A whole-hydrocarbon quantitative collection gas path device and an adsorption and desorption coupling method

Abstract

The application belongs to the technical field of environmental monitoring and chemical analysis, and discloses a kind of all-hydrocarbon quantitative collection gas path device and adsorption desorption coupling method, including collection tank on support frame, gas inlet and outlet component for gas, monitoring component for monitoring pressure in monitoring tank and pressure relief valve for maintaining adsorption pressure, and filter component connected through quick release structure in tank and conveying component for accelerating gas desorption.The device effectively solves the problems of complicated operation, disassembly and assembly inconvenience in traditional methods, improves maintenance efficiency and reduces operation burden;By realizing quantitative collection and real-time air pressure regulation, the data accuracy and reliability are significantly improved;At the same time, reasonable gas path design shortens the collection time and reduces the interference of external impurities, so as to fully meet the core needs of modern environmental monitoring for high efficiency, accuracy and convenience.

Description

Technical Field

[0001] This invention belongs to the field of environmental monitoring and chemical analysis technology, and particularly relates to a gas path device for quantitative collection of all hydrocarbons and an adsorption-desorption coupling method. Background Technology

[0002] Total hydrocarbons (THCs) are a core monitoring indicator, specifically defined as the sum of gaseous organic compounds that respond to a hydrogen flame ionization detector under experimental instrument conditions. With increasing global environmental awareness and increasingly stringent emission regulations, accurate THC monitoring is crucial for controlling industrial waste gas emissions, ensuring air quality, and preventing environmental risks caused by volatile organic compound (VOC) pollution. It is widely used in various scenarios such as chemical engineering, petroleum refining, and industrial park environmental management, serving as a key support for achieving green production and ecological environmental protection. Currently, the industry has placed higher demands on the efficiency, accuracy, and convenience of THC monitoring.

[0003] Currently, traditional total hydrocarbon collection methods used in the industry still have many prominent shortcomings and are difficult to adapt to modern monitoring needs. Firstly, the operation process is cumbersome, and the disassembly and assembly of core filter components is inconvenient, greatly affecting the efficiency of equipment maintenance, component replacement, and cleaning, and increasing the workload of operators. Secondly, the collection accuracy is insufficient, failing to achieve quantitative collection of total hydrocarbons, making it difficult to accurately obtain the actual concentration level of total hydrocarbons in the air, affecting the reliability of monitoring data. Thirdly, the lack of real-time air pressure monitoring and control mechanisms makes it impossible to capture dynamic changes in total hydrocarbon concentration in a timely manner, hindering the rapid detection of anomalies and the implementation of targeted countermeasures. Fourthly, the unreasonable design of the gas delivery path not only prolongs the collection time but also makes the purity of the collected gas susceptible to external impurities, further reducing the accuracy of monitoring data.

[0004] It is evident that traditional total hydrocarbon collection methods suffer from problems such as cumbersome operation, low quantitative accuracy, inconvenient disassembly and assembly, and low efficiency, which seriously restrict the efficient and orderly development of total hydrocarbon monitoring and fail to meet the core requirements of modern environmental monitoring for efficiency, accuracy, and convenience. Summary of the Invention

[0005] This invention provides a gas path device for quantitative collection of total hydrocarbons and an adsorption-desorption coupling method. Using this device and method can effectively solve the problems of cumbersome operation, low quantitative accuracy, inconvenient disassembly and assembly, and low efficiency of traditional total hydrocarbon collection measures. It can promote the efficient and orderly development of total hydrocarbon monitoring and meet the core requirements of modern environmental monitoring for efficiency, accuracy and convenience.

[0006] To achieve the above objectives, the present invention employs the following technical content: A quantitative gas sampling device for all hydrocarbons includes a support frame; A collection tank is installed on the support frame; The collection tank is equipped with a gas delivery assembly for introducing and exporting gas; The top of the collection tank is equipped with a monitoring component for monitoring the pressure inside the tank and a pressure relief valve for maintaining the adsorption pressure inside the tank. The collection tank is equipped with a connected filter assembly and a conveying assembly; the conveying assembly is connected between the first filter section and the second filter section of the filter assembly to accelerate the gas desorption rate. The first filter section is connected to the air inlet of the gas delivery assembly, and the second filter section is connected to the air outlet of the gas delivery assembly. The first filter section and the second filter section are connected by a quick-release structure; The quick-release structure includes a first quick-release part and a second quick-release part; The first quick-release part includes a first fixing ring plate and a first fixing plate disposed inside the collection tank; the top of the first fixing ring plate is connected to the bottom of the first fixing plate by a positioning snap-fit ​​mechanism; the first filter part is connected to the top of the first fixing plate; The second quick-release part includes a second fixing ring plate disposed inside the collection tank; a threaded sleeve is connected to the top of the second fixing ring plate, and the threaded sleeve is screwed to the first fixing plate; the second filter part is connected to the bottom of the second fixing ring plate.

[0007] Furthermore, the first filter section includes a second fixing plate fixed to the top of the first fixing plate; A filter basket is fixed on the second fixing plate; the filter basket has a plurality of first air supply holes that communicate with the air inlet end of the air supply assembly; the filter basket is filled with activated carbon adsorbent. The conveying assembly includes a snap-fit ​​plate that snaps onto the top of the first fixed plate. The snap-fit ​​plate has several second air inlets; each second air inlet is fitted with a fixing sleeve; the fixing sleeve has several third air inlets facing the air outlet direction of the filter basket; the second air inlets are connected to the second filter section.

[0008] Furthermore, the second filtration section includes a filter bag fixed to the bottom of the second fixing ring plate; the filter bag is connected to the second air supply hole and the air outlet of the air supply assembly, respectively.

[0009] Furthermore, the second quick-release part also includes a snap-fit ​​groove formed on the top of the first fixing plate; the snap-fit ​​plate is snap-fitted into the snap-fit ​​groove.

[0010] Furthermore, the positioning and locking mechanism includes an arc-shaped locking plate disposed at the bottom of the first fixed plate, a locking rod groove opened at the bottom of the first fixed plate, an arc-shaped locking groove opened at the top of the first fixed ring plate, and a locking rod disposed at the top of the first fixed ring plate. The arc-shaped snap-fit ​​plate is snapped into the arc-shaped snap-fit ​​groove; the snap-fit ​​rod groove is snapped into the snap-fit ​​rod.

