Boiler pulverized coal sampler

Abstract

The utility model relates to a boiler pulverized coal sampler, which is fixed on a primary air pipe cavity of a boiler and comprises a sampling feed pipe shell and a detection pipe shell, a hand valve is mounted in the middle of the sampling feed pipe shell; one end of the detection pipe shell is arranged to be a detection pipe shell connecting end, the other end of the detection pipe shell is arranged to be a closed end, the detection pipe shell connecting end of the detection pipe shell is connected with a sampling feeding pipe shell connecting end flange of the sampling feeding pipe shell, and the interior of the detection pipe shell is communicated with the interior of the sampling feeding pipe shell; a slot is formed in the bottom wall of the detection tube shell, and a pulverized coal sampling box is inserted into the slot. The boiler pulverized coal sampler can sample pulverized coal when the pulverized coal is added into a boiler, and the sampler is fixed on a primary air pipe cavity of the boiler, so that stable contact of pulverized coal flow is ensured, and the sampling accuracy and representativeness are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder sampling, in particular to a boiler coal powder sampler. Background Art

[0002] In boiler combustion systems, pulverized coal (PFC) is the primary fuel, and its quality and stability have a significant impact on the boiler's combustion efficiency and environmental performance. However, in actual operation, the quality and flow of PFC are often affected by a variety of factors, such as changes in coal type, the operating status of the pulverizer, and the mixing of air and PFC. Therefore, regular sampling and testing of PFC in boilers to understand its quality and characteristics is crucial for ensuring stable boiler operation and environmentally friendly emissions.

[0003] Traditional coal powder sampling methods mostly use manual sampling or simple mechanical sampling devices. These methods have many shortcomings. Manual sampling requires workers to enter the boiler site to operate, which is not only labor-intensive and inefficient, but also poses safety risks. At the same time, manual sampling is easily affected by human factors, resulting in inaccurate and non-representative sampling results. Simple mechanical sampling devices often have problems such as fixed sampling positions and limited sampling ranges, which cannot meet the needs of comprehensive and accurate sampling of coal powder. Or the sampling positions of some samplers are not reasonable enough, resulting in the sampling results being easily affected by the local flow characteristics in the pipeline. Some samplers have complex structures and are difficult to maintain, which increases operating costs and safety risks. Some samplers are easily impacted and worn by coal powder particles during the sampling process, resulting in reduced sampling accuracy and life.

[0004] Therefore, it is necessary to improve and optimize the existing boiler pulverized coal sampler to improve its sampling accuracy, stability and reliability. Utility Model Content

[0005] The technical problem to be solved by the utility model is to address the deficiencies of the existing technology and provide a boiler coal powder sampler for sampling coal powder during the period of adding coal powder to the boiler to facilitate subsequent detection.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solutions: the sampler is fixed on the tube cavity of the primary air of the boiler, and the tube cavity of the primary air of the boiler includes a vertical mixing pipe, a pulverized coal pipe and a primary air pipe. The pulverized coal pipe is vertically arranged on the top of the vertical mixing pipe, and the primary air pipe is horizontally arranged on the middle outer wall of the vertical mixing pipe. The boiler pulverized coal sampler includes a sampling feed pipe shell and a detection tube shell;

[0007] One end of the sampling and feeding tube housing is set as the sampling and feeding tube housing welding end, and the other end is set as the sampling and feeding tube housing connecting end. The sampling and feeding tube housing welding end of the sampling and feeding tube housing is welded to the outer wall of the vertical mixing tube. The middle part of the sampling and feeding tube housing is connected with the interior of the vertical mixing tube and faces the primary air duct. A hand valve is installed in the middle part of the sampling and feeding tube housing;

[0008] One end of the detection tube housing is set as the detection tube housing connecting end and the other end is a closed end. The detection tube housing connecting end of the detection tube housing is flange-connected to the sampling feed tube housing. The interior of the detection tube housing is connected to the interior of the sampling feed tube housing. A slot is opened on the bottom wall of the detection tube housing, and a coal powder sampling box is inserted into the slot.

[0009] The technical problem to be solved by the present invention can also be achieved through the following technical solutions: the boiler pulverized coal sampler described above, the top of the pulverized coal sampling box is open-type, so as to receive the pulverized coal blown into the sampler.

[0010] The technical problem to be solved by the present invention can also be achieved through the following technical solutions. In the boiler pulverized coal sampler described above, the sampling feed tube shell portion located between the sampling feed tube shell welding end and the hand valve is arranged in an inclined shape, and the installation height of the sampling feed tube shell welding end is lower than the installation height of the hand valve.

[0011] The technical problem to be solved by the present invention can also be achieved through the following technical solutions. The boiler coal powder sampler described above has a baffle fixed on the inner wall between the detection tube shell connection end and the closed end of the detection tube shell. The side of the baffle facing the detection tube shell connection end is used to contact and block the coal powder, thereby reducing its impact force on the inner wall of the detection tube shell.

