An on-line sampling device for limestone powder gas pipeline

Abstract

The application provides an on-line sampling device for a limestone powder gas pipeline, relates to the technical field of sampling equipment, and comprises a main pipeline, a detection branch pipeline, a sealing sheet and a sampling cylinder.

Description

Technical Field

[0001] This application relates to the field of sampling equipment technology, and in particular to an online sampling device for limestone powder gas pipelines. Background Technology

[0002] In wet flue gas desulfurization (FGD) systems of coal-fired power plants, limestone powder serves as the core absorbent. Its purity, fineness, and activity are key factors determining desulfurization efficiency, system operational stability, the quality of the byproduct gypsum, and overall economic operation. Therefore, rigorous and representative online sampling and testing of the limestone powder transported to the desulfurization tower via pneumatic conveying pipelines is an indispensable quality control step to ensure environmental compliance, optimize operational control, reduce material consumption, and standardize supplier management. The effective implementation of this quality control step directly depends on the performance and reliability of the sampling device.

[0003] Currently, existing technical solutions for limestone powder gas pipeline sampling mainly fall into two categories. The first category is the simplest direct open sampling method, which involves opening a sampling port on the conveying pipeline and sealing it with a flange blind plate or a plate with a rubber sealing gasket. During sampling, the seal needs to be manually opened, and the instrument is quickly inserted into the positive pressure powder gas flow to capture the sample. This method often requires maintaining a high fluidizing air pressure to overcome powder silo accumulation and ensure powder flowability. The second category uses a complete set of online sampling devices, such as rotary samplers or pneumatic double gate valve sampling systems. These devices automatically capture a small portion of the material from the main process as a sample through mechanical or pneumatic means, achieving a high degree of automation.

[0004] However, all of the aforementioned existing technical solutions have significant drawbacks. The first type of simple sampling method is particularly problematic: when the sampling port is opened, a high-concentration powder gas flow under pressure inside the pipeline will gush out instantly, causing serious dust leakage, polluting the environment and endangering the health of operators; at the same time, under the impact of high-speed airflow, sampling is difficult, the sample representativeness is extremely poor, and it cannot truly reflect the material quality, thus failing to achieve the purpose of quality control. Although the second type of complete online sampling device avoids dust leakage to some extent, it has a complex structure, high purchase cost, and inconvenient installation. Furthermore, because it contains precision mechanical moving parts, it is prone to wear, jamming, or malfunction under harsh dust conditions, resulting in high maintenance costs and long maintenance cycles, making it difficult to widely promote and apply in power plants. Utility Model Content

[0005] To address the inconvenience of online sampling in limestone powder gas pipelines, this application provides an online sampling device for limestone powder gas pipelines.

[0006] The online sampling device for limestone powder gas pipeline provided in this application adopts the following technical solution: An online sampling device for limestone powder gas pipelines, comprising: The main pipeline contains limestone powder. The detection branch pipe is installed on the side wall of the main pipe and communicates with the interior of the main pipe; The sealing strip, made of elastic material, is placed at the end of the detection branch pipe away from the main pipe to seal the detection branch pipe. The sealing strip has a detection cut in the middle that is closed in its natural state. The sampling tube has a sampling port on its side wall near one end. The end of the tube near the sampling port passes through the sealing plate through the detection cut and enters the limestone powder pipe for sampling.

[0007] Furthermore, a connector is provided at the end of the detection branch pipe away from the main pipe, and the sealing plate is detachably connected to the monitoring branch pipe through the connector.

[0008] Furthermore, the connecting component includes a first flange and a second flange. The first flange is fixedly connected to the detection branch pipe, and the second flange is detachably connected to the first flange. The sealing plate is clamped and fixed between the first flange and the second flange.

[0009] Furthermore, the sampling cylinder includes a cylinder body and an end cap, and the end cap is detachably connected to the cylinder body.

[0010] Furthermore, the end of the cylinder furthest from the end cap is configured as a pointed conical section.

[0011] Furthermore, the end cap is provided with a threaded post at one end near the cylinder, the outer peripheral wall of the threaded post is provided with external threads, and the inner wall of the cylinder at one end near the end cap is provided with internal threads. The end cap is threadedly connected to the cylinder through the threaded post.

[0012] Furthermore, a handle is provided on the end cap.

[0013] Furthermore, a limiting boss is provided on the side wall of the end of the cylinder near the end cap. When the limiting boss abuts against the second flange, the sampling port is located inside the main pipe, and a gap is left between the end of the cylinder and the inner wall of the main pipe.

[0014] Furthermore, a limiting nut is fixed on the side of the limiting boss away from the main pipe, and a thread is provided on the side wall of the cylinder, with the limiting nut threadedly connected to the cylinder.

