Detailed Explanation of Blast Furnace Pulverized Coal Injection Tank (Pulverized Coal Injection Vessel)
Detailed Explanation of Blast Furnace Injection Vessel (Pulverized Coal Injection Vessel)
The injection vessel (also known as the pulverized coal injection vessel) is the core pressure vessel of the blast furnace pulverized coal injection system, undertaking the functions of pulverized coal storage, pressurization, fluidization and quantitative conveying. Its design and operation directly determine the stability and safety of the pulverized coal injection system. This article will provide a comprehensive introduction from aspects such as structural composition, classification methods, working principles, key design points and application characteristics.
I. Basic Structure and Equipment Attributes of the Injection Vessel
(I) Core Components
As a typical internal pressure vessel, the structural design of the injection vessel must comply with pressure vessel safety specifications. It is mainly composed of the following components:
| Component Name | Function |
|---|---|
| Elliptical / Dished Head | A standard head form for vessel body manufacturing, which withstands internal pressure and disperses stress. It is more pressure-resistant and material-saving than a flat head |
| Circular Straight Section | The main part of the vessel body, providing space for pulverized coal storage. The straight cylinder structure is easy to process and weld |
| Tapered Lower Head | Guides pulverized coal to concentrate at the bottom, cooperates with the fluidization device to achieve uniform output of pulverized coal, and avoids pulverized coal accumulation |
| Support | Supports the weight of the vessel body, fixes the position of the vessel body, and ensures stable installation of the vessel body |
| Manhole | A passage for personnel to enter the vessel for maintenance and cleaning. Equipped with a sealing cover to ensure the airtightness of the vessel |
| Safety Pressure Relief Device | A safety pressure relief device that automatically ruptures to release pressure when the internal pressure of the vessel exceeds the design limit |
(II) Supporting System Equipment
The injection vessel needs to work in coordination with the following equipment to form a complete pulverized coal conveying system:
- Bell Valve: Installed at the inlet and outlet of the vessel body, controlling the loading and discharging of pulverized coal. It has the characteristics of good sealing and reliable opening and closing.
- Fluidization Device: Including a fluidized bed (at the bottom of the vessel) and a fluidization nozzle (at the tapered section. By introducing compressed air, pulverized coal is in a "fluidized" state, which is convenient for conveying.
- Self-Mixer: Introduces secondary compressed air to enhance the mixing effect of pulverized coal and air flow, ensuring stable conveying of pulverized coal to the lance.
- Pressure Equalization and Relief Device: Mainly used in tandem vessel arrangements to balance the pressure of the upper and lower vessels, realizing safe and rapid vessel switching.
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