Wear and Compatibility Behavior of Liquid Metal Bearing Materials

1967 ◽  
Vol 89 (4) ◽  
pp. 466-472
Author(s):  
M. J. Wallace
Keyword(s):  
Power Plants ◽  
Wear Behavior ◽  
Development Program ◽  
Rotating Disk ◽  
Rankine Cycle ◽  
Cemented Carbides ◽  
Cycle Space ◽  
Bearing Materials ◽  
And Performance ◽  
Zr Alloy

The wear and compatibility characteristics of selected bearing materials, including surface coatings and cemented refractory carbides were investigated in support of a pump development program for advanced Rankine cycle space power plants employing high temperature lithium and NaK. Compatibility of candidate materials with 1100-deg lithium in Cb-1 Zr alloy was studied in tilting capsule tests for durations to 7000 hr. The wear behavior of material combinations was evaluated with a rotating disk-static shoe assembly in lithium and NaK to 1000 deg. The best compatibility and wear characteristics were exhibited by high density molybdenum cemented carbides. Carburized Cb-1 Zr alloy wear resistance was inconsistent but, under the best conditions, was nearly equivalent to that of the cemented carbides. Plasma sprayed coatings of tungsten carbide and WC-Co gave encouraging results in NaK, but additional development of the coating process appeared necessary to assure reliable control of adhesion and performance.

Fretting Wear Behavior of ZR-ALLOY in Na2SO4 Solution

2011 ◽  
Vol 239-242 ◽  
pp. 1633-1636
Author(s):  
Ji Wu Li ◽  
Jian Ying Shen
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Wear Behavior ◽  
Pure Water ◽  
Pulse Method ◽  
Fretting Wear ◽  
Measuring Instruments ◽  
Fretting Corrosion ◽  
The Coefficient Of Friction ◽  
Zr Alloy

Fuel rods in nuclear power plants, made of Zr-alloy is immersed in pure water, and surging of this coolant causes fretting for the rods and spacer. In this paper fretting wear and fretting corrosion test of the Zr-alloy against Al2O3 placed respectively in air, pure water and Na2SO4 solution is carried out. The lost volume is measured with 3D Measuring instruments and the relationship between the fresh surface fretting wear produces and lost surface is evaluated with the potential pulse method. The result shows that the fresh surfacing area is smaller than abrasion mark area, and bigger than actual contact area. The wear extent of Zr-alloy against Al2O3 in Na2SO4 solution is ten times higher than that in air and pure water, but the coefficient of friction is smaller. The wear extent of Zr- alloy against Al2O3 in pure water is equal to the numeric value of the Zr-alloy against Al2O3 in Na2SO4 solution given the -2000mv potential. When Zr-alloy is in corrosion environment, the wear extent increases in proportion to the increase of the potential, and the fretting wear and fretting corrosion result from mainly electrochemical action.

Installation and Performance Analysis of 125 kW Organic Rankine Cycle for Stationary Fuel Cell Power Plant

2016 ◽  
Author(s):  
Kwanghak Huh ◽  
Parsa Mirmobin ◽  
Shamim Imani
Keyword(s):  
Renewable Energy ◽  
Fuel Cell ◽  
Power Plant ◽  
Performance Analysis ◽  
Power Plants ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Molten Carbonate ◽  
And Performance

Installation and performance analysis of Thermapower™ 125MT Organic Rankine Cycle (ORC) System for recovery of waste heat from an existing Molten Carbonate Fuel Cell (MCFC) plant are presented. Over the last three years, about 100 MWe of new FC stationary power plants are in operation in Korea and more FC stationary power plants are on order and planned. The success of these fuel cell plants is their capability to supply both electricity and heat to customers. In order to promote renewable energy in Korea, the Korean Government is enforcing large power plants to supply electricity generated by renewable energy. The Korea Power Exchange (KPX) buys fuel cell generated electricity as renewable energy with higher price than other fossil fuel power plants [1]. Most of these FC plants supply electricity to power companies with their full capability, however valuable heat is wasted due to the limited demand, especially in summer season and off working hours or lack of heat pipe infrastructures. Due to the recent decrease in electricity price for renewable energy in Korea, the need for efficient utilization of waste heat is ever more demanding. In this study, 125 kWe ORC system is installed to 11.2 MWe FC power plant to demonstrate cost saving benefits. This FC Power plant has 4 units of 2.8 MWe fuel cell in operation and has capacity of producing 6.0 ton/h of 167°C steam. In order to install an ORC system to existing FC plant, their Balance of Plant (BoP) has to be modified since only excess steam is allow to be utilized by the ORC system, after supplying steam to their prime customer. Furthermore, site has distinctly hot and cold seasons, thus affecting condensing conditions and therefore ORC performance. Design considerations to accommodate varying ambient conditions as well as steam flow rate variation are presented and discussed.

scholarly journals Systemic issues of the power plants APCS development technology and performance paradigm

2020 ◽  
Vol 1683 ◽  
pp. 042057
Author(s):  
Yu S Tverskoy ◽  
A V Golubev ◽  
I K Muravev ◽  
A N Nikonorov ◽  
I A Kolesov ◽  
...  
Keyword(s):  
Power Plants ◽  
Development Technology ◽  
And Performance

Feasibility Study of a Supercritical Cycle as a Waste Heat Recovery System

2013 ◽  
Author(s):  
Antonio Agresta ◽  
Antonella Ingenito ◽  
Roberto Andriani ◽  
Fausto Gamma
Keyword(s):  
Power Systems ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Power Plants ◽  
Energy Savings ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Organic Fluids

Following the increasing interest of aero-naval industry to design and build systems that might provide fuel and energy savings, this study wants to point out the possibility to produce an increase in the power output from the prime mover propulsion systems of aircrafts. The complexity of using steam heat recovery systems, as well as the lower expected cycle efficiencies, temperature limitations, toxicity, material compatibilities, and/or costs of organic fluids in Rankine cycle power systems, precludes their consideration as a solution to power improvement for this application in turboprop engines. The power improvement system must also comply with the space constraints inherent with onboard power plants, as well as the interest to be economical with respect to the cost of the power recovery system compared to the fuel that can be saved per flight exercise. A waste heat recovery application of the CO2 supercritical cycle will culminate in the sizing of the major components.

AXITURB: A Full Computer Implementation of the NASA Design Procedure for Axial-Flow Turbines

1993 ◽  
Author(s):  
P. C. Lu ◽  
Chen-Ying Wang
Keyword(s):  
Alkali Metals ◽  
Axial Flow ◽  
Design Procedure ◽  
Rankine Cycle ◽  
Eutectic Alloys ◽  
Singular Case ◽  
Cycle Space ◽  
Power Turbine ◽  
Parametric Studies

Abstract A recent task to design a Rankine-cycle space-power turbine system employing eutectic alloys of alkali metals prompted the present authors to re-examine the NASA design procedure for axial-flow turbines, as outlined by Glassman and Futral (and based on works of Stewart) in 1963. After clarifying the role of the singular case of a single-stage turbine, and organizing the procedure in clear steps, a computer program AXITURB was written. The present paper reports essentially the success of AXITURB in performing parametric studies of NaK and CsK turbines (using 78.4% and 23.1%, respectively, of potassium by weight), after re-generating all the reported NASA designs for turbines employing pure Na, K and Cs. An outline of design steps is also given. AXITURB has been put in public domain. Its heavily commented source code in FORTRAN is available to designers for adaption or modification.

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