电热水锅炉厂家分析锅炉水循环故障

电热水锅炉厂家分析说自然循环的热水锅炉,当循环结构不合理或者运行不当时,容易出现循环停滞,循环倒流,汽水分层,下降管带汽的故障,下面就和大家一起分析探讨一下。
  
1、电热水锅炉厂家http://www.veamadrid.com/分析说循环停滞主要指在同一循环回路中,当并联的各个上升管受热不均匀时,受热弱的管中汽水混合物的密度,必然大于受热强的管找那个汽水混合物的密度,在下降管供水有限的情况下,受热弱的管内可能流速降低,甚至处于停止不动的状态,这种现象被称为循环停滞,这时候上升管内的蒸汽不能及时被携带走,造成管壁过热爆管事故。因此,锅炉的结构应尽量使得每根管子受热均匀;使得下降管向水冷壁管的配水均匀,以保证水循环的畅通。
Electric water boiler manufacturers analysis that mainly refers to the same cycle of stagnation in the circulation loop, when each rise in parallel uneven heating pipe, the density soda mixture heated tube weak, strong heat pipe must be greater than the density of the soda mixture to find, in the case of the downcomer limited water supply, heating may reduce the flow rate of weak inner tube, does not move even in a stopped state, a phenomenon known as cycle arrest, this time the steam rises in the tube are not adequately carried away, resulting in overheating of the tube wall tube rupture. Therefore, the structure of the boiler should try to make each tube heat evenly; making the drop to the water distribution pipes evenly water wall tube to ensure the smooth flow of the water cycle.
  
2、电热水锅炉厂家指出循环倒流是指当并联的各个上升管受热严重不均匀时,受热最强的管中汽水混合物上升力强,流速过大而产生抽吸作用,致使受热最弱的管中汽水混合物朝着与正常循环方向相反的方向流动,这种现象被称为循环倒流。如果当汽泡的上升速度与水的向下流动速度相等的时候,便会造成气泡停滞,形成“气塞”,造成气塞管段过热爆管。
Electric water boiler manufacturers pointed back loop refers to the various riser pipe heat when severe uneven parallel, heat pipe soda mixture strongest rise in power, the flow rate is too large to produce a pumping action, resulting in the weakest heat pipe soda mixture toward the direction opposite to the normal flow of circulation, a phenomenon known as loop back. If and when the bubble rise velocity of water flowing down the same speed, he will cause the bubble stagnation, the formation of "air lock", causing overheating airlock pipe burst pipes.  
  
3、电热水锅炉厂家谈到汽水分层是指当热水锅炉的水冷壁管水平或者接近水平布置,管中汽水混合物流速不高时,因为蒸汽比水要轻得多,蒸汽便在管子上部流动,水在管子下部流动,这种现象就被称为汽水分层,由于蒸汽的导热性能差,管子上部容易过热烧坏。因此,汽水混合物的上升管或者引出管不能水平布置,而且倾斜度一般不应小于15度。
Electric water boiler manufacturers talk about soda stratification refers to the level when the hot water boiler water wall tube or nearly horizontal layout, pipe soda mixture flow rate is not high, because the steam is much lighter than water, steam would flow in the upper part of the tube, water flow in the lower part of the tube, this phenomenon is called soda layered, due to the poor thermal conductivity of steam, the upper pipe burn easily overheat. Therefore, soda or a mixture of the riser pipe can not be drawn horizontally arranged, and generally should not be less than 15 degrees inclination. 
  
4、电热水锅炉厂家http://www.veamadrid.com/介绍下降管带汽指热水锅炉在正常运行时候,下降管中是不允许出现蒸汽的,否则,水要向下流,汽要向上浮,两者互相顶撞,既增加了流动阻力,又减少了循环流量,严重时会形成气塞,使得水循环停止,造成水冷壁管普遍缺水而烧坏。为此,下降管不宜受热,应接在锅筒的水空间,尽量接在锅筒的底部,并保证下降管入口与锅筒最低水位间的高度不小于下降管直径的四倍。以免将蒸汽带入管内。
Electric water boiler manufacturers introduced drop tube hot water boilers with steam means in normal operation when the drop tube steam is allowed, otherwise, would like dirty water, steam would like to go up, the two contradict each other, both to increase the flow resistance , but also reduce the circulation flow, severe form airlock, making water circulation stops, causing widespread water shortages and burn water wall tube. To this end, the downcomer should not be heated, should be connected to the water space of the drum, connected to the bottom of the drum as much as possible, and to ensure that the height of the downcomer inlet with the drum in the minimum water level is not less than four times the diameter of the downcomer. In order to avoid the steam into the tube.


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