Mobile multi-point flue gas sampling device for scr flues

Abstract

The utility model belongs to the flue gas sampling technical field relates to a kind of mobile multipoint flue gas sampling device for SCR flue, including sampling head, sampling tube, installation pipe and multiple locking parts.Sampling head and sampling tube are multiple, and one end of each sampling tube is communicated with a corresponding sampling head, and the other end is used to communicate with flue gas detection element.Multiple sampling tubes are sleeved in installation pipe.Guide structure is arranged on the pipe wall of installation pipe along its axial direction, and sampling head is movably arranged on guide structure, and each locking part is used to fix a corresponding sampling head on guide structure.The mobile multipoint flue gas sampling device for SCR flue of the utility model installs multiple sampling heads and corresponding sampling tube through installation pipe, can simultaneously carry out flue gas sampling to different regions of SCR flue, obtains corresponding flow field distribution, nitrogen oxide concentration distribution situation, and sampling efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas sampling technology, and relates to a mobile multi-point flue gas sampling device for SCR flue. Background Technology

[0002] Flue gas from coal-fired power units mainly contains pollutants such as nitrogen oxides, sulfur oxides, and particulate matter. For nitrogen oxide removal, selective catalytic reduction (SCR) denitrification technology is widely used in large coal-fired power units due to its mature technology and high nitrogen oxide removal efficiency. An SCR reactor is installed within the flue gas duct of the coal-fired power unit to remove nitrogen oxides; this section of the flue gas duct is called the SCR flue gas duct.

[0003] To evaluate the nitrogen oxide removal efficiency in SCR flues, flue gas sampling devices are typically used to sample and analyze the flue gas. Flue gas sampling devices are classified as fixed or mobile, both including a sampling head and a sampling tube connected to the sampling head. The sampling head collects flue gas, and the sampling tube delivers the flue gas to a flue gas detection element outside the flue gas duct to detect the nitrogen oxide concentration in the flue gas, thereby evaluating the nitrogen oxide removal efficiency.

[0004] Due to factors such as the need for coal-fired power units to adjust load according to grid demand, the short and variable distance of SCR flues, and variations in coal type, the flow field and flue gas distribution within the SCR flue are often uneven at different times and in different areas. Therefore, it is necessary to collect data from different areas within the SCR flue to improve measurement accuracy. Existing mobile flue gas sampling devices include a sampling head and a corresponding sampling tube. The sampling tube is extended into the flue to collect data from a specific area. The length of the sampling tube extending into the flue is then adjusted, thereby adjusting the position of the sampling head. After multiple measurements, flue gas samples can be collected from different areas within the flue.

[0005] However, since only one area of ​​flue gas can be sampled at a time, the flue gas measured in each area is not at the same time and cannot truly reflect the distribution of flue gas in different areas at the same time, which reduces the accuracy of the measurement. At the same time, this sampling method is also inefficient. Utility Model Content

[0006] The purpose of this invention is to provide a mobile multi-point flue gas sampling device for SCR flues, in order to solve the technical problems of existing mobile flue gas sampling devices being unable to simultaneously measure the flue gas composition in different regions of the flue cross-section and having low measurement efficiency.

[0007] To achieve the above objectives, the present invention provides a specific technical solution for a mobile multi-point flue gas sampling device for SCR flues as follows: A mobile multi-point flue gas sampling device for SCR flues includes a sampling head, a sampling tube, an installation tube, and multiple locking components. Multiple sampling heads and sampling tubes are provided, with one end of each sampling tube connected to a corresponding sampling head and the other end connected to a flue gas detection element. Multiple sampling tubes are sleeved within the installation tube. A guide structure is provided along the axial direction of the wall of the installation tube, and the sampling head is movably positioned on the guide structure. Each locking component is used to fix a corresponding sampling head to the guide structure.

[0008] Furthermore, the sampling head includes a tube body and an annular plate fixed to the outer wall of the bottom end of the tube body; the locking element is a nut, and the outer wall of the tube body also has a threaded section that mates with the nut; the nut and the annular plate are used to fix the tube body to the mounting tube.

[0009] Furthermore, the guiding structure includes a guide groove and a clearance hole communicating with at least one end of the guide groove; the size of the clearance hole is larger than the diameter of the annular plate, and is used to make way for the annular plate so that the tube body enters the guide groove.

[0010] Furthermore, the mounting tube is formed by an arc-shaped plate and a flat plate, and the clearance hole and the guide groove are provided on the flat plate.

[0011] Furthermore, the end of the sampling tube is provided with an elbow, which is used to connect to the sampling head via a thread.

