JP4106846B2 - Combined combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combined combustion apparatus of a type that discharges exhaust from two sets of combustors from a common exhaust collecting cylinder.
[Prior art]
Conventionally, two sets of combustors such as a hot water supply combustor and a bath combustor are incorporated in a common casing, and the combustion exhaust of the two sets of combustors is discharged from a common exhaust collection cylinder. Combined combustion devices are in practical use.
The conventional combustor usually has a hot water temperature, a hot water supply amount, a fuel gas flow rate, etc. based on a command from the remote controller, a hot water temperature, a CO concentration in exhaust gas, a fan rotation speed, a fan motor drive current, and the like. It controls the drive current and rotation speed of the fan motor.
[0002]
Here, since the blower amount of the fan of the combustor is proportional to the drive current and the rotation speed of the fan motor, the blower amount of the fan is controlled by controlling the drive current and the rotation number of the fan motor. Even if the combustion conditions of the combustor are constant, if the exhaust resistance increases due to the influence of external winds, etc., the fan's airflow will decrease, so in recent combustors, the fan's airflow is adjusted according to the exhaust resistance. It has a function to correct (called fan-up).
[0003]
Japanese Patent Application Laid-Open No. 6-129635 proposes a control device for a combined combustion apparatus, in which the two sets of combustors are controlled by two sets of control units, respectively. When the burner of one of the combustors is activated, the operation permission signal and the set rotational speed signal are output to the counterpart control unit, and the other combustor Forcibly rotate the fan at the same speed. Moreover, when the burner of the other combustor operates, both control units control each combustor independently.
[0004]
Japanese Patent Laid-Open No. 6-2836 proposes a combined combustion apparatus. In this combined combustion apparatus, the rotational speed of the fan of the first combustor having a large combustion capacity and variable combustion amount is proportional to the combustion amount, and the second The rotational speed of the fan of the combustor is proportional to the amount of combustion and the rotational speed of the fan of the first combustor.
[0005]
[Problems to be solved by the invention]
The combined combustion apparatus of the type that discharges the exhaust of the two sets of combustors from a common exhaust collecting cylinder is equipped with a function of correcting the fan air flow according to the exhaust resistance, and both combustion When operating the machine simultaneously, there are the following problems. If for some reason one of the first combustors is fan-up, the exhaust flow rate in the exhaust manifold increases, and the exhaust resistance to the exhaust of the other second combustor increases due to exhaust interference, resulting in an increase in the blown amount of the fan. In order to decrease, the second combustor also performs fan-up in an attempt to restore the fan's blast volume. Under the influence, the first combustor performs the fan-up again as described above. Thus, there is a problem that a series of fan-ups are repeated many times alternately in a chain.
[0006]
In the control device of the former publication, when both combustors are operating, the fan motors of the respective combustors are independently controlled by the two control units. Cannot be effectively prevented.
In the composite combustion apparatus of the latter publication, when the first combustor performs a fan-up when the combustion amount of the first combustor is relatively small and the combustion amount of the second combustor is large. The fan speed of the second combustor also increases, and as a result, the first combustor may repeat the fan-up again, and the above problem still remains.
[0007]
[Means for Solving the Problems]
The combined combustion apparatus according to claim 1 is configured so that the exhaust gas of the two sets of combustors is discharged from a common exhaust collecting cylinder. After detecting the shortage of the fan and increasing the airflow, if the shortage of the other fan is detected and the increase of the airflow is corrected within the set time, the count that counts the number of executions of the airflow correction Correction prohibiting means is provided for prohibiting fan air flow correction for a predetermined time when the number exceeds a predetermined number of times.
