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The PFD-1A sampler has also been widely used in furnace pressure measurement. Most plants can also play a good role in preventing plugging. However, some power plants still have plugging, which is due to our field investigation and analysis. The height and pressure point are too close to the sootblowers in the furnace. When the dust is blown, a large amount of steam and ash enters the sampler. At the same time, the sampler is not insulated or has insufficient insulation, and the internal temperature is lower than the dew point, resulting in condensation of steam and moisture. Water, so that the ash can not slip into the natural, but with the role of water and caking, so that the sampler plug, the solution is: First, the sampling point as far as possible away from the sootblower (this point by the design institute and boiler plant It is proposed when signing a technical agreement. In addition, the sampling tube connected to the inlet of the sampler is well insulated and even buried in the furnace wall protection plate. Then please use this type of easy plugging point and flow. PFD 1L type plug-proof sampler designed for measuring the point of bed furnace. There are also individual power plant plugging because the boiler plant is designed with a sampling tube diameter that is too small (requires ≥O40). The sampling tube and horizontal angle are only 300° or even 0° (required ≥60°). The upper part of the sampling hole is the boiler wind beam. It is not possible to lead straight to the sampler at an angle of 60°. Instead, it is led to the anti-clogging sampler with an arc-shaped tube whose angle between the tangent line and horizontal is gradually increased from 0° to 900°. The boiler has no large enough diameter to take pressure. Holes (especially more fluidized bed boilers) can only be cut between the two water wall tubes with a width of about 20mm during installation. The sample tubes are welded and the above boilers have inherent problems. The PFD-1L block-preventing sampler also does not work, because the ash is not blocked in the sampler, but is blocked in the sampling pipe in front of the sampler, so it must be brought to the attention of the boiler plant. 
In recent years, with China’s emphasis on environmental protection, clean combustion has been on the agenda, and fluidized bed boilers are increasingly emerging. Controlling the bed pressure of various fluidized beds is particularly important for safe and economical operation. Due to the high velocity of flue gas in the hearth of the fluidized bed boiler and the large amount of unburned thorium fuel, the concentration range and particle size of the fluidized bed boiler are much larger than those of the flue gas at the outlet of the pulverized coal furnace, and the fluidized bed furnace and the furnace The fuel to be burned at the exit is still in the combustion stage. It has a greater viscosity and can easily clog sample tubes. 
We have adopted the PFD-1A type of exclusive production patented product PFD-1L type plug-proof sampler specially designed for the fluidized bed boiler of Wuxi Shiqiao Instrument Fittings Factory to solve the problem. The advantages are the same as those of PFD1A, but some users prefer to use a continuous purge device. In order to meet the user's requirements, the inventor of the PFD-1A type plug-proof sampler based on the characteristics of fluidized bed boiler measurement medium and pressure fluctuations, combined with the actual use of the instrument pipe diameter and length, transmitter chamber Volume first-hand data, through theoretical calculations, scientific analysis, and trial and error, developed a new generation of PFS-1 continuous blowing devices that fully meet the needs of fluidized bed boilers, still manufactured exclusively by Wuxi Yongqiao Instrument Parts Factory. And successfully applied in the power plant. 
First, when it comes to purging anti-blocking devices, people will think of measurement errors caused by air consumption and purging. It is also the main principle for the development of the device that both the need to prevent clogging of fluidized bed measurements and the minimization of air consumption are required. The design and process of the device have been considered very seriously. Of course, the use of power plants can also be based on individual measurements. The point of pressure fluctuations, including dust concentration, the length of the instrument pipeline, transmitter chamber volume and other factors, the amount of purge gas is properly adjusted so that it can prevent and minimize gas consumption. As for the measurement error, it is also the developer's most concerned issue. The developer first designed a blower that can be compensated. However, through actual testing, the conclusion is that there is no need to compensate because absolutely even the maximum purge flow is caused. The error is also less than 10KPa (1mmH20). For a fluidized boiler bed pressure of 5-6Kpa, the relative error is only 0î€2% or less, so it is not necessary at all, which increases system complexity and costs a lot of time to compensate. 
2. The general application of the blocking-proof and velocity-measuring elements of dust-containing wind velocity measurement in our country's power plants was after the 1980s, due to the velocity measuring elements (wings, venturi tubes, flute tubes, back-to-back tubes, and argus tube) When the full pressure port meets the air flow, the dust in the gas will drive straight into the full pressure port with a very small aperture. At the same time, due to the friction between the gas and dust and the speed measuring element, static electricity is generated, so that the dust adheres to the full pressure and negative pressure. Pressure port, so even if the measurement of general unfiltered air (such as hot air after the rotary air preheater) speed measuring element will be blocked for a long time, if the measurement of gas powder mixture (such as the middle speed mill outlet, to the powder machine outlet The velocity measuring elements, such as primary air pressure, are more likely to be clogged. This blockage occurs inside the velocity measuring element and can only be resolved by means of a timed purge of compressed air. 
The patented PFC-1 automatic timing purging device exclusively produced by Wuxi Shiqiao Instrument Fittings Factory is specifically developed to solve the jamming of speed measuring elements. In order to ensure that the instrument is running, it avoids the leakage of compressed air into the measurement system and affects the measurement accuracy or blowing. Leakage into the meter while scanning damages the meter. At the same time, in order to minimize the impact on the operation during the purge, the device can hold the pressure measurement port of the measurement instrument when purging, so that the meter still displays (or outputs) the instantaneous wind speed measurement before purging. Value, the actual measured value is displayed (output) after the purge is completed. In addition, there are special considerations in improving the purging effect to increase the service life of the valve of the electronically controlled valve, and in connection with the main control room, etc. This technology has obtained the national technical patent right, and in order to improve the reliability of component selection, The service life, electronic control valve and air control valve are selected by the world's largest manufacturers of brand-name products.
1. Anti-blocking of wind pressure measurement with dust In the 1950s, there was a problem of dust-containing wind pressure measurement and anti-clogging. At that time, a series of "funnel" strings were made by the installer at the site. Sampler, but the effect is not good, often blocked. In the 1970s, some 300MW units from Western countries were introduced into China, and some provided air blowing and anti-blocking devices. For a time, the design institutes moved in a hurry. In the engineering design, domestically-made imitation blowers were used, but they did not last long. "It's not always good. After our experiments, because its blow flow is too small (l/min), there is almost no purge, and the plugging point is still blocked. Since the 1980s, it has been gradually replaced by the patented product PFD-lA anti-blocking air pressure sampler exclusively produced by Wuqiao Yongqiao Instrument Fittings Factory. The reason why this product can replace "foreign goods" is to use it first, which can serve the purpose of never blocking. Secondly, it is simple in construction and cheap in price. Furthermore, it does not require compressed air, does not consume energy, does not require maintenance, and does not require The installation of the gas source pipeline is simple to install, and the workload is small without any measurement error. For more than two decades, it has been widely used on hundreds of boiler units in China and also exported to South and Southeast Asia. It is still the best product for preventing plugging. 