scholarly journals Perencanaan Pipa Dua Fasa pada Fasilitas Produksi Panas Bumi Dieng

2019 ◽  
Vol 3 (1) ◽  
pp. 36
Author(s):  
Ady Setya Nugroho
Keyword(s):  
Pressure Drop ◽  
Geothermal Field ◽  
Pipe Diameter ◽  
Steam Quality ◽  
Two Phase ◽  
Field Development ◽  
Calculation Results ◽  
Steam Parameters ◽  
Turbine Capacity

<p><span><span><span>Lapangan Panas Bumi Dieng beroperasi sejak tahun 2004 dengan kapasitas turbin 60 MW serta memiliki target produksi sebesar 55 MW selama tigapuluh tahun. Lapangan ini, masih layak untuk dilakukan pengembangan dengan total sebesar 110 MW. Dalam mengoptimalkan kualitas uap (<em>steam quality</em>) dari kepala sumur sampai dengan input turbin maka perlu adanya perencanan mengenai dimensi dari pipa yang mengalirkan uap. Parameter yang diperhatikan dalam perencanaan pipa dua fasa yaitu diameter pipa dan penurunan tekanan. Tujuan penelitian adalah menentukan diameter pipa dua fasa dan penurunan tekanan pada salah satu sumur pengembangan lapangan Panas Bumi Dieng. Metodologi perhitungan dimensi pipa ini menggunakan standar ASME dalam penentuan diameter pipa dan menghitung besarnya penurunan tekanan sebelum input turbin menggunakan <em>software pipesim. </em>Hasil perhitungan salah satu sumur yang memiliki masa aliran sebesar 60 kg/s <span> </span>didapatkan jenis pipa Xtra Strong (XS) kualitas uap 0.176 dengan diameter pipa 8 inchi serta kecepatan aliran yang optimal sebesar 27.33 m/s <span> </span>serta penurunan tekanan dari <em>well head</em> menuju separator adalah 7, 476 bar dengan tekanan input turbin sebesar 22,985 bar.</span></span></span></p><p><em>Dieng Geothermal Field operates since 2004 with a 60 MW turbine capacity and has a production target of 55 MW for thirty years. This field is still feasible for development with a total of 110 MW. In optimizing the quality of steam (steam quality) from the wellhead to the turbine input, it is necessary to plan on the dimensions of the pipe that flows steam. Parameters that are considered in planning two-phase pipes are pipe diameter and pressure drop. The research objective was to determine the two-phase pipe diameter and pressure drop at one of the wells in the Dieng Geothermal field development. The methodology for calculating the pipe dimensions uses the ASME standard in determining pipe diameter and calculating the amount of pressure drop before the turbine input using pipesim software. The calculation results of one well that has a flow period of 60 kg / s obtained Xtra Strong (XS) pipe type vapor quality 0.176 with 8 inches pipe diameter and optimal flow velocity of 27.33 m / s and pressure drop from well head to separator is 7 , 476 bars with turbine input pressure of 22,985 bars.</em></p>

scholarly journals Onset of intermittent flow: Visualization of flow structures

2021 ◽  
Vol 76 ◽  
pp. 27
Author(s):  
Abderraouf Arabi ◽  
Yacine Salhi ◽  
Amina Bouderbal ◽  
Youcef Zenati ◽  
El-Khider Si-Ahmed ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Flow Visualization ◽  
Two Phase Flow ◽  
Plug Flow ◽  
Superficial Velocity ◽  
Pipe Diameter ◽  
Flow Structures ◽  
Intermittent Flow ◽  
Phase Flow ◽  
Two Phase

The transition from stratified to intermittent air-water two-phase flow was investigated experimentally, by flow visualization and pressure drop signals analyses, in a 30 mm ID pipe. The intermittent flow’s onset was found to be mainly dependent on the liquid superficial velocity and the pipe diameter. Plug flow, Less Aerated Slug (LAS) or Highly Aerated Slug (HAS) flows could be obtained on the gas superficial velocity grounds. The available models, compared to experiments, could not predict adequately the intermittent flow onset. The appearance of liquid slugs was revealed by peaks in the pressure drop signal. Furthermore, it was shown that the available slug frequency correlations were not valid in the zone of the onset of intermittent flow.

scholarly journals Hydrodynamic studies in two - phase stirred fluidized bed with three types of impellers

