The Experts below are selected from a list of 11262 Experts worldwide ranked by ideXlab platform
V I Breus - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the Hydraulic Regimes of Vertical Waste-Heat Boilers of Combined-Cycle Gas-Turbine Units
Power Technology and Engineering, 2019Co-Authors: I I Belyakov, V I Breus, M. S. PopovAbstract:An analysis of the hydraulic system of the natural circulation loop of the waste-heat boilers of combined-cycle gas turbine units is performed. It is demonstrated that the standard method of hydraulic calculation of steam boilers based on an evaluation of the reliability criteria of the hydraulic system and the thermal regime of the Evaporator tubes is incorrect. The existence of loop-wide hydraulic persistence of flow in the Low-Pressure Evaporator in natural circulation caused by elevated resistance of the steam-outlet tubes is demonstrated for the first time. Recommendations are given for increasing the reliability of the hydraulic system of the Low-Pressure Evaporator loop and selecting an optimal combined water and chemical regime to prevent erosion wear of the metal of the inner surface of the Evaporator tubes.
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Causes of Erosion-Induced Damage to Elements of Low-Pressure Evaporator Circuits of the Heat-Recovery Boilers of Combined-Cycle Power Plants
Power Technology and Engineering, 2019Co-Authors: I I Belyakov, V I Breus, M. S. PopovAbstract:An analysis of the causes of erosion-induced wear of the metal in pipe bends of Evaporator heating pipe surfaces is performed based on experience gained from the operation of the heat-recovery boilers of combined-cycle (steam-gas) power plants. Damage to the Evaporator tubes of a Low-Pressure boiling circuit is caused by the destruction of the protective oxide film due to intensive turbulization of the near-wall layer of water (which is at saturation temperature) travelling through the bend, inducing cavitation due to the formation of steam bubbles and their condensation. The protective oxide film formed in the hydrate water chemistry regime possesses the greatest stability.
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damage to steam generating tubes of low pressure circuit of drum type heat recovery boiler used in the pgu 450 combined cycle unit at severozapadnaya cogeneration plant
Thermal Engineering, 2009Co-Authors: V I Nikitin, I I Belyakov, V I BreusAbstract:The results of investigation into the nature of damage to tube bends of the Low-Pressure Evaporator of the P-90 heat recovery boiler installed at the Severozapadnaya cogeneration plant are presented. It has been found that damage was caused by cavitation wear due to action of steam-water flow.
D. A. Khokhlov - One of the best experts on this subject based on the ideXlab platform.
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Investigation into Factors Causing Damage to Low-Pressure Loop Evaporating Tubes of Large-Capacity Heat-Recovery Steam Generators
Thermal Engineering, 2020Co-Authors: K. A. Pleshanov, V. S. Pankov, R. S. Maslov, K. V. Sterkhov, D. A. KhokhlovAbstract:— The article addresses factors causing damage—in particular, flow accelerated corrosion wear (FAC) of tube walls—to the Evaporator operating in the Low-Pressure loop of the Ep-258/310/35-15.0/3.14/0.44-540/535/263 (P-132) heat-recovery steam generator used as part of a 795-MW combined-cycle plant. Factors influencing the FAC, namely, improper water chemistry, availability of gas shunts in the steam generator, and high mixture motion velocity in the tubes in combination with the flow path configuration, are described. The damages inflicted to the tubes and their locations in the heat-recovery steam generator Low-Pressure loop are described. It is shown that gas shunts in the heat-recovery steam generator result in an increased heat absorption and higher velocity of medium in the boundary tubes of Low-Pressure Evaporator tube banks, which intensifies the tube’s wear process. It has been found that the water chemistry used for the Kirishi District Power Plant (DPP) heat-recovery steam generator was not the factor that caused damage to the Low-Pressure loop tubes. The Kirishi DPP steam generator was compared with other similar large-capacity heat-recovery steam generators. For analyzing the Low-Pressure Evaporator performance indicators, the loop and the processes occurring in it were modeled using the Boiler Designer software. An analysis of the results from comparison of the steam generator design and performance characteristics has shown that it is necessary to change the two-phase mixture motion velocity in the Kirishi DPP steam generator Low-Pressure loop by modifying the design or operating parameters. The wear of the Low-Pressure Evaporator tube walls was mathematically modeled, the results of which confirm that erosion wear is one of the main factors causing damage to the tubes. The erosion is caused by the intense dynamic effect of two-phase, high-velocity flow jets on the tube walls. General recommendations for decreasing the wear of heat-recovery steam generator tubes are given. It has been determined that the increased wear of tubes in the Low-Pressure loop of the P-132 steam generator at the Kirishi DPP is caused by a combination of a few factors, such as high velocity of steam–water mixture, availability of bends, and unsatisfactory quality of aligning the tubes at their welding places.
