18+电影在线观看,100篇香艳短篇小说,在线小说我七个姐姐绝世无双,亲戚交换乱小说txt,春日小说免费阅读,新金瓶龚玥菲什么时候上映,成人影片一区免费观看,武王小说网两性小说,秘爱韩剧电影

二、 Classified by structure

1. Fire tube boiler: flue gas flows through the fire tube, generally small capacity, low parameter boiler, low thermal efficiency, but simple structure, low water quality requirements, convenient operation and maintenance; 2. water tube boiler: steam water flows through the tube, can It can be made into a small-capacity, low-parameter boiler, and can also be made into a large-capacity, high-parameter boiler. Power station boilers are generally water tube boilers with high thermal efficiency, but also have high requirements on water quality and operating level.