THERMODYNAMIC CHARACTERISTICS OF MICROGAS TURBINE ENGINES COMBINED CYCLES FOR DISTRIBUTED ENERGY

2020 ◽  
Vol 4 (1) ◽  
pp. 28-41
Author(s):  
A.V. DOLOGLONYAN ◽  
V.T. MATVEENKO
Keyword(s):  
Renewable Energy Sources ◽  
Organic Rankine Cycle ◽  
Thermodynamic Characteristics ◽  
Rankine Cycle ◽  
Turbine Engines ◽  
Energy Sources ◽  
Distributed Energy ◽  
Combined Cycles ◽  
The Subject ◽  
Basic Configuration

The subject of this article is methods of complicating the cycles of microgas turbine plants (MGTP) in order to further increase their efficiency. The direction of a deeper utilization of the heat of exhaust gases from MGTP was chosen, turning it into work in the organic Rankine cycle (OCR) plant. It has been established that the costeffectiveness of MGTP with OCR is dependent on the configuration of MGTP, OCR and the type of refrigerant and is higher than the basic configuration of MGTP by 4... 15%. It is shown that to increase the versatility of combined MGTP, it is possible to use plants with a switching heat flow, supplemented by renewable energy sources, to conduct separate optimization of the basic MGTP and the OCR plant.

USE OF LOCAL COLD CLIMATE RESOURCES IN COMBINED CYCLES OF MICROGAS TURBINE ENGINES FOR DISTRIBUTED POWER ENGINEERING

2020 ◽  
Vol 4 (2) ◽  
pp. 124-135
Author(s):  
A.V. DOLOGLONYAN ◽  
V.T. MATVIIENKO
Keyword(s):  
Steam Turbine ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Decomposition Temperature ◽  
Cold Climate ◽  
Turbine Engines ◽  
Temperature Potential ◽  
Combined Cycles ◽  
The Subject ◽  
R 134A

The subject of this article is methods of complicating of microgas turbine plants (MGTP) cycles in order to further increase their efficiency. The direction of a deeper utilization of the heat of exhaust gases of MGTP was chosen, turning it into work in the organic Rankine cycle (OCR) plant, as well as the use of local climatic cold resources. It has been established that the use of an additional steam turbine as part of the OCR combined MGTP allows to increase its efficiency from October to March on 2... 4% depending on the configuration of the basic MGTP, which ensures an increase in the average annual efficiency on 1... 2%. It is shown that the OCR plant on R-134a does not allow the full use of the temperature potential of the gases of the base MGTP, since the decomposition temperature is lower than the temperature of the gases of the base MGTP, therefore the efficiency of all configurations of combined MGTP using R- 134a is lower than the analogous ones using ammonia on 2... 5%.

THERMODYNAMIC CHARACTERISTICS OF COMBINED CYCLES OF VACUUM MICRO-GAS TURBINE PLANTS OF HEAT AND POWER SUPPLY OF LOCAL OBJECTS

2020 ◽  
Vol 5 ◽  
pp. 21-27
Author(s):  
A.V. DOLOGLONYAN ◽  
D.S. STREBKOV ◽  
V.T. MATVIIENKO ◽  
I.N. STACENKO
Keyword(s):  
Gas Turbine ◽  
Organic Rankine Cycle ◽  
Thermodynamic Characteristics ◽  
Rankine Cycle ◽  
Simple Cycle ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Micro Gas Turbine ◽  
Heat Regeneration ◽  
Combined Cycles

The subject of this article is the use of organic Rankine cycle (ORC) plants to improve the efficiency of vacuum cycles of micro-gas turbine engines (VMGTE). Combined installations VMGTE with ORC of a simple cycle and with heat regeneration have been investigated. The optimal parameters of the plants in the mode of the switching heat flow are found for various working fluids of the ORC. It has been established that the combination of VMGTE with ORC allows to increase the efficiency of plants by 4.2 ... 12.5%, while maintaining cogeneration capabilities. Due to the design features, the combined plant based on a simple cycle can be used for the utilization of secondary energy resources of any potential.

scholarly journals The IRC-PD Tool: A Code to Design Steam and Organic Waste Heat Recovery Units

