Pulse type flame photometric detection device

Abstract

The invention belongs to the technical field of flame detection, and particularly discloses a pulse type flame photometric detection device which comprises a detector body, a combustion chamber, an igniter, a combustion chamber air inlet pipe, an ignition chamber air inlet pipe, a light transmission assembly and a signal processing assembly. A circulation cavity and an air entraining channel are formed in the detector body, the combustion chamber is installed in the circulation cavity, the igniter is installed on the detector body and located above the combustion chamber, and the air entraining channel is located between the combustion chamber and the ignition chamber and communicated with the combustion chamber and the ignition chamber. Mutually communicated air holes are formed between the top wall of the circulation cavity and the air entraining channel, the ignition chamber air inlet pipe is communicated with the circulation cavity, the combustion chamber air inlet pipe is communicated with the combustion chamber, and the combustion chamber is further communicated with a sample inlet pipe used for introducing a measured substance; one end of the light transmission assembly is located in the circulation cavity and located on one side of the combustion chamber, and the signal processing assembly is used for collecting characteristic photons transmitted in the light transmission assembly. Noise photons can be effectively reduced, and the sensitivity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flame detection, and in particular to a pulsed flame photometric detection device. Background Art

[0002] Gas chromatography is used to detect specific elements (and their compounds) contained in a sample. It is a qualitative analysis and is generally used in conjunction with various detectors. In the prior art, the most common method for detection is using an FPD detector, or flame photometric detector. The FPD detector is a highly selective and sensitive detector for phosphorus- and sulfur-containing compounds. When the object being detected burns in a hydrogen-rich flame, phosphorus-containing organic compounds mainly emit characteristic light with a wavelength of 526nm in the form of HPO fragments, while sulfur-containing compounds emit characteristic light with a wavelength of 394nm in the form of S2 molecules. The emitted characteristic light passes through the light-passing component and enters the photomultiplier tube. The photomultiplier tube then converts the optical signal into an electrical signal, which is amplified and recorded by microcurrent for easy analysis and research.

[0003] The FPD detector in the prior art uses continuous flame combustion, which easily generates background noise, resulting in the collection of some unwanted interfering photons in the characteristic light entering the photomultiplier tube; and the FPD detector in the prior art has poor sensitivity and low selectivity. Summary of the Invention

[0004] The present invention provides a pulsed flame photometric detection device, which aims to reduce noise photons in the detection process and improve sensitivity.

[0005] The present invention is achieved through the following technical solutions: a pulsed flame photometric detection device, comprising a detector body, a combustion chamber, an ignition chamber, a combustion chamber air intake pipe, an ignition chamber air intake pipe, a light-passing component and a signal processing component, wherein an igniter is installed on the ignition chamber;

[0006] A flow cavity and an air bleed channel are provided in the detector body, the combustion chamber is installed in the flow cavity, the ignition chamber is installed on the detector body and is located above the combustion chamber, and the air bleed channel is located between the combustion chamber and the ignition chamber and is in communication with the combustion chamber and the ignition chamber;

[0007] An air hole is provided between the top wall of the circulation cavity and the air inlet channel, the ignition chamber air inlet pipe is connected to the circulation cavity, the combustion chamber air inlet pipe is connected to the combustion chamber, and the combustion chamber is also connected to a sample injection tube for introducing the substance to be tested;

[0008] One end of the light-passing component is located in the flow cavity and on one side of the combustion chamber, and the signal processing component is used to collect characteristic photons transmitted in the light-passing component.

[0009] Compared with the existing technology, this solution has the following advantages and beneficial effects:

[0010] The detector in this scheme is a PFPD detector, which fills hydrogen-rich mixed air into the combustion chamber through the combustion chamber air inlet pipe, fills the measured substance into the combustion chamber through the sampling tube, and fills the hydrogen-air mixture into the ignition chamber through the ignition chamber air inlet pipe. The igniter ignites, so that the flame in the ignition chamber ignites the mixed gas of the measured substance and hydrogen-rich mixed air in the combustion chamber, thereby generating a flame in the combustion chamber; when in use, the ignition chamber and the gas chamber can be filled with equal proportions of gas through proportional design, so that the gases in the ignition chamber and the gas chamber are burned out at the same time, the flames are extinguished at the same time, and then gas is filled in and burned again, thereby achieving the effect of flame pulse combustion.

[0011] The substance being tested is ignited by a hydrogen-rich flame in the combustion chamber and produces chemiluminescence (the wavelength of chemiluminescence produced by different substances is different). The characteristic photons produced by the combustion of the substance being tested are transmitted through the light-transmitting component and are collected by the signal processing component and converted into electrical signals for easy analysis.

[0012] Since various substances (CH*, C2*, OH*, S2*, P2*, etc.) in the pulsed combustion flame have specific chemiluminescence spectra and specific chemiluminescence delay characteristics, the pulsed flame in this solution can enable the light-transmitting component to selectively filter according to the different emission times of different photons when transmitting characteristic photons. For example, some photons that do not need to be collected have an earlier emission time and a very short emission time, while the photon substances we need to analyze, such as S2* and P2*, have a later emission time and a longer emission time. Therefore, when the photon substances we need are emitted, the emission of the unnecessary photon substances is completed. In this way, the unnecessary photon substances emitted first can be filtered to reduce noise. Therefore, the pulsed flame photometric detection device using this solution can easily separate the luminescence of the required substances from the luminescence of the unnecessary substances in terms of time, thereby enhancing its selectivity.

