Wrtsil NO X Reducer Wrtsil NO X Reducer Environmental Efficiency - - PDF document

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Wrtsil NO X Reducer Wrtsil NO X Reducer Environmental Efficiency - - PDF document

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Wrtsil NO X Reducer Wrtsil NO X Reducer Environmental Efficiency June 2011 Environmental efficiency Stringent legislations concerning NO X. Retroactive legislations are introduced. Regulations in the shape of fees, taxes or

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SLIDE 1

Wärtsilä NOX Reducer Wärtsilä NOX Reducer

Environmental Efficiency

June 2011

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SLIDE 2

Environmental efficiency

  • Stringent legislations concerning NOX.
  • Retroactive legislations are introduced.
  • Regulations in the shape of fees, taxes or

incentive programs are brought on from many parties including individual countries that have parties, including individual countries that have introduced fairway dues, NOX tax or NOX fund initiatives.

June 2011

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SLIDE 3

Revised Marpol Annex VI Regulation 13

16 18 NOX (g/kWh) Primary methods operation area

Tier I >130 kW New ships 2000

10 12 14 Primary methods operation area

Tier II >130 kW New ships 2011 Tier III >130 kW N hi 2016 i

4 6 8 Wärtsilä NOR

  • peration area

Secondary methods operation area

New ships 2016 in designated Emission Control Areas (ECA)

2 200 400 600 800 1000 1200 1400 1600 1800 2000 Rated engine speed (rpm)

June 2011

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SLIDE 4

NOX formation and reduction

  • Nitrogen Oxides (NOx) are formed

g (

x)

during the combustion process from

  • xygen (O2) and nitrogen (N2) in air.
  • The NOX Reducer SCR catalyst

converts NOX molecules back to harmless O2 and N2 molecules by

2 2

y means of urea.

June 2011

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SLIDE 5

NOX reducer – description

  • The Nitrogen Oxide Reducer (NOR) is designed by Wärtsilä and is

b d l ti t l ti d ti (SCR) t h l Th NO based on selective catalytic reduction (SCR) technology. The NOX reducer portfolio covers Wärtsilä’s medium-speed engine portfolio for marine applications.

  • The size of the NOX Reducer is optimised in terms of modularity,

performance and costs. The typical NOX emission reduction is 90 %.

  • The main component of the NOX reducer installation is the reactor with

the catalyst inside. Other modular essential parts of NOR system are a reagent pumping unit a reagent dosing unit a control unit and an reagent pumping unit, a reagent dosing unit, a control unit and an injection unit.

June 2011

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SLIDE 6

NOX reduction functional principle (SCR)

Nitrogen oxides (NOX) are reduced into nitrogen (N2) and reduced into nitrogen (N2) and water vapour (H2O) using ammonia or urea at a suitable t t th f f th temperature on the surface of the catalyst.

Operating temperature ~ 300 – 450 °C 300 450 C

June 2011

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SLIDE 7

Minimum recommended temperature in the SCR inlet vs fuel sulphur content

June 2011

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SLIDE 8

Catalytic elements

Proven catalytic elements for marine applications. y pp

June 2011

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SLIDE 9

NOx Reducer layout

Control system cables

NOR reactor Soot blowing

Compressed air Urea piping

Compact unit (dosing & control) Urea tank Compressed air Injector Urea tank Injector Pump unit

June 2011

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SLIDE 10

Wärtsilä NOR system overview

Dosing / Dosing / Dosing / Dosing / Control unit Control unit Control unit

June 2011

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SLIDE 11

Main components – Reactor

  • Wide range of sizes designed for

various customers’ needs. various customers needs.

  • High level of standardization and

modularisation.

  • Reactor structure optimized for marine

applications.

  • Reactor can be run without reagent

Reactor can be run without reagent injection, only soot blowing remains in

  • peration; no by-pass is required.

S t bl i i l t l t d

  • Soot blowing inlets are located on
  • pposite reactor walls for ensuring

efficient cleaning which covers the h l l t f whole element surface area.

June 2011

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SLIDE 12

Main components – Urea injection and mixing

  • The injection unit feeds the optimum amount of

urea solution with air to the mixing duct g

  • Mixing duct gives the necessary time for urea

to evaporate, decompose and mix with p , p exhaust gas

  • Appropriate mixing duct arrangement ensures

pp p g g uniform flow around the injector to obtain homogeneous distribution of ammonia into the flow

  • When turned off, the injector is automatically

purged by compressed air from urea solution in order not to have urea deposits in it in order not to have urea deposits in it.

June 2011

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SLIDE 13

Main components – Urea pumping unit

  • The pumping unit supplies urea solution to multiple dosing units
  • In large multiple engine installations it is possible to simply increase the number
  • f pumps in order to deliver the desired amount of urea
  • All piping is made of stainless steel
  • Preferably accommodated close to the urea tank

June 2011

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SLIDE 14

Main components – Urea dosing unit

  • Defines the correct dosing rate and adjusts

urea flow accordingly with a control valve.

  • Combines the control of urea solution

d d d i ith t ti dosage and compressed air with automatic injector cleaning features.

  • All piping is made of stainless steel.
  • An independent dosing unit for each NOR

reactor.

  • Recommended to be installed close to the

urea injector.

June 2011

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SLIDE 15

Main components – Control system

  • The control system is a part of the

dosing unit g

  • Controls the NOR operation by

monitoring engine parameters monitoring engine parameters

  • Integrated interface to the engine

automation system automation system

  • Hardware and software commonality

with the engine automation system UNIC platform

  • Soot blowing control and safety features

are included

June 2011

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SLIDE 16

Wärtsilä NOR performance

  • High activity over a wide temperature

range g

  • Efficient SCR process
  • Durable catalyst against ageing and

erosion erosion

Performance NOx emission levels as per IMO Tier III* Urea consumption Typically 15-20 l/h / MW p yp y Operation Fuels: MGO / MDO / HFO with <1.0 % S content (higher sulphur content possible upon request) ( g p p p q ) NOR delivery means ensuring the compatibility of the NOR system with the engine. *at sufficient high exhaust temperature conditions

June 2011

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SLIDE 17

Selection of NOR reactor for Wärtsilä engines

  • NOR reactor is selected according to engine power.

June 2011

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SLIDE 18

NOX reducer system – typical consumables

  • Reducing agent
  • Compressed air for reducing agent injection and soot blowing

Compressed air for reducing agent injection and soot blowing

  • Electricity (~1 kW per NOR unit)
  • Catalytic elements

TYPICAL COST DISTRIBUTION

June 2011

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SLIDE 19

NOR Benefits

Owner Benefits Shipyard Benefits

  • Quality and functionality guaranteed

by Wärtsilä C t l t lit f

  • Fully integrated supply by
  • ne supplier

P ibl i t ti ith i

  • Control system commonality for

NOR and the engine

  • Complete system user manual
  • Possible integration with noise

attenuation system

  • Single point responsibility
  • Complete system user manual
  • Catalyst system components and

service available by Wartsila

  • Single point responsibility
  • Quick installation due to pre-

fabricated and -tested modules y worldwide

  • Training courses
  • Start up and commissioning
  • Calibration expertise
  • Short delivery time

June 2011