JPH11337060A - Combustor equipped with co sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge whether or not the life of an aparatus substantially completes its span with simple self diagnosis by grasping an actual combustion state (CO value). SOLUTION: A CO sensor-equipped combustor is adapted such that when CO concentration detected by a CO sensor 22 provided on an exhaust section 4a exceeds a predetermined value, the number of revolutions of a fan 7 is increased to correct stepwise combustion conditions. In the combustor, there is provided a controller 15. The controller is adapted such that when the correction of the number of revolution of the fan reaches the predetermined number of times, the controller judges whether or not the state of the use of the combustor exceeds a predetermined level. If so, then the controller reduces an output and continues combustion operation. When the combustion conditions are not improved successively thereafter, the life is displayed and the combustion operation is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor with a CO sensor which can control and operate to prevent incomplete combustion by detecting the concentration of CO in exhaust gas discharged during a combustion operation.

[0002]

2. Description of the Related Art Conventionally, in order to prevent incomplete combustion in a gas combustor such as a gas water heater which causes carbon monoxide poisoning, a CO sensor is attached to an exhaust portion of the gas combustor.
A type of CO that can always detect the CO concentration in the exhaust gas discharged during operation of the combustor by the O sensor.
There is a combustor with a sensor.

[0003] In the above combustor with a CO sensor, the amount of combustion air supplied to the combustion section by a fan is changed according to the detected value of the CO concentration in the exhaust gas detected by the CO sensor, thereby improving the combustion state. Or when the CO concentration exceeds a certain level, the combustion can be stopped.

[0004] In general, in a combustor, soot and dust adhere to an air passage in the combustor due to long-term deterioration, and it becomes difficult for combustion air to flow from a fan. As a cause, CO having a concentration exceeding the safety standard CO concentration is contained in the exhaust gas, which may cause an undesirable state.

Therefore, in the conventional combustor, the empirical fact that the combustor is liable to cause incomplete combustion due to long-term deterioration has been used to determine the product life based on the following criteria. That is, the operating time from the start of use of the combustor is integrated, and if the integrated value exceeds a certain integrated value that is set to cause the occurrence of troubles such as incomplete combustion, the product life is temporarily reached. Was judged to have been done. Therefore, the determination of the product life has been one measure of replacement of the combustor itself or replacement of necessary parts.
The above-mentioned product life usually refers to a state in which the combustor cannot exhibit the expected performance significantly. Here, for example, the following states are used. That is, if the combustor is used for a long time, the air passage in the combustor becomes narrow due to the adhesion of soot, dust, dew or the like at the time of combustion, so that it is clogged. When the air passage becomes narrow, the combustion air supplied from the combustion fan becomes difficult to flow in the combustion section, and incomplete combustion occurs due to an insufficient amount of air. If such a state becomes permanent and a state in which good combustion is no longer performed, the life is reached.

[0006]

However, as described above, when the life is determined based on the integrated value of the use time from the start of use of the combustor, the life of the combustor has reached a certain value. In addition, there is a problem that a product that can be used as a combustor because of its good use condition is uniformly judged to be the product life. On the other hand, in the case where the product has reached the end of its service life in spite of the fact that it has not reached the sum of a certain amount of use time (apparently it has not reached the end of its service life), it cannot be determined that this is the product life. was there. Thus, it is not always appropriate to simply judge the life of the combustor based solely on the integrated value of the use time from the start of use of the combustor.

The present invention has been made in view of the above-mentioned problems of the conventional combustor, and determines the life of the combustor efficiently based on the integrated value of the use time from the start of use of the combustor. Instead, it is an object of the present invention to provide a combustor with a CO sensor that can determine whether or not the life is substantially reached by a simple self-diagnosis by grasping an actual combustion state (CO value).

[0008]

