30 November 2020

The FGTF from the ENERGAS is intended to treat associated petroleum gas as a fuel for the gas turbine power plant of East-Messoyakha field. This fuel gas treatment facility provides the specified design parameters of APG for humidity, purity, temperature, pressure and flow rate.

In November, the FGTF, consisting of four compressor units (CU), underwent maintenance according to Regulations-8000. At the time of maintenance, the operating time of each CU amounted to about 18,000 hours. The range of service and technical measures has been carried out by the specialists of LLC ServicENERGAS (part of ENERGAS Group).



In the course of maintenance the following works there were performed:

- Replacement of consumables (gas and oil filters, oil in the bearings of the motors);
- Check the alignment of rotating units (compressors and motors);
- Gaps measure and checking the status of the internal components of the compressors;
- Adjustment and calibration of position sensors and positioning of valves and hydraulic controllers;
- Functional tests of the oil system and cooling system of the compressor units;
- Verification of operational parameters of the FGTF and their adjustment;
- Troubleshooting, drafting recommendations on components replacement.

At East-Messoyakha GTPP, the fuel gas treatment facility was put into operation in April 2017. FGTF of the hangar type is housed in separate building. Compressor units in its composition function alternately – in 3+1 mode (three machines in operation, one in the hot-standby). Operating CUs fully provide the fuel consumption of the power plant, while the fourth machine is ready to be switched on by ATS (automatic transfer switch).



The units are made based on screw oil-filled compressors. The maximum volume capacity of each CU amounts to 9,000 Nm3 / h; gas flow is controlled by a special two-level regulation system.

The efficient compressor module of units gives a high compression ratio:
- Minimum APG pressure at the suction is 0.2 MPa,
- Rated pressure at the delivery line is 2.95...3.05 MPa.

The design parameters for the gas purity are ensured by the multistage filtration system of CU: protective strainer, inlet filter-scrubber of the 1st stage of purification, oil-gas separator of the 2nd stage and coalescing (safety) filter of the 3rd stage. Eventually, compliance of the fuel with the set requirements is achieved: the content of impurities in gas, supplied to the turbines, does not exceed 5 ppmw (mg / kg); the degree of purification from solid particles larger than 20 μm (microns) and liquid fraction is 100%.



At the FGTF, the method of recuperative heat exchange is used – all compressor units are equipped with a gas drying module operating in temperature recovery mode. For this purpose, a chiller and a heater are integrated into the delivery line, which form an interim circuit and successively cool the gas, separate and remove the resulting condensate, and heat the gas. The fuel dried in this way enters GTPP at a temperature of +70°C and not less than 27°C above the dew point.

FGTF is equipped with a gas dew point measurement system for water and hydrocarbons with sampling device. The gas booster machines are additionally equipped with flow viscometers.

Compressor units are fully automated, their control systems are tied by a group regulation algorithm and integrated with the upper level of the power plant's APCS. The joint ACS provides remote control of equipment, and automatic protections and alarm; it monitors the process parameters and gas contamination in the machine room of the FGTF, handles the parameters of the workflows and emergency events, issues information to the operator panel.

Operation mode of fuel gas treatment facility as part of the GTPP is continuous, with scheduled shutdowns for service and maintenance.



REFERENCE:

The gas turbine power plant of the East-Messoyakha field is the northernmost mainland GTPP in Russia. Station has been operating since September 2016, its installed capacity is 84 MW, what provides daily electricity generation in the amount of 1.6 million kWh.

Since April 2017, GTPP-84 has been using associated petroleum gas as a fuel, the volume of APG consumption is about 600 thousand cubic meters per day. Thus, the supply of production and infrastructure facilities with their own energy resources is combined with the rational utilization of APG and improvement of ecological situation at the Messoyakha.

The GTPP structure includes more than 70 various facilities. The main equipment of the power plant is six Titan 130 gas turbine units manufactured by Solar Turbines Inc. with a capacity of 14 MW each.

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