CN111435127A

CN111435127A - Online analysis system for organic matters in air

Info

Publication number: CN111435127A
Application number: CN201910732614.1A
Authority: CN
Inventors: 朱晓红; 李玉株; 张垒
Original assignee: Beijing Gospeak Technology Co ltd
Current assignee: Beijing Gospeak Technology Co ltd
Priority date: 2019-08-10
Filing date: 2019-08-10
Publication date: 2020-07-21

Abstract

An on-line analysis system for organic matters in air. A novel online analysis system for organic matters in air adopts a low-temperature (-120 ℃ -normal temperature) external heat exchange refrigeration three-way thermal desorption (two-way sampling and one-way cold focusing) system, a shunt/non-shunt sample introduction three-way chromatographic column (one-way pre-column and two-way chromatographic columns with different properties) and a dual ion/photon detector (self-adaptive large-span concentration switching) as a main analysis system, and uses a direct sample introduction multi-point calibration (same experiment calibration method) and a sampling tube sample introduction quality control calibration system to carry out full analysis on organic volatile/semi-volatile organic matters in air.

Description

Online analysis system for organic matters in air

The technical field is as follows:

on-line analysis of volatile and semi-volatile organic compounds in air

Background art:

1. the existing online analysis system for organic matters in air mainly comprises two types: in a laboratory analysis system and an online analysis system, under the background of considering low concentration sensitivity and high concentration span, the existing equipment usually adopts a plurality of calibration curves, the analysis process and the calibration process are very complicated, the operation difficulty of an instrument is high, and the requirement of the technical level of personnel is high;

2. the laboratory analysis system depends on a liquid nitrogen or electronic refrigeration thermal desorption system as a sampling system, and a laboratory chromatogram/mass spectrum is an analyzer, so that according to an EPA analysis method, the analysis cost is high, the requirement on laboratory conditions is high, the capacity of analyzing a sample in real time is not realized, the laboratory analysis can be performed only after on-site sampling, the data quality control is good, and the data result has no wide statistical significance;

3. the online analysis system adopts a normal-temperature thermal desorption sampling system, takes a gas chromatograph as an analyzer, has low analysis cost, has real-time sample analysis capability, and adopts a relative response coefficient (the value is an empirical value) to carry out data calibration, so that the data accuracy and the repeatability are poor, the current online analysis system with reliable mainstream mainly takes import as a main part, and the sampling calibration system of domestic equipment is not reliable enough (the main reason is that the error introduced by the system is uncontrollable);

4. the online analysis system respectively realizes the full analysis of organic matters in the air by adopting a plurality of devices, and generally cannot realize the purpose of sampling to cover all time periods of the whole day.

The invention content is as follows:

the purpose of the invention is as follows:

the technical advantages of experimental equipment and an online analyzer are combined, and the defects that a laboratory system cannot analyze in real time and has large influence on external environment change are overcome; the defects of poor data repeatability and poor reliability of an online system sampling system are overcome; the problem that a domestic equipment calibration system is unreasonable is solved, and in addition, the detector adopts an independent design structure and a digital acquisition system, so that the low-concentration sensitivity can be kept, and the large-span concentration can be self-adapted. Based on the characteristics, the special online total analysis system for the organic matters in the air is designed. The system has good data reliability and is all-weather in sampling. Through calibration and compensation, the system is small in interference factor from the outside, large in analysis concentration span, and the whole calibration scheme and quality control are closer to the actual external condition.

The implementation process comprises the following steps:

a calibration system which adopts a low-temperature (-120-normal temperature) external heat exchange refrigeration three-way thermal desorption (two-way sampling and one-way cold focusing) system, a split/non-split sample injection three-way chromatographic column (one-way pre-column and two-way chromatographic columns with different properties) and a dual ion/photon detector (self-adaptive large-span concentration switching) as a main analysis system, and adopts direct sample injection multi-point calibration (the same experiment calibration method) and sample injection quality control of a sampling tube. And carrying out total analysis on organic volatile/semi-volatile organic compounds in the air.

