Supporting device for thermogravimetric analyzer, and thermogravimetric analyzer

Abstract

A supporting device for a thermogravimetric analyzer, and the thermogravimetric analyzer. The supporting device comprises: a draft shield arranged around the outer side of the thermogravimetric analyzer; and an exhaust gas buffering device, which comprises an exhaust gas intake pipe (5), an exhaust gas output pipe (7) and a buffering structure, the buffering structure comprising a buffer bottle (6), wherein a first end of the exhaust gas intake pipe (5) is connected to an exhaust gas pipe of the thermogravimetric analyzer; the buffer bottle is provided with a gas inlet and a gas outlet, and a second end of the exhaust gas intake pipe (5) is connected to the gas inlet of the buffer bottle; the gas outlet of the buffer bottle (6) is connected to the exhaust gas output pipe (7); and an exhaust gas outlet of the exhaust gas output pipe (7) is in communication with the outside environment. Thus, fluctuations in a thermogravimetric curve caused by indoor environmental drafts and outdoor airflow disturbances can be reduced.

Description

A thermal gravimetric analyzer matching device and thermal gravimetric analyzer TECHNICAL FIELD

[0001] The utility model belongs to thermal gravimetric analyzer technical field, especially relate to a thermal gravimetric analyzer matching device and thermal gravimetric analyzer. BACKGROUND

[0002] Thermal gravimetric analyzer (TGA) is the instrument using thermal gravimetric method to detect the weight and temperature / time change relation of matter, mainly by furnace body, balance, sample support and computer composition.TGA's working principle is that sample is heated in furnace body under specific atmosphere, and high-precision balance connected with sample support senses the current weight change of sample at any time, and transmits data to computer, and the weight and temperature / time curve (i.e. thermal gravimetric curve) of sample is obtained by computer processing.Because the temperature remains unchanged when the phase changes (such as losing crystal water, crystallizing solvent, crystal transformation or thermal decomposition etc.), so the thermal gravimetric curve is usually stepped, and the region of weight basically unchanged is called platform.Using the characteristics of platform, it can be distinguished that the water / solvent contained in sample is crystal water / solvent or adsorbed water / solvent, and the molecular proportion of contained crystal water / solvent can be calculated according to the weight loss rate between platforms.

[0003] Thermal gravimetric method is widely used in drying weight loss, crystal water characterization, salt screening and crystal type research, crystallization process development and sample thermal stability investigation etc. in drug research and development and quality control because of its advantages such as small sample amount (about 2-5mg), fast analysis speed (less than 2h) and simple operation.In recent years, multiple varieties (such as vincristine sulfate, amiloride hydrochloride, azithromycin etc.) recorded in USP and EP all use thermal gravimetric method to control their moisture, drying weight loss and other indexes, which shows that the quantitative function of thermal gravimetric analysis has been recognized by foreign authoritative organizations in the application of drug quality research, and the application of this method can effectively solve the limitation of insufficient sample amount in early research and development, provide a rapid evaluation method for process selection, and meet the requirement of accurate standardization of valuable impurity reference substance.

[0004] In the use process of thermal gravimetric analyzer, the following technical problems are found: (1) when thermal gravimetric analyzer is used for detection, the corresponding weight change is easily affected by air flow stability, indoor air conditioning wind and environmental vibration, resulting in large thermal gravimetric curve fluctuation and poor repeatability of determination results; (2) the tail gas exhaust pipe directly leads to outdoor, and the detection process is easily affected by outdoor thunderstorm, wind and vibration, so that the thermal gravimetric curve suddenly appears violent vibration (such as 200-250 DEG C in figure 1) in the determination process, resulting in test failure.

[0005] Utility model content

[0006] In view of the above problems existing in the prior art, the purpose of the utility model embodiment is to provide a supporting device of a thermogravimetric analyzer and the thermogravimetric analyzer, which can reduce the fluctuation in the thermogravimetric curve caused by indoor environment wind and outdoor airflow disturbance.

