A sample injection method and system suitable for a smog chamber reactor

Abstract

The present disclosure provides a sample injection method suitable for a smog chamber reactor, comprising: in the case that the sample to be injected is a gas, calculating a target pressure of the gas sample to be injected in a cylinder; injecting the first gas sample into the cylinder in a vacuum state, and stopping injecting the first gas sample into the cylinder when the pressure in the cylinder reaches the target pressure; injecting the first gas sample in the cylinder into the smog chamber reactor, so that the first gas sample in the smog chamber reactor reaches a first predetermined reaction reference concentration value. In the case that the sample to be injected is a liquid, calculating a target volume of the liquid sample to be injected in a liquid jacket; injecting the target volume of the liquid sample into the liquid jacket through a liquid inlet, so that the target volume of the liquid sample generates a second gas sample after vaporization in the liquid jacket; injecting the second gas sample into the smog chamber reactor, so that the second gas sample in the smog chamber reactor reaches a second predetermined reaction reference concentration value.

Description

Technical Field

[0001] This disclosure relates to the field of atmospheric chemical reaction experimental technology, specifically to a method and system for introducing gas and liquid samples into a smoke chamber reactor. Background Technology

[0002] A smog chamber reactor is a container made of inert material used to simulate the atmosphere. By introducing the gas to be studied into the smog chamber reactor and observing the changes in reactants and products over time, the dynamic laws of chemical transformation in the atmosphere can be derived. It can eliminate complex meteorological and topographical factors, allowing for the exploration of atmospheric chemical reaction mechanisms under controlled conditions, providing strong theoretical support for the scientific prevention and control of air pollution. As the most important experimental platform in the field of atmospheric science, controlling and altering the concentration of a specific chemical substance entering the smog chamber reactor is fundamental to conducting smog chamber simulated reaction experiments.

[0003] In related technologies, direct injection is commonly used to introduce samples into the fume chamber reactor. However, direct injection easily contaminates the reactor. Furthermore, when using flow meters for sample introduction, repeated calibration is required, leading to issues with flow meter contamination and corrosion. Therefore, under laboratory conditions, accurately controlling the vaporization of quantitative gaseous samples (such as NO and NO2) and liquid samples (such as ethanol and acetone) into the fume chamber reactor, and constructing a more complete sample introduction system, are urgent problems to be solved in the design and application of fume chamber reactors. Summary of the Invention

[0004] In view of this, in order to solve the problem that the smoke chamber reactor cannot simultaneously meet the requirements for gas and liquid sample injection, and to overcome the technical problem that the flow meter is easily corroded and requires repeated calibration when using flow meter injection under normal circumstances, this disclosure proposes a sample injection method and injection system for the smoke chamber reactor.

[0005] One aspect of this disclosure provides a sample introduction method suitable for a smoke chamber reactor, comprising:

[0006] When the sample to be introduced is a gas, the target pressure of the gas sample in the cylinder is calculated based on the first predetermined reaction reference concentration value, the volume of the smoke chamber reactor, the basic pressure of the cylinder under vacuum, and the volume of the cylinder.

[0007] A first gas sample is introduced into a cylinder that is under vacuum.

[0008] Once the pressure inside the cylinder reaches the target pressure, stop introducing the first gas sample into the cylinder.

[0009] The first gas sample in the cylinder is introduced into the smoke chamber reactor so that the first gas sample in the smoke chamber reactor reaches the first predetermined reaction reference concentration value.

[0010] According to an embodiment of this disclosure, when the sample to be introduced is a liquid, the target volume of the liquid sample to be introduced in the liquid sleeve is calculated based on the second predetermined reaction reference concentration value, the volume of the smoke chamber reactor, and the amount and density of the liquid sample in the liquid sleeve.

[0011] A target volume of liquid sample is injected into the liquid sleeve through the inlet so that the target volume of liquid sample vaporizes in the liquid sleeve to generate a second gas sample.

[0012] The second gas sample is introduced into the smoke chamber reactor so that the second gas sample in the smoke chamber reactor reaches the second predetermined reaction reference concentration value.

[0013] According to embodiments of this disclosure, the sample introduction method of the smoke chamber reactor further includes:

[0014] During the vaporization process of a liquid sample of the target volume, if the volatility of the liquid sample is less than a preset volatility threshold, the liquid sample of the target volume is heated by an external heating system.

