Technical Characteristics, Operation and Maintenance, and Fault Analysis of Blast Furnace Pulverized Coal Lance (Coal Injection Lance)
Technical Characteristics, Operation & Maintenance, and Failure Analysis of Blast Furnace Pulverized Coal Lances
The blast furnace pulverized coal lance is the core equipment for realizing the blast furnace coal injection process, and its performance and stability directly determine the coal injection volume, pulverized coal combustion efficiency, and the continuity of blast furnace production. This article will provide a detailed explanation from aspects such as process characteristics, product types, operation & maintenance, and failure analysis.
I. Core Value of Pulverized Coal Lances
In the blast furnace ironmaking process, stabilizing and increasing the coal injection volume is a key way to reduce the coke ratio, save energy, and control production costs. High-quality pulverized coal lances can not only extend their own service life, but also provide core equipment support for realizing the advanced ironmaking process of "high blast temperature, oxygen enrichment, and large injection volume" by protecting the tuyeres and reducing unplanned blast furnace shutdowns.
II. Process Characteristics and Operational Characteristics of Pulverized Coal Lances
(1) 2520 Heat-Resistant Steel Ceramic Liner Lance (Mainstream High-Performance Model)
This type of lance is designed for the harsh working conditions of high temperature and high wear in blast furnaces, and is currently a widely used high-performance lance. Its core advantages lie in material and structural innovation:
1. Process Characteristics
- Main Body Material: The lance body is made of 2520 heat-resistant steel (i.e., 06Cr25Ni20 austenitic stainless steel), which has excellent high-temperature oxidation resistance (can withstand temperatures above 800℃ for a long time) and corrosion resistance, adapting to the high-temperature environment in the blast furnace straight blowpipe.
- Wear Resistance Enhancement: Adopts the process of "local ceramic lining on the inner wall of the steel pipe", lining alumina or silicon carbide ceramics in the lance tip and front section areas where pulverized coal scouring is most severe, which improves the wear resistance by 3 to 5 times and greatly extends the overall service life of the lance.
2. Operational Characteristics
- Low Replacement Rate: The composite structure of heat-resistant steel + ceramic liner significantly reduces the risk of wear and burn damage, reduces downtime caused by frequent replacements, and eases the labor intensity of workers during disassembly and assembly.
- High Production Stability: The lance body has high strength and small deformation, can maintain a stable lance position and coal injection angle for a long time, avoids uneven injection caused by lance bending, reduces blast furnace shutdown times, and improves production efficiency.
- Supports Large Injection Volume: The stable structure and wear resistance can adapt to the demand for high coal ratio injection, provide equipment guarantee for the blast furnace to achieve "replacing coke with coal", and directly reduce ironmaking costs.
- Repairability: For minor damage in non-core areas, it can be repaired through local welding, ceramic patching, etc., further extending the overall service life and reducing equipment investment costs.
| Hardware & Tools/Cutting Power Tools/Spray Guns | |