[0011] Furthermore, the gas delivery assembly includes a limiting hole formed on the wall of the collection tank; a set of limiting holes is connected to a first gas delivery pipe, and another set of limiting holes is connected to a third gas delivery pipe; the inlet end of the first gas delivery pipe is connected to a second gas delivery pipe; and the outlet end of the third gas delivery pipe is connected to a fourth gas delivery pipe.

[0012] An adsorption-desorption coupling method for all hydrocarbons, based on the aforementioned quantitative all hydrocarbon gas sampling device, includes: The gas to be tested is injected into the collection tank through the gas inlet of the gas delivery assembly. The gas to be tested flows through the first filter section of the filter assembly. The pressure inside the tank is monitored by the monitoring assembly. The adsorption pressure inside the tank is maintained by the pressure relief valve. The total hydrocarbon components in the gas to be tested are adsorbed and retained by the first filter section. The filtered gas passes through the conveying assembly and enters the second filtration section of the filtration assembly. The gas that is filtered again is led out from the outlet of the gas conveying assembly to the vacuum system for desorption. A conveying assembly is used to transport the gas flow, thereby accelerating the gas desorption rate; After desorption is completed, the first filter section and the second filter section are separated by a quick-release structure. The first filter section is then regenerated with adsorbent. After the second filter section is replaced, the first filter section and the replaced second filter section are reassembled using the quick-release structure to reset the total hydrocarbon quantitative gas sampling device.

[0013] Furthermore, the monitoring component monitors the pressure inside the tank, and the pressure relief valve maintains the adsorption pressure inside the tank. During the process of the full hydrocarbon components in the gas to be tested being adsorbed and retained by the first filter section, the monitoring component monitors the pressure inside the tank. Combined with the PID gas pressure control logic that introduces a pressure response coefficient, the pressure relief valve maintains the adsorption pressure inside the tank at a preset level. Based on the pre-constructed total hydrocarbon adsorption capacity calculation model and combined with the adsorption efficiency correction coefficient, the mass of total hydrocarbon components adsorbed and retained is calculated in real time. The filtered gas enters the second filtration section of the filtration assembly through the conveying assembly, and the gas filtered again is led out to the vacuum system from the gas outlet of the gas conveying assembly. During the desorption process, the desorption efficiency is calculated in real time based on the pre-constructed desorption efficiency calculation model, combined with the desorption transmission coefficient and the flow correction coefficient. The pressure response coefficient, adsorption efficiency correction coefficient, desorption transport coefficient, and flow rate correction coefficient were all obtained through experimental calibration.

[0014] Furthermore, the total hydrocarbon adsorption capacity calculation model is constructed based on the Langmuir adsorption isotherm equation, wherein the specific formula of the Langmuir adsorption isotherm equation with the adsorption efficiency correction coefficient is as follows:

[0015] In the formula, This represents the actual equilibrium adsorption capacity, in mg / g. This is the adsorption efficiency correction factor; The saturation adsorption capacity is expressed in mg / g. It is the adsorption equilibrium constant; The partial pressure of the total hydrocarbon components is given in Pa.

[0016] In the formula, The adsorption pressure inside the tank is expressed in Pa. The mole fraction of total hydrocarbons in the gas to be tested; By introducing correction coefficients for the van der Hoff equation To reduce the effect of temperature on the adsorption equilibrium constant, the specific formula is as follows:

[0017] In the formula, Reference temperature The adsorption equilibrium constant at Pa - ¹; For adsorption enthalpy change, J / mol, Here is the universal gas constant, J / (mol·K). The adsorption temperature is K; It is a natural exponential function; The specific expression of the final total hydrocarbon adsorption capacity calculation model is as follows:

[0018] The specific expression of the desorption efficiency calculation model is as follows:

[0019] In the formula, For desorption efficiency; The mass of activated carbon adsorbent is expressed in grams. For flow coefficient; This refers to the number of third air inlets; The diameter of the third air inlet is in meters (m). The instantaneous pressure difference between the tank and the vacuum system, expressed in Pa. The density of the desorbed gas is kg / m³. 3 ; This represents the instantaneous concentration of total hydrocarbons in the desorbed gas. The desorption transmission coefficient; This is the flow correction factor; The total desorption time is in seconds. The pressure relief valve opening is adjusted by incorporating a PID air pressure control logic with an introduced pressure response coefficient. The specific formula is as follows:

[0020] In the formula, This is the pressure response coefficient; This is the proportionality coefficient. The integral coefficient is... These are the differential coefficients; Pressure deviation, MPa;

[0021] In the formula, The target adsorption pressure is expressed in MPa. The target adsorption pressure is expressed in MPa. Among them, when Then increase the opening of the pressure relief valve; when When this happens, reduce the opening of the pressure relief valve; The maximum allowable overshoot is measured in MPa.

[0022] Furthermore, the pressure response coefficient, adsorption efficiency correction coefficient, desorption transport coefficient, and flow rate correction coefficient were all obtained through experimental calibration, including: The adsorption efficiency correction coefficient is obtained by detecting the residual concentration of total hydrocarbons in the gas after adsorption using a gas chromatograph and calculating the ratio of the actual adsorption amount to the theoretical adsorption amount. The total mass of all hydrocarbons in the desorbed gas is detected by gas chromatography. The ratio of the desorbed recovered mass to the adsorbed retained mass is calculated. Then, this ratio is calculated as the ratio of the theoretical desorption efficiency to obtain the desorption transport coefficient. A standard flow generator is used to introduce gas at a known flow rate into the device, the device flow monitoring data is recorded, and the ratio of the standard flow rate to the monitored flow rate is calculated to obtain the flow correction coefficient. Set different pressure target values, adjust the opening of the pressure relief valve, record the pressure change response curve, calculate the ratio of the actual pressure adjustment speed to the theoretical adjustment speed, and obtain the pressure response coefficient.