[0013] The differences in emission lifetimes for specific species in this scheme, combined with the dynamics of a propagating flame, allow the use of time and wavelength information to improve the selectivity of the PFPD detector (a pulsed flame photometric device in this scheme), reduce observed noise, and increase sensitivity. The propagating flame utilizes lower combustible gas flow rates, increasing relative analyte concentrations. In practical applications, gating electronics can also be used to suppress noise outside a specified gate window, further improving the detection rate of the pulsed flame photometric device.

[0014] Furthermore, a reflector is provided directly opposite to the light-passing component. The reflector and the light-passing component are located on both sides of the combustion chamber, and the reflector is mounted on the detector body.

[0015] Beneficial effect: The reflector in this solution can reflect photons, collect as many photons as possible from the side of the combustion chamber and reflect them to the light-passing component, so that the photons propagate along the light-passing component and reduce the loss of photons.

[0016] Furthermore, the signal processing component includes a multiplier tube sleeve and a photomultiplier tube, and the photomultiplier tube is located in the multiplier tube sleeve;

[0017] The light-transmitting assembly includes a support tube, a light guide rod and a filter. The light guide rod is located inside the support tube. Both ends of the support tube are open ends. The two ends of the support tube are respectively connected to the multiplier tube sleeve and the detector body. The filter is installed in the multiplier tube sleeve and is located between the photomultiplier tube and the light guide rod.

[0018] Beneficial effects: The signal processing component in this scheme collects photons through a photomultiplier tube and converts them into electrical signals; the light guide rod in the light-transmitting component in this scheme enables photons to propagate along the light guide rod, and after filtering out noise photons through a filter, they are received by the photomultiplier tube and converted into electrical signals, which is convenient for analysis and processing.

[0019] Furthermore, the light guide rod is a translucent quartz light guide rod, both ends of the light guide rod are polished to form mirror surfaces, and the outer circumference of the light guide rod and the mirror surfaces at both ends are plated with a silver mirror coating.

[0020] Beneficial Effects: In the traditional FPD detector light transmission structure, only a small portion of the various photons in the combustion chamber are transmitted through the metal tube to the PMT photomultiplier tube receiving component. Some of the various photons in the metal tube will collide with the metal tube and dissipate due to different propagation angles. The traditional FPD detector light transmission structure has low light collection efficiency. In this solution, the light guide rod is a transparent quartz light guide rod, and the two ends of the light guide rod are mirror polished. The outer circumference of the light guide rod and the mirror surface at both ends are coated with a silver mirror coating. This can ensure that various photons of different angles are refracted and propagated in the quartz light guide rod as much as possible, reducing the loss of photons during propagation, enhancing the collection of weak light signals of excitation light, and improving weak light detection capabilities.

[0021] Compared with the traditional structure, the light-transmitting component structure of this solution can greatly improve the light collection efficiency of the photomultiplier tube, increase the sensitivity of the detector and the minimum detection limit.

[0022] Furthermore, the support tube is made of bakelite.

[0023] Beneficial effect: In this solution, the support tube is made of bakelite with a thermal conductivity coefficient between 0.15 and 19. After the high temperature of the detector body is blocked by the highly transparent quartz light guide rod and the bakelite support tube, the temperature of the photomultiplier tube component can be basically consistent with the ambient temperature, avoiding the temperature on the detector body being transferred to the photomultiplier tube and affecting its detection accuracy.

[0024] Furthermore, the bottom of the circulation cavity is connected to an air inlet nozzle, the top of the air inlet nozzle is connected to a lower support block, the top of the circulation cavity is connected to an upper support block, the bottom of the upper support block and the top of the lower support block are both provided with mutually facing slots, the two ends of the combustion chamber are respectively stuck in the slots of the upper support block and the lower support block, and one end of the sampling tube passes through the air inlet nozzle and the lower support block in sequence to communicate with the combustion chamber;

[0025] A center hole is provided in the center of the upper support block, and the center hole is communicated with the air inlet channel and the combustion chamber. An annular groove is provided at the top of the upper support block, and a plurality of air holes are provided along the circumference of the bottom of the annular groove, and the air holes are communicated with the flow cavity and the air inlet channel.

[0026] Beneficial effects: In this solution, the air inlet nozzle is connected to the bottom of the circulation chamber, which can not only seal the circulation chamber, but also facilitate the installation of the lower support block. In this solution, the two ends of the combustion chamber are respectively stuck in the grooves of the upper support block and the lower support block, thereby realizing the installation and fixation of the combustion chamber. This assembly method is simple.