[0012] The technical problem to be solved by the present invention can also be achieved through the following technical solution: in the above-mentioned boiler coal powder sampler, the baffle is located directly above the coal powder sampling box.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are:

[0014] (1) The boiler pulverized coal sampler can sample pulverized coal during the boiler pulverized coal addition period. The sampler is fixed on the tube cavity of the boiler primary air, ensuring stable contact with the pulverized coal flow, thereby improving the accuracy and representativeness of the sampling;

[0015] (2) The flange connection between the sampling feed pipe housing and the detection pipe housing makes the sampling process simple and easy to operate. The plug-in design of the coal powder sampling box facilitates the removal and transfer of coal powder samples to the laboratory for subsequent testing and analysis, thereby improving work efficiency.

[0016] (3) The baffle installed inside the detection tube shell can effectively reduce the impact force of coal powder on the inner wall of the detection tube shell, prolonging the service life of the sampler and reducing the loss and pollution of coal powder during the sampling process. In addition, the inclined design of the sampling feed tube shell is conducive to the smooth entry of coal powder into the sampler under the action of gravity, reducing the accumulation and blockage of coal powder in the pipeline. At the same time, this design also facilitates the operation and maintenance of the hand valve.

[0017] (4) The hand valve can be set to quickly close the sampling channel when needed, ensuring the safety of the sampling process. In addition, the flange connection method also facilitates the installation and disassembly of the sampler, providing convenience for the maintenance and replacement of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model after installation;

[0019] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure.

[0020] Figure numerals: 1. vertical mixing pipe; 2. pulverized coal pipe; 3. primary air duct; 4. hopper; 5. fan; 6. sampling and feeding pipe housing; 7. detection tube housing; 8. sampling and feeding pipe housing welding end; 9. sampling and feeding pipe housing connecting end; 10. hand valve; 11. detection tube housing connecting end; 12. closed end; 13. pulverized coal sampling box; 14. baffle. DETAILED DESCRIPTION

[0021] The following further describes the specific technical solutions of the present invention with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and does not constitute a limitation to their rights.

[0022] Example 1, with reference to Figure 1-2 , a boiler pulverized coal sampler, which is fixed on the tube cavity of the boiler primary air. The tube cavity of the boiler primary air includes a vertical mixing pipe 1, a pulverized coal pipe 2 and a primary air pipe 3. The pulverized coal pipe 2 is vertically arranged on the top of the vertical mixing pipe 1. Above the pulverized coal pipe 2 is a hopper 4 in the plant area for adding pulverized coal to the boiler. The bottom end of the pulverized coal pipe 2 is connected to a swirl burner (not shown in the figure). The primary air pipe 3 is horizontally arranged on the middle outer wall of the vertical mixing pipe 1. The end of the primary air pipe 3 is provided with a fan 5. The boiler pulverized coal sampler includes a sampling feed pipe shell 6 and a detection tube shell 7;

[0023] One end of the sampling and feeding tube housing 6 is set as a sampling and feeding tube housing welding end 8, and the other end is set as a sampling and feeding tube housing connecting end 9. The sampling and feeding tube housing 6 is formed into a roughly tubular structure. The sampling and feeding tube housing welding end 8 of the sampling and feeding tube housing 6 is welded to the outer wall of the vertical mixing tube 1. The middle part of the sampling and feeding tube housing 6 is connected to the interior of the vertical mixing tube 1 and is opposite to the primary air duct 3. A hand valve 10 is installed in the middle part of the sampling and feeding tube housing 6. The hand valve 10 can control the on and off of the airflow in the sampling and feeding tube housing 6;

[0024] In order to reduce the impact of the coal powder airflow on the interior of the sampler, the front end of the sampling feed pipe housing 6 is designed to be inclined. In other words, the portion of the sampling feed pipe housing 6 located between the sampling feed pipe housing welding end 8 and the hand valve 10 is inclined. The inclination angle can be selected according to the use requirements. The installation height of the sampling feed pipe housing welding end 8 is lower than the installation height of the hand valve 10.

[0025] One end of the detection tube housing 7 is set as a detection tube housing connection end 11, and the other end is a closed end 12. The detection tube housing connection end 11 of the detection tube housing 7 is flange-connected to the sampling feed tube housing connection end 9 of the sampling feed tube housing 6, and the two are easy to disassemble. The interior of the detection tube housing 7 is connected to the interior of the sampling feed tube housing 6. A slot is provided on the bottom wall of the detection tube housing 7. The slot is a square slot. A coal powder sampling box 13 is inserted into the slot, which forms a roughly square box-shaped structure. The top of the coal powder sampling box 13 is open to receive the coal powder blown into the sampler.

[0026] A baffle 14 is vertically fixed on the inner wall between the detection tube housing connection end 11 and the closed end 12 of the detection tube housing 7. The baffle 14 is formed into a roughly square plate structure. The baffle 14 is located directly above the coal powder sampling box 13. The baffle 14 faces the side of the detection tube housing connection end 11 and is used to contact and block the coal powder, thereby reducing its impact force on the inner wall of the detection tube housing 7.

