air pollution control
37
any gas, with the exception of inert gases, homonuclear serial ports to enable communication with in-the-field
diatomic gases and hydrogen sulphide. instruments and menu-driven control for ease-of-use.
As a multicomponent gas analyser, it is ideal for MT flowmeters are rack-mountable with card
customers that need to analyse multiple components, slots for expansion and future option modules. The
hot/wet gases, or any gas in complicated gas mixtures. flowmeters’ modular design and interchangeable
The Gasmet library of reference spectra consists components enable simple maintenance. The flow
of reference files of gas spectra measured to-date with element is made from stainless steel while the
different Gasmet gas analysers. The library contains electronics enclosure is rated to NEMA/CSA Type 4.
hundreds of spectra and each reference spectrum According to the company, MT multipoint
contains both quantitative and qualitative information flowmeters are ideal for measuring mass flow anywhere
about the component. that variables conditions limit the effectiveness of
Quantitech’s Dominic Duggan says that in single-point flowmeters. They can operate in harsh
comparison with multiple analyser CEMS, the FTIR is environments in the oil, gas and process installations
extremely easy to operate. “Zero point calibration with industries; and wherever temperature, vibration,
nitrogen (background) just takes a few minutes and is abrasion and corrosion pose difficulties for other
required once a day. Under normal circumstances no meters.
other calibration is required which saves users a great
deal of time, effort and money.
Analyser system
However, water vapour calibration must be Meanwhile, leading gas analysis company Servomex
performed after every major maintenance operation has highlighted how active the market still is with a
and at least once per year.” contract to supply a complete analyser system for a
Paul Conroy, development engineer with Scottish PTA plant being constructed by PetroquímicaSuape in
carbon fibre manufacturer SGL, explained: “The Ipojuca, Pernambuco, Brazil.
DX-4000 is a perfect instrument for us because we Contracted through Aker Solutions, a leading
need to simultaneously analyse a large number of global provider of engineering and construction
components which are created during the carbon fibre services, technology products and integrated solutions,
manufacturing process. Servomex will supply six SERVOTOUGH OxyExact
"We are also easily able to add different gases in (2200) oxygen analysers, six SERVOTOUGH
the future and modify the settings, which means that SpectraExact (2500) process analysers, sampling
we don’t have to upgrade equipment or buy a new systems and three TOC analysers to the new
instrument. We have also received excellent support PTA plant.
and guidance from Quantitech since we had the first The company also will oversee the design and
analyser installed two years ago.” build of two bespoke analyser houses, which will
include full HVAC systems to ensure a stable operating
ummarising the benefits of FTIR over environment as well as all internal plumbing and
S
traditional techniques, Dominic Duggan cabling required to monitor the gas streams and to
says, “The Gasmet FTIR systems that report data.
we have installed record a full analytical Designed to measure corrosive, toxic and flammable
spectrum for each measurement. This is important for sample streams, the SpectraExact series of photometric
three reasons; firstly, it enables the system to measure process analysers offers single or dual component gas
a wide variety of parameters with just one instrument; analysis to suit virtually any process, combustion or
secondly, it enables us to analyse old spectra in order emissions gas analysis application, while the OxyExact
to measure new parameters (that we did not need at utilises Servomex’s high specification paramagnetic
the time) and thirdly it is relatively simple to add new oxygen analyser for optimum process and safety control
parameters which is why we call it future-proof.” in general and high temperature applications.
Another company focusing on CEMS is Allison In combination the SpectraExact and OxyExact will
Engineering. Its new MT multipoint mass flowmeters provide a total, accurate and reliable solution for the
are designed for gas and air applications, making them monitoring of PTA processes for PetroquímicaSuape,
suitable for measuring and monitoring stack emissions. with both units offering a rugged, durable construction
Complaint with ISO 14164:1999 (E) Annex B, that makes it ideal for application in the volatile
they are designed for combustion air and flue gas environments of PTA production.
flow measurement and monitoring in large ducts with “Servomex is delighted to be chosen to supply a
irregular velocity flow profiles. total gas analysis solution to PetroquímicaSuape,” said
They can average up to 16 individual flow sensors md Chris Cottrell. “Not only are we pleased that our
at temperatures up to 450˚C and include a continuous excellent track record in PTA plants is recognised and
auto-test function with alarm diagnostics. valued, but also that we can demonstrate the same
Other features include averaging filters, which exacting high levels of service and support in our South
dampen response to rapid process fluctuations, RS232C American operations that we apply elsewhere.” v
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