Air discharge heating apparatus, system and method for diesel engine under full operating condition

Abstract

The invention relates to a device, a system and a method for exhausting and heating under all operating conditions of a diesel engine, and belongs to the technical field of pollution control of tail gas particle. The heating device comprises a first-stage combustion chamber, a second-stage combustion chamber and a third-stage combustion chamber orderly connected in series with a shell, a whirlpool groove, a tapered spoiler, a spoiler groove, a triangular support of the tapered spoiler, a first-stage combustion oil supply pipe, a circular fuel oil evaporating pipe, a third-stage combustion oil supply pipe, an air intake guide cylinder, a fresh air guide cylinder, an exhaust tapered air inlet, an air inlet and an air intake baffle. An electronic control unit judges whether to regenerate by monitoring exhaust temperature and pressure at two ends of a particle catcher; when regeneration is needed, oxygen content in the exhausted air is judged, and when the oxygen content is lower than a preset value, an air pump is controlled to provide little air so as to reliably ignite under all operating conditions. The device, the system and the method have the advantages of low energy consumption, simple operation method, high combustion efficiency and reliable operation, and can work under all the operating conditions of an engine.

Description

[0001] The invention belongs to the technical field of diesel engine tail gas particulate pollution control, and further relates to a device, system and method for heating exhaust gas of a diesel engine under all working conditions. Background technique [0002] Diesel engines have been widely used in various industries all over the world due to their high thermal efficiency and low exhaust emissions, but their high particulate emissions have always been a problem that plagues people. A particulate filter (DPF) is an effective method of controlling diesel particulates. Although the trapping efficiency of the current trap can reach more than 90%, the removal of particles after trapping (that is, the regeneration of the trap) is the main reason restricting the application of the trap. [0003] Thermal regeneration is a more commonly used regeneration method for particulate traps. Increase the exhaust gas temperature by heating or directly selectively heat the particles to burn ...

AI Technical Summary

Problems solved by technology

[0006] (1) Electric heating, microwave heating, and infrared heating are used for regeneration, and the energy conversion during the regeneration process will cause a large amount of energy loss; in addition, the energy required for regeneration basically comes from the battery, and the power consumption of the heating device during the regeneration process is large, which brings a lot of energy to the battery. For this reason, it is usually necessary to install a generator and adopt bypass regeneration, resulting in a complex structure of the regeneration system

[0007] (2) In-cylinder post-injection or exhaust pipe injection is used for fuel injection and combustion-supporting heating. In-cylinder post-injection is only suitable for high-pressure common rail diesel engines, and because part of the diesel oil will seep into the oil pan to dilute the engine oil, the engine wear will be increased and the service life will be shortened. ;The exhaust pipe injection must be combined with the oxidation catalytic converter to oxidize the injected fuel to increase the exhaust temperature, and the oxidation catalytic converter is very sensitive to the sulfur content in the fuel, and the catalyst is easy to fall off at high temperature, and the service life is longer short

[0008] (3) Due to the limitation of the space structure, the particulate filter is usually far away from the engine. When the fuel injection combustion-assisted regeneration is used, the energy generated is lost along the pipeline, resulting in a low energy utilization rate during the regeneration process

[0009] (4) Adding additives to diesel fuel can slow down the particle accumulation rate of the particulate filter and prolong the regeneration period of the particulate filter. Regeneration is poor

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