Device for washing and desulfurating waste gas of marine diesel engine

Abstract

The invention aims at providing a device for washing and desulfurating the waste gas of a marine diesel engine. The device comprises an absorption tower, a fresh water tank, an NaOH solution storage box, a circulating liquid treatment box and a waste liquid treatment box, wherein the front end of an exhaust pipe of the diesel engine is communicated with the side at the lower part of an absorption tower by a waste gas inlet pipeline; the tail end of the exhaust pipe of the diesel engine is communicated with the top of the absorption tower by a waste gas outlet pipeline; the fresh water tank is communicated with the absorption tower, the waste liquid treatment box and the circulating liquid treatment box respectively; the NaOH solution storage box is communicated with the circulating liquid treatment box and the waste liquid treatment box respectively; the lower end of the absorption tower is communicated with the circulating liquid treatment box by a circulating liquid pipeline; the circulating liquid treatment box is communicated with the absorption tower respectively by a high-temperature spray pipeline and a low-temperature spray pipeline; the circulating liquid treatment box is also communicated with the waste liquid treatment box by a waste liquid discharge pipeline; the waste liquid treatment box is communicated with an oil stain storage box, a waste liquid storage box and an outside environment respectively; the waste liquid treatment box and the waste liquid storage box are respectively communicated with the waste liquid discharge pipeline. The device is in accordance with the new standard of marine oil sulfur content required by international maritime organization (IMO).

Description

technical field [0001] The invention relates to exhaust gas washing and desulfurization equipment, in particular to ship exhaust gas washing and desulfurization equipment. Background technique [0002] With the development of the international shipping industry and ocean-going shipping, exhaust emissions from ships have become the main source of air pollution in coastal areas, especially in ports. The fuel used in marine power plants is heavy oil with high viscosity, high sulfur content, and high carbon residue. Among the gaseous emissions produced by it, SOx occupies a large proportion, and it is easy to combine with water in the air to form acid rain and acid rain. Fog and chemical smog are one of the main acid gases that cause air pollution, causing great harm to the ecological environment of the earth and human health. [0003] In 2008, in order to further limit ship exhaust pollution, the 58th IMO Marine Environment Protection Committee (MEPC) approved the amendment to...

AI Technical Summary

Problems solved by technology

This technology has the following problems: the scrubber uses a hollow fiber membrane contactor to realize the scrubbing function, and the pressure drop and resistance are very large. The addition of a booster fan increases the investment and operating costs of the system, and this method uses seawater to desulfurize the exhaust gas. The sea water is also a kind of pollution to the marine environment

[0008] 2. Chinese patent 200810048002, titled "Sea-sea ship exhaust gas desulfurization method and device", uses a packing scrubber to desulfurize the exhaust gas of sea-going ship engines, which has the problems of large washing diameter, large equipment space, and high cost; In terms of water treatment, only a separation device is added before the water-saving acid remover, which fails to achieve a good removal effect on the absorption of heavy metal ions and oil in the waste liquid

[0009] 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 exhaust gas are undertaken by the same water body 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 exhaust gas and low-temperature absorption of sulfur dioxide

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