Efficiency of two-stage heating of water on CHP plant with turbines of type T-250/300-240

2019 ◽  
Vol 12 (3) ◽  
pp. 213-219
Author(s):  
E. T. Ilin ◽  
S. P. Pechenkin ◽  
A. V. Svetushkov ◽  
J. A. Kozlova
Keyword(s):  
Transition Period ◽  
Steam Pressure ◽  
Low Pressure ◽  
Heat Extraction ◽  
Two Stage ◽  
Permissible Level ◽  
Lower Heat ◽  
Operational Modes ◽  
Extraction Section ◽  
Supply Water

During non-heating and transition period, most of cogeneration turbines operate with a lower heat extraction section actuated only due to a number of restrictions on the maximum and minimum pressure levels in the upper and lower heat extraction sections at operation of the turbine. For turbines of model T-250/300-240, the minimum permissible level of steam pressure in the upper heat extraction section, according to manufacturer data, is set to 0.06 MPa. During the non-heating and transition period, the supply water temperature is usually set in the range of 70–75°С. In order to maintain that temperature of supply water, the steam pressure in the upper heat extraction section should be below the minimum permissible level. As a result, the turbine operates with only the low-pressure heat extraction section actuated, which ensures operation without restrictions, but with a lower efficiency. The authors have introduced a set of measures, which enable to avoid those restrictions and implement two-stage heating of supply water. In this case, on connection of the upper heating extraction section, the pressure in the same is maintained at the minimum permissible level. Heat output characteristics are provided by having some of supply water delivered bypassing the group of network heaters. This operational mode enables to increase the turbine actual heat drop, to reduce the cooling steam flow into the low-pressure section and, accordingly, into the condenser, and to reduce temperature drops in network water heaters. Results of the research of operational modes for turbines of type T-250/300-240 in the non-heating and transition period with one and two-stage heating are provided. The economic efficiency of proposed operational modes was researched, which shows the effectiveness of those modes during non-heating and transition period. The limits of the efficiency of using these modes are determined.

scholarly journals Application of a Two-Stage Steam Jet Injector Unit for Latent Heat Recovery of a Marine Steam Turbine Propulsion Plant

2021 ◽  
Vol 11 (12) ◽  
pp. 5511
Author(s):  
Szymon Grzesiak ◽  
Andrzej Adamkiewicz
Keyword(s):  
Steam Turbine ◽  
Steam Pressure ◽  
Relative Increase ◽  
Parameters Optimization ◽  
Feed Water ◽  
Water Heating ◽  
Two Stage ◽  
Heating Systems ◽  
Heating Steam ◽  
Numerical Research

The paper presents the results of the numerical research of the steam jet injector applications for the regenerative feed water heating systems of marine steam turbine propulsion plants. The analysis shows that the use of a single injector for a single heat exchanger results in a relative increase in the thermal efficiency of the plant by 0.6–0.9%. The analysis also indicates the legitimacy of the usage of multistage feed water heating systems, which would enable the operating parameters optimization of the injectors. The obtained steam pressure up to the value of 1.8 barA allows for the heating of the feed water up to 110 °C. For higher degrees of feed water heating in the heat exchangers, it is necessary to supply heating steam of higher pressure. Therefore, the usage of two-stage steam jet injector units was considered advisable for the analyses.

scholarly journals Optimization of Powerful Two-stage Screw Centrifugal Pump

2018 ◽  
Vol 220 ◽  
pp. 03009 ◽  
Author(s):  
Oleg Baturin ◽  
Grigorii Popov ◽  
Daria Kolmakova ◽  
Vasilii Zubanov ◽  
Julia Novikova ◽  
...  
Keyword(s):  
High Pressure ◽  
Centrifugal Pump ◽  
Mathematical Optimization ◽  
Pressure Head ◽  
Low Pressure ◽  
Calculation Model ◽  
Pump Efficiency ◽  
Rotor Speed ◽  
Two Stage ◽  
Optimization Parameters

The article presents a refining method for a two-stage screw centrifugal pump by the joint usage of mathematical optimization software IOSO, meshing complex NUMECA and CFD software ANSYS CFX. The pump main parameters: high-pressure stage rotor speed was 13300 rpm; low-pressure rotor speed was 3617 rpm by gearbox; inlet total pressure was 0.4 MPa; outlet mass flow was 132.6 kg/s at the nominal mode. This article describes the process of simplifying the calculation model for the optimization. The parameters of camber lines of the low-pressure impeller, transition duct, and high-pressure impeller blades for two sections (hub and shroud) were chosen as optimization parameters. The blades of low-pressure impeller, transition duct and high-pressure impeller have changed during optimization. The optimization goal was the increase of the pump efficiency with preservation or slight increase in the pressure head. The efficiency was increased by 3%.

