JPH0914654A - Combustor - Google Patents

Abstract

PURPOSE: To provide a hot water supplier which controls the amount of conmbustion and the amount of air by estimating the total amount of production of CO gas produced owing to burner combustion. CONSTITUTION: A CO sensor 9 is provided on an exhaust side of a hot water supplier. Air amount detection means 23 detects the amount of air supplied from a combustion fan 5 to a burner. A CO total amount calculation unit 24 calculates the total amount of production of CO produced from the burner by multiplying the total amount of exhaust gas (excepting a water vapor component) estimated from basic data of the amount of each component produced upon combustion of a unit fuel, the amount of air, and the amount of fuel supply by CO concentration detected by the CO sensor. A next operation decision unit 43 checks a just previous control state when the total amount of CO production exceeds an allowable set value, and selectively instructs a reduction sequence operation of the amount of production of C0 matching the checked result to improve the combustion such that the amount of production of CO is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner combustion type combustion apparatus such as a water heater and a bath kettle.

[0002]

2. Description of the Related Art FIG. 11 shows a schematic configuration of a general water heater as a combustion device. In FIG. 1, a tool main body 2 is housed in a tool case 1. A burner device 4 in which a plurality of burners are arranged and unitized is installed below the combustion chamber 3 of the appliance body 2.
A combustion fan 5 for air supply and exhaust is installed on the lower side of the. A nozzle 6 is provided at the gas inlet of each burner of the burner unit 4.
Are opposed to each other, and the fuel gas is supplied to the nozzle 6 through the gas supply passage 7. In this gas supply passage 7, there is an electromagnetic valve 8 as a gas valve for opening and closing the passage,
A proportional valve 10 as a fuel supply adjusting means for controlling the gas supply amount to the burner device 4 by the valve opening amount is incorporated.

A hot water supply heat exchanger 11 is installed above the combustion chamber 3, and a water supply pipe 12 is provided at the inlet side of the hot water supply heat exchanger 11.
Is connected, and a hot water supply pipe 13 is provided on the outlet side of the hot water supply heat exchanger 11.
Is connected. The water supply pipe 12 is provided with a water inlet temperature sensor 14 for detecting the water supply temperature and a flow rate sensor 15 for detecting the water inlet flow rate, and a hot water outlet temperature sensor 16 for detecting the hot water supply temperature is provided on the hot water supply pipe 13 side. . Also, hot water heat exchanger
A CO sensor 9 for detecting the concentration of CO (carbon monoxide) in the exhaust gas is provided in the exhaust chamber on the downstream side of 11.

The combustion operation of this kind of equipment is carried out by a control device 17, which normally has a remote controller (not shown) for setting the hot water supply temperature and displaying the set temperature. ) Is connected. The control device 17 includes a combustion control unit that controls the combustion amount of the burner device 4, an air flow amount control unit that controls the rotation of the combustion fan 5 to supply the burner device 4 with an air flow amount commensurate with the combustion amount, and a CO sensor 9 C
A CO safety operation unit is provided which receives the O concentration detection value, monitors the combustion state, and forcibly stops the combustion of the burner device 4 when the CO concentration detection value reaches a predetermined dangerous concentration. .

In the figure, 18 is an igniter electrode for igniting fuel gas, 20 is a frame rod electrode for detecting the flame of the burner device 4, and 21 is a fan rotation detection such as a Hall IC for detecting the rotation of the combustion fan 5. Sensor, 22 is instrument case 1
Louvers that function as intake ports provided on the wall surface of
Is a punching metal (provided as needed) for equalizing the wind pressure toward the burner 4.

In this type of equipment, when a hot water supply plug (not shown) provided at the tip of the hot water supply pipe 13 is opened, the water supply pipe 12
When the water flows in from the inside and the flow of the water is detected by the flow rate sensor 15, the controller 17 rotates the combustion fan 5, opens the solenoid valve 8 and the proportional valve 10, drives the igniter electrode 18, and ignites. I do. Then, after confirming that the flame rod electrode 20 has detected the flame, the combustion control unit controls the valve opening drive current of the proportional valve 10 and the gas supply amount (the proportional valve 10 The valve opening amount) is controlled, and the air flow control unit controls the rotation of the combustion fan 5 so as to supply the air corresponding to the gas supply amount.

When the hot water tap is closed after the hot water is used, the passage of water to the hot water heat exchanger 11 is stopped, and when the stop of the flow of water is detected by the signal of the flow rate sensor 15, the solenoid valve 8 Is closed, and after that, when the post-purge period in which the exhaust gas in the combustion chamber 3 is almost completely discharged has passed, the rotation of the combustion fan 5 is stopped to prepare for the next hot water discharge. The CO safety operation unit constantly receives the CO detection signal of the CO sensor 9 during the combustion operation to monitor the CO concentration in the exhaust gas, and when the CO detection concentration reaches the dangerous concentration, the burner device operates. Stop combustion to improve safety against CO gas.

