Pulverized coal lance may experience the following issues during use: 1. The defective area is clearly formed from the inside out, with signs of erosion. This is mainly due to quality issues with the lance barrel, such as cracks or folds. If the barrel is welded and the defect is around the weld, it may be caused by welding defects like misalignment, internal weld nodules, or inherent weld flaws. 2. "Flowering" at the head: This occurs at the front end of the lance, where pulverized coal is visibly scattered at the nozzle.

       This situation is mostly caused by inserting the lance too deeply. The insertion position is determined by the tuyere, straight blowpipe structure, lance design, and furnace conditions. Inserting too deep can cause the lance head to burn and "flower," while inserting too shallow may lead to erosion and damage to the tuyere nozzle. Therefore, a reasonable insertion position must be chosen. Additionally, the selection of materials for the lance barrel, especially the head, is crucial. Higher resistance to high-temperature oxidation extends the lance's service life. The occurrence of the above issues can affect the lance's lifespan and performance. Hence, attention must be paid to preventing and resolving these problems during use. When the material's wear resistance is better, under the same operating conditions, defects may appear later or even not manifest within one cycle. This phenomenon is known as fatigue damage.

    Lanhao Environmental Protection's pulverized coal injection system includes various equipment, such as coal powder distributors, coal powder filters, fluidizers, fluidizing plates, point fluidizers, boiling mixers, vent filters, ball valves, coal injection pipes, regulators, flue gas drying furnaces, check valves, wood chip separators, injection tanks, tank conveying pumps, air (nitrogen) heaters, and coal injection machines.

I. Process characteristics of pulverized coal lance:

1. The lance body is made of 2520 heat-resistant steel.

2. The lance features advanced technology with localized ceramic lining inside the steel pipe.

II. Usage characteristics of pulverized coal lance:

1. Long service life and low replacement rate, reducing workers' labor intensity.

2. Stable lance position, reducing blast furnace downtime and improving productivity.

3. Stable and increased coal injection volume, enabling large-scale injection and reducing ironmaking costs.

4. Repairable, extending the overall service life of the lance.