Plugging brick for top opening of water-coal slurry gasification furnace and preparation process thereof

Abstract

The invention relates to a plugging brick for the top opening of a water-coal slurry gasification furnace and a preparation process thereof. The plugging brick comprises 60-70% of 0-5-millimeter particles of fused chromium oxide, 10-20% of 180-mesh fine powder of fused chromium oxide, 8-13% of 200-mesh chromium oxide green, 1-8% of 200-mesh fine powder of zirconium oxide and 3-8% of 1,000-mesh micro powder of active alpha-alumina, and the plugging brick further comprises 1-2% of micro powder of active rho-alumina, 0.15-0.25% of a compound additive in which the ratio of calcium lignosulphonate to polycarboxylic acid is 1:2 and 3-4% of solution of aluminium dihydrogen phosphate, wherein the specific surface area of the micro powder of active rho-alumina is 200m<2> / g, and the specific gravity of the solution of aluminium dihydrogen phosphate is more than or equal to 1.85. The preparation process of the plugging brick comprises the following steps: premixing fine powder, mixing aggregates, ageing, molding, drying, sintering, assembling and processing. The plugging brick has high compressive strength and excellent corrosion and erosion resistance, is reusable, basically has the same volume as a plugging brick which has a high content of chromium of 90% and is used for the top opening of a water-coal slurry gasification furnace and is beneficial to prolonging the service life of the top opening of a water-coal slurry gasification furnace and keeping the top opening of a water-coal slurry gasification furnace intact.

Description

technical field [0001] The invention belongs to refractory materials, and in particular relates to a top plugging brick of a coal-water slurry gasification furnace and a preparation process thereof. Background technique [0002] Crude oil resources have already occupied an important strategic position in a country, but the price of crude oil in the world today remains high, and scientific researchers from various countries have been developing alternative products. Coal-water slurry gasification technology using relatively cheap coal as the main raw material to produce oil, gas, ethylene, acetic acid, methanol, synthetic ammonia, etc. has become a hot research field, especially in my country, where crude oil resources are insufficient, but coal reserves are very rich. Therefore, coal-water slurry gasification technology is particularly important in our country. This technology can make full use of coal resources, is energy-saving and environmentally friendly, and has broad ...

AI Technical Summary

Problems solved by technology

The sintering process is not only accompanied by a large volume change, which does not match the size of the furnace mouth, but also adheres to and sinters with the surrounding vault chrome 90 bricks, which makes it difficult to pull out the blocking bricks when the gasifier is shut down. Pull off the half, then smash the remaining half with a pickaxe and drop it into the furnace

It is easy to damage the surrounding vault bricks in the process of breaking the remaining half-blocking bricks, resulting in a reduction in the service life of the vault bricks

In addition, prefabricated blocking bricks or cast blocking bricks need to be preheated before use to prevent them from being directly inserted into the furnace mouth from a cold state and bursting, which is more cumbersome to use

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