[0008]

Generally, a combustion fan 5 is used.
There is a relationship as shown in FIG. 12 between the air flow rate Q due to the above and the CO concentration in the exhaust gas. In this figure, A on the horizontal axis
In the section, the flame of the burner causes a lift phenomenon (lifting phenomenon) due to excess air flow, and CO increases with the increase in air flow.
The concentration increases. The section B on the horizontal axis is the section of the appropriate air ratio,
By combustion, the carbon component of the fuel gas is first changed to CO gas and further changed to CO ₂ gas, and the gas is completely combusted to maintain good combustion in which the CO concentration is substantially zero or extremely small.

The section C on the horizontal axis is a section where the air volume is insufficient, and as the air volume decreases, CO is generated due to incomplete combustion.
The rate of change from CO to CO ₂ decreases and the CO concentration increases. The section D is a section where the air volume is insufficient, and in this section, incomplete combustion further progresses, and a phenomenon occurs in which the carbon component of the gas does not become CO but becomes soot as it is. Section E shows a section where the air volume is extremely small. In this section, the air is extremely lacking and the reaction temperature is 85
When the temperature is below 0 ° C, the amount of soot generated increases, and as the air flow decreases, unburned components (H ₂ , CmHn, etc.)
Will increase.

Conventionally, the CO concentration in the exhaust gas is set to a proper CO concentration range and a dangerous concentration value, and when the detected CO concentration in the exhaust gas exceeds the upper limit of the proper CO concentration range, the CO concentration is increased. Is controlled so as to fall within an appropriate CO concentration range, and when the detected CO concentration reaches a dangerous concentration, a CO safety operation such as combustion stop is performed.

By the way, the conventional method for detecting the CO concentration and evaluating the combustion state of the burner device 4 as described above is as follows.
There is a problem that the combustion state cannot be evaluated accurately. For example, when the combustion state of the burner device 4 is deteriorated and a considerably large amount of CO gas is generated, a large amount of air is supplied from the combustion fan 5 in the direction of reducing the CO concentration, so that a large amount of CO gas is generated. Is diluted by the air supplied in large quantities, and the CO concentration detected in the exhaust gas becomes a low value. However, the CO concentration was reduced to improve combustion, or the CO gas was burned because it was diluted with air. Although it has not been improved, it is not known whether the apparent CO concentration has decreased, and the result is that the combustion state of the burner device cannot be evaluated accurately.

In the conventional example, since the combustion state of the burner is evaluated by the CO concentration, the actual CO generation amount from the burner device is hardly considered, and even if the CO generation amount is large, the CO concentration in the exhaust gas is increased. Since the idea is that the CO emission is low, the combustion control method for reducing the CO generation amount itself has not been adopted. For this reason, the total amount of CO generated from the burner device is left unchecked, and there is a problem in terms of environmental pollution.

Further, conventionally, it is considered that if the CO concentration in the exhaust gas is low, there is no particular problem in terms of safety, but in reality, even if the CO concentration is low, a large amount of CO gas is emitted from the burner device. It is assumed that it is generated. In such a case, if a gap is created in the exhaust path for some reason, and exhaust gas enters the room through this gap, a large amount of CO generated in the burner device is generated. Since the gas enters the room, the detected CO concentration in the exhaust path does not always match the indoor CO concentration, and it is assumed that the indoor CO concentration may increase. Was also very dangerous on.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to accurately evaluate the combustion state of a burner device and to reduce the total amount of CO gas generated. Environmental protection and CO
An object of the present invention is to provide a combustion device capable of improving safety reliability.

[0015]

The present invention is configured as follows to achieve the above object. That is, the present invention provides a burner device, a fuel supply adjusting means for adjusting the fuel supply amount to the burner device, a combustion fan for supplying air to the burner device, and a CO sensor for detecting the CO concentration in the exhaust gas. In a combustion apparatus equipped with, the air flow rate detection means for detecting the air flow rate supplied to the burner device by the combustion fan, and the fuel supply amount detection means for detecting the fuel supply amount to the burner device (by inverse calculation from the output And a basic data memory storing basic data of a unit theoretical air amount, a unit theoretical exhaust gas amount, and a unit generated water vapor amount when burning at least a unit amount of fuel, and the fuel supply amount detection means. Calculate the theoretical required air amount, theoretical exhaust gas amount, and generated water vapor amount when the supplied fuel burns based on the fuel supply amount detected by In the exhaust gas based on information on the theoretical combustion data detection unit, the CO concentration in the exhaust gas detected by the CO sensor, the data detected by the theoretical combustion data detection unit, and the air volume detected by the air volume detection means. And a total CO amount calculation unit for obtaining the total CO generation amount of the above.

