Established in 1938, Carbolite has become aleading international manufacturer of quality thermal

equipment,producing awide range ofmodels forquality control,specialisedresearch, pilotplant andproductionprocesses.

In particularthe furnacesand ovensdesigned forcoal and coketesting and

iron ore evaluation, have become established as thestandard equipment used in coal laboratories,power plants and steelworks throughout the world.

The range includes bench top laboratory models forroutine testing and large pilot plant scale products,some of which are unique to Carbolite, such as thevariable width hearth moving wall coking oven whichcan be found in coal research facilities as well aslarge steel producing plants around the world.

Carbolite operates a quality management systemand has obtained accreditation to ISO 9001. Inaddition all products carry the CE mark whichindicates compliance with all relevant Europeansafety directives, i.e. low voltage directive andelectromagnetic compatibility directive.

All products are also manufactured in compliancewith the relevant safety standards to BS EN 61010-1:1993 and 61010-2-010:1995.

Where applicable the specialist range of ovens andfurnaces also conforms to international standards

and other defined test procedures, including ASTM,BS, JIS, DIN and ISO.

Our team of installation and commissioningengineers is supported by trained technicians fromour world-wide network of distributors who alsoensure availability of critical spare components andconsumables.

laboratory products

ASHING FURNACES The OAF furnaces aredesigned for ashing coal samples and have amaximum operating temperature of 1100°C. TheOAF11/1 has a large floor area which allows manysamples to be accommodated and because of thelow chamber height, the air flow is held close overthe samples to promote burning. The traditionalmuffle heated chamber is extremely durable, givinggood resistanceto abrasion andto vapourattack. Good airflow is ensuredby naturalconvectionthrough a tallchimney andprovides 4-5 airchanges perminute. Theinlet air is pre-heated before itenters the heatedchamber ensuringthat crucibles located near the inlet are not chilled.A larger unit OAF 11/2 provides twice the capacity inan upper and lower chamber.

A three term microprocessor controller with a digitalreadout is fitted as standard and programming

introduction

Discharge of coke from a variable width movingwall coking oven.

1100°C single chamber ashing furnace, twinchamber also available.

facilities can be incorporated as an option.Both furnaces comply with the following industrystandards: BS 1016, Part 4, ISO 344 & 1171, ASTMD2361, D2795 & D3174

VOLATILE MATTER FURNACES Two modelsare available to meet the different test methods ofISO 562 and ASTM D3175.

The model VMF 10/6 meets the requirements of ISO562 and is a chamber furnace with a maximumtemperature of 1000°C. Chamber size is100 x 200 x 210 mm (HWD) and external dimensionsof 655 x 435 x 610 mm (HWD). Powerful open spiralheating elements, supported in lightweight ceramicfibre insulation give fast heating. A sophisticatedalgorithm in the digital temperature controllerensures fast recovery of temperature after loadingthe samples - less than 4 minutes to return to 900°C± 10°C. The uniform zone of 80 x 160 x 160 mm(HWD) is within ± 10°C measured at 900°C.

The furnace available to meet the ASTM standard isa top loading furnace to accept a single cruciblewhich is suspended into the vertical work tube of 50mm diameter x 100 mm depth. A controlthermocouple is placed directly under the crucibleand the furnace is offered with a choice of digital

PID temperaturecontrollers. Externaldimensions are 330x 410 x 300 mm(HWD).

MINIMUM FREESPACE OVEN(MFS)The oven is availableas a single chamberor a multiple unitwith four separatechambers. It isdesigned for the

determination of moisture in coal by drying in anitrogen atmosphere, as described in BS 1016: Part104. The oven measures the flow of nitrogen whichis required to pass through the chamber atapproximately 15 oven volumes per hour. Innerchamber dimensions are 25 x 195 x 290 mm (HWD).A choice of digital PID temperature controllers isavailable and desiccators are an optional extra.

SWELLINGNUMBER INDEX(SNF) A top loadingfurnace has beendesigned for use inthe test for thedetermination of thecrucible swellingnumber of coalsamples as describedin BS 1016: Part 107and ISO 501.

Maximum temperatureis 900°C and chamberdimensions of 55 mm diameter x 85 mm deep. Achoice of digital PID temperature controllers isavailable with overtemperature protection as anoptional extra.

COAL ASH FUSIBILITY FURNACE Carbolitehas a range of furnaces which conforms to ASTMD1857-68 and BS 1016: Part 113 to determine theprecise fusion stages required in the standard test.

The CAF/Video model with a maximum operatingtemperature of 1550°C can accommodate up to 12sample cones with ease at a single loading. Theadvantage of lightweight insulation allows fastcooling, and up to 36 samples can be processed ina day with little supervision. The video systemenables the test to be observed and recorded and adigital temperature reading, date and batch numberare displayed on the screen and tape. The test cycleMinimum Free Space Oven (MFS/1).

Swelling Number Index (SNF).

can be pre-set, including automatic gas switchingwhich minimises operator supervision.

