Coal & Coke Testing Equipment
Bituminous Coal Crucible Swelling Number Tester for Free Swelling Index and Caking Property Analysis
Item Number : KT-TE52
Price varies based on specs and customizations
- Crucible Swelling Number (CSN) Range
- 0 to 9 (and >9)
- Maximum Operating Temperature
- 1000°C
- Rated Power Consumption
- 800W - 1000W
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Product Overview
This bituminous coal crucible swelling number tester is a specialized laboratory apparatus engineered to determine the crucible swelling number (CSN) and evaluate the plastic and caking properties of coal. By subjecting a prepared coal sample to standardized high-temperature heating conditions, the system transforms raw coal into a solid coke button. The resulting button profile is meticulously compared against standard reference silhouettes to establish a definitive swelling index ranging from 0 to 9 (or greater than 9), providing essential data regarding the swelling, agglomerating, and coking behavior of bituminous coal.
Designed specifically for coal mining operations, commercial testing laboratories, coking facilities, and thermal power utilities, the equipment serves as an indispensable tool for coal classification, blending optimization, and coking feedstock assessment. In research and metallurgical quality control environments, obtaining an accurate caking index is crucial for predicting coke mechanical strength, preventing oven-wall damage during carbonization, and ensuring continuous production efficiency.
Built to withstand rigorous thermal cycling, the testing system incorporates a vertical, single-hole cylindrical furnace lined with refractory clay and premium aluminum silicate insulation. Supported by a responsive silicon-controlled rectifier (SCR) voltage control system, the unit delivers uniform thermal transfer and strictly adheres to standardized heating rates. Its proven structural integrity and stable bottom-heating architecture ensure dependable, repeatable performance during intensive daily laboratory workloads.
Key Features
- Precision Thermal Architecture: Built with high-grade iron-chromium-aluminum (Fe-Cr-Al) resistance heating wire arranged at the base of the furnace, the bottom-heating configuration delivers rapid thermal response and concentrated heating directly to the crucible base for uniform devolatilization.
- Superior Thermal Insulation: Constructed with a sintered refractory clay body surrounded by dense aluminum silicate fiber insulation, the furnace minimizes peripheral heat loss, maintains outer shell safety, and maximizes energy efficiency during extended 1000°C testing cycles.
- Integrated SCR Voltage Regulation: Powered by a millivoltmeter silicon-controlled rectifier (SCR) voltage adjustment system, the apparatus enables precise heating curve control, allowing operators to achieve smooth, linear temperature ramping in strict compliance with GB/T 5448.
- Three-Part Modular Design: Comprising an independent crucible electric furnace, an ergonomic temperature controller, and a specialized coke profile observation viewer, the modular assembly streamlines sample manipulation, viewing, and routine maintenance.
- Standardized Profile Assessment: The integrated coke profile observation viewer features an optical viewing tube with standardized reference cross-sections (numbered 0 to 9), enabling fast, parallax-free visual comparison and definitive crucible swelling index (CSN) classification.
- Rapid Heat-Up Capability: Engineered with an 800W to 1000W rated power envelope, the system achieves standard testing temperatures up to 1000°C within minutes, shortening sample turnaround times in high-throughput industrial analysis labs.
- Compact Benchtop Footprint: The vertical, single-aperture cylindrical structure occupies minimal laboratory bench space, while isolated electrical enclosures protect internal wiring and control circuitry from abrasive coal dust and volatile off-gases.
- Durable Construction: Utilizing oxidation-resistant heating alloys and chemical-resistant sintered refractories, the internal chamber resists repeated thermal shock, volatile hydrocarbon condensation, and mechanical wear from frequent crucible handling.
