Duct burner for diesel engine

Abstract

The invention provides a duct burner for a diesel engine. The outer cylinder wall of the burner is arranged on the outer part of the inner cylinder wall of the burner in a nesting mode, the end of theinner cylinder wall is sealed and provided with an ignition gun and an oil gun, the other end of the inner cylinder wall of the burner is opened as a flue gas outlet, and flue gas inlets are formed in the inner cylinder wall of the burner and the outer cylinder wall of the burner; a firing stabilizer is arranged in the inner cylinder wall of the burner and located on the rear side of the oil gun,and a fire detection device is arranged on the rear part of a nozzle of the firing stabilizer. According to the duct burner, the fuel ignition conditions are improved by preheating air, and when theduct burner is operated at low power and low oxygen content, the normal combustion of the small-flow fuel is ensured; because of the two-stage atomization mode, the particle diameter of the fuel is smaller, the distribution is more uniform, and the combustion is better under the low-power and low-oxygen environment; by adjusting the relative position of inner and outer casings of the oil gun, thefuel flow can be adjusted auxiliarily, and the exhaust gas temperature is facilitated to be more accurately controlled; and the fuel and an atomizing medium can be fully accelerated by a two-stage spray pipe structure of the head of the oil gun, the atomization effect is enhanced, and thus the fuel is better ignited and burned.

Description

Technical field [0001] The invention belongs to the technical field of industrial burners, and particularly relates to an afterburner for diesel engines. Background technique [0002] Diesel engines emit toxic gases such as carbon monoxide and nitrogen oxides due to insufficient combustion. At present, the main method for treating nitrogen oxides in exhaust gas is selective catalytic reduction, that is, using a reducing agent containing ammonia under the action of a catalyst to reduce nitrogen oxides in exhaust gas to pollution-free nitrogen and water. The reduction reaction temperature is required to be 300-400°C. However, the exhaust gas temperature of ordinary diesel engines is difficult to meet the requirements, so it is necessary to increase the exhaust gas temperature before performing selective catalytic reduction SCR treatment. Therefore, it is necessary to develop an afterburner that can increase the temperature of diesel engine exhaust. [0003] The combustion-supporti...

AI Technical Summary

Problems solved by technology

Moreover, the heating power required to increase the temperature of the flue gas is generally small. Therefore, compared with ordinary burners, the afterburner burner uses less fuel, and factors such as spray gun clogging have a more significant impact on the performance of the afterburner burner. It is also more difficult to precisely adjust the power of the burner

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