V. S. Pankov - One of the best experts on this subject based on the ideXlab platform.
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Investigation into Factors Causing Damage to Low-Pressure Loop Evaporating Tubes of Large-Capacity Heat-Recovery Steam Generators
Thermal Engineering, 2020Co-Authors: K. A. Pleshanov, V. S. Pankov, R. S. Maslov, K. V. Sterkhov, D. A. KhokhlovAbstract:— The article addresses factors causing damage—in particular, flow accelerated corrosion wear (FAC) of tube walls—to the Evaporator operating in the Low-Pressure loop of the Ep-258/310/35-15.0/3.14/0.44-540/535/263 (P-132) heat-recovery steam generator used as part of a 795-MW combined-cycle plant. Factors influencing the FAC, namely, improper water chemistry, availability of gas shunts in the steam generator, and high mixture motion velocity in the tubes in combination with the flow path configuration, are described. The damages inflicted to the tubes and their locations in the heat-recovery steam generator Low-Pressure loop are described. It is shown that gas shunts in the heat-recovery steam generator result in an increased heat absorption and higher velocity of medium in the boundary tubes of Low-Pressure Evaporator tube banks, which intensifies the tube’s wear process. It has been found that the water chemistry used for the Kirishi District Power Plant (DPP) heat-recovery steam generator was not the factor that caused damage to the Low-Pressure loop tubes. The Kirishi DPP steam generator was compared with other similar large-capacity heat-recovery steam generators. For analyzing the Low-Pressure Evaporator performance indicators, the loop and the processes occurring in it were modeled using the Boiler Designer software. An analysis of the results from comparison of the steam generator design and performance characteristics has shown that it is necessary to change the two-phase mixture motion velocity in the Kirishi DPP steam generator Low-Pressure loop by modifying the design or operating parameters. The wear of the Low-Pressure Evaporator tube walls was mathematically modeled, the results of which confirm that erosion wear is one of the main factors causing damage to the tubes. The erosion is caused by the intense dynamic effect of two-phase, high-velocity flow jets on the tube walls. General recommendations for decreasing the wear of heat-recovery steam generator tubes are given. It has been determined that the increased wear of tubes in the Low-Pressure loop of the P-132 steam generator at the Kirishi DPP is caused by a combination of a few factors, such as high velocity of steam–water mixture, availability of bends, and unsatisfactory quality of aligning the tubes at their welding places.
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Methods to Combat the Causes of Damage to the Steam-Forming Pipes of the Low-Pressure Circuit in CCPP Heat Recovery Steam Generators
Power Technology and Engineering, 2019Co-Authors: V. S. Pankov, E. A. SmirnovAbstract:The reliability and effectiveness of the operation of combined-cycle power plants (CCPP) depend largely on the erosion-corrosion resistance of the power system equipment, including heat recovery steam generators (HRSG). Foreign and domestic experience shows that one of the most widespread failure modes is wear of the Low-Pressure Evaporator tube system (LPETS), resulting in premature reduction of metal thickness and sudden fracture of Low-Pressure Evaporator (LPE) components of CCPP heat recovery steam generators. A lists of the primary factors that affect the occurrence and development of flow-accelerated corrosion is provided. Data is presented on the dependence of the erosion-corrosion rate of various metals in water on the temperature and a velocity of the working medium. Problems that arise in the LPEs of the heat recovery steam generators Kirishi State District Power Plant and paths for resolution are examined.
I I Belyakov - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the Hydraulic Regimes of Vertical Waste-Heat Boilers of Combined-Cycle Gas-Turbine Units
Power Technology and Engineering, 2019Co-Authors: I I Belyakov, V I Breus, M. S. PopovAbstract:An analysis of the hydraulic system of the natural circulation loop of the waste-heat boilers of combined-cycle gas turbine units is performed. It is demonstrated that the standard method of hydraulic calculation of steam boilers based on an evaluation of the reliability criteria of the hydraulic system and the thermal regime of the Evaporator tubes is incorrect. The existence of loop-wide hydraulic persistence of flow in the Low-Pressure Evaporator in natural circulation caused by elevated resistance of the steam-outlet tubes is demonstrated for the first time. Recommendations are given for increasing the reliability of the hydraulic system of the Low-Pressure Evaporator loop and selecting an optimal combined water and chemical regime to prevent erosion wear of the metal of the inner surface of the Evaporator tubes.
