Sampling probe supporting structure

Abstract

The utility model discloses a sampling exploring tube supporting structure which comprises a sleeve supporting frame, an adapter tube, a sleeve, a flange sleeve and a sampling exploring tube, the adapter tube is vertically inserted into the side wall of a flue and penetrates into the flue, and the sleeve is inserted into the flue through a pipeline of the adapter tube and is limited and fixed through the sleeve supporting frame arranged in the flue. The flange sleeve is hermetically inserted into a pipeline opening, far away from the flue, of the adapter pipe, a through and communicated mounting hole channel is formed between the flange sleeve and the sleeve, and the detection end of the sampling probe pipe is inserted into the mounting hole channel from the end, far away from the flue, of the flange sleeve, penetrates out of the sleeve and is located in the flue; the other end of the sampling probe tube is positioned at the end part of the flange sleeve far away from the flue and is externally connected with detection equipment. The device can be directly installed on the side wall of the flue in a sealed mode through the adapter pipe, the sleeve and the flange sleeve are used for supporting to prevent dust from directly washing the sampling probe pipe, and the sampling probe pipe is externally connected with detection equipment to conduct real-time detection on the flue.

Description

Technical Field

[0001] This utility model relates to the field of structural technology for flue gas sampling, and specifically to a sampling probe support structure. Background Technology

[0002] The flue gas flow field in thermal power plant denitrification systems is affected by factors such as flue structure and catalysts, resulting in uneven velocity and composition distribution. Most single-point monitoring in denitrification systems can only represent the nitrogen oxide concentration at that specific point and cannot accurately reflect the nitrogen oxide distribution across the entire flue cross-section. Currently, most denitrification retrofits involve zoned measurement, and the ammonia injection rate in each zone is controlled based on NOx content to prevent excessive ammonia escape and clogging of the air preheater. This also achieves energy conservation and emission reduction, realizing a win-win situation for both economic and environmental benefits.

[0003] In particular, zonal measurement generally requires the insertion of sampling probes from both sides of the denitrification flue. This ensures that the measurement points are representative and also controls the length of the probes, avoiding the problems of excessively long probes being prone to breakage and inconvenient maintenance.

[0004] However, some power plants may not have fully considered the issue of multi-point sampling during the denitrification system design phase, and only laid platforms on one side of the flue. This makes it impossible to insert sampling probes from both sides of the flue, and the accuracy of flue measurements cannot be guaranteed by only measuring from one side. If platforms are added later, additional steel structure supports and passageways are required, leading to a significant increase in construction costs.

[0005] Therefore, there is an urgent need for a sampling probe support structure to solve the problem that the sampling probe can only be inserted from one side of the flue for some denitrification flue zone measurements, which leads to the inability to guarantee measurement accuracy. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing a sampling probe support structure to solve the problem that some denitrification flue gas duct zoning measurements can only be performed from one side, resulting in compromised measurement accuracy.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A sampling probe support structure includes a sleeve support frame, a transfer pipe, a sleeve, a flange sleeve, and a sampling probe. The transfer pipe is vertically inserted into the side wall of the flue and extends into the interior of the flue. The sleeve is inserted into the interior of the flue through the pipe of the transfer pipe and is limited and fixed by the sleeve support frame set in the flue. The flange sleeve is sealed and inserted at the pipe opening of the transfer pipe away from the flue, and a through and communicating installation channel is provided between the flange sleeve and the sleeve. The detection end of the sampling probe is inserted into the installation channel from the end of the flange sleeve away from the flue and passes through the sleeve and is located inside the flue. The other end of the sampling probe is located at the end of the flange sleeve away from the flue and is connected to an external detection device.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] Furthermore, the sleeve support frame includes an upper support channel steel, a lower support channel steel, and a middle channel steel. The upper support channel steel and the lower support channel steel are arranged in parallel, and the middle channel steel is vertically connected between the upper support channel steel and the lower support channel steel. The upper support channel steel is parallel to the sleeve and installed inside the flue, and the lower support channel steel is used to fit and fix to the side wall of the sleeve.

[0011] Furthermore, the sleeve and the lower support channel steel are fixedly connected by at least two staggered industrial clamps.

[0012] Furthermore, the sleeve support frame also includes diagonal bracing channel steel. The intermediate channel steel is vertically connected between the upper support channel steel and the lower support channel steel and is located in the middle position. An oblique bracing channel steel is connected to each side of the upper support channel steel between the intermediate channel steel and the intermediate channel steel. An oblique bracing channel steel is connected to each side of the lower support channel steel between the intermediate channel steel and the intermediate channel steel.

