Fireproof and blockage-proof structure for FID (flame ionization detector) combustion chamber

Abstract

The invention discloses a fireproof and anti-blocking structure of a combustion chamber of a hydrogen flame ionization detector, which comprises a combustion chamber gas inlet, a hydrogen gas inlet and a sampling gas inlet; a combustion chamber, which also includes a combustion chamber base and a cavity; an ignition system, which also includes thermocouples and ignition coils; and combustion chamber gas vents; also includes fireproof and anti-blocking structures. The fire-proof structure includes the fire-proof structure body and the fire-blocking sheet. The fire-blocking sheet is a mesh ventilation sheet installed on the main channel of the combustion chamber gas discharge port; the anti-blocking structure includes the anti-blocking structure body and the bypass of the combustion chamber gas discharge port The channel, the bypass channel of the gas discharge port of the combustion chamber is to increase N through holes on the side of the main channel of the gas discharge port of the combustion chamber, preferably N is taken from 2-4. The invention is simple in structure and easy to use, ensures that the FID combustion chamber can fully burn without extinguishing the flame, and at the same time isolates the communication between the flame and the outside world, prevents the flame from escaping from the combustion chamber, and avoids safety problems such as fire and explosion.

Description

technical field [0001] The invention relates to a hydrogen flame ionization detector, in particular to a fireproof and anti-blocking structure in the combustion chamber of the hydrogen flame ionization detector used in gas chromatography detection. Background technique [0002] Gas chromatographs are widely used in petroleum and petrochemical analysis, environmental analysis, food analysis, pharmaceutical and clinical analysis, among which hydrogen flame ionization detector (referred to as FID) is the most common detector in gas chromatograph. Working principle: The flame generated by the combustion of hydrogen and air is used as energy source. When the organic compound enters the flame burned by hydrogen and oxygen, chemical ionization is generated at high temperature, and the ionization generates ions. An electrical signal proportional to the amount of organic compounds entering the flame, so organic matter can be quantitatively analyzed based on the magnitude of the elect...

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Problems solved by technology

[0003] However, at present, the outlet of the FID structure combustion chamber is open. Because there is a hidden danger of flammable gas leakage in the place where the FID is used, it is possible that the flammable gas leaked from the outside enters the FID combustion chamber or the combustion flame of the combustion chamber escapes from the combustion...

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