Preface

The 6 most commonly asked questions about "using castings to load hydrogen, ammonia, and methanol into internal combustion engines".

A: Hydrogen fast burning, ammonia flame retardant, and methanol with corrosiveness have significantly different combustion temperature fields and gas compositions from diesel; Casting must be re matched with cooling water channel layout, material purity, and defect control, otherwise thermal fatigue and corrosion will first ignite from the blank layer.

A: The hydrogen flame heats up quickly, and the instantaneous temperature difference on the combustion surface is significantly higher than that of a diesel engine; Casting requires the use of sand mold 3D printing of conformal water channels, compressing the cooling wall thickness to the 3mm level, in order to control the thermal gradient within the allowable durability range.

A: Ammonia combustion produces more NOx precursors and is accompanied by local low temperature zones, and insufficient cooling can easily form nitrogen corrosion pits; Low combustion efficiency and the need for co firing "means that the cylinder block and cylinder head must simultaneously withstand different thermal loads from two fuels, which puts higher demands on casting density and surface integrity.

A: There are many impurities in the ash alcohol, and the combustion of ash accelerates the abrasive wear of the combustion surface of the cylinder head; Through furnace purification and low impurity sand casting, the Fe content of the aluminum liquid can be reduced to 0.1%, while improving the surface smoothness of the water channel, reducing wear and corrosion, and leaving room for subsequent green alcohol upgrades.

A: After the combustion of hydrogen/ammonia fuel, a large amount of water vapor is generated. Poor exhaust of sand cores can form air pockets in the inner cavity of the cylinder wall, leading to insufficient watering or microcracks; By using 3D printing with a flexible airway and low gas generation resin, the gas generation can be significantly reduced, and the one-time pass rate of casting can be significantly improved.

A: The cooling of zero carbon internal combustion engines needs to be redesigned by using 3D printing to create sand molds. The conformal water channel can be formed in one go, reducing the cooling wall thickness to the 3mm level. The temperature difference between the firing surfaces is significantly reduced, and the impurities in the sand mold are at an extremely low level, which helps to suppress hydrogen embrittlement and ammonia corrosion.

two thousand and twenty-five

summary

Zero carbon power is not just about electricity; First, make the cylinder head "unbreakable", then talk about the engine "not emitting carbon".

In collaboration with Kangshuo Group,See you in Nanjing！