Limestone Injection System for CFB Coal Boiler
Product Overview
Our limestone injection system for CFB coal boiler is engineered to deliver precise, continuous limestone dosing into the furnace zone of circulating fluidized‑bed units. The solution integrates a corrosion‑resistant dosing pump, high‑capacity storage vessel, and a control cabinet with PLC‑based feedback that adapts to load variations in real time. Designed for 300 MW‑plus plants, the system reduces sulfur oxide emissions, stabilises bed temperature, and prolongs the life of heat‑transfer surfaces—all while meeting the strict availability requirements of modern power stations.
How It Works
Limestone is fed from a sealed silo into a centrifugal pump that maintains a constant pressure of 0.6–1.2 MPa. The pump’s variable‑speed drive synchronises with the boiler’s load‑control system, ensuring that the injection rate (0.5–3 kg/h per MW) matches the instantaneous sulfur content of the coal. A high‑temperature resistant line delivers the slurry directly to the furnace’s fluidised‑bed zone, where rapid calcination converts calcium carbonate to calcium oxide, which then reacts with SO₂ to form calcium sulphate. Continuous monitoring via temperature, pressure, and flow sensors feeds back to the PLC, allowing automatic set‑point adjustments without operator intervention.
Technical Specifications
| Parameter | Typical Range | Customizable |
|---|---|---|
| Maximum Injection Flow | 0.5 – 3 kg/h per MW | Yes |
| Operating Pressure | 0.6 – 1.2 MPa | Yes |
| Temperature Range (pump inlet) | 30 °C – 80 °C | Yes |
| Material of Construction | Stainless‑steel 316L, Hastelloy C‑276 (optional) | Yes |
| Control Interface | PLC (Modbus/TCP), HMI touchscreen | Yes |
| Power Consumption | ≤ 5 kW (per 100 MW) | Standard |
| Warranty | 24 months parts & labour | Extended options available |
All parameters can be tuned to match plant‑specific coal quality, emission limits, and operational strategy.
Competitive Advantages
- **High Accuracy:** Closed‑loop control maintains injection variance within ±2 % even during rapid load swings.
- **Robust Materials:** All wetted parts are fabricated from corrosion‑resistant alloys, guaranteeing a minimum 10‑year service life under abrasive limestone slurry.
- **Modular Design:** Standard 1 m×1 m modules allow parallel installation, easy expansion, and minimal plant‑downtime for maintenance.
- **Integrated Diagnostics:** Real‑time fault detection and remote monitoring reduce OPEX by up to 15 %.
- **Compliance Ready:** Designed to meet IEC 61892, ISO 9001, and relevant local environmental regulations without additional retro‑fit.
FAQ
What is the minimum order quantity (MOQ) for a limestone injection system for CFB coal boiler?
Our standard turnkey package starts at a single unit, which is sufficient for a 300 MW plant. Larger projects can be bundled for volume discount.
Can the system be customised for different limestone grades or particle sizes?
Yes. We offer interchangeable slurry pumps, variable‑speed drives, and optional grinding‑assist modules to accommodate particle sizes from 0.1 mm up to 5 mm.
What is the typical lead time from order to commissioning?
Standard delivery is 30‑45 days after final engineering sign‑off. Expedited production (15‑20 days) is available for critical schedules, subject to surcharge.
Does the system include on‑site training and after‑sales support?
All installations are accompanied by a 3‑day on‑site training program for operators and maintenance staff. Our 24/7 technical hotline and spare‑parts logistics network ensure rapid response throughout the warranty period.
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