The flowchart figure of control of the blower for combustion.

Next, a combustion apparatus according to the present invention will be described with reference to an embodiment shown in the drawings.
1 is a boiler burner for hot water heating such as floor heating composed of a pot type burner, and includes a boiler ignition heater 2, a boiler nozzle 3 for supplying fuel oil, and a boiler frame rod 4 for detecting flame, Combustion air is supplied from the boiler combustion blower 5 to burn the fuel oil.

  A boiler heat exchanger 6 is provided at the upper part of the boiler burner 1 and includes a heat exchanger 7 for exchanging heat with the combustion gas rising from the lower boiler burner 1, and circulating fluid flowing in the heat exchanger 7 It is for heating.

  Reference numeral 8 denotes an expansion tank, in which the circulating fluid heated by passing through the heat exchanger 7 from the hot water return pipe 9 is stored, and the heated circulating liquid is supplied to the circulating pump 11 to which the hot water going pipe 10 is connected. Is.

  A stove burner 12 is a pot-type burner made of a pot type burner, and includes a stove ignition heater 13, a stove nozzle 14 for supplying fuel oil, and a stove frame rod 15 for detecting flames. Combustion air is supplied by the blower 16 and the fuel oil is burned.

  Reference numeral 17 denotes a stove heat dissipating portion provided at the upper portion of the stove burner 12, and a skeleton 19 that is heated by the combustion gas and heated red by the combustion gas is provided in the glass cylinder 18. 20 is provided.

  21 is a constant oil level device which stores a certain amount of kerosene supplied from the oil pipe 22, supplies kerosene to the nozzle 14 for the stove via the oil feed pipe 24 for the stove by the stove electromagnetic pump 23, and also serves as an electromagnetic pump for the boiler. 25, kerosene is supplied to the boiler nozzle 3 via the boiler oil feed pipe 26.

  An air supply pipe 27 has one end connected to a supply / exhaust top (not shown) and the other end branched to be connected to the boiler combustion blower 5 and the stove combustion blower 16. Is supplied to the combustion fan for boiler 5 and the combustion fan 16 for stove.

  An exhaust pipe 28 has one end connected to a supply / exhaust top (not shown) and the other end connected to the combustion gas that has passed through the boiler heat exchanging section 6 and the combustion gas that has passed through the radiator 20. The combustion gas that has passed through the boiler heat exchanging unit 6 and the combustion gas that has passed through the radiator 20 are collected and exhausted from the top of the supply / exhaust to the outside.

A convection blower 29 blows air outside the device into the device body.
A hot water temperature thermistor 30 detects the temperature of the circulating fluid that has been heated through the heat exchanger 7.

Next, the hot water heating operation by the boiler burner 1 will be described.
First, kerosene is supplied from the constant oil level device 21 to the boiler nozzle 3 via the boiler oil feed pipe 26 by the boiler electromagnetic pump 25, vaporized in the boiler burner 1, and ignited by the boiler ignition heater 2. Then, combustion air is supplied from the combustion fan 5 for the boiler and burns, and the flame is detected by the boiler frame rod 4 to continue the combustion.

The combustion gas is sent to the exhaust pipe 28 while exchanging heat with the circulating fluid in the heat exchanger 7 of the boiler heat exchanging section 6, and exhausted to the outside from the supply / exhaust top.
Further, the circulating fluid subjected to heat exchange is sent to the warm water discharge pipe 10 by the circulation pump 11 via the expansion tank 8.

At this time, the temperature of the circulating fluid subjected to heat exchange is detected by the hot water temperature thermistor 30, and the heating power of the boiler burner 1 is adjusted so that the detected temperature becomes a predetermined temperature.
Moreover, the hot water outlet temperature of the circulating fluid can be set in the range of 30 ° C to 70 ° C. When set to 30 ° C, the thermal power of the boiler burner 1 burns with low thermal power, and when set to 50 ° C, the thermal power of the boiler burner 1 is medium thermal power. When the temperature is set to 70 ° C., the boiler burner 1 burns with a strong heating power.

Next, the indoor heating operation by the stove burner 12 will be described.
First, kerosene is supplied from the constant oil level device 21 to the stove nozzle 14 via the stove feed pipe 24 by the stove electromagnetic pump 23, vaporized in the stove burner 12, and ignited by the stove ignition heater 13. Combustion air is supplied thereto by the stove combustion blower 16 to burn, and the flame is detected by the stove frame rod 15 to continue the combustion.

The combustion gas is sent to the exhaust pipe 28 while radiating heat from the glass cylinder 18 and the radiator 20 of the heat radiating portion 17 for the stove, and exhausted to the outside from the supply / exhaust top.
Further, the heating power of the stove burner 12 can be manually set to high, medium, and low heating power, and when automatic operation is set, the heating power is automatically adjusted so as to reach the room temperature set by the room temperature setting button.

  Next, the single operation of the hot water heating operation by the boiler burner 1 or the single operation of the indoor heating operation by the stove burner 12 will be described with reference to the flowchart of FIG.