[0007] The technical scheme adopted by the utility model embodiment is:

[0008] A supporting device of a thermogravimetric analyzer, the supporting device comprising a wind shield and a tail gas buffer device. The wind shield is arranged on the outside of the thermogravimetric analyzer. The tail gas buffer device comprises a tail gas inlet pipe, a tail gas outlet pipe and a buffer structure, the buffer structure comprising a buffer bottle, the first end of the tail gas inlet pipe being connected to the tail gas pipe of the thermogravimetric analyzer, the buffer bottle being provided with an air inlet and an air outlet, the second end of the tail gas inlet pipe being connected to the air inlet of the buffer bottle, the air outlet of the buffer bottle being connected to the tail gas outlet pipe, and the tail gas outlet of the tail gas outlet pipe being connected to the outside.

[0009] In some embodiments, a first tail gas channel is formed between the buffer structure and the air inlet of the tail gas pipe of the thermogravimetric analyzer, and a second tail gas channel is formed between the buffer structure and the tail gas outlet; along the flow direction of the tail gas, the distance for tail gas flow in the first tail gas channel is greater than the distance for tail gas flow in the second tail gas channel.

[0010] In some embodiments, the supporting device further comprises a tail gas purification device, the tail gas purification device being arranged between the thermogravimetric analyzer and the buffer structure, the tail gas inlet of the tail gas purification device being connected to the tail gas pipe of the thermogravimetric analyzer, and the tail gas outlet of the tail gas purification device being connected to the air inlet of the buffer bottle.

[0011] In some embodiments, the tail gas purification device comprises a pre-adsorption pipe, a hydrocarbon trapping trap and an adsorption saturation indicating pipe connected in series, the tail gas inlet of the pre-adsorption pipe being connected to the tail gas pipe of the thermogravimetric analyzer, and the tail gas outlet of the adsorption saturation indicating pipe being connected to the air inlet of the buffer bottle of the buffer structure.

[0012] In some embodiments, in the case where the buffer structure comprises at least two buffer bottles, the buffer structure comprises a fixing rod, the fixing rod being connected to the two adjacent buffer bottles to fix the buffer bottles.

[0013] In some embodiments, the buffer structure further comprises a buffer bottle protection box, and the buffer bottle is arranged in the buffer bottle protection box.

[0014] In some embodiments, the wind shield comprises a door body and a main body, the main body is provided with an operation opening, the door body is arranged at the position of the operation opening, and the door body can move relative to the main body to close or open the operation opening.

[0015] In some embodiments, the number of buffer bottles is 1 to 7.

[0016] In some embodiments, the air inlet of the buffer bottle is arranged at the top of the buffer bottle, and the air outlet of the buffer bottle is arranged at the bottom of the buffer bottle.

[0017] A thermal gravimetric analyzer, the thermal gravimetric analyzer comprises the matching device of the thermal gravimetric analyzer of any one of the embodiments.

[0018] Compared with the prior art, the beneficial effects of the embodiments of the utility model lie in that the wind shield is arranged on the outside of the thermal gravimetric analyzer, and the tail gas buffer device is only connected with the tail gas pipe of the thermal gravimetric analyzer, so that the influence of the indoor environmental wind on the sample thermal gravimetric detection process can be reduced; the tail gas buffer device can balance the indoor and outdoor air pressure in the case of strong convection outdoors through the buffer bottle, so that the air flow stability of the thermal gravimetric analyzer can be effectively improved, so that the thermal gravimetric curve obtained after the thermal gravimetric analyzer is detected is more gentle, and fluctuation basically does not occur, and the result reproducibility of the thermal gravimetric curve is improved.

[0019] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory in nature and not intended to limit the present utility model.

[0020] The foregoing summary of various implementations or examples of the technology described in this utility model is not a comprehensive disclosure of the entire scope or all of the features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0021] In the drawings, which are not necessarily drawn to scale, like numerals can describe similar components in different views. Like numerals having different letter suffixes can represent different instances of similar components. The drawings illustrate generally, by way of example, various embodiments of the present utility model and are not intended to limit the present utility model in any way. The same or similar reference numerals in all figures can represent similar parts. Such embodiments are illustrative, and not intended to be exhaustive or limiting of the present utility model or approach.