[0023] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a quantitative gas path device for collecting all hydrocarbons, including a collection tank on a support frame, a gas delivery component for gas introduction and export, a monitoring component for monitoring the pressure inside the tank, a pressure relief valve for maintaining adsorption pressure, a filter component connected inside the tank via a quick-release structure, and a conveying component for accelerating gas desorption. The quick-release structure, through snap-fit ​​and screw fixing, enables convenient assembly and disassembly of the filter components, significantly simplifying the operation process. The monitoring component and pressure relief valve work together to monitor and automatically adjust the gas pressure inside the tank in real time, ensuring a stable adsorption process. The conveying component connects the two filter sections, optimizing the gas path and promoting rapid gas desorption. This device effectively solves the problems of cumbersome operation and inconvenient assembly and disassembly in traditional methods, improving maintenance efficiency and reducing operational burden. By achieving quantitative collection and real-time pressure control, it significantly improves data accuracy and reliability. Simultaneously, the rational gas path design shortens the collection time and reduces interference from external impurities, thus fully meeting the core requirements of modern environmental monitoring for high efficiency, accuracy, and convenience. This invention also provides a coupling adsorption and desorption method for all hydrocarbons. Based on the aforementioned quantitative gas path device for all hydrocarbons, the method sequentially performs gas injection, two-stage filtration adsorption, pressure monitoring and maintenance, gas desorption, and convenient separation, regeneration, and replacement of filter components using a quick-release structure. This method provides crucial conditions for quantitative acquisition by precisely controlling the pressure of the adsorption process through monitoring components and pressure relief valves. The optimized gas flow path and active acceleration of gas desorption during the desorption stage improve the overall kinetic efficiency. The quick-release structure between the core filter components directly simplifies the physical process of maintenance. This method fundamentally improves acquisition accuracy and data reliability through integrated pressure control, ensuring quantitative monitoring. The optimized gas path and accelerated desorption mechanism significantly shorten the acquisition cycle and reduce the risk of external contamination. The quick-release design makes filter component replacement and system reset extremely simple, greatly reducing the operational burden and improving maintenance efficiency, thus making overall total hydrocarbon monitoring more efficient, accurate, and convenient. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a quantitative gas sampling device for all hydrocarbons provided in an embodiment of the present invention; Figure 2 A schematic diagram showing the disassembled second flange and limiting bolts provided in an embodiment of the present invention; Figure 3 A top view of the collection tank provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first fixing ring plate provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the relevant structure of the counterweight provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the relevant structure of the snap-fit ​​board provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the related structure of the second fixing plate provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure related to the first fixing plate provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the second fixed ring plate provided in an embodiment of the present invention.

[0025] Figure label: 10. Collection tank; 11. Support frame; 12. First flange; 13. First threaded groove; 14. Limiting hole; 15. First gas supply pipe; 16. Second gas supply pipe; 17. Third gas supply pipe; 18. Fourth gas supply pipe; 19. Sealing cover plate; 20. Second flange; 21. Second threaded groove; 22. Limiting bolt; 23. Fixing rod; 24. Lifting ring; 25. Barometer; 26. Pressure gauge; 27. Pressure relief valve; 28. First fixing ring plate; 2 9. Arc-shaped slot; 30. Snap-fit ​​rod; 31. First fixing plate; 32. Counterweight; 33. Arc-shaped snap-fit ​​plate; 34. Snap-fit ​​rod groove; 35. Third threaded groove; 36. Snap-fit ​​groove; 37. Second fixing plate; 38. Filter basket; 39. First air inlet; 40. Snap-fit ​​plate; 41. Third fixing plate; 42. Second air inlet; 43. Fixing sleeve; 44. Third air inlet; 45. Second fixing ring plate; 46. Threaded sleeve; 47. Filter bag. Detailed Implementation

[0026] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] The technical terms involved in this invention are explained below: PID stands for Proportional, Integral, and Derivative. In air pressure regulation logic, it is a closed-loop control algorithm based on deviation feedback. It dynamically adjusts control variables (such as valve opening and air pump power) to make the controlled air pressure quickly and stably reach the target value.

[0031] As mentioned in the background section, traditional total hydrocarbon collection methods have many drawbacks: cumbersome operation procedures and inconvenient disassembly and assembly of filter components lead to low efficiency in maintenance, replacement, and cleaning; insufficient collection accuracy prevents quantitative collection of total hydrocarbons, making it difficult to accurately obtain the actual concentration level of total hydrocarbons in the air; the lack of real-time pressure monitoring and control mechanisms makes it impossible to promptly grasp changes in total hydrocarbon concentration and take rapid countermeasures; and unreasonable gas transport path design results in long collection times, and gas purity is easily affected by impurities. These problems severely restrict the efficient implementation of total hydrocarbon monitoring and fail to meet the demands of modern environmental monitoring for efficiency, accuracy, and convenience.

[0032] To address the aforementioned issues, this embodiment provides a gas path device for quantitative collection of all hydrocarbons, suitable for efficient collection, accurate separation, and quantitative analysis of all hydrocarbon components in the air. By optimizing the device's structural design, incorporating a quick-release mechanism, a precise gas pressure control system, and a high-efficiency gas delivery and filtration component, and combining a scientific adsorption-desorption coupling process and calculation model, it achieves rapid quantitative collection, efficient separation, and accurate analysis of all hydrocarbons, improving the device's flexibility, stability, and the accuracy of monitoring data.

[0033] For example, this embodiment provides a quantitative gas sampling device for all hydrocarbons, including a support frame 11; a sampling tank 10 is disposed on the support frame 11; a gas conveying assembly is disposed on the sampling tank 10 for introducing and exporting gas; a monitoring assembly for monitoring the pressure inside the tank and a pressure relief valve 27 for maintaining the adsorption pressure inside the tank are disposed on the top of the sampling tank 10; a filter assembly and a conveying assembly are disposed inside the sampling tank 10 and are connected to each other; the conveying assembly is connected between the first filter section and the second filter section of the filter assembly to accelerate the gas desorption rate; the first filter section is connected to the inlet end of the gas conveying assembly, and the second filter section is connected to the outlet end of the gas conveying assembly; the first filter section and the second filter section are connected through... The quick-release structure is connected; the quick-release structure includes a first quick-release part and a second quick-release part; the first quick-release part includes a first fixing ring plate 28 and a first fixing plate 31 disposed inside the collection tank 10; the top of the first fixing ring plate 28 is snapped to the bottom of the first fixing plate 31 through a positioning snap-fit ​​mechanism; the first filter part is connected to the top of the first fixing plate 31; the second quick-release part includes a second fixing ring plate 45 disposed inside the collection tank 10; the top of the second fixing ring plate 45 is connected to a threaded sleeve 46, which is screwed to the first fixing plate 31; the second filter part is connected to the bottom of the second fixing ring plate 45.

