scholarly journals Biomass cogeneration plants integrated into poultry slaughterhouses for reducing industry costs with energy

2021 ◽  
Vol 43 ◽  
pp. e50967
Author(s):  
Abilio Teixeira de Siqueira ◽  
Edson Bazzo ◽  
Pedro Lo Giudice ◽  
Eduardo Burin
Keyword(s):  
Net Present Value ◽  
Rankine Cycle ◽  
Steam Pressure ◽  
Economic Feasibility ◽  
Base Case ◽  
Payback Time ◽  
Full Load Operation ◽  
Temperature Levels ◽  
Current Price ◽  
Plant Configuration

A technical and economic feasibility analysis was performed concerning biomass cogeneration to supply the thermal and electricity demands of poultry slaughterhouses. The analysis considers measured data referring to the annual energy consumption from an existing industry as well as the characteristics of equipment available in the Brazilian market. The cogeneration plant is equipped with a water tube steam generator and a condensing-extraction steam turbine in a Rankine cycle. Four different configurations were evaluated, including impulse and reaction turbines at two steam pressure/temperature levels (43 bar / 450 °C and 68 bar / 520 °C). A steady state full load operation is considered at cogeneration mode on the weekdays and at Rankine power plant mode on the weekends, when there is no process steam consumption. The technical analysis pointed out the reaction turbine at 68 bar / 520 ºC as the best alternative, leading to the highest overall efficiency. In addition, this plant configuration showed economic advantages represented by an Internal Rate of Return (IRR) of 21%, a Net Present Value (NPV) of US$ 10.93 million, and a payback time of 6 years, enabling a reduction on the industrial cost with energy in the slaughterhouse to 19 US$/ton of product (-30% in comparison to the base case). Finally, the calculated LCOE of 73 US$/MWh was lower than the current price of the electricity in the market, indicating potential economic feasibility of the proposed concept.

scholarly journals Technologies for Waste Heat Recovery in Off-Shore Applications

2013 ◽  
Author(s):  
Leonardo Pierobon ◽  
Fredrik Haglind ◽  
Rambabu Kandepu ◽  
Alessandro Fermi ◽  
Nicola Rossetti
Keyword(s):  
Thermal Efficiency ◽  
Heat Recovery ◽  
Net Present Value ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Present Value ◽  
Payback Time ◽  
Low Weight

In off-shore oil and gas platforms the selection of the gas turbine to support the electrical and mechanical demand on site is often a compromise between reliability, efficiency, compactness, low weight and fuel flexibility. Therefore, recovering the waste heat in off-shore platforms presents both technological and economic challenges that need to be overcome. However, onshore established technologies such as the steam Rankine cycle, the air bottoming cycle and the organic Rankine cycle can be tailored to recover the exhaust heat off-shore. In the present paper, benefits and challenges of these three different technologies are presented, considering the Draugen platform in the North Sea as a base case. The Turboden 65-HRS unit is considered as representative of the organic Rankine cycle technology. Air bottoming cycles are analyzed and optimal design pressure ratios are selected. We also study a one pressure level steam Rankine cycle employing the once-through heat recovery steam generator without bypass stack. We compare the three technologies considering the combined cycle thermal efficiency, the weight, the net present value, the profitability index and payback time. Both incomes related to CO2 taxes and natural gas savings are considered. The results indicate that the Turboden 65-HRS unit is the optimal technology, resulting in a combined cycle thermal efficiency of 41.5% and a net present value of around 15 M$, corresponding to a payback time of approximately 4.5 years. The total weight of the unit is expected to be around 250 ton. The air bottoming cycle without intercooling is also a possible alternative due to its low weight (76 ton) and low investment cost (8.8 M$). However, cycle performance and profitability index are poorer, 12.1% and 0.75. Furthermore, the results suggest that the once-trough single pressure steam cycle has a combined cycle thermal efficiency of 40.8% and net present value of 13.5 M$. The total weight of the steam Rankine cycle is estimated to be around 170 ton.

