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pump housing
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Proceedings Papers
AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 759-767, October 11–14, 2016,
... to be subjected to further analysis. Here especially the pump housing is in the focus. boiler water circulation pump damage mechanical analysis peripheral components power plants pump housing Advances in Materials Technology for Fossil Power Plants Proceedings from the Eighth International...
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In previous investigations on life with flexible driving were highly stressed components predominantly in hot continuous pressurized part of power plants in the foreground. However cases of damage and subsequent studies on peripheral components such as the boiler circulation system (boiler circulating pump) showed that a potential failure as well as a high hazard potential respectively great consequential damage can occur when such components are operated under different conditions. To avoid damages and losses resulting from damage to peripheral components, these components have to be subjected to further analysis. Here especially the pump housing is in the focus.
Proceedings Papers
AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 747-758, October 11–14, 2016,
... of the upper casing of the circulation pump induced destruction in the boiler house and damage in the machine house. The break of the upper casing was comparable to an explosion and the time between the first significant noises and the break was short. Therefore, it was a necessity to find out the reason...
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A failure of the upper casing of the circulation pump led to a big damage in the PP Staudinger unit 5 on 12th of May 2014. According to the §18(2) BetrSichV an extensive root cause analysis (RCA) was started. From the beginning on different lines of activities were initiated to handle the situation with the required diligence. Decisions were made, taking into account safety regulations, possibility of repair and best practice engineering. Following the board decision to repair the unit 5, a lot of detailed work was done. All of the performed work packages were linked in different timelines and needed to meet in the key points. Consequently it was a challenge to achieve the agreed date of unit 5 restart on 15th of January 2015. The unit restart on the targeted date was a proof of the excellent collaboration between all involved parties. The presentation gives a summarizing overview about the damage, the main results of the RCA and the repair activities.
Proceedings Papers
AM-EPRI2010, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Sixth International Conference, 393-407, August 31–September 3, 2010,
... more fully in the following paragraphs. Inspectability. Inspection of large cast components including pump housings, valve bodies, elbows, flanges, sweepolets, steam chests, turbine casing shells, nozzles, canister plugs, etc. is challenging due to the non-homogenous microstructure within castings...
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The manufacture of large, complex components for ultra-supercritical and oxy-combustion applications will be extremely costly for industry over the next few decades as many of these components will be manufactured from expensive, high strength, nickel-based alloys casting and forgings. The current feasibility study investigates the use of an alternative manufacturing method, powder metallurgy and hot isostatic processing (PM/HIP), to produce high quality, and potentially less expensive components for power generation applications. Benefits of the process include manufacture of components to near-net shapes, precise chemistry control, a homogeneous microstructure, increased material utilization, good weldability, and improved inspectability.
Proceedings Papers
AM-EPRI2013, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference, 60-73, October 22–25, 2013,
... justify the extra thickness of the nickel alloy pressure parts? Does the efficiency increase associated with double reheat justify the additional material and equipment cost? Using in-house performance and cost estimation tools, EPRI has embarked on a study to evaluate the relative cost of single reheat...
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Increasing the steam temperature of a coal-fired pulverized coal (PC) power plant increases its efficiency, which decreases the amount of coal required per MW of electrical output and therefore decreases the emissions from the plant, including CO 2 . However, increasing the steam temperature requires that the materials for the boiler pressure parts and steam turbine be upgraded to high-nickel alloys that are more expensive than alloys typically used in existing PC units. This paper explores the economics of A-USC units operating between 595°C and 760°C (1100°F to 1400°F) with no CO 2 removal and with partial capture of CO 2 at an emission limit of 454 kg CO 2 /MW-hr (1000 lb CO 2 /MW-hr) on a gross power basis. The goal of the paper is to understand if the improved efficiency of A-USC would reduce the cost of electricity compared to conventional ultra-supercritical units, and estimate the economically “optimal” steam temperature with and without CO 2 removal.
Proceedings Papers
AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 723-734, October 11–14, 2016,
... were housed at Cranfield University (CU) in the UK and at the Ricerca Sistema Energetico (RSE) in Italy, with the rig at the National Physical Laboratory (NPL) in the UK being developed within the project. A schematic of the CU erosion rig is shown in Figure 1. Air from the high pressure compressor...
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Work has been progressing over recent years to develop a standard test method for high temperature solid particle erosion testing. Early in 2015 this standard was published by ASTM as G211-14 Standard Test Method for Conducting Elevated Temperature Erosion Tests by Solid Particle Impingement Using Gas Jets. To support the development of this standard the European funded METROSION project has been conducting a comparison of different apparatus which employ different nozzle geometries, acceleration lengths, stand-off distances and heating and accelerating processes. The aim is to understand the influence these instrumental and experimental parameters have on the measured erosion rate and erosion mechanism. As part of this work three very distinct approaches have been compared using a common erodent and test pieces. Measurements have been performed at 600 °C with particle velocities of 50 to 320 m/s, using different stand-off distances, acceleration lengths and nozzle diameters for impact angles of 30 and 90°. This is the first time a comprehensive comparison of these parameters has been conducted and shows the relative influence of these experimental variables.
Proceedings Papers
AM-EPRI2016, Advances in Materials Technology for Fossil Power Plants: Proceedings from the Eighth International Conference, 1126-1137, October 11–14, 2016,
... in-house. Two types of samples were chosen for testing, standard bone-shaped tensile specimens (see Fig. 2) and tubes. The results of bone shaped samples out of Alloy 347 Nb tested 2.5x10-6 mm/s at are shown here. A schematic drawing of the corrosion chamber with the 2 holding systems as well as the test...
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Solar salts are used as an energy storage media and heat transfer fluid in power plants. The salts can cause significant corrosion to various steels that are in contact with the salt. Static corrosion tests performed with different steels show, that the corrosive attack by industrial grade salt melts is more severe than by defined grade salt melts and the sample corrosion is faster (i.e. the weight gain is larger) for higher temperatures. Slow strain rate (SSR) tests in salt are difficult to conduct due to the corrosive attack of the salt also on the test setup. The SSRT setup in salt could be realized and tests could be conducted successfully. No clear evidence for an accelerated failure of samples tested in salt compared to samples tested in air could be found on Alloy 347 Nb. Comparative low cycle fatigue (LCF) tests at air and in molten salt atmosphere were successfully performed and showed similar results on tubes out of Sanicro 25. No evidence of accelerated crack growth in molten salt could be found.