Desulfurization, denitrification and decarbonization integrated system for ship waste gas

Abstract

The invention discloses a desulfurization, denitrification and decarbonization integrated system for ship waste gas. The desulfurization, denitrification and decarbonization integrated system comprises a diesel engine, a heat exchanger, a desulfurization washing tower, a carbon dioxide film separator, a carbon dioxide storage tank and a gas inlet valve group, wherein a waste gas circulating pipeline is arranged between a gas exhaust end and a gas inlet end of the diesel engine; the heat exchanger, the desulfurization washing tower, the carbon dioxide film separator, the carbon dioxide storage tank and the gas inlet valve group are sequentially arranged in the waste gas circulating pipeline; waste gas exhausted from the gas exhaust end of the diesel engine enters the desulfurization washing tower to subject to desulfurization to obtain desulfurization waste gas after being cooled by the heat exchanger; the desulfurization waste gas enters the carbon dioxide film separator; carbon dioxide separated out by the carbon dioxide film separator is stored in the carbon dioxide storage tank; and carbon dioxide in the carbon dioxide storage tank is conveyed to the gas inlet end of the diesel engine through the gas inlet valve group. The desulfurization, denitrification and decarbonization integrated system for ship waste gas disclosed by the invention can simultaneously reduce discharge of NOX, SOX and CO2, and realizes integration of ship equipment.

Description

technical field [0001] The invention relates to the field of ship equipment, in particular to an integrated system for desulfurization, denitrification and decarbonization of ship exhaust gas. Background technique [0002] For the control of NOx in ships X , Sulfur oxide SO X and carbon dioxide CO 2 The International Maritime Organization (IMO) has formulated the "MARPOL 73 / 78 Convention" Annex VI "Regulations on the Prevention of Air Pollution from Ships" and "Ship Energy Efficiency Index (EEDI)", which clearly stipulates that NO X , SO X Emission limits, CO 2 reduction and implementation timetable. [0003] in NO X In terms of emissions control, Exhaust Gas Recirculation (EGR) is an in-engine NO X Control technology, which can make the exhaust gas of the two-stroke low-speed diesel engine (main engine) meet the Tier III emission standard. In this technology, the partially combusted exhaust gas (≤40%) is re-mixed into the combustible intake air after cooling, due to ...

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Problems solved by technology

However, reducing ship speed and power limits the ship's ability to handle dangerous situations in harsh environments, sail back to safe ports, and avoid pirate attacks, and the amount of ship capacity that can be increased is limited for any ship design

[0006] From the above, it can be seen that the current emission reduction equipment on ships is often self-contained, and there are often gaps between the emission reduction equipment and between the emission reduction equipment and the original equipment of the ship. Due to the duplication of functions, not only the effect of controlling NOX, SOX emissions and CO2 reduction is limited, but also the equipment occupies a large area , complex problems

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