Reformer And After Treatment Devices; Reforming Mechanism - Kubota B2650HSDC Workshop Manual

B2650HSDC, B3350HSDC, WSM

2. REFORMER AND AFTER TREATMENT DEVICES

[1] REFORMING MECHANISM

(1) Reformer
(2) Burner Glow
(3) Turbocharger
(4) Doser Fuel Pump
(5) Air Blower
The reformer (1) is a Diesel Particulate Filter (DPF) regeneration device that is not dependent on the combustion
method.
Fuel "B" and air (primary air "E") are supplied to the reformer (1) which has reforming catalyst. Fuel "B" and
primary air "E" reacts and generate reformed gas through reforming catalyst and heat from the heater glow (7). The
reformed gas "C" generated in this manner is mixed with exhaust gas "D" and reaches the Diesel Oxidation Catalyst
(DOC).
If the exhaust temperature (DOC In) is higher than 250 °C (482 °F), the reformed gas "C" makes exothermic
reaction with the DOC, raises the exhaust temperature (DPF In) above 550 °C (1022 °F) so that the Particulate Matter
(PM) can be removed through combustion.
If the exhaust temperature (DOC In) is lower than 250 °C (482 °F), reformed gas is ignited by using burner glow
(2) ("Low Temperature Ignition") so that the exhaust temperature (DOC In) is above 250 °C (482 °F). In this situation
the secondary air "F" is supplied to the reformed gas "C" in order to increase the amount of oxygen to assist ignition.
(6) Air Valve
(7) Heater Glow
(8) Diesel Oxidation Catalyst
(DOC)
(9) Diesel Particulate Filter (DPF)
A: Air
B: Fuel
C: Reformed Gas
1-M5
ENGINE
D: Exhaust Gas
E: Primary Air
F: Secondary Air
9Y1210822ENM0021US0
KiSC issued 05, 2014 A