JPH08189634A - Safety device for combustor - Google Patents

Abstract

PURPOSE: To provide a safety device of a combustor having a catalyst layer which allows detecting of aging of the catalyst layer accurately. CONSTITUTION: A catalyst temperature sensor 4 is provided to detect the temperature of a catalyst of a combustor having a catalyst layer. A combustion controller 2 is provided to generate an alarm receiving a signal from the catalyst temperature sensor 4 and an auxiliary power source 3 to supply a power source to the combustion controller 2 during the non-conduction period of a commercial power source. The combustion controller 2 has a memory section 2A to store a signal data as reference data from the catalyst temperature sensor 4 as obtained when a combustion is made by the combustor in a standard state previously during the shipment from a factory. Thus, a data of a signal from the catalyst temperature sensor 4 in the using of the combustor is compared with the reference data to generate an alarm with the combustion controller 2. This enables the preventing of the continuation of abnormal combustion attributed to aging of the catalyst layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a combustor provided with a catalyst layer.

[0002]

2. Description of the Related Art Conventionally, a combustor provided with this type of catalyst layer is disclosed in, for example, Japanese Patent Laid-Open No. 4-278103. This combustor includes a fuel tank, a fuel supply pump for supplying the fuel in the fuel tank to the vaporization chamber, and a blower fan for supplying air to the vaporization chamber, and a downstream side of the vaporization chamber. A primary combustion unit is provided, an ignition device is provided in the vicinity thereof, and a downstream side of the primary combustion unit is
A secondary combustion section having a catalyst layer is provided and is configured to communicate with the exhaust port. When the fuel is mixed with air in the vaporization chamber and flows into the primary combustion section and is ignited by the ignition device to form a flame, the high temperature combustion gas causes the catalyst layer to reach a temperature suitable for catalytic combustion. Then, the fuel supply pump is stopped and the flame in the primary combustion section is extinguished. Then, when the fuel supply pump is operated again to supply the fuel to the vaporization chamber, no flame is formed in the primary combustion part and the mixed gas flows into the catalyst layer as it is, catalytic combustion is started, and reaction heat is generated. At the same time, it produces carbon dioxide and water. The catalyst layer of the above-mentioned combustor usually has a two-layer structure of a main catalyst layer and an auxiliary catalyst layer in order to prevent the release of carbon monoxide and hydrocarbons due to incomplete combustion. As such a catalyst layer, for example, a honeycomb-shaped body made of a metal net such as stainless steel is coated with ceramics such as alumina, and a catalyst metal such as a platinum group element is supported on the ceramic layer, or a ceramic fiber Braided bodies are used.

In the above-mentioned combustor, the catalyst layer is exposed to a high temperature during catalyst combustion, so that thermal deterioration is unavoidable, and the catalytic activity decreases with the lapse of time, and carbon monoxide and hydrocarbons are easily generated. . Further, since the catalyst layer is a ceramic layer on which a catalytic metal is carried, etc., if the ceramic layer is damaged, the catalyst is lost at this location and uniform catalytic combustion cannot be obtained. When the catalyst activity is lowered or the catalyst layer is damaged in this way, the temperature of the catalyst layer is lowered because sufficient catalyst combustion is not performed. Therefore, conventionally, the temperature at the time of complete combustion of the catalyst layer is assumed, a catalyst temperature sensor is provided in the catalyst layer to detect the temperature of the catalyst layer as signal data, and the temperature is out of the allowable range compared with the assumed temperature. In this case, a safety device that determines that the catalyst layer is abnormal and issues an alarm or stops combustion is used to prevent excessive incomplete combustion due to deterioration of the catalyst function.

[0004]

In the above-mentioned conventional safety device for a combustor having a catalyst layer, the temperature at the time of combustion of the catalyst layer is compared with a previously assumed reference temperature. The combustion temperature varies, and the catalyst temperature sensor also has an error. Therefore, in the combustor in which the catalyst layer and the catalyst temperature sensor having these respective errors are combined, if the abnormality of the catalyst layer due to the change with time is determined by comparison with the assumed reference temperature, the determination cannot be made. It is easy to be accurate, and the safety device operates because it is judged to be abnormal even if the catalyst function of the catalyst layer is normal, or the safety device does not operate even if there is an abnormality in the catalyst function of the catalyst layer. However, there was a problem that the combustion was continued.

