A portable flue gas analyzer with switchable measurement path

Abstract

The application provides a portable flue gas analyzer capable of switching measuring paths, comprising a flue gas guide, a flue gas analyzer and a condensation treatment part; the flue gas guide and the flue gas analyzer are coaxially connected, and the flue gas guide can rotate around the shaft relative to the flue gas analyzer; the flue gas guide and the flue gas analyzer are provided with a plurality of flow channels; by rotating the flue gas guide, the flue gas can enter the analysis gas chamber of the flue gas analyzer in different paths; when the flue gas passes through the condensation treatment part before entering the analysis gas chamber, the analyzer is in a cold dry method detection state; when the flue gas does not pass through the condensation treatment part before entering the analysis gas chamber, the analyzer is in a hot wet method detection state. The portable flue gas analyzer provided by the application can switch between the cold dry method and the hot wet method, and the defects that the existing products can only adopt one detection method are remedied.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas analysis, in particular to a portable flue gas analyzer capable of switching measurement paths. BACKGROUND

[0002] The flue gas analyzer is an equipment for continuously analyzing and measuring the content of flue gas such as CO2, CO, NO x , SO2, etc. in flue gas by using an electrochemical sensor, which is often used for detecting the pollution emission of small oil-fired or gas-fired boilers or monitoring the air environment near the pollution source. The existing flue gas analyzer often uses ultraviolet differential method to analyze the composition of flue gas, and the ultraviolet differential method instrument includes cold dry method and hot wet method. The cold dry method refers to that after the flue gas is filtered and condensed to remove most of the water in the flue gas, the flue gas is introduced into a gas chamber for ultraviolet analysis to obtain the composition and concentration information of the gas. The hot wet method refers to that after the flue gas is filtered, it is directly introduced into a gas chamber for ultraviolet analysis without condensation. The cold dry method has lower requirements on the performance of the instrument, and the data is intuitive. In the case of low content of soluble gas, the data can be better obtained. However, the cold dry method has higher requirements on the condensation water remover of the pretreatment system, which needs to remove more than 95% of water while retaining 95% of SO2, that is, the dew point of the flue gas condensing outlet is kept below 4℃. The hot wet method avoids the need for a condensation water remover, but has higher requirements on the performance of the instrument. The measurement result is the wet basis concentration, which needs to be converted into the dry basis concentration through a certain formula, and the reflected data is not intuitive.

[0003] The existing flue gas analyzer usually only includes one of the cold dry method or the hot wet method. For example, the integrated ultraviolet flue gas analyzer disclosed in the patent application No. CN201621005242.0 does not set a condensation module, and the method used in ultraviolet detection is the hot wet method. The flue gas pretreatment system of the flue gas analyzer disclosed in the patent application No. CN202022430643.3 uses the cold dry method for flue gas detection. The pretreatment system is provided with a condensation frame, and the flue gas needs to be condensed and dehydrated by the condensation frame before entering the detection instrument. The portable flue gas analyzer mainly serves as a data comparison function, and its working scene needs to be compatible with different compared systems. Therefore, it needs to be compatible with different extraction methods to meet different use scenes. The currently marketed portable flue gas analyzer can only use one of the cold dry method or the hot wet method, which is difficult to meet the detection needs in different scenes. SUMMARY

