JP4121440B2 - Combustion device, hot water supply / heating device, and cogeneration system - Google Patents

Description

The present invention comprises a burner in which a plurality of burner portions are arranged in parallel,
When the target combustion amount for the burner is within the high combustion amount range, the high burnup control is performed by adjusting the combustion amount of the burner within the high combustion amount range using the plurality of burner portions as combustion burner portions to which fuel is supplied. When the target combustion amount is within the low combustion amount range on the lower side of the high combustion amount range, the number of the combustion burner portions is decreased from that during the high combustion control to burn the burner. Combustion control means for performing combustion control by performing low combustion control for adjusting the amount within the low combustion amount range,
Combustion device configured to adjust the supply amount of combustion air to the burner so as to increase as the combustion amount per one combustion burner portion increases, and the combustion device is provided in a heat source unit The present invention relates to a hot water heater and a cogeneration system in which the combustion device is provided in an auxiliary heat source machine.

  This type of combustion apparatus includes a burner in which a plurality of burner portions are arranged side by side, and increases the number of combustion burner portions of the plurality of burner portions as the amount of combustion of the burner increases. The combustion amount can be adjusted, and furthermore, the combustion state in each combustion burner portion can be stabilized by appropriately setting the number of combustion burner portions according to the adjustment range of the combustion amount.

  That is, in the combustion control by the combustion control means, when the target combustion amount is within the high combustion amount range in which the plurality of burner portions should be the combustion burner portions, the plurality of burners are used as the combustion burner portions. If the target combustion amount is within a relatively low low combustion amount range while high combustion control is performed to adjust the combustion amount of the burner within the high combustion amount range, the number of combustion burner parts is increased. It is configured to adjust the combustion amount of the burner within the low combustion amount range by reducing the combustion amount compared to the time of combustion control.

  Further, in such a combustion apparatus, a combustion air fan that supplies combustion air to all the burner parts regardless of the number of combustion burner parts is provided, and combustion air based on the combustion amount and the number of combustion burner parts is provided. By controlling the rotational speed of the fan, the supply amount of combustion air from the combustion air fan to the burner is adjusted so as to increase as the combustion amount per combustion burner increases. ing.

That is, during the low combustion control, the combustion air supply amount increases as the combustion amount increases, and when the combustion amount falls within the high combustion amount range and is switched to the high combustion control, the combustion air supply amount is After once decreasing with a decrease in the combustion amount per combustion burner part, it is increased again with an increase in the combustion amount.
Therefore, in such a combustion apparatus, even when the low combustion control for adjusting the combustion amount within a relatively low low combustion amount range is executed, the combustion air supply amount may become extremely large. Noises such as noise, vibration of combustion air fans and wind noise may be a problem.

  Therefore, during low combustion control, when the combustion amount falls within the above-described range in which noise is to be suppressed, the combustion air supply amount, that is, the rotation of the combustion air fan is forcibly switched to high combustion control. A combustion apparatus configured to reduce the number and suppress noise has been proposed (see, for example, Patent Document 1).

  Further, in this combustion apparatus, the low combustion amount range that is the adjustment range of the combustion amount at the time of low combustion control partially overlaps the high combustion amount range that is the adjustment range of the combustion amount at the time of high combustion control. Set to state. In low combustion control, only when the target combustion amount is within the overlapped range, switching to high combustion control in order to suppress the above-described noise makes it possible to change the combustion amount before and after switching. Is preventing.

  Moreover, the combustion apparatus demonstrated until now may be utilized as combustion apparatuses, such as a heat source machine of a hot-water supply heater, and an auxiliary heat source machine of a cogeneration system.

That is, such a hot water supply and heating device supplies hot water heated by the heat source device by heat exchange with the combustion gas discharged from the combustion device and hot water heated by the heat source device in a state where the hot water temperature is set by mixing with the water supply. The hot water supply operation to be performed and the heating operation to heat the heating water circulating between the hot water heater and the hot water heated by the heat source device are configured to be executable.
In addition, the cogeneration system includes a thermoelectric power supply device that generates heat recovered as hot water together with electricity, and an auxiliary heat source device that heats water by heat exchange with the combustion gas discharged from the combustion device. Hot water is supplied by hot water generated by collecting heat generated by the co-feeding device, and when the hot water temperature is low, the auxiliary heat source unit is operated as appropriate to heat the hot water.