[0013] Furthermore, there is a gap between the sleeve wall inside the adapter pipe and the inner wall of the adapter pipe.

[0014] Furthermore, there is a gap between the end of the flange sleeve located inside the adapter pipe and the end of the sleeve.

[0015] Furthermore, there is a gap between the pipe wall of the flange sleeve located inside the transfer pipe and the inner wall of the transfer pipe, and the pipe opening of the transfer pipe away from the flue is sealed to the pipe wall of the flange sleeve.

[0016] Furthermore, the pipe opening of the transfer pipe away from the flue is sealed to the pipe wall of the flange sleeve using a sealing ring.

[0017] Furthermore, the sampling probe includes a detection tube and a first flange. The detection tube is disposed in the mounting hole. One end of the detection tube is cut with an oblique opening and serves as the detection end, with the oblique opening facing away from the airflow direction. The other end is disposed at the end of the flange sleeve away from the flue for connecting an external detection device. A first flange is sleeved and installed on the outer side of the end for connecting the external detection device. A second flange is correspondingly provided at the end of the flange sleeve away from the flue. The detection tube and the flange sleeve are connected through the first flange and the second flange.

[0018] Furthermore, it also includes a probe support ring, which includes a semi-arc upper probe support ring and a semi-arc lower probe support ring. The mounting channel is a circular channel, and the inner diameter of the mounting channel is larger than the outer diameter of the detection tube. The upper probe support ring and the lower probe support ring are used to symmetrically engage between the detection tube and the mounting channel, and are located on the upper and lower sides of the detection tube.

[0019] The beneficial effects of this utility model are:

[0020] This invention, through its structure consisting of a transfer pipe, sleeve, flange sleeve, and sampling probe, allows for direct, sealed installation of the device on the side wall of the flue using the transfer pipe. The sleeve and flange sleeve support and install the sampling probe, providing limiting and protection to prevent direct dust erosion and extend its service life. A sleeve support frame within the flue facilitates convenient installation and fixation of the sleeve, ensuring device stability. The sampling probe's detection end, located inside the flue, is connected to external detection equipment for real-time flue monitoring. In this design, sampling probes of varying lengths can be inserted from any side of any section of the flue as needed, eliminating the need for opening holes on both sides of the flue, reducing platform installation costs. It also solves the problem that some denitrification flue zonal measurements can only be performed from one side, leading to compromised measurement accuracy, thus lowering detection costs. Furthermore, by installing multiple devices at different locations on the flue as needed, single-sided multi-point sampling or multi-sided sampling can be achieved. The sampling probe is designed to be pluggable, which facilitates regular inspection or replacement, and the sampling probe can be disassembled even during the furnace start-up process.

[0021] This invention utilizes a star-shaped sleeve support structure to reduce vibration caused by excessive flow velocity, preventing the sampling probe from becoming loose due to vibration. The spacing between the devices allows for sufficient deformation space during thermal expansion and contraction. The beveled end serves as the detection end of the sampling probe, facing away from the airflow direction, utilizing gas inertia to reduce the amount of particulate matter drawn into the sampling probe. The probe support ring prevents the detection tube from becoming too long and prone to displacement. Attached Figure Description

[0022] Figure 1 This is an overall structural cross-sectional view of a sampling probe support structure proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the casing support frame of a sampling probe support structure proposed in this utility model;

[0024] Figure 3 This is a schematic diagram of the sampling probe support structure proposed in this utility model;

[0025] Figure 4 This is a schematic diagram of the probe support ring of a sampling probe support structure proposed in this utility model.

[0026] Reference numerals: 1-1, transfer pipe, 1-2, sleeve, 1-3, sleeve support frame, 1-4, sampling probe, 1-5, probe support ring, 1-6, flue, 1-7, upper support channel steel, 2-1, lower support channel steel, 2-2, diagonal brace channel steel, 2-3, detection pipe, 3-1, first flange, 3-2, upper support ring of probe, 4-1, lower support ring of probe. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] As attached Figure 1 As shown, a sampling probe support structure according to an embodiment of this utility model includes a sleeve support frame 1-4, a transition pipe 1-1, a sleeve 1-3, a flange sleeve 1-2, and a sampling probe 1-5. The transition pipe 1-1 is vertically inserted into the side wall of the flue 1-7 and extends into the interior of the flue 1-7. The sleeve 1-3 is inserted into the interior of the flue 1-7 through the pipe of the transition pipe 1-1 and is limited and fixed by the sleeve support frame 1-4 set in the flue 1-7. The flange sleeve... 1-2 is sealed and inserted at the pipe opening of the transfer pipe 1-1 away from the flue 1-7, and a through and connected installation channel is provided between the flange sleeve 1-2 and the sleeve 1-3. The detection end of the sampling probe 1-5 is inserted into the installation channel from the end of the flange sleeve 1-2 away from the flue 1-7 and passes through to the detection end, exiting the sleeve 1-3 and located inside the flue 1-7. The other end of the sampling probe 1-5 is located at the end of the flange sleeve 1-2 away from the flue 1-7 and is connected to the external detection equipment.

