JP3112601B2 - Gas burner monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for monitoring a gas burner, and more particularly to a method for monitoring the combustion of a gas burner for a gas boiler or a gas absorption chiller / heater using a method of detecting pressure using a pressure sensor. The present invention relates to a gas burner monitoring device for performing normal combustion safely, and when there is an abnormality in a control motor, a blower, a gas supply, a mechanical linkage, and the like, outputs a sign of an inspection, an abnormality, and the like.

[0002]

2. Description of the Related Art There is almost no conventional system for monitoring the combustion of a gas burner, which is checked by an administrator by inspection, or a combustion air flow rate by a blower according to an output of a combustion detection sensor (for example, a thermocouple) for detecting a combustion state. (Japanese Patent Publication No. 3-59332)
However, the air-fuel ratio may deviate due to various causes. If the air-fuel ratio deviates greatly, a large amount of unburned gas is discharged, which is dangerous. O ₂ and CO in combustion gas using exhaust gas analyzer
There is a method of monitoring the air-fuel ratio by measuring the air-fuel ratio. However, the oxygen sensor and the like are expensive, require maintenance and inspection, and have a short life. Various combustion devices for preventing the occurrence of an air-fuel ratio abnormality have been proposed (JP-A-62-252).
No. 826, Japanese Patent Publication No. 4-67091, etc.), the amount of fuel supplied changes due to air-fuel ratio correction, so that a predetermined amount of heat cannot be obtained in the combustion section, the control becomes complicated, and the cost becomes high. there were.

[0003]

The purpose of the 0008] The present invention, without using a sensor for analyzing O ₂ and CO, etc. in the combustion gas, the combustion of the gas burner by a method for detecting the pressure using a pressure sensor It monitors and performs normal combustion safely, and controls motor, blower, gas supply,
An object of the present invention is to provide an inexpensive and simple gas burner monitoring device that can determine the type and degree of abnormality when a mechanical linkage or the like has an abnormality, and that outputs a sign of inspection, abnormality, and the like.

[0004]

Means for Solving the Problems In view of the above problems, the present inventors have conducted intensive studies and found that the gas pressure or the air pressure detected by using the pressure sensor can be reduced by the gas pressure and the gas pressure corresponding to the load factor during normal combustion. The present invention has been made based on the finding that the type and degree of abnormality can be determined from the amount of change in comparison with the air pressure (reference value).

[0005] The invention of claim 1 of the present invention relates to gas pressure and air pressure.
A monitoring device that monitors gas burner abnormalities due to air pressure
Gas pressure and air pressure corresponding to the load factor during normal combustion.
A storage device that stores the air pressure and the detected gas pressure or empty
Calculate the rate of change of air pressure with respect to the data during normal combustion
And an arithmetic unit for storing the obtained value in the storage device;
By comparing the value obtained by this arithmetic unit with the set value, various
And a decision device for discriminating and outputting a normal condition.
This is a gas burner monitoring device .

According to a second aspect of the present invention, the gas pressure and the air
A monitoring device that monitors gas burner abnormalities due to air pressure
Gas pressure and air pressure corresponding to the load factor during normal combustion.
A storage device that stores the air pressure and the detected gas pressure or empty
Calculate the rate of change of air pressure with respect to the data during normal combustion
And an arithmetic device for storing the obtained value in the storage device.
The type of abnormality can be determined.
This is a gas burner monitoring device .

[0007]

In the present invention, in detecting an abnormal state of the combustion device (gas burner), the abnormality of the combustion state is determined by monitoring the gas pressure and the air pressure corresponding to the load factor. By storing the gas pressure and the air pressure corresponding to the load factor in the storage device, the reference values are used for determination. When the combustion becomes abnormal, the gas pressure or the air pressure changes with respect to the respective reference values. Therefore, the type and degree of the abnormality can be determined based on the amount of change. The types of troubles that can be diagnosed by the gas burner monitoring device of the present invention include the following abnormalities. Control motor trouble. Blower failure. Gas supply side trouble. Linkage mechanism failure.

