Infrared Sulfur Analyzer for Coal and Coke

What is the Infrared Sulfur Analyzer for Coal and Coke?

An infrared sulfur analyzer burns a gram-scale coal, coke or solid fuel sample at 1150–1350 °C in oxygen and measures the SO2 formed by non-dispersive infrared absorption. It gives total sulfur in coal, coke and biomass within minutes for trading, blending and emission-control decisions.

Overview

A sample of 0.1–1 g is weighed into a ceramic boat, covered with a combustion aid such as vanadium pentoxide where needed, and pushed into a tube furnace at 1250–1350 °C with oxygen flow. Combustion gases pass through dust removal and dehydration to an infrared cell measuring SO2 absorption near 7.3 µm. Total sulfur is computed from integrated signal and sample mass against calibration with coal standards of known sulfur. The dedicated design handles high-ash solid fuels more robustly than chemical methods, and measurement time is 3–5 minutes against hours for Eschka gravimetry. Results are reported in percent, with options to report on air-dried, dry or dry-ash-free basis when moisture is entered. Calibrations are routinely checked with certified coal standards.

How does it work?

Elemental analyzers convert the element of interest into a simple gas at high temperature and then measure that gas. In combustion analysis, a sample burns in oxygen at 900–1350 °C, converting carbon to CO2, hydrogen to H2O, sulfur to SO2 and nitrogen to N2 or NOx. Gases are separated by chromatographic column or selective traps and detected by non-dispersive infrared cells, thermal conductivity detectors or chemiluminescence. Inert gas fusion heats a sample in a graphite crucible under helium to release oxygen as CO, nitrogen as N2 and hydrogen as H2, again measured by infrared and thermal conductivity. Induction furnaces heat metals and ores with accelerators such as tungsten and tin. Calibration uses certified standards of known composition.

What are the key features?

• Tube furnace operating up to 1350 °C for complete sulfur release from coal ash
• Non-dispersive infrared SO2 cell with temperature-stabilized optics
• Automatic boat loader for sequential batches of solid fuels
• Dust trap and dehydration unit protecting the infrared cell
• Result reporting on air-dried, dry and dry-ash-free bases
• Calibration storage for coal, coke and biomass matrices

What are the technical specifications?

A typical infrared sulfur analyzer for coal and coke configuration offers sulfur range of 0.01–10% (m/m), sample mass of 0.1–1.0 g, furnace temperature of 1150–1350 °C, detector of Non-dispersive infrared (SO2), analysis time of 3–5 min and repeatability of ≤ 0.02% absolute (below 1% S). Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Infrared Sulfur Analyzer for Coal and Coke is used in total sulfur in thermal and coking coal, sulfur in coke and petroleum coke, sulfur in biomass and solid recovered fuel, coal blending and delivery acceptance and fuel compliance for power plants. Across the wider Elemental Analyzers class, laboratories also deploy it for carbon and sulfur in steel and ores, oxygen, nitrogen and hydrogen in metals and alloys and ultimate analysis of coal and coke.

Which standards and certifications apply?

Relevant standards and methods include ASTM E1019, ASTM E1409, ASTM D5373, ASTM D5453, ASTM D4239, ISO 15350, ISO 10694 and IEC 61010-1. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Elemental analyzers need clean, dry, high-purity gases, typically oxygen and helium or argon at 99.995% or better, with regulators and moisture traps. Condition new combustion tubes, catalysts and reagents according to the manual, and replace them on a usage schedule. Run blanks and conditioning samples at start-up, then calibrate with certified standards that match the expected concentration range, such as acetanilide for CHN or steel standards for C and S. Control dust by cleaning the furnace and filters frequently, especially for ore and coke samples. Check for gas leaks regularly, weigh samples on a balance with suitable readability, and keep crucibles pre-ignited and free of contamination.

How do I select the right Infrared Sulfur Analyzer for Coal and Coke?

Select this variant when total sulfur in coal, coke or solid fuel is the main parameter and speed matters. Choose a CHNS analyzer for a full ultimate analysis. In an RFQ, state sulfur range, sample types, daily samples, autoloader need, oxygen supply and standards such as ASTM D4239 or ISO 351.

How does it compare with other Elemental Analyzers variants?

Select by element set and sample form. Carbon and sulfur in steel, ores, cement and ceramics point to a high-frequency induction furnace with infrared detection. Oxygen, nitrogen and hydrogen in metals call for an inert gas fusion analyzer. Organic samples requiring C, H, N, S and possibly O suit a CHNS/O dynamic-flash combustion analyzer. Sulfur or nitrogen at mg/kg levels in liquid fuels suit UV-fluorescence or chemiluminescence analyzers. Check measuring range, since percent-level and ppm-level analyses need different detector ranges. Consider sample throughput, autosampler capacity, consumables such as crucibles, anhydrone and catalysts, and the standard methods to be met, such as ASTM E1019 or ASTM D5453.