J1010503 Vibration Reduction Effects for Thermal Power Boiler Structures with High Energy Absorbing Seismic Ties

2014 ◽  
Vol 2014 (0) ◽  
pp. _J1010503--_J1010503-
Author(s):  
Kiyoshi AIDA ◽  
Masahiro IFUKU ◽  
Kodai KAWATE ◽  
Koutaro KAWAMURA ◽  
Satoshi FUJITA
Keyword(s):  
Thermal Power ◽  
Vibration Reduction ◽  
High Energy ◽  
Energy Absorbing ◽  
Power Boiler

Development of High Energy Absorbing Seismic Tie With I-Sectional Shape for Thermal Power Boiler Structure

2013 ◽  
Author(s):  
Kiyoshi Aida ◽  
Kotaro Kawamura
Keyword(s):  
Thermal Power ◽  
Reaction Force ◽  
High Energy ◽  
Scale Model ◽  
Design Parameters ◽  
Load Testing ◽  
Support Structure ◽  
Flange Thickness ◽  
Round Section ◽  
Energy Absorbing

This paper deals with new types of steel seismic ties, which are energy absorbing devices installed between boiler and its support structure. To enhance the aseismic reliability of the boiler and its support structure, energy absorbing capacities of the seismic ties must be increased. To increase the capacities, sectional shapes of the seismic ties have been optimally designed. Concretely, I-section seismic ties as new types have been gained by optimizing the design parameters, material (conventional carbon steel and low yield strength steel), sectional height, web thickness, flange thickness under conditions to maximize absorbing energy and to restrict the reaction force equal to or smaller than that of round-section current seismic tie. As a result of cyclic load testing using 1/3 scale model, it was verified that energy absorption of the new types of seismic ties were 16–23 % larger than that of the current seismic tie.

Elasto-Plastic Finite Element Analysis of Long-Lived Seismic Ties for Thermal Power Boiler Structure

2017 ◽  
Author(s):  
Kiyoshi Aida ◽  
Shoji Morikawa ◽  
Masaki Shimono ◽  
Motoki Kato ◽  
Kunihiro Morishita ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Power ◽  
Support Structure ◽  
Element Analysis ◽  
Earthquake Loads ◽  
Energy Absorbing ◽  
Power Boiler

This paper deals with the modification of recently developed steel seismic ties, which are energy absorbing devices installed between a boiler and its support structure. To enhance the aseismic reliability of the boiler and its support structure for recently increased specified earthquake loads, the useful live of the seismic ties must be prolonged. To achieve this, changes to the sectional shapes of the seismic ties have been analyzed and designed with the help of elasto-plastic finite element analysis.

scholarly journals Application of High Energy Absorbing Materials for Blast Protection

2018 ◽  
Vol 1 (2) ◽  
pp. 93-96 ◽  
Author(s):  
Tünde Kovács ◽  
Zoltán Nyikes ◽  
Lucia Figuli
Keyword(s):  
Impact Load ◽  
Material Selection ◽  
High Energy ◽  
Terrorist Attacks ◽  
Selection Rules ◽  
Blast Protection ◽  
Absorbing Materials ◽  
Current Century ◽  
The Face ◽  
Energy Absorbing

Abstract In the current century, building protection is very important in the face of terrorist attacks. The old buildings in Europe are not sufficiently resilient to the loads produced by blasts. We still do not fully understand the effects of different explosives on buildings and human bodies. [1–3] Computing blast loads are different from that of traditional loads and the material selection rules for this type of impact load are diverse. Historical and old buildings cannot be protected simply by new walls and fences. New ways need to be found to improve a building’s resistance to the effects of a blast. It requires sufficiently thin yet strong retrofitted materials in order to reinforce a building’s walls [4–6].

Composite Core Cross Tube Crushing Analysis

2020 ◽  
Author(s):  
Sean Jenson ◽  
Muhammad Ali ◽  
Khairul Alam
Keyword(s):  
Energy Absorption ◽  
Compressive Loading ◽  
Deformation Mode ◽  
High Energy ◽  
Absorption Capacity ◽  
Functionally Graded ◽  
Layer By Layer ◽  
Thin Walled ◽  
The Cross ◽  
Energy Absorbing

Abstract Thin walled axial members are typically used in automobiles’ side and front chassis to improve crashworthiness of vehicles. Extensive work has been done in exploring energy absorbing characteristics of thin walled structural members under axial compressive loading. The present study is a continuation of the work presented earlier on evaluating the effects of inclusion of functionally graded cellular structures in thin walled members under axial compressive loading. A compact functionally graded composite cellular core was introduced inside a cross tube with side length and wall thickness of 25.4 mm and 3.048 mm, respectively. The parameters governing the energy absorbing characteristics such as deformation or collapsing modes, crushing/ reactive force, plateau stress level, and energy curves, were evaluated. The results showed that the inclusion of composite graded cellular structure increased the energy absorption capacity of the cross tube significantly. The composite graded structure underwent progressive stepwise, layer by layer, crushing mode and provided lateral stability to the cross tube thus delaying local tube wall collapse and promoting large localized folds on the tube’s periphery as compared to highly localized and compact deformation modes that were observed in the empty cross tube under axial compressive loading. The variation in deformation mode resulted in enhanced stiffness of the composite structure, and therefore, high energy absorption by the structure. This aspect has a potential to be exploited to improve the crashworthiness of automobile structures.

scholarly journals Comparison of Heat Transfer Enhancement Techniques in Latent Heat Storage

