scr system - scania · scr control unit 3 m 4.5 m, 6 m ... scr system - 5 reductant doser...

SCANIA industrial engines

sCr systemeu stage iV, us tier 4f

SCR (Selective Catalytic Reduction) technology is used on Scania’s engines for EU Stage IV and US Tier 4f to reduce the NOX content in the exhaust gases. A chemical process is started by injecting reductant, a urea and water mixture, into the exhaust gas stream. During injection the water evaporates and the urea breaks down to form ammonia. The ammonia then reacts with the nitrogen gases in the catalytic converter and forms harmless products such as nitrogen gas and water. Through the use of SCR the exhaust gases are purged of poisonous levels of NOX in the best possible way. Scania is making use of a system that is carefully developed and tested in our own laboratory.

The reductant tank is available in different sizes and is heated by the engine’s cooling system in order to avoid freezing of the urea solution; urea freezes at -11°C. The tank and a pump module are delivered as a unit which is fitted to brackets for an easy installation. The Scania system contains all mechanical and electrical parts needed except from the exhaust piping which is to be adapted according to the customers installation.

Mechanical system Standard Optional

1 Evaporator module -

2 Reductant pressure line 2.5 m 3.5 m, 4.5 m, 6 m

3Coolant hose for tank and pump heating

- -

4 Coolant valve -

5 Reductant fluid return line 2 m 3.5 m, 4.5 m, 6 m

6 Reductant tank 38 l 45 l, 60 l, 69 l, 70 l

7Coolant hose, return from tank and pump heating

- -

8 NOx sensor with control unit -

9 Oxidation catalytic converter1) Engine-mounted Separately

10 Temperature sensor -

11 SCR catalyst -

12 NOx sensor with control unit -

Electric system Standard Optional

1 Customer interface, SCR system –

2 Pipe network between engine and SCR control unit

3 m 4.5 m, 6 m

3 NOx sensor electrical cable 3 m 4.5 m, 6 m

4 Electrical interface, SCR system -

5 Reductant doser electrical cable 3 m 4.5 m, 6 m

6 Temperature sensor electrical cable 3 m 4.5 m, 6 m, 9 m

7 NOx sensor electrical cable 3 m 4.5 m, 6 m, 9 m

The principle for Scania SCR system

This specification may be revised without notice.

1) Not DC13 085A or DC16.

6 (ref. 80)

10

5 (ref. 81)

8

4

12

3

7

2 (ref. 81)

11(ref. 82)

1Flange

(ref. 83B)

Flange (ref. 83A)

Flange (ref. 83D)

Flange(ref. 83C)

Bellow(ref. 83G,ex. pos.)

Flange(ref. 83F)

Flange (ref. 83E)

9(ref. 82B)

1:72

69

4 6 (ref. 88)

5 (ref. 86) 2(ref. 85)

3(ref. 87A)

7(ref. 87/87B)

1

1:72

70

Mechanical system Electric system

SCANIA industrial engines

se 151 87 södertälje, swedentelephone +46 8 553 810 00telefax +46 8 553 829 [email protected]

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Evaporator module (DC9 and DC13)

Oxidation catalytic converter (not DC13 085A or DC16)

720 280

7557

521 1:

7265

Reductant tank - 38 litresTotal volume: 50 litresFilling volume: 38 litres



279.9

700.4

7512

.9

1:72

66

This specification may be revised without notice.

Engine Dimensions A (mm)

DC09 84 / 85 / 87 / 89 786

DC09 86 900

DC13 84 / 87 / 89 900

DC13 85 970

DC16 970

Evaporator module (DC16)

1:73

25

575

585592

470

720 280

7557

521 1:

7265

279.9

700.4

7512

.9

1:72

66

1:73

25

575

585592

470

SCR catalyst

Other available sizes: 45 litres (total volume 62 litres) 69 litres (total volume 80 litres)

scr system - scania · scr control unit 3 m 4.5 m, 6 m ... scr system - 5 reductant doser...

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