公开(公告)号：US4235174A

公开(公告)日：1980-11-25

申请号：US963624

申请日：1978-11-24

Applicant: Robert M. Spurrell

Inventor： Robert M. Spurrell

IPC: F23G5/02 ,  F23G5/04 ,  F23G5/46 ,  F23G5/00

CPC classification number: F23G5/46 ,  F23G5/02 ,  F23G5/04 ,  F23G2201/602 ,  F23G2209/261

Abstract: Overall heat recovery from wet wood waste, particularly sawmill-generated hog fuel, is improved by a process for predrying the fuel. A wet oversize fraction of the fuel is combusted in a fluid bed reactor providing heat for drying the remaining smaller sized fraction of the waste pile to about 10-30% moisture by weight. The gaseous products of the fluid bed burning are contacted with the fuel fraction in, preferably, a rotary dryer. The dried fuel is then screened into coarse and fine fractions. The coarse fraction is fed onto a grate of a wood waste boiler. The fines fraction is injected into the boiler combustion in an air suspension. The amount of fuel fed to the fluid bed reactor is 10-25% of the total fuel flow, depending upon the moisture content of the fuel. The gases fed to the rotary dryer are less than about 1,200.degree. F., to minimize "blue haze," by combining with minimum outside air.

Abstract translation: 通过预燃燃料的方法改善了湿木废物，特别是锯木厂生成的猪肉燃料的总体热回收。 燃料的湿过大部分在流化床反应器中燃烧，提供热量，用于将剩余的较小尺寸的废物堆组分干燥至约10-30重量％的湿度。 燃烧的流化床的气态产物优选地与旋转干燥器中的燃料部分接触。 然后将干燥的燃料筛分成粗细和细分。 粗级部分进料到废木锅炉的炉排上。 在空气悬浮液中将细粉部分注入锅炉燃烧。 根据燃料的含水量，供给到流化床反应器的燃料的量为总燃料流量的10-25％。 供给到旋转干燥器的气体小于约1200°F，通过与最小外部空气结合来最小化“蓝色混浊”。