A detection device for elemental analysis of phenolic resin materials

Abstract

The application discloses a detection device for phenolic resin material element analysis, and belongs to the field of phenolic resin detection equipment, which comprises a cracking furnace, a carrier gas tank is connected to one side of the cracking furnace through a pipeline; an oxygen analysis catalytic reaction assembly is connected to the other end of the cracking furnace, and a TCD detector is connected to one end of the oxygen analysis catalytic reaction assembly; the oxygen analysis catalytic reaction assembly comprises a working cylinder, and a main air inlet pipe is connected to one side of the working cylinder. The oxygen analysis catalytic reaction assembly is arranged, the assembly has two conditions of standard oxygen mode analysis and sulfur-resistant mode analysis, the corresponding mode can be switched according to the sulfur content of the phenolic resin cracking gas to be analyzed, and thus the problem that the conversion rate of CO to CO2 in the oxygen mode is reduced by more than 50% and the oxygen content deviation is large due to the irreversible poisoning of the platinum catalyst of sulfides (SO2) in the single standard oxygen mode analysis when the sulfur-containing phenolic resin is detected is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of phenolic resin detection equipment, more particularly, to a detection device for elemental analysis of phenolic resin material. BACKGROUND

[0002] For elemental analysis of phenolic resin material, the commonly used detection device is mainly selected according to the type of element to be analyzed, the precision requirement, the sample form, and whether the sample needs to be destroyed, etc. For the scene that needs to comprehensively analyze the major elements, CHNS / O elemental analysis method (EA) is the preferred means.

[0003] CHNS / O elemental analysis method (EA) is the most commonly used and standard method for determining the content of carbon (C), hydrogen (H), nitrogen (N), sulfur (S) and oxygen (O) in organic materials. Its principle is that the sample is pyrolyzed and cracked in a high-temperature inert gas (helium), the oxygen-containing products (mainly CO) produced are carried by the carrier gas through the carbon catalyst, and are converted into CO2, and then the TCD detection is performed for elemental analysis.

[0004] The traditional CHNS / O elemental analysis method has two technical defects when detecting the oxygen content of sulfur-containing phenolic resin (such as flame-retardant type, rubber modified type): 1. Sulfur poisoning effect: sulfide (SO2) irreversibly poisons the platinum catalyst, resulting in a decay of more than 50% in the conversion rate of CO to CO2 in the oxygen mode, resulting in a large deviation in oxygen content; 2. High maintenance cost: the catalyst needs to be replaced every 20 sulfur-containing samples. Therefore, the existing CHNS / O elemental analysis method (EA) has limitations in elemental analysis and detection of sulfur-containing phenolic resin in the oxygen mode, resulting in high cost and large deviation in detection results, which needs to be further improved. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a detection device for elemental analysis of phenolic resin material.

[0006] To solve the above problems, the present application adopts the following technical solution.

[0007] A detection device for elemental analysis of phenolic resin material, comprising a cracking furnace, one side of the cracking furnace being connected to a carrier gas tank through a pipeline; the other end of the cracking furnace being connected to an oxygen analysis catalytic reaction assembly, one end of the oxygen analysis catalytic reaction assembly being connected to a TCD detector.

[0008] The oxygen analysis catalytic reaction assembly comprises a working cylinder, one side of the working cylinder is connected with a main air inlet pipe through penetration, a sulfur pre-detection sensor is arranged on the main air inlet pipe, and one end of the main air inlet pipe is connected with a cracking furnace in communication; the other side of the working cylinder is connected with a main air outlet pipe through penetration, one end of the main air outlet pipe is connected with a TCD detector in communication; the main air inlet pipe and the main air outlet pipe extend to one end of the working cylinder inside and are fixedly connected with a switching connection assembly; and the main air inlet pipe and the main air outlet pipe are movably connected with a rotating base through the switching connection assembly, one end of the rotating base is fixedly connected with a stepping motor, and the stepping motor is fixedly connected to one side of the working cylinder; the rotating base is symmetrically provided with an oxygen mode catalytic assembly and a sulfur-resistant catalytic assembly inside, and the oxygen analysis catalytic reaction assembly further comprises a processing unit.