An allowable set value is given to the total CO generation amount, and when the total CO generation amount calculated by the total CO amount calculation unit exceeds the allowable set value, the state of combustion control immediately before is checked, A next operation determination unit that determines which operation is performed among a plurality of sections of operations given in advance as an operation to reduce the total CO generation amount based on the check result is provided. A limit determination value is provided, and a risk determination unit that outputs a warning signal when the total CO generation amount calculated by the total CO amount calculation unit exceeds the upper limit setting value is provided; Is provided with a combustion amount down control unit for performing the down control of the above, a CO safety operation unit for receiving the alarm signal to stop the combustion, and the combustion signal is stopped according to the alarm signal. A counter for counting the number provided,
It is also a feature of the present invention to provide a combustion stop lock means for preventing the combustion from being used for a predetermined time when the count value of the counter reaches a preset number of times.

[0017]

In the present invention having the above-mentioned structure, the CO concentration in the exhaust gas is constantly detected by the CO sensor during the combustion operation of the combustion device. On the other hand, the air volume detecting means detects the air volume of the combustion fan, and the fuel supply volume detecting means detects the fuel supply volume supplied to the burner device. Using the detected fuel supply amount and the data stored in the basic data memory, the theoretical required air amount, the theoretical exhaust gas amount and the generated water vapor amount when the supplied fuel burns are detected as theoretical combustion data as theoretical combustion data. Detected by the department. Then, the total CO generation amount in the exhaust gas is calculated by the total CO amount calculation unit based on the detected air volume, the CO detection concentration of the CO sensor, and the theoretical combustion data.

Then, when the total CO generation amount obtained by the total CO amount calculation unit exceeds the allowable set value in the appliance for which the air ratio control is being performed, it is determined that combustion is abnormal, and the next operation determination unit determines immediately before. The combustion control state is checked, based on the check result, the most suitable one of the plurality of operations for reducing the total CO generation amount is selected, and the selected operation for reducing the total CO generation amount is performed.

When the effect of reducing the total amount of CO generated is obtained by the operation of reducing the total amount of CO generated, the combustion operation is continued under the control operating conditions, but the effect of reducing the total amount of CO generated is not obtained. When the total amount of CO generated exceeds an upper limit set value given in advance, an alarm signal is output from the danger determination unit, and upon receiving this alarm signal, combustion amount down control or combustion stop is performed. The operation of improving safety and CO safety is performed.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same names as those in the conventional example are designated by the same reference numerals, and the duplicate description thereof will be omitted. The combustion apparatus of this embodiment is intended for a water heater having the same configuration as that shown in FIG. 11, and the most characteristic feature of this embodiment is that the total amount of CO gas generated in the burner device 4 is generated. The configuration is such that the amount of air is obtained, the combustion state is evaluated based on this total CO generation amount, and combustion, air volume control, CO safety operation, etc. are performed, and other configurations are the same as the conventional example.

FIG. 1 is a block diagram showing the construction of the main part of this embodiment, in which an air flow rate detection means 23, a total CO amount calculation section 24, a fan control section 25, a risk judgment section 26, and a combustion control section 27 are shown. , C
An O-safe operation unit 28, a combustion stop lock unit 29, a fuel supply amount detection unit 40, a basic data memory 41, a theoretical combustion data detection unit 42, and a next operation determination unit 43 are configured. .

The air volume detecting means 23 detects the air volume supplied from the combustion fan 5 to the burner unit 4, and can be constructed in various forms. For example, as a first configuration example, as shown in FIG. 2, a work amount measurement unit 30, a fan rotation speed measurement unit 31, a supply air temperature measurement unit 32, a coil temperature measurement unit 33,
Memory 34, fan air volume calculation unit 35, fan air volume correction unit
And 36. In this configuration example, the memory 34 stores in the memory 34 the work of the combustion fan with the exhaust gas passage blockage rate and the fan rotation speed as parameters (this work is the drive current of the combustion fan or the drive of the combustion fan). Air volume characteristics data indicating the relationship between the air flow rate) and the air volume. The work amount measuring unit 30 measures the work amount when the combustion fan 5 is driven by detecting the fan driving current or the fan driving power. The fan rotation speed measurement unit 31 measures the fan rotation speed by the fan rotation detection sensor 21 such as a Hall IC.

The fan air volume calculation unit 35 collates with the air volume characteristic data stored in the memory 34, and the work amount measured by the work amount measuring unit 30 (fan current or fan driving power).
Then, the fan air volume is obtained from the fan rotation number measured by the fan rotation number measuring section 31, and the obtained fan air volume value is added to the fan air volume correcting section 36.

