Pressure stabilizing supply unit of marine SCR urea injection system

Abstract

The invention discloses a pressure stabilizing supply unit of a marine SCR urea injection system. The pressure stabilizing supply unit comprises a urea tank, a main pump supply branch, a standby pump supply branch, a frequency converter, a controller and a liquid return pipeline. The main pump supply branch comprises a first liquid inlet pipe, a first urea supply device and a first injection pipe which are communicated in sequence, a first pressure sensor is arranged on the first injection pipe, the standby pump supply branch comprises a second liquid inlet pipe, a second urea supply device and a second injection pipe which are communicated in sequence, and a second pressure sensor is arranged on the second injection pipe. The other ends of the first injection pipe and the second injection pipe are both communicated with the injection metering unit, the controller simultaneously controls the first urea supply device and the second urea supply device through the frequency converter, one end of the liquid return pipeline is simultaneously communicated with the first injection pipe and the second injection pipe, the other end of the liquid return pipeline is communicated with the urea tank, and a flow control valve is further arranged on the liquid return pipeline. The first pressure sensor, the second pressure sensor and the flow control valve are all electrically connected with the controller.

Description

technical field [0001] The invention relates to the technical field of diesel engine tail gas treatment, in particular to a voltage stabilizing supply unit of a marine SCR urea injection system. Background technique [0002] Today, 80% of the world's international trade needs to be carried out by sea. With the continuous development of international trade and shipping, the number of ships is increasing rapidly. At the same time, under the trend of large-scale development of ships, the amount of exhaust gas emitted by marine diesel engines will increase significantly, thus It will lead to more serious marine air pollution, destroy the ecological environment, and aggravate the threat to human survival. According to statistics, the exhaust gas emitted by marine diesel engines around the world accounts for about 5% to 10% of air pollution, and some port cities even reach 30% to 40%. Diesel motor exhaust contains a large amount of particulate matter and nitrogen oxides. Nitrogen...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a voltage stabilizing supply unit of a marine SCR urea injection system, which can effectively solve the problems of large supply pressure fluctuations and small adjustment range

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