Online sampling device and vacuum desorption system with same

Abstract

The utility model provides an on-line sampling device and a vacuum desorption system with the same, the on-line sampling device comprises a sampling unit and a control unit, and the control unit is in communication connection with the sampling unit; the sampling unit comprises a cooling part and a material storage part, and the material storage part is used for storing materials cooled by the cooling part; the cooling container is provided with a feed port, an extraction opening and a discharge port; and the control unit is used for enabling the adsorbent in the vacuum desorption device to enter the cooling container after the cooling container is vacuumized, and enabling the material in the cooling container to enter the material storage part after the material is cooled to a preset temperature. Through the vacuum sampling design with a cooling function, vacuum sampling is carried out on materials in a high-temperature and high-vacuum environment on the basis that the materials are not damaged and the operation of a vacuum desorption device is not influenced; an online sampling device is arranged in the vacuum desorption system, data such as desorption efficiency and stability of the material in the vacuum desorption process can be monitored in real time, and data support is provided for large-scale industrial application.

Description

Technical Field

[0001] The utility model relates to the field of vacuum desorption, in particular to an online sampling device and a vacuum desorption system having the same. Background Art

[0002] With the rapid growth of human energy consumption, CO2 emissions have also increased dramatically, and the resulting global warming has also had a huge impact on the production and life of many countries. In order to slow down global warming, countries have formulated medium- and long-term CO2 emission reduction plans, and carbon capture, utilization and storage (CCUS) is one of the key technologies to reduce carbon emissions.

[0003] There are two steps in the carbon capture process: adsorption and desorption of carbon dioxide. Adsorption refers to the use of adsorbents (such as molecular sieves, activated carbon, silica gel, etc.) to adsorb carbon dioxide from flue gas. The adsorption process is usually carried out at a lower pressure and higher temperature. After the adsorbent is heated to a certain temperature, it comes into contact with the flue gas and adsorbs carbon dioxide. Desorption refers to the desorption and removal of carbon dioxide that has been adsorbed on the adsorbent. The desorbed carbon dioxide is compressed and refrigerated, and finally liquefied and stored. This process is usually called carbon dioxide stripping or regeneration.

[0004] When using a vacuum desorption device to vacuum desorb solid amines, stable online sampling is very necessary. The collected desorption data not only affects the calculation of carbon dioxide capture efficiency and the evaluation of the material cycle life, but also has a very important reference value for the structural design of the vacuum desorption device. However, the existing vacuum desorption devices involve less sampling and cannot provide accurate data for large-scale industrial applications. Utility Model Content

[0005] Based on the problems existing in the prior art, the utility model provides an online sampling device and a vacuum desorption system having the same. The specific scheme is as follows:

[0006] In the first part, the present application proposes an online sampling device for sampling a carbon capture vacuum desorption device, comprising a sampling unit and a control unit, wherein the control unit is communicatively connected to the sampling unit;

[0007] The sampling unit comprises a cooling part and a material storage part, wherein the cooling part is provided with a cooling container for cooling the material, and the material storage part is used to store the material cooled by the cooling part;

[0008] The cooling container is provided with a feed port, an air extraction port, and a discharge port, wherein the air extraction port is used to connect to an external vacuum extraction device, the feed port is used to connect to an external vacuum desorption device, and the discharge port is connected to the material storage part;

[0009] The control unit is used to allow the adsorbent in the vacuum desorption device to enter the cooling container after the cooling container is evacuated, and to allow the material in the cooling container to enter the material storage portion after the material is cooled to a preset temperature.

[0010] In some specific embodiments, the cooling unit is further provided with a dust collecting unit connected to the cooling container;

[0011] The cooling container is provided with an air blowing port, and the air blowing port is used to introduce gas into the cooling container after the material is transferred to the material storage part, so as to blow the remaining material into the dust collecting part.

[0012] In some specific embodiments, the feed port, and / or the air suction port, and / or the discharge port, and / or the air blowing port are provided with electric valves which are communicatively connected to the control unit.

[0013] In some specific embodiments, an interlayer space is provided between the outer wall and the inner wall of the cooling container to achieve heat insulation treatment.

[0014] In some specific embodiments, an observation window is provided on the cooling container, and the observation window is used to observe the internal situation of the cooling container.

