Ship exhaust gas mixed type desulfurization device and working method thereof

Abstract

The invention discloses a ship exhaust gas mixed type desulfurization device and a working method thereof. The device comprises an exhaust gas power generation system, an exhaust gas desulfurization system, an exhaust gas discharging system and an automatic monitoring and controlling system; and the working method comprises the steps of exhaust gas power generation, exhaust gas desulfurization and exhaust gas discharging. Because the desulfurization device disclosed by the invention adopts organic Rankine cycle to perform power generation, so that the exhaust gas waste heat of a ship host is fully used, jacket water of the host is used as a heating source of an organic working medium, and the generated electric energy is used for the desulfurization system, so that the comprehensive utilization of the energy of a ship system is realized. Because the desulfurization device disclosed by the invention adopts the mixed type desulfurization system, when a ship navigates on the high seas, an open type seawater method is adopted for desulfurization, and when the ship navigates in a harbor, a closed NaOH solution method is adopted for desulfurization, so that the actual needs of the ship for desulfurization under different operating conditions are realized. Because the desulfurization device disclosed by the invention adopts a double-tower structure, efficient desulfurization of the ship exhaust gas is realized, and the strict requirements of all conventions on tail gas discharge after gasification are met.

Description

technical field [0001] The invention relates to the field of ship energy saving and emission reduction, in particular to a ship waste gas hybrid desulfurization device and a working method thereof. Background technique [0002] Ocean-going ships mostly use heavy oil or residual oil as fuel, and these fuels contain a large amount of sulfur, which will inevitably cause a large amount of polluting gas SOx in the exhaust gas. According to statistics, the SOx emissions caused by ships account for more than 5% of the total SOx emissions in the world, and this data is increasing year by year, seriously affecting the ecological environment and people's health. For this reason, the emission of sulfur oxides from ships is clearly regulated in Annex VI of the MARPOL Convention (International Convention for the Prevention of Pollution from Ships). At present, the global fuel oil sulfur content limit is within 3.5%. This standard came into effect on January 1, 2012. By January 1, 2020, ...

AI Technical Summary

Problems solved by technology

The former uses unpurified tail gas, which has a high content of sulfur oxides, which can easily cause corrosion problems in the heat exchanger

The latter uses the superheated steam produced by the boiler. From the perspective of ship design, its steam output cannot meet the heat required for the exhaust heating of the main engine of the ship.

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