[0034] The following is a detailed description of the total hydrocarbon quantitative gas sampling device provided in this embodiment, with reference to the accompanying drawings: like Figure 1 As shown, this embodiment provides a quantitative gas sampling device for all hydrocarbons, including: a sampling tank 10, a sealing cover plate 19, a gas delivery assembly, a quick-release structure, a filter assembly, and a conveying assembly. The specific structure and functions are as follows: Collection tank 10: It is cylindrical and provides a closed space for the collection, adsorption and desorption of total hydrocarbons; a support frame 11 is fixedly installed on its outer wall to stabilize the device on the ground; a first flange 12 is fixedly installed on the top, and eight sets of first threaded grooves 13 are opened inside the first flange 12.

[0035] Sealing cover 19: such as Figure 2 As shown, a second flange 20 is fixedly installed on the outer wall of the top of the collection tank 10. The bottom of the second flange 20 has eight sets of second threaded grooves 21. Limiting bolts 22 are spirally installed inside the second threaded grooves 21. The limiting bolts 22 are spirally installed inside the first threaded groove 13 to achieve sealing and fixing of the sealing cover 19 and the collection tank 10. Four sets of fixing rods 23 are fixedly installed on the outer wall of the sealing cover 19. Lifting rings 24 are provided on the outer wall of the fixing rods 23 to facilitate the lifting of the device and the adjustment of the tilt angle. A barometer 25 is fixedly installed on the top. A pressure gauge 26 is fixedly installed on the top of the barometer 25. A pressure relief valve 27 is provided on the outer wall. One end of the barometer 25 is fixedly installed below the sealing cover 19 for real-time monitoring of the air pressure inside the collection tank 10 and pressure regulation.

[0036] Gas delivery assembly: The inside of the collection tank 10 is provided with two sets of limiting holes 14. A first gas delivery pipe 15 and a third gas delivery pipe 17 are fixedly installed inside the two sets of limiting holes 14 respectively. A second gas delivery pipe 16 is fixedly installed inside the first gas delivery pipe 15 for inputting the gas to be tested. A fourth gas delivery pipe 18 is fixedly installed inside the third gas delivery pipe 17 for gas output and desorption pipeline connection.

[0037] Quick-release structure: includes a first quick-release section and a second quick-release section. For example... Figure 3 and 4 As shown, the first quick-release part includes a first fixing ring plate 28 fixedly installed inside the collection tank 10. The top of the first fixing ring plate 28 has two sets of arc-shaped slots 29, and two sets of snap-fit ​​rods 30 are fixedly installed thereon. Inside the collection tank 10, a first fixing plate 31 is provided. At the bottom of the first fixing plate 31, two sets of arc-shaped snap-fit ​​plates 33 are fixedly installed, and two sets of snap-fit ​​rod slots 34 are provided. The snap-fit ​​rods 30 are snapped into the snap-fit ​​rod slots 34, and the arc-shaped snap-fit ​​plates 33 are snapped into the arc-shaped slots 29, achieving quick snap-fit ​​fixing between the first fixing plate 31 and the first fixing ring plate 28. The second quick-release part includes a third threaded groove 35 at the bottom of the first fixing plate 31, and a second fixing ring plate 45 is provided inside the collection tank 10. Figure 9 As shown, a threaded sleeve 46 is fixedly installed on the top of the second fixing ring plate 45. The threaded sleeve 46 is spirally installed inside the third threaded groove 35, realizing the rapid spiral fixation of the second fixing ring plate 45 and the first fixing plate 31; at the same time, as Figure 8 As shown, the second quick-release part also includes a snap-fit ​​groove 36 opened on the top of the first fixing plate 31, and a snap-fit ​​plate 40 is provided inside the collection tank 10. The snap-fit ​​plate 40 is snapped into the snap-fit ​​groove 36 to enhance the structural stability.

[0038] Filtering and conveying components: The filtering component includes a first filtering section and a second filtering section, with the following specific structure: Figure 5 and 7 As shown, a second fixed plate 37 is fixedly installed on the top of the first fixed plate 31, and a filter basket 38 is fixedly installed inside the second fixed plate 37. A first gas inlet 39 is opened inside the filter basket 38, and the filter basket 38 is filled with activated carbon adsorbent for adsorbing and retaining all hydrocarbon components; For example... Figure 9 As shown, a filter bag 47 is fixedly installed at the bottom of the second fixed ring plate 45 for filtering gas impurities. Figure 6 As shown, in the conveying assembly, a third fixing plate 41 is fixedly installed inside the snap-fit ​​plate 40. The third fixing plate 41 has twelve sets of second air supply holes 42 inside. A fixing sleeve 43 is fixedly installed inside the second air supply holes 42. Twenty-four sets of third air supply holes 44 are opened on the outer wall of the fixing sleeve to optimize the gas conveying path and improve gas flow and desorption efficiency. A counterweight block 32 is fixedly installed at the bottom of the first fixing plate 31 to enhance the stability of the first fixing plate 31.

[0039] By way of example, based on the above-mentioned quantitative gas path device for collecting all hydrocarbons, this embodiment also provides an adsorption-desorption coupling method for all hydrocarbons, the specific steps of which are as follows: Step 1: The gas to be tested is injected into the collection tank 10 through the first gas supply pipe 15 and the second gas supply pipe 16. The gas to be tested flows sequentially through the adsorbent layer in the filter basket 38, the second gas supply hole 42 and the third gas supply hole 44 of the fixing sleeve 43. The pressure inside the tank is monitored by the barometer 25 and the adsorption pressure is maintained at 0.1-0.3 MPa through the pressure relief valve 27. All hydrocarbon components are adsorbed and retained by the activated carbon adsorbent in the filter basket 38.

[0040] Step 2: After the gas is filtered by the filter bag 47, it is discharged through the fourth gas supply pipe 18. After the gas supply is stopped, it is connected to the vacuum system through the desorption pipeline composed of the third gas supply pipe 17 and the fourth gas supply pipe 18, and the gas is heated to 80-120℃ for desorption.

[0041] Step 3: Use the twenty-four sets of third air outlets 44 of the fixed sleeve 43 to transport the airflow, improve the gas desorption efficiency, and maintain the pressure fluctuation range of the pressure gauge within ±5kPa.

