Method for integrated desulfurization and denitration for marine ship exhaust

Abstract

The invention discloses a method for integrated desulfurization and denitration for marine ship exhaust, and belongs to the fields of air pollution control and marine ship exhaust control. The exhaust passes through an atomizing humidification and cooling area, a discharging oxidation area and a seawater washing area in turn to complete the integrated desulfurization and denitration. The exhaust is humidified and cooled by the atomizing humidification and cooling area consisting of a small seawater pump, an exhaust humidifying and cooling pipe and a nozzle; SO2 and NO are converted into sulfuric acid and nitric acid by massive HO2, OH and other oxidative free radicals in the charging oxidation area consisting of a plasma generator; and the sulfuric acid and nitric acid are converted into sulfate and nitrate by the seawater washing area consisting of a seawater washing tower, a filler and a large seawater pump, and the exhaust meeting the standard and washing water are discharged. The integrated desulfurization and denitration system has the advantages of low energy consumption, small volume, low price, no need of a seawater quality restoring system or raw material storage and transportation, direct discharge of products into sea and the like.

Description

technical field [0001] The invention relates to a method for integrated desulfurization and denitrification of marine ship tail gas, in particular to a method for integrated desulfurization and denitrification of marine ship tail gas that integrates the three processes of spray humidification cooling, discharge oxidation and seawater washing in series, and belongs to The field of air pollution control and marine ship exhaust emission control. Background technique [0002] For marine marine diesel engine exhaust NO x and SO x At present, there are mainly SCR method and seawater washing method for the two kinds of pollutants, but neither of these two methods can efficiently remove NO x and SO x , so that it is difficult to completely use one of the methods to make the exhaust gas of the ship meet the NO x and SO x Therefore, it is necessary to use two systems on the ship to desulfurize and denitrify separately, which will inevitably greatly increase the cost of desulfuriz...

AI Technical Summary

Problems solved by technology

[0004] However, there are still two problems that need to be solved in this ozone oxidation combined with seawater washing process: ① the ozone generator required by this process has too much power consumption, is bulky and expensive

Taking a 3000kW marine diesel engine as an example, if the NO emission in the exhaust gas is 11g / (kW.h), then according to O 3 According to the principle of mole number: NO mole number=1:1, the output of the ozone generator required to oxidize NO should be calculated to be 52.8kg / h, and the power of the large-scale oxygen source ozone generator with an ozone output of 50kg / h is 400kW, external dimensions are 4900mm×4000mm×3000mm, and the price exceeds 4 million. It can be seen that if this process is adopted, the power consumption of the oxygen source ozone generator alone accounts for 13.33% of the power of the diesel engine. If the air source ozone generator is used, its Power consumption will be doubled, and it can also be seen that this ozone generator is bulky and expensive

②This process also needs to add a seawater quality recovery system for washing waste seawater, which will not only consume a large amount of additional electric energy, but also prolong the entire tail gas desulfurization process

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