[0015] Another aspect of this disclosure proposes a smoke chamber reactor injection system for implementing the above-described injection method, comprising:

[0016] The first gas pipeline is used to introduce the first gas sample;

[0017] The cylinder has its inlet end connected to the outlet end of the first gas injection line;

[0018] The second gas pipeline has its inlet end connected to the outlet end of the cylinder.

[0019] The smoke chamber reactor has its inlet end connected to the outlet end of the second gas pipeline.

[0020] According to an embodiment of this disclosure, the sample introduction system of the smoke chamber reactor further includes:

[0021] A vacuum pump, the outlet of which is connected to the inlet of the first gas pipeline;

[0022] A gas cylinder, connected to the first gas pipeline, is used to store the first gas sample;

[0023] The pressure gauge is connected to the first gas line and is used to detect the pressure inside the cylinder.

[0024] According to embodiments of this disclosure, the volume of the cylinder ranges from 1 to 5 L; the pressure gauge includes three pressure gauges with different ranges, namely 0 to 10 Torr, 0 to 100 Torr and 0 to 1000 Torr.

[0025] According to an embodiment of this disclosure, the sample introduction system of the smoke chamber reactor further includes:

[0026] A liquid sleeve is used to allow a liquid sample to vaporize and generate a second gas sample within the liquid sleeve.

[0027] The gas tubing and the liquid tubing are sealed and connected by a hollow bottle cap and a Teflon gasket;

[0028] The third gas pipeline has its inlet end connected to the outlet end of the gas sleeve, and its outlet end connected to the inlet end of the smoke chamber reactor.

[0029] According to an embodiment of this disclosure, the aforementioned gas path sleeve further includes:

[0030] The first airflow channel is connected to the air inlet of the liquid sleeve and is used for gas to enter the liquid sleeve.

[0031] The second airflow channel is connected to the outlet of the liquid sleeve and is used for gas to escape from the liquid sleeve.

[0032] According to an embodiment of this disclosure, the sample introduction system of the smoke chamber reactor further includes:

[0033] An external heating device, detachably mechanically connected to the liquid sleeve, is used to heat the liquid sleeve so that the liquid sample vaporizes to generate a second gas sample.

[0034] According to an embodiment of this disclosure, the sample introduction system of the smoke chamber reactor further includes:

[0035] Zero air input terminal, used to introduce zero air;

[0036] The fourth gas pipeline has its inlet end connected to the outlet end of the zero air input end, and its outlet end connected to the inlet end of the cylinder.

[0037] The fifth gas pipeline has its inlet end connected to the outlet end of the zero air input end, and its outlet end connected to the inlet of the gas sleeve.

[0038] The sampling method and sampling system for a smoke chamber reactor disclosed herein have the following beneficial effects:

[0039] (1) According to the embodiments of this disclosure, a sample introduction system that can simultaneously satisfy both states is constructed based on the properties of gas and liquid samples, effectively integrating gas sample introduction and liquid sample introduction, and solving the problem of easy contamination of the reactor by directly injecting liquid samples into the smoke chamber reactor. At the same time, the construction of the sample introduction system facilitates the calculation of the injection volume of gas or liquid samples through relevant instrument parameters and experimental setting parameters, effectively solving the problem of precise control of sample introduction, and achieving the effect of using the smoke chamber reactor to conduct single-factor variable atmospheric chemical simulation experiments.

[0040] (2) According to the embodiments of this disclosure, the zero-air continuous flushing gas injection system and liquid injection system are controlled to completely introduce gas samples and liquid samples into the smoke chamber reactor, which solves the problem of residual samples in the pipeline under normal circumstances and makes quantitative injection more accurate. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a sample introduction system suitable for implementing the sample introduction method of the smoke chamber reactor in the embodiments of this disclosure;

[0042] Figure 2 This is a schematic diagram of the overall structure of a liquid sample injection device according to an embodiment of the present disclosure;

[0043] Figure 3 This is a schematic diagram of the gas path sleeve in the liquid sample injection device according to an embodiment of the present disclosure;

[0044] Figure 4 This is a schematic diagram of the structure of the liquid sleeve in the liquid sample injection device according to an embodiment of the present disclosure.