[0012] Furthermore, the outer wall of the mounting tube is provided with a length scale value along its axial direction.

[0013] Furthermore, the mounting tube includes at least one mounting sub-tube, each mounting sub-tube being connected axially by threads.

[0014] Furthermore, there are two guide structures, which are respectively located on opposite sides of the outer wall of the mounting tube, and multiple sampling heads are respectively located on the two guide structures.

[0015] Furthermore, the mounting tube is made of 316L stainless steel.

[0016] The mobile multi-point flue gas sampling device for SCR flue gas ducts of this invention has the following advantages: Before flue gas sampling, the number of sampling heads and their positions on the installation pipe are determined based on the flue gas sampling requirements of the SCR flue. Next, each sampling tube is installed into the installation pipe and connected to its corresponding sampling head. Then, the sampling head is moved to its corresponding position on the installation pipe and secured with locking devices. Finally, the assembled flue gas sampling device is inserted into the SCR flue to achieve flue gas sampling. Because multiple sampling heads are installed on the installation pipe, flue gas samples from different areas of the SCR flue can be taken simultaneously, facilitating the acquisition of the flow field distribution and flue gas distribution in different areas of the SCR flue at the same time. Furthermore, the position and spacing of the sampling heads on the installation pipe can be adjusted to meet the flue gas sampling requirements of the SCR flue under different operating conditions. Moreover, this flue gas sampling device can obtain the flue gas distribution of multiple different areas in a single sampling, significantly improving sampling efficiency, shortening the on-site sampling time for technicians, and effectively reducing the impact of various factors on sampling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the mobile multi-point flue gas sampling device of this utility model. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a top view of the mounting tube of this utility model; Figure 4 This is a schematic diagram of the mobile multi-point flue gas sampling device of this utility model installed in an SCR flue.

[0018] Figure label: 1. Sampling head; 11. Tube body; 12. Annular plate; 2. Sampling tube; 3. Elbow; 4. Installation tube; 41. Installation sub-tube; 5. Clearance hole; 6. Guide groove; 7. Nut. Detailed Implementation

[0019] The technical solutions of this application will now be described clearly and in detail with reference to the accompanying drawings. In the description of the embodiments of this application, "multiple" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0020] like Figures 1 to 4As shown, this utility model provides a mobile multi-point flue gas sampling device for SCR flues, including a sampling head 1, a sampling tube 2, an installation tube 4, and multiple locking components. There are multiple sampling heads 1 and multiple sampling tubes 2. One end of each sampling tube 2 is connected to a corresponding sampling head 1, and the other end is used to connect to a flue gas detection element. Multiple sampling tubes 2 are sleeved inside the installation tube 4. A guide structure is provided on the wall of the installation tube 4 along its axial direction. The sampling heads 1 are movable on the guide structure, and each locking component is used to fix a corresponding sampling head 1 to the guide structure.

[0021] The working process of the mobile multi-point flue gas sampling device for SCR flue gas duct in this embodiment of the utility model is as follows: First, according to the measurement requirements, select an appropriate number of sampling heads 1 and corresponding sampling tubes 2. Second, install the sampling tubes 2 into the installation tube 4 and connect the sampling tubes 2 and the sampling heads 1. Then, move the sampling heads 1 to a suitable position on the guide structure and fix the sampling heads 1 to the guide structure by locking the locking device. Install multiple sampling heads 1 in sequence. Finally, extend the installed flue gas sampling device into the SCR flue gas duct to sample the flue gas.

[0022] This utility model discloses a mobile multi-point flue gas sampling device. Before sampling, the number of sampling heads 1 and their positions on the installation pipe 4 are determined according to the flue gas sampling requirements of the SCR flue. Next, each sampling pipe 2 is installed into the installation pipe 4 and connected to the corresponding sampling head 1. Then, the sampling head 1 is moved to the corresponding position on the installation pipe 4 and fixed with locking components. Finally, the assembled flue gas sampling device is inserted into the SCR flue to achieve flue gas sampling. By installing multiple sampling heads 1 on the installation pipe 4, flue gas samples from different areas of the SCR flue can be collected simultaneously. This facilitates obtaining the flow field distribution and flue gas distribution in different areas of the SCR flue at the same time. For example, it allows for accurate understanding of the flow field distribution and nitrogen oxide concentration distribution at the SCR flue inlet section, the SCR flue catalytic reaction section, and the SCR flue outlet section. Furthermore, by adjusting the position and spacing of the sampling heads 1 on the installation pipe 4, the device can adapt to the flue gas sampling requirements of the SCR flue under different operating conditions. Furthermore, the flue gas sampling device of this utility model can obtain the flue gas distribution of multiple different areas in a single sampling, which can greatly improve sampling efficiency, shorten the on-site sampling time for technicians, and effectively reduce the impact of various factors on sampling.

