Ship waste gas washing device

Abstract

The invention discloses a ship waste gas washing device which is composed of a washing tower, a washing liquid supply and discharge system and a ship waste gas cooling system, a ship waste gas outlet is formed in the top of the washing tower, and a spraying layer washing area, a packing layer washing area and a ship waste gas cooling area are sequentially arranged in the washing tower from top to bottom. A supply part of the washing liquid supply and discharge system provides washing liquid for the spraying layer washing area, a discharge part of the washing liquid supply and discharge system discharges washing wastewater, and the ship waste gas cooling system is provided with a ship waste gas inlet; ship waste gas introduced from the ship waste gas inlet is cooled by cooling liquid provided by the ship waste gas cooling system, enters the ship waste gas cooling area and then flows back from bottom to top; meanwhile, washing liquid provided by the supply part of the washing liquid supply and discharge system uniformly passes through the spraying layer washing area and the packing layer washing area in sequence to be in contact with ship waste gas flowing reversely from bottom to top to wash the ship waste gas, and the washed ship waste gas is discharged through a ship waste gas outlet; the invention has the advantage that low-resistance, low-consumption and high-efficiency washing can be realized.

Description

technical field [0001] The invention relates to a ship waste gas treatment technology, in particular to a ship waste gas washing device. Background technique [0002] With the continuous development of international shipping, the number of global ships is increasing year by year. Since most ships use heavy fuel oil (HFO) with high sulfur content and low cost as fuel, the exhaust gas contains a large amount of sulfur oxides (SO X ), nitrogen oxides (NOx) and particulate matter (PM), which have caused very serious pollution to the atmosphere. Therefore, the International Maritime Organization (IMO) has promulgated a global "sulfur limit order", requiring that from January 01, 2020 the global The mass fraction of sulfur in fuel oil used by ships is ≤0.5%. Choosing low-sulfur fuel oil is the simplest and most effective way to deal with the "sulfur limit order", but the price difference between high and low-sulfur fuel oil is large, and the cost of shipowners will increase grea...

AI Technical Summary

Problems solved by technology

Both have their own advantages and disadvantages. The advantage of the spray scrubber is that the smoke resistance drop is small. The disadvantage is that the liquid-gas ratio is high and the pump consumption is large, especially when the load is low. In order to ensure the spray coverage and nozzle atomization quality, The liquid-gas ratio is higher, and the pump consumption per unit of flue gas treatment capacity is greater. Second, the spray washing area takes up a lot of space, with as many as 4 to 5 spray layers, and the spray washing area is as high as 6 meters to 8 meters.

The advantages of the packed scrubber are low liquid-to-gas ratio, low pump consumption, and strong adaptability to load changes. The flow rate of the washing liquid can be reduced as the load decreases, and the pump consumption decreases with the decrease of the load. The disadvantage is that the washing liquid distributor The distribution effect of the washing liquid is poor, so that the washing liquid is unevenly distributed in the packing layer, which affects the washing effect. Second, the liquid flow or droplet distribution of the washing liquid distributor is poor, and the auxiliary washing effect is small. The third is that the packing layer is thick and requires Arranged in layers, the washing liquid collection and redistributor between layers takes up a lot of space, and the liquid distribution is uneven

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