Page 184 - Advanced Mine Ventilation

164 Advanced Mine Ventilation

Table 11.8 Properties of Fuel Additives for Reducing DPM Emissions

Suggested Weight DPM
Blend Ratio Percent Flash Reduction
Additive (Additive/Fuel) Oxygen Point (8F) (Percent)
Diethylene glycol 10/90 40.0 189 25.3
Methyl ether
Liquid DME 11/89 36.5 71 a 32.8
96% 1,2
dimethoxylethane
4% dimethoxyethane
Triethylene glycol 11/89 36.0 185 12.1
Dimethyl ether
(triplyme)
Diethylene glycol 11/89 35.8 156 19.3
Dimethyl ether
(diglyme)
1,2-dimethoxy ethane 11/89 35.6 78 a 17.5
(glyme)
Methyl soyate 35/65 11.0 207 30.9

a
These fuel additives have a flash point temperature lower than ASTM specification of 125 F.

11.3.3 Catalytic Converter
A well-designed catalytic converter placed in the exhaust system next to the engine can
drastically reduce all gaseous emissions, including carbon monoxide, unburnt hydro-
carbons, and soluble organic fractions (containing polynuclear aromatics). It is a
compact, durable, reliable, and a low-cost component. It should, therefore, be an inte-
gral part of all diesel engines approved for underground coal mines. Table 11.9 shows
the characteristics of a well-designed catalytic converter.

Table 11.9 Characteristics of a Well-Designed Catalytic Converter
CO Reduced by 80%e95%
HC Reduced by 85%e90%
DPM Reduced by 25%e35%
Odor control Very good
Influence on engine Low-pressure drop; no fuel penalty
Reliability Very good
Durability 5000 h