CN-121991644-A - Preparation method of magnesium-based hydride slurry and magnesium-based hydride slurry

CN121991644ACN 121991644 ACN121991644 ACN 121991644ACN-121991644-A

Abstract

The invention discloses a preparation method of magnesium-based hydride slurry and the magnesium-based hydride slurry, which relate to the technical field of energy storage, the technical scheme of the invention prepares a novel heat storage and heat transfer medium by adopting the high heat storage density of magnesium-based hydride, the high fluidity and the high heat conductivity of organic silicone oil. And the magnesium-based hydride catalyst TiMn 2 is added in the medium, the magnesium-based hydride catalyst TiMn 2 can reduce the environmental temperature required by the reaction of hydrogen released by the hydride, improve the reaction rate of hydrogen released by the hydride, effectively improve the heat storage density and the power generation efficiency in a photo-thermal power generation system, reduce the operation cost of the system and realize the efficient recycling of heat storage and heat release under the high-temperature condition.

Inventors

LIU HUANG
CHU PAN
ZHAO YU
YANG WEI
LIN DUN

Assignees

中石油深圳新能源研究院有限公司
中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. A method for preparing a magnesium-based hydride slurry for use in a photo-thermal power generation system, the method comprising the steps of: Preparing metal Ti and metal Mn according to the atomic mass ratio of Ti atoms to Mn atoms in the TiMn 2 , and placing the metal Ti and the metal Mn into a high-vacuum arc melting furnace for melting to obtain a magnesium-based hydride catalyst TiMn 2 ; Preparing MgH 2 compound and magnesium-based hydride catalyst TiMn 2 obtained by smelting according to a first composition ratio, placing the mixture into a ball milling tank with an air charging valve, filling stainless steel grinding balls into the ball milling tank, and sealing the ball milling tank; Filling hydrogen into a ball milling tank through an inflation valve, filling the ball milling tank into a planetary ball mill, and starting the planetary ball mill to obtain a magnesium-based hydride composite material; And (3) preparing organic silicone oil and the magnesium-based hydride composite material obtained after starting the planetary ball mill according to a second composition ratio, and placing the composite material into the same container for stirring to obtain magnesium-based hydride slurry.
2. The method for preparing a magnesium-based hydride slurry as claimed in claim 1, wherein the first composition ratio is 95-98wt% MgH 2 、5～2wt％TiMn 2 .
3. The method for preparing the magnesium-based hydride slurry according to claim 1, wherein the second composition ratio is 15-35 wt% of organic silicone oil and 85-65 wt% of magnesium-based hydride composite material.
4. The method for preparing magnesium-based hydride slurry according to claim 1, wherein the steps of preparing MgH 2 compound and magnesium-based hydride catalyst TiMn 2 obtained by smelting according to the first composition proportion, placing the mixture into a ball-milling tank with an inflation valve, filling stainless steel grinding balls into the ball-milling tank, and sealing the ball-milling tank under inert gas environment; And/or preparing the organic silicone oil and the magnesium-based hydride composite material obtained after starting the plasma ball mill according to the second composition ratio, and placing the magnesium-based hydride composite material into the same container for stirring, wherein the step of obtaining the magnesium-based hydride slurry is performed in an inert gas environment.
5. The method for preparing a magnesium-based hydride slurry according to claim 1, wherein the steps of preparing metal Ti and metal Mn according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn 2 , and placing the metal Ti and metal Mn into a high vacuum arc melting furnace for melting specifically comprise the steps of: Preparing metal Ti and metal Mn according to the atomic mass ratio of Ti atoms to Mn atoms in the TiMn 2 , and placing the metal Ti and the metal Mn into a clean high-vacuum arc melting furnace; Vacuum pumping is carried out in the vacuum arc melting furnace; introducing a small amount of argon into the vacuum arc melting furnace; starting the vacuum arc melting furnace to melt the metal Ti and the metal Mn in the melting furnace.
6. The method for preparing magnesium-based hydride slurry as claimed in claim 1, further comprising the steps of, before said step of disposing MgH 2 compound and magnesium-based hydride catalyst TiMn 2 obtained by smelting in the first composition ratio and placing them in a ball mill pot with an inflation valve: Under the inert gas environment, crushing the obtained magnesium-based hydride catalyst TiMn 2 into small pieces with the diameter of 1-10 mm by using a titanium alloy mortar and a pestle, putting the small pieces into a high-temperature high-pressure hydrogen reaction kettle, introducing 4MPa hydrogen, and heating the reaction kettle to 350 ℃.
7. The method of preparing a magnesium-based hydride slurry as claimed in claim 6, further comprising the steps of, before said step of disposing MgH 2 compound and magnesium-based hydride catalyst TiMn 2 obtained by smelting in a first composition ratio and placing them in a ball mill tank with an inflation valve: The heated small pieces were ground, and the ground powder was screened through a 200 mesh screen.
8. The method for preparing a magnesium-based hydride slurry according to claim 1, wherein the step of filling the ball mill tank with stainless steel balls comprises the steps of: And filling a plurality of stainless steel grinding balls with different diameters of 2-10 mm into the ball milling tank according to the ratio of the mass of the stainless steel grinding balls to the total mass of the MgH 2 compound and the magnesium-based hydride catalyst TiMn 2 which are put into the ball milling tank of 20:1.
9. The method for preparing magnesium-based hydride slurry as claimed in claim 1, wherein the step of charging hydrogen into the ball mill tank through the charging valve, charging the ball mill tank into a planetary ball mill, and starting the planetary ball mill to obtain the magnesium-based hydride composite material comprises the following steps: repeatedly introducing argon into the ball milling tank and exhausting air from the ball milling tank until oxygen in the ball milling tank is removed, and then filling hydrogen with the pressure of 10-20 MPa; Filling the ball mill tank into a planetary ball mill; setting the planetary ball mill as an intermittent operation mode, wherein the operation parameters are that the ball mill is operated for 30min, the suspension time is 30min, and the total operation time of the planetary ball mill is 3-6 h; Opening an exhaust valve of the ball milling tank to reduce the air pressure in the ball milling tank; argon is repeatedly introduced into the ball milling tank and the interior of the ball milling tank is pumped until hydrogen in the ball milling tank is removed; and opening the ball milling tank in an inert gas environment to take out the magnesium-based hydride composite material.
10. A magnesium-based hydride slurry, characterized in that the magnesium-based hydride slurry is produced by the method for producing a magnesium-based hydride slurry according to any one of claims 1 to 9.

