Rovinari Power Plant – Wet flue gas desulphurization plant with common installations for reagent and end product

Written by dragos on . Posted in Ongoing_Projects

Rovinari Power Plant – a major thermal power plant in Romania was commissioned between 1976-1979. Rovinari Power Plant is considered a base load plant with a nominal installed capacity of 1320 MWEe. Due to the power plant strategic location in the middle of the lignite fields Rovinari, Tismana and Pinoasa and due to the fact that RPP owns these fields, the electricity production costs are low compared to other thermal power plants in Romania.

Increased competition, access to new energy markets, as well as complying with the regulations for environmental protection, are important issues for RPP to consider for its future operations.Thus, the main objective for the project of Rovinari Power Plan is to reduce SOx emissions to reach the national and EU directive on environmental requirements for large combustion plants, valid from 1st of January 2008.

The project consists of implementing some Wet FGD installation to the steam boilers rated 1035 t/h and 330 MWEE to units 3,4 and 6, in order to reduce SO2 content in flue gases resulted from burning fossil fuels.

The installation for retaining SO2 from flue gases consists of:

  • the absorption installation of SO2
  • the preparation installation of limestone slurry

The end product of the desulphurisation process is gypsum slurry but at the moment not necessarily applicable for civil constructions purpose.

Services offered:

The Project develops the following phases:

  • technicalproject and duty books
  • detail engineering
  • technical assistance during execution works and commissioning

Estimated technical performances:

The FGD plant shall meet the emissions requirements according to EU legislation regarding environmental pollution: SOx – 400 mg/Nm3 dry gas 6% O2; solid particles – 50 mg/Nm3 dry gas 6% O2

Estimated economical efficiency:

  • complying with the environmental EU legislation regarding SO2 emissions
  • after execution of the works the power plant shall be capable to operate on lignite, heavy fuel oil and gas in the boilers with a significant SOx emissions

Country and location:

Romania; Rovinari city at about 16 km of Targu Jiu city, Gorj county

Client / Investor:

SC Complexul Energetic Oltenia Sucursala Electrocentrale Rovinari

Start / Completion date (commissioning):

Start: November 2007
Finish: October 2013

110 kV and 220 kV bays overhaul and upgrading – 220/110/20/6 kV FAI substation

Written by dragos on . Posted in Ongoing_Projects

The 220/110 kV FAI substation is an important power node, having in view its multiple functions, such as the power injection ensurance from the zonal power transmission grid to the power distribution grid of Iasi city, ensuring the power distribution to the consumers of power, discharged from the transmission system and from local power supplies and representing, along with the 220/110 kV Munteni substation, the only power supplies for the geographical area between Iasi, Birlad and Pascani.

The 110 kV and 220 kV substations rehabilitation operation consists of capital repair works and upgrading works, aiming to bring this connection and transformer substation to an appropriate technical level, in terms of the substation power importance.

The works, pertaining to the substation upgrading, are related to the new 110 kV and 220 kV bays or to those with a new location, due to the upgrading operation.

The rehabilitation works will be performed by stages, using the “step by step” method, maintaining the actual constructive arrangement, simultaneously with the upgrading works for the control – supervisory-protection system.

Assuming the importance of 220/110 kV FAI substation for NPS, the end-user requested the ensurance of a raised degree of reliability in supplying the power consumers of the zone, throughout the performance of the rehabilitation works.

The Project provided, in this respect, the following:

  • provisional works in the primary and secondary circuits of the 110 kV substation
  • provisional works on 110 kV OHLS
  • by the Project-adopted works staging program, the reducing to minimum of the number and duration of decommissioning operations for the existing circuits and the feature of making redundant some power supply ways.

The Project is meant to achieve a new, outdoor-type substation, provided with modern, reliable and performing equipment, including all arrangements and auxiliary installations.

The new 220/110 kV substation will be outdoor-type, air-insulated and it will be performed, at both voltages, with a double bus-bar system, under a flexible variant.

In the 110 kV substation, the circuit-breakers will be arranged on 2 rows, each side of the bus-bar spans and in the 220 kV substation, the circuit-breakers will be arranged on one row. The overhead, flexible connections will be made of aluminum-steel, flexible conductors, supported to frames by double insulator strings, of composite material.

The primary equipment location was established in such a way that it shall allow the access to equipment, requiring more frequent maintenance works, in compliance with the electrical insulation and protection clearances, according to the norm requirements and without de-energizing some parts of the substation. In this respect, the existing roads, under-crossing the 110 kV bus-bar system 1, will be dismantled and it will be built up two new road segments, within the CR works, between the circuit-breakers row and that of the current transformers, placed each side of the bus-bar spans.

There were also built new road segments for accessing the voltage transformers and surge arresters, installed on the 110 kV and 220 kV lines, as well as on the storage platform.

The connection of the existing 200 MVA-220/110 kV auto-transformers of the substation to the pertaining 110 kV bays, was performed via:

  • one cable-inlet connection, with single-phase, 110 kV, XLPE-insulated cable and provided with outdoor, dry-type sealing ends, for AT1
  • one overhead connection, made of flexible conductors supported by centrifuged reinforced concrete frames, for AT2.

Supplied services:

  • basic design and tender documents for civil and mounting works performance, for 220 kV and 110 kV primary circuits, 1 kV cable network, civil works, outdoor electrical lighting and sewage installations, land arrangements and roads
  • detail design
  • technical assistance.

Estimated technical performances:

  • bringing the 220/110 kV FAI substation to a technical level appropriate to the zone and the project energy importance, using the worlds state-of-the art technique
  • ensurance of a increased degree of safety and reliability in supplying the zonal power consumers throughout the period of upgrading works performance and the equipment lifetime as well.

Estimated economic efficiency:

  • ensurance of power transfer and supply for the power system, with the specified and regulated indicators and parameters and under safety and continuity conditions
  • reducing of maintenance costs.

Country and location:

Romania, Iasi city, Iasi district

Client:

Energomontaj SA – IEA Bucharest Subsidiary

Start / Completion date (commissioning):

09.08.2007 – under progress