[0023] In some embodiments of this invention, the flue gas detection element is a multi-point flue gas analysis system, with one end of each of the multiple sampling tubes 2 located outside the SCR flue connected to this multi-point flue gas analysis system. The multi-point flue gas analysis system can simultaneously and independently analyze the flue gas components collected by multiple sampling heads 1, thereby obtaining the flow field distribution and nitrogen oxide concentration distribution of the SCR flue.

[0024] In some embodiments of this utility model, such as Figure 2 and3 As shown, the sampling head 1 includes a tube body 11 and an annular plate 12 fixed to the outer wall of the bottom end of the tube body 11. The locking element is a nut 7, and the outer wall of the tube body 11 also has a threaded section that mates with the nut 7. The nut 7 and the annular plate 12 are used to fix the tube body 11 to the mounting tube. In this embodiment, the nut 7, in conjunction with the threaded section and the annular plate 12, securely fixes the tube body 11 to the mounting tube, resulting in a more stable installation.

[0025] In some embodiments of this utility model, such as Figure 2 and 3 As shown, the guide structure includes a guide groove 6 and a clearance hole 5 communicating with at least one end of the guide groove 6. The clearance hole 5 is larger than the diameter of the annular plate 12 and is used to make way for the annular plate 12 so that the tube body 11 can enter the guide groove 6.

[0026] In this embodiment, the assembly process of the mobile multi-point flue gas sampling device is as follows: First, one end of the sampling tube 2 is inserted into the mounting tube 4 and moved to the clearance hole 5. The annular plate 12 is inserted through the clearance hole 5, and the tube body 11 is connected to the sampling tube 2. Next, the tube body 11 is inserted into the guide groove 6 and moved along the guide groove 6, while simultaneously moving the sampling tube 2 within the mounting tube 4. The tube body 11 is moved to a suitable position, and then the nut 7 is engaged with the threaded section of the tube body 11 and tightened. The tube walls on both sides of the guide groove 6 are clamped between the nut 7 and the annular plate 12, and the sampling head 1 is also fixed on the mounting tube 4. Finally, the other sampling heads 1 and sampling tubes 2 are fixed in sequence to complete the assembly. It should be noted that when installing the sampling heads 1, they should be installed from farthest to near, that is, the sampling head 1 furthest from the clearance hole 5 should be installed first to prevent interference. This embodiment achieves a secure installation of the sampling head 1 on the mounting tube 4, and the sampling head 1 can be freely adjusted in position on the mounting tube 4 to adapt to different sampling needs. Furthermore, multiple sampling tubes 2 are located inside the installation tube 4. The installation tube 4 provides good support for the sampling tubes 2 and can prevent toxic and harmful gases such as flue gas in the flue from corroding the sampling tubes 2, thus extending their service life.

[0027] In some embodiments of this utility model, such as Figure 2 As shown, the sampling tube 2 has an elbow 3 at its end, which is used to connect to the tube body 11 via threads. In this embodiment, the sampling tube 2 is inserted into the installation tube 4, with the elbow 3 aligned with the clearance hole 5. At this time, the sampling head 1 is inserted into the installation tube 4 through the clearance hole 5 and tightened with the elbow 3 via threads. The elbow 3 facilitates the installation of the sampling head 1.

[0028] In some embodiments of this utility model, the outer wall of the mounting tube 4 is provided with a length scale value along its axial direction. In this embodiment, by setting the length scale value, the installation position and installation spacing of the sampling head 1 can be conveniently displayed, thereby making the installation of the sampling head 1 and sampling requirements more convenient.

[0029] In some embodiments of this utility model, such as Figure 3 As shown, both ends of the guide groove 6 are provided with relief holes 5, and the relief holes 5 are located at the outer end of the mounting tube 4. The relief holes 5 can be semi-circular, circular or square.

[0030] In this embodiment, the clearance hole 5 is located at the end of the mounting tube 4, and the guide groove 6 is between the two clearance holes 5. The sampling head 1 is installed in the guide groove 6, which expands the installation range of the sampling head 1 and thus expands the sampling range. In addition, clearance holes 5 are provided at both ends of the guide groove 6, so that the sampling head 1 can be installed from either end of the mounting tube 4, making the installation more convenient.

