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

Abstract

The invention discloses a fireproof and blockage-proof structure for an FID (flame ionization detector) combustion chamber. The fireproof and blockage-proof structure comprises a gas inlet of the combustion chamber, a hydrogen inlet, a sampling gas inlet, a combustion chamber, an ignition system, a gas exhaust port of the combustion chamber, a fireproof structure and a blockage-proof structure, wherein the combustion chamber comprises a combustion chamber base and a combustion chamber cavity; the ignition system comprises a thermocouple and an ignition coil; the fireproof structure comprises a fireproof structure body and a fire blocking sheet, and the fire blocking sheet is a net-shaped air ventilating sheet, and is arranged on a main passage of the gas exhaust port of the combustion chamber; the blockage-proof structure comprises a blockage-proof structure body and a bypass passage of the gas exhaust port of the combustion chamber, N through holes are additionally formed in the surrounding side surfaces of the main passage of the gas exhaust port of the combustion chamber by the bypass passage of the gas exhaust port of the combustion chamber, and N is preferably 2 to 4. The fireproof and blockage-proof structure has the advantages that the structure is simple, the convenience in use is realized, the sufficient combustion in the FID combustion chamber without fire extinguishing is guaranteed, the communication of flame and outside is isolated, the flame is prevented from escaping out of the combustion chamber, and the safety problems of fire and explosion and the like are avoided.

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 chamber. Cause fire and explosion, so such a structure has potential safety hazards in some relatively harsh on-site environments

[0004] In addition, the gas discharge port of the combustion chamber generally has only one channel. This design makes the FID combustion chamber flame-out and unable to work if the gas outlet of the combustion chamber is blocked.

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