Spinel castables for coal water slurry gasification furnace and using method thereof

Abstract

The invention relates to spinel castables for a coal water slurry gasification furnace and a using method thereof. The spinel castables comprise, by weight, 55-72% of magnesium aluminate spinel particles, 0-15% of tabular corundum particles, 4-10% of magnesium aluminate spinel fine powder, 2-5% of magnesium aluminate spinel micro powder, 4-6% of alpha-Al2O3 micro powder, 0.5-1.5% of Y2O3 micro powder, 0.5-1.5% of CeO2 micro powder, 0.2-1% of TiO2 micro powder, 1-7% of pure calcium aluminate cement, 2-12% of CMA cement, 0.03-0.1% anti-explosion fibers, and 0.1-0.3% of FS series water reducer. The using method comprises the steps of pouring water which accounts for 4.8-6.2%, by weight, of the castables in the castables, stirring evenly, and carrying out forming, conservation, demoulding and baking. Products prepared through the spinel castables for the coal water slurry gasification furnace have the advantages of being environmentally friendly, good in coal slag permeation resistance and anti-corrosion performance, capable of saving energy, high in strength and good in thermal shock stability, and thus demands of the production of the coal water slurry gasification furnace are met.

Description

technical field [0001] The invention belongs to the technical field of spinel castables, and in particular relates to a spinel castable for a coal-water slurry gasification furnace and a use method thereof. Background technique [0002] With the development of coal chemical technology, the proportion of coal as a chemical raw material continues to increase, and new coal gasification technology has developed rapidly. Coal-water slurry gasifier uses coal-water slurry as raw material to produce CO and H 2 The main mixed gas device. In this device, the coal-water slurry undergoes a series of complex physical and chemical processes such as preheating, water evaporation, coal dry distillation, volatile cracking and combustion, and carbon gasification. Therefore, in addition to high temperature (1250~1400℃), high pressure (4~8.5MPa) and strong reducing atmosphere, the refractory lining of coal water slurry gasifier is also corroded by acidic coal slag. [0003] At present, high ...

AI Technical Summary

Problems solved by technology

The content of chromium oxide in the above-mentioned patented technologies is relatively high, and it may produce highly harmful hexavalent chromium ions in the process of production, use or recycling, and a large amount of use will inevitably pollute the environment and threaten human health

"Fused magnesia-aluminum spinel bricks for coal-water slurry gasifier and its preparation method" (201210100108.9) The patented technology adopts fused-cast magnesia-aluminum spinel bricks, which realizes the non-woven lining material of coal-water slurry gasifier Chromizing, but can not be used in coal-water slurry gasifier cone bottom and other parts, the reason is that there are the following disadvantages: the melting and casting process not only consumes a lot of energy, but also consumes a lot of abrasive tools, and the material structure uniformity and grain size in the preparation process High control requirements, easy to crack during cooling, and insufficient thermal shock stability