CFB(circulating fluidized bed )coal-fired hot water boiler

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Our coal-fired chain grate boilers and coal-fired fluidized bed boilers mainly produce hot water, saturated steam or superheated steam for industrial use. Coal-fired boilers have lower operating costs – nearly 50% lower than boilers using oil or natural gas.

Address: No. 76, Xin Da Road, Zhou tie Town, Yixing, Wuxi, China
E-mail: [email protected]
Phone: +86-13506151331

 

Introduction

Circulating fluidized bed is of low-temperature combustion, therefore, nitrogen oxides emissions of such boiler is much lower than that of coal-powder boiler, and such boiler could directly desulfurized during combustion process. Circulating fluidized bed boiler with high desulfurization rate is economical.

Circulating fluidized bed boiler could adopt various coal types and has high combustion efficiency, which is especially suitable for low quality, low calorific value coal.

CFB is called “clean combustion technology” due to their outstanding performances in efficiency, energy-conservation, and low-pollution and low emission of carbon. It is pointed out in “The Outline for the 11th Five-year Plan for National Economic and Social Development” that “alterate or replace current medium and small coal-fired boiler (furnace) by adopting technologies such as CFB and coal powder combustion”

Benefits

Benefits
  • Suitable for various kinds of coal.
  • Load can be adjusted in the range of 25%~110%, average 5% in one minute.
  • Clean combustion and environment friendly.
  • Use lime stone mixed into the fuel for desulfuration, rate up to 84%.
  • NOx emission capacity can be controlled to 150ppm or less.
  • Ash with low carbon content can be used for cement or construction materials.

Construction

Construction
  • Broad Fuel Adaptability: CFB makes the newly sent coal particles and the already burt coal particles mixed up sufficiently, so the newly sent coal particles are rapidly heated to ignition temperature and burn. As a result, all kinds of coal can be burnt steadily and efficiently.
  • High Combustion Efficiency: the basic difference between CFB boilers and other types of boilers lies in the burning system. As stated previously, the thermal efficiency of CFB can be over 86%
  • Wide range and Rapid Load Adjustment: the load of a boiler often charges when the boiler is working. When the load drops below 70%, the combustion efficiency and thermal efficiency of other types of boilers will drop noticeably and the burning will be unstable, sometimes even the burning cannot be maintained normally; while by simply adjust coal air feeding and recycled material, the load of CFB can be adjusted in a range of 30-110%; the rate of load-adjusting is also rapid (generally 4% per minute) due to high section wind speed and easy control of heat absorption.

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