[0008]
The combustion exhaust of the two sets of combustors is exhausted from a common exhaust collecting cylinder, so that the exhaust of each combustor may interfere with the exhaust of the other combustor and become difficult to exhaust. In such a case, the air flow rate is corrected to increase, and the air flow rate of the counterpart combustor is increased and corrected in conjunction with the correction of the air flow rate. When a series of increase corrections of the air flow rate due to this type of exhaust interference occurs, the correction prohibiting means performs the fan air flow rate correction to a predetermined value when the count number obtained by counting the number of air flow correction executions is equal to or greater than a predetermined number. Prohibit time. In this way, since the chain of increase correction of the blast volume can be stopped, the exhaust and combustion in both the combustors can be stabilized and the driving power of the motor can be saved.
[0009]
The combined combustion apparatus according to claim 2 is configured so that the exhaust of two sets of combustors is discharged from a common exhaust collecting cylinder. After detecting the shortage of the fan and increasing the airflow, if the shortage of the other fan is detected and the increase of the airflow is corrected within the set time, the count that counts the number of executions of the airflow correction A correction limiting means is provided for returning the correction value of the air flow correction of the fan to the initial value when the number exceeds a predetermined number. Note that returning the correction value of the fan air flow correction to the initial value includes returning the correction value to zero.
[0010]
As in the first aspect, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, when the correction limiting means counts the number of executions of the air flow rate correction to a predetermined number or more, the air flow rate of the fan Return the correction value to the initial value. Therefore, as in the first aspect, the chain of increase correction of the blown air amount can be stopped, so that the exhaust and combustion in both the combustors can be stabilized and the driving power of the motor can be saved.
[0011]
The combined combustion apparatus according to claim 3 is configured so that the exhaust of the two sets of combustors is discharged from a common exhaust collecting cylinder. When the shortage of the fan is detected and the airflow is increased and corrected, the shortage of the other fan is detected and the airflow is increased and corrected within the set time. A correction prohibiting means is provided for prohibiting the fan air flow correction for a predetermined time when the correction amount exceeds a predetermined value.
[0012]
As in the first aspect, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, the correction prohibiting means sends the fan when the integrated correction amount obtained by integrating the correction values of the air flow rate correction exceeds a predetermined amount. Airflow correction is prohibited for a predetermined time. Therefore, as in the first aspect, the chain of increase correction of the blown air amount can be stopped, so that the exhaust and combustion in both the combustors can be stabilized and the driving power of the motor can be saved.
[0013]
The combined combustion apparatus according to claim 4 is configured so that the exhaust of the two sets of combustors is discharged from a common exhaust collecting cylinder. When the shortage of the fan is detected and the airflow is increased and corrected, the shortage of the other fan is detected and the airflow is increased and corrected within the set time. When the correction amount is equal to or greater than a predetermined value, there is provided a correction limiting means for returning the correction value of the fan air flow correction value to the initial value. Note that returning the correction value of the fan air flow correction to the initial value includes returning the correction value to zero.
[0014]
In the same manner as in claim 1, when a series of increase corrections of the air flow rate due to exhaust interference occurs, the correction restricting means adds the correction value of the air flow rate correction and the integrated correction amount exceeds a predetermined amount. Return the correction value for air flow correction to the initial value. Therefore, as in the first aspect, the chain of increase correction of the blown air amount can be stopped, so that the exhaust and combustion in both the combustors can be stabilized and the driving power of the motor can be saved.
[0015]
The combined combustion apparatus according to claim 5 is configured so that the exhaust of the two sets of combustors is discharged from a common exhaust collecting cylinder. When the shortage of the air flow of the fan is detected and the air flow rate is increased and corrected, the shortage of the air flow rate of the other fan is detected and the air flow rate is increased and corrected within the set time. A correction limiting means is provided for setting so as to gradually decrease with respect to the regular correction amount.
