In a fluidized bed combustion system, the fuel / bed material is a source of the particles. In the case of coal, the burning particles & and the burnt particles are the main contributors which decide the fluidization behaviour in the bed. The bed material which is used for start up of …
25-Questions & Answers on AFBC Boilers - Power plant and …
2021年1月25日 · What do you mean by IBE & IBSH in FBC Boilers? IBE: In Bed Evaporating Coils. In some FBC Boilers, complete furnace is covered with evaporator coils. Coils are generally fitted in 2 nos inner & outer. To prevent erosion due to fluidizing materials, coils are covered with refractory materials. IBSH: In bed Super heater coils
AFBC BOILERS PERFORMANCE IMPROVEMENT | PPT - SlideShare
2019年9月12日 · AFBC BOLER Fluidisation • The burner is put on for 3 hrs to raise the boiler pressure slowly and to promote circulation in bed coils & other evaporative circuits. • In over bed burner start up system, the bed never gets heated up beyond 150 deg C.
AFBC Boiler - Bed Coils Frequent Failure - CR4 Discussion Thread
2011年10月17日 · If the boiler load varies rigarously and if boiler tripping is frequent and if black-out happens frequently, all these reasons contribute in braking the magnetite layer inside the bed coil tubes and tubes become suspetible for internal erosion and hence failure.
Capacity enhancement study of AFBC boilers & CFD application
2023年9月13日 · Bed coils are provided with 4 deg slope. This enables 90% coil immersion even with 900mm bed height from the DB plate. The bed coil HTA is sufficient for the additional capacity. The coil length required for the design boiler load of 90TPH is 1164m and the equivalent plain tube length available is 1299m.
Atmospheric Fluidised Bed Combustion (AFBC), which promises to provide a viable alternative to conventional coal fired and other solid fuel fired boilers for utility and industrial applications. TBWES began investigating various aspects of the AFBC process in the mid -70s and has become the technological
Bed Material for Fluidized Boilers – Jainco Refractories
Increases efficiency and life span of boiler tubes as well as refractory lining. The material is most suitable for recycling in certain conditions on account of its very special feature of high refractoriness and dense texture.
Atmospheric fluidized bed combustor (AFBC) boilers for steam or electricity generation is gaining popularity because of its ability to burn wide variety of fuels with low atmospheric emissions. Compared to pulverized coal fired boilers, the AFBC boilers are more susceptible to erosion along the fireside path.
Types of Fluidised Bed Combustion Boilers - OpExWorks
There are three basic types of fluidised bed combustion boilers: Pressurised Fluidised Bed Combustion System (PFBC). In AFBC, coal is crushed to a size of 1 – 10 mm depending on the rank of coal, type of fuel feed and fed into the combustion chamber.
This paper is about a repetitive evaporator tube failure experienced in an AFBC boiler. The mode of a bed evaporator tube is generally erosion or overheating or water side corrosion. But this case was thermal fatigue. Photo 1 shows the alligator skin like appearance at the failed portion .