• Resources Recycling
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• v.31 no.6
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• pp.3-17
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• 2022

The cement industry, which is an energy-intensive and high carbon dioxide emission industry, requires strategy for carbon neutrality and sustainable development. Most domestic cement companies are generating electricity by waste heat recovery system to improve energy efficiency during cement processes; however, few studies exist on recycling of energy related to this. Certain countries with high cement production researched on modifying the conventional waste heat recovery system to maximize waste heat recovery using various methods such as applying the Rankine cycle depending on the temperature, comparing working fluids, applying two or more Rankine cycles, and combining with other industries. In this study, we reviewed the research direction for energy efficiency improvement by summarizing waste heat recovery and utilization methods in the domestic and overseas cement industries.

• Journal of Internet of Things and Convergence
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• v.10 no.5
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• pp.207-212
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• 2024

Conventional marine heat exchangers have a monotonous flow path of marine engine fuel, so the contact time of the heating medium with the heat exchange tube is very short, resulting in low heating efficiency. Since it is made in a tubular shape, it is made in a very large volume regardless of the heating efficiency, so it is necessary to secure the installation space of the heating device, as well as it is difficult to install or remove it. Since the plate heat exchanger for ships to be developed in this study directly heats the marine fuel, the temperature detection sensor of the electric heater block was configured to prevent excessive temperature rise. If the detected temperature is higher than the set temperature value, a power cut-off system is configured to cut off the authorized power to the heater block. In addition, 10 tons of marine engine fuel can be heated per hour through the heater of the plate heat exchanger, and the maximum temperature can be set to 150℃. In this study, we designed and manufactured a heat exchanger for ships, and conducted basic performance experiments on the performance factors such as capacity, temperature, and pressure, and real-time information