Integrated ship waste gas dedusting and denitrifying system

Abstract

The invention related to an integrated ship waste gas dedusting and denitrifying system. The integrated ship waste gas dedusting and denitrifying system comprises a deduster, a combustion chamber, a particle treatment chamber and a denitrifying reactor, wherein the ship waste gas is sent into the deduster via a gas inlet of the deduster; a dust outlet of the deduster is connected with a dust inletof the particle treatment chamber; an urea solution spray gun is arranged in the combustion chamber; a gas exhaust port of the combustion chamber is connected with a gas inlet of the particle treatment chamber; a gas exhaust port of the particle treatment chamber and a gas exhaust port of the deduster are respectively connected with a gas inlet of the denitrifying reactor; a urea solution sprayedby the urea solution spray gun is decomposed into ammonia gas by high-temperature flue gas in the combustion chamber, and the high-temperature flue gas mixed with the ammonia gas is sent into the particle treatment chamber to combust and remove the dust particles collected by the deduster; the ammonia gas is mixed with the dedusted ship waste gas, and then the mixed gas is sent into the denitrifying reactor. The integrated ship waste gas dedusting and denitrifying system has the advantages that the concentration of waste gas particles at an outlet is controlled by the deduster; the urea solution is decomposed by the high-temperature flue gas to combust and remove the dust particles collected by the deduster, so that the dedusting and denitrifying are integrated, the treatment effect is good, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of ship exhaust gas treatment, in particular to an integrated system for dust removal and denitrification of ship exhaust gas. Background technique [0002] In order to control the pollution of ship exhaust gas pollutants to the atmosphere, the International Maritime Organization (IMO) formulated the "Regulations for the Prevention of Air Pollution from Ships" (Annex VI of the MARPOL 73 / 78 Convention), which requires that the nitrogen oxides (NOx) of ship exhaust gas X ) emissions meet Tier III standards, and particulate matter (PM) emissions should be controlled. [0003] in NO X In terms of emission control, Selective Catalytic Reduction (SCR) technology is currently one of the mainstream technologies due to its high economy and practicality. The principle of SCR technology is to spray urea solution in high-temperature exhaust gas to decompose it to generate ammonia gas, using ammonia gas as the reducing...

AI Technical Summary

Problems solved by technology

However, the seawater scrubbing method will lead to a significant drop in the temperature of the exhaust gas, which cannot be used in the removal of NO X before operation, and the main purpose of the seawater scrubbing method is to remove sulfur oxides (SO X ), the removal efficiency of PM is relatively low

In addition, diesel engines using low-sulfur fuel do not need exhaust gas desulfurization, and the cost of installing a separate seawater washing system for PM removal is relatively high

[0005] To sum up, the existing denitrification and dust removal systems are independent of each other and cannot cooperate with each other to promote each other. At the same time, the dust removal system depends on the desulfurization system, and the cost of independent use is relatively high

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