JP 2000-74368 A

  However, in the combustion apparatus described in Patent Document 1, when the range of the combustion amount that should suppress noise during the low combustion control is lower than the range where the low combustion amount range overlaps the high combustion amount range, Even if the combustion amount falls within the range where noise should be suppressed during low combustion control, that noise cannot be suppressed, and in addition, when switching to high temperature combustion control forcibly, a stable combustion state is ensured. In addition, the combustion amount must be increased to at least the lower limit of the high combustion amount range.

  The present invention has been made in view of the above problems, and its object is to suppress noise caused by an increase in the amount of combustion air supplied during low combustion control while suppressing fluctuations in the combustion amount to ensure stable combustion. The object is to provide a combustion apparatus that can be reliably suppressed, and further to provide a hot water supply and heating apparatus and a cogeneration system that can effectively use such a combustion apparatus.

In order to achieve the above object, a first characteristic configuration of a combustion apparatus according to the present invention includes a burner in which a plurality of burner portions are arranged in parallel,
When the target combustion amount for the burner is within the high combustion amount range, the high burnup control is performed by adjusting the combustion amount of the burner within the high combustion amount range using the plurality of burner portions as combustion burner portions to which fuel is supplied. When the target combustion amount is within the low combustion amount range on the lower side of the high combustion amount range, the number of the combustion burner portions is decreased from that during the high combustion control to burn the burner. Combustion control means for performing combustion control by performing low combustion control for adjusting the amount within the low combustion amount range,
A combustion apparatus configured to adjust a supply amount of combustion air to the burner so as to increase as a combustion amount per one of the combustion burner portions increases.
In a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range, the target combustion amount is not less than the upper limit value of the low combustion amount range and the high combustion amount range. If it is in the intermediate combustion amount range of less than the lower limit of the said low combustion control and the high combustion control by performing switching periodically, the average combustion amount of the burner in the intermediate combustion amount range The intermediate combustion control to be adjusted is executed.

  According to the first characteristic configuration of the combustion apparatus, even when the upper limit value of the low combustion amount range is set sufficiently lower than the range in which noise below the lower limit value of the high combustion amount range is to be suppressed, the target combustion amount is When the intermediate combustion amount range is equal to or higher than the upper limit value of the low combustion amount range and less than the lower limit value of the high combustion amount range, the intermediate combustion control is executed by the combustion control means. By suppressing the combustion amount per combustion burner part to be relatively small, noise due to an increase in the combustion air supply amount is reliably suppressed.

  Moreover, when the target combustion amount is within the intermediate combustion amount range, the intermediate combustion control is executed, so that the high combustion control is executed and the combustion amount is high enough to ensure stable combustion during the high combustion control. The lower limit value in the combustion amount range is set, and the low combustion control is executed and the combustion amount is set to the upper limit value in the low combustion amount range that can ensure stable combustion during the low combustion control. The average combustion amount per unit time is set to the target combustion amount within the intermediate combustion amount range between the low combustion amount range and the high combustion amount range while ensuring a stable combustion state. It becomes possible.

  According to a second characteristic configuration of the combustion apparatus according to the present invention, in addition to the first characteristic configuration of the combustion apparatus, the combustion control means sets the upper limit value of the low combustion amount range to be equal to or higher than the lower limit value of the high combustion amount range. In the set state, the normal operation mode in which the high combustion control and the low combustion control are executed, and the upper limit value of the low combustion amount range set to be less than the lower limit value of the high combustion amount range, The silent operation mode in which the high combustion control, the intermediate combustion control, and the low combustion control are executed can be switched.

  According to the second characteristic configuration of the combustion apparatus, the combustion control means is configured to be able to switch between the normal operation mode and the silent operation mode, so that a time zone in which noisy noise such as daytime is not a concern. For example, the normal operation mode is selected to stabilize the number of combustion burner parts, while the quiet operation mode is selected in a time zone where noise is a concern at night. Thus, it is possible to reliably suppress noise while ensuring stable combustion by suppressing fluctuations in the combustion amount.

The characteristic configuration of the hot water heater according to the present invention for achieving the above object includes a heat source device that heats water by heat exchange with the combustion gas discharged from the combustion device,
Heating water circulating between a hot water supply operation in which hot water heated by the heat source device is supplied by setting hot water temperature by mixing with hot water and heat exchange with the hot water heated by the heat source device A hot water supply and heating device configured to be capable of performing a heating operation for heating
The combustion apparatus includes the combustion apparatus according to claim 1 or 2,
The combustion control means of the combustion apparatus sets the target combustion amount within the intermediate combustion amount range during the hot water supply operation in a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range. This is in a point that the intermediate combustion control is not executed by prohibiting the control.

