The Experts below are selected from a list of 192 Experts worldwide ranked by ideXlab platform

E. N. Migun - One of the best experts on this subject based on the ideXlab platform.

  • All-regime combined-cycle plant: Engineering solutions
    Thermal Engineering, 2016
    Co-Authors: P. A. Berezinets, G. G. Tumanovskii, I. N. Krylova, V. N. Markina, G. E. Tereshina, E. N. Migun
    Abstract:

    The development of distributed power generation systems as a supplement to the centralized unified power grid increases the operational stability and efficiency of the entire power generation industry and improves the power supply to consumers. An all-regime cogeneration combined-cycle plant with a power of 20–25 mW (PGU-20/25T) and an electrical efficiency above 50% has been developed at the All-Russia Thermal Engineering Institute (ATEI) as a distributed power generation object. The PGU-20/25T two-circuit cogeneration plant provides a wide electrical and thermal power adjustment range and the absence of the mutual effect of electrical and thermal power output regimes at controlled frequency and power in a unified or isolated grid. The PGU-20/25T combined-cycle plant incorporates a gas-turbine unit (GTU) with a power of 16 MW, a heat recovery boiler (HRB) with two burners (before the boiler and the last heating stage), and a cogeneration steam turbine with a power of 6/9 MW. The PGU-20/25T plant has a maximum electrical power of 22 MW and an efficiency of 50.8% in the heat recovery regime and a maximum thermal power output of 16.3 MW (14 Gcal/h) in the cogeneration regime. The use of burners can increase the electrical power to 25 MW in the steam condensation regime at an efficiency of 49% and the maximum thermal power output to 29.5 MW (25.4 Gcal/h). When the steam turbine is shut down, the thermal power output can grow to 32.6 MW (28 Gcal/h). The innovative equipment, which was specially developed for PGU-20/25T, improves the reliability of this plant and simplifies its operation. Among this equipment are microflame burners in the heat recovery boiler, a vacuum system based on liquid-ring pumps, and a vacuum deaerator. To enable the application of PGU-20/25T in Water-stressed regions, an air condenser preventing the heat-transfer tubes from the risk of covering with ice during operation in frost air has been developed. The vacuum system eliminates the need for an extraneous source of steam for the startup of the PGU-20/25T plant. The vacuum deaerator provides prestartup deaeration and the filling of the entire condensate feed pipeline with Deaerated Water and also enables the maintenance of the Water temperature before the boiler at a level of no lower than 60°C and the oxygen content at a level of no higher than 10 μg/L during operation under load. The microflame burners in the heat recovery boiler enable the independent adjustment of the electrical power and the thermal power output from the PGU-20/25T plant. All the innovative equipment has been tested on experimental prototypes.

  • All-regime combined-cycle plant: Engineering solutions
    Thermal Engineering, 2016
    Co-Authors: P. A. Berezinets, G. G. Tumanovskii, I. N. Krylova, V. N. Markina, G. E. Tereshina, E. N. Migun
    Abstract:

    The development of distributed power generation systems as a supplement to the centralized unified power grid increases the operational stability and efficiency of the entire power generation industry and improves the power supply to consumers. An all-regime cogeneration combined-cycle plant with a power of 20–25 mW (PGU-20/25T) and an electrical efficiency above 50% has been developed at the All-Russia Thermal Engineering Institute (ATEI) as a distributed power generation object. The PGU-20/25T two-circuit cogeneration plant provides a wide electrical and thermal power adjustment range and the absence of the mutual effect of electrical and thermal power output regimes at controlled frequency and power in a unified or isolated grid. The PGU-20/25T combined-cycle plant incorporates a gas-turbine unit (GTU) with a power of 16 MW, a heat recovery boiler (HRB) with two burners (before the boiler and the last heating stage), and a cogeneration steam turbine with a power of 6/9 MW. The PGU-20/25T plant has a maximum electrical power of 22 MW and an efficiency of 50.8% in the heat recovery regime and a maximum thermal power output of 16.3 MW (14 Gcal/h) in the cogeneration regime. The use of burners can increase the electrical power to 25 MW in the steam condensation regime at an efficiency of 49% and the maximum thermal power output to 29.5 MW (25.4 Gcal/h). When the steam turbine is shut down, the thermal power output can grow to 32.6 MW (28 Gcal/h). The innovative equipment, which was specially developed for PGU-20/25T, improves the reliability of this plant and simplifies its operation. Among this equipment are microflame burners in the heat recovery boiler, a vacuum system based on liquid-ring pumps, and a vacuum deaerator. To enable the application of PGU-20/25T in Water-stressed regions, an air condenser preventing the heat-transfer tubes from the risk of covering with ice during operation in frost air has been developed. The vacuum system eliminates the need for an extraneous source of steam for the startup of the PGU-20/25T plant. The vacuum deaerator provides prestartup deaeration and the filling of the entire condensate feed pipeline with Deaerated Water and also enables the maintenance of the Water temperature before the boiler at a level of no lower than 60°C and the oxygen content at a level of no higher than 10 μg/L during operation under load. The microflame burners in the heat recovery boiler enable the independent adjustment of the electrical power and the thermal power output from the PGU-20/25T plant. All the innovative equipment has been tested on experimental prototypes.

