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  • 淨化工程中的變頻器控製係統的使用
    來源:http://www.relexus.com 瀏覽: 發布日期:2020-12-21
    1.保護發電機,以確保淨化設備的安全可靠運行。
    1. Protect the generator to ensure the safe and reliable operation of the purification equipment.
    淨化工程的階段有3套過程設備。主電源使用3台天然氣發電機組。共3×1 840 kW,2用1備。1台發電機組接在Ⅰ段母線上,2台發電機組接在Ⅱ段母線上。當1台發電機組因故停止供電,淨化工程配電裝置有一段母線失電,該段母線所供負荷有可能是2套裝置的負荷,為了使2套裝置不因發電機故障而停產,接在該段母線上的MDEA循環泵、再生塔回流泵、TEG循環泵同時自啟動,在這瞬間隻有1台發電機組運行(備用發電機組還未啟動正常運行),帶一段母線的正常負荷和另一段母線同時自啟動的負荷。
    There are three sets of process equipment in the first stage of the purification project. Three natural gas generating sets are used for the main power supply. A total of 3 × 1 840 kW, 2 for use and 1 for standby. One generator set is connected to section I bus, and two generator sets are connected to Section II bus. When one generator unit stops power supply for some reason, a section of bus bar of power distribution device of purification project loses power, and the load supplied by this section of bus may be the load of two sets of devices. In order to make the two sets of devices stop production due to generator failure, MDEA circulating pump, regeneration tower reflux pump and TEG circulating pump connected to the bus bar will start automatically at the same time. At this moment, only one generator set is in operation (standby generator set) The normal load with one section of bus and the load of self starting of another bus at the same time.
    經計算,這瞬間發電機組能承受的大衝擊電流為2 957A,而此時廠內瞬間衝擊電流達3772 A,必然會導致發電機組全部甩負荷,進而迫使全廠停產。淨化工程中,采用變頻器後,全廠衝擊電流降至1 768 A,這樣一期工程時3台發電機組可以滿足要求。
    According to the calculation, the maximum impulse current that the generator set can bear is 2957a, while the instantaneous impulse current in the plant is 3772 a, which will inevitably lead to load rejection of all generating units and force the whole plant to stop production. In the purification project, after using frequency converter, the impulse current of the whole plant is reduced to 1768 a, so that three generating units can meet the requirements in the first phase project.
    淨化工程
    Purification engineering
    2.控製、接線係統優化
    2. Optimization of control and wiring system
    空氣淨化工程
    在淨化工程設計選用了變頻器,變頻器的特點在於有良好的人機介麵,LCD顯示,安裝方便,操作簡單。顯示麵板可以直接顯示變頻器的輸出電壓、電流和頻率以及電機運行消耗的能量、運行時間等。其淨化工程控製係統是基於變頻器的特殊控製程序進行控製的,具有工頻和變頻操作的方式,且這兩種操作方式互鎖,並相互獨立;能詳細、準確地反應變頻器工況。:上述接線設計有以下特點:
    In the purification project design, the frequency converter is selected. The characteristics of the frequency converter are good man-machine interface, LCD display, convenient installation and simple operation. The display panel can directly display the output voltage, current and frequency of the inverter, as well as the energy consumed by motor operation, operation time, etc. The purification engineering control system is controlled based on the special control program of frequency converter, with power frequency and frequency conversion operation mode, and the two operation modes are interlocked and independent of each other; it can reflect the working condition of frequency converter in detail and accurately. The above wiring design has the following features:
    a)變頻器加裝接觸器作旁路,提高了供電的可靠性。
    a) The frequency converter is equipped with contactor as bypass, which improves the reliability of power supply.
    b)變頻器采用手動、自動啟動兩種方式,可通過轉換開關來切換、選擇。淨化工程中,參與自啟動的泵可以分批自啟動,不僅可以減小啟動電流,而且還可以避免雙電源切換時,工藝裝置重新開車。
    b) The frequency converter adopts manual and automatic starting modes, which can be switched and selected by the transfer switch. In the purification project, the pumps participating in the self starting can start automatically in batches, which can not only reduce the starting current, but also avoid the process unit restart when the dual power supply is switched.
    c)變頻器運行方式可開環運行,也可閉環運行。開環運行時,采用手動調節電位器。在淨化工程設計中,考慮到場地天然氣處理規模較大,重要性十分突出,初期就采用這種新的控製係統,還沒有實踐經驗。
    c) The operation mode of frequency converter can be open-loop or closed-loop. In open-loop operation, the potentiometer is adjusted manually. In the design of purification project, considering the large scale of natural gas treatment on site and its importance is very prominent, this new control system has been adopted in the initial stage, and there is no practical experience.
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