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VarioClean - NO x Nozzle lances and systems for gas denitrification
VarioClean - NOxNozzle lances and systemsfor gas denitrification
L E C H L E R N O Z Z L E L A N C E S A N D S Y S T E F O R P E R F E C T I N G YO U R D E N I T R I F I C AT
LLechler is one of theworld's leading nozzle
technology companies.
In the more than
130 years of
our company's
history, we have
developed know-how
that brings you -
the user - tangible
advantages.
For denitrification
technology, Lechler
supplies advanced and
practical nozzle lances
and systems in
unbeatable quality, and
provides support from
a team of experienced
specialists.
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Temperature curve at various levels afterthe denitrification agent has been injected.
Droplet trajectories andchanges to the dropletdiameter after the denitrification agent hasbeen injected.
Nitrogen oxide emissionsmust be reduced
For industrial furnaces andcombustion plants, the limitvalues for nitrogen oxideemissions have been increasingly tightened up inrecent years. In addition to thecombustion-related primarymeasures, such as gradationof the combustion air and fluegas circulation, great importance is also attached toreducing the nitrogen oxidesby injecting in denitrificationagents.
Without these secondary measures, it would be difficultto achieve the limit values inforce today. In these processes, selectively-acting reducing agents suchas ammonia water or urea areusually injected into the fluegas. The success of thisprocess is to a great extentdependent on perfecting thenozzle technology employed.
CFD simulation provides reliability in project planning
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M S I O N P R O C E S S E S
SNCR process
The SNCR process is often used in refuse incineration plants, the cement industry and power stations.Here, the optimum temperaturerange in which the nitrogen oxidesare reduced at afavourable rate is approximately 900 to 1000 °C.
In addition to the temperature, the correctdroplet spectrum is alsoof particular importancefor ensuring that theprocess runs optimally:The droplets must be sufficiently large so thatthey penetrate sufficientlydeep into the flue gasflow and nevertheless stillevaporate reliably. Themost even distributionpossible of the reducingagent in the flue gas flowis also important.
Lechler twin-fluid flatspray nozzles meet theserequirements convincingly.Their high pulse rate andthe deep, flat coverage oftheir spray pattern allowoptimum mass transferbetween the reducingagent and the flue gasflow. As they are easily controllable, twin-fluidnozzles are optimally suited for the greatly fluctuating NOxconcentrations in cementworks and refuse incineration plants.
SCR process
The SCR process with injection isused mainly in power stations, butalso in refuse incineration and theglass industry. This involves injecting the reducing agent
upstream of the catalyst,whereby it must be distributed in the fluegas flow as homogeneously as possible and evaporatedvery quickly.
In practice, static mixersthat mix gas and the reducing agent are often used in addition tothe nozzles. This allowsextremely short evaporation paths at alow temperature level of approximately 300 to400 ºC.
It must be guaranteedthat the reducing agent is completely evaporated before itreaches the catalyst. To make sure of this, Lechler has developedtwin-fluid nozzles thatmeet these requirementssuperbly by virtue oftheir extremely finedroplet spectrum andtheir precise controllability, and thathave proved extremelysuccessful when usedin large power stations.
Lechler — your competentpartner in this specialistfield
The complexity of the task andthe stringent technical requirements come with manyrisks. Choose Lechler and youcan be sure of unsurpassedknow-how and perfect technology.
What this means for you:
n Greater efficiency thanks to optimum process-relateddesign aided by state-of-the-art CFD simulation.
n Precise measurement dataon the nozzles' spray characteristic are availablefor your own CFD calculations.
n Design, delivery, commissioning and serviceall from a single source.
n Reliable spare parts supplythroughout the world.
L E C H L E R P R O D U C T S P R O V E T H E M S E L I N M A N Y A P P L I C AT I O N S
Cement / calcinator – SNCR
SNCR process in a cementworks calcinator.
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Refuse incineration SNCR
SNCR process in refuseincineration plants.
n Optimum mass transfer between the reducingagent and flue gas, e.g. viatwin-fluid flat spray nozzles.
n Very good controllability of droplet size / pulse rateso that fluctuating NOxconcentrations can be counteracted.
Lance
Lance
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V E S
n Process for denitrificationdirectly in the kiln, includingmedia routing along the rotary kiln.
Cement / long kiln – SNCR
SNCR process in the longcylindrical rotary kilns of cement works.
SCR process in large powerstations.
Large power station – SCR
n New nozzle technology forvery short evaporationpaths (patent pending).
Zone 1
Injection active
Lance
Lance
Lance
Lance
Zone 3Zone 2
Lechler twin-fluid flat spraynozzles add to these properties with even better,complete coverage.
Lechler twin-fluid nozzles forSNCR plants atomize on thebasis of the internal mixingprinciple. Changing the air/liquid ratio allows the dropletspectrum and the pulse rate tobe adapted to the droplets. Arobust design and the correctchoice of materials allow useeven at high temperatures.
