EVALUASI EFEKTIVITAS ALAT HEAT EXCHANGER 11E-25 PADA KILANG FUEL OIL COMPLEX (FOC) I DI PT PERTAMINA RU-IV CILACAP

2021 ◽  
Vol 7 (2) ◽  
Keyword(s):  
Heat Exchanger ◽  
Fuel Oil

Modelling and Dynamics Analysis of Heat Exchanger as a Distributed Parameter Process

2004 ◽  
Author(s):  
B. Savic ◽  
D. Lj. Debeljkovic
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Heat Exchanger ◽  
Fuel Oil ◽  
Distributed Parameter ◽  
Dynamics Analysis ◽  
Real Process ◽  
Cooling Chamber ◽  
Constant Coefficients ◽  
Process Behavior

On the basis accepted and critically clarified assumptions, a non–linear and afterwards linearized mathematical model of fuel oil cooling chamber has been developed in engineering sense sufficiently correct. The model is in the form of set of partial differential equations with constant coefficients. Using the appropriate numerical simulation of the results derived, the dynamic of this process has been shown in the form of appropriate transient processes responses which quite well correspond to the real process behavior.

Integrity of Old Pipelines Buried in Petroleum Products Storage Terminals

2008 ◽  
Author(s):  
Mauro Y. Fujikawa ◽  
Eduardo O. de A. Silva ◽  
Reinaldo A. das Neves ◽  
Derci Donizeti Massitelli ◽  
Newton Orlando Abraha˜o ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Storage Tank ◽  
High Viscosity ◽  
Petroleum Products ◽  
The Other ◽  
Fuel Oil ◽  
Marine Fuel ◽  
Analysis Study ◽  
Theoretical Results

This work aims to present the results obtained from the experience gained through the accomplishment of the inspection with the ultrasonic umbilical pig in a non-piggable internal pipe buried in the Transpetro Storage Terminal in Sa˜o Caetano do Sul, in Sa˜o Paulo, Brazil. The pipeline considered in this work is a line for marine fuel oil, which, because of its high viscosity, must be heated in order to flow. The oil is heated in the terminal by the steam produced in boilers. The heat transfer may occur in a heat exchanger or inside the storage tank, and the pipeline referred is thermally isolated. So that the line could be inspected, it was divided in two parts, one upstream of the pumps (suction), which is a 12-inch line, and the other downstream of the same pumps (discharge), which is a 14-inch line. This work has been developed by Transpetro’s Pipeline Operation, Maintenance, Inspection and Safety Departments together, since the planning phase, passing by the job execution and getting to the conclusion. To begin with, the operational liberation of the line had to be agreed between all the departments involved with the PIG inspection, which were mentioned before, and Transpetro’s Logistics Department. Once the PIG passage was scheduled, an initial cleaning had to be performed by the Operation Activity. Since this line is non-piggable, the installation of adaptations was necessary. After that, the passage of cleaning PIGs was possible, and the line sections could be enabled. The next step was the inspection of the pipeline with umbilical ultrasonic PIGs. After the passage of these PIGs, the adaptations had to be removed and the pipeline had to be conditioned for the operational return. After this part of the inspection was finished, the verification of the results issued was necessary. Once the theoretical results were available, ditches were opened for correlation inspection and temporary repairs in the most critical points for the operation were applied. The last part of the work consists in an analysis study of technical and economical viability for rehabilitation of the lines.

scholarly journals A Low NOx Combustion System and a Ceramic Cross Flow Heat Exchanger for Small Gas Turbines

1987 ◽  
Author(s):  
Siegfried Förster ◽  
Peter Quell
Keyword(s):  
Heat Exchanger ◽  
Gas Turbines ◽  
Cross Flow ◽  
Fuel Oil ◽  
Actual State ◽  
Combustion System ◽  
Air Temperatures ◽  
Shaft Power ◽  
Flow Heat ◽  
Gas Turbine Cycle

A new low NOx oil-combustion system with superheated steam fuel evaporation prior to combustion has been found especially feasible for open cycle gas turbines with high turbine inlet temperatures and ceramic cross flow heat exchanger. The actual state of development of both the low NOx light fuel-oil combustion system and ceramic heat exchanger elements, especially the cross flow type, is outlined in this paper. The use of this combustion system results in considerably lower combustion temperatures in the primary combustion zone, reducing the NOx-production even at high air temperatures when the air is preheated in the heat exchanger. The water vapour used for the evaporation of the fuel oil before combustion has an improving effect on the cycle efficiency comparable to the Cheng-dual-fluid-cycle. Illustrative evaluations for a gas turbine cycle for a shaft power of 70 kW are given.

