Whether or not soot blowing in a soot circulating fluidized bed boiler is a controversial issue. Because ash and wear are a contradiction, since the main contradiction of circulating fluidized bed boilers is wear, it is generally considered that circulating fluidized bed boilers do not require soot blowing. However, a detailed analysis of this issue cannot be generalized. The heating surface in front of the gas-solid separator of the circulating fluidized bed boiler definitely does not require soot blowing. That is, if a high-temperature gas-solid separator is used, the furnace does not need to be sooted. For example, a medium-temperature gas-solid separator is used, and the furnace and the superheater do not need to be soot. If two-stage gas-solid separation with high temperature and medium temperature separation is adopted, the heating surface before the middle temperature separator does not need to be soot. Whether the heating surface after the gas-solid separator needs to be blown should be treated differently. If a high-efficiency gas-solid separator with a separation efficiency of 98% or more is used, the average particle size of the ash in the rear part of the separator is small, which is relatively easy. Ash accumulation, this part of the heated surface needs to be arranged with a soot blower. If the separation efficiency of the gas-solid separator is low, the ash content of the flue gas at the rear of the separator is large, and the particles are relatively coarse, and there is a “self-cleaning†effect when the ash-containing gas stream passes over the heated surface, and this part is heated. There is also only a wear problem and no ashing problem, so there is no need to arrange the soot blower. The slag cooler is an important auxiliary equipment for circulating fluidized bed boilers. It plays an important role in continuous slagging, stable combustion chamber pressure conditions, and automation of slagging system. In the early fluidized bed boilers, there was no slag cooler. It could only rely on regular manpower slagging or hydraulic slag. The operation workload was large, and the steam generated by hydraulic slag caused local thermal pollution. The regular slag discharge caused the pressure conditions in the bed. fluctuation. Therefore, the development and use of a slag cooler is very important for improving the overall performance of a circulating fluidized bed boiler. The slag cooler cools the high temperature ash at about 900 ° C discharged from the furnace with water or wind to about 150 to 250 ° C. The slag cooler mainly includes three kinds of water-cooled spiral slag cooler, water-cooled drum type slag cooler and fluidized bed slag cooler. The principle of the water-cooled spiral slag cooler is to cool and transport the ash through the rotation of the water-cooled shaft and the water-cooled blade, and the water-cooled casing also cools the ash. The principle of the water-cooled drum type slag cooler is to cool and transport the ash through the rotation of the water-cooled cylinder and the action of the wind. The fluidized bed cooler is a weak fluidized bed, which cools the ash by fluidized wind, and the heated fluidized wind can enter the furnace as secondary air, thereby reducing the physical heat loss of the ash of the boiler and improving the ash. Boiler efficiency. For high ash coal, in order to cool a large amount of hot ash in time, the economizer heating surface can be arranged in the fluidized bed slag cooler. The water-cooled spiral slag cooler and the water-cooled drum type slag cooler are small in size and convenient to arrange, and the fluidized bed slag cooler has a large volume, and sometimes there are some difficulties in the boiler arrangement. From the use situation, the wear of the water-cooled spiral slag cooler is serious, the maintenance work is large, and the slag reliability of the fluidized bed slag cooler is sometimes not very good. Relatively speaking, the water-cooled drum type slag cooler has fewer problems, and this type of slag cooler is recommended. However, when burning ash with high ash such as coal gangue or oil shale, it is recommended to use a fluidized bed slag cooler to improve the boiler efficiency. Therefore, the auxiliary equipment of the circulating fluidized bed boiler has a significant impact on its performance. In a sense, the auxiliary equipment of the circulating fluidized bed boiler is as important as the main engine. For a long time, domestic research institutes and manufacturers have carried out in-depth and systematic research and product development work on circulating fluidized bed boiler mainframes, and have achieved many achievements. However, research on auxiliary equipment and product development are not enough. The work is not deep enough and specific, especially in engineering applications, it can be said that it is only in its infancy. (Finish) Tungsten Carbide Roll Rings, also known as hard alloy roller ring, has been widely used in the rolling production of high-speed wire, bar, threaded steel, seamless steel pipes, etc. due to its good wear resistance, high-temperature hardness, heat fatigue resistance, thermal conductivity, and high strength. Tungsten Carbide Sleeve,Tungsten Carbide Roller, Steel Rebar Rolling,Steel Wire Rod Rolling,WC Roller Luoyang Golden Egret Geotools Co., Ltd , https://www.xtcthermalspray.com
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