  According to the characteristic configuration of the hot water supply and heating apparatus, in the hot water supply and heating apparatus configured to be able to perform the hot water supply operation and the heating operation, as the combustion device of the heat source machine for heating the hot water, By adopting a combustion apparatus having two characteristic configurations, it is possible to reliably suppress noise due to an increase in the amount of combustion air supplied while suppressing fluctuations in the combustion amount of the combustion apparatus and ensuring stable combustion.

Further, during hot water supply operation, since hot water is mixed with hot water to obtain a set hot water temperature, the hot water temperature generated by the heat source device may be equal to or higher than the above set hot water temperature. The target combustion amount may be set under the condition that the hot water temperature discharged from the heat source machine is equal to or higher than the set hot water temperature.
Therefore, when the upper limit value of the low combustion amount range is set lower than the lower limit value of the high combustion amount range by the combustion control means of the combustion device, for example, in the silent operation mode, the upper limit value of the low combustion amount range is set to high combustion. By setting it below the lower limit of the amount range, noise during low combustion control is suppressed, and further, the target combustion amount is prohibited from being in the intermediate combustion amount range and the intermediate combustion control is not executed. Therefore, if the hot water temperature does not exceed the set hot water temperature even after the low combustion control is executed, the target combustion amount is set within the high combustion amount range beyond the intermediate combustion amount range, and the high combustion control is executed. By doing so, it is possible to stabilize the number of combustion burner portions without executing intermediate combustion control in which the number of combustion burners switches.

The characteristic configuration of the cogeneration system according to the present invention for achieving the above object includes a combined heat and power supply device that generates heat recovered as hot water together with electricity,
A cogeneration system comprising an auxiliary heat source device for heating water by heat exchange with combustion gas discharged from a combustion device,
The combustion apparatus includes the combustion apparatus according to claim 1 or 2,
In a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range, the combustion control means reduces the upper limit value of the low combustion amount range during operation of the cogeneration device. In that it is configured to adjust.

  According to the characteristic configuration of the cogeneration system, in the cogeneration system including the cogeneration device, in order to compensate for the lack of hot water with respect to the hot water generated by recovering the heat generated by the cogeneration device By adopting the combustion device having the above-described first and second characteristic configurations as a combustion device of the auxiliary heat source machine for heating water and generating hot water, the combustion amount of the combustion device is suppressed and stabilized. Noise due to an increase in the amount of combustion air supplied can be reliably suppressed while ensuring combustion.

  Further, when the combined heat and power supply device is operated, if the noise of the combustion device of the auxiliary heat source machine becomes large, the noise of the entire cogeneration system may become relatively large. Therefore, the combustion control means of the combustion device, for example, in the silent operation mode. As described above, when the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range, the upper limit value of the low combustion amount range is lowered during operation of the combined heat and power device, and noise during low combustion control is reduced. By making the state further suppressed, overall noise can be suppressed.

[Combustion device]
An embodiment of a combustion apparatus according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, this combustion apparatus burns a fuel such as city gas in a burner 3, performs heat exchange between the combustion gas and water flowing in the heat exchanger 12, and heats the water. It is used for the heat source machine 1 capable of generating hot water.

  Further, the burner 3 is provided with a plurality of burner portions 3a, 3b, 3c, and the fuel supply of each burner portion 3a, 3b, 3c is a plurality provided corresponding to each burner portion 3a, 3b, 3c. The on / off valve 4 can be switched intermittently, and the fuel supply amount to the burner 3, that is, the combustion amount of the burner 3 can be adjusted by the adjusting valve 5, and the fuel supply to the burner 3 can be shut off by the shutoff valve 6. Has been. The operation of the on-off valve 4, the regulating valve 5, and the shutoff valve 6 is configured to be controlled by a control unit 20 including a computer or the like as combustion control means for performing combustion control. 20 can adjust the open / close state of each on-off valve 4 to set the number of combustion burner portions that are supplied with fuel and are in a combustion state among the plurality of burner portions 3a, 3b, 3c, The amount of combustion of the burner 3 in which the number of combustion burner portions is set can be set by adjusting the opening of the adjusting valve 5.

  Further, the heat source unit 1 is provided with a combustion air fan 8 for supplying combustion air to the burner 3, and the operation of the combustion air fan 8 is controlled by the control unit 20. . Then, the control unit 20 sets the number of revolutions of the combustion air fan 8 to increase the combustion air supply amount to the burner 3 by increasing the combustion amount per combustion burner unit in the combustion state. It is configured to be set in a form that increases as the number of times increases.

