DAIHATSU DIESELAUS
GENERATOR(AQUEOUS UREA SOLUTION)

for the SCR NOx reduction system

Urea Solution Device

With DAIHATSU’S AQUEOUS UREA SOLUTION GEN
high grade aqueous urea solution indispensable acan be produced on-board easily from urea powd

The IMO NOx Tier-III standards, applied to diesel engines installed on ships built in January 2016 or later
reduction in NOx emissions in NOx Emission Control Areas (NOx-ECA) compared to NOx Tier-I.
One of the principle means of complying with these stringent standards is the Selective Catalytic Reducti
which requires an Aqueous Urea Solution (AUS) NOx reducing agent of a consistent high quality. Current
equipped with large on-board storage tanks containing enough AUS for the entire navigation of NOx-ECA
Instead DAIHATSU DIESEL offers the AQUEOUS UREA SOLUTION GENERATOR, allowing you to produce oneed, when and where you need it, and as always with DAIHATSU’s thorough after-sales service included

Advantages of the AUS Generator

1 Dispense with large, space-consuming AUS storage tanks● Large on-board tanks storing the entire voyage’s quota of AUS are no longer needed. Although a buffer tankwill be required to provide AUS this tank is far smaller than the aforementioned storage tanks.

2 Save money on your AUS● In general, AUS produced from urea powder is cheaper than buying AUS already in its liquid form.

3 Loading urea powder is easier than loading AUS● In order to load AUS, an Intermediate Bulk Container (IBC) and pump are required to transfer

the AUS from the container to the tank. With powder these are not needed.

4 The same high quality AUS every time
● Storing AUS for extended periods risks exposing it to temperature fluctuations that decrease

its quality and shelf-life. Producing AUS from powdered urea when it is needed maintains
the AUS quality and helps to prevent the SCR’s catalyst from becoming stained or obstructed.

AUS GENERATOR
Heating Unit

Concentration Sensor

DAIHATSSCR SYS

AUS agitation pump

AUS GENERATORERATOR,NERATOR,s an SCR’s NOx reducing agent, for the SCR NOx reduction systemer and distillate water.

r, require an 80%

on (SCR) system,
ly ships must beAs.
only the AUS youd as standard.

SU DIESELTEM

Structure and Function
The AQUEOUS UREA SOLUTION GENERATOR consists of a tank, pump, heating unit andfilters arranged on a common base plate to form a unit. Through the process outlined
below the valves, pump and heating unit are operated automatically to reach a fixed AUS
concentration. The process is designed to take 3 - 3.5 hours.
The process time varies depending on the selected model and the supplied distillate water temperature.

a Add the prescribed mass of urea powder into generator.
b Close the lid and start the generator. The addition of distillate water and agitation
automatically begins.
c A sensor monitors the consistency, continuing the process until the prescribed AUS
concentration has been reached.
d After notifying the completion of the agitation procedure, the generator stops.
e Once the available volume of the buffer tank and transfer lines has been confirmed,
manual transfer of the AUS can begin.
f The production cycle ends when all of the AUS has been transferred.

：AUS agitation Line
Urea powder inlet：Produced AUS transfer line：Distillate water line

MHeating UnitMFilterFTDTDistillatewater inlet

M

AUS outlet
FilterM

P ： AUS agitation pumpP

DT ： Concentration sensor
FT ： Flow sensor
M ： Motor Valve
The material of pipe, valve, and fittings shall be made of stainless steel from urea solution outlet to shipyard storage tank.

Specifications
Model

DNS-300

DNS-500

DNS-1000

Mass of urea powder

kg

300

500

1,000

AUS concentration% wt

404040Required distillate water

Lit

450

750

1,500

Amount of AUS produced

Lit

675

1,120

2,250

Pump motor for agitation−2.0kW

2.0kW

5.5kW

Heating Unit

−Pump/heating unit power supply
External
measurements
Mass

Electriclength

−mm

2,000

2,400

widthmm

1,700

2,000

AC440V 60Hz 3 phase
2,800
2,550

heightmm

1,400

dry mass

kg

780

1,060

2,070

op. mass

kg

1,530

2,310

4,570

*1

1,400

*1

1,600 *1

*1: Height to top of tankSpecifications in this catalog are subject to change without notice.

AUS production interval (days)

AUS Generator Model Selection
1086

DNS-1000

4DNS-500

20

DNS-300
0500

1,500

1,000

2,000

5,000

10,000 15,000 20,000

Av. output of M/E & D/G in NOx-ECA

AUS production interval (days)

From the above graph we can determine the most suitable AUS generator model. The redplot above signifies a diesel generator (D/G) averaging an output of 700kW in a NOx-ECA
with, for example, a 4-day AUS production interval planned. From this plot we would selectthe DNS-500 generator as the most appropriate model. If, for the same output, a 2-day AUS
production interval were preferred the resulting plot would be the one in green and theDNS-300 generator would be selected.
Produced AUS may also be used for the main propulsion
1.2engine’s SCR system.The blue plot on the graph to theright indicates the combined average output of 12,000 kW
0.9
from a diesel generator and a main propulsion engine(M/E). The graph shows that operating the DNS-1000
0.6
twice a day would be enough to provide the necessaryamount of AUS.

Enlarged

DNS-1000

0.3

0.0
5,000

10,00015,00020,000Av. output of M/E & D/G in NOx-ECA（kW）

Case Study: Car Carrier’s AUS storage tank (for reference)(Main engine rated output: 14,000kW ; Time in NOx-ECA: 7 days)
AUS GeneratorWithout DNSWith DNS

Storage Tank Capacity

17.0m

AUS Generator Model−DNS-1000

AUS Production interval−

At sailing: twice a day
At port: once every 4 days

35.0m3

Stainless steel
independent tankHead Office

1-30, Oyodo Naka1-chome, Kita-ku, Osaka, 531-0076 Japan
TEL: +81-6-6454-2393 FAX: +81-6-6454-2686

Tokyo Office2-10, Nihonbashi-Honcho 2-chome, Chuo-ku, Tokyo, 103-0023 Japan
TEL: +81-3-3279-0827 FAX: +81-3-3245-0395

Moriyama Division

45 Amura-cho, Moriyama-city, Shiga, 524-0035 Japan
TEL: +81-77-583-2551 FAX: +81-77-582-5714

Daihatsu Diesel Himeji Mfg. Co.,Ltd. 12-8, Fuji-cho, Hirohata-ku, Himeji-city, Hyogo, 671-1123 Japan
Daihatsu Diesel (EUROPE) Ltd.

TOG Borough Yards, 13 Dirty Lane, London, SE19PA, UK
TEL: +44-20-4566-5600

Daihatsu Diesel (AMERICA), Inc.

380 N Broadway, Suite 302, Jericho, N.Y. 11753 U.S.A.
TEL: +1-516-822-3483/4 FAX: +1-516-822-3485

Daihatsu Diesel (ASIA PACIFIC) Pte.Ltd. 16 Collyer Quay, Income at Raffles #29-02, Singapore 049318
TEL: +65-6589-9510 FAX: +65-6536-4964

Daihatsu Diesel (SHANGHAI) Co.,Ltd.

●●Room A-B, Floor 14, Huamin Empire Plaza, No.728, Yanan Rd.(W.), Shanghai, 200050, China
TEL: +86-21-6225-7876/7 FAX: +86-21-6225-9299

Please refer to our separate brochure for the "DAIHATSU AFTER-SERVICE NETWORK".
All information contained in this pamphlet is correct at the time of printing, but may be subject to change without notice.

www.dhtd.co.jp

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