Xiao Feng - One of the best experts on this subject based on the ideXlab platform.

  • Deciphering Refinery Water System Design and Optimization: Superstructure and Generalized Mathematical Model
    ACS Sustainable Chemistry & Engineering, 2018
    Co-Authors: Chun Deng, Wei Jiang, Xiao Feng
    Abstract:

    The up-to-date approaches to optimizing Water systems only include fresh Water, regenerated Water and wasteWater and ignore other types of Water in refinery, i.e., desalted Water, Deaerated Water, circulated cooling Water, steam with different pressure levels and condensate Water. Therefore, the existing mathematical model for Water system optimizaiton is not directly applicable for the optimization of practical refinery Water systems. To overcome the limitation and bridge the theory and application, we first presented a generalized model of Water-using processes including multiple types of Water and a general superstructure for the optimization of refinery Water system. The superstructure consists of Water-using processes including multiple types of Water in the main production units (i.e., crude oil distillation, fluid catalytic cracking), Water pretreatment systems (i.e., fresh Water station, desalted Water station, steam power station) and wasteWater treatment system. The flow rate balance equations f...

  • Deciphering Refinery Water System Design and Optimization: Superstructure and Generalized Mathematical Model
    2017
    Co-Authors: Chun Deng, Wei Jiang, Xiao Feng
    Abstract:

    The up-to-date approaches to optimizing Water systems only include fresh Water, regenerated Water and wasteWater and ignore other types of Water in refinery, i.e., desalted Water, Deaerated Water, circulated cooling Water, steam with different pressure levels and condensate Water. Therefore, the existing mathematical model for Water system optimizaiton is not directly applicable for the optimization of practical refinery Water systems. To overcome the limitation and bridge the theory and application, we first presented a generalized model of Water-using processes including multiple types of Water and a general superstructure for the optimization of refinery Water system. The superstructure consists of Water-using processes including multiple types of Water in the main production units (i.e., crude oil distillation, fluid catalytic cracking), Water pretreatment systems (i.e., fresh Water station, desalted Water station, steam power station) and wasteWater treatment system. The flow rate balance equations for those components of a refinery Water system and the correlation for all types of Water are formulated. The replacement ratio of altered type of Water is introduced in the flow rate balance equations for Water reuse/recycling and it avoids the imprecise data extraction of limiting Water quality for the inlets of Water-using processes. We presented two mathematical models with different objective functions (minimum flow rate of Water resource (Scenario 1) and minimum partial annualized cost (Scenario 2)). The proposed models are applied for the optimization of the Water system of a large-scale refinery in China. Results show that the Water system with a minimum flow rate of Water source can be obtained in Scenario 1. In Scenario 2, the profit of Water conversation for five strategies cannot offset the investment cost of added pipelines, and their actual replacement ratios are zero. It leads to an economic and simpler Water system with slightly higher flow rate of Water resources

G.v. Leduhovsky - One of the best experts on this subject based on the ideXlab platform.

  • Modeling the Water decarbonization processes in atmospheric deaerators
    Thermal Engineering, 2017
    Co-Authors: G.v. Leduhovsky
    Abstract:

    A mathematical model of the Water decarbonization processes in atmospheric deaerators is proposed to calculate the thermal decomposition degree of hydrocarbonates in a deaerator, pH of a Deaerated Water sample, and the mass concentration of free carbonic acid in it on a carbon dioxide basis. The mathematical description of these processes is based on the deaeration tank Water flow model implemented in the specialized software suite for the calculation of three-dimensional liquid flows, where a real Water flow is a set of parallel small plug-flow reactors, and the rate constant of the reaction representing a generalized model of the thermal decomposition of hydrocarbonates with consideration for its chemical and diffusion stages is identified by experimental data. Based on the results of experimental studies performed on deaerators of different designs with and without steam bubbling in their tanks, an empirical support of this model has been developed in the form of recommended reaction order and rate constant values selected depending on the overall alkalinity of Water fed into a deaerator. A self-contained mathematical description of the Water decarbonization processes in deaerators has been obtained. The proposed model precision has been proven to agree with the specified metrological characteristics of the potentiometric and alkalimetric methods for measuring pH and the free carbonic acid concentration in Water. This allows us to recommend the obtained model for the solution of practical problems of forming a specified amount of Deaerated Water via the selection of the structural and regime parameters of deaerators during their design and regime adjustment.