The supply air temperature measuring section 32 uses a temperature sensor,
Measure the intake air temperature of the combustion fan. Coil temperature measuring unit 33
Detects and measures the temperature of the energizing portion of the combustion fan 5, usually the coil temperature for current detection. The fan air flow rate correction unit 36 corrects the fan air flow rate obtained by the fan air flow rate calculation unit 35 by obtaining information on the supply air temperature and the coil temperature. That is, the work amount measuring unit
For the current and power measured at 30, the power factor changes as the temperature of the current-carrying part changes, and so does the work. The fan fluctuating air volume due to the fluctuation of the work amount due to this temperature is corrected by measuring the supply air temperature and the coil temperature after energization, and the accurate fan air volume value from the fan air volume correcting unit 36 is C
It is added to the O total amount calculation unit 24.

As a second configuration example of the air volume detecting means 23, the air volume may be indirectly detected by detecting the fan rotation speed of the combustion fan 5. In this case, for example, as shown in FIG. 4, relationship data between the fan rotation speed and the air volume is given in advance, and the fan rotation detection sensor 21
The fan rotation speed of the combustion fan 5 can be detected and the air volume corresponding to the detected fan rotation speed can be obtained from the data given in advance. In this case, the combustion fan 5 has temperature dependency, and even if the fan rotation speed is constant, the air volume varies depending on the temperature. When detecting the accurate air volume, as shown in FIG. The temperature T ₁ , T ₂ , T ₃ is used as a parameter to provide the relational data between the fan rotation speed and the air flow, and a temperature sensor for detecting the internal atmosphere temperature is provided in the combustion device. By using it, it is possible to detect the accurate air volume. Of course, the relational data between the fan rotation speed and the air flow rate is given as one representative temperature data, and the air flow rate value corresponding to the fan rotation speed is temperature-corrected based on the ambient temperature in the combustion device detected by the temperature sensor. You can also ask. In this case, a temperature correction calculation unit for temperature-correcting the air volume obtained from the data corresponding to the fan rotation speed is provided.

Further, as the third air volume detecting means 23, an air volume sensor for directly detecting the fan air volume can be used. In this case, as shown by the chain line in FIG. 10, for example, a passage 37 should be formed between the lower space portion of the burner device 4 and the combustion chamber 3, and an air flow sensor 38 should be provided in this passage 37. It is composed of As the air volume sensor 38, a hot-wire air velocity sensor, a Karman vortex air velocity sensor, a differential pressure sensor, or the like can be used. By using an air volume sensor having a temperature compensation function, the actual air volume of the combustion fan 5 can be accurately measured. It becomes possible to detect. In this embodiment, the air volume sensor 38 is used to detect the air volume (intake air volume) to the burner device 4.

The unit amount of fuel gas in the basic data memory 41, the value of the unit required when to 1 Nm ³ combustion in Example stoichiometric air amount ^{_{A 0 (Nm 3 / (Nm}} 3 fuel gas)), also the fuel Unit theoretical exhaust gas amount G ₀ (Nm ³ / (Nm ³ fuel gas)) generated when a unit amount of gas is burned
And the value of the unit generated water vapor amount G _H2O (Nm ³ / (Nm ³ fuel gas)) generated when the fuel gas is burned in a unit amount are also stored by being obtained by experiments or theoretical calculations. There is.

The combustion supply amount detecting means 40 detects the gas supply amount of the fuel supplied to the burner device 4, and is, for example,
By detecting the valve opening drive current to the proportional valve 10, or by detecting the required combustion heat quantity required by the combustion control unit 27 (the value of the required heat quantity for heating the incoming water so that the hot water temperature reaches the set temperature). By calculating the amount of heat output from the difference between the incoming water temperature and the outgoing hot water temperature and the amount of water, and multiplying it by the reciprocal of the heat exchange efficiency, the fuel supply amount can be indirectly detected. By providing the flow rate sensor, the fuel supply amount can be directly detected. The fuel supply amount detecting means 40 is configured by using these appropriate means.

The theoretical combustion data detection unit 42 supplies the fuel supplied to the burner device 4 based on the data stored in the basic data memory 41 and the fuel supply amount data detected by the combustion supply amount detection means 40. Theoretical required air amount V _A0 for combustion of air, theoretical exhaust gas amount V _EG , and generated water vapor amount V
_H2O and are calculated. The theoretical required air amount V _A0 is obtained by multiplying the gas supply amount V _F (Nm ³ / h) by the unit theoretical air amount A ₀ and calculating V _A0 = A ₀ × V _F. The amount V _EG is obtained by the calculation of V _EG = G ₀ × V _F , and the amount V _H2O of generated steam is V _H2O =
It is obtained by the calculation of G _H2O × V _F.

The CO total amount calculation unit 24 has information on the CO concentration in the exhaust gas detected by the CO sensor 9 and information on the air amount detected by the air amount detecting means 23 (the amount of air introduced into the burner device 4). Based on the information of each theoretical combustion data obtained by the theoretical combustion data detection unit 42, the value of the total CO generation amount generated by the combustion of the burner device 4 is calculated.