[0009] Further, the switching connection assembly comprises rotating ring bodies fixedly connected to the lower ends of the main air inlet pipe and the main air outlet pipe respectively, a connecting channel is formed in the middle position of the upper end of the rotating ring body and is connected with the main air inlet pipe and the main air outlet pipe through the connecting channel respectively, graphite sealing rings are arranged on the two sides of the rotating ring body, and limit ring grooves are formed in the positions of the outer circular surface of the rotating base corresponding to the rotating ring bodies, and the rotating ring bodies are rotatably sleeved in the limit ring grooves.

[0010] Further, the oxygen mode catalytic assembly comprises a cavity A formed in one side of the rotating base inside, two second channels are symmetrically formed in the two sides of the rotating base inside with respect to the cavity A, the outlet positions of the two second channels extend to the limit ring grooves, and the positions of the two second channels in the vertical direction are located in the same plane as the positions of the two connecting channels; a carbon nanotube is arranged in the cavity A, sintered metal filter screens are fixedly connected to the two sides of the carbon nanotube, and platinum catalyst particles are filled in the carbon nanotube.

[0011] Further, the sulfur-resistant catalytic assembly comprises a cavity B formed in the other side of the rotating base inside, and the cavity B is symmetrically arranged with the cavity A; two first channels are symmetrically formed in the two sides of the rotating base inside with respect to the cavity B, the outlet positions of the two first channels extend to the limit ring grooves, and the positions of the two first channels in the vertical direction are located in the same plane as the positions of the two connecting channels; two support skeletons are fixedly connected inside the cavity B, a CeZr solid solution composite layer and a ZSM-5 molecular sieve composite membrane are arranged in the middle of the two support skeletons, and the CeZr solid solution composite layer and the ZSM-5 molecular sieve composite membrane are in close contact.

[0012] Further, the oxygen analysis catalytic reaction assembly further comprises a regeneration assembly; the regeneration assembly comprises a hydrogen-helium mixed gas tank connected to the main air inlet pipe through a pipeline; a heating plate and a temperature sensor arranged on the inner wall of the working cylinder, a hot-type mass flow meter arranged on the main air inlet pipe, a regeneration gas outlet communicated with the main air outlet pipe, and an electrochemical H2S sensor arranged on the regeneration gas outlet; and electromagnetic valves arranged on the main air outlet pipe and the regeneration gas outlet.

[0013] Further, the processing unit is used to collect monitoring signals of the sulfur pre-detection sensor in real time to judge the sulfur concentration in the cracking gas and select a working mode; regeneration judgment is made according to the working mode and regeneration execution logic is established; data of the thermal mass flow meter and the sulfur pre-detection sensor are received in real time and a mathematical model is established to calculate the regeneration time; electrochemical H2S sensor data are received in real time to establish regeneration termination judgment logic and control the regeneration termination.

[0014] Further, the processing unit is used to collect monitoring signals of the sulfur pre-detection sensor in real time to judge the sulfur concentration in the cracking gas and select a working mode; regeneration judgment is made according to the working mode and regeneration execution logic is established; data of the thermal mass flow meter and the sulfur pre-detection sensor are received in real time and a mathematical model is established to calculate the regeneration time; electrochemical H2S sensor data are received in real time to establish regeneration termination judgment logic and control the regeneration termination.

[0015] Standard oxygen mode: when the sulfur pre-detection sensor reading is < 10 ppm: the rotating base cuts the oxygen mode catalytic assembly into the main gas path;

[0016] Standard oxygen mode: when the sulfur pre-detection sensor reading is ≥ 10 ppm: the rotating base rotates 180° to cut the sulfur-resistant catalytic assembly into the main gas path.

