Circulating fluidized bed
combustion technology is a clean coal combustion technology that
developed in the past 20 years, circulating fluidized bed boilers
have wide fuel adaptation, high combustion efficiency, low NOx
emissions, low cost of furnace limestone desulfurization, strong
load adaptability, can burn low grade fuels and other advantages.
Along with economic development and improvement of the living
standard, city central heating requirements gradually increased,
and hot water heating has been developing rapidly in domestic
within the past decade.
The QXX high-speed external CFB Boiler
is used in large central heating supply engineering and steam
supply project of production, and all kinds of heating system of
the enterprise and city.
1, high combustion efficiency, energy saving evidently. Due to
circulating fluidized bed boiler gas-solids mixed well, and the
fuel particles could recycle burning, so the time of fuel kept in
the furnace become longer, the combustion efficiency is up to
97-99%. Boiler thermal efficiency is about 85%, 15%-20% higher than
the national standard. Bring remarkable energy saving effect and
economic benefit. Also reduce the waste of energy and the
particulate emissions, have great social benefit.
2, energy saving circulating fluidized bed boiler has wide output
adjustment range and fast regulation speed. high air velocity and
fuel concentration are easy to control make its heat-absorbing
easier to control, so the energy saving circulating fluidized bed
boiler with strong ability to adapt the load changing, load range
change ratio is up to 1/3~1/4. Both high and low load, the
combustion efficiency could maintain a constant value. At the same
time, the load regulation speed is fast, up to 5% per minute. So
the boiler is particularly applicable for companies regulate load
3,clean burning, excellent environmental performance. Circulating
fluidized bed combustion temperature only around 850 ℃~ 950℃, is a
low-temperature combustion, at the same time, adopt the staging
air, staged combustion, air get into bed from different heights
along with the flow of combustion, combustion chamber is in a
circulating combustion state, thus there are three major techniques
in environmental benefits.
①, add limestone to the fuel, can be economically desulfurization,
when the Ca / S molar ratio is 1.5 to 2.5, the desulfurization
efficiency could up to 85% -90%.
②, due to the furnace temperature is in the range of 850 ℃ -950 ℃,
so the amount of NOx emissions can be controlled at 200ppm or less.
③, slag with high activity , low carbon content, can be used for
cement clinker and construction materials.
4, easy to ignite, and could press the fire for a long time. Higher
volume heat load, the cross-sectional area of its dense area is
only 1/3 ~ 1/2 of the traditional circulating fluidized bed boiler,
while the dense area is adiabatic chamber, so the ignition
convenient and easy, the press fire up to about 30 hours.
5, compact structure, low maintenance. Since circulating fluidized
bed boiler has few mechanical transmission, also no pipe laying
heating surface, so fundamentally eliminate grate drive failures
and pipe wear and extend operating cycle, reducing the labor
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