10 June 2021

In the Republic of Kazakhstan, an investment project to enlarging Aktobe CHPP is being implemented. A cogeneration power unit is being created here on the basis of a gas turbine with a waste-heat boiler, which will be integrated into the existing process flow scheme of the facility. The launch of the gas turbine unit (GTU) is scheduled for 2022.

The upgrade project will significantly improve the technical, economic and environmental characteristics of the power plant:

- Electric capacity will be increased by 1.5 times (up to 175 MW);
- Efficiency factor will be raised;
- Specific reference fuel consumption for energy production will be decreased;
- Emissions of nitrogen oxides and carbon monoxide into the atmosphere will be reduced.

Changes in the structure of the heat load (growth in the consumption of technological steam) will lead to the cancellation of the existing restrictions in the operation of the CHPP and will allow it to be used year-round in the basic mode. Decommissioning the part of the obsolete boiler equipment will increase the power plant's profitability. In the future, a gradual replacement of medium pressure boilers is planned.

Overall, the commissioning of the gas turbine unit will minimize the negative impact on the environment, increase the volume and reliability of energy production, optimize electricity and heat supply to the city of Aktobe, and reduce the electricity shortage in the power system of Aktyubinsk Region.

The GTU is based on a Siemens SGT-800 gas turbine with a capacity of 50 MW, which provides main generation. The SGT-800 industrial turbine combines robust design, high efficiency and low emissions, as well as has high exhaust energy, that allows it to be effectively applied in the combined cycles.

From turbine, exhausted hot gases (fuel combustion products) enter waste-heat boiler manufactured by JSC Machine-Building Factory of Podolsk. The WHB will generate steam with a pressure of 3.0 MPa and a temperature of 420°C in an amount of 70 tons per hour.

The superheated vapour of medium pressure, resulted in the WHB, is sent to the existing steam turbines of Aktobe CHPP for secondary electricity generation (combined cycle).

Thus, the scheme with the use of combined cycle technology will provide combined energy generation, high gas fuel efficiency and overall facility efficiency. The designed capacity of the GTU is 57 MW.

The fuel supply for new power unit will be performed by the ENERGAS comprehensive system which comprises block-type gas treatment station (BGTS) and booster compressor station (BCS) consisting of two units. BGTS is intended to filtration, pressure reducing and technological metering gas before its feeding into BCS. Booster units will ensure the required fuel parameters for turbine – in terms of pressure (3.1 MPa), temperature (+60°C) and flow rate (12,000 kg / h).



The Aktobe Central Heating and Power Plant is the only source of district heating in Aktobe, the largest city in Western Kazakhstan. In 2020, Aktobe CHPP produced 927.9 million kWh of electricity, which is more than 12% of the region's consumption. Electric and thermal capacity – 118 MW and 878 Gcal / h, respectively.

At the moment, there are six steam turbines and nine boilers installed here. The need for reconstruction and upgrade of the power plant, built in the 40s of the last century, is because some of the main and auxiliary equipment have entirely exhausted their resource.

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