The Linde Group is a world-leading supplier of industrial, process and speciality gases, and its products and services can be found in nearly every industry - in more than 100 countries.
International accords such as the Montreal protocol, or Kyoto accords call on all industries to monitor, control and reduce emissions before discharging them into the environment. There are a number of different particulates and gaseous emissions that result from smoke stack emissions in power generation industries. Legislation requires power-generation facilities to monitor for an increasing number of compounds at lower levels.
HiQ environmental calibration gas mixtures and instrument gases are used to zero and calibrate a variety of gas chromatography detectors such as a flame ionisation detector (FID), photo ionisation detector (PID) and electron capture detector (ECD) along with gas-specific sensors for low levels of acid rain and greenhouse-gas emissions. These calibration-gas mixtures can be used for ambient-air monitoring in locations remote from the emissions, or continuous-emission monitoring at smoke-stake where the emissions take place. The portable cylinder ECOCYL can be the complete and convenient package for gas detection and remote calibration. To measure contaminants such as nitric oxide, nitrogen dioxide, carbonyl sulphide, hydrogen sulphide, carbon monoxide and sulphur dioxide, SPECTRA-SEAL calibration mixtures offer flat-line stability during the use of the mixtures in a wide variety of calibration standards - down to parts-per-billion levels.
ISO-accredited calibration standards are also used to ensure accuracy and traceability with emission trading scheme verification and traceable reports. To reduce the emissions of contaminants such as nitric oxide, selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) technologies can be used. SCR converts nitric oxides into diatomic nitrogen and water with the acid of a catalyst; while during the SNCR process, either ammonia or urea is used as the reductant to have the chemical redox reaction with the nitric oxide, resulting diatomic nitrogen, carbon dioxide and water.
Speciality equipment for special applications
Complex industrial processing and instrumentation demand products of the highest quality maintain peak performance. Distribution systems for speciality gases must meet increasing demands for optimal standards of performance, new analysing methods and production refinements. Impurities occurring in just a few parts-per-million can have serious consequences to the end users' applications. The demands made on regulators and valves in these environments are extremely high. Therefore, highly durable, high-standard HiQ speciality equipment and installations are essential for the reliable supply of these calibration-gas mixtures.
Gas-handling equipment functionality is critical and must be suited to the sophisticated gas being handled. This encompasses factors such as pressure-reducing regulators and purge functionalities. Materials of construction are once again critical to the integrity of the distribution system, particularly where speciality gases contain corrosive components. Joints, seals, moving parts and fittings in regulators and valves must be absolutely tight and impermeable - more so than for the equipment used to supply industrial and medical gases.
In these applications, the term "helium leak tightness" is often used to determine leak potential - referring to how much helium will leak out within one second under certain circumstances from the inside of the system to the outside. Typically, with industrial and medical equipment, 1cm3 of helium could leak within an hour from a component. On the other end of the scale, other gas distribution systems might display far better leak rates, capable of maintaining their integrity up to and even far beyond 30 years for the loss of 1cm3 of helium.
HiQ speciality equipment is designed to maintain the integrity of your speciality gases between the cylinder and the instrument or process. After all, the quality of your gas can only be as good as your gas supply system.