Online laser analyzer

Abstract

The utility model relates to the technical field of natural gas purification, in particular to an online laser analyzer. The online laser analyzer comprises a transmitting assembly, a receiving assembly, a gas pipe, a first corrugated pipe, a second corrugated pipe and a first heat tracing pipe. The transmitting assembly is used for transmitting laser, and the receiving assembly is used for receiving laser. The gas pipe is arranged between the transmitting assembly and the receiving assembly and used for circulating to-be-detected gas. The first corrugated pipe is connected between the transmitting assembly and the air pipe, the second corrugated pipe is connected between the air pipe and the receiving assembly, and laser transmitted by the transmitting assembly is transmitted to the receiving assembly through the first corrugated pipe, the air pipe and the second corrugated pipe. The first heat tracing pipe is connected between the first corrugated pipe and the air pipe and allows laser to pass through, and the first heat tracing pipe can be heated to enable the temperature in the first heat tracing pipe to be higher than the melting point of sulfur. The first heat tracing pipe can be heated to be higher than the melting point of the solid elemental sulfur, so that sulfur steam and liquid sulfur can be prevented from being solidified in the first heat tracing pipe to form the solid elemental sulfur and depositing.

Description

Technical Field

[0001] This utility model relates to the field of natural gas purification technology, and in particular to an online laser analyzer. Background Technology

[0002] In the sulfur recovery process of natural gas purification technology, the sulfur recovery process gas of the Claus process mainly includes carbon dioxide, oxygen, sulfur dioxide, hydrogen sulfide, sulfur vapor, and a small amount of liquid sulfur. Quantitative analysis of these gas components is of great significance for the development of natural gas, the improvement of sulfur recovery rate, and the realization of green, sustainable and high-quality development of traditional petrochemical industry.

[0003] In related technologies, sulfur vapor and liquid sulfur carried by the process gas may be cooled and further deposited as solid elemental sulfur in a pipe located on one side of the transmitting component. The deposition of solid elemental sulfur will block the measurement optical path, making it impossible for the receiving component to receive the light source signal, which will reduce the detection sensitivity of the oxygen analyzer, or even cause the oxygen analyzer to stop working completely. Utility Model Content

[0004] This invention provides an online laser analyzer to prevent sulfur vapor and liquid flow from cooling and depositing as solid elemental sulfur in a pipe located on one side of the emission component.

[0005] This utility model provides an online laser analyzer, comprising:

[0006] The emitting component is used to emit a laser.

[0007] A receiving component, the receiving component being used to receive the laser;

[0008] A gas tube is disposed between the transmitting component and the receiving component, and the gas tube is used to circulate the gas to be tested.

[0009] A first bellows, the first bellows being connected between the launching assembly and the air tube;

[0010] A second corrugated pipe is connected between the air tube and the receiving component. The laser emitted by the transmitting component is transmitted to the receiving component via the first corrugated pipe, the air tube, and the second corrugated pipe.

[0011] The first heat tracing pipe is connected between the first corrugated pipe and the gas pipe and allows the laser to pass through. The first heat tracing pipe can raise the temperature and make the temperature inside the first heat tracing pipe higher than the melting point of sulfur.

[0012] In some embodiments, the first heat tracing pipe is provided with a first hollow cavity and a first interlayer cavity. The first hollow cavity is for the laser to pass through, and the first interlayer cavity is located outside the first hollow cavity. The first interlayer cavity can be filled with steam to raise the temperature of the first hollow cavity above the melting point of sulfur.

[0013] In some embodiments, a first steam flange is also included, which is connected between the first bellows and the first heat tracing pipe. The first steam flange is provided with a first air inlet and a first air outlet, both of which are connected to the first interlayer cavity. The steam is input into the first interlayer cavity through the first air inlet and output through the first air outlet.

[0014] In some embodiments, a first root valve is also included, which is connected between the first bellows and the first steam flange. The first root valve is selectively opened or closed to connect or disconnect the first bellows from the first heat tracing pipe.

[0015] In some embodiments, a first transition member is also included, which is connected between the transmitting assembly and the first bellows. The first transition member is provided with a first nitrogen port, which is used to input nitrogen gas to purge the gas pipe with nitrogen gas from the first heat tracing pipe.