[0022] Fig. 1 is a schematic diagram of a thermal gravimetric curve appearing severe jitter.

[0023] Fig. 2 is a schematic diagram of the structure of the wind shield of the embodiments of the utility model.

[0024] Fig. 3 is a schematic diagram of the buffer structure of the embodiments of the utility model.

[0025] Fig. 4 is a schematic diagram of the influence of the tail gas buffer device of the embodiments 1 of the utility model on the thermal gravimetric curve.

[0026] Fig. 5 is a schematic diagram of the structure of the tail gas purification device of the embodiments of the utility model.

[0027] Fig. 6 is a schematic diagram of the tail gas purification effect of the embodiments 2 of the utility model.

[0028] Reference signs:

[0029] 1 - lock; 2 - door handle; 3 - hydraulic rod; 4 - pre-bore; 5 - tail gas inlet pipe; 6 - buffer bottle; 7 - tail gas outlet pipe; 8 - pre-adsorption pipe; 9 - reducing sleeve; 10 - hydrocarbon trap; 11 - adsorption saturation indicating pipe; 12 - fixing rod; 13 - buffer bottle protection box. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of the present application.

[0031] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the usual meaning understood by a person with ordinary skill in the art to which the present application belongs. The terms "first", "second" and similar words used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.

[0032] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits the detailed description of known functions and known components.

[0033] As shown in FIGS. 2 and 3, the embodiments of the present application provide a supporting device of a thermogravimetric analyzer, which includes a wind shield and a tail gas buffer device. The wind shield is arranged on the outside of the thermogravimetric analyzer. The tail gas buffer device includes a buffer bottle 6, a first end of a tail gas inlet pipe 5 is connected with a tail gas pipe of the thermogravimetric analyzer, the buffer bottle 6 is provided with an air inlet and an air outlet, a second end of the tail gas inlet pipe 5 is connected with the air inlet of the buffer bottle 6, the air outlet of the buffer bottle 6 is connected with a tail gas outlet pipe 7, and a tail gas outlet of the tail gas outlet pipe 7 is connected with the outside.

[0034] In some embodiments, in the case that the buffer structure comprises at least two buffer bottles, the second end of the tail gas inlet pipe 5 is connected to the gas inlet of the most upstream buffer bottle 6 of the at least two buffer bottles 6, the gas outlet of the most downstream buffer bottle 6 is connected to the tail gas outlet pipe 7, and the tail gas outlet of the tail gas outlet pipe 7 is connected to the outdoor. In the flow direction of the tail gas, the gas outlet at the bottom of the upstream buffer bottle 6 is connected to the gas inlet at the top of the adjacent downstream buffer bottle 6 through a connecting pipe.

[0035] The wind shield is arranged outside the thermal gravimetric analyzer, so that the thermal gravimetric analyzer is isolated from the airflow such as air conditioning wind in the room, and the fluctuation of the thermal gravimetric curve caused by the disturbance of the indoor airflow is avoided, and the accuracy of the detection result is improved.

[0036] The tail gas generated by the thermal gravimetric analyzer during the detection process is discharged through the tail gas pipe of the thermal gravimetric analyzer. The tail gas inlet pipe 5 of the tail gas buffer device discharges the tail gas in the tail gas pipe of the thermal gravimetric analyzer into the buffer structure, and the tail gas sequentially passes through each buffer bottle 6 in series according to the order of the buffer bottles 6 and is discharged.

[0037] The airflow from the outdoor enters the empty buffer bottle 6 through the tail gas outlet pipe 7 of the tail gas buffer device. The buffer bottle 6 plays a role of airflow buffering, reduces the influence of the outdoor airflow on the thermal gravimetric analyzer in the wind shield, avoids the curve fluctuation in the thermal gravimetric curve caused by the outdoor airflow, improves the stability of the thermal gravimetric curve, increases the accuracy of the detection result, and improves the result reproducibility.