In order to achieve the above object, a combustor with a CO sensor according to the present invention has a CO concentration in exhaust gas discharged during combustion operation by a CO sensor provided in an exhaust portion of a combustor body. And a combustion sensor with a CO sensor that can improve the combustion state by changing the amount of combustion air supplied from the fan according to the detected value, wherein the detected value of the CO concentration is equal to or more than a predetermined value. , The amount of combustion air is increased by increasing the fan speed in a stepwise manner, and the improvement of the combustion state is controlled so that the detected CO concentration becomes less than a certain value. In the correction of the fan rotation speed, if the correction reaches a certain number of times, it is further determined whether or not the usage state of the combustor so far exceeds a certain level, and the usage of the combustor so far is determined. The situation is constant If you are beyond the level,
A controller is provided that at least reduces the output to continue the combustion operation and, if the combustion state does not continue to improve after that, displays the life and controls the combustion operation to stop by the safety operation. This is the first feature. Further, in addition to the first feature, the combustor with a CO sensor according to the present invention has a condition in which the usage of the combustor has been reduced so far when the correction of the fan speed for improving the combustion state has reached a certain number of times. A second feature is that a controller is provided for displaying a failure when the level exceeds a certain level and for reducing the output and continuing the combustion operation. Further, in the combustor with the CO sensor according to the present invention, in addition to the first or second feature, if the combustion state is not continuously improved even after the output is reduced, the fan rotation speed is reduced again. A third feature is that a controller is provided which performs a correction for increasing the number of times, and when the number of corrections reaches a certain number of times, displays a life and stops the combustion operation by a safe operation.
Further, in the combustor with a CO sensor according to the present invention, the CO concentration in the exhaust gas discharged during the combustion operation is detected by a CO sensor provided in an exhaust portion of the combustor body, and supplied from a fan according to the detected value. A CO sensor-equipped combustor capable of improving the combustion state by changing the amount of combustion air, wherein when the detected value of the CO concentration becomes a certain value or more, the fan rotation speed is stepwise increased and corrected. The amount of combustion air is increased to control the improvement of the combustion state so that the detected CO concentration becomes less than a certain value, and the correction reaches a certain number of times in the correction of the fan speed for the improvement of the combustion state. If the condition of use of the combustor has not exceeded a certain level, it is further determined whether or not the condition of use of the combustor has exceeded a certain level. Then Perform continuous operation, when the correction of the fan rotation speed reaches a certain number of times in and after that, further comprising a controller that controls to stop the combustion operation by the safety operation and the fourth feature.

Here, in the above feature, for the stepwise correction of the number of rotations of the fan, an appropriate increase amount of the number of rotations per one rotation and a value of a certain number of rotations are determined in advance by experiments or the like.
Further, when the usage status of the combustor exceeds a certain level, or when the usage level of the combustor does not exceed the certain level, the `` constant level '' refers to a usage period from the start of use of the combustor, an integrated value of combustion time, From the integrated value of the number of times of combustion, or a value that comprehensively considers these values, a value at which the life has been reached due to use deterioration can be set in advance by experiments or the like. Further, the degree of the output reduction of the combustor can be determined in advance according to the model or the like by experiments or the like, and thereby the total amount of CO released into the room or the like can be reduced at all.

[0010]

FIG. 1 is a block diagram of a combustor with a CO sensor according to an embodiment of the present invention, and FIG. 2 illustrates an operation sequence in a combustor with a CO sensor according to an embodiment of the present invention. It is a flowchart for performing.

First, the configuration of a combustor with a CO sensor according to an embodiment of the present invention will be described with reference to FIG.
This combustor with a CO sensor has at least an inlet line 1
A hot water outlet line 2 and a hot water supply line 3; a heat exchanger 5, a burner mechanism 6, a combustor main body 4 including a fan 7 and the like; an exhaust portion 4a of the combustor main body 4; A bypass pipe 8 that directly goes to the hot water supply path 3 without passing through the main body 4, a bypass water amount adjustment valve 9 disposed in the bypass pipe 8, and an input water temperature sensor 10 provided in the input water pipe 1.
And a water flow sensor 11, a tap water temperature sensor 12 provided in the tap water pipe 2, a tap water temperature sensor 13 provided in the tap water pipe 3, and an overflow prevention adjusting valve 14. Reference numeral 7a denotes a rotation speed sensor of the combustion fan 7, and 16 denotes a flame detector, which is located near a part of the combustion tube constituting the burner mechanism 6 and detects the presence or absence of a burner flame from the combustion tube. .

A gas line 17 for supplying combustion gas to the burner mechanism 6 is provided with an original gas solenoid valve 19 and a hot water supply gas proportional valve 18 near the base end thereof. At the tip, a plurality of capacity switching gas solenoid valves 20 for switching the supply capacity of the combustion gas to the burner mechanism 6 are provided.
a, 20b, and 20c are arranged, and one of the capacity switching gas solenoid valves 20a is used for ignition. Further 21
Reference numeral denotes an ignition plug, and reference numeral 22 denotes a CO sensor provided in an exhaust portion 4a at an upper portion of the combustor main body 4. In the present combustor which also has a hot water supply function composed of the respective components as described above, the controller 15 controls each operation of the combustor, and performs operation control described below.