[0015] In some specific embodiments, the material storage portion includes a feed pipe, a connection end, a feed valve and a storage container, and the control unit is communicatively connected to the feed valve;

[0016] The feed pipe is connected to the discharge port and the connection end respectively, the feed valve is connected to the feed pipe, and the storage container is detachably connected to the connection end.

[0017] In some specific embodiments, a cooling pipe for containing a cooling liquid is provided in the cooling container.

[0018] In some specific embodiments, the cooling unit further includes a temperature detection device communicatively connected to the control unit, and the temperature detection device is located in the cooling container and is used to detect the temperature of the material in the cooling container.

[0019] In the second part, the present application proposes a vacuum desorption system, a vacuum desorption device, a vacuum pumping device and one or more online sampling devices as described in any one of the first part, the sampling unit in the online sampling device is located in the vacuum desorption device, and the vacuum pumping device is connected to the vacuum desorption device and the exhaust ports in some or all of the online sampling devices.

[0020] In some specific embodiments, the vacuum desorption device is provided with a plurality of rotating blades for stirring, and the sampling unit of the online sampling device is located between the rotating blades.

[0021] Beneficial effects: The utility model provides an online sampling device and a vacuum desorption system having the same. The online sampling device uses a vacuum sampling design with a cooling function to perform vacuum sampling of materials in a high-temperature and high-vacuum environment without damaging the materials and affecting the operation of the vacuum desorption device. The vacuum desorption system has a built-in online sampling device, which can monitor data such as desorption efficiency and material stability during the vacuum desorption process in real time, providing data support for large-scale industrial applications.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the online sampling device module of the utility model;

[0025] Figure 2 It is a specific structural schematic diagram of the online sampling device of the utility model;

[0026] Figure 3 It is a schematic diagram of the structure of the vacuum desorption system of the utility model.

[0027] Figure markings: 1-cooling section; 2-storage section; 3-control unit; 4-vacuum desorption device; 5-vacuum extraction device; 11-cooling container; 12-dust collecting section; 13-temperature detection device; 14-pressure gauge; 15-cooling pipe; 21-feeding pipe; 22-connecting end; 23-discharge valve; 24-storage container; A1-feeding port; A2-discharge port; A3-exhaust port; A4-venting port; A5-blowing port; A6-liquid inlet; A7-liquid outlet. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] This embodiment proposes an online sampling device, which is applied to a vacuum desorption device, and can achieve stable sampling and cooling of materials in a high-temperature and high-vacuum environment, and monitor the changes in desorption efficiency and material properties in the desorption device in real time, providing data support for large-scale industrial applications. The structure of the online sampling device is shown in the attached manual. Figure 1 and 2 The specific plan is as follows:

[0031] An online sampling device for sampling a carbon capture vacuum desorption device 4 includes a sampling unit and a control unit 3. The sampling unit is located in the vacuum desorption device 4 and is used to obtain sampling data. The control unit 3 is connected to the sampling unit in communication and is used to control the sampling unit to complete the sampling work. Specifically, the control unit 3 is used to allow the adsorbent in the vacuum desorption device 4 to enter the cooling container 11 after the cooling container 11 is evacuated, and to allow the material in the cooling container 11 to enter the material storage part 2 after it is cooled to a preset temperature. The control unit 3 can select a common controller such as FPGA, computer, server, etc.

[0032] The sampling unit includes a cooling part 1 and a storage part 2. Among them, the cooling part 1 is used to cool the material, and the storage part 2 is used to store the material cooled by the cooling part 1. Since the vacuum desorption device 4 generally needs to be heated to complete desorption, the temperature of the adsorbent material after desorption is relatively high, and cooling treatment is required after the adsorbent is collected. In this embodiment, the cooling part 1 is configured to first cool the adsorbent from the vacuum desorption device 4, and then store it in the storage part 2 for subsequent processing. The cooling part 1 is connected to the storage part 2, the vacuum desorption device 4 is connected to the cooling part 1, and the storage part 2 is installed on the online sampling device in a detachable connection manner, which is convenient for subsequent processing of the material in the storage part 2.

[0033] The online sampling device of this embodiment has the characteristics of high air tightness and high temperature resistance, can perform sampling work in a high-temperature vacuum environment, realize stable sampling and cooling of materials, and is connected to the control unit 3 to realize online sampling, and is suitable for vacuum desorption devices 4 for various carbon capture.