[0038] In some embodiments, the bottom of the wind shield is provided with a preformed hole 4. The preformed hole 4 can be provided with multiple. For passing through the power line, carrier gas, water bath pipe and tail gas pipe, etc. The shape of the preformed hole 4 can be semicircular, circular, triangular or square, etc., preferably semicircular.

[0039] In some embodiments, the material of the wind shield can be plastic, glass, metal, etc., preferably acrylic material.

[0040] In some embodiments, the material of the connecting pipe can be plastic or glass, etc. It is convenient for the series connection of adjacent buffer bottles 6.

[0041] In some embodiments, the buffer structure and the gas inlet of the tail gas pipe of the thermal gravimetric analyzer form a first tail gas passage, and the buffer structure and the tail gas outlet form a second tail gas passage; along the flow direction of the tail gas, the distance of the first tail gas passage for the tail gas flow is greater than the distance of the second tail gas passage for the tail gas flow. The buffer structure is arranged at a position close to the tail gas outlet of the tail gas outlet pipe 7, so that the buffer structure can better play a buffering role and reduce the fluctuations in the thermal gravimetric curve. Further, in the case that the tail gas pipe extends to the pre-prepared hole position of the thermal gravimetric analyzer, the length of the tail gas outlet pipe 7 between the buffer structure and the tail gas outlet is less than the length of the tail gas inlet pipe 5 between the buffer structure and the tail gas pipe of the thermal gravimetric analyzer.

[0042] In some embodiments, the matching device further comprises a tail gas purification device, which is arranged between the tail gas pipe of the thermal gravimetric analyzer and the buffer structure, the tail gas inlet of the tail gas purification device is connected with the tail gas pipe of the thermal gravimetric analyzer, and the tail gas outlet of the tail gas purification device is connected with the gas inlet of the buffer bottle 6 of the buffer structure. The tail gas mainly includes organic solvents and harmful gases generated by heating decomposition, and the tail gas purification device can purify the tail gas, purify the indoor environment, and reduce the exposure risk of the detection personnel. And the tail gas purification device and the tail gas buffer device jointly act, which can improve the buffering effect on outdoor air flow, improve the accuracy of the detection result, and improve the reproducibility of the determination result.

[0043] In the case that the buffer structure comprises at least two buffer bottles, the tail gas outlet of the tail gas purification device is connected with the gas inlet of the most upstream buffer bottle 6 of the buffer structure.

[0044] As shown in FIG. 5, in some embodiments, the tail gas purification device comprises a pre-adsorption pipe 8, a hydrocarbon trapping trap 10 and an adsorption saturation indicating pipe 11 connected in series, the tail gas inlet of the pre-adsorption pipe 8 is connected with the tail gas pipe of the thermal gravimetric analyzer, and the tail gas outlet of the adsorption saturation indicating pipe 11 is connected with the gas inlet of the buffer bottle 6 of the buffer structure. A variable-diameter sleeve 9 can be arranged on the pipeline connecting the tail gas outlet of the pre-adsorption pipe 8 and the tail gas inlet of the hydrocarbon trapping trap 10, and a variable-diameter sleeve 9 can be arranged on the pipeline connecting the tail gas outlet of the adsorption saturation indicating pipe 11.

[0045] In the case that the buffer structure comprises at least two buffer bottles, the tail gas outlet of the adsorption saturation indicating pipe 11 is connected with the gas inlet of the most upstream buffer bottle 6 of the buffer structure.

[0046] Further, the inside of the pre-adsorption pipe 8 is filled with activated carbon solid substances for pre-adsorbing gas substances released in the detection process of the thermal gravimetric analyzer.

[0047] Further, the inside of the hydrocarbon trapping trap 10 is filled with activated carbon for further effectively adsorbing harmful gases such as alkanes, ketones, alcohols, esters, benzene, etc.

