A pulverized coal sampling device for a power plant boiler

Abstract

The utility model provides a kind of power plant boiler coal powder sampling device, it includes support, conveying cavity, motor, rotating shaft, spiral blade, feeding cavity, discharge cavity, buffer screen, guide plate, conveying cavity is obliquely arranged, motor drives the spiral blade on rotating shaft, uniformly distributed promotes coal powder from feeding cavity continuous steady conveying to discharge cavity, discharge cavity is vertically arranged, inside buffer screen extends horizontally with screen hole, buffering coal powder falling speed, prevent particle breakage and fly, while screening too large particle, ensure that sampling particle size consistency.Guide plate is located below screen, both sides cross arrangement, guide coal powder shunt mixing, optimization collection efficiency.Buffer screen and rotating shaft axis form acute angle, enhance buffering and screening effect;It is located at the top of discharge cavity close to conveying cavity side, shield guide plate gap, prevent coal powder leakage, improve sealing property.Improve sampling uniformity, safety and economy, reduce coal powder waste.

Description

Technical Field

[0001] This utility model relates to the technical field of coal powder conveying and sampling equipment for power plants, and in particular to a coal powder sampling device for power plant boilers. Background Technology

[0002] In the operation of power plant boilers, pulverized coal sampling is a crucial step in ensuring combustion efficiency, monitoring coal quality, and optimizing operating parameters. Existing technologies for boiler pulverized coal sampling devices typically employ simple mechanical structures or airflow methods, but these have several shortcomings, leading to poor sample representativeness, low efficiency, and maintenance difficulties. Firstly, traditional sampling devices often use vertical or horizontal pipes for direct sampling. Pulverized coal is prone to blockage during transport, especially when the coal has high moisture content or contains impurities. The screw conveyor or airflow mechanism struggles to maintain continuous and stable operation, causing sampling interruptions or data distortion. Furthermore, existing devices have rudimentary designs in the discharge stage. When pulverized coal enters the collection container from the conveying chamber, the lack of effective buffering and guiding mechanisms results in excessively high flow rates, leading to impact losses and scattering. This not only results in inaccurate sampling but may also pollute the environment.

[0003] Secondly, the existing sampling devices have insufficient screening capabilities, failing to effectively separate large particles or clumps in the coal powder, thus affecting the uniformity of the sampling. Although some devices are equipped with screens, their positions are fixed and the angles are unreasonable, making the screen holes prone to clogging and difficult to clean, resulting in a decrease in screening efficiency after long-term use. Utility Model Content

[0004] In view of this, the technical problem to be solved by this utility model is: how to provide a coal powder sampling device for power plant boilers to solve the technical problems of clogging and coal powder flying in traditional sampling methods.

[0005] To achieve the above objectives, this utility model proposes a coal powder sampling device for power plant boilers, which includes a support, a conveying chamber, a motor, a rotating shaft, a spiral blade, a feeding chamber, a discharging chamber, a buffer screen plate, and a guide plate. The bracket is fixedly connected to the conveying cavity, which is arranged obliquely. The motor is fixedly installed on the top of the conveying cavity. The output end of the motor is connected to the rotating shaft. The two ends of the rotating shaft are rotatably connected to the two ends of the conveying cavity. The rotating shaft is provided with the spiral blades, which are evenly distributed along the axial direction of the rotating shaft. The rotation of the rotating shaft drives the coal powder located in the conveying cavity to be conveyed toward the discharge cavity. The bottom end of the conveying chamber is connected to the feeding chamber, and the other end of the conveying chamber is the discharge chamber. The discharge chamber is arranged in a vertical direction, and the buffer screen plate is arranged inside the discharge chamber. The buffer screen plate is arranged in a horizontal direction and extends toward the axis of the discharge chamber. The buffer screen plate is provided with multiple screen holes. The guide plate is disposed at the outlet of the discharge chamber and below the buffer screen plate. The guide plates are respectively disposed on both sides of the axis of the discharge chamber and extend downward. The guide plates on both sides of the axis of the discharge chamber are spaced apart and arranged crosswise.

[0006] Furthermore, the included angle between the buffer screen plate and the rotation axis of the rotating shaft is an acute angle.

[0007] Furthermore, the buffer screen plate is located at the top of the discharge chamber and is positioned on one side close to the conveying chamber.

[0008] Furthermore, the buffer screen plate vertically blocks the gap formed at the ends of the guide plates located on both sides of the discharge chamber.

[0009] Compared with related technologies, the beneficial effects of the pulverized coal sampling device for power plant boilers proposed in this utility model are as follows: This technical solution achieves multiple superior technical effects. It adopts an obliquely set conveying chamber, combined with a motor-driven rotating shaft and evenly distributed spiral blades, to ensure that pulverized coal is continuously and smoothly conveyed from the feeding chamber to the discharge chamber. The axial uniform distribution of the spiral blades ensures the conveying stability and reduces fluctuations. It is particularly suitable for high-concentration pulverized coal environments and prevents blockage.