[0027] In addition, in this scheme, the center hole on the upper support block and the air duct opened on the detector body can connect the combustion chamber and the ignition chamber, which is convenient for igniting the gas in the combustion chamber to produce a flame. At the same time, the annular groove and multiple air holes opened on the upper support block can guide the gas entering the gas chamber into the ignition chamber, which is convenient for ignition. Compared with the method of directly opening multiple air holes on the upper support block, in this scheme, an annular groove is opened on the upper support block, and the top of the air hole is located in the annular groove. In such a setting, when the flame generated in the ignition chamber extends downward, the flame can be extinguished when it contacts the annular groove, avoiding burning downward through the air hole. In this way, it can be ensured that the ignition chamber will only ignite the mixed gas in the gas chamber through the center hole of the upper support block.

[0028] Furthermore, the upper support block and the lower support block are both made of PEEK material, and the combustion chamber is made of quartz material.

[0029] Beneficial effects: In this solution, the overall structure of the combustion chamber and the upper and lower support blocks are all made of inert materials, which can minimize the adsorption of various adsorptive gases such as sulfides and phosphides, and avoid affecting the accuracy of substance detection.

[0030] Furthermore, the combustion chamber and the ignition chamber are arranged alternately, and the air induction channel is perpendicular to the ignition chamber and the combustion chamber and is interconnected.

[0031] Beneficial effect: In this solution, the combustion chamber and the ignition chamber are staggered, so that the gases filled into the ignition chamber and the combustion chamber do not interfere with each other. If the two are set vertically opposite each other, it is easy to make the design of the gas path leading to the ignition chamber and the combustion chamber more complicated. In this solution, the two can be connected only through the air duct, which is convenient for ignition.

[0032] Furthermore, the igniter is provided with two groups, and both groups of the igniter include an ignition tungsten needle and a sleeve;

[0033] The sleeve is installed on the detector body, the ignition tungsten needle passes through the sleeve, and one end of the ignition tungsten needle is connected to the power supply, the other end of the ignition tungsten needle passes through the sleeve and is located in the ignition chamber, and the two ignition tungsten needles are located at one end of the ignition chamber and are arranged opposite to each other.

[0034] Beneficial effects: This solution uses an ignition tungsten needle, which has a high melting point, corrosion resistance, high density, and good thermal and electrical conductivity. With this ignition device, the ignition tungsten needle at the ignition end will not be oxidized, aged or corroded, thereby effectively improving the life of the ignition device.

[0035] In addition, the ignition tungsten of the two groups of igniters in the ignition device of this scheme are arranged facing each other, so that an arc is generated after power is turned on, which plays the role of ignition. The setting of the sleeve can protect and guide the installation of the ignition tungsten needle, so that the ignition tungsten needle can be smoothly installed on the detector body, while protecting the ignition tungsten needle from external damage.

[0036] Furthermore, the light-transmitting components are provided in two groups, the two groups of light-transmitting components are located in the same plane, and the two groups of light-transmitting components are arranged perpendicular to each other.

[0037] Beneficial effects: The two light-transmitting components in this solution can detect two substances simultaneously in one detector, effectively improving the detection efficiency and enhancing the practicality and applicability of the device.

[0038] The optical paths of the two light-transmitting components in this solution are arranged at 90° orthogonal to each other, avoiding the problem of mutual influence of the excitation light when the two light-transmitting components are in a straight line. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0040] Figure 1A longitudinal cross-sectional view of an embodiment of a pulsed flame photometric detection device of the present invention;

[0041] Figure 2 A partial longitudinal cross-sectional view of an embodiment of a pulsed flame photometric detection device of the present invention;

[0042] Figure 3 This is a top view of a detector body in an embodiment of a pulsed flame photometric detection device of the present invention;

[0043] Figure 4 A three-dimensional diagram of an upper support block in an embodiment of a pulsed flame photometry detection device of the present invention;

[0044] Figure 5 A three-dimensional diagram of an upper support block from another perspective in an embodiment of a pulsed flame photometry device of the present invention;

[0045] Figure 6 This is a schematic diagram of the connection between the igniter, the detector body and the power supply in an embodiment of a pulsed flame photometry detection device of the present invention;

[0046] Figure 7 This is a cross-sectional view of the connection between the dual-pass light component and the detector body in an embodiment of a pulsed flame photometry detection device of the present invention.

[0047] Markings and corresponding parts names in the accompanying drawings:

[0048] Detector body 100, combustion chamber 1, circulation chamber 2, ignition chamber 3, igniter 4, ignition tungsten needle 401, sleeve 402, arc 403, potting glue 404, power supply 405, mounting cavity 406, flame arrester 5, exhaust channel 6, connector 60, reflector 7, cover 70, light guide rod 8, support tube 80, silver mirror coating 9, filter 10, photomultiplier tube 11, heating rod 12, temperature probe 13, injection tube 14, combustion chamber air inlet pipe 15, ignition chamber air inlet pipe 16, connecting bolt 17, multiplier tube sleeve 18, connecting sleeve 19, back tightening nut 20, air bleed channel 21, connecting port 22, air inlet nozzle 23, upper support block 24, annular groove 241, air hole 242, center hole 243, card slot 244, lower support block 25. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0050] like Figure 1-Figure 2As shown, this embodiment provides a pulsed flame photometric detection device, comprising a detector body 100, a combustion chamber 1, an ignition chamber 3, a combustion chamber air intake pipe 15, an ignition chamber air intake pipe 16, a light transmission component, and a signal processing component;

