Tail gas after-treatment pipeline system for internal combustion engineering machinery

Abstract

The invention discloses a tail gas after-treatment pipeline system for internal combustion engineering machinery. A main water inlet pipe is arranged at the front end of the pipeline system, one end of the main water inlet pipe is connected with an internal combustion engine cooling water pipeline in a communicating manner, warm water in the internal combustion engine cooling water pipeline is delivered into a urea box, and urea in the urea box is heated in a circulating manner; and meanwhile, the warm water in the internal combustion engine cooling water pipeline is delivered into a DRT pipe, and a urea injection device in the DRT pipe 3 located in an internal combustion engine high-temperature exhaust system is cooled. The back end of a cooling water pipeline communicates with a water return pipeline of the internal combustion engine cooling water pipeline from a water outlet of the DRT pipe, and a closed-loop circulation system of the cooling water pipeline is formed. With the system, the reliability of a tail gas treatment device for the internal combustion engineering machinery is improved, a urea solution for chemical reactions can be timely and effectively supplied to an after-treatment device, and thus exhausted tail gas can meet the standard requirements. According to the system, pipelines are arranged clearly and are connected reliably, and mounting and dismounting are easy.

Description

technical field [0001] The invention belongs to the field of internal-combustion engineering machinery, and in particular relates to an exhaust gas post-treatment pipeline system of internal-combustion engineering machinery. Background technique [0002] In order to control the nitrogen oxides in the exhaust gas, most internal combustion engine manufacturers adopt the SCR technology route, in which the SCR equipment is used for the reduction reaction of the gas mixed with the nitrogen oxides and urea solution under the action of the catalyst to convert it into nitrogen and water. [0003] Due to the crystallization of urea solution in a low temperature environment, the pipeline will be blocked, resulting in the inability of the urea pump to effectively provide urea solution for chemical reactions, resulting in substandard emissions; and the injection device of the DRT pipe for urea solution is connected in series in the exhaust pipeline system Among them, its temperature is ...

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Problems solved by technology

Due to the mechanical failure of the solenoid valve in water heating, such as wear and tear, it may cause the heating failure of the urea tank. Th

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