An ultraviolet fluorescence method sulfur dioxide analyzer

Abstract

The present application relates to the technical fields of sulfur dioxide analyzer, and discloses a kind of ultraviolet fluorescence method sulfur dioxide analyzers, comprising: shell, the both sides of the shell are equipped with heat dissipation hole, the top of the shell is detachably installed with cover plate, the shell is fixedly installed with heat preservation box, the heat preservation box is provided with reaction chamber and heating base, the present application sends sample gas into the heating cavity formed by the outer circumferential surface of heat tracing pipe and first bellow, sample gas flows in heating cavity and constantly hits the tortuous bellow of first bellow, on the one hand, prolongs the residence time of sample gas in heating cavity, on the other hand, forms turbulent flow in bellow, destroys laminar boundary layer, strengthens gas-wall heat exchange, so that sample gas is heated to the temperature matched with reaction chamber before entering reaction chamber, turbulent flow makes sample gas constantly scour the inner wall of first bellow, avoids water droplet to hang and condense on bellow wall surface, reduces the adsorption and residue of sulfur dioxide on pipe wall.

Description

Technical Field

[0001] This invention relates to the field of sulfur dioxide analyzer technology, and specifically to a sulfur dioxide analyzer using ultraviolet fluorescence method. Background Technology

[0002] Generally, an ultraviolet fluorescence sulfur dioxide analyzer is a device used to continuously monitor the concentration of sulfur dioxide in ambient air. During the monitoring process, ambient air needs to be drawn into the instrument through a sampling pipeline and pretreated by dust removal and dehumidification. Then, the sample gas is sent into the reaction chamber and irradiated by a pulsed ultraviolet light source. This causes the sulfur dioxide molecules to absorb ultraviolet light of a specific wavelength and become excited. When the excited sulfur dioxide molecules return to the ground state, they emit fluorescence. The concentration of sulfur dioxide is deduced by detecting the fluorescence intensity, thus realizing continuous online monitoring of sulfur dioxide in ambient air. During sulfur dioxide monitoring, the ambient air contains water vapor, and the humidity fluctuates significantly with the alternation of day and night and seasonal changes. If the sample gas enters the reaction chamber directly, the water vapor will condense into dew on the cooler wall surface. The dew will scatter ultraviolet light and interfere with the acquisition of fluorescence signals. At the same time, sulfur dioxide is a water-soluble gas, and the condensed dew will dissolve the sulfur dioxide in the sample gas, resulting in lower measured values. If the sample gas is dehumidified by refrigeration, it will be cooled to a low temperature before entering the higher-temperature reaction chamber. Although the temperature of the reaction chamber wall is higher than the dew point of the dehumidified sample gas and condensation will not occur, there is a large temperature difference between the low-temperature sample gas and the reaction chamber. Since the fluorescence quantum yield changes with temperature, the temperature fluctuation of the sample gas will cause fluorescence signal drift, resulting in unstable readings. In addition, sulfur dioxide is chemically active and easily adsorbs and remains on the sampling pipeline and the inner wall of the reaction chamber, causing response lag and lower measured values. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an ultraviolet fluorescence sulfur dioxide analyzer to solve the technical problems in the prior art.

[0004] The objective of this invention can be achieved through the following technical solutions: An ultraviolet fluorescence sulfur dioxide analyzer includes: The housing has heat dissipation holes on both sides and a detachable cover plate on the top. An insulation box is fixedly installed inside the housing, containing a reaction chamber and a heating base. The heating base heats the reaction chamber, which is connected to a connecting pipe. A gas sampling pipe runs through one side of the housing, equipped with a filter, fan, and condenser assembly. One end of the gas sampling pipe is located outside the housing, and the other end is connected to a connecting bend via a flange. A heat tracing pipe is installed inside the housing, containing an electric heating wire. A first corrugated pipe is fitted onto the outer surface of the heat tracing pipe, creating a heating cavity between the outer surface of the heat tracing pipe and the first corrugated pipe. One end of the heating cavity is connected to the connecting bend via an inlet pipe, and the other end is connected to the connecting pipe via an outlet pipe.