[0051] In this embodiment, the detector body 100 is made of 316 stainless steel. In this embodiment, the detector body 100 includes an upper body and a lower body. The upper body is overlapped and installed on the top of the lower body. The upper body and the lower body are fixedly connected by connecting bolts 17, and the upper body and the lower body are sealed by installing a sealing ring to ensure the airtightness of the detector body 100. Figure 3 As shown, the upper body and the lower body both form a rectangular structure, and the four right angles of the upper body and the lower body are fixed by connecting bolts 17. This design divides the detector body 100 into two parts, the upper body and the lower body, which is convenient for installing parts in the upper body and the lower body, and is convenient for processing and production. At the same time, it is convenient to disassemble the upper body and the lower body and then inspect and replace the parts installed in the detector body 100.

[0052] Combine Figure 2 and Figure 3 As shown, in this embodiment, a temperature probe 13 and a heating rod 12 are installed on the detector body 100. The temperature probe 13 and the heating rod 12 are both extended into the upper body of the detector body 100. The heating rod 12 heats the detector to meet the requirements of stable working environment, and the temperature probe 13 is convenient for detecting the temperature of the detector body 100, thereby facilitating the control of the heating temperature of the heating rod 12 through the temperature control component.

[0053] In this embodiment, a flow cavity 2 and an air inlet channel 21 are provided in the detector body 100 . The flow cavity 2 is provided in the lower body of the detector body 100 , and the air inlet channel 21 is provided at the bottom end of the upper body of the detector body 100 .

[0054] The combustion chamber 1 is installed in the circulation cavity 2, and the ignition chamber 3 is installed on the detector body 100 and is located above the combustion chamber 1, that is, the ignition chamber 3 is installed on the upper body, and the air bleed channel 21 is located between the combustion chamber 1 and the ignition chamber 3 and is connected to the combustion chamber 1 and the ignition chamber 3. In this embodiment, the combustion chamber 1 and the ignition chamber 3 are staggered, that is, the combustion chamber 1 and the ignition chamber 3 are not located on the same straight line. The air bleed channel 21 is perpendicular to the ignition chamber 3 and the combustion chamber 1 and is connected to each other. In this embodiment, the ignition chamber 3 is a pipeline structure, and the bottom end of the ignition chamber 3 is connected to a connecting port 22, and the connecting port 22 is perpendicular to the air bleed channel 21 and is connected, so that the ignition chamber 3 and the combustion chamber 1 are connected through the connecting port 22 and the air bleed channel 21. An igniter 4 is installed on the ignition chamber 3, and the igniter 4 is used to ignite into the ignition chamber 3 and ignite the mixed gas in the ignition chamber 3.

[0055] Interconnected air holes 242 are provided between the top wall of the circulation chamber 2 and the air inlet channel 21. The ignition chamber air inlet pipe 16 is connected to the circulation chamber 2, and the combustion chamber air inlet pipe 15 is connected to the combustion chamber 1. The combustion chamber 1 is also connected to the sampling tube 14 for introducing the substance to be tested. Specifically:

[0056] An air inlet nozzle 23 is connected to the bottom of the circulation chamber 2. In this embodiment, the upper part of the air inlet nozzle 23 extends into the circulation chamber 2 and is threadedly connected to the inner wall of the circulation chamber 2. A sealing ring is installed between the air inlet nozzle 23 and the bottom end of the circulation chamber 2 to ensure the sealing of the circulation chamber 2. An air inlet channel connected to the gas chamber is opened inside the air inlet nozzle 23.

[0057] The top of the air inlet nozzle 23 is connected to the lower support block 25, and the top of the circulation chamber 2 is connected to the upper support block 24. In this embodiment, the lower support block 25 is threadedly connected to the upper part of the air inlet nozzle 23. A groove is provided at the top of the lower body of the detector body 100, and the groove and the circulation chamber 2 form a stepped hole shape. The upper support block 24 is installed in the groove and is located at the top of the circulation chamber 2.

[0058] The bottom of the upper support block 24 and the top of the lower support block 25 are both provided with mutually opposite slots 244, and the two ends of the combustion chamber 1 are tightly clamped in the slots 244 of the upper support block 24 and the lower support block 25 respectively. In this way, the combustion chamber 1 is fixed in the flow chamber 2 under the restrictive action of the upper support block 24 and the lower support block 25.

[0059] One end of the sample tube 14 passes through the air inlet passage of the air inlet nozzle 23 and the lower support block 25, communicating with the combustion chamber 1. In this embodiment, a hole is provided at the bottom of the slot in the lower support block 25. The inner diameter of the hole is larger than the outer diameter of the sample tube 14. This creates a gap between the sample tube 14 and the hole in the lower support block 25 after it passes through it, allowing the air inlet passage of the air inlet nozzle 23 to communicate with the combustion chamber through the hole. In this embodiment, a sealing ring is provided between the combustion chamber 1 and the slot in the lower support block 25 to prevent gas entering through the air inlet nozzle 23 from leaking out of the combustion chamber 1.

