(LDO ) or (heavy Diesel) ? 3

[shankerm]

hello,

I operate a 660kg/hr steam boiler(LDO fired)and also a hot oil generator(2lakh cal/hr) using the regular DIESEL from the gas station.

We plan to start using LDO, and for this. I'am trying to find out the calorific values of both the normal diesel and LDO. LDO happens to be cheaper, but is it feasible?

Any suggesions? Should we switch over to LDO or continue using the regular DIESEL???

Thankyou !

 

[TD2K]

By the time you get into the higher MW hydrocarbons, most have similar heating values in terms of BTU/lb. I would look at the price difference and density difference (if any between the two grades of diesel] and see what the difference is.

Basically, for these two fuels you are going to fire a constant BTU load or that is how I would look at it.

 

[25362]

Published typical gross calorific values of commercial grades of UK domestic oil fuels:

Kero Class C1: 46.7 MJ/kg
Class C2 kero: 46.5 MJ/kg
Class D gas oil: 45.4 MJ/kg

Perry VI gives, in FIG. 9-4, the net and gross calorific values of liquid fuels as a function of their API gravity or specific gravity at 60/60F.

On a weight basis, the heating value of petroleum fuels decreases with increasing specific gravity (decreasing API gravity) since the weight ratio of carbon (low-heating value) to hydrogen (high-heating value) increases with the specific gravity at 60/60F.

On a volume basis, the increasing sp. gravity more than compensates for the decreasing heating value per unit mass, with the net results that fuels having high sp. gravity yield more heat energy per unit volume than those of low sp. gravity (!)

 

[quark]

You are not supposed to use HSD,in an industry, (high speed diesel, that is the regular diesel from gas stations)except DG sets with out permission from authorities as far as I know. The reason is that the price of HSD is highly subsidized at the moment. But the time is not far off when we get a barrel of diesel for a barrel full of money, thanks to the new government.

Coming to the technical issues, NCVs of HSD and LDO are 10500 and 10100kCal/kg respectively. Additional quantity of steam you can produce using HSD is nor morethan 1kg per kg of HSD. The prices at the moment are Rs.16/kg of LDO and Rs.26/kg of HSD. Technically there are no issues except problem with pollution control.

The norms of PCB are <110ppm of SPM, <80ppm of NO<sub>x and <80ppm of SO2 in the flue and your boiler manufacturer will not guarantee this if your burner is initially designed for HSD.

Frequency of cleaning combustion chamber and flue gas path will increase.

Regards,</sub>

 

[shankerm]

Thankyou so much ! My problem is solved

 

[sfcnsb]

I'm planning on running a 32MMBTU/hr steam generator and fire it with diesel. I'm looking for some help on determining the emissions (ie. Nox). We can assume 85% combustion effeciency and 3% excess O2. Can anyone help me on this question.

Best Regards