[0016]
As in the case of claim 1, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, the correction limiting means decreases the correction value of the subsequent air flow rate correction every time correction is performed with respect to the normal correction amount. Set to go. Therefore, as in the first aspect, the chain of increase correction of the blown air amount can be stopped, so that the exhaust and combustion in both the combustors can be stabilized and the driving power of the motor can be saved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the combined combustion apparatus 1 includes a first combustor 2A that is a hot water heater, for example, a second combustor 2B that supplies hot water to a bath, a control unit 3, and the like. The second combustor 2 </ b> B is housed in a common casing and is configured to discharge combustion exhaust from a common exhaust collecting cylinder 4. The combined combustion apparatus 1 has a function of increasing and correcting the air flow rate of the fans 6a and 6b in accordance with the exhaust resistance of the combustors 2A and 2B.
[0018]
The first combustor 2A includes a burner 4a, a heat exchanger 5a thereabove, a gas proportional valve VG1 that controls the flow rate of gas supplied to the burner 4a, and a water adjustment valve that controls the flow rate of water supplied to the heat exchanger 5a. VW1, fan 6a that supplies air to burner 4a, motor M1 that drives fan 6a, and the like are included. Similarly, the second combustor 2B controls the flow rate of water supplied to the burner 4b, the heat exchanger 5b above it, the gas proportional valve VG2 that controls the flow rate of gas supplied to the burner 4b, and the heat exchanger 5b. A water adjustment valve VW2, a fan 6b for supplying air to the burner 4b, and a motor M2 for driving the fan 6b are provided.
[0019]
Next, the control unit 3 will be described with reference to FIG. The control unit 3 includes a microcomputer 10, a timer circuit 11, an input / output interface 12, a drive circuit 13a for the water regulating valve VW1, a drive circuit 14a for the gas proportional valve VG1, and a drive circuit 13b for the water regulating valve VW2. , A drive circuit 14b for the gas proportional valve VG2, a drive control unit 15a for the fan drive motor M1, a drive control unit 15b for the fan drive motor M2, and the like.
[0020]
Remote controllers 16a and 16b for the first and second combustors 2A and 2B are connected to an input / output interface 12, and other sensors (not shown) such as a burner sensor, a CO sensor, and a hot water temperature sensor are also input / output interfaces. 12 is connected. The microcomputer 10 includes a CPU 17, a ROM 18, and a RAM 19, and the ROM 18 has a control program (control program for air volume correction control described later) for controlling each device to be controlled by the first and second combustors 2 </ b> A and 2 </ b> B. And maps and tables related to those controls are stored in advance.
[0021]
As the table, for each of the first and second combustors 2A and 2B, the correlation between the combustion amount (cass flow rate), the motor drive current that drives the motors M1 and M2, and the motor rotation speed (fan rotation speed). Is stored. The combustion amount in each of the combustors 2A and 2B is determined by calculation with a predetermined combustion amount setting program based on the commands from the remote controllers 16a and 16b, the detected hot water temperature, the amount of water supply, and the like. The RAM 19 is provided with various memories and buffers for the above control. The timer circuit 11 receives the clock signal from the CPU 17 and counts the time.
[0022]
The drive control unit 15a is a motor driver 20a that supplies a controlled direct current to the motor M1 that is a brushless motor, a control signal received from the microcomputer 10 and a synchronization signal from the rotation logic 22a. PWM circuit 21a that controls the motor, rotation logic 22a that receives a detection signal of Hall IC 24a including a Hall element provided in motor M1 and generates a synchronization signal synchronized with the rotation of the motor, and rotation from the synchronization signal received from this rotation logic 22a A rotation speed pulse generation circuit 23 a that generates several pulses and outputs the same to the microcomputer 10 via the input / output interface 12 is provided.
[0023]
Similarly, the drive detection unit 15b includes a motor driver 20b that supplies a controlled direct current to the motor M2, which is a brushless motor, a PWM circuit 21b, a rotation logic 22b that receives a detection signal from the Hall IC 24b, a rotation speed pulse generation circuit 23b, and the like. Have Current transformers 25 a and 25 b for detecting the drive currents of the motors M 1 and M 2 are provided, and detection signals from these current transformers 25 a and 25 b are input to the microcomputer 10 via the input / output interface 12.