Economic Analysis Model for Biopower Plants Based on Biomass Logistics Networks and its Application in Heilongjiang Province, China

2012 ◽  
Vol 608-609 ◽  
pp. 356-360
Author(s):  
Jin Zhuo Wu ◽  
Li Hai Wang
Keyword(s):  
Net Present Value ◽  
Economic Feasibility ◽  
Economic Life ◽  
Raw Material ◽  
Base Case ◽  
Analysis Model ◽  
Business Taxes ◽  
Logistics Networks ◽  
Biomass Logistics ◽  
Biomass Availability

A mathematical model was developed to assess the economic feasibility of a biomass-based power plant in the Northeast of China. The objective of this model is to maximizes the net present value (NPV) of a biopower plant over its economic life, which subjects to the constraints of biomass availability, plant investment and operation & maintenance costs, plant capacity, transportation logistics, raw material and product pricing, financing, and business taxes. The model was applied in a biopower plant located in Wangkui County, China, which belongs to the National Bio-Energy Group Company Limited. Results showed that the maximum NPV of the Wangkui Biopower plant in the base case was approximately 117 million Yuan given the electricity sale price of 0.64 Yuan kWh-1 (or 0.75Yuan kWh-1 with tax). This study provides a reference for evaluating the economic feasibility of biopower plants based on biomass logistics networks in China.

Influence of Condenser Conditions on Organic Rankine Cycle Load Characteristics

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Tobias G. Erhart ◽  
Ursula Eicker ◽  
David Infield
Keyword(s):  
Variable Mass ◽  
Organic Rankine Cycle ◽  
District Heating ◽  
Rankine Cycle ◽  
Heating System ◽  
Steam Pressure ◽  
High Mass ◽  
District Heating System ◽  
Mass Flows ◽  
Temperature Levels

A 7 MWth combined heat and power plant (CHP) based on an organic Rankine cycle (ORC) with 5.3 MWth and 1 MWel nominal output is analyzed. A district heating system serves as heat sink; the entire system is heat-led. Two examples for winter and summer operation are shown. The observed characteristics of the condenser are compared to results of a theoretical model. Variable mass flows, temperature levels (72 °C–95 °C) and temperature spreads result in varying condensation temperatures and pressure levels in the condenser (90 mbar to 150 mbar). High mass flows on the secondary side and related low temperature spreads improve the heat transfer and increase the condensation rate in the condenser. The monitoring data support the findings of a steady-state condenser model. As a consequence, advantageous load profiles according to the pressure characteristic of the system can be reached. Live steam pressure, pressure difference across the turbine, and flow rate increase. The effect on the electric efficiency is one percentage point in summer and 1.5 percentage points in winter, which translates to a difference in the electric yield of the cycle of about 10%. Furthermore, the data show that the transient sink conditions cause unsteady operation for the entire cycle.

Economic Feasibility and Comprehensive Evaluation Model Analysis on Solid-Catalyzed Bio-Diesel Production

2012 ◽  
Vol 512-515 ◽  
pp. 515-519
Author(s):  
Yi Wang ◽  
Guan Yi Chen ◽  
Xiao Xiong Zhang ◽  
Li Ping Li ◽  
Bei Bei Yan
Keyword(s):  
Net Present Value ◽  
Comprehensive Evaluation ◽  
Raw Materials ◽  
Evaluation Model ◽  
Economic Feasibility ◽  
Molar Ratio ◽  
Time Dynamic ◽  
Payback Time ◽  
Comprehensive Evaluation Model ◽  
Diesel Production

Considerable attention has been given to bio-diesel as a surrogate to fossil fuel reserves and associated environmental problems of burning them. However, the high costs of bio-diesel production remain the main problem in making it competitive. Bio-diesel and glycerol are obtained by reacting virgin vegetable oil or animal fat with an alcohol in the presence of a catalyst or non-catalyst via transesterification. A conceptual process of heterogeneous SnO-catalyzed transesterification is designed based on the condition of 333K and atmospheric pressure, using methanol and waste oil with a molar ratio of 10:1 as raw materials. In this paper, the economic feasibility analysis based on static payback time, dynamic investment payback period, Financial Net Present Value and Return on Investment, is elaborated for 10kton/y capacity transesterification units. Comprehensive evaluation model on four typical methods are done, taking the following factors into consideration including natural resource utilization, impact on environment, economic feasibility and sustainable development of society. As a result, Heterogeneous acid-catalyzed transesterification seems more transcendent.

scholarly journals Increasing the Energy Efficiency of an Internal Combustion Engine for Ship Propulsion with Bottom ORCs

2020 ◽  
Vol 10 (19) ◽  
pp. 6919
Author(s):  
Melchiorre Casisi ◽  
Piero Pinamonti ◽  
Mauro Reini
Keyword(s):  
Internal Combustion Engine ◽  
Energy Recovery ◽  
Combustion Engine ◽  
Cooling Water ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Ship Propulsion ◽  
Payback Time ◽  
Temperature Levels

