4. liekkipäivä, tampere, 23.1 - ffrc.fi · 4. liekkipäivä, tampere, 23.1.2008 energy and...

4. Liekkipäivä, Tampere, 23.1.2008TUT: Applications of HTAC Technique in Combustion of Liquid FuelsEnergy and Process Engineering

4. Liekkipäivä, Tampere, 23.1.2008

TEKES Group Project:COMPUTATIONAL AND EXPERIMENTAL STUDY OF

COMBUSTION PROCESSES:Tampere University of Technology (TUT)Helsinki University of Technology (TKK)

VTT Technical Research Centre of Finland (VTT)

Project at TUT:Application of HTAC Technique in Combustion of Liquid Fuels

Anna Pitkänen and Antti OksanenTampere University of Technology

Matti KytöOilon Energy Oy

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AIR

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Project Main Goals

Developing a test reactor• Detailed reaction kinetics study• Help to develop better models for gas emissions

Detailed model for combustion of a liquid particle• Especially oxidation of residual char

Combustion can be ‘optimize’ better when char phenomena are better known both• In burner scale• In furnace scale

Better models for CFD computationsAIR

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2/11


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Reactor Designing

• Tests of different droplet generating methods• Reactor designing e.g.

– fixed or moving (problematic) glass in reactor for optical measurements

– burn-out will happen in very short time4 fixed windows for measurements

• Selection of fuel to be used– has to form cenospheres– Plenty of carbon and low oxygen content

Simply put, HFO or similar fuel

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3/11


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Generating Droplets, 1

Main features (Piezodropper 2004)Commercially available

o Piezodropper• Nozzle diameter: 10 – 100 µm• Droplet

– Diameter: 10 - 100 µm– Volume: 0.5 – 500 pl– Velocity: ~ 2 m/s– Rate: from single shot to 3 kHz

• Fuel viscosity: < 0.100 Pa*s = 1 Poise (d = 40 µm)

• Suitable liquids:– Water– 20 % glycerol– DMSOAIR

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4/11


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• Inkjet used in printers

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• 1. version

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2. version:• Based on Yang et al. 1997• Many similar designs after Yang et al. uses the

same basic principles• Inkjet printers use the same kind of technique,

although in smaller scale

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GND+

50 - 200 µm

Fuel inlet

Piezoceramic disc

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Generating Droplets, 4 …

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8/11


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Test Reactor, Scheme

• Uniform droplets size 100 – 200 µm, operating temperature 800 – 1000 °C• Optical concentration measurement will be used, OH-radical with LIF (TKK)

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• Cenosphere formation and oxidation are happening separately

• FTIR measurements will be used to estimate pyrolysis stage and to analyse combustion gases

• Gas composition can be changed

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Test Reactor, Structure

1.

2.

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1. Droplet Generator2. Virtual Impactor3. Optical Measurements

(windows)

• Modular design• Oxidation in air

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10/11


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Events and Future Plans

• The principal researcher in the project got new job in industry in August 2007

Minor activities at the end of 2007 Planning of functional droplets’ generator continues – new generator is completed and tests will start in the near futureProject will continue at full capacity this yearProject is late in timetable

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4. liekkipäivä, tampere, 23.1 - ffrc.fi · 4. liekkipäivä, tampere, 23.1.2008 energy and...

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