The implementation process embodies the technical characteristics:

1. external heat exchange cooling mode: the refrigeration equipment with different power is replaced according to the boiling point range of the specific analysis substance, so that the requirement of large-span condensation is met.

2. Bipolar thermal desorption cold focusing mode: the method can adopt large-flow sampling to improve the detection limit of the system, and simultaneously adopts a two-stage cold trap focusing mode to make the peak shape narrower and the separation effect better.

3. Split/no split sample introduction bipolar chromatography: the requirement of the sample introduction process on a transmission system can be reduced, the packed column and the capillary column can be used simultaneously in the separation process, and the gas full analysis process is realized by one-time sample introduction.

4. Constant-current chromatographic gas supplementing system: the flow of the corresponding chromatographic column of the double-ion detector system is ensured to be constant, and the base line is stable.

5. Multi-point calibration curve (same laboratory analysis system) and sampling tube sample injection quality control: the multipoint calibration curve is the same as a laboratory analysis method system, so that independent multipoint calibration of each substance is ensured; the sampling tube realizes sampling quality control to eliminate system errors generated by a sampling system. The calibration process can realize a dual quality control mode of curve quality control and sampling compensation quality control.

6. Large-span adaptive ion detector: the method has more comprehensive adaptability to special high-concentration pollutants in a special pollution area and other low-concentration symbiotic states, and ensures stable and reliable data.

The invention has the following effects:

1. the analysis system can be adapted to ambient air analysis under different external conditions. For example, the detection limit of malodorous substances (ammonia nitrogen substances, sulfur and phosphorus substances) can be improved by using a dual-channel photon detector with specific wavelength, through the qualitative and quantitative analysis of 108 substances in atmospheric environment air (PAMS, TO-14, TO-15, 13 aldehyde ketone compounds and ethanol) and the qualitative and quantitative analysis of volatile and semi-volatile organic substances in the working environment air with special requirements (national occupational health standard- -determination of toxic substances in the air of workplaces);

2. the analysis system has almost no consumables, so that the purchase and use cost is greatly reduced, the automatic operation of the calibration process and quality control is realized, the automatic system evaluation and calibration curve correction are realized, and only regular inspection is needed;

3. the analysis system adopts all-weather sampling analysis, the whole time period is covered in the calibration process, a more reasonable calibration and quality control mode is adopted, and the quality control can be inserted in the analysis process without influencing the sampling analysis process. The method can effectively reduce the system error, improve the accuracy and improve the statistical significance of data.

FIG. 1 is a schematic view of the installation of the present invention

FIG. 2 is a schematic diagram of the system control process and gas circuit connection of the present invention

FIG. 3 illustrates a large span adaptive ion detector configuration of the present invention

FIG. 4 characteristic wavelength dual channel photon detector structure of the invention

In fig. 1: gas circuit connection (fig. 1-a); a sampling pump circulating pump sampling channel (figure 1-A-1); a sampler sampling channel (FIG. 1-A-2); calibrator control channel (FIG. 1-A-3); a refrigerant gas channel (FIGS. 1-A-4); a sample introduction channel (FIG. 1-A-5); analyzer auxiliary gas channels (fig. 1-a-6); a dehumidification zero air channel (fig. 1-a-7); a pump exhaust discharge passage (fig. 1-a-8); a dry gas reverse osmosis channel (fig. 1-a-9); analyzer carrier gas channel (fig. 1-a-10); the sampling instrument gas switching gas channel (fig. 1-a-11); a calibrator calibration channel (FIGS. 1-A-12); sampling reverse osmosis dehumidification tube (figure 1-B); sample gas inlet (FIG. 1-B-1); a sample gas dehumidification outlet (FIG. 1-B-2); a dry air restricted inlet (fig. 1-B-3); dry gas vent (FIG. 1-B-4); a sampling tube quality control gas inlet (figure 1-C); station houses or explosion-proof cabins (fig. 1-S); station room air conditioning system (FIG. 1-H/C); a cylinder of carrier gas (FIG. 1-T); a calibrator (FIG. 1-1, same as FIG. 2-C); a sampler (figure 1-2, same as figure 2-A); an analyzer (FIGS. 1-3, same as FIG. 2-B); zero air hydrocarbon and water removal (FIGS. 1-4); refrigeration equipment (fig. 1-5); a data analysis system (FIGS. 1-6); a cabinet (FIGS. 1-7); a switch/router (FIGS. 1-8); GPRS/4G/5G wireless data transmission (FIGS. 1-9); sampling tube gas circulation pumps (fig. 1-10); a constant temperature sampling tube (FIGS. 1-11); hydrogen generator (figures 1-12)

