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Reliable and Economic Natural Gas Distributed Generation Technologies
Published in Albert Thumann, Scott Dunning, Plant Engineers and Managers Guide to Energy Conservation, 2020
Simple cycle gas turbines that are less than 20 MW are being improved upon in the Advanced Turbine Program. A gas turbine is a heat engine that uses a high-temperature, high-pressure gas as the working fluid. Part of the heat supplied by the gas is converted directly into the mechanical work of rotation. In most cases, hot gases reduced to operating a gas turbine are obtained by burning a fuel in air, which is why gas turbines are often referred to as “combustion” turbines. Because turbines are compact, lightweight, and simple to operate, gas turbines have been widely used in electricity generation. Gas turbines can be used in a cogeneration application in industrial and utility settings to produce electricity and steam. (Many industrial processes require steam in addition to electricity.) In such cases, “simple cycle” gas turbines convert a portion of input energy to electricity and use the remaining energy to produce steam in a steam generator.
Maintenance Policy Analysis of a Marine Power Generating Multi-state System
Published in Mangey Ram, Reliability Engineering, 2019
Thomas Markopoulos, Agapios N. Platis
There are three phases. The first phase is the journey phase that lasts on average 7 days when the vessel departs a port following a route to another one. During this phase, one primary generator provides the necessary level of power covering the needs of all operational systems. The port phase follows and lasts 3 days and takes place when the ship is in the port. The necessary machinery operates to charge or discharge cargo and to complete loading and unloading cargo processes according to the type of the ship and its cargo. Therefore, this phase is the most demanding one for power requirements and at least two primary generators are necessary for cargo handling. Finally, the maintenance phase follows the port phase and lasts two days. During this phase the engine crew conducts all necessary maintenance works, including both corrective (repairing generators that fail) and preventive maintenance (conducting inspections or overhaul maintenance). The maintenance refers to all four (or three) primary generators covering routine inspections with ad hoc repairs and overhaul maintenance according to the manufacturer’s maintenance plan.
Introduction
Published in Yogesh Jaluria, Design and Optimization of Thermal Systems, 2019
Most of the relevant systems in this area are thermal in nature. These include internal combustion engines such as spark ignition and diesel engines; steam engines; fuel cells; and modern automobile, airplane, and railway train engines.
Numerical analysis of travelling wave thermo-acoustic engine considering the wall Prandtl number
Published in International Journal of Ambient Energy, 2022
Mahesh Krishna Gaikwad, Pradeep A. Patil, Vikas Thate, Yogesh Jadhav, Shubham Chabukswar
Any device which can convert heat energy of fuel into mechanical energy is known as engine or heat engine. The thermo-acoustic engine uses a heat difference to induce high amplitude sound waves. Figure 1(a,b) shows the CAD model and schematic diagram with geometrical dimensions of travelling wave thermo-acoustic engine, respectively. The CAD model of travelling wave thermo-acoustic engine has developed in CATIA v5-6. The boundary conditions and analysis are carried out in ANSYS-Fluent. The engine assembly is divided into two parts; first, the core which include the main cold heat exchanger, regenerator, hot heat exchanger, TBT and the secondary cold heat exchanger. The second part consists of the feedback tube and the resonator. The dimensions of thermo-acoustic engine have shown in Table 1. The detailed CFD analysis is described in the following paragraphs.
Multi-parameter detection of 4 years and coupling analysis of lubricating oil for tugboat engine
Published in Ships and Offshore Structures, 2022
Geng-Shuo Liu, Xin-He Zhu, Cheng-Di Li, Yun-Yang Fu, Shao-Wei Shang, Zhuo-Kai Zhang
With the development of economic globalisation, the world economy continues to grow. Cargo throughput of major ports in the world is steadily increasing (Wada et al. 2021; Hamid 2021). Taking China's ports as an example, China's Ministry of Transport has released port cargo throughput data for 2020. The data show that the cargo throughput increased by 4.3%, and the container throughput increased by 1.2%. The running time of tugboat increases, which is bound to aggravate the wear of their engines. Timely maintenance can ensure friction pairs of engine in an excellent operating state, which contributes to reduce friction and wear, increases service life, improves work efficiency and reduces pollution emissions (Liu et al. 2011). Therefore, the maintenance of engine is important for tugboat.
Latest technologies and novel approaches in coal seam gas centrifugal compressor trains in Australia
Published in Australian Journal of Mechanical Engineering, 2019
A gas turbine is a heat engine using air as a working fluid to provide mechanical shaft work. To achieve this, the air passing through the engine has to be accelerated. This means that the velocity or kinetic energy of the air is increased. To obtain this increase, the pressure energy is first of all increased at an air compressor followed by the addition of heat energy before final conversion back to kinetic energy in the form of a high velocity jet efflux (Han, Dutta, and Ekkad 2000; Saravanamuttoo et al. 2009). In a gas turbine, combustion occurs at a more or less constant pressure, whereas in piston engines (many gas engines were employed previously in CSG fields), it occurs at a constant volume. In each case there is air intake, air compression, combustion and exhaust. These processes in a gas turbine occur continuously giving a much greater power output for the size of machine (Davey 2006; Rangwala 2005; Saravanamuttoo et al. 2009). The pressure of the air does not theoretically rise during combustion due to the continuous action of the gas turbine and the fact that the combustion chamber is not an enclosed space from the process point of view since flow continuously comes and goes. The lack of pressure fluctuations allows the use of low octane fuels (such as CSG) and light fabricated combustion chambers, in contrast to a piston engine (Davey 2006; Han, Dutta, and Ekkad 2000; Saravanamuttoo et al. 2009).