Applications
| Application | Description | Key Benefit |
|---|---|---|
| Coking Coal Classification | Quantitative classification of metallurgical bituminous coals according to thermoplastic swelling properties and international coal grade standards. | Ensures precise categorization of incoming coal shipments and verifies commercial specification compliance before processing. |
| Blast Furnace Coke Optimization | Determination of coal caking properties to evaluate raw coal suitability for blending blends used in slot-oven carbonization. | Prevents excessive carbonization wall pressures while maximizing the structural integrity and cold/hot strength of the resulting coke. |
| Thermal Power Plant Fuel Assessment | Evaluation of coal swelling tendencies and agglomeration behavior prior to combustion in pulverized coal or fluidized-bed boilers. | Minimizes boiler wall slagging, avoids burner clogging, and optimizes burner firing settings by identifying highly swelling coal stocks. |
| Commercial Coal Inspection & Trade | Verification of Free Swelling Index (FSI) and Crucible Swelling Number (CSN) for import/export commercial transaction settlement. | Provides transparent, standard-compliant validation of fuel specifications, eliminating disputes between coal traders and industrial buyers. |
| Metallurgical Research & Development | Academic and institutional investigation into coal pyrolysis, devolatilization kinetics, and the thermoplastic phase of synthetic carbon matrices. | Delivers repeatable thermal conditions required to isolate chemical mechanisms governing fluidity and swelling characteristics in carbonaceous materials. |
| Carbon Electrode Manufacturing | Testing of pitch, anthracite blends, and binder-caking behavior for formulating anodes and specialty graphite electrodes. | Prevents structural cracking during industrial baking by matching swelling index compatibility between filler cokes and binder matrices. |
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Product Item Number | KT-TE52 |
| Core Measurement Standard | Compliant with GB/T 5448 (Coal Crucible Swelling Number Determination) |
| Swelling Index Scale | Crucible Swelling Number (CSN) / Free Swelling Index (FSI) Range 0 to 9, >9 |
| Furnace Architecture | Vertical single-hole cylindrical electric furnace, bottom-heating configuration |
| Heating Element Material | High-grade Iron-Chromium-Aluminum (Fe-Cr-Al) resistance alloy wire |
| Furnace Lining & Body | Sintered refractory clay cylinder surrounded by multi-layer aluminum silicate insulation |
| Maximum Operating Temperature | 1000°C |
| Heating Rate Control | Standardized time-temperature curve controlled via SCR voltage regulator |
| Temperature Control System | Millivoltmeter silicon-controlled rectifier (SCR) step-less voltage adjustment system |
| Observation System | Dedicated optical coke profile observation viewer with standardized CSN silhouettes |
| Operating Voltage | 220V ± 22V AC, 50 Hz |
| Rated Power Consumption | 800 W – 1000 W |
| System Components | Crucible electric furnace, electronic temperature/voltage controller, coke profile viewer |
| Crucible Compatibility | Standard fused-silica (quartz) crucible with specialized lid per test standard |
Why Choose This Product
- Strict Standard Compliance: The system is engineered to rigorously conform to GB/T 5448 standard requirements, providing the repeatable heating rates and thermal profile necessary to produce reliable, audit-ready Crucible Swelling Numbers across every shift.
- Heavy-Duty Industrial Build: Fabricated with robust sintered clay refractories and industrial-grade Fe-Cr-Al heating elements, the furnace withstands daily high-heat cycling without structural deformation or resistance degradation.
- Precision Power Delivery: The dedicated SCR voltage regulation system eliminates current spikes, delivering smooth electrical control to guarantee uniform crucible base heating during volatile matter release.
- Operational Simplicity: With an integrated observation viewer and intuitive analog voltage adjustment, laboratory technicians can execute end-to-end testing, from raw sample heating to profile index matching, with minimal setup complexity.
- Complete Analytical Solution: Supplied with matching furnace, control, and viewing sub-assemblies, the unit eliminates cross-vendor component mismatches, offering a reliable turnkey testing package for coal quality assurance.
Contact our technical sales team today to request a quotation or discuss customized laboratory configurations tailored to your coal analysis requirements.
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