Internal combustion engine nitrogen oxide efficient control system and working method thereof

Abstract

The invention relates to an internal combustion engine nitrogen oxide efficient control system and a working method thereof. As a middle temperature SCR denitration temperature window is 300-400 degrees centigrade, the exhaust gas temperature of an internal combustion engine is generally higher than 400 degrees centigrade, and a middle temperature catalyst works under a high temperature environment for a long time, the denitration efficiency is not high, and the service life of the middle temperature catalyst is also greatly shortened. According to the internal combustion engine nitrogen oxideefficient control system, the internal combustion engine, a heat exchanger, a middle temperature SCR reactor, a flue gas lithium bromide unit and a chimney are connected with each other in sequence,a water storage tank is connected with the heat exchanger, and the heat exchanger is connected with a steam lithium bromide unit. The heat exchanger is placed between the internal combustion engine and a middle temperature SCR denitration system; an optimal temperature of 350+ / -20 degrees centigrade needed by middle temperature SCR reaction is obtained by controlling heat exchanging amount of theheat exchanger; and meanwhile, steam generated by the heat exchanger enters another lithium bromide unit to finish the refrigeration process. According to the internal combustion engine nitrogen oxideefficient control system, a purpose of efficiently removing NOx in the flue gas can be achieved; and the influences on the operations of the lithium bromide units are smaller.

Description

technical field [0001] The invention relates to the field of flue gas denitrification in internal combustion engine energy stations, in particular to the SCR flue gas denitrification technology suitable for high exhaust gas temperature of gas internal combustion engines. Background technique [0002] The internal combustion engine uses natural gas or fuel oil as fuel, drives the generator to generate electricity through combustion, and generates high-grade electric energy. After stable operation, the exhaust gas temperature is generally above 400°C (the normal operating temperature is around 450°C), and the temperature of the cylinder jacket water of the internal combustion engine Above 90°C, in order to make full use of the temperature of the flue gas discharged from the internal combustion engine and the temperature of the cylinder jacket water, a flue gas hot water type lithium bromide unit is generally installed behind the internal combustion engine, and the heat of the h...

AI Technical Summary

Problems solved by technology

In the present invention, a heat exchanger is arranged at the outlet of the internal combustion engine to solve the limitation of the flue gas temperature on the denitrification of the medium-temperature catalyst. The SCR reactor is arranged behind the heat exchanger, and the flue gas after denitration enters the lithium bromide unit

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