電熱水鍋爐廠家分析鍋爐水循環故障

電熱水鍋爐廠家分析說自然循環的熱水鍋爐,當循環結構不合理或者運行不當時,容易出現循環停滯,循環倒流,汽水分層,下降管帶汽的故障,下面就和大家一起分析探討一下。
  
1、電熱水鍋爐廠家http://www.nys3.com/分析說循環停滯主要指在同一循環回路中,當并聯的各個上升管受熱不均勻時,受熱弱的管中汽水混合物的密度,必然大于受熱強的管找那個汽水混合物的密度,在下降管供水有限的情況下,受熱弱的管內可能流速降低,甚至處于停止不動的狀態,這種現象被稱為循環停滯,這時候上升管內的蒸汽不能及時被攜帶走,造成管壁過熱爆管事故。因此,鍋爐的結構應盡量使得每根管子受熱均勻;使得下降管向水冷壁管的配水均勻,以保證水循環的暢通。
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、電熱水鍋爐廠家指出循環倒流是指當并聯的各個上升管受熱嚴重不均勻時,受熱最強的管中汽水混合物上升力強,流速過大而產生抽吸作用,致使受熱最弱的管中汽水混合物朝著與正常循環方向相反的方向流動,這種現象被稱為循環倒流。如果當汽泡的上升速度與水的向下流動速度相等的時候,便會造成氣泡停滯,形成“氣塞”,造成氣塞管段過熱爆管。
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、電熱水鍋爐廠家談到汽水分層是指當熱水鍋爐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時,因為蒸汽比水要輕得多,蒸汽便在管子上部流動,水在管子下部流動,這種現象就被稱為汽水分層,由于蒸汽的導熱性能差,管子上部容易過熱燒壞。因此,汽水混合物的上升管或者引出管不能水平布置,而且傾斜度一般不應小于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、電熱水鍋爐廠家http://www.nys3.com/介紹下降管帶汽指熱水鍋爐在正常運行時候,下降管中是不允許出現蒸汽的,否則,水要向下流,汽要向上浮,兩者互相頂撞,既增加了流動阻力,又減少了循環流量,嚴重時會形成氣塞,使得水循環停止,造成水冷壁管普遍缺水而燒壞。為此,下降管不宜受熱,應接在鍋筒的水空間,盡量接在鍋筒的底部,并保證下降管入口與鍋筒最低水位間的高度不小于下降管直徑的四倍。以免將蒸汽帶入管內。
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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