JPS59202056A - Automatic igniting method and apparatus for hydrogen flame in detector utilizing hydrogen flame - Google Patents

Abstract

PURPOSE:To perform the detection of a hydrogen flame and the ignition thereof by one member, by providing a platinum coil in the vicinity of a hydrogen flame forming position while reducing or stopping air introduction when the hydrogen flame is extinguished. CONSTITUTION:A gaseous mixture consisting of carrier gas and hydrogen is introduced into the detection chamber 12 of a detector 1 through a jet orifice 13 along with air 4 introduced through an introducing port 14 and ignited through a platinum coil 6. When a hydrogen flame is extinguished, hydrogen 3 and 4 are reacted on the surface of the platinum coil 6 by the catalytic action of said coil 6 to bring the platinum coil 6 to a red heat state and the resistance of said coil 6 is changed. This change is detected by a comparator 7 and the introduction of air 4 is reduced or stopped by closing a solenoid valve 9 to ignite the hydrogen flame 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for automatically igniting a hydrogen flame in a hydrogen flame detector.

Detectors using hydrogen flame include hydrogen flame ionization detector (
Thermal ion detectors (FTD), multiphotometric detectors (FPD), etc. are widely used for analyzing trace components. In these detectors, a carrier gas and hydrogen are mixed and ejected into the detector, and air is introduced into the detector to form a hydrogen flame. This hydrogen flame may disappear during detection due to various environmental changes. Extinguishing the hydrogen flame causes detection to be interrupted or to be restarted from the beginning.

Conventionally, methods and devices have been provided in which the extinguishment of a hydrogen flame is sensed using a heat sink, a temperature sensor, or the like, and the ignition coil is re-ignited by passing an electric current through it. According to this method, a sensor must be installed separately from the ignition coil to detect temperature changes caused by extinguishing the hydrogen flame, which results in a complicated structure and may reduce the detection function depending on the material. .

SUMMARY OF THE INVENTION In view of the conventional problems, it is an object of the present invention to provide a method and device that can both detect the extinguishment of a hydrogen flame and ignite the hydrogen flame with a single member.

An object of the present invention is to provide a method in which a carrier gas that has passed through a column and hydrogen are mixed and ejected into a detector, and air is introduced into the detector to form a hydrogen flame. By providing a method for automatically igniting a hydrogen flame in a hydrogen flame detector, which is characterized by providing a platinum coil near the flame formation position and reducing or stopping the introduction of air when the hydrogen flame is extinguished, the present invention also provides an apparatus. In a detector that mixes carrier gas and hydrogen that have passed through a column and blows the mixture into the detector, and introduces air into the detector to form a hydrogen flame, platinum is placed near the location where the hydrogen flame is formed. An automatic hydrogen flame ignition device in a detector using a hydrogen flame, in which a coil is provided and the platinum coil is connected to a solenoid valve provided in the air introduction pipe via a comparator that compares the change in resistance value of the platinum coil. This is achieved by providing

Embodiments of the present invention will be described in detail below with reference to the drawings.

The detector l includes an enclosed detection chamber 1 equipped with an outlet 11.
2, and this detection chamber 12 has an ejection port 1 for ejecting a mixed gas of carrier gas 2 and hydrogen 3 into the detection chamber 12.
3 and an inlet 14 for introducing air 4 are in communication with each other.

Further, above the spout 13, a collector 15 is provided which is connected to an electrometer recorder.

The hydrogen flame 5 is formed above the spout 13, and conventionally it was ignited by an ignition coil such as a nichrome wire installed near the formation position of the hydrogen flame 5. However, in the present invention, platinum wire is used as the ignition coil. Coil 6 is used. Because the platinum coil 6 acts as a catalyst when the hydrogen flame 5 is extinguished due to the nature of platinum, the hydrogen 3 and air (oxygen) 4 react on its surface to generate reaction heat and become red hot. Therefore, air (oxygen)
4 is reduced or stopped, the hydrogen flame 5 is automatically ignited. Therefore, the extinguishing detection and ignition of the hydrogen flame 5 can be performed by a single member, the platinum coil 6.

In the case of extinguishing the hydrogen flame 5 during detection, as described above, the above-mentioned effect cannot be expected at the beginning of detection, so either heat the platinum coil 6 by passing an electric current through it, or
Air 4 is heated and introduced in advance, and the interview carrier gas 2
A hydrogen flame 5 is ignited by blowing out a mixed gas of hydrogen and hydrogen 3 and reducing or stopping the introduction of air 4.

The device used to carry out this ignition method is a platinum coil 6
On the other hand, a comparator 7 is connected to compare the change in resistance value.
Attach an electromagnetic goggle 9 to the middle of the air 4 inlet pipe 8, and connect the comparator 7.
and electromagnetic, fF'9 are connected. The red heat of the platinum coil 6 when the hydrogen flame 5 is extinguished causes a change in resistance, so the comparator 7 detects this change and closes the solenoid valve 9 to reduce or stop the introduction of air 4. ignite the hydrogen flame 5. When the hydrogen flame 5 ignites, the resistance value of the platinum coil 6 also changes, so the comparator 7 captures this change and the solenoid valve 9
to open.

According to this device, since the change in the resistance value of the platinum coil 6 and the solenoid valve 9 are electrically linked via the comparator 7, extinguishment of the hydrogen flame 5 can be quickly detected and re-ignited. can.

As described above, according to the present invention, both the detection of extinguishing of the hydrogen flame and the ignition of the hydrogen flame are performed by one member, thereby simplifying the structure and preventing deterioration of the detection function. It has the effect of

[Brief explanation of drawings]

The drawings are explanatory diagrams of embodiments of the present invention. ■...Detector 11...Exhaust port 12...Detection chamber 13 Threat / Spout 14...Inlet 21.Carrier gas 3...Hydrogen 4.Fist air 5.Fist hydrogen flame 6. Kenji Platinum Coil 7... Comparator 8...Introduction pipe 9... Solenoid valve Patent applicant: Gascro Industries Co., Ltd.

Claims (1)

[Claims] 1. In a detector in which a carrier gas that has passed through a column and hydrogen are mixed and ejected into the detector, and air is introduced into the detector to form a hydrogen flame. A method for automatically igniting a hydrogen flame in a hydrogen flame detector, characterized in that a platinum coil is provided near the formation position and the introduction of air is reduced or stopped when the hydrogen flame is extinguished. 2. In a detector that mixes the carrier gas that has passed through the column and hydrogen and blows it out into the detector, and also introduces air into the detector to form a hydrogen flame, platinum is placed near the location where the hydrogen flame is formed. An automatic hydrogen flame ignition device in a detector using a hydrogen flame, in which a coil is provided and the platinum coil is connected to a solenoid valve provided in the air introduction pipe via a comparator that compares the change in resistance value of the platinum coil. .