Thus, in the combustor with a CO sensor according to the above configuration, for example, when hot water supply combustion is performed in the hot water supply operation, the original gas solenoid valve 19 is first opened, and then the capacity switching gas solenoid valves 20a and 20b. , 20c, the ignition valve 20a is opened, and the ignition is performed by the ignition plug 21. When the ignition is confirmed by the flame detector 16, the solenoid valve 20b is opened, and the solenoid valve 20c is opened.
Are sequentially opened so that the capacity switching gas solenoid valve is opened,
Combustion takes place.

In the above hot water supply combustion and the like, exhaust gas containing CO is exhausted. The CO concentration in the exhaust gas is detected by the CO sensor 22, and the detected CO concentration is equal to or more than a predetermined value (CO concentration ≧ X ppm). ), The controller 15 controls to increase the amount of combustion air by increasing the number of revolutions of the fan 7 in a stepwise manner, and to improve the combustion state so that the CO concentration becomes less than a certain value. In the above-described control, when the increase correction of the fan rotation number has reached a certain number of times (for example, the number of corrections n is 5) and the usage state of the combustor exceeds a certain level, the output is reduced. Although the operation is continued to continue, the combustion state is still not improved, and if the number of gradual increases in the fan speed reaches a certain number (for example, the number of corrections n is 8), the life is displayed. At the same time, the safety operation is promptly performed to stop the combustion operation. All of these control means are built in the controller 15 and are automatically operated when necessary. Regarding the value of X ppm in the CO concentration, an appropriate value is determined in advance by experiments.

On the other hand, when the usage state of the combustor so far does not exceed a certain level, if the detected CO concentration becomes a certain value or more (CO concentration ≧ X ppm),
The controller 15 increases the amount of combustion air by increasing the number of revolutions of the fan in a stepwise manner to improve the combustion state so that the CO concentration becomes less than a predetermined value. If the number of times has been reached, a failure is displayed and the combustion operation is continued. After that, if the combustion state is not improved even after performing the stepwise increase correction of the fan rotation speed, the safety is secured when the correction reaches a certain number of times (for example, the number of corrections n is eight). It is configured to stop combustion operation by operation,
All of these control configurations are also built in the controller 15,
It works automatically when needed.

[0016] Note that "the usage state of the combustor is at a certain level" in the usage state of the combustor as described above,
Usage period from the start of use of the combustor, integrated value of combustion time,
From the integrated value of the number of times of combustion, or a value that comprehensively considers these, a value that is theoretically assumed to reach the end of life due to use deterioration means a level that has been set in advance by experiments or the like, and that value is determined in advance.

Next, an operation sequence of the combustor with the CO sensor according to the above configuration will be described with reference to FIG. Now, it is assumed that the operation switch of the combustor with the CO sensor is turned on and the hot water supply operation is started. The water that has flowed into the heat exchanger 5 due to the combustion of the burner is heated to become hot water, but the exhaust gas is discharged from the exhaust part 4a to the outside. At this time, CO
The CO concentration in the exhaust gas is detected by the sensor 22,
This detected value is input to the controller 15, and it is determined whether or not abnormal combustion has occurred (step S1).
That is, the detected CO concentration is equal to or higher than a predetermined value (CO concentration ≧ Xpp
m) (Yes in step S1), the controller 15 issues an instruction to increase and correct the fan rotation speed (step S2). When the combustion state is improved by the correction of the increase in the fan rotation speed, incomplete combustion can be eliminated (CO concentration <X ppm), but the number of corrections can be reduced without improving the combustion state (CO concentration ≥ X ppm). When a certain number of times (for example, five times) is reached (Yes in step S3)
The level of the usage status of the combustor is determined. That is, it is determined whether or not the usage state exceeds a certain level which is set in consideration of, for example, the usage period of the combustor, the integrated value of the combustion time, the integrated value of the number of times of combustion, and the like (step S4). ). Here, if the usage status of the combustor so far exceeds a certain level (Yes in step S4), the controller 15 reduces the output of the combustor by input down, and also controls the remote controller (not shown) of the combustor. A failure display indicating that the combustor has failed is displayed on another display unit (step S5). If the detected value of the CO concentration becomes equal to or more than a predetermined value (CO concentration ≥ X ppm) without the combustion state being improved even by this output reduction (YES in step S6), the rotational speed of the fan 7 is increased stepwise. The increase is corrected (step S7), and control is performed so as to improve the combustion state. When the combustion state is improved by the correction of the fan speed, incomplete combustion can be avoided. However, when the number of corrections reaches a certain number (for example, eight times) (Yes in step S8), the controller 15 A non-controlling remote controller or other display unit displays a service life indication indicating that the service life has expired, and performs a safe operation of the apparatus to stop the combustion (step S9). Note that the life display, the safe operation, and the integrated value of the number of corrections are as follows.
It is cleared by power reset (step S1
0).

