Desulfurization and denitrification integration device and method for ship diesel tail gas

Abstract

The invention discloses a desulfurization and denitrification integration device for ship diesel tail gas. The tail gas input end of a tail gas cooling device is connected to the tail gas output pipeof the diesel; the cooling tail gas output end of the tail gas cooling device is connected to a low-temperature plasma generator; the tail gas oxidation zone output end of the low-temperature plasma generator is connected to a urea washing tower; the waste liquid output end of the urea washing tower is connected with a washing waste liquid container; the first output end of the washing waste liquid container is connected with a washing waste liquid pump; the output end of the washing waste liquid pump is connected to the internal heat exchanger of the tail gas cooling device; the output end ofthe internal heat exchanger is connected to a crystallization and separation device; the output end of the crystallization and separation device is connected to the urea solution container; the second output end of the washing waste liquid container is connected to the urea solution container; the urea washing liquid output end of the urea solution container is connected to a urea pump; the output end of the urea pump is connected to the urea washing tower. The desulfurization and denitrification integration device provided by the invention has the advantages of low energy consumption, low cost, recoverable product, no secondary pollution and the like.

Description

technical field [0001] The invention relates to the technical field of marine ship tail gas emission control, in particular to an integrated device and method for desulfurization and denitrification of ship diesel engine tail gas. technical background [0002] With the rapid development of the global economy, the volume of global trade continues to grow. As one of the three major transportation systems, ocean transportation has the advantages of low transportation cost, large transportation volume, and high safety. It undertakes more than 90% of the transportation tasks in global cargo transportation. . Ocean-going ships generally use two-stroke or four-stroke diesel engines as the main propulsion device. These marine diesel engines use cheap heavy oil as fuel, which reduces shipping costs. However, the exhaust gas they emit also causes serious air pollution. Air pollutants emitted by marine diesel engines mainly include particulate matter (PM), SOx, NOx, hydrocarbons (HC) ...

AI Technical Summary

Problems solved by technology

However, there are two problems that need to be solved in this process: one is that the ozone generator has high power consumption, large volume and high price; 2 The oxidation efficiency is low, and there will be a large amount of SO in the waste liquid after seawater washing 3 2- , requires an additional water quality restoration system, and the equipment is bulky

However, there are three problems in this method: one is the corrosion problem of the exhaust pipe and plasma generator

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