[0004] In order to solve the above problems, the application provides a portable flue gas analyzer with switchable detection path, which can change the path of flue gas entering the analysis gas chamber through simple operation, so that the analyzer can freely switch between cold dry method and hot wet method, thereby meeting the detection requirements of different scenes.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0006] A portable flue gas analyzer with switchable measurement path, comprising a flue gas flow guide, a flue gas analysis component and a condensation treatment component; the flue gas flow guide has a docking end, the docking end is formed with an import interface, an export interface, a first rotary interface and a second rotary interface, the import interface is in communication with a flue gas import flow channel arranged in the flue gas flow guide, the export interface is in communication with a flue gas export flow channel arranged in the flue gas flow guide, and the first rotary interface and the second rotary interface are in communication with each other through a rotary flow channel arranged in the flue gas flow guide; the flue gas analysis component has a matching end corresponding to the docking end, and an analysis gas chamber is arranged in the flue gas analysis component, the analysis gas chamber is in communication with a gas chamber import flow channel and a gas chamber export flow channel, and the gas chamber import flow channel and the gas chamber export flow channel form a gas chamber import port and a gas chamber export port at the matching end respectively; the flue gas analysis component is further provided with a condensation import flow channel and a condensation export flow channel, and the first ends of the condensation import flow channel and the condensation export flow channel form a condensation import port and a condensation export port at the matching end respectively, and the second ends of the condensation import flow channel and the condensation export flow channel are connected with the condensation treatment component; the docking end and the matching end form coaxial movable connection, and the flue gas flow guide can rotate around the shaft relative to the flue gas analysis component; the import interface and the export interface are symmetrically arranged relative to the shaft, the first rotary interface and the second rotary interface are symmetrically arranged relative to the shaft, the gas chamber export port and the condensation import port are symmetrically arranged relative to the shaft, and the gas chamber import port and the condensation export port are symmetrically arranged relative to the shaft; at the docking end, the import interface, the export interface, the first rotary interface and the second rotary interface are arranged equidistantly around the shaft, and at the matching end, the gas chamber import port, the gas chamber export port, the condensation import port and the condensation export port are arranged equidistantly around the shaft.

[0007] The difference between cold dry method and hot wet method in flow path is that: in cold dry method, water in flue gas must be removed before analyzing the composition of flue gas in the analysis gas chamber, so the flue gas needs to be treated by a condensation water removal device before entering the analysis gas chamber, while in hot wet method, the flue gas enters the analysis gas chamber without water removal, so whether the flue gas enters the analysis gas chamber first or the condensation water removal device first is the key to distinguish cold dry method and hot wet method in flow path. In the existing technical solutions, the flow path of flue gas is usually fixed, so it is impossible to switch between cold dry method and hot wet method.

[0008] The portable flue gas analyzer has flue gas guide members and flue gas analysis members movably connected with each other, the flue gas guide members are used for contacting and guiding flue gas, and the flue gas analysis members are used for guiding the guided flue gas into an analysis gas chamber according to a certain path for analysis. Usually, the flue gas guide member is designed as a thin rod structure with a relatively small diameter, so as to facilitate the collection of flue gas. The butt joint end (i.e., the end close to the flue gas analysis member) of the flue gas guide member is provided with four through openings, i.e., a guiding-in interface, a guiding-out interface, a first rotary interface and a second rotary interface. The matching end (i.e., the end close to the flue gas guide member) of the flue gas analysis member is provided with four through openings, i.e., a gas chamber guiding-in opening, a gas chamber guiding-out opening, a condensation guiding-in opening and a condensation guiding-out opening. The four through openings on the butt joint end and the four through openings on the matching end are equidistantly arranged on the same size circle around the axis, so that when any one of the through openings on the butt joint end is aligned with one of the through openings on the matching end, the remaining three through openings on the butt joint end can also be naturally aligned with the remaining three through openings on the matching end. Through the arrangement of the through openings and the flow channel inside the flue gas guide member and the flue gas analysis member, the switching between the cold dry method and the hot wet method can be realized in the following manner: when the guiding-in interface is communicated with the condensation guiding-in opening, the guiding-out interface is communicated with the gas chamber guiding-out opening, and the first rotary interface and the second rotary interface are respectively communicated with the gas chamber guiding-in opening and the condensation guiding-out opening, the guiding-in path of flue gas is flue gas guiding-in flow channel-condensation guiding-in flow channel-condensation treatment member-condensation guiding-out flow channel-rotary flow channel-gas chamber guiding-in flow channel-analysis gas chamber-gas chamber guiding-out flow channel-flue gas guiding-out flow channel, that is, the flue gas will first enter the condensation treatment member to remove moisture and then enter the analysis gas chamber for detection, and at this time, the detection method is the cold dry method; on the basis of the above-mentioned cold dry method, the flue gas guide member is rotated by 90°, at this time, the guiding-in interface is communicated with the gas chamber guiding-in opening, the guiding-out interface is communicated with the condensation guiding-out opening, and the first rotary interface and the second rotary interface are respectively communicated with the gas chamber guiding-out opening and the condensation guiding-in opening, the guiding-in path of flue gas is flue gas guiding-in flow channel-gas chamber guiding-in flow channel-analysis gas chamber-gas chamber guiding-out flow channel-rotary flow channel-condensation guiding-in flow channel-condensation treatment member-condensation guiding-out flow channel-flue gas guiding-out flow channel, at this time, the flue gas will not pass through the condensation treatment member before entering the analysis gas chamber, and at this time, the detection method is the hot wet method. The flue gas guiding-in path can be switched by rotating the flue gas guide member by 90° according to the unique design of the interfaces and the flow channels, so that the analyzer can be switched between the cold dry method and the hot wet method, the detection requirements in different scenes can be realized, and the analyzer does not need additional auxiliary members and electrical control elements compared with the existing products, and the purpose can be achieved only by designing the interfaces and the flow channels, so that the existing mold can be greatly utilized for production, the production cost will not change obviously, and economic benefits can be achieved.

