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ENERGAS Group will upgrade the gas supply scheme of the combined cycle gas turbine unit at Minsk CHPP-2

26 June 2020

Since 2011, a combined cycle gas turbine unit with an electric capacity of 65 MW and a thermal capacity of 52 Gcal / h has been operating as part of Minsk CHPP-2 (RUE Minskenergo). CCGT-65 comprises two power generating units, each of which was created on the basis of SGT-600 gas turbine (Siemens), waste heat boiler Q-235/541-32-3.6/435 (AE&E Nanjing Boiler) and steam turbine СВ-7.5-3.43/0.83/0.12 (Luoyang Generating Equipment). The main fuel is natural gas.



The power generating units are supplied with fuel by a gas treatment system based on a booster compressor station (BCS) of three reciprocating units 2D32-58.5/12-24.5 manufactured by Sichuan Jinxing Compressor Manufacturing.

This system will be upgraded (expanded) – at the gas facilities site, another BCS, supplied by ENERGAS, will be additionally installed. The new BCS based on a screw oil-filled compressor is a block-modular process unit with a maximum integration of the components on a single frame. The station is placed in its own shelter, equipped with all the necessary engineering systems, including life support systems and safety.

The capacity of the unit (16,400 m3 / h) will be 100% of the maximum fuel consumption for two SGT-600 gas turbines, which guarantees complete backup of reciprocating compressors. BCS will provide stable design gas values in terms of delivery pressure (2.481…2.581 MPa) and temperature (up to +50°C).



A feature of the project is the stringent requirements for noise insulation of equipment, due to the location of Minsk CHPP-2 in the central part of the city. The ENERGAS compressor station has unique sound pressure characteristics due to the use of special materials in the enclosure design, the use of low-speed electric motors and fencing of air cooler.

Another of the features is the increased requirements for the purity of gas fuel, taking into account this the filtration system in the BCS is enhanced. The inlet line of unit is equipped with a protective strainer. In addition to the gas-oil filter-separator of the 1st stage of purification and the coalescing filter of the 2nd stage, standard located on the delivery line, the additional (safety) filter for fine purification of gas is built into block-module.

The multistage cascade scheme ensures a residual content of impurities in the gas within 0.5 ppmw (mg / kg) for oil and not more than 5 ppmw for solid particles. To control the quality of the gas, an oil aerosols content analyzer will be installed at the exhaust manifold of the compressor station.

The oil system of BCS uses ester synthetic oil of the new generation ESTSYN, which is specially created for units made based on screw compressors. The oil of ESTSYN CE100 brand ensures efficient operation, increases reliability and equipment life.

For monitoring, control and safety of process procedures of the BCS, a two-level automated control and regulation system (ACRS), which is integrated with APCS of the CHPP-2, is responsible. The first level, the compartment of local ACS, is housed inside the unit and separated from the machine room by a gas-tight fire-resistant partition. The second level, a remote control (operator workstation, WKS), will be localized in the control room of the facility.



The main components of the local ACS have redundancy, the failure of any of them does not lead to the shutdown of the gas treatment equipment. If the voltage is lost, the in-house power supply supports the autonomous operation of the software and hardware complex for at least 6 hours.

The ACRS made based on microprocessor technology, using modern software and connection equipment. Control from the central panel will be carried out in full, similar to the control "in site".

Upgrade of the gas treatment system will increase the reliability of CCGT-65 fuel supply and ensure uninterrupted operation of the combined-cycle power generating units at all modes and under any climatic conditions. All the work on commissioning the BCS and ACRS will be fulfilled by the specialists of ServicENERGAS (part of the ENERGAS Group).

REFERENCE:

Built in 1934, Minsk CHPP-2 is one of the oldest heat and power plants in the Belarusian capital. It is the main source of energy supply to the central part of the city, including the residence of the President of the country, the Government House and the Minsk City Hall. For today, the installed electric capacity of the power plant is 94 MW, and the thermal capacity is 566 Gcal / h.



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