  Furthermore, the control unit 20 can adjust the combustion amount in a wide range by increasing the number of combustion burner portions among the plurality of burner portions 3a, 3b, 3c as the combustion amount of the burner 3 is increased. it can.

  Specifically, in this embodiment, the burner 3 is provided with three burner portions 3a, 3b, 3c, and the control unit 20 also refers to FIG. 2 to replace one burner portion 3a with the combustion burner portion. The first combustion control that can adjust the combustion amount within the first combustion amount range (the range from the first lower limit value G1a to the first upper limit value G1b) on the smallest side, and the two burner portions 3a and 3b as combustion burners A second combustion control capable of adjusting the combustion amount within a second combustion amount range (a range from the second lower limit value G2a to the second upper limit value G2b) higher than the first combustion amount range, Using the burner portions 3a, 3b, 3c as combustion burner portions, the combustion amount is adjusted within a third combustion amount range (a range from the third lower limit value G3a to the third upper limit value G3b) higher than the second combustion amount range. Configuration that can be executed by selectively switching between possible third combustion control It has been.

When the target combustion amount for the burner 3 is within the first combustion amount range in a state where the normal operation mode described later is selected, the control unit 20 executes the first combustion control and executes one When the burner unit 3a is a combustion burner unit and the target combustion amount is in the second combustion amount range, the second combustion control is executed to set the two burner units 3a and 3b as combustion burner units, and the target combustion amount. Is in the third combustion amount range, the third combustion control is executed and the three burner portions 3a, 3b, 3c are used as combustion burners, so that the combustion amount is changed from the first lower limit value G1a to the third combustion amount. Adjustment can be made over a wide range up to the upper limit G3b.
The target combustion amount is a combustion amount of the burner 3 necessary for setting the temperature of the hot water discharged from the heat exchanger 12 to the target hot water temperature, and the target combustion amount is supplied to the heat exchanger 12. Using the temperature and flow rate of the water before heating, the amount of heat required to heat the water to the target hot water temperature (set hot water temperature) is obtained, or the actual temperature of the hot water discharged from the heat exchanger 12 is calculated. By using the flow rate, the amount of increase or decrease in the amount of heat necessary to set the actual temperature of the hot water to the target hot water temperature can be obtained in addition to the current combustion amount.
Further, a combustion amount that is increased or decreased by a predetermined amount with respect to the current combustion amount depending on whether the actual temperature of the hot water discharged from the heat exchanger 12 is higher or lower than the target hot water temperature is also set as the target combustion amount. I do not care.

  Further, the first combustion amount range and the second combustion amount range are set in a partially overlapping state by setting the first upper limit value G1b to be larger than the first lower limit value G2a. The second combustion amount range and the third combustion amount range are also set in a partially overlapping state by setting the second upper limit value G2b to be larger than the third lower limit value G3a. Occurrence of chattering in which the number changes frequently is prevented.

  In the heat source unit 1 configured as described above, in the normal operation mode of the control unit 20, the combustion air supply amount is increased to the maximum combustion air supply amount Amax as the combustion amount increases during each combustion control. Therefore, even when the first or second combustion control for adjusting the combustion amount within the relatively low first or second combustion amount range is executed, the combustion air supply amount becomes extremely large, and the wind at that time Noise, noise such as vibration of the combustion air fan 8 and wind noise may be a problem.

  Therefore, the control unit 20 has a silent operation mode that suppresses noise as described above, in addition to the normal operation mode, and can switch between the normal operation mode and the silent operation mode by an operation by the remote controller 21 or the like. It is configured.

  That is, in the state where the silent operation mode is selected, the control unit 20 also refers to FIG. 3 and sets the first upper limit value G1b to the second lower limit value when switching between the first combustion control and the second combustion control. When the target combustion amount is within the first intermediate combustion amount range (the range from the first upper limit value G1b ′ to the second lower limit value G2a) with the first upper limit value G1b ′ less than the value G2a being changed, For example, the first combustion control and the second combustion control are periodically switched and executed to execute the first intermediate combustion control for adjusting the average combustion amount of the burner 3 within the intermediate combustion amount range. Yes.

  As described above, in switching between the first combustion control and the second combustion control, the combustion amount of the burner 3 is adjusted within the second combustion amount range as the high combustion amount range in which the second combustion control is relatively high. It can be said to be high combustion control, and accordingly, the first combustion control adjusts the combustion amount of the burner 3 within the first combustion amount range as the low combustion amount range lower than the second combustion amount range. It can be called control.