[0042] Step 4: After desorption is completed, the first fixing plate 31 and the second fixing ring plate 45 are separated by the quick-release structure. The filter basket 38 is taken out for adsorbent regeneration. After replacing the filter bag 47, the quick-release structure is reassembled. The device tilt angle is adjusted by the lifting ring 24 in conjunction with the support frame 11, and the system is reset.

[0043] As a further preferred embodiment, in this embodiment, the pressure inside the tank is monitored by a monitoring component, and combined with PID pressure control logic that introduces a pressure response coefficient, the pressure relief valve 27 is used to maintain the tank at a preset adsorption pressure. Based on the pre-constructed total hydrocarbon adsorption capacity calculation model and combined with the adsorption efficiency correction coefficient, the mass of total hydrocarbon components adsorbed and retained is calculated in real time. Based on the pre-constructed desorption efficiency calculation model, the desorption efficiency is calculated in real time by combining the desorption transmission coefficient and the flow correction coefficient. Among them, the pressure response coefficient, adsorption efficiency correction coefficient, desorption transport coefficient and flow rate correction coefficient were all obtained through experimental calibration. The interpretable calculation model for total hydrocarbon adsorption capacity is specifically constructed as follows: Based on the Langmuir adsorption isotherm equation, and combined with the adsorption environment parameters of this device and the efficiency loss in the actual adsorption process, an adsorption efficiency correction coefficient K1 (with a value range of 0.92-0.98, calibrated experimentally, characterizing the deviation between the actual adsorption efficiency and the theoretical adsorption efficiency, affected by adsorbent packing density, gas flow rate, and temperature uniformity) is introduced to establish a total hydrocarbon adsorption capacity calculation model. This model is used to accurately predict the actual adsorption capacity of all hydrocarbon components during the adsorption process, providing a theoretical basis for quantitative collection.

[0044] Basic form of Langmuir adsorption isotherm equation: ; in, This represents the theoretical equilibrium adsorption capacity (mg / g). The saturation adsorption capacity is (mg / g). The adsorption equilibrium constant (Pa) - ¹), The partial pressure (Pa) of the total hydrocarbon components.

[0045] The actual equilibrium adsorption capacity model after introducing the adsorption efficiency correction factor K1: ; Partial pressures of all hydrocarbon components Derived from barometer monitoring data: ; in, The pressure inside the tank (Pa) is read from a pressure gauge, and the value ranges from 0.1 to 0.3 MPa. This represents the total mole fraction of hydrocarbons in the gas being tested (dimensionless).

[0046] To account for the effect of temperature on the adsorption equilibrium constant, a correction is made using the van der Hoff equation. : ; in, Reference temperature The adsorption equilibrium constant (Pa) at the following conditions - ¹), The adsorption enthalpy change is expressed in J / mol. It is the universal gas constant (8.314 J / (mol·K)). The adsorption temperature is K.

[0047] Final calculation model for actual total hydrocarbon adsorption: .

[0048] This model allows for the accurate calculation of the actual equilibrium adsorption capacity of the activated carbon adsorbent in the filter basket for all hydrocarbons, based on the pressure and temperature data monitored by the device, the known mole fraction of total hydrocarbons in the gas to be tested, and the calibrated K1 coefficient. This avoids calculation deviations caused by non-ideal factors during the adsorption process and improves the accuracy of quantitative data collection.

[0049] The interpretable desorption efficiency calculation model is specifically constructed as follows: Desorption efficiency is a key indicator for evaluating the effectiveness of the desorption process. Based on the law of conservation of mass and considering factors such as gas transmission loss and flow measurement deviation during desorption, a desorption transmission coefficient K2 (range 0.95-0.99, experimentally calibrated, characterizing the transmission efficiency of the whole hydrocarbon component from the adsorbent to the outlet device, affected by the uniformity of desorption temperature and pipeline sealing) and a flow correction coefficient K3 (range 0.96-1.02, experimentally calibrated, correcting for systematic errors in the flow measurement process) are introduced to establish a desorption efficiency calculation model for accurately evaluating the recovery effect of the whole hydrocarbon component during desorption.

[0050] Desorption efficiency Defined as the ratio of the mass of total hydrocarbons recovered by desorption to the mass of total hydrocarbons retained by adsorption: ; in, This represents the actual mass (mg) of total hydrocarbons recovered through desorption. The mass (mg) of total hydrocarbons retained by adsorption.

[0051] Total hydrocarbon mass retained by adsorption Derivation based on the adsorption capacity calculation model and adsorbent mass: ; in, The mass (g) of activated carbon adsorbent in the filter basket.

[0052] Mass of total hydrocarbons recovered by desorption Calculated using desorption gas flow rate, concentration, desorption time, and K2 and K3 coefficients: ; in, The desorption time is in seconds. The instantaneous flow rate of the desorbed gas is (m³ / s). The instantaneous concentration of total hydrocarbons in the desorbed gas (mg / m³).

[0053] Based on the gas transport characteristics of the device, the desorbed gas flow rate The derivation is related to the number and diameter of the gas inlets on the fixed sleeve and the pressure difference inside the tank, and is simplified based on fluid mechanics principles: ; in, The flow coefficient (calibrated experimentally) is the flow rate coefficient. This refers to the number of third air inlets (24 sets in this device). The diameter of the third air inlet (m). The instantaneous pressure difference (Pa) between the tank and the vacuum system. The density of the desorbed gas is expressed in kg / m³.

[0054] Final desorption efficiency calculation model:

[0055] This model allows for precise calculation of desorption efficiency, providing a basis for optimizing parameters such as desorption temperature and time, and ensuring efficient recovery of all hydrocarbon components.

[0056] The explainable pressure regulation logic is as follows: To maintain a stable pressure within the tank of 0.1-0.3 MPa during adsorption and a pressure fluctuation range within ±5 kPa during desorption, a pressure regulation logic based on PID control and incorporating a pressure response coefficient K4 was established. K4 is the pressure response coefficient (range 0.93-0.97, experimentally calibrated, characterizing the response relationship between pressure relief valve opening adjustment and tank pressure changes, influenced by the valve characteristics of the pressure relief valve and the gas flow within the tank).

[0057] Set adsorption pressure target value (0.1-0.3MPa), the actual pressure inside the tank is collected in real time by a barometer. (MPa), calculate pressure deviation .

