Device and method for performing alkali desulfurization and dust removal on ship exhaust fume

Abstract

The invention discloses a device and a method for performing alkali desulfurization and dust removal on ship exhaust fume, which relate to the technical field of atmospheric environment protection. The device comprises an engine / burning boiler on a ship and is characterized in that: exhausted gas of the engine / burning boiler is connected to a washing tower through a gas duct; a spraying layer connected with an alkaline liquor supplying pipe is arranged in the washing tower; a fresh water supplementing unit is connected to the lower part of the washing tower through a pipeline; an outlet at the bottom of the washing tower is connected to the alkaline liquor supplying pipe through a buffering box, a pump and a heat exchanger sequentially; an outlet of the heat exchanger is also connected with an inlet of a separator; two outlets of the separator are respectively connected with a discharge pipe and a sludge tank; and an alkaline liquor supplementing unit is connected with the alkaline liquor supplying pipe. When the device and the method are compared with the prior art, under the condition of relatively small amount of used water, very high desulfurization efficiency can be met, the device and the method have the characteristics of small occupied space and low cost, and can be applied to desulfurization of ships or burning boilers navigating in different sea areas and pollutant control regions.

Description

technical field [0001] The invention relates to the technical field of atmospheric environment protection, in particular to a device and a method for carrying out alkaline desulfurization of smoke exhaust from ships. Background technique [0002] With the implementation of the 73 / 78 Annex VI of the International Maritime Organization, the reduction of sulfur dioxide emission from ships has been paid more and more attention by more and more countries. In the global shipping industry, there are a large number of ships using low-quality oil engines or oil-fired boilers. If the standard of low-sulfur fuel oil is used, it will lead to a substantial increase in the economic cost of the shipping industry. The use of flue gas purification technology is the premise of ensuring sulfur dioxide emissions. , making the cost increase smaller. [0003] In the prior art, the main technologies for removing ship flue gas pollutants are: [0004] 1. The Chinese patent application number is 2...

AI Technical Summary

Problems solved by technology

This technology has the following problems: the scrubber uses a hollow fiber membrane contactor to realize the washing function, the pressure drop and resistance are very large, and the addition of a booster fan increases the investment and operating costs of the system

[0006] 3. The Ecosilencer seawater washing device invented by MES company, its core component scrubber adopts US Patent No. US7056367, the name is "Method and device for washing gas by mixing blades", the scrubber adopts "exhaust gas is passed into the washing liquid of the pool" that is In the bubbling washing method, the cooling and washing absorption of high-temperature flue gas are undertaken by the same pool of water at the same time, and the mass transfer efficiency is low. To improve the absorption efficiency, the amount of washing water and pressure loss must be increased, which will lead to increased energy consumption and operating costs. And there is a contradiction between cooling high-temperature flue gas and absorbing sulfur dioxide at low temperature

[0007] 4. Chinese patent 200810048002, titled "Sea-sea ship exhaust gas desulfurization method and device", uses a packing type scrubber to desulfurize the flue gas of sea-going ship engines, which has problems such as large diameter of the scrubber, large equipment occupation space, and high cost

[0008] 5. Marine diesel engine giant The company's lye washing technology has a large volume and a lot of equipment, and the cost of new construction and renovation is very high

[0012] (2) The device occupies a large space, and it is difficult to modify existing ships

[0013] (3) It cannot meet the various environmental conditions of the ship in different sea areas and different pollutant control areas

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