改造中應注意的一些技術問題
　　?。?）高壓變頻調速凝結水泵運行時上水調整門打開，利用改變凝結水泵的轉速調節(jié)除氧器水位造成凝結水壓力較低，最大不超過2.8MPa。運行中凝結水壓力隨負荷降低而下降，為了保證其它設備所需凝結水的壓力，所以凝結水母管壓力低聯(lián)鎖值應重新整定，但不能太低。例如設定變頻調速系統(tǒng)的最低轉速為30Hz（變頻器最低轉速設為750r/min）。
　　?。?）變頻凝結水泵變頻運行時，凝結水至除氧器副調節(jié)閥全開，主調節(jié)閥全關，所以凝結水母管壓力最低低至0.85MPa。為了保證定速凝結水泵低水壓不動作（工頻運行時定值為1.8 MPa），將定值修改為低于0.6MPa，聯(lián)動備用泵，母管壓力0.7 MPa時熱控光字牌報警。變頻器跳閘，系統(tǒng)發(fā)出12s脈沖信號，將除氧器水位總手操指令由50％減至20％，對應副調節(jié)閥開度約在43％左右，其它熱控保護不變。
Some technical problems should be noted in the reconstruction :
[1]High-pressure condensate pump run-time frequency control to adjust the door open when Sheung Shui. Condensate pump by changing the speed of adjustment deaerator water level caused by low pressure condensate. Sizing system is responsible for paper machine pulp through the pump, red pump, multi-level screen and other equipment delivered to the paper machine headbox, wire part of the process, in which pump and the red pump is the most important devices because they relate to the forming of paper quality, especially weight, frequency control must be used to achieve the paper machine Design Requirements. Practice shows that installation of variable frequency device can adapt to different speeds, different varieties of the amount of change, so that pump operation is always in high group status. In addition, the use of frequency control, motor and pump speed down, lower bearing and other mechanical components wear, the pump-side sealing system difficult to damage, pump failure rate greatly reduced the maintenance workload reduced.