[0009] Further, the flue gas analyzer further comprises a second analysis member, a first end of the second analysis member is connected with the downstream of the condensation treatment member, and a second end of the second analysis member is connected with the condensation guiding-out flow channel.

[0010] Further, the analysis gas chamber of the flue gas analysis element is provided with an ultraviolet analysis device, and the second analysis element is provided with an infrared analysis device.

[0011] The ultraviolet analysis device and the infrared analysis device can be preferably provided to perform multiple detection on the flue gas, so that the detection range of the flue gas analyzer is wider, and the detection results of the two sets of devices can also be complementary and contrasted, so that the accuracy of the detection results is improved. For the second analysis element, because the infrared absorption peak of water is relatively strong and the wavelength range is relatively wide, the absorption peak of other gas components is easily covered, so the second analysis element needs to be arranged downstream of the condensation treatment element. No matter whether the flue gas analyzer is in the cold dry method or the hot and humid method, the flue gas will pass through the condensation treatment element to remove water before entering the second analysis element.

[0012] Further, the shaft center position of the matching end portion is provided with a movable shaft, and the butt joint end portion and the movable shaft form a connection.

[0013] Further, a plurality of matching connecting holes are arranged on the movable shaft, and the butt joint end portion is provided with a matching connector corresponding to the matching connecting hole.

[0014] Further, the butt joint end portion and the matching end portion form a limit matching structure, and the maximum rotation angle of the butt joint end portion around the shaft is 90°.

[0015] Further, the butt joint end portion forms a semicircular ring-shaped limit clamping groove, and the matching end portion forms two limit clamping heads, and the included angle between the two line segments formed by the shaft centers of the two limit clamping heads is 90°.

[0016] The butt joint end portion and the matching end portion of the present application both have four through holes, so generally there are four butt joint modes, and two of them are the cold dry method butt joint mode and the hot and humid method butt joint mode required by the present application, and the other two error access modes need to be avoided. Therefore, the limit structure can be arranged to make the butt joint end portion only rotate 90° relative to the matching end portion, and within the 90° rotation range, the two can only be switched between the cold dry method butt joint mode and the hot and humid method butt joint mode.

[0017] Further, the flue gas guide element is further provided with a flue gas filtering component, and the flue gas filtering component is connected with the guide inlet flow channel.

[0018] Further, the flue gas analyzer further comprises a humidity meter, and the first end of the humidity meter is connected with the upstream of the condensation treatment element, and the second end of the humidity meter is connected with the condensation guide inlet flow channel.

[0019] As described above, the technical scheme of the present application can achieve the following beneficial effects:

[0020] 1. The portable flue gas analyzer provided by the present application is provided with a flue gas guide member and a flue gas analysis member which are coaxially and movably connected, the butt joint end of the flue gas guide member and the matching end of the flue gas analysis member are each provided with four interfaces, different butt joint modes between the interfaces can make the flow channel in the flue gas guide member and the flow channel in the flue gas analysis member form different paths, so that the flue gas can be switched between two introduction modes of directly entering the analysis gas chamber and entering the analysis gas chamber after being treated by the condensation treatment member, and the flue gas analyzer can be switched between two detection methods of the cold dry method and the hot wet method, thus the defect that the existing product can only adopt one detection mode is made up.

