External hydrocarbon injection device

Abstract

The invention discloses an external hydrocarbon jetting device which comprises a control manifold, a fuel oil electromagnetic valve, a fuel injector, a pressure sensor, a buffer device and a controller. The control manifold is provided with four ports; the ports communicate mutually so as to form a hollow chamber; the controller is electrically connected with the fuel oil electromagnetic valve, the fuel injector and the pressure sensor; one port of the control manifold is connected with a hydrocarbon source through the fuel oil electromagnetic valve; one port of the control manifold is connected with the fuel injector; one port of the control manifold is connected with the pressure sensor; one port of the control manifold is connected with the buffer device; the controller controls the fuel oil electromagnetic valve to power on so as to switch on; the hydrocarbon source enters the control manifold through the fuel oil electromagnetic valve, flows to the fuel injector and is injected; the pressure sensor detects the hydrocarbon pressure in the control manifold and back-feeds to the controller; and the controller controls the flow of injected hydrocarbon compounds through controllingthe power-on and power-off time of the fuel injector. According to the external hydrocarbon jetting device provided by the invention, a temperature control performance in a tail gas treatment systemcan be improved, and meanwhile, the warranty cost is reduced.

Description

Technical field [0001] The invention relates to a hydrocarbon injection device in an exhaust gas treatment system, in particular to an external hydrocarbon injection device. Background technique [0002] Exhaust gas from the engine has been determined to be the main cause of air pollution. Exhaust gas treatment systems can be used in the prior art to remove air pollutants in the exhaust gas. In exhaust gas treatment systems, diesel particulate filters (DPF) are commonly used to capture particulate matter (PM), which may include unburned hydrocarbon particles (soot) and small amounts of other particles, such as metal oxide particles (ash) . The particulate matter accumulates in the DPF. Before the accumulation causes the back pressure of the engine to be too high, a regeneration process is required to remove the accumulated soot. [0003] Usually in the regeneration process, a heating device is used to raise the exhaust gas temperature to a level where the soot can be effectively ...

AI Technical Summary

Problems solved by technology

[0007] Low hydrocarbon conversion efficiencies can be caused by "real" inefficiencies caused by problems in the heat generating unit and DPF (e.g. plugged DOC, sulfur poisoning, catalyst particle buildup in the DOC or DPF, etc.), or by problems with hydrocarbon metering injection "Show" inefficiencies (e.g. inaccurate hydrocarbon metering injection)

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