Boiler self-compensation continuous purging and anti-blocking pressure taking solution

Abstract: Boiler self-compensation continuous purging, anti-clogging and pressure taking solution information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. With my country's emphasis on environmental protection, clean combustion has been raised to a very important position. For this reason, fluidized bed boilers are increasingly emerging. Controlling the bed pressure of each part of the fluidized bed is particularly important for safe and economical operation. Due to the high flow rate of flue gas in the furnace of the fluidized bed boiler, the entrainment is large. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the solution of boiler self-compensation continuous purging, anti-blocking and pressure taking. With my country's emphasis on environmental protection, clean combustion has been raised to a very important position. For this reason, fluidized bed boilers are increasingly emerging. Controlling the bed pressure of each part of the fluidized bed is particularly important for safe and economical operation. Due to the high flow rate of flue gas in the furnace chamber of the fluidized bed boiler and a large amount of unburned ember fuel, its concentration, viscosity and particle size range are much larger than those of the fly ash at the furnace outlet of the pulverized coal furnace, which can easily block the instrument sampling pipe.  In order to solve the above problems, the patent inventor of the PFD-1A anti-blocking air pressure sampler, which has been widely used in boilers across the country, based on the original P-type air blowing device, developed for the special requirements of fluidized bed boilers for pressure taking and anti-blocking. A new generation of PFS-1 continuous purging and anti-blocking pressure-taking device was developed.“Y”type sampling head, the instrument sampling tube is not directly connected to the purge gas, and“Y”Larger head diameter (Φ48×3), so the measurement error caused by no compensation is small (<10Pa), but due to“Y”The head is directly larger. To achieve the outlet flow rate required for blocking prevention, the flow rate of the purge gas is bound to be larger and the air consumption is larger. In addition, the bed pressure of some boilers can only be obtained by drilling holes on the fins of the membrane water wall with a width of 20mm, so it is necessary to optimize the PFS-1 type to reduce the gas consumption, and the measurement error is still approximately“O”, and at the same time can be directly welded on the fin. Through the unremitting efforts, careful design, and repeated tests of the original creators, we have developed a small interface pipe diameter, a large outlet wind speed, and a self-compensating ability (the residual error after compensation is approximately“O”), PFS-1B type self-compensating continuous purging and anti-blocking pressure-taking device with small air consumption. The invention has obtained the national patent (patent number: ZL·200420111516.5), and the anti-blocking product produced by Yanqiao Instrument Accessories Factory has been identified by the expert group.  This device consists of a flow control part and a pressure sampling head. The compressed air with the pressure of 0.4～0.6MPa enters the pressure regulating valve, and after decompression and stabilizing, it enters the rotameter, and then is sent to the pressure sampling head. Pressure sampling head is a self-compensating air-pumping sampling head, the lower end is connected to the measured medium, the upper end is connected to the measuring instrument, and the top end is connected to the compressed air. The compressed air from the flow control system is ejected through the lower port of the core tube, and it forms an adjustable jet air extraction compensation system with the tapered tube. Precisely designing and manufacturing parts can make the residual measurement error after compensation approximately as follows:“O”. Even if the purge flow changes in the range of 0 to 3M3/h, no additional adjustment is required, and the residual error after compensation is less than 10Pa (~1mmH2O), which is far less than that of other products. In addition, the compensation element of this device is in the sampling head, so the distance between the sampling head and the flow control element will not affect the compensation effect, while the compensation effect of other products varies with the distance between the device and the sampler (the size of the pipeline resistance). There is even a situation where compensation cannot be made and the compensator needs to be replaced.  We have measured the product of a company in Northeast China and the PFS-1B model. The residual error (mmH2O) after compensation is as follows: Although the purge flow at a certain point generally does not need to be readjusted according to the actual situation, due to the change of the measured medium pressure and The compressed air pressure actually operates within a certain range (such as 0.4 ~ 0.6MPa), both of which will cause flow changes, so the measurement error caused by the change of purge gas flow has to be considered. Obviously, PFS-1B type The device has obvious advantages in this regard.  Of course, the products of a company in Northeast China are still relatively good, but the structure is complicated and the price is a bit expensive. Therefore, the Yanqiao Instrument Accessories Factory used it for comparative testing.“product”Just please keep your eyes open.  The PFS-1B type device has achieved long-term anti-blocking effect and compensation accuracy that satisfied the owners in the fluidized bed boilers of Baiyanghe Power Plant and Shaoguan Steel Plant's own power plant.  Although the PFS-1B type device is developed in response to the special needs of fluidized bed boilers, its excellent anti-blocking effect and precise compensation accuracy can be used in any situation where other anti-blocking sampling methods cannot be used, such as: A few pulverized coal furnace membranes are drilled on the membrane water wall fins (diameter less than 20mm) for the furnace pressure taking point; a few pulverized coal furnace furnace pressure taking holes are close to the sootblower (flue gas humidity is high); conveying high concentration Pipeline pressure taking of powder……Wait.

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