6 research outputs found
A Study on the Localization Algorithm Using RSSI and Directional Antennas Between Sensor Nodes for the DV-HOP Algorithm
No full text
Process design of onboard membrane carbon capture and liquefaction systems for LNG-fueled ships
No full textThis study proposes an onboard membrane carbon capture and liquefaction system for LNG-fueled ships to satisfy the IMO's 2050 greenhouse gas reduction targets. The exhaust gas from a natural gas ship has a low CO2 fraction (similar to 3%) and high O-2 fraction (similar to 16%) compared to the flue gas from power plants. Herein, considering the above distinguishing features, a membrane carbon capture and liquefaction system has been proposed that is energy efficient and compact for the application of ships. To ascertain the performance of the proposed membrane-based system, it is compared to an amine-based onboard system in terms of energy consumption and major equipment size. This work evaluates four process configurations by varying the number of membrane stages and associated liquefaction processes at different CO2/N-2 selectivity and CO2 permeance. The results show that energy consumption (3.98 GJ(e)/t(LCO2)) is higher than the amine-based system (3.07 GJ(e)/t(LCO2)) at the CO2/N-2 selectivity of 50, but it can be decreased to 3.14 and 2.82 (GJ(e)/t(LCO2)) with an improved selectivity of 100 and 150, respectively. The major equipment size decreases to 54%, 28%, and 20% of the amine-based system when the permeance is 1000, 2000, and 3000 GPU, respectively. The results indicate that the new onboard membrane carbon capture and liquefaction system can be a competitive solution for the IMO's greenhouse gas reduction targets for 2050.N
Harnessing Clean Water from Power Plant Emissions Using Membrane Condenser Technology
No full textPower
plants consume a major fraction of water to generate electricity,
typically in the range between 30–50% of all fresh water sources.
Most of the water from plants are lost with heat through stack and
cooling towers. It has been reported that if 20% of this water can
be recycled, power plants can be self-sustainable, allowing them to
be located with higher flexibility. Membrane contactor process can
be an effective solution to harness this source of water, but most
of the studies have been focused on dense vapor separation membranes
with limited success. In this work, we investigated a potential application
of membrane condenser technology to harness fresh water from power
plants. It has been shown that the membrane condenser configuration
can be 3 orders of magnitude more effective in recovering water compared
to dense vapor separation membranes, with a reasonable water/SOx selectivity of 100. We have prepared suitable
ceramic membranes as a proof-of-concept and achieved up to 85% dehumidification
efficiency in a single-pass flow. A thorough energy balance indicates
that both heat and water flux must be carefully balanced to maximize
the membrane condenser performance, and an effective module design
must be developed
