Ultra-low emission energy-saving biomass circulating fluidized bed boiler

Abstract

The invention discloses an ultra-low emission energy-saving biomass circulating fluidized bed boiler. The ultra-low emission energy-saving biomass circulating fluidized bed boiler comprises a drum, a full-membrane fireplace hearth, a fluidized bed combustion chamber, a separation and return system and a tail shaft flue. The lower part of the full-membrane fireplace hearth is connected with the top of the fluidized bed combustion chamber through a three-stage outwardly-convex avoiding pipe structure with membrane walls. Secondary air inlet structures are arranged on the front membrane wall and the rear membrane wall of the three-stage outwardly-convex avoiding pipe structure. A feeding joint pipe of an air-cooled structure with broadcast wind and compressed air is arranged on the front membrane wall of the three-stage outwardly-convex avoiding pipe structure. The ultra-low emission energy-saving biomass circulating fluidized bed boiler has the good automatic ash cleaning characteristic, so that corrosion on the heated surface is avoided, the wear of the heated surface is reduced, the biomass bulk material entering the hearth ignites rapidly, the combustion effect is enhanced, the burning is facilitated, the thermal efficiency of the boiler is improved, meanwhile the boiler has the self-removal performance of pollutants, emission reduction in the pollutant furnace is achieved from the combustion source, and ultra-low emission, low energy consumption, low bed pressure, low wear, high-efficiency combustion and stable operation of the boiler are achieved.

Description

technical field [0001] The invention belongs to the technical field of circulating fluidized bed boilers, in particular to an ultra-low emission energy-saving biomass circulating fluidized bed boiler which directly burns pure biomass bulk materials. Background technique [0002] Due to the particularity of biomass fuel, there are many technical difficulties in the utilization of biomass bulk materials. Compared with coal, the composition distribution of biomass solid fuel is characterized by "three highs and three lows", that is, the content of volatile matter, oxygen and hydrogen is very high, the first two items are much higher than coal, while the content of carbon, sulfur and ash is relatively low, and the SiO in the ash 2 and K 2 O and Na 2 The content of O is significantly high; and has a carbon cycle ( CO 2 zero emissions) feature. At the same time, due to the collection of biomass fuel and the differences in regions and seasons, the moisture in the fuel fluctuat...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the deficiencies in the prior art, the present invention provides a method that can solve the problems of poor feeding, low burnout rate, low thermal efficiency, high energy consumption, poor low-temperature combustion effect, and pollutants in existing biomass circulating fluidized bed boilers. Ultra-low emission energy-saving biomass circulating fluidized bed boiler with problems such as high initial emission concentration

Images