[0017] Further, regeneration judgment is made according to the working mode and regeneration execution logic is established, including:

[0018] After the sulfur concentration in the cracking gas is judged according to the monitoring signals of the sulfur pre-detection sensor and the working mode is selected, regeneration judgment is determined; if the sulfur-resistant catalytic assembly is used in this analysis, regeneration needs to be marked, and if the sulfur-resistant catalytic assembly is not used, no marking is needed; regeneration execution logic is established based on the marking result.

[0019] Further, data of the thermal mass flow meter and the sulfur pre-detection sensor are received in real time and a mathematical model is established to calculate the regeneration time, including:

[0020] The regeneration temperature is limited to 400℃, and the hydrogen-helium mixed gas tank is regenerated with 5% H2 / He mixed gas; under this condition, data of the thermal mass flow meter and the sulfur pre-detection sensor are received in real time and a mathematical model is established to calculate the total sulfur adsorbed by the catalyst before regeneration, and a model is established to calculate the target regeneration time according to the total sulfur adsorbed by the catalyst before regeneration.

[0021] Further, electrochemical H2S sensor data are received in real time to establish regeneration termination judgment logic and control the regeneration termination, including:

[0022] The electrochemical H2S sensor data are received in real time, combined with the target regeneration time, and if the actual regeneration time is greater than or equal to the target regeneration time, or the H2S concentration monitored by the electrochemical H2S sensor is ≤ 2 ppm for 30 seconds, the regeneration termination is controlled, and the regeneration process is completed.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] (1) The application sets an oxygen analysis catalytic reaction assembly, which has two cases of standard oxygen mode analysis and sulfur-resistant mode analysis, can switch the corresponding mode according to the sulfur content of the phenolic resin cracking gas to be analyzed, and thus avoids the problem that the CO→CO2 conversion rate in the oxygen mode is attenuated by more than 50% and the oxygen content deviation is large due to the irreversible poisoning of the platinum catalyst by sulfides (SO2) when a single standard oxygen mode analysis is used to detect sulfur-containing phenolic resin.

[0025] (2) The application sets a regeneration assembly, which can reduce the sulfur-resistant catalytic assembly in situ in real time after the sulfur-resistant catalytic assembly is used, and thus ensures the use of the sulfur-resistant catalytic assembly, has lower maintenance cost than the prior art, does not need to frequently replace the catalyst, and saves cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall flow structure of the application;

[0027] Figure 2 It is a schematic diagram of the overall structure of the oxygen analysis catalytic reaction assembly of the application;

[0028] Figure 3 It is a schematic diagram of the cross-sectional structure of the application; Figure 2

[0029] Figure 4 It is a schematic diagram of the structure of the application after removing the rotating base and the internal elements thereof; Figure 2

[0030] Figure 5 It is a schematic diagram of the structure of the rotating base and the internal elements thereof of the application.

[0031] Explanation of reference numerals in the drawings:

[0032] 1, working cylinder; 2, main air inlet pipe; 3, thermal mass flow meter; 4, sulfur pre-detection sensor; 5, main air outlet pipe; 6, stepping motor;

[0033] 7, switching connection assembly; 71, rotating ring body; 72, graphite sealing ring; 73, connection channel; 74, limiting ring groove;

[0034] 8, sulfur-resistant catalytic assembly; 81, first channel; 82, cavity B; 83, CeZr solid solution composite layer; 84, ZSM-5 molecular sieve composite membrane; 85, support framework;

[0035] 9, oxygen mode catalytic assembly; 91, cavity A; 92, second channel; 93, carbon nanotube; 94, sintered metal filter screen;

[0036] ​​10, rotary base; 11, regenerative gas outlet; 12, electrochemical H2S sensor; 13, solenoid valve; 14, heating plate; 15, temperature sensor. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0038] Please refer to Figures 1 to 5 A detection device for elemental analysis of phenolic resin material, comprising a cracking furnace, one side of the cracking furnace is communicated with a carrier gas tank through a pipeline;

