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DEAERATOR

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November 4, 2010 inArticlesby daryono

Deaerator adalah peralatan yang digunakan untuk mengurangi kandungan gas terutama untuk

membatasi kandungan oksigen dalam air selama proses pembuatan uap dan pembangkitan listrik.

Hal ini dilakukan agar tidak menyebabkan terjadinya proses karat (korosi) dalam pipa-pipa baik pada

heat exchanger maupun boiler. Selain itu deaerator juga berfungsi sebagai pemanas yang pada

umumnya dengan cara kontak langsung dan fungsi penyimpanan air umpan boiler. Tangki

penyimpanan air umpan berbentuk silinder dengan ujung-ujungnya berbentuk hemispherical. Tangki

penyimpanan ini biasanya didesain dengan kapasitas setara dengan lima menit maksimum feed waterflow. Kapasitas ini berdasarkan pada level normal pada tangki tersebut. Air umpan dari Deaerator

dikumpulkan pada sprouts dan dialirkan pada kedua sisi vessel. Kemudian air mengalir ke bagian

suction feed water pump. Konstruksi deaerator terdiri dari deaerator-dome dan Feedwater tank

yang secara detail konstruksinya tergantung dari desain masing-masing fabrikator. Penempatan

Deaerator berada pada elevasi diatas pompa umpan boiler (Boiler Feed Pump) agar Net Positive

Suction Head (NPSH) terjadi secara maksimum.

Salah satu jenis Deaerator adalah jenis steamjet. Deaerator jenis ini diletakkan diatas tangki

penyimpanan air umpan (feedwater storage tank) yang dihubungkan dengan pipa. Air yang harus

dideaerasi dimasukkan ke deaerator melalui header yang terletak di bagian atas vessel. Bagian atas

deaerator adalahtray region. Air mengalir berlawana arah dengan arah uap setelah melewati tray

dengan susunan tertentu. Aliran air yang jatuh meninggalkan tray berlubang (perforated tray)

mempunyai rasio permukaan dengan volume besar, untuk membantu heat transfer dan menurunkan

difusi non condensable gas.

Bagian bawah deaerator adalah daerah steamjet. Uap diekspansi pada orifice dan air disemprotkan

untuk dikumpulkan pada suatu tempat. Disinilah bagian deaerasi yang mempunyaikoefisien heat

transfer yang paling efisien karena kondisi aliran yang turbulen.

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daryono

December 20, 2010 at 1:18 pm

Thank you for your comment, but I write my article in bahasa. Please write in bahasa.

Regards

Daryono

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