In view of the above problems, it is an object of the present invention to provide a combustor safety device provided with a catalyst layer capable of accurately detecting deterioration of the catalyst layer over time.

[0006]

According to a first aspect of the present invention, there is provided a combustor safety device which detects a catalyst temperature of a combustor having a catalyst layer and a signal from the catalyst temperature sensor. A combustion control device for performing alarm control and control such as combustion stop, and an auxiliary power supply that supplies power to the combustion control device when the main power supply is not conducted. Has a storage unit for storing the signal data from the catalyst temperature sensor when burning in a state as standard data, comparing the signal data from the catalyst temperature sensor when the combustor is used with the standard data When the difference exceeds the set allowable value, the combustion control device is configured to issue an alarm and stop combustion.

According to a second aspect of the present invention, there is provided a combustor safety device in which the combustion control device is configured so that combustion is not started when standard data is not stored in the storage unit when the combustor is used. is there.

[0008]

According to the structure of claim 1, each combustor is burned in a standard state in advance in an initial state such as factory shipment, and the data from the catalyst temperature sensor at this time is stored as standard data in the storage section. When the catalyst temperature sensor is actually used, the signal data from the catalyst temperature sensor is compared with the standard data, and if the difference between both data exceeds the set allowable value, an alarm is generated, combustion is stopped, and abnormal combustion continues. Can be prevented. Since the target of comparison of the temperature of the catalyst layer at the time of combustion is the temperature of the catalyst layer at the time of combustion in the initial state such as at the time of factory shipment by each combustor, it corresponds to the difference in the catalyst combustion temperature by each combustor. The deterioration with time of the catalyst can be accurately detected.

Further, according to the second aspect of the present invention, the combustion control device is configured so as not to start combustion when the storage unit does not store standard data when the combustor is used. It is possible to easily discriminate when the standard data needs to be set, and it is possible to prevent a malfunction when the standard data is not set.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustor safety device according to a first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an electrical configuration of a safety device for a combustor. In the figure, reference numeral 1 denotes a power supply unit including a power supply plug 1A connected to a commercial power supply, which supplies an AC voltage of 100V AC to a combustion control device 2 provided in a combustor. The combustion control device 2 has a storage unit 2A including a readable / writable RAM that stores a program for executing a predetermined control sequence in advance and stores various data.
And a standard data forming a microprocessor (not shown).
The data storage unit and the combustion control unit, and the input / output unit. Reference numeral 3 is an auxiliary power source as a power source backup means for holding the stored contents of the storage unit 2A when the commercial power source is not conducted, and supplies a predetermined power source to the combustion control device 2 when the AC power source from the commercial power source is cut off. . On the input port side of the combustion control device 2, a catalyst temperature sensor 4 for detecting the temperature of a catalyst layer forming a combustor (not shown), and a plurality of switches for operating room temperature setting and time setting in addition to the operation switch 5A. A switch input section 5 having a switch and a changeover switch 6 for switching the combustion control device 2 between the standard data storage means side and the combustion control means side (actual use side) are connected. On the other hand, on the output port side of the combustion control device 2, a display unit 7 for displaying an operating state, an abnormal state, etc., and an alarm generation unit 8 including a sounding body such as a buzzer are connected. All the components except the power plug 1A are incorporated in the main body 9 of the combustor.

The functional configuration of the safety device in the above embodiment will be described with reference to the block diagram shown in FIG. The data of the catalyst temperature sensor 4 attached to the catalyst layer 22 is output to the combustion control device 2. Further, the combustion control device 2 includes standard data storage means 21A and combustion control means 21B, and the changeover switch 6 can switch between the standard data storage means 21A (A side) and the combustion control means 21B (B side). . The standard data storage means 21A stores the catalyst combustion temperature data of the catalyst layer 22 at the time of shipment output from the catalyst temperature sensor 4 in the storage portion 2A, and the combustion control means 21B operates from the switch input portion 5. Based on the signal, the operation of starting combustion and extinguishing / stopping the combustion of the combustor 23 is controlled, and the storage unit 2
Based on the standard data stored in A and the data sent from the catalyst temperature sensor 4 in actual use, if the absolute value of the difference between the two exceeds the set allowable value, an alarm generating means is issued.
The alarm generator 8 is activated by 24. Although not shown, in the present embodiment, the combustion control means 21B is configured to prevent combustion when standard data is not stored in the storage unit 2A.