  • Predicting the indicators characterizing the Water decarbonization efficiency when using atmospheric-pressure thermal deaerators without subjecting Water to steam bubbling in the deaerator tank
    Thermal Engineering, 2015
    Co-Authors: G.v. Leduhovsky, V N Vinogradov, S.d. Gorshenin, E. V. Barochkin, A. A. Korotkov
    Abstract:

    The results obtained from combined numerical and experimental investigations of the Water decarbonization process carried out in atmospheric-pressure deaerators without subjecting Water to steam bubbling in the deaerator tank are presented. More exact values of the hydrocarbonate thermal decomposition rate have been obtained, and the hypothesis about a change of the process governing mechanism in shifting to low total alkalinity values of Deaerated Water has been proven in the course of these investigations. A procedure for predicting the indicators characterizing the Water decarbonization efficiency in using deaerators is proposed based on the obtained study results. The developed procedure features the maximally possible accuracy that can be achieved at the metrological characteristics of the standard alkalinity measurement methods.

P. A. Berezinets - One of the best experts on this subject based on the ideXlab platform.

  • All-regime combined-cycle plant: Engineering solutions
    Thermal Engineering, 2016
    Co-Authors: P. A. Berezinets, G. G. Tumanovskii, I. N. Krylova, V. N. Markina, G. E. Tereshina, E. N. Migun
    Abstract:

    The development of distributed power generation systems as a supplement to the centralized unified power grid increases the operational stability and efficiency of the entire power generation industry and improves the power supply to consumers. An all-regime cogeneration combined-cycle plant with a power of 20–25 mW (PGU-20/25T) and an electrical efficiency above 50% has been developed at the All-Russia Thermal Engineering Institute (ATEI) as a distributed power generation object. The PGU-20/25T two-circuit cogeneration plant provides a wide electrical and thermal power adjustment range and the absence of the mutual effect of electrical and thermal power output regimes at controlled frequency and power in a unified or isolated grid. The PGU-20/25T combined-cycle plant incorporates a gas-turbine unit (GTU) with a power of 16 MW, a heat recovery boiler (HRB) with two burners (before the boiler and the last heating stage), and a cogeneration steam turbine with a power of 6/9 MW. The PGU-20/25T plant has a maximum electrical power of 22 MW and an efficiency of 50.8% in the heat recovery regime and a maximum thermal power output of 16.3 MW (14 Gcal/h) in the cogeneration regime. The use of burners can increase the electrical power to 25 MW in the steam condensation regime at an efficiency of 49% and the maximum thermal power output to 29.5 MW (25.4 Gcal/h). When the steam turbine is shut down, the thermal power output can grow to 32.6 MW (28 Gcal/h). The innovative equipment, which was specially developed for PGU-20/25T, improves the reliability of this plant and simplifies its operation. Among this equipment are microflame burners in the heat recovery boiler, a vacuum system based on liquid-ring pumps, and a vacuum deaerator. To enable the application of PGU-20/25T in Water-stressed regions, an air condenser preventing the heat-transfer tubes from the risk of covering with ice during operation in frost air has been developed. The vacuum system eliminates the need for an extraneous source of steam for the startup of the PGU-20/25T plant. The vacuum deaerator provides prestartup deaeration and the filling of the entire condensate feed pipeline with Deaerated Water and also enables the maintenance of the Water temperature before the boiler at a level of no lower than 60°C and the oxygen content at a level of no higher than 10 μg/L during operation under load. The microflame burners in the heat recovery boiler enable the independent adjustment of the electrical power and the thermal power output from the PGU-20/25T plant. All the innovative equipment has been tested on experimental prototypes.

