21 October 2022

This process equipment is part of the ENERGAS comprehensive gas treatment system which will provide the Siemens SGT-800 turbine with fuel with specified design parameters in terms of purity, temperature, pressure and flow rate.



In the Republic of Kazakhstan, Aktobe CHPP is being enlarged. Here, a cogeneration power unit has been created - a gas turbine unit (GTU), integrated into the process flow scheme of the facility to operate in a combined cycle.

The main generation will be provided by a Siemens SGT-800 industrial gas turbine with generator with an electric capacity of 50 MW. The SGT-800 turbine combines robust design, high efficiency and low emissions. Due to its high exhaust energy, it is effectively applied in the combined cycles.

From turbine, exhausted hot gases (fuel combustion products) will flow into the waste-heat boiler manufactured by JSC Machine-Building Factory of Podolsk to generate steam with a pressure of 3.0 MPa and a temperature of 420°C in an amount of 70 tons per hour. The resulting superheated vapour of medium pressure is sent to the existing steam turbines of Aktobe CHPP for secondary electricity generation.

Thereby, the use of combined cycle technology gives the combined energy generation and maximum fuel effectiveness, increases the environmental friendliness and efficiency of the power plant. The designed capacity of the GTU is 57 MW.

To the fuel supply for new power unit, the ENERGAS comprehensive gas treatment system has been installed here which will provide the quality of gas in accordance with the specified parameters for purity, temperature, pressure and flow rate. The main elements of this system are a block-type gas treatment station (BGTS) and booster compressor station (BCS).

At present, adjustment works were carried out at the BGTS. Pre-start activities were completed with own (individual) testing. There has been checked the functioning of process, measuring and analytical, electrical equipment and automated control system. Integrated tests of the station as part of the power unit are planned, which will take place under load – in conjunction with the SGT-800 turbine.



The BGTS, manufactured by ENERGAS under a special project, is intended for metering, filtration and pressure reduction of gas. The throughput of the station is 15,433 m3 / h – similar to the rated fuel consumption of GTU.

Process unit is equipped with separation system with a two-stage coalescing filters, the trapping of condensate and mechanical impurities occurs here in automatic mode. Gas filtration efficiency is 99.9% for particles larger than 3 microns. Subassembly for gathering and storage of purification products includes an underground drainage reservoir (storage tank) with a volume of 1 m3, a liquid level control device and equipment for removing condensate and sludge into a mobile cistern.

In situations where the pressure in the supply pipeline exceeds the design parameters, the gas flows through the reducing module. This element of BGTS guarantees a decrease and a stable maintenance of the pressure at a required