A post-processing system and its desulfurization device, control method and storage medium

Abstract

The invention relates to a post-processing system and its desulfurization device, control method and storage medium. The desulfurization device includes a renewable sulfur trap, a storage sulfur trap and a first three-way valve. The renewable sulfur trap The filter and the first three-way valve are sequentially arranged upstream of the main post-processing device along the exhaust flow direction. The inlet of the first three-way valve is connected with the outlet of the regenerative sulfur trap, and the first outlet of the first three-way valve is connected with the main aftertreatment device. The inlet of the post-processing device is connected, the second outlet of the first three-way valve is connected with a bypass pipeline, and the storage type sulfur trap is installed in the bypass pipeline; the regeneration of the regenerable sulfur trap can be avoided through the above desulfurization device It does not need to prolong the regeneration interval of the regenerative sulfur trap, nor does it need to increase the volume of the regenerative sulfur trap. During non-regeneration, it does not affect the exhaust back pressure, but The storage sulfur trap is only used to capture the sulfur compounds released during the regeneration of the renewable sulfur trap, which has a long service life and does not need to be replaced frequently.

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...

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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.

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