  • All-regime combined-cycle plant: Engineering solutions
    Thermal Engineering, 2016
    Co-Authors: P. A. Berezinets, G. G. Tumanovskii, I. N. Krylova, V. N. Markina, G. E. Tereshina, E. N. Migun
    Abstract:

    The development of distributed power generation systems as a supplement to the centralized unified power grid increases the operational stability and efficiency of the entire power generation industry and improves the power supply to consumers. An all-regime cogeneration combined-cycle plant with a power of 20–25 mW (PGU-20/25T) and an electrical efficiency above 50% has been developed at the All-Russia Thermal Engineering Institute (ATEI) as a distributed power generation object. The PGU-20/25T two-circuit cogeneration plant provides a wide electrical and thermal power adjustment range and the absence of the mutual effect of electrical and thermal power output regimes at controlled frequency and power in a unified or isolated grid. The PGU-20/25T combined-cycle plant incorporates a gas-turbine unit (GTU) with a power of 16 MW, a heat recovery boiler (HRB) with two burners (before the boiler and the last heating stage), and a cogeneration steam turbine with a power of 6/9 MW. The PGU-20/25T plant has a maximum electrical power of 22 MW and an efficiency of 50.8% in the heat recovery regime and a maximum thermal power output of 16.3 MW (14 Gcal/h) in the cogeneration regime. The use of burners can increase the electrical power to 25 MW in the steam condensation regime at an efficiency of 49% and the maximum thermal power output to 29.5 MW (25.4 Gcal/h). When the steam turbine is shut down, the thermal power output can grow to 32.6 MW (28 Gcal/h). The innovative equipment, which was specially developed for PGU-20/25T, improves the reliability of this plant and simplifies its operation. Among this equipment are microflame burners in the heat recovery boiler, a vacuum system based on liquid-ring pumps, and a vacuum deaerator. To enable the application of PGU-20/25T in Water-stressed regions, an air condenser preventing the heat-transfer tubes from the risk of covering with ice during operation in frost air has been developed. The vacuum system eliminates the need for an extraneous source of steam for the startup of the PGU-20/25T plant. The vacuum deaerator provides prestartup deaeration and the filling of the entire condensate feed pipeline with Deaerated Water and also enables the maintenance of the Water temperature before the boiler at a level of no lower than 60°C and the oxygen content at a level of no higher than 10 μg/L during operation under load. The microflame burners in the heat recovery boiler enable the independent adjustment of the electrical power and the thermal power output from the PGU-20/25T plant. All the innovative equipment has been tested on experimental prototypes.

V N Vinogradov - One of the best experts on this subject based on the ideXlab platform.

  • Water deaeration in Water cooling systems of the stator winding in a turbogenerator with hydrogen Water cooling
    Thermal Engineering, 2018
    Co-Authors: G V Ledukhovsky, Yu E Barochkin, V. P. Zhukov, V N Vinogradov, I A Shatova
    Abstract:

    Results of experimental investigations performed on 210–1200 MWel. power units at thermal and nuclear power stations yielded a statistical correlation of the corrosion rate for cooled copper conductors in Water-cooling systems of the stator winding in a hydrogen-Water cooled generator vs. cooling Water quality characteristics, such as electrical conductivity, pH, and dissolved oxygen content. The content of dissolved oxygen in the cooling Water is found to have a pronounced effect on the efficiency of corrosion protection of system elements. An engineering solution is proposed. It calls for installation of a small cavitation deaerator operating on superheated Water in the cooling Water return pipeline from the turbogenerator stator winding to a vacuum tank from which steam is removed by the main ejector of the turbine unit condenser or the deaerator’s own ejector. Special experimental investigations allowed the determination of the Water deaeration efficiency in deaerators of the considered type. It is described by a dependence of a relative decrease in the content by weight of oxygen dissolved in the Deaerated Water on the Water overheating at the deaerator inlet with reference to saturation temperature corresponding to the pressure in the steam suction pipeline. It was established by calculations that the proposed engineering solution decreased the corrosion rate of copper conductors in Water-cooling systems of the stator winding, on average, by a factor of 2.1. Results of this investigation can be used in designing new power facilities or retrofitting process systems of operating hydrogen-Water cooled turbogenerators.

  • Predicting the indicators characterizing the Water decarbonization efficiency when using atmospheric-pressure thermal deaerators without subjecting Water to steam bubbling in the deaerator tank
    Thermal Engineering, 2015
    Co-Authors: G.v. Leduhovsky, V N Vinogradov, S.d. Gorshenin, E. V. Barochkin, A. A. Korotkov
    Abstract:

    The results obtained from combined numerical and experimental investigations of the Water decarbonization process carried out in atmospheric-pressure deaerators without subjecting Water to steam bubbling in the deaerator tank are presented. More exact values of the hydrocarbonate thermal decomposition rate have been obtained, and the hypothesis about a change of the process governing mechanism in shifting to low total alkalinity values of Deaerated Water has been proven in the course of these investigations. A procedure for predicting the indicators characterizing the Water decarbonization efficiency in using deaerators is proposed based on the obtained study results. The developed procedure features the maximally possible accuracy that can be achieved at the metrological characteristics of the standard alkalinity measurement methods.