The study examines the option of adding a bottom Organic Rankine Cycle (ORC) for energy recovery from an internal combustion engine (ICE) for ship propulsion. In fact, energy recovery from the exhaust gas normally rejected to the atmosphere and eventually from the cooling water circuit (usually rejected to the sea) can significantly reduce the fuel consumption of a naval ICE during its operation. In the paper, different possible bottom ORC configurations are considered and simulated using the Aspen® code. Different working fluids are taken into account, jointly with regenerative and two-temperature levels designs. The energy recovery allowed by each solution is evaluated for different engine load, allowing the identification of the most suitable ORC configuration. For the selected case, the preliminary design of the main heat exchangers is carried out and the off-design performance of the whole combined propulsion plant (ICE + ORC) is evaluated, leading to a preliminary analysis of cost saving during normal ship operation. The results of this analysis show an increase in power output of about 10% and an expected Payback Time of less than 6 years.

scholarly journals Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis

2021 ◽  
Vol 2 (2) ◽  
pp. 237-253
Author(s):  
Raffel Dharma Patria ◽  
Jonathan WC Wong ◽  
Davidraj Johnravindar ◽  
Kristiadi Uisan ◽  
Rajat Kumar ◽  
...  
Keyword(s):  
Food Waste ◽  
Net Present Value ◽  
Scale Up ◽  
Production Capacity ◽  
Economic Feasibility ◽  
Small Scale ◽  
Selling Price ◽  
Internal Rate Of Return ◽  
Process Economics ◽  
Payback Time

The present work evaluates the techno-economic feasibility of a rhamnolipids production process that utilizes digestate from anaerobic digestion (AD) of food waste. Technical feasibility, profitability and extent of investment risks between fermenter scale and its operating strategy for rhamnolipids production was investigated in the present study. Three scenarios were generated and compared: production using a single large fermenter (Scenario I), using two small fermenters operated alternately (Scenario II) or simultaneously (Scenario III). It was found that all the scenarios were economically feasible, and Scenario III was the most profitable since it allowed the most optimum fermenter operation with utilization of multiple small-scale equipment to reduce the downtime of each equipment and increase the production capacity and overall productivity. It had the highest net present value, internal rate of return and shortest payback time at a discount rate of 7%. Finally, a sensitivity analysis was conducted to indicate how the variation in factors such as feedstock (digestate) cost, rhamnolipids selling price, extractant recyclability and process capacity influenced the process economics. The work provides important insights on techno-economic performance of a food waste digestate valorization process which would be useful to guide its sustainable scale-up.

scholarly journals Energetic Investigation and Economic Feasibility for a University Campus in Romania towards Becoming an Energy Supplier

2021 ◽  
Author(s):  
Ali Al Dabbas ◽  
Laith Al-Hyari ◽  
Ahmad D. M. Al Awana ◽  
Mohammad Fawaier
Keyword(s):  
Internal Combustion Engine ◽  
Net Present Value ◽  
Combustion Engine ◽  
Organic Rankine Cycle ◽  
District Heating ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Economic Feasibility ◽  
Energy Supply System ◽  
The University

This research investigates and evaluates the University Politehnica of Bucharest (UPB) possibilities to become an energy self-supplying by building up its own power plant and becoming an energy distributor. The campus has already been connected to the national natural gas supplying pipe and the local district heating and electrical network.A set of criteria was used to evaluate the feasibility of this project. Technical, financial, and environmental considerations were taken into account to determine the most suitable solution. The feasibility study assumed three proposals of an energy supply system considered for the university buildings / campus. Gas-fired heating plant, gas-fired Internal Combustion Engine cogeneration plant and gas fired Internal Combustion Engine for cogeneration with an Organic Rankine Cycle ORC.The details of each proposal were discussed to obtain the optimum solution. Elaborate. It was found from a financial and environmental perspective that the most feasible project is gas-fired Internal Combustion Engine cogeneration, considering profit revenue from selling / exporting power to the domestic electricity grid. And the Net Present Value was around one million euros for 15 years life.

scholarly journals Performance Analysis of a New Electricity and Freshwater Production System Based on an Integrated Gasification Combined Cycle and Multi-Effect Desalination

2020 ◽  
Vol 12 (19) ◽  
pp. 7996 ◽  
Author(s):  
Farzad Hamrang ◽  
Afshar Shokri ◽  
S. M. Seyed Mahmoudi ◽  
Biuk Ehghaghi ◽  
Marc A. Rosen
Keyword(s):  
Parametric Analysis ◽  
Net Present Value ◽  
Performance Metrics ◽  
Waste Heat ◽  
Combined Cycle ◽  
Economic Feasibility ◽  
Performance Criteria ◽  
Base Case ◽  
Present Value ◽  
Integrated Gasification

