Difference between CFB boiler and pulverised coal boiler
CFB (Circulating Fluidised Bed) Boiler
Coal is mixed with sand and limestone/dolomite (to absorb SOx pollutant gases). Coal is combusted with the help of hot primary air from air pre-heater. However, here, coal doesn't combust violently resulting into flames, but rather the heat resulting from combustion is instantaneously exchanged with the water tubes running through the coal-bed-air suspension bed. Thus, the combustion of coal takes place at a relatively lower temperature of around 850-900 deg C, necessitating lower thermal insulation of the boiler compared to Pulverised Coal boiler.
Advantages of CFB boiler:
1. Lower combustion temperature translates into lower thermal insulation needs of the boiler, directly resulting in savings.
2. As most of the SOx gases are absorbed by the bed, flue gases can be cooled to lower temperatures than PC boiler, thereby increasing the amount of potential heat exchange.
3. Unburnt coal particles are recycled back with the help of cyclone separators. These separators separate heavy unburnt coal particles from the lighter ash particles by centrifugal action. The unburnt coal is then fed back into the bed for combustion. This results in direct savings on fuel.
Pulverised Coal Boiler
The fuel burnt in Pulverised Coal boiler is coal, which is pulverised (grinded into small powder form) in a coal grinding mill. Pulverised coal is often conveyed to the burners in boiler through pneumatic means (by forcing coal particles by using moving air) from the coal pulveriser mill.
Some issues with the Pulverised Coal boiler:
1. Coal is combusted at temperatures of about 1600-1800 deg C. At such high temperatures, NOx, which is a notorious pollutant, is formed.
2. SOx pollutants are carried away in flue gases, which condense to form highly corrosive sulphuric acid at temperatures around 140-160 deg C. Thus, the exhaust temperature has to be maintained above this temperature to avoid large-scale corrosion of boiler water tubes. This limits the boiler energy extraction efficiency and constitutes the largest heat loss from the boiler.
3. Unburnt coal particles can't be recycled, because there's no economical way to separate unburnt coal particles from the ash and flue gases.
Circulating fluidised bed Boiler Cases
ZG Boiler Workshop
Why choose ZG Boiler as Difference between CFB boiler and pulverised coal boiler 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 Difference between CFB boiler and pulverised coal boiler ?
Our Difference between CFB boiler and pulverised coal boiler 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)