Dense clay bricks

At present, most design institutes and manufacturers still take a cautious wait-and-see attitude towards complex nitride combined silicon carbide bricks when selecting refractory materials. The main reason is that the cost of using complex nitride combined silicon carbide bricks will be much higher than that of mullite- Silicon carbide bricks. When considering the cost of materials, only considering the purchase price of the product is one-sided, and the overall cost of the entire life cycle of the product should be taken into account and play a decisive role. Based on the concept of "lower product life cycle cost", taking the 140t/h CDQ coke oven as an example, the cost of using different refractory materials in the chute area is calculated as follows.

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Refractories for dry quenching coke ovens

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Cost comparison of different options for refractory materials

1 Material cost comparison

Although the unit price of composite nitride-bonded silicon carbide bricks is 60% higher than that of mullite-silicon carbide bricks, due to the long service life of the products, the total cost of refractories during the 5-year service period is higher than that of mullite-silicon carbide bricks. low. When calculating this cost, only the price per ton of refractory materials and the amount of refractory materials are considered, and the loss of production efficiency, maintenance and construction costs and oven costs caused by the shutdown of maintenance and construction have not been included. If the full cost is calculated, the use of complex nitrides combined with silicon carbide bricks will produce greater economic benefits than the use of mullite-silicon carbide bricks.

2 Other aspects of comparison

The CDQ rate and annual power generation can be greatly improved after the CDQ oven chute area is transformed by using complex nitrides combined with silicon carbide bricks. In addition, due to the reduction of the number of shutdowns of the CDQ, the impact on the blast furnace caused by frequent switching of dry and wet coke is reduced. At the same time, due to the shortening of maintenance time and the improvement of CDQ rate, the fuel consumption of the blast furnace is reduced, which is beneficial to the long-term stable production of the blast furnace.

Physical and chemical indicators

Main physical and chemical indexes of dense clay brick (N53) for CDQ

Project	Index
Al₂0₃，%≥	42
Fe₂0₃，≤	1.2
Refractoriness，℃ ≥	1750
Normal temperature compressive strength，MPa ≥	55
Volume density，g/cm³ ≥	2.3
Apparent porosity，% ≤	19

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Clay bricks carbonization Refractory

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AT & BT mullite carborundum bricks for dry quenching

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Dense clay bricks

Main physical and chemical indexes of dense clay brick (N53) for CDQ