[0024]
Next, a schematic flowchart of a main routine of control executed by the microcomputer 10 of the control unit 3 when the first and second combustors 2A and 2B are simultaneously operated will be described. However, in the following flowcharts, the symbol Si (i = 1.2,...) Indicates each step. As shown in FIG. 3, when simultaneous operation of the first and second combustors 2A and 2B is started (S1), various command signals from the remote controllers 16a and 16b, detection signals from the current transformers 25a and 25b, Various signals such as detection signals from other sensors are read (S2).
[0025]
Next, drive control for the gas proportional valves VG1, VG2 is executed (S3), drive control for the water regulating valves VW1, VW2 is executed (S4), and then current control for controlling the drive currents of the motors M1, M2 is performed. The control signals are output to the PWM circuits 21a and 21b, respectively (S5). Thereafter, the process returns to S2, and S2 to S5 are repeatedly executed every minute time. Note that this control ends when the simultaneous operation of the first and second combustors 2A, 2B ends. The control of the motor drive current in S5 is to obtain the target motor drive current by applying the current required combustion amount and the detected motor rotation speed (fan rotation speed) to the above-mentioned air flow table, and use it as the drive current. This is done by outputting a control signal to be controlled to the PWM circuits 21a and 21b.
[0026]
Next, for the main routine of FIG. 3, for example, a description will be given of air flow control executed by interruption processing every predetermined minute time. As shown in FIG. 4, it is determined whether or not the combustion amounts of the first and second combustors 2A and 2B are steady (S10). If No, the flags F1 and F2 are reset in S11 and the process returns. When the gas supply amount to the second combustors 2A and 2B is constant and the combustion amount is steady for both combustors, it is determined whether or not the air flow rate of the first and second combustors 2A and 2B has decreased. (S12). By applying the motor rotational speed detected from the rotational speed pulse and the motor drive current detected by the current transformers 25a and 25b to the above-mentioned airflow table, it is possible to know the reduction and reduction ratio of the airflow.
[0027]
If the determination in S12 is No, the process returns as it is. However, if the determination in S12 is Yes, it is determined whether or not the flag F1 = 1 and the flag F2 = 1 (S13).
At first, since the flags F1 and F2 are not set, and both F1 and F2 are 0, the process proceeds from S13 to S14, and in S14, it is determined whether or not the air flow rate of the first combustor 2A has decreased. When the determination is Yes, the air flow rate of the first combustor 2A is increased and corrected (S15). In this case, the fan 6a of the first combustor 2A is sent with a correction value (for example, the correction value obtained in this way is a normal correction amount) of a reduction ratio (for example, A%) of the ventilation quantity with respect to the current set ventilation quantity. The air volume is corrected. The correction value is corrected by calculating an increase correction amount of the drive current of the motor M1 based on the air flow rate reduction ratio and the air flow rate table, and correcting the drive current.
[0028]
Next, in S16, the current time T1 when the current air flow correction is performed is input from the timer circuit 11 and stored in the memory, so that the time T1 is stored, and then the air flow of the fan of the first combustor 2A is stored. A flag F1 indicating that the correction has been executed is set (S17), and then the process returns to the main routine. On the other hand, when the air flow rate of the second combustor 2B is decreased, the determination in S14 is No, so that the air flow rate of the second combustor 2B is corrected to be increased in S18 as described above. At this time, the air flow rate is corrected with the correction value of the reduction rate (for example, B%) of the air flow rate. Next, the time T2 at which the air flow correction is performed is stored (S19), and then a flag F2 indicating that the air flow correction of the fan of the second combustor 2B has been executed is set (S20), and then the main routine is entered. Return.
[0029]
Next, when correction of the air flow rate of the fans 6a and 6b is executed for the first and second combustors 2A and 2A, the determination in S13 is Yes, and the process proceeds from S13 to S21 in FIG. As shown in FIG. 5, it is determined whether or not the time T1 is ahead of the time T2 in S21. If the time T1 is ahead, in S22, α minutes (for example, a set time) from the time T1 to the time T2 are determined. It is determined whether or not α = 1). If the determination is No, the process returns after resetting the flag F1 in S23.
