Industrial waste heat resources

Redko, Andriy; Redko, Oleksandr; DiPippo, Ronald

doi:10.1016/b978-0-12-816249-1.00009-1

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…Two heat exchangers employed for cogenerative purpose are present into the plant, named "COOL HX1" and "COOL HX2", recovering heat respectively from the CO2 cooling heat exchanger and from the exhaust gas, downstream of the GAS HX, to supply thermal power to the thermal user hot water circuit. The ORC subcritical recuperated architecture, represented in Figure 3b, is chosen as comparative bottoming system according to the current state of the art of waste heat recovery applications [8]. In this cycle, an organic fluid circulates through the plant being evaporated and superheated into the heat recovery heat exchanger ("GAS HX"), expanded into the turbine, condensed (into the "COOL HX"), and pressurized by means of a pump.…”

Section: Plant Architecturementioning

confidence: 99%

“…The ORC subcritical recuperated architecture, represented in Figure 3b, is chosen as comparative bottoming system according to the current state of the art of waste heat recovery applications [8]. In this cycle, an organic fluid circulates through the plant being evaporated and superheated into the heat recovery heat exchanger ("GAS HX"), expanded into the turbine, condensed (into the "COOL HX"), and pressurized by means of a pump.…”

Section: Plant Architecturementioning

confidence: 99%

“…More appropriate alternatives might consist in more flexible bottoming cycles, which allow simpler generation of the vapor, thanks to lower critical temperatures of the working fluid. Suitable solutions for the considered operating range are identified in the Organic Rankine Cycle (ORC) and the innovative CO2 Brayton cycle, or supercritical CO2 cycle (s-CO2) [8]; Figure 2 compares the different operating range of heat to power conversion technologies based on bottoming thermodynamic cycles for WHR applications. This wasted energy could be profitably used as a secondary thermal resource in order to increase the efficiency of fuel usage and to mitigate environmental drawbacks.…”

Section: Introductionmentioning

confidence: 99%

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Systematic Comparison of ORC and s-CO2 Combined Heat and Power Plants for Energy Harvesting in Industrial Gas Turbines

et al. 2021

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Gas turbine power plants are widely employed with constrained efficiency in the industrial field, where they often work under variable load conditions caused by variations in demand, leading to fluctuating exhaust gas temperatures. Suitable energy harvesting solutions can be identified in bottoming cycles, such as the conventional Organic Rankine Cycles (ORC) or the innovative supercritical CO2 (s-CO2) systems. This paper presents a detailed comparison of the potential of ORC and s-CO2 as bottomers of industrial gas turbines in a Combined Heat and Power (CHP) configuration. Different gas turbine models, covering the typical industrial size range, are taken into account and both full- and part-load operations are considered. Performance, component dimensions, and operating costs are investigated, considering ORC and s-CO2 systems specifics in line with the current state-of-the-art products, experience, and technological limits. Results of the study show that the s-CO2 could be more appropriate for CHP applications. Both the electric and thermal efficiency of s-CO2 bottoming cycle show higher values compared with ORC, also due to the fact that in the examined s-CO2 solution, the cycle pressure ratio is not affected by the thermal user temperature. At part-load operation, the gas turbine regulation strategy affects the energy harvesting performance in a CHP arrangement. The estimated total plant investment cost results to be higher for the s-CO2, caused by the higher size of the heat recovery heat exchanger but also by the high specific investment cost still associated to this component. This point seems to make the s-CO2 not profitable as the ORC solution for industrial gas turbine heat recovery applications. Nevertheless, a crucial parameter determining the feasibility of the investment is the prospective carbon tax application.

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Section: Plant Architecturementioning

confidence: 99%

Section: Plant Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Systematic Comparison of ORC and s-CO2 Combined Heat and Power Plants for Energy Harvesting in Industrial Gas Turbines

et al. 2021

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“…Gas turbines are used for many applications such as aircraft and ship propulsion, and power generation [1]. The use of the gas turbine is distinguished by the output power.…”

Section: Introductionmentioning

confidence: 99%

Test-Rig Simulation on Hybrid Thermal Barrier Coating Assisted with Cooling Air System for Advanced Gas Turbine under Prolonged Exposures—A Review

et al. 2021

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Thermal barrier coating (TBC) and cooling air systems are among the technologies that have been introduced and applied in pursuing the extensive development of advanced gas turbine. TBC is used to protect the gas turbine components from the higher operating temperature of advanced gas turbine, whereas cooling air systems are applied to assist TBC in lowering the temperature exposure of protected surfaces. Generally, a gas turbine operates in three main operational modes, which are base load, peak load, and part peak load. TBC performance under these three operational modes has become essential to be studied, as it will provide the gas turbine owners not only with the behaviors and damage mechanism of TBC but also a TBC life prediction in a particular operating condition. For TBC under base load or so called steady-state condition, a number of studies have been reviewed and discussed. However, it has been found that most of the studies have been conducted without the assistance of a cooling air system, which does not simulate the TBC in advanced gas turbine completely. From this review, the studies on TBC-assisted cooling air system to simulate the advanced gas turbine operating conditions have also been summarized, which are limited to test rig simulations under thermal cyclic mode where thermal cyclic represents peak and part peak load conditions. The equipment used to simulate the gas turbine operating condition, test temperatures, and durations are parameters that have been taken into consideration under this review. Finally, a test rig that is capable of simulating both TBC and cooling air effects at a high operating temperature of advanced gas turbines for prolonged exposure under steady-state condition has been proposed to be developed.

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