Fluid bed boiler for combusting biomass

• Main Author: XIANZE,LI PU
• Format: Patent
• Language: English
• Published: 15.08.2007
• Subjects: AIR; BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN; WEAPONS

A fluidized-bed combustion boiler burning with biomass mainly contains a fluidized-bed furnace body, which is characterized in that the boiler is equipped with separate high temperature area hearth 3. The hearth 3 is connected with an annular channel 11 which is formed between the outer cylinder 8 and inner cylinder 7. And the inner cylinder 7 is a circular or polygon close to rotundity cylinder which is composed by hearth transition region 4 and membrane type water wall. In the inner cylinder is a central flue 12, and in the annular channel 11 is equipped with multistage secondary air nozzle 6. The utility model is equipped with the separate high temperature area hearth, solving the problem of that the traditional boiler can not maintain the fuel layer, which can burn biomass grain fuel separately. The annular channel 11 which is formed between the outer cylinder 8 and the inner cylinder 7 adopts a polygon structure close to rotundity, which is in favor of the rotating up of the smoke. The internal and external double times heat exchange can improve the boiler thermal efficiency. The boiler has a plurality of gas-separation places, improving the environmental standards. The annular channel and the secondary air replace the high temperature separator and the intermediate temperature separator of the traditional boiler. The manufacturing process of the boiler is simple which greatly reduces failure rate.