[0030]
When the determination in S22 is Yes, the counter P that integrates the correction value of the air flow rate is set to P = A + B (%) in S24, and then P ≧ P0% (for example, the predetermined value P0 = 10) in S25. If the determination is No, the process returns after resetting the flag F1 in S23. When the determination in S25 is Yes, it is determined in S30 that the air flow correction is excessively repeated, and the subsequent air flow correction is limited by any of the following various modes.
[0031]
That is, in the first mode, the correction value of the air flow rate of the first and second combustors 2A and 2B is returned to the initial value (the correction amount = 0 state), and the initial value for a predetermined time (for example, 5 minutes). To maintain. The initial value does not necessarily have to be in the state of correction amount = 0, and an appropriate initial value may be applied. In the second aspect, the correction of the air flow rate is prohibited for a predetermined time (for example, 5 minutes). In a 3rd aspect, it sets so that the correction value of subsequent airflow correction | amendment may be gradually reduced by the predetermined | prescribed ratio for every correction | amendment with respect to the normal correction amount calculated | required based on the reduction | decrease ratio of airflow. For example, among the subsequent airflow corrections, the correction value for the first airflow correction is 1/2 of the normal correction amount, and the correction value for the second airflow correction is 1 / the normal correction amount. 4. The correction value for the third air flow amount correction is 1/8 of the normal correction amount.
[0032]
That is, the air flow rate of the first combustor 2A is increased and corrected, and the air flow rate of the second combustor 2B is increased and corrected in advance, and the integrated correction amount is a predetermined value (in this example, with respect to the normal set air flow rate). 10%) or more, the correction of the air flow rate of the first and second combustors 2A and 2B is limited in any of the above-described manners. In other cases, the flag F1 is reset in S23. And return. Next, in S31, the flags F1 and F2 are reset, the counters P and Q are reset, and then the process returns.
[0033]
On the other hand, if the time T2 precedes the time T1, the determination in S21 is No and the process proceeds to S26. In S26, as in S22, it is determined whether it is within α minutes from time T2 to time T1, and if the determination is No, the process returns after resetting the flag F2 in S27. When the determination in S26 is Yes, the counter Q for integrating the correction value of the air flow rate is set to Q = A + B (%) in S28, and then Q ≧ P0% (for example, the predetermined value P0 = 10) in S29. If the determination is No, the process returns after resetting the flag F2 in S27. When the determination in S29 is Yes, the process proceeds to S30 and is executed in the same manner as described above in S30, and then returns via S31.
[0034]
As described above, due to exhaust interference between the first and second combustors 2A and 2B, a series of increase corrections of the blast amount are alternately performed, and the correction value for the increase correction of the series of blast amounts is calculated as an integrated correction amount. When the value exceeds the predetermined value, the subsequent correction of the blast amount is limited in any of the above-described manners, so that the exhaust and combustion in the combined combustion apparatus 1 are stabilized, and the driving power of the motors M1 and M2 is also reduced. Can do.
[0035]
When the correction value is returned to the initial value (correction amount = 0 state) as in the first mode, the influence of exhaust interference can be quickly eliminated. As in the second aspect, when the correction of the blast amount for a predetermined time is prohibited, the control is simple and the influence of exhaust interference can be quickly eliminated. In the case where the correction value is gradually decreased for each subsequent correction as in the third aspect, since the correction of the blowing amount is gradually eliminated, the exhaust and combustion do not change suddenly, and the actual exhaust resistance The amount of air blow can be controlled with some consideration.
[0036]
Next, a modified embodiment for modifying the above embodiment will be described.