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L E C H L E R N O Z Z L E T E C H N O LO G Y F O R
LLechler nozzles for
gas denitrification are
the result of many
years of research and
development work.
Taking our specialist
knowledge from nozzle
technology as the
basis, this has seen the
development of special
solutions for use in
SNCR and SCR plants.
State-of-the-art design,
simulation and
measuring technology
ensures in advance
that the results will
meet your requirements
exactly.
Automated production
processes guarantee
maximum precision.
Lechler twin-fluid nozzles forSCR plants operate on theprinciple of a newly developedatomization principle for whichthe patent is pending. This allows very fine dropletspectrums and extremelyshort evaporation paths to berealised together with verygood controllability of the flowrate.
Cluster heads designed spe-cially for these nozzles allowmultiplication of the flow ratesand adaptation of the spraypattern to the requirements atthe injection location, e.g.upstream or downstream ofstatic mixers.
P E R F E C T S O L U T I O N S
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Lechler nozzle lances tai-lored exactly to your tasks
Lechler nozzle lances tailoredexactly to your tasks ensureoptimum placement andalignment of the spray patternin the flue gas duct. They aretherefore adapted precisely tothe particular denitrificationprocess and the individuallocal requirements – anotherreason for the high functionalreliability of the
Lechler technology. In practice, different design variants and special accessory parts often openup completely new possibilities. The following area few examples of this:
n Protective tubes with barrier air connection.
n Assembly connectingpieces with flange
connection for sealing intothe flue gas duct.
n Compensators for equalising different elongations.
n Adjustable lance length.
n Accessory sets for the media connection.
L E C H L E R N O Z Z L E L A N C E S
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Nozzle lance for SNCR applications (for installation in the wall of the gas duct)
Nozzle lance for SCR applications (for installation in the gas duct)
C O M P L E T E S O L U T I O N S
Pump and regulating unitsround off the program
Only when all components areoptimally tailored to eachother can a system make fulluse of its potential. That's whyLechler pump and regulatingunits are tailored very precisely to the process-specific requirements and thefunction of the nozzle lances.Preassembled, tested unitswith defined interfaces minimise the amount of installation and commissioningwork for you.
Ammonia water or urea solutions can be used withLechler pump and regulatingunits.
Many system variants, for example the distribution andexact dosing in various injection levels or taking into account special characteristicsof the plant, are possible. Consult our experts.
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Regulating unit
Pumping unit
Compact pump andregulating unit for installationin a container
Edition 05/12
· GB · 500 · LEC12085 · www.walliser-partner.de · S · Subject to technical modifications.
Lechler GmbH Precision Nozzles · Nozzle SystemsP.O. Box 13 2372544 Metzingen / GermanyPhone: +49 (0) 71 23 962-0Fax: +49 (0) 71 23 962-444
E-Mail: [email protected]: www.lechler.de
Over 130 years of practiceand experience have resulted in know-how of an international standard. Interdisciplinary teams ofprocess engineers, designersand production specialists areconstantly working to enhanceand optimise Lechler productsat our main works in Metzingen near Stuttgart.Worldwide, 10 subsidiarycompanies and over 40 branches and representatives provide on-site support for our customers.
We are happy to provide youwith support in commissioningand operator training, provided by our experiencedstaff.
China: Lechler Intl. Trad. Co. Ltd. · Beijing · Rm. 418 Landmark Tower · No. 8 Dong San Huan Bei Lu · Phone: (86) 1084537968, Fax: (86) 1084537458 · [email protected]: Lechler Oy · Posliinitehtaankatu 7 · 04360 Kerava · Phone: (358) 207856880 · Fax: (358) 207856881 · [email protected]/Belgium: Lechler France, S.A. · Bât. CAP2 B51 · 66-72, Rue Marceau · 93558 Montreuil cedex · Phone: (1) 49882600 · Fax: (1) 49882609 · [email protected] Britain: Lechler Ltd. · 1 Fell Street, Newhall · Sheffield, S9 2TP · Phone: (0114) 2492020 · Fax: (0114) 2493600 · [email protected]: Lechler (India) Pvt. Ltd. · Plot B-2 · Main Road · Wagle Industrial Estate · Thane (W) - 400604 · Phone: (22) 40634444 · Fax: (22) 40634497 · [email protected]: Lechler AB · Spärrgatan 8 · SE-653 41 Karlstad · Phone: (46) 54137030 · Fax: (46) 54137031 · [email protected]: Lechler S.A. · Avda. Pirineos 7 · Oficina B7, Edificio Inbisa I · 28700 San Sebastián de los Reyes, Madrid · Phone: (34) 916586346 · Fax: (34) 916586347 · [email protected]: Lechler Inc. · 445 Kautz Road · St. Charles, IL. 60174 · Phone: (630) 3776611 · Fax: (630) 3776657 · [email protected]
