The recirculated cold fly ash takes over the cooling of the fluidised bed. Boilers bureau of energy efficiency 27 syllabus boilers. Afbc boiler is a very developing technology now these days this technology is widely used in the industrial boiler for the purpose of efficient and clean burning of coal and other fuel for steam generation. The boiler is of single drum design with bed sh, radiant sh, convection sh, economiser, air preheater and esp. Photo 1 shows an overview of a cfbc boiler facility. At the bottom of the boiler furnace there is a bed of inert material. Due to lower operating temperatures, the afbc boiler design is less dependent on fuel and fuel ash characteristics than conventional boilers. Sox control is achieved by limestone addition in the bed and fgd flue gas desulphurisation is eliminated. Basically boiler efficiency can be tested by the following methods. Atmospheric and pressurized fluidised bed boilers design their problems. With warming water temperatures will produce refractory materials that will. Low fluidizing velocity for lower wear of bed tubes. Afbc atmospheric fluidized bed combustion boiler cold. Working steam meter water meter present steam tph average any operational problem to mention steam tpd average steam enthalpy cal recent boiler energy audit conducted date, please enclose the report average steam cost mt chargewave energykem coal fired fbc afbc boiler operation data inquiry sheet coal feeders feed kg rpm if caliberated.
Jun 25, 2019 dear all, please tell me what is different between afbc boiler amp cfbc boiler. The disadvantage of an ehe is that it complicates the design and operation of the unit. Types, combustion in boilers, performances evaluation, analysis of losses, feed water treatment, blow down, energy conservation opportunities. Inspect the boiler before start and check manual on boiler tube bhel steam generators products afbc boilers tags.
Up to 200 tph twelve 12 nos afbc boilers having capacities varying between 55 tph to 170 tph have already been commissioned. The report also brings out technical problems with design and operation of the. Survey on startup operation procedure for indian fluidised. It is in the convection pass, that the heat taken is transferred to the convectional heating surfaces. Introduction to boiler a boiler is a closed vessel in which water or other fluid is heated. In fluidized bed combustion boiler technology when air or gas is passed through an inert bed of solid particles such as sand supported on a fine mesh or grid, the air initially will seek a path of least resistance and pass upward through the sand. If cfbc is used instead of afbc boiler than 250 kg of. In afbc boiler fluidization bed combustion is method of burning of solids fuel in which the fuel is continuous fed into hot fluidized bed of inert bed. Refractory experience in circulating fluidized bed combustors. Cfbc boiler is a singledrum, natural circulation, top supported, and membrane wall construction. All this without compromising efficiency and with reduced emissions. The fluidized bed boilers have a wide capacity range 0. Although afbc boilers are economically competitive with conventional coal fired.
This article gives a brief description of the working of a cfb boiler. Although afbc boilers are economically competitive with conventional coal fired boilers and offer greater fuel flexibility, afbc boilers firing coal are not competitive with oil or gas in the. Afbc atmospheric fluidized bed combustion boiler cold start up procedure. Atmospheric classic fluidized bed combustion system afbc the velocity of fluidizing air is in the range of 1. Recently, however, cfbc boilers using rdf and woodbased biomass as the fuel have drawn attention. There are more than 42 nos afbc boilers operating worldwide which were designed as per doosan power system. Pdf atmospheric fluidized bed combustion afbc technology involves burning. In some cases, you likewise attain not discover the proclamation afbc boiler. Atmospheric fluidised bed combustion boiler afbc capacities.
Afbc technology promises to provide a viable alternative to conventional coalfired and other solid fuelfired boilers. We are also actively bidding on afbc boiler proposals for the world wide market. It is in the convection pass that the heat taken is transferred to the convectional heating surfaces. The cfbc boiler has more advantages than afbc boiler. Jan, 2020 afbc boiler is a very developing technology now these days this technology is widely used in the industrial boiler for the purpose of efficient. Sep 06, 2020 isgec afbc boiler suitable for cogeneration and captive power. Afbc boiler based thermal power plant 30 mw working principle. Cfbc needs huge mechanical cyclones to aquire and recycle the high amount of bed material, which need tall. According to the principle of operation the steam separator is classified as. The start up of fluidised bed combustion boilers has always been a subject of the most difficult operation.
Today we discussed about the cfbc circulating fluidization bed combustion boiler pressure parts and their uses. Popular type of boiler used for combined cycle power generation application. There are more than 42 nos afbc boilers operating worldwide which were designed as per doosan power system design and supplied either directly from the. Chargewave energykem coal fired fbc afbc boiler operation. Many boiler users find it difficult to get their operators. Afbc boiler, heat loss method, flue gas temperature, efficiency. Circulating fluidizedbed combustion technology cfbc. Both the boiler has same working system but in cfbc the unburnt coal is resend in the furnace for the burning process. One is a vibration problems experienced in cfbc boilers and other is about a repeated bfp failure in a power plant.
There are more than afbc boilers operating worldwide which were designed as per power system design and supplied either directly produced by their licensees. This cfbc mechanism uses the fluidized bed principle in which squash 7. Afbc boiler, afbc boiler working principle,atmospheric. By using cfbc coal burning rate per hour decreases as compared to afbc boiler. To improve thermal efficiency of 27mw coal fired power.
