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Wartsila-O-Env-IMO-Tier-III-SCR - 12 Pages

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Catalogue excerpts

IMO TIER III SOLUTIONS FOR WÀRTSILÀ 2-STROKE ENGINES - SELECTIVE CATALYTIC REDUCTION (SCR)

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THE REVISED MARPOL ANNEX VI The Revised MARPOL Annex VI brings new requirements for marine diesel engines – in particular, the new Tier III standard for NOX emissions requires a step change in technology. The further developments in terms of SOX emissions control, outlined in the same agreement, represent important boundary conditions in this context. Following an overview of potential options for dealing with this challenge, the Wärtsilä SCR solution is presented as a first, readily available approach for achieving compliance with IMO Tier III for Wärtsilä 2-stroke engines. 2 The Revised MARPOL...

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Tier II: since 1.1.2011, global after 2016, outside emission control areas Tier III: after 2016, inside emission control areas Figure 1: NOX emissions limits according to the Revised MARPOL Annex VI. 5 Fuel sulphur content, % 4.5 Global 4 3.5 3 2.5 2 1.5 ECA 1 0.5 0 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Year The introduction of the global 0.5% limit is made conditional on the outcome of a review to be completed by 2018. The purpose is to assess the availability of fuel oil in accordance with this requirement on the basis of the global market supply and demand situation...

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Figure 3: Possible combinations of NOx and SOx control technologies. Figure 4: Fuel consumption characteristics of various Tier II tuning variants of RT-flex engines and the corresponding RTA version (58T-D example). r^Tierll limit Weighted average Figure 5: NOx emissions characteristics of Tier II compliant engines according to verification test TECHNOLOGY OVERVIEW In order to achieve compliance with both the IMO Tier III NOx standards and the requirements for SOx control, a variety of solutions Is theoretically conceivable, starting with the choice of fuel and fuel system, Including conventional...

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SCR technology have to be considered. So far only SCR has demonstrated its capability to achieve the target NOX reduction in a reliable and repeatable way as a standalone technology. Other technologies may have the theoretical potential to realize Tier III levels. However, it is highly probable that in practice, combinations of two or more of these technologies are necessary in order to achieve compliance at optimum general performance and for minimum total lifecycle cost. SCR – GENERAL CONSIDERATIONS SCR technology is based on the reduction of nitrogen oxides by means of a reductant (typically...

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ECONOMICAL CONSIDERATIONS Based on considerations of the potential of individual technologies, various possible solutions for achieving the Tier III compliance target can be identified, either as standalone measures (specifically SCR) or by combining several, compatible technologies. Those combinations could e.g. consist of simple superposition of individual technologies, but also be based on advanced integration, such as realized in the WaCoReG concept. This combines exhaust gas retention in the cylinder (sometimes also referred to as internal EGR) with direct water injection, but designed in...

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minimizing the sensitivity of the SCR and engine combination to fuel composition: On the one hand, the selection of catalyst type and material must be considered essential; on the other hand, the SCR unit needs to be properly integrated with the engine for minimizing heat losses and achieving optimum distribution of the reductant. Finally, the deactivation of the catalyst by means of deposits building up – as well as the potential ageing of the catalyst through small amounts of catalyst poisons included in such deposits – must be counteracted by applying a soot blowing system, which is also needed...

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DOSING UNIT (1) Compressed air inlet (2) Air filter (3) Solenoid valve (4) Air pressure regulator (5) Urea inlet (6) Drain (7) Flow control valve (8) Flow meter Figure 8: Flow diagram of the dosing unit. The dosing unit controls the dosing of reducing agent to the injection system. Figure 8 shows a schematic flow diagram of this unit. The components in the unit are mounted on a module frame. In addition to the equipment for dosing of reducing agent, the unit includes components for compressed air regulation. The flow of reducing agent is regulated by an automatic control valve. A flow meter measures...

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SCR REACTOR WITH SOOT BLOWING SYSTEM The reactor is a steel casing containing an adequate number of catalyst elements, typically of the honeycomb type and arranged in multiple layers, in order to achieve the necessary conversion. As the exhaust gas flows past the catalyst surface, the nitrogen oxides react with the reducing agent. Compressed air connections for soot blowing are installed at each catalyst layer. The reactor is equipped with a differential pressure transmitter for monitoring the condition of the catalyst elements, and a temperature transmitter for monitoring the exhaust gas outlet...

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Figure 13: Pre-turbine SCR installation on Wärtsilä 7RT-flex40 engine. INSTALLATION DIMENSIONS INDICATIVE SCR SYSTEM MAIN DIMENSIONS FOR SELECTED WÄRTSILÄ 2-STROKE ENGINES Engine 6RT-ex50D Power SCR reactor SCR reactor Mixing duct Mixing pipe kW @100% diameter length diameter length MCR (a) mm (b) mm (c) mm (d) mm 10 470 1900 4200 900 4700 7RT-ex58T 15 820 2200 4000 1100 5200 8RT-ex68D 25 040 2700 4800 1400 6100 7RT-ex82T 31 640 3000 5000 1700 6600 The main challenge with two-stroke marine installations is related to the need for integration of the SCR between exhaust manifold and the turbocharger,...

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50 time of certification. It can take the form of either engine family or group or even single engine approval, with the engine family concept only applicable in cases where the complete engine and SCR system can be tested on the testbed. The scope of additional tests onboard depends on the type of certification chosen. SCR budgetary price, €/kW 40 35 30 25 20 15 10 WÄRTSILÄ EXPERIENCE AND REFERENCES 5 0 10.000 20.000 30.000 40.000 50.000 60.000 Engine power, kW Figure 15: SCR budgetary price, €/kW. INSTALLATION COSTS The Wärtsilä SCR delivery scope can vary depending on the needs and preferences...

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