[0034] Among them, the sampled adsorbent needs to have a certain fluidity, and can be a small particle solid material or a liquid material, so as to better complete the heat dissipation in the cooling part 1. Taking solid amine as an example, solid amine as an adsorbent can adsorb carbon dioxide. The solid amine adsorbed with carbon dioxide is input into the vacuum desorption device 4 for vacuum desorption, and the carbon dioxide therein can be desorbed. After that, the solid amine remains in the vacuum desorption device 4 in the form of powder. Using the online sampling device of this embodiment, the solid amine at any time during the whole desorption process can be collected to obtain desorption data. The sampled adsorbent can be a powder or small particle solid amine material with good fluidity, or a liquid amine material.

[0035] The online sampling device of this embodiment can be installed and arranged at any position in the vacuum desorption device 4, and can realize online sampling at different sampling positions without affecting the normal operation of the device, so as to facilitate the analysis of the desorption efficiency of the adsorbent according to the sampling results, and judge the degree of desorption reaction of the solid amine material at this position. Moreover, the structural design of the vacuum desorption device 4 can be continuously improved according to the sampling data, and a reliable basis can be provided for the process operation and device design of the adsorbent desorption. In practical applications, a more accurate basis can be provided for the length, rotation speed, heating temperature design, etc. of the vacuum desorption device 4 according to the sampling data. For example, when the material is desorbed while being conveyed in the vacuum spiral desorption device, an online sampling point is set at the front, middle and rear ends of the material travel direction. Under certain conditions of rotation speed, shaft length and heating temperature, if the desorption efficiency of the middle-section sampling material is less than 50% and the desorption efficiency of the rear-section sampling material is less than 80%, it means that the rotation speed is too fast and the heating temperature is too low; if the temperature and rotation speed have reached the upper limit, it means that the shaft length is too small and the processing capacity of the device is insufficient; conversely, if the desorption efficiency is still very high at a lower temperature and high rotation speed, the shaft length can be reduced, thereby reducing the cost of the device.

[0036] In addition, the cooling unit 1 may be equipped with a sampling pipeline for conveying materials, a pressure gauge 14 for detecting the vacuum degree in the cooling container 11, a temperature detection device 13 for detecting the temperature, and a series of electric valves that communicate with the control unit 3, as shown in the attached figure. Figure 1 and attached Figure 2 shown.

[0037] In some specific embodiments, the cooling part 1 is further provided with a dust collecting part 12 connected to the cooling container 11; the cooling container 11 is provided with an air blowing port, which is used to pass gas into the cooling container 11 after the material is transferred to the material storage part 2, so as to blow the remaining material into the dust collecting part 12, and collect the adsorbent remaining in the cooling container 11 through the dust collecting part 12. After cooling, the adsorbent will be transferred to the material storage part 2, and some materials will inevitably remain in the cooling container 11. The remaining materials may adhere to the inner wall of the container and the cooling component, and the accumulation will affect the next sampling. In order not to affect the subsequent use, the residual materials need to be cleaned out.

[0038] Among them, the cooling container 11 is equipped with a cooling component for cooling the material, and is provided with a feed port, an air suction port, a discharge port, and an air blowing port. The air suction port is used to connect to an external vacuum pumping device, the feed port is used to connect to an external vacuum desorption device 4, and the discharge port is connected to the storage part 2; the cooling container 11 is used to contain the adsorbent from the vacuum desorption device 4 after being vacuumed, and transfer the material to the storage part 2 after cooling it to a preset temperature by using the cooling component. The feed port, the air suction port, the discharge port, and the air blowing port can all be connected to the corresponding device through a pipeline. The feed port is connected to the vacuum desorption device 4 through a pipeline, and the adsorbent enters the cooling container 11 through the feed port. The air suction port is connected to the vacuum device through a pipeline, and the vacuum device extracts the air in the cooling container 11 through the air suction port. The discharge port is connected to the storage part 2 through a pipeline, and the cooled adsorbent leaves the cooling container 11 through the discharge port. The air blowing port is connected to the external air blowing device through a pipeline, and the air blowing device blows gas into the cooling container 11 through the air blowing port to achieve cleaning. In some embodiments, the cooling container 11 is further provided with an air vent for introducing air into the cooling container 11 to release the vacuum state.