Similarly, in the state where the silent operation mode is selected, the control unit 20 sets the second upper limit G2b to a second upper limit less than the third lower limit G3a when switching between the second combustion control and the third combustion control. When the target combustion amount is within the second intermediate combustion amount range (the range from the second upper limit value G2b ′ to the third lower limit value G3a) with the value changed to the value G2b ′, the second combustion control and the third combustion are performed. By switching between control and execution, the second intermediate combustion control for adjusting the average combustion amount of the burner 3 within the second intermediate combustion amount range is executed.
As described above, in switching between the second combustion control and the third combustion control, the combustion amount of the burner 3 is adjusted within the second combustion amount range as the high combustion amount range in which the third combustion control is relatively high. Low combustion in which the second combustion control adjusts the combustion amount of the burner 3 within the second combustion amount range as the low combustion amount range lower than the third combustion amount range. Control.

  As described above, the control unit 20 executes the first and second intermediate combustion controls in the silent operation mode, so that the combustion amount per combustion burner unit during the first or second combustion control can be reduced. By being suppressed to be relatively small, the combustion air supply amount is suppressed to, for example, a value As or less at which noise does not cause a problem. Therefore, noise due to the increase in the combustion air supply amount is reliably suppressed.

  In the intermediate combustion control, when the switching between the high combustion amount control and the low combustion amount control is performed periodically, the target combustion amount is the upper limit value (second lower limit value G2a or third lower limit value) of the intermediate combustion amount range. The closer to G3a), the average combustion amount of the burner 3 can be set to the target combustion amount within the second intermediate combustion amount range by increasing the time ratio for executing the high combustion amount control per unit time.

  Further, in the state where the silent operation mode is selected in this way, the third upper limit value G3b in the third combustion control is also changed to the third upper limit value G3b ′ at which the combustion air supply amount is equal to or less than the value As, and combustion is performed. By limiting the amount so as not to increase any more, noise during the third combustion control can be suppressed.

  Note that the control unit 20 may always perform the intermediate combustion control as in the silent operation mode without switching between the normal operation mode and the silent operation mode.

  Further, the control unit 20 is configured such that the silent operation mode is selected in a time zone such as nighttime set by the remote controller 21 or set in advance, and the normal operation mode is selected in other time zones. Can do.

[Hot water heater]
Next, an embodiment of the hot water supply and heating apparatus according to the present invention will be described with reference to FIG.
As shown in FIG. 4, this hot water supply and heating apparatus includes a heat source unit 1 having a configuration similar to that of the heat source unit described so far, and hot water heated by the heat source unit 1 is set by mixing with hot water. Thus, the hot water supply operation for supplying the hot water supply to the hot water tap 47 side and the heating operation for heating the heating water circulating between the hot water heater and the hot water heated by the heat source device 1 are configured to be executable. Yes.

  Further, the control unit 20 functions as a combustion control means having the above-described silent operation mode, and is configured to execute various operations such as the hot water supply operation and the heating operation by controlling the operations of various supplementary notes. .

  A hot water circulation circuit 35 for circulating hot water is provided with a hot water circulation pump 32 for circulating the hot water, a heat source unit 1, a temperature sensor 43 for detecting the temperature of hot water discharged from the heat source unit 1, and a heating water circulation circuit 50 described later. A heating heat exchanger 33 that heats the heating water circulating through the hot water by heat exchange and an on-off valve 34 that intermittently distributes the hot water to the heating heat exchanger 33 are arranged in order along the circulation direction of the hot water. The upstream side of the hot water circulation pump 32 is connected to the water supply passage 45 so that water is supplied.

In the hot water circulation circuit 35, a hot water supply path 44 leading to a hot water tap 47 and the like is connected to the downstream side of the heat source unit 1.
In the hot water supply path 44, there are a temperature sensor 41 for detecting the temperature of the hot water discharged from the heat source unit 1, a mixing valve 40 described later, a temperature sensor 42 for detecting the temperature of the hot water discharged from the mixing valve 40, and the like. It arrange | positions in order along a distribution direction, and the hot-water tap 47 is connected to the tip.

  The heating water circulation circuit 50 for circulating the heating water between the heating heat exchanger 33 and the hot water heater 53 side such as a bathroom heating dryer or a floor heater has a heating water circulation pump 48 for circulating the heating water. The heating heat exchanger 33, the hot water heater 53, the temperature sensor 49 that detects the temperature of the heating water returned from the hot water heater 53, and the like are sequentially arranged along the circulation direction of the heating water.

  The control part 20 can perform the hot water supply operation which supplies hot water to the hot-water tap 47 side, and adds description about the hot water supply operation.

