Preparation method and masonry method of a slag port in the lower part of a gasifier with a mark

Abstract

Relating to the technical field of refractory materials for coal chemical industry, the invention provides a preparation method and building method for a marked gasification furnace lower cinder notch. The method specifically includes the operation steps of: 1) material preparation: the marked gasification furnace lower cinder notch comprises, by mass, 79-90% of fused chromium oxide materials with a particle size of 5-0mm and 240 meshes respectively, 2-15% of an alumina micro-powder material with a particle size of 5-2 micrometers, 2-15% of chromium oxide green, 1-3% of a magnesium material with a particle size of less than 180 meshes, 1-3% of steel fiber and organic fiber, and 1-5% of a binding agent; 2) compounding; 3) premixing; and 4) material mixing, thus finishing preparation of the marked gasification furnace lower cinder notch. According to the invention, the magnesium material reacts with the acid binding agent and hardens rapidly, and when the temperature in the gasification furnace rises to certain degree, the magnesium material, chromium oxide and alumina form spinel so as to enhance the heat shock stability of the material, and the fireside surface refractory material of the lower cinder notch is easy to dismantle and replace.

Description

[0001] [Technical Field] The present invention belongs to the technical field of refractory materials for coal chemical industry, and relates to a preparation method and a masonry method for a marked slag port refractory lining at the lower part of a gasifier. [0002] 【Background technique】 [0003] As is known, the refractory material facing the fire surface at the slag mouth of the coal-water slurry pressurized gasification furnace is chrome-aluminum-zirconium brick, which is formed by machine pressing and then fired at a high temperature of 1700°C. The structure of the refractory material facing the fire surface at the slag mouth is two to There are three layers of refractory bricks with a large inner diameter, one or two layers of refractory bricks in the upper part and a smaller inner diameter of a trumpet shape, and the upper part of the slag mouth facing the fire surface. The main function of the refractory material is to withstand the physical erosion and chemical erosio...

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Problems solved by technology

[0004] Due to the short service life of refractory bricks at the upper part of the slag mouth, generally about 4000 hours, the refractory materials at the slag mouth need to be replaced frequently, so the length of time for replacing the refractory materials at the slag mouth restricts the length of time for the gasifier to be shut down for maintenance; the lower part of the slag mouth The machine-pressed high-temperature fired chrome-aluminum-zirconium bricks have the problem that it takes a long time to dismantle and masonry installation. At the same time, because it mainly plays a structural support role, the use of chrome-aluminum-zirconium bricks in the lower part of the slag mouth has serious excess performance. In addition, there is chilled water at the lower part of the slag hole to cool the slag hole, so the temperature indication of the external thermocouple cannot be used to judge the thickness of the remaining bricks and whether the furnace should be shut down to replace the slag hole bricks, which often causes gas Brick plates, chilling rings and downcomers in the furnace are damaged, which increases the equipment failure rate and maintenance time; with the development of the coal chemical industry, the number of coal-water slurry pressurized gasifiers has increased sharply, and objectively it needs to be easier to dismantle And replace the lower part of the slag mouth to the fire surface refractory material, and at the same time can effectively indicate the node to replace the slag mouth brick, so as to protect the gasification equipment

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