[0039] When sampling the solid amine in the vacuum desorption device 4, the temperature of the sample needs to be cooled from above 100°C to below 40°C under vacuum with the aid of the cooling unit 1, so that the sample does not come into contact with oxygen at high temperature. The cooling container 11 is the main part of the cooling unit 1, which is provided with a cooling component responsible for performing the cooling function. The cooling component directly determines the cooling method of the cooling container 11, and the cooling method can be a common cooling scheme such as liquid cooling and air cooling. In some embodiments, the cooling component is a cooling tube 15, and the cooling tube 15 is used to circulate the coolant. In the attached Figure 2 In the embodiment, a spirally wound cooling pipe 15 is provided in the cooling container 11, and a coolant flows in the cooling pipe 15. The coolant enters from the lower liquid inlet A6, and after completing the heat exchange in the container, it flows out from the upper liquid outlet A7, and can be recycled. Exemplarily, the cooling container 11 is a cooling tank, and the cooling pipe 15 in the cooling tank can be a coil or a tube array, and cooling brine or tap water is passed to cool the material.

[0040] In this embodiment, a blowing port is provided on the cooling container 11, and air can be blown into the container, and only the valve at the dust collecting part 12 is opened, so that the gas mixed with the residual material enters the dust collecting part 12 to complete the cleaning. The gas entering the blowing port can be selected according to the gas desorbed by the vacuum desorption device 4. For example, the vacuum desorption device 4 is responsible for desorbing carbon dioxide from the solid amine, and pure carbon dioxide gas can be connected to the blowing port for blowing, and the residual solid amine can be cleaned without affecting the purity of the gas desorbed by the adsorbent. The dust collecting part 12 can choose a dust collecting bag or a dust collecting metal filter element with a mesh number between 600-10000 mesh. The dust collecting bag is a filter composed of many fine fibers, which can capture microparticles in the air, filter and remove particulate matter, and recycle materials in the production process. The metal filter element is made of special materials, can work stably in a high temperature environment, realize material recovery and purification and dust removal, and has the characteristics of small size, easy loading and unloading, and good cleaning effect.

[0041] In the attached Figure 1 In the embodiment, the feed port and the air blowing port are located at the upper end of the cooling container 11, the discharge port is located at the lower end of the cooling container 11, and the dust collecting part 12 is connected to the lower end of the cooling container 11. The feed port is located at the upper end, and the discharge port is located at the lower end, so that the material falls into the discharge port after being cooled by the cooling container 11 from the feed port under the action of gravity, which is convenient for cooling. At the same time, the material is also easy to accumulate inside the container, and the gas blown from top to bottom can fully agitate the residual material in the cooling container 11. The dust collecting device is connected to the lower end of the cooling container 11, so that the residual material in the entire container is agitated, so that the material is better collected.

[0042] In some specific embodiments, the cooling unit 1 further includes a temperature detection device 13, which is located in the cooling container 11 and is used to detect the temperature of the material in the cooling container 11. The temperature detection device 13 can be connected to the external control unit 3, and when it is detected that the material is cooled below a preset temperature, it is fed back to the control unit 3, and the control unit 3 controls the cooling device to stop cooling and transports the cooled material to the material storage unit 2. In practical applications, the temperature detection device 13 can be set inside the cooling container 11 and on the cooling component.

[0043] In some specific embodiments, an interlayer space is provided between the outer wall and the inner wall of the cooling container 11 to achieve heat insulation. The cooling container 11 adopts a double-layer structure, which can better insulate. Considering that the online sampling device needs to sample under a high temperature environment, if the heat insulation effect is not good, the external high temperature will affect the cooling inside the device. A double-layer container structure with an interlayer is selected, and the interlayer can be evacuated or filled with heat insulation materials to better insulate.

[0044] In some specific embodiments, the cooling container 11 is provided with an observation window, which is used to observe the internal conditions of the cooling container 11, such as whether there is material attached to the cooling component. The observation window is made of a solid transparent material, and at the same time needs to have certain high temperature resistance and pressure resistance properties, and transparent pressure-resistant tempered glass can be used. The strength of pressure-resistant tempered glass is more than 5 times that of ordinary glass, and it has good bending resistance, pressure resistance and impact resistance, and can withstand high temperature changes.