[0021] 2. Compared with the existing product, the portable flue gas analyzer provided by the present application does not need to increase auxiliary members and electric control elements, can greatly utilize the existing mold during production and processing, and the production cost will not be obviously changed, thus good economic benefits are obtained.

[0022] 3. The portable flue gas analyzer provided by the present application can realize switching of the flue gas detection path by rotating the flue gas guide member, is simple to use and convenient to operate, and further, the present application can be provided with a limiting structure, so that the rotation angle of the flue gas guide member is limited within 90°, further convenient operation is obtained, and flow channel butt joint errors are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure schematic view of the butt joint end and the matching end in embodiment 1.

[0024] Figure 2 It is a structure schematic view of the flue gas analyzer in the cold dry method state in embodiment 1.

[0025] Figure 3 It is a structure schematic view of the flue gas analyzer in the hot wet method state in embodiment 1.

[0026] Figure 4 It is a structure schematic view of the flue gas analyzer in the cold dry method state in embodiment 2.

[0027] Figure 5 It is a structure schematic view of the flue gas analyzer in the hot wet method state in embodiment 2.

[0028] In the figure, 1-smoke gas flow guide, 2-smoke gas analysis part, 3-humidity meter, 4-condensation processing part, 5-second analysis part, 11-smoke gas import flow channel, 12-smoke gas export flow channel, 13-rotary flow channel, 14-smoke gas filter part, 15-matching joint, 16-limiting clamping groove, 21-analysis gas chamber, 22-gas chamber import flow channel, 23-gas chamber export flow channel, 24-condensation import flow channel, 25-condensation export flow channel, 26-movable rotating shaft, 27a, 27b-limiting clamping head, 261-matching joint hole, A1-export interface, A2-first rotary interface, A3-second rotary interface, A4-import interface, B1-gas chamber export, B2-gas chamber import, B3-condensation export, B4-condensation import. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. EMBODIMENT

[0031] As Figures 1-3 shown, the present embodiment provides a portable smoke gas analyzer with switchable measurement path, which is composed of three parts, the first part contains smoke gas flow guide 1, the second part contains smoke gas analysis part 2, and the third part contains humidity meter 3 and condensation processing part 4, wherein the butt joint end of the smoke gas flow guide and the matching end of the smoke gas analysis part form a movable connection, so that the smoke gas flow guide can rotate around the shaft within a certain range.

[0032] Specifically, the smoke guide member comprises a smoke inlet flow channel 11, a smoke outlet flow channel 12 and a rotary flow channel 13, the smoke inlet flow channel 11 forms an inlet interface A4 at the butt joint end, the smoke outlet flow channel 12 forms an outlet interface A1 at the butt joint end, the rotary flow channel forms a first rotary interface A2 and a second rotary interface A3 at the butt joint end respectively, and the smoke inlet flow channel and the smoke outlet flow channel are communicated with the outside at the end away from the butt joint end; the smoke analysis member comprises an analysis gas chamber 21, a gas chamber inlet flow channel 22, a gas chamber outlet flow channel 23, a condensation inlet flow channel 24 and a condensation outlet flow channel 25, the gas chamber inlet flow channel 22 forms a gas chamber inlet B2 at the matching end, the gas chamber outlet flow channel 23 forms a gas chamber outlet B1 at the matching end, the condensation inlet flow channel forms a condensation inlet B4 at the matching end, the condensation outlet flow channel forms a condensation outlet B3 at the matching end, the gas chamber inlet flow channel and the gas chamber outlet flow channel are communicated with the analysis gas chamber at the end away from the matching end, and the condensation inlet flow channel and the condensation outlet flow channel are communicated with the upstream of the hygrometer and the downstream of the condensation processing member respectively at the end away from the matching end. The analysis gas chamber detects the composition of the smoke by the ultraviolet differential method.