[0029] This utility model, through the structural arrangement of the adapter pipe 1-1, sleeve 1-3, flange sleeve 1-2, and sampling probe 1-5, allows the device to be directly and sealed on the side wall of flue 1-7 using the adapter pipe 1-1. The sleeve 1-3 and flange sleeve 1-2 support and install the sampling probe 1-5, and limit and protect the sampling probe 1-5 to prevent dust from directly eroding it, thus extending its service life. The sleeve support frame 1-4, located inside the flue 1-7, facilitates the installation and fixation of the sleeve 1-3, ensuring the stability of the device. The detection end of the sampling probe 1-5, located inside the flue 1-7, can be connected to external detection equipment for real-time detection of the flue 1-7. In this solution, sampling probes 1-5 of varying lengths can be inserted from any side of any section of flue 1-7 as needed, eliminating the need to drill holes on both sides of flue 1-4, thus reducing platform installation costs. This solution also addresses the issue that some denitrification flue section measurements can only be performed from one side, leading to compromised measurement accuracy. Furthermore, by installing multiple probes at different locations on flue 1-7 as needed, single-sided multi-point sampling or multi-sided sampling can be achieved. The sampling probes 1-5 are designed to be removable, facilitating periodic inspection or replacement, and can be disassembled even during furnace start-up.

[0030] In the above scheme, the transfer pipe 1-1 can be welded to the side wall of the rectangular or circular flue 1-7, the aforementioned sleeve support frame 1-4 can be connected to the inner crossbeam of the flue 1-7, and the aforementioned sleeve 1-3 and flange sleeve 1-2 are all embedded in the transfer pipe 1-1, and the three are aligned on the same axis. Furthermore, during use, a long sampling probe 1-5 can be inserted from one side of the flue 1-7 as needed to measure the pollutant concentration at a more distant point within the flue.

[0031] As attached Figure 2 As shown, in another specific embodiment based on the above, the sleeve support frame 1-4 includes an upper support channel steel 2-1, a lower support channel steel 2-2, and a middle channel steel. The upper support channel steel 2-1 and the lower support channel steel 2-2 are arranged in parallel, and the middle channel steel is vertically connected between the upper support channel steel 2-1 and the lower support channel steel 2-2. The upper support channel steel 2-1 is parallel to the sleeve 1-3 and installed inside the flue 1-7. The lower support channel steel 2-2 is used to fit and fix to the side wall of the sleeve 1-3. The upper support channel steel 2-1 can be welded to the crossbeam inside the flue 1-7. In this scheme, a longer sleeve 1-3 requires at least two sleeve support frames 1-4 for support connection to reduce the vibration caused by excessive flow velocity in the flue 1-7.

[0032] In this design, the sleeve 1-3 and the lower support channel steel 2-2 are fixedly connected by at least two staggered industrial clamps. This facilitates the assembly and disassembly of the sleeve 1-3, and the small contact area between the sleeve 1-3 and the lower support channel steel 2-2 also facilitates the periodic disassembly and maintenance of the sleeve 1-3. Alternatively, the sleeve 1-3 and the lower support channel steel 2-2 can be welded together to increase the stability of the device.

[0033] The casing support frame 1-4 also includes diagonal bracing channel steels 2-3. A middle channel steel is vertically connected between the upper support channel steel 2-1 and the lower support channel steel 2-2, and is located in the middle position. An oblique bracing channel steel 2-3 is connected to each side of the middle channel steel on the upper support channel steel 2-1, and an oblique bracing channel steel 2-3 is connected to each side of the middle channel steel on the lower support channel steel 2-2. This star-shaped casing support frame 1-4 structure can reduce vibration caused by excessive flow velocity and prevent vibration from causing the sampling probe 1-5 to loosen.

