| Customization: | Available |
|---|---|
| Condition: | New |
| Automation: | Automatic |
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From June 23 to 25, 2023, Mr. Lan Xingming, General Manager of Xi'an Brictec Engineering Co., Ltd., visited the site of the Najmadin 750 TPD brick factory project in Iraq for inspection and assessment.
Project Location:
Near Chamchamal, Sulaymaniyah Province, Iraq, close to the highway between Chamchamal and Sulaimani cities.
Project Overview:
The Najmadin company's brick plant has a daily production capacity of 750 tons.
Main Product Specifications:
400×200×200mm (primary product)
200×400×400mm (secondary product)
Additional Products:
200×200mm hollow bricks (producible with existing factory equipment)
Aging and Forming Process:
Aging:
A closed aging chamber maintains humidity above 80% to promote ion exchange in the clay.
Extrusion Forming:
A vacuum extruder with a vacuum level of ≥ -0.092 MPa improves the density of the green body.
Mold Design:
A die length-to-diameter ratio of ≥ 4:1 reduces spiral marks, and chrome-plated lips lower friction.
Segmented Drying:
Preheating Stage (40-60°C, humidity ~70%) to prevent cracking.
Rapid Drying Stage (80-120°C) to remove bound water.
Airflow Management:
Vertical air supply prevents a temperature difference of more than 5°C between the top and bottom of the brick stack.
Waste Heat Utilization:
Excess heat from the cooling zone of the tunnel kiln is redirected into the drying chamber.
Drying Process:
Drying is the most critical stage before sintering and requires careful control:
Segmented Drying:
Preheating Stage (40-60°C, humidity ~70%) to prevent cracking.
Rapid Drying Stage (80-120°C) to remove bound water.
Airflow Management:
Vertical air supply prevents a temperature difference of more than 5°C between the top and bottom of the brick stack.
Waste Heat Utilization:
Excess heat from the cooling zone of the tunnel kiln is redirected into the drying chamber.
Tunnel Kiln Firing Curve Process:
The firing curve directly affects the strength of the bricks and fuel consumption:
Preheating Zone (200-600°C):
Temperature rise should be ≤50°C per hour to prevent cracking.
Firing Zone (900-1050°C):
Maintain temperature for 2-4 hours in an oxidizing atmosphere to ensure proper sintering.
Cooling Zone:
Gradual cooling to below 80°C; excessively rapid cooling may cause fractures in the glassy phase.
Brictec's Core Philosophy on Tunnel Kilns
At Brictec, we regard the tunnel kiln as the "heart" of clay sintered brick production. Every kiln we design and build embodies our clients' core demands for product quality and energy efficiency. We are committed to the following principles:
Strict Refractory Standards:
The kiln walls are lined with high-load soft firebricks containing ≥60% alumina (refractoriness >1750°C), while the kiln roof adopts a lightweight composite insulation structure to maximize thermal efficiency.
Millimeter-Level Construction Precision:
Kiln body straightness deviation is controlled within <3 mm per 10 meters, eliminating temperature drift and color inconsistency caused by kiln deformation.
Dynamic Thermal Verification:
We use CFD (Computational Fluid Dynamics) simulation combined with full-scale thermal testing to optimize the stability of the firing curve.
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