Next, the operation of the safety device having the above structure will be described with reference to the flowchart of FIG. First, the factory shipment will be described. When the operation switch 5A of the switch input unit 5 is turned on in step S1,
In step S2, it is determined whether the combustion control device 2 is on the standard data storage means 21A side (A side) or the combustion control means 21B side (B side). In addition, at the time of factory shipment,
The changeover switch 6 is set in advance to the standard data storage means 21A side (A side). When it is determined in step S2 that the combustion control device 2 is on the standard data storage means 21A side, combustion is started in the next step S3, the catalyst temperature sensor 4 detects the temperature of the catalyst layer 22, and in step S4 this standard The data of the catalyst temperature sensor 4 is stored in the storage unit 2A by the data storage unit 21A. Then, the process proceeds to step S8, and while continuing the combustion control, step S1
Returning to the procedure, the operation switch 5A of the switch input unit 5 is turned off to perform the fire extinguishing / stop processing in step S10.
In this way, each combustor 23 is shipped from the factory (initial state)
The temperature data (standard data) of the catalyst layer 22 at the time of combustion in the standard state are stored in the storage unit 2A in advance. Then, when the storage of the standard data is completed, the changeover switch 6 sets the combustion control device 2 to the combustion control means 21B side (B side).

Next, the actual use will be described. In step S1, when the operation switch 5A of the switch input unit 5 is turned on, the process proceeds to step S2, and the changeover switch 6 is on the standard data storage means 21A side (A side) or not (combustion control means 21B side ( It is on the B side)).
Since the combustion control device 2 is switched to the combustion control means 21B by the changeover switch 6 as described above, it is determined that it is on the combustion control means 21B side (B side). Then, in the next step S5, it is determined whether or not standard data is input to the storage unit 2A. When it is determined that the standard data is input to the storage unit 2A, the combustion is started in the next step S6, the catalyst temperature sensor 4 detects the temperature of the catalyst layer 22, and transmits it to the combustion control means 21B. Then, in step S7, the catalyst temperature data is compared with the standard data stored in the storage unit 2A in step S4, and it is determined whether or not the absolute value of the difference between the two data is equal to or more than a predetermined value (α). judge. If the absolute value of the difference between the two data is less than the predetermined value (α) in step S7, it is determined that there is no abnormality in the catalyst function of the catalyst layer 22 and step S8 is performed.
And the combustion control is continued. When the combustion is continued for a desired time, the procedure returns to step S1 and the operation switch 5A of the switch input section is turned off to perform step S10.
The combustor 23 is extinguished and stopped. On the other hand, if the absolute value of the difference between the two data is equal to or greater than the predetermined value (α) in step S7, it is determined that the catalyst function of the catalyst layer 22 is abnormal, and the process proceeds to step S9, where the catalyst layer 22 is abnormal. An alarm for warning is generated by the alarm generation unit 8, the procedure returns to step S1, the operation switch 5A of the switch input unit 5 is turned off to extinguish / stop at step S10, and the alarm is cleared at this time. In this embodiment, in step S7, it is determined whether the difference between the catalyst temperature data and the standard data is greater than or equal to a predetermined value (α) or less, but the difference between the two data is less than or equal to the predetermined value (α). Similar effects can be obtained by determining whether or not it is exceeded.

As described above, the temperature of the catalyst layer 22 when the combustor 23 is burned in the standard state in the initial state such as at the time of factory shipment is stored in the storage section 2A in advance by the standard data storage means 21A. Since the actual measurement value for each combustor 23 is used as standard data and compared with the temperature data of the catalyst layer 22 in actual use, the error of the catalyst temperature sensor 4 and each catalyst layer
It is possible to accurately determine whether the catalyst function is normal or abnormal without being affected by the variation in combustion temperature due to 22, and to prevent abnormal combustion from continuing.

If the user forgets to enter the standard data into the storage unit 2A at the time of factory shipment as described above, step S5
In, the combustion control means 21B determines that the standard data is not input to the storage unit 2A, and the procedure returns from step S5 to step S1. Therefore, it is possible to easily determine whether or not the standard data needs to be set. It is possible to prevent combustion in the state where standard data is not set.