FIG. 5 schematically shows a combustion reaction model of fuel gas, in which the input air amount V _A and the fuel gas amount V _F are supplied to the burner device 4 to carry out the combustion reaction. The input air amount V _A is the theoretical required air amount V _A0 and the excess air amount V _AE (Nm
³ / h), and this combustion reaction produces combustion exhaust gas V _EG , and this combustion exhaust gas V _EG and the excess air amount V _AE that does not contribute to combustion become the total exhaust gas amount and are discharged from the exhaust path. To be done. The excess air amount V _AE is the nitrogen gas component V
_The combustion exhaust gas V _EG is the sum of _{N 2} and oxygen component V _O2, and is represented as the sum of the carbon dioxide component V _CO2 , the generated water vapor amount V _H2O, and the CO gas component V _CO .

The CO concentration R _CO (ppm) in the exhaust gas is the amount of water vapor V generated from the CO gas component V _CO in the combustion exhaust gas V _EG.
It is given by the formula (1) divided by the total amount of exhaust gas excluding _H2O .

R _CO = V _CO / (V _EG −V _H2O + V _AE ) = V _CO / (V _CO2 + V _CO + V _N2 + V _O2 ) (1)

The total CO generation amount V _CO is the CO concentration R _CO
Is calculated by the equation (2) obtained by multiplying the total amount of exhaust gas excluding the amount V _H2O of generated steam by.

V _CO = R _CO × (V _AE + V _CO2 + V _CO ) = R _CO × {V _A0 × (V _A / V _A0 ) −V _A0 + V _CO2 + V _CO } = R _CO × {V _A0 × (V _{A / V A0) -V A0 +} V EG -V H2O} ·· ··· (2)

(V _A / V _A0 ) in the equation (2) represents the air ratio. As can be seen from equation (2), CO
The total generated amount V _CO is the input air amount V _A detected by the air amount detection means 23, the CO concentration R _CO detected by the CO sensor 9, the theoretical required air amount V _A0 calculated by the theoretical combustion data detection unit 42, It can be seen that the theoretical exhaust gas amount V _EG and the generated steam amount V _H2O are obtained.

The fan control section 25 is provided with a circuit for controlling the fan rotation of the combustion fan 5, and this circuit has a relationship between the combustion amount (valve opening drive current of the proportional valve) and the target air amount as shown in FIG. Data is given, the target air volume is determined based on the data of the combustion amount (required combustion heat amount) obtained by the combustion control unit 27, and the combustion fan 5 is set so that the air volume detected by the air volume sensor 38 matches the target air volume. The fan air is supplied to the burner unit 4 by controlling the fan rotation of No.

The next operation judging section 43 is provided with the CO total amount calculating section 24.
When the total CO generation amount calculated in step 1 exceeds a preset allowable value, the combustion control state immediately before that is checked. Then, as a result of the check, the operation that most matches (conforms to) the check result from the sequence operations C _{1 to} C _n divided into a plurality of pieces for reducing the total CO generation amount according to each case of the combustion control state. Is selected, and the selected sequence operation is performed to improve combustion.

An upper limit set value of the total CO generation amount is previously given to the danger judgment unit 26, and when the total CO generation amount calculated by the total CO amount calculation unit 24 exceeds the upper limit set value, the CO It is judged that the total amount of gas generated has reached the dangerous value, and an alarm signal is output.

The combustion control unit 27 controls the valve opening amount of the proportional valve 10 in the same manner as in the conventional example to control the supply of the gas amount corresponding to the required heat amount. In this embodiment, the combustion amount down control unit is further When the warning signal is added from the danger judging section 26, the proportional valve 10 is throttled to control the combustion amount to be decreased.

When the CO safety operation unit 28 receives an alarm signal from the danger judgment unit 26, it shuts off the electromagnetic valve (gas valve) 8 to stop the combustion of the burner device 4 to ensure CO safety. In this case, in the case of immediately stopping the combustion when the warning signal is output from the danger determination unit 26, the combustion control unit
Although the combustion amount down control by 27 will not be performed,
When the combustion amount down control and the operation of the CO safety operation unit 28 are linked, when the danger determination unit 26 issues an alarm signal, first, the combustion control unit 27 performs the combustion amount down control, and the combustion amount Even if the down control is performed, the CO safety operation unit 28 may be operated to stop the combustion when the warning signal is output again by the danger determination unit 26, or the risk determination unit 26 may have the first upper limit. A limit set value and a second upper limit set value larger than the limit set value are given, and the combustion amount down control is performed when the total CO generation amount calculated by the total CO amount calculation unit 24 exceeds the first upper limit set value. The CO safety operation unit 28 may be activated when the total CO generation amount exceeds the second upper limit set value.