Postcombustion CO2 Capture for Combined Cycles Utilizing Hot-Water Absorbent Regeneration

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Klas Jonshagen ◽  
Majed Sammak ◽  
Magnus Genrup
Keyword(s):  
Power Plant ◽  
Temperature Difference ◽  
Co2 Capture ◽  
Steam Pressure ◽  
Low Pressure ◽  
Pressure Level ◽  
Combined Cycle ◽  
Hot Water ◽  
Combined Cycle Power Plant ◽  
Pressure Plant

The partly hot-water driven CO2 capture plant offers a significant potential for improvement in performance when implemented in a combined-cycle power plant (CCPP). It is possible to achieve the same performance with a dual-pressure steam cycle as in a triple-pressure unit. Even a single-pressure plant can attain an efficiency competitive with that achievable with a triple-pressure plant without the hot-water reboiler. The underlying reasons are better heat utilization in the heat recovery unit and less steam extraction to the absorbent regenerating unit(s). In this paper, the design criteria for a combined cycle power plant utilizing hot-water absorbent regeneration will be examined and presented. The results show that the most suitable plant is one with two steam pressure levels. The low-pressure level should be much higher than in a conventional combined cycle in order to increase the amount of heat available in the economizer. The external heat required in the CO2 capture plant is partly supplied by the economizer, allowing temperature optimization in the unit. The maximum value of the low-pressure level is determined by the reboiler, as too great a temperature difference is unfavorable. This work evaluates the benefits of coupling the economizer and the reboiler in a specially designed CCPP. In the CO2 separation plant both monoethanolamine (MEA) and ammonia are evaluated as absorbents. Higher regeneration temperatures can be tolerated in ammonia-based plants than in MEA-based plants. When using a liquid heat carrier the reboiler temperature is not constant on the hot side, which results in greater temperature differences. The temperature difference can be greatly reduced by dividing the regeneration process into two units operating at different pressures. The possibility of extracting more energy from the economizer to replace part of the extracted steam increases the plant efficiency. The results show that very high efficiencies can be achieved without using multiple pressure-levels.

Application of a miniaturized solid state electrolyte sensor for tracer gas measurements in a two-stage low pressure turbine

2017 ◽  
Vol 82 ◽  
pp. 367-374 ◽  
Author(s):  
Marcel Günter ◽  
Frank Hammer ◽  
Christian Koch ◽  
Klaus Kuhn ◽  
Martin G. Rose ◽  
...  
Keyword(s):  
Solid State ◽  
Low Pressure ◽  
Tracer Gas ◽  
Two Stage ◽  
Solid State Electrolyte ◽  
Low Pressure Turbine ◽  
Gas Measurements

Influence of Aerodynamic Loading on Rotor-Stator Aerodynamic Interaction in a Two-Stage Low Pressure Research Turbine

2006 ◽  
Author(s):  
Edward Canepa ◽  
Piergiorgio Formosa ◽  
Davide Lengani ◽  
Daniele Simoni ◽  
Marina Ubaldi ◽  
...  
Keyword(s):  
Turbulence Intensity ◽  
Low Pressure ◽  
Potential Interaction ◽  
Two Stage ◽  
Average Technique ◽  
High Lift ◽  
Second Stage ◽  
Aerodynamic Loading ◽  
Aerodynamic Interaction ◽  
Blade Row

The unsteady flow within a two-stage low-pressure research turbine equipped with high lift profiles has been investigated in detail for three different aerodynamic loading conditions. Experiments have been carried out at low speed. Velocity and turbulence intensity in the blade-to-blade plane at midspan have been measured by means of a crossed hot-wire probe, upstream and downstream of each blade row. The probe has been traversed circumferentially over 1.5 bladings pitch and the phase-locked data acquisition and ensemble average technique have been used to reconstruct the flow in space and time. The effects of multistage configuration have been identified and analyzed by considering the velocity components and turbulence intensity. Potential interaction from the downstream blading in relative motion, periodic wake perturbations from the upstream blading and preceding stage perturbations make the flow in the second stage extremely complex. Overall the flow downstream of rotors is perturbed in space by upstream and downstream stators, while flow downstream of stators is mostly perturbed in time by rotor effects. As expected, high lift profiles are significantly sensitive to incidence variation, with this effect further enhanced by the multistage cumulative interactions.

