Method and device for desulfurizing tail gas of ship engine by electrolytic method by using sea water

A technology of tail gas treatment and electrolysis, which is applied in the field of ships, can solve the problems of limited ship space, relatively strict installation size requirements for desulfurization equipment, and affect the application of seawater desulfurization, and achieve the effect of reducing the occupied area, reducing the volume, and changing the balance of dissolution

Active Publication Date: 2012-10-03
SUNRUI MARINE ENVIRONMENT ENG
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Problems solved by technology

If it is installed on land, the area occupied by the equipment has little effect on the technology selection, but due to the limited space on the ship, the ins...

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  • Method and device for desulfurizing tail gas of ship engine by electrolytic method by using sea water

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Effect test

Embodiment 1

[0040] SO in flue gas 2 The concentration is 4900 mg / m 3 , the temperature of entering the tower is 40°C; the concentration of NaClO produced by electrolysis of natural seawater is 6 mg / L, and the liquid-gas ratio is 2.5 L / m 3 , its desulfurization efficiency was 94%.

Embodiment 2

[0042] SO in flue gas 2 The concentration is 2300 mg / m 3 , the temperature entering the tower is 75°C; the concentration of NaClO produced by electrolysis of natural seawater is 10 mg / L, and the liquid-gas ratio is 4.4 L / m 3 , the desulfurization efficiency is 91%.

Embodiment 3

[0044] SO in flue gas 2 The concentration is 1300 mg / m 3 , the inlet temperature is 95°C; the concentration of NaClO produced by electrolysis of brine with a salinity of 35PSU is 15 mg / L, and the liquid-gas ratio is 6.1 L / m 3 , its desulfurization efficiency was 96%.

[0045] The invention uses the sodium hypochlorite solution produced by electrolyzing seawater to replace the original natural seawater as the adsorbent. Sodium hypochlorite solution oxidizes sulfite dissolved in seawater to sulfate, which changes the dissolution balance between sulfur dioxide and seawater, and improves the absorption speed of seawater to sulfur dioxide. This method not only saves the aeration tank in the original seawater desulfurization process, but also improves the SO concentration per unit volume of seawater. 2 The absorption efficiency greatly reduces the volume of the absorption tower and realizes the application of seawater desulfurization technology in ships. The main reaction formul...

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Abstract

The invention discloses a method and a device for desulfurizing the tail gas of a ship engine by an electrolytic method by using sea water. The method comprises the following steps of: feeding ship fume from which dust is removed into a first channel of a gas-to-gas heat exchanger, reducing temperature, and allowing the ship fume to flow through an absorption tower; performing electrolysis on natural sea water by using electrolysis chlorine producing equipment to produce a sodium hypochlorite sea water solution; pumping the sodium hypochlorite sea water solution into the absorption tower by a spraying pump in a certain liquid-gas ratio, forming fog drops in the tower, and allowing the fog drops to flow in a direction which is reverse to that of the fume to remove SO2; and discharging the desulfurized fume by a second channel of the gas-to-gas heat exchanger and a chimney. According to the method for desulfurizing the tail gas, the sodium hypochlorite sea water solution produced by the performing electrolysis on the sea water is used as adsorbent and replaces the original natural sea water. The sodium hypochlorite sea water solution oxidizes the sulfite ions dissolved in the sea water into sulfate radicals, so that the speed of absorbing sulfur dioxide by the sea water is improved. An aeration basin in the prior art is eliminated, the SO2 absorption rate of each unit of the sea water is improved simultaneously, the size of the absorption tower is greatly reduced, and a sea water desulfurizing process is applied to a ship.

Description

technical field [0001] The invention relates to a ship tail gas treatment device and process, belonging to the ship field. Background technique [0002] SO X (including SO 2 and SO 3 ) will cause damage to the ecological environment and severe acid rain. In the exhaust of marine gas turbines, SO 2 and SO 3 The contents are 95% and 5%, respectively, all of which come from the combustion of sulfur in fossil fuels. Since the fuel used for marine gas turbines is mostly residual oil, the sulfur content is generally above 4.5%, which further increases the air pollution caused by ships during navigation. With the increasing number of ships in the commercial fleet, the control of SOx emissions by the International Maritime Organization has become increasingly stringent. According to the MARPOL Convention, for SO X The main measure of emission control is to control the sulfur content of marine fuel oil, and the SOx exhaust gas cleaning system (after-treatment device) can also...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 高健刘光洲
Owner SUNRUI MARINE ENVIRONMENT ENG
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