What is the difference between afbc and cfbc boiler,cfbc. Circulating fluidized bed combustion cfbc sciencedirect. Circulating fluidized bed combustion boilers are mainly for medium and large power cfbc boilers offer greater flexibility as shown in figure 12. Cfbc, as an alternative to pulverised coal combustion pcc, uses a fluidised bed, an apparatus that mixes coal and air with a sorbent such as limestone during the combustion process, to facilitate more effective chemical reactions and heat transfer. Solids separator hot cyclone plate type plate type uncooled hot cyclones with loop seal assembly are adopted in enmas gb. Boilers bureau of energy efficiency 27 syllabus boilers. Cfbc boilers are mostly claimed to be more cost effective than afbc boilers for industrial uses requiring more than 80110 thr of steam. Effect of bed pressure drop on performance of a cfb boiler. M i r e k, czestochowa university of technology, poland doi. Volumes international conference on fluidized bed combustion. What is the working principle of cfbc boiler 20170606 15.
Here you can make instant conversion from this unit to all other compatible units. Performance guarantee test assessment of cfbc boiler ijiset. A proven concept in steam generators, these stateoftheart systems are designed and manufactured for a wide range of upto 550 tph. Circulating fluidized bed boiler cfb boiler ge power. These boilers are welded from thick steel plates that are up to 35 mm thick, making pressures of 30 bar and more possible.
Circulating fluidized bed combustion cfbc pdf free. We have over 70 years experience of industrial steam boiler and autoclave,and we have a professional installation and aftersales staff for products. Superior features of cfbc boiler cold cyclone design 1. This chapter is devoted to basic aspects of circulating fluidized bed combustion cfbc. They are major consumers of industry and building energy consumption today.
A modern concept in steam generators, these boilers are designed and manufactured for a wide range up to about 550 tph capacity. A wide variety of cfbc boiler options are available to you, such as industrial. In a fluidisedbed combustor, combustion occurs when the. Nagesh furnace chamber for controlled combustion of coal. Cfbc boiler manufacturer, convert boiler heating surface to horsepower faq about convert boiler heating surface to horsepower 1. Cfbc boiler is a energy saving type industrial boiler,which can be used for cogeneration in power plant or industry production. This boiler is a new generation of low speed circulating fluidized bed boiler based on domestic and international advanced technology and experience. Circulating fluidizedbed combustion technology cfbc technology overview. Cfbc needs huge mechanical cyclones to aquire and recycle the high amount of bed material, which need tall boiler. Overview of wear problems in circulating fluidized bed boilers. In the large number of books devoted to scientific progress over the years, one major conclusion can be drawn. Technology overview circulating fluidizedbed combustion.
Boilers, were a major part of the industrial revolution beginning about 1700. In both types of boilers, temperature in the bed is practically the same 800850oc, but in cfbc boilers it is constant along the furnace height, while in bfbc boilers large difference. Fuels with low ashmelting temperature such as wood, and biomass have been proved to be feedstocks in cfbc due to the low operating temperature of 8509000 c. Afbc atmospheric bubbling fluidized bed combustion cfbc circulating fluidized bed combustion long answer. Air preheater is a heat transfer surface in which air temperature is raised by transferring heat from other media such as flue gas. Investigation of the suitability of serbian lignites for burning in cfbc boilers s. Although the heat recovery areas of the boilers are similar with the exception of the reheat steam temperature control scheme, major differences can be seen in the furnace sections. A cfbc could be good choice if the following conditions are met. The response shall necessarily be accompanied with details on company background, product.
The fluidized bed boilers have a wide capacity range 0. A stable, robust design is also essential if a boiler of this. Circulating fluidized bed combustion has given boiler and power plant operators a greater flexibility in burning a wide range of coal and other fuels. During consideration and analysis of the data given in table 1, it has to be pointed out the following. Circulating fludize bed combustion cfbc boiler authorstream.
Design parameters for 200 mwe cfbc conceptual design study. Key benefits are fuel flexibility, reduced emission and lower bed temperature. Hot air is necessary for rapid combustion in the furnace and also for drying coal in milling plants. Cfbc boilers are generally claimed to be more economical than afbc boilers for industrial application requiring more than 75 100 thr of steam cfbc requires huge mechanical cyclones to capture and recycle the large amount of bed material, which requires a tall boiler. Combustion in a cfbc boiler tapash nag tn 28 nov 20 v0 1 2. In the end of 2003 oil shale circulating fluidized bed cfb combustion was introduced. As we know that boilers are used in process industries for steam generators as well as in power plants for power generation. Circulating fluidized bed combustion cfbc boilers above. What is the difference between afbc and cfbc boiler. For large units, the taller furnace characteristics of cfbc boiler offers better space. Different versions industrial boilers ore developing with gradual change in their design of different parts and to optimize the thermal efficiency, fuel multiplicity and to sustain with environmental norms, with cost effectiveness for installation operation and. Cfbc boiler stands for circulating fluidized bed combustion boiler. Developments in circulating fluidised bed combustion. Circulating fluidised bed combustion boiler cfbc capacities.
