Biomass fired CFB boiler is the thermal equipment of biomass boiler using circulating fluidized bed combustion technology. The heat produced is used for power generation and large scale heating system. Circulating fluidized bed (CFB) is the best choice for burning biomass fuel. In fluidized bed, the bed material has high thermal capacity, providing sufficient preheating and drying heat source for biological waste. It has many advantages, such as high thermal efficiency, low wear rate, low NOx and SOx emission, etc. It has significant economic and environmental benefits.
Renewable Energy Source--Biomass energy is generated from organic material, plant or animal waste, which is burned to provide energy, e.g. heat & electricity.
Less Dependency on Fossil Fuels--Using biomass as an alternate source of fuel reduces our dependency on fossil fuels which is better for the planet and more cost effective.
Very Easily Available--Biomass is cheap and readily available source of energy.
Biomass energy is a clean energy, and the content of harmful substances (sulfur and ash) in biomass energy is only about 1/10 of coal. Compared with fossil fuel boilers, biomass boiler have great environmental benefits. In additional, by burning biomass for energy, we can take waste that is harmful to the environment and turn it into something useful
Biomass is one of the most plentiful and well-utilised sources of renewable energy in the world. In recent years, bioenergy for electricity and transport biofuels has been growing fastest, mainly due to higher levels of policy support.
The best choice for high parameter and high loadbiomass central heating, cogeneration and centralizedpower generation.
The level requirements of the operator are low, less equipment, simple electronic control, easy operation, the investment cost of the boiler room is saved a lot.
Mainly used in the industrial field and its capacity is small , which is suitable for the areas where heat and power cogeneration and central heating are not covered.
Reliable water circulation, large volume, layer combustion, energy saving. Because of the limitation of furnace type, high load and high parameter technology hard to tackle.
Circulating fluidized bed technology is a rapidly developing combustion technology of high efficiency and low pollution,the next few years will be an important period of its rapid development. Why the CFB system is more and more popular in industries?
Adopting narrow and high flue and optimized inlet speedof separator, which strengthen the trend of materialconcentration and separation.
The furnace adopts the design concept of equal flowvelocity and the design of the full suspended membranewater wall.
The central tube adopts a bias structure and optimizesthe insertion depth of the central tube to improve theseparation efficiency.
Air staging in the lower furnace through theintroduction of primary air and secondary air atappropriate levels for biomass fuel fully combustion.
By means of direct feed and three shafts double helixfeeders in front of the furnace are fed into the furnacethrough three feeding devices to prevent fuel entanglementand affect feeding safety.
The lower part of the furnace adopts 5.74 anti abrasionheight, and a unique anti abrasion structure is designed,which can effectively prevent the water wall from beingworn out.
The special adjustable inlet flue gas flow device is set up, the inclined wind chamber and the fluidized cap are used independently, and the dust is taken away by the flue gas through the fluidized cap to keep the dust in the micro flow state, so as to prevent the ash accumulation.
Superheater: avoid high temperature superheater ash deposition, reduce the high temperature corrosion.
The self hanging structure of U type suspension is adopted and optimized. The bottom connection adopts a unique external set box connected structure to ensure the safety and simplify the design process.
Air preheater: adopting a horizontal pipe structure, which is divided into two levels. The upper level is the two air and air preheater, and the lower level is the primary air and air preheater, all of them are double stroke.
Light tube structure, which is divided into three stages, and the appropriate under enthalpy and working fluid velocity are designed to ensure the operation safety of the economizer.
2 sets of 75t/h biomass fired CFB boilers
CN25-3.82/0.98 steam turbine units, cooling, water supply and other auxiliary facilities
Rape straw, bamboo chips, straw, other agricultural and forestry wastes.
the annual total generating capacity is 150 million kw•h, the annual power supply is 110 million kw•h, the annual volume of steam supply is 240 thousand tons and the heating is 1 million kw•h.
This biomass fired CFB boiler project can save160 thousand tons / year of coal, CO₂ emission is decreased by 432 thousand tons / year. The on-line detection data show that the initial emission concentration of NOx is within the range of 50 ~ 80mg/Nm3, that is, it can meet requirements of the thermal power plant emission standard without denitrification.
The annual treatment of 287 thousand and 200 tons of agricultural and forestry biomass. It can bring farmers large incomes every year and crate work opportunity for them; while increasing the income of local farmers.
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