High-efficiency sulfur trioxide form conversion pretreatment device and detection method

Abstract

This invention discloses a high-efficiency sulfur trioxide form conversion pretreatment device and detection method. The high-efficiency sulfur trioxide form conversion pretreatment device includes a first heating component, a sampling tube, an adsorption element, and a second heating component. The sampling tube is disposed within the first heating component, which heats the sampling tube to a first preset temperature to vaporize the water in the sample gas, thereby separating the water and sulfuric acid in the sample gas. The adsorption element is disposed within the sampling tube and adsorbs the sulfuric acid in the sample gas, thereby separating the sulfuric acid and water vapor in the sample gas. The second heating component is disposed within the adsorption element and heats the adsorption element to a second preset temperature, thereby decomposing the sulfuric acid in the adsorption element into sulfur trioxide and water. The high-efficiency sulfur trioxide form conversion pretreatment device of this invention has the advantages of simple structure, low cost, and high conversion efficiency.

Description

Technical Field

[0001] This invention relates to the field of boiler flue gas composition detection, specifically to a high-efficiency sulfur trioxide form conversion pretreatment device and detection method. Background Technology

[0002] In recent years, in order to alleviate environmental pressure and control and reduce the emission of various pollutants, my country's nitrogen oxide emission control standards for coal-fired power units have been increasingly strict. Denitrification technology has been widely adopted in thermal power units. Among them, selective catalytic reduction (SCR) technology has the highest denitrification efficiency and has become the preferred choice for efficient control of nitrogen oxide emissions.

[0003] In related technologies, detecting the sulfur content in boiler flue gas is cumbersome and the results are inaccurate. Summary of the Invention

[0004] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0005] In related technologies, the concentration of sulfur trioxide in the sample gas is very low compared to sulfur dioxide and water vapor. The spectrum of sulfur trioxide in the mid-infrared band overlaps significantly with that of sulfur dioxide and water vapor. In actual field conditions, the concentration of water vapor is relatively high. This limits the direct measurement of sulfur trioxide in the sample gas using optical methods. Furthermore, sulfur trioxide and water vapor in the sample gas readily react to form sulfuric acid. When the flue gas temperature drops to the acid dew point, the sulfuric acid vapor will condense, leading to lower measurement results.

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a simple and accurate high-efficiency sulfur trioxide speciation pretreatment device.

[0007] This invention provides a detection method that is accurate and simple to follow.

[0008] The sulfur trioxide high-efficiency form conversion pretreatment device of this invention includes: a first heating component and a sampling tube, wherein the sampling tube is disposed within the first heating component, and the first heating component is used to heat the sampling tube to a first preset temperature to vaporize the water in the sample gas within the sampling tube, so as to separate the water and sulfuric acid in the sample gas; an adsorption element disposed within the sampling tube, wherein the adsorption element is used to adsorb sulfuric acid in the sample gas, so as to separate the sulfuric acid and water vapor in the sample gas; and a second heating component disposed within the adsorption element, wherein the second heating component is used to heat the adsorption element to a second preset temperature, so as to decompose the sulfuric acid in the adsorption element into sulfur trioxide and water.

[0009] The sulfur trioxide high-efficiency form conversion pretreatment device of this invention is equipped with a first heating component, a sampling tube, an adsorption component and a second heating component, thereby removing water vapor from the sample gas and decomposing sulfuric acid into sulfur trioxide, avoiding interference from water vapor in the measurement, and improving the accuracy of the detection results of sulfur content in the sample gas.

[0010] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device further includes: a mounting base, on which the first heating component is disposed; a first mounting member, on which the first mounting member is disposed, and which is axially spaced opposite to one end of the sampling tube along the axial direction of the sampling tube, the first mounting member having a first mounting groove extending through the first mounting member along the axial direction of the sampling tube, to facilitate a heat tracing pipe passing through the first mounting groove and communicating with one end of the sampling tube; and a second mounting member, on which the second mounting member is disposed, and which is axially spaced opposite to the other end of the sampling tube along the axial direction of the sampling tube, the second mounting member having a second mounting groove extending through the second mounting member along the axial direction of the sampling tube, to facilitate a heat tracing pipe passing through the second mounting groove and communicating with the other end of the sampling tube.

[0011] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device further includes a support frame, which is mounted on the mounting base. The outer peripheral surface of the first heating component is provided with a through hole extending axially along the sampling tube. The support frame passes through the through hole and is connected to the sampling tube so that the sampling tube is located inside the first heating component.

[0012] In some embodiments, the sampling tube includes a first segment, a second segment, and a third segment connected to each other. The first segment, the second segment, and the third segment are all disposed within the first heating assembly. The second heating assembly and the adsorption element are disposed within the second segment. In the shadow plane orthogonal to the axial direction of the sampling tube, the first segment and the third segment are both located within the second segment.

[0013] In some embodiments, the first heating component is a heating coil, and the sampling tube is disposed inside the heating coil.

[0014] In some embodiments, the second heating assembly includes an iron core and an electromagnetic coil, the iron core being disposed within the adsorption member and the electromagnetic coil being sleeved on the outer periphery of the sampling tube.

[0015] In some embodiments, the second heating assembly further includes a protective sleeve disposed on the outer peripheral surface of the iron core and located within the adsorption member.

[0016] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device further includes a detection component disposed within the first heating component to detect the temperature within the first heating component.

[0017] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device further includes a temperature controller and a solid-state relay, both of which are connected to the first heating component.

[0018] The method for detecting sulfur trioxide in a sample gas according to an embodiment of the present invention includes: S1: heating the sample gas to vaporize the water in the sample gas; S2: passing the sample gas into asbestos, whereby the sulfuric acid in the sample gas is adsorbed into the asbestos, so that the sulfuric acid and water in the sample gas are separated; S3: heating the asbestos to above 800°C, so that the sulfuric acid is decomposed into water and sulfur trioxide; S4: detecting the concentration of sulfur trioxide using an optical measuring instrument. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the high-efficiency sulfur trioxide form conversion pretreatment device according to an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the first heating component of the high-efficiency sulfur trioxide form conversion pretreatment device according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the first heating component of the high-efficiency sulfur trioxide form conversion pretreatment device according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the second heating component of the sulfur trioxide high-efficiency form conversion pretreatment device according to an embodiment of the present invention.

[0023] Figure label:

[0024] 100 High-efficiency sulfur trioxide form conversion pretreatment device;

[0025] First heating component 1; through hole 11;

[0026] Sampling tube 2; First section 21; Second section 22; Third section 23;

[0027] Adsorption component 3;

[0028] Second heating component 4; iron core 41; electromagnetic coil 42; protective sleeve 43;

[0029] Mounting base 5; Part 1 51; Part 2 52; Part 3 53;

[0030] First mounting component 6; Second mounting component 7; Support frame 8; First support frame 81; Second support frame 82; Detection assembly 9; First detection assembly 91; Second detection assembly 92;

[0031] Temperature controller 10; solid-state relay 11; relay board 12. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following describes an embodiment of the sulfur trioxide high-efficiency form conversion pretreatment apparatus according to the present invention with reference to the accompanying drawings.

[0034] like Figure 1-4 As shown, the sulfur trioxide high-efficiency form conversion pretreatment device of this invention includes a first heating component 1, a sampling tube 2, an adsorption component 3, and a second heating component 4.

[0035] The sampling tube 2 is disposed within the first heating assembly 1. The first heating assembly 1 is used to heat the sampling tube 2 to a first preset temperature to vaporize the water in the sample gas within the sampling tube 2, so that the water and sulfuric acid in the sample gas are separated. Specifically, as shown... Figure 1-2 As shown, the sampling tube 2 is a quartz tube and is located inside the first heating component 1. The sampling tube 2 is heated to a first preset temperature of 110℃-120℃ by the first heating component 1. Since the boiling point of water is around 100℃ and the boiling point of sulfuric acid is 130℃-140℃, the water in the sample gas can be completely vaporized by the first heating component 1. By using the difference in boiling points between water and sulfuric acid, the sulfuric acid and water in the sample gas are separated into gas and liquid.

[0036] Adsorbent 3 is installed inside sampling tube 2. Adsorbent 3 is used to adsorb sulfuric acid in the sample gas, so as to separate sulfuric acid and water vapor in the sample gas. Specifically, as shown... Figure 1-2 As shown, the adsorbent 3 can be asbestos, and the adsorbent 3 is filled in the sampling tube 2. The sulfuric acid in the sample gas is adsorbed in the adsorbent 3 by the asbestos, and the water vapor in the sample gas cannot be adsorbed in the adsorbent 3, thus separating the water vapor and sulfuric acid in the sample gas and removing the water vapor in the sample gas.

[0037] The second heating component 4 is disposed inside the adsorption element 3. The second heating component 4 is used to heat the adsorption element 3 to a second preset temperature so that the sulfuric acid inside the adsorption element 3 is decomposed into sulfur trioxide and water. Specifically, as shown in the figure... Figure 1-2As shown, the adsorbent 3 is wrapped around the outer periphery of the second heating component 4. After the water vapor in the sample gas is removed, the second heating component 4 is turned on and heats the adsorbent 3 to a second preset temperature, which is above 800°C. This causes the sulfuric acid to decompose into a small amount of gaseous water and sulfur trioxide under high temperature. Since the content of water vapor after decomposition is low, it will not affect the detection results of the optical measuring instrument.

[0038] The sulfur trioxide high-efficiency form conversion pretreatment device 100 according to an embodiment of the present invention is provided with a first heating component 1, a sampling tube 2, and an adsorption element 3. It can utilize the different boiling points of water and sulfuric acid to separate the sample gas into high-purity sulfuric acid and water vapor. Then, the adsorption property of the adsorption element 3 is used to remove a large amount of water vapor from the sample gas. In addition, a second heating component 4 is provided so that sulfuric acid is decomposed into sulfur trioxide and a small amount of water vapor at high temperature. This can ensure efficient form conversion of sulfuric acid and sulfur trioxide in the sample gas, prevent excessive water vapor from interfering with the measurement of sulfur content, and ensure the accuracy of spectral measurement.

[0039] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device 100 further includes a mounting base 5, a first mounting member 6, and a second mounting member 7.

[0040] The first heating component 1 is mounted on the mounting base 5. Specifically, as shown... Figure 1 As shown, the mounting base 5 is divided into a first part 51, a second part 52 and a third part 53 connected in sequence. The first heating component 1, the sampling tube 2, the adsorption component 3 and the second heating component 4 are all located in the first part 51.

[0041] The first mounting component 6 is mounted on the mounting base 5, and the first mounting component 6 and one end of the sampling tube 2 are aligned along the axial direction of the sampling tube 2 (e.g., ...). Figure 1 The two parts are arranged at intervals (as shown in the left and right directions). The first mounting part 6 has a first mounting groove (not shown in the figure) that passes through the first mounting part 6 along the axial direction of the sampling tube 2, so as to facilitate the heat tracing tube to pass through the first mounting groove and communicate with one end of the sampling tube 2.

[0042] Specifically, such as Figure 1As shown, the left end of the sampling tube 2 is the sample gas inlet, and the right end of the sampling tube 2 is the sample gas outlet. The first mounting member 6 is installed on the left end face of the mounting base 5, and the first mounting member 6 is provided with a first mounting groove that runs through the first mounting member 6 in the left-right direction. The heat tracing pipe can be installed in the first mounting groove, so that the heat tracing pipe is installed on the mounting base 5 through the first mounting member 6. The left end of the heat tracing pipe is connected to the boiler, and the right end of the heat tracing pipe is connected to the sample gas inlet of the sampling tube 2, so that the sample gas in the boiler is transported to the sampling tube 2 through the heat tracing pipe. Thus, the first mounting member 6 not only provides an installation base for the heat tracing pipe, but also prevents the heat tracing pipe from falling off during use. In addition, the first mounting member 6 and the sample gas inlet of the sampling tube 2 are spaced apart in the left-right direction, which can prevent the heat generated by the first heating component 1 from being transferred to the first mounting member 6, thereby preventing the heat generated by the first heating component 1 from being lost, and also preventing the user from accidentally touching the first mounting member 6 during the use of the sulfur trioxide high-efficiency form conversion pretreatment device 100, which could lead to a safety accident.

[0043] The second mounting member 7 is disposed on the mounting base 5. The second mounting member 7 and the other end of the sampling tube 2 are spaced apart and opposite to each other along the axial direction of the sampling tube 2. The second mounting member 7 has a second mounting groove (not shown in the figure) that passes through the second mounting member 7 along the axial direction of the sampling tube 2, so as to facilitate the heat tracing pipe passing through the second mounting groove and communicating with the other end of the sampling tube 2. Specifically, as shown in the figure... Figure 1 As shown, the second mounting component 7 is located on the right side of the mounting base 5, and the second mounting component 7 has a second mounting groove that runs through it in the left-right direction. The heat tracing pipe can be inserted into the second mounting groove, thereby installing the heat tracing pipe on the mounting base 5 through the second mounting component 7. The left end of the heat tracing pipe is connected to the sample gas outlet of the sampling tube 2, and the right end of the heat tracing pipe is connected to the optical measuring instrument, so that sulfur trioxide is transported to the optical measuring instrument through the heat tracing pipe. The optical measuring instrument detects the sulfur content in the sulfur trioxide. Thus, the second mounting component 7 not only provides a mounting base for the heat tracing pipe, but also prevents the heat tracing pipe from falling off during use. In addition, the second mounting component 7 and the sample gas outlet of the sampling tube 2 are spaced apart in the left-right direction, which can prevent the heat generated by the second heating component 4 from being transferred to the second mounting component 7, thereby preventing the heat generated by the second heating component 4 from being lost. It also prevents the user from accidentally touching the second mounting component 7 during the use of the sulfur trioxide high-efficiency form conversion pretreatment device 100, which could lead to a safety accident.

[0044] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device 100 further includes a support frame 8, which is mounted on a mounting base 5. A through hole 11 extending axially along the sampling tube 2 is provided on the outer peripheral surface of the first heating component 1. The support frame 8 passes through the through hole 11 and is connected to the sampling tube 2 so that the sampling tube 2 is housed within the first heating component 1. Specifically, as shown in 1 and 3, a through hole 11 penetrating the first heating component 1 is provided on the rear side surface of the first heating component 1. One end of the support frame 8 is fixed to the mounting base 5 by fasteners, and the other end of the support frame 8 is provided with a mounting hole penetrating the support frame 8 in a left-right direction. The sampling tube 2 passes through the mounting hole, thereby installing the sampling tube 2 within the first heating component 1 via the support frame 8. This not only provides a mounting base for the sampling tube 2 but also ensures that the outer peripheral surface of the sampling tube 2 and the inner peripheral surface of the first heating component 1 are spaced apart, preventing the sampling tube 2 from contacting and being damaged by the first heating component 1.

[0045] In some embodiments, the sampling tube 2 includes a first segment 21, a second segment 22, and a third segment 23 connected to each other. The second heating assembly 4 and the adsorption member 3 are disposed within the second segment 22. The first segment 21, the second segment 22, and the third segment 23 are all disposed within the first heating assembly 1. In a projection plane orthogonal to the axial direction of the sampling tube 2, the first segment 21 and the third segment 23 are both located within the second segment 22. Specifically, as shown... Figure 2 and Figure 4 As shown, the first segment 21 is located at the left end of the second segment 22, and the third segment 23 is located at the right end of the second segment 22. The sample gas inlet is located at the left end of the first segment 21, and the sample gas outlet is located at the right end of the third segment 23. The cross-sectional area of ​​the inner circumferential surface of the second segment 22 is larger than the cross-sectional area of ​​the first segment 21 and the cross-sectional area of ​​the second segment 22. The second heating component 4 and the adsorbent 3 are located inside the second segment 22, thereby preventing the second heating component 4 and the adsorbent 3 from shaking inside the sampling tube 2 and improving the stability of the second heating component 4 and the adsorbent 3.

[0046] In some embodiments, the support frame 8 includes a first support frame 81 and a second support frame 82. Both the first support frame 81 and the second support frame 82 are mounted on the mounting base 5. The first support frame 81 has a first mounting hole (not shown in the figure) that extends through the first support frame 81 in the left-right direction. The second support frame 82 has a second mounting hole (not shown in the figure) that extends through the second support frame 82 in the left-right direction. A first segment 21 passes through the first mounting hole, and a third segment 23 passes through the second mounting hole, thereby installing the sampling tube 2 in the first heating assembly 1 through the first support frame 81 and the second support frame 82.

[0047] In some embodiments, the first heating component 1 is a heating coil, and the sampling tube 2 is disposed inside the heating coil. The second heating component 4 includes an iron core 41 and an electromagnetic coil 42. The iron core 41 is disposed inside the adsorption member 3, and the electromagnetic coil 42 is sleeved on the outer periphery of the sampling tube 2. Thus, the sampling tube 2 is heated by the heating coil, and the alternating magnetic field generated by the electromagnetic coil 42 is used to cut the alternating magnetic field lines on the surface of the iron rod, thereby rapidly heating the iron rod to 800°C, reducing the heating time of the second heating component 4, and improving the cracking efficiency of sulfuric acid.

[0048] It is understood that the first heating component 1 and the second heating component 4 can also be any one of an electromagnetic heater, a resistance heater, and an infrared heater.

[0049] Since sulfuric acid is corrosive and can corrode the iron core 41, in some embodiments, the second heating assembly 4 further includes a protective sleeve 43, which is disposed on the outer peripheral surface of the iron core 41 and located inside the adsorption member 3. Specifically, as... Figure 2 As shown, the protective sleeve 43 is a quartz tube, which prevents sulfuric acid from corroding the iron core 41, extends the service life of the second heating component 4, and ensures the heating efficiency of the second heating component 4.

[0050] Quartz tubes possess advantages such as good thermal stability, high light transmittance, high temperature resistance, and corrosion resistance. Therefore, in some embodiments, both the sampling tube 2 and the protective sleeve 43 are quartz tubes. This prevents the sampling tube 2 from being corroded by sulfuric acid and from being damaged in high-temperature environments, thereby extending the service life of both the sampling tube 2 and the protective sleeve 43.

[0051] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device 100 further includes a detection component 9, which is disposed within the first heating component 1 to detect the temperature within the first heating component 1. Thus, by detecting the heating temperature of the first heating component 1 through the detection component 9, it prevents the heating temperature of the first heating component 1 from falling below a first preset temperature, which would prevent water vapor in the sample gas from vaporizing, or prevents the heating temperature generated by the first heating component 1 from being far higher than the first preset temperature, which would cause sulfuric acid in the sample gas to vaporize. Therefore, the detection component 9 performs real-time monitoring of the first heating component 1, ensuring the heating efficiency of the first heating component 1.

[0052] In some embodiments, the detection component 9 includes a first detection component 91 and a second detection component 92. The first detection component 91 is disposed on the first support frame 81 and located inside the first heating component 1, and the second detection component 92 is disposed on the second support frame 82 and located inside the first heating component 1. The temperature inside the first heating component 1 is detected by the first detection component 91 and the second detection component 92. During use, one of the first detection component 91 and the second detection component 92 can be operated while the other is turned off. When one of the first detection component 91 and the second detection component 92 is damaged, the other starts to work, thus ensuring the working efficiency of the first detection component 91 and the second detection component 92.

[0053] It is understandable that there is no limit to the number of detection components 9, and one or more can be set according to the selection. There is also no limit to the position of the detection components 9. The detection components 9 can be set in the middle of the first heating component 1 or at both ends of the first detection component 91.

[0054] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device 100 further includes a temperature controller 10 and a solid-state relay 11, both of which are connected to the first heating component 1. Thus, the temperature controller controls the first heating component 1 to heat to a first preset temperature. When the first heating component 1 reaches the first preset temperature, the solid-state relay 11 immediately operates to cut off the power supply, causing the first heating component 1 to stop working. Therefore, the temperature controller 10 and the solid-state relay 11 achieve precise control of the first preset temperature at 120°C.

[0055] In some embodiments, the sulfur trioxide high-efficiency form conversion pretreatment device 100 further includes a relay plate 12, which is connected to the electromagnetic coil 42 of the second heating component 4. The relay plate 12 is switched on and off in the time domain, so that the electromagnetic coil 42 generates an alternating magnetic field. The iron rod surface cuts the alternating magnetic field lines to heat the iron rod, so that the second heating component 4 can reach 800°C in a short time.

[0056] In some embodiments, the thermostat 10 and the solid-state relay 11 are located in the third part 53 of the mounting base 5, and the relay board 12 is located in the second part 52 of the mounting base 5, which improves the space utilization of the mounting base 5 and makes it convenient for users to replace and disassemble the thermostat 10, the solid-state relay 11 and the relay board 12.

[0057] The working process of this invention embodiment is as follows:

[0058] The first heating component 1 is turned on, and the first heating component 1 heats the sampling tube 2 to the first preset temperature. Sample gas is introduced into the sampling tube 2. Based on the difference in boiling points of sulfuric acid and water vapor in the sample gas, the flue gas is separated into sulfuric acid and water vapor. The separated high-purity sulfuric acid is adsorbed on the adsorbent 3. The sulfuric acid in the adsorbent 3 is then heated at high temperature by the second heating component 4. The sulfur trioxide and a small amount of water vapor are instantly decomposed at high temperature by the time-domain controlled electromagnetic heating system. Finally, inert gas is introduced into the sampling tube 2, and the sulfur trioxide in the sampling tube 2 is loaded into the optical measuring instrument, which can realize high-precision measurement of sulfur trioxide.

[0059] The method for detecting sulfur trioxide in sample gas according to an embodiment of the present invention includes:

[0060] S1: Heating the sample gas to vaporize the water in it. Specifically, the sample gas is introduced into an environment at 120°C, so that the water in the sample gas is in a gaseous state and the sulfuric acid in the sample gas is in a liquid state.

[0061] S2: The sample gas is passed into the asbestos. The sulfuric acid in the sample gas is adsorbed inside the asbestos, thus separating the sulfuric acid and water in the sample gas. Specifically, when the sample gas is passed into the asbestos, the sulfuric acid in the sample gas will be adsorbed by the asbestos, and the water vapor in the sample gas will be blown out of the asbestos with the airflow, thereby separating the sulfuric acid and water vapor in the sample gas.

[0062] S3: Heating the asbestos to above 800°C to decompose the sulfuric acid into water and sulfur trioxide. The asbestos, after absorbing sulfuric acid, is heated to above 800°C, causing the sulfuric acid in the asbestos to decompose into sulfur trioxide and water vapor. The decomposed sulfur trioxide and water vapor are then introduced into the detection device by passing an inert gas through the gas.

[0063] S4: The concentration of sulfur trioxide is detected using an optical measuring instrument. Specifically, the optical measuring instrument uses the QCL-TDLAS measurement method to measure the sulfur trioxide content in the sample gas.

[0064] The detection method of this invention includes steps S1, S2, S3, and S4, which remove a large amount of water vapor from the sample gas, thereby improving the accuracy and reliability of the detection results.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-efficiency sulfur trioxide form conversion pretreatment device, characterized in that, include: A first heating component and a sampling tube, wherein the first heating component is a heating coil and the sampling tube is disposed inside the heating coil, the first heating component is used to heat the sampling tube to a first preset temperature to vaporize the water in the sample gas in the sampling tube so that the water and sulfuric acid in the sample gas are separated into gas and liquid, the first preset temperature being 110℃-120℃; An adsorbent is disposed inside the sampling tube. The adsorbent is used to adsorb sulfuric acid in the sample gas in order to separate sulfuric acid and water vapor in the sample gas. The adsorbent is asbestos. The second heating assembly includes an iron core, an electromagnetic coil, and a protective sleeve. The iron core is disposed inside the adsorption element, the electromagnetic coil is sleeved on the outer periphery of the sampling tube, and the protective sleeve is disposed on the outer periphery of the iron core and located inside the adsorption element. The second heating assembly is used to heat the adsorption element to a second preset temperature so that the sulfuric acid inside the adsorption element decomposes into sulfur trioxide and water. The second preset temperature is above 800°C. Mounting base, the first heating component is mounted on the mounting base; A first mounting component is disposed on the mounting base. The first mounting component and one end of the sampling tube are spaced apart and opposite to each other along the axial direction of the sampling tube. The first mounting component has a first mounting groove that passes through the first mounting component along the axial direction of the sampling tube, so as to facilitate the heat tracing tube passing through the first mounting groove and communicating with one end of the sampling tube. The second mounting member is disposed on the mounting base. The second mounting member and the other end of the sampling tube are spaced apart and opposite to each other along the axial direction of the sampling tube. The second mounting member has a second mounting groove that passes through the second mounting member along the axial direction of the sampling tube, so as to facilitate the heat tracing tube passing through the second mounting groove and communicating with the other end of the sampling tube. A support frame is provided on the mounting base. The outer peripheral surface of the first heating component is provided with a through hole extending along the axial direction of the sampling tube. The support frame passes through the through hole and is connected to the sampling tube so that the sampling tube is disposed inside the first heating component. The sampling tube includes a first segment, a second segment, and a third segment connected to each other. The first segment, the second segment, and the third segment are all located within the first heating assembly. The second heating assembly and the adsorption element are both located within the second segment. In a projection plane orthogonal to the axis of the sampling tube, the first segment and the third segment are both located within the second segment.

2. The high-efficiency sulfur trioxide form conversion pretreatment device according to claim 1, characterized in that, It also includes a detection component, which is disposed within the first heating component to detect the temperature within the first heating component.

3. The high-efficiency sulfur trioxide form conversion pretreatment device according to claim 1, characterized in that, It also includes a thermostat and a solid-state relay, both of which are connected to the first heating component.

4. A method for detecting sulfur trioxide in sample gas using the high-efficiency sulfur trioxide form conversion pretreatment device as described in any one of claims 1-3, characterized in that, include: S1: Pass the sample gas into an environment with a temperature of 120℃ to heat the sample gas and vaporize the water in the sample gas; S2: The sample gas is passed into the asbestos, and the sulfuric acid in the sample gas is adsorbed into the asbestos so that the sulfuric acid and water in the sample gas are separated. S3: Heat the asbestos to above 800°C so that the sulfuric acid decomposes into water and sulfur trioxide; S4: The concentration of sulfur trioxide is detected using an optical measuring instrument.

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