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一、问题的提出热水采暖比蒸汽采暖节约燃料,采暖质量好。近几年,许多锅炉厂把卧式水火管蒸汽锅炉改装设计为热水锅炉,许多用户也把这种蒸汽锅炉改为热水锅炉。但改装前由于研究讨论较少,改后的热水锅炉经过几个采暖期的运行便暴露了后管板高温区裂纹问题。是什么原因引起后管板裂纹,国内看法不一,有的认为是由于改为强迫循环,锅管后部工质流动缓慢,后管板内侧水接近于停滞引起;有的则认为改为自然循环,低负荷运行,受热面中水速太
First, the issue raised Hot water heating than steam heating fuel, heating good quality. In recent years, many boiler plants have converted horizontal water-steam tube steam boilers into hot water boilers, and many users have also changed such steam boilers to hot water boilers. However, due to the research before the modification less, after the reform of the hot water boiler after several heating operation will be exposed after the high temperature tube sheet cracking problems. What causes the tube plate cracks, the domestic view varies, and some think it is due to forced circulation, the slow flow of the back of the boiler tube, after the water inside the tube plate close to the stagnation caused; some are considered to be natural Circulation, low-load operation, heating surface water speed too