[0060] In this embodiment, the sampling tube 14 is a quartz capillary tube with a small inner diameter for introducing the substance to be measured. Thus, the sampling nozzle portion of the combustion chamber 1 is directly inserted with the quartz capillary tube instead of the nozzle.

[0061] One end of the combustion chamber air intake pipe 15 in this embodiment penetrates into one side of the air intake nozzle 23 and communicates with the air intake channel of the air intake nozzle 23, thereby communicating with the combustion chamber 1 through the air intake nozzle 23, making it convenient to fill the combustion chamber 1 with gas. In this embodiment, the gas filled from the combustion chamber air intake pipe 15 is a hydrogen-rich air mixture, and the gas filled from the ignition chamber air intake pipe 16 is a hydrogen-containing air mixture.

[0062] In this embodiment, the upper support block 24 and the lower support block 25 are both made of PEEK material. PEEK material (polyetheretherketone) has the characteristic of being resistant to high temperatures. The combustion chamber 1 is made of quartz material. In this embodiment, the combustion chamber 1 is specifically a highly transparent quartz tube. The volume of the combustion chamber 1 is 35-39 microliters. The small volume of the combustion chamber 1 can increase the equivalent concentration of the substance being measured, thereby improving the sensitivity of the detector.

[0063] The overall structure formed by the combustion chamber 1, the upper support block 24 and the lower support block 25 are all made of inert material components, which can minimize the adsorption of various adsorptive gases such as sulfides and phosphides, thereby ensuring the accuracy of detection.

[0064] Combine Figure 2 、 Figure 4 and Figure 5 As shown, a center hole 243 is provided in the center of the upper support block 24, and the center hole 243 is communicated with the air bleed channel 21 and the combustion chamber. An annular groove 241 is provided at the top of the upper support block 24, and a plurality of air holes 242 are provided at the bottom of the annular groove 241 along its circumference. The plurality of air holes 242 are evenly distributed along the circumference of the annular groove 241, and the air holes 242 are communicated with the circulation cavity 2 and the air bleed channel 21.

[0065] Combine Figure 1 and Figure 2 As shown, one end of the light-passing component is located in the flow cavity 2 and on one side of the combustion chamber 1. The signal processing component is used to collect characteristic photons transmitted in the light-passing component. A reflector 7 is provided directly opposite the light-passing component. The reflector 7 and the light-passing component are located on both sides of the combustion chamber 1, and the reflector 7 is installed on the detector body 100. Specifically:

[0066] like Figure 1 As shown, the signal processing assembly in this embodiment includes a multiplier tube sleeve 18 and a photomultiplier tube 11. The photomultiplier tube 11 is located in the multiplier tube sleeve 18. In this embodiment, one end of the multiplier tube sleeve 18 is detachably connected to a connecting sleeve 19. In this embodiment, the connecting sleeve 19 is threadedly connected to the multiplier tube sleeve 18 for easy disassembly and installation. A through hole is formed at the end of the connecting sleeve 19.

[0067] Combine Figure 2As shown, in this embodiment, installation channels connected to the flow cavity 2 are provided on both sides of the lower body of the detector body 100 that are opposite to each other, and the installation channels are opposite to the through holes at the ends of the connecting sleeve 19. One end of the light-transmitting component is connected to one of the installation channels, and the reflector 7 is installed and connected to the other installation channel. In this embodiment, a cover 70 is detachably connected to the installation channel for installing the reflector 7, and the reflector 7 is fixed to one end of the cover 70. The reflector 7 is arranged opposite to the light-transmitting component. A group of mirror reflectors 7 is added opposite to the light-transmitting component, which can collect as many photons as possible from the side of the combustion chamber 1 and reflect them into the light-transmitting component. In this embodiment, a sealing ring is provided between the cover 70 and the installation channel for sealing, and the cover 70 is threadedly connected to the installation channel, thereby facilitating the installation, disassembly and replacement of the reflector 7.

[0068] In this embodiment, a group of light-transmitting components is provided, and the light-transmitting components include a support tube 80 and a light guide rod 8. The light guide rod 8 is located on the inner side of the support tube 80. Both ends of the support tube 80 are open ends, which facilitates the light guide rod 8 to smoothly transmit characteristic photons in the direction of the photomultiplier tube. The two ends of the support tube 80 are respectively connected to the multiplier tube sleeve 18 and the detector body 100. Specifically, in this embodiment, the two ends of the support tube 80 respectively extend into the through hole of the connecting sleeve 19 and the installation channel on the lower body side of the detector body 100, and are threadedly connected to the through hole of the connecting sleeve 19 and the installation channel of the detector body 100. A sealing ring is provided between the support tube 80 and the through hole and installation channel of the connecting sleeve 19 for sealing to ensure the airtightness of the light-transmitting component.

[0069] In this embodiment, the light guide rod 8 is a high-transmittance quartz light guide rod. Both ends of the light guide rod 8 are polished to form a mirror surface using a mirror polishing process. Various characteristic photons generated by the combustion of the measured substance in the combustion chamber 1 are transmitted from the light guide rod 8 through the side wall of the guide rod to the surrounding area. In this embodiment, a silver mirror coating 9 is plated on the outer circumference of the light guide rod 8 and the mirror surface at both ends. That is, the outer circumference of the guide rod and the mirror surface at both ends are silver-plated to ensure that various photons of different angles are refracted and transmitted in the quartz rod as much as possible, reducing the loss of photons during transmission, and enhancing the collection of weak light signals of the excitation light, thereby improving the weak light detection capability. Compared with the traditional structure, the light-transmitting component designed by this embodiment can greatly improve the light collection efficiency of the photomultiplier tube 11, increase the sensitivity of the detector and the minimum detection limit.

