Complete solutions for biomass boiler ash handling
Complete Solutions for Biomass Boiler Ash Handling
Biomass boilers, which use organic materials like wood chips, pellets, agricultural residues, and other biomass feedstocks, generate significant amounts of ash as a byproduct of combustion. Handling this ash efficiently is critical for maintaining boiler operation, minimizing environmental impact, and ensuring regulatory compliance.
A complete biomass boiler ash handling solution includes integrated systems for the safe, reliable, and cost-effective removal, transport, storage, and disposal or reuse of both bottom ash and fly ash.
Components of a Complete Ash Handling Solution
1. Bottom Ash Handling System
Bottom ash consists of larger particles and residues that settle at the bottom of the boiler or furnace.
- Submerged Scraper Conveyors (SSC):
- Water-filled troughs with chain-driven scrapers collect and cool hot bottom ash.
- Transport ash to a collection point for further processing or disposal.
- Advantages:
- Reduces dust emissions.
- Ensures safe handling of hot ash.
- Dry Bottom Ash Conveyors:
- Ideal for plants focused on water conservation.
- Use mechanical systems like screw conveyors or drag chain conveyors to remove ash without the need for water.
- Benefits:
- Zero water usage.
- Suitable for abrasive and high-temperature ash.
2. Fly Ash Handling System
Fly ash consists of fine particles that are carried by flue gases and must be captured using pollution control devices.
- Pneumatic Fly Ash Conveying:
- Uses air pressure or vacuum systems to transport ash through pipelines to silos or disposal points.
- Options:
- Dilute Phase: For lighter ash transport over long distances.
- Dense Phase: For energy-efficient transport of larger volumes.
- Mechanical Fly Ash Conveyors:
- Screw conveyors or drag chain conveyors transport fly ash from hoppers to storage silos.
- Vacuum Ash Collection:
- Uses suction to collect ash from electrostatic precipitators (ESPs), baghouses, or cyclones.
- Flexible and suitable for multiple collection points.
3. Intermediate Storage Systems
- Ash Silos:
- Temporary storage for both bottom and fly ash.
- Equipped with features like:
- Dust filters.
- Load-out systems for truck or rail transport.
- Level sensors to monitor storage capacity.
- Big Bag Systems:
- Fly ash is packed into large bags for easier handling and transportation to disposal or reuse sites.
4. Ash Transport Systems
Efficient ash transport systems are critical to minimize handling time and environmental impact.
- Conveyors:
- En-Masse Conveyors: Move large quantities of ash horizontally or at an incline in a compact footprint.
- Screw Conveyors: Transport ash over short distances within the plant.
- Drag Chain Conveyors: Handle abrasive ash efficiently in rugged environments.
- Pneumatic Transport Systems:
- Suitable for lightweight, fine fly ash.
- Cover long distances while reducing the risk of spillage.
5. Dust Control and Environmental Measures
- Enclosed Systems:
- Prevent dust emissions and spillage, ensuring compliance with air quality regulations.
- Baghouses and Filters:
- Remove ash particles from exhaust gases and prevent their release into the atmosphere.
- Ash Quenching:
- For wet systems, bottom ash is cooled immediately in a submerged conveyor to prevent ash from becoming airborne.
6. Disposal and Reuse Options
- Recycling Fly Ash:
- Fly ash can be reused in:
- Cement production.
- Concrete manufacturing.
- Soil stabilization and road construction.
- Fly ash can be reused in:
- Agricultural Use of Biomass Ash:
- Ash rich in nutrients like potassium and phosphorous can be used as a fertilizer or soil amendment.
- Ash Disposal:
- Non-recyclable ash can be safely disposed of in landfills designed for industrial waste.
Integration of Ash Handling Systems
A fully integrated ash handling system ensures seamless operation and minimal downtime.
- Control Systems:
- Modern ash handling solutions incorporate automation and real-time monitoring to streamline operations and optimize performance.