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5611
Author(s):  
Youcef Redjeb ◽  
Khatima Kaabeche-Djerafi ◽  
Anna Stoppato ◽  
Alberto Benato
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Renewable Energy Sources ◽  
Safety Information ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Industrial Processes ◽  
Working Fluid ◽  
Energy Sources

The Algerian economy and electricity generation sector are strongly dependent on fossil fuels. Over 93% of Algerian exports are hydrocarbons, and approximately 90% of the generated electricity comes from natural gas power plants. However, Algeria is also a country with huge potential in terms of both renewable energy sources and industrial processes waste heat recovery. For these reasons, the government launched an ambitious program to foster renewable energy sources and industrial energy efficiency. In this context, steam and organic Rankine cycles could play a crucial role; however, there is a need for reliable and time-efficient optimization tools that take into account technical, economic, environmental, and safety aspects. For this purpose, the authors built a mathematical tool able to optimize both steam and organic Rankine units. The tool, called Improved Rankine Cycle Plant Designer, was developed in MATLAB environment, uses the Genetic Algorithm toolbox, acquires the fluids thermophysical properties from CoolProp and REFPROP databases, while the safety information is derived from the ASHRAE database. The tool, designed to support the development of both RES and industrial processes waste heat recovery, could perform single or multi-objective optimizations of the steam Rankine cycle layout and of a multiple set of organic Rankine cycle configurations, including the ones which adopt a water or an oil thermal loop. In the case of the ORC unit, the working fluid is selected among more than 120 pure fluids and their mixtures. The turbines’ design parameters and the adoption of a water- or an air-cooled condenser are also optimization results. To facilitate the plant layout and working fluid selection, the economic analysis is performed to better evaluate the plant economic feasibility after the thermodynamic optimization of the cycle. Considering the willingness of moving from a fossil to a RES-based economy, there is a need for adopting plants using low environmental impact working fluids. However, because ORC fluids are subjected to environmental and safety issues, as well as phase out, the code also computes the Total Equivalent Warming Impact, provides safety information using the ASHRAE database, and displays an alert if the organic substance is phased out or is going to be banned. To show the tool’s potentialities and improve the knowledge on waste heat recovery in bio-gas plants, the authors selected an in-operation facility in which the waste heat is released by a 1 MWel internal combustion engine as the test case. The optimization outcomes reveal that the technical, economic, environmental, and safety performance can be achieved adopting the organic Rankine cycle recuperative configuration. The unit, which adopts Benzene as working fluid, needs to be decoupled from the heat source by means of an oil thermal loop. This optimized solution guarantees to boost the electricity production of the bio-gas facility up to 15%.

Polityka klimatyczno-energetyczna Unii Europejskiej

2014 ◽  
pp. 104-121
Author(s):  
Aleksandra Kułaga
Keyword(s):  
Negative Impact ◽  
Renewable Energy Sources ◽  
Energy System ◽  
The Other ◽  
Energy Sources ◽  
Climate Protection ◽  
The European Union ◽  
Eu Member States ◽  
The Subject ◽  
Climate And Energy Policy

The article is devoted to the subject of the goals of the climate and energy policy of the European Union, which can have both a positive, and a negative impact on the environmental and energy policies. Positive aspects are the reduction of greenhouse gas emissions, diversification of energy supplies, which should improve Europe independence from energy imports, and increasing the share of renewable energy sources (RES) in the national energy system structures. On the other hand, overly ambitious targets and actions can lead to large losses for the economies of EU Member States. The article also highlights the realities prevailing in the international arena and noncompliance of international actors with global agreements on climate protection.