[0031] In some embodiments of this utility model, the mounting tube 4 is formed by an arc-shaped plate and a flat plate, and the clearance hole 5 and the guide groove 6 are provided on the flat plate.

[0032] In this embodiment, the mounting tube 4 is a round tube, which can accommodate more sampling tubes 2 to the maximum extent. The flat plate is designed so that when the sampling head 1 is installed, the end face of the nut 7 and the outer wall of the flat plate, and the end face of the annular plate 12 and the inner wall of the flat plate fit more closely, thereby making the installation of the sampling head 1 more secure.

[0033] In some embodiments of this utility model, such as Figure 4 As shown, the mounting pipe 4 includes at least one mounting sub-pipe 41, and each mounting sub-pipe 41 is connected along its axial direction by threads. That is, the mounting pipe 4 is formed by connecting multiple mounting sub-pipes 41 end to end. In this embodiment, different numbers of mounting sub-pipes 41 can be selected and connected end to end to form the mounting pipe 4 according to different sizes of SCR flues, so that it can adapt to SCR flues of different sizes, and can save costs and avoid the cost increase caused by customization. Each mounting sub-pipe 41 has an external thread and an internal thread at both ends.

[0034] In some embodiments of this utility model, such as Figure 1 and Figure 4 As shown, there are two guide structures, which are respectively located on opposite sides of the outer wall of the mounting tube 4, and multiple sampling heads 1 are respectively located on the two guide structures.

[0035] In this embodiment, when sampling the SCR flue, flue gas is typically collected from both the direction of flue gas flow and the direction away from the flow direction. Therefore, in this embodiment, the guide structure and multiple sampling heads 1 are positioned on opposite sides of the outer wall of the mounting pipe 4 to meet the usage requirements. The guide structure is the guide groove 6, and both the guide groove 6 and the clearance hole 5 are located on opposite sides of the outer wall of the mounting pipe 4 for the installation of the sampling heads 1.

[0036] In some embodiments of this invention, the mounting pipe 4 is made of 316L stainless steel. 316L stainless steel has high strength, good corrosion resistance, and good high-temperature resistance, meeting the requirements for use in SCR flues.

[0037] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this utility model.

Claims

1. A mobile multi-point flue gas sampling device for SCR flues, comprising a sampling head and a sampling tube, characterized in that, It also includes an installation tube and multiple locking components; there are multiple sampling heads and multiple sampling tubes, one end of each sampling tube is connected to a corresponding sampling head, and the other end is used to connect to a flue gas detection element; multiple sampling tubes are sleeved inside the installation tube; a guide structure is provided on the wall of the installation tube along its axial direction, the sampling head is movably set on the guide structure, and each locking component is used to fix a corresponding sampling head to the guide structure.

2. The mobile multi-point flue gas sampling device for SCR flues according to claim 1, characterized in that, The sampling head includes a tube body and an annular plate fixed to the outer wall of the bottom end of the tube body; the locking element is a nut, and the outer wall of the tube body also has a threaded section that mates with the nut; the nut and the annular plate are used to fix the tube body to the mounting tube.

3. The mobile multi-point flue gas sampling device for SCR flues according to claim 2, characterized in that, The guiding structure includes a guide groove and a clearance hole communicating with at least one end of the guide groove; the size of the clearance hole is larger than the diameter of the annular plate, and is used to make way for the annular plate so that the tube body enters the guide groove.

4. The mobile multi-point flue gas sampling device for SCR flues according to claim 3, characterized in that, The mounting tube is formed by an arc-shaped plate and a flat plate, and the clearance hole and the guide groove are provided on the flat plate.

5. The mobile multi-point flue gas sampling device for SCR flues according to claim 3, characterized in that, The sampling tube has an elbow at one end, which is used to connect to the tube body via a thread.

6. The mobile multi-point flue gas sampling device for SCR flue gas ducts according to claim 1, characterized in that, The outer wall of the mounting tube is provided with a length scale value along its axial direction.

7. The mobile multi-point flue gas sampling device for SCR flues according to claim 1, characterized in that, The mounting tube includes at least one mounting sub-tube, and each mounting sub-tube is connected by threads along its axial direction.

8. The mobile multi-point flue gas sampling device for SCR flue gas ducts according to claim 1, characterized in that, There are two guide structures, which are respectively located on opposite sides of the outer wall of the mounting tube, and multiple sampling heads are respectively located on the two guide structures.

9. The mobile multi-point flue gas sampling device for SCR flues according to claim 1, characterized in that, The mounting tube is made of 316L stainless steel.

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