Gas sampling equipment

Abstract

The utility model discloses gas sampling equipment which comprises a probe rod main body arranged in a pipeline; the filter element is arranged in the pipeline, the filter element is fixedly connected with the first end of the probe rod main body, and the filter element and the probe rod main body are coaxially arranged; the back-blowing heating assembly is communicated with the second end of the probe rod main body and the transmission pipeline through a tee joint and is suitable for heating back-blowing gas and then conveying the back-blowing gas to the tee joint, so that the back-blowing gas passes through the tee joint and the probe rod main body and then blows the interior of the filter element, and dust adsorbed on the surface of the filter element is blown away. To-be-detected gas in the pipeline is suitable for entering from the filter element, entering the probe rod main body after being filtered by the filter element, and entering the transmission pipeline through the tee joint; and the calibration assembly is communicated with the transmission pipeline and is suitable for heating the calibration gas and then conveying the calibration gas to the transmission pipeline, so that the temperature of the calibration gas in the transmission pipeline is the same as that of the to-be-detected gas. Adsorption loss in the sampling process can be avoided, and the measurement precision of the to-be-measured gas is improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a gas sampling device. Background Art

[0002] The gas after combustion in industrial kilns contains a large number of gas components that are harmful to the environment. Therefore, the tail gas after combustion in industrial kilns needs to be treated in a series of ways, such as denitrification, dust removal, desulfurization, etc., so as to purify the tail gas before it is discharged into the atmosphere. At present, the requirements for gas detection are getting higher and higher. Not only the accuracy of the measurement technology and the measurement equipment itself is getting more and more attention, but also, because the content of the measured gas is usually low, usually at the ppm (Part per million) level, the gas sampling equipment is also getting more and more attention. In order to achieve higher gas measurement accuracy, it should be ensured that the gas sampling equipment has no adsorption loss during the sampling process and can support the full-process calibration of the equipment, thereby improving the measurement accuracy of the entire system.

[0003] The gas sampling equipment in the prior art is only provided with a tee on the probe rod for backflushing, and no flow path for passing the standard gas is provided. On the one hand, directly backflushing through the tee will cause problems such as water condensation and compound crystallization in the gas. On the other hand, directly passing the standard gas from the tee will cause adsorption loss during the sampling process, thereby resulting in low measurement accuracy.

[0004] Therefore, a gas sampling device is needed to solve the above technical problems. Utility Model Content

[0005] To this end, the present application provides a gas sampling device to solve or at least alleviate the above problems.

[0006] According to one aspect of the present application, a gas sampling device is provided, which is suitable for being connected to a pipeline to sample the gas to be tested in the pipeline, and includes: a probe body, which is suitable for being placed in the pipeline; a filter element, which is suitable for being placed in the pipeline, the filter element is fixedly connected to the first end of the probe body and is coaxially arranged with the probe body; a backflush heating assembly, which is connected to the second end of the probe body and a transmission pipeline via a tee, and is suitable for heating the backflush gas and then delivering the backflush gas to the tee, so that the backflush gas is purged from the inside of the filter element after passing through the tee and the probe body to purge dust adsorbed on the surface of the filter element, wherein the gas to be tested in the pipeline is suitable for entering from the filter element, entering the probe body after being filtered by the filter element, and entering the transmission pipeline via the tee; a calibration assembly, which is connected to the transmission pipeline, and is suitable for heating the calibration gas and then delivering the calibration gas to the transmission pipeline, so that the calibration gas in the transmission pipeline has the same temperature as the gas to be tested.

[0007] Optionally, in the gas sampling device according to the present application, the transmission pipeline is connected to a gas analyzer, and is suitable for transmitting the gas to be measured and the calibration gas in the transmission pipeline to the gas analyzer, so as to measure the gas to be measured by the gas analyzer.

[0008] Optionally, in the gas sampling equipment according to the present application, a flow pipeline and a heating rod are provided inside the calibration component, and a first insulation layer and a protective shell are provided outside the flow pipeline. The heating rod is suitable for heating the flow pipeline so as to heat the calibration gas passing through the flow pipeline.

[0009] Optionally, in the gas sampling device according to the present application, a temperature measuring and heating component is provided on the calibration component, and the temperature measuring and heating component is used to heat the calibration component and measure the temperature of the calibration component so as to keep the calibration component in a constant temperature state.