[0048] Further, the inside of the adsorption saturation indicating tube 11 is filled with adsorbents such as copper oxide, manganese dioxide, calcium oxide, and organophilic clay, to indicate whether the active pre-adsorption tube 8 and the hydrocarbon trap 10 need to be replaced with new fillings, to ensure the use efficiency.

[0049] The pre-adsorption tube 8, the hydrocarbon trap 10, and the adsorption saturation indicating tube 11 of the tail gas purification device cooperate to better purify the tail gas generated by the thermal gravimetric analyzer during the detection process.

[0050] As shown in FIG. 3, in some embodiments, when the buffer structure includes at least two buffer bottles, the buffer structure further includes a fixing rod 12 connected with the adjacent two buffer bottles 6 to fix the buffer bottles 6. The fixing rod 12 can play a role in fixing the buffer bottles 6, and improve the stability of the buffer bottles 6 under the action of outdoor airflow.

[0051] In some embodiments, the buffer bottles 6 are made of plastic, glass, or metal, and preferably made of glass.

[0052] In some embodiments, the buffer bottles 6 are cylindrical. The bottom inner diameter of the cylindrical buffer bottles 6 is 50-100 mm, and preferably 80 mm; and the height is 100-200 mm, and preferably 150 mm. The buffer bottles 6 can better play a buffering role.

[0053] As shown in FIG. 3, in some embodiments, the buffer structure further includes a buffer bottle protection box 13, and the buffer bottles 6 are arranged in the buffer bottle protection box 13. The buffer bottle protection box 13 provides a space for accommodating the buffer bottles 6.

[0054] As shown in FIG. 2, in some embodiments, the wind shield includes a door body and a main body part, and the main body part is provided with an operation port, and the door body is arranged at the position of the operation port and can move relative to the main body part to close or open the operation port. The operator can operate the thermal gravimetric analyzer through the operation port, and can also close the operation port through the door body to avoid the influence of indoor airflow on the thermal gravimetric analyzer. The door body can be a single-door or a double-door. The operation port of the main body part is arranged at the top, side, or corner position of the main body part.

[0055] The door body and the main body part are connected through a hydraulic rod 3, and the door body is moved relative to the main body part through the hydraulic rod 3. A door handle 2 can be arranged on the door body, and the door body can be further provided with a lock catch 1, so that the combination of the door body and the main body part is more stable.

[0056] In some embodiments, the number of the buffer bottles 6 is 1-7. Preferably, there are 5 buffer bottles 6. By selecting an appropriate number of buffer bottles 6 in series, the airflow buffering effect of the buffer bottles 6 can reduce the fluctuation of the thermal gravimetric curve.

[0057] In some embodiments, the air inlet of the buffer bottle 6 is arranged at the top of the buffer bottle 6, and the air outlet of the buffer bottle 6 is arranged at the bottom of the buffer bottle 6. The buffer bottle 6 is in a cylindrical shape, and the top and the bottom of the buffer bottle 6 are respectively provided with air ports, so that the buffering effect of the buffer bottle 6 is improved.

[0058] The utility model embodiment further provides a thermal gravimetric analyzer, the thermal gravimetric analyzer includes the matching device of thermal gravimetric analyzer of any embodiment of the application. Through the matching device, the result stability and accuracy of the thermal gravimetric analyzer are improved.

[0059] Embodiment 1

[0060] The embodiment provides a thermal gravimetric analyzer tail gas buffer device to improve airflow stability. The structure of the matching device of the thermal gravimetric analyzer: a wind shield is arranged on the thermal gravimetric analyzer, a tail gas buffer device is connected to a tail gas pipe of the thermal gravimetric analyzer, and there is no tail gas purification device.

[0061] Test conditions: the initial temperature is 30 DEG C, the temperature is raised to 800 DEG C at a temperature raising rate of 20 DEG C / min, the temperature is kept at 800 DEG C for 20 min, air is used as a sweeping gas (60 mL / min), and nitrogen is used as a protective gas (20 mL / min).

[0062] Test method: take a thermal gravimetric test empty crucible, and determine the thermal gravimetric curve under the above test conditions, and take opening and closing the laboratory door as a disturbance factor during the test.

