Methanol supply device for fuel-methanol dual-fuel engine and using method of methanol supply device

Abstract

The invention discloses a methanol supply device for a fuel-methanol dual-fuel engine and a using method of the methanol supply device. The methanol supply device comprises a methanol pump, a methanol rail, a rail pressure sensor, a gas inlet pipe and a pressure adjusting device, wherein two ends of the methanol pump are respectively communicated with a methanol box and the methanol rail; the rail pressure sensor and a nozzle which is communicated with the gas inlet pipe are arranged on the methanol rail; an output end of the pressure adjusting device is communicated with the methanol box, and an input end of the pressure adjusting device is communicated with the methanol rail and a gas inlet pressure guide pipe; the other end of the gas inlet pressure guide pipe is communicated with the gas inlet pipe; the methanol pump is a pressure pre-adjustable methanol pump; and the pressure adjusting device is a pressure compensation valve, and the spillway discharge of the pressure adjusting device is set in a mechanical or automatic mode. The methanol supply device can ensure the stability of the differential pressure between the rail pressure and the airway pressure, and the stability of the input methanol quantity of the methanol pump, simplifies a control strategy of methanol quantity output, and enhances the safety of the nozzle.

Description

technical field [0001] The invention relates to a methanol supply device, in particular to a methanol supply device for a fuel-methanol dual-fuel engine and a method for using it, and is particularly suitable for stabilizing the pressure difference between an alcohol rail and an intake pipe through two-stage pressure regulation. Background technique [0002] Among the alternative fuels for engines and automobiles, methanol meets the quality requirements for alternative fuels in terms of source, economy, and purification, and has been used in engines and complete vehicles. Methanol as an alternative fuel has two application methods: pure combustion and blended combustion. Among them, pure combustion requires a new design of the engine, while blended combustion has better inheritance of the engine body and is easier to apply. [0003] Since methanol and fuel supply systems are relatively independent, ignition of methanol by fuel oil is a better blending method. In this method,...

AI Technical Summary

Problems solved by technology

[0007] First of all, the pressure regulating valve used in this utility model is a fuel pressure regulator. The fuel pressure regulator is a mechanical structure and relies on the diaphragm of the regulating valve for pressure regulation. It can only work normally in a narrow methanol flow output range (0–20l / h);

[0008] Secondly, because the utility model cannot normally adjust the rail pressure within a wide methanol flow output range, the rail pressure fluctuates too much, which leads to too large fluctuations in the back pressure of the alcohol pump, making it difficult to stabilize the input alcohol volume of the alcohol pump , which further increases the difficulty of controlling the methanol flow rate output by the nozzle;

[0009] Thirdly, because the utility model cannot normally adjust the rail pressure within a wide methanol flow output range, the rail pressure fluctuates too much. Therefore, when the nozzle outputs a small flow rate, the rail pressure is high, and it is easy to exceed the tolerance of the nozzle. Pressure, facing the risk of high-pressure methanol damage the nozzle into the cylinder, less security

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