[0010] Optionally, in the gas sampling device according to the present application, a gas interface is provided on the calibration component so that the calibration gas can be connected through the gas interface.

[0011] Optionally, in the gas sampling equipment according to the present application, the backblowing heating assembly is an electric heating pipeline, which includes a stainless steel pipe and an electric heating wire wound around the stainless steel pipe, so as to heat the backblowing gas when the backblowing gas passes through the stainless steel pipe.

[0012] Optionally, in the gas sampling device according to the present application, the electric heating pipeline further includes a second insulation layer and a waterproof sheath wrapped around the electric heating wire.

[0013] Optionally, in the gas sampling device according to the present application, the gas to be tested is flue gas.

[0014] Optionally, in the gas sampling device according to the present application, the backflush gas is water-free and oil-free compressed air or compressed nitrogen.

[0015] Optionally, in the gas sampling device according to the present application, the calibration gas includes nitrogen or compressed air for zero point calibration.

[0016] According to the technical solution of the present application, a gas sampling device is provided. By setting a back-blowing heating component, the back-blowing heating component is connected to the probe body and the transmission pipeline through a tee, and the back-blowing gas can be heated and then purged from the inside of the filter element after passing through the tee and the probe body. In this way, the back-blowing gas is heated by the back-blowing heating component, which can avoid problems such as water condensation and compound crystallization in the gas to be measured (flue gas) caused by back-blowing. In addition, the present application sets a calibration component, which can heat the calibration gas and then transport the calibration gas to the transmission pipeline, so that the calibration gas in the transmission pipeline has the same temperature as the gas to be measured. In this way, the problem of adsorption of the calibration gas by the flow path caused by too low temperature can be solved, adsorption loss during the sampling process can be avoided, and measurement errors caused by different gas temperatures can be avoided, thereby improving the measurement accuracy of the gas to be measured.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To achieve the above and related purposes, certain illustrative aspects are described herein in conjunction with the following description and accompanying drawings, which indicate various ways in which the principles disclosed herein can be practiced, and all aspects and their equivalents are intended to fall within the scope of the claimed subject matter. The above and other purposes, features and advantages of the present disclosure will become more apparent by reading the following detailed description in conjunction with the accompanying drawings. Throughout the present disclosure, the same reference numerals generally refer to the same parts or elements.

[0019] Figure 1 , Figure 2 The schematic diagrams of the structures of a gas sampling device 100 provided according to an embodiment of the present application are respectively shown. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0021] The prior art gas sampling equipment directly back-flushing through a tee will cause problems such as water condensation and compound crystallization in the gas, and there will be adsorption loss during the sampling process, resulting in low measurement accuracy. To this end, the present application proposes a new gas sampling equipment, which can avoid problems such as water condensation and compound crystallization in the gas to be measured caused by back-flushing by setting a back-flushing heating component and a calibration component, and can avoid adsorption loss during the sampling process, thereby improving the measurement accuracy of the gas to be measured.

[0022] Figure 1 , Figure 2 The schematic diagrams of the structures of a gas sampling device 100 provided according to an embodiment of the present application are respectively shown.

[0023] According to an embodiment of the present application, the gas sampling device 100 can be connected to a pipeline for conveying the gas to be tested, so as to sample the gas to be tested in the pipeline, and then the gas to be tested can be measured by a gas detector. In some embodiments, the gas to be tested can be specifically flue gas. By sampling the flue gas in the pipeline with the gas sampling device 100, ammonia, HF, HCL, CO, CO2 and other gases in the flue gas can be measured.

[0024] like Figure 1 and Figure 2 As shown, in the embodiment of the present application, the gas sampling device 100 at least includes a calibration component 110 , a backflush heating component 120 , a probe body 130 , a filter element 150 , and a transmission pipeline 170 .

[0025] During sampling by the gas sampling device 100 of the present application, the probe body 130 and the filter element 150 can be placed in the pipeline, wherein the filter element 150 is fixedly connected to the first end of the probe body 130 and the filter element 150 is coaxially arranged with the probe body 130 .

[0026] The second end of the probe body 130 (the other end opposite to the first end of the probe body 130) is connected to the backflush heating assembly 120 and the transmission pipeline 170 via the tee 140. In other words, the backflush heating assembly 120 is connected to the second end of the probe body 130 and the transmission pipeline 170 via the tee 140.