[0058] The pressure relief valve opening is adjusted using a PID control algorithm combined with the K4 coefficient. : ; in, This is the proportionality coefficient. The integral coefficient is... The coefficients are differential coefficients, which are optimized through experimental calibration.

[0059] when ( To allow for maximum overshoot, increase the pressure relief valve opening to quickly release the pressure inside the tank; when When necessary, the pressure relief valve opening is reduced to maintain the pressure inside the tank; this logic enables precise and stable control of the pressure inside the tank, ensuring the smooth progress of the adsorption and desorption processes.

[0060] The specific method for calibrating the K coefficient is as follows: The K1 (adsorption efficiency correction coefficient), K2 (desorption transport coefficient), K3 (flow rate correction coefficient), and K4 (pressure response coefficient) mentioned above were all obtained through experimental calibration. The specific calibration procedure is as follows: K1 calibration: Prepare a standard full hydrocarbon gas of known concentration, and conduct an adsorption experiment under the set adsorption pressure (0.2MPa) and temperature (298K). Detect the remaining concentration of full hydrocarbons in the gas after adsorption using a gas chromatograph, and calculate the ratio of the actual adsorption amount to the theoretical adsorption amount, which is K1.

[0061] K2 calibration: Based on the above adsorption experiment, a desorption experiment was conducted (desorption temperature 100℃). The total mass of all hydrocarbons in the desorbed gas was detected by gas chromatography. The ratio of the desorption recovered mass to the adsorption retained mass (before correction) and the ratio of this ratio to the theoretical desorption efficiency (set to 99%) is K2.

[0062] K3 calibration: A standard flow generator is used to introduce gas at a known flow rate into the device, the device flow monitoring data is recorded, and the ratio of the standard flow rate to the monitored flow rate is calculated as K3.

[0063] K4 calibration: Set different pressure target values, adjust the opening of the pressure relief valve, record the pressure change response curve, and calculate the ratio of the actual pressure adjustment speed to the theoretical adjustment speed, which is K4.

[0064] For example, this embodiment also applies the above-mentioned total hydrocarbon quantitative collection gas path device and method, and the specific implementation process is as follows: The assembly process for the total hydrocarbon quantitative gas sampling device is as follows: The support frame 11 is fixedly installed on the outer wall of the collection tank 10, and the collection tank 10 is stably placed on the ground by the support frame 11. The first gas supply pipe 15 (containing the second gas supply pipe 16) and the third gas supply pipe 17 (containing the fourth gas supply pipe 18) are fixedly installed in the limiting hole 14 inside the collection tank 10. The first fixing ring plate 28 is fixedly installed inside the collection tank 10. The arc-shaped snap-fit ​​plate 33 at the bottom of the first fixing plate 31 is aligned with the arc-shaped snap-fit ​​groove 29 of the first fixing ring plate 28. At the same time, the snap-fit ​​rod 30 is snapped into the snap-fit ​​rod groove 34 to achieve the snap-fit ​​fixation between the first fixing plate 31 and the first fixing ring plate 28. The threaded sleeve 46 at the top of the second fixing ring plate 45 is screwed into the third threaded groove 35 at the bottom of the first fixing plate 31 to fix the second fixing ring plate 45 to the first fixing plate 31. The snap-fit ​​plate 40 is snapped into the snap-fit ​​groove 36 on the top of the first fixing plate 31 to complete the quick-release structure assembly. A filter basket 38 (filled with activated carbon adsorbent) is fixedly installed inside the second fixed plate 37, and the second fixed plate 37 is fixedly installed on the top of the first fixed plate 31; a third fixed plate 41 is fixedly installed inside the snap-fit ​​plate 40, and a fixed sleeve 43 is fixedly installed inside the second air outlet 42 of the third fixed plate 41; a filter bag 47 is fixedly installed at the bottom of the second fixed ring plate 45. Place the sealing cover 19 on top of the collection tank 10, so that the first flange 12 and the second flange 20 are tightly attached. Then, screw the limiting bolts 22 into the second thread groove 21 and the first thread groove 13 in sequence to achieve the sealing and fixing of the sealing cover 19 and the collection tank 10. Check the installation integrity and sealing of barometer 25, bar gauge 26 and pressure relief valve 27 to ensure that the bar pressure monitoring and control functions are normal.

[0065] The specific process for calibrating the K coefficient is as follows: K1 calibration: setting the total hydrocarbon mole fraction Standard gas, set adsorption pressure ,temperature An adsorption experiment was conducted using the apparatus. The residual concentration of total hydrocarbons in the gas after adsorption was detected by gas chromatography. The actual adsorption capacity was calculated to be 148.2 mg / g, and the theoretical adsorption capacity was 153.1 mg / g. ; K2 calibration: Based on the above adsorption experiments, a desorption temperature of 100℃ was set, and a desorption experiment was conducted. Gas chromatography analysis showed that the mass of total hydrocarbons recovered through desorption was 732 mg, and the mass of total hydrocarbons retained through adsorption was 747 mg. The uncorrected desorption efficiency was 732 / 747≈98.0%. The theoretical desorption efficiency was set at 99%. ; K3 Calibration: Using a standard flow generator, gas flow rate of 0.001 m³ / s is introduced. The device monitors a flow rate of 0.00102 m³ / s. Then... ; K4 Calibration: Set the target pressure value to 0.2 MPa, adjust the pressure relief valve opening, and record the actual pressure adjustment rate as 0.018 MPa / s and the theoretical adjustment rate as 0.019 MPa / s. .

[0066] In this embodiment, the specific process of an adsorption-desorption coupling method for all hydrocarbons includes: Adsorption process: The gas to be tested is injected into the collection tank 10 through the first gas supply pipe 15 and the second gas supply pipe 16. The gas flows sequentially through the activated carbon adsorbent layer in the filter basket 38, the second gas supply hole 42, and the third gas supply hole 44 of the fixed sleeve 43. The pressure inside the tank is read by the pressure gauge 26. Combined with the PID pressure control logic with the K4 coefficient, the pressure inside the tank is adjusted by the pressure relief valve 27 to maintain an adsorption pressure of 0.2 MPa. According to the total hydrocarbon adsorption capacity calculation model, the calibrated K1=0.968 is substituted to calculate the total hydrocarbon mass adsorbed and retained in real time. The gas is filtered by the filter bag 47 and then discharged through the fourth gas supply pipe 18.

