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Analysis of a high-temperature heat exchanger for an externally-fired micro gas turbine
KTH, Skolan för industriell teknik och management (ITM), Energiteknik. Universidad Mayor de San Siḿona, Bolivia .
KTH, Skolan för industriell teknik och management (ITM), Energiteknik.ORCID-id: 0000-0002-4479-344X
KTH, Skolan för industriell teknik och management (ITM), Energiteknik, Tillämpad termodynamik och kylteknik.ORCID-id: 0000-0002-9902-2087
Visa övriga samt affilieringar
2015 (Engelska)Ingår i: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 75, s. 410-420Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The externally-fired gas turbine (EFGT) can convert fuels such as coal, biomass, biomass gasification gas and solar energy into electricity and heat. The combination of this technology with biomass gasification gas represents an interesting option for gasification, for which it has been difficult to find a conversion technology. In this system, the heat exchanger deals with the contaminants of biomass derived gas instead of the turbine itself. However, these contaminants can build a deposit layer in the heat exchanger that can affect its performance. The heat exchanger is important in externally fired gas turbines since the turbine inlet temperature is directly dependent on its performance. Several studies on heat exchangers for externally fired gas turbines have been carried out. However, very few detailed studies were found comparing the performance of heat exchangers for externally fired gas turbines considering the effect of deposit materials on the surfaces. In this regard, this work compares the performance of a corrugated plate heat exchanger and a two-tube-passes shell and tube heat exchanger considering the effect of thickness of deposit material with different thermal conductivities on pressure drop and effectiveness. The results show that the effectiveness of the corrugated plate heat exchanger is more influenced at larger thicknesses of deposit materials than the two-tube-passes shell and tube heat exchanger. There is an exponential increase in the pressure drop of the plate heat exchanger while a monotonic increase of pressure drop is seen for the shell and tube heat exchanger. The increase in the thickness of the deposit material has two effects. On one hand, it increases the resistance to heat transfer and on the other hand, it reduces the through flow area increasing the velocity and hence the heat transfer coefficient. Additionally, the effectiveness of the heat exchangers had a stronger influence on the power output than the pressure drop.

Ort, förlag, år, upplaga, sidor
2015. Vol. 75, s. 410-420
Nyckelord [en]
Externally fired gas turbine, Heat exchanger, Biomass gasification gas, Deposit materials, Effectiveness, Pressure drop
Nationell ämneskategori
Energiteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-159351DOI: 10.1016/j.applthermaleng.2014.10.014ISI: 000347263800041Scopus ID: 2-s2.0-84921464634OAI: oai:DiVA.org:kth-159351DiVA, id: diva2:785089
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbete
Anmärkning

QC 20150202

Tillgänglig från: 2015-02-02 Skapad: 2015-01-29 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Externally fired gas turbine cycle based on biomass gasification gas as fuel
Öppna denna publikation i ny flik eller fönster >>Externally fired gas turbine cycle based on biomass gasification gas as fuel
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Energy services are essential for the development of societies, reduce poverty, and improve the living standards of inhabitants. The conventional routes to provide energy services employ fossil fuels. However, this involves environmental and availability concerns. Environmental issues and the need for energy security demand the use of alternative energy sources. Biomass is a renewable energy source that is advantageous because of its dispatchability and local availability worldwide. Local generation at small scales is interesting because it reduces energy losses when transporting electricity and heat. The development of sustainable decentralized small scale heat and power plants (CHP) using biomass is thus important.

In this context, this work is mainly focused on the development of an energy conversion technology based on an externally fired gas turbine using biomass gasification gas as fuel. Although this system is not new, its applicability with biomass gasification gas has not been widely studied. This work is divided in three parts. In the first part, the effect of the fuel composition and fuel inlet temperature on the performance of an externally fired gas turbine prototype is analyzed through simulations. Then, the performances of two types of heat exchangers are compared under the operational conditions of the prototype taking into account different thicknesses of deposit materials. The results shows that the composition of the fuels and the corresponding flue gas temperatures affect the electrical power output of the system. However, this is limited by the operating temperature of the heat exchanger. It is also reported that a decrease in the effectiveness of the heat exchanger has a greater influence on the electrical power output than an increase in the pressure drop as a result of deposit materials. High pressure drops in the hot side of the heat exchanger slightly affect the electrical power output. If biomass gasification gas is to be used after the gasifier with reduced cleaning steps, the effect of contaminants such as tar in the combustion performance is important. The last part in this work describes experimental studies of the effect of benzene as tar representative in the combustion performance of a surrogate mixture of biomass gasification gas. Polyaromatic hydrocarbons such as benzene, present in tar in biomass derived gas, affect the combustion emissions depending on their concentration in the fuel gas.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2015. s. xxii, 122
Serie
TRITA-KRV, ISSN 1100-7990 ; 15:03
Nyckelord
Externally fired micro gas turbine, heat transfer, combustion of biomass derived gas, micro combined heat and power
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Energiteknik
Identifikatorer
urn:nbn:se:kth:diva-165166 (URN)978-91-7595-524-7 (ISBN)
Disputation
2015-05-18, F3, Lindstedsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbete
Anmärkning

QC 20150424

Tillgänglig från: 2015-04-24 Skapad: 2015-04-23 Senast uppdaterad: 2015-04-24Bibliografiskt granskad

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Malmquist, AndersPalm, Björn

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Baina, FabiolaMalmquist, AndersPalm, BjörnFransson, Torsten H.
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