Unlike the bubbling afbc boilers the erosion prone submerged heating surfaces are dispensed with. E thermal engineering rect trichy in this paper case studiestwo are presented, which arerelevant to boiler operating and design engineers. Fbc fluidized bed combustion is a combustion technology used to burn solid fuels in steam boilers. Corrosion of bed coil of boiler introduction atmospheric fluidized bed combustion afbc boiler atmospheric fluidizedbed combustion afbc boilers offer efficient, cost effective and reliable steam generation. Sep 14, 2016 2 important parameters in afbc boiler 1. Internal recycle circulating fluidized bed, boiler ircfb, natural circulation. About the boiler the fluidized bed boiler parameters are 50 tph, 66 kgcm2 g, 490 deg c and feed water temperature is 140 deg c.
Boiler availability load vs efficiency data from operating. Rankine cycle, afbc boiler, ash handling system, coal fired. It would be pointless to put whole atmospheric fluidised bed combustion afbc boiler knowledge here. Atmospheric fluidised bed combustion boilers for firing solid. Hello friends, power plant discussion welcome to all of you my friend to this channel, my name is chandan pathak, i have 10 years of experience in power pl. Introduction, mechanism of fluidized bed combustion, advantages. The bubbling type afbc boiler offers efficient, costeffective, reliable and viable alternative to conventional solid fuelfired boilers for industrial applications. Fluidized bed combustion boilers can operate with overall efficiency of a 75 2% b 80 2% c 84 2% d 90 2% 20. Case studies in boiler vibrations and bfp cavitation by k. Pdf an overview of atmospheric fluidized bed combustion. Afbc and cfbc boilers circulating fluidised bed combustion operation manuals presentations. Afbc boiler working principle and operationzbg boiler. With over 280 installations across the world, the boiler offers benefits like fuel flexibility, high efficiency, low emissions, and reduced capital and operating expenses.
In fbc boilers the percentage of bottom ash to the total ash is about. Technological collaboration with power systems for boilers up to 300 tph. Cfbc boilers are mostly claimed to be more cost effective than afbc boilers for industrial uses requiring more than 80110 thr of steam. The cfbc gained popularity mainly as a coalfired boiler. Fuel consumption is less as compared to afbc afbc boiler flue gas. This section is all about afbc and cfbc boilers circulating fluidised bed combustion operation manuals. Isgec afbc boiler atmospheric fluidised bed combustion. Photo 1 shows the alligator skin like appearance at the failed portion. Afbc boiler vs cfbc boiler circulating fluidized bed boiler. Atmospheric fluidised bed combustion boilers for firing.
Almost all afbc bubbling bed boilers use evaporator tubes in the bed of sand. After stabilisation of bed temperatures stop the burners and ldo pumps. Afbc boilers firing coal are not competitive with oil or gas versa. Although afbc boilers are economically competitive with conventional coal fired boilers and offer greater fuel flexibility. Circulating fluidised bed combustion cfbc boilers powerful. Cfbc boiler working and principles of cfbc boiler in. Fbc boiler operation pdf free download as pdf file.
The boiler is supposed to have been designed for many load combinations as below. The mode of a bed evaporator tube is generally erosion or overheating or water side corrosion. This principle of fluidisation is illustrated in figure 6. Isgec afbc boiler has large freeboard height, high residence time and electrostatic. This is also known as inputoutput method, where the energy gain of the working fluid water and steam is compared with the energy content of the boiler fuel. Circulating fluidized bed cfb combustion boilers gives the flexibility for combustion of a wide range of coals and alternative fuel sources. Sep 02, 2017 afbc atmospheric fluidized bed combustion boiler cold start up procedure. In fbc boilers the percentage of bottom ash to the total ash is. It operates by using the main principles of fluidised bed combus. Difference between afbc and cfbc boiler pdf difference between afbc and cfbc boilers. The heated or vaporized fluid of the boiler for use in various processes or heating applications types of boilers. The design boiler efficiency is 87% with a d grade indian coal of 36. Refractory experience in circulating fluidized bed. Efficiency improvement opportunity in boiler without.
First, power plants themselves use electricity for their operation lighting, pumps, etc. Performance improvement of afbc boiler through analysis of. Further six 6 nos afbc boilers are under various stages of erection and commissioning. Among the options coloradoute considered was the possibility of becoming a host utility to demonstrate atmospheric fluidizedbed combustion afbc technology. Oct 11, 2019 isgec afbc boiler suitable for cogeneration and captive power. Cfbc boiler based 60 mw thermal power plant working. Efficiency improvement opportunity in boiler without changing.
Atmospheric fluidised bed combustion boiler afbc enmas gb. Poor station efficiency, high fuel costs, and increasingly high boiler maintenance costs had forced the nucla station into a low position on the coloradoute dispatch order. The boiler parameters are 70 tph, 88 kgcm2, 510 deg c and feed water temperature is 124 deg c. Bed height fd air pressure static height for afbc boiler is to be maintained 250 to 300mm during initial light up of boiler. Boiler operation engineering questions and answers pdf. This paper is about a repetitive evaporator tube failure experienced in an afbc boiler. Unlike bubbling afbc boilers, erosionprone submerged heating surfaces are dispensed with. Inspect the boiler before start and check the following 1. Cfbc circulating fluidization bed combustion boiler. Unburnt losses are less in cfbc as compared to afbc boiler.
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