[0016] In some embodiments, a second heat tracing tube is also included, which is connected between the gas pipe and the receiving component to allow the laser to pass through. The second heat tracing tube is capable of heating up and raising the temperature inside the second heat tracing tube to be higher than the melting point of sulfur.

[0017] In some embodiments, the second heat tracing pipe is provided with a second hollow cavity and a second interlayer cavity. The second hollow cavity is for the laser to pass through, and the second interlayer cavity is located outside the second hollow cavity. The second interlayer cavity can be filled with steam to raise the temperature of the second hollow cavity above the melting point of sulfur.

[0018] In some embodiments, a second steam flange is also included, which is connected between the receiving component and the second heat tracing pipe. The second steam flange is provided with a second air inlet and a second air outlet, both of which are connected to the second interlayer cavity. The steam is input into the second interlayer cavity through the second air inlet and output through the second air outlet.

[0019] In some embodiments, a second root valve is also included, which is connected between the second bellows and the second steam flange. The second root valve is selectively opened or closed to connect or disconnect the second heat tracing pipe from the second bellows.

[0020] In some embodiments, a second transition member is also included, which is connected between the receiving component and the second bellows. The second transition member is provided with a second nitrogen port for inputting nitrogen gas to purge the gas pipe by the second heat tracing pipe.

[0021] This application provides an online laser analyzer, which, compared with the prior art, has at least the following advantages:

[0022] The first heat tracing tube can raise the temperature so that the temperature inside the first heat tracing tube is higher than the melting point of solid sulfur. This prevents sulfur vapor and liquid sulfur from condensing and depositing solid sulfur inside the first heat tracing tube, thus avoiding solid sulfur from hindering the laser. Attached Figure Description

[0023] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the online laser analyzer provided in the embodiments of this application;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0027] Figure label:

[0028] 1-Online laser analyzer;

[0029] 11- Launching components;

[0030] 12-Receiver component;

[0031] 13-Trachea;

[0032] 141 - First corrugated pipe; 142 - Second corrugated pipe;

[0033] 151-First heat tracing pipe; 1511-First hollow cavity; 1512-First interlayer cavity; 152-Second heat tracing pipe; 1521-Second hollow cavity; 1522-Second interlayer cavity;

[0034] 161-First steam flange; 1611-First air inlet; 1612-First air outlet; 162-Second steam flange; 1621-Second air inlet; 1622-Second air outlet;

[0035] 171 - First root valve; 172 - Second root valve;

[0036] 181-First transition piece; 1811-First nitrogen port; 182-Second transition piece; 1821-Second nitrogen port;

[0037] 191 - First optical window; 192 - Second optical window. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In this application, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0041] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0042] Please see Figure 1 This application provides an online laser analyzer 1, including a transmitting component 11, a receiving component 12, a gas pipe 13, a first corrugated pipe 141, a second corrugated pipe 142, and a first heat tracing pipe 151. The transmitting component 11 is used to emit laser light, and the receiving component 12 is used to receive laser light. The gas pipe 13 is disposed between the transmitting component 11 and the receiving component 12, and the gas pipe 13 is used to circulate the gas to be tested. The first corrugated pipe 141 is connected between the transmitting component 11 and the gas pipe 13, and the second corrugated pipe 142 is connected between the gas pipe 13 and the receiving component 12. The laser light emitted by the transmitting component 11 is directed to the receiving component 12 via the first corrugated pipe 141, the gas pipe 13, and the second corrugated pipe 142. The first heat tracing pipe 151 is connected between the first corrugated pipe 141 and the gas pipe 13 and allows the laser light to pass through. The first heat tracing pipe 151 can be heated so that the temperature inside the first heat tracing pipe 151 is higher than the melting point of sulfur.

[0043] The first heat tracing pipe 151 and the gas pipe 13 can be connected by welding.

[0044] In addition, after the laser enters the trachea 13, it can analyze the gas to be tested inside the trachea 13, for example, it can determine the oxygen concentration of the gas to be tested.