[0070] In this embodiment, the support tube 80 is made of Bakelite, with a thermal conductivity between 0.15 and 19. The detector body 100 is made of 316 stainless steel, capable of reaching temperatures up to 300°C. The light guide assembly between the detector and the photomultiplier tube 11 utilizes this structural design. Photons are transmitted through a highly transparent quartz light guide rod 8, which has a thermal conductivity of only 1.3 to 1.65 at temperatures ≤300°C. The distance between the detector body 100 and the photomultiplier tube 11 is 30 mm. The high temperature of the detector body 100 is shielded by the highly transparent quartz light guide rod 8 and the Bakelite support tube 80, ensuring that the temperature of the photomultiplier tube 11 remains essentially consistent with the ambient temperature, thus preventing any impact on the accuracy and performance of the photomultiplier tube 11.

[0071] like Figure 2 As shown, a filter 10 is installed in the multiplier tube sleeve 18 and between the photomultiplier tube 11 and the light guide rod 8. Specifically: in this embodiment, the filter 10 is located on the inner side of a connecting sleeve 19 connected to the multiplier tube sleeve 18, and the characteristic photons passing through the light-transmitting component will be filtered by the filter 10.

[0072] In this embodiment, the connecting sleeve 19 is internally threaded with a backing nut 20, and a through hole is coaxially formed in the center of the backing nut 20 to facilitate the passage of characteristic photons for reception by the photomultiplier tube 11. Tightening the backing nut 20 compresses the filter 10, limiting the position of the filter 10 and firmly securing it within the connecting sleeve 19. In this embodiment, sealing rings are provided between the filter 10, the connecting sleeve 19, and the backing nut 20, i.e., sealing rings are provided on both sides of the filter. This prevents damage to the surface of the filter 10 when the backing nut 20 is tightened, while ensuring an airtight seal.

[0073] Combine Figure 6 As shown, a pulsed flame photometry detection device in this embodiment also includes a power supply 405. The power supply 405 uses a 24V DC current and is a high-voltage pulse current (high-voltage microcurrent, with arc 403 energy similar to that of a lighter arc 403). Two sets of igniters 4 are provided, each including a tungsten ignition needle 401 and a sleeve 402. The tungsten ignition needle 401 uses a tungsten electrode used in welding equipment. It has a high melting point, is corrosion-resistant, has a high density, and has good thermal and electrical conductivity. The tungsten ignition needle 401 will not oxidize, age, or corrode, greatly extending its service life.

[0074] The sleeve 402 is installed on the detector body 100, the ignition tungsten needle 401 passes through the sleeve 402, and one end of the ignition tungsten needle 401 is connected to the power supply 405, and the other end of the ignition tungsten needle 401 passes through the sleeve 402 and is located in the ignition chamber 3. The two ignition tungsten needles 401 are located at one end of the ignition chamber 3 and are arranged facing each other.

[0075] In this embodiment, the sleeve 402 includes an inner tube and an outer tube. The inner tube is located inside the outer tube, and the inner tube and the outer tube are coaxially arranged. The ignition tungsten needle 401 passes through the inner tube. In this embodiment, the sleeve 402 and the ignition chamber 3 are both insulating tubes, specifically ceramic tubes, so that the sleeve 402 and the ignition chamber 3 have high insulation and low thermal conductivity, which can avoid reaction with the detector body 100 during ignition.

[0076] Combine Figure 6 As shown, the two groups of igniters 4 are symmetrically arranged on both sides of the ignition chamber 3, and the sleeves in the two groups of igniters 4 are arranged perpendicular to the ignition chamber 3, and the two sleeves 402 are located on the same side. In this way, the ignition tungsten needles 401 in the two groups of igniters 4 can be connected to the power supply 405 on the same side, which simplifies the circuit and facilitates wiring installation.

[0077] Symmetrically arranged through holes are provided on both sides of the upper part of the ignition chamber 3. The ends of the two ignition tungsten needles 401 are respectively inserted into the through holes on both sides of the upper part of the ignition chamber 3 and are located in the ignition chamber 3. The ends of the ignition tungsten needles 401 are L-shaped, so that the ignition tungsten needles 401 can turn and penetrate into the ignition chamber 3 after passing through the inner tube of the sleeve 402.

[0078] Combine Figure 1 and Figure 2 As shown, a mounting cavity 406 is opened in the upper body of the detector body 100, and the upper part of the ignition chamber 3 and one end of the sleeve 402 are both located in the mounting cavity 406. In this embodiment, a connector 60 is detachably connected to the mounting cavity 406. In this embodiment, the connector 60 is threadedly connected to the mounting cavity 406, and the top end of the connector 60 is located above the mounting cavity 406. An exhaust channel 6 is coaxially opened in the connector 60.