[0010] The discharge chamber is vertically positioned and contains a buffer sieve plate that extends horizontally and has multiple sieve holes to buffer and screen the falling coal powder. The buffering effect slows down the falling coal powder, preventing particle breakage or scattering due to high-speed impact and reducing coal powder loss; the screening function filters out excessively large particles, ensuring the consistency of particle size in the sample and improving sampling accuracy. Guide plates are located at the discharge chamber outlet, below the buffer sieve plate, and are arranged crosswise on both sides to guide the coal powder flow and mixing, preventing accumulation or scattering at the outlet, further optimizing sample representativeness and collection efficiency.

[0011] The buffer screen plate forms an acute angle with the axis of rotation of the rotating shaft, enhancing the synergistic effect between the screen plate and the coal powder flow, and improving the buffering effect and screening accuracy. The screen plate is located at the top of the discharge chamber near the conveying chamber and blocks the gap formed by the end of the guide plate in the vertical direction, effectively preventing coal powder leakage, improving the sealing performance of the device, and reducing external interference and losses during the sampling process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a coal powder sampling device for a power plant boiler according to an embodiment of the present invention. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Please see Figure 1 As shown, this utility model proposes a coal powder sampling device for power plant boilers, which includes a support 11, a conveying chamber 12, a motor 21, a rotating shaft 22, a spiral blade 23, a feeding chamber 13, a discharge chamber 14, a buffer screen plate 31, and a guide plate 32.

[0015] The bracket 11 is fixedly connected to the conveying chamber 12, which is arranged obliquely. The motor 21 is fixedly installed on the top of the conveying chamber 12. The output end of the motor 21 is connected to the rotating shaft 22. The two ends of the rotating shaft 22 are rotatably connected to the two ends of the conveying chamber 12. The rotating shaft 22 is provided with a spiral blade 23, which is evenly distributed along the axial direction of the rotating shaft 22. The rotation of the rotating shaft 22 drives the coal powder located in the conveying chamber 12 to be conveyed toward the discharge chamber 14.

[0016] The output end of the motor 21 is connected to the rotating shaft 22, ensuring that power is efficiently transmitted to the rotating shaft 22 to drive its rotation. The two ends of the rotating shaft 22 are respectively rotatably connected to the two ends of the conveying cavity 12, ensuring the balance and stability of the rotating shaft 22 when rotating at high speed.

[0017] The spiral blades 23 on the rotating shaft 22 are evenly distributed along the axial direction of the rotating shaft 22. This configuration allows the coal powder to be continuously and evenly pushed in the conveying chamber 12, avoiding the problems of local blockage or uneven conveying, thereby ensuring the consistency and representativeness of the sampling.

[0018] By rotating the shaft 22, the spiral blade 23 drives the coal powder to be conveyed toward the discharge chamber 14, realizing the controllable and automated transfer of coal powder, and providing a stable material flow for subsequent buffering and screening processes.

[0019] One end of the bottom of the conveying chamber 12 is connected to the feeding chamber 13, and the other end of the conveying chamber 12 is provided with the discharge chamber 14. The discharge chamber 14 is arranged in a vertical direction, and a buffer screen plate 31 is provided inside the discharge chamber 14. The buffer screen plate 31 is arranged in a horizontal direction and extends toward the axis of the discharge chamber 14. Multiple screen holes are provided on the buffer screen plate 31.

[0020] A discharge chamber 14 is provided at the other end of the conveying chamber 12, which realizes the seamless transfer of coal powder from the conveying chamber 12 to the discharge chamber 14, ensuring the continuity and efficiency of the entire sampling process. The discharge chamber 14 is set in the vertical direction, making full use of gravity, so that the coal powder falls naturally when discharged, reducing the need for external driving force, thereby achieving further buffering and screening.

[0021] A buffer screen plate 31 is provided inside the discharge chamber 14. The buffer screen plate 31 is arranged in the horizontal direction and extends towards the axis of the discharge chamber 14, which effectively increases the screening area, ensures that the coal powder is evenly distributed and passes through the screen plate, and avoids local accumulation or blockage problems.

[0022] Multiple sieve holes are provided on the buffer sieve plate 31. The purpose of this is to separate the coal powder by particle size, allowing fine coal powder that meets the sampling requirements to pass through, while larger particles are intercepted, thereby improving the accuracy and representativeness of the sampling.

[0023] The buffer screen plate 31 also plays an important role in buffering, reducing the impact force when coal powder falls, preventing equipment from being damaged by violent collisions, and reducing coal powder splashing, thus maintaining a clean and safe operating environment.

[0024] This allows for a smooth transition of pulverized coal during conveying, buffering, and screening, improving the overall performance and reliability of the device. By optimizing the flow path and screening effect, the device can achieve efficient and accurate pulverized coal sampling under the harsh conditions of power plant boilers.

