Method for synchronous desulfurization and denitrification of marine vessel exhaust

Abstract

The invention discloses a method for synchronous desulfurization and denitrification of marine vessel exhaust, which belongs to the field of the air pollution control and the marine vessel exhaust emission control. In the method, exhaust passes through a spray humidification and cooling zone, an ozone decomposition and free radical oxidation zone and a seawater washing zone in sequence, thereby realizing synchronous desulfurization and denitrification. The spray humidification and cooling zone which consists of a small seawater pump, an exhaust humidification and cooling pipeline and a spray nozzle can humidify and cool the exhaust; the ozone decomposition and free radical oxidation zone which consists of an ozone decomposition and free radical oxidation device, an ultraviolet lamp and an ozone generator can rapidly convert SO2 and NO into hydroxyl acid and nitric acid through hydroxyl and the like; and the seawater washing zone which consists of a seawater washing tower, a filler and a large seawater pump can convert the hydroxyl acid and the nitric acid into sulfate and nitrate and discharge the exhaust and washing water meeting standards. The synchronous desulfurization and denitrification system formed through the invention has the advantages that the size is small, no seawater quality restoration system and raw material storage and transportation are needed, the products can be directly discharged into the sea, and the like.

Description

technical field [0001] The invention relates to a method for synchronous desulfurization and denitrification of marine ship tail gas, in particular to a method for synchronous desulfurization and denitrification of marine ship tail gas, which integrates three processes of spray humidification and cooling, ozone decomposition free radical oxidation and seawater washing in series. It belongs to the field of air pollution control and ocean ship tail gas emission control. Background technique [0002] After the fuel oil in the marine diesel engine is burned at high temperature, it will not only produce nitrogen oxides (NO x ), and sulfides such as mercaptans (RSH) contained in it will be converted into sulfur oxides (SO x ), especially ocean-going ships mostly use low-quality miscellaneous oil as fuel, and the average sulfur content of marine fuel oil in the world is as high as 2.7%. Therefore, if the NO x and SO x If the concentration is not controlled, these pollutants will...

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Problems solved by technology

However, if this process is applied to desulfurization and denitrification of marine ship tail gas, there are still three problems that need to be solved: ①Bai Minyu et al pointed out that under the condition of gaseous water, the direct use of O 3 Oxidation of SO 2 The time between NO and NO takes 5s. If calculated according to the flue gas flow rate of 2.5m / s~5m / s, then O 3 The height of the oxidation tower will reach 17.5m ~ 25m, so if this process is directly transplanted to marine ship exhaust gas desulfurization, it is obvious that this O 3 The height of the oxidation tower is too large for marine ships; ②The acid mist produced by this process is collected by a collection system composed of a charging device, an alternating electric field condenser, an electric demister and its power supply, and there are also recycled products Difficult to store and transport and take up too much space and other problems caused by sea navigation; ③In this process, the method of generating gaseous water is to use external energy, so additional energy needs to be consumed

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