The system comprises a gas path detail of a sampler (figure 2-A), a gas path detail of an analyzer (figure 2-B), a gas path detail of a calibrator (figure 2-C), an external gas source air supply flow (figure 2-M), a compressed air and condensation water removal system (figure 2-D), a refrigerator (figure 2-E), a five-way flow control system (figure 2-F), a sampler one-path flow control system (figure 2-F), a calibrator three-way flow control system (figure 2-F), a catalytic hydrocarbon removal system (figure 2-FT), a hydrogen generator (figure 2-U, the same as figure 1-12), a carrier gas cylinder (figure 2-X, the same figure 1-T), a water removal compressed air inlet cooling system (figure 2-G), a water removal compressed air inlet system (figure 2-G), a hydrogen gas analyzer (figure 2-G), a cold air adsorption pipe temperature reduction system (figure 2-G), a gas removal compressed air supply analyzer (figure 2-G), a gas to be heated (figure 2-G), a hydrogen gas analyzer (figure 2-A), a gas path detail, a gas path analysis (figure 2-A), a gas path detail of a 2-B), a gas path detail of an analyzer (figure 2-2), a 2-2, a 2-2, a 2-2, a 2-2, 2;

in fig. 3: ion detector cross-sectional structure schematic (fig. 3-a); front view of ion detector structure (fig. 3-B); enlarged view of burner head (fig. 3-C); an upper housing (FIG. 3-A-1); an intermediate connection platform (FIG. 3-A-2); a ceramic insulating pad (fig. 3-a-3); a collector (FIG. 3-A-4); an annular air guide groove (figure 3-A-5); a middle outer shell (fig. 3-a-6); an ion chamber (fig. 3-a-7); a burner head (fig. 3-a-8); a metal gasket (fig. 3-a-9); polarizing electrodes (FIG. 3-A-10); an ignition coil (fig. 3-a-11); signaling probes (FIG. 3-A-20); a lower housing (fig. 3-a-21); carrier/make-up gas inlets (fig. 3-a-23); combustion-supporting air intake ports (fig. 3-a-25); gas inlet holes (fig. 3-a-26);

in fig. 4: a two-channel photon detector cross-sectional structure schematic (FIG. 4-A); enlarged view of the light emitting region (fig. 4-B); a two-channel photon detector structure front view (FIG. 4-C); a lower housing (fig. 4-1); a middle outer shell (fig. 4-2); an upper housing (fig. 4-3); an ignition electrode (fig. 4-4); chromatography column interface/make-up gas inlet (fig. 4-5); a burner head (fig. 4-6); a photomultiplier tube housing (FIGS. 4-7); a filter holder (FIGS. 4-8); a light pipe housing (FIGS. 4-9); a muffler (FIGS. 4-10); a hydrogen-oxygen mixed gas 1 inlet (shown in figures 4-11); a hydrogen-oxygen mixed gas 2 inlet (shown in figures 4-12); PMT tube 1 (fig. 4-13); PMT tube 2 (fig. 4-14); quartz tubes (fig. 4-15); the optical filter 1 (fig. 4-16); the optical filter 2 (fig. 4-17); a lower bracket (fig. 4-18); an upper bracket (fig. 4-19); a large diameter quartz tube (FIGS. 4-20); metal gaskets (fig. 4-21); a small diameter quartz tube (FIGS. 4-22); quartz windows (fig. 4-23);

the specific implementation mode is as follows:

1. system peripheral support system (fig. 1): the equipment is standard 4U or 5U equipment, is arranged on a movable cabinet (shown in figures 1-7), is placed in a station room or an explosion-proof cabin (shown in figures 1-S) with an air-conditioning environment or a good ventilation system, connecting system and remote data transmission through exchanger and GPRS/4G/5G/wired router (figure 1-8), using steel cylinder of carrier gas (nitrogen or helium gas) (figure 1-T) as sample and chromatographic column gas, using hydrogen generator (figure 1-12) and zero air (figure 1-4) for removing hydrocarbon and water as fuel gas and combustion-supporting gas, the sample sorbent tube and the focusing tube are heated by ceramic heating tubes (fig. 2-H1/2/3).

2. The system sampling/cold focusing enrichment (figure 1, figure 2-A) comprises that a sampling system performs slow flow of an ambient air sample through a constant-temperature sampling pipe (figure 1-11) and a sampling pipe gas circulating pump (figure 1-10), a sample sampling pump (figure 2-VP1) in a sampler (figure 1-2, figure 2-A) pumps the sample into a sampling adsorption pipe 1/2 (figure 2-T-1/2), the front end of the pumping process performs water removal treatment through a sampling reverse osmosis dehumidification pipe (figure 1-B), when a ten-way solenoid valve (figure 2-V1) is in a closed state (figure 2-N-V1B), sampling is performed by using a sampling adsorption pipe 1 (figure 2-T-1), gas enters the sampling adsorption pipe 1 through a sampling channel (figure 2-L) and a switch valve (figure 2-V5 and a figure 2-V7), when the ten-way solenoid valve (figure 2-V1) is in a closed state (figure 2-N-V1), the state of the sampling adsorption pipe 2 is in a sample cold focusing, high-temperature carrier gas cleaning and temperature reducing process, when the ten-way solenoid valve (figure 2-V1 is in a sampling process, when the ten-V2-V-38, when the sampling adsorption pipe 2 is in a sampling adsorption pipe is in a sampling adsorption process, when the sampling adsorption pipe is in a sample-V2, when the sampling adsorption pipe is in a sampling adsorption process, when the sampling adsorption pipe 2, the sampling adsorption pipe 962, the sampling adsorption pipe is in a sample-V.

3. Analytical system (FIG. 1, FIG. 2-B, FIG. 2-M):

a) analytical procedure (FIG. 2-B): the analysis process adopts the sample introduction three-way solenoid valve to open (figure 2-V4) to switch the sample introduction and the standby process, the sample introduction process adopts the six-way solenoid valve to open (figure 2-N-V2A), the split/non-split sample introduction (figure 2-Q) is used, the diameter of a sample introduction port is 2mm, the length is 10-15 mm, the first separation is carried out through a pre-column (figure 2-SC-1), the length of the pre-column is 10-30 m, and the flow rate of a carrier gas in the parallel chromatographic column is balanced through a chromatographic column supplementary gas constant flow system (figure 2-S), so that the flow rate of the two columns is always constant no matter which switching condition the parallel chromatographic column (figure 2-SC-2/3) is. And finally, respectively enabling the target time sample to enter the two detectors according to the requirement. The detector can be switched according to the nature of the target to be analyzed.

b) Gas supply system (fig. 2-M): air supply: the compressed air and condensation water remover (figure 2-D) supplies air (figure 2-E) to the refrigerator (figure 2-E) and returns low-flow cooling gas (figure 2-G3) to condense and remove water (drain water through an oil-water separator) through a parallel double-sleeve structure, and the other path of low-temperature gas (figure 2-G4) and normal-temperature gas (figure 2-G6) are supplied to a purging adsorption pipe area (figure 2-K-H1/H2/H3). And the other path of normal temperature gas (shown in figure 2-G2) is supplied to a hydrocarbon removal device (shown in figure 2-FT) and then is supplied to an analyzer flow control device (shown in figure 2-F1) as combustion-supporting gas (shown in figure 2-G5). Hydrogen gas supply: the hydrogen generator (fig. 2-U, fig. 1-12) produces a combustion gas supply (fig. 2-G7) and an analyzer controlled flow device (fig. 2-F1). Carrier gas supply: the carrier gas cylinders (fig. 2-X, fig. 1-T) supply three paths of carrier gas. In the first path, an analyzer flow control device (fig. 2-F1) provides a chromatographic column carrier gas (fig. 2-G10); in the second path, a sampler flow control device (fig. 2-F2) provides a sampling tube to focusing tube gas transfer gas (fig. 2-G9); third, the prover flow control device (fig. 2-F3) provides different flow rates of diluent gas (fig. 2-G8).

