Recuperator considerations for future higher efficiency microturbines

McDonald, Colin F.

doi:10.1016/s1359-4311(03)00083-8

Cited by 191 publications

(77 citation statements)

References 35 publications

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“…The actual exhaust temperature being around 170 • C, a temperature difference of 20 • C is available until the acid dew point is reached (150 • C for biomass boilers). If the regenerator efficiency is supposed equal to 87% (see [20]) a power of 150kW can be transferred to the combustion air thus increasing the boiler efficiency by another 1.3%. The boiler efficiency increase is somehow balanced with an increase fan consumption due to the increased pressure losses in the combustion air supply line and flue gas recirculation.…”

Section: Regenerative Heat Exchangermentioning

confidence: 99%

Simulation and optimization of a CHP biomass plant and district heating network

2014

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Biomass Combined Heat and Power (CHP) plants connected to district heating (DH) networks are recognized nowadays as a very good opportunity to increase the share of renewable sources into energy systems. However, as CHP plants are not optimized for electricity production, their operation is profitable only if a sufficient heat demand is available throughout the year. Most of the time, pre-feasibility studies are based on peak power demand and business plans only assume monthly or yearly consumption data. This approach usually turns out to overestimate the number of operating hours or oversize the plant capacity.This contribution presents a methodology intended to be simple and effective that provides accurate estimations of economical, environmental and energetic performances of CHP plants connected to district heating networks. A quasi-steady state simulation model of a CHP plant combined with a simulation model of the district heating network installed on the Campus of the University in Liège (Belgium) is used as an application framework to demonstrate the effectiveness of the selected approach. Based on the developed model and actual consumption data, several scenarios for energy savings are considered and ranked. The potential energy savings and resulting energy costs are estimated enabling more general conclusions to be drawn on the opportunity of using district heating networks in urban districts for Western Europe countries.

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Section: Regenerative Heat Exchangermentioning

confidence: 99%

Simulation and optimization of a CHP biomass plant and district heating network

2014

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“…However, to the authors' knowledge, the largest ceramic heat exchanger proposed so far by SchulteFischedick et al [8], weighing up to 4 t, refers to a 6 MWe plant. In a recent work, McDonald [9] examined a wide range of heat exchanger concepts and demonstrators able to fulfill some of the aforementioned requirements; its cost-effective approach recognized the potential of ceramic recuperators for microturbines. Special efforts have been made to select and develop new alloys capable of withstanding very high temperatures and pressures (see, for example, [10]).…”

Section: Advances In Mechanical Engineeringmentioning

confidence: 99%

High Temperature Gas-to-Gas Heat Exchanger Based on a Solid Intermediate Medium

Amirante

Tamburrano

2014

Advances in Mechanical Engineering

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This paper proposes the design of an innovative high temperature gas-to-gas heat exchanger based on solid particles as intermediate medium, with application in medium and large scale externally fired combined power plants fed by alternative and dirty fuels, such as biomass and coal. An optimization procedure, performed by means of a genetic algorithm combined with computational fluid dynamics (CFD) analysis, is employed for the design of the heat exchanger: the goal is the minimization of its size for an assigned heat exchanger efficiency. Two cases, corresponding to efficiencies equal to 80% and 90%, are considered. The scientific and technical difficulties for the realization of the heat exchanger are also faced up; in particular, this work focuses on the development both of a pressurization device, which is needed to move the solid particles within the heat exchanger, and of a pneumatic conveyor, which is required to deliver back the particles from the bottom to the top of the plant in order to realize a continuous operation mode. An analytical approach and a thorough experimental campaign are proposed to analyze the proposed systems and to evaluate the associated energy losses.

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“…(McDonald, 2003)), starting from maximum flow it is possible to observe an effectiveness increase (from 0.883 to 0.918) with the mass flow rate decrease, and an effectiveness maximum followed by a decrease. However, this final trend is not so relevant as in (McDonald, 2003), because machine control system does not enable to operate steadystate tests under 20 kW (under 0.47 kg/s). Further details on all the recuperator temperatures and other tests carried out on this heat exchanger, when operating with the T100 modified machine, are shown in (Ferrari et al, 2010c).…”

Section: Twc2mentioning

confidence: 99%

“…Moreover, this technology is promising from co-generative (and tri-generative) application point of view (Boyce, 2010), and is essential for advanced power plants, such as hybrid systems , humid cycles (Lindquist et al, 2002), or externally fired cycles (Traverso et al, 2006). However, if microturbine standard cycle is modified by introducing innovative components, such as fuel cells (Magistri et al, 2002, saturators (Pedemonte et al, 2007) or new concept heat exchangers (such as ceramic recuperators (McDonald, 2003)), at least two main aspects have to be considered:  avoiding dangerous conditions (e.g. : machine overspeed, surge, thermal and mechanical stress, carbon deposition);  ensuring the proper feeding conditions to both standard and additional components.…”

Section: Introductionmentioning

confidence: 99%