[0015] Furthermore, the threads on the cylinder have notches along the axial direction of the cylinder, and the cylinder has scale lines at the notches.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. By installing a detection branch pipe on the side wall of the main pipeline and fixing an elastic sealing plate at the end of the detection branch pipe, the detection notch in the middle of the elastic sealing plate is in a closed state under normal conditions. When the sampling tube passes through the detection notch into the main pipeline to sample limestone powder, the sealing plate adheres to the peripheral wall of the sampling tube under its own elasticity, achieving a seal during sampling. When the sampling tube is pulled out of the detection notch, the detection notch returns to a closed state under the own elasticity of the sealing plate, achieving a seal during and after sampling. This effectively solves the problem of limestone powder being sprayed out of the detection pipeline during sampling and greatly improves the convenience of online limestone powder sampling. 2. By connecting the end cap to the cylinder with threads and providing a handle on the end cap, it is easy to separate the end cap from the cylinder after sampling, making it convenient to transfer the sample inside the cylinder. 3. By setting a limiting boss on the cylinder, the depth of the sampling cylinder inserted into the main pipeline can be limited, thus avoiding damage to the inner wall of the main pipeline during sampling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0019] Figure 2 This is an exploded structural diagram of Embodiment 1 of this application.

[0020] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0021] Figure 4 This is a cross-sectional view of Embodiment 2 of this application.

[0022] Figure 5 This is a schematic diagram of the sampling tube according to Embodiment 2 of this application.

[0023] Reference numerals: 1. Main pipe; 2. Inspection branch pipe; 3. Sealing plate; 31. Inspection notch; 4. Sampling cylinder; 41. Cylinder body; 411. Sampling port; 412. Conical section; 413. Scale line; 42. End cap; 421. Threaded post; 422. Handle; 5. Connector; 51. First flange; 52. Second flange; 6. Limiting boss; 61. Limiting nut. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] Example 1 See Figure 1 and Figure 2 This embodiment provides an online sampling device for limestone powder gas pipelines, including a main pipeline 1, a detection branch pipe 2, a sealing plate 3, a sampling cylinder 4, and a connector 5.

[0026] The main pipeline 1 is used to transport limestone powder gas flow and is preferably made of carbon steel or stainless steel to ensure wear resistance and corrosion resistance. The inspection branch pipe 2 is set on the side wall of the main pipeline 1 and communicates with the interior of the main pipeline 1. The inspection branch pipe 2 is also made of steel and is fixedly connected to the main pipeline 1 by welding to ensure sealing and structural strength.

[0027] A sealing plate 3 is installed at the end of the detection branch pipe 2 furthest from the main pipe 1. The sealing plate 3 is preferably made of wear-resistant and high-temperature-resistant silicone rubber or fluororubber elastic material, and has a detection notch 31 at its center that is naturally closed. When the sampling tube 4 is inserted, the detection notch 31 fits tightly against the outer wall of the sampling tube 4 under the elastic action of the sealing plate 3, thereby achieving a seal and preventing powder and gas leakage. When the sampling tube 4 is withdrawn, the detection notch 31 automatically restores its original shape to form a seal on the detection branch pipe 2, without affecting the normal operation of the equipment.

[0028] To facilitate the disassembly and replacement of the sealing sheet 3, a connector 5 is provided at the end of the detection branch pipe 2. The connector 5 includes a first flange 51 and a second flange 52. The first flange 51 is fixedly connected to the detection branch pipe 2 by welding, and the second flange 52 is detachably connected to the first flange 51 by bolts. The sealing sheet 3 is clamped and fixed between the first flange 51 and the second flange 52 to ensure reliable sealing and convenient replacement.

[0029] The sampling cylinder 4 includes a cylinder body 41 and an end cap 42, which are detachably connected to the cylinder body 41. It is preferably made of stainless steel to ensure wear resistance and corrosion resistance in a powdery gas environment. The inner wall of the cylinder body 41 near the end cap 42 has internal threads, and the end cap 42 near the cylinder body 41 has a threaded post 421. The outer peripheral wall of the threaded post 421 has external threads. The end cap 42 is threadedly connected to the cylinder body 41 via the threaded post 421, facilitating sample removal and transfer after sampling.

[0030] The end of the cylinder 41 furthest from the end cap 42 is machined into a pointed cone section 412. The pointed cone section 412 can effectively reduce the disturbance to the limestone powder airflow when the sampling cylinder is inserted into the main pipe 1, improve the representativeness of the sample, and facilitate penetration of the detection cut 31 of the sealing sheet 3 to enter the interior of the pipe. A sampling port 411 is opened on the side wall of the end of the cylinder 41 near the pointed cone section. During sampling, the sampling port 411 is inserted into the interior of the main pipe 1 and faces the flow direction of the limestone powder in the main pipe 1, so as to directly capture a representative limestone powder sample.