[0039] The other end of the cracking furnace is communicated with an oxygen analysis catalytic reaction assembly, one end of the oxygen analysis catalytic reaction assembly is communicated with a TCD detector;

[0040] The oxygen analysis catalytic reaction assembly comprises a working cylinder 1, one side of the working cylinder 1 is through-connected with a main air inlet pipe 2, a sulfur pre-detection sensor 4 is arranged on the main air inlet pipe 2 and one end of the main air inlet pipe 2 is communicated with the cracking furnace; the other side of the working cylinder 1 is through-connected with a main air outlet pipe 5, one end of the main air outlet pipe 5 is communicated with the TCD detector; the main air inlet pipe 2 and the main air outlet pipe 5 extend to one end inside the working cylinder 1 and are both fixedly connected with a switching connection assembly 7; and the main air inlet pipe 2 and the main air outlet pipe 5 are both movably connected with a rotary base 10 through the switching connection assembly 7, one end of the rotary base 10 is fixedly connected with a stepping motor 6, and the stepping motor 6 is fixedly connected to one side of the working cylinder 1; the rotary base 10 is symmetrically provided with an oxygen mode catalytic assembly 9 and a sulfur-resistant catalytic assembly 8 inside, and the oxygen analysis catalytic reaction assembly further comprises a processing unit.

[0041] As shown in Figure 3 and Figure 4 shown, the switching connection assembly 7 comprises rotary ring bodies 71 fixedly connected to lower ends of the main air inlet pipe 2 and the main air outlet pipe 5 respectively, connection channels 73 are formed in the upper ends of the rotary ring bodies 71 and the main air inlet pipe 2 and the main air outlet pipe 5 are communicated with the connection channels 73 respectively; graphite sealing rings 72 are arranged on both sides of the rotary ring bodies 71, limit ring grooves 74 are formed in positions of the outer circular surface of the rotary base 10 corresponding to the rotary ring bodies 71, and the rotary ring bodies 71 are rotatably sleeved in the limit ring grooves 74.

[0042] As shown in Figure 5As shown, the oxygen mode catalytic assembly 9 includes a cavity A91 opened in one side of the rotating base 10, two second channels 92 are symmetrically opened in the rotating base 10 about the two sides of the cavity A91, and the outlet positions of the two second channels 92 extend to the limiting ring groove 74, and are located in the same plane as the positions of the two connecting channels 73 in the vertical direction; the cavity A91 is provided with a carbon nanotube 93, the carbon nanotube 93 is fixedly connected with a sintered metal filter screen 94 on both sides, and the carbon nanotube 93 is filled with platinum catalyst particles.

[0043] As shown in Figure 5 As shown, the sulfur-resistant catalytic assembly 8 includes a cavity B82 opened in the other side of the rotating base 10, and the cavity B82 is symmetrically arranged with the cavity A91; two first channels 81 are symmetrically opened in the rotating base 10 about the two sides of the cavity B82, and the outlet positions of the two first channels 81 extend to the limiting ring groove 74, and are located in the same plane as the positions of the two connecting channels 73 in the vertical direction; two support skeletons 85 are fixedly connected in the cavity B82, a CeZr solid solution composite layer 83 and a ZSM-5 molecular sieve composite membrane 84 are arranged in the middle of the two support skeletons 85, and the CeZr solid solution composite layer 83 and the ZSM-5 molecular sieve composite membrane 84 are in close contact.

