Japan’s comment onTier III NOx Review Correspondence Group (NOx-CG) - Round 1
 Term of Reference 1:
Consider range of technologies (engine fitting, material, appliance, apparatus, otherprocedures, alternative fuels or compliance methods) that may be used to comply with theTier III NOx standards;
 Questions for consideration:
Q1: What is the practical capability of each of these technologies for compliance withthe Tier III NOx standards?
Answer:Regarding SCR using urea and ammonia as reductant, it is considered highly feasible
for compliance with the Tier III standards. For reference, the principle of SCR
denitration equipment and its system conceptual diagram are shown in Attachment 1.

Q2: What other technologies (engine fitting, material, appliance, apparatus, otherprocedures, alternative fuels or compliance methods) should also be considered aspart of this review?
Answer:---- (blank)

Q3: What is the status of development of these technologies by marine engine
manufacturers and emission control suppliers?
Answer:Japan conducted laboratory test of exhaust gas denitration on engines with low-speed,
middle-speed and high-speed rotation fitted with SCR, and obtained result thatcomplies with Tier III standard.

Q4: Provide any additional information and data is pertinent for this review, including
support for your answers to Q1-3, or indicate what additional data is needed and how
can it be obtained.
Answer:In this review, Japan plans to provide data and information which were measured in
the laboratory test of exhaust gas denitration on engines with low-speed, middle-speed
and high-speed rotation fitted with SCR as below.

1. Object and brief overview of laboratory test
2. Participant in the laboratory test3. Brief overview of testing facilities
4. Position of catalyst and NOx measurement apparatus in SCR
5. Initial performance of denitration
6. Duration of the laboratory test
7. Result of operation and denitration performance in the laboratory test
8. Review on SV number
 Term of Reference 2:
Consider the current use of these technologies on marine diesel vessels with a view
towards characterizing the introduction and demonstration of these technologies in realworld applications; Questions for consideration:
Q5: What other marine vessels are using the Tier III NOx technology described above(or other pertinent technology)?
Answer:---- (blank)

Q6: What additional information and data can you provide on the introduction anddemonstration of these technologies in real world applications?
Answer:Japan has conducted on-board trials of exhaust gas denitration on engines with lowspeed, middle-speed and high-speed rotation fitted with SCR in commercial operation
as shown in Attachment 2.
In this review, Japan plans to provide information and data of those trials as below.
1.
2.
3.
4.
5.
6.
7.

Elements and brief overview of test vessels
Layout of engine room and SCR
Position of catalyst and NOx measurement apparatus in SCR
Initial performance of denitration
Route and duration of operation for on-board trial
Result of operation and denitration performance in on-board trial
Review on SV number

 Term of Reference 3:
Consider progress of engine and after-treatment manufacturers towards developing suchtechnology and expectations for bringing Tier III NOx technologies fully to market by2016; Questions for consideration:
Q7: What other additional engine and after-treatment manufactures should beconsidered in this review?
Answer:---- (blank)

Q8: What additional information and data can you provide on the progress of engine
and after-treatment manufacturers towards developing Tier III NOx technologies andexpectations for bring these technologies fully to market by 2016?
Answer:A study of safety measures regarding treatment of reductant including both urea andammonia is being conducted in Japan. The result of this study of safety measures wasreflected on the procedure of on-board trials mentioned above.
Regarding anti-degradation measure of SCR, Japan conducted recovery test of thecatalyst. After heating catalyst with degraded denitration efficiency at 300 degrees
Celsius for several hours, the denitration efficiency was found to be almost recovered
to that of new one.
 Term of Reference 4:
Consider identification of any sub-sets of marine diesel engines where there will not betechnologies available to comply with the Tier III standards;
 Questions for consideration:
Q9: What sub sets of marine diesel engines should be considered, as part of thisreview, where there may not be technologies available to comply with the Tier III
standards by 2016?
Answer:Due to the lack of space, some small vessels may need small-sized Tier III engine inorder to avoid safety hazard which may occur in installing ordinary Tier III engine
such as eliminating a part of its hull structure. The status of technological developmentof small-sized Tier III engine should be followed during this review period, and theproblems occurred in installing Tier III engine into small vessels should be considered
as necessary.

Q10: What additional information and data can you provide on this issue, including
support to your answer to Q9?

Answer:---- (blank)
 Term of Reference 5:Consider where relevant, the global availability of consumable products used by a certain
technology to reduce emissions to the required standard in Tier III, including supply
chain issues, e.g., restrictions on import, export and sale; Questions for consideration:
Q11: Presumably, this point is referring to the use of urea with SCR systems.
there other consumable products that should be considered in this review?

AreAnswer:
Other than urea, ammonia should also be considered as reductant to be used for SCR
especially in large-sized vessels. Besides, availability of catalyst as consumableproducts should also be considered in this review.

Q12: What additional information and data on the global availability of urea (or otherrelevant consumable products) can you provide, including supply chain issues, e.g.,
restrictions on import, export and sale?
Answer:In Japan, the amount of supply of urea for vessels is expected to be sufficientlyreserved. No restriction on import, export and sale exists. Information below isplanned to be provided in the later round.
1.
2.
3.

Infrastructure regarding delivery system of urea and ammonia
Case study of loading of reductant on ship
Price and running cost of reductant

 Term of Reference 6:
Consider the matter including deliberation of what information and data are pertinent for
the review and how that information and data should be collected and analysed." Questions for consideration:
Q13: What additional information would be helpful to carry out the analysis oftechnological developments to implement the Tier III NOx emission standards?
Answer:---- (blank)

Q14: How can this additional information be obtained in a time period and a format
that will be helpful for this Correspondence Group?
Answer:---- (blank)