[0045] It is understood that the gas to be tested in the gas pipe 13 contains sulfur vapor and liquid. Since the first heat tracing pipe 151 is connected to the gas pipe 13, the gas to be tested will also enter the first heat tracing pipe 151. If the temperature inside the first heat tracing pipe 151 is lower than the melting point of elemental sulfur (for example, the melting point of solid sulfur-orthorhombic sulfur is approximately 112.8°C, and the melting point of rhombic sulfur is approximately 118°C), then the sulfur vapor and liquid sulfur will condense inside the first heat tracing pipe 151 to form solid elemental sulfur and deposit there. As more and more solid elemental sulfur is deposited inside the first heat tracing pipe 151, it may block the laser emitted by the emitting component 11, thereby affecting the online laser analyzer 1. To solve this problem, in this embodiment, the first heat tracing pipe 151 can be heated to a temperature higher than the melting point of solid elemental sulfur, thereby preventing sulfur vapor and liquid sulfur from condensing inside the first heat tracing pipe 151 to form solid elemental sulfur and deposit there, thus avoiding solid elemental sulfur from obstructing the laser.

[0046] For example, the temperature inside the first heat tracing pipe 151 can be set at 150°C, which is much higher than the melting point of solid sulfur, thereby preventing sulfur vapor and liquid sulfur inside the first heat tracing pipe 151 from forming solid sulfur.

[0047] In some embodiments, the online laser analyzer 1 may further include a first optical window 191, which is connected between the transmitting component 11 and the first heat tracing pipe 151. A corrugated pipe 141 is mounted on the passage of the first optical window 191, and the first corrugated pipe 141 can dissipate heat from the first optical window 191 and also protect it. In addition, the first corrugated pipe 141 can also adjust the alignment of the transmitting component 11 and the receiving component 12, reducing the error of the analyzer in oxygen content analysis and improving the analytical sensitivity of the online laser analyzer 1.

[0048] Please continue reading. Figure 1 In some embodiments, the online laser analyzer 1 further includes a first transition member 181, which is connected between the emitting assembly 11 and the first bellows 141. The first transition member 181 is provided with a first nitrogen port 1811, which is used to input nitrogen gas for nitrogen purging from the first heat tracing pipe 151 to the gas pipe 13.

[0049] Nitrogen gas enters the first transition member 181 through the first nitrogen port 1811 and is blown in the direction of the gas pipe 13. Nitrogen gas can not only protect the first optical window 191, but also blow sulfur vapor and liquid sulfur in the first heat tracing pipe 151 into the gas pipe 13. Combined with the temperature in the first heat tracing pipe 151, it can further prevent sulfur vapor and liquid sulfur from solidifying into solid sulfur in the first heat tracing pipe 151.

[0050] Please refer to the following: Figure 1 and Figure 2 In some embodiments, the first heat tracing pipe 151 is provided with a first hollow cavity 1511 and a first interlayer cavity 1512. The first hollow cavity 1511 is for laser to pass through, and the first interlayer cavity 1512 is disposed outside the first hollow cavity 1511. Steam can be introduced into the first interlayer cavity 1512 to raise the temperature of the first hollow cavity 1511 to above the melting point of sulfur.

[0051] In this embodiment, the first hollow cavity 1511 is connected to the gas pipe 13, and high-temperature steam is introduced into the first interlayer cavity 1512. The high-temperature steam heats and keeps the first hollow cavity 1511 warm, which can ensure that the temperature of the first hollow cavity 1511 is continuously higher than that of solid sulfur, thereby preventing sulfur vapor and liquid sulfur from condensing and forming solid sulfur in the first hollow cavity 1511 and depositing.

[0052] For example, the high-temperature steam in the first interlayer can ensure that the temperature in the first hollow cavity 1511 is maintained at about 150°C, which is much higher than the melting point of solid sulfur, thereby preventing sulfur vapor and liquid sulfur in the first hollow cavity 1511 from forming solid sulfur.

[0053] The first hollow cavity 1511 is heated and kept warm by using high-temperature steam, which ensures that the heating and insulation process uses non-toxic and non-polluting media. Furthermore, the high-temperature steam used to heat and keep warm the first hollow cavity 1511 can be recycled, which is beneficial to environmental protection and resource recycling.

[0054] Please continue reading. Figure 1 and Figure 2 In some embodiments, the online laser analyzer 1 further includes a first steam flange 161, which is connected between the first bellows 141 and the first heat tracing pipe 151. The first steam flange 161 is provided with a first air inlet 1611 and a first air outlet 1612. Both the first air inlet 1611 and the first air outlet 1612 are connected to the first interlayer cavity 1512. Steam is input into the first interlayer cavity 1512 through the first air inlet 1611 and output through the first air outlet 1612.