On the other hand, if the usage status of the combustor so far has not reached the certain level in step S4 (No in step S4), the controller 15 displays a failure (step S11). After that, the detected value of the CO concentration is monitored, and the combustion state is not improved (CO concentration ≧ Xpp
m) (Yes in step S12), the fan rotation speed is increased stepwise (step S13), and the number of corrections is fixed (for example, 8) without improving the detected value of the CO concentration.
If the number of times has been reached (Yes in step S14), the controller 15 performs a safe operation to stop the combustion (step S15).

However, according to the combustor with the CO sensor configured as described above, the usage state of the combustor so far exceeds a certain level, and according to the conventional concept, it is determined that the life is tentative. Even if the combustor has reached the integrated value of a certain usage time, if the combustion state can be improved by correcting the fan rotation speed and no abnormal combustion occurs, it will be used as a combustor as it is. In some cases, it can be used continuously. In addition, when the usage state of the combustor exceeds a certain level, if the combustion state cannot be improved even by correction of the fan rotation speed or the like, it is possible to substantially determine that the life has expired, and quickly Since the combustion can be stopped by entering the safe operation, a very reasonable life judgment can be performed. On the other hand, if the usage state of the combustor has not reached a certain level, even if it can be said that the combustor can be used apparently, no improvement in the combustion state is observed even by correcting the increase in the fan speed. In such a case, a failure is displayed and the combustion can be stopped by promptly performing a safe operation to ensure safe use. Further, in this case, since the integrated value of a certain use time determined as the life has not been reached, one measure that can be reused by maintenance such as repair can be obtained.

[0020]

According to the present invention, there is provided the above construction.
According to the combustor with a CO sensor described in the above, the CO concentration in the exhaust gas discharged during the combustion operation is detected by the CO sensor provided in the exhaust portion of the combustor body, and supplied from the fan according to the detected value. A combustion chamber with a CO sensor capable of improving the combustion state by changing the amount of combustion air, wherein when the detected value of the CO concentration becomes equal to or higher than a predetermined value, the rotational speed of the fan is stepwise increased and corrected. The amount of combustion air is increased to control the improvement of the combustion state so that the detected CO concentration is less than a certain value.In the correction of the fan speed for the improvement of the combustion state, the correction is performed at a certain number of times. If it has reached, it is further determined whether or not the usage of the combustor so far exceeds a certain level, and if the usage of the combustor so far exceeds a certain level,
Since at least the output is reduced and the combustion operation is continued, and if the combustion state does not continue to improve even after that, a controller is provided for performing control to display the life and stop the combustion operation by a safe operation, For example, even if the usage time exceeds a certain integrated value, the combustion air amount is increased by correcting the fan rotation speed stepwise even in a combustor which was conventionally determined to have a life, thereby increasing the amount of combustion air, and the CO concentration becomes less than a certain value. If the combustion state can be improved as described above, it can be used continuously, and the life of the combustor can be extended. In addition, if the combustion state cannot be improved even if the number of revolutions of the fan is increased in a stepwise manner and the combustion state cannot be improved, the life can be substantially determined, so that the life can be more reliably determined as compared with the related art. Also, by lowering the output,
The total amount of CO generated in the combustor can be reduced, and the rise in CO concentration in a room or the like can be reduced accordingly. Furthermore, even if incomplete combustion occurs where the output is near the maximum due to deterioration over time, a good combustion state can often be obtained where the output is relatively small. By doing so, the combustion state is improved, and it is expected that the use of the combustor can be extended.
Further, according to the combustor with the CO sensor according to claim 2,
In addition to the above-described effects of the configuration according to claim 1, when the correction of the fan speed for improving the combustion state reaches a certain number of times, the usage state of the combustor so far exceeds a certain level. If there is a controller that displays a failure and continues the combustion operation by reducing the output, it is possible to display a failure in the middle stage before displaying the life and to raise the user's recognition Can be. According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the combustion state is not continuously improved even after the output is reduced. Has a controller that performs stepwise increase correction of the fan rotation speed again and, when the correction reaches a certain number of times, displays the life and controls the combustion operation to be stopped by a safe operation. Even later, it is possible to pursue a detailed possibility for improving the combustion state, and it is possible to extend the life of the combustor for a longer life without reaching the service life display. According to the combustor with the CO sensor according to the fourth aspect, the CO sensor in the exhaust portion of the combustor body detects the CO concentration in the exhaust gas discharged during the combustion operation, and according to the detected value. A combustor with a CO sensor that is capable of improving the combustion state by changing the amount of combustion air supplied from a fan. When the detected value of the CO concentration becomes a certain value or more, the fan rotation speed is gradually increased. The correction of the increase increases the combustion air amount, controls the improvement of the combustion state so that the detected CO concentration becomes less than a fixed value, and corrects the fan rotation speed for the improvement of the combustion state. Has reached a certain number of times, it is further determined whether or not the usage status of the combustor so far exceeds a certain level, and if the usage status of the combustor so far does not exceed a certain level In the late A controller is provided to display and perform continuous operation, and to control the combustion operation to be stopped by a safe operation when the correction of the fan speed reaches a certain number of times thereafter. If the situation does not exceed a certain level, even if the combustion state is bad, the combustion state is improved so that the CO concentration becomes less than a certain value by correcting the fan rotation speed stepwise and increasing it. Even if it is not possible to immediately improve the combustion state, without stopping combustion immediately, first display only the failure to alert the user's awareness and continue driving the user. If the fan speed is corrected more than a certain number of times, safety can be assured by stopping the combustion operation by safe operation. . In addition, when the usage state of the combustor has not exceeded a certain level, the user is provided with the above-mentioned failure display, which indicates that the life of the combustor is not a service life but can be reused by performing maintenance such as repair. Can be given to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a combustor with a CO sensor showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation sequence of a combustor with a CO sensor according to an embodiment of the present invention.

