Tuyere Stock Assembly, PCI Lance & Above Burden Probe
Tuyere stocks are critical mechanical links that transport hot blast air (reaching temperatures between 1000°C and 1200°C) from the blast furnace bustle main into the furnace tuyeres. Because of the thermal expansion and high internal gas pressure, these assemblies require high structural rigidity combined with multi-directional expansion joints.
Excellors designs and manufactures premium, refractory-lined tuyere stock assemblies. In addition, we design and fabricate **PCI Lances** (Pulverized Coal Injection Lances) which are an important part of the Tuyere stock assembly, used to blow hot air and coal from the hot blast main to the blast furnace at optimum flow velocity. We also manufacture custom Above Burden Probes for gas and temperature sensing inside the blast furnace, ranging from simple to high-end designs.
Key Technical Specifications
- Refractory Insulation Layer: High-alumina lining minimizing outer shell temperature to under 120°C.
- Thermal Expansion Compensation: Stainless steel bellows absorbing axial and lateral displacements.
- PCI Lance Parameters: Design pressure 0.3MPa–0.65MPa, Design Temp: 1350°C, suitable for 450m³–5500m³ Blast Furnaces.
- Above Burden Probe: Gas and temperature sensor layout, customized from simple designs to high-end instrumentation.
- Water-Cooled Seals: Precision milled flange seats preventing combustion gas blowback.
- Universal Alignment Hinges: Malleable link adjusters for simple alignment during furnace shutdowns.
Project Achievements
Scope: Completed manufacturing and NDT weld clearance for a batch of replacement tuyere stocks for a major 3200m³ blast furnace facility.
Result: Outer steel shell temperature tests during hot operations showed a 15% reduction in heat radiation compared to the customer's previous design, improving surrounding workplace safety and extending bellow lifespan.