[0055] The first heat tracing pipe 151 can be connected to the first steam flange 161 by welding.

[0056] In this embodiment, high-temperature steam is input into the first interlayer cavity 1512 of the first heat tracing pipe 151 through the first air inlet 1611. After the first interlayer cavity 1512 is filled with high-temperature steam, the high-temperature steam is output from the first air outlet 1612. This can achieve a dynamic balance between the flow rate of the high-temperature steam input through the first air inlet 1611 and the flow rate of the high-temperature steam output through the first air outlet 1612. This can ensure that the temperature of the first hollow cavity 1511 is continuously higher than that of solid sulfur, thereby preventing sulfur vapor and liquid sulfur from condensing and depositing as solid sulfur in the first hollow cavity 1511.

[0057] In some embodiments, the orientation of the first air inlet 1611 may be opposite to the orientation of the first air outlet 1612.

[0058] Please refer to it again. Figure 1 In some embodiments, the online laser analyzer 1 further includes a first root valve 171, which is connected between the first bellows 141 and the first steam flange 161. The first root valve 171 selectively opens or closes to connect or disconnect the first bellows 141 from the first heat tracing pipe 151.

[0059] In this embodiment, when it is necessary to inspect and maintain one side of the emitting component 11 of the online laser analyzer 1, the first root valve 171 can be closed to disconnect the first corrugated pipe 141 from the first heat tracing pipe 151, thereby isolating the air pipe 13 from the emitting component 11 side, which is beneficial to ensuring the safety of maintenance personnel; when the online laser analyzer 1 is working, the first root valve 171 can be opened to connect the first corrugated pipe 141 with the first heat tracing pipe 151, so that the laser emitted by the emitting component 11 can pass through the first corrugated pipe 141 and the first heat tracing pipe 151 in sequence and enter the air pipe 13.

[0060] Please continue reading. Figure 1 In some embodiments, the online laser analyzer 1 further includes a second heat tracing tube 152, which is connected between the gas pipe 13 and the receiving component 12 for the laser to pass through. The second heat tracing tube 152 is capable of heating up and making the temperature inside the second heat tracing tube 152 higher than the melting point of sulfur.

[0061] Similarly, the gas to be tested in the gas pipe 13 contains sulfur vapor and liquid. Since the second heat tracing pipe 152 is connected to the gas pipe 13, the gas to be tested will also enter the second heat tracing pipe 152. If the temperature inside the second heat tracing pipe 152 is lower than the melting point of elemental sulfur (for example, the melting point of solid sulfur-orthorhombic sulfur is approximately 112.8°C, and the melting point of rhombic sulfur is approximately 118°C), the sulfur vapor and liquid sulfur will condense inside the second heat tracing pipe 152 to form solid elemental sulfur and deposit it. As more and more solid elemental sulfur is deposited inside the second heat tracing pipe 152, it may block the laser emitted by the emitting component 11, thereby affecting the online laser analyzer 1. To solve this problem, the second heat tracing pipe 152 in this embodiment can be heated to a temperature higher than the melting point of solid elemental sulfur, thereby preventing sulfur vapor and liquid sulfur from condensing inside the second heat tracing pipe 152 to form solid elemental sulfur and depositing it, thus avoiding solid elemental sulfur from obstructing the laser.

[0062] For example, the temperature inside the second heat tracing pipe 152 can be set at 150°C, which is much higher than the melting point of solid sulfur, thereby preventing sulfur vapor and liquid sulfur inside the second heat tracing pipe 152 from forming solid sulfur.

[0063] In some embodiments, the online laser analyzer 1 may further include a second optical window 192, which is connected between the second heat tracing pipe 152 and the receiving component 12. A corrugated pipe 142 is mounted on the passage of the second optical window 192, and the second corrugated pipe 142 can dissipate heat from the second optical window 192 and also protect it. In addition, the second corrugated pipe 142 can also adjust the alignment of the transmitting component 11 and the receiving component 12, reducing the error of the analyzer in oxygen content analysis and improving the analytical sensitivity of the online laser analyzer 1.