[0067] Desorption process: After the gas intake is stopped, the desorption pipeline consisting of the third gas supply pipe 17 and the fourth gas supply pipe 18 is connected to the vacuum system to heat the gas to 100℃ for desorption; the gas flow is optimized by using the 24 sets of third gas supply holes 44 of the fixed sleeve 43, and the pressure change is monitored by the pressure gauge 26 to ensure that the pressure fluctuation range is within ±5kPa; according to the desorption efficiency calculation model, the calibrated K2=0.989 and K3=0.980 are substituted to calculate the desorption efficiency in real time. System Reset: After desorption is completed, the first fixed plate 31 and the second fixed ring plate 45 are separated by the quick-release structure. The filter basket 38 is taken out for adsorbent regeneration and the filter bag 47 is replaced. The quick-release structure is reassembled, and the tilt angle of the device is adjusted by the lifting ring 24 in conjunction with the support frame 11 to complete the system reset and prepare for the next collection.

[0068] The specific computational model application example is as follows: Given: , , , , , , , , (Flow coefficient) , , Average , , The average is 0.205 mg / m³. , K1=0.968, K2=0.989, K3=0.980.

[0069] Calculate the adsorption equilibrium constant : ; Calculate the actual equilibrium adsorption amount : ; Calculate the total hydrocarbon mass retained by adsorption. : ; Calculate the desorption gas flow rate : ; Calculate the total hydrocarbon mass recovered by desorption : (The example data here is for demonstration purposes only; actual calculations should be performed based on integration of real-time monitoring data.) Calculate desorption efficiency : (In practical applications, real monitoring data should be used; this is a model demonstration only.)

[0070] This example demonstrates that the computational model incorporating the K coefficient can more accurately reflect the adsorption and desorption processes of all hydrocarbons under actual operating conditions, providing reliable theoretical support for quantitative sampling.

[0071] In summary, compared with existing total hydrocarbon collection methods, the total hydrocarbon quantitative collection gas path device provided by this invention has the following advantages: This invention utilizes a quick-release mechanism composed of a first quick-release section and a second quick-release section spirally connected to achieve rapid disassembly and assembly of filter components, significantly improving the convenience of maintenance, replacement, cleaning, and unblocking, as well as the flexibility of device use. By introducing coefficients K1, K2, K3, and K4 to correct deviations in adsorption efficiency, desorption transport, flow measurement, and pressure response, and combining precise total hydrocarbon adsorption calculation models, desorption efficiency calculation models, and PID pressure control logic, the adsorption pressure can be maintained stable at 0.1-0.3 MPa, and the desorption pressure fluctuation within ±5 kPa. This achieves precise quantitative adsorption and efficient desorption of total hydrocarbon components, significantly improving the accuracy of monitoring data. Simultaneously, the optimized gas delivery path, consisting of a filter basket, fixed sleeve, and filter bag, along with a multi-set gas outlet design, effectively shortens collection time, filters impurities, and improves gas purity and desorption efficiency. The rational configuration of the support frame, counterweight, and lifting ring balances device stability and operational convenience. The overall structure is practical and reliable, fully meeting the modern environmental monitoring requirements for high efficiency, accuracy, and convenience.

[0072] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A device for quantitative collection of all hydrocarbons in a gas path, characterized in that, Including support frame (11); A collection tank (10) is provided on the support frame (11); The collection tank (10) is equipped with a gas delivery assembly for introducing and exporting gas; The top of the collection tank (10) is equipped with a monitoring component for monitoring the pressure inside the tank and a pressure relief valve (27) for maintaining the adsorption pressure inside the tank. The collection tank (10) is provided with a filter assembly and a conveying assembly that are connected to each other; the conveying assembly is connected between the first filter section and the second filter section of the filter assembly to accelerate the gas desorption rate. The first filter section is connected to the air inlet of the gas delivery assembly, and the second filter section is connected to the air outlet of the gas delivery assembly. The first filter section and the second filter section are connected by a quick-release structure; The quick-release structure includes a first quick-release part and a second quick-release part; The first quick-release part includes a first fixing ring plate (28) and a first fixing plate (31) disposed inside the collection tank (10); the top of the first fixing ring plate (28) is connected to the bottom of the first fixing plate (31) by a positioning snap-fit ​​mechanism; the first filter part is connected to the top of the first fixing plate (31); The second quick-release part includes a second fixing ring plate (45) disposed inside the collection tank (10); a threaded sleeve (46) is connected to the top of the second fixing ring plate (45), and the threaded sleeve (46) is screwed to the first fixing plate (31); the second filter part is connected to the bottom of the second fixing ring plate (45); The first filter section includes a second fixing plate (37) fixed to the top of the first fixing plate (31); A filter basket (38) is fixed on the second fixing plate (37); the filter basket (38) is provided with a plurality of first air supply holes (39) that communicate with the air inlet end of the air supply assembly; the filter basket (38) is filled with activated carbon adsorbent. The conveying assembly includes a snap-fit ​​plate (40) snapped onto the top of the first fixing plate (31). The snap-fit ​​plate (40) has a plurality of second air supply holes (42); each second air supply hole (42) is fitted with a fixing sleeve (43); the fixing sleeve (43) has a plurality of third air supply holes (44) facing the air outlet direction of the filter basket (38); the second air supply holes (42) are connected to the second filter section.

2. The total hydrocarbon quantitative gas sampling device according to claim 1, characterized in that, The second filtration section includes a filter bag (47) fixed to the bottom of the second fixing ring plate (45); the filter bag (47) is connected to the second air supply hole (42) and the air outlet of the air supply assembly, respectively.

3. The total hydrocarbon quantitative gas sampling device according to claim 1, characterized in that, The second quick-release part also includes a snap-fit ​​groove (36) opened on the top of the first fixing plate (31); the snap-fit ​​plate (40) is snap-fitted into the snap-fit ​​groove (36).

4. The total hydrocarbon quantitative gas sampling device according to claim 1, characterized in that, The positioning and locking mechanism includes an arc-shaped locking plate (33) disposed at the bottom of the first fixed plate (31), a locking rod groove (34) opened at the bottom of the first fixed plate (31), an arc-shaped locking groove (29) opened at the top of the first fixed ring plate (28), and a locking rod (30) disposed at the top of the first fixed ring plate (28). The arc-shaped snap-fit ​​plate (33) is snapped into the arc-shaped snap-fit ​​groove (29); the snap-fit ​​rod groove (34) is snapped into the snap-fit ​​rod (30).