The combustion stop lock means 29 has a built-in counter and counts the number of times of combustion stop by the CO safety operation unit 28. When the count value reaches a preset number of times, a predetermined time (for example, During a period of 1 hour, even if a combustion operation command is added, the combustion stop state is locked by not accepting the command, and the operation of preventing combustion of the water heater is performed until the lock stop time elapses.

Generally, when the combustion is stopped, a reset operation is performed by a remote controller or the like, or the power plug is once unplugged and then plugged in again, or the hot water tap is once closed and then reopened. Although the combustion operation can be started in the reset state, the risk judgment unit 26 makes a risk judgment each time the combustion operation is started, and an alarm signal is output, perform a reset operation. However, the combustion operation cannot be restarted until the predetermined time elapses, that is, the time when the air in the room is exchanged elapses, so that CO safety is ensured.

Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS. 7, 8 and 9. When the hot water tap is opened in FIG. 7, water enters the hot water supply heat exchanger 11 through the water supply pipe 12, and the flow of this water is detected by the flow sensor (flow sensor) 15
Detected in step 101 by. This flow sensor 15
In response to the detection signal of running water from the combustion fan 5, the combustion fan 5 is rotationally activated, and combustion is started by point ignition. The operation of these steps 101 to 103 is the same as the operation of normal combustion operation.

Next, the characteristic operation of this embodiment is stepped.
It will be done after 104. First, in step 104,
The air volume is detected. Next, in step 105, the CO detected concentration of the CO sensor 9 is measured, and in step 106, the total CO generation amount is calculated.

In step 107, it is judged whether or not the calculated total CO generation amount exceeds the allowable set value. When the total CO generation amount is below the allowable set value, the total CO generation amount is at a low level, so it is determined that the combustion state is good and safe, and the combustion operation is continued. On the other hand, when the total CO generation amount is equal to or greater than the allowable set value, the number of times of occurrence of abnormality is counted in step 108 using a counter or the like. Then, in step 109, the next operation is judged,
In step 109, the absolute CO amount reducing operation is performed.

FIG. 8 shows the operation of steps 109 and 110 in detail. That is, in step 109,
If the total amount of CO generated exceeds the allowable set value, the above-mentioned step 10
When abnormality is counted in 8, check the control state of the last combustion operation. In the present embodiment, it is determined whether the target load such as the gas supply amount, the amount of hot water discharged, the hot water temperature, etc. is increasing, maintaining the same state, or decreasing.
At the same time, it is determined whether the detected air volume detected by the air volume sensor 38 is increasing, maintaining the same state, or decreasing. Then, it is determined which one of the plurality of patterns divided by each combination thereof belongs.

In this embodiment, the first pattern is used when the target load is increasing and the detected air volume is increasing, and the second pattern is used when the target load is maintained and the detected air volume is increasing. The case where the detected air volume is being maintained and is being maintained is the third pattern, and the case where the target air load is being maintained and the detected air volume is being decreased is the fourth pattern, and the target air volume is being decreased and the detected air volume is being decreased. Is discriminated as a fifth pattern. Then, it is determined from the relation between the control state of the target load and the detected air volume which division pattern the operation control state belongs to, and the next operation corresponding to the determined division pattern is instructed.

In step 110, the sequence operation of the next operation instructed in step 109 is performed to perform the operation of reducing the total CO generation amount. That is, step 109
In when the operation command of the first division pattern detected air volume in the target load is on the increase is determined that during the increase is issued, the operation of Step 110 A ₁ ~110 A _6. That is, in step 110 A ₁ , the operation state is waited for the target load to stabilize, and in step 110 A ₂ , it is determined whether or not the target load has stabilized.

When the target load is the amount of gas, for example, it is judged whether or not the valve opening drive current applied to the proportional valve 10 is stable. When the target load is the amount of hot water, the flow rate sensor 15 detects it. If the target load is the hot water temperature, the judgment is made by whether the hot water temperature detected by the hot water temperature sensor 16 is stable. If the target load is stable up to the fan rotating at Step 110 A _3, in correspondence to the increase of the target load increase the air volume, reduce the CO total emissions. Furthermore, after eliminating the insufficiency of the combustion air is temporarily up the fan rotation in Step 110 A ₄ if the target load is not stable at step 110 A _2, step 110
At A ₅ , the sequence operation for investigating the cause of the increase in the total CO generation amount is operated to find the cause of the abnormality. Then, it performs the operation to eliminate the cause of the abnormality in step 110A _6, C
Aim to reduce the total amount of O generated. Incidentally, investigation sequence to operate in step 110 A ₅ is kept supplied to the control unit in advance combustion operation.

