Exhaust System - Belarus 3522.5 Operator's Manual

3.1.5 Exhaust system

1 – tank with AdBlue agent (urea); 2 – bracket to fix a catalyst; 3 – catalyst; 4 – catalyst
guard; 5 – exhaust pipe; 6 – mixing pipe; 7 – inlet pipe; 8 – NOx sensor (оnitrogen oxides); 9, 10 –
cooling pipelines of dosing module; 11 – pipeline of urea delivery from feeding module to dosing
module; 12 – dosing module (urea injector); 13 – sensor of exhaust gas temperature before catalyst;
14, 17 – pipelines for warming up urea in the tank; 15 – pipeline to take urea away from the feeding
module to the tank; 16 – pipeline to deliver urea from the tank to the feeding module; 18 – pipeline to
deliver coolant from the engine cooling system to SCR system; 19 – feeding module (pump); 20 –
urea warming up valve.
"BELARUS-3522.5" exhaust system consists of an inlet pipe 7 (figure 3.1.5), a system of selective
catalytic reduction and an exhaust pipe 5.
The system of selective catalytic reduction (SCR) is intended to ensure a required chemical
composition of exhaust gas under Stage Tier-IIIB in the exhaust system.
The SCR consists of a catalyst 3, a mixing pipe 6, a dosing module (injector) 12, a feeding module
(pump) 19, a tank for AdBlue agent 1, a bracket to fix the catalyst 2, cooling pipelines of dosing module 9
and 10, pipelines for warming up urea in the tank 14 and 17 (14 – a pipeline to take coolant away to the
engine cooling system; 17 – pipeline to deliver coolant from cab heating system); AdBlue intake pipelines
16, pipelines to deliver AdBlue agent 11, AdBlue takeaway pipelines 15, valves to control warming up of
AdBlue tank 20, guards 4 of a catalyst 3.
Figure 3.1.5 – Exhaust system
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