Comprehensive treatment method and device of waste gas of ship on basis of seawater electrolysis

Abstract

The invention discloses a comprehensive treatment method of waste gas of a ship on the basis of seawater electrolysis. The comprehensive treatment method comprises the following steps: (S1) preparing a seawater solution containing higher and effective chloride concentration and mixing with acidic seawater solution; (S2) mixing high-pressure steam with the solution obtained in the step (S1) and mixing with the waste gas of the ship; (S3) carrying out wet-process spraying treatment and demisting on flue gas obtained by the step (S2), then discharging to atmosphere. The invention also discloses a comprehensive treatment device of the waste gas of the ship on the basis of seawater electrolysis. The comprehensive treatment method and device disclosed by the invention have the advantages that surplus electricity and steam resources of the ship are utilized, the potential ship-safety hazard and the additional investment cost caused by transportation and chemicals stored on the ship are reduced, the reaction time of waste gas treatment is shortened, the energy consumption such as an additional water pump needed for liquid-phase absorption is reduced, so that the operation cost of the treatment device of the waste gas of the ship is further reduced, the system economy is improved, a set of system is realized, and simultaneously, harmful components such as SOx, NOx and particulate impurities in the waste gas of the ship are removed; and the process is higher in integration level, and the device is smaller in occupied area.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of air pollution caused by ships, and in particular relates to a comprehensive treatment method and device for ship waste gas based on electrolysis of seawater. Background technique [0002] According to statistics, the volume of cargo transported by ocean-going ships accounts for more than 85% of the total global cargo volume. There are more than 50,000 ocean-going merchant ships engaged in international trade with a tonnage of more than 300 gross tonnage, most of which use diesel engines as power plants and power generation devices. Since most of the fuel oil used by ships is low-quality residual oil in the process of petroleum refining, with high sulfur content, high viscosity, and high residual carbon value, ship exhaust emissions have caused more and more serious damage to the atmospheric environment and human health. Impact. [0003] In order to reduce the air pollution caus...

AI Technical Summary

Problems solved by technology

Such as: Patent No. 201110120210.0 "Large Two-Stroke Diesel Engine with Exhaust Gas Purification System", Patent No. 201280045211.6 "Exhaust System and Selective Catalytic Reduction Method", etc., by optimizing the exhaust pipe of the cross-head large turbocharged two-stroke diesel engine In the system, SCR is installed to achieve efficient removal of nitrogen oxides in exhaust gas, but there are problems such as high denitrification investment and operating costs, excessive leakage of ammonia to the atmosphere causing pollution, narrow reaction temperature window and sulfur poisoning resistance of the catalyst; patent No. 201410146023.3 "A System for Treating Exhaust Gases from Ships" and Patent No. 201310259906.0 "A Equipment for Washing and Desulfurizing Exhaust Gases from Marine Diesel Engines" both use sodium hydroxide and hydrogen peroxide as detergents to remove pollutants in ship exhaust gases. sulfur oxides, but it needs to store a large amount of chemical substances on board, occupying the effective space of the ship, and reducing the safety of the ship

However, in terms of comprehensive waste gas treatment, there are many research reports on comprehensive flue gas treatment of land power plants and coal-fired power plants, but the relevant treatment technologies and devices are difficult to adapt to the characteristics of the offshore environment, and are difficult to meet in terms of economy and space utilization. actual ship requirements

There are few reports on the comprehensive treatment technology of ship exhaust gas, such as patent number 201310116629.8 "Nadium Alkali Chemical Absorption - Non-thermal Discharge Simultaneous Desulfurization and Denitrification System". At the same time, the purpose of desulfurization and denitrification, but this method has problems such as high plasma energy consumption, space occupied by storage of lye on board, and impact on safety; Spray oxidation with hydrogen oxide, etc., and then neutralize and absorb with sodium chloride to achieve comprehensive desulfurization and denitrification, but this method needs to consume excessive amounts of ozone and hydrogen peroxide solution, and the generated nitric acid and sulfuric acid have high requirements for equipment corrosion protection. Increased investment and maintenance costs; Patent No. 201410374452.6 "A Combined Exhaust Gas Pollutant Removal Device for Two-Stroke Diesel Engines", which uses wet scrubbing to remove SOx, and then recirculates part of the low-temperature clean exhaust gas to reduce the amount of NOx generated by the engine , but the denitrification efficiency of this scheme is limited, and it will lead to problems such as insufficient combustion of the engine, increased HC and CO emissions, etc.

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