[Explanation of symbols]

 4 Combustor body 4a Exhaust section 5 Heat exchanger 6 Burner mechanism 7 Fan 7a Rotation speed sensor 15 Controller 22 CO sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobuhiko Tokage 93rd Edocho, Chuo-ku, Kobe-shi, Hyogo

Claims (4)

[Claims] 1. A CO sensor provided in an exhaust portion of a combustor body detects a CO concentration in exhaust gas discharged during a combustion operation, and changes an amount of combustion air supplied from a fan according to the detected value. A combustor with a CO sensor capable of improving the combustion state by increasing the amount of combustion air by increasing the fan rotation speed stepwise when the detected value of the CO concentration becomes a certain value or more. In addition, while controlling the improvement of the combustion state so that the detected CO concentration becomes less than a certain value, in the correction of the fan rotation speed for the improvement of the combustion state, when the correction reaches a certain number, the combustion is stopped. It is further determined whether the usage status of the combustor has exceeded a certain level, and if the usage status of the combustor has exceeded a certain level, at least the output is reduced and the combustion operation is performed. Succeed Together we are, if not subsequently continued improvement is seen in the combustion state even in, CO sensor-equipped combustor, characterized in that it comprises a controller that controls to stop the combustion operation by safe operation causes the life display. 2. When the correction of the number of revolutions of the fan for improving the combustion state has reached a certain number of times and the usage status of the combustor has exceeded a certain level, a failure is displayed and The combustor with a CO sensor according to claim 1, further comprising a controller that reduces the output and continues the combustion operation. 3. If the combustion state does not continue to improve even after the output has been reduced, the fan rotation speed is increased and corrected again stepwise, and when the correction reaches a certain number of times, The combustor with a CO sensor according to claim 1 or 2, further comprising a controller for performing a control for displaying the life and stopping the combustion operation by a safe operation. 4. A CO sensor provided in an exhaust portion of a combustor body detects a CO concentration in exhaust gas discharged during a combustion operation, and changes an amount of combustion air supplied from a fan according to the detected value. A combustor with a CO sensor capable of improving the combustion state by increasing the amount of combustion air by increasing the fan rotation speed stepwise when the detected value of the CO concentration becomes a certain value or more. In addition, while controlling the improvement of the combustion state so that the detected CO concentration becomes less than a certain value, in the correction of the fan rotation speed for the improvement of the combustion state, when the correction reaches a certain number, the combustion is stopped. It is further determined whether or not the past usage of the combustor exceeds a certain level.If the past usage of the combustor does not exceed a certain level, a failure is indicated and continuous operation is performed. ,and Fan when the rotation speed of the correction has reached a predetermined number of times, CO combustor with sensors, characterized in that it comprises a controller that controls to stop the combustion operation by the safety operation in the following.