[0045] In some specific embodiments, the storage section 2 includes a feed pipe 21, a connection end 22, a feed valve 23 and a storage container 24; the feed pipe 21 is connected to the discharge port and the connection end 22, the feed valve 23 is connected to the feed pipe 21, and the storage container 24 is detachably connected to the connection end 22. The control unit 3 is connected to the feed valve 23 for communication and can control the switch of the feed valve 23. The storage section 2 is responsible for storing the cooled material. The material collected by the online sampling device needs to be subsequently processed to obtain the relevant desorption data. In order to facilitate the acquisition of the material in the storage section 2, the connection end 22 is used as a detachable connection structure to realize the convenient disassembly and assembly of the storage container 24. The feed valve 23 is located in the connection end 22, and the connection end 22 is connected to the feed pipe 21 and the storage container 24. Controlling the feed valve 23 can control the material to enter the storage container 24. In the attached Figure 2 In the embodiment, the material storage container 24 is connected to the feed pipe 21 through the connection end 22, which is convenient for disassembly. For example, the connection end 22 and the material storage container 24 can be connected by bolts or threads, or other detachable connection methods can be selected.

[0046] In some specific embodiments, a ball valve is provided at the feed port A1, and / or the discharge port A2, and / or the air extraction port A3, and / or the air release port A4, and / or the air blowing port A5, and the ball valve is communicatively connected to the control unit 3, as shown in the attached Figure 2As shown. The control unit 3 controls the switch of the ball valve and thus controls the whole process of sampling. For example, taking the desorption of carbon dioxide by solid amine as an example, the whole process of operation of the online sampling device is described. After the adsorbent has adsorbed carbon dioxide, the adsorbent is placed in the vacuum desorption device 4 for vacuum desorption. When the desorption reaction is carried out to a certain time or degree and sampling and analysis are required, sampling can be performed through the online sampling device below. When sampling, the cooling tank is first evacuated through the vacuum valve at the air pumping port A3. After the vacuuming is completed, the first electric ball valve at the feed port A1 is opened to pump the material from the vacuum desorption device to the cooling container 11. Cooling brine or tap water or other coolant is introduced from the liquid inlet A6 to cool the material, and the coolant flows out from the liquid outlet A7. After the control unit 3 detects that the temperature is lower than 40°C through the temperature detection device 13, the venting ball valve at the venting port A4 can be opened to allow air to be introduced to release the vacuum state, and the discharge electric ball valve at the discharge port A2 can be opened to discharge the material into the storage container 242. After the discharge is completed, gas purge is performed, the ball valve at the blowing port A4 is opened, and pure carbon dioxide gas with a pressure of 0.1-0.7 MPa is introduced to purge the fine powder of the material into the dust collecting part 12, completing a complete sampling. The next sampling can be performed according to the control of the control unit 3.

[0047] In some specific embodiments, the adsorbent may be a solid amine or liquid amine with good fluidity, the desorption temperature may be 70-160° C., the temperature of the taken-out adsorbent may be 60-140° C., and the temperature of the adsorbent after cooling may be 20-50° C. In practical applications, different sampling volumes may be controlled by an electric ball valve, and a specific sampling time may be set by the control unit 3 for sampling.

[0048] This embodiment provides an online sampling device, which uses a vacuum sampling design with a cooling function to perform vacuum sampling on materials in a high-temperature and high-vacuum environment without damaging the materials or affecting the operation of the vacuum desorption device. The device has high sampling accuracy and a wide range of applications.

[0049] Example 2

[0050] This embodiment provides a vacuum desorption system, which applies the online sampling device of Embodiment 1 to a specific scenario. The module schematic diagram of the vacuum desorption system is shown in the attached figure. Figure 3 The specific plan is as follows:

[0051] A vacuum desorption system comprises a vacuum desorption device 4, a vacuum pumping device 5 and one or more online sampling devices in Embodiment 1, wherein the sampling unit in the online sampling device is located in the vacuum desorption device 4, and the vacuum pumping device 5 is connected to the vacuum desorption device 4. In addition, the vacuum pumping device 5 is also connected to the air extraction ports in part or all of the online sampling devices. The vacuum desorption device 4 and the online sampling device share the vacuum pumping device 5, which can reduce the volume of the online sampling device and reduce the sampling cost.

