lubrication of gas turbines

... selection and the sizing of the optimum steam turbine to be integrated in various capacities of CSP plants For the purpose of this analysis, the Steam Pro software module of the Thermoflow Suite 18 package ... capacity sizes of CSP plants, as well as the estimation of efficiency and expected capital cost of the power block for various steam turbine capacities is carried out The cost of electricity of CSP plants ... plants) offer an alternative method of exploiting the energy from the sun in a solar thermal power plant In this case the collector field consists of an array of heliostats (mirrors) at the centre of...

Ngày tải lên: 05/09/2013, 14:59

... Calorific Value of coal = 14840 kJ/kg Carbon fraction of coal = 0.849948 Carbon fraction of natural gas = 0.75 Combustion efficiency of coal = 26% Combustion efficiency of natural gas = 80% Gas Turbine: ... HRSG, mg is the mass of gas (kg), hg is the enthalpy of gas at the inlet to the HRSG (kJ/kg), hstk is the enthalpy of gas at the stack conditions (kJ/kg), ms is the mass of steam generated in ... the work loss factor due to mixing of cooling air with hot ( gas in the gas turbine, hgt , g ) in ( and hgt , g ) out is the enthalpy of gas in and out of the gas turbine (kJ/kg), respectively...

Ngày tải lên: 05/09/2013, 15:28

... plenum downstream of the compressor discharge diffuser (upstream of the combustor) divided by the total pressure downstream of the inlet filter and upstream of the inlet of the gas turbine Similarly, ... compare the technology level of competing gas turbines, it is important to compare on one definition of this parameter Aircraft engines and aircraft-derivative industrial gas turbines have other definitions ... increases the power produced by a gas turbine of a given physical size and mass flow The pursuit of higher firing temperatures by all manufacturers of large, heavy-duty gas turbines used for electrical...

Ngày tải lên: 18/10/2013, 10:15

... coefficient total conformity of ball bearing semiminor axis of contact, m; width of pad, m length ratio, bslbr length of feed groove region, m length of ridge region, m length of step region, m dynamic ... m bore diameter of ball bearing, m diameter of capillary tube, m inner-race diameter of ball bearing, m outer-race diameter of ball bearing, m diameter of orifice, m modulus of elasticity, NYm2 ... components of low conformity There are two distinct forms of elastohydrodynamic lubrication (EHL) Hard EHL Hard EHL relates to materials of high elastic modulus, such as metals In this form of lubrication...

Ngày tải lên: 27/01/2014, 16:20

... 21.2.4 Gas- Lubricated Hydrodynamic Bearings A relatively recent (within the last 30 years) extension of hydrodynamic lubrication that is of growing importance is gas lubrication It consists of using ... hydrodynamic lubrication process." Elastohydrodynamic lubrication implies complete fluid-film lubrication and no asperity interaction of the surfaces There are two distinct forms of elastohydrodynamic lubrication ... bearing the minimum value of Hf occurs at a ratio of recess radius to bearing radius R0IR of 0.53 All bearing-pad configurations exhibit minimum values of Hf when their ratios of recess length to bearing...

Ngày tải lên: 27/01/2014, 16:20

... investigations of many practical lubrication problems involving elliptical conjunctions Fig 21.72 Map of lubrication regimes for ellipticity parameter k of (From Ref 44.) Fig 21.73 Map of lubrication ... complete spectrum of lubrication regimes, ranging from boundary to hydrodynamic A way of coming to an understanding of elastohydrodynamic lubrication is to compare it to hydrodynamic lubrication The ... lubrication presents one of the major developments in the field of tribology in this century The revelation of a previously unsuspected regime of lubrication is clearly an event of importance in tribology...

