Modern gas treatment system of "ENERGAS" provides fuel for the new power center "Yarega" (LUKOIL-Komi)

18 December 2017

PJSC "LUKOIL" put into operation the next facility of its own generation in the Republic of Komi - the power center "Yarega", built on the basis of GTU-CHPP. LUKOIL-Energoengineering LLC (a 100% subsidiary of LUKOIL) developed the project and implemented it using the main domestic equipment and innovative technologies at all stages of construction.

The new facility includes three gas turbine power units GTPP-25PA produced by JSC "UEC-Aviadvigatel" with a total installed capacity of 75 MW. For issuance of the thermal power at the GTU-CHPP there are mounted three waste-heat boilers with total steam capacity of 121 t / h.

The start-up of the power center allows to meet the growing need for electricity and steam of strategic Yarega oil-and-titanium field, to increase the efficiency of its development and reliability of energy supply.

The fuel for turbines of the GTU-CHPP is natural gas from Kurino-Patrakovskoye gas condensate field.

The required gas parameters (at the inlet into turbines) in terms of purity, temperature, pressure and flow are provided by the multifunctional gas treatment system of "ENERGAS", which is composed of block-type gas treatment unit, ACS of gas feeding as well as booster compressor station (BCS) consisting of 4 units.

Block-type gas treatment unit (BGTU) manufactured by the LLC "BelgorodENERGAS" is a processing unit with maximum integration of the components on a single frame. Its main purpose is measurement of gas flow rate and gas filtration. BGTU is equipped with bilinear gas metering station (with ultrasonic flow meters) and filtration module.

The degree of gas purification is 100% for liquid fraction and 99.8% for solids of size larger than 10 microns. The content of mechanical impurities at the outlet is not more 0.001 g / m3.

Additional functionality – gas pressure stabilization. For this purpose BGTU is equipped with pressure reduction system. Contents of equipment also includes underground draining tank for gas condensate gathering; tank is equipped with a level sensor and a pump for condensate discharge. Capacity of BGTU is 15,780 kg / h (21,540 m3 / h).

Gas treatment unit is located at an open site (inside easy-to-assemble enclosure); it is equipped with all necessary engineering systems. Operation mode is automatic. After pretreatment, the gas flow is fed to the booster compressor station.

BCS compress gas up to operating pressure in the range of 4.5…5 MPa and feed it to the turbines of GTU-CHPP. It consists of four compressor units (CU) of screw type. Capacity of each CU is 7,890 kg / h (10,770 m3 / h). Gas flow rate is adjusted by means of the two-tier capacity regulation system.

Units are placed in separate block-modules of arctic type equipped with life support systems (heating, ventilation and lighting) and safety systems (fire detection and fire fighting, gas detection, alarm).

Modern gas treatment system was developed on special project. Coefficient of operational reliability is 0.98. Inside CU and BGTU there is provided open space for easy and comfortable access to all assemblies and components what allows possibility for year-round quality performing of service activities (maintenance, spare parts and consumables replacement, overhaul, upgrade).

For efficient monitoring, management and safe operation of this process equipment there is responds completed two-level automated control system - ACS of gas feeding (ACS GF).

The main elements of the ACS GF are the following: local control systems of BCS and BGTU, control cabinet, the operator workstation, remote emergency shutdown. Internal and external connections are made using an Ethernet network as well as "S7-connection" and "Profibus" protocols.

The phased commissioning of the multifunctional gas treatment and gas feeding system, including mounting, start-up, individual testing, operability verification as a part of power center, has been performed by the engineers of LLC "ServicENERGAS" (companies group ENERGAS).

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