- Features:
- Remote monitoring of conveyors and hoppers.
- Automatic ash removal based on fill levels.
- System Customization:
- Ash handling solutions are tailored to match the biomass feedstock, boiler size, ash production rates, and environmental regulations.
Advantages of Complete Ash Handling Solutions
- Efficiency:
- Continuous ash removal ensures uninterrupted boiler operation.
- Environmental Compliance:
- Dust suppression and enclosed systems meet air quality and waste management standards.
- Energy Savings:
- Modern systems like dense phase pneumatic conveyors reduce energy consumption.
- Low Maintenance:
- Robust designs and abrasion-resistant materials ensure long equipment life with minimal upkeep.
- Cost Effectiveness:
- Automated systems and ash recycling reduce operational and disposal costs.
- Adaptability:
- Solutions can be scaled or modified to suit changes in boiler operation or ash generation rates.
Applications in Biomass-to-Energy Facilities
- Power Plants: Efficiently handle ash from utility-scale biomass boilers.
- Industrial Boilers: Suitable for paper mills, food processing plants, and sugar mills using biomass fuels.
- Waste-to-Energy Plants: Manage ash from mixed biomass and waste combustion.
Conclusion
Complete ash handling systems for biomass boilers are essential for efficient operation, regulatory compliance, and environmental protection. By integrating advanced technologies like pneumatic conveyors, submerged scraper conveyors, and dust suppression systems, biomass-to-energy facilities can ensure sustainable and cost-effective ash management.
Would you like assistance in designing a complete ash handling system for your biomass boiler?
Complete solutions for biomass boiler ash handling
Process
The high-temperature ash discharged from the furnace is firstly broken into small pieces by the roller-type slag breaker to facilitate cooling and transportation.
After the crushing of the ash and slag into the water-cooled screw slag extractor and between the screw blade and the outer cylinder cooling heat transfer back out.
If necessary, air lock (star ash discharge valve) can be provided at the outlet of the slag cooler.
Ash inlet temperature is less than 900 ℃, clinker size less than 100 mm, the transmission distance is 4 to 7 m, the level of the installation
Advantages
1. Facilitate the comprehensive utilization of slag.
2. Reasonable structure design, reliable operation, safe operation and good sealing performance.
3. Good load adaptability and remote control
Scraper slag remover
1. The cast stone slab is placed at the bottom of the base groove, which can effectively improve the wear resistance of the material and prolong the service life of the base groove.
2. The scraper material of the double-chain scraper is cast steel, the transmission chain is 25MNV high-strength material for mining, and the structure is double-row ring welding. In the process of transporting ash, the tightness of the chain can be automatically adjusted by the device at the front of the device.
3. The double-chain slag removing machine can reduce the labor intensity of the furnace workers, improve the working conditions of the boiler room, and ensure the boiler production efficiency to the greatest extent.
4. Compared with other closed type slag removing machines, the double-chain type is an open design, which can ensure that all ash can be discharged to the outside of the boiler.
5. The scraper support is a cast stone rail support method, which avoids various problems of supporting by the rollers, and can effectively reduce the maintenance cost of the equipment.
6. It is suitable for the slag removal of single-drum boilers with all slag outlets arranged at the rear and lower parts of the boiler.
7. The chain is automatically tensioned by manual or machine. The double overload protection system of the motor can ensure that the chain is not dragged, not stacked, and the ash is transported smoothly, meeting the requirements of industrial boilers and heating boilers.
Boiler removal scraper type
TYPE (Length <8M Slag 0.6-2.3T/H)
For boiler 2ton/h~25ton/h
SELECTION & TECHNICAL QUESTIONS
Q1: How do I select the right conveyor model? What information should I provide?
> To recommend the most suitable solution, please provide the following details:
> 1. Material type: What material are you conveying? (e.g., fly ash, wood chips, biomass pellets, bottom ash, etc.)
> 2. Material properties: Particle size, temperature, moisture content, abrasiveness
> 3. Capacity requirement: How many tons per hour (t/h) do you need?
> 4. Installation conditions: Conveying distance, incline angle, space limitations
> 5. Application industry: Which industry is this for? (e.g., waste-to-energy plant, biomass power plant, cement plant)
> You can also email us or contact us via WhatsApp. Our engineers will get back to you within 24 hours.
Q2: What is the difference between screw conveyors and chain conveyors? Which one should I choose?
> Both types have different applications:
> – Screw Conveyors: Best for powdery and small-grain materials (e.g., fly ash, cement powder). Good sealing performance, simple structure, low maintenance cost.
> – Chain Scraper Conveyors: Best for bulky, highly abrasive materials (e.g., bottom ash, municipal solid waste, biomass fragments). Supports multiple inlet and outlet points.
> – Bucket Elevators: Ideal for vertical or steep-incline material lifting.
> If you are not sure, tell us your material and working conditions, and our engineers will help you choose.
Q3: Can your equipment handle high-temperature materials? What is the maximum temperature?
> We can customize equipment according to material temperature:
> – Standard type: 0~80°C, carbon steel
> – Medium temperature type: 80~200°C, thickened wear-resistant liner
> – High temperature type: 200~400°C, special heat-resistant steel, optional cooling jacket
> Please tell us your material temperature, and we will recommend the most suitable material solution.
Q4: Are there any limits on conveying distance and lifting height?
> Standard design range:
> – Screw conveyor: Single section up to 70 meters; multiple sections can be connected for longer distances
> – Chain conveyor: Single machine up to 60 meters
> – Bucket elevator: Lifting height up to 50 meters
> We can also customize for extra-long distances or special angles. Contact us for detailed solutions.
Q5: Do you provide explosion-proof design?
> Yes. For explosive and flammable conditions such as pulverized coal and biomass dust, we offer:
> – Explosion-proof motors (Ex d IIB T4 standard)
> – Reserved openings for explosion vents / rupture discs
> – Fully sealed structure to prevent dust leakage
> Please specify your explosion-proof rating requirements.
CUSTOMIZATION & MANUFACTURING
Q6: Do you support customization? What is the lead time?
> Over 90% of our equipment is customized according to customer working conditions. Standard models take about 90–120days. Special customizations take 120–180 days, depending on configuration complexity.
Q7: What material options do you offer?
> Common materials include:
> – Carbon steel (Q235B): Standard working conditions
> – Wear-resistant steel (NM400/NM500): Highly abrasive materials
> – Stainless steel 304/316L: Food, chemical, corrosion-resistant requirements
> – Bi-metal wear-resistant composite plate: Extreme abrasion conditions
> We will recommend the most cost-effective material solution based on your material properties.
Q8: What certifications do you have?
> We hold the following certifications:
> – ISO 9001:2015 Quality Management System
> – ISO 14001 Environmental Management System
> – ISO 45001 Occupational Health & Safety Management
> – CE Certification (EN 1090 Steel Structure)
> If you need scanned copies of specific certificates, please contact us.
DELIVERY & LOGISTICS
Q9: Which countries do you export to? Do you have export experience?
> Our equipment has been exported to more than 20 countries worldwide, including:
> – Europe: Germany, France, Poland, Turkey, etc.
> – Southeast Asia: Singapore, Thailand, Indonesia, Vietnam, etc.
> – Middle East: Saudi Arabia, UAE, etc.
> – South America**: Brazil, Chile, etc.
> We are familiar with the full export process: packaging, customs declaration, and ocean freight. We can provide FOB, CIF, and other trade terms.
Q10: What is your packaging method? Is it suitable for long-distance ocean shipping?
> Export-standard packaging:
> – Large items / complete machines**: Rust prevention + waterproof film + fumigated solid wood pallet
> – Precision components: Wooden case with shock-absorbing filling
> – Random accessories: Categorized packing with detailed packing list
> All wooden packaging meets IPPC fumigation standards for direct customs clearance.
