Post-treatment system, desulfurization device thereof, control method and storage medium

Abstract

The invention relates to a post-treatment system, a desulfurization device thereof, a control method and a storage medium. The desulfurization device comprises a renewable sulfur trap, a storage type sulfur trap and a first three-way valve, and the renewable sulfur trap and the first three-way valve are sequentially arranged at the upstream of a main post-treatment device along the exhaust flow direction. An inlet of the first three-way valve communicates with an outlet of the renewable sulfur trap, a first outlet of the first three-way valve communicates with an inlet of the main post-treatment device, a second outlet of the first three-way valve is connected with a bypass pipeline, and a storage type sulfur trap is arranged on the bypass pipeline. According to the desulfurization device, the toxicity to the main post-treatment device during regeneration of the renewable sulfur trap can be avoided, the regeneration interval of the renewable sulfur trap does not need to be prolonged, the volume of the renewable sulfur trap does not need to be increased, and the exhaust back pressure is not influenced during non-regeneration; and the storage type sulfur trap is only used for trapping sulfide released during regeneration of the renewable sulfur trap, so that the storage type sulfur trap is long in service life and does not need to be frequently replaced.

Description

technical field [0001] The invention relates to the technical field of engine aftertreatment, and in particular to an aftertreatment system, a desulfurization device, a control method and a storage medium thereof. Background technique [0002] Diesel engine aftertreatment system is prone to sulfur poisoning, which affects the adsorption of NOx, resulting in substandard emissions. In order to reduce the damage of sulfur dioxide, hydrogen sulfide, etc. to post-processing components, sulfur traps are generally installed upstream of post-processing devices, such as figure 1 As shown, the purpose is to remove sulfur compounds (H 2 S, SO 2 , SO 3 etc.), to improve the sulfur poisoning of post-treatment devices, and current sulfur traps generally include renewable sulfur traps and storage sulfur traps, among which, if figure 1 The scheme uses a renewable sulfur trap. Since the renewable sulfur trap needs to be regenerated regularly, the sulfides generated during the regeneratio...

AI Technical Summary

Problems solved by technology

[0002] Diesel engine post-treatment system is prone to sulfur poisoning, which affects the adsorption of NOx, resulting in substandard emissions

In order to reduce the damage of sulfur dioxide, hydrogen sulfide, etc. to post-processing components, sulfur traps are generally installed upstream of post-processing devices, such as figure 1 As shown, the purpose is to remove sulfur compounds (H 2 S, SO 2 , SO 3 etc.), to improve the sulfur poisoning of post-treatment devices, and current sulfur traps generally include renewable sulfur traps and storage sulfur traps, among which, if figure 1 The scheme uses a renewable sulfur trap. Since the renewable sulfur trap needs to be regenerated regularly, the sulfides generated during the regeneration process will poison the aftertreatment device. To prolong the regeneration time interval, it is necessary to increase the sulfur capture capacity. The volume of the filter increases the exhaust back pressure, and it is inconvenient to arrange the whole vehicle. If a storage type sulfur trap is used, it needs a larger space and needs to be replaced regularly to meet the desulfurization filtration efficiency, which affects the layout of the whole vehicle.

Images