Seawater electrolysis and ultraviolet radiation integrated marine exhaust multi-pollutants comprehensive treatment method and device thereof

Abstract

The invention discloses a seawater electrolysis and ultraviolet radiation integrated marine exhaust multi-pollutants comprehensive treatment method, which comprises the following steps: preparing a sodium hypochlorite solution by a diaphragm-free seawater electrolysis method, adjusting pH value of the sodium hypochlorite solution, carrying out ultraviolet radiation treatment to obtain a sodium hypochlorite solution containing strong oxidizing ROS, mixing the sodium hypochlorite solution containing strong oxidizing ROS and flue gas to be treated so as to obtain flue gas containing water-soluble high-valence acidic harmful pollutants and acid waste liquid, treating by a seawater wet processing, purifying the flue gas and directly discharging the purified flue gas into the atmosphere, and separating and purifying the waste liquid. The invention also discloses a seawater electrolysis and ultraviolet radiation integrated marine exhaust multi-pollutants comprehensive treatment device. By using seawater as a raw material, the strong oxidizing absorbent is prepared on line. Gas-liquid reaction and absorption effects are enhanced, power consumption of electrolysis is reduced, system economy is raised, and potential safety hazard of shipping business that is brought by transport and storage of chemicals is effectively avoided.

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 multi-pollutants of ship exhaust gas integrated with electrolysis of seawater and ultraviolet radiation. Background technique [0002] With the continuous growth of the global economy, the shipping industry has achieved rapid development, and the tonnage and number of ocean-going ships have also increased significantly. In order to reduce operating costs, most merchant ships use heavy residual oil in the refining process as fuel, resulting in more and more serious air pollution caused by ocean-going ships. [0003] According to the statistics in the "Clean Air Blueprint" released by the Hong Kong Environmental Protection Agency in 2013, in 2011, sulfur oxides (SOx) accounted for 54%, nitrogen oxides (NOx) accounted for 33%, and PM10 accounted for 37% of Hong Kong's marine e...

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Problems solved by technology

For this reason, in recent years, many scientific research institutes, maritime colleges and related enterprises at home and abroad have carried out a large number of studies on the comprehensive treatment of multi-pollutants in ship exhaust gas, such as: Publication No. 》, first use ozone and hydrogen peroxide to oxidize the exhaust gas of marine diesel engines, and then use sodium chloride to neutralize and absorb to realize comprehensive desulfurization and denitrification, but this method needs to store excess ozone and hydrogen peroxide solution on board, and the generated nitric acid and sulfuric acid The corrosion resistance of the equipment is high, and the initial investment and maintenance costs increase; the publication number CN104121072A "A Combined Exhaust Gas Pollutant Removal Device for Two-stroke Diesel Engines" uses wet scrubbing to remove SOx, and then partially purifies the Afterwards, the low-temperature exhaust gas is recirculated to reduce the NOx generation of the engine, but the denitrification rate of this scheme is limited, and it will lead to insufficient combustion of the engine and increased HC and CO emissions; [J].JSMEInternationalJournalSeriesBFluidsandThermalEngineering,2003,46(1):206-213.) The study proposes a comprehensive treatment process for ship exhaust gas based on ion membrane electrolysis of seawater, using the sequential process of anolyte oxidation and catholyte absorption to achieve desulfurization, denitrification, and PM removal , but this method has the problems of higher cost of ionic membrane, easy fouling and large consumption of seawater electrolyte; Publication No. CN103349907A "Flue Gas Desulfurization and Denitrification System" and Publication No. CN101053750 "A Method for Combined Desulfurization and Denitrification of Flue Gas", using The photocatalytic oxidation method efficiently oxidizes NO in flue gas, but the photocatalyst preparation process is complicated, and the surface of the catalyst is easily fouled and deactivated during the gas-solid reaction process, so the desulfurization and denitrification efficiency of the catalyst is limited

To sum up, in view of the multi-pollutant treatment of ship exhaust gas, limited by factors such as ship space and operating costs, there is currently no efficient and economical exhaust emission control technology for promotion and application.

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