When the hot-water tap 47 is opened, the control unit 20 performs a hot-water supply operation.
When the hot water supply operation is executed by the control unit 20, hot water heated by the heat source unit 1 is supplied to the mixing valve 40 of the hot water supply passage 44 by supplying hot water from the water supply passage 45 to the hot water circulation circuit 35. It is mixed with the low temperature water supplied from the water supply channel 45.
Further, the mixing valve 40 is controlled based on the temperature of the hot water detected by the temperature sensor 42, the mixing ratio of the hot water and the water supply is adjusted, and the hot water at the set hot water temperature set by the remote controller 21 is supplied to the hot water tap 47 side. To be supplied.

  Further, in this hot water supply operation, the control unit 20 increases the target combustion amount of the burner 3 in the heat source unit 1 when the temperature of the hot water detected by the temperature sensor 41 is equal to or lower than the set hot water temperature. When the temperature of the hot water detected by 41 is equal to or higher than the allowable hot water temperature set higher than the set hot water temperature, the target combustion amount of the burner 3 in the heat source unit 1 is reduced.

  When hot-water tap 47 is closed, the hot water flow is terminated by recognizing that the flow of hot water has stopped due to the flow rate of hot water detected by a flow sensor or the like.

  The control part 20 can perform the heating operation which circulates the hot water heated to the hot water heater 53 side, and adds description about the heating operation.

When the operation switch of the hot water heater 53 is turned ON in the remote controller 21, the control unit 20 performs the heating operation.
When the heating operation is executed by the control unit 20, the heating water circulation pump 48 is operated in the heating water circulation circuit 50, and the heating water is circulated between the heating heat exchanger 33 and the hot water heater 53.

  In this heating operation, when the temperature of the heating water detected by the temperature sensor 49 is equal to or lower than the set temperature, heating of the heating water by the heating heat exchanger 33 is started.

  When heating of the heating water by the heating heat exchanger 33 is started, the hot water circulation pump 32 and the heat source unit 1 are operated in the hot water circulation circuit 35 with the on-off valve 34 being opened, and the heat source unit 1 is operated. The hot hot water heated at is circulated between the heating heat exchanger 33 and the heating water is heated to a relatively high temperature.

  Further, in this heating operation, the control unit 20 adjusts the target combustion amount of the burner 3 in the heat source unit 1 so that the temperature of the hot water in the hot water circulation circuit 35 detected by the temperature sensor 43 becomes a constant set temperature. The

  The controller 20 of the hot water heater is configured so as to have a silent operation mode, as described above, and in the state where the silent operation mode is selected, during the hot water supply operation as described above. The target combustion amount is prohibited from being within the first and second intermediate combustion amount ranges, and the first and second intermediate combustion controls are not executed.

That is, during the hot water supply operation, the hot water temperature generated by the heat source unit 1 and supplied to the mixing valve 40 is different from that in the heating operation in order to mix the low temperature water supply with the hot water at the mixing valve 40 to obtain the set hot water temperature. A rough one above the set hot water temperature may be used.
Therefore, the control unit 20 adjusts the target combustion amount of the burner 3 in the heat source unit 1 so that the hot water temperature detected by the temperature sensor 41 is at least equal to or higher than the set hot water temperature during the hot water supply operation in the silent operation mode. In addition, the first and second intermediate combustion controls which prohibit the first and second intermediate combustion amount ranges and switch the number of combustion burner portions are not performed, noise is suppressed, and the combustion burner portion The first and second combustion controls that keep the number constant, and further the third combustion control are selectively switched and executed.

  Furthermore, when the control unit 20 selectively switches between the first combustion control, the second combustion control, and the third combustion control, the control unit 20 is configured to prohibit switching for a certain period from the time of switching. Occurrence of chattering in which the number of combustion burner portions is frequently changed can be prevented.

[Cogeneration system]
Next, an embodiment of a cogeneration system according to the present invention will be described with reference to FIG.
This cogeneration system has the same configuration as that of the above-described hot water supply and heating device. The common configuration is denoted by the same reference numeral in the drawings, and a description will be given focusing on different configurations.

  As shown in FIG. 5, this cogeneration system is similar to the heat source cogeneration device 25 such as an engine-driven generator or a fuel cell that generates heat recovered as hot water together with electricity, and the heat source apparatus described so far. The auxiliary heat source unit 1 is configured.

The hot water circulation circuit 35 is connected to a hot water storage tank 31 for storing hot water in parallel with the heating heat exchanger 33 and the on-off valve 34, and further collects heat generated in the combined heat and power supply device 1 and stores the hot water by the heat. An exhaust heat recovery heat exchanger 26 that heats the hot water stored in the tank 31 is provided on the downstream side of the hot water circulation pump 32.
The hot water supply path 45 is connected to the lower part of the hot water storage tank 31.