When it is judged that the total CO generation amount is abnormal in the second pattern in which the target load is maintained and the detected air flow is increasing, the detected air flow is increasing even though the target load is being maintained. Then, it is judged that the total CO generation amount has increased due to the excess air amount, and the fan rotation down operation of step 110B is performed. When it is determined that there is an abnormality due to an increase in the total CO generation amount in the third pattern in which the target load is maintained and the detected air volume is maintained, the fan rotation up operation is performed in step 110C. Similarly, when the total amount of CO generated increases in the fourth pattern in which the target load is maintained and the detected air volume is decreasing, the fan rotation is up-controlled in step 110D.
If the total amount of CO generated increases in the fifth pattern in which the target load is decreasing and the detected air flow is also decreasing, step 110 E
The reduction operation of the total CO generation amount of _{1 to} 110E ₆ is performed. Operation in steps 110 E ₁ ~110 E ₆ is the step 110 A
It is similar to the operation of _{1 to} 110 A ₆ .

In step 111, it is judged whether or not the operation of reducing the total CO generation amount is effective. That is, it is determined whether the total CO generation amount has decreased below the allowable set value. CO
When there is a reduction effect, the air ratio of the control operation amount of the combustion operation before the CO reduction operation is corrected to the air ratio at the time of the CO generation reduction operation, and the combustion operation is continued.

On the other hand, when it is determined in step 111 that the CO reduction effect is not present, it is determined in step 115 whether the abnormal count value N has reached the set value X, and the abnormal count value N is X. Step 10 if not reached
4 and subsequent operations are repeated. On the other hand, when the abnormal count value N reaches the set value X, at step 116 CO
Judge whether the total amount generated exceeds the upper limit set value. When the total CO generation amount is below the upper limit set value, the combustion operation is continued as it is by the operation of step 104 and thereafter, and when the total CO generation amount becomes equal to or more than the upper limit set value, an alarm signal is output. Then, using this alarm signal, various safety operations shown in FIG. 9 are performed.

In the operation of FIG. 9A, when the alarm signal is output, the down control of the gas amount (combustion amount) is performed in step 117. After this combustion amount down control, the step of FIG. At 116, it is determined whether or not the total CO generation amount falls below the upper limit set value. When the total CO generation amount is equal to or larger than the upper limit set value, the gas amount down control is repeatedly performed to reduce the total CO generation amount. Is controlled to decrease by reducing the gas amount. When the total CO generation amount falls below the upper limit set value, the combustion operation is continued in that state.

In step 118 of FIG. 9B, an alarm signal is received when it is determined in step 116 of FIG. 7 that the total CO generation amount is equal to or more than the upper limit set value, and step 119 is executed.
The solenoid valve (gas valve) 8 is shut off with and the combustion is stopped in step 120. In step 121, it is determined whether or not the number of combustion stop has reached the set number of times. If the number of combustion stop does not reach the set number, it is confirmed in step 122 that the hot water tap is once closed, and the operation after step 101 in FIG. 7, that is, when the hot water tap is opened again, the combustion operation is performed. To do. On the other hand, when it is determined in step 121 that the number of combustion stops has reached the set number, step 12
When the combustion stop state is locked for a predetermined time in step 3 and the set time for releasing this lock has elapsed, step 10 in FIG.
Be able to perform the operations after 1.

According to this embodiment, since the total amount of CO generated in the exhaust gas is calculated, this CO
The quality of the combustion state of the burner device 4 can be accurately evaluated based on the value of the total amount of generation.

Further, by performing the air volume control and the combustion control by utilizing the total CO generation amount, it is possible to perform the combustion operation in the state where the total CO generation amount is the lowest value, so that the apparent concentration reduction can be achieved. Not the CO generated from the burner device 4.
It is possible to reduce the total amount of generation, thereby achieving clean combustion with less influence of environmental pollution.

Furthermore, when performing CO safety operation, CO
As the operation such as combustion stop is performed assuming that the total amount of CO2 generated enters the room, the accuracy of safety is improved and CO
Compared to the method of CO safety using the concentration value, C
O The safety reliability can be sufficiently enhanced.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, when a differential pressure sensor or a wind speed sensor is used as the air volume detection means 23, for example, as shown in FIG.
Can be provided.

Further, in the above-mentioned embodiment, a single-function water heater (a water heater having only a hot water supply function) has been described as an example of the combustion apparatus, but the present invention is not limited to hot water supply and additional heating, or hot water supply and hot water heating. Combined water heater with both functions of, and other,
It is applied to a combustion device having various burners such as a bath, a heater, an air conditioner, an air conditioner, and an air conditioner.

Further, although the combustion fan 5 is of the pushing type in the above embodiment, it may be of the suction type.

