改造中應(yīng)注意的一些技術(shù)問題
　　?。?）高壓變頻調(diào)速凝結(jié)水泵運(yùn)行時(shí)上水調(diào)整門打開，利用改變凝結(jié)水泵的轉(zhuǎn)速調(diào)節(jié)除氧器水位造成凝結(jié)水壓力較低，最大不超過2.8MPa。運(yùn)行中凝結(jié)水壓力隨負(fù)荷降低而下降，為了保證其它設(shè)備所需凝結(jié)水的壓力，所以凝結(jié)水母管壓力低聯(lián)鎖值應(yīng)重新整定，但不能太低。例如設(shè)定變頻調(diào)速系統(tǒng)的最低轉(zhuǎn)速為30Hz（變頻器最低轉(zhuǎn)速設(shè)為750r/min）。
　　　（2）變頻凝結(jié)水泵變頻運(yùn)行時(shí)，凝結(jié)水至除氧器副調(diào)節(jié)閥全開，主調(diào)節(jié)閥全關(guān)，所以凝結(jié)水母管壓力最低低至0.85MPa。為了保證定速凝結(jié)水泵低水壓不動(dòng)作（工頻運(yùn)行時(shí)定值為1.8 MPa），將定值修改為低于0.6MPa，聯(lián)動(dòng)備用泵，母管壓力0.7 MPa時(shí)熱控光字牌報(bào)警。變頻器跳閘，系統(tǒng)發(fā)出12s脈沖信號(hào)，將除氧器水位總手操指令由50％減至20％，對應(yīng)副調(diào)節(jié)閥開度約在43％左右，其它熱控保護(hù)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.