You are here:Home / News / Technical Information / Application analysis and material selection of refractory materials for CDQ furnace
Application analysis and material selection of refractory materials for CDQ furnace
Views: 57 Author: Site Editor Publish Time: 2020-09-25 Origin: Site
Structural characteristics of CDQ furnace
The main equipment of CDQ is dry quenching furnace masonry, which is cylindrical vertical masonry in positive pressure state. The outer surface of CDQ furnace is surrounded by metal shell, and the inner layer is made of different refractory products. The coke enters the cooling zone from the upper cone of the pre-storage room due to its self weight. The inert gas exchanges heat with the red coke in the cooling zone, and the thermal circulating gas enters the annular air duct from the ramps zone. After entering the primary dust removal chamber, the coke enters the boiler for heat exchange with boiler water to generate steam.
Due to the temperature fluctuation before and after coke charging, the upper cone of the pre-storage room has higher requirements for the thermal stability of the refractory brick masonry. The middle part of the pre storage section is a straight section solid refractory masonry, which mainly bears the thermal expansion after loading red coke and the impact and wear of coke. The lower part of the pre-storage room is an annular air duct, which is divided into two ring masonry of inner wall and outer wall, and the inner wall should bear coke loading Carbon impact and wear, but also to prevent the pre-storage room and annular flue due to the pressure difference caused by the leakage phenomenon.
The ramps zone is the key part of the load-bearing structure of the CDQ furnace. The temperature in the area fluctuates frequently, and the coke entrained by the circulating gas washes the part violently. Therefore, the requirements for the thermal shock stability, wear resistance and bending resistance of the bricks in the ramps zone are very high.
The refractory masonry in the inner wall of cooling zone is mainly subjected to the abrasion of coke falling and moving and the impact of frequent fluctuation of working temperature.
The 1 Dust Catching adopts gravity dedusting method to collect coarse-grained coke powder mixed in the circulating gas from the Annular duct area of CDQ furnace. The arch masonry structure is adopted for the refractory brick at the top of 1 Dust Catching, and the conical bucket structure is constructed by refractory bricks at both sides and bottom parts.
Performance analysis of refractory material for CDQ furnace
CDQ Furnace Parts
Work Environment
Performance Requirements of Refractory Materials
Upper Cone
Temperature variations
Wear heavily
Excellent thermal shock stability
Wear-resisting
Pre-storage Room
High temperature thermal expansion
Wear from coke
Wear heavily
High temperature resistance
low thermal expansion
Wear-resisting
Ramps Zone
Bearing the upper masonry load
Temperature changes frequently
Circulating gas scour
Wear of coke dust
High CMOR
Excellent thermal shock stability
Erosion resistance
Wear-resisting
Cooling Zone
The largest wear from coke
Temperature changes frequently
High Wear-resisting
Wear-resisting
1 Dust Catching (1DC)
Top arch masonry: temperature changes frequently
Conical bucket masonry on both sides: wear heavily
Conical bucket masonry at the bottom parts: Large scour