A circulating fluidized bed whole bale combustion biomass apparatus and method

By employing dynamic breaking of bales with breaking rollers and secondary air feeding in a circulating fluidized bed, the problems of unstable combustion and high NOx emissions of biomass in circulating fluidized bed combustion have been solved, achieving low-cost, high-efficiency combustion and environmentally friendly emissions.

CN122216632APending Publication Date: 2026-06-16HAILUN LIMIN ENERGY SAVING BOILER MFG
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HAILUN LIMIN ENERGY SAVING BOILER MFG
Filing Date
2026-05-07
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing circulating fluidized bed combustion of biomass suffers from high fuel pretreatment costs and unstable combustion when moisture content is high. Stove combustion in stove furnaces also presents problems such as high carbon content in bottom ash and high NOx emission concentration.

Method used

The system uses a crushing roller above the dense phase zone of a circulating fluidized bed to dynamically break up the entire bundle of biomass. The high-temperature baking effect of the dense phase zone dries and crushes the high-moisture biomass before it falls into the dense phase zone for combustion, increasing the combustion temperature in the dense phase zone, reducing operating costs, and then sending secondary air into the dilute phase zone to participate in combustion, thus controlling NOx emissions.

Benefits of technology

It significantly reduces combustion instability, lowers the pretreatment cost per ton of straw by 30-40 yuan, ensures the carbon content of the bottom ash is ≤0.5%, and reduces NOx emission concentration to ≤150mg/m3, thereby improving combustion efficiency and environmental performance.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122216632A_ABST
    Figure CN122216632A_ABST
Patent Text Reader

Abstract

A circulating fluidized bed device and method for burning whole bales of biomass, belonging to the field of biomass combustion. The upper part of the circulating fluidized bed furnace is a dilute phase zone, and the lower part is connected to a dense phase zone and an air chamber in sequence. A feed inlet is provided on the side wall of the circulating fluidized bed, and two sealing doors are movably installed inside the feed inlet. Multiple crushing rollers perpendicular to the feed inlet are provided in the lower part of the dilute phase zone. All crushing rollers are divided into multiple pairs, and both ends of each crushing roller rotatably pass through through holes provided on the front and rear walls of the circulating fluidized bed. Each pair of crushing rollers is connected by a transmission mechanism, and one of the crushing rollers in each pair is connected to the output shaft of an external motor. Multiple crushing teeth are welded circumferentially on each crushing roller. Secondary air inlets are provided on both the front and rear side walls of the circulating fluidized bed. The flue gas outlet at the top of the circulating fluidized bed is connected to a cyclone separator. The outlet of the return valve at the lower end of the cyclone separator is connected to the dense phase zone, and the flue gas outlet at the top of the cyclone separator is connected to the tail flue. This invention is used for burning whole bales of biomass.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Straw bundle burning direct-fired biomass boiler with in-boiler drying function

    CN114704818A