  The control unit 20 of the cogeneration system functions as a combustion control unit having the above-described silent operation mode, and the operation of various auxiliary machines is controlled by the control unit 20 and is the same as that of the above-described hot water heater / heater. In addition to the above hot water supply operation and heating operation, various operations such as an exhaust heat hot water storage operation in which hot water is stored in a state where temperature stratification is formed in the hot water storage tank 31 are executed.

  A cooling water circulation circuit 28 that circulates the cooling water between the combined heat and power supply device 1 and the exhaust heat recovery heat exchanger 26 cools the hot water circulating through the cooling water circulation pump 27 and the hot water circulation circuit 35 for circulating the cooling water. An exhaust heat recovery heat exchanger 26 and the like that are heated by heat exchange with water are sequentially arranged along the circulation direction of the cooling water.

  The control unit 20 can execute an exhaust heat hot water storage operation in which hot water is stored in a state where temperature stratification is formed in the hot water storage tank 31, and the exhaust heat hot water storage operation will be described.

  When the exhaust heat hot water storage operation is executed by the control unit 20, the cooling water circulation pump 27 is operated in the cooling water circulation circuit 28, and the cooling water is circulated between the combined heat and power supply device 1 and the exhaust heat recovery heat exchanger 26. The

  On the other hand, in the hot water circulation circuit 35, the hot water circulation pump 32 is operated, and hot water taken out from the lower part of the hot water storage tank 31 is circulated to the upper part of the hot water storage tank 31 through the exhaust heat recovery heat exchanger 26. Is opened, and a part of the hot water discharged from the exhaust heat recovery heat exchanger 26 is circulated through the heating heat exchanger 33 side.

  Therefore, in the exhaust heat recovery heat exchanger 26, hot water taken out from the lower part of the hot water storage tank 31 and circulating in the hot water circulation circuit 35 is heated by receiving heat from the cooling water circulating in the cooling water circulation circuit 28, and is about 70 ° C. It becomes hot water. The hot water is stored in the upper part of the hot water storage tank 31, and in the hot water storage tank 31, the hot water is stored in the upper part and the low temperature water is stored in the lower part. Will be saved.

  In addition, in the hot water circulation circuit 35, in order to store hot water of a target temperature in the hot water storage tank 31, a flow rate adjustment valve 36 provided at the upper part of the hot water storage tank 31 is controlled based on the hot water temperature detected by the temperature sensor 43. The flow rate of hot water supplied to the upper part of the hot water storage tank 31 is adjusted to an appropriate flow rate.

  When the hot water supply operation is executed by the control unit 20, the hot water stored in the upper part of the hot water storage tank 31 is supplied from the hot water supply path 45 to the lower part of the hot water storage tank 31. Is supplied to the mixing valve 40 and mixed with the low-temperature water supplied from the water supply channel 45, and hot water with the set hot water temperature is supplied to the hot water tap 47 side.

  When the heating operation is executed by the control unit 20, the heating water circulation pump 48 is operated in the heating water circulation circuit 50, and the heating water is circulated between the heating heat exchanger 33 and the hot water heater 53, thereby heating the heat exchanger. When heating of the heating water by 33 is started, in the hot water circulation circuit 35, the flow rate adjustment valve 36 is closed and the open / close valve 34 is opened, and the hot water circulation pump 32 and the auxiliary heat source machine are opened. 1 is operated, the hot hot water heated by the heat source unit 1 is circulated with the heating heat exchanger 33, and the heating water is heated to a relatively high temperature.

  The controller 20 of the hot water heater is configured so as to have a silent operation mode as described above, and further, in the state where the silent operation mode is selected, the above-described exhaust heat storage hot water. During operation of the combined heat and power device 25 in operation, the first upper limit G1b ′, which is the combustion amount when switching between the first combustion control and the first intermediate control, and the combustion when switching between the second combustion control and the third intermediate control The second upper limit value G2b ′, which is the amount, is adjusted so as to be lower than the value when the cogeneration apparatus 25 is not in operation.