By using the state specification design theory, the fluidization. Pdf energy and exergy analysis of cfbc boilers researchgate. Circulating fluidized bed combustion cfbc request pdf. The fuels burnt in these boilers include coal, washery rejects, rice husk, bagasse and other agricultural wastes. The effect of bed pressure drop and bed inventory on the performances of a circulating fluidized bed cfb boiler was studied. Circulating fluidized bed cfb boilers technology meets todays market demand for utilitysize boilers with capability for fire broad range of fuel qualities from. Technoeconomic analysis of pc versus cfb combustion.
Sitong low pressure circulating fluidized bed boiler is a. Increased height of the cfbc boiler compared to the bfbc boiler. Cfbc characteristics operates under special fluid dynamic condition solid particles are mixed through furnace at a velocity exceeding the average terminal velocity of the particles major fractions of solids are captured by cyclone high recycle rate intensifies. Ultrasupercritical circulating fluidized bed cfb boilers. Circulating fluidised bed combustion boiler cfbc enmas. Atmospheric and pressurized fluidised bed boilers design their problems. It may be emphasised that conversion of a conventional coal fired system to a fluidised bed. Critical velocity at which the pressure drop across the bed equals the weight of particles per unit cross sectional area of bed. Energy performance assessment of boilers bureau of energy efficiency 1 1. Units of power converter common units horsepower, boiler hps online converter page for a specific unit. Cyclone reinjection of incombustible in to the furnace nozzle fluidising air is introduced at the base of the bed through a nozzle distributor and used as both fluidisation and. Industrial boiler systems can cope with much higher pressures than pressure cookers. This paper is focused on energy and exergy analysis of cfbc boiler and. This section is all about afbc and cfbc boilers circulating fluidised bed combustion operation manuals.
History and current status of circulating fluidized bed combustion cfbc technology. Types, combustion in boilers, performances evaluation, analysis of losses, feed water treatment, blow down, energy conservation opportunities. What is the difference between an afbc and cfbc boiler. Zeeco recently completed a solid fuel to natural gas conversion of a circulating fluidised bed cfb boiler designed for 1. Wide fuel band can burn coal, lignite, washery rejects, pet coke etc. Performance guarantee test assessment of cfbc boiler. Pdf the erosion resistance of dense refractory bricks or castables used in cfbc boilers is tested as per astm c 704. Cfbc is circulating fluidized bed boiler boiler in which coal is burnt in an environment of high concentration of bed material mineral matter derived from combustion of coal retained by using cyclone other means. Fluidization is the process by which the solid particles are brought to a suspended state through gas or liquid. One major difference is the cfb utilizes a continuous hot solids return system to the furnace which offers many advantages.
Cfbc boilers as per annexure3 and detailed product reference for major supplies in last 10 years as per annexure4 are received by bhel on or before 25th january 2018. The features of circulating fluidizedbed boilers are described below. This work is concerned about erosion failure analysis of cfbc boiler, in which gassolid twophase mixtures flowing upwards through the fast beds. Cfbc boiler manufacturer, rdf boiler faq about rdf boiler 1. Ultimate saving can be realized when steam from the coal fired boiler will generate electricity and extraction andor back pressure steam will be used for processing. Technology comparison of cfb versus pulverizedfuel firing. Circulating fluidizedbed combustion technology cfbc. In case of cfbc, circulating fluidised bed combustion, the furnace is pressurised and the furnace gas is recirculated to capture the unburnt carbon, chat now. Ijreat international journal of research in engineering. Generally in cfbc boiler erosion caused in second pass of coal fired boilers due to impingement of high velocity ash particles on boiler tubes near sidewalls and rear front wall.
Introduction, mechanism of fluidised bed combustion, advantages, types. For pcc and cfbc boilers, oxyfuel combustion systems that produce high purity. Performance analysis of 250 mw lignite fired circulating. The cfbc boiler is capable of burning fuel with volatile content as low as 8 to 9 percent e. Why choose zg as convert boiler heating surface to horsepower manufacturer. Circulating fluidized bed combustion an overview sciencedirect. Deterioration of fuel quality and water quality also leads to poor performance of boiler. High efficiency even at part loads low operating cost. Cfbc boiler, cfbc boiler suppliers and manufacturers at zg 210t 6. Circulating fluidized bed boiler is consisting of combustion chamber, separator, fly ash circulating system, superheater, convection bank, economizer, and air preheater.