[0063] Test results: Fig. 4 shows the thermal gravimetric curve of the empty crucible under the same temperature raising condition, and the vertical coordinate TG represents mass loss. As shown in Fig. 4, when the laboratory door is opened and closed, the thermal gravimetric curve of the thermal gravimetric analyzer without the tail gas buffer device fluctuates at two points, the fluctuation mass of the first fluctuation point is 0.0495 mg (mass change in the figure), and the fluctuation mass of the second fluctuation point is 0.0619 mg. The sample amount used in the thermal gravimetric routine test is about 2-5 mg, so the opening and closing of the door may have an influence of 1%-3% on the test result of the sample. It is found through synchronous test that the use of the tail gas buffer device can effectively avoid the influence of the opening and closing of the door on the thermal gravimetric curve.

[0064] Embodiment 2

[0065] The embodiment provides a thermal gravimetric analyzer tail gas purification device to improve the purification efficiency. The structure of the matching device of the thermal gravimetric analyzer: a wind shield is arranged on the thermal gravimetric analyzer, a tail gas purification device is connected to a tail gas pipe of the thermal gravimetric analyzer, and the tail gas purification device is connected to the tail gas buffer device.

[0066] Thermal gravimetric analysis test conditions: the initial temperature is 30 DEG C, the temperature is raised to 400 DEG C at a temperature raising rate of 20 K / min, and nitrogen is used as a sweeping gas and a protective gas (20 mL / min).

[0067] Headspace GCMS (gas chromatography) conditions: Capillary column with 6% cyanopropylphenyl-94% dimethylpolysiloxane (or similar polar phase) as stationary liquid; column temperature: 40°C for 5 minutes, then ramped at 30°C per minute to 250°C for 5 minutes; injection port temperature: 240°C; constant flow rate: 2 mL / min; split ratio: 10:1; FID temperature: 260°C; MSD ion source temperature: 230°C; headspace vial equilibration temperature: 220°C; equilibration time: 20 minutes; quantification ring temperature: 230°C; transfer line temperature: 240°C; injection volume: 1000 μL.

[0068] Experimental procedure

[0069] Step 1: Take three different types of compounds to perform thermogravimetric detection under the above test conditions.

[0070] Step 2: Use aged Tenax-TA (2,6-diphenylfuran porous polymer resin) adsorbent to fill a glass tube with open ends, and insert it into the tail gas purification device to adsorb organic impurities in the tail gas.

[0071] Step 3: After the sample determination is completed, remove the glass tube containing the Tenax-TA adsorbent, and pour the Tenax-TA adsorbent in the glass tube into a headspace vial and seal it.

[0072] Step 4: Without using the tail gas purification device, repeat steps 1, 2, and 3 to obtain two headspace vials containing Tenax-TA adsorbent, and use headspace gas chromatography to determine them respectively, and record the FID and MS diagrams. The comparison of using the tail gas purification device and not using the tail gas purification device is shown in Figure 6.

[0073] Step 5: Use the NIST library configured by MS to qualitatively analyze the detected chromatographic peaks, and obtain the results shown in Figure 6. The vertical axis of Figure 6 represents the peak height, and Figure 6 can be used to determine which harmful substances exist in the tail gas. In Figure 6, the curve corresponding to the TG tail gas detection result before using the tail gas purification device represents the detection result under the condition that the supporting device of the thermogravimetric analyzer includes a wind shield and a tail gas buffer device, but does not include a tail gas purification device. In Figure 6, chromatographic peak 1 represents trimethylamine, chromatographic peak 2 represents ethanol, chromatographic peak 3 represents 3-methylfuran, chromatographic peak 4 represents 2,3-butanedione, chromatographic peak 5 represents 2-butanone, chromatographic peak 6 represents ethyl acetate, chromatographic peak 7 represents tetrahydrofuran, chromatographic peak 8 represents benzene, chromatographic peak 9 represents n-heptane, chromatographic peak 10 represents ethylbenzene, chromatographic peak 11 represents o-xylene, chromatographic peak 12 represents p-xylene, chromatographic peak 13 represents trimethyl phosphate, chromatographic peak 14 represents phenol, and chromatographic peak 15 represents benzoic acid.