[0044] In the element analysis, first, the phenolic resin material to be analyzed is placed in the cracking furnace for cracking, and at the same time, the carrier gas tank is connected to the cracking furnace to introduce the carrier gas, which is usually an inert gas such as nitrogen; after the carrier gas is introduced, the mixed gas of cracking gas and carrier gas passes through the main gas inlet pipe 2, and at this time, the sulfur pre-detection sensor 4 detects the sulfur concentration in the mixed gas of cracking gas and carrier gas;

[0045] If the reading of the sulfur pre-detection sensor 4 is <10 ppm: the rotating base 10 cuts the oxygen mode catalytic assembly 9 into the main gas path (standard oxygen mode); in the standard oxygen mode, no switching is required (set the initial state of the oxygen mode catalytic assembly 9 connected to the main gas path), at this time, the mixed gas passes through the main gas inlet pipe 2 and enters the oxygen mode catalytic assembly 9 through the connecting channel 73 in the switching connection assembly 7, specifically, first enters the second channel 92, and then enters the cavity A91, and then passes through the sintered metal filter screen 94 into the platinum catalyst particles in the carbon nanotube 93, the platinum catalyst particles cooperate with the carbon nanotube 93 to efficiently catalyze CO in the mixed gas into CO2, and after catalysis, the mixed gas flows into the TCD detector through the main gas outlet pipe 5 for oxygen element analysis.

[0046] If the sulfur pre-check sensor 4 reading is greater than or equal to 10 ppm: At this time, the output shaft of the stepping motor 6 needs to be controlled to rotate and drive the rotating base 10 to rotate 180° to cut the sulfur-resistant catalytic component 8 into the main gas path (sulfur-resistant mode), and switch the connection component 7 to work. Specifically, first control the output shaft of the stepping motor 6 to rotate and drive the rotating base 10 to rotate 180°. At this time, due to the presence of the rotating ring body 71 and the graphite sealing ring 72, the gas inside the main air inlet pipe 2 can be sealed to prevent gas leakage until the first channel 81 is connected to the main gas path, and the mixed gas enters the first channel 81 through the connecting channel 73.

[0047] The two first channels 81 are connected to the main gas path and are in communication with the main air inlet pipe 2 and the main air outlet pipe 5. At this time, the mixed gas first enters the first channel 81 and then enters the cavity B82 from the first channel 81. Then the mixed gas is catalytically oxidized by the CeZr solid solution composite layer 83 and the ZSM-5 molecular sieve composite membrane 84. At this time, the surface oxygen vacancies of the CeZr solid solution composite layer 83 first capture SO2 to form stable cerium sulfate, and then the remaining mixed gas passes through the ZSM-5 molecular sieve composite membrane 84 and is catalyzed by the acid sites in the pore channel of the ZSM-5 molecular sieve composite membrane 84 to convert CO to CO2. After catalysis, the mixed gas flows into the TCD detector through the main air outlet pipe 5 for oxygen element analysis.

[0048] It should be noted that during the oxidation catalysis, the oxygen analysis catalytic reaction component should be kept at a heating state of 180°C.

[0049] As shown in Figure 1 , Figure 2 and Figure 4 , the oxygen analysis catalytic reaction component further comprises a regeneration component; the regeneration component comprises a hydrogen-helium mixed gas tank connected to the main air inlet pipe 2 through a pipeline; a heating plate 14 and a temperature sensor 15 arranged on the inner wall of the working cylinder 1, a thermal mass flow meter 3 arranged on the main air inlet pipe 2, a regeneration gas outlet 11 communicated with the main air outlet pipe 5, and an electrochemical H2S sensor 12 arranged on the regeneration gas outlet 11; electromagnetic valves 13 are arranged on the main air outlet pipe 5 and the regeneration gas outlet 11.

[0050] After using the sulfur-resistant catalytic component 8, the sulfur-resistant catalytic component 8 needs to be regenerated to ensure its sulfur resistance. During regeneration, the following steps are taken:

[0051] First, the element analysis work stops and the cracking furnace stops working before regeneration. The regeneration condition is 400°C, which is heated by the heating plate 14 and the temperature sensor 15 detects the temperature data. The hydrogen-helium mixed gas tank introduces regeneration gas into the main air inlet pipe 2. The regeneration gas is 5% H2 / He mixed gas, which enters the cavity B82 through the main air inlet pipe 2. The hydrogen in the regeneration gas reduces cerium sulfate, and the specific reaction is as follows:

[0052]

[0053] The released H2S and other gases pass through the main gas outlet pipe 5 into the regeneration gas outlet 11 and are captured by the downstream basic adsorbent. It should be noted that during regeneration, the electromagnetic valve 13 on the main gas outlet pipe 5 is closed, and the electromagnetic valve 13 on the regeneration gas outlet 11 is opened. During oxidation analysis, the operations are reversed.