[0079] In this embodiment, a flame arrester 5 is installed inside and at the lower part of the connector 60. The flame arrester 5 is clamped in the connector 60 and can block the flame and prevent the flame from being ejected from the exhaust channel 6, thereby ensuring safety.

[0080] In another embodiment, the lower part of the installation cavity 406 is filled with a potting glue 404 for fixing the sleeve 402, the ignition tungsten needle 401 and the ignition chamber 3. The potting slurry can fix the positions of the ignition chamber 3, the sleeve 402 and the ignition tungsten needle 401 to ensure the stability and reliability of the three, and the potting glue 404 can play an insulating role to avoid reaction with the detector body 100 during the ignition process.

[0081] In another embodiment, the end of the ignition needle 401 is a pointed structure, that is, the end of the ignition needle 401 is in a pointed cone shape. The two ends of the ignition needle 401 use a tip pulse discharge mode. The tip discharge has a larger discharge arc 403 area, which can more easily ignite the mixture compared to the hot wire ignition method.

[0082] In the ignition device, by turning on the power supply 405, the two ignition tungsten needles 401 discharge, generating an arc 403, which reacts with the gas in the ignition chamber 3 to produce a flame. The mixture of the measured substance and the hydrogen-rich mixed air in the combustion chamber 1 of the detector body 100 will be ignited by the flame generated in the ignition chamber 3.

[0083] like Figure 7 As shown, in another embodiment, two groups of light-transmitting components are provided, the two groups of light-transmitting components are located in the same plane, and the two groups of light-transmitting components are arranged perpendicular to each other, and each group of light-transmitting components is equipped with a group of signal processing components and a reflector 7; specifically: in this embodiment, the two groups of light-transmitting components are orthogonal at 90 degrees, and the optical paths of the two groups of light-transmitting components are orthogonal at 90 degrees, which avoids the problem of mutual influence of excitation light when the two channels are in a straight line.

[0084] In this embodiment, a cross channel structure is opened on the lower body of the detector body 100, so that two groups of light-transmitting components are vertically installed in two mutually perpendicular installation channels on the detector body 100. At the same time, each group of light-transmitting components is correspondingly provided with a reflector 7, and the two reflectors 7 are installed in the other two mutually perpendicular installation channels.

[0085] The dual-pass optical component in this embodiment improves the ability to collect characteristic photons, can detect two substances at the same time, and effectively improves the detection efficiency. Figure 7 As shown, the dual-pass optical component can collect and analyze the characteristic photons of sulfide and phosphide respectively.

[0086] The specific implementation process is as follows:

[0087] The combustion chamber 1 is filled with hydrogen-rich mixed air through the combustion chamber air inlet pipe 15, the measured substance is filled into the combustion chamber 1 through the sampling tube 14, and the flow cavity 2 is filled with hydrogen-containing air mixture through the ignition chamber air inlet pipe 16. The hydrogen-containing air mixture moves upward and enters the ignition chamber 3 through the air hole 242 on the upper support block 24.

[0088] The power supply 405 is started to ignite the igniter 4, so that the flame in the ignition chamber 3 ignites the mixed gas of the measured substance and the hydrogen-rich mixed air in the combustion chamber 1, thereby generating a flame in the combustion chamber 1.

[0089] During use, the ignition chamber 3 and the gas chamber can be filled with equal proportions of gas through proportional design, so that the gases in the ignition chamber 3 and the gas chamber are burned out at the same time, the flames are extinguished at the same time, and then the mixed gas is filled in and burned again, thereby achieving the effect of flame pulse combustion.

[0090] The substance to be tested is ignited by a hydrogen-rich flame in the combustion chamber 1 and produces chemiluminescence (the wavelength of chemiluminescence produced by different substances is different). The characteristic photons produced by the combustion of the substance to be tested are reflected by the reflector 7 to the light guide rod 8 in the light-passing component for transmission. After the unnecessary photons are filtered out by the filter, they are received by the photomultiplier tube 11 and converted into electrical signals for easy analysis.

[0091] The pulsed flame photometry detection device of the present invention has the following advantages:

[0092] ①Good repeatability:

[0093] The combustion chamber 1 of the present invention has a small volume, so it has a low gas consumption, which makes the dead volume of the detector smaller and the repeatability better.

[0094] ②High sensitivity:

[0095] The pulsed flame photometric detection device of the present invention has a time delay function. It can take advantage of the fact that the emission time of noise characteristic photons is early and short, while the emission time of characteristic photons of the detected substance is late and long. Through the existing delay gate integration method, a large amount of flame background noise can be eliminated, thereby significantly increasing the sensitivity.

[0096] Compared to traditional FPD detectors, the pulsed flame photometric detection device of the present invention has higher light intensity. Because the detector's combustion chamber 1 is small, the required volumes of hydrogen and air are also small. While the amount of the substance being detected is constant, the volume ratio of the substance being detected to the volume of the mixed combustion gas in the combustion chamber 1 is greater than that of traditional FPD detectors. The higher the concentration of the substance being detected, the stronger the luminescence, and the greater the detector's sensitivity.