[0064] Please continue reading. Figure 1 In some embodiments, the online laser analyzer 1 further includes a second transition member 182, which is connected between the receiving component 12 and the second bellows 142. The second transition member 182 is provided with a second nitrogen port 1821, which is used to input nitrogen gas for nitrogen purging from the second heat tracing pipe 152 to the gas pipe 13.

[0065] Nitrogen gas enters the second transition piece 182 through the first nitrogen port 1811 and is blown in the direction of the gas pipe 13. Nitrogen gas can not only protect the second optical window 192, but also blow sulfur vapor and liquid sulfur in the second heat tracing pipe 152 into the gas pipe 13. Combined with the temperature in the second heat tracing pipe 152, it can further prevent sulfur vapor and liquid sulfur from solidifying into solid sulfur in the second heat tracing pipe 152.

[0066] Please refer to the following: Figure 1 and Figure 3 In some embodiments, the second heat tracing pipe 152 is provided with a second hollow cavity 1521 and a second interlayer cavity 1522. The second hollow cavity 1521 is for laser to pass through, and the second interlayer cavity 1522 is located outside the second hollow cavity 1521. Steam can be introduced into the second interlayer cavity 1522 to raise the temperature of the second hollow cavity 1521 to above the melting point of sulfur.

[0067] In this embodiment, the second hollow cavity 1521 is connected to the gas pipe 13, and high-temperature steam is introduced into the second interlayer cavity 1522. The high-temperature steam heats and keeps the second hollow cavity 1521 warm, which can ensure that the temperature of the second hollow cavity 1521 is consistently higher than that of solid sulfur, thereby preventing sulfur vapor and liquid sulfur from condensing and depositing as solid sulfur in the second hollow cavity 1521.

[0068] For example, the high-temperature steam in the second interlayer can ensure that the temperature inside the second hollow cavity 1521 is maintained at around 150°C, which is much higher than the melting point of solid sulfur, thereby preventing sulfur vapor and liquid sulfur inside the second hollow cavity 1521 from forming solid sulfur.

[0069] The second hollow cavity 1521 is heated and kept warm by using high-temperature steam, which ensures that the heating and insulation process uses non-toxic and non-polluting media. Furthermore, the high-temperature steam used to heat and keep warm the second hollow cavity 1521 can be recycled, which is beneficial to environmental protection and resource recycling.

[0070] Please continue reading. Figure 1 and Figure 3 In some embodiments, the online laser analyzer 1 further includes a second steam flange 162, which is connected between the receiving component 12 and the second heat tracing pipe 152. The second steam flange 162 is provided with a second air inlet 1621 and a second air outlet 1622. Both the second air inlet 1621 and the second air outlet 1622 are connected to the second interlayer cavity 1522. Steam is input into the second interlayer cavity 1522 through the second air inlet 1621 and output through the second air outlet 1622.

[0071] The second heat tracing pipe 152 can be connected to the second steam flange 162 by welding.

[0072] In this embodiment, high-temperature steam is input into the second interlayer cavity 1522 of the second heat tracing pipe 152 through the second air inlet 1621. After the second interlayer cavity 1522 is filled with high-temperature steam, the high-temperature steam is output from the second air outlet 1622. This can achieve a dynamic balance between the flow rate of the high-temperature steam input through the second air inlet 1621 and the flow rate of the high-temperature steam output through the second air outlet 1622. This can ensure that the temperature of the second hollow cavity 1521 is continuously higher than that of solid sulfur, thereby preventing sulfur vapor and liquid sulfur from condensing and depositing as solid sulfur in the second hollow cavity 1521.

[0073] It is understandable that the first air inlet 1611 of the first steam flange 161 can be connected to the second air inlet 1621 of the second steam flange 162 via the same pipeline for conveying nitrogen, thereby ensuring that the first hollow cavity 1511 of the first heat tracing pipe 151 and the second hollow cavity 1521 of the second heat tracing pipe 152 can achieve synchronous heating and heat preservation.

[0074] In some embodiments, the orientation of the second air inlet 1621 may be opposite to the orientation of the second air outlet 1622.

[0075] Please refer to it again. Figure 1 In some embodiments, the online laser analyzer 1 further includes a second root valve 172, which is connected between the second bellows 142 and the second steam flange 162. The second root valve 172 selectively opens or closes to connect or disconnect the second heat tracing pipe 152 from the second bellows 142.

