Diesel and methanol dual-fuel system of internal combustion locomotive engine and method

Abstract

The invention discloses a diesel and methanol dual-fuel system of an internal combustion locomotive engine and a method. The dual-fuel system comprises a diesel engine and further comprises a methanolsupplying system, a methanol sprayer assembly and a methanol spraying control system; the methanol supplying system comprises a methanol tank, a methanol filter, a methanol pump, a methanol flowmeter, a distribution box and a methanol pressure-limiting valve, and the methanol tank is sequentially connected with the methanol pump, the methanol flowmeter and the distribution box through pipelines;the distribution box comprises an input end and a plurality of output ends, and each output end is sequentially connected with the methanol pressure-limiting valve and the methanol sprayer assembly through pipelines; the methanol sprayer assembly comprises a methanol rail, a methanol rail pressing plate, a methanol spraying nozzle and a gas inlet bent pipe; and the methanol spraying control systemcomprises a methanol electronic control unit, a control wire harness, an upper computer, a rotating speed sensor, a coolant temperature sensor, a throttle position sensor, a methanol liquid level meter and a fault alarm device.

Description

technical field [0001] The invention relates to the technical field of locomotive engines, in particular to a diesel-methanol dual-fuel system and method for a large-bore and high-power internal combustion locomotive engine. Background technique [0002] In recent years, electric locomotives have developed rapidly, but the construction and maintenance costs of electrified tracks are high, making the operating costs of electric locomotives high, and electric locomotives have strict requirements on the actual operating environmental conditions, while the operation of diesel locomotives is not limited by electricity. Occasionally, diesel locomotives have irreplaceable advantages. The current diesel locomotive still uses diesel as the main fuel, and the diesel burns in the way of diffusion combustion in the cylinder, which inevitably leads to high soot and NOx emissions. In order to meet the increasingly stringent emission regulations, in addition to improving in-cylinder combu...

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Problems solved by technology

[0003] The miscibility of diesel oil and methanol is very low. If the method of direct blending is adopted, a co-solvent needs to be added, which increases the cost of use, and even if a co-solvent is added, a large proportion of blending cannot be achieved, and separation will still occur when the ambient temperature changes. Layer, in actual use will also face cold start difficulties

Chinese patent CN1470752A discloses diesel / methanol combined combustion technology (Diesel Methanol Compound Combustion, DMCC), which proposes to inject methanol into the intake port of the diesel engine, form a homogeneous mixture with air into the cylinder, and then directly inject diesel into the cylinder to ignite The mixed gas of methanol and air, this method is flexible and convenient in practical application, does not need to make major changes to the original machine, and can achieve a high replacement rate, but this patent is proposed based on small and medium power vehicle diesel engines, and The power of diesel engines for ordinary vehicles determines that there is no demand for large flow of methanol supply. At the same time, the intake boost pressure of diesel engines for ordinary vehicles is lower than that of locomotives. Methanol nozzles with low injection pressure cannot meet the requirements of locomotives.

At present, there is CN105443241A patent document on the application of methanol to diesel locomotives, but this invention has the following disadvantages: first, its alcohol supply pipeline adopts a multi-stage structure of one divided into two and two divided into four, and is equipped with two-stage methanol pumps. The number of methanol filters and pressure limiting valves has also doubled, making the entire alcohol supply system complex in structure, low in reliability, high in cost, and low in practicability. Application occasions; third, the control method is single. The system must install sensors to collect the original machine speed, water temperature and throttle signals to control methanol injection. The dual-fuel mode cannot be used in situations where it is inconvenient or impossible to collect the above signals

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