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-640-140型锅炉原设计燃用褐煤(t_1=1060℃、t_2=1190℃、t_3=1200℃),配20万瓩的机组。根据燃料特性,锅炉为液态排渣,设有二只八角形的旋风预燃室。3-640-140型锅炉循环系统下降管的开始段采用较大的管径,借助加强的管接头与汽包连接。下降管为20号钢,外径465毫米,壁厚36毫米,垂直布置在锅炉前墙。水动力估算表明,为了保证自然循环系统的可靠工作,只要布置6根这样的管子就已足够。若采用φ219毫米的下降管,就至
-640-140 boiler was originally designed to consume lignite (t_1 = 1060 ℃, t_2 = 1190 ℃, t_3 = 1200 ℃) with 200,000 瓩 units. According to the fuel characteristics, the boiler is a liquid slagging, with two octagonal cyclone pre-combustion chambers. 3-640-140 Boiler Circulation System The beginning of the descending pipe with a larger diameter, with enhanced pipe fittings connected with the drum. The descending pipe is No. 20 steel, with an outer diameter of 465 mm and a wall thickness of 36 mm, arranged vertically in the front wall of the boiler. Hydrodynamic estimates show that in order to ensure reliable operation of the natural circulation system, it is sufficient to arrange only six such tubes. If using φ219 mm down tube, to