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Upgrade of the gas treatment system for the CCGT-230 combined-cycle power unit at Minsk CHPP-3 is going according to plan

11 March 2021



Since 2009, a combined cycle gas turbine unit (CCGT-230) has been operating as part of Minsk CHPP-3 (branch of RUE Minskenergo). The power generating unit is supplied with fuel by a gas treatment system based on a booster compressor station (BCS) manufactured by VPT Kompressoren GmbH.

Gas treatment system is being upgraded by an additional BCS from ENERGAS. This BCS is made on the basis of a screw oil-filled compressor and is a block-modular process unit with a maximum integration of the components on a single frame. The station is placed in its own sound-absorbing shelter which equipped with all the necessary engineering systems, including life support and safety systems.



Unit with a capacity of 38,160 kg / h will compress fuel to the required designed values (2.7 MPa) and feed it to the gas turbine of CCGT. Gas flow rate depends on the dynamics of changes in the turbine load and is controlled in the range from 0 to 100% of nominal. For this purpose, a special two-loop capacity regulation system is applied.

Fuel gas filtration system is composed of gas-oil separator of the 1st stage of purification and the coalescing (safety) filter of the 2nd stage. Residual content of impurities in gas at the outlet of the BCS is not more than 1 ppmw (mg / kg). The process flow scheme and configuration of elements of the compressor station provide for stable maintenance of the project temperature of fuel (+50°C).

The supply set of the new equipment also includes an air compressor station. The modular auxiliary ACS, housed in a separate block-box, will provide compressed, dry and pure air for the pneumatic components of the booster compressor station.



Gas supply scheme for the combined-cycle power unit will be also changed. Current and new BCS for fuel gas will operate alternately, evenly distributing the operational load. When one station is turned on, the second one switches to the hot-standby mode.

ENERGAS has equipped the compressor equipment with a two-tier automated control and regulation system (ACRS), which combines local ACS of both BCS and integrates them into the automated processes control system of a facility. Remote control (operator workstation) is located in the control room of the CCGT.

Currently, adjustment works are underway at the additional booster compressor station, air compressor station and automated control and regulation system. Pre-start activities will end with individual testing and integrated tests as part of CCGT-230.



The equipment is being commissioned by the specialists of the ServicENERGAS (ENERGAS Group). Upgrade of the gas treatment system will increase the reliability of the fuel supply of the combined-cycle power generating unit and ensure its uninterrupted operation of the at all modes and under any climatic conditions.

REFERENCE:

In the power grid of the Republic of Belarus, Minsk CHPP-3 has been operating since 1951, its installed capacity today is 542 MW. MCHPP-3 is part of a single production and process complex for the generation, transmission and distribution of thermal and electric energy.

Highly efficient CCGT-230 with an electric capacity of 222 MW and a thermal capacity of 136 Gcal/h was created on the basis of the GT13E2 gas turbine (Alstom), the HRSG/DP01.1 waste heat boiler (SES ENERGY) and the T-53/67-8.0 (UTW) steam turbine. The power generating unit efficiency is 52.5%. The main and reserve fuel is natural gas.



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