[0062]

Since the present invention is configured to obtain the total CO generation amount in exhaust gas (total CO generation amount in the burner device), the obtained total CO generation amount is used to By evaluating the combustion state, there is a problem in the case of evaluating the combustion state based on the CO concentration as in the conventional example, that is, even if the CO concentration is reduced, it may be reduced to improve the combustion, or the combustion may not be improved. Nevertheless, it is possible to solve the problem that it is not possible to determine whether the CO concentration apparently has decreased due to being diluted with a large amount of air, and it is possible to accurately evaluate the quality of the combustion state.

Further, when the total CO generation amount exceeds the allowable set value, the next operation judging unit selects and commands the best sequence operation for reducing the total CO generation amount based on the check of the immediately preceding combustion control state. It is possible to efficiently perform the operation of reducing the total CO generation amount, and even if the total CO generation amount exceeds the allowable set value, the self-correction action improves the combustion performance to reduce the total CO generation amount. Therefore, there is an excellent effect that the combustion operation with high safety against CO can be performed.

Further, by using the value of the total CO generation amount, CO
By controlling the air flow rate so that the total generated amount becomes the minimum, it is possible to achieve clean combustion with less influence of environmental pollution, and by performing the safe operation of CO based on the total CO generated amount, The accuracy of the CO safety operation can be improved, and the reliability of the CO safety operation can be sufficiently enhanced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a combustion apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration example of an air volume detection means.

FIG. 3 is an explanatory diagram of air volume characteristic data used to detect an air volume.

FIG. 4 is a graph showing the relationship between fan rotation speed and air volume.

FIG. 5 is a conceptual explanatory diagram of a combustion reaction.

FIG. 6 is an explanatory diagram of air volume control data in the present embodiment.

FIG. 7 is a flowchart illustrating the operation of the present embodiment.

8 is a detailed diagram of the operation of steps 109 and 110 in FIG. 7. FIG.

9 is a flowchart of an operation example following step 116 of FIG.

FIG. 10 is an explanatory diagram showing various examples of forming a passage 37 in which the air volume detection means is constituted by a differential pressure sensor or a wind speed sensor when the sensor is installed.

FIG. 11 is a schematic configuration diagram of a general water heater as a combustion device.

FIG. 12 is an explanatory diagram showing a relationship between an air flow rate Q and a CO concentration.

[Explanation of symbols]

 4 Burner device 5 Combustion fan 9 CO sensor 23 Air volume detection means 24 CO total amount calculation section 26 Danger determination section 28 CO safe operation section 29 Combustion stop lock means 43 Secondary operation determination section

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[Procedure amendment]

[Submission date] September 22, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 4

FIG. 6

FIG. 11

FIG.

[Fig. 2]

[Figure 3]

[Figure 5]

FIG. 10

FIG.

FIG. 7

[Figure 8]

FIG. 9

Claims (6)

[Claims] 1. A burner device, a fuel supply adjusting means for adjusting a fuel supply amount to the burner device, a combustion fan for supplying air to the burner device, and a CO sensor for detecting a CO concentration in exhaust gas. In a combustion apparatus provided with the combustion fan, an air volume detection means for detecting an air volume supplied to the burner device, a fuel supply amount detection means for detecting a fuel supply amount to the burner device, and burning at least a unit amount of fuel. Based on the basic data memory that stores the basic data of the unit theoretical air amount, the unit theoretical exhaust gas amount, and the unit generated steam amount when performing, and the fuel supply amount and the basic data detected by the fuel supply amount detection means. A theoretical combustion data detector for obtaining a theoretical required air amount, a theoretical exhaust gas amount, and a generated water vapor amount when the supplied fuel burns;
The total amount of CO generated in the exhaust gas based on the information on the CO concentration in the exhaust gas detected by the sensor, the data detected by the theoretical combustion data detection unit, and the air volume detected by the air volume detection means. A combustion device having a calculation unit. 2. An allowable set value is given to the total amount of CO generated,
When the total CO generation amount calculated by the total CO amount calculation unit exceeds the allowable set value, the state of combustion control immediately before is checked, and it is given in advance as an operation for reducing the total CO generation amount based on the check result. The combustion apparatus according to claim 1, further comprising: a next operation determination unit that determines which operation is to be performed among the plurality of divided operations. 3. A risk judgment unit that outputs an alarm signal when the CO total generation amount is given an upper limit set value and the CO total generation amount calculated by the CO total amount calculation unit exceeds the upper limit set value. The combustion apparatus according to claim 1 or claim 2 having. 4. The combustion device according to claim 3, further comprising a combustion amount down control unit for receiving a warning signal and performing a combustion amount down control. 5. The combustion apparatus according to claim 3, further comprising a CO safety operation unit that receives a warning signal and stops combustion. 6. A combustion stop lock, which is provided with a counter for counting the number of times combustion is stopped in response to an alarm signal, and which prevents use of combustion for a predetermined time when the count value of the counter reaches a preset number of times. A means for providing means
A combustion device as described.