Turboden – waste heat- to-power through ORC technology ...

Turboden – waste heat-to-power through ORC technology: reduce CO2emissions for a more sustainable gas

TRACOM MeetingGyeongyu03-05 September 2018

A Sustainable Future – Powered by Gas

THE TOPIC – WASTE HEAT TO POWER

The conversion of waste heat into useful power represents a viable and

profitable solution for O&G companies to reduce their carbon footprint

while maintaining competitiveness. In this framework, Organic Rankine

Cycle (ORC) technology represents a feasible option to exploit waste

heat and boost the overall efficiency of the gas transportation segment

with minimum impact on the existing facilities.


THE TECHNOLOGY

KEY FEATURES: Possibility to exploit

low/medium temperature heat sources

Wide range of operation, automatic

KEY POINTS:• Easy technology• Flexibility• Reliability• Sustainability


THE CONCEPT

KEY FACTS:• Combined cycle

configuration with multiple gas turbines;

• ORC output from 1 to 20 MW per single turbine;

• Combined cycle output 30÷40% higher than open cycle output.

• By-pass solution, no impact on compressor station operation

• Adaptation to compressor station load


THE REFERENCE CASE

Heat recovery from Solar Centaur 40 gas turbine in a Gas Compressor station in Canada

• Gas Turbine prime power: 3.5 MWm• Gas Turbine efficiency: 28%• ORC electric power: 1 MWe

(approximately 28% of Gas turbine shaft power)

In operation since November 2011 More than 36,500 hours of operation Registered availability: 95%

RESUTS:2,300 tons/year of avoided CO2 emissions (4.3 tonCO2 each Bcf compressed)


THE INNOVATION

The ORC recover heat from the gas turbines and produces electricity, which, instead of being exported is used to fed an electrical motor driven compressor. The national grid is used as back-up source of electricity.This would guarantee a perfect combination between natural gas system electrification and energy efficiency


THE CASE STUDY - CONCEPT

Turboden and SNAM Case Study for an Italian compressor station

Main technical featuresHeat recovery from 2 x PGT 25 gas turbines in operation in a gas compressor station in Italy which will be modernize/empowered:

• ORC power size: 7 MWe

• ORC to serve two 15 MWe electric-driven compressors for natural gas pumping which will substitute two existing old gas compressor station trains


THE CASE STUDY - SOLUTION

1 2 3 4 5

Natural gas pipeline


1 2 3 4 5

CURRENT:Five gas turbines operating alternatively to cover the station compression capacity

FUTURE:Two gas turbines and two electrical motor driven compressor to cover the station compressor capacity


THE CASE STUDY - RESULTS


1 2 3 4 5

TECHNICAL OVERVIEW:7 MWe ORC (working on average at 4.9 MWe over the year) fed by either GT2 or GT3 (both connected to a single waste heat recovery unit) depending on compressor station operation mode.The ORC power output will cover part of the consumption of the electrical motor driven compressor, the rest will be taken from the electrical grid.RESULTS: 10 MSm3/year of fuel gas saving 16% reduction of CO2 and NOx emissions CO2 emission avoided

approximately 20,000 ton/year


CONCLUSIONS

Gas turbines in compressor stations release a sensible amount of heat which could be recovered and transformed in useful power thanks to Organic Rankine Cycle technology.This power can be either dispatched to the electrical grid, reducing the CO2 emissions on a grid level or utilized to modernize/empowering the compressor station with electrical motor driven solution; this second solution will give direct environmental benefits reducing the amount of gas burned.These solutions represent a great examples of synergies between gas and electricity aimed at improving the gas transmission system energy efficiency and consequently making gas even more sustainable for the future.


Waste heat-to-power through ORC technology: reduce CO2 emissions for a more sustainable gas

TOPIC DISCUSSED The implementation of Organic Rankine Cycle technology to

exploit waste heat from gas compressor stations in order to produce useful power,

electricity.

OUTCOMES The electricity produced valorizing the waste heat can be either

delivered to the grid (reference case analyzed) or used to empower the

compressor station structure with a combination of electrical motor driven and

gas turbines driven compressors. In both cases relevant environmental results are

achieved reducing the ton of CO2 emitted for Bm3 of gas transported.

ADVOCANCY SENTENCE Enhanced natural gas transmission efficiency, in synergy

with the electricity sector, marks the path for more sustainable energy networks.


Enhanced energy

efficiency with reduced

CO2 emissions.

ORC is a viable solution for a

more sustainable and highly

performing compression

along natural gas pipeline

The ORC Technology recovering waste heat in gas compressor stations plays a key

role in the decarbonisation path of the Oil & Gas sector.

Turboden – waste heat- to-power through ORC technology ...

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