IMO NOx Tier III technology for UE Engine

HP-SCR system

Mar. 2023
Japan Engine Corporation© 2023 Japan Engine Corporation

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WMS-H861

Mar. 2023

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NOx emission control area（ECA）
The emission regulations of IMO for NOx and sulfur content in fuel are getting strict year by year.
As for the NOx regulation, from 2011 Tier II regulation is in effect.
As the result of MEPC66, from 2016 Tier III regulation became into effect.
Its level is over 75% less than that of Tier II inside of ECA. Outside of ECA its emission level issame as Tier II.

＜NOx-ECA＞（2021～）

Existing ECA© 2023 Japan Engine Corporation

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WMS-H861

Mar. 2023

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1. NOx Tier

IMO NOx Tier III Solutions

UEC engine complies with IMO NOx Tier III regulation

by LP-EGR, HP-SCR or LP-SCR system, which has the enough ability
to reduce NOx emission for the regulation.

①METHODS IN-ENGINE- EGR (Exhaust Gas Recirculation)②AFTER TREATMENT- SCR (Selective Catalytic Reduction)© 2023 Japan Engine Corporation

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Contents
1

Overview of HP-SCR

2

Maintenance in Service© 2023 Japan Engine Corporation

Confidential 複写・転載禁止

WMS-H861

Mar. 2023

Unauthorized reproduction and copying prohibited4Configuration of HP-SCR system
PROVISIONAL

HP-SCR system is closely controlled in conjunction with theoperating conditions of the engine.

3Mixingunit

2

BoilerSCR
Reactor

6ECP

4

SAV (At Tier2)

1

C/R

Urea water tank

Dosing unit

RSV-1

Engine Room

AUS40

Pump unit

5
SCR Control unit

BurnerExh. gas manifold

SBV

RSV-2

RBV: Engine Builder scope: Compressed air line
: Urea water line

EGBV

EGBV: Exh. gas bypass valve
RSV: Reactor sealing valve
RBV: Reactor bypass valve
EGV: Exhaust gas outlet valve
SBV: Soot blow valve
SAV: Seal air valve
ECP: Eco engine Control Panel※Urea water tank : Shipyard scope

EGVScav. Air receiver
UE engine© 2023 Japan Engine Corporation

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5Arrangement of HP-SCR system components (for reference)
HP-SCR system components are located near the main engine for closelycontrol and exhaust gas exchange.

PROVISIONAL

Mixing unit

SCR reactor
with soot blower© 2023 Japan Engine Corporation

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Mar. 2023

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6

Contents
1

Overview of HP-SCR

2

Maintenance in Service© 2023 Japan Engine Corporation

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WMS-H861

Mar. 2023

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Maintenance of LP-SCR in service
Maintenance interval
3monthsDe-nitration
Performance(Spot Check)

Catalyst(Replacement of Catalyst)

6months

12months

Remarks
18months

36months

60
monthsNOx measurement every
12 months✔

✔

Dosing unit

(Replacement of SolenoidValve, etc.)

SCR control
panel(Replacement of Board)

Replaced when SCR
operating time reaches
10,000hrs or 5 years after
first use, whichever comes
first✔
✔

In addition to the above, there are inspections of electrical components and filters,
but it is not always necessary to replace them, and they will be replaced according
to the inspection status.
© 2023 Japan Engine Corporation

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WMS-H861

Mar. 2023

Unauthorized reproduction and copying prohibited8Spot Check (1)Because of denitration performancein service, SCR should be carried out
annual spot check.
It is described in Resolution
MEPC. 291 (71) Chapter

The NOx emission will be measured /analyzed in two sampling connections ofexh. gas piping.

Sampling connection

1) NOx emission after engine outlet
2) NOx emission after SCR reactor© 2023 Japan Engine Corporation

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Unauthorized reproduction and copying prohibited9Spot Check (2)〈 Representative portable NOx analyzer (Testo350 Maritime) 〉

 For spot check of LP-SCR, the below
items should be prepared and used.
1) Low sulfur fuel oil under S 0.1%
and less (LSMDO, LSMGO)
2) 32 or 40% Urea solution*(AUS32 or 40)3) NOx analyzer

Portable NOx analyzer is available
for spot check.
(e.g. Testo350 Maritime, etc)*: The concetration of usable urea solution
depends on SCR specification.
Source: photo supplied by Testo K.K© 2023 Japan Engine Corporation

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10Thank youJapan Engine Corporation
1, Minamifutami, Futami-cho, Akashi,

Hyogo Pref., 674-0093, Japan
www.j-eng.co.jp© 2023 Japan Engine Corporation

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WMS-H861

Mar. 2023

Unauthorized reproduction and copying prohibited11