c) A flow stabilizing and constant flow (figure 2-S) of supplementary gas of a chromatographic column is realized by adopting three capillary tubes with different lengths and different inner diameters for flow limiting (figure 2-S-1/2/5), when a three-way gas switching valve (figure 2-V3) is in different states (V3-1 and V3-2 are communicated, V3-1 and V3-3 are communicated), and the flow (figure 2-SC2 and figure 2-SC3) of two output chromatographic columns (figure 2-SC L8 and figure 2-L9) is always constant.

4. Ion detector (fig. 3): the sample gas is mixed with hydrogen and then combusted in the air to generate positive and negative ions, the micro-current formed by the positive ions or electrons is collected for detection, and the temperature of a detector is up to 300 ℃. The chromatographic column enters the combustion head through the carrier gas inlet/supplementary gas inlet (figure 3-A-23), the depth is about 2mm above the conical surface of the combustion head (figure 3-C), the chromatographic column is a hydrogen and sample gas mixing area from the top of the combustion head, then the mixed gas is sprayed out from the nozzle of the combustion head, a stable combustion flame is formed in the collector (figure 3-A-4), and the mixed gas is ignited through discharge ignition or an ignition coil (figure 3-A-11) to generate sample positive ions or electrons. Positive ions or electrons are separated through a polarized electrode (figure 3-A-10) (the polarized voltage and the polarity affect the property and the intensity of the collected ions), the separated positive ions or electrons are collected by a collector, and signals are led out through a signal probe (figure 3-A-20) to carry out collection and analysis (a data collection system is compatible with the collection of positive and negative ions to form current). In order to improve the chromatographic peak shape, one path of gas can be introduced through the carrier gas inlet/supplementary gas inlet to improve the air pressure of the mixing area, so that the better symmetry of the peak shape is ensured.

5. Characteristic wavelength two-channel photon detector (fig. 4): gases with different hydrogen-oxygen mixing ratios are simultaneously combusted inside and outside the quartz tube, and as hydrocarbons, sulfides, ammonia nitrogen and sulfur phosphorus substances emit light (have a hysteresis effect) after being extinguished by combustion, and the light-emitting wavelength and the light-emitting time are different, the gases can be effectively distinguished by using the optical filter and the high-speed data acquisition system, and the sensitivity and the linear range of the gases are superior to those of a conventional flame photo-ion detector. The sample enters the detector through the chromatographic column interface/supplementary gas inlet (figure 4-5), the chromatographic column goes deep into the ion detector (figure 3) for illustration (the same combustion head is adopted for the ion detector), the hydrogen-oxygen mixed gas 1 (figure 4-11) is mixed with the sample and is sprayed out from the combustion head (the combustion is carried out in the quartz tube), the hydrogen-oxygen mixed gas 2 (figure 4-12) is sprayed out from the outside of the combustion tube (the combustion is carried out in the outside of the quartz tube), the two mixed gases are mixed at the bottom of the upper shell (figure 4-3) and reach the discharge ignition electrode (figure 4-4) through the internal extension channel, and the gas is combusted reversely after being ignited. The burning quartz tube adopts two specifications, one of the burning quartz tube and the burning quartz tube is arranged according to different analysis materials, the burning quartz tube comprises a large-diameter quartz tube (figure 4-20) or a small-diameter quartz tube (figure 4-22), two sides of a middle shell (figure 4-2) are sealed by a high-transmittance quartz window (figure 4-23) and a metal sealing gasket, two different PMTs can be arranged at two ends of the detector, the middle part is connected by a light-isolating sleeve quartz tube (figure 4-15) structure, and the requirements of analyzing different characteristic compounds are met by replacing different light filters (figure 4-16/17) and PMTs.