[0025] The guide plate 32 is located at the outlet of the discharge chamber 14 and below the buffer screen plate 31. The guide plates 32 are respectively located on both sides of the axis of the discharge chamber 14. The guide plates 32 extend downwards and are arranged at intervals and cross each other on both sides of the axis of the discharge chamber 14.

[0026] The guide plates 32 are respectively set on both sides of the axis of the discharge chamber 14. This symmetrical layout helps to balance the distribution of coal powder, prevents uneven flow or local blockage, improves the uniformity and representativeness of sampling, and enhances the stability of the structure.

[0027] The guide plates 32 located on both sides of the axis of the discharge chamber 14 are arranged at intervals and cross each other. This configuration creates a staggered guiding effect, further disperses the coal powder flow, reduces the impact force, and prevents the coal powder from accumulating or forming eddies at the outlet, thereby ensuring a continuous and smooth discharge process.

[0028] Furthermore, the included angle between the buffer screen plate 31 and the rotation axis of the rotating shaft 22 is an acute angle. The buffer screen plate 31 is located at the top of the discharge cavity 14 and is set on one side close to the conveying cavity 12. The buffer screen plate 31 blocks the gap formed at the end of the guide plates 32 located on both sides of the discharge cavity 14 in the vertical direction.

[0029] The angle formed between the buffer screen plate 31 and the rotation axis of the rotating shaft 22 is an acute angle. This design aims to optimize the flow path of pulverized coal as it enters the discharge chamber 14 from the conveying chamber 12, allowing the pulverized coal to fall naturally onto the surface of the buffer screen plate 31 at an inclined angle, thereby reducing direct impact and promoting uniform distribution of the pulverized coal. By setting an acute angle, the buffer screen plate 31 can more effectively guide the pulverized coal to the screen hole area, avoiding local accumulation or blockage.

[0030] The buffer screen plate 31 is located at the top of the discharge chamber 14 and is set on one side close to the conveying chamber 12. This arrangement allows the coal powder to be received by the buffer screen plate 31 in a timely manner after being discharged from the conveying chamber 12, and to be pushed and moved along the buffer screen plate 31. This is beneficial to the smooth progress of the particle size separation process and prevents the coal powder from accumulating at the top of the discharge chamber 14, thereby maintaining the continuous operation stability of the device.

[0031] The buffer screen plate 31 vertically blocks the gaps formed at the ends of the guide plates 32 located on both sides of the discharge chamber 14. By blocking the gaps at the ends of the guide plates 32, the buffer screen plate 31 effectively prevents coal powder from leaking or splashing from the gaps, ensuring that all coal powder must pass through the screen holes for sieving, thus improving the accuracy and consistency of sampling. At the same time, it reduces the possibility of coal powder stagnation at the guide plates 32, avoids cross-flow interference, and allows the coal powder to be smoothly guided to the collection point.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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 this utility model.

Claims

1. A pulverized coal sampling device for power plant boilers, characterized in that, It includes a support frame, conveying chamber, motor, rotating shaft, spiral blade, feeding chamber, discharging chamber, buffer screen plate, and guide plate; The bracket is fixedly connected to the conveying cavity, which is arranged obliquely. The motor is fixedly installed on the top of the conveying cavity. The output end of the motor is connected to the rotating shaft. The two ends of the rotating shaft are rotatably connected to the two ends of the conveying cavity. The rotating shaft is provided with the spiral blades, which are evenly distributed along the axial direction of the rotating shaft. The rotation of the rotating shaft drives the coal powder located in the conveying cavity to be conveyed toward the discharge cavity. The bottom end of the conveying chamber is connected to the feeding chamber, and the other end of the conveying chamber is the discharge chamber. The discharge chamber is arranged in a vertical direction, and the buffer screen plate is arranged inside the discharge chamber. The buffer screen plate is arranged in a horizontal direction and extends toward the axis of the discharge chamber. The buffer screen plate is provided with multiple screen holes. The guide plate is disposed at the outlet of the discharge chamber and below the buffer screen plate. The guide plates are respectively disposed on both sides of the axis of the discharge chamber and extend downward. The guide plates on both sides of the axis of the discharge chamber are spaced apart and arranged crosswise.

2. The pulverized coal sampling device for power plant boilers as described in claim 1, characterized in that, The angle formed between the buffer screen plate and the rotation axis of the rotating shaft is an acute angle.

3. The pulverized coal sampling device for power plant boilers as described in claim 2, characterized in that, The buffer screen plate is located at the top of the discharge chamber and is positioned on one side close to the conveying chamber.

4. The pulverized coal sampling device for power plant boilers as described in claim 3, characterized in that, The buffer screen plate vertically blocks the gap formed at the ends of the guide plates located on both sides of the discharge chamber.

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