Abstract
Our thermodynamic study indicated that low temperature power cycle using amine-CO2 fluid can obtain the performance equal to or higher than that of the current organic Rankine cycle. We designed a 10 kW test equipment. We set high temperature heat source is hot water at the temperature of 90°C and the flow rate of 8,200kg/h, which is a coolant from a gas engine. The heat and mass balance of the equipment was calculated thermodynamically. The result showed the power of 10.5kW and the system efficiency of 7.3 per cent at the the amine – CO2 fluid flow rate of 1,000kg/h, and the turbine expansion ratio of 4.8. The preliminary estimation shows as follows. The diameter and rotational speed of the turbine blade are 0.115m and 54,400min-1, respectively. The number, width, and length of the recuperator plates are 20, 117mm, and 835mm, respectively. The height and cross sectional area of the absorption bed are 0.35m and 0.027m2, respectively.
Highlights
IntroductionKalina cycle using NH3 and organic Rankine cycle using HFC-245fa (CHF2CH2CF3) can generate electricity from the low temperature heat
Low temperature heat below 200°C is produced massively (Shindo et al, 2008)
The thermodynamic simulation shows the maximum power of the low temperature cycle using 30 mass% methyl diethanol amine (MDEA)-H2O solution (CO2/MDEA mole ratio: 0.15) is equal to that of the Organic Rankine cycle using HFC245fa
Summary
Kalina cycle using NH3 and organic Rankine cycle using HFC-245fa (CHF2CH2CF3) can generate electricity from the low temperature heat. The former is toxic and corrosive and the latter has a high GWP value, which is required to reduce by the Kigali amendment to the Montreal Protocol and the Regulation (EU) No 517/2014. The thermodynamic simulation shows the maximum power of the low temperature cycle using 30 mass% methyl diethanol amine (MDEA)-H2O solution (CO2/MDEA mole ratio: 0.15) is equal to that of the Organic Rankine cycle using HFC245fa. This paper shows mass and heat balance, preliminary designs of a recuperator, a turbine, and an absorption bed in a 10 kW low temperature power cycle using MDEA-based solution. The pinch temperatures of Hx1, Hx2, and Hx3 are assumed to be 4°C, 5°C, and 5°C, respectively
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