Description

Preparation method of magnesium-based hydride slurry and magnesium-based hydride slurry Technical Field The invention relates to the technical field of energy storage, in particular to a preparation method of magnesium-based hydride slurry and the magnesium-based hydride slurry. Background Photo-thermal power generation is a mature renewable energy technology with wide application prospect, and is widely focused and studied in the global scope. In view of the intermittent and unstable nature of solar energy, thermal energy storage technology becomes a key component of a photo-thermal power generation system. In this system, common heat storage media include molten salts, heat transfer oils, solid materials, and the like. However, these heat storage media still face some limitations in practical applications. For example, the applicable operating temperature range of molten salt is relatively narrow. In view of this, it has become urgent to develop a new heat storage and transfer medium to improve the overall efficiency of the photo-thermal power generation system. Magnesium-based hydrides are considered to be a very potential thermochemical heat storage material due to their relatively high heat storage density. However, magnesium-based hydrides present challenges in the application of photo-thermal power generation systems, which have problems of high required temperature for hydrogen desorption and slower reaction kinetics. In addition, since magnesium-based hydrides are solid substances, they lack fluidity, which limits their applicability in practical photo-thermal power generation systems. Therefore, the material improvement and the technical innovation aiming at the problems are of great significance for promoting the application of the magnesium-based hydride in the field of photo-thermal power generation. Disclosure of Invention The invention mainly aims to provide a preparation method of magnesium-based hydride slurry and the magnesium-based hydride slurry, and aims to solve the problems of high temperature, slower reaction kinetics and lack of fluidity of magnesium-based hydride in the application of a photo-thermal power generation system. In order to achieve the above object, the preparation method of the magnesium-based hydride slurry provided by the present invention comprises the following steps: Preparing metal Ti and metal Mn according to the atomic mass ratio of Ti atoms to Mn atoms in the TiMn 2, and placing the metal Ti and the metal Mn into a high-vacuum arc melting furnace for melting to obtain a magnesium-based hydride catalyst TiMn 2; Preparing MgH 2 compound and magnesium-based hydride catalyst TiMn 2 obtained by smelting according to a first composition ratio, placing the mixture into a ball milling tank with an air charging valve, filling stainless steel grinding balls into the ball milling tank, and sealing the ball milling tank; Filling hydrogen into a ball milling tank through an inflation valve, filling the ball milling tank into a planetary ball mill, and starting the planetary ball mill to obtain a magnesium-based hydride composite material; And (3) preparing organic silicone oil and the magnesium-based hydride composite material obtained after starting the planetary ball mill according to a second composition ratio, and placing the composite material into the same container for stirring to obtain magnesium-based hydride slurry. In one embodiment, the first composition ratio is 95-98wt% of MgH 2、5～2wt％TiMn2. In one embodiment, the second composition ratio is 15-35 wt% of organic silicone oil and 85-65 wt% of magnesium-based hydride composite material. In one embodiment, the MgH 2 compound and the magnesium-based hydride catalyst TiMn 2 obtained by smelting are configured according to a first composition ratio and are placed into a ball milling tank with an inflation valve, stainless steel grinding balls are filled in the ball milling tank, and the sealing step of the ball milling tank is carried out in an inert gas environment; And/or preparing the organic silicone oil and the magnesium-based hydride composite material obtained after starting the plasma ball mill according to the second composition ratio, and placing the magnesium-based hydride composite material into the same container for stirring, wherein the step of obtaining the magnesium-based hydride slurry is performed in an inert gas environment. In one embodiment, the steps of preparing metal Ti and metal Mn according to the atomic mass ratio of Ti atoms to Mn atoms in the TiMn 2, and placing the metal Ti and the metal Mn into a high-vacuum arc melting furnace to perform melting specifically comprise the following steps: Preparing metal Ti and metal Mn according to the atomic mass ratio of Ti atoms to Mn atoms in the TiMn 2, and placing the metal Ti and the metal Mn into a clean high-vacuum arc melting furnace; Vacuum pumping is carried out in the vacuum arc melting furnace; introducing a small amount of argon into