[0008]

Next, the present invention will be described in detail, but the present invention is not limited to the embodiments without departing from the gist of the present invention.
FIG. 1 is an explanatory view of a combustion apparatus using a linkless gas burner used in the present invention. The burner main body 1, blower 2, air damper 3, air damper control motor 4a, fuel control valve control motor 4b, fuel gas 5, fuel control. valve 6, the gas pressure sensor -7, air pressure sensor -8 made, mechanical linkage 9, the gas pressure sensor 7 detects the gas pressure P _G in the downstream side of the fuel control valve 6, air pressure sensor 8 air damper 3 detects the air pressure P _a on the downstream side of the burner body 1 of the wind box, and outputs a signal.

FIG. 2 is an explanatory view of another gas burner used in the present invention which is similar to the gas burner of FIG. 1 except that one control motor 4c is used. The fuel control valve 6 and the air damper 3 are provided by a mechanical linkage 9. Control. For each gas burner, a highly reliable commercially available micro pressure sensor was used for the gas pressure sensor 7 and the air pressure sensor 8.

FIG. 3 shows a monitoring system of the present invention using the linkless burner shown in FIG. The gas pressure sensor 7 measures the gas pressure, feeds it back to the opening control device 10, and outputs an open signal and a close signal for opening and closing the fuel control valve 6 to the fuel control valve control motor 4b, Conversely, upon receiving the opening signal, the fuel control valve 6 is operated. The air pressure is measured by the air pressure sensor 8, and the measured air pressure is fed back to the opening control device 10. The opening signal and the closing signal for adjusting the opening of the air damper 3 so as to keep the air-fuel ratio constant are output. Conversely, the opening degree signal is received by the air damper control motor 4a, and the air damper 3 is operated. The relationship between the gas pressure and the air pressure corresponding to the load factor (14) during normal combustion is stored in the memory 11 of the opening control device 10. Further, the opening degree control device 10 calculates a change rate of the gas pressure or the air pressure detected by the pressure sensor with respect to the data at the time of the normal combustion, and stores the obtained value in the memory 11. 1
There is a determiner 13 that compares the value obtained in 2 with the set value to determine and output various abnormalities, and a display unit 15 that displays a sign of the abnormality or the like.

[0011] Figure 4 is a graph showing the relationship between the air pressure P _A and the load factor (X), FIG. 5 is a graph showing the relationship between the gas pressure P _G and the load factor (X). 4 shows a relationship between the load factor of the normal combustion (X) and the air pressure P _A (reference value)
S, excess air zone in relation to air pressure P _A and the load factor of when the air damper control motor or the fuel control valve control motor trouble CO occurrence takes place with (X) (abnormal limit) A1, CO generated in the low O ₂ region relationship (abnormal limit) A2, and air pressure P _a and the load factor during lowering wind pressure by blower trouble with air pressure P _a and the load factor in case of trouble of the air damper control motor or the fuel control valve control motor occurs (X) The relationship (abnormal limit) C with (X) is shown.

[0012] Figure 5 is the load factor during normal combustion (X) and the relationship between the gas pressure P _G (reference value) S, the excess air range CO generation is an air damper control motor or the fuel control valve controls the motor which occurs Gas pressure at trouble P
Relationship between _G and load factor (X) (abnormal limit) A1, gas pressure P _G and load factor (X) when trouble occurs in air damper control motor or fuel control valve control motor where CO is generated in low O ₂ range Relationship (abnormal limit) A2,
And relationships by gas-side trouble with gas pressure P _G at a gas supply pressure drop load factor and (X) is (abnormal limit) B are shown.

(1) Fuel control valve control motor (C
MG). 4, for example, P _A reference value Y (S line) becomes the change in the dotted line in the figure, when exceeding the abnormality limit line A1 or A2 leading to CO generation, the abnormal combustion. 5, for example, P _G reference value Z (S line) becomes the change in the dotted line in the figure, abnormality limit line leading to the CO generated A1 or A2
When exceeding, it is considered as abnormal combustion.