[0031] The device has a simple structure, good sealing effect, and is easy to operate and maintain. It can effectively prevent limestone powder from leaking out and ensure the representativeness and safety of the sampling.

[0032] Example 2 See Figures 3 to 5 Based on Example 1, this example further optimizes the structure of the sampling device.

[0033] First, a handle 422 is provided on the outside of the end cap 42. The handle 422 is preferably made of metal rod or high-strength engineering plastic and is fixed to the end cap 42 by welding or screws. The handle 422 makes it easy for the operator to hold and rotate the end cap, thereby realizing quick loading and unloading of the sampling cylinder 4 and improving the convenience of operation.

[0034] Secondly, a limiting boss 6 is provided on the outer wall of the end of the cylinder 41 near the end cap 42. When the limiting boss 6 abuts against the second flange 52, the sampling port 411 can be accurately located inside the main pipe 1, and a reasonable gap is maintained between the pointed cone section 412 of the cylinder 41 and the inner wall of the main pipe 1, so as to ensure the representativeness of the sample acquisition and avoid mechanical damage to the inner wall of the main pipe caused by the end of the cylinder 41.

[0035] Furthermore, a limiting nut 61 is provided on the side of the limiting boss 6 away from the main pipe 1. Threads are machined on the outer wall of the cylinder 41, and the limiting nut 61 is connected to the cylinder 41 through the threads, thereby adjusting and locking the insertion depth of the sampling cylinder 4, enhancing the stability and controllability of sampling.

[0036] In addition, a notch is provided axially at the threaded part of the cylinder 41, and a scale line 413 is machined at the notch. The scale line 413 is formed by laser etching or engraving process, which can intuitively show the depth of the sampling cylinder 4 inserted into the main pipe 1, so as to facilitate the operator to make precise control according to different sampling needs.

[0037] In summary, Embodiment 2 not only possesses all the functions of Embodiment 1, but also significantly improves the ease of operation, controllability of insertion depth, and accuracy of sample collection by adding structures such as handle 422, limiting boss 6, limiting nut 61, and scale line 413, thereby further enhancing the practicality and reliability of the online sampling device.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An online sampling device for limestone powder gas pipelines, characterized in that, include: The main pipeline contains limestone powder. The detection branch pipe is installed on the side wall of the main pipe and communicates with the interior of the main pipe; The sealing strip, made of elastic material, is placed at the end of the detection branch pipe away from the main pipe to seal the detection branch pipe. The sealing strip has a detection cut in the middle that is closed in its natural state. The sampling tube has a sampling port on its side wall near one end. The end of the tube near the sampling port passes through the sealing plate through the detection cut and enters the limestone powder pipe for sampling.

2. The online sampling device for limestone powder gas pipeline according to claim 1, characterized in that, The end of the detection branch pipe away from the main pipe is provided with a connector, and the sealing plate is detachably connected to the monitoring branch pipe through the connector.

3. The online sampling device for limestone powder gas pipeline according to claim 2, characterized in that, The connector includes a first flange and a second flange. The first flange is fixedly connected to the detection branch pipe, and the second flange is detachably connected to the first flange. The sealing plate is clamped and fixed between the first flange and the second flange.

4. The online sampling device for limestone powder gas pipeline according to claim 3, characterized in that, The sampling tube includes a tube body and an end cap, and the end cap is detachably connected to the tube body.

5. An online sampling device for limestone powder gas pipelines according to claim 4, characterized in that, The end of the cylinder furthest from the end cap is configured as a pointed conical section.

6. The online sampling device for limestone powder gas pipeline according to claim 5, characterized in that, The end cap is provided with a threaded post at one end near the cylinder, the outer peripheral wall of the threaded post is provided with external threads, and the inner wall of the cylinder at one end near the end cap is provided with internal threads. The end cap is threadedly connected to the cylinder through the threaded post.

7. An online sampling device for limestone powder gas pipelines according to any one of claims 4-6, characterized in that, The end cap is provided with a handle.

8. An online sampling device for limestone powder gas pipelines according to claim 7, characterized in that, A limiting boss is provided on the side wall of the end of the cylinder near the end cap. When the limiting boss abuts against the second flange, the sampling port is located inside the main pipe, and a gap is left between the end of the cylinder and the inner wall of the main pipe.

9. An online sampling device for limestone powder gas pipelines according to claim 8, characterized in that, A limiting nut is fixed on the side of the limiting boss away from the main pipe, and a thread is provided on the side wall of the cylinder, with the limiting nut threadedly connected to the cylinder.

10. An online sampling device for limestone powder gas pipelines according to claim 9, characterized in that, The cylinder has a notch along its axial direction, and the cylinder has a scale line at the notch.

Images