That is, when the auxiliary heat source unit 1 is also operated when the combined heat and power supply device 25 is operated, if the noise on the auxiliary heat source unit 1 side increases, the noise of the entire cogeneration system may become relatively large.
Therefore, in the silent operation mode, the control unit 20 sets the first upper limit value G1b ′ and the second upper limit value G2b ′ to values considering only the noise of the auxiliary heat source unit 1 when the cogeneration device 25 is not operating. On the other hand, when the cogeneration device 25 is operated, the first upper limit value G1b ′ and the second upper limit value G2b ′ are more constant than the non-operating values of the cogeneration device 25 in consideration of the noise of the cogeneration device 25. The noise of the entire cogeneration system can be suppressed by setting the value to a reduced value and setting the noise to be further suppressed in the first and second combustion controls.

  Further, in the silent operation mode, the control unit 20 is not only the first upper limit value G1b ′ and the second upper limit value G2b ′ but also the first value of the combustion amount in the third combustion control when the cogeneration device 25 is operated. The 3 upper limit value G3b ′ can also be reduced from the value when the combined heat and power supply device 25 is not operating, thereby suppressing noise during the third combustion control.

[Another embodiment]
(1) In the above embodiment, the burner 3 is constituted by the three burner portions 3a, 3b, 3c, but the number of burner portions can be changed as appropriate. In the above embodiment, the number of burner parts to be burned is changed one by one in each combustion control. Separately, the number of burner parts to be changed can be changed as appropriate. is there.

(2) In the above embodiment, the combustion apparatus according to the present invention is applied for heating the heat exchanger 12 in the heat source unit 1. However, the application of the combustion apparatus is not limited to the heat source unit 1. .

Schematic configuration diagram of a heat source machine employing a combustion device A graph showing the relationship between the combustion amount and the combustion air supply amount in the normal operation mode A graph showing the relationship between the combustion amount and the combustion air supply amount in the silent operation mode Schematic configuration diagram of hot water heater Schematic configuration diagram of cogeneration system

Explanation of symbols

1: (auxiliary) heat source unit 3: burners 3a, 3b, 3c: burner unit 4: on-off valve 5: regulating valve 8: combustion air fan 12: heat exchanger 20: control unit 25: combined heat and power supply device 35: hot water circulation Circuit 40: Mixing valve 47: Hot water tap 50: Heating water circulation circuit 53: Hot water heater

Claims (4)

A burner having a plurality of burner portions arranged in parallel;
When the target combustion amount for the burner is within the high combustion amount range, the high burnup control is performed by adjusting the combustion amount of the burner within the high combustion amount range using the plurality of burner portions as combustion burner portions to which fuel is supplied. When the target combustion amount is within the low combustion amount range on the lower side of the high combustion amount range, the number of the combustion burner portions is decreased from that during the high combustion control to burn the burner. Combustion control means for performing combustion control by performing low combustion control for adjusting the amount within the low combustion amount range,
A combustion apparatus configured to adjust a supply amount of combustion air to the burner so as to increase as a combustion amount per one of the combustion burner portions increases.
In a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range, the target combustion amount is not less than the upper limit value of the low combustion amount range and the high combustion amount range. When the intermediate combustion amount range is less than the lower limit value, the high combustion control and the low combustion control are periodically switched to execute the average combustion amount of the burner within the intermediate combustion amount range. A combustion apparatus that performs intermediate combustion control to be adjusted.   A normal operation mode in which the combustion control means is configured to execute the high combustion control and the low combustion control in a state where the upper limit value of the low combustion amount range is set to be equal to or higher than the lower limit value of the high combustion amount range; A silent operation mode in which the high combustion control, the intermediate combustion control, and the low combustion control are executed in a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range; The combustion apparatus according to claim 1, which is configured to be switchable. It has a heat source machine that heats water by heat exchange with the combustion gas discharged from the combustion device,
Heating water circulating between a hot water supply operation in which hot water heated by the heat source device is supplied by setting hot water temperature by mixing with hot water and heat exchange with the hot water heated by the heat source device A hot water supply and heating device configured to be capable of performing a heating operation for heating
The combustion apparatus includes the combustion apparatus according to claim 1 or 2,
The combustion control means of the combustion apparatus sets the target combustion amount within the intermediate combustion amount range during the hot water supply operation in a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range. A hot water supply / room heating device configured to prohibit the operation and prevent the intermediate combustion control from being executed. Together with electricity, a combined heat and power device that generates heat recovered as hot water,
A cogeneration system comprising an auxiliary heat source device for heating water by heat exchange with combustion gas discharged from a combustion device,
The combustion apparatus includes the combustion apparatus according to claim 1 or 2,
In a state where the upper limit value of the low combustion amount range is set to be less than the lower limit value of the high combustion amount range, the combustion control means reduces the upper limit value of the low combustion amount range during operation of the cogeneration device. A cogeneration system that is configured to coordinate.

Images