[0005] As a further aspect of the present invention: a connecting plate is fixedly installed at one end of the first corrugated pipe near the insulation box, an electric cylinder is fixedly installed at the top of the insulation box, a connecting ring is fixedly installed at the movable end of the electric cylinder, the inner wall of the connecting ring is slidably sleeved on the outer circular surface of the connecting plate, and the connecting ring establishes a temporary rigid connection with the connecting plate through a connecting assembly.

[0006] As a further embodiment of the present invention: the connecting assembly includes a slot, a groove, a plug, and a threaded rod. The outer circular surface of the connecting plate has three circumferentially arranged slots, the inner wall of the connecting ring has three circumferentially arranged grooves, the plug is slidably installed in the groove, and the plug is slidably connected to the slot. One end of the threaded rod is rotatably installed on the plug, and the other end of the threaded rod is located outside the connecting ring. The threaded rod is threadedly connected to the connecting ring.

[0007] As a further aspect of the present invention: a first annular plate is fixedly installed on the end of the first corrugated pipe away from the connecting plate, and an air inlet pipe is connected to the first annular plate; a second annular plate is provided on the end of the first corrugated pipe near the connecting plate, and an air outlet pipe is connected to the second annular plate; a second corrugated pipe is fixedly installed on the end of the second annular plate facing the connecting plate, and the second corrugated pipe is fixedly connected to the connecting plate.

[0008] As a further embodiment of the present invention: a first circular plate and a second circular plate are fixedly installed on the outer circular surfaces of both ends of the heat tracing pipe, respectively. A first reserved hole is provided on the first circular plate, and a second screw is fixedly installed on the second circular plate. A first screw is fixedly installed on the first annular plate, and a second reserved hole is provided on the second annular plate. The first screw passes through the first reserved hole and is fastened by a nut, and the second screw passes through the second reserved hole and is fastened by a nut.

[0009] As a further aspect of the present invention: a first sealing ring is provided on the side of the first circular plate facing the first annular plate, and a second sealing ring is provided on the side of the second circular plate facing the second annular plate.

[0010] As a further aspect of the present invention: the minimum radius of the first annular plate is not less than the maximum radius of the second circular plate.

[0011] As a further embodiment of the present invention: a sliding frame is slidably installed inside the housing, the heat tracing pipe is fixedly installed on the sliding frame, the air outlet pipe and the connecting pipe are connected by a flange, and the air inlet pipe and the connecting bend pipe are connected by a flange.

[0012] The beneficial effects of this invention are: 1. In this invention, external gas is filtered and dust-removed by a filter nozzle and condensed and dehumidified by a condensation component by a fan. Then, it is sent into the heating chamber formed by the outer circular surface of the heat tracing pipe and the first corrugated pipe through a connecting bend and an air inlet pipe. The electric heating wire in the heat tracing pipe is energized and heated. When the sample gas flows in the heating chamber, it continuously impacts the tortuous corrugations of the first corrugated pipe. On the one hand, this prolongs the residence time of the sample gas in the heating chamber. On the other hand, it forms turbulence at the corrugations, destroys the laminar boundary layer, and enhances gas-wall heat transfer. This allows the sample gas to be rapidly and uniformly heated to a temperature matching the reaction chamber before entering the reaction chamber. This avoids the problem of temperature difference caused by the low-temperature sample gas directly entering the high-temperature reaction chamber after cooling and dehumidification, which leads to fluorescence signal drift and unstable readings. At the same time, the turbulence causes the sample gas to continuously flush the inner wall of the first corrugated pipe, preventing water droplets from adhering and condensing on the corrugated pipe wall, reducing the adsorption and residue of sulfur dioxide on the pipe wall, and ensuring the stability of the fluorescence signal and measurement accuracy. 2. In this invention, the connecting ring is driven to move by an electric cylinder. The connecting ring drives the connecting plate to move synchronously through the connecting assembly, thereby causing one end of the first corrugated pipe to axially extend and retract, changing the degree of curvature of the first corrugated pipe. This allows the first corrugated pipe to switch between smooth and tortuous states. In summer or when the ambient temperature is high during the day, the first corrugated pipe tends to be smoother, reducing turbulence and heating. In winter or when the ambient temperature is low at night, the first corrugated pipe becomes more tortuous, extending the residence time and enhancing turbulence, thus improving heating efficiency. This avoids the problems of traditional heating devices operating at a fixed power, insufficient preheating in winter, or overheating in summer, which cause fluctuations in sample gas temperature. It achieves adaptive adjustment of heating power according to environmental conditions, ensuring stable sample gas temperature before entering the reaction chamber while significantly reducing energy consumption. 3. In this invention, the threaded rod and connecting ring are connected to drive the insert block into the slot of the connecting plate, establishing a temporary rigid connection between the connecting plate and the connecting ring. Combined with the modular assembly structure of the first screw and the first reserved hole, the second screw and the second reserved hole, the dimensional relationship that the minimum radius of the first annular plate is not less than the maximum radius of the second circular plate, the sliding clearance of the sliding frame, and the detachable flange connection, the first bellows can be quickly disassembled and extracted as a whole for cleaning and maintenance. This avoids the problems of long-term dirt accumulation on the inner wall of the bellows leading to decreased turbulence and heat exchange effects, and the damage to components caused by forced disassembly in a confined space. Simultaneously, the first and second sealing rings are deformed under pressure to fill the gap between the mating surfaces, preventing sample gas leakage along the connecting seam in the heating chamber, ensuring that the sample gas enters the reaction chamber along the predetermined flow path, improving measurement stability and reducing maintenance costs. Attached Figure Description

[0013] The invention will now be further described with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the shell in this invention; Figure 3 This is a cross-sectional structural schematic diagram of the heat preservation box in this invention; Figure 4 This is a schematic diagram of the cross-sectional view of the first bellows in this invention; Figure 5 This is a schematic diagram of the heat tracing pipe in this invention; Figure 6 In this invention Figure 4 Enlarged structural diagram of section A; Figure 7 In this invention Figure 4 Enlarged structural diagram of section B; Figure 8 In this invention Figure 4 An enlarged structural diagram of section C.

[0015] In the diagram: 1. Shell; 2. Heat dissipation hole; 3. Cover plate; 4. Insulation box; 5. Reaction chamber; 501. Connecting pipe; 6. Heating base; 7. Heat tracing pipe; 8. Electric heating wire; 9. First corrugated pipe; 901. Inlet pipe; 902. Outlet pipe; 10. Gas sampling pipe; 11. Filter nozzle; 12. Fan; 13. Condensation assembly; 14. Connecting bend; 15. First circular plate; 1501. First reserved hole; 1502. First... 16. Sealing ring; 17. Second circular plate; 18. Second screw; 19. Second sealing ring; 10. First annular plate; 11. First screw; 12. Second annular plate; 13. Second reserved hole; 14. Connecting plate; 15. Slot; 26. Second bellows; 27. Connecting ring; 28. Slide groove; 29. ​​Electric cylinder; 20. Insert block; 21. Threaded rod; 22. Sliding frame; 23. Heating chamber. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-8 As shown, the present invention is an ultraviolet fluorescence sulfur dioxide analyzer, comprising: A housing 1 has heat dissipation holes 2 on both sides. A cover plate 3 is detachably installed on the top of the housing 1. An insulation box 4 is fixedly installed inside the housing 1. A reaction chamber 5 and a heating base 6 are arranged inside the insulation box 4. The heating base 6 is used to heat the reaction chamber 5. The reaction chamber 5 is connected to a connecting pipe 501. A gas sampling pipe 10 is arranged through one side of the housing 1. A filter nozzle 11, a fan 12 and a condenser assembly 13 are arranged on the gas sampling pipe 10. One end of the gas sampling pipe 10... Located outside the housing 1, the other end of the gas sampling pipe 10 is connected to a connecting bend 14 via a flange. A heat tracing pipe 7 is provided inside the housing 1. An electric heating wire 8 is fixedly installed inside the heat tracing pipe 7. A first corrugated pipe 9 is sleeved on the outer circular surface of the heat tracing pipe 7. A heating cavity 26 exists between the outer circular surface of the heat tracing pipe 7 and the first corrugated pipe 9. One end of the heating cavity 26 is connected to the connecting bend 14 via an air inlet pipe 901, and the other end of the heating cavity 26 is connected to the connecting pipe 501 via an air outlet pipe 902.

[0018] The working principle of this invention is as follows: First, the reaction chamber 5 is heated by the heating base 6 to maintain the temperature inside the reaction chamber 5 within a constant temperature range suitable for normal operation. Simultaneously, the heat dissipation holes 2 on both sides of the shell 1 are used for ventilation and heat dissipation inside the shell 1. Then, the fan 12 is started, and the external gas sequentially passes through the filter nozzle 11 on the gas sampling pipe 10 for dust removal, and the condensation assembly 13 for condensation and dehumidification, before entering the heating chamber 26 through the connecting bend 14 and the inlet pipe 901. Because the electric heating wire 8 inside the heat tracing pipe 7 is energized, the heat tracing pipe 7 heats the sample gas in the heating chamber 26, and the heating chamber 26 is formed by the outer surface of the heat tracing pipe 7 and the first... The sample gas is enclosed by a corrugated pipe 9. As the sample gas flows within the heating chamber 26, it continuously impacts the tortuous corrugations of the first corrugated pipe 9. This prolongs the residence time of the sample gas within the heating chamber 26 and creates turbulence at the corrugations, disrupting the laminar boundary layer and enhancing gas-wall heat transfer. This allows the sample gas to heat up rapidly and uniformly. Simultaneously, the turbulence continuously washes the inner wall of the first corrugated pipe 9, preventing water droplets from adhering to and condensing on the corrugated pipe wall. The heated sample gas then enters the connecting pipe 501 through the outlet pipe 902 and finally enters the reaction chamber 5. Under constant temperature conditions, ultraviolet fluorescence detection is performed, enabling continuous online monitoring of sulfur dioxide concentration.

[0019] like Figures 1-4 As shown, in a preferred embodiment of the present invention, a connecting plate 19 is fixedly installed at one end of the first corrugated pipe 9 near the heat preservation box 4, an electric cylinder 22 is fixedly installed on the top of the heat preservation box 4, a connecting ring 21 is fixedly installed at the movable end of the electric cylinder 22, the inner wall of the connecting ring 21 is slidably sleeved on the outer circular surface of the connecting plate 19, and the connecting ring 21 establishes a temporary rigid connection with the connecting plate 19 through a connecting assembly.

[0020] In one embodiment, the electric cylinder 22 may be an electric telescopic rod or other components, or other mechanisms capable of lifting and lowering. This embodiment does not impose specific limitations on these components.

[0021] In practical application, the electric cylinder 22 drives the connecting ring 21 to move. The connecting ring 21 drives the connecting plate 19 to move synchronously via the connecting assembly, thereby causing one end of the first corrugated pipe 9 to axially extend and retract, thus changing the degree of tortuosity of the first corrugated pipe 9, making it smoother or more tortuous to adapt to different heating requirements: for example, in summer or when the ambient temperature is high during the day, the first corrugated pipe 9 is made to be smoother to reduce turbulence and heating, and avoid overheating of the sample gas; conversely, in winter or when the ambient temperature is low at night, the first corrugated pipe 9 is made more tortuous to prolong the residence time of the sample gas and enhance turbulence, thereby improving heating efficiency and realizing adaptive adjustment of the heating power according to the environmental conditions, which not only ensures the temperature of the sample gas is stable before entering the reaction chamber 5, but also reduces energy consumption.

[0022] Expand upon the six embodiments section by section according to your format (without parentheses and numbering), adding details of motion, physical mechanisms, and problem-solving logic: like Figures 1-8 As shown, in a preferred embodiment of the present invention, the connecting assembly includes a slot 1901, a groove 2101, a plug 23, and a threaded rod 24. The outer circular surface of the connecting plate 19 has three circumferentially arranged slots 1901, and the inner wall of the connecting ring 21 has three circumferentially arranged grooves 2101. The plug 23 is slidably installed in the groove 2101 and is slidably connected to the slot 1901. One end of the threaded rod 24 is rotatably installed on the plug 23, and the other end of the threaded rod 24 is located outside the connecting ring 21. The threaded rod 24 is threadedly connected to the connecting ring 21.

[0023] In practical application, when the connecting ring 21 is fitted onto the outer surface of the connecting plate 19, the sliding groove 2101 aligns with the slot 1901. The three slots 1901 are evenly distributed along the circumference of the connecting plate 19, which can simultaneously constrain the relative position of the connecting ring 21 and the connecting plate 19 from three directions, avoiding force skew and swaying of the connecting ring 21 caused by a single-point connection. Subsequently, the threaded rod 24 is manually rotated. Since the threaded rod 24 is threadedly connected to the connecting ring 21, the threaded rod 24 moves axially when it rotates, causing the insert 23 to move synchronously. When the insert 23 is inserted into the slot 1901, a part of the insert 23 is still located in the sliding groove 2101. Block 23 spans both the slide groove 2101 and the slot 1901, thereby establishing a temporary rigid connection between the connecting plate 19 and the connecting ring 21. At this time, the driving force of the electric cylinder 22 can be reliably transmitted to the connecting plate 19 through the connecting ring 21 and the insert block 23, causing the first bellows 9 to extend and retract without loosening the connection. When it is necessary to disconnect, the threaded rod 24 is rotated in the opposite direction to make the insert block 23 exit the slot 1901, realizing a quick switch between connection and separation. This can be done without special tools, facilitating the extension and retraction adjustment and disassembly and maintenance of the first bellows 9, while avoiding the problems of difficult disassembly and high maintenance costs caused by long-term welding or bolt fixing.

[0024] like Figures 1-7 As shown, in a preferred embodiment of the present invention, a first annular plate 17 is fixedly installed on the end of the first corrugated pipe 9 away from the connecting plate 19, and an air inlet pipe 901 is connected to the first annular plate 17. A second annular plate 18 is provided on the end of the first corrugated pipe 9 near the connecting plate 19, and an air outlet pipe 902 is connected to the second annular plate 18. A second corrugated pipe 20 is fixedly installed on the end of the second annular plate 18 facing the connecting plate 19, and the second corrugated pipe 20 is fixedly connected to the connecting plate 19.

[0025] In practical application, the connecting plate 19 connects the first corrugated pipe 9 and the second corrugated pipe 20 simultaneously, forming a double-layer corrugated pipe structure. When the connecting plate 19 moves, causing the first corrugated pipe 9 to extend and retract axially, the second corrugated pipe 20 is simultaneously extended and retracted. The two layers of corrugated pipes seal the boundaries of the heating chamber 26 from both ends, thereby ensuring the sealing of the heating chamber 26. Even if the first corrugated pipe 9 changes its tortuosity due to axial extension and retraction, the heating chamber 26 still completely encloses the heat tracing pipe 7, and there will be no gaps that could lead to sample gas leakage or external air infiltration. Due to the first annular plate The positions of 17 and the second annular plate 18 remain unchanged. The flow path of the sample gas entering the heating chamber 26 through the inlet pipe 901 and leaving the heating chamber 26 through the outlet pipe 902 remains stable, and the heating range remains unchanged. The only change is the degree of tortuosity of the first bellows 9. Thus, the turbulence intensity and residence time of the sample gas in the heating chamber 26 can be flexibly adjusted by the axial movement of the first bellows 9, so as to achieve stepless adjustment of heating efficiency. This ensures the reliable sealing of the gas path during the extension and retraction adjustment process and avoids the problem of uneven heating of the sample gas caused by changes in the heating range.

[0026] like Figures 4-7 As shown, in a preferred embodiment of the present invention, a first circular plate 15 and a second circular plate 16 are fixedly installed on the outer surfaces of both ends of the heat tracing pipe 7, respectively. A first reserved hole 1501 is provided on the first circular plate 15, and a second screw 1601 is fixedly installed on the second circular plate 16. A first screw 1701 is fixedly installed on the first annular plate 17, and a second reserved hole 1801 is provided on the second annular plate 18. The first screw 1701 passes through the first reserved hole 1501 and is fastened by a nut, and the second screw 1601 passes through the second reserved hole 1801 and is fastened by a nut.

[0027] In practical application, this embodiment utilizes the through-fitting of the first screw 1701 with the first reserved hole 1501 and the through-fitting of the second screw 1601 with the second reserved hole 1801 to sequentially install and fix the first corrugated pipe 9 and the first annular plates 17 and 1801 at both ends, as well as the circular plates at both ends of the heat tracing pipe 7. During assembly, the first annular plate 17 is first fitted onto one end of the heat tracing pipe 7, and the first screw 1701 is passed through the first reserved hole 1501 and pre-tightened with a nut. Then, the second screw 1601 is... The annular plate 18 is fitted onto the other end of the heat tracing pipe 7, and the second screw 1601 is tightened after passing through the second reserved hole 1801. This achieves modular assembly with gradual positioning and point-by-point tightening at both ends, ensuring the coaxiality of the first corrugated pipe 9 and the heat tracing pipe 7. During disassembly, the first corrugated pipe 9 can be removed as a whole for cleaning by unscrewing the nuts at both ends. This facilitates maintenance and avoids long-term accumulation of dirt on the inner wall of the corrugations, which can block the troughs and damage the turbulence structure. This ensures long-term stability of the turbulence and heat exchange effect, while reducing the cost of replacing the corrugated pipe.

[0028] like Figures 4-7As shown, in a preferred embodiment of the present invention, a first sealing ring 1502 is provided on the side of the first circular plate 15 facing the first annular plate 17, and a second sealing ring 1602 is provided on the side of the second circular plate 16 facing the second annular plate 18.

[0029] In practical application, the first sealing ring 1502 and the second sealing ring 1602 undergo elastic deformation under the assembly compression, filling the microscopic gaps between the mating surfaces and playing a sealing role. On the one hand, this prevents the sample gas in the heating chamber 26 from leaking outward along the connection gap, avoiding sample gas loss that could cause measurement deviation and heat loss. On the other hand, it prevents ambient air in the shell 1 from seeping into the heating chamber 26 through the connection gap, diluting the sample gas and causing the measured sulfur dioxide concentration to be too low or the measurement results to be distorted. At the same time, the sealing ring can also absorb the small vibrations and thermal expansion and contraction displacement during the assembly process, ensuring that the sample gas enters the reaction chamber 5 completely through the outlet pipe 902 along the predetermined flow path, thereby improving the reliability and long-term stability of the measurement data.

[0030] like Figures 4-7 As shown, in a preferred embodiment of the present invention, the minimum radius of the first annular plate 17 is not less than the maximum radius of the second circular plate 16.

[0031] In practical application, since the minimum radius of the first annular plate 17 is not less than the maximum radius of the second circular plate 16, when disassembling the first corrugated pipe 9, the first annular plate 17 can smoothly pass through the location of the second circular plate 16, allowing the first corrugated pipe 9 and the annular plates at both ends to be pulled out as a whole along the axial direction of the heat tracing pipe 7. This avoids jamming due to radial interference between the first annular plate 17 and the second circular plate 16, thus preventing problems such as corrugated pipe deformation, sealing ring damage, or heat tracing pipe 7 bending caused by forceful application during disassembly. This achieves rapid and non-destructive disassembly, creating conditions for subsequent cleaning, maintenance, and repair.

[0032] like Figures 2-5 As shown, in a preferred embodiment of the present invention, a sliding frame 25 is slidably installed inside the housing 1, the heat tracing pipe 7 is fixedly installed on the sliding frame 25, the air outlet pipe 902 is flange-connected to the connecting pipe 501, and the air inlet pipe 901 is flange-connected to the connecting bend pipe 14.

[0033] In practical application, when disassembling the first corrugated pipe 9, the flange connection between the outlet pipe 902 and the connecting pipe 501, and between the inlet pipe 901 and the connecting bend pipe 14 are first disconnected, thus disconnecting the air path between the heat tracing pipe 7 and the insulation box 4 and the gas sampling pipe 10. Then, the sliding frame 25 is moved to allow the heat tracing pipe 7 to slide away from the insulation box 4, providing sufficient operating space for the extraction of the first corrugated pipe 9. Since the flange connection is detachable, the first corrugated pipe 9 can be completely removed for cleaning or replacement after the repositioning is completed. After maintenance, the sliding frame 25 is moved in the opposite direction to reset the heat tracing pipe 7, and the flange can be reconnected to restore its use. The entire disassembly and assembly process does not require the heat tracing pipe 7 to be completely removed from the housing 1, which ensures the convenience of disassembly operation and avoids the corrugated pipe being squeezed and deformed or the pipe joints being damaged due to forced disassembly and assembly in a confined space, thus shortening maintenance time and reducing maintenance difficulty.

[0034] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A sulfur dioxide analyzer using ultraviolet fluorescence method, characterized in that, include: A housing (1) has heat dissipation holes (2) on both sides. A cover plate (3) is detachably installed on the top of the housing (1). A heat preservation box (4) is fixedly installed inside the housing (1). A reaction chamber (5) and a heating base (6) are provided inside the heat preservation box (4). The heating base (6) is used to heat the reaction chamber (5). The reaction chamber (5) is connected to a connecting pipe (501). A gas sampling pipe (10) is installed through one side of the housing (1). A filter nozzle (11), a fan (12), and a condenser assembly (13) are provided on the gas sampling pipe (10). One end of the gas sampling pipe (10) is located outside the shell (1), and the other end of the gas sampling pipe (10) is connected to the connecting bend pipe (14) through a flange. A heat tracing pipe (7) is provided inside the shell (1), and an electric heating wire (8) is fixedly installed inside the heat tracing pipe (7). A first corrugated pipe (9) is sleeved on the outer circle of the heat tracing pipe (7). There is a heating cavity (26) between the outer circle of the heat tracing pipe (7) and the first corrugated pipe (9). One end of the heating cavity (26) is connected to the connecting bend pipe (14) through the air inlet pipe (901), and the other end of the heating cavity (26) is connected to the connecting pipe (501) through the air outlet pipe (902).

2. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 1, characterized in that, A connecting plate (19) is fixedly installed at one end of the first corrugated pipe (9) near the heat preservation box (4). An electric cylinder (22) is fixedly installed on the top of the heat preservation box (4). A connecting ring (21) is fixedly installed at the movable end of the electric cylinder (22). The inner wall of the connecting ring (21) is slidably sleeved on the outer circular surface of the connecting plate (19). The connecting ring (21) establishes a temporary rigid connection with the connecting plate (19) through the connecting assembly.

3. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 2, characterized in that, The connecting assembly includes a slot (1901), a groove (2101), a plug (23), and a threaded rod (24). The outer surface of the connecting plate (19) has three circumferentially arranged slots (1901). The inner wall of the connecting ring (21) has three circumferentially arranged grooves (2101). The plug (23) is slidably installed in the groove (2101) and slidably connected to the slot (1901). One end of the threaded rod (24) is rotatably installed on the plug (23), and the other end of the threaded rod (24) is located outside the connecting ring (21). The threaded rod (24) is threadedly connected to the connecting ring (21).

4. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 2, characterized in that, A first annular plate (17) is fixedly installed on the end of the first corrugated pipe (9) away from the connecting plate (19). An air inlet pipe (901) is connected to the first annular plate (17). A second annular plate (18) is provided on the end of the first corrugated pipe (9) near the connecting plate (19). An air outlet pipe (902) is connected to the second annular plate (18). A second corrugated pipe (20) is fixedly installed on the end of the second annular plate (18) facing the connecting plate (19). The second corrugated pipe (20) is fixedly connected to the connecting plate (19).

5. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 4, characterized in that, The outer surfaces of the two ends of the heat tracing pipe (7) are respectively fixedly installed with a first circular plate (15) and a second circular plate (16). The first circular plate (15) has a first reserved hole (1501), and the second circular plate (16) has a second screw (1601) fixedly installed. The first annular plate (17) has a first screw (1701) fixedly installed, and the second annular plate (18) has a second reserved hole (1801). The first screw (1701) passes through the first reserved hole (1501) and is fastened by a nut, and the second screw (1601) passes through the second reserved hole (1801) and is fastened by a nut.

6. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 5, characterized in that, The first circular plate (15) is provided with a first sealing ring (1502) on the side facing the first annular plate (17), and the second circular plate (16) is provided with a second sealing ring (1602) on the side facing the second annular plate (18).

7. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 6, characterized in that, The minimum radius of the first annular plate (17) is not less than the maximum radius of the second circular plate (16).

8. The ultraviolet fluorescence sulfur dioxide analyzer according to claim 5, characterized in that, A sliding frame (25) is slidably installed inside the housing (1), and the heat tracing pipe (7) is fixedly installed on the sliding frame (25). The air outlet pipe (902) and the connecting pipe (501) are connected by a flange, and the air inlet pipe (901) and the connecting bend pipe (14) are connected by a flange.

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