Technical Characteristics, Operation and Maintenance, and Fault Analysis of Blast Furnace Pulverized Coal Lance (Coal Lance)
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Technical Characteristics, Operation and Maintenance, and Fault Analysis of Blast Furnace Pulverized Coal Lances
The blast furnace pulverized coal lance is core equipment for realizing the blast furnace pulverized coal injection process. Its performance and stability directly determine the pulverized coal injection rate, 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 and maintenance, and fault analysis.
I. Core Value of Pulverized Coal Lances
In the blast furnace ironmaking process, stabilizing and increasing the pulverized coal injection rate 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 protect the tuyeres and reduce unplanned blast furnace shutdowns, providing core equipment support for realizing the advanced ironmaking processes of "high blast temperature, oxygen enrichment, and large-scale injection".
II. Process Characteristics and Operational Characteristics of Pulverized Coal Lances
(1) 2520 Heat-Resistant Steel Ceramic-Lined 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 are reflected in material and structural innovations:
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°C for a long time) and corrosion resistance, adapting to the high-temperature environment in the blast furnace direct blowing pipe.
- Wear Resistance Enhancement: Adopts the "local ceramic lining on the inner wall of the steel pipe" process. Alumina or silicon carbide ceramics are lined in the lance head 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 and ceramic lining 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 pulverized coal injection angle for a long time, avoids uneven injection caused by lance body bending, reduces the number of blast furnace shutdowns, and improves production efficiency.
- Supports Large Injection Volume: The stable structure and wear resistance can adapt to the demand for high coal ratio injection, providing equipment guarantee for the blast furnace to achieve "replacing coke with coal" and directly reducing 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.
| Industry Category | Hardware & Tools/Cutting Power Tools/Spray Guns |
|---|---|
| Product Category | |
| Brand: | 翔业 |
| Spec: | DN20喷煤枪|长1700mm |
| Stock: | 10000 |
| Manufacturer: | 翔业（日照）环保设备有限公司 |
| Origin: | 113711 |
