JPH0525159U - Combustor ignition and flame detection device - Google Patents

Abstract

(57) [Summary] (Modified) [Constitution] In the ignition and flame detection device of the radial type small capacity combustor, a thermocouple 6 with a metal protection tube is provided, and the thermocouple 6
Nozzle made of metal for blowing out and burning fuel on the sensing part of
To detect a flame and to apply a high voltage between the protection tube and the nozzle to generate a spark and ignite the fuel. [Effect] A thermocouple with a sheath is provided to monitor the combustion state, a high-voltage spark ignition system is adopted, and the metal sheath and metal fuel nozzle described above are used as its electrodes. Therefore, the device is extremely simple and compact, and can be applied to a small combustor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor used in an industrial heating device, and more particularly to an ignition device and a flame detection device for a radial small capacity combustor generally called a cup burner or a radiant burner.

[0002]

[Prior Art]

 As a method of igniting the combustor used in the industrial heating device, the pilot fire is manually approached to the combustor nozzle, or the pilot burner is burned near the nozzle as the pilot fire and the fuel is blown out from the nozzle automatically. There are methods such as ignition, or a method in which the electric spark generator is activated and ignited in conjunction with the operation of the fuel valve. Recently, the automation of the device operation has been widely used in all industrial fields, but the latter two methods among the above ignition methods can also correspond to the automation of the combustion operation.

In the case of automation, it is extremely safe for the combustor to confirm ignition and monitor the combustion state after ignition, as well as performing ignition easily and surely. is important. There are various types of flame detectors or temperature detectors other than visual inspection, and in the case of slightly larger combustors, these detectors are installed and their output is displayed or It controls the fuel supply based on the output to measure the driving safety. However, in the radial small-capacity combustor as mentioned at the beginning, it has a special structure containing refractory and its small size significantly restricts the space for installing auxiliary equipment. As a result, the requirements for automation and safety as described above are not fully satisfied.

[0004]

[Problems to be solved by the device]

 Therefore, the present invention aims to provide a small ignition device and a flame detection device with a simple structure that can be mounted on a small radial combustor.

[0005]

[Technical means]

 In the present invention, as a combustion monitoring device for ensuring safety, a thermocouple with a metal protective tube (sheath) is used to detect the flame temperature, and as an ignition device, a high-voltage electric spark system is used. The sheath and combustor nozzle are used as both electrodes for generating sparks.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the figure, a combustor 1 has a refractory block 3 having a cup-shaped inner surface housed in a casing 2, and a fuel nozzle 4 is provided at the center of the cup bottom of the refractory block 3 for supplying fuel. Fuel is supplied through the pipe 5. The fuel supply is controlled by a fuel valve (not shown). A thermocouple 6 with a metal protective tube (sheath) penetrates through the casing 2 and the fireproof block 3, and its sensing part projects slightly from the fireproof block, leaving a gap of several millimeters between the nozzle and the nozzle. The end of the sheath opposite to the sensing section extends to the outside of the casing. An insulating material 7 is inserted between the sheath of the thermocouple and the casing 2 to electrically insulate them from each other. A high voltage ignition transformer 8 is provided outside the casing. One terminal of the transformer is connected to the sheath of the thermocouple and the other terminal is connected to the fuel supply pipe.

To ignite the combustor, when the fuel valve is opened and fuel is flown through the nozzle 4 and at the same time the high-pressure transformer 8 is operated, sparks are generated in the above-mentioned gap between the sheath and the nozzle, and the fuel is burned. Is ignited. When combustion starts, the flame temperature is detected by the thermocouple, and when the detected temperature reaches the specified limit temperature, the operation of the high-voltage transformer is stopped.If the temperature remains below the limit temperature for a certain period of time, the fuel valve is turned off. Operations such as closing are performed. Thus, even if the ignition fails or the flame goes out for some reason, it is possible to prevent the dangerous situation where the fuel is still blown out.

[0008]

[Effect of the device]

 As described above, in the present invention, a thermocouple with a sheath is provided to monitor the combustion state, and a high-voltage spark ignition system is adopted. Since the fuel nozzle is used, the device is remarkably simple and small, and can be applied to the small combustor as mentioned at the beginning.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

 1 Combustor 2 Casing 3 Fireproof Block 4 Nozzle 5 Fuel Supply Pipe 6 Thermocouple 7 Insulation Material 8 High Voltage Transformer

Claims (1)

[Scope of utility model registration request] 1. A radiation type small-capacity combustor ignition and flame detection device, wherein a thermocouple with a metal protective tube is provided, and a sensing section of the thermocouple is provided in the vicinity of a metal nozzle for blowing and burning fuel. A device that is positioned to detect a flame, and applies a high voltage between the protection tube and the nozzle to generate a spark and ignite fuel.