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Scientific Advances and Challenges in Ship Waste Heat Utilization

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Dr. Jingming Dong

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College of Marine Engineering, Dalian Maritime University, Dalian 116016, China
Interests: waste heat utilization; organic Rankine cycle; thermoelectric generator; waste heat refrigeration

Special Issue Information

Dear Colleagues,

Marine transportation plays a very important role in the trade transportation of all countries. According to statistics, the cargo carried by ships accounts for more than 80 percent of the global trade volume. However, ships that consume fossil fuels emit large quantities of greenhouse gases. The main fuel-consuming devices are the main engine, auxiliary engine and auxiliary boiler. Among them, the consumption of the main engine is the largest, accounting for about 70%~90%. According to literature statistics, the comprehensive energy utilization rate of modern marine diesel engines can only reach half of the energy, and the other half of the energy is discharged into the external environment in different forms of waste heat. Finding ways to harness this energy could greatly improve ship efficiency and reduce greenhouse gas emissions. Ship waste heat utilization technology covers many interdisciplinary disciplines, such as engineering thermophysics, materials, chemistry, etc., and requires in-depth academic and technical exchanges between experts and scholars in different fields. Therefore, Applied Sciences plans to organize this Special Issue entitled "Scientific Advances and Challenges in Ship Waste Heat Utilization" to explore the scientific frontier and ongoing challenges of ships’ waste heat utilization. The key topics of interest include (but are not limited to):

Ship waste heat utilization;
Ship waste heat power generation;
Ship waste heat refrigeration;
Ship waste heat heating;
Ship waste heat desalination;
Ship waste heat storage;
Ship waste heat deep utilization;
Ship waste heat utilization at ultra-low temperatures.

Dr. Jingming Dong
Guest Editor

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Research

13 pages, 6361 KiB

Open AccessArticle

Numerical Investigation on the Effect of Wet Steam and Ideal Gas Models for Steam Ejector Driven by Ship Waste Heat

by Nan He, Xiaolong Chi, Chi Feng, Manfei Lu, Li Zhang and Jingming Dong

Appl. Sci. 2023, 13(22), 12516; https://doi.org/10.3390/app132212516 - 20 Nov 2023

Viewed by 1078

Abstract

Steam ejectors could improve the energy efficiency of ships by efficiently utilizing low-grade waste heat from ships for seawater desalination or cooling. The internal flow characteristics of steam ejectors can be deeply analyzed through numerical simulation, which is of great significance for improving their performance. Due to the influence of the nonequilibrium phase change, the results of the wet steam model and the ideal gas model are significantly different. In this paper, the flow field characteristics of the wet steam model and the ideal gas model under different primary flow pressures (P_m) are compared and analyzed. The results show that the structures of the shock wave train for the wet steam model and the ideal gas model are different under different P_m. When the first shock wave of the shock wave train changes from a compression shock wave to an expansion shock wave, the P_m for the ideal gas model is 75,000 Pa and that for the wet steam model is 55,000 Pa. The phase change reduces the energy loss of the shock wave. With the increase in the P_m, the variation in the length of the shock wave train for the wet steam model decreases by 61%, the variation of the primary temperature at the nozzle exit increases by 60% and the variation in the choke temperature decreases by 50% compared with the ideal gas model. The investigation in this paper provides guidance for the design theory of a ship waste heat steam ejector. Full article

(This article belongs to the Special Issue Scientific Advances and Challenges in Ship Waste Heat Utilization)

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13 pages, 2189 KiB

Open AccessArticle

Research on the Operational Performance of Organic Rankine Cycle System for Waste Heat Recovery from Large Ship Main Engine

by Wu Chen, Binchun Fu, Jingbin Zeng and Wenhua Luo

Appl. Sci. 2023, 13(14), 8543; https://doi.org/10.3390/app13148543 - 24 Jul 2023

Cited by 6 | Viewed by 1281

Abstract

Based on the analysis of the waste heat distribution characteristics of a typical ship two-stroke low-speed main engine (model: MAN 8S65ME-C8.6HL, the specified maximum continuous rating SMCR: 21,840 kW) under different loads, two different types of organic Rankine cycle (ORC) systems, namely the basic system (BORC) and the preheated system(PORC), were constructed to recover the ship main engine’s exhaust gas waste heat and jacket cooling water waste heat. Using the thermodynamic simulation model of the system, the main performance indexes, including net output power of the two ORC systems were studied with the variation of seawater temperature and main engine load, and the annual ship fuel saving and annual carbon emission reduction generated by the two systems were compared and analyzed. It was found that the maximum net output power of the BORC system and PORC system were 445.3 kW and 491.3 kW, respectively, when the ship’s main engine load was 100%, and the outboard seawater temperature was 20 °C; the maximum thermal efficiency was 12.84% and 12.71%, respectively; under the annual operation, the fuel saving of BORC system and PORC system can be 456 tons and 510 tons, respectively, and the carbon emission reduction was 1416 tons and 1581 tons, respectively. The analysis found that the net output power of the PORC system is always greater than that of the BORC system. When the outboard seawater is lower, and the main engine load is more than 80%, the net output power difference between the PORC system and BORC system gradually expands, and the improvement of ORC system performance is more evident by adding a preheater. It can be concluded that when the ship was mainly operated in the sea area with low seawater temperature and the main engine was running under high load most of the time, selecting the PORC system to recover the waste heat of the main engine was more advantageous. Full article

(This article belongs to the Special Issue Scientific Advances and Challenges in Ship Waste Heat Utilization)

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