The current coal powder sampling device has problems:

--, jamming

-2、 Unable to shake

-3、 - Powder

-4、 Difficulty in sampling

The use of carbon steel material in coal powder samplers has caused many problems, and some manufacturers still encounter these problems when using coal powder samplers. So it is recommended to use stainless steel material at least ---.

The sampling tube of the coal powder sampler is severely eroded by coal powder, which affects the use of the coal powder sampler. Below we will discuss the shortcomings of various forms of coal powder sampling devices:

-Direct dry coal powder sampling device

The coal powder sampler, sampling tube, and compressed air tube are fixed in the coal powder pipeline, which can withstand the erosion of coal powder for a long time. The initial sampling results during operation are very good, the installation is also simple and convenient, and the operation is also relatively simple. After running for a long time, due to the long-term erosion and wear of the sampling tube and compressed air tube by coal powder, the coal powder cannot be extracted or distorted. (Representing the usage of boilers 1 #, 3 #, 5 # in an expansion project in Xinjiang and a power plant in Jiangsu, this type of coal powder sampler has been in use for less than a year.)

2、 Hand cranked coal powder sampler

The hand cranked coal powder sampler extends the sampling tube into the coal powder pipeline for sampling by shaking the handwheel and the screw drive inside the sampler. After sampling, the sampling tube is rotated counterclockwise by the handwheel to exit the coal powder pipeline to avoid coal powder erosion and prolong the use of the coal powder sampler.

However, the disadvantage is that the transmission mechanism may experience thermal expansion and contraction due to the influence of the heat in the coal powder pipeline, resulting in jamming, the handwheel cannot be shaken, and the sampling ability is lost. Moreover, over time, it will move from the casing to the powder. This coal powder sampler is both large and deadly weak.

Secondly, this type of coal powder sampler extends too long outside the pipeline, taking up space and position, causing safety hazards for on-site workers.

(On behalf of a manufacturer from a certain group in Shandong, all 216 sets have been lost, and coal powder cannot be extracted. The on-site powder production is also quite strict.)

3、 Spiral coal powder sampling device

The manual spiral coal powder sampler is fixed in the coal powder pipeline and rotates to pour out coal powder samples through the impact of coal powder falling and spiral rotation. This type of coal powder sampler - sampling is not representative, and the use of non short - will pass through the shell body - powder, and the transmission machine - will be affected by the thermal expansion and contraction of the coal powder pipeline, making it unable to work properly.

(20 sets of spiral coal powder sampling devices from a company in Shandong, representing the manufacturer, cannot be used normally.)

4、 Hidden arm coal powder sampling device

The design of the hidden arm coal powder sampler overcomes the drawbacks of various coal powder samplers, is simple to install, easy to operate, does not take up space, and is mechanically driven. The sampling tube is hidden outside the coal powder pipeline when not in operation, avoiding the erosion of coal powder and thus extending its use.

Explain the design and structure of a hidden arm coal powder sampling device below:

1. Equipped with a compressed air pressure regulating valve, which adjusts the pressure and flow rate of compressed air (0.05-0.1Mpa) to achieve a sampling rate close to constant speed. The compressed air consumption is about 0.6m3/min

2. The sampling tube adopts a hidden arm type: during sampling, the sampling tube extends across the coal powder pipeline, and is equipped with a sampling, fixed, and constant velocity on the sampling tube. The extracted coal powder is representative. After sampling, the sampling tube is rotated 90 degrees by the operating handle on the outer shell, and is vertically hidden in the outer shell to avoid the erosion of coal powder airflow and achieve the purpose of anti-wear.

3. Easy to operate: Simply open and close the compressed air valve, sampling valve, and blowing valve on the sampling device for each sampling. The entire sampling process only takes 3-4 minutes each time, and at the rated load operating conditions of the coal mill, a coal powder sample of no less than 400 grams can be obtained from each coal powder pipe. The hidden arm coal powder sampling device is compact, and the transmission mechanism is simple. After assembly in the factory, it undergoes cold debugging, ensuring flexible transmission and adjustment, avoiding jamming, and ensuring good contact between sealing components.

4. Prevent blockage of the sampling tube: When the sampling tube is blocked, compressed air can be used for blowing. When blowing, close the blowing valve on the injection pipe, forcing compressed air to enter the cyclone separator through the injection pump to blow the sampling tube, achieving the purpose of preventing blockage.

5. High separation rate: The cyclone separator adopts a different interface and the outlet pipe on the separator is inserted into the coal powder of the separator. This way, when the coal powder enters the separator, secondary separation can be achieved, with a separation rate of ≥ 99.6%. The separated gas is sucked by the jet air extractor and sent into the coal powder pipeline, which does not pollute the working space.

6. Usage - Long: The main components of our factory's hidden arm coal powder sampling device are made of stainless steel, which has sufficient strength and does not bend or deform. The sampling tube can be hidden when not sampling, avoiding the erosion of coal powder. The overall usage can last for more than 10 years.

7. Simple structure, mechanical moving parts and electrical components, maintenance. The operation of the transmission part is flexible, using packing sealing, strict sealing, and coal powder leakage, which does not pollute the working environment.

8. Easy installation: The entire equipment is assembled as a whole at the factory and fixed on the coal powder pipeline. During on-site installation, only corresponding long holes need to be opened on the coal powder pipeline, and the fixed flange of the equipment can be welded to the coal powder pipeline.

(Representative manufacturers include: Linyi factory, Baotou factory, Baosan factory, Xinjiang factory, Liaocheng factory, Zibo factory, Guizhou factory, Yichun factory, Yantai factory, Chifeng factory, etc.)

• Previous：Working status of oil injector and main oil pump
• Next：Fly ash sampler sampling