[0045] Figure label:

[0046] 1 cylinder;

[0047] 2. Liquid injection device;

[0048] 21. Gas line sleeve;

[0049] 211 air intake;

[0050] 212 air outlet;

[0051] 22 Liquid sleeve;

[0052] 221 Inlet;

[0053] 23 airflow channels;

[0054] 231 First airflow channel;

[0055] 23. Second airflow channel;

[0056] 3. Vacuum pumps;

[0057] 41. First pressure gauge;

[0058] 42. Second pressure gauge;

[0059] 43. Third pressure gauge;

[0060] 5. Steel cylinders containing gaseous samples;

[0061] 61 cylinder output valve;

[0062] 62. Valve at the input end of the first cylinder;

[0063] 63. Valve at the input end of the second cylinder;

[0064] 64. First pressure gauge valve;

[0065] 65 Second pressure gauge valve;

[0066] 66. Third pressure gauge valve;

[0067] 67 Cylinder Valve;

[0068] 68 Vacuum pump valve;

[0069] 69. Valves for liquid injection devices;

[0070] 610 three-way valve;

[0071] 7. Smoke chamber reactor;

[0072] 8. Exhaust gas pipelines;

[0073] 9. Zero air input terminal;

[0074] 101 First gas pipeline;

[0075] 102 Second gas pipeline;

[0076] 103 Third gas pipeline;

[0077] 104 Fourth gas pipeline;

[0078] 105 Fifth gas pipeline. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0080] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0081] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0082] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0083] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0084] It should be noted that, unless otherwise defined, the technical or scientific terms used in this disclosure should have the ordinary meaning understood by a person with ordinary skill in the art to which this disclosure pertains. Where the terms "first," "second," etc., are used throughout, they are used only to distinguish similar objects and should not be construed as indicating or implying their relative importance, order of precedence, or implicitly specifying the number of technical features indicated. It should be understood that the data described by "first," "second," etc., can be interchanged where appropriate.

[0085] In implementing this disclosure, it was discovered that the smoke chamber reactor typically uses a direct sample injection method during the sample introduction process. This often leads to inaccurate sample introduction and contamination of the smoke chamber reactor due to the lack of a fixed sample introduction device. Furthermore, when using a flow meter for sample introduction, the flow meter is easily corroded by the sample carried into it, requiring repeated calibration to control the sample introduction, resulting in additional work.

[0086] To ensure that the smoke chamber reactor can accommodate both gaseous and liquid samples and allows for precise sample control, a suitable sample introduction device is needed. This device should be capable of stably and independently introducing gaseous or liquid samples into the smoke chamber reactor. Simultaneously, the sample volume should be precisely controlled by calculating relevant parameters and predetermined experimental values ​​to address sample residue issues and guarantee accurate sample introduction into the smoke chamber reactor.

[0087] Therefore, this disclosure proposes a sampling method and sampling system suitable for smoke chamber reactors.

[0088] The following illustrative examples illustrate the sample injection method and system of this disclosure. It should be noted that these examples are merely specific embodiments of this disclosure and do not limit the scope of protection of this invention.

[0089] Figure 1 This is a schematic diagram of the structure of a sample introduction system suitable for implementing the sample introduction method of the smoke chamber reactor in the embodiments of this disclosure.

[0090] like Figure 1 As shown, one aspect of this disclosure proposes a sample introduction method suitable for a smoke chamber reactor, including performing the following operations when the sample to be introduced is a gas:

[0091] Operation 11: Based on the first predetermined reaction reference concentration value, the volume of the smoke chamber reactor 7, the basic pressure of cylinder 1 under vacuum, and the volume of cylinder 1, calculate the target pressure of the gas sample to be introduced into cylinder 1.

[0092] Operation 12: Introduce the first gas sample into cylinder 1, which is under vacuum;

[0093] Operation 13: When the pressure inside cylinder 1 reaches the target pressure, stop introducing the first gas sample into cylinder 1;

[0094] Operation 14: Pass the first gas sample in cylinder 1 into the smoke chamber reactor so that the first gas sample in the smoke chamber reactor 7 reaches the first predetermined reaction reference concentration value.

[0095] According to the embodiments of this disclosure, before operation 11, the sample introduction system needs to be cleaned and prepared. The specific method is as follows:

[0096] Close cylinder output valve 61, first cylinder input valve 62, and second cylinder input valve 63. Close first pressure gauge valve 64, second pressure gauge valve 65, and third pressure gauge valve 66. Turn on vacuum pump 3 and vacuum pump valve 68. Open cylinder valve 67 of cylinder 5 containing the first gas sample. Clean the first gas pipeline 101 under the action of vacuum pump 3. Then, close cylinder valve 67, turn on the pressure control device of cylinder 5, and then open the inner valve of cylinder 5 to release part of the first gas sample into the pipeline between the pressure control device and cylinder valve 67. Close the inner valve of cylinder 5, and then open cylinder valve 67 again. Clean the gas pipeline under the action of vacuum pump 3. Repeat the above steps 3 times, and then close cylinder valve 67. Then, close the cylinder output valve 61 and the first cylinder input valve 62, open the second cylinder input valve 63, open the first pressure gauge 41, detect the pressure change in cylinder 1, open the vacuum pump valve 68, use the vacuum pump 3 to evacuate cylinder 1 to a vacuum state, close the vacuum pump valve 68, and record the basic pressure P0 in cylinder 1.

[0097] According to the embodiments of this disclosure, the method for calculating the target pressure of the gas sample to be introduced into the cylinder 1 in operation 11 is as follows:

[0098]

[0099] ;

[0100] Among them, P 气缸 This is the actual pressure of the gas sample in cylinder 1;

[0101] V 气缸 This is the volume of cylinder 1;

[0102] P1 is the target pressure of the gas sample to be introduced into the cylinder 1;

[0103] P0 is the basic pressure inside cylinder 1 under vacuum conditions.

[0104] P 烟雾箱 It is the pressure of the smoke chamber reactor 7;

[0105] V 烟雾箱 This is the volume of the smoke chamber reactor 7;

[0106] n is the first predetermined reference concentration value for the reaction, in ppbv.

[0107] According to an embodiment of this disclosure, the method of introducing the first gas sample in operation 12 includes: first, closing the cylinder valve 67, opening the inner valve of the first gas sample cylinder 5 to release a portion of the first gas sample into the pipeline between the pressure gauge and valve 67, closing the inner valve of cylinder 5, adjusting the cylinder valve 67, and slowly injecting the first gas sample into cylinder 1 so that the first gas sample in cylinder 1 reaches the target pressure P1. Then, closing the second cylinder input valve 63, and simultaneously opening the cylinder output valve 61 and the second cylinder input valve 62, introducing zero air through the zero air input terminal 9. The zero air passes through the fourth gas pipeline 104 and the second cylinder input valve 62 into cylinder 1, and then carries the gas sample through the second gas pipeline 102 and the cylinder output valve 61 into the smoke chamber reactor 7 for atmospheric chemical experiments.

[0108] According to an embodiment of this disclosure, in operation 13, if the pressure of the first gas sample in cylinder 1 is too high, the vacuum pump valve 68 is opened, and the first gas sample in cylinder 1 is extracted under the action of the vacuum pump 3 to achieve the target pressure P1.

[0109] According to embodiments of this disclosure, an integrated gas sample injection method is constructed based on the properties of the first gas sample, solving the problems of easy reactor contamination from directly injecting the first gas sample into the smoke chamber reactor and corrosion from using flow meters. Furthermore, the injection method proposed in this disclosure calculates the target pressure P1 of the gas sample using relevant instrument parameters and experimental settings, effectively solving the problem of precise injection control and achieving the effect of conducting single-factor variable atmospheric chemical simulation experiments using a smoke chamber reactor.

[0110] According to embodiments of this disclosure, such as Figure 1 As shown, when the sample to be introduced is a liquid, the injection method of this embodiment further includes the following operations:

[0111] Operation 21: Based on the second predetermined reaction reference concentration value, the volume of the smoke chamber reactor 7, and the amount and density of the liquid sample in the liquid sleeve 22, calculate the target volume of the liquid sample to be introduced in the liquid sleeve 22.

[0112] Operation 22: Inject a target volume of liquid sample into the liquid sleeve 22 through the liquid inlet 221 so that the target volume of liquid sample will vaporize in the liquid sleeve 22 to generate a second gas sample.

[0113] Operation 23: Pass the second gas sample into the smoke chamber reactor 7 so that the second gas sample in the smoke chamber reactor 7 reaches the second predetermined reaction reference concentration value.

[0114] Figure 2 This is a schematic diagram of the overall structure of a liquid sample injection device according to an embodiment of the present disclosure.

[0115] According to the embodiments of this disclosure, the sample introduction system needs to be cleaned and prepared before operation 21. Specifically, the cleaned gas sleeve 21 and liquid sleeve 22 are connected to the sample introduction system. The liquid sample introduction device valve 69 is opened, and zero air is introduced through the zero air input terminal 9. The three-way valve 610 is adjusted to the direction of the exhaust gas pipe 8. Figure 2 As shown, zero air enters the gas sleeve 21 through the fifth gas line 105, enters the bottom of the tube body along the first airflow channel 231 of the gas sleeve 21, and then escapes through the second airflow channel 232 of the gas sleeve 21, entering the third gas line 103. It then enters the waste gas pipe 8 through the three-way valve 610 to purge the outside air from the liquid sampler 2. This process lasts for more than 5 minutes. The three-way valve 612 is then adjusted to face the smoke chamber reactor 7, allowing zero air to enter the smoke chamber reactor 7 through the liquid sampler 2.

[0116] According to an embodiment of this disclosure, in operation 21, the method for calculating the target volume of the liquid sample to be introduced in the liquid sleeve 22 is as follows:

[0117]

[0118]

[0119] Where M is the mass of the liquid sample in the liquid sleeve 22;

[0120] M W It is the molar mass of the liquid sample in the liquid sleeve 22;

[0121] V 烟雾箱 This is the volume of the smoke chamber reactor 7;

[0122] ρ is the density of the liquid sample in the liquid sleeve 22;

[0123] V l This is the target volume of the liquid sample in the liquid sleeve 22;

[0124] n is the predetermined reference concentration value for the reaction, in molecule cm⁻¹. -3 .

[0125] Figure 4 This is a schematic diagram of the structure of the liquid sleeve in the liquid sample injection device according to an embodiment of the present disclosure.

[0126] According to embodiments of this disclosure, such as Figure 4 As shown, in operation 22, the target volume V is measured using a syringe. lThe liquid sample is injected into the liquid sleeve 22 through the liquid inlet 221. The liquid sample vaporizes in the liquid sleeve 22 to generate a second gas sample. A certain flow rate of zero air carries the second gas sample through the third gas pipeline 103 into the smoke chamber reactor 7 for atmospheric chemical experiments.

[0127] According to the embodiments of this disclosure, the sample injection process generally lasts 2 to 10 minutes. The duration is determined based on the volume and volatility of the liquid sample, and can be specifically observed based on the volume change of the liquid sample in the liquid sleeve 22.

[0128] According to embodiments of this disclosure, during the injection process, the target volume of liquid sample can also be heated by an external heating system, specifically:

[0129] During the vaporization of a liquid sample of the target volume, if the volatility of the liquid sample is less than a predetermined volatility threshold, the liquid sample of the target volume is heated by an external heating system.

[0130] According to an embodiment of this disclosure, in order to ensure that the target volume of liquid sample is completely vaporized to ensure the second predetermined reaction reference concentration value in the smoke chamber reactor 7, it is necessary to use an external heating system to heat the target volume of liquid sample.

[0131] According to the embodiments of this disclosure, after the liquid sample is completely vaporized and enters the smoke chamber reactor, the liquid sample inlet valve 69 is closed, the three-way valve 610 is adjusted to point towards the exhaust gas pipeline, and then the gas sleeve 21 and liquid sleeve 22 are unloaded, cleaned with alcohol and ultrapure water, and placed in an oven for future use.

[0132] According to the embodiments of this disclosure, based on the properties of the liquid sample, a target volume of liquid sample is injected into the liquid sleeve 22, where the liquid sample is vaporized and transformed into a second gas sample before being introduced into the smoke chamber reactor 7. This achieves precise control of the injection volume to reach the concentration required by the smoke chamber reactor, avoiding the problems of pollution caused by directly injecting liquid sample into the smoke chamber reactor 7 and insufficient liquid evaporation.

[0133] Another aspect of this disclosure proposes a smoke chamber reactor injection system for implementing the above-described injection method, such as... Figure 1 As shown, the smoke chamber reactor injection system includes: a first gas pipeline 101, a cylinder 1, a second gas pipeline 102, and a smoke chamber reactor 7.

[0134] The system includes a first gas pipeline 101 for introducing a first gas sample; a cylinder 1, the inlet of which is connected to the outlet of the first gas inlet pipeline 101; a second gas pipeline 102, the inlet of which is connected to the outlet of the cylinder 1; and a smoke chamber reactor 7, the inlet of which is connected to the outlet of the second gas pipeline 102.

[0135] According to the embodiments of this disclosure, the sampling system proposed in this disclosure for a smoke chamber reactor adjusts and controls the amount of the first gas sample fed in through a cylinder 1, and then transports the prepared first gas sample to the smoke chamber reactor 7 through a gas pipeline to achieve the purpose of quantitatively inputting the gas sample.

[0136] According to an embodiment of this disclosure, the sample feeding system of the smoke chamber reactor further includes: a vacuum pump 3, a gas cylinder 5, and a pressure gauge 4.

[0137] Among them, vacuum pump 3, the outlet end of vacuum pump 3 is connected to the inlet end of first gas pipeline 101; gas cylinder 5, connected to first gas pipeline 101, is used to store first gas sample; pressure gauge 4, connected to first gas pipeline 101, is used to detect the pressure inside cylinder 1.

[0138] According to the embodiments of this disclosure, a vacuum pump 3 is used to evacuate the gas pipeline and cylinder 1, and a pressure gauge 4 is used to record the pressure of cylinder 1 under vacuum.

[0139] According to an embodiment of this disclosure, the volume of cylinder 1 ranges from 1 to 5 L; the pressure gauge 4 includes three pressure gauges with different ranges, namely 0 to 10 Torr, 0 to 100 Torr and 0 to 1000 Torr.

[0140] According to embodiments of this disclosure, the sample introduction system proposed in this disclosure for a smoke chamber reactor uses three pressure gauges to meet the requirements for accurate measurement of the target volume of the first gas sample under different experimental conditions.

[0141] According to embodiments of this disclosure, such as Figures 1 to 4 As shown, the sample feeding system of the smoke chamber reactor also includes: liquid sleeve 22, gas sleeve 21, and third gas pipeline 103.

[0142] The liquid sleeve 22 is used for the vaporization of liquid samples to generate a second gas sample; the gas sleeve 21 is sealed and connected to the liquid sleeve through a hollow bottle cap and a Teflon gasket; the third gas pipeline 103 is connected to the gas outlet 212 of the gas sleeve at its inlet end and to the inlet end of the smoke chamber reactor 7 at its outlet end.

[0143] According to embodiments of this disclosure, a sample introduction system suitable for a smoke chamber reactor is proposed to vaporize a liquid sample of a target volume into a liquid sleeve 22 and convert it into a second gas sample, which is then transported to the smoke chamber reactor 7 through a gas sleeve and a gas pipeline to achieve the purpose of quantitatively introducing a gas sample.

[0144] According to an embodiment of this disclosure, the aforementioned gas path sleeve further includes: a first airflow channel 231 and a second airflow channel 232.

[0145] The first airflow channel 231 is connected to the air inlet 211 of the liquid sleeve 22 and is used for gas to enter the liquid sleeve 22; the second airflow channel 232 is connected to the air outlet 212 of the liquid sleeve 22 and is used for gas to escape from the liquid sleeve 22.

[0146] According to an embodiment of this disclosure, the sample introduction system of the smoke chamber reactor further includes an external heating device, which is detachably mechanically connected to the liquid sleeve 22, for heating the liquid sleeve 22 so that the liquid sample vaporizes to generate a second gas sample.

[0147] According to an embodiment of this disclosure, the sample introduction system of the smoke chamber reactor further includes: a zero air input terminal 9, a fourth gas pipeline 104, and a fifth gas pipeline 105.

[0148] Among them, the zero air input terminal 9 is used to introduce zero air; the fourth gas pipeline 104 is connected to the outlet terminal of the zero air input terminal 9 at its inlet and to the inlet terminal of the cylinder 1 at its outlet; the fifth gas pipeline 105 is connected to the outlet terminal of the zero air input terminal 9 at its inlet and to the air inlet 211 of the gas sleeve 21.

[0149] According to the embodiments of this disclosure, zero air is introduced into the gas pipeline through the zero air input terminal 9. On the one hand, this allows the gas sample to be completely introduced into the smoke chamber reactor 7, solving the problem of pipeline residue in related technologies and ensuring the accuracy of sample introduction. On the other hand, it can remove other gases in the pipeline before introducing the gas sample and clean the sample introduction system.

[0150] It should be noted that the described embodiments are merely some, not all, of the embodiments disclosed herein. Other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are all within the scope of protection of this disclosure.

[0151] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of this disclosure. It should be understood that the above are only specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A sample introduction system for a smog chamber reactor, comprising: a first gas line (101) for introducing a first gas sample; a gas cylinder (1) having an inlet end in communication with an outlet end of the first gas line (101); a second gas line (102) having an inlet end in communication with an outlet end of the gas cylinder (1); a smog chamber reactor (7) having an inlet end in communication with an outlet end of the second gas line (102); a vacuum pump (3) having an outlet end in communication with an inlet end of the first gas line (101); a gas cylinder (5) in communication with the first gas line (101) for storing the first gas sample; a pressure gauge (4) in communication with the first gas line (101) for detecting pressure in the gas cylinder (1); a liquid jacket (22) for vaporizing a liquid sample in the liquid jacket (22) to generate a second gas sample; a gas line jacket (21) in sealed communication with the liquid jacket by a hollow cap and a Teflon gasket; a third gas line (103) having an inlet end in communication with a gas outlet (212) of the gas line jacket and an outlet end in communication with the inlet end of the smog chamber reactor (7); the gas line jacket (21) further comprising: a first gas flow channel (231) in communication with a gas inlet (211) of the liquid jacket (22) for gas entering the liquid jacket (22); a second gas flow channel (232) in communication with a gas outlet (212) of the liquid jacket (22) for gas escaping from the liquid jacket (22).

2. The sample introduction system of claim 1, wherein: the gas cylinder (1) has a volume ranging from 1 to 5 L; the pressure gauge (4) comprises three pressure gauges with different ranges, 0-10 Torr, 0-100 Torr and 0-1000 Torr, respectively.

3. The sample introduction system of claim 1, further comprising: an external heating device detachably mechanically connected to the liquid jacket (22) for heating the liquid jacket (22) to vaporize the liquid sample to generate the second gas sample.

4. The sample introduction system of claim 1, further comprising: a zero air input (9) for introducing zero air; a fourth gas line (104) having an inlet end in communication with an outlet end of the zero air input (9) and an outlet end in communication with the inlet end of the gas cylinder (1); a fifth gas line (105) having an inlet end in communication with an outlet end of the zero air input (9) and an outlet end in communication with the gas inlet (211) of the gas line jacket (21).

5. A method for feeding a smokebox reactor, which is suitable for the feeding system of the smokebox reactor according to any one of claims 1-4, comprising: in the case of a gas sample to be fed, calculating a target pressure of the gas sample to be fed in the cylinder (1) according to a first predetermined reaction reference concentration value, a volume of the smokebox reactor (7), a base pressure of the cylinder (1) in a vacuum state, and a volume of the cylinder (1); feeding a first gas sample into the cylinder (1) in a vacuum state; in the case that the pressure in the cylinder (1) reaches the target pressure, stopping feeding the first gas sample into the cylinder (1), feeding zero air from a zero air input end (9) into the cylinder (1), and carrying the first gas sample into the smokebox reactor, so that the first gas sample in the cylinder (1) is fed into the smokebox reactor, and the first gas sample in the smokebox reactor (7) reaches the first predetermined reaction reference concentration value.

6. The method according to claim 5, further comprising: in the case of a liquid sample to be fed, calculating a target volume of the liquid sample to be fed in the liquid jacket (22) according to a second predetermined reaction reference concentration value, a volume of the smokebox reactor (7), a mass and a density of the liquid sample in the liquid jacket (22); injecting a target volume of the liquid sample into the liquid jacket (22) from a liquid inlet (221), so that the target volume of the liquid sample generates a second gas sample after vaporization in the liquid jacket (22); feeding the second gas sample into the smokebox reactor (7), so that the second gas sample in the smokebox reactor (7) reaches the second predetermined reaction reference concentration value.

7. The method according to claim 6, further comprising: in the case that the volatility of the liquid sample is less than a preset volatility threshold during vaporization of the target volume of the liquid sample, heating the target volume of the liquid sample by an external heating system.

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