Ngày tải lên: 27/01/2014, 16:20

... and gas turbines Both modes found favour in warships, however, and aero-derived gas turbines have recently secured firm niches in fast ferry and cruise tonnage A stronger challenge from gas turbines ... take the case of an engine producing a (brake) output of 10 000 kW for an hour using 2000 kg of fuel per hour having an LCV of 42 000 kJ/kg POUNDER’S MARINE DIESEL ENGINES AND GAS TURBINES (Brake) ... diameter of each of the meshing gears If the pitch circle diameters of the input and output gears are respectively = 14 POUNDER’S MARINE DIESEL ENGINES AND GAS TURBINES d1 and d and the speeds of the...

Ngày tải lên: 13/02/2014, 16:20

... has two atoms of hydrogen and one of oxygen combined together Similarly, methane gas, which forms the main part of natural gas, is made up of one atoms of carbon and four atoms of hydrogen So ... characteristics of the fuel and the way it burns Table 1.4 below provides the comparison of properties of typical gases Table 1.4 Comparison of Properties of Typical Gases Natural Gas Commercial ... between the number of molecules and the volume of gases, the equation shows the volumes of gases involved So, FIGURE 2.4 Combustion of methane 18 Combustion FIGURE 2.5 The volumes of gases involved...

Ngày tải lên: 16/02/2014, 07:20

... analysis The analysis of the microarray results presented in Table required the use of an arbitrary ‘cut-off’ value for level of gene expression, an approach that introduces an element of bias into the ... expression profile of cells expressing the VV-II mutant form of STAT2 was more similar to that of U6A cells than that of U6A-2 cells (Level 1) IFN treatment led to the further segregation of the sample ... number of genes in U6A and U6A-2 cells, IFN-treated U6A-VV-II cells showed the down-regulation of a substantially larger subset of genes Identification and characterization of a subset of ISGF3-independent...

Ngày tải lên: 19/02/2014, 07:20

... hence the rate of accumulation of component i in V is Rate of change of d moles of compo- = dt nent i in V np φ V xij ρj Sj dV (2.1.5) j=1 Convection Terms Part of the accumulation of component ... of the porous medium bounded by a surface, S(t) A material balance on component i in the control volume can be stated as Rate of change of amount of component i in V (t) = Net rate of inflow of ... in the presentation of the important ideas Much of the material in this book that describes flow of gas/ oil mixtures follows from the work of an exceptionally talented group of graduate students:...

Ngày tải lên: 05/03/2014, 18:20

... definition (final value of N)t+ dN ≡ lim t→0 dt − (initial value of N)t t t (2.13) where the final value of N is the N of regions and computed at time t + the initial value of N is the N of regions and ... this form of the continuity equation in several future derivations 2.6 CONSERVATION OF ENERGY The first law of thermodynamics is a statement of conservation of energy For a system composed of a given ... variety of practical engineering problems can be solved with these concepts, and many of these problems are covered throughout the text Examples of these are the off-design operation of supersonic...

Ngày tải lên: 17/03/2014, 14:01

... Technology Characterization Gas Turbines Gas turbines need minimum gas pressure of about 100 psig for the smallest turbines with substantially higher pressures for larger turbines and aeroderivative ... determine gas turbine exhaust temperature Typically aeroderivative gas turbines have higher firing temperatures than industrial gas turbines, but when the higher pressure ratio of aeroderative gas turbines ... need for shutdown Estimated availability of gas turbines operating on clean gaseous fuels, like natural gas, is in excess of 95 percent Emissions Gas turbines are among the cleanest fossil-fueled...

Ngày tải lên: 18/03/2014, 02:20

... insulating grains The ratio of the slopes of straight lines, A/B, gives the ratio of reaction rate constants (k2 ) of H2 and CO; k2 of H2 is analyzed to be 14 times as large as that of CO Similar H2 response ... processing of materials toward innovations of gas sensors Micro-platforms fabricated with MEMS techniques are almost ready to be used in gas sensors Excellent heating and cooling characteristics of them ... Theory of power laws for semiconductor gas sensors, Sens Actuators B: Chem 128 (2008) 566–573 [6] N Yamazoe, K Shimanoe, Roles of shape and size of component crystals in semiconductor gas sensor...

