Abstract:
A process for reducing nitrogen monoxide emissions when burning solid fuels, in which the whole of the solid fuel is degassed prior to ignition in an output power combustion zone (2). At least one part of the gas obtained from degassing of the solid fuel is used as a reduction gas in one or several reduction zones (3) arranaged downstream of the power combustion zone (2). In a plant for performing the process, the installation for degassing the solid fuel is arranged as a degassing section(s) designed for a continuous throughflow of fuel and located inside the combustion chamber (1) in the flue gas flow.
Abstract:
The present invention discloses a method of, and apparatus for, reducing NOx emissions from black coal fired updraught furnaces (20). The pulverised coal is entrapped in the "primary air" and separated into two streams, one fuel rich (13) and one fuel lean (15). These streams are introduced into the furnace (20) via a corresponding burner(s) (14,16) with the burner(s) (16) for the fuel lean stream (15) being located at an elevation above the burner(s) (14) for the fuel rich stream (13). The apparatus comprises a concentrator (3) positioned between the substantially conventional mill (1) and furnace (20) and arranged to split the primary air and entrapped fuel into the two abovementioned streams. The concentrator preferably includes a classifier (8) and takes the form of a swirl generator (5) and radially positioned outlets which make use of the action of centrifugal force on the "primary air" and entrapped coal particles to bring about the desired separation.
Abstract in simplified Chinese:本发明系关于当正常操作氧化剂或正常操作燃料的供应中断,或暂时减少时利用一燃烧设备持续燃烧的设备。把空气或富含氧的空气或氧及气态燃料或液态燃料或气态与液态燃料二者引进该燃烧设备代替该正常氧化剂-燃料混合物以引起燃烧并且维持熔炉中的加热程度。燃烧器能以下列9种点火型态之任一种来点火:空气-气体;空气-氧-气体;氧-气体;空气-油;空气-氧-油;氧-油;空气-油-气体;空气-氧-油-气体;氧-油-气体。
Abstract:
一種粉煤燃燒器,包括粉煤噴嘴,及與粉煤噴嘴成同心關係設置的次級和三級空氣噴嘴。火焰穩定環被設置於粉煤噴嘴的出口端。分離壁被設置於粉煤噴嘴內而將粉煤噴嘴內的通道分成兩通道。粉煤/空氣混合物平直流動通過兩通道,使得粉煤/空氣混合物的再循環流動形成於粉煤噴嘴的出口端附近。結果,增進粉煤的點火性及燃燒率,因而減少 N O x的排出量。
Abstract in simplified Chinese:一种粉煤燃烧器,包括粉煤喷嘴,及与粉煤喷嘴成同心关系设置的次级和三级空气喷嘴。火焰稳定环被设置于粉煤喷嘴的出口端。分离壁被设置于粉煤喷嘴内而将粉煤喷嘴内的信道分成两信道。粉煤/空气混合物平直流动通过两信道,使得粉煤/空气混合物的再循环流动形成于粉煤喷嘴的出口端附近。结果,增进粉煤的点火性及燃烧率,因而减少 N O x的排出量。
Abstract in simplified Chinese:本发明系关于一种燃烧设备,其包括具有多个燃烧区之燃烧室。第一风箱与第一燃烧区连通以馈入待馈入至该燃烧室中之燃料用于该燃料在该第一燃烧区内之初始燃烧。第二风箱具有与第二燃烧区连通之再燃烧器。该再燃烧器经组态以将燃料、试剂及待再循环至该第二燃烧区之烟道气之第一部分馈入至该第二燃烧区中来减少该设备之氮氧化物排放。第三风箱与第三燃烧区连通以将空气馈入至该第三燃烧区来完成燃烧进程。