Water spray device capable of reducing NOx emission of dual-fuel engine of fishing boat

Abstract

The invention discloses a water spray device capable of reducing NOx emission of a dual-fuel engine of a fishing boat. The water spray device comprises a main body, namely, the dual-fuel engine; an exhaust temperature sensor, a rotating speed sensor and a crankshaft position sensor on the dual-fuel engine are electrically connected with an ECU (electronic control unit) through wires. The water spray device further comprises a pure water box; the pure water box is in series connection with a water pump, a water quantity control valve, a flowmeter and a plurality of spray nozzles sequentially; the water quantity control valve is electrically connected with the ECU through a wire; and positions of the spray nozzles correspond to those of air cylinders. The water pump sucks water from the pure water box, due to the action of a pressure maintaining valve, pressure of water flowing out of the water pump is stabilized at two barometric pressure, excess water flows back to the pure water box, and the ECU, according to the crankshaft position sensor, sprays the water into the air cylinders through the spray nozzles at the later stages of exhaust strokes of pistons. The ECU controls the water quantity control valve through the pulse width and a spray cycle and thus controls the water spray quantity, and receives and adjusts a numerical value of a water quantity sensor, thereby achieving the air humidifying and cooling effects.

Description

technical field [0001] The invention relates to the technical field of dual-fuel engines, in particular to a method for reducing NO of a dual-fuel engine for fishing boats X Discharge sprinkler. Background technique [0002] Since 2010, a variety of diesel-engine ships have carried out inland waterway diesel-LNG hybrid real ship transformation and sailing tests. However, the statistics of the sailing test show that the NOx emission performance of the domestically modified dual-fuel engine is only slightly better than that of the pure fuel model, and the NOx emission has not been significantly improved, far from reaching the NOX emission standard of Tier III of the International Maritime Organization. my country's first standard for air pollutant emissions from ships in inland rivers, "Ship Engine Exhaust Pollutant Emission Limits and Measurement Methods (China's First and Second Stages)", also known as National Exhaust, has been solicited for the second time, and the specif...

AI Technical Summary

Problems solved by technology

The disadvantages are: 1) Excessive water spray will cause liquid water to enter the cylinder, and the liquid water droplets will dilute the lubricating oil film on the cylinder liner, which will easily cause the wear of the cylinder liner

2) No effect on particulate PM emissions

[0008] In-cylinder direct water injection technology is mainly used in large-scale low-speed diesel engines, and requires an independent high-pressure water supply system and injection control system to control injection timing and injection volume. Shorter and has strict requirements on water cleanliness

Generally speaking, it is difficult to realize direct water injection in the cylinder, the cost is high, and the durability is poor, so it is not suitable for medium and high-speed diesel engines

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