Coke CDQ Refractory Brick

As the biggest energy-saving technology in the ironmaking system, dry coke quenching has the advantages of fully reducing environmental pollution, recovering the sensible heat of red coke, and improving the quality of coke compared to the traditional wet coke quenching. The refractory materials for dry coke quenching ovens are as follows:
1. Commonly used refractory materials for CDQ coke oven
The CDQ furnace masonry is of vertical kiln structure, and the furnace body can be divided into pre-storage chamber, ramp area, cooling chamber and primary dust removal device from top to bottom.
2. Limitations of commonly used refractory materials
The ramp area of the CDQ coke oven uses mullite bricks and mullite-silicon carbide bricks. Mullite bricks and mullite-silicon carbide bricks have good thermal shock stability, wear resistance, high flexural strength and corrosion resistance.

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Description

Refractory bricks for CDQ

3.4.1 Cooling section: Class B mullite bricks QBM

3.4.2 Inclined area: Class A mullite-silicon carbide QAT

3.4.3 Pre-storage section, upper part of dust collector, partition wall: Class A mullite bricks QAM

3.4.4 Cone furnace mouth: Class B mullite-silicon carbide bricks QBT

3.4.5 Upper part of pre-storage section, lower part of dust collector: QN53 dense clay bricks

3.4.6 Permanent layer, loading belt: QN3

The dry quenching furnace consists of a pre-storage chamber, a ramp area and a cooling chamber. They are respectively distributed in the upper, middle and lower parts of the dry quenching furnace. The dry quenching furnace is a vertical trough with a circular cross-section. The outer shell is made of steel plates and steel sections, and the inner layer is built with different refractory bricks. Some parts are made of refractory castables.

The upper part of the pre-storage chamber is the cone top area, the middle part is a straight section of solid refractory brick masonry, and the lower part is a circular flue. It is divided into two layers of circular masonry, the inner wall and the outer wall, and the inner wall requires high-strength refractory bricks.

The requirements for the inner bricks in the ramp area are: thermal shock resistance, high strength, and wear resistance. For this reason, mullite-SiC bricks are selected. The same is true for the refractory bricks at the entrance of the dry quenching furnace.

Products Description

The refractory bricks in the pre-storage room of the dry quenching furnace have a large thermal shock. The mechanical impact and wear of loading coke require high-strength, wear-resistant, and thermally shock-resistant refractory materials, such as mullite bricks; the cooling room has frequent temperature changes, so good thermal shock resistance is the most basic requirement for refractory materials.

In the working environment of the dry quenching furnace for dry quenching coke, the refractory materials should have the following excellent characteristics:

(1) Thermal shock resistance.

(2) Wear resistance and high strength (compressive strength, flexural strength).

Technical indicators of refractory materials for CDQ

project	HX-AM	HX-BM	HX-AT	HX-BT	HX-N53	HX-N3
Al2O3 % ≥	55	55	35	30	42	-
SiO2 % ≥	-	-	30	40	-	-
Fe2O3 % ≤	1.3	1.3	1.0	2	1.5	-
1100℃×0.5h Flexural strength MPa ≥	10	18	20	20	-	-
Load softening degree /℃ ≥	1500	1550	1600	1600	1500	1450
Thermal shock (1100℃, water cooling)/time ≥	30	22	40	50	10	-
Compressive strength/MPa ≥	75	85	85	85	70	25
Apparent porosity % ≤	18	17	21	21	15	24
Bulk density (g/cm³) ≥	2.4	2.45	2.5	2.5	2.3	-
Refractoriness ℃ ≥	1770	1770	1770	1770	1770	1690
Reburning line change rate (1350℃×2h) %	+0.1～-0.5	+0.1～-0.5	+0.1～-0.5	+0.1～-0.5	+0.1～-0.5	+0.1～-0.5

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