[0054] The processing unit is used to collect the monitoring signals of the sulfur pre-detection sensor 4 in real time to determine the sulfur concentration in the cracking gas and select the working mode; regeneration judgment is made according to the working mode, and regeneration execution logic is established; the data of the thermal mass flow meter 3 and the sulfur pre-detection sensor 4 are received in real time, and a mathematical model is established to calculate the regeneration time; the data of the electrochemical H2S sensor 12 are received in real time, and regeneration termination judgment logic is established to control the termination of regeneration.

[0055] In some implementations, the monitoring signals of the sulfur pre-detection sensor 4 are collected in real time to determine the sulfur concentration in the cracking gas and select the working mode, which includes two types, one being a standard oxygen mode and the other being a sulfur-resistant mode.

[0056] Standard oxygen mode: when the sulfur pre-detection sensor 4 reading is <10 ppm: the rotating base 10 cuts the oxygen mode catalytic assembly 9 into the main gas path;

[0057] Sulfur-resistant mode: when the sulfur pre-detection sensor 4 reading is ≥10 ppm: the rotating base 10 rotates 180° to cut the sulfur-resistant catalytic assembly 8 into the main gas path.

[0058] In some implementations, regeneration judgment is made according to the working mode and regeneration execution logic is established, including:

[0059] After determining the sulfur concentration in the cracking gas based on the monitoring signals of the sulfur pre-detection sensor 4 and selecting the working mode, regeneration judgment is determined. If the sulfur-resistant catalytic assembly 8 is used in this analysis, regeneration needs to be marked. If the sulfur-resistant catalytic assembly 8 is not used, no marking is needed. Regeneration execution logic is established based on the marking results.

[0060] If the sulfur-resistant catalytic assembly 8 is used in this analysis, regeneration needs to be marked, and the regeneration mark is set as R, 0 indicating no regeneration is needed, and 1 indicating regeneration is needed. The regeneration execution logic is as follows:

[0061]

[0062] Wherein, A represents the use of the oxygen mode catalytic assembly 9, B represents the use of the sulfur-resistant catalytic assembly 8, and M represents the working mode.

[0063] In some implementations, data from the thermal mass flow meter 3 and the sulfur pre-check sensor 4 are received in real time and a mathematical model is established to calculate the regeneration time, including:

[0064] The regeneration temperature is limited to 400°C, and the hydrogen-helium mixed gas tank is regenerated with 5% H2 / He mixed gas. Under this condition, the data from the thermal mass flow meter 3 and the sulfur pre-check sensor 4 are received in real time and a mathematical model is established to calculate the total sulfur adsorbed by the catalyst before regeneration, and a model is established to calculate the target regeneration time based on the total sulfur adsorbed by the catalyst before regeneration.

[0065] By using the above technical solution, based on the data from the thermal mass flow meter 3 and the sulfur pre-check sensor 4, a mathematical model is established to calculate the total sulfur adsorbed by the catalyst before regeneration under the limited conditions:

[0066]

[0067] Where Q0 represents the total sulfur adsorbed by the catalyst before regeneration (unit: mmol); Cso2 represents the SO2 concentration (ppm), which is output in real time by the sulfur pre-check sensor 4; t1 represents the end time of catalysis, t represents the start time of catalysis; F g represents the carrier gas flow rate (mL / min), which is monitored in real time by the thermal mass flow meter 3; represents the integral of time t.

[0068] After calculating the total sulfur adsorbed by the catalyst before regeneration, the target regeneration time is calculated:

[0069]

[0070] Where t M represents the target regeneration time, K is the system preheating and gas replacement basic time, which is taken as 3.0 min, and W is the cleaning time per millimole of sulfur, which is taken as 12.0 min / mmol.

