Determination of additional factors in assessing the reliability of heat supply systems

The paper considers the calculation of heat losses through a non-insulated pipeline section of a waste-heat recovery system in a thermal power plant. The waste-heat recovery system of a power generator includes two circuits from each unit and the network water pipelines. The first circuit of the waste-heat recovery system is the high-temperature cooling loop of the generator gas reciprocating engine. The first circuit extracts heat from the engine cooling jacket. The second circuit of the waste-heat recovery system consists of the engine exhausts heat recovery boiler, heat exchanger (heated side), network plate-type heat exchangers, and a pipeline system. In the second circuit, the heat of the first circuit and the heat of the exhausts in the heat recovery boiler is extracted. The recovery boiler pipeline with no thermal insulation is routed on the roof of the thermal power plant. The research objective was to determine the actual heat losses through the non-insulated pipeline section and to compare the obtained data with the regulatory one.

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“…The actual heat losses through non-insulated pipelines are defined by formulae [18][19][20][21][22][23]:…”

Section: Methodsmentioning

confidence: 99%

Calculation of Heat Losses Through Non-Insulated Pipelines of a Waste-Heat Recovery System in a Thermal Power Plant

Mozgova

Terekhova

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Planar trusses are common structural elements in many industrial and civil buildings [1][2][3][4][5]. The issues of reliability are of high priority in various industries [6][7][8][9][10] and it is highly relevant for construction industry, so development and modernization of approaches to trusses safety assessment is an actual scientific problem because there are some cases of trusses failure caused by errors of structural engineers in recent years [11,12].…”

Section: Introductionmentioning

confidence: 99%

Structural reliability analysis of a planar truss in case of limited statistical data

Solovyev

Solovyeva

2021

E3S Web Conf.

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Trusses are common structural elements in many industrial and civil buildings. The article describes the approach to planar trusses reliability analysis in case of limited statistical data. The proposed approach can be used when it is complicated to determine a cumulative distribution function for design loads and physical/mechanical properties of the material of structural elements. The proposed method for structural reliability analysis requires only estimates of mathematical expectations and standard deviations. The article also presents the equation for planar truss reliability assessment as a system of structural elements. The result of a planar truss reliability analysis is obtained at an interval of non-failure probabilities. If the resulting reliability interval is too wide for decision-making, it is necessary to improve the quality of statistical data for a more accurate assessment of reliability (non-failure probability).

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“…The issues of ensuring reliability, stable operation and high efficiency of various objects of power engineering facilities are of high priority today [1][2][3][4][5]. For example, the usual task of power supply systems with quiescent load is to reduce the short-circuit currents.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the operating modes of the resonant current-limiting device

et al. 2020

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Decreasing of short-circuit currents in power supply systems enables the usage of less expensive switching-protective devices with a lower breaking capacity and reduction of damage from the consequences of emergency events. In electrical networks of low, medium and high voltage classes, resonant current-limiting devices are used to solve this problem, along with other technical solutions. However, these devices have unsatisfactory weight and dimensions, high cost and other disadvantages. The technical and economic indicators of such devices can be improved through the use of a coil-capacitor (coilcap). Coilcap is a passive element of an electric circuit, which simultaneously possesses inductivecapacitive properties and performs the functions of a reactor and a capacitor in a single technical object. This paper presents a functional diagram of the implementation, design, operating principle and mathematical description of a resonant current-limiting device based on a coilcap. Physical modeling of the steady-state modes of the device (normal mode and current limiting mode) was carried out, and the possibility of limiting short-circuit currents due to the use of a coilcap was confirmed. The practical application of a resonant current-limiting device based on a coilcap can be effectively combined with switching-protective and current-limiting disconnecting devices, relay protection, and automation equipment.

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Determination of additional factors in assessing the reliability of heat supply systems

Cited by 6 publications

References 7 publications

Calculation of Heat Losses Through Non-Insulated Pipelines of a Waste-Heat Recovery System in a Thermal Power Plant

Calculation of Heat Losses Through Non-Insulated Pipelines of a Waste-Heat Recovery System in a Thermal Power Plant

Structural reliability analysis of a planar truss in case of limited statistical data

Experimental study of the operating modes of the resonant current-limiting device

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