Techno-Economic Optimization of a Combined Cycle Combined Heat and Power Plant With Integrated Heat Pump and Low-Temperature Thermal Energy Storage

2020 ◽  
Author(s):  
Jose Garcia ◽  
Vincent Smet ◽  
Rafael Guedez ◽  
Alessandro Sorce
Keyword(s):  
Energy Storage ◽  
Power Plant ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Net Present Value ◽  
Heat Pumps ◽  
Combined Cycle ◽  
Electricity Production ◽  
Ambient Conditions ◽  
Market Conditions

Abstract The present study presents a techno-economic analysis of a novel power plant layout developed to increase the dispatch flexibility of a Combined Cycle Gas Turbine (CCGT) coupled to a District Heating Network (DHN). The layout includes the incorporation of high temperature heat pumps (HP) and thermal energy storage (TES). A model for optimizing the short-term dispatch strategy of such system has been developed to maximize its operational profit. The constraints and boundary conditions considered in the study include hourly demand and price of electricity and heat, ambient conditions and CO2 emission allowances. To assess the techno-economic benefit of the new layout, a year of operation was simulated for a power plant in Turin, Italy. Furthermore, different layout configurations and critical size-related parameters were considered. Finally, a sensitivity analysis was made to assess the performance under different market scenarios. The results show that it is indeed beneficial, under the assumed market conditions, to integrate a HP in a CCGT plant coupled to a DHN, and that it remains profitable to do so under a variety of market scenarios. The best results for the assumed market conditions were found when integrating a 15 MWth capacity HP in the 400 MWel CCGT-CHP. For this case study, the investment in the HP would yield a net present value (NPV) of 1.22 M€ and an internal rate of return (IRR) of 3.04% for a lifetime of 20 years. An increase was shown also in operational flexibility with 0.14% of the electricity production shifted while meeting the same heating demand. Additionally, it was found that the TES makes the system even more flexible, but does not make up for the extra investment.

scholarly journals Thermal Energy Storage For Gas Turbine Power Augmentation

2019 ◽  
Vol 3 ◽  
pp. 592-608
Author(s):  
Vasilis Gkoutzamanis ◽  
Anastasia Chatziangelidou ◽  
Theofilos Efstathiadis ◽  
Anestis Kalfas ◽  
Alberto Traverso ◽  
...  
Keyword(s):  
Energy Storage ◽  
Gas Turbine ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Combined Cycle ◽  
Inlet Temperature ◽  
Air Cooling ◽  
Ambient Conditions ◽  
Air Inlet ◽  
Conventional Cooling

This work is concerned with the investigation of thermal energy storage (TES) in relation to gas turbine inlet air cooling. The utilization of such techniques in simple gas turbine or combined cycle plants leads to improvement of flexibility and overall performance. Its scope is to review the various methods used to provide gas turbine power augmentation through inlet cooling and focus on the rising opportunities when these are combined with thermal energy storage. The results show that there is great potential in such systems due to their capability to provide intake conditioning of the gas turbine, decoupled from the ambient conditions. Moreover, latent heat TES have the strongest potential (compared to sensible heat TES) towards integrated inlet conditioning systems, making them a comparable solution to the more conventional cooling methods and uniquely suitable for energy production applications where stabilization of GT air inlet temperature is a requisite. Considering the system’s thermophysical, environmental and economic characteristics, employing TES leads to more than 10% power augmentation.

scholarly journals Flexible Electricity Dispatch of an Integrated Solar Combined Cycle through Thermal Energy Storage and Hydrogen Production

Thermo ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 106-121
Author(s):  
Miguel Ángel Reyes-Belmonte ◽  
Alejandra Ambrona-Bermúdez ◽  
Daniel Calvo-Blázquez
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Hydrogen Generation ◽  
Combined Cycle ◽  
Medium Temperature ◽  
Cost Of Electricity ◽  
Demand Curves ◽  
Hydrogen Plant ◽  
Demand Coverage

In this work, the flexible operation of an Integrated Solar Combined Cycle (ISCC) power plant has been optimized considering two different energy storage approaches. The objective of this proposal is to meet variable users’ grid demand for an extended period at the lowest cost of electricity. Medium temperature thermal energy storage (TES) and hydrogen generation configurations have been analyzed from a techno-economic point of view. Results found from annual solar plant performance indicate that molten salts storage solution is preferable based on the lower levelized cost of electricity (0.122 USD/kWh compared to 0.158 USD/kWh from the hydrogen generation case) due to the lower conversion efficiencies of hydrogen plant components. However, the hydrogen plant configuration exceeded, in terms of plant availability and grid demand coverage, as fewer design constraints resulted in a total demand coverage of 2155 h per year. It was also found that grid demand curves from industrial countries limit the deployment of medium-temperature TES systems coupled to ISCC power plants, since their typical demand curves are characterized by lower power demand around solar noon when solar radiation is higher. In such scenarios, the Brayton turbine design is constrained by noon grid demand, which limits the solar field and receiver thermal power design.

Sign in / Sign up

Export Citation Format

Share Document