6. System calibration and quality control (fig. 1, fig. 2-C):

a) the calibrator has the working modes of firstly being of a negative pressure extraction type and aiming at a system calibration channel (figure 1-A-12), secondly being of a positive pressure direct output type and aiming at a system quality control channel (figure 1-A-3), thirdly being of system cleaning, closing a sample injection valve (figure 2-V13), opening a cleaning valve (figure 2-V14 and figure 2-V15), opening a cleaning gas tank pump (figure 2-VP2), and repeatedly purging a gas tank (figure 2-J) for at least 5 times by using a dilution gas (figure 2-X) input dilution gas inlet (figure 2-L15), wherein the humidifier valve (figure 2-V11) is opened by the 3 rd purging.

b) And (3) system calibration: after the system is cleaned, a clean gas tank pump is used for enabling the gas tank to be in a negative pressure state, dilution gas, quality control gas and calibration gas are input into the gas tank (dilution with different concentrations is completed at different flow rates), the gas tank is enabled to be in micro-positive pressure, the pressure of the gas tank is released, the pressure balance process is a clean back-end pipeline, and a standard curve is drawn after the analysis process is started according to different concentrations.

c) And (3) after the system is cleaned, inputting a dilution gas into a dilution gas inlet, inputting a quality control gas into a quality control gas inlet (shown in figures 2-L16), preparing the quality control gas by using a calibrator flow control system (shown in figures 2-F3), introducing the quality control gas into a sampling system quality control inlet (shown in figures 1-C), pumping the quality control gas into a sampling pipe by using a sampler sampling pump (shown in figures 2-VP1), and correcting a calibration error generated by the sampling system through sample transfer, analysis and correction.

7. Data acquisition, control, analysis, transmission system (fig. 1): the data analysis system (figures 1-6) uses the exchanger (figures 1-8) to connect each device for data acquisition and control, the TCP/IP protocol is cooperated with the sequence operation among the devices, the analysis software generates the final target concentration according to the calibration result, and finally the analysis data is transmitted to the designated position of the public network through GPRS/4G/5G wireless data transmission (figures 1-9).

The implementation effect is as follows:

the invention organically unifies different systems, realizes the analysis of organic gas in the air by replacing chromatographic columns and detectors according to different requirements, effectively improves the compatibility and expansibility, can cover the detection of hydrocarbons, aldehydes, ketones, alcohols, chlorides, ammonia nitrogen and sulfur phosphorus, and ensures that experimental data has higher precision, accuracy and wider statistical significance by controlling through a full-automatic method and combining with a reasonable calibration quality control system.

Claims

1. The novel on-line analysis system for organic matters in air is characterized in that a three-way thermal desorption system adopting low-temperature external heat exchange refrigeration, a three-way chromatographic column adopting shunt/non-shunt sampling and a dual-ion/photon detector are used as a main analysis system, and a calibration system adopting direct sampling multi-point calibration and sampling tube sampling quality control is used for carrying out full analysis on organic volatile/semi-volatile organic matters in air.

2. The dual-channel external refrigeration sampling and external cold focusing sample introduction system according to claim 1, characterized in that: the sampling system slowly flows an environmental air sample through a constant-temperature sampling pipe and a sampling pipe gas circulating pump, the environmental air sample is pumped into a sampling adsorption pipe 1/2 through a sample sampling pump in a sampler, the front end of the pumping process is subjected to water removal treatment through a sampling reverse osmosis dehumidification pipe, when a ten-way electromagnetic valve is in an off state, the sampling adsorption pipe 1 is used for sampling, the gas enters the sampling adsorption pipe 1 through a sampling channel and a switch valve, at the moment, the state of the adsorption pipe 2 is in the processes of sample cold focusing, high-temperature carrier gas cleaning and cooling, when the ten-way electromagnetic valve is in an on state, the adsorption pipe 2 is used for sampling, the gas enters the sampling adsorption pipe 2 through the sampling channel and the switch valve, at the moment, the state of the adsorption pipe 1 is in the processes of sample focusing, high-temperature carrier gas cleaning and cooling, the cold focusing process of the sample pipe T-2 is in the process of the, and the sample gas is transferred to the low-temperature focusing pipe through the channel, and the ten-way valve switch and the six-way valve switch are sampling pipe sample transfer processes.