Transient Analysis of Aircraft Oil Supply System With Fuel-Oil Heat Exchangers During Abrupt Change in Engine Operating Modes

2021 ◽  
Author(s):  
Viktor Yevlakhov ◽  
Leonid Moroz ◽  
Andrii Khandrymailov ◽  
Yuriy Hyrka
Keyword(s):  
Heat Exchanger ◽  
Low Power ◽  
Thermal Management ◽  
Aircraft Engine ◽  
Supply System ◽  
Fuel Oil ◽  
Fuel System ◽  
Fuel Temperature ◽  
Oil Supply ◽  
Operating Modes

Abstract During different airplane flight modes, various effects may appear that need to be analyzed for both the oil and the fuel system at steady-state and transient operating modes. The effects, which relate to the cold temperature, associated with fuel freeze or wax point, cause a malfunction in the fuel pumps, nozzles, and other areas of the fuel system. On the other hand, high fuel temperature also leads to negative effects — the most common failure of high-flow fuel systems is cavitation, or “vapor-lock.” The combination of too much heat or too much inlet restriction can create this operating condition, where the liquid fuel literally boils inside the fuel pump. These effects are eliminated by the fuel/oil heat exchange system. In case of low fuel temperature, the fuel is used as a refrigerant to cool down hot oil coming from bearings. And in case of high fuel temperature, the oil serves as a coolant. This paper considers the method of evaluating normal and critical aircraft engine operation modes of the oil supply system with a fuel-oil heat exchanger utilizing an unsteady-state thermal-fluid network approach. The analyses are done based on the aircraft engine example to evaluate fuel and oil systems parameters variation in time under different flight conditions — the amount of fuel in the tank, inertial thermal effects, and the response time of the system to the regulation of the heat exchanger. The article is focused on sudden switching from a high to low gas engine operating mode. Fuel consumption to the engine is reduced abruptly, but the heat transfer from the bearings to the oil is still high due to thermal inertia. In this situation, a large amount of heated fuel must be returned to the fuel tank. At a certain point in time, the temperature of the fuel can reach a critical value. At the same time bearing cooling becomes ineffective, which leads to overheating. The calculation of thermal management system was performed at nominal conditions to obtain the initial data for low power settings analysis. As results of analysis at the low power settings mode the oil temperature before fuel cooled oil cooler is reached above 138 °C, which is high value. The failure of flow return valve is considered. The variations of oil temperature after the tank and increasing of fuel temperature at the tank in case of emergency situation are obtained. The influence of cooled fuel amount on the system thermal management is analyzed.

scholarly journals On possibility of replacement of saturated steam with hot water at circulating heating of fuel oil

2019 ◽  
Vol 140 ◽  
pp. 05005
Author(s):  
Valery Petrushchenkov ◽  
Michail Shcheglov
Keyword(s):  
Heat Exchanger ◽  
Initial Temperature ◽  
Thermal Capacity ◽  
Hot Water ◽  
Fuel Oil ◽  
Saturated Steam ◽  
Oil Consumption ◽  
Heating Water ◽  
Oil Flow ◽  
Oil Fuel

Circulating heating of fuel oil in railway tanks is performed, as a rule, with the help of saturated steam by preparing a heating flow of fuel oil with a temperature of about 80...90°C. For the operation services of fuel oil storages, it is interesting to consider replacing steam with hot water. The behavior of the existing system of circulating heating of fuel oil of M100 brand when changing the heating medium for the heater of fuel oil flow in the form of a plate heat exchanger is considered. The initial temperature of hot water is assumed to be equal to the design temperature of 115°C in the steam-fuel heat exchanger. The values of the thermal capacity of the heater flow of fuel oil, fuel oil consumption, flow rate and the temperature of the heating water flow at the outlet of the heat exchanger are defined depending on the temperature of the heated fuel oil in the range of 80...90°C. Reducing the temperature of fuel oil at the outlet of the heat exchanger from 90 to 80°C allows to increase its capacity by 30.1%, that is, to accelerate the heating of fuel oil in the tank and reduce the time of its discharge.

scholarly journals Exchange Rate Analysis for Ultra High Bypass Ratio Geared Turbofan Engines

2020 ◽  
Vol 10 (21) ◽  
pp. 7945
Author(s):  
Theoklis Nikolaidis ◽  
Soheil Jafari ◽  
David Bosak ◽  
Pericles Pilidis
Keyword(s):  
Heat Exchanger ◽  
Exchange Rates ◽  
Fuel Consumption ◽  
Thermal Management ◽  
Heat Exchangers ◽  
Pressure Loss ◽  
Specific Fuel Consumption ◽  
Fuel Oil ◽  
The Impact ◽  
Bypass Ratio

This paper investigates the impact of thermal management methods on the design point and synthesis exchange rates of an ultra-high bypass ratio geared turbofan engine. In a typical thermal management system, where heat is managed by means of heat exchangers that transfer engine waste heat into oil, air, or fuel. However, the utilization of air–oil and fuel–oil heat exchangers has an adverse impact on engine performance. This paper investigates the impact on and engine’s specific fuel consumption and summarizes it into common exchange rates for different thermal management configurations. The results show that any pressure loss in the bypass duct results in a severe specific fuel consumption penalty (an increase of 1% pressure loss in the bypass duct causes a 2% specific fuel consumption increase at cruise conditions). In addition, quite severe is the impact of extracting air from the gas path, particularly when the bleed location is in the bypass duct or the high-pressure compressor. It is also found that the utilization of a fuel–oil heat exchanger improves the specific fuel consumption at a higher rate than an air–oil heat exchanger. For the performance characteristics of the examined engine, the specific fuel consumption benefit with the former is 1.33%, while for the latter it is 0.38%.