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Causes of Erosion-Induced Damage to Elements of Low-Pressure Evaporator Circuits of the Heat-Recovery Boilers of Combined-Cycle Power Plants
Power Technology and Engineering, 2019Co-Authors: I I Belyakov, V I Breus, M. S. PopovAbstract:An analysis of the causes of erosion-induced wear of the metal in pipe bends of Evaporator heating pipe surfaces is performed based on experience gained from the operation of the heat-recovery boilers of combined-cycle (steam-gas) power plants. Damage to the Evaporator tubes of a Low-Pressure boiling circuit is caused by the destruction of the protective oxide film due to intensive turbulization of the near-wall layer of water (which is at saturation temperature) travelling through the bend, inducing cavitation due to the formation of steam bubbles and their condensation. The protective oxide film formed in the hydrate water chemistry regime possesses the greatest stability.
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damage to steam generating tubes of low pressure circuit of drum type heat recovery boiler used in the pgu 450 combined cycle unit at severozapadnaya cogeneration plant
Thermal Engineering, 2009Co-Authors: V I Nikitin, I I Belyakov, V I BreusAbstract:The results of investigation into the nature of damage to tube bends of the Low-Pressure Evaporator of the P-90 heat recovery boiler installed at the Severozapadnaya cogeneration plant are presented. It has been found that damage was caused by cavitation wear due to action of steam-water flow.
Hanieh Molaie - One of the best experts on this subject based on the ideXlab platform.
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sensitivity analysis of exergy destruction in a real combined cycle power plant based on advanced exergy method
Energy Conversion and Management, 2015Co-Authors: Fateme Ahmadi Boyaghchi, Hanieh MolaieAbstract:Abstract The advanced exergy analysis extends engineering knowledge beyond the respective conventional methods by improving the design and operation of energy conversion systems. In advanced exergy analysis, the exergy destruction is splitting into endogenous/exogenous and avoidable/unavoidable parts. In this study, an advanced exergy analysis of a real combined cycle power plant (CCPP) with supplementary firing is done. The endogenous/exogenous irreversibilities of each component as well as their combination with avoidable/unavoidable irreversibilities are determined. A parametric study is presented discussing the sensitivity of various performance indicators to the turbine inlet temperature (TIT), and compressor pressure ratio ( r c ). It is observed that the thermal and exergy efficiencies increase when TIT and r c rise. Results show that combustion chamber (CC) concentrates most of the exergy destruction (more than 62%), dominantly in unavoidable endogenous form which is decreased by 11.89% and 13.12% while the avoidable endogenous exergy destruction increase and is multiplied by the factors of 1.3 and 8.6 with increasing TIT and r c , respectively. In addition, TIT growth strongly increases the endogenous avoidable exergy destruction in high pressure superheater (HP.SUP), CC and low pressure Evaporator (LP.EVAP). It, also, increases the exogenous avoidable exergy destruction of HP.SUP and low pressure steam turbine (LP.ST) and leads to the high decrement in the endogenous exergy destruction of the preheater (PRE) by about 98.8%. Furthermore, r c growth extremely rises the endogenous avoidable exergy destruction of gas turbine (GT), CC and high pressure Evaporator (HP.EVAP); it also increases the exogenous exergy destruction in LP.EVAP, GT, air compressor (AC) and PRE and causes the most increment in endogenous exergy destruction of GT by about 28.4%. Therefore, an increase in TIT and r c has positive effect on most of the component’s potential improvements to have a CCPP with higher efficiency and lower exergy destruction.
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Investigating the effect of duct burner fuel mass flow rate on exergy destruction of a real combined cycle power plant components based on advanced exergy analysis
Energy Conversion and Management, 2015Co-Authors: Fateme Ahmadi Boyaghchi, Hanieh MolaieAbstract:Abstract In this research, an advanced exergy analysis of a real combined cycle power plant (CCPP) with supplementary firing is investigated. The endogenous/exogenous irreversibilities of each component and their combination with avoidable/unavoidable irreversibilities are identified. Furthermore, parametric study of the total exergy destruction, thermal and exergetic efficiencies and different parts of exergy destruction of each component are examined as a function of duct burner fuel mass flow rate ( m DB ). It is revealed that the avoidable exergy destruction of CCPP decreases within 23.9% while its unavoidable part increases by about 50% as m DB increases. In addition, the endogenous avoidable exergy destruction of CCPP gets 3 times while its exogenous part of avoidable is reduced within 86% by increasing m DB . It is found that the growth of m DB elevates the potential improvement of high pressure superheater (HP.SUP), low pressure Evaporator (LP.EVAP) and low pressure steam turbine (LP.ST), and decreases the avoidable exergy destruction of the high pressure Evaporator (HP.EVAP) and duct burner (DB). Moreover, the increment of m DB , decreases the unavoidable exergy destruction just in high pressure steam turbine (HP.ST) and dearator (DEAR) by about 8.2% and 5%, respectively, and increases the exogenous of avoidable exergy destruction of DB ( E D , DB AV ) within 166%. It means that the effect of other components irreversibilities on avoidable exergy destruction of DB is increased while inefficiency of this component has considerable decrement on its avoidable exergy destruction.