(2) Air damper control motor (C
Abbreviated as MA). 4, for example, P _A reference value Y (S line) is in the figure becomes a change on the solid line, the abnormality limit line A to reach the CO occurrence
When it exceeds 1 or A2, it is regarded as abnormal combustion. 5, for example, P _G reference value Z (S line) is in the figure becomes a change on the solid line, when in excess of abnormal limit line A1 or A2 leading to CO generation, the abnormal combustion.

(3) In the case of the mechanical linkage type burner shown in FIG. 2, the linkage mechanism is displaced. The above P _A reference value (S line) Y and P _G reference value for (S line) Z operate irregularly, respectively, by monitoring P _A, the amount of change each P _G, above (1),
Abnormal limit line A1 or A2 as in the case of (2)
If it exceeds, it is regarded as abnormal combustion.

(4) When the gas supply pressure drops due to a trouble on the gas side (gas supply pressure). For example, between a load factor 50-100%, to burn the abnormal if P _G value is equal to or less than B line in FIG.

(5) A case where the wind pressure drops due to a blower failure. For example, between a load factor 75% to 100%, to burn the abnormal if P _A value is equal to or less than C line in FIG. 4.

[0018]

According to the gas burner monitoring apparatus of the present invention, a gas boiler, a method of detecting pressure using a pressure sensor without using a sensor for analyzing O ₂ , CO, or the like in a combustion gas can be used. It monitors the combustion of gas burners for gas absorption chillers and hot water heaters, and performs normal combustion safely.
When there is an abnormality in the control motor, the blower, the gas supply, the mechanical linkage, and the like, it is possible to determine the type and degree of the abnormality, and to output a sign such as an inspection or abnormality. Since the gas burner monitoring device of the present invention is inexpensive and simple, it has high industrial utility value.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a combustion device used in the present invention.

FIG. 2 is an explanatory view of another combustion device used in the present invention.

FIG. 3 is an explanatory diagram of a system of a gas burner monitoring device of the present invention.

FIG. 4 is a graph showing a relationship between an air pressure and a load factor.

FIG. 5 is a graph showing the relationship between gas pressure and load factor.

[Explanation of symbols]

P _G gas pressure P _A air pressure X Load factor A1, A2 Abnormal limit line leading to CO generation S Relationship between load factor and gas pressure or air pressure during normal combustion B Abnormal limit due to gas side trouble C Abnormal limit due to blower trouble DESCRIPTION OF SYMBOLS 1, 1 'Burner main body 2 Blower 3 Air damper 4a, 4b, 4c Control motor 5 Fuel gas 6 Fuel control valve 7 Gas pressure sensor-8 Air pressure sensor-9 Mechanical linkage 10 Opening control device 11 Memory 12 Computing device 13 Judge 14 Load 15 Display

────────────────────────────────────────────────── (5) References JP-A-5-118531 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/18

Claims (2)

(57) [Claims] 1. A gas burner according to a gas pressure and an air pressure.
Monitoring equipment that monitors abnormalities in the load during normal combustion
Storage device that stores gas pressure and air pressure corresponding to the rate
And the detected gas pressure or air pressure during the normal combustion
Calculate the rate of change to the data and store the calculated value in the storage device.
And a value obtained by the arithmetic unit
Judgment to compare with set value to judge various abnormalities and output
A monitoring device for a gas burner, comprising: 2. A gas burner according to gas pressure and air pressure.
Monitoring equipment that monitors abnormalities in the load during normal combustion
Storage device that stores gas pressure and air pressure corresponding to the rate
And the detected gas pressure or air pressure during the normal combustion
Calculate the rate of change to the data and store the calculated value in the storage device.
An arithmetic unit that stores data in the
A monitoring device for a gas burner, characterized in that: