This article's table of contents introduction:
- What does "SWSI" mean?
- Why "Stainless Steel"?
- Primary Applications (Coal Gas Boosting & Conveying Ventilation)
- Key Design & Technical Features
- Typical Technical Specifications (Example)
- Why Choose This Type of Blower?
- Potential Manufacturers or Standards
The term "SWSI Stainless Steel Blower Coal Gas Boosting And Conveying Ventilation" refers to a highly specialized industrial fan system designed for handling potentially hazardous and corrosive gases in coal gasification, steel manufacturing, and chemical plants.
Here is a detailed breakdown of what this equipment is, its key features, and its applications.
What does "SWSI" mean?
- SWSI stands for Single Width, Single Inlet.
- This is a standard centrifugal fan configuration where air enters the impeller from one side only (single inlet) and the impeller has a single set of blades (single width).
- This design is ideal for high-pressure applications like boosting and conveying, offering good efficiency and a compact footprint.
Why "Stainless Steel"?
This is the most critical material specification for this application.
- Corrosion Resistance: Coal gas contains sulfur compounds (H₂S), ammonia, and other corrosive agents. Standard carbon steel fans would rust and fail quickly. Stainless Steel (typically 304, 316, or 316L) provides the necessary resistance.
- Spark Resistance: In environments with combustible gases, stainless steel is preferred because it is non-sparking when struck by foreign objects, reducing the risk of ignition.
- Wear Resistance: While not as hard as some alloys, stainless steel offers better structural integrity when handling gas with fine coal dust or particulates.
Primary Applications (Coal Gas Boosting & Conveying Ventilation)
The name itself describes the three core functions:
A. Coal Gas Boosting
- Function: Increasing the pressure of coal gas (syngas, coke oven gas, or blast furnace gas) to overcome pipeline resistance and ensure it flows to its destination (e.g., a boiler, furnace, or storage unit).
- Why needed: Downstream processes require a specific pressure range that the gasifier or producer cannot provide alone.
B. Conveying (Pneumatic)
- Function: Using the high-velocity air/gas stream to transport solid materials (e.g., coal dust, ash, or biomass) through pipes.
- Key Feature: The fan must be robust enough to handle the abrasion from solid particles and the density of the gas-solid mixture.
C. Ventilation
- Function: Providing forced ventilation in hazardous areas (e.g., coal gas cleaning rooms, process buildings) to dilute and remove explosive or toxic gas leaks.
- Safety: Explosion-proof construction is mandatory.
Key Design & Technical Features
| Feature | Specification & Purpose |
|---|---|
| Impeller Type | Backward-curved or radial blades. Backward-curved for efficiency; radial for handling dusty/dirty gas. |
| Material | SS304 (general corrosion) or SS316/316L (higher resistance to chlorides & acids). |
| Seal | Gas-tight mechanical seals or labyrinth seals to prevent toxic/ex-plosive gas leakage into the atmosphere. |
| Explosion Proof (EX) Motor | Mandatory. ATEX, IECEx, or NEC certified motor to prevent electrical sparks from igniting coal gas. |
| High Temperature Rating | Designed for gas temperatures up to 250°C - 400°C (depending on gas source). |
| Variable Speed Drive (VSD) | Common for precise pressure and flow control during boosting. |
Typical Technical Specifications (Example)
- Flow Rate: 5,000 to 150,000 m³/h (depending on conveyor line size)
- Pressure Rise: 500 to 10,000 Pa (for boosting)
- Motor Power: 7.5 kW to 500 kW
- Gas Type: Coke Oven Gas, Blast Furnace Gas, Syngas, Landfill Gas
- Temperature Range: Ambient up to 300°C
Why Choose This Type of Blower?
- Safety: Gas-tight construction prevents dangerous gas leaks.
- Durability: Stainless steel resists corrosion from acidic gas components (H₂S, CO₂).
- Efficiency: Centrifugal SWSI design provides high pressure at relatively good efficiency.
- Low Maintenance: Robust construction reduces downtime in harsh environments.
Potential Manufacturers or Standards
Look for specialized industrial fan manufacturers that comply with:
- ISO 1940 (Balance quality)
- EN 12101-3 (Safety for smoke/ventilation)
- API 673 (For refinery/petrochemical fans)
- ATEX / IECEx (Explosion proof certification)
Note: If you are looking for a specific product quote, you would need to contact a manufacturer like New York Blower, Howden, Twin City Fan, or a specialized Chinese manufacturer (e.g., from Zibo or Shangyu area) that produces stainless steel SWSI fans for coal gas applications. Provide them with the gas composition and temperature to select the correct stainless steel grade (e.g., 316L vs. 329).