[0027] (1) Installation and preparation: First, fix the boiler coal powder sampler on the boiler primary air cavity according to the design requirements, ensure that the sampling feed pipe shell welding end 8 is welded to the outer wall of the vertical mixing pipe 1, and the middle part of the sampling feed pipe shell 6 is connected with the inside of the vertical mixing pipe 1 and faces the primary air duct 3, check whether the manual valve 10 is in the closed state to prevent the coal powder airflow from entering the sampler during installation or debugging, connect the detection tube shell connection end 11 of the detection tube shell 7 and the sampling feed pipe shell connection end 9 of the sampling feed pipe shell 6 through a flange, and ensure that the connection is tight and leak-free, and insert the coal powder sampling box 13 into the slot;

[0028] (2) Start sampling: When the boiler primary air system is started, the pulverized coal is added to the vertical mixing pipe 1 from the hopper 4 and mixed with the air flow in the primary air duct 3 to form a pulverized coal airflow. At this time, the manual valve 10 is opened to allow the pulverized coal airflow to enter the sampling feed pipe shell 6. Since the front end of the sampling feed pipe shell 6 is designed to be inclined, the impact force of the pulverized coal airflow will be weakened to a certain extent when entering the sampler, thereby protecting the interior of the sampler from damage. The pulverized coal airflow continues to pass through the sampling feed pipe shell 6 and enters the detection tube shell 7. Under the obstruction of the baffle 14, the direction of the pulverized coal airflow will change, further weakening the impact force on the inner wall of the detection tube shell 7. The pulverized coal particles in the pulverized coal airflow fall into the pulverized coal sampling box 13 under the action of their own weight, thereby realizing the collection operation;

[0029] (3) Sampling completion and testing: When the hand valve 10 is opened for a certain period of time, the hand valve 10 is closed to stop the coal powder airflow from entering the sampler. The flange connection between the detection tube housing 7 and the sampling feed pipe housing 6 is disassembled, and the coal powder sampling box 13 is taken out. The coal powder sample in the coal powder sampling box 13 is sent to the laboratory for testing of indicators such as quality, particle size, and moisture content. Based on the test results, the quality and characteristics of the boiler coal powder are evaluated to provide data support for the stable operation of the boiler and environmental protection emissions.

[0030] (4) Cleaning and maintenance: After completing sampling and testing, clean the inside of the sampler and the coal powder sampling box 13 to ensure that there is no residual coal powder. Check whether the various components of the sampler are intact. If there is any damage or wear, replace or repair it in time. Reinstall the sampler on the pipe cavity of the boiler primary air and prepare for the next sampling.

Claims

1. A boiler pulverized coal sampler, which is fixed to the boiler's primary air lumen. The boiler's primary air lumen includes a vertical mixing pipe, a pulverized coal pipe, and a primary air duct. The pulverized coal pipe is vertically mounted on the top of the vertical mixing pipe, and the primary air duct is horizontally mounted on the middle outer wall of the vertical mixing pipe. The features are: The boiler coal powder sampler comprises a sampling feed pipe shell and a detection tube shell; One end of the sampling and feeding tube housing is set as the sampling and feeding tube housing welding end, and the other end is set as the sampling and feeding tube housing connecting end. The sampling and feeding tube housing welding end of the sampling and feeding tube housing is welded to the outer wall of the vertical mixing tube. The middle part of the sampling and feeding tube housing is connected with the interior of the vertical mixing tube and faces the primary air duct. A hand valve is installed in the middle part of the sampling and feeding tube housing; One end of the detection tube housing is set as the detection tube housing connecting end and the other end is a closed end. The detection tube housing connecting end of the detection tube housing is flange-connected to the sampling feed tube housing. The interior of the detection tube housing is connected to the interior of the sampling feed tube housing. A slot is opened on the bottom wall of the detection tube housing, and a coal powder sampling box is inserted into the slot.

2. The boiler coal powder sampler according to claim 1, characterized in that: The top of the coal powder sampling box is open to receive the coal powder blown into the sampler.

3. The boiler coal powder sampler according to claim 1, characterized in that: The sampling feed pipe shell portion located between the sampling feed pipe shell welding end and the hand valve is arranged in an inclined shape, and the installation height of the sampling feed pipe shell welding end is lower than the installation height of the hand valve.

4. The boiler coal powder sampler according to claim 1, characterized in that: A baffle is fixed on the inner wall of the detection tube housing between the detection tube housing connection end and the closed end. The side of the baffle facing the detection tube housing connection end is used to contact and block the coal powder, thereby reducing its impact force on the inner wall of the detection tube housing.

5. The boiler coal powder sampler according to claim 4, characterized in that: The baffle is located just above the coal powder sampling box.

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