Siphon type Adblue urea adding method and device

Abstract

The invention discloses a siphon type Adblue urea adding method and device. An output end of an Adblue urea storage tank is connected with an Adblue urea input end of a siphon spray gun by a measurement electromagnetic valve, the liquid level of the Adblue urea storage tank is higher than the liquid level of the siphon spray gun; a compressed air source is connected with an air input end of the siphon spray gun, and negative pressure is formed on the outlet of the siphon spray gun; a control unit is connected with the measurement electromagnetic valve to control the starting frequency and the opening degree of the measurement electromagnetic valve. The Adblue urea and the compressed air are mixed outside and then sprayed into an engine exhaust pipe at the state of gas-liquid mixture, the crystal problem of an Adblue urea channel is solved, and the measurement precision and the atomization quality of the Adblue urea are increased; a measurement pump is not needed, so that the manufacture difficulty and the production cost of the adding device are reduced; the requirement for electric heating is lowered, and the extra engine power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of engine emission control, in particular to a blue filling method and device required by diesel engine selective catalytic reduction (hereinafter referred to as "SCR") technology. Background technique [0002] Nitrogen oxides (hereinafter referred to as "NO X ") is one of the main harmful emissions of the engine, and the pollution to the atmosphere is getting heavier and has been widely concerned. With the continuous upgrading of emission regulations, engine manufacturers at home and abroad tend to use SCR technology to reduce the NO of diesel engines X emission. [0003] Tianlan is the reducing agent used in SCR technology, and its filling amount directly affects the NO X Therefore, the filling quality of Tianlan is the core problem to be solved by SCR technology. [0004] The current Tianlan filling device of the SCR system mainly uses a metering pump. Tianlan and compressed air are mixed inside the pu...

AI Technical Summary

Problems solved by technology

This method mainly has the following problems: the mixing chamber inside the pump head is very small, and Tianlan is easy to form crystals in the mixing chamber, resulting in inaccurate Tianlan flow rate and reduced atomization quality; the metering pump undertakes the specific execution tasks of the required Tianlan flow rate , is a precision metering component, and its design is difficult and costly; components such as Tianlan tanks, pump heads, suction pipes, and liquid return pipes that store Tia

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