China CFBC technology
Fluidized-bed combustion :
Fluidized-bed combustion Circulating Fluidized Bed Boiler In a CFB boiler furnace the gas velocity is sufficiently high to blow all the solids out of the furnace. The majority of the solids leaving the furnace is captured by a gas–solid separator, and is re-circulated back to the base of the furnace. The primary combustion air (usually sub-stoichiometric in amount) is injected through the floor or grate of the furnace The secondary air is injected from the sides at a certain height above the furnace floor. Fuel is fed into the lower section of the furnace, where it burns to generate heat. A fraction of the combustion heat is absorbed by water- or steam-cooled surfaces located in the furnace, and the rest is absorbed in the convective section located further downstream, known as the Back-pass.
Fluidized Bed :
Fluidized Bed A fluidized bed is a bed of solid particles which are set into motion by blowing a gas stream upward through the bed at a sufficient velocity to suspend the particles.
Bed Appearance :
Bed Appearance The bed appears like a boiling liquid.
Fluidization The fluidization occurs when the drag force on the particles in the bed due to the upward flowing gas just equals the weight of the bed.
CFBC History :
History During the 70s and also in 80s,, it appeared that conventional pulverized coal-fired power plants had reached a plateau in terms of thermal efficiency. The efficiency levels achieved were of the order of 40 percent in the US and the UK.The corresponding figures for India, however, were lower at 36 to 37 percent. An alternative technology, Fluidized Bed Combustion (FBC), was developed to raise the efficiency levels. In this technology, high pressure air is blown through finely ground coal. The particles become entrained in the air and form a floating or fluidized bed. This bed behaves like a fluid in which the constituent particles move to and fro and collide with one another.
Types (FB Boilers) :
1. Bubbling fluidized bed (BFB)
2. Circulating fluidized bed (CFB)
Circulating fluidized bed combustion(CFBC) Advantages :
1. Fluidized bed can burn a variety of fuels-coal as well other non-conventional fuels like biomass, petro-coke, coal cleaning waste and wood. This bed contains only around 5 percent coal or fuel. The rest of the bed is primarily an inert material such as ash or sand. Fluidized bed boilers are capable of burning a wide range of fuels cleanly, including biomass fuels such as wood waste.
2. The Temperature in FBC is around 800-900°C compared with 1300-1500°C in pulverized coal combustion (PCC). Low Temperature helps minimize the production of NOx (nitrogen oxides). With the addition of a sorbent into the bed (mostly limestone), much of the so2 formed can be captured. The other advantages of FBC are Compactness Ability to burn low calorific values (as low as 1,800 kcal/kg) Production of ash which is less erosive. Moreover, in FBC, oil support is needed for 20-30 percent of the load versus 40-60 percent in PCC. FBC based plants also have lower capital costs compared to PCC based plants. The capital costs could be 8-15 percent lower.
Applications of CFBC :
Applications of CFBC The first CFBC power plant of 110 MW at Nuclu. Colorado, USA is operating since 1990. Several such CFBC power plants are operating in Germany, UK, Canada and Japan using various kinds of coal and bio-mass fuels. The largest CFBC power plant is the 250 MW unit in Gardane, France, commissioned in 1996. Presently, 350 MW units are being constructed in Canada and Japan. CFBC is a mature technology with more than 300 CFBC boilers in operation world wide ranging from 5 MW to 250 MW. With lime stone addition, 90 % of the sulfur emission can be retained. With staged combustion and with relatively low combustion temperature of 850 / 900° C, NO2 formation is about 300 to 400 mg/Nm3 only against 500 to 1000 mg/Nm3 in conventional PF fired boilers.
Circulating fluidised bed Boiler Cases
ZG Boiler Workshop
Why choose ZG Boiler as China CFBC technology manufacturer
We have over 70 years' experience of boiler and autoclave, and we have a professional installation and after-sales staff for products.Take advantage of the most economical way to improve efficiency and operating flexibility, Get substantial savings on your fuel costs,Reduce all emissions for each K/W of electricity generated, including CO2.
How about the quality of China CFBC technology ?
Our China CFBC technology manufactured strictly according to national and international standard. our products have approved ASME, IBR, ISO9001-2008, etc
All our company's products are 100% factory inspected to ensure the high quality.
We provide one year quality warranty service, please rest assured purchase.
Basic Information of CFB Boiler manufacturer--- ZG Boiler
Number of Employees:above 1500 People
Our products:industrial horizontal steam boiler and hot water boiler(biomass boiler, gas boiler, oil boiler, coal boiler, etc), CFB boiler, power plant boiler, waste heating recovery boiler, Pressure Vessel(AAC autoclave, Curing tank,etc )
Factory Size (Sq.meters):400,000 square meters
Factory Location:Factory 1: Zhengzhou,,Henan, China. Factory 2: Xingyang,Henan,China
Number of R&D Staff:376 people
Our Trade & Market
Total Annual Sales Volume:US$100 Million
Main Market:South America(Colombia, Venezuela, Guyana, Suriname, Ecuador, Peru, Brazil, Bolivia, Chile, Paraguay, Uruguay, Argentina and French Guiana),
North America(Bahamas, Canada, Costa Rica, Cuba, El Salvador, Guatemala, Honduras, Haiti, Jamaica, Mexico, Nicaragua, Panama),
Eastern Asia(Mongolia / Russia / North Korea / South Korea / Japan),
Oceania(Australia, New Zealand, Fiji),
Mid East(Bahrain, Egypt, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia, Syria, UAE and Yemen, Palestine, Algeria, Libya, Morocco, Tunisia and Sudan, Mauritania and Somalia),
Africa(Egypt, Sudan, Libya, Tunisia, Algeria, Morocco, Ethiopia, Somalia, Kenya, Tanzania, Sierra Leone, Liberia, Cote d'Ivoire, Ghana, Togo, Niger, Nigeria, Cameroon, Gabon, Congo (Brazzaville), Zambia, Zimbabwe, Angola, Mozambique, Botswana, Namibia, South Africa),
South Asia(Nepal, Bhutan, India, Pakistan, Bangladesh, Sri Lanka, Maldives)
Southeast Asia(Vietnam, Laos, Cambodia, Thailand, Myanmar, Malaysia, Singapore, Indonesia, Brunei, the Philippines, East Timor)