[0071] In some implementations, the electrochemical H2S sensor 12 data is received in real time, a regeneration termination judgment logic is established, and the regeneration is controlled to terminate, including:

[0072] The electrochemical H2S sensor 12 data is received in real time, combined with the target regeneration time, if the actual regeneration time is greater than or equal to the target regeneration time, or the H2S concentration monitored by the electrochemical H2S sensor 12 is less than or equal to 2 ppm for 30 seconds, the regeneration is controlled to terminate, and the regeneration process is completed.

[0073] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art, according to the technical solution of the present application and the improved concept thereof, makes equivalent replacement or change within the technical range disclosed by the present application, and should be covered within the protection scope of the present application.

Claims

1. A detection device for elemental analysis of phenolic resin materials, comprising a pyrolysis furnace, one side of which is connected to a carrier gas tank via a pipeline; characterized in that: The other end of the pyrolysis furnace is connected to an oxygen analysis catalytic reaction assembly, and one end of the oxygen analysis catalytic reaction assembly is connected to a TCD detector. The oxygen analysis catalytic reaction assembly includes a working cylinder (1), one side of which is connected to a main inlet pipe (2), a sulfur pre-detection sensor (4) is provided on the main inlet pipe (2) and one end is connected to the cracking furnace; the other side of the working cylinder (1) is connected to a main outlet pipe (5), one end of which is connected to a TCD detector; the main inlet pipe (2) and the main outlet pipe (5) extend into the working cylinder (1) and are both fixedly connected to a switching connection assembly (7); the main inlet pipe (2) and the main outlet pipe (5) are both movably connected to a rotating base (10) through the switching connection assembly (7), one end of which is fixedly connected to a stepper motor (6), and the stepper motor (6) is fixedly connected to one side of the working cylinder (1); the rotating base (10) is symmetrically provided with an oxygen mode catalytic assembly (9) and an anti-sulfur catalytic assembly (8), and the oxygen analysis catalytic reaction assembly also includes a processing unit; The oxygen mode catalytic component (9) includes a cavity A (91) opened on one side inside the rotating base (10). The rotating base (10) has two second channels (92) symmetrically opened on both sides of the cavity A (91). The outlet positions of the two second channels (92) extend to the limiting ring groove (74) and are located on the same plane as the two connecting channels (73) in the vertical direction. The cavity A (91) is provided with carbon nanotubes (93). The carbon nanotubes (93) are fixedly connected to sintered metal meshes (94) on both sides. The carbon nanotubes (93) are filled with platinum catalyst particles. The anti-sulfur catalyst component (8) includes a cavity B (82) located on the other side of the rotating base (10), and the cavity B (82) is symmetrically arranged with the cavity A (91); the rotating base (10) has two first channels (81) symmetrically arranged on both sides of the cavity B (82), and the outlet positions of the two first channels (81) extend to the limiting ring groove (74), and are located on the same plane as the two connecting channels (73) in the vertical direction; the cavity B (82) is fixedly connected with two support skeletons (85), and a CeZr solid solution composite layer (83) and a ZSM-5 molecular sieve composite membrane (84) are provided in the middle of the two support skeletons (85), and the CeZr solid solution composite layer (83) and the ZSM-5 molecular sieve composite membrane (84) are in close contact.

2. The detection device for elemental analysis of phenolic resin materials according to claim 1, characterized in that: The switching connection assembly (7) includes a rotating ring (71) fixedly connected to the lower ends of the main air intake pipe (2) and the main air outlet pipe (5). A connecting channel (73) is opened at the middle position of the upper end of the rotating ring (71) and it is connected to the main air intake pipe (2) and the main air outlet pipe (5) through the connecting channel (73). Graphite sealing rings (72) are provided on both sides of the rotating ring (71). Limiting ring grooves (74) are opened on the outer circumference of the rotating base (10) corresponding to the position of the rotating ring (71), and the rotating ring (71) is rotated and sleeved in the limiting ring groove (74).