[0052] In some specific embodiments, a plurality of rotating blades 41 for stirring are provided in the vacuum desorption device 4, and the sampling unit of the online sampling device is located between the rotating blades 41. In order to achieve sufficient desorption, a stirring device is usually provided in the vacuum desorption device. When a plurality of rotating blades 41 are provided in the vacuum desorption device, the online sampling device is located between the rotating blades 41 to obtain a sample of the material there. At the same time, the sampling port is arched slightly higher than the bottom surface of the inner wall of the vacuum desorption device 4 to prevent the material from sticking to the wall from being taken.

[0053] The utility model provides an online sampling device and a vacuum desorption system having the same. The online sampling device uses a vacuum sampling design with a cooling function to perform vacuum sampling of materials in a high-temperature and high-vacuum environment without damaging the materials and affecting the operation of the vacuum desorption device. The vacuum desorption system has a built-in online sampling device, which can monitor data such as the desorption efficiency and stability of the materials in the vacuum desorption process in real time, providing data support for large-scale industrial applications.

[0054] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0055] The above disclosure only discloses several specific implementation scenarios of the present invention. However, the present invention is not limited thereto, and any changes that can be conceived by technicians in this field should fall within the protection scope of the present invention.

Claims

1. An online sampling device, characterized in that: Used to sample a carbon capture vacuum desorption device, comprising a sampling unit and a control unit, wherein the control unit is communicatively connected to the sampling unit; The sampling unit comprises a cooling part and a material storage part, wherein the cooling part is provided with a cooling container for cooling the material, and the material storage part is used to store the material cooled by the cooling part; The cooling container is provided with a feed port, an air extraction port, and a discharge port, wherein the air extraction port is used to connect to an external vacuum extraction device, the feed port is used to connect to an external vacuum desorption device, and the discharge port is connected to the material storage part; The control unit is used to allow the adsorbent in the vacuum desorption device to enter the cooling container after the cooling container is evacuated, and to allow the material in the cooling container to enter the material storage portion after the material is cooled to a preset temperature.

2. The online sampling device according to claim 1, characterized in that: The cooling unit is also provided with a dust collecting unit connected to the cooling container; The cooling container is provided with an air blowing port, and the air blowing port is used to introduce gas into the cooling container after the material is transferred to the material storage part, so as to blow the remaining material into the dust collecting part.

3. The online sampling device according to claim 2, characterized in that: The feed port, and / or the air extraction port, and / or the discharge port, and / or the air blowing port are provided with electric valves which are communicatively connected to the control unit.

4. The online sampling device according to claim 1, characterized in that: An interlayer space is provided between the outer wall and the inner wall of the cooling container to achieve heat insulation treatment.

5. The online sampling device according to claim 1, characterized in that: The cooling container is provided with an observation window, and the observation window is used to observe the internal situation of the cooling container.

6. The online sampling device according to claim 1, characterized in that: The material storage part comprises a feed pipe, a connection end, a feed valve and a storage container, and the control unit is communicatively connected to the feed valve; The feed pipe is connected to the discharge port and the connection end respectively, the feed valve is connected to the feed pipe, and the storage container is detachably connected to the connection end.

7. The online sampling device according to claim 1, characterized in that: A cooling pipe for containing cooling liquid is arranged in the cooling container.

8. The online sampling device according to claim 1, characterized in that: The cooling unit further comprises a temperature detection device which is communicatively connected to the control unit, and the temperature detection device is located in the cooling container and is used to detect the temperature of the material in the cooling container.

9. A vacuum desorption system, characterized in that: A vacuum desorption device, a vacuum pumping device and one or more online sampling devices as described in any one of claims 1 to 8, wherein the sampling unit in the online sampling device is located in the vacuum desorption device, and the vacuum pumping device is connected to the vacuum desorption device and the air extraction ports in part or all of the online sampling device.

10. The vacuum desorption system according to claim 9, characterized in that: The vacuum desorption device is provided with a plurality of rotating blades for stirring, and the sampling unit of the online sampling device is located between the rotating blades.

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