Lesson13MarineBoilersandTheirConstruction题库.pptVIP

In the boiler shown in Fig. 13-3, the furnace is fully water-cooled and of monowall（单壁，整体） construction, which is produced from（由...得到） finned tubes（翅片管） welded together to form a gastight casing（气密外壳）. 在图13-3所示的锅炉中，炉膛全部被水冷却，并且是整体式结构，这是由翅片管焊接在一起以形成气密外壳而得到。 With monowall construction no refractory material（耐火材料） is necessary in the furnace. 在整体式（水冷壁）结构（的锅炉）中，炉膛内不需要耐火材料。 1-汽包[Steam Drum] 2-水筒[Water Drum] 3-联箱(header) 4-炉膛(furnace) 5-水冷壁(water wall) 6、7-蒸发管束(generating tubes) 8-联箱供水管(feed water tube of header) 9-水筒供水管(feed water tube of water drum) 10-燃烧器[Burner] 11-过热器super heater 12-经济器economiser The furnace side, floor and roof tubes（炉顶管） are welded into the steam and water drums. 炉膛侧面、炉底管和炉顶管分别焊接到汽锅筒和水锅筒上。 The front and rear walls（后壁） are connected at other end（在另一端） to upper and lower waterwall headers（水冷壁联箱）. 在另一端，前后壁连接到上下水冷壁联箱上。 The lower waterwall headers（水冷壁联箱） are connected by external downcomers（下降管） from the steam drum（汽锅筒） and the upper waterwall headers（水冷壁联箱） are connected to the steam drum by riser tubes（上升管）. 外部的下降管从汽锅筒连接到下水冷壁联箱，而且上升管将上水冷壁联箱连接到汽锅筒上。 The gases leaving the furnace pass through screen tubes（挡板管） which are arranged to permit flow between them. 离开炉膛的烟气流经挡板管，它被布置成允许烟气在它们之间流过。 The large number of tubes results in（引起） considerable（相当多的） heat transfer（热交换） before the gases reach the secondary superheater（二级过热器）. 烟气在到达二级过热器前，大量挡板管引起相当多的（良好）热交换。 The gases then flow over the primary superheater（一级过热器） and the economiser（经济器） before passing to exhaust. 然后，烟气在排出之前流向一级过热器和经济器。 The dry pipe（干汽管，过热蒸汽输送管） is located in the steam drum to obtain reasonably（适当地） dry saturated steam（干燥的饱和蒸汽） from the boiler. 过热蒸汽输送管布置在汽锅筒内以便从锅炉中获得适当干燥的饱和蒸汽。 This is then passed to the primary superheater and then to the secondary superheater. 然后通向一级过热器、二级过热器。 Steam temperature control is achieved（实现） by the use of an attemperator（调温器）, located in the steam drum, operating（起作用） between the primary and secondary superheaters. 通过使用调温器来实现蒸汽温度控制，而调温器安装在汽锅筒内，在一级过热器和二级过热器之