Device for preventing urea solution from freezing to crack container

Abstract

The invention discloses a device for preventing a urea solution from freezing to crack a container, which has the advantages of simple structure form, no increase in system size, reliable operation and low cost. The device is realized according to the technical scheme that an elastic material is placed in the urea solution container so as to prevent the urea solution from freezing to crack the container. The device does not need to increase the size of the urea solution container or reserve deformation quantity. The size of a urea solution storage container or a urea solution pressure container can be reduced, so that the difficulty of tight installation space caused by excessive accessories during the loading of a diesel engine SCR (Selective Catalytic Reduction) system is solved.

Description

technical field [0001] The invention belongs to the field of diesel engine tail gas nitrogen oxide pollution control equipment, and further relates to a device for preventing urea solution from freezing and cracking a storage container and a supply device in a diesel engine aftertreatment system. 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 nitrogen oxide emissions have always been a problem that plagues people. Selective catalytic reduction technology (SCR) is an effective method to control nitrogen oxides in diesel engines. This technology usually uses a certain concentration of urea solution (urea solution for vehicles) to selectively catalyze nitrogen oxides emitted from diesel engines. The urea solution for vehicles starts to freeze at -11°C, and the volume will expand by about 9%. Since the diesel engine or diesel vehicle will w...

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Problems solved by technology

The first method needs to increase the size of the container or increase the difficulty of container design, and is not suitable for a closed environment; the second method needs to increase the urea pump and reversing valve, and also increases the difficulty of the control system; the third method has special requirements for materials. Requirements, and not suitable for pressure vessels such as plenum chambers, in which case pressure fluctuations will increase; in addition, elastic materials will affect the sealing of the entire system after deformation, which may cause urea solution leakage or component damage

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