5. The total hydrocarbon quantitative gas sampling device according to claim 1, characterized in that, The gas delivery assembly includes a limiting hole (14) on the wall of the collection tank (10); one set of limiting holes (14) is connected to a first gas delivery pipe (15), and another set of limiting holes (14) is connected to a third gas delivery pipe (17); the inlet end of the first gas delivery pipe (15) is connected to a second gas delivery pipe (16); and the outlet end of the third gas delivery pipe (17) is connected to a fourth gas delivery pipe (18).

6. A method for coupling adsorption and desorption of all hydrocarbons, based on the quantitative gas path device for collecting all hydrocarbons as described in any one of claims 1-5, characterized in that, include: The gas to be tested is injected into the collection tank (10) through the gas inlet of the gas delivery assembly. The gas to be tested flows through the first filter section of the filter assembly. The pressure inside the tank is monitored by the monitoring assembly. The adsorption pressure inside the tank is maintained by the pressure relief valve (27). The total hydrocarbon components in the gas to be tested are adsorbed and retained by the first filter section. The filtered gas passes through the conveying assembly and enters the second filtration section of the filtration assembly. The gas that is filtered again is led out from the outlet of the gas conveying assembly to the vacuum system for desorption. A conveying assembly is used to transport the gas flow, thereby accelerating the gas desorption rate; After desorption is completed, the first filter section and the second filter section are separated by a quick-release structure. The first filter section is then regenerated with adsorbent. After the second filter section is replaced, the first filter section and the replaced second filter section are reassembled using the quick-release structure to reset the total hydrocarbon quantitative gas sampling device.

7. The adsorption-desorption coupling method for all hydrocarbons according to claim 6, characterized in that, The pressure inside the tank is monitored by the monitoring component, and the adsorption pressure inside the tank is maintained by the pressure relief valve (27). During the process of the full hydrocarbon component in the gas to be tested being adsorbed and retained by the first filter section, the pressure inside the tank is monitored by the monitoring component. Combined with the PID gas pressure control logic that introduces a pressure response coefficient, the pressure relief valve (27) is used to maintain the tank at the preset adsorption pressure. Based on the pre-constructed total hydrocarbon adsorption capacity calculation model and combined with the adsorption efficiency correction coefficient, the mass of total hydrocarbon components adsorbed and retained is calculated in real time. The filtered gas enters the second filtration section of the filtration assembly through the conveying assembly, and the gas filtered again is led out to the vacuum system from the gas outlet of the gas conveying assembly. During the desorption process, the desorption efficiency is calculated in real time based on the pre-constructed desorption efficiency calculation model, combined with the desorption transmission coefficient and the flow correction coefficient. The pressure response coefficient, adsorption efficiency correction coefficient, desorption transport coefficient, and flow rate correction coefficient were all obtained through experimental calibration.

8. The adsorption-desorption coupling method for all hydrocarbons according to claim 7, characterized in that, The total hydrocarbon adsorption capacity calculation model is based on the Langmuir adsorption isotherm equation. The specific formula of the Langmuir adsorption isotherm equation with the adsorption efficiency correction coefficient is as follows: In the formula, This represents the actual equilibrium adsorption capacity, in mg / g. This is the adsorption efficiency correction factor; The saturation adsorption capacity is expressed in mg / g. It is the adsorption equilibrium constant; The partial pressure of the total hydrocarbon components is given in Pa. In the formula, The adsorption pressure inside the tank is expressed in Pa. The mole fraction of total hydrocarbons in the gas to be tested; By introducing correction coefficients for the van der Hoff equation To reduce the effect of temperature on the adsorption equilibrium constant, the specific formula is as follows: In the formula, Reference temperature The adsorption equilibrium constant at Pa - ¹; For adsorption enthalpy change, J / mol, Here is the universal gas constant, J / (mol·K). The adsorption temperature is K; It is a natural exponential function; The specific expression of the final total hydrocarbon adsorption capacity calculation model is as follows: The specific expression of the desorption efficiency calculation model is as follows: In the formula, For desorption efficiency; The mass of activated carbon adsorbent is expressed in grams. For flow coefficient; This refers to the number of third air inlets; The diameter of the third air inlet is in meters (m). The instantaneous pressure difference between the tank and the vacuum system, expressed in Pa. The density of the desorbed gas is kg / m³ 3 ; This represents the instantaneous concentration of total hydrocarbons in the desorbed gas. The desorption transmission coefficient; This is the flow correction factor; The total desorption time is in seconds. The pressure relief valve opening is adjusted by incorporating a PID air pressure control logic with an introduced pressure response coefficient. The specific formula is as follows: In the formula, This is the pressure response coefficient; This is the proportionality coefficient. The integral coefficient is... These are the differential coefficients; Pressure deviation, MPa; In the formula, The target adsorption pressure is expressed in MPa. The target adsorption pressure is expressed in MPa. Among them, when Then increase the opening of the pressure relief valve; when When this happens, reduce the opening of the pressure relief valve; The maximum allowable overshoot is measured in MPa.

9. The adsorption-desorption coupling method for all hydrocarbons according to claim 7, characterized in that, The pressure response coefficient, adsorption efficiency correction coefficient, desorption transport coefficient, and flow rate correction coefficient were all obtained through experimental calibration, including: The adsorption efficiency correction coefficient is obtained by detecting the residual concentration of total hydrocarbons in the gas after adsorption using a gas chromatograph and calculating the ratio of the actual adsorption amount to the theoretical adsorption amount. The total mass of all hydrocarbons in the desorbed gas is detected by gas chromatography. The ratio of the desorbed recovered mass to the adsorbed retained mass is calculated. Then, this ratio is calculated as the ratio of the theoretical desorption efficiency to obtain the desorption transport coefficient. A standard flow generator is used to introduce gas at a known flow rate into the device, the device flow monitoring data is recorded, and the ratio of the standard flow rate to the monitored flow rate is calculated to obtain the flow correction coefficient. Set different pressure target values, adjust the opening of the pressure relief valve, record the pressure change response curve, calculate the ratio of the actual pressure adjustment speed to the theoretical adjustment speed, and obtain the pressure response coefficient.

Images