In order to stabilize the combustion, the original design uses light oil as the duty fuel, in the transformation of Shaoguan Iron and Steel Co., Ltd. to coke oven gas as duty fuel, while a small range of speed adjustment. Analyze the causes of ablative damage: Due to the long-term high temperature environment of metal materials, corrosive gas components are contained in the fuel, causing intergranular corrosion in the cones and other parts.
The causes of burning are based on the results of the crystal phase analysis. Combining with the characteristics of the combustion chamber, a certain amount of coke oven gas is blended into the blast furnace gas for the purpose of stabilizing the fuel heating value in Handan Iron and Steel Co. Due to the high content of H2 in the coke oven gas, H2 burns at the cone top of the burner, causing over temperature in the cone shell, causing intergranular corrosion and burning.
In addition, the temperature difference of the cylinder steel hanging pieces is poor, and when the cooling is poor in some parts of the cylinder body, burning damage is caused, and then the ablated parts of the ablated parts are burned and damaged, which causes deterioration of the work environment between the surrounding heat insulating steel structures. The intercrystalline corrosion of the entire thermal insulator deteriorates physical and chemical properties, resulting in damage to the steel shell. Repair remodeling is aimed at the cause of the damage, and replacement of the cone shell is taken. For the cylinder hanging piece according to the inspection of foreign gas turbine maintenance information, due to the short life of the steel insulation hanging piece, poor insulation effect, decided to replace with firebrick.
Combustion chamber conical shell, cylinder working characteristics Gas turbine combustion chamber conical shell, cylinder metal components have the following characteristics: (1) high temperature, temperature should reach 800 °C; (2) corrosion resistance, due to the gas in the blast furnace gas Contains a variety of corrosive gases. The key to the repair of the conical shell of the combustion chamber and the selection of conical shells and cylinders of the cylinder is the selection of materials. Through the testing of the metal materials and the characteristics of the working conditions of the combustion chamber, it was determined that the entire conical shell and the metal of the cylinder are made of 1Cr18Ni9Ti. To meet the requirements, the price is relatively cheap, through the cooperation with a machine repair factory produced a combustor burner cone and shell and other key components.
The firebrick shall have the following working characteristics (1) high temperature resistance, flame temperature of the combustion chamber burner at 1200°C; (2) high strength and good resistance to high-speed flame erosion; (3) slight expansion due to the circumferential arrangement of the refractory bricks, The distance between bricks and bricks is 1mm. Excessive expansion will cause the bricks to be damaged by extrusion. The material selection and installation process of refractory bricks has no relevant technical information due to damaged parts. According to the requirements for the characteristics of the above repaired components, in September 2003, in cooperation with a Refractory Co., Ltd., we developed and produced a combustor-resistant, high-temperature resistant, shaped brick.
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