Screw Discharger | ESP Hopper Bottom Screw Conveyor for Kiln Dust Removal
Application
This enclosed screw feeder is purpose-built for dust discharge under cement rotary kiln ESP hoppers. It handles fine hot kiln dust and fly ash collected by ESP plates and transports ash steadily to downstream conveying equipment.
- Cement kiln ESP 1st stage dust collection and feeding
- Cement kiln ESP 2nd stage fine fly ash extraction
- ESP reserve standby dust evacuation unit
- Baghouse hopper fly ash discharge, raw meal dust feeding
- Calciner dust and clinker dust transfer
Operating condition: 24/7 continuous operation, fine abrasive dust, residual high temperature.
Key Features
- Fully enclosed casing with high-temperature gaskets, preventing fugitive dust and hot gas leakage
- Low-speed steady feeding, reduces dust re-entrainment inside ESP chamber
- Thickened screw flight; hardfacing overlay optional for high-abrasion dust
- High-temperature resistant bearing assembly, air cooling bearing optional
- VFD variable speed drive, adjustable feed rate to match ESP rapping cycle
- Custom flange interface to directly mate with ESP hopper outlet
- Optional blockage detector, overload protection and bearing temperature monitoring
- Split trough design for convenient maintenance of flight, shaft and seals
- EN ISO welding standards, WPQ, WPS, QAP and material test certificates available
- Complete factory FAT test with formal report, photos and video for witness inspection
Technical Specifications
All parameters customized according to dust flow rate, temperature and site layout
| Item | Specification |
|---|---|
| Handling material | Hot kiln dust, fly ash, fine raw meal dust |
| Capacity | Customized per ESP dust load |
| Layout | Horizontal or slight inclined installation |
| Housing material | Carbon steel / 304 stainless steel |
| Screw flight | Thick flight; hardfaced wear protection optional |
| Shaft seal | High-temperature gland packing seal / air purge seal |
| Drive unit | Helical gear motor with VFD speed regulation |
| Max material temperature | Up to 220°C |
Material & Optional Configurations
- Screw flight: hardfacing wear overlay, replaceable flight segments
- Trough protection: manganese steel / high chromium bolt-on wear liner
- Sealing: air purge anti-dust seal for high-temperature dusty environment
- Safety instruments: choke switch, temperature transmitter
- Coating: high-temperature anti-corrosion paint
- Control interlock: standby switchover for reserve ESP screw feeder
Reference Projects
High-temperature ESP screw feeder references
- Cement kiln ESP 1st stage fly ash high-temperature screw feeding system
- Cement kiln ESP 2nd stage fine kiln dust enclosed screw feeder
- Standby high-temperature screw feeder for ESP hopper redundancy
Site installation photos, FAT videos and GA drawings can be provided upon request.
Standards & Our Service
- Design & welding standard: EN ISO, ISO 9001
- Deliverable documents: GA drawing, assembly drawing, spare parts list, MTC, QAP, WPQ & WPS
- Pre-delivery: Factory FAT test with formal report, photos and video
- Technical support: Installation guidance, commissioning assistance, operator training
- Warranty: 12 months after commissioning or 18 months after delivery
- Long-term spare parts supply: screw flight, shaft, bearing assembly, high-temperature seals
FAQ
Q1: What is the difference between 1st stage and 2nd stage ESP screw feeder?
A: The 1st stage carries higher flow of coarser kiln dust with stronger abrasion; the 2nd stage handles lower flow of finer fly ash. We adjust capacity, flight thickness and wear protection accordingly.
Q2: Can this feeder run continuously alongside the cement kiln?
A: Yes. It is designed for non-stop 24/7 continuous duty matching cement kiln operating cycles.
Q3: Is air purge seal a standard supply?
A: Gland packing seal is standard. Air purge seal is an optional upgrade for higher temperature and dusty conditions.
Q4: Can we witness FAT inspection at your factory?
A: Yes. Witness FAT is available. Full test records, photos and videos will be supplied.
Q5: What information do you need for quotation?
A: Dust flow rate for each stage, dust temperature, bulk density, conveying length, hopper flange size and abrasion requirement.
Request Custom Technical Proposal
Fill in the form below, or send your requirement directly to our email / WhatsApp. Our bulk solids engineer will reply within 24 working hours with layout drawing and formal offer.
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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