A new digital imaging version is also availableallowing digital pictures to be viewed more quicklyand monitoring can be performed remotely via a PC.

For laboratories where a small number of samplesare processed a manual version is available whichrequires visual observation of the sample via atelescope. Model type CAF 16/38 has a maximumtemperature of 1600°C.

Detailed specifications are available and specialversions can be manufactured up to 1700°C.

SULPHUR & CHLORINE CONTENTCombustion tube furnaces with a maximumoperating temperature of 1400°C are designed forsulphur and chlorine content tests in accordancewith BS 1016: Part 6 & 7; ASTM D3177-75; ISO 351& 609. These models accept work tubes of 38 mmwith a heated length of 180 mm.

Single, two or four tube versions are available.

CARBON AND HYDROGEN CONTENTTESTS The above furnace with the addition of anauxiliary heater is offered as a single or twin tubefurnace for this test.

Other, less frequently used furnaces aremanufactured to special order and include theGray King coke test furnace, Leibig (lowtemperature) method for determination of carbonand hydrogen in coal.

Digital CAF furnace.

CAF video furnace.

1400°C Combustion tube furnace

The following products comprise the range of largerunits and are separately detailed on individualspecification data sheets.

MOVING WALL COKING TEST OVEN Theoven rated at 1250°C is designed for testing suitablygranulated and graded coals for coking underaccurately controlled conditions. The oven isdesigned to allow pressure generated during the

coking to be exerted against a fixed wall on one sideof the chamber and a moving wall on the other. Thispressure is measured by a load transducer actuatedby the moving wall. The recommended width of theoven is 455 mm with a nominal charge weight of 255(kg-dry basis). Other widths are available requiringadditional hearth plates and doors.

Many optional extras are often requested, includingcharge hoppers and trolleys, quench carts,discharge ram, etc. A separate control cabinethouses all instrumentation.

COKING TEST OVENS Two standardcarbonisation ovens are included in the range tocoke coal or coal blends under controlled

conditions. The CTO/15 has a capacity of 7 kg witha typical cycle time of 1.5 hours and a maximumoperating temperature of 1300°C. A larger unit -CTO/500 has a capacity of 227 kg and a maximumoperating temperature of 1250°C with a maximumrate of rise of temperature from 750°C up to 1250°Cof 20°C per hour.

SOLE HEATED OVENS Both single and doublechamber versions are included in the range and aredesigned to measure the expansion and contractionof coal and coal blends when heated under aconstant load. Maximum operating temperature is

Coking test oven.

Moving wall test oven.

Double sole heated oven.

pilot plant equlpment

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CarboliteAston Lane, Hope, Hope Valley S33 6RE, EnglandTel: (01433) 620011 Fax: (01433) 621198

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D I S T R I B U T E D B Y :

1000°C.VERTICALLYSPLITCOKINGOVENThe furnace isdesigned tomeasure wallpressure duringcoking and alsothe temperature

at the centre of the charge and variation in chargeheight during coking. The results obtained will be anapproximate average of the larger scale moving wallcoking oven but not an accurate simulation.

IRON ORETESTlNGVarious teststandards areused in the testingof iron ores.

Carbolite hasmanufacturedfurnace test rigsfor many of theseprocedures andall are fullydocumented oncomprehensivespecification

data sheets. Please request further information.

They include:

● determination of reducibility of iron oresaccording to ISO 4695: 1995 (E) - JISM 8713 -ASTM/E 1071-89.

● Low temperature disintegration test - methodusing cold tumbling after static reductionaccording to ISO 4696: 1984 (E).

● Determination of relative free swelling indexaccording to ISO 4698: 1994 (E).

● Determination of reduction properties under loadaccording to ISO 7992: 1992(E)

● Linder Test. Low temperature breakdown test ofiron ore, generally in accordance with ISO 4697.Iron ore pellets are placed into a heat resistantrotating tubeand subjectedto a tumblingaction whilstheated in areducingatmosphere.The samplesare thensubjected to astove analysisto determinethe degree ofdisintegration.

NB: when requesting quotations for reducibility testequipment, it is essential to specify the standard towhich you are working.

COKE REACTIVlTY TEST EQUIPMENTCarbolite produces furnace test rigs according tothe method defined by the ASTM D 5341-93a. Withinthis standard there are two tests:Coke strength after reduction (CSR)Coke reactivity index (CRI)

Again it is important to specify the exact standardrequired especially because of variations with othernational standards.

COAL DRYlNG OVENS Two models suitable fortesting as defined by BS and ASTM methods are:-Model CDLT which conforms to BS 1017: Parts 1 &2 and ASTM 3320. Model CDHT conforms to BS1016: Parts 1 & 2 and ASTM 2961.

Linder test rig.

Iron ore reducibility test rig.

Vertically split coking oven.

NEW HORIZONS INTEMPERATURE TECHNOLOGY

coal, coke &iron ore

testing furnaces

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NEW HORIZONS INTEMPERATURE TECHNOLOGY