[0097] ③High selectivity:

[0098] The extremely high selectivity of a pulsed flame photometric detector stems from the added delay of the excitation light emission time of the substance being detected. This allows the characteristic photons of the substance being detected to be easily separated from other noise photons. Therefore, the signals of sulfides, phosphides, or other substances being detected can be isolated through time delay. The PFPD detector in this solution incorporates a time delay function, which allows for significant increases in sensitivity by eliminating significant amounts of background flame noise through delayed gate integration.

[0099] It should be noted that the above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0100] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0101] In the description of this document, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only used to illustrate the relative position relationship between the various components or components, and do not particularly limit the specific installation orientation of the various components or components.

[0102] In the descriptions of this document, some terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0103] In this document, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0104] The structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in this technical briefing document for those skilled in the art to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0105] The terms used in this document are those commonly used in the art currently in consideration of the functions of the present disclosure, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the document should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present disclosure.

[0106] Flowcharts or text are used in this document to illustrate the operational steps performed according to the embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order in which they are described. Instead, the various steps may be processed in reverse order or simultaneously, as needed. Furthermore, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0107] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A pulse flame photometry detection device, characterized in that: It includes a detector body, a combustion chamber, an ignition chamber, a combustion chamber air intake pipe, an ignition chamber air intake pipe, a light transmission component and a signal processing component, and an igniter is installed on the ignition chamber; A flow cavity and an air bleed passage are provided in the detector body, the combustion chamber is installed in the flow cavity, the ignition chamber is installed on the detector body and is located above the combustion chamber, and the air bleed passage is located between the combustion chamber and the ignition chamber and communicates with the combustion chamber and the ignition chamber; An air hole connected to each other is provided between the top wall of the circulation cavity and the air introduction channel, the ignition chamber air inlet pipe is connected to the circulation cavity, the combustion chamber air inlet pipe is connected to the combustion chamber, and the combustion chamber is also connected to a sample injection tube for introducing the substance to be tested; One end of the light-passing component is located in the flow cavity and at one side of the combustion chamber, and the signal processing component is used to collect and receive characteristic photons transmitted in the light-passing component.

2. A pulsed flame photometry detection device according to claim 1, characterized in that: A reflector is arranged directly opposite to the light-passing component. The reflector and the light-passing component are located on two sides of the combustion chamber, and the reflector is mounted on the detector body.

3. A pulsed flame photometry detection device according to claim 1, characterized in that: The signal processing component includes a multiplier tube sleeve and a photomultiplier tube, wherein the photomultiplier tube is located in the multiplier tube sleeve; The light-transmitting component includes a support tube and a light guide rod. The light guide rod is located inside the support tube. Both ends of the support tube are open ends. The two ends of the support tube are respectively connected to the multiplier tube sleeve and the detector body. A filter is installed in the multiplier tube sleeve and between the photomultiplier tube and the light guide rod.

4. A pulsed flame photometry detection device according to claim 3, characterized in that: The light guide rod is a light-transmitting quartz light guide rod, both ends of the light guide rod are polished to form mirror surfaces, and a silver mirror coating is plated on the outer circumference of the light guide rod and the mirror surfaces at both ends.

5. A pulsed flame photometry detection device according to claim 4, characterized in that: The support tube is made of bakelite.

6. A pulsed flame photometry detection device according to claim 1, characterized in that: The bottom of the circulation cavity is connected to an air inlet nozzle, the top of the air inlet nozzle is connected to a lower support block, the top of the circulation cavity is connected to an upper support block, the bottom of the upper support block and the top of the lower support block are both provided with mutually facing slots, the two ends of the combustion chamber are respectively stuck in the slots of the upper support block and the lower support block, and one end of the sample injection tube passes through the air inlet nozzle and the lower support block in sequence to communicate with the combustion chamber; A center hole is provided in the center of the upper support block, and the center hole is communicated with the air inlet channel and the combustion chamber. An annular groove is provided at the top of the upper support block, and a plurality of air holes are provided at the bottom of the annular groove along its circumference, and the air holes are communicated with the flow cavity and the air inlet channel.

7. A pulsed flame photometric detection device according to claim 6, characterized in that: The upper support block and the lower support block are both made of PEEK material, and the combustion chamber is made of quartz material.

8. A pulsed flame photometry detection device according to claim 1, characterized in that: The combustion chamber and the ignition chamber are arranged alternately, and the air induction channel is perpendicular to the ignition chamber and the combustion chamber and is communicated with each other.

9. A pulsed flame photometry detection device according to claim 1, characterized in that: It also includes a power supply, and the igniter is provided with two groups, and the two groups of igniters each include an ignition tungsten needle and a sleeve; The sleeve is installed on the detector body, the ignition tungsten needle passes through the sleeve, and one end of the ignition tungsten needle is connected to the power supply, the other end of the ignition tungsten needle passes through the sleeve and is located in the ignition chamber, and the two ignition tungsten needles are located at one end of the ignition chamber and are arranged opposite to each other.

10. A pulsed flame photometry detection device according to any one of claims 1 to 9, characterized in that: The light-transmitting components are provided in two groups, the two groups of light-transmitting components are located in the same plane, and the two groups of light-transmitting components are arranged perpendicular to each other.

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