The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

Sławomir Dykas - One of the best experts on this subject based on the ideXlab platform.

  • Calculation of a 900 MW conceptual 700/720ºC coal-fired power unit with an auxiliary extraction-backpressure turbine
    Journal of Power of Technologies, 2012
    Co-Authors: Katarzyna Stępczyńska, Sławomir Dykas, Łukasz Kowalczyk, Witold Elsner
    Abstract:

    This paper presents the calculations for different configurations of a 900 MW power unit for advanced 700/720°C ultra-supercritical steam parameters with a single and double steam Reheat. The use of such high parameters, especially the Reheated steam temperature, involves thermodynamic and material problems related to high temperature differences in the feed water heaters. In relation to this, a concept of the modification of the feed water heaters system by using an auxiliary extraction-backpressure turbine fed with steam from the Cold Reheat steam line is presented. The steam from the bleeds and the turbine outlet is directed to regenerative heaters fed in the classical system from the intermediate pressure turbine, which reduces the temperature differences in these exchangers and simplifies the main turbine IP part structure.

  • Thermo-Economic Analysis of the Ultra-Supercritical 900 MW Power Unit With the Various Configurations of the Auxiliary Steam Turbine
    Volume 3: Cycle Innovations; Education; Electric Power; Fans and Blowers; Industrial and Cogeneration, 2012
    Co-Authors: Katarzyna Stępczyńska, Henryk Łukowicz, Sławomir Dykas, Sebastian Rulik
    Abstract:

    Coal-based electric power generation remains the basic source of obtaining energy. With increasing pressure to reduce CO2 emissions, improving power unit efficiency has become an issue of utmost significance. The development of technologies related to coal-fired power units does not focus solely on the steam parameters ahead of the turbine. Increasing the live steam parameters usually constitutes the greatest contribution to the rise in the efficiency of a power unit, but the sum of efficiency gains related to the application of other solutions can also be significant and can, in some cases, exceed the effects related to raising the temperature and steam pressure values. A paper presents thermodynamic and economic analysis of various configurations of the ultra-supercritical coal-fired 900 MW power unit with the auxiliary steam turbine. Main subject of research was a power unit considered within the Strategic Research Programme – Advanced Technologies for Energy Generation with the parameters of live and Reheat steam: 30 MPa/650°C/670°C. The base configuration of the power unit has single steam Reheat and electric drive boiler feed pump. Analysis of ultra-supercritical 900 MW power unit involves configuration with a single and double Reheat. The following configurations of the auxiliary steam turbine will be presented and compared:• extraction-backpressure steam turbine fed with steam from Cold Reheat line with bleed and steam outlet directed to the feed water heaters;• extraction-backpressure steam turbine fed with steam from Cold Reheat line with bleed and steam outlet directed to the feed water heaters; the auxiliary turbine drives the boiler feed pump;• backpressure turbine fed with steam from a hot Reheat steam line operating in parallel with the intermediate-pressure turbine; the auxiliary turbine drives the boiler feed pump.The analysis of the operation of the 900 MW unit was carried out for three load levels: for the nominal mass flow of live steam, and for the partial mass flow of 75% and 50%. For all presented solutions thermodynamic and economic analysis was performed, which has taken into account the charge for CO2 emissions.© 2012 ASME

  • Diverse configurations of the boiler feed pump drive for the ultra-supercritical 900-MW steam plant
    International Journal of Energy and Environmental Engineering, 2012
    Co-Authors: Katarzyna Stępczyńska, Henryk Łukowicz, Sławomir Dykas
    Abstract:

    Coal-based electric power generation remains the basic source of obtaining energy. With increasing pressure to reduce CO_2 emissions, improving power unit efficiency has become an issue of utmost significance. Surely, one of the possibilities to improve the efficiency of new power units is raising the steam parameters. With improved power plant efficiency, there is a lower demand for power of almost all auxiliary equipment except the boiler feed pump. The reason for this is that the power needed to drive the feed pump is an almost linear function of the steam pressure. This means that, even though the steam mass flow (and, consequently, the feed water mass flow) is reduced and the efficiency of feed pumps is improved, their power increases. For this reason, it is very important to find the optimum drive of the boiler feed pump. The main aim of the conducted analysis was to compare various drive options of the boiler feed pump for a conceptual ultra-supercritical 900-MW steam power unit. The following drive configurations of the boiler feed pump were presented and compared: · A frequency-controlled electric motor · A condensing turbine fed with steam extraction from the immediate-pressure turbine · An extraction-backpressure turbine fed with steam from a Cold Reheat steam line with bleeds shifted from the low-pressure turbine · A backpressure turbine fed with steam from a hot Reheat steam line operating in parallel with the intermediate-pressure turbine · An extraction-backpressure turbine fed with steam from a Cold Reheat steam line with bleeds shifted from the intermediate-pressure turbine (the master cycle idea). The analysis of the operation of the 900-MW unit with various configurations of the feed pump drive was carried out for three load levels: for the nominal mass flow of live steam and for the partial mass flow of 75% and 50%.