scholarly journals Method of calculation of energy characteristics heat turbines taking into account the economy of the low pressure flow part

Vestnik IGEU ◽  
2020 ◽  
pp. 5-13
Author(s):  
K.N. Bubnov ◽  
A.E. Barochkin ◽  
V.P. Zhukov ◽  
G.V. Ledukhovsky
Keyword(s):  
Heat Recovery ◽  
Low Pressure ◽  
Reasonable Accuracy ◽  
Two Stage ◽  
Pressure Flow ◽  
Energy Characteristics ◽  
Network Water ◽  
The Matrix ◽  
Flow Part ◽  
Efficiency Indicators

Thermal power plants require regular review of regulatory energy performance. Data sources for this can be the results of thermal tests or typical energy characteristics of units. The first way is costly, the second only partially allows taking into account the technical condition of the equipment. An urgent task is to develop a methodology for constructing energy characteristics that would make it possible to solve this problem with reasonable accuracy and using minimal resources. Such conditions are met by the existing methodology for determining the energy characteristics of turbines which is based on the methodology of matrix formalization of the calculation of energy-mass-exchange plants. The technique has been tested in relation to turbines with one-stage heat recovery. The aim of this study is to increase the accuracy of the calculation using the developed methodology for the energy characteristics of turbines with two-stage heat recovery. The turbine installation is simulated within the framework of the matrix formalization methodology using the equations of mass and energy balances solved by mathematical programming methods. The energy charac-teristics of the equipment are determined in accordance with the existing regulatory approach. The methodology for determining the energy characteristics of turbine plants developed in the framework of the matrix formalization meth-odology has been extended to the case of calculating steam turbines with two-stage heating selection by taking into account the dependence of the efficiency indicators of the low-pressure flow part on the position of the control diaphragm for different modes of heating network water. The results of test calculations with reasonable accuracy coincided with the energy characteristics of the operating turbine. For modes with one- and two-stage heating of network water, it is advisable to use different methods of accounting for the efficiency indicators of the low-pressure flow part. In this case, the introduction of the dependence of the internal relative efficiency of the low pressure part on the relative volumetric steam flow into the model for the regime with two-stage heating of network water allows achieving accuracy acceptable for solving practical problems.

Influence of Aerodynamic Loading on Rotor-Stator Aerodynamic Interaction in a Two-Stage Low Pressure Research Turbine

2006 ◽  
Vol 129 (4) ◽  
pp. 765-772 ◽  
Author(s):  
Edward Canepa ◽  
Piergiorgio Formosa ◽  
Davide Lengani ◽  
Daniele Simoni ◽  
Marina Ubaldi ◽  
...  
Keyword(s):  
Turbulence Intensity ◽  
Low Pressure ◽  
Potential Interaction ◽  
Two Stage ◽  
Average Technique ◽  
High Lift ◽  
Second Stage ◽  
Aerodynamic Loading ◽  
Aerodynamic Interaction ◽  
Blade Row

The unsteady flow within a two-stage low-pressure research turbine equipped with high lift profiles has been investigated in detail for three different aerodynamic loading conditions. Experiments have been carried out at low speed. Velocity and turbulence intensity in the blade-to-blade plane at midspan have been measured by means of a crossed hot-wire probe, upstream and downstream of each blade row. The probe has been traversed circumferentially over 1.5 bladings pitch and the phase-locked data acquisition and ensemble average technique have been used to reconstruct the flow in space and time. The effects of multistage configuration have been identified and analyzed by considering the velocity components and turbulence intensity. Potential interaction from the downstream blading in relative motion, periodic wake perturbations from the upstream blading and preceding stage perturbations make the flow in the second stage extremely complex. Overall the flow downstream of rotors is perturbed in space by upstream and downstream stators, while flow downstream of stators is mostly perturbed in time by rotor effects. As expected, high lift profiles are significantly sensitive to incidence variation, with this effect further enhanced by the multistage cumulative interactions.

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