[0027] It should be noted that the first end and the second end of the probe body 130 are two opposite ends of the probe body 130. Figure 2 The second end of the probe body 130 is Figure 2 The left end shown in .

[0028] The back-blowing heating assembly 120 can be connected to the back-blowing gas, and the back-blowing heating assembly 120 can heat the back-blowing gas and transmit the heated back-blowing gas to the tee 140. Then, the heated back-blowing gas can pass through the tee 140 and the probe body 130 and then be purged from the inside of the filter element 150 to purge the dust adsorbed on the surface of the filter element 150. It should be noted that heating the back-blowing gas by the back-blowing heating assembly 120 can avoid problems such as water condensation and compound crystallization in the gas to be tested (flue gas) caused by back-blowing.

[0029] According to the embodiment of the present application, during the sampling process, the gas to be tested in the pipeline can enter the gas sampling device from the filter element 150, and the gas to be tested can enter the probe body 130 after being filtered by the filter element 150, and then, after passing through the probe body 130, it can enter the transmission pipeline 170 through the tee 140. It should be understood that the filter element 150 is used to filter impurities in the gas to be tested (flue gas).

[0030] According to the gas sampling device 100 of the present application, a calibration component 110 is also provided. The calibration component 110 is connected to the transmission pipeline 170, and the calibration component 110 can be connected to the calibration gas (i.e., standard gas), and the calibration component 110 can heat the calibration gas and transport the heated calibration gas to the transmission pipeline 170, so that the calibration gas in the transmission pipeline 170 has the same temperature as the gas to be measured. Based on this, the problem of adsorption of the calibration gas by the flow path caused by too low temperature can be solved, the adsorption loss during the sampling process can be avoided, and the measurement error caused by different gas temperatures can be avoided, thereby improving the measurement accuracy of the gas to be measured.

[0031] In some embodiments, the transmission line 170 can be connected to a gas analyzer (not shown in the figure). After the gas to be measured enters the transmission line 170, it can be transmitted to the gas analyzer via the transmission line 170 so that the gas to be measured can be measured by the gas analyzer. In addition, after entering the transmission line 170, the calibration gas can also be transmitted to the gas analyzer via the transmission line 170. That is, by connecting the transmission line 170 to the gas analyzer, the gas to be measured and the calibration gas in the transmission line 170 can be transmitted to the gas analyzer so that the gas to be measured can be measured by the gas analyzer.

[0032] In some embodiments, Figure 1 and Figure 2 As shown, the probe body 130 is cylindrical, and the filter element 150 extends outward from the first end of the probe body 130 .

[0033] In some embodiments, the backflush gas may be water-free and oil-free compressed air or compressed nitrogen. The calibration gas may include nitrogen or compressed air for zero point calibration.

[0034] In some embodiments, a flow pipeline and a heating rod are provided inside the calibration assembly 110, and a first insulation layer and a protective shell are provided outside the flow pipeline. The heating rod is used to heat the flow pipeline so as to heat the calibration gas passing through the flow pipeline. In a specific embodiment, the heating rod can be implemented as any electric heating device, and the present application does not make specific restrictions on this.

[0035] In some embodiments, Figure 1 As shown, the calibration component 110 is provided with a temperature measuring and heating component 180, which is used to heat the calibration component 110 and measure the temperature of the calibration component 110 (circulation pipeline) so as to keep the calibration component 110 in a constant temperature state and realize constant temperature control of the calibration component 110.

[0036] In addition, if Figure 1 and Figure 2 As shown, a gas interface 160 is also provided on the calibration component 110 so that calibration gas can be connected through the gas interface 160 .

[0037] In some embodiments, the back-blowing heating assembly 120 can be implemented as an electric heating pipeline. The electric heating pipeline specifically includes a stainless steel pipe and an electric heating wire wound on the stainless steel pipe. The back-blowing gas can pass through the stainless steel pipe, and according to the above-mentioned electric heating pipeline, the back-blowing gas can be heated when the back-blowing gas passes through the stainless steel pipe. In addition, the electric heating pipeline also includes a second insulation layer and a waterproof sheath coated outside the electric heating wire. In one implementation, the second insulation layer can be implemented as insulation cotton, but the present application is not limited thereto.

[0038] According to the gas sampling device 100 provided in the embodiment of the present application, by setting a back-blowing heating component, the back-blowing heating component is connected to the probe body and the transmission pipeline through a tee, and the back-blowing gas can be heated and then purged from the inside of the filter element after passing through the tee and the probe body. In this way, by heating the back-blowing gas through the back-blowing heating component, problems such as water condensation and compound crystallization in the gas to be measured (flue gas) caused by back-blowing can be avoided. Moreover, the present application sets a calibration component, and the calibration component can heat the calibration gas and then transport the calibration gas to the transmission pipeline, so that the calibration gas in the transmission pipeline has the same temperature as the gas to be measured. In this way, the problem of adsorption of the calibration gas by the flow path caused by too low temperature can be solved, adsorption loss during the sampling process can be avoided, and measurement errors caused by different gas temperatures can be avoided, thereby improving the measurement accuracy of the gas to be measured.

[0039] In the description of this specification, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. In addition, the directions or positional relationships indicated by the terms "front", "rear", "upper", "lower", "inner", "outer", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as limiting this application.

[0040] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0041] Similarly, it should be understood that in order to streamline the disclosure and help understand one or more of the various application aspects, in the above description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0042] Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in the devices described in the embodiment, or alternatively may be located in one or more devices different from the devices in the examples. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0043] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0044] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present application and to form different embodiments.

[0045] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved, and is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0046] Although the present application has been described according to a limited number of embodiments, it will be appreciated by those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the present application thus described. In addition, it should be noted that the language used in this specification is selected primarily for the purpose of readability and teaching, rather than for the purpose of explaining or limiting the subject matter of the present application. Therefore, many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. For the scope of the present application, the disclosure made to the present application is illustrative rather than restrictive, and the scope of the present application is limited by the appended claims.

Claims

1. A gas sampling device, suitable for connecting to a pipeline to sample the gas to be tested in the pipeline, characterized in that: include: A probe body, adapted to be placed in the pipe; A filter element, adapted to be placed in the pipeline, wherein the filter element is fixedly connected to the first end of the probe body and is coaxially arranged with the probe body; A back-blowing heating assembly is connected to the second end of the probe body and the transmission pipeline via a tee, and is suitable for heating the back-blowing gas and then delivering the back-blowing gas to the tee, so that the back-blowing gas passes through the tee and the probe body and then blows from the inside of the filter element to blow away the dust adsorbed on the surface of the filter element, wherein the gas to be tested in the pipeline is suitable for entering from the filter element, entering the probe body after being filtered by the filter element, and entering the transmission pipeline via the tee; The calibration component is connected to the transmission pipeline and is suitable for heating the calibration gas and then delivering the calibration gas to the transmission pipeline so that the calibration gas in the transmission pipeline has the same temperature as the gas to be measured.

2. The gas sampling device according to claim 1, characterized in that The transmission pipeline is connected to the gas analyzer and is suitable for transmitting the gas to be measured and the calibration gas in the transmission pipeline to the gas analyzer, so that the gas to be measured can be measured by the gas analyzer.

3. The gas sampling device according to claim 1, characterized in that: A flow pipeline and a heating rod are provided inside the calibration component, a first heat-insulating layer and a protective shell are provided outside the flow pipeline, and the heating rod is suitable for heating the flow pipeline so as to heat the calibration gas passing through the flow pipeline.

4. The gas sampling device according to claim 3, characterized in that The calibration component is provided with a temperature measuring and heating component, and the temperature measuring and heating component is used to heat the calibration component and measure the temperature of the calibration component so as to keep the calibration component in a constant temperature state.

5. The gas sampling device according to claim 3, characterized in that: The calibration component is provided with a gas interface so as to access the calibration gas through the gas interface.

6. The gas sampling device according to any one of claims 1 to 5, characterized in that: The back-blowing heating component is an electric heating pipeline, which includes a stainless steel pipe and an electric heating wire wound around the stainless steel pipe, so as to heat the back-blowing gas when the back-blowing gas passes through the stainless steel pipe.

7. The gas sampling device according to claim 6, characterized in that The electric heating pipeline also includes a second insulation layer and a waterproof sheath covering the electric heating wire.

8. The gas sampling device according to any one of claims 1 to 5, characterized in that: The gas to be tested is flue gas.

9. The gas sampling device according to any one of claims 1 to 5, characterized in that: The backflush gas is water-free and oil-free compressed air or compressed nitrogen.

10. The gas sampling device according to any one of claims 1 to 5, characterized in that: The calibration gas includes nitrogen or compressed air for zero point calibration.

Images