Q11: What is your minimum order quantity?
> We do not have a strict minimum order quantity. Single-unit orders are welcome. Bulk orders can enjoy more favorable pricing.
INSTALLATION & AFTER-SALES
Q12: Do you provide installation guidance? Do engineers need to come to site?
> We offer two service options:
> 1. Remote guidance: Detailed installation drawings and operation manuals, video guidance for installation (free of charge)
> 2. On-site service: Dispatch engineers to site for installation and commissioning (travel costs are additional)
> Most customers choose remote guidance. Our equipment is designed as a modular structure for easy installation.
Q13: What is the warranty period? What are the wearing parts?
> Standard warranty period is 12 months (from the date of arrival at port).
> Wearing parts list:
> – Chain / screw flights: Approximately 1–3 years, depending on material abrasiveness
> – Liners: Approximately 2–4 years
> – Bearings: Approximately 2–3 years
> We recommend ordering a wearing-parts spare kit together with your first order.
Q14: How do you solve problems during operation?
> We provide 7×24 technical support:>
> – Response within 24 hours for technical issues
> – Remote video troubleshooting guidance
> – Engineer on-site service when necessary
> – Common spare parts in stock for fast delivery
QUOTATION & COOPERATION
**Q15: How can I get a quote? How long does it take?
> Quotation process:
> 1. You provide material parameters, capacity, installation conditions, and other requirements
> 2. Our engineers evaluate and select the appropriate model
> 3. Formal quotation and technical proposal provided within 7 working days
> You can contact us via email, or the online inquiry form.
Q16: What are your payment terms?
> Standard payment terms:
> – 30% advance payment: After contract signing, to start production
> – 70% balance: Before shipment, or against copy of Bill of Lading
For long-term cooperative customers, more flexible payment terms can be negotiated.
Follow these 3 steps to find your ideal conveyor solution
Step 1: Identify Your Material Type
Different materials require different conveyor designs. Tell us what you are conveying:
| Material Category | Examples | Recommended Conveyor Type |
| Powder / Fine Granules | Fly ash, cement powder, lime powder | Screw Conveyor |
| Small Granules / Pellets | Biomass pellets, plastic granules, grain | Screw Conveyor / Belt Conveyor |
| Fragments / Chips | Wood chips, bark, agricultural residues | Chain Scraper Conveyor |
| Bulky / Abrasive | Bottom ash, slag, MSW, clinker | Chain En-Masse Conveyor |
| Vertical Lift | Any bulk material needs vertical transport | Bucket Elevator |
Step 2: Define Your Working Conditions
Please prepare the following parameters before contacting us:
| Parameter | Why It Matters | Example |
| Capacity (t/h) | Determines conveyor size and power | 10 t/h, 50 t/h, 100 t/h |
| Conveying Distance (m) | Determines machine length | 15m horizontal, 30m incline |
| Incline Angle (°) | Affects capacity and design | 0° horizontal, 30° incline |
| Material Temperature (°C) | Determines material grade | Ambient, 150°C, 300°C |
| Moisture Content (%) | Affects discharge design | Dry, damp, wet (needs dewatering) |
| Abrasiveness | Determines liner thickness | Low, medium, high |
| Application Industry | Determines certification needs | Power plant, cement, mining, recycling |
Step 3: Choose Configuration Options
Based on your answers above, our engineers will recommend:
Material grade — carbon steel / wear-resistant steel / stainless steel
Sealing type — open trough / fully enclosed / gas-tight
Drive system — motor power, gearbox brand, speed range
Auxiliary options — explosion-proof motor, cooling jacket, cleaning device, level sensors
Not Sure Where to Start?
Send us your basic requirements, and our engineers will design a customized solution for you — completely free.
Email: bootec@bootecgroup.com Response time: Within 24 hours
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