[0033] The middle part of the butt joint end is provided with a matching joint 15, the middle part of the matching end is provided with a movable rotating shaft 26, a plurality of matching joint holes 261 are arranged on the movable rotating shaft 26, the matching joint 15 can be inserted into the matching joint hole 261, the butt joint end and the matching end are connected, and the butt joint end can be rotated around the shaft. A semicircular limiting clamping groove 16 is arranged on the butt joint end, and a limiting clamping head 27a and a limiting clamping head 27b are arranged on the matching end, the limiting clamping head 27a and the limiting clamping head 27b are perpendicular to each other, when the butt joint end and the matching end are connected, the two limiting clamping heads are embedded in the matching clamping groove, and when the butt joint end is rotated around the shaft, the limiting clamping head and the matching clamping groove can only rotate within a range of 90°.

[0034] In combination Figure 1 With Figure 2 , when the smoke analyzer provided by the embodiment is in the cold dry detection state, the inlet interface A4 is butted with the condensation inlet B4, the outlet interface A1 is butted with the gas chamber outlet B1, the first rotary interface A2 is butted with the gas chamber inlet B2, and the second rotary interface A3 is butted with the condensation outlet B3, at this time, the flow path of the smoke in the analyzer is: the smoke inlet flow channel 11-condensation inlet flow channel 24-hygrometer 3-condensation processing member 4-condensation outlet flow channel 25-rotary flow channel 13-gas chamber inlet flow channel 22-analysis gas chamber 21-gas chamber outlet flow channel 23-smoke outlet flow channel 12, the smoke passes through the condensation processing member before entering the analysis gas chamber, and the moisture in the smoke is removed, so that the cold dry detection of the smoke is realized.

[0035] Combination Figure 1 and Figure 3 In this embodiment, when the flue gas analyzer is in the hot and wet method detection state, the inlet interface A4 is connected to the gas chamber inlet B2, the outlet interface A1 is connected to the condenser outlet B3, the first rotary interface A2 is connected to the gas chamber outlet B1, and the second rotary interface A3 is connected to the condenser inlet B4. At this time, the path of flue gas flow in the analyzer is: flue gas inlet channel 11 - gas chamber inlet channel 22 - analysis gas chamber 21 - gas chamber outlet channel 23 - rotary channel 13 - condenser inlet channel 24 - hygrometer 3 - condenser treatment component 4 - condenser outlet channel 25 - flue gas outlet channel 12. The flue gas will not pass through the condenser treatment component before entering the analysis gas chamber, thus realizing the hot and wet method detection of flue gas.

[0036] It should be noted that in both of the above detection methods, the flue gas guide and the flue gas analyzer must be in a state of co-heating to avoid condensation of water vapor in the flue gas, which would affect the measurement. Example

[0037] like Figure 3 and Figure 4 As shown, this embodiment provides another portable flue gas analyzer with switchable measurement paths. The flue gas analyzer includes three parts. The structure of the first and second parts is the same as that of Embodiment 1. In addition to the hygrometer 3 and the condensation treatment unit 4, the third part also includes a second analysis unit 5. The second analysis unit 5 detects the flue gas components by infrared absorption method, while the analysis chamber 21 of the flue gas analysis unit 2 detects the flue gas components by ultraviolet differential method.

[0038] like Figure 3 As shown, when the flue gas analyzer provided in this embodiment is in the cold-drying detection state, the docking method of the docking end and the mating end is the same as that in the cold-drying method in Embodiment 1. At this time, the flow path of the flue gas in the analyzer is: flue gas inlet channel 11 - condensation inlet channel 24 - hygrometer 3 - condensation treatment component 4 - second analysis component 5 - condensation outlet channel 25 - rotary channel 13 - gas chamber inlet channel 22 - analysis gas chamber 21 - gas chamber outlet channel 23 - flue gas outlet channel 12. Before entering the second analysis component for infrared analysis, the flue gas will pass through the condensation treatment component to remove the moisture. After infrared analysis, the flue gas will enter the analysis gas chamber for ultraviolet analysis, realizing infrared detection and cold-drying detection of the flue gas.

