Large diesel engine tail gas circulation treatment system and method

Abstract

The invention discloses a large diesel engine tail gas circulation treatment system and method. The system comprises an air cylinder, an air inflow system composed of a pure oxygen source and an inert gas source and an EGR system. The EGR system comprises a turbocharger, an intercooler, a scrubber, a gas-water separator and an EGR draught fan. The air inflow system and pure oxygen and inert gas of the EGR system are connected to the air inflow end of the air cylinder through valves in parallel. An air cylinder bypass device is connected to a pipeline between the turbocharger and the intercooler. By the adoption of the large diesel engine tail gas circulation treatment system, pure oxygen and inert gas are used for replacing original air, the oxygen concentration is increased, fuel is promoted to burn completely, and generation of solid particles is reduced; and due to the increase of the amount of circulating tail gas, the nitrogen element in the air is prevented from being converted into NOx, and generation of the NOx is reduced. By the adoption of the tail gas circulation treatment system, the amount of two main pollutants including the NOx and PM in diesel tail gas can be effectively reduced, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to the relevant technical field of diesel engine energy saving and emission reduction, in particular to a large-scale diesel engine tail gas circulation treatment system and treatment method. Background technique [0002] Diesel engines have been widely used due to their high power and high efficiency, and have made great contributions to the progress of the navigation industry. However, due to the poor fuel quality of diesel engines, especially in large ships, heavy oil is often used as fuel, and the exhaust gas is more serious to the pollution of the environment. The exhaust gas emitted by diesel engines is mainly NOx and PM. For the treatment technology of exhaust gas, there are currently three main methods: organic pre-treatment, internal purification and exhaust post-treatment. The pre-engine treatment is mainly achieved by improving the quality of fuel, such as adding some additives to the fuel, appropriately increasing the...

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Problems solved by technology

[0003] However, the existing EGR system can generally meet the requirements for the environment. As the environmental conditions become more and more stringent on the emission of combustion exhaust, in some cases, more in-depth treatment of the exhaust gas is required.

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