3. The detection device for elemental analysis of phenolic resin materials according to claim 1, characterized in that: The oxygen analysis catalytic reaction assembly also includes a regeneration assembly; the regeneration assembly includes: a hydrogen-helium mixed gas tank, which is connected to the main inlet pipe (2) via a pipeline; it also includes a heating plate (14) and a temperature sensor (15) disposed on the inner wall of the working cylinder (1); a thermal mass flow meter (3) is also provided on the main inlet pipe (2); a regeneration gas outlet (11) is connected to the main outlet pipe (5), and an electrochemical H2S sensor (12) is provided on the regeneration gas outlet (11); a solenoid valve (13) is provided on both the main outlet pipe (5) and the regeneration gas outlet (11).

4. The detection device for elemental analysis of phenolic resin materials according to claim 1, characterized in that: The processing unit is used to collect the monitoring signal of the sulfur pre-detection sensor (4) in real time to judge the sulfur concentration in the cracked gas and select the working mode; to make a regeneration judgment according to the working mode and establish the regeneration execution logic; to receive the data of the thermal mass flow meter (3) and the sulfur pre-detection sensor (4) in real time and establish a mathematical model to calculate the regeneration time; to receive the data of the electrochemical H2S sensor (12) in real time, establish the regeneration termination judgment logic, and control the regeneration termination.

5. The detection device for elemental analysis of phenolic resin materials according to claim 4, characterized in that: The monitoring signal of the sulfur pre-detection sensor (4) is used to collect the sulfur concentration in the cracked gas in real time, and to select the working mode. There are two working modes: one is the standard oxygen mode and the other is the anti-sulfur mode. Standard oxygen mode: When the sulfur pre-detection sensor (4) reading is <10ppm: Rotate the base (10) to switch the oxygen mode catalytic assembly (9) into the main gas path; Anti-sulfur mode: When the reading of the sulfur pre-detection sensor (4) is ≥10ppm: Rotate the base (10) 180° to cut the anti-sulfur catalyst component (8) into the main gas path.

6. The detection device for elemental analysis of phenolic resin materials according to claim 5, characterized in that: Based on the working mode, a regeneration judgment is made and a regeneration execution logic is established, including: The sulfur concentration in the cracked gas is determined based on the monitoring signal of the sulfur pre-detection sensor (4). After selecting the working mode, the regeneration judgment is determined. If the anti-sulfur catalyst component (8) is used in this analysis, the regeneration needs to be marked. If the anti-sulfur catalyst component (8) is not used, the regeneration does not need to be marked. The regeneration execution logic is established based on the marking results.

7. The detection device for elemental analysis of phenolic resin materials according to claim 6, characterized in that: The data from the thermal mass flow meter (3) and the sulfur pre-detection sensor (4) are received in real time, and a mathematical model is established to calculate the regeneration time, including: The regeneration temperature is limited to 400℃, and the regeneration gas in the hydrogen-helium mixed gas tank is 5% H2 / He mixed gas. Under this condition, the data from the thermal mass flow meter (3) and the sulfur pre-detection sensor (4) are received in real time and a mathematical model is established to calculate the total amount of sulfur adsorbed by the catalyst before regeneration. The target regeneration time is calculated based on the total amount of sulfur adsorbed by the catalyst before regeneration.

8. The detection device for elemental analysis of phenolic resin materials according to claim 7, characterized in that: Real-time reception of data from electrochemical H2S sensor (12), establishment of regeneration termination judgment logic, and control of regeneration termination, including: The system receives data from the electrochemical H2S sensor (12) in real time. Combined with the target regeneration time, if the actual regeneration time is greater than or equal to the target regeneration time, or if the H2S concentration monitored by the electrochemical H2S sensor (12) is ≤2ppm for 30 seconds, the regeneration is terminated and the regeneration process is completed.

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