CN114113453A - Device, system and method for detecting content of total organic carbon in gas - Google Patents
Device, system and method for detecting content of total organic carbon in gas Download PDFInfo
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- CN114113453A CN114113453A CN202111481310.6A CN202111481310A CN114113453A CN 114113453 A CN114113453 A CN 114113453A CN 202111481310 A CN202111481310 A CN 202111481310A CN 114113453 A CN114113453 A CN 114113453A
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Abstract
The present disclosure relates to an apparatus, system and method for detecting the content of total organic carbon in a gas, wherein the apparatus comprises: the reaction unit comprises an airflow passage, the airflow passage comprises an air inlet and an air outlet, wherein air can enter the airflow passage through the air inlet under the action of suction force and is output through the air outlet after flowing through the airflow passage; a reaction temperature providing unit configured to provide a temperature of catalytic oxidation to the reaction unit to catalytically oxidize total organic carbon in the gas to inorganic carbon during the gas flows through the gas flow path. The system comprises the device, a sampling device, an inorganic carbon detection device and a determination device, wherein the sampling device collects gas, the inorganic carbon detection device determines the total content of inorganic carbon based on the gas input by the device and determines the background content of the inorganic carbon based on the gas input by the sampling device, and the determination device determines the content of total organic carbon based on the total content of the inorganic carbon and the background content of the inorganic carbon. Detection errors and cost are reduced.
Description
Technical Field
The present disclosure relates to the field of monitoring technologies, and more particularly, to an apparatus, system, and method for detecting the content of total organic carbon in a gas.
Background
The atmosphere contains a large amount of Total Organic Carbon (TOC), including Volatile Organic Compounds (VOCs), low Volatile Organic Compounds (voc), Organic aerosols, etc., which can change the concentration of free radicals in the air and thus affect atmospheric chemical processes. In addition, VOCs are important precursors of ozone and organic aerosols, both of which have important effects on human health and the climatic environment. In addition, the total organic carbon that settles to the surface can affect the carbon cycle of the ecosystem. Because the volatility difference of organic matters in the atmosphere is very large, the organic matters exist in various forms in the atmosphere, some exist in a gaseous state and a condensed state, and some exist in a particle state. This multiplicity of forms of presence makes it somewhat difficult to detect the concentration of all the organic species in the atmosphere with a single instrument. TOC represents the total carbon content of all organics and therefore can be used as a measure of the total organic concentration in the atmosphere.
The detection method in the related art has selectivity for the types of the detected organic matters, does not include all the organic matters, and cannot be used as a parameter for describing the total organic matter content because how many organic matters are not detected and cannot be known. In addition, in the detection method in the related art, the sampled gas is pumped into the room from the outside, and the inner wall of the gas transmission pipeline can adsorb organic matters, so that detection errors are caused.
Disclosure of Invention
The present disclosure provides an apparatus, system, and method for detecting the content of total organic carbon in a gas to at least reduce the error of the detection of total organic carbon.
According to one aspect of the present disclosure, there is provided an apparatus for collecting and converting a gas to detect the total organic carbon content of the gas, the apparatus comprising: the reaction unit comprises an airflow passage, the airflow passage comprises an air inlet and an air outlet, wherein air can enter the airflow passage through the air inlet under the action of suction force and is output through the air outlet after flowing through the airflow passage; a reaction temperature providing unit configured to provide a temperature of catalytic oxidation to the reaction unit to catalytically oxidize total organic carbon in the gas to inorganic carbon during the gas flows through the gas flow path.
In some embodiments, the apparatus further comprises: a first blocking unit disposed on one side of the gas flow path near the gas inlet and configured to block the catalyst in the reaction unit; and/or a second blocking unit disposed on a side of the gas flow path near the gas outlet and configured to block the catalyst in the reaction unit.
In some embodiments, the apparatus further comprises: the first end and the gas outlet of adapter are connected, and the second end of adapter can be connected with the gas transmission pipeline, and wherein, the internal diameter of gas outlet is greater than the internal diameter of gas transmission pipeline.
In some embodiments, the reaction temperature providing unit includes: the heating unit is sleeved on the reaction unit; a temperature detection unit configured to detect a temperature at which the reaction unit is heated; and the control unit is connected with the temperature detection unit and the heating unit and is configured to control the heating unit according to the temperature detected by the temperature detection unit so as to provide the temperature for catalytic oxidation to the reaction unit.
In some embodiments, a heating unit, comprising: the inner layer is sleeved on the reaction unit; an outer layer; and the electric heating element is arranged between the inner layer and the outer layer, is abutted against the inner layer to conduct heat, and forms a gap with the outer layer to insulate heat.
In some embodiments, the above apparatus further comprises: a housing; one or more connection units, wherein the housing is connected with the heating unit through the one or more connection units with a space therebetween.
According to another aspect of the present disclosure, there is provided a system for detecting the total organic carbon content in a gas, comprising: the apparatus provided by the foregoing of the present disclosure; an acquisition device configured to acquire a gas; a gas transmission pipeline; a suction generating device communicated with the gas transmission pipeline and configured to provide suction to the gas transmission pipeline; the inorganic carbon detection device is communicated with the device and the sampling device through a gas transmission pipeline and is configured to detect the content of inorganic carbon in the received gas; the switching device is arranged on the gas transmission pipeline and is configured to communicate the inorganic carbon detection device with the device in a first period and communicate the inorganic carbon detection device with the sampling device in a second period; and the first determination device is connected with the inorganic carbon detection device and is configured to determine the content of the total organic carbon in the gas based on the detection results of the inorganic carbon detection device in the first period and the second period.
In some embodiments, the system further comprises: the methane detection device is communicated with the device and the sampling device through a gas transmission pipeline and is configured to detect the content of methane in the received gas; wherein the switching device is further configured to communicate the methane detection device with the device during a first period and communicate the methane detection device with the sampling device during a second period; and the second determination device is connected with the methane detection device and is configured to determine the conversion rate indication of the catalytic oxidation based on the detection results of the methane detection device in the first period and the second period.
According to yet another aspect of the present disclosure, there is provided a system for detecting the total organic carbon content in a gas, comprising: the apparatus provided by the foregoing of the present disclosure; a sampling device configured to collect a gas; a first air delivery conduit and a first suction generating device configured to provide suction to the first air delivery conduit; a second air conduit and a second suction generating device configured to provide suction to the second air conduit; the first inorganic carbon detection device is communicated with the device through a first gas transmission pipeline and is configured to detect the content of inorganic carbon in the gas output by the device to obtain the total content of the inorganic carbon; the second inorganic carbon detection device is communicated with the sampling device through a second gas transmission pipeline and is configured to detect the content of inorganic carbon in the gas collected by the sampling device to obtain the background content of the inorganic carbon; and the first determining device is connected with the first inorganic carbon detection and detection device and the second inorganic carbon detection and detection device and is configured to determine the content of the total organic carbon in the gas based on the total content of the inorganic carbon and the background content of the inorganic carbon.
In some embodiments, the system further comprises: the first methane detection device is communicated with the device through a first gas transmission pipeline and is configured to detect the content of methane in the gas output by the device and obtain the residual methane; the second methane detection device is communicated with the sampling device through a second gas transmission pipeline and is configured to detect the content of methane in the gas collected by the sampling device to obtain the total amount of methane; and the second determination device is connected with the first methane detection device and the second methane detection device and is configured to determine the conversion rate indication of the catalytic oxidation based on the residual methane quantity and the total methane quantity.
According to yet another aspect of the present disclosure, there is provided a method for detecting the total organic carbon content in a gas, comprising: the device provided by the embodiment of the disclosure is used for collecting and converting gas, and collecting the gas through the collecting device; communicating an inorganic carbon detection device with the device during a first period, and communicating the inorganic carbon detection device with a sampling device during a second period; detecting the content of inorganic carbon in the received gas by an inorganic carbon detection device; and determining the content of the total organic carbon in the gas based on the detection results of the inorganic carbon detection device in the first period and the second period.
In some embodiments, the above method further comprises: communicating a methane detection device with the device during a first period, and communicating the methane detection device with a sampling device during a second period; detecting the content of methane in the received gas through a methane detection device; an indication of the conversion rate of the catalytic oxidation is determined based on the results of the methane detection device during the first period and the second period.
According to yet another aspect of the present disclosure, there is provided a method for detecting the total organic carbon content in a gas, comprising: the gas is collected and converted through the device disclosed by the invention, and the gas is collected through the sampling device; detecting the content of inorganic carbon in the gas output by the device through a first inorganic carbon detection device to obtain the total content of the inorganic carbon; detecting the content of inorganic carbon in the gas collected by the sampling device through a second inorganic carbon detection device to obtain the background content of the inorganic carbon; determining the total organic carbon content of the gas based on the total inorganic carbon content and the background inorganic carbon content.
In some embodiments, the above method further comprises: detecting the content of methane in the gas output by the device through a first methane detection device to obtain the residual methane; detecting the content of methane in the gas collected by the sampling device through a second methane detection device to obtain the total amount of methane; an indication of the conversion of the catalytic oxidation is determined based on the remaining amount of methane and the total amount of methane.
The beneficial effect of this disclosure does:
the device that is used for gathering and converting gas that this disclosed embodiment provided realizes gathering gas to total organic carbon converts inorganic carbon into in the gas of gathering, then with the gaseous output after the conversion, avoids the absorption to total organic carbon among the gas transmission process, thereby avoids the measuring error who causes from this. The system determines the content of the total organic carbon by detecting the inorganic carbon, and avoids the reduction of the detection accuracy caused by the fact that part of the total organic carbon cannot be detected. And, the cost of the inorganic carbon detection device is lower than that of the organic carbon detection device, so that the detection cost is reduced.
Drawings
In the following description of exemplary embodiments, taken in conjunction with the accompanying drawings, further details, features and advantages of the disclosure are disclosed,
in the drawings:
fig. 1 shows a schematic structural diagram of an apparatus for collecting and converting a gas according to an exemplary embodiment of the present disclosure;
FIG. 2 shows a schematic block diagram of a system of an exemplary embodiment of the present disclosure;
FIG. 3 illustrates another schematic structural diagram of a system of an exemplary embodiment of the present disclosure;
FIG. 4 illustrates a schematic view of a scenario for detecting the atmosphere according to an exemplary embodiment of the present disclosure;
FIG. 5 illustrates a flow chart of a method of detecting total organic carbon content in a gas according to an exemplary embodiment of the present disclosure;
fig. 6 illustrates another flowchart of a method of detecting a content of total organic carbon in a gas according to an exemplary embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
In the description of the present disclosure, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present disclosure and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present disclosure.
In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In the description herein, reference to the description of the terms "this embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
Aspects of the present disclosure are described below with reference to the accompanying drawings.
One aspect of the disclosed example relates to an apparatus for capturing and converting gas, enabling capturing of gas and conversion of Total Organic Carbon (TOC) in the captured gas to inorganic carbon (primarily CO)2Containing a small amount of CO) and then outputting the converted gas to avoid adsorption of the total organic carbon by the gas transmission pipeline in the gas transmission process, thereby avoiding measurement errors caused by the adsorption. Another aspect of the disclosed examples relates to a detection system for determining the total organic carbon content by detecting inorganic carbon to avoid a reduction in detection accuracy due to the inability to detect partial total organic carbon, total organic carbon adsorption. In addition, the cost of the inorganic carbon detection device is lower than that of the organic carbon detection device, so that the detection cost is reduced.
The "gas" of the present disclosure includes outdoor air (i.e., the atmosphere) or gas in a particular environment (e.g., gas in a chamber of a laboratory simulated atmospheric chemical reaction), which is not limited by the present disclosure.
Fig. 1 shows a schematic structural diagram of an apparatus for collecting and converting gas according to an exemplary embodiment of the present disclosure, through which the gas can be collected and the total organic carbon in the gas can be converted into inorganic carbon and then output, and referring to fig. 1, the apparatus 10 includes: a reaction unit 11 and a reaction temperature providing unit 12. Referring to fig. 1, the reaction unit 11 includes a gas flow path 111, and the gas flow path 111 includes a gas inlet 1111 and a gas outlet 1112. The gas can enter the gas flow path 111 through the gas inlet 1111 under the suction effect, and is output through the gas outlet 1112 after flowing through the gas flow path 111. Illustratively, the reaction unit 11 is a tube body defining a gas flow path 111. Fig. 1 illustrates an exemplary tube, but the present disclosure is not limited thereto and other shapes of passages for the air flow are possible. The reaction temperature providing unit 12 provides the reaction unit 11 with a temperature for catalytic oxidation to catalytically oxidize the total organic carbon in the gas into inorganic carbon during the gas flows through the gas flow path 111.
A catalyst may be disposed in the gas flow path 11, and the gas contacts the catalyst while flowing through the gas flow path 111, and is catalytically oxidized at the temperature provided by the reaction temperature providing unit 12, and at least a portion of the gas flow path 111 serves as both a path through which the gas flows and a reaction container. In the case of on-line continuous detection, gas is continuously introduced into the gas inlet 1111 by suction force (for example, suction force is generated by a suction force generating device such as a suction pump on the side of the gas outlet 1112, and the suction force may be generated by a detection device), and then flows through the gas flow path 111, and is subjected to catalytic oxidation during the process of flowing through the gas flow path 111.
In some examples, increasing the residence time of the gas in the gas flow path 111 helps to increase the conversion of total organic carbon in the gas to inorganic carbon, and for example, a gas flow path 111 of the same length and shape corresponds to a residence time proportional to the cross-sectional area of the gas flow path 111.
In the embodiment of the present disclosure, the reaction temperature providing unit 12 heats the reaction unit 11 to provide a temperature at which the catalytic oxidation is performed. In some examples, the reaction temperature providing unit 12 is disposed outside the reaction unit 11, and may have the same extension direction as the gas flow path 11 of the reaction unit 11.
In some examples, as shown with reference to fig. 1, the reaction temperature providing unit 12 may include: the heating unit 121 is sleeved on the reaction unit 11; a temperature detection unit 122 for detecting a temperature at which the reaction unit 11 is heated; and a control unit 123 connected to the temperature detection unit 122 and the heating unit 121, for controlling the heating unit 121 according to the temperature detected by the temperature detection unit 122 to provide the temperature for catalytic oxidation to the reaction unit 11. Wherein the temperature at which the catalytic oxidation is carried out can be set according to the characteristics of the catalyst.
Illustratively, the reaction cell 11 may be made using a high temperature resistant material, including but not limited to stainless steel. The temperature detection unit 122 may detect the temperature between the heating unit 121 and the reaction unit 11. The temperature sensing unit 122 may include a thermocouple (e.g., a type K thermocouple), and illustratively, a probe portion of the thermocouple may be interposed between the heating unit 121 and the reaction unit 11. The control unit 123 may include a proportional-integral-derivative (PID) controller connected to the temperature detection unit 122 and a Solid State Relay (SSR) connected to the heating unit 122, the PID controller being connected to the solid state relay. One end of the temperature detection unit 122 is connected with a PID controller, the temperature detected by the temperature detection unit 122 is fed back to the PID controller, and the PID controller controls the power-on state of the heating unit 121 through a solid-state relay so as to regulate the temperature.
As an example, a platinum catalyst (also referred to as a platinum-containing catalyst) may be used, and the temperature for catalytic oxidation may be set to about 480 ℃, so that approximately 100% of the total organic carbon including methane can be converted into inorganic carbon. In an exemplary test experiment, when the platinum catalyst was heated to 480 ℃, the oxidation efficiency of methane exceeded 98%, and considering that the molecular structure of methane is very stable and difficult to be oxidized, it was considered that other organic carbons had been completely oxidized into inorganic carbons. It should be understood that other catalysts, such as chromium-based catalysts, mixed metal catalysts, etc., are possible and are not described in further detail in the examples of the disclosure.
In some examples, and as shown with reference to fig. 1, the heating unit 121 includes: an inner layer 1211 disposed on the reaction unit 11 and made of an insulating material; an outer layer 1212; an electrical heating element 1213 is disposed between the inner layer 1211 and the outer layer 1212, and the electrical heating element 1213 abuts the inner layer 1211 to conduct heat and forms a gap with the outer layer 1212 to insulate heat. The inner layer 1211 and the outer layer 1212 may be connected by a connecting member, the connecting member is configured to fix the electric heating element 1213, and illustratively, the connecting member is annular, the two annular connecting members are respectively sleeved on two ends of the inner layer 1211, and the outer layer 1212 is disposed on the annular connecting member.
Illustratively, the electrical heating element 1213 may comprise a heating wire, the inner layer 1211 may comprise an insulating tube such as a corundum tube, and the outer layer 1212 may comprise a corundum or ceramic tube. Alternatively, the electrical heating element 1213 may comprise a plurality of heating wires, each heating wire abutting the inner layer 1211 and distributed axially along the inner layer 1211, the plurality of heating wires being distributed along the outer periphery of the inner layer; optionally, one or more heating wires may be wrapped around the outer wall of the inner layer 1211.
In some examples, as shown with reference to fig. 1, the apparatus 10 may further include: a housing 13, one or more connection units 14, wherein the housing 13 is connected with the heating unit 121 through the one or more connection units 14, and a space is formed between the housing 13 and the heating unit 121, and the space at least can reduce the heat exchange between the heating unit 121 and the outside. Illustratively, the housing 13 may be made of a corrosion resistant material (e.g., stainless steel) for long term use outdoors.
In some examples, the connection unit 14 may include a mica ring sleeved on the heating unit 122 and located in the housing 13, and the mica ring is fixedly connected with the heating unit 122 and the housing 13, for example, the mica ring is fixed with the heating unit 121 and the housing 13 by a high temperature resistant inorganic glue.
In some examples, as shown with reference to fig. 1, the apparatus 10 further comprises: and a first blocking unit 15 disposed on the side of the gas flow path 111 near the gas inlet 1111, for blocking the catalyst in the reaction unit 11 to prevent the catalyst from moving when the apparatus 10 moves. Taking the atmosphere as an example, since the volatility of the organic matters in the atmosphere is very different, the organic matters in the atmosphere exist in various forms, some exist in a gaseous state and a condensed state, and some exist in a particle state, the first blocking unit 15 is configured to block the catalyst in the reaction unit 11, and allow the organic matters existing in the particle state to enter the reaction unit 11, generally, the particle size of most organic matter particles in the air is less than 2.5 micrometers, so the pore size of the first blocking unit 15 is greater than 2.5 micrometers to allow the organic matter particles to pass through, for example, the pore size of the first blocking unit 15 may be greater than or equal to 100 micrometers. In addition, the organic particles have a boiling point substantially much lower than 480 ℃ and therefore do not adsorb on the first barrier unit 15. In some examples, the catalyst may be replaced from the side of the intake port 1111, and the first blocking unit 15 is detachably provided on the side of the airflow path 111 near the intake port 1111.
For example, the first blocking unit 15 may include a sintering net to block the catalyst from the side of the air inlet 1111, so as to prevent the catalyst from being displaced when the device 10 is displaced. Wherein the shape of the sintering net is adapted to the cross-sectional shape of the air flow passage 111, for example, the air flow passage 111 is circular, and the corresponding sintering net is a circular sintering net. The sintered mesh may be detachably or fixedly (e.g., welded) provided on the side of the gas flow path 111 near the gas inlet 1111, wherein the detachable manner is provided to enable replacement of the catalyst from the gas inlet 1111. Additionally, the sintered mesh may include one or more layers.
In some examples, as shown with reference to fig. 1, the apparatus 10 further comprises: the second blocking unit 16 is disposed on the side of the air flow path 111 close to the air outlet 1112, and configured to block the catalyst in the reaction unit 11 to prevent the catalyst from being influenced by the suction force and being output from the air outlet 1112 to the outside (for example, an air pipe). Illustratively, the second barrier unit 16 may be made of a high temperature resistant material such as quartz fiber, wherein the quartz fiber has high strength retention rate at high temperature, dimensional stability, thermal shock resistance, and chemical stability. In addition, the inner diameter of the gas transmission pipeline to which the gas outlet 1112 is connected may be set smaller than the inner diameter of the gas outlet 1112 to prevent the second barrier unit 16 made of quartz fiber from being sucked into the gas transmission pipeline.
In some examples, as shown with reference to fig. 1, the apparatus 10 further comprises: adapter 17, the first end of adapter 17 is connected with gas outlet 1112, and the second end of adapter 17 can be connected with the air pipeline. Illustratively, the inner diameter of the air outlet 1112 is larger than the inner diameter of the air delivery conduit to avoid drawing catalyst into the air delivery conduit.
Some specific examples of the above-described apparatus 10 are described below.
As one example, the reaction unit 11 may include a metal tube, such as a steel tube, which may contain a catalyst (e.g., a platinum catalyst) therein. The air outlet 1112 of the reaction unit 11 can be connected with an air pipeline through the adapter 17, and is connected with a detection instrument through the air pipeline. The inner layer 1211 may include a corundum tube for insulation and heat conduction, since the electric heating element 1213 (e.g., a heating wire) is electrically charged, and if it is in contact with the metal tube of the reaction unit 11, it is easily leaked out through the metal tube of the reaction unit 11, and the corundum tube is used to be spaced between the metal tube and the electric heating element 1213. A gap may be formed between the inner wall of the corundum tube of the inner layer 1211 and the outer wall of the metal tube of the reaction unit 11, and a probe of a thermocouple, which may include a thermocouple (e.g., a type K thermocouple), may be inserted into the gap to detect the temperature of the reaction unit 11. The outer layer 1212 may comprise a corundum tube, the outer layer 1212 and the inner layer 1211 may be connected by a mica ring, and the electrical heating element 1213 may be secured by the mica ring. The outer wall of the outer layer 1212 may be sleeved with a mica ring, and the mica ring may be fixed on the outer wall of the outer layer 1212 by a small amount of high temperature resistant inorganic glue. The housing 13 can prevent the reaction unit 11 and the reaction temperature providing unit 12 from being damaged, and can prevent water from being applied to the outside, etc. The housing 13 may be secured by a mica ring on the outer wall of the outer layer 1212.
As an example, the reaction unit 11 (using a metal tube) may have a length of 220mm, an outer diameter of 1/2 inches (i.e., 12.7mm), and a tube wall thickness of 1 mm. The thermal insulation 1211 (using a corundum tube) may have an inner diameter of 13.8mm, an outer diameter of 19mm and a length of 200 mm. The gap between the inner wall of the thermal insulation 1211 and the outer wall of the reaction unit 11 may be 1.1 mm. The thermal shield layer 1212 (using a corundum tube) may have an inner diameter of 35mm, an outer diameter of 45mm and a length of 194 mm. The adapter 17 may be an 1/2 inch to 1/4 inch adapter.
In some examples, the device 10 is arranged to be placed in such a manner that the air flow path 111 is kept horizontal, thereby preventing displacement of the catalyst, and achieving the purpose of waterproofing (i.e., preventing rainwater from entering into the air flow path 111 from the air inlet 1111 of the air flow path 111). Illustratively, the housing 13 is provided as a tubular body as shown in FIG. 1. As an example, referring to fig. 1, the reaction unit 11 is a tube, and for the convenience of installation, the apparatus 10 further includes: and an elbow 18, wherein one end of the elbow 18 is connected with the air outlet 1112 of the reaction unit 11 through the adapter 17, and forms a certain included angle (for example, 90 °) with the reaction unit 11, and the other end of the elbow 18 can be connected with an air pipeline. Accordingly, the end of the housing 13 at the elbow 18 has a bend that matches the bend 18. Illustratively, the housing 13 is detachably connected to the housing 13 at the lower side and the upper side for pipe and wire connection, and referring to fig. 1, the housing 13 includes a housing main body 131 and an extension portion 132, and the main body 131 and the extension portion 132 are detachably connected, for example, by flanges. The side of the housing body 131 connected to the extension 132 and the extension 132 have through holes for passing gas pipelines and other lines, in some embodiments.
In some examples of the present disclosure, the apparatus 10 is combined with an inorganic carbon detection device to form a system, which can be used to detect the total organic carbon content in a gas.
In some possible embodiments, the Total Organic Carbon content (TOC) in the ambient atmosphere, the equation (1) is calculated as follows: TOC-CO2+CO-(CO2+ CO). In this case, TOC represents the total organic carbon including methane.
Methane is generally distinguished from other organics in the air. On the one hand, the atmospheric methane content is very high with respect to non-methane organic matter, and its carbon content is higher than the sum of the contents of all other kinds of organic matter. On the other hand, methane is relatively stable, with a lifetime in the atmosphere of about 11 years, while other organic substances have a very short lifetime and can rapidly influence the progress of atmospheric chemical reactions, so CH is used4Discussed differently from other organics. Thus, in some possible embodiments, the Total Organic Carbon content (TOC) in the ambient atmosphere, the equation (2) is calculated as follows: TOC-CO2+CO+CH4-(CO2*+CO*+CH4*)。
The prime marks in the above formulas (1) and (2) represent the concentration of the substance in the ambient atmosphere (referred to as background content in this disclosure), and the non-prime marks represent the corresponding concentrations measured after catalytic oxidation.
The system of the exemplary embodiment of the present disclosure is explained below.
Fig. 2 shows a schematic structural diagram of a system according to an exemplary embodiment of the present disclosure, and referring to fig. 2, the system 200 is used for detecting the content of total organic carbon in a gas, and includes: a device 10; an acquisition device 20 for acquiring gas; a gas transmission line 30; a suction generating device 40 communicated with the gas transmission pipeline 30 and used for providing suction to the gas transmission pipeline 30; the inorganic carbon detection device 50 is communicated with the device 10 and the sampling device 20 through a gas transmission pipeline 30 and is used for detecting the content of inorganic carbon in the received gas; a switching device 60 provided on the gas transmission pipeline 30 for communicating the inorganic carbon detection device 50 with the device 10 during a first period and communicating the inorganic carbon detection device 50 with the sampling device 20 during a second period; and the first determining device 70 is connected with the inorganic carbon detecting device 50 and is used for determining the content of the total organic carbon in the gas based on the detection results of the inorganic carbon detecting device 50 in the first period and the second period.
In some examples, the harvesting device 20 may be a sampling tube, which may have the same inner diameter as the gas delivery line, and which may be part of the gas delivery line 30. Furthermore, although fig. 3 illustrates the device 10 separate from the collection device 20, this is not a limitation, for example, in some examples, the collection device 20 may be integrated with the device 10.
In some examples, the suction generating device 40 may include a suction pump, which is not limited by the embodiments of the present disclosure.
In some examples, detection of inorganic carbon may employ, but is not limited to, cavity-based ring-down spectroscopy techniques with CO2For example, the ring-down cavity formed by the high-reflectivity reflector is used, so that infrared light emitted by the light source is reflected back and forth between the cavities containing the gas to be measured to form oscillation. Calculating the intensity of light due to CO by detecting the small amount of light overflowing from one of the mirrors using a fast electric detector2The resulting light attenuation process, the concentration of which is calculated with the mirror reflectivity known.
Referring to fig. 2, the switching device 60 connects the inorganic carbon detecting device 50 to the device 10 during the first period, and the gas is collected and converted by the device 10 and then supplied to the inorganic carbon detecting device 50. The total organic carbon in the collected gas is converted into inorganic carbon, and the inorganic carbon in the converted gas comprises: inorganic carbon resulting from the conversion of total organic carbon, and inorganic carbon contained in the gas prior to conversion. The inorganic carbon content measured during the first period is referred to herein as the total inorganic carbon content. The switching device 60 communicates the inorganic carbon detection device 50 with the collection device 20 during the second period, the gas collects the gas from the collection device 20 and then is transmitted to the inorganic carbon detection device 50 through the gas transmission pipeline 30, the gas during the second period includes the inherent inorganic carbon of the gas because the gas is not converted, and the inorganic carbon detection device 50 detects the inorganic carbon content of the gas during the second period. The inorganic carbon content measured during the second period is referred to herein as the inorganic carbon background content.
Considering that the inorganic carbon content of the gas does not differ greatly between the first period and the second period, and the total organic carbon content of the gas remains substantially unchanged for a short period of time, the inorganic carbon content measured during the second period can be considered as the background inorganic carbon content of the first period gas. The first determination means 70 may determine the content of total organic carbon in the gas based on the detection results of the inorganic carbon detection means 50 in the first period and the second period, i.e., the total inorganic carbon content and the background inorganic carbon content. Illustratively, the system 200 periodically repeats the measurement, and can achieve continuous measurement on-line.
In some examples, as shown with reference to fig. 2, system 200 further includes: the methane detection device 80 is communicated with the device 10 and the sampling device 20 through the gas transmission pipeline 30 and is used for detecting the content of methane in the received gas; wherein the switching device 60 is used for communicating the methane detection device 80 with the device 10 in the first period and communicating the methane detection device 80 with the sampling device 20 in the second period.
The catalyst can be used (CH) because the catalyst is poisoned after long service life and the catalytic efficiency is obviously reduced4*-CH4)/CH4Denotes the conversion of methane, wherein CH4Content of methane, CH, before catalytic oxidation4Representing the residual methane content after the shift reaction. The conversion rate can reflect the catalytic effect of the catalyst to a certain extent, so that whether the catalyst needs to be replaced or not is judged. In some examples, a second determining device 90 is coupled to the methane detecting device 80 and configured to determine an indication of a conversion rate of the catalytic oxidation based on the results of the methane detecting device 80 during the first period and the second period. Thus, the detection of the catalytic efficiency of the catalyst is realized as a reference for updating the catalyst.
In some examples, the first determining device 70 may be connected to the methane detecting device 80, and determine the content of the total organic carbon in the gas using the above formula (2) based on the detection results of the inorganic carbon detecting device 50 in the first period and the second period, that is, the total inorganic carbon content and the background inorganic carbon content, and the detection results of the methane detecting device 80 in the first period and the second period.
For example, referring to fig. 2, the switching device 60 may include: the first air inlet of the three-way electromagnetic valve 61 is communicated with the air outlet 1112 of the reaction unit 11, the second air inlet of the three-way electromagnetic valve 61 is communicated with the sampling device 20, and the air outlet of the three-way electromagnetic valve 61 is communicated with the inorganic carbon detection device 50 and the methane detection device 80. The three-way solenoid valve 61 is connected to a time relay 62. The time relay 62 controls the three-way electromagnetic valve 61 to connect the gas outlet 1112 of the reaction unit 11, the inorganic carbon detection device 50 and the methane detection device 80 within a first preset time period; then, the time relay 62 switches the three-way electromagnetic valve 61 to disconnect the air outlet 1112, the inorganic carbon detection device 50 and the methane detection device 80 of the reaction unit 11 within a second preset time period, and to connect the sampling device 20, the inorganic carbon detection device 50 and the methane detection device 80.
It should be understood that the inorganic carbon detection device 50 and the methane detection device 80 are schematically illustrated as separate components in fig. 2, and the embodiments of the present disclosure are not limited thereto, for example, the inorganic carbon detection device 50 and the methane detection device 80 may use the same sample chamber for methane and inorganic carbon detection of a gas sample in the same sample chamber.
Fig. 3 shows another schematic structural diagram of a system according to an exemplary embodiment of the present disclosure, and referring to fig. 3, a system 300 for detecting the content of total organic carbon in a gas includes: a device 10; a sampling device 20 for collecting gas; a first air conduit 311 and a first suction force generating device 321, the first suction force generating device 321 being arranged to provide suction to the first air conduit 311; a second air conduit 312 and a second suction generating device 322, the second suction generating device 322 being adapted to provide suction to the second air conduit 312; a first inorganic carbon detection device 331, which is communicated with the device 10 through a first gas transmission pipeline 311, and is used for detecting the content of inorganic carbon in the gas output by the device 10 to obtain the total content of the inorganic carbon; the second inorganic carbon detection device 332 is communicated with the sampling device 20 through the second gas transmission pipeline 312, and is used for detecting the content of inorganic carbon in the gas collected by the sampling device 20 to obtain the background content of the inorganic carbon; and the first determining device 340 is connected with the first inorganic carbon detection device 331 and the second inorganic carbon detection device 332, and is used for determining the content of the total organic carbon in the gas based on the total content of the inorganic carbon and the background content of the inorganic carbon.
In some examples, as shown with reference to fig. 3, the system 300 further includes: the first methane detection device 351 is communicated with the device 10 through the first gas transmission pipeline 311 and is used for detecting the content of methane in the gas output by the device 10 to obtain the residual methane; the second methane detection device 352 is communicated with the sampling device 20 through the second gas transmission pipeline 312, and is used for detecting the content of methane in the gas collected by the sampling device 20 to obtain the total amount of methane.
As explained earlier in this disclosure, the conversion of methane can reflect the catalytic effect of the catalyst to some extent, thereby determining whether the catalyst needs to be replaced. And a second determining device 360 connected to the first methane detecting device 351 and the second methane detecting device 352 and used for determining the conversion rate indication of the catalytic oxidation based on the residual methane quantity and the total methane quantity. Thus, the detection of the catalytic efficiency of the catalyst is realized as a reference for updating the catalyst.
In some examples, the first determining device 340 may be connected to the first methane detecting device 351 and the second methane detecting device 352, and determine the content of total organic carbon in the gas by using the above formula (2) based on the total content of inorganic carbon and the background content of inorganic carbon, and the detection results of the first methane detecting device 351 and the second methane detecting device 352.
Fig. 4 is a schematic view illustrating a scene of detecting the atmosphere according to an exemplary embodiment of the disclosure, and referring to fig. 4, the apparatus 10 and the collecting device 20 are disposed on a top 510 of a building 500, the detecting device 600 is disposed in an interior 520 of the building 500, and the detecting device 600 is communicated with the apparatus 10 and the collecting device 20 through a pipeline. It should be understood that fig. 4 shows the device 10 as an example in the case of a building 500, and since the device 10 is small in size and can be installed on the top of a container or a navigation vehicle (also called an atmospheric navigation monitoring vehicle), organic matters in the sampled air are directly converted into inorganic carbon, and then the inorganic carbon is introduced into a detection instrument in a room through a gas pipeline, and the inorganic carbon is hardly adsorbed by the inner wall of the gas pipeline, so that errors caused by the loss of the inner wall can be reduced to a great extent.
The detection device 600 monitors the content of the total organic carbon based on the content of the inorganic carbon by detecting the content of the inorganic carbon. The detection apparatus 600 may also detect a level of methane and determine a conversion indicator for the catalytic oxidation based on the conversion of methane. In some examples, detection device 600 may include a device capable of detecting CO2And various small-sized instruments of CO and methane are matched, so that the manufacturing cost is low. In some examples, detection device 600 may include an integrated CO2And CO and methane detection equipment. In some examples, the detection apparatus 600 is a pump-type detection apparatus, and the suction force is generated by a pump of the detection apparatus 600 to sample gas.
In some examples, detection device 600 may be as described with reference to fig. 2. Referring to fig. 2, in the first period, the apparatus 10 is in communication with the detection device 600, the apparatus 10 disposed outdoors samples the atmosphere and converts the total organic carbon in the atmosphere into inorganic carbon, and the detection device 600 detects the inorganic carbon in the gas from the apparatus 10 to obtain the total content of the inorganic carbon. Next, in a second period after the first period, the sampling device 20 communicates with the detection device 600, the sampling device 20 installed outdoors samples the atmosphere, and the detection device 600 detects inorganic carbon in the gas from the sampling device 10 to obtain the background content of the inorganic carbon. Considering that the concentration of the total organic carbon is basically maintained unchanged in a short time (between the first period and the second period), because the inorganic carbon (i.e. the background content of the inorganic carbon) exists in the atmosphere, the background content of the inorganic carbon can be subtracted from the detected total content of the inorganic carbon, so as to obtain the inorganic carbon converted from the organic matters in the air, and further estimate the total organic carbon content in the ambient atmosphere.
In some examples, the detection device 600 may be as shown in fig. 3. As shown in fig. 3, the apparatus 10 and the sampling apparatus 20 can synchronously provide the sampled gas to the detection device 600, wherein the total organic carbon in the gas sampled by the apparatus 10 is converted into inorganic carbon. The detecting device 600 detects the content of inorganic carbon in the gas from the device 10 and the gas from the sampling device 20 respectively to obtain the total content of inorganic carbon and the background content of inorganic carbon. Further, the content of total organic carbon in the gas sampled at this time is determined based on the total content of inorganic carbon and the background content of inorganic carbon.
The disclosed embodiments also provide a method for detecting the content of total organic carbon in a gas, and an exemplary embodiment of the method is described below with reference to fig. 2 and 3, respectively.
Fig. 5 shows a flowchart of a method for detecting the content of total organic carbon in a gas according to an exemplary embodiment of the present disclosure, which uses the system shown in fig. 2 to detect the content of total organic carbon in the gas, and the method includes steps S501 to S505 as shown in fig. 5.
Step S501, collecting and converting the gas by the device 10.
In step S502, gas is collected by the collection unit 20.
In step S503, the switching device 60 connects the inorganic carbon detection device 50 to the device 10 in the first period, and connects the inorganic carbon detection device 50 to the sampling device 20 in the second period.
In step S504, the content of inorganic carbon in the received gas is detected by the inorganic carbon detection device 50.
In step S505, the content of total organic carbon in the gas is determined based on the detection results of the inorganic carbon detection device 50 in the first period and the second period.
In step S505, the total organic carbon content in the gas may be determined using the above formula (1).
In some examples, the method may further include: a methane detection device 80 is communicated with the device 10 in a first period, and the methane detection device 80 is communicated with the sampling device 20 in a second period; the content of methane in the received gas is detected by the methane detection device 80.
In some examples, an indication of the conversion rate of the catalytic oxidation may also be determined based on the detection results of the methane detection device 80 during the first period and the second period, at least whether to replace the catalyst may be known.
In some examples, in step S505, the content of total organic carbon in the gas is determined using the above formula (2) based on the detection results of the methane detection device 80 during the first period and the second period.
Fig. 6 shows another flowchart of a method for detecting the content of total organic carbon in a gas according to an exemplary embodiment of the present disclosure, which uses the system shown in fig. 3 to detect the content of total organic carbon in the gas, and the method includes steps S601 to S605 as shown in fig. 6.
Step S601, collecting and converting the gas by the device 10.
Step S602, gas is collected by the sampling device 20.
In step S603, the content of inorganic carbon in the gas output by the apparatus 10 is detected by the first inorganic carbon detection apparatus 331, so as to obtain the total content of inorganic carbon.
In step S604, the content of inorganic carbon in the gas collected by the sampling device 20 is detected by the second inorganic carbon detection device 332, so as to obtain the background content of inorganic carbon.
Step S605, determining the total organic carbon content in the gas based on the total inorganic carbon content and the background inorganic carbon content.
In step S605, the content of total organic carbon in the gas may be determined using the above formula (1).
In some examples, the method further comprises: detecting the content of methane in the gas output by the device 10 through a first methane detection device 351 to obtain the residual methane; the content of methane in the gas collected 20 by the sampling device is detected by the second methane detection device 352 to obtain the total amount of methane.
In some examples, an indication of the conversion rate of the catalytic oxidation may also be determined based on the remaining amount of methane and the total amount of methane, at least whether to replace the catalyst.
In some examples, in step S605, the content of total organic carbon in the gas may be determined based on the above formula (2) based on the remaining amount of methane and the total amount of methane.
The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the present disclosure, but rather as the subject matter of the present disclosure is to be accorded the full scope consistent with the claims.
Claims (14)
1. An apparatus for collecting and converting a gas to detect the total organic carbon content of the gas, the apparatus comprising:
the reaction unit comprises an airflow passage, the airflow passage comprises an air inlet and an air outlet, and the gas can enter the airflow passage through the air inlet under the action of suction force and is output through the air outlet after flowing through the airflow passage;
a reaction temperature providing unit configured to provide a temperature of catalytic oxidation to the reaction unit to catalytically oxidize total organic carbon in the gas to inorganic carbon during the gas flows through the gas flow passage.