Ngày tải lên: 20/03/2014, 13:05

... by means of system, which consists of measuring camera, multimeter Keithley-2010 and PC Results and discussion The XPS-spectra of W4f- and O1s-levels of the samples and the results of their decomposition ... the results of decomposition of W4f-line in the annealed and non-annealed samples The maxima of peak couples correspond to W4f7/2 - and W4f5/2 -levels of tungsten atoms for W5+ -states of oxide ... surface of stoichiometric tungsten oxide is formed only of W6+ states of WO3 -phase (comps d-d , Fig 2-4) A signal from WO3 ·(OH2 )n is absent (comps e-e , Fig 2-4) The results of decomposition of...

Ngày tải lên: 20/03/2014, 13:12

... Technology Characterization Gas Turbines Gas turbines need minimum gas pressure of about 100 psig for the smallest turbines with substantially higher pressures for larger turbines and aeroderivative ... determine gas turbine exhaust temperature Typically aeroderivative gas turbines have higher firing temperatures than industrial gas turbines, but when the higher pressure ratio of aeroderative gas turbines ... need for shutdown Estimated availability of gas turbines operating on clean gaseous fuels, like natural gas, is in excess of 95 percent Emissions Gas turbines are among the cleanest fossil-fueled...

Ngày tải lên: 24/03/2014, 05:20

... development of new numerical methods for direct numerical simulations (DNS) of multiphase flows that have produced detailed studies and improved knowledge of multiphase flows While the origin of DNS of ... investigated a number of problems Pozrikidis and collaborators have examined several aspects of suspensions of droplets, starting with a study by Zhou and Pozrikidis (1993) of the suspension of a few two-dimensional ... in simulating certain types of solid gas multiphase flows, they are limited to a very small class of problems One could, however, argue that simulations of the motion of particles interacting through...

Ngày tải lên: 28/03/2014, 09:20

... 12 13 14 Properties of Gases Combustion Liquefied Petroleum Gas Burners Energy Pressure and Gas Flow Control of Pressure Measurement of Gas Basic Electricity Transfer of Heat Gas Controls Materials ... limits Natural gas with a CV of 39 33 MJ/m3 and a SG of 0.58 would have a Wobbe number of 51.64 PROPERTIES OF GASES Families of Gases To ensure that appliances operate correctly the gas quality ... natural gas is in the region of 0.5 So it is about half the weight of the same volume of air The specific gravity of LPG is greater than that of air 8 BASIC SCIENCE AND PRACTICE OF GAS SERVICE...

Ngày tải lên: 29/03/2014, 08:20

... ASPECTS OF GAS CHROMATOGRAPHY Applications of Gas Chromatography Gas chromatography is a unique and versatile technique In its initial stages of development it was applied to the analysis of gases ... solubilities) of the sample components between the two phases Gas- Sampling Valve A bypass injector permitting the introduction of a gaseous sample of a given volume into a gas chromatograph Gas Solid ... PRACTICE OF GAS CHROMATOGRAPHY FOURTH EDITION Edited by Robert L Grob, Ph.D Professor Emeritus, Analytical Chemistry, Villanova University Eugene F Barry, Ph.D Professor of Chemistry, University of...

Ngày tải lên: 29/03/2014, 14:20

... on the document of the Department of Energy of United States -7- Simulation of a Gas Power Plant Theoretical principles 1.1 Gas turbine The gas turbine (Brayton) cycle is one of the most efficient ... the values of the profit and the disturbances has been determined that have more effect on the profit: - 20 - Simulation of a Gas Power Plant Table 14 Results of the study of the effect of the disturbances ... Brayton cycle of the gas turbine with a low temperature moderate Rankine cycle, the heat of waste of the exit of the Brayton cycle it serves as entrance of heat to the Rankine cycle The gas turbine...

Ngày tải lên: 01/04/2014, 10:57