Description of Offer:
At present the annual NG consumption by the industrial complex of Ukraine approximates 35 billion m3. The single-time compression from the pressure p1 = 0.1 MPa to p2 = 3 MPa consumes ~ 1,000 MW (which makes one third of the Zaporozhye Atomic Power Station). The NG pipeline transportation requires booster station installed every 100-150 km, the gas on each of them being pressurized to 3 MPa. The energy costs constitute up to 10 % of the NG cost price. The Mariupol Industrial Region (OSC ILYICH Iron and Steel Works of Mariupol, OSC AZOVSTAL Iron and Steel Works, and other industrial enterprises and public utility companies of Mariupol) consumes 11 mln m3 of NG per day.
However, the enterprises do not utilize high pressure gas. As there are no technical methods of low pressure gas transportation, the electric power for the gas compression is wasted.
There are two pressure reduction methods. The most common is the bottle-neck throttling. The pressure drop due to the friction, but the enthalpy is recovered to its initial state. The process is isoenthalpic. When throttled, the gas temperature is usually decreased. Thermodynamically, throttling is an ultimately irreversible process, during which the pressure is reduced without any useful work done. The main advantage of the throttling method is the easy pressure and consumption regulation control.
The other pressure reduction method is the polytropic expansion in the gas turbine. This method finds its application in cryoengineering and utilization of the excess blast furnace gas in power production. Ideally (frictionless expansion) all the electric power previously used for the gas compression can be recovered. However, in fact due to the friction and other irreversible losses (off-design outflow mode, stream shock losses, additional friction caused by the in-expansion gas humidification etc.) only 40-50% of initial energy for pressurizing can be recovered.
As in other industrial regions of Ukraine, the latter pressure reduction method is not used in the Mariupol region. Even at the new lines the inefficient consumption and pressure control method of gas throttling is employed. The gas distribution stations GDS-1 (Vostochnyi district) and GDS-2 (Mirnyi village) installed at the entrances of the Mariupol industrial region deal with gas throttling for the ironworks from 2.7-3 MPa to 0.6-0.8 MPa, and for the city community facilities - to 0.15 MPa. This way the larger amount of the given compression energy is irreversibly lost during the throttling.
The technical proposal involves designing a highly efficient energy-saving technology that is ensured through the replacement of existing throttling devices on the gas pipelines (supplying gas on the northern line from Volnovakha or Taganrog directions) with the expansion turbines. The implementation of the proposal does not require high capital investments or great operation costs. On the contrary, the electric power recovery, for instance in the Mariupol industrial region, will reach 12¬15 MW. On the national scale 400-500 MW of power spent on the gas compression can be recovered.
The technical proposal is aimed at the 40-50% (depending upon the season - winter/summer) recovery of the electric power spent on the NG compression without any substantial capital investments and employment of additional resources. The expansion turbines can be produced at the Poltava Turboengine Factory, Mykolaiv Shipbuilding Yard or Kharkiv Turbine Factory, which are nowadays not overloaded with orders (200-250 turbines are needed for industrial regions of Ukraine)

Innovations and advantages of the offer:
In the electric power industry the installation of the so called top expansion turbines instead of throttling devices has become a rule (Picture 2). The top steam turbines with the capacity up to 50 MW have been developed. For instance, the P-12 type steam anti-pressure turbines with the electric capacity of 12 MW have been installed at OSC ILYICH Iron and Steel Works of Mariupol and OSC AZOVSTAL Iron and Steel Works. In case if the throttling devices were used, the irreversible power losses on the two of Mariupol enterprises would have amount to 24 MW

Cooperation demand description:

Expected countries (regions) for cooperation:

If you can meet this technoloyg need please contact us quoting: REF:UKR20/Utilization of the pressurized gas potential energy in electric power production

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