2020 ◽  
pp. 29-29
Author(s):  
Priya Deepa ◽  
K. Saravanan
Keyword(s):  
Pressure Drop ◽  
Fluidized Bed ◽  
Water System ◽  
Stirrer Speed ◽  
Gas Velocity ◽  
Two Phase ◽  
Process Industries ◽  
Mechanical Stirring ◽  
Wide Range

Fluidized beds are extensively used in petrochemical, chemical process industries, pharmaceutical, food and biotechnology industries. They are preferred to process materials with wide range of particle size distribution and offer even temperature distribution and excellent heat and mass transfer. To improve the quality of fluidized bed, mechanical stirring can be employed along with aeration. Hence, an attempt was made to study the hydrodynamics of stirred fluidized bed using air-water system. The characteristics of the fluidized bed can be well understood by studying its hydrodynamics. Pressure drop is one of the vital factor which affects the performance of fluidized bed. Hence, the effects of gas velocity and stirrer speed on pressure drop and power were studied for both stirred and unstirred bed conditions. It was observed that pressure drop and power increases with increase in gas velocity and stirrer speed. Also, the pressure drop and power is low for the stirred bed condition than the unstirred bed condition.

Measurement of Steam Quality in Two-Phase Upflow With Venturimeters and Orifice Plates

1971 ◽  
Vol 93 (1) ◽  
pp. 11-20 ◽  
Author(s):  
D. B. Collins ◽  
M. Gacesa
Keyword(s):  
Orifice Plate ◽  
Pipe Diameter ◽  
Explicit Calculation ◽  
Experimental Program ◽  
Total Flow ◽  
Steam Quality ◽  
Two Phase ◽  
Flow Rates ◽  
Experimental Parameters ◽  
Pipe Size

An experimental program has been carried out to investigate the measurement of steam quality with Herschel venturimeters and orifice plates. Data are presented for vertical upflow of steam/water mixtures at 980 psia, through venturimeters and orifice plates of 2 1/2-in. and 3-in. pipe size and with four throat-to-pipe diameter ratios. Total flow rates ranged between 15,000 and 100,000 lb/hr and steam qualities between 5 and 90 percent. The data have been correlated in a manner enabling explicit calculation of steam quality, from measurements of other experimental parameters. Comparison with other data shows that the orifice plate correlation may be used to calculate steam qualities in the range of operating pressures 70–980 psia and in pipe sizes from 2 1/2 to 8 in.

Pressure Drop for Oil-Gas Two-Phase Flow Through Straight Horizontal Pipe

2007 ◽  
Author(s):  
Wenhong Liu ◽  
Liejin Guo ◽  
Ximin Zhang ◽  
Kai Lin ◽  
Long Yang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Flow Through ◽  
Oil Gas

Driving Torsion Scans with Wavefront Propagation

2020 ◽  
Author(s):  
Yudong Qiu ◽  
Daniel Smith ◽  
Chaya Stern ◽  
mudong feng ◽  
Lee-Ping Wang
Keyword(s):  
Potential Energy ◽  
Force Field ◽  
Degrees Of Freedom ◽  
Computational Cost ◽  
Initial Guess ◽  
Field Development ◽  
Force Field Development ◽  
Wavefront Propagation ◽  
Open Source Software Package

<div>The parameterization of torsional / dihedral angle potential energy terms is a crucial part of developing molecular mechanics force fields.</div><div>Quantum mechanical (QM) methods are often used to provide samples of the potential energy surface (PES) for fitting the empirical parameters in these force field terms.</div><div>To ensure that the sampled molecular configurations are thermodynamically feasible, constrained QM geometry optimizations are typically carried out, which relax the orthogonal degrees of freedom while fixing the target torsion angle(s) on a grid of values.</div><div>However, the quality of results and computational cost are affected by various factors on a non-trivial PES, such as dependence on the chosen scan direction and the lack of efficient approaches to integrate results started from multiple initial guesses.</div><div>In this paper we propose a systematic and versatile workflow called \textit{TorsionDrive} to generate energy-minimized structures on a grid of torsion constraints by means of a recursive wavefront propagation algorithm, which resolves the deficiencies of conventional scanning approaches and generates higher quality QM data for force field development.</div><div>The capabilities of our method are presented for multi-dimensional scans and multiple initial guess structures, and an integration with the MolSSI QCArchive distributed computing ecosystem is described.</div><div>The method is implemented in an open-source software package that is compatible with many QM software packages and energy minimization codes.</div>

Sign in / Sign up

Export Citation Format

Share Document