卧式水烟管整装锅炉“汽改水”(见图1)后,结构上固有的后管板高、低温区温差大,造成热应力的不均;若“改水”方式不合理,锅筒底部和后管板附近水流还会出现停滞区;上述原因的复合作用, Horizontal hookah pipe after the boiler “steam to water ” (see Figure 1), the structural rear of the tube board is high, low temperature zone temperature difference, resulting in uneven thermal stress; Unreasonable, at the bottom of the drum and the tube plate near the water flow will appear stagnation zone; the combined effect of the above reasons,