In the air flow control shown in FIGS. 6 and 7, the number of executions of the increase correction of the air flow is counted, and when the number of executions exceeds a predetermined number, the increase correction of the air flow is limited. Since the flowchart of FIG. 6 is substantially the same as the flowchart of FIG. 4 described above, different steps will be described. In S55, the air flow rate correction is executed for the first combustor 2A, and in the next S56, the first combustor 2A. The counter I for counting the number of executions of the air flow rate correction is incremented. In S59, the air flow correction is executed for the second combustor 2B, and in the next S60, the counter J for counting the number of executions of the air flow correction for the second combustor 2B is incremented.
[0037]
Next, as shown in the flowchart of FIG. 7, in S63, it is determined whether or not the time T1 is ahead of the time T2. If the time T1 is ahead, in S64, β minutes (from time T1 to time T2) For example, it is determined whether or not the set time β = 1). If the determination is No, the flag F1 is reset in S65, and then the process returns. If the determination in S64 is Yes, it is determined in S66 whether I ≧ I0 (for example, a predetermined value I0 = 4), and if the determination is No, the process directly returns. When the determination in S66 is Yes, it is determined in S70 that the air flow correction is excessively repeated, and the subsequent air flow correction is limited by any one of the same various aspects as described above. Next, in S71, the flags F1, F2 and the counter I are reset and then the process returns.
[0038]
If the determination in S63 is No and the time T2 is ahead, it is determined in S67 whether or not it is within β minutes from the time T2 to the time T1, and if the determination is No, the flag F2 is reset in S68. Return. If the determination in S67 is Yes, it is determined in S69 whether I ≧ I0 (for example, a predetermined value I0 = 4), and if the determination is No, the process directly returns. If the determination in S69 is Yes, it is determined in S70 that the airflow correction is excessively repeated, and the subsequent airflow correction is limited by any of the same various aspects as described above, and then the process returns via S71.
[0039]
As described above, due to the exhaust interference of the first and second combustors 2A and 2B, a series of increase corrections of the blast amount are alternately executed, and the number of executions of the series of increase corrections of the blast amount becomes a predetermined number or more. Sometimes, correction of the subsequent air flow rate is limited in any of the above-described modes, so that basically the same operations and effects as in the above-described embodiment can be obtained. In addition, since the number of times of increase correction of the blown air amount is used as a parameter, the arithmetic processing is not complicated and the utility is excellent.
[0040]
The embodiment described above is merely an example, and those skilled in the art can implement the present invention by appropriately changing the air flow control without departing from the gist of the present invention. For example, it is possible to obtain an integrated value of the execution time for a series of air flow corrections, and to limit the correction of the air flow when the integrated time exceeds a predetermined value. It is good also as blast volume control which ignores very small quantity of blast volume correction | amendment which does not affect to. Further, in S10 of FIG. 4 and S50 of FIG. 50, it is determined whether or not the combustion amounts of the first and second combustors 2A and 2B are steady, but strictly speaking, even if they are not steady, the combustion amount is extremely small. Even when the amount of change is small, it may be determined that the combustion amount is steady.
[0041]
【The invention's effect】
According to the first aspect of the present invention, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, the number of times of the air flow rate correction is counted, and when the count number exceeds a predetermined number, the air flow rate of the fan Since the correction prohibition means for prohibiting the correction for a predetermined time is provided, it is possible to stop the chain of increase correction of the blown air amount, to stabilize the exhaust and combustion in both the combustors, and to reduce the driving power of the motor. .
[0042]
According to the second aspect of the present invention, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, the number of air flow corrections is counted, and when the count number exceeds a predetermined number, the air flow rate of the fan Since the correction limiting means for returning the correction value to the initial value is provided, as in the first aspect, the chain of increase correction of the air flow can be stopped, the exhaust and combustion in both the combustors can be stabilized, and the motor The driving power can be saved.
[0043]
According to the third aspect of the present invention, when a series of increase correction of the air flow rate due to the exhaust interference occurs, the correction value of the air flow rate correction is integrated, and when the integrated correction amount exceeds a predetermined value, Since the correction prohibition means for prohibiting the airflow correction for a predetermined time is provided, the chain of increase correction of the airflow can be stopped as in the first aspect, the exhaust and combustion in both the combustors are stabilized, and the motor is driven. Power can be saved.