As described above, according to the above embodiment, the catalyst layer
A catalyst temperature sensor 4 for detecting the catalyst temperature of a combustor 23 provided with 22, a combustion control device 2 for receiving an alarm from a signal from the catalyst temperature sensor 4, and a commercial power source for the combustion control device 2 as a main power source. The combustion control device 2 includes standard data of signal data from the catalyst temperature sensor 4 when the combustor is burned in a standard state at the time of factory shipment in advance. When the combustor is in use, the signal data from the catalyst temperature sensor 4 is compared with the standard data when the combustor is used, and when the difference between the two data exceeds a set allowable value (α). Since the combustion control device 2 is configured to generate an alarm, it is possible to prevent abnormal combustion from continuing due to deterioration of the catalyst layer 22 with time. Further, since the comparison target of the temperature of the catalyst layer 22 at the time of catalytic combustion is the temperature of the catalyst layer 22 at the time of combustion in the initial state such as factory shipment by each combustor, the catalyst layer 22 of each combustor The deterioration with time of the catalyst can be accurately detected in accordance with the catalyst combustion temperature. In particular, in this embodiment, when the standard data is not stored in the storage unit 2A when the combustion control device 2 is used, the combustion control means 21B is configured so that the combustion control device 2 does not start combustion. Therefore, it is possible to easily discriminate when the standard data needs to be set and prevent malfunction.

Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, in the block diagram shown in FIG. 3, forced extinguishing / stopping processing can be added downstream of the alarm generation processing.
In some cases, only the fire extinguishing / stopping process may be provided instead of the alarm issuing process.

[0018]

The safety device for a combustor according to claim 1 of the present invention is a catalyst temperature sensor for detecting the catalyst temperature of a combustor provided with a catalyst layer, and an alarm is generated in response to a signal from the catalyst temperature sensor. A combustion control device that controls combustion stop and the like, and an auxiliary power supply that supplies power to the combustion control device when the main power supply is not conducting, the combustion control device burns the combustor in a standard state in advance. Has a storage unit for storing the signal data from the catalyst temperature sensor as standard data when the combustor is used, and compares the signal data from the catalyst temperature sensor when using the combustor with the standard data to set the difference between the two data. When the specified allowable value is exceeded, an alarm is generated and combustion is stopped by the combustion control device, and abnormal combustion is prevented from continuing by issuing an alarm and stopping combustion. It can be. Since the target of comparison of the temperature of the catalyst layer at the time of combustion is the temperature of the catalyst layer at the time of combustion in the initial state such as at the time of factory shipment by each combustor, it corresponds to the difference in the catalyst combustion temperature by each combustor. The deterioration with time of the catalyst can be accurately detected.

Further, in the combustor safety device according to a second aspect of the present invention, the combustion control device is configured so that combustion is not started when standard data is not stored in the storage unit when the combustor is used. Therefore, it is possible to easily discriminate when the standard data is required to be set, and it is possible to prevent a malfunction when the standard data is not set.

[Brief description of drawings]

FIG. 1 is a block diagram showing a safety device for a combustor according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a functional configuration of the safety device of the first embodiment.

FIG. 3 is a flowchart showing a processing procedure of the safety device according to the first embodiment.

[Explanation of symbols]

 1 Power Supply Section 2 Combustion Control Device 2A Storage Section 3 Auxiliary Power Supply 4 Catalyst Temperature Sensor 8 Alarm Generation Section 21A Standard Data Storage Means 21B Combustion Control Means 22 Catalyst Layer 23 Combustor

Claims (2)

[Claims] 1. A catalyst temperature sensor for detecting a catalyst temperature of a combustor having a catalyst layer, a combustion control device for receiving a signal from the catalyst temperature sensor to control an alarm and a combustion stop, and the combustion. The control device is provided with an auxiliary power supply that supplies power when the main power supply is off, and the combustion control device uses signal data from the catalyst temperature sensor when the combustor is burned in a standard state in advance as standard data. When the combustor is used, the signal data from the catalyst temperature sensor is compared with the standard data when the combustor is used, and when the difference between the two data exceeds a set allowable value, an alarm is issued by the combustion control device. A combustor safety device characterized by being configured to generate and stop combustion. 2. The combustor according to claim 1, wherein the combustion control device is configured not to start combustion when standard data is not stored in the storage unit when the combustor is used. Safety device.