3. The calibration and quality control system of claim 1, wherein the calibration method comprises a dual quality control mode of calibration multi-point curve quality control and sampling port sample injection compensation quality control, wherein the external refrigeration is adjustable from-120 ℃ to normal temperature, a clean gas tank pump is used to enable the gas tank to be in a negative pressure state, the diluent gas, the quality control gas and the calibration gas are input into the gas tank (different flow rates are used to dilute different concentrations), the gas tank is in a micro-positive pressure state, the pressure of the gas tank is released, the pressure balance process is performed by cleaning a rear-section pipeline, and a standard curve is drawn after the analysis process is started according to different concentrations.

4. The novel analysis system of claim 1, comprising a novel large-span adaptive ion detector and a novel characteristic wavelength dual-channel photon detector, which can perform adaptive large-span concentration switching, thereby realizing full analysis of organic volatile/semi-volatile organic compounds in air.

5. The novel large-span self-adaptive ion detector according to claim 4, is characterized in that sample gas is mixed with hydrogen and then combusted in air to generate positive and negative ions, the positive ions or micro-current formed by electrons is collected for detection, and the temperature of the detector is up to 300 ℃. The chromatographic column enters the combustion head through the carrier gas inlet/supplementary gas inlet, the deep position is the combustion head, the upper part of the conical surface is about 2mm, the chromatographic column is a hydrogen and sample gas mixing area to the top of the combustion head, then the mixed gas is sprayed out from the nozzle of the combustion head, stable combustion flame is formed in the collector, the mixed gas is ignited through a discharge ignition or ignition coil, sample positive ions or electrons are generated, the positive ions or electrons are separated through a polarized electrode, the separated positive ions or electrons are collected by the collector, signals are led out through a signal probe to carry out collection and analysis (a data collection system is compatible with the collection of positive and negative ions to form current), in order to improve the chromatographic peak shape, one path of gas is introduced through the carrier gas inlet/supplementary gas inlet to improve the air pressure of the mixing area, and better symmetry of the peak shape.

6. The novel dual-channel photon detector with characteristic wavelength as claimed in claim 5, wherein gases with different oxyhydrogen mixing ratio are simultaneously combusted inside and outside the quartz tube, because hydrocarbons, sulfides, ammonia nitrogen and sulfur phosphorus substances are extinguished to emit light, and the light-emitting wavelength and the light-emitting time are different, the gases can be effectively distinguished by using the optical filter and the high-speed data acquisition system, the sensitivity and the linear range of the detector are superior to those of the conventional flame photo-ion detector, the sample enters the detector through the chromatographic column interface/supplementary gas inlet, the chromatographic column is deep from the ion detector, the oxyhydrogen mixed gas 1 is mixed with the sample, is sprayed from the combustion head and is combusted inside the quartz tube, the oxyhydrogen mixed gas 2 is sprayed from the outside of the combustion tube and is combusted outside the quartz tube, and the two mixed gases are mixed at the bottom of the upper outer shell and reach the discharge ignition electrode through the internally extending, the gas is ignited and then reversely combusted, the combustion quartz tube adopts two specifications, one of the two specifications is installed according to different analysis substance requirements each time, the two specifications comprises a large-diameter quartz tube or a small-diameter quartz tube, high-transmittance quartz windows and metal sealing gaskets are used for sealing two sides of a middle outer shell, two different PMTs can be installed at two ends of a detector, a light-isolating sleeve quartz tube structure is used for connecting the middle, and the requirements of analyzing different characteristic compounds are met by replacing different optical filters and PMTs.