[0076] In this embodiment, when it is necessary to inspect and maintain the receiving component 12 side of the online laser analyzer 1, the second root valve 172 can be closed to disconnect the second corrugated pipe 142 from the second heat tracing pipe 152, thereby isolating the air pipe 13 from the receiving component 12 side, which is beneficial to ensuring the safety of maintenance personnel; when the online laser analyzer 1 is working, the second root valve 172 can be opened to connect the second corrugated pipe 142 with the second heat tracing pipe 152, so that the laser passing through the air pipe 13 can pass through the second heat tracing pipe 152 and the second corrugated pipe 142 in sequence to reach the receiving component 12.

[0077] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An online laser analyzer, characterized in that, include: The emitting component is used to emit a laser. A receiving component, the receiving component being used to receive the laser; A gas tube is disposed between the transmitting component and the receiving component, and the gas tube is used to circulate the gas to be tested. A first bellows, the first bellows being connected between the launching assembly and the air tube; The second corrugated tube is connected between the air tube and the receiving component. The laser emitted by the transmitting component is transmitted to the receiving component through the first corrugated tube, the air tube and the second corrugated tube. as well as The first heat tracing pipe is connected between the first corrugated pipe and the gas pipe and allows the laser to pass through. The first heat tracing pipe can raise the temperature and make the temperature inside the first heat tracing pipe higher than the melting point of sulfur.

2. The online laser analyzer according to claim 1, characterized in that, The first heat tracing pipe is provided with a first hollow cavity and a first interlayer cavity. The first hollow cavity is for the laser to pass through, and the first interlayer cavity is located outside the first hollow cavity. Steam can be introduced into the first interlayer cavity to raise the temperature of the first hollow cavity to above the melting point of sulfur.

3. The online laser analyzer according to claim 2, characterized in that, It also includes a first steam flange, which is connected between the first bellows and the first heat tracing pipe. The first steam flange is provided with a first air inlet and a first air outlet. Both the first air inlet and the first air outlet are connected to the first interlayer cavity. The steam is input into the first interlayer cavity through the first air inlet and output through the first air outlet.

4. The online laser analyzer according to claim 3, characterized in that, It also includes a first root valve, which is connected between the first bellows and the first steam flange. The first root valve is selectively opened or closed to connect or disconnect the first bellows from the first heat tracing pipe.

5. The online laser analyzer according to claim 1, characterized in that, It also includes a first transition member, which is connected between the transmitting assembly and the first bellows. The first transition member is provided with a first nitrogen port, which is used to input nitrogen gas to purge the gas pipe with nitrogen gas from the first heat tracing pipe.

6. The online laser analyzer according to any one of claims 1-5, characterized in that, It also includes a second heat tracing pipe, which is connected between the gas pipe and the receiving component to allow the laser to pass through. The second heat tracing pipe can heat up and make the temperature inside the second heat tracing pipe higher than the melting point of sulfur.

7. The online laser analyzer according to claim 6, characterized in that, The second heat tracing pipe is provided with a second hollow cavity and a second interlayer cavity. The second hollow cavity is for the laser to pass through, and the second interlayer cavity is located outside the second hollow cavity. Steam can be introduced into the second interlayer cavity to raise the temperature of the second hollow cavity above the melting point of sulfur.

8. The online laser analyzer according to claim 7, characterized in that, It also includes a second steam flange, which is connected between the receiving component and the second heat tracing pipe. The second steam flange is provided with a second air inlet and a second air outlet. Both the second air inlet and the second air outlet are connected to the second interlayer cavity. The steam is input into the second interlayer cavity through the second air inlet and output through the second air outlet.

9. The online laser analyzer according to claim 8, characterized in that, It also includes a second root valve, which is connected between the second bellows and the second steam flange. The second root valve can be selectively opened or closed to connect or disconnect the second heat tracing pipe from the second bellows.

10. The online laser analyzer according to claim 6, characterized in that, It also includes a second transition member, which is connected between the receiving component and the second bellows. The second transition member is provided with a second nitrogen port, which is used to input nitrogen gas to purge the gas pipe with nitrogen gas from the second heat tracing pipe.

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