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LPG or LNG - which fuel is preferable for industrial purposes?

The world we live in today relies heavily on liquid fuel, but due to environmental concerns and cost efficiency, more and more industries are turning to CNG, LPG and LNG fuelsThese fuels are widely used as an excellent alternative to reduce greenhouse gas emissions, minimizcosts and help combat global warming.

LPG and Natural gas are two different gases with a different distribution, energy content, density, combustion and working pressure.

 

LPG is derived from natural gas processing. LPG is better than Natural gas because it has a higher energy content, it is portable and available everywhere, and in many cases, it is now less expensive. Heres an interesting read regarding the properties, uses, disadvantages and comparison of LPG & LNG.

 

A brief on what exactly is LPG:

LPG is a by-product derived while extracting crude petroleum. LPG is colourless, odourlesshighly flammable and weighs twice as much as air. It is comprised of propane mixed with butane, traces of propylene and butylene.

 

Andso, what’s LNG?

LNGa natural gas is converted to liquid form through liquefaction. During this process, natural gas is cooled at low temperatures until it turns into a liquidThe volume of gas is reduced by approximately 600 times during liquefaction.

 

LPG vs LNG

Properties

LPG

(Propane + butane)

LNG

(Methane)

Chemical formula

C3H8+C4H10

CH4

Energy Content

46 MJ/m3

38 MJ/m3

Gross Calorific Value

11850 Kcal/Kg

12953 Kcal/Kg

Appearance

Colorless & Odorless

Colorless & Odorless

Boiling Temp:oC

-27

-161.5

Flame Temp:oC

1967

1950

Flame Temp:oF

3573

3542

Gas Volume: m3/Kg

0.55

1.5

Specific Gravity

1.8

0.55

Density @15oc: Kg/m3

2.2 (Heavier than air)

0.67 (Lighter than air)

 

Want to understand why LPG is preferred over LNG?

  • i) LPG can be stored in vessels and LPG tank ranging from 2kg to 450kg mobile cylinders & stationary bulk vessels of any size. LPG is extremely easy to handle and safe to operate while operating LNG; transported in Cryogenic Vessels is a huge Safety Risk.

  • ii) LPG has an incredibly low pressure for storing at atmospheric conditions (about 5-6 bar), while LNG has a remarkably high pressure for storing at atmospheric conditions (about 250 bar)

  • iii) LPG needs only lesser gas flow to produce the same amount of heat, and lesser time is required to reach a set temperature. LNG needs more amount of heat and temperature too. The LPG gas cost is quite affordable too.

  • iv) LPG has very Low operational & safety risks due to:

- Storage at Atmospheric condition

- Low Storage pressure (4 bar – 6 bar)

- No risks of RPT

Cryogenic storage vessel & transportation of LNG may cause:

- Cryogenic burn 

- Frostbite   

- High risk of RPT (Rapid Phase Transition) leading to Spontaneous BLEVE if temp. increases > (-82oC) and Insulation Failure

  • v) LPG has a High Energy Content of 46 MJ/m3,while the Energy Content of LNG is 38 MJ/m3.

  •  

Advantages of LPG fuel over LNG in the aspect of logistics:

 

LNG use

LPG use

Very high transportation charges (cryogenic):

Fixed & Variable charges (INR 6500/MT for 200 RTKM)

 

Very minimum transportation charges:

Fixed charges usually (INR 2000/MT-Cylinder & 600/MT-Bulk for 200 RTKM)

Travelling time > 24 hrs. can result in BOG losses

No losses during transportation

Multiple stoppages are required to curtail BOG

No stoppage is required

LNG Tankers are limited in number

LPG Vehicles are abundant

Limited LNG terminal infrastructure

LPG has widespread infrastructure

Delays and commitment failure due to transportation issues

LPG logistics is professionally managed

 

SUPERGAS has been the leading Industrial LPG gas company in the country since 1996 and offers comprehensive LPG storage installation services from designing to commissioning. SUPERGAS offers customized solutions based on space availability, application, and technology. Not only that, SUPERGAS does facilitate LPG conversion from liquid fuels because of price, carbon footprint, convenience, and ease of operation.

 

Are you looking to get in touch with our experts for more information? Call us on 9121177930 or send your requirement to sabhishek@supergas.com.