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| Product Overview |
The peripheral water filter of the dewatering silo adopts three prismatic filter plate instead of the channel filter plate, and the fixing between the plate and the wall of silo adopts pin-type connection (hang from the above and support from the bottom) instead of welding method, which achieves no bolt connection and is easy to install and disassemble. Meanwhile, the angle between the filter plates has increased to reduce the slag sticking on the wall. The center filter device of the dewatering silo adopts hanging cage type filter core stack structure, achieving no bolt connection. The filter core can regenerate after cleaning or acid cleaning, which has extended the service life of the filter. If the filter core needs to be replaced or checked, use the special anchor for hoisting the filter to take it out of or put it into the silo, which makes the inspection and repair more easy and convenient. Meanwhile, since the maintenance staff do not need go into the silo, it has greatly reduced the risk of filter replacement. The dewatering bin adopts “four bolts support four wheel type slag discharge valve”, which is convenient for adjusting the clearance between the valve and the slag outlet. The slag discharge valve has equipped with opening indicating device so that the opening condition of the valve can be monitored in the control room The sealing condition of the slag discharge valve is one important index for checking the performance of the dewatering device. This dewatering silo adopts T-shape sealing ring fixed with flange. For the self-sealing feature of the nozzles, the increase of the internal pressure for sealing ring will enhance the sealing performance instead of falling of nozzles and air leaking The buffering disk is a multi-hole round disk lined with cast stone at the slurry inlet. The flowing slurry will be buffered by the disk and then flow into the silo through the holes. This can minimize the disturbance caused by the slurry to the deposited slag so as to improve the quality of the overflow water. |
| 1 | Model | Customized per ash rate |
| 2 | Silo volume | 20 – 500 m³ |
| 3 | Diameter | 2.5 – 8 m |
| 4 | Total height | 6 – 20 m |
| 5 | Cone angle | 55° – 65° from horizontal |
| 6 | Shell material | Q235B / Q345R / SS304 / SS316L |
| 7 | Plate thickness | 6 – 16 mm |
| 8 | Liner option | PU / chrome carbide / stone / none |
| 9 | Design pressure | Atmospheric |
| 10 | Ash temperature | ≤ 80 °C |
| 11 | Inlet size | DN200 – DN800 |
| 12 | Outlet size | DN200 – DN600 |
| 13 | Discharge gate | Bi-directional sealing gate |
| 14 | Aeration | Air cannons / aeration pads |
| 15 | Level indicator | Radar / ultrasonic / rotary |
| 16 | Platform & ladder | Top platform + safety railing + vertical ladder |
| 17 | Painting | Sa2.5 + epoxy primer + PU topcoat |
| 18 | Wind / seismic / snow load | Per local building code |
| 19 | Warranty | 12 months after commissioning |
| 20 | Certification | CE / ISO 9001 |
| 1 | Conical bottom design ensures settled ash concentrates at cone tip and discharges by gravity, eliminating dead corner and reducing manual cleaning work for power plant operators. |
| 2 | Side wall aeration pads or air cannons prevent wet ash from sticking and bridging, ensuring smooth discharge even with high-moisture bottom ash and reducing unscheduled shutdown. |
| 3 | Overflow water recycling reduces fresh water consumption and lowers wastewater discharge, meeting environmental regulations and saving long-term operating cost for power plant. |
| 4 | Wear-resistant PU liner or chrome carbide overlay extends cone section service life, reducing maintenance frequency and lowering spare parts cost over equipment lifetime. |
| 5 | Carbon steel Q345R heavy plate welded structure provides high strength and rigidity, suitable for large volume silos 50-500 m³ under wind, seismic and snow load. |
| 6 | Dust-tight top cover connected to plant dust collector prevents ash dust emission, meeting strict environmental emission limits and improving working environment. |
| 7 | Single or double chamber alternating design achieves continuous ash discharge without interrupting upstream ash conveyor, improving whole ash handling system availability. |
| 8 | PLC + SCADA remote monitoring transmits ash level, water level, gate position and fault alarm to control room, enabling unattended operation and fast response to abnormal condition. |
| 9 | Factory sectional fabrication with site welding or flange connection enables transport of large silo to remote project sites, suitable for international ocean freight. |
| 10 | 100% radiographic testing on circumferential welds plus hydraulic pressure test ensures zero leakage after installation, avoiding costly plant shutdown caused by water leakage. |
| 11 | Anti-corrosion epoxy primer + polyurethane topcoat suitable for outdoor installation in coastal, humid or corrosive industrial environments, extending silo service life. |
| 12 | Custom capacity 20-500 m³ with diameter 2.5-8 m and height 6-20 m adapts to any plant layout and ash production rate, maximizing space utilization. |
| 13 | We provide complete package: silo body, platform, ladder, gate, level sensor, overflow trough and pipeline, simplifying customer procurement and reducing interface risk. |
| 14 | 12 months warranty with spare parts in stock (gate seal, air cannon diaphragm, level sensor) ensures fast replacement and minimum downtime. |
| 15 | On-site installation supervision and commissioning by experienced steel structure engineers ensures silo alignment, sealing and performance from day one. |
| 16 | Compliance with GB, ASME and DIN standards with CE certification meets international EPC project specification and procurement requirement. |
| 17 | Gravity-fed ash reception below conveyor outlet eliminates slurry pump energy consumption and reduces pump wear, lowering long-term operating cost. |
| 18 | Ash moisture reduced below 20% makes bottom ash suitable for truck transport and comprehensive utilization as cement additive or road base material. |
| 19 | Heating jacket or steam tracing option prevents ash freezing in winter for plants in cold climate regions, ensuring year-round reliable operation. |
| 20 | Silo designed for wind, seismic and snow load per local building code, suitable for installation in various climate zones worldwide from tropical to arctic. |
| 21 | We have exported to 25+ countries including India, Vietnam, Indonesia, Pakistan, Turkey, Brazil and Russia, with proven references in coal-fired power sector. |
| 22 | Retrofit solution keeps existing foundation, inlet pipe and overflow return line, minimizing civil work and plant shutdown during old ash system upgrade. |
| 23 | Sandblasting to Sa2.5 before painting ensures coating adhesion and long-term corrosion resistance under wet ash and water contact. |
| 24 | Multiple overflow outlets around top circumference ensure even water level and prevent localized turbulence disturbing settled ash layer, improving dewatering efficiency. |
| 25 | Heavy-duty discharge gate with bidirectional sealing prevents ash leakage and water dripping, keeping plant floor clean and safe for operators. |
| 26 | Radar or ultrasonic level sensor provides continuous level reading with high/low alarm, enabling automatic ash discharge control and preventing overfilling. |
| 27 | Third-party inspection SGS/BV/TUV welcome before shipment, ensuring silo meets customer specification and international welding standard. |
| 28 | Knocked-down section shipping on open top containers or flat racks with all bolts and gaskets included, suitable for international ocean freight to remote sites. |
| 29 | Factory direct price with strict quality control from plate incoming inspection to final painting delivers cost-effective and reliable steel structure. |
| 30 | 7-day quick proposal with GA drawing and quotation upon receiving boiler ash rate, plant layout and required volume, accelerating customer project decision. |
FAQ
| 1 | What is a dewatering slag silo? | It is a vertical conical-bottom steel vessel used in power plant bottom ash system. It receives ash slurry, performs settling and dewatering, stores dewatered ash and discharges it to truck or conveyor. |
| 2 | How does the dewatering silo work? | Ash slurry enters from top, solid particles settle to cone bottom by gravity, clear water rises and overflows through top weir, dewatered ash is discharged through bottom gate periodically. |
| 3 | What silo capacity do you offer? | Standard volume ranges from 20 m³ to 500 m³, with diameter 2.5-8 m. Larger or smaller volume can be customized per customer ash discharge rate and site layout. |
| 4 | What steel grade do you use for the silo? | Standard is Q235B carbon steel, Q345R for pressure or heavy load. For corrosive ash we offer SS304 / SS316L stainless steel or rubber lined silo. |
| 5 | How do you prevent ash bridging in the cone? | We install air cannons or aeration pads on cone wall. Compressed air pulses break up stuck ash and ensure smooth discharge. Vibrator is optional for fine wet ash. |
| 6 | What happens to the overflow water? | Overflow water is collected through top weir, pumped back to ash water circulation system or thickener, achieving water recycling and reducing fresh water consumption. |
| 7 | How is dewatered ash discharged from the silo? | Bottom gate opens periodically, ash falls by gravity into truck, belt conveyor or screw feeder. Gate can be pneumatic, electric or hydraulic with remote control. |
| 8 | Do you recommend single or double chamber silo? | Double chamber allows alternating filling and dewatering, achieving continuous ash discharge without stopping upstream conveyor. Single chamber is more economical for small plants. |
| 9 | How do you measure ash level inside the silo? | We use radar or ultrasonic level sensor for continuous measurement, plus rotary paddle switch for high/low alarm. Signals transmit to PLC control room. |
| 10 | What painting system do you use for outdoor silo? | Sandblast to Sa2.5, then 2 coats epoxy zinc-rich primer and 2 coats polyurethane topcoat, total film thickness 200-250 μm, suitable for coastal and industrial environment. |
| 11 | Can you replace our old ash hopper with new dewatering silo? | Yes. We provide on-site measurement, keep existing foundation, inlet pipe and overflow return line, minimizing civil work and plant shutdown during retrofit. |
| 12 | How do you ship large silos to our site? | Large silos are shop-fabricated into sections, shipped on open top containers or flat racks. All bolts, gaskets and welding electrodes are included for site assembly. |
| 13 | What is your warranty period? | We provide 12 months warranty after commissioning. Spare parts like gate seal, air cannon diaphragm and level sensor are in stock for fast delivery. |
| 14 | What certifications do you have? | We have ISO 9001 and CE certification. Design complies with GB 50017, ASME and DIN standards. Third-party inspection SGS/BV/TUV is welcome. |
| 15 | What is the delivery time for a dewatering silo? | Standard silo lead time is 45-60 days. Custom large silo with special liner or stainless steel takes 75-90 days, depending on drawing confirmation. |
| 16 | How can we get a detailed quotation? | Please provide boiler ash discharge rate, required volume, site layout drawing and preferred steel grade. We will send GA drawing and quotation within 7 working days. |
| 17 | Do you provide on-site installation service? | Yes, we send 1-2 experienced steel structure engineers to supervise site welding, alignment and commissioning, with visa and round-trip flight arranged by us. |
| 18 | How to prevent ash freezing in winter? | We offer heating jacket or steam tracing on cone section, plus insulation layer, preventing ash from freezing and solidifying in cold climate regions. |
| 19 | How do you protect the cone from abrasive ash wear? | We provide polyurethane liner, chrome carbide overlay or cast stone liner in cone section, extending service life under abrasive bottom ash flow. |
| 20 | Why should we choose your dewatering silo? | We have 15+ years experience, exported to 25+ countries, provide complete engineering package, factory direct price, strict quality control and 12-month warranty with proven power plant references. |