[0044]
According to the fourth aspect of the present invention, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, the correction values of the air flow rate correction are integrated, and when the integrated correction amount exceeds a predetermined amount, Since the correction limiting means for returning the correction value of the air flow correction to the initial value is provided, the chain of the increase correction of the air flow can be stopped similarly to the first aspect, so that the exhaust and the combustion in both the combustors are stabilized. The driving power of the motor can be saved.
[0045]
According to the fifth aspect of the present invention, when a series of increase corrections of the air flow rate due to the exhaust interference occurs, the correction value of the subsequent air flow rate correction is gradually decreased with respect to the normal correction amount for each correction. As in the first aspect, the chain of increase correction of the blown air amount can be stopped, the exhaust and combustion in both the combustors can be stabilized, and the driving power of the motor can be saved. be able to.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a combined combustion apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram of a control system of the combined combustion apparatus.
FIG. 3 is a schematic flowchart of control (main routine) performed by a control unit of the combined combustion apparatus.
FIG. 4 is a part of a flowchart of air flow correction control.
FIG. 5 is the remainder of the flowchart following the flowchart of FIG. 4;
FIG. 6 is a part of a flowchart of air flow correction control according to a modified embodiment.
7 is the remainder of the flowchart following the flowchart of FIG. 6. FIG.
[Explanation of symbols]
1 Combined combustion system
2A, 2B first and second combustors
3 Control unit
4 Exhaust tube
6a, 6b fan
M1, M2 motor

Claims (5)

In a combined combustion apparatus configured to discharge exhaust from two sets of combustors from a common exhaust collecting cylinder,
When two sets of combustors are operated at the same time, the shortage of the air flow of one fan is detected and the increase of the air flow is corrected. When the increase correction is performed, the composite combustion apparatus is provided with a correction prohibition unit that prohibits the fan airflow correction for a predetermined time when the count number obtained by counting the number of times of airflow correction is equal to or greater than a predetermined number of times. . In a combined combustion apparatus configured to discharge exhaust from two sets of combustors from a common exhaust collecting cylinder,
When two sets of combustors are operated at the same time, the shortage of the air flow of one fan is detected and the increase of the air flow is corrected. When the increase correction is performed, the composite is characterized in that a correction limiting means is provided for returning the correction value of the air flow correction of the fan to the initial value when the count number obtained by counting the number of executions of the air flow correction becomes a predetermined number or more. Combustion device. In a combined combustion apparatus configured to discharge exhaust from two sets of combustors from a common exhaust collecting cylinder,
When two sets of combustors are operated at the same time, the shortage of the air flow of one fan is detected and the increase of the air flow is corrected. When the increase correction is made, a combined combustion feature is provided with a correction prohibiting means for prohibiting the fan air flow correction for a predetermined time when the integrated correction amount obtained by integrating the correction values of the air flow correction becomes a predetermined value or more. apparatus. In a combined combustion apparatus configured to discharge exhaust from two sets of combustors from a common exhaust collecting cylinder,
When two sets of combustors are operated at the same time, the shortage of the air flow of one fan is detected and the increase of the air flow is corrected. When the increase correction is performed, a correction limiting means is provided for returning the correction value of the air flow correction of the fan to the initial value when the integrated correction amount obtained by integrating the correction value of the air flow correction becomes a predetermined value or more. Combined combustion device. In a combined combustion apparatus configured to discharge exhaust from two sets of combustors from a common exhaust collecting cylinder,
When two sets of combustors are operated at the same time, the shortage of the air flow of one fan is detected and the increase of the air flow is corrected. A combined combustion apparatus, comprising: a correction limiting unit configured to set a correction value for subsequent air flow correction to be gradually decreased with respect to a normal correction amount when the increase correction is performed.

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