Circulating fluidizedbed combustion technology cfbc technology overview. The effect of bed pressure drop and bed inventory on the performances of a circulating fluidized bed cfb boiler was studied. Circulating fluidised bed combustion boiler cfbc enmas. Zeeco recently completed a solid fuel to natural gas conversion of a circulating fluidised bed cfb boiler designed for 1. 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.
Effect of bed pressure drop on performance of a cfb boiler. Key benefits are fuel flexibility, reduced emission and lower bed temperature. Cfbc boiler, cfbc boiler suppliers and manufacturers at zg 210t 6. Technology comparison of cfb versus pulverizedfuel firing. Boiler tube failures btfs represent the cause of these failures is due to fly ash erosion. History and current status of circulating fluidized bed combustion cfbc technology. What is the difference between an afbc and cfbc boiler. 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.
The fluidized bed boilers have a wide capacity range 0. A stable, robust design is also essential if a boiler of this. In the large number of books devoted to scientific progress over the years, one major conclusion can be drawn. Ultrasupercritical circulating fluidized bed cfb boilers. Pdf the erosion resistance of dense refractory bricks or castables used in cfbc boilers is tested as per astm c 704. Ijreat international journal of research in engineering.
Boilers, were a major part of the industrial revolution beginning about 1700. 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. Wide fuel band can burn coal, lignite, washery rejects, pet coke etc. Circulating fluidized bed cfb boilers technology meets todays market demand for utilitysize boilers with capability for fire broad range of fuel qualities from. For large units, the taller furnace characteristics of cfbc boiler offers better space. It may be emphasised that conversion of a conventional coal fired system to a fluidised bed. 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. One major difference is the cfb utilizes a continuous hot solids return system to the furnace which offers many advantages. Circulating fluidized bed combustion cfbc sciencedirect. Developments in circulating fluidised bed combustion.
Design parameters for 200 mwe cfbc conceptual design study. During consideration and analysis of the data given in table 1, it has to be pointed out the following. Introduction, mechanism of fluidised bed combustion, advantages, types. In the end of 2003 oil shale circulating fluidized bed cfb combustion was introduced. Sitong low pressure circulating fluidized bed boiler is a. The cfbc boiler is capable of burning fuel with volatile content as low as 8 to 9 percent e. Handle high sulphur, high ash and high moisture fuels, petcoke, sludge, washery rejects, lignite, biomass. As we know that boilers are used in process industries for steam generators as well as in power plants for power generation. Superior features of cfbc boiler cold cyclone design 1. A cfbc could be good choice if the following conditions are met. Circulating fludize bed combustion cfbc boiler authorstream. Circulating fluidized bed combustion cfbc request pdf. Circulating fluidized bed combustion boilers are mainly for medium and large power cfbc boilers offer greater flexibility as shown in figure 12.
What is the difference between afbc and cfbc boiler,cfbc. Volumes international conference on fluidized bed combustion. Deterioration of fuel quality and water quality also leads to poor performance of boiler. Boilers bureau of energy efficiency 27 syllabus boilers. What is the working principle of cfbc boiler 20170606 15. Circulating fluidized bed boiler is consisting of combustion chamber, separator, fly ash circulating system, superheater, convection bank, economizer, and air preheater. High efficiency even at part loads low operating cost. Atmospheric and pressurized fluidised bed boilers design their problems. Circulating fluidized bed boiler cfb boiler ge power. Here you can make instant conversion from this unit to all other compatible units. Afbc atmospheric bubbling fluidized bed combustion cfbc circulating fluidized bed combustion long answer. Energy performance assessment of boilers bureau of energy efficiency 1 1.
Circulating fluidized bed combustion cfbc pdf free. Circulating fluidized bed combustion has given boiler and power plant operators a greater flexibility in burning a wide range of coal and other fuels. 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 maintenance. M i r e k, czestochowa university of technology, poland doi. This section is all about afbc and cfbc boilers circulating fluidised bed combustion operation manuals. Pdf energy and exergy analysis of cfbc boilers researchgate. This work is concerned about erosion failure analysis of cfbc boiler, in which gassolid twophase mixtures flowing upwards through the fast beds. Types, combustion in boilers, performances evaluation, analysis of losses, feed water treatment, blow down, energy conservation opportunities. A proven concept in steam generators, these stateoftheart systems are designed and manufactured for a wide range of upto 550 tph. Solids separator hot cyclone plate type plate type uncooled hot cyclones with loop seal assembly are adopted in enmas gb. 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.
A modern concept in steam generators, these boilers are designed and manufactured for a wide range up to about 550 tph capacity. 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. 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 is a energy saving type industrial boiler,which can be used for cogeneration in power plant or industry production. Circulating fluidizedbed combustion technology cfbc. The fuels burnt in these boilers include coal, washery rejects, rice husk, bagasse and other agricultural wastes. This paper is focused on energy and exergy analysis of cfbc boiler and. Units of power converter common units horsepower, boiler hps online converter page for a specific unit. Circulating fluidized bed combustion cfbc boilers above. They are major consumers of industry and building energy consumption today. Combustion in a cfbc boiler tapash nag tn 28 nov 20 v0 1 2. Circulating fluidised bed combustion boiler cfbc capacities.
Investigation of the suitability of serbian lignites for burning in cfbc boilers s. Cfbc boiler manufacturer, rdf boiler faq about rdf boiler 1. 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. What is the difference between afbc and cfbc boiler. Industrial boiler systems can cope with much higher pressures than pressure cookers. Overview of wear problems in circulating fluidized bed boilers. 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. Cfbc boiler stands for circulating fluidized bed combustion boiler. 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. 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. By using the state specification design theory, the fluidization. Hot air is necessary for rapid combustion in the furnace and also for drying coal in milling plants. Cfbc boiler manufacturer, convert boiler heating surface to horsepower faq about convert boiler heating surface to horsepower 1. For pcc and cfbc boilers, oxyfuel combustion systems that produce high purity.
Cfbc needs huge mechanical cyclones to aquire and recycle the high amount of bed material, which need tall boiler. A wide variety of cfbc boiler options are available to you, such as industrial. Critical velocity at which the pressure drop across the bed equals the weight of particles per unit cross sectional area of bed. Performance guarantee test assessment of cfbc boiler. 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. Fluidization is the process by which the solid particles are brought to a suspended state through gas or liquid. Performance analysis of 250 mw lignite fired circulating. Technology overview circulating fluidizedbed combustion. In a fluidisedbed combustor, combustion occurs when the. The response shall necessarily be accompanied with details on company background, product. Nagesh furnace chamber for controlled combustion of coal. Circulating fluidized bed combustion an overview sciencedirect.
The features of circulating fluidizedbed boilers are described below. We have over 70 years experience of industrial steam boiler and autoclave,and we have a professional installation and aftersales staff for products. 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. Technoeconomic analysis of pc versus cfb combustion. Why choose zg as convert boiler heating surface to horsepower manufacturer. Performance guarantee test assessment of cfbc boiler ijiset.