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Post-treatment method for ship tail gases

A technology for ship exhaust and exhaust gas, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as low solubility, large amount of solution used, and incomplete exhaust gas blowing, so as to improve absorption rate and removal effect , The effect of simplifying the waste gas treatment process

Inactive Publication Date: 2019-06-11
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using the absorption method to treat ship exhaust gas, because the solubility of SO and NO contained in the exhaust gas is small, it is difficult to absorb, and the harm is higher than that of SO 2 , NO 2 Larger, it is easy to cause the phenomenon that the exhaust gas is not blown completely, and the absorption type is used to absorb sulfur oxides and nitrogen oxides separately, and the amount of solution used is large, which is not conducive to energy saving and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A post-processing method for ship exhaust gas, the specific operation steps are as follows:

[0019] S1: Cooling, the exhaust gas of the internal combustion engine of the ship passes through the heat exchange coil and passes through the water tank equipped with circulating sea water to cool down the exhaust gas, and a filter is installed at the gas outlet end of the heat exchange coil to prevent the carbon black impurities in the exhaust gas. filter;

[0020] S2: Exhaust gas oxidation, mixing exhaust gas with water vapor and air, and then passing it into an oxidation chamber equipped with an ultraviolet light-emitting tube for oxidation treatment. This band of ultraviolet rays produces a large number of hydroxyl radicals when irradiated by water vapor and oxygen, which has a strong oxidation effect. Potential, can oxidize SO and NO produced by incomplete combustion into SO 2 , NO 2 , which is conducive to the absorption of the solution;

[0021] S3: Absorption of nit...

Embodiment 2

[0028] A post-processing method for ship exhaust gas, the specific operation steps are as follows:

[0029] S1: Cooling, the exhaust gas of the internal combustion engine of the ship passes through the heat exchange coil and passes through the water tank equipped with circulating sea water to cool down the exhaust gas, and a filter is installed at the gas outlet end of the heat exchange coil to prevent the carbon black impurities in the exhaust gas. filter;

[0030] S2: Exhaust gas oxidation, mixing exhaust gas with water vapor and air, and then passing it into an oxidation chamber equipped with an ultraviolet light-emitting tube for oxidation treatment. This band of ultraviolet rays produces a large number of hydroxyl radicals when irradiated by water vapor and oxygen, which has a strong oxidation effect. Potential, can oxidize SO and NO produced by incomplete combustion into SO 2 , NO 2 , which is conducive to the absorption of the solution;

[0031] S3: Absorption of nit...

Embodiment 3

[0038] A post-processing method for ship exhaust gas, the specific operation steps are as follows:

[0039] S1: Cooling, the exhaust gas of the internal combustion engine of the ship passes through the heat exchange coil and passes through the water tank equipped with circulating sea water to cool down the exhaust gas, and a filter is installed at the gas outlet end of the heat exchange coil to prevent the carbon black impurities in the exhaust gas. filter;

[0040] S2: Exhaust gas oxidation, mixing exhaust gas with water vapor and air, and then passing it into an oxidation chamber equipped with an ultraviolet light-emitting tube for oxidation treatment. This band of ultraviolet rays produces a large number of hydroxyl radicals when irradiated by water vapor and oxygen, which has a strong oxidation effect. Potential, can oxidize SO and NO produced by incomplete combustion into SO 2 , NO 2 , which is conducive to the absorption of the solution;

[0041] S3: Absorption of nit...

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PUM

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Abstract

The invention discloses a post-treatment method for ship tail gases. The method comprises the following specific operation steps: step 1, performing cooling; step 2, performing oxidation on the wastegases; step 3, absorbing nitrogen and sulfur oxides; and step 4, performing tail-gas emission. According to the method provided by the invention, concentrated oxidation is performed on the tail gasesin advance, irradiation is performed on water vapor and oxygen by using ultraviolet rays of 253.7 nm to generate a large amount of hydroxyl free radicals, and the hydroxyl free radicals have a strongoxidation electrical potential to oxidize insoluble SO and NO into easily-soluble SO2 and NO2, and facilitate improving an absorption rate of the solution; concentrated absorption is performed by adopting a spray liquid, the absorbed waste-gas is treated again by photocatalysis, so that residual NO is thoroughly degraded, and the removing effect of nitrogen oxides is further improved; and the method simplifies the waste-gas treatment process, reduces the usage amounts of the spray liquid and an absorption liquid while improving the absorption efficiency, and is energy-saving and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and more specifically relates to a post-treatment method for ship tail gas. Background technique [0002] Existing ships are mostly driven by internal combustion engines. Affected by the quality of internal combustion engine dyes, the exhaust gas of internal combustion engines will carry a large amount of nitrogen and sulfur oxides when discharged, including nitrogen monoxide, sulfur monoxide, nitrogen dioxide and sulfur dioxide. The air environment has caused serious damage, and the existing ship internal combustion engine exhaust blowing is usually treated by adsorption method. [0003] When using the absorption method to treat ship exhaust gas, because the solubility of SO and NO contained in the exhaust gas is small, it is difficult to absorb, and the harm is higher than that of SO 2 , NO 2 Larger, it is easy to cause the phenomenon that the exhaust gas is not completely blown, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/86B01D53/56B01D53/50B01D46/00
Inventor 张敏雷林聂剑宁刘顺强孙勇敢
Owner CHONGQING JIAOTONG UNIVERSITY
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