[0039] like Figure 4The smoke analyzer provided by the embodiment shown is in the hot and wet detection state, the butt joint mode of the butt joint end and the matched end is the same as that in the hot and wet method in the embodiment 1, at this time, the flow path of the smoke in the analyzer is: the smoke is introduced into the flow channel 11, the flow channel 22 of the gas chamber, the analysis gas chamber 21, the flow channel 23 of the gas chamber, the rotary flow channel 13, the condensation introduction flow channel 24, the hygrometer 3, the condensation processing piece 4, the second analysis piece 5, the condensation discharge flow channel 25 and the smoke discharge flow channel 12, the smoke first enters the analysis gas chamber in the state without water removal to perform the ultraviolet analysis, then the water is removed through the condensation processing piece, and then the smoke enters the second analysis piece to perform the infrared analysis, so that the infrared analysis and the hot and wet analysis of the smoke are realized.

[0040] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A portable flue gas analyzer with switchable measurement path, characterized in that The utility model provides a smoke guide, smoke analysis and condensation treatment, the smoke guide has a docking end, the docking end forms import interface, export interface, first rotary interface and second rotary interface, the import interface communicates with the smoke import flow channel arranged in the smoke guide, the export interface communicates with the smoke export flow channel arranged in the smoke guide, the first rotary interface and the second rotary interface communicate with each other through the rotary flow channel arranged in the smoke guide, the smoke analysis has a cooperation end corresponding to the docking end, and the analysis gas chamber is arranged in the smoke analysis, and the analysis gas chamber forms communication with the gas chamber import flow channel and the gas chamber export flow channel, the gas chamber import flow channel and the gas chamber export flow channel form the gas chamber guide inlet and the gas chamber guide outlet respectively in the cooperation end, and the first end of the condensation import flow channel and the condensation export flow channel forms the condensation guide inlet and the condensation guide outlet respectively in the cooperation end, and the second end of the condensation import flow channel and the condensation export flow channel is connected with the condensation treatment, the docking end and the cooperation end form coaxial movable connection, and the smoke guide can rotate around the shaft relative to the smoke analysis, the import interface and the export interface are symmetrically arranged relative to the shaft, the first rotary interface and the second rotary interface are symmetrically arranged relative to the shaft, the gas chamber export flow channel and the condensation import flow channel are symmetrically arranged relative to the shaft, the gas chamber import flow channel and the condensation export flow channel are symmetrically arranged relative to the shaft, the import interface, the export interface, the first rotary interface and the second rotary interface are arranged equidistantly around the shaft in the docking end, and the gas chamber import flow channel, the gas chamber export flow channel, the condensation import flow channel and the condensation export flow channel are arranged equidistantly around the shaft in the cooperation end, the cooperation end is provided with a movable rotating shaft, and the docking end is connected with the movable rotating shaft.

2. A portable flue gas analyzer according to claim 1, characterised in that: The second analysis is further arranged, and the first end of the second analysis is connected with the downstream of the condensation treatment, and the second end of the second analysis is connected with the condensation export flow channel.

3. A portable flue gas analyzer switchable between measurement paths according to claim 2, characterized in that: The analysis gas chamber of the smoke analysis is provided with ultraviolet analysis device, and the second analysis is provided with infrared analysis device.

4. The portable flue gas analyzer of claim 1, wherein: The movable rotating shaft is provided with a plurality of cooperation connecting holes, and the docking end is provided with the cooperation connecting head corresponding to the cooperation connecting hole.

5. The portable flue gas analyzer of claim 1, wherein: The docking end and the cooperation end form the limiting cooperation structure, and the maximum rotation angle of the docking end around the shaft is 90 degrees.

6. A portable flue gas analyzer according to claim 5, wherein: The docking end forms the semicircular annular limiting clamping groove, the cooperation end forms two limiting clamping heads, and the included angle between the two line segments formed by the two limiting clamping heads is 90 degrees.

7. The portable flue gas analyzer of claim 1, wherein: The smoke guide is further provided with the smoke filter part, and the smoke filter part is connected with the import flow channel.

8. The portable flue gas analyzer of claim 1, wherein: The humidity instrument is further arranged, and the first end of the humidity instrument is connected with the upstream of the condensation treatment, and the second end of the humidity instrument is connected with the condensation import flow channel.

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