Dual-channel pulse flame detector

Abstract

The invention relates to the technical field of pulse flame detectors, and provides a double-channel pulse flame detector which comprises a base, a clamping block is fixedly installed at the upper end of the base, a heating assembly is movably installed at the upper end of the base, and the clamping block is clamped and fixed to the upper end of the heating assembly. A tail gas outlet component is fixedly mounted at the upper end of the heating assembly, the heating assembly comprises a bottom assembly, a rotating assembly and a top assembly, and the bottom assembly is clamped and fixed in a groove in the upper end of the base. By arranging a double-channel flame detector structure with intermittent flame combustion, pulse flame with certain frequency, unique combustion chamber design and unique ignition design, the detector has the effect of not extinguishing fire, the problem that background noise exists in the flame with continuous combustion is solved, the quenching effect is reduced as much as possible, and the flame detection efficiency is improved. A multi-element detection and dual-channel output structure is arranged, element selective detection is achieved, and simultaneous output of S / P, S / C or any two element signals is supported.

Description

Technical Field

[0001] This invention relates to the field of pulse flame detector technology, and more particularly to a dual-channel pulse flame detector. Background Technology

[0002] Existing FPD detectors use continuous flame combustion, which easily generates background noise, causing unwanted interfering photons to be collected in the characteristic light entering the photomultiplier tube. Furthermore, existing FPD detectors have poor sensitivity and low selectivity. The detectors use manual ignition, and cannot automatically ignite when the flame goes out, making continuous flame monitoring impossible. The instrument itself cannot identify or automatically shut off combustible hydrogen, and the detector itself is not explosion-proof. As a result, it is easy to leave no hole unattended, and staff may overlook it or not have time to deal with it in time.

[0003] The decrease in transparency of the quartz tube / window during the long-term operation of a pulse flame detector is unavoidable and is mainly caused by combustion deposits. This directly endangers the accuracy of flame detection and the safety function of the equipment. Regular and standardized cleaning is the most critical and economical maintenance method. When cleaning cannot restore sufficient light transmittance or the quartz itself suffers irreversible damage, it must be replaced in time.

[0004] Therefore, we have made improvements to this by proposing a dual-channel pulse flame detector. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-channel pulse flame detector to solve the problems mentioned in the background art.

[0006] To achieve the aforementioned objectives, this invention provides a dual-channel pulse flame detector, comprising a base, a locking block fixedly mounted on the upper end of the base, a heating assembly movably mounted on the upper end of the base, the locking block clamping and fixing the upper end of the heating assembly, and an exhaust gas outlet component fixedly mounted on the upper end of the heating assembly. The heating assembly includes a bottom assembly, a rotating assembly, and a top assembly. The bottom assembly is snapped and fixed in a groove at the upper end of the base. Both ends of the bottom assembly are connected to PMT photomultiplier tubes via quartz light guides. The rotating assembly is sleeved... The bottom component is connected to the middle of the top component. A combustion component is installed in the middle of the bottom component. A reflector is installed inside the upper end of the combustion component. An ignition chamber is set inside the top component. One side of the ignition chamber is fixedly installed with a platinum alloy ignition wire. The partition between the reflector and the combustion component is the combustion chamber. The upper end of the combustion chamber is connected to the ignition chamber. One side of the base is connected to the combustion chamber air inlet pipe. One side of the bottom component is connected to the ignition chamber air inlet pipe. Both the ignition chamber air inlet pipe and the combustion chamber air inlet pipe are connected and fixed to the combustion component.

[0007] As a further embodiment of the present invention, a quartz light guide tube is connected and installed at the front end of the PMT photomultiplier tube, and heat dissipation fins are provided on the outer side of the quartz light guide tube, and the side wall of the quartz light guide tube is silver-plated.

[0008] As a further embodiment of the present invention, the bottom component includes a first housing, a first mounting chamber is provided in the middle of the first housing, and connection holes are provided on both sides of the first housing. A sliding groove is provided on the outer side wall of the first housing, directly below the connection hole. A cover plate is slidably installed inside the sliding groove. A compression spring is connected between the cover plate and the sliding groove. The cover plate is pushed and pulled to cover the surface of the connection hole. A pointer is fixedly installed at the upper end of the first housing.

[0009] As a further embodiment of the present invention, the rotating assembly includes a second housing, with sealing rings installed at both the upper and lower ends of the second housing, a second mounting chamber opened in the middle of the second housing, and a plurality of detection holes evenly opened around the circumference of the second housing. A filter is installed inside the detection hole, and a thread and a scale are fixedly installed on the upper end of the circumferential surface of the second housing.

[0010] As a further embodiment of the present invention, the top assembly includes a third housing, the interior of which is provided with an air passage, a cross branch is fixedly installed at the bottom end of the air passage, the upper end of the air passage is connected to the exhaust outlet component, and a platinum alloy ignition wire is fixedly installed at one side port of the air passage.

[0011] As a further embodiment of the present invention, the reflective assembly includes a mounting base, a blocking block is fixedly installed at the bottom of the mounting base, a drainage groove is symmetrically opened on the bottom surface of the blocking block, the mounting base is generally hexagonal prism-shaped, mounting holes are opened on all six sides of the mounting base, a reflector is installed on the mounting hole, mounting grooves are opened at the six side ridges of the mounting base, a metal spring is fixedly connected inside the mounting groove, a flexible graphite plate is fixedly connected to the outer end of the metal spring, and the flexible graphite plate is in contact with the inner wall of the combustion assembly.

[0012] As a further embodiment of the present invention, the combustion assembly includes a combustion tube, the bottom end of which is fitted with a metal seat, and the bottom end of the metal seat is fixedly connected with a quartz capillary column.

[0013] As a further embodiment of the present invention, the number of detection holes is six, and six different filters are installed inside the six detection holes.

[0014] The dual-channel pulse flame detector provided by this invention has the following advantages: 1. By setting up a dual-channel flame detector structure with intermittent combustion, a stable low-velocity airflow can form a pulsed flame at a certain frequency. The unique combustion chamber design is more conducive to the detection of trace or minute substances. The unique ignition design ensures that the ignition wire is constantly red-hot for ignition, so the detector has the effect of not extinguishing the flame. At the same time, the pulsed flame solves the problem of background noise in continuous combustion flames, which is beneficial to signal detection. The combustion chamber is filled with a hydrogen-rich / air mixture, which is ignited by the air-rich / hydrogen mixture in the ignition chamber. The hydrogen-rich / air / analyte mixture in the combustion chamber is burned. This structure has the advantages of a dual-flame (DFPD) detector and can minimize the quenching effect.

[0015] 2. Pulse Flame Noise Reduction: By controlling the airflow to form intermittent combustion at 1-10Hz (1-10 ignitions per second), the background noise problem of continuous flames is solved. The flame is extinguished by instantaneous oxygen deprivation after combustion, and the flame is re-ignited after the products are discharged by the airflow, which significantly reduces background interference and improves signal detection sensitivity. The dual-flame structure introduces an air-rich / hydrogen-rich mixture into the ignition chamber, which is ignited by a continuously heated platinum alloy ignition wire to achieve automatic ignition and flame continuity. The combustion chamber is located in the sandwich between the reflector and the combustion component (2-3mm wide), and a hydrogen-rich / air / analyte mixture is introduced and ignited by the flame in the ignition chamber. The hydrogen-rich environment reduces the quenching effect and is suitable for trace substance detection. The combustion chamber has no dead volume (only 37mL) and a low-adsorption quartz tube, which further optimizes the sensitivity.

[0016] The system features a multi-element detection and dual-channel output structure. A rotating filter system integrates six filters covering sulfur, phosphorus, and 26 other elements (such as N2, As, Se, Br, and Cu). Twenty of these elements can avoid interference from the carbon matrix. By rotating the scale to align the connection holes, different filters can be switched, enabling selective element detection. It supports simultaneous output of S / P, S / C, or any two element signals, meeting the needs of composite analysis (such as the synergistic detection of sulfur and phosphorus in environmental monitoring). The combustion and reflective components are fixed by clips and can be disassembled and replaced as a whole, solving the problem of reduced light transmittance caused by quartz cylinder contamination. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a dual-channel pulse flame detector provided in this application; Figure 2 A cross-sectional view of the structure of a dual-channel pulse flame detector provided in this application; Figure 3 A schematic diagram of the heating assembly connection of a dual-channel pulse flame detector provided in this application; Figure 4 A schematic diagram of the top component structure of a dual-channel pulse flame detector provided in this application; Figure 5 A schematic diagram of the rotating assembly structure of a dual-channel pulse flame detector provided in this application; Figure 6 A schematic diagram of the bottom component structure of a dual-channel pulse flame detector provided in this application; Figure 7 A cross-sectional view of the reflector and combustion components of a dual-channel pulse flame detector provided in this application; Figure 8 A schematic diagram of the reflective component structure of a dual-channel pulse flame detector provided in this application; Figure 9 A schematic diagram of the combustion component structure of a dual-channel pulse flame detector provided in this application; Figure 10 A schematic cross-sectional view of the heating component of a dual-channel pulse flame detector provided in this application.

[0019] In the diagram: 1. Base; 2. Heating assembly; 21. Bottom assembly; 211. First housing; 212. First mounting chamber; 213. Connecting hole; 214. Slide groove; 215. Cover plate; 216. Compression spring; 217. Pointer; 22. Rotating assembly; 221. Second housing; 222. Sealing ring; 223. Thread; 224. Scale; 225. Detection hole; 226. Second mounting chamber; 227. Filter; 23. Top assembly; 231. Third housing; 232 1. Air passage; 2. Cross branch; 3. Exhaust outlet component; 4. Platinum alloy ignition wire; 5. PMT photomultiplier tube; 6. Clamping block; 7. Reflector assembly; 71. Mounting base; 72. Block; 73. Drainage groove; 74. Mounting hole; 75. Mounting slot; 76. Reflector; 77. Flexible graphite plate; 78. Metal spring; 8. Combustion assembly; 81. Combustion tube; 82. Metal seat; 83. Quartz capillary column; 9. Ignition chamber intake pipe; 10. Combustion chamber intake pipe. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0021] like Figures 1-10 As shown, this embodiment proposes a dual-channel pulse flame detector, including a base 1. A locking block 6 is fixedly installed on the upper end of the base 1, and a heating component 2 is movably installed on the upper end of the base 1. The locking block 6 clamps and fixes the upper end of the heating component 2. An exhaust gas outlet component 3 is fixedly installed on the upper end of the heating component 2. The heating component 2 includes a bottom component 21, a rotating component 22, and a top component 23. The bottom component 21 is snapped and fixed in a groove at the upper end of the base 1. Both ends of the bottom component 21 are connected to PMT photomultiplier tubes 5 through quartz light guide tubes. The rotating component 22 is sleeved between the bottom component 21 and the top component 23. A combustion component 8 is sleeved in the middle of the bottom component 21. A reflector component 7 is installed inside the upper end of the combustion component 8. An ignition chamber is provided inside the top component 23. One side port of the ignition chamber is fixedly installed with a platinum alloy ignition wire 4. The platinum alloy ignition wire 4 is connected to DC power and is always in a heated state. However, there is no flame. When the carrier gas is premixed with the hydrogen-rich / air mixture in the ignition chamber inlet pipe 9, it enters the quartz combustion chamber and enters the ignition chamber together with the air-rich / hydrogen mixture introduced from the combustion chamber inlet pipe 10. It is ignited and then automatically ignites the mixture in the combustion tube, so that the test component burns and glows in the hydrogen-rich / air flame. After combustion, the flame is extinguished due to instantaneous oxygen deficiency. The continuous airflow continues to enter the combustion chamber to remove the combustion products and repeat the above process for a second ignition. This process is repeated 1-10 times per second, that is, the pulse flame frequency is 1-10Hz. The partition between the reflector 7 and the combustion component 8 is the combustion chamber. The upper end of the combustion chamber is connected to the ignition chamber. One side of the base 1 is connected to the combustion chamber inlet pipe 10, and one side of the bottom component 21 is connected to the ignition chamber inlet pipe 9. The ignition chamber inlet pipe 9 and the combustion chamber inlet pipe 10 are both connected and fixed to the combustion component 8.

[0022] A quartz light guide tube is connected and installed at the front end of the PMT photomultiplier tube 5. The outer side of the quartz light guide tube is equipped with heat dissipation fins, and the side wall of the quartz light guide tube is silver-plated to form an effect similar to optical fiber, which is beneficial to the transmission of light signals.

[0023] The bottom component 21 includes a first housing 211, with a first mounting chamber 212 in the middle. Connection holes 213 are provided on both sides of the first housing 211. A sliding groove 214 is provided on the outer wall of the first housing 211, directly below the connection holes 213. A cover plate 215 is slidably installed inside the sliding groove 214. A compression spring 216 connects the cover plate 215 and the sliding groove 214. The cover plate 215 pushes and pulls to cover the surface of the connection holes 213. A pointer 217 is fixedly installed at the upper end of the first housing 211. The rotating component 22 includes a second housing 221, with sealing rings 222 installed at both the upper and lower ends. A second mounting chamber 226 is provided in the middle of the second housing 221. Multiple detection holes 225 are evenly distributed around the circumference of the second housing 221. A filter 227 is installed inside the detection holes 225. A threaded plate 227 is fixedly installed at the upper end of the circumferential surface of the second housing 221. 23 and scale 224, top component 23 includes third housing 231, the interior of third housing 231 has air passage 232, reflector 7 and combustion component 8 adopt combustion chamber + ignition chamber design structure, both parts are 316SS and stainless steel + high transparency quartz tube, the whole detector is resistant to high temperature and can work in the range of 200-500℃, the ignition chamber is located near the platinum alloy ignition wire 4, the mixed air / hydrogen gas flowing out of the side wall fills the ignition chamber from bottom to top at a certain flow rate, when the mixed gas reaches the ignition wire, it is ignited by the red-hot ignition wire, and then spreads from top to bottom along the ignition chamber channel to the combustion chamber for combustion, the bottom end of air passage 232 is fixedly installed with cross branch 233, the upper end of air passage 232 is connected to exhaust gas outlet component 3, exhaust gas outlet component 3 contains flame arrester, one side port of air passage 232 is fixedly installed with platinum alloy ignition wire 4.

[0024] The reflector assembly 7 includes a mounting base 71, with a blocking block 72 fixedly mounted at the bottom end of the mounting base 71. A drainage groove 73 is symmetrically formed on the bottom surface of the blocking block 72. The mounting base 71 is hexagonal prism in shape, with mounting holes 74 on each of its six sides. A reflector 76 is mounted on each mounting hole 74. Mounting grooves 75 are formed on the six side ridges of the mounting base 71. A metal spring 78 is fixedly connected inside the mounting groove 75, and a flexible graphite plate 77 is fixedly connected to the outer end of the metal spring 78. The flexible graphite plate 77 is in contact with the inner wall of the combustion assembly 8. The flexible graphite plate 77 uses a flexible graphite ring as the main sealing material, possessing self-lubricating properties and a friction coefficient of 0.04~0.1. It can withstand high temperatures up to 3000℃ in a non-oxidizing atmosphere, ensuring sealing to prevent gas leakage or the entry of external contaminants. To avoid scratching or abrading the quartz surface and affecting transparency, a metal spring 78 is connected between the mounting groove 75 and the combustion assembly 8, providing axial elastic compensation for the flexible graphite plate 77, maintaining a constant sealing force, preventing gas diffusion into the other six sides of the mounting base 71 and the partition between the combustion assembly 8, and preventing overpressure from scratching the inner wall of the combustion assembly 8. Meanwhile, flexible graphite rings are used as the main sealing material at other connection points to ensure the seal between the rotating combustion tube 81 and the metal seat 82, preventing gas leakage or the entry of external contaminants. The combustion assembly 8 includes a combustion tube 81, with a metal seat 82 fitted at the bottom end of the combustion tube 81. A quartz capillary column 83 is fixedly connected to the bottom end of the metal seat 82. The combustion chamber is located between the combustion assembly 8 and the reflector 76. Figure 7 The gap width is about 2-3mm as the combustion tube. The analyte is hydrogen-richly combusted in the jacketed tube. The entire combustion chamber has no dead volume. The analyte is loaded in a high-temperature quartz tube with low adsorption. The overall volume of the combustion chamber is 37 ml. The small volume, no dead volume and low adsorption can greatly increase the sensitivity of the detector.

[0025] There are six detection apertures 225, and six different filters 227 are installed inside the six detection apertures 225. The six filters 227 are of different types of filter materials. In addition to detecting sulfur and phosphorus, they can also detect 26 other elements, namely: N2, As, Sn, Se, 1Br, Ga, Ge, Fe, Cu, In, Sb, Al, Bi, Cr, V, Eu, Fe, Ni, Rh, Ru, W, C, Mn, B, Pb, and Si. Among them, except for the last 8 elements, they can achieve high selectivity detection without interference from the carbon matrix. It is not only suitable for the selective detection of sulfur and phosphorus-containing compounds, but also for the selective determination of 28 specific elements. Compared with standard detectors, it can achieve a higher detection limit (10 times), greater selectivity (10-1000), stronger reliability, and lower operating costs. The dual-channel analog output function allows the signals generated by S and P and C or any two elements to be output simultaneously.

[0026] Specifically, in use, this dual-channel pulse flame detector works as follows: the carrier gas enters through the combustion chamber inlet pipe 10 and mixes with the hydrogen-rich / air-rich gas in the ignition chamber inlet pipe 9. The mixture then flows upwards at a certain velocity, filling the partition between the reflector component 7 and the combustion component 8, and continues upwards into the gas channel 232. When the mixed gas reaches the ignition filament, it is ignited by the red-hot filament. The mixture then propagates downwards through the ignition chamber channel into the combustion chamber, where it burns. The analyte undergoes hydrogen-rich combustion within the quartz tube, causing the analyte to burn and emit light in the hydrogen-rich / air flame. After combustion, the flame extinguishes due to instantaneous oxygen deficiency, and the continuous airflow continues. The combustion chamber continues to be ignited, and the combustion products are expelled. The process is repeated for a second ignition. This process is repeated 1-10 times per second, i.e., the pulse flame frequency is 1-10Hz. The combustion chamber is separated from the optical detection system by the combustion component 8 and the reflector component 7. The reflectors 76 on both sides of the reflector component 7 reflect the flame. The light signal passes through the filter 227 and the light guide connected to the connection hole 213, and is received by the PMT photomultiplier tube 5 to generate a signal. The combustion products are discharged from the exhaust outlet 3 through the gas passage 232. The contents not described in detail in this description are existing technologies known to those skilled in the art.

[0027] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A dual-channel pulse flame detector, comprising a base (1), characterized in that: A locking block (6) is fixedly installed on the upper end of the base (1), and a heating component (2) is movably installed on the upper end of the base (1). The locking block (6) clamps and fixes the upper end of the heating component (2). An exhaust gas outlet component (3) is fixedly installed on the upper end of the heating component (2). The heating component (2) includes a bottom component (21), a rotating component (22), and a top component (23). The bottom component (21) is snapped and fixed in the groove at the upper end of the base (1). The two ends of the bottom component (21) are connected to PMT photomultiplier tubes (5) through quartz light guide tubes. The rotating component (22) is sleeved on the bottom component (21) and the top component (23). In the middle, a combustion component (8) is installed in the middle of the bottom component (21). A reflector component (7) is installed inside the upper end of the combustion component (8). An ignition chamber is provided inside the top component (23). One side port of the ignition chamber is fixedly installed with a platinum alloy ignition wire (4). The partition between the reflector component (7) and the combustion component (8) is the combustion chamber. The upper end of the combustion chamber is connected to the ignition chamber. One side of the base (1) is connected to the combustion chamber air inlet pipe (10). One side of the bottom component (21) is connected to the ignition chamber air inlet pipe (9). Both the ignition chamber air inlet pipe (9) and the combustion chamber air inlet pipe (10) are connected and fixed to the combustion component (8).

2. The dual-channel pulse flame detector according to claim 1, characterized in that: The front end of the PMT photomultiplier tube (5) is connected to a quartz light guide tube, which has heat dissipation fins on the outside and silver plating on the side wall.

3. A dual-channel pulse flame detector according to claim 1, characterized in that: The bottom component (21) includes a first housing (211), a first mounting chamber (212) is provided in the middle of the first housing (211), and connection holes (213) are provided on both sides of the first housing (211). A sliding groove (214) is provided on the outer side wall of the first housing (211) directly below the connection hole (213). A cover plate (215) is slidably installed inside the sliding groove (214). A compression spring (216) is connected between the cover plate (215) and the sliding groove (214). The cover plate (215) pushes and pulls to cover the surface of the connection hole (213). A pointer (217) is fixedly installed at the upper end of the first housing (211).

4. A dual-channel pulse flame detector according to claim 3, characterized in that: The rotating assembly (22) includes a second housing (221), with sealing rings (222) installed at both the upper and lower ends of the second housing (221). A second mounting chamber (226) is opened in the middle of the second housing (221). Multiple detection holes (225) are evenly opened around the second housing (221). A filter (227) is installed inside the detection hole (225). A thread (223) and a scale (224) are fixedly installed on the upper end of the circumferential surface of the second housing (221).

5. A dual-channel pulse flame detector according to claim 4, characterized in that: The top assembly (23) includes a third housing (231), inside which an air passage (232) is provided. A cross branch (233) is fixedly installed at the bottom end of the air passage (232). The upper end of the air passage (232) is connected to the exhaust outlet component (3). One side port of the air passage (232) is fixedly installed with a platinum alloy ignition wire (4).

6. A dual-channel pulse flame detector according to claim 1, characterized in that: The reflective assembly (7) includes a mounting base (71), a block (72) is fixedly installed at the bottom of the mounting base (71), and a drainage groove (73) is symmetrically opened on the bottom surface of the block (72). The mounting base (71) is hexagonal prism in shape. Mounting holes (74) are opened on the six sides of the mounting base (71). A reflector (76) is installed on the mounting hole (74). Mounting grooves (75) are opened at the six side ribs of the mounting base (71). A metal spring (78) is fixedly connected inside the mounting groove (75). A flexible graphite plate (77) is fixedly connected to the outer end of the metal spring (78). The flexible graphite plate (77) is in contact with the inner wall of the combustion assembly (8).

7. A dual-channel pulse flame detector according to claim 1, characterized in that: The combustion assembly (8) includes a combustion tube (81), the bottom end of which is fitted with a metal seat (82), and the bottom end of the metal seat (82) is fixedly connected with a quartz capillary column (83).

8. A dual-channel pulse flame detector according to claim 4, characterized in that: The number of detection holes (225) is six, and six different filters (227) are installed inside the six detection holes (225).

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