Integrated biomass gasification combined cycles can be advantageous for providing multiple products simultaneously. A new electricity and freshwater generation system is proposed based on the integrated gasification and gas turbine cycle as the main system, and a steam Rankine cycle and multi-effect desalination system as the waste heat recovery units. To evaluate the performance of the system, energy, exergy, and economic analyses were performed. Also, a parametric analysis was performed to assess the effects of various parameters on the system’s performance criteria. The economic feasibility of the plant was analyzed in terms of net present value. For the base case, the performance metrics are evaluated as W.net=8.347 MW, ε=46.22%, SUCP=14.07 $/GJ, and m.fw=11.7 kg/s. Among all components of the system, the combustion chamber is the greatest contributor to the exergy destruction rate, at 3250 kW. It is shown with the parametric analysis that raising the combustion temperature leads to higher electricity and freshwater production capacity. For a fuel cost of 2 $/GJ and an electricity price of 0.07 $/kWh, the total net present value at the end of plant’s lifespan is 6.547×106 $, and the payback period is 6.75 years. Thus, the plant is feasible from an economic perspective.

scholarly journals Techno-economic feasibility analysis of a 3-kW PV system installation in Nepal

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Ramhari Poudyal ◽  
Pavel Loskot ◽  
Ranjan Parajuli
Keyword(s):  
Net Present Value ◽  
Meteorological Data ◽  
Electric Energy ◽  
Simulation Software ◽  
Economic Feasibility ◽  
Performance Ratio ◽  
Energy Output ◽  
Solar Pv ◽  
Economic Returns ◽  
Pv System

AbstractThis study investigates the techno-economic feasibility of installing a 3-kilowatt-peak (kWp) photovoltaic (PV) system in Kathmandu, Nepal. The study also analyses the importance of scaling up the share of solar energy to contribute to the country's overall energy generation mix. The technical viability of the designed PV system is assessed using PVsyst and Meteonorm simulation software. The performance indicators adopted in our study are the electric energy output, performance ratio, and the economic returns including the levelised cost and the net present value of energy production. The key parameters used in simulations are site-specific meteorological data, solar irradiance, PV capacity factor, and the price of electricity. The achieved PV system efficiency and the performance ratio are 17% and 84%, respectively. The demand–supply gap has been estimated assuming the load profile of a typical household in Kathmandu under the enhanced use of electric appliances. Our results show that the 3-kWp PV system can generate 100% of electricity consumed by a typical residential household in Kathmandu. The calculated levelised cost of energy for the PV system considered is 0.06 $/kWh, and the corresponding rate of investment is 87%. The payback period is estimated to be 8.6 years. The installation of the designed solar PV system could save 10.33 tons of CO2 emission over its lifetime. Overall, the PV systems with 3 kWp capacity appear to be a viable solution to secure a sufficient amount of electricity for most households in Kathmandu city.

scholarly journals Comparison of Li2CO3-Na2CO3-K2CO3, KCl-MgCl2 and NaNO3-KNO3 as heat transfer fluid for different sCO2 and steam power cycles in CSP tower plant under different DNI conditions

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110119
Author(s):  
Kamran Mahboob ◽  
Awais A Khan ◽  
Muhammad Adeel Khan ◽  
Jawad Sarwar ◽  
Tauseef A Khan
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Rankine Cycle ◽  
Capacity Factor ◽  
Solar Thermal ◽  
Heat Transfer Fluid ◽  
Incident Power ◽  
Steam Power ◽  
Power Cycles ◽  
Plant Configuration

This work presents the characteristics of a solar thermal tower power plant in two different places (Seville and Dubai) using three different HTFs (NaNO3-KNO3, KCl-MgCl2 and Li2CO3-Na2CO3-K2CO3) and three different power cycles (Rankine, sCO2 Recompression and sCO2 Partial cooling cycles). An indirect configuration is considered for the Gemasolar power plant. Detailed modelling is carried out for the conversion of incident power on the heliostat to the output electricity. Optimization of the cycle is carried out to determine the most promising cycle configuration for efficiency. The results showed that for the Gemasolar power plant configuration, the performance of the KCl-MgCl2 based plant was poorest amongst all. NaNO3-KNO3 based plant has shown good performance with the Rankine cycle but plant having Li2CO3-Na2CO3-K2CO3 as HTF was best for all three cycles. Partial cooling was the best performing cycle at both locations with all three HTFs. Placing the Seville Plant in Dubai has improved the efficiency from 23.56% to 24.33%, a capacity factor improvement of 21 and 52 GW additional power is generated. The optimization of the plant in Dubai has shown further improvements. The efficiency is improved, the Capacity factor is increased by 31.2 and 77.8 GW of additional electricity is produced.

Sign in / Sign up

Export Citation Format

Share Document