[0074] The TG tail gas detection result curve after using the tail gas purification device in Figure 6 represents the detection result in the case that the supporting device of the thermal gravimetric analyzer includes a wind shield, a tail gas buffer device and a tail gas purification device. Through the curve, it can be obtained that the toxic and harmful substances in the tail gas are basically adsorbed after the tail gas purification device is applied. Therefore, the tail gas purification device can effectively protect the environment and reduce the exposure risk of the detection personnel.

[0075] Step 6: The tail gas purification efficiency can be calculated by peak area ratio of detected impurities.

[0076] The above description is intended to be illustrative and not restrictive, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more solutions thereof) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A kit for a thermogravimetric analyzer, characterized in that, The complete set of devices comprises: A wind shield is arranged outside the thermal gravimetric analyzer; The tail gas buffer device comprises a tail gas inlet pipe, a tail gas outlet pipe and a buffer structure, the buffer structure comprises a buffer bottle, the first end of the tail gas inlet pipe is connected with the tail gas pipe of the thermal gravimetric analyzer, the buffer bottle is provided with an inlet and an outlet, the second end of the tail gas inlet pipe is connected with the inlet of the buffer bottle, the outlet of the buffer bottle is connected with the tail gas outlet pipe, and the tail gas outlet of the tail gas outlet pipe is connected with the outside.

2. The matched set of thermogravimetric analyzers of claim 1, wherein, The buffer structure and the inlet of the tail gas pipe of the thermal gravimetric analyzer form a first tail gas channel, and the buffer structure and the tail gas outlet form a second tail gas channel; along the flow direction of the tail gas, the distance of the first tail gas channel for tail gas flow is greater than that of the second tail gas channel.

3. The complementary device for a thermogravimetric analyzer of claim 1, wherein, The complete set of devices further comprises a tail gas purification device, which is arranged between the thermal gravimetric analyzer and the buffer structure, the tail gas inlet of the tail gas purification device is connected with the tail gas pipe of the thermal gravimetric analyzer, and the tail gas outlet of the tail gas purification device is connected with the inlet of the buffer bottle of the buffer structure.

4. The complementary device for a thermogravimetric analyzer of claim 3, wherein, The tail gas purification device comprises a pre-adsorption pipe, a hydrocarbon trapping trap and an adsorption saturation indicating pipe connected in sequence, the tail gas inlet of the pre-adsorption pipe is connected with the tail gas pipe of the thermal gravimetric analyzer, and the tail gas outlet of the adsorption saturation indicating pipe is connected with the inlet of the buffer bottle of the buffer structure.

5. The complementary device for a thermogravimetric analyzer of claim 1, wherein, In the case that the buffer structure comprises at least two buffer bottles, the buffer structure further comprises a fixing rod connected with two adjacent buffer bottles to fix the buffer bottles.

6. The complementary device for a thermogravimetric analyzer of claim 1, wherein, The buffer structure further comprises a buffer bottle protection box, and the buffer bottle is arranged in the buffer bottle protection box.

7. The complementary device for a thermogravimetric analyzer of claim 1, wherein, The wind shield comprises a door body and a main body, the main body is provided with an operation port, the door body is arranged at the position of the operation port, and the door body can move relative to the main body to close or open the operation port.

8. The complementary device for a thermogravimetric analyzer of claim 1, wherein, The number of the buffer bottles is 1-7.

9. The complementary device for a thermogravimetric analyzer of claim 1, wherein, The inlet of the buffer bottle is arranged at the top of the buffer bottle, and the outlet of the buffer bottle is arranged at the bottom of the buffer bottle.

10. A thermogravimetric analyzer characterized by, The thermal gravimetric analyzer comprises the complete set of devices according to any one of claims 1-9.

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