  First, when the operation switch of the hot water heating operation or the indoor heating operation is turned on (S1), whether only one of the operation switches is turned on or the simultaneous operation in which both operation switches are turned on. In the case of simultaneous operation in which both operation switches are turned on (S2), the process proceeds to simultaneous operation control (S3). In the case of single operation in which only one operation switch is turned on, the next operation is performed. It is determined whether the burning power of the burner to be operated is strong (S4). In the case of strong heating power, the rotational speed of the combustion fan on the burner side that is not operated is set higher than the rotational speed of the combustion fan on the burner side that is operated. Make it work. (S5)

  As a result, the temperature of the combustion gas combusted by the strong thermal power becomes high, so that the water vapor contained in the combustion gas increases, but the rotational speed of the combustion blower on the burner side that is not operated is set to that of the combustion blower on the burner side that is operated. By operating at a higher rotational speed than the rotational speed, it is possible to completely prevent combustion gas from flowing into the burner that does not operate, and to burn more than the amount of combustion air on the burner side that operates low temperature outside air Since the temperature of the combustion gas is lowered by mixing with the gas, the amount of water vapor contained in the combustion gas is reduced, and even if the temperature of the exhaust gas is lowered near the top of the supply and exhaust, the occurrence of condensation of water vapor in the exhaust gas is reduced. Is something that can be done.

  If the burner operated in (S4) is not strong, it is determined whether the burner to be operated next is medium (S6), and if it is medium, the combustion blower on the burner side to be operated is determined. And the rotational speed of the combustion blower on the burner side that is not operated are set to the same rotational speed. (S7)

  This sufficiently prevents the combustion gas from flowing into the burner that does not operate, and lowers the temperature of the combustion gas by mixing low-temperature outside air with the same amount of combustion air as the combustion air on the burner side. Since the exhaust temperature of the combustion gas is 100 ° C. or higher and the condensation temperature is low, it is possible to reduce the occurrence of water vapor condensation in the exhaust gas even when the temperature of the exhaust gas decreases near the top of the supply / exhaust. Is.

  If the burner operated in (S6) is not medium heat, it is determined that the burner operated is weak, and the burner is not operated more than the rotational speed of the combustion blower on the burner side operated. Set the rotational speed of the combustion blower on the side to be low. (S8)

  This makes it difficult for the combustion gas to flow into the burner that does not operate, and prevents the temperature of the combustion gas having a low temperature from being greatly reduced by low heat power, thereby condensing water vapor in the exhaust gas near the top of the supply and exhaust. It is possible to make it difficult to cause icing or near the top of the air supply / exhaust.

  Then, after setting the rotational speed of the burner-side combustion blower that is not operated in (S5), (S7), and (S8), when the operation switch is turned off (S9), the operation is stopped (S10), and the operation is stopped. If the switch is not turned off, the process returns to (S2).

  When the heating power of the burner operated as described above is strong, the rotational speed of the combustion fan on the burner side that is not operated is set at a higher rotational speed than the rotational speed of the combustion fan on the burner side that is operated. When the thermal power of the burner to be operated is medium thermal power, the rotational speed of the combustion fan on the burner side that is not operated is set to the same rotational speed as the combustion fan on the burner side to be operated, and the burner is operated. When the thermal power of the burner is weak, the rotational speed of the combustion fan on the burner side that is not operated is set at a lower rotational speed than the rotational speed of the combustion fan on the burner side that is operated, so the combustion gas does not operate In addition to preventing inflow into the burner, even if the exhaust temperature of the combustion gas is at a suitable temperature with little condensation, even if the temperature of the exhaust gas decreases near the top of the supply / exhaust, condensation of water vapor in the exhaust gas occurs. Less It is those that can Rukoto.

  The rotational speed of the combustion blower on the burner side that is not operated is set uniformly according to the thermal power of the burner that is operated, but is not limited to this, and when the thermal power of the burner to be operated is high thermal power, A burner that operates at a rotational speed that is higher than the rotational speed of the combustion blower on the burner side that operates the rotational speed of the combustion blower, but does not operate to detect the exhaust gas temperature and bring it to a predetermined temperature. Set the rotation speed of the combustion blower on the side of the burner, or set the rotation speed of the combustion blower on the burner side that is not operated to be lower than the rotation speed of the combustion blower on the burner side that is operated when the heating power of the operating burner is low Although operating at a low rotational speed, the rotational speed of the combustion blower on the burner side that does not operate so that the temperature of the exhaust gas is detected and becomes a predetermined temperature may be set.

DESCRIPTION OF SYMBOLS 1 1st burner 5 1st combustion blower 12 2nd burner 16 2nd combustion blower 27 Supply pipe 28 Exhaust pipe

Claims (2)

  A first burner that burns fuel and a second burner that also burns fuel, a first combustion blower that supplies combustion air to the first burner, and a combustion air that is supplied to the second burner The second combustion blower, one end is connected to the supply / exhaust top, the other end is branched and connected to the first combustion blower and the second combustion blower, and the outside air flowing in from the supply / exhaust top is supplied to the first An air supply pipe to be supplied to the combustion blower and the second combustion blower, one end is connected to the supply / exhaust top, and the other end is connected to the combustion gas from the first burner and the second burner, An exhaust pipe that collects the combustion gas from the first burner and the combustion gas from the second burner and exhausts the combustion gas from the supply / exhaust top to the outside, and the simultaneous operation by the first burner and the second burner or For a combustion device that performs one single operation There are, one time of islanding, the combustion apparatus characterized by setting the heating power of the burner side to drive the rotational speed of the burner side of the combustion air blower which is not operated.   When the thermal power of the burner to be operated is strong, the rotational speed of the combustion fan on the burner side that is not operated is set higher than the rotational speed of the combustion fan on the burner side that is operated, and the thermal power of the burner to be operated is The burner that does not operate when the heating power of the burner on the burner side is set to the same rotational speed as the combustion fan on the burner side that operates. 2. The combustion apparatus according to claim 1, wherein the rotational speed of the combustion fan on the side is set to be lower than the rotational speed of the combustion fan on the burner side that operates.

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