Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pulverized coal combustion process in annular lime kiln and application thereof
The invention relates to a pulverized coal combustion process in an annular lime kiln and application thereof. The process comprises the following steps: (1) anoxic ignition combustion of pulverized coal in a volute; (2) combustion of pulverized coal volatile matters in a combustion chamber; and (3) combustion of pulverized coal fixed carbon in a material bed. The process provided by the invention is used for calcining limestone. The process has the advantages that because of oxygen debt, the combustion temperature level and the combustion speed level are low, the combustion process is delayed, the NOx reaction rate is reduced in a reducing atmosphere, and the NOx yield in the area is inhibited; the circulating gas in the step (2) has large overall weight and high flow rate, the heat generated by combustion of volatile matters can be diluted and quickly transferred into a limestone material bed, the decreasing amplitude of the temperature of the combustion chamber is relatively large, and thus coal ash fusion nodulation and refractory material damage caused by accumulation of the heat in the combustion zone are avoided; and the burn-off rate of fixed carbon in the step (3) is improved, the content of CO in the tail gas is reduced to be 100-150mg/Nm<3>, and when the process provided by the invention is used for calcining limestone, the heat loss is reduced to 860kCal/kg from 930kCal/kg.
Pulverized coal combustion process in annular lime kiln and application thereof
The invention relates to a pulverized coal combustion process in an annular lime kiln and application thereof. The process comprises the following steps: (1) anoxic ignition combustion of pulverized coal in a volute; (2) combustion of pulverized coal volatile matters in a combustion chamber; and (3) combustion of pulverized coal fixed carbon in a material bed. The process provided by the invention is used for calcining limestone. The process has the advantages that because of oxygen debt, the combustion temperature level and the combustion speed level are low, the combustion process is delayed, the NOx reaction rate is reduced in a reducing atmosphere, and the NOx yield in the area is inhibited; the circulating gas in the step (2) has large overall weight and high flow rate, the heat generated by combustion of volatile matters can be diluted and quickly transferred into a limestone material bed, the decreasing amplitude of the temperature of the combustion chamber is relatively large, and thus coal ash fusion nodulation and refractory material damage caused by accumulation of the heat in the combustion zone are avoided; and the burn-off rate of fixed carbon in the step (3) is improved, the content of CO in the tail gas is reduced to be 100-150mg/Nm<3>, and when the process provided by the invention is used for calcining limestone, the heat loss is reduced to 860kCal/kg from 930kCal/kg.
Pulverized coal combustion process in annular lime kiln and application thereof
XU YU (Autor:in) / ZHANG XINSHENG (Autor:in) / CAO LINGYUN (Autor:in)
11.11.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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