Preparation method of core-shell structure Fe2O3-Al2O3/(Al@C) high-temperature composite phase-change heat accumulation oxygen carrier

Abstract

The invention relates to a preparation method of a core-shell structure Fe2O3-Al2O3 / (Al@C) high-temperature composite phase-change heat accumulation oxygen carrier and belongs to the technical field of high-temperature composite phase-change heat accumulation oxygen carriers. The preparation method adopts a sol-gel method; ethylenediamine tetraacetic acid and ethylene glycol are added into a mixedsolution of aluminum salt and iron salt, and are stirred at constant temperature until gel is formed; then a core-shell structure composite phase-change heat accumulation material is added and is uniformly mixed; then a mixture is roasted at high temperature to obtain the core-shell structure Fe2O3-Al2O3 / (Al@C) high-temperature composite phase-change heat accumulation oxygen carrier. The core-shell structure Fe2O3-Al2O3 / (Al@C) high-temperature composite phase-change heat accumulation oxygen carrier is composed of an inner core phase-change heat accumulation material aluminum, inner-layer aluminum nickel oxide, middle-layer carbon fibers and a shell ferro-aluminum oxygen carrier; a plurality of types of shell layers are stacked so that the structure of the heat accumulation oxygen carrieris more stable and a covering layer of a shell body is more dense; furthermore, a condition that aluminum with a fused state of an inner core is leaked to damage equipment can be effectively preventedand economic losses are reduced; meanwhile, the core-shell structure high-temperature composite phase-change heat accumulation oxygen carrier can effectively and reasonably utilize energy, the utilization efficiency of energy sources is improved and wastes of energy are avoided.

Description

technical field [0001] The invention relates to a core-shell structure Fe 2 o 3 -Al 2 o 3 The invention discloses a preparation method of (Al@C) high-temperature composite phase-change thermal storage oxygen carrier, which belongs to the technical field of high-temperature composite phase-change thermal storage oxygen carrier. Background technique [0002] CO 2 It is the main greenhouse gas that causes global warming. In recent years, global warming has caused incalculable losses to the production and life of people around the world. In this way, CO 2 Emission reduction is a very natural part of the global problem that needs to be solved urgently. In 1983, German scholars Richter and Knoche first proposed a new technology of non-mixed combustion of fuel and air. The original intention was to reduce the entropy change produced in the gas combustion process of thermal power plants, thereby improving the efficiency of energy use. Later, the technology was officially ren...

AI Technical Summary

Problems solved by technology

[0005] Although the Ni-based oxygen carrier has very high reactivity, it is easy to generate toxic sulfides during the reaction process, and its own porous nature leads to a low reaction rate; the Cu-based oxygen carrier is easily decomposed into Cu 2 O, and under high-temperature reaction conditions, sintering often occurs due to its low melting point, and the reaction rate of Cu-based oxygen carriers decreases rapidly after several cycles of reaction

Although Co, Mn, Cd, etc. have good performance, they are expensive; the existing Fe-based oxygen carrier loses lattice oxygen after deep reduction, which is difficult to be replenished, which is not conducive to the cyclic operation of the reaction.

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