ESP Screw Discharger | Cement Kiln Dust Screw Conveyor
Application
Our ESP screw discharger is the core hopper discharge unit for electrostatic precipitators in cement rotary kiln lines. It extracts collected dust after rapping and feeds it steadily to downstream conveying equipment.
- Kiln #1 ESP 1st stage dust discharge
- Kiln #1 ESP 2nd stage fine dust evacuation
- ESP reserve / standby discharge unit for maintenance redundancy
- Baghouse hopper fly ash discharging, raw meal dust transfer
- Clinker dust and calciner dust removal
Operating condition: 24/7 continuous duty, fine abrasive kiln dust, residual high temperature.
Key Features
- Compact trough design, direct flange connection to ESP hopper outlet
- Fully gasket-sealed construction, prevents dust leakage and hot gas escape
- Low-speed steady discharge, minimizes dust re-entrainment inside ESP
- Thickened screw flight; hardfacing overlay optional for high-abrasion dust
- VFD drive, adjustable discharge rate to match ESP rapping cycle and dust load
- Optional blockage detector, overload protection and bearing temperature monitoring
- Split casing design for easy inspection, flight and seal replacement
- EN ISO welding standards, WPQ, WPS, QAP and material test certificates available
- Full factory FAT test with report, photos and video for witness inspection
Technical Specifications
All parameters customized per ESP stage, dust load and site layout
| Item | Specification |
|---|---|
| Handling material | Kiln dust, fly ash, fine raw meal dust |
| Discharge capacity | Customized by ESP field dust generation |
| Layout | Horizontal / slight inclined installation |
| Housing material | Carbon steel / 304 stainless steel |
| Screw flight | Standard thick flight; hardfaced wear protection optional |
| Shaft seal | Gland packing seal / air purge anti-dust seal |
| Drive | Helical gear motor with variable frequency control |
| Max material temperature | Up to 220°C |
Material & Optional Configurations
- Screw flight: hardfacing wear overlay, replaceable flight segments
- Sealing assembly: air purge seal for high-temperature dusty environment
- Safety instruments: choke switch, temperature transmitter
- Surface coating: high-temperature anti-corrosion paint
- Control interlock: standby switchover function for reserve ESP discharger
Reference Projects
ESP screw discharger site references
- Cement kiln ESP 1st stage screw discharger system for high dust volume
- Cement kiln ESP 2nd stage fine dust screw discharger
- Standby reserve screw discharger 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, sealing components
FAQ
Q1: What is the difference between ESP screw discharger and normal screw conveyor?
A: ESP screw discharger is optimized for hopper bottom discharge, matched with ESP rapping rhythm, prioritizing stable feeding and low dust re-entrainment. Normal screw conveyor focuses on long-distance transport.
Q2: Can one design cover 1st stage, 2nd stage and reserve unit?
A: The basic structure is similar, but we tune capacity, wear protection and power according to dust loading of each stage.
Q3: Is hardfacing required for kiln dust?
A: Not mandatory. Hardfacing is an optional upgrade for extended service life under highly abrasive kiln dust.
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 dimension and special wear 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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