Al-LiH composite fuel for unmanned underwater vehicle and preparation method thereof

Abstract

The invention provides an Al-LiH composite fuel for an unmanned underwater vehicle and a preparation method thereof, and belongs to the technical field of fuel for underwater vehicles. The Al-LiH composite fuel is powder comprising main phase aluminum (Al) and dispersed phase lithium hydride (LiH), wherein the LiH is uniformly dispersed in aluminum powder. The preparation method comprises the following steps of: weighing aluminum powder and lithium hydride, mixing the substances uniformly, putting the mixture into a ball milling tank, performing sealing, and carrying out ball milling in a ballmill to obtain the Al-LiH composite fuel. The Al-LiH composite fuel prepared by the invention has micro-explosion performance when being subjected to combustion reaction with high-temperature water vapor, and Al2O3 on the surface of Al powder can be continuously removed, therefore, the Al-LiH composite fuel has the characteristics of high energy, high density, quick start with water, high-efficiency combustion and high hydrogen yield.

Description

technical field [0001] The invention belongs to the technical field of fuel for underwater vehicles, in particular to an Al-LiH composite fuel for unmanned underwater vehicles and a preparation method thereof. Background technique [0002] The ocean is of great strategic significance to our country. The development and utilization of marine resources and the protection of my country's marine rights and interests require various high-tech means. To defend national security and build a maritime power, cutting-edge technology is even more needed. Underwater vehicle technology is an important means to achieve the above goals, and it is an area that countries have paid much attention to. [0003] The power system determines the overall design and endurance of the underwater vehicle. Its endurance, voyage depth, speed, and how many sensors it carries all depend on the performance of the energy and power system. The underwater hybrid system based on aluminum / water combustion has t...

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Problems solved by technology

[0006] (1) Aluminum is very active and highly reactive, and is easily oxidized in the air, and the dense oxide film formed on the surface prevents the reaction from proceeding;

[0007] (2) Even if the surface oxide film is removed, the Al 2 o 3 It will also continue to adhere to the unreacted aluminum surface, hindering the continuous progress of the reaction, reducing the reaction rate and reaction conversion rate; it is very difficult to start the reaction between micron-sized metal aluminum powder and water, usually at a high temperature of about 1000°C. The reaction between aluminum powder and water vapor occurs;

[0008] (3) In order to improve the reactivity, some studies use nano-aluminum powder, but the nano-aluminum powder has a large specific surface area and low active aluminum content, which leads to a decrease in the energy performance of the propulsion system. Increase in magnitude (about 20 to 50 times that of micron aluminum powder)

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