2. The apparatus of claim 1, further comprising:
a first blocking unit disposed on one side of the gas flow path near the gas inlet and configured to block a catalyst in the reaction unit; and/or
A second blocking unit disposed on a side of the gas flow path near the gas outlet and configured to block the catalyst within the reaction unit.
3. The apparatus of claim 1, further comprising: the adapter, the first end of adapter with the gas outlet is connected, the second end of adapter can be connected with the gas transmission pipeline, wherein, the internal diameter of gas outlet is greater than the internal diameter of gas transmission pipeline.
4. The apparatus of claim 1, wherein the reaction temperature providing unit comprises:
the heating unit is sleeved on the reaction unit;
a temperature detection unit configured to detect a temperature at which the reaction unit is heated;
and the control unit is connected with the temperature detection unit and the heating unit and is configured to control the heating unit according to the temperature detected by the temperature detection unit so as to provide the temperature for the catalytic oxidation to the reaction unit.
5. The apparatus of claim 4, wherein the heating unit comprises:
the inner layer is made of an insulating material and sleeved on the reaction unit;
an outer layer;
and the electric heating element is arranged between the inner layer and the outer layer, is abutted against the inner layer to conduct heat, and forms a gap with the outer layer to insulate heat.
6. The apparatus of claim 5, further comprising:
a housing;
one or more connection units, wherein the housing is connected with the heating unit through the one or more connection units with a space therebetween.
7. A system for detecting the total organic carbon content of a gas, comprising:
the device of any one of claims 1 to 6;
a collection device configured to collect the gas;
a gas transmission pipeline;
a suction generating device in communication with the gas pipeline and configured to provide suction to the gas pipeline;
the inorganic carbon detection device is communicated with the device and the sampling device through the gas transmission pipeline and is configured to detect the content of inorganic carbon in the received gas;
a switching device disposed on the gas transmission pipeline and configured to communicate the inorganic carbon detection device with the device during a first period and communicate the inorganic carbon detection device with the sampling device during a second period;
first determining means connected to the inorganic carbon detecting means and configured to determine the content of total organic carbon in the gas based on detection results of the inorganic carbon detecting means during the first period and the second period.
8. The system of claim 7, further comprising:
the methane detection device is communicated with the device and the sampling device through the gas transmission pipeline and is configured to detect the content of methane in the received gas; wherein the switching device is further configured to communicate the methane detection device with the device during the first period and communicate the methane detection device with the sampling device during the second period;
second determining means, connected to the methane detecting means, configured to determine an indication of a conversion rate of the catalytic oxidation based on detection results of the methane detecting means during the first period and the second period.
9. A system for detecting the total organic carbon content of a gas, comprising:
the device of any one of claims 1 to 6;
a sampling device configured to collect the gas;
a first air conduit and a first suction generating device configured to provide suction to the first air conduit;
a second air conduit and a second suction generating device configured to provide suction to the second air conduit;
the first inorganic carbon detection device is communicated with the device through the first gas transmission pipeline and is configured to detect the content of inorganic carbon in the gas output by the device to obtain the total content of the inorganic carbon;
the second inorganic carbon detection device is communicated with the sampling device through the second gas transmission pipeline and is configured to detect the content of inorganic carbon in the gas collected by the sampling device to obtain the background content of the inorganic carbon;
first determining means, connected to the first inorganic carbon detection means and the second inorganic carbon detection means, configured to determine the content of total organic carbon in the gas based on the total content of inorganic carbon and the background content of inorganic carbon.
10. The system of claim 9, further comprising:
the first methane detection device is communicated with the device through the first gas transmission pipeline and is configured to detect the content of methane in the gas output by the device to obtain the residual methane;
the second methane detection device is communicated with the sampling device through the second gas transmission pipeline and is configured to detect the content of methane in the gas collected by the sampling device to obtain the total amount of methane;
second determining means, coupled to the first methane detecting means and the second methane detecting means, configured to determine an indication of a conversion rate of the catalytic oxidation based on the remaining methane amount and the total methane amount.
11. A method for detecting the total organic carbon content of a gas, comprising:
collecting and converting a gas by the device of any one of claims 1 to 6, and collecting the gas by a collecting device;
communicating an inorganic carbon detection device with the device during a first period and communicating the inorganic carbon detection device with the sampling device during a second period;
detecting the content of inorganic carbon in the received gas through the inorganic carbon detection device;
determining the content of total organic carbon in the gas based on the detection results of the inorganic carbon detection device in the first period and the second period.
12. The method of claim 11, further comprising:
communicating a methane detection device with the device during the first period and communicating the methane detection device with the sampling device during the second period;
detecting the content of methane in the received gas through the methane detection device;
determining a conversion rate indication of the catalytic oxidation based on the results of the methane detection device during the first period and the second period.
13. A method for detecting the total organic carbon content of a gas, comprising:
collecting and converting a gas by the device of any one of claims 1 to 6 and collecting the gas by a sampling device;
detecting the content of inorganic carbon in the gas output by the device through a first inorganic carbon detection device to obtain the total content of the inorganic carbon;
detecting the content of inorganic carbon in the gas collected by the sampling device through a second inorganic carbon detection device to obtain the background content of the inorganic carbon;
determining a total organic carbon content in the gas based on the total inorganic carbon content and the background inorganic carbon content.
14. The method of claim 13, further comprising:
detecting the content of methane in the gas output by the device through a first methane detection device to obtain the residual methane;
detecting the content of methane in the gas collected by the sampling device through a second methane detection device to obtain the total amount of methane;
determining an indication of a conversion rate of the catalytic oxidation based on the remaining amount of methane and the total amount of methane.
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