Fly ash treatment in gasifiers
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I would like to know if it is possible to mix the dust removed from the gasification furnace with fuel and use this mixture as fuel in a circulating fluidized bed boiler for combustion, in order to recover heat. However, the fly ash particles are too fine and are immediately blown away from the furnace. Is there any way to prolong the time that the fly ash stays inside the furnace? A newcomer seeking advice and guidance.
Don’t you mix the powder with coal and then send it into the furnace? If that’s the case, as long as it’s mixed well, it shouldn’t be blown away right away
This post was last edited by pzhmotor on 2017-8-31 at 11:24. It is recommended that the original poster read books and papers on the design and principles of circulating fluidized bed boilers, as well as industry standards. There is some information on this topic in the forum; it’s recommended to download it and study it! \"Design and Calculation of Circulating Fluidized Bed Boilers\" is relatively easy to read and covers a comprehensive range of topics. Types, design, and principles of returners ； Some knowledge about combustion and heat transfer ； D50，D90 ； Cycling rate ； Calculations of thermal efficiency and related topics. PS: It was one of the introductory books on CFB that I bought after changing careers; it provided theoretical guidance for the subsequent modification of the ash return system in small CFB boilers. \"Theoretical Design and Operation of Circulating Fluidized Bed Boilers\" is a quite classic book with comprehensive content. \"Collection of Technical Papers on Circulating Fluidized Bed (CFB) Units (1-4)\” is a relatively old collection of papers with comprehensive content; I didn’t expect to find it available on Haichuan as well. Here is a case where insufficient efficiency of the cyclone separator led to an excessive amount of fly ash char, forcing the installation of a servo return device at the rear. Additionally, I would like to remind the original poster that, whether as a designer, an operation manager, or a technical service personnel, it is necessary to have a thorough understanding of the theoretical knowledge related to the industry – in terms of fuels, processes, and equipment. . . . Whether it is waste heat, boilers, or gas stoves, combustion science and heat transfer are involved; it is recommended to search using keywords (there is a large amount of such information on the Haichuan Forum).
The issue lies in the high carbon content of the fly ash in the fluidized bed boiler, which prevents it from reaching operating load. Engineer Liu 13002709449
The fine particles removed through dust removal must be blown away directly; ash particles with a diameter of less than 70 μm cannot be effectively captured by the separator. However, this amount of ash can increase the heat transfer coefficients of the furnace and the convective heating surfaces at the rear, thereby boosting the boiler’s output.