Reliable Electricity Generation in RES-Based Microgrids

2019 ◽  
pp. 162-187 ◽  
Author(s):  
Valeriy Kharchenko ◽  
Valentin Gusarov ◽  
Vadim Bolshev
Keyword(s):  
Power Supply ◽  
Rural Areas ◽  
Renewable Energy Sources ◽  
Consumption Patterns ◽  
Energy Sources ◽  
Distributed Energy ◽  
Micro Gas Turbine ◽  
Reliable Power Supply ◽  
Criteria For Selection ◽  
Selection Of

Using microgrid generation technologies is proposed in order to organize reliable power supply to rural areas. The concept of microgrid based on RES is considered as one of the realization forms of the distributed energy paradigm. In this chapter, there are the principles of generating complex formation in any given microgrid considering the specifics of the region, consumption patterns, and the potential of renewable energy sources in a given area. The algorithm for meeting the challenges of forming the structure of the microgrid generating structure is shown. The criteria for selection of power generation sources when solving the issue of their inclusion in the microgrid is proposed. The chapter also suggests the design of the micro gas turbine that is able to operate on biogas.

Biomass combined cycles based on externally fired gas turbines and organic Rankine expanders

2011 ◽  
Vol 225 (8) ◽  
pp. 1066-1075 ◽  
Author(s):  
C M Invernizzi ◽  
P Iora ◽  
R Sandrini
Keyword(s):  
Gas Turbines ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Economic Feasibility ◽  
Maximum Efficiency ◽  
Working Fluid ◽  
Inlet Temperature ◽  
System A ◽  
Combined Cycles

This article investigates the possibility to enhance the performance of a biomass organic Rankine cycle (ORC) plant by adding an externally fired gas turbine (EFGT), yielding a combined EFGT + ORC system. A typical ORC configuration is first modelled and validated on data available from an existing unit 1.5 MW reference plant. Then, different working fluids belonging to the methyl-substituted benzene series and linear methylpolysiloxanes have been evaluated for the ORC section on the basis of both thermodynamics considerations and design issues of the regenerator and the turbine. Results of the simulations of the combined cycle (CC) referred to a furnace size of about unit 9 MW, assuming a maximum GT inlet temperature of 800 °C, show a maximum efficiency of 23 per cent, obtained in the case where toluene is adopted as a working fluid for the bottoming section. This value is about 4 points per cent higher than the efficiency of the corresponding simple ORC. Finally, to conclude, some preliminary considerations are given regarding the techno-economic feasibility of the combined configuration, suggesting the need of a further investigation on the possible technological solution for the furnace which represents the main uncertainty in the resulting costs of the CC.

Thermodynamic and Performance Study of Solar Regenerative Organic Rankine Cycle System for Use in Residential Micro-Combined Heat and Power Generation

2019 ◽  
Author(s):  
Wahiba Yaïci ◽  
Evgueniy Entchev
Keyword(s):  
Power Generation ◽  
Energy Demand ◽  
Waste Heat ◽  
Residential Buildings ◽  
Electrical Power ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Heat And Power ◽  
Energy Sources ◽  
Performance Study

Abstract A continued increase in both energy demand and greenhouse gas emissions (GHGs) call for utilising energy sources effectively. In comparison with traditional energy set-ups, micro-combined heat and power (micro-CHP) generation is viewed as an effective alternative; the aforementioned system’s definite electrical and thermal generation may be attributed to an augmented energy efficiency, decreased capacity as well as GHGs percentage. In this regard, organic Rankine cycle (ORC) has gained increasing recognition as a system, which is capable for generating electrical power from solar-based, waste heat, or thermal energy sources of a lower quality, for instance, below 120 °C. This study focuses on investigating a solar-based micro-CHP system’s performance for use in residential buildings through utilising a regenerative ORC. The analysis will focus on modelling and simulation as well as optimisation of operating condition of several working fluids (WFs) in ORC in order to use a heat source with low-temperature derived from solar thermal collectors for both heat and power generation. A parametric study has been carried out in detail for analysing the effects of different WFs at varying temperatures and flowrates from hot and cold sources on system performance. Significant changes were revealed in the study’s outcomes regarding performance including efficiency as well as power obtained from the expander and generator, taking into account the different temperatures of hot and cold sources for each WF. Work extraction carried out by the expander and electrical power had a range suitable for residential building applications; this range was 0.5–5 kWe with up to 60% electrical isentropic efficiency and up to 8% cycle efficiency for 50–120 °C temperature from a hot source. The operation of WFs will occur in the hot source temperature range, allowing the usage of either solar flat plate or evacuated tube collectors.

Sign in / Sign up

Export Citation Format

Share Document