Preparation method of heat insulation tile with complex shape for combustion chamber of gas turbine

Abstract

The invention discloses a preparation method of a heat insulation tile block with a complex shape for a combustion chamber of a gas turbine. The casting molding mode is adopted, the silica sol and the solid aluminum formate flocculant are used as a combination system, no impurity is introduced in the molding process, the fluidity is good, and uniform molding of the heat insulation tile in the complex shape is achieved. The preparation process provided by the invention has no special requirements on equipment, the demolding period is short, the green body strength is high, demolding and green body processing are convenient, and the prepared corundum-mullite heat insulation tile has the characteristics of high purity, high temperature resistance, good thermal shock stability, excellent mechanical properties and the like.

Description

technical field [0001] The invention relates to a method for preparing a refractory material, in particular to a method for preparing a complex-shaped heat-insulating tile for a combustion chamber of a gas turbine. Background technique [0002] Gas turbines can be widely used in many fields such as electric power, ships, aviation, etc., and especially play an indispensable role in the energy and power industry. The internal temperature of the combustion chamber of the gas turbine is as high as 1600°C during use. In order to avoid the ablation and erosion of high-temperature hot gas, the lining of the combustion chamber is made of high-temperature resistant ceramic insulation tiles. The heat insulation tile is fixed on the metal casing of the combustion chamber through a metal suspension system. In order to further protect the metal parts in the casing, a cooling system is used on the back of the ceramic heat insulation tile. Therefore, thermal insulation tiles not only need...

AI Technical Summary

Problems solved by technology

Due to the complex shape of the heat insulation tile, the pressure conduction is limited in a local area during molding, resulting in poor uniformity of the heat insulation tile and affecting its thermal shock stability.

Casting molding has more advantages in terms of uniformity and performance. However, due to the requirements of material composition and high-temperature performance under the harsh working conditions of thermal insulation tiles, impurities other than silicon oxide and alumina cannot be introduced. The choice of binding system is more limited

The calcium aluminate cement used in traditional casting molding cannot be used because it contains calcium oxide, and the organic binding system (such as Isobam in patent CN111892392A, xanthan gum, guar bean powder and other polysaccharide binders in patent CN103732560A) has a curing time Long, complex curing process, and low green strength in the silica sol bonding system

[0004] The existing heat insulation tile molding process has the following problems: it is difficult to ensure the uniformity of the complex-shaped green body in compression molding, which affects the performance of the tile; there are impurities introduced by the binder during casting molding, which affect the high-temperature performance or the curing control is difficult. A series of problems such as low green strength

Images