Sea boat smoke evacuation washing device and its washing method

Abstract

The invention relates to a sea boat smoke exhaust washing device and a washing method. The device comprises a shell, a washing layer which is arranged at the upper part in the shell, a liquid collecting pool which is arranged at the lower part in the shell, a shell internal flue gas guide-in port arranged between the washing layer and the liquid collecting pool, a washing seawater inlet which is arranged above the washing layer and the cooler of the flue gas passage which is arranged between the shell external flue gas inlet and the washing layer; the method comprises the steps such as guiding in the flue gas, cooling and injecting the washing seawater and washing, etc. The invention provides the high-effect smoke exhaust absorption washing device and method which are suitable for high smoke temperature and narrow space of the sea boat, and has the advantages of high exhaust reduction efficiency, low running energy consumption, small volume and long service life.

Description

technical field [0001] The invention relates to a sea-going ship smoke exhaust washing device and a washing method, which use seawater to wash and reduce the emission of pollutants mainly sulfur dioxide in the sea-ship ship smoke, and belong to the technical field of atmospheric environmental protection and sea-going ship smoke pollution prevention and control. Background technique [0002] Over the past 20 years, the international legislation to reduce emissions of gaseous pollutants mainly sulfur dioxide emitted by industrial facilities has been gradually tightened and improved. In recent years, the restricted objects have developed from land-based industrial facilities to sea-based ships. [0003] After the issue of reducing sulfur dioxide emissions from ships was raised globally, there was a trend of emphasizing seawater flue gas desulfurization technology. In 2007, a research report by a joint institution of four internationally renowned universities clearly stated that...

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Problems solved by technology

[0008] 2) At the same time, the scrubber uses a hollow fiber membrane contactor to realize the washing function, the pressure drop and resistance are very large, and a booster fan is added, and the energy consumption and cost of system operation are very high

The pressure loss of the bubbling washing method is the energy loss of the exhaust to overcome the liquid pressure, which basically corresponds to the liquid column pressure at the depth of the exhaust immersion in the liquid; that is to say, the better the washing effect, the greater the pressure loss and the higher the operating cost. High, the contradiction between washing effect and operating cost is basically irreconcilable

[0018] Under the condition of using seawater as the washing liquid, the technical scheme of the invention patent requires that the operating pressure loss is less than 6 inches (152 mm) of water column, and obviously the depth of the exhaust smoke immersed in the washing liquid is also less than 6 inches. With such a shallow immersion depth, Even if supplementary technical measures are taken to increase "mixing blades" to form turbulent flow and disperse air bubbles, the total liquid-gas contact area is extremely limited, and the washing and absorption rates are still very low; to significantly improve the washing effect, it is necessary to increase the immersion depth of the exhaust gas and add Large pressure loss, increased energy consumption and operating costs, the effect is obviously not good

[0019] 2) The contradiction between cooling high-temperature flue gas and low-temperature absorption of sulfur dioxide is difficult to overcome

The cooling, washing and absorption of high-temperature flue gas in this invention is mainly carried out by the same pool of water. The temperature of seawater washing will rise while cooling high-temperature flue gas, and the heated seawater is also used to wash and absorb sulfur dioxide at the same time, so that the absorption rate of sulfur dioxide cannot be increased. ; and to improve the absorption rate, only by increasing the amount of washing water can the temperature rise of washing sea water be reduced, which will lead to a substantial increase in energy consumption and operating costs, and the process will lose sight of the other.

[0021] 3) The contradiction between anti-corrosion reducing operating costs and increasing manufacturing costs is difficult to overcome

However, the heat pipe must have a complex cross-section such as a star shape to increase its heat conduction area so that more heat can be used to reheat the exhaust gas. Since the heat exchanger works in a high-temperature, high-humidity, and strong corrosive environment, the structure is complex , it needs to use a large amount of corrosion-resistant alloy materials, which will inevitably greatly increase the manufacturing cost of the device, but will lead to an increase in the overall use cost, and the result is not worth the candle

[0023] 4) The contradiction between corrosion prevention and corrosion aggravation of reheated flue gas is difficult to overcome

[0026]Obviously, in order to solve the problem of high-temperature flue gas treatment from 200°C to 490°C of sea-going ship engines, the prior art has adopted low-efficiency and high-cost methods and devices

Based on the above status quo, the long-awaited technical principle of using seawater washing to reduce ship pollution has not been able to become a practical technical solution

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