Katarzyna Stępczyńska - One of the best experts on this subject based on the ideXlab platform.

  • Calculation of a 900 MW conceptual 700/720ºC coal-fired power unit with an auxiliary extraction-backpressure turbine
    Journal of Power of Technologies, 2012
    Co-Authors: Katarzyna Stępczyńska, Sławomir Dykas, Łukasz Kowalczyk, Witold Elsner
    Abstract:

    This paper presents the calculations for different configurations of a 900 MW power unit for advanced 700/720°C ultra-supercritical steam parameters with a single and double steam Reheat. The use of such high parameters, especially the Reheated steam temperature, involves thermodynamic and material problems related to high temperature differences in the feed water heaters. In relation to this, a concept of the modification of the feed water heaters system by using an auxiliary extraction-backpressure turbine fed with steam from the Cold Reheat steam line is presented. The steam from the bleeds and the turbine outlet is directed to regenerative heaters fed in the classical system from the intermediate pressure turbine, which reduces the temperature differences in these exchangers and simplifies the main turbine IP part structure.

  • Thermo-Economic Analysis of the Ultra-Supercritical 900 MW Power Unit With the Various Configurations of the Auxiliary Steam Turbine
    Volume 3: Cycle Innovations; Education; Electric Power; Fans and Blowers; Industrial and Cogeneration, 2012
    Co-Authors: Katarzyna Stępczyńska, Henryk Łukowicz, Sławomir Dykas, Sebastian Rulik
    Abstract:

    Coal-based electric power generation remains the basic source of obtaining energy. With increasing pressure to reduce CO2 emissions, improving power unit efficiency has become an issue of utmost significance. The development of technologies related to coal-fired power units does not focus solely on the steam parameters ahead of the turbine. Increasing the live steam parameters usually constitutes the greatest contribution to the rise in the efficiency of a power unit, but the sum of efficiency gains related to the application of other solutions can also be significant and can, in some cases, exceed the effects related to raising the temperature and steam pressure values. A paper presents thermodynamic and economic analysis of various configurations of the ultra-supercritical coal-fired 900 MW power unit with the auxiliary steam turbine. Main subject of research was a power unit considered within the Strategic Research Programme – Advanced Technologies for Energy Generation with the parameters of live and Reheat steam: 30 MPa/650°C/670°C. The base configuration of the power unit has single steam Reheat and electric drive boiler feed pump. Analysis of ultra-supercritical 900 MW power unit involves configuration with a single and double Reheat. The following configurations of the auxiliary steam turbine will be presented and compared:• extraction-backpressure steam turbine fed with steam from Cold Reheat line with bleed and steam outlet directed to the feed water heaters;• extraction-backpressure steam turbine fed with steam from Cold Reheat line with bleed and steam outlet directed to the feed water heaters; the auxiliary turbine drives the boiler feed pump;• backpressure turbine fed with steam from a hot Reheat steam line operating in parallel with the intermediate-pressure turbine; the auxiliary turbine drives the boiler feed pump.The analysis of the operation of the 900 MW unit was carried out for three load levels: for the nominal mass flow of live steam, and for the partial mass flow of 75% and 50%. For all presented solutions thermodynamic and economic analysis was performed, which has taken into account the charge for CO2 emissions.© 2012 ASME

  • Diverse configurations of the boiler feed pump drive for the ultra-supercritical 900-MW steam plant
    International Journal of Energy and Environmental Engineering, 2012
    Co-Authors: Katarzyna Stępczyńska, Henryk Łukowicz, Sławomir Dykas
    Abstract:

    Coal-based electric power generation remains the basic source of obtaining energy. With increasing pressure to reduce CO_2 emissions, improving power unit efficiency has become an issue of utmost significance. Surely, one of the possibilities to improve the efficiency of new power units is raising the steam parameters. With improved power plant efficiency, there is a lower demand for power of almost all auxiliary equipment except the boiler feed pump. The reason for this is that the power needed to drive the feed pump is an almost linear function of the steam pressure. This means that, even though the steam mass flow (and, consequently, the feed water mass flow) is reduced and the efficiency of feed pumps is improved, their power increases. For this reason, it is very important to find the optimum drive of the boiler feed pump. The main aim of the conducted analysis was to compare various drive options of the boiler feed pump for a conceptual ultra-supercritical 900-MW steam power unit. The following drive configurations of the boiler feed pump were presented and compared: · A frequency-controlled electric motor · A condensing turbine fed with steam extraction from the immediate-pressure turbine · An extraction-backpressure turbine fed with steam from a Cold Reheat steam line with bleeds shifted from the low-pressure turbine · A backpressure turbine fed with steam from a hot Reheat steam line operating in parallel with the intermediate-pressure turbine · An extraction-backpressure turbine fed with steam from a Cold Reheat steam line with bleeds shifted from the intermediate-pressure turbine (the master cycle idea). The analysis of the operation of the 900-MW unit with various configurations of the feed pump drive was carried out for three load levels: for the nominal mass flow of live steam and for the partial mass flow of 75% and 50%.

Dipak K. Sarkar - One of the best experts on this subject based on the ideXlab platform.

  • Floating of Steam Generator Safety Valves
    Thermal Power Plant, 2020
    Co-Authors: Dipak K. Sarkar
    Abstract:

    To meet statutory requirements of a boiler inspectorate or regulatory authority, spring-loaded safety valves are installed on boiler drum/steam separator outlet, main steam, Cold Reheat, and hot Reheat pipe lines. Safety valves ensure continued safe operation of steam generators against overpressure. Total relieving capacity of all safety valves is equal to or more than BMCR steam generating capacity. Electrically assisted relief valves are installed on main steam and hot Reheat pipe lines. Each safety valve is provided with an escape pipe, drain pan, and silencer. Setting of safety valves is adjusted before a steam generator is started in normal operation. Either a “full set pressure valve actuation” (most reliable technique) or “lift-assist device” (normal operating pressure method) is used for floating of safety valves.

  • steam air blowing of main steam Cold Reheat hot Reheat and other steam pipe lines
    Thermal Power Plant#R##N#Pre-Operational Activities, 2017
    Co-Authors: Dipak K. Sarkar
    Abstract:

    Steam turbine performances are greatly affected by the presence of any debris in main steam and Reheat steam. Impingement of suspended particles on turbine blades may lead to blade failure. “Steam” or “compressed air” is used to blow-out various steam pipe lines to remove rust, mill scales, loose pieces of scales, welding slag left over in pipe lines. Two different methods—“continuous blowing” and “puffing,” are used in blowing of steam pipe lines. Disturbance effect, K , of any suspended particulate matter during blowing must be greater than the disturbance effect experienced by the particle under BMCR. Value of K should be about 1.3–1.6 during steam blowing and 1.2–1.3 during compressed air blowing. Completion of blowing-out process is assessed by the degree of indentation made on target plates.

  • Steam/Air Blowing of Main Steam, Cold Reheat, Hot Reheat and Other Steam Pipe Lines
    Thermal Power Plant, 2017
    Co-Authors: Dipak K. Sarkar
    Abstract:

    Steam turbine performances are greatly affected by the presence of any debris in main steam and Reheat steam. Impingement of suspended particles on turbine blades may lead to blade failure. “Steam” or “compressed air” is used to blow-out various steam pipe lines to remove rust, mill scales, loose pieces of scales, welding slag left over in pipe lines. Two different methods—“continuous blowing” and “puffing,” are used in blowing of steam pipe lines. Disturbance effect, K , of any suspended particulate matter during blowing must be greater than the disturbance effect experienced by the particle under BMCR. Value of K should be about 1.3–1.6 during steam blowing and 1.2–1.3 during compressed air blowing. Completion of blowing-out process is assessed by the degree of indentation made on target plates.

Henryk Łukowicz - One of the best experts on this subject based on the ideXlab platform.

  • Thermo-Economic Analysis of the Ultra-Supercritical 900 MW Power Unit With the Various Configurations of the Auxiliary Steam Turbine
    Volume 3: Cycle Innovations; Education; Electric Power; Fans and Blowers; Industrial and Cogeneration, 2012
    Co-Authors: Katarzyna Stępczyńska, Henryk Łukowicz, Sławomir Dykas, Sebastian Rulik
    Abstract:

    Coal-based electric power generation remains the basic source of obtaining energy. With increasing pressure to reduce CO2 emissions, improving power unit efficiency has become an issue of utmost significance. The development of technologies related to coal-fired power units does not focus solely on the steam parameters ahead of the turbine. Increasing the live steam parameters usually constitutes the greatest contribution to the rise in the efficiency of a power unit, but the sum of efficiency gains related to the application of other solutions can also be significant and can, in some cases, exceed the effects related to raising the temperature and steam pressure values. A paper presents thermodynamic and economic analysis of various configurations of the ultra-supercritical coal-fired 900 MW power unit with the auxiliary steam turbine. Main subject of research was a power unit considered within the Strategic Research Programme – Advanced Technologies for Energy Generation with the parameters of live and Reheat steam: 30 MPa/650°C/670°C. The base configuration of the power unit has single steam Reheat and electric drive boiler feed pump. Analysis of ultra-supercritical 900 MW power unit involves configuration with a single and double Reheat. The following configurations of the auxiliary steam turbine will be presented and compared:• extraction-backpressure steam turbine fed with steam from Cold Reheat line with bleed and steam outlet directed to the feed water heaters;• extraction-backpressure steam turbine fed with steam from Cold Reheat line with bleed and steam outlet directed to the feed water heaters; the auxiliary turbine drives the boiler feed pump;• backpressure turbine fed with steam from a hot Reheat steam line operating in parallel with the intermediate-pressure turbine; the auxiliary turbine drives the boiler feed pump.The analysis of the operation of the 900 MW unit was carried out for three load levels: for the nominal mass flow of live steam, and for the partial mass flow of 75% and 50%. For all presented solutions thermodynamic and economic analysis was performed, which has taken into account the charge for CO2 emissions.© 2012 ASME

  • Diverse configurations of the boiler feed pump drive for the ultra-supercritical 900-MW steam plant
    International Journal of Energy and Environmental Engineering, 2012
    Co-Authors: Katarzyna Stępczyńska, Henryk Łukowicz, Sławomir Dykas
    Abstract:

    Coal-based electric power generation remains the basic source of obtaining energy. With increasing pressure to reduce CO_2 emissions, improving power unit efficiency has become an issue of utmost significance. Surely, one of the possibilities to improve the efficiency of new power units is raising the steam parameters. With improved power plant efficiency, there is a lower demand for power of almost all auxiliary equipment except the boiler feed pump. The reason for this is that the power needed to drive the feed pump is an almost linear function of the steam pressure. This means that, even though the steam mass flow (and, consequently, the feed water mass flow) is reduced and the efficiency of feed pumps is improved, their power increases. For this reason, it is very important to find the optimum drive of the boiler feed pump. The main aim of the conducted analysis was to compare various drive options of the boiler feed pump for a conceptual ultra-supercritical 900-MW steam power unit. The following drive configurations of the boiler feed pump were presented and compared: · A frequency-controlled electric motor · A condensing turbine fed with steam extraction from the immediate-pressure turbine · An extraction-backpressure turbine fed with steam from a Cold Reheat steam line with bleeds shifted from the low-pressure turbine · A backpressure turbine fed with steam from a hot Reheat steam line operating in parallel with the intermediate-pressure turbine · An extraction-backpressure turbine fed with steam from a Cold Reheat steam line with bleeds shifted from the intermediate-pressure turbine (the master cycle idea). The analysis of the operation of the 900-MW unit with various configurations of the feed pump drive was carried out for three load levels: for the nominal mass flow of live steam and for the partial mass flow of 75% and 50%.

Teemu Sihvonen - One of the best experts on this subject based on the ideXlab platform.

  • modeling and analysis of process configurations for hybrid concentrated solar power and conventional steam power plants
    Energy Conversion and Management, 2017
    Co-Authors: Suvi Suojanen, Elina Hakkarainen, Matti Tahtinen, Teemu Sihvonen
    Abstract:

    Abstract Availability and flexibility of variable renewable energy production can be increased without thermal energy storages by integrating intermittent energy production with load following energy production. This paper focuses on modeling, analysis and comparison of three hybrid configurations for concentrated solar power and conventional steam power plants. The configurations include feedwater pReheating, Cold Reheat line and high pressure turbine concepts, in which linear Fresnel collector solar field with direct steam generation is applied to generate steam parallel with the steam boiler. The modeling is conducted using dynamic simulation software Apros®, which enables investigation of the system operation under varying process conditions. In particular, the focus is on the comparison of thermal load balance and interdependencies of the subsystems. In addition, the focus is on increasing the solar contribution, as the solar share is low in current commercial concepts. As a main conclusion, the more solar steam is fed to the system, the more different turbine sections and heat surfaces of the steam boiler are imbalanced, which leads to challenging system design. In addition, the maximum fuel and emission savings are not only determined by the achievable solar share, but also by the hybrid process design. The design of the hybrid system has to be optimized and modified according to the configuration in order to achieve higher peak solar share and fuel and emission savings than 20% achieved in this study.