Perancangan heat recovery boiler blowdown di PT. Nestle Indonesia kejayaan factory

Prakosa, Awan Wahyu (2015) Perancangan heat recovery boiler blowdown di PT. Nestle Indonesia kejayaan factory. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Boiler blowdown adalah proses pembuangan air dari boiler. Tujuannya adalah untuk mengendalikan air boiler terhadap parameter yang ditentukan antara lain untuk meminimalkan scale, corrosion, carryover, dan masalah khusus lainnya. Blowdown juga digunakan untuk menghapus endapan yang tidak diperlukan di dalam sistem dan juga sebagai pengontrol tekanan berlebih pada boiler. Endapan ini biasanya disebabkan oleh kontaminasi feedwater, internal precipitates secara kimiawi, atau melampaui batas kelarutan garam. Akibatnya beberapa air boiler akan dibuang (blowdown) dan diganti dengan feedwater yang baru. Untuk menjaga kualitas air umpan boiler selain dengan chemical treatment juga dengan menggunakan sistem blowdown, yang secara continuous dan intermittent air umpan tersebut dibuang untuk menjaga kualitas air umpan boiler. Adapun permasalahan yang timbul akibat system continuous blowdown adalah berupa terbuangnya energi kalor oleh fluida dalam jumlah besar tanpa adanya pemanfaatan kembali energi tersebut. System recovery design yang akan dilakukan adalah dengan penggunaan flash vessel untuk recovery flash steam yang terbuang saat blowdown dilakukan dan suatu sistem heat exchanger untuk recovery kalor yang terbuang dari water blowdown tersebut. Recovery flash steam tersebut dimanfaatkan lagi sebagai steam low pressure pada proses deaerasi pada air umpan (feed water tank), sedangkan recovery kalor dari water blowdown menggunakan heat exchanger akan dimanfaatkan lagi untuk pemanasan pada hot water return yang akan digunakan pada proses produksi. Hasil dari perancangan ini adalah untuk mendapatkan dimensi dari flash vessel dan shell and tube heat exchanger yang sesuai, sebagai heat recovery boiler blowdown di PT Nestle Indonesia Kejayan Factory. =============================================================================================================== Boiler blowdown is process water discharge from the boiler. The goal is to control the boiler water to the specified parameters, among others, to minimize the scale, corrosion, carryover, and other special problems. Blowdown is also used to remove sediment that is not required in the system as well as the excess pressure in the boiler controller. These deposits are usually caused by contamination of the feed water, internal chemical precipitates, or exceed the solubility limit of solubility of the salt. As a result some of the boiler water will be discharged (blowdown) and replaced with a new feed water. To maintain the quality of boiler feed water in addition to the chemical treatment also using blowdown system, which continues and i ntermittent feed water is discharged to maintain boiler feed water quality. The problems that arise are due to blowdown system continues today is in the form of heat energy is wasted by the large amount of fluid in the absence of the energy recovery. Design a system recovery to be done is to use a flash vessel for recovery of flash steam is wasted when blowdown is done and a system of heat exchangers for heat recovery is wasted from the blowdown water. Recovery of flash steam is used again as a low pressure steam in the dearation process the feed water (feed water tank), while the recovery of heat from blowdown water using heat exchangers will be used again for heating the hot water process that will be used in the production process. The results of this design is to get the dimensions of the flash vessel and shell and tube heat exchangers appropriate, as a heat recovery boiler blowdown at PT Nestle Indonesia Kejayan Factory.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 621.183 Pra p
Uncontrolled Keywords: heat recovery boiler blowdown, flash tank, heat exchanger, continuous blowdown
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Mr. Fandika aqsa
Date Deposited: 12 Jun 2017 02:14
Last Modified: 12 Jun 2017 02:14
URI: http://repository.its.ac.id/id/eprint/41581

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