Research on Welding Cracks Prevention in the Fuel-Lubricating Oil Heat Exchanger of Aeroengine

2011 ◽  
Vol 308-310 ◽  
pp. 1156-1161
Author(s):  
Kun Yu Yang ◽  
Xiao Jun Xu ◽  
Hong Yi Qu ◽  
Rui Lin Lai
Keyword(s):  
Heat Exchanger ◽  
Prevention Program ◽  
Shock Absorber ◽  
Oil Spills ◽  
Fuel Oil ◽  
Lubricating Oil ◽  
Flight Safety ◽  
Engine Fuel ◽  
Aero Engine ◽  
Two Measures

Cracks were occurred in welding lines at An Aero engine fuel - oil heat exchanger and oil spills were caused. But shortly, after welding cracks, cracks emerged again and severely threat to flight safety. To improve the overall damping by using new developed shock absorber, and alter the distribution and peak of stress at dangerous parts to prevent cracks by using a prevention program which consisting of two measures: vibration damping and partial damping treatment at the cracks particle which are prone to dangerous parts, were proposed in this paper and for analyze the damping effect, vibration test and compared were used. The results show that the prevention program can effect reduce the peak of stress at the risk of cracks particle which are prone to dangerous parts, and it is certain significant for how to repair and prevent the weld cracks at fuel - oil heat exchanger.

scholarly journals Not Even the Kitchen Sink

2004 ◽  
Vol 126 (08) ◽  
pp. 44-47
Author(s):  
Paul Sharke
Keyword(s):  
United States ◽  
Heat Exchanger ◽  
Combustion Chamber ◽  
Diesel Fuel ◽  
Capillary Force ◽  
Single Unit ◽  
The United States ◽  
Fuel Oil ◽  
Commercial Application ◽  
Fuel Use

This article focuses on the increasing commercial application of capillary force vaporization. Possibilities range from fuel oil burners to the sophisticated kerosene heaters that are popular in Japan. A new stove will introduce capillary force vaporizing as a way of atomizing fuel, stepping away from cartridge and metal-tank stoves that dominate the market. Researchers in the United States are also exploring the technology’s suitability to diesel and homogeneous charge compression (HCCI) ignition and engines. A capillary force vaporizer’s ability to vaporize low-volatility diesel fuel at atmospheric temperatures and pressures gives the technology an edge over air-assist or other methods that produce small droplets. A capillary force vaporizer could be applied to a Heel engine in the manifold between turbocharger and intake valves or a vaporizer could be installed in the combustion chamber itself. Jetboil Inc. of Guild, N.H., integrated a pot, burner, heat exchanger, canister, and insulator into a single unit to promote efficient fuel use. As a result, the stove uses less fuel in the field, which is about half that of a conventional pot-and-stove setup that lacks an engineered interface.

Indirect Firing of Gas Turbines by Residual Coal-Water Fuel

1985 ◽  
Author(s):  
Leon Green
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Gas Turbines ◽  
Fuel Oil ◽  
Residual Fuel Oil ◽  
Fluid Bed ◽  
Process Heat ◽  
Residual Coal ◽  
Low Sulfur Content ◽  
Low Sulfur

Production of low-ash, low-sulfur coal-water fuel (CWF) will yield large quantities of high-ash but still low-sulfur “residual” CWF analogous to the residual fuel oil produced by petroleum refining. Relatively low in cost compared to the premium, low-ash CWF product, “resid” CWF will thus be available for in-plant industrial generation of conventional steam power or process heat. Due to its low sulfur content, however, a higher-value use of such a compliance fuel can be the indirect firing of gas turbines for the more efficient combination of power generation plus subsequent bottoming-cycle use or process heat applications (cogeneration). To limit NOx emissions, staged combustion will be required. Such operation can be accomplished starting with substoichiometric CWF reaction in “conventional” slurry burners followed by final combustion completed in the bottom region of a deep, intensely-mixed, fludized-bed heat exchanger. By virtue of the highly enhanced heat-transfer characteristics of the strongly-stirred bed of non-reactive particles, the normal limitation of rates of non-pressurized fire-side heat transfer is elevated. The fuel ash particles, milled fine by passage through the bed of refractory heat-transfer particles, are collected in a conventional baghouse. The conceptual design of such a combustion-driven, fluid-bed heat exchanger system fired by high-ash, residual coal-water fuel is outlined and its advantages over a conventional fluid-bed, solid-coal combustor for indirect firing of gas turbines are enumerated.

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