2020 ◽  
Vol 10 (16) ◽  
pp. 5519 ◽  
Author(s):  
William Delgado-Diaz ◽  
Anastasia Stamatiou ◽  
Simon Maranda ◽  
Remo Waser ◽  
Jörg Worlitschek
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Latent Heat ◽  
Heat Transfer Performance ◽  
Thermal Power ◽  
High Energy ◽  
High Energy Density ◽  
Evaluation Procedure ◽  
Transfer Performance ◽  
Experimental Conditions

Latent Heat Energy Storage (LHES) using Phase Change Materials (PCM) is considered a promising Thermal Energy Storage (TES) approach as it can allow for high levels of compactness, and execution of the charging and discharging processes at defined, constant temperature levels. These inherent characteristics make LHES particularly attractive for applications that profit from high energy density or precise temperature control. Many novel, promising heat exchanger designs and concepts have emerged as a way to circumvent heat transfer limitations of LHES. However, the extensive range of experimental conditions used to characterize these technologies in literature make it difficult to directly compare them as solutions for high thermal power applications. A methodology is presented that aims to enable the comparison of LHES designs with respect to their compactness and heat transfer performance even when largely disparate experimental data are available in literature. Thus, a pair of key performance indicators (KPI), ΦPCM representing the compactness degree and NHTPC, the normalized heat transfer performance coefficient, are defined, which are minimally influenced by the utilized experimental conditions. The evaluation procedure is presented and applied on various LHES designs. The most promising designs are identified and discussed. The proposed evaluation method is expected to open new paths in the community of LHES research by allowing the leveled-ground contrast of technologies among different studies, and facilitating the evaluation and selection of the most suitable design for a specific application.

Design of Fiber-Reinforced Composite Tubes as Energy Absorption Element

2009 ◽  
Author(s):  
Y. Yang ◽  
S. Terada ◽  
M. Okano ◽  
A. Nakai ◽  
H. Hamada
Keyword(s):  
Energy Absorption ◽  
High Energy ◽  
Fiber Reinforced ◽  
Inertia Moment ◽  
Reinforced Composite ◽  
Bending Behavior ◽  
High Energy Absorption ◽  
Energy Absorbing ◽  
Frp Tubes ◽  
Two Sides

As an energy absorption member, fiber-reinforced composites (FRPs) are more favorable because they are light in weight and possess better energy absorption capabilities as compared to their metal counterparts. However, the energy absorbing mechanisms of FRP are complicated owning to the multi-micro fractures. Therefore, in this study, the designs of FRP tubes were carried out with considerations directed at the energy absorbing mechanisms. Two methods based on the design of the energy absorbed by bending of the fronds (Ubend) and the energy absorbed by fiber fractures (Uff) are concentrated. Here the bending behavior of frond can be considered as the bending beam by an external force. And it is found that Ubend is affected directly by the inertia moment I, which is affect by the geometry. Therefore, FRP tubes were fabricated to have a geometry combined with a bigger I. Additional, in order to get more fiber fractures to get an increased Uff, the design of bending stress, σ, was carried out. FRP tubes bending towards one side only rather than two sides are proposed to get bending fronds with a double thicker thickness, which in turn led to high stresses, many fiber fractures and high energy absorption.

2C2 Creep Property Evaluation of Highly Aged Thermal Power Boiler Tubes by Small Punch Test

2013 ◽  
Vol 2013 (0) ◽  
pp. 77-78
Author(s):  
Jumpei ARIDOME ◽  
Kazuto FUJITA ◽  
Shin-ichi KOMAZAKI ◽  
Terutaka FUJIOKA ◽  
Ken-ichi KOBAYASHI
Keyword(s):  
Thermal Power ◽  
Creep Property ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Property Evaluation ◽  
Boiler Tubes ◽  
Power Boiler

scholarly journals Economic feasibility of wind and photovoltaic energy in Kuwait

2021 ◽  
Vol 280 ◽  
pp. 05016
Author(s):  
Waleed K. Al-Nassar ◽  
S. Neelamani ◽  
Teena Sara William
Keyword(s):  
Wind Energy ◽  
Wind Power ◽  
Power Plants ◽  
Capital Expenditure ◽  
Thermal Power ◽  
High Energy ◽  
Economic Feasibility ◽  
Offshore Wind ◽  
Solar Pv ◽  
Levelized Cost Of Electricity

The worldwide environmental concern and awareness created a way towards the generation of pollution-free wind and solar renewable energies. Wind and Photovoltaic (PV) power plants of each 10 MW capacity located in the Shagaya area, west of Kuwait, were compared after one year of operation. The wind power plants recorded high capacity factors resulting in a yearly power production of 42.59 GWh, 21% higher than expected (contractual 31.160 GWh). It will reduce the emission of CO2 throughout the projected lifetime of 25 years by 118,303 tons. CAPEX (capital Expenditure) and OPEX (operation expenditure) were taken into consideration throughout the life of the plants along with investment costs resulting in a levelized cost of electricity (LCOE) for wind of 0.015 KWD/kWh or 0.046 USD/kWh, compared to 0.027 KWD/kWh or 0.082 USD/kWh for solar PV (44% lower than PV). Offshore, Boubyan Island, Northern Kuwait territorial waters, were found to be the foremost appropriate for wind energy generation, with Wind Power Density of more than 500 Watt/m2 in summer which is ideal for the high energy demanding season in Kuwait. The LCOE for offshore wind energy was 27.6 fils/kWh, compared to 39.3 fils/kWh for thermal power plants.

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