[0034] In another specific embodiment based on the above, there is a gap between the pipe wall of sleeve 1-3 inside the transfer pipe 1-1 and the inner wall of transfer pipe 1-1. There is also a gap between the end of flange sleeve 1-2 inside the transfer pipe 1-1 and the end of sleeve 1-3. Furthermore, there is a gap between the pipe wall of flange sleeve 1-2 inside the transfer pipe 1-1 and the inner wall of transfer pipe 1-1, and the pipe opening of transfer pipe 1-1 away from flue 1-7 is sealed to the pipe wall of flange sleeve 1-2. Thus, by setting the spacing between the devices, a certain deformation space can be allowed during thermal expansion and contraction.

[0035] In this design, the pipe opening of the transfer pipe 1-1 furthest from the flue 1-7 is sealed to the pipe wall of the flange sleeve 1-2 using a sealing ring. Alternatively, the pipe opening of the transfer pipe 1-1 furthest from the flue 1-7 can be fully welded to the pipe wall of the flange sleeve 1-2 for sealing. This provides support and prevents structural deformation of the sleeve 1-3 caused by thermal expansion and contraction during boiler start-up and shutdown.

[0036] As attached Figure 3 As shown, in another specific embodiment based on the above, the sampling probe 1-5 includes a detection tube 3-1 and a first flange 3-2. The detection tube 3-1 is disposed in the mounting hole. One end of the detection tube 3-1 is cut with a bevel and serves as the detection end, with the bevel facing away from the airflow direction. The other end is disposed at the end of the flange sleeve 1-2 away from the flue 1-7 for connecting an external detection device. The end for connecting the external detection device is fitted with a first flange 3-2 welded to the outside. The end of the flange sleeve 1-2 away from the flue 1-7 is provided with a second flange. The detection tube 3-1 and the flange sleeve 1-2 are connected through the first flange 3-2 and the second flange.

[0037] Therefore, the end with the bevel can be used as the detection end, and the bevel faces away from the airflow direction. The inertia of the gas can be used to reduce the amount of particulate matter drawn into the sampling probe 1-5. The connection between the detection tube 3-1 and the flange sleeve 1-2 can be easily made through the setting of the first flange 3-2 and the second flange, and the stability of the installation and use of the detection tube 3-1 can be ensured.

[0038] As attached Figure 4 As shown, in another specific embodiment based on the above, a probe support ring 1-6 is also included. The probe support ring 1-6 includes a semi-arc upper probe support ring 4-1 and a semi-arc lower probe support ring 4-2. The mounting channel is a circular channel, and the inner diameter of the mounting channel is larger than the outer diameter of the detection tube 3-1. The upper probe support ring 4-1 and the lower probe support ring 4-2 are used to symmetrically snap between the detection tube 3-1 and the mounting channel, and are located on the upper and lower sides of the detection tube 3-1. The upper probe support ring 4-1 and the lower probe support ring 4-2 are connected and fixed with 316 stainless steel M6 screws, and a gap of 2-3 mm is left between the upper probe support ring 4-1 and the lower probe support ring 4-2.

[0039] Therefore, the probe support rings 1-6 prevent the detection tube 3-1 from becoming too long and easily displaced. In this design, the upper probe support ring 4-1 and the semi-circular lower probe support ring 4-2 are symmetrically structured and made of 316L stainless steel. The inner diameters of the upper probe support ring 4-1 and the semi-circular lower probe support ring 4-2 match the outer diameter of the detection tube 3-1. Specifically, during use, a set of probe support rings 1-6 can be fixed at 1.5-meter intervals on the outside of the detection tube 3-1, which serves both as support and facilitates periodic disassembly and maintenance of the sampling probe 1-5.

[0040] In this scheme, the sleeve 1-3 is preferably made of 316L stainless steel. The detection tube 3-1 and the first flange 3-2 are both made of 316L stainless steel to ensure temperature resistance, corrosion resistance, and erosion resistance, and to extend the service life of the sleeve. Specifically, the stainless steel tube 3-1 can extend 20cm beyond the sleeve 1-3 to ensure that representative flue gas can be collected.

[0041] This utility model device can be used for multi-point online monitoring of denitrification in coal-fired power plants. It is suitable for single-sided multi-point sampling or multi-sided sampling in situations with high dust, high corrosiveness, and high flow velocity at the denitrification outlet. In particular, it can ensure that representative flue gas is collected from the flue even when the flow field is uneven or a platform cannot be built on one side of the flue, thus providing representative nitrogen oxide concentrations for the denitrification process of coal-fired power plants.

[0042] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in this utility model are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0043] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A sampling probe support structure, characterized in that: The system includes a casing support frame (1-4), a transition pipe (1-1), a casing (1-3), a flange sleeve (1-2), and a sampling probe (1-5). The transition pipe (1-1) is vertically inserted into the side wall of the flue (1-7) and extends into the interior of the flue (1-7). The casing (1-3) is inserted into the interior of the flue (1-7) through the pipe of the transition pipe (1-1) and is limited and fixed by the casing support frame (1-4) located in the flue (1-7). The flange sleeve (1-2) is sealed and inserted into the flue. The transfer pipe (1-1) is located at the pipe opening away from the flue (1-7), and a through and connected installation channel is provided between the flange sleeve (1-2) and the sleeve (1-3). The detection end of the sampling probe (1-5) is inserted into the installation channel from the end of the flange sleeve (1-2) away from the flue (1-7) and passes through to the detection end, exiting the sleeve (1-3) and located inside the flue (1-7). The other end of the sampling probe (1-5) is located at the end of the flange sleeve (1-2) away from the flue (1-7) and is connected to an external detection device.

2. The sampling probe support structure according to claim 1, characterized in that: The sleeve support frame (1-4) includes an upper support channel steel (2-1), a lower support channel steel (2-2), and a middle channel steel. The upper support channel steel (2-1) and the lower support channel steel (2-2) are arranged in parallel, and the middle channel steel is vertically connected between the upper support channel steel (2-1) and the lower support channel steel (2-2). The upper support channel steel (2-1) is parallel to the sleeve (1-3) and installed inside the flue (1-7). The lower support channel steel (2-2) is used to fit and fix to the side wall of the sleeve (1-3).

3. The sampling probe support structure according to claim 2, characterized in that: The sleeve (1-3) and the lower support channel steel (2-2) are fixedly connected by at least two staggered industrial clamps.

4. The sampling probe support structure according to claim 2, characterized in that: The sleeve support frame (1-4) also includes diagonal bracing channel steel (2-3). The middle channel steel is vertically connected between the upper support channel steel (2-1) and the lower support channel steel (2-2) and is located in the middle position. On the upper support channel steel (2-1), there is a diagonal bracing channel steel (2-3) connected to the middle channel steel on both sides. On the lower support channel steel (2-2), there is a diagonal bracing channel steel (2-3) connected to the middle channel steel on both sides.

5. The sampling probe support structure according to claim 1, characterized in that: There is a gap between the sleeve (1-3) located inside the adapter pipe (1-1) and the inner wall of the adapter pipe (1-1).

6. The sampling probe support structure according to claim 1, characterized in that: There is a gap between the end of the flange sleeve (1-2) located inside the adapter pipe (1-1) and the end of the sleeve (1-3).

7. The sampling probe support structure according to claim 1, characterized in that: There is a gap between the pipe wall of the flange sleeve (1-2) located inside the transfer pipe (1-1) and the inner wall of the transfer pipe (1-1), and the pipe opening of the transfer pipe (1-1) away from the flue (1-7) is sealed to the pipe wall of the flange sleeve (1-2).

8. The sampling probe support structure according to claim 7, characterized in that: The pipe opening of the transfer pipe (1-1) away from the flue (1-7) is sealed with the pipe wall of the flange sleeve (1-2) using a sealing ring.

9. A sampling probe support structure according to claim 1, characterized in that: The sampling probe (1-5) includes a detection tube (3-1) and a first flange (3-2). The detection tube (3-1) is disposed in the mounting hole. One end of the detection tube (3-1) is cut with an oblique opening and serves as the detection end, with the oblique opening facing away from the airflow direction. The other end is disposed at the end of the flange sleeve (1-2) away from the flue (1-7) for connecting an external detection device. The first flange (3-2) is sleeved and installed on the outer side of the end for connecting the external detection device. A second flange is correspondingly provided at the end of the flange sleeve (1-2) away from the flue (1-7). The detection tube (3-1) and the flange sleeve (1-2) are connected through the first flange (3-2) and the second flange.

10. A sampling probe support structure according to claim 9, characterized in that: It also includes a probe support ring (1-6), which includes a semi-arc upper probe support ring (4-1) and a semi-arc lower probe support ring (4-2). The mounting channel is a circular channel, and the inner diameter of the mounting channel is larger than the outer diameter of the detection tube (3-1). The upper probe support ring (4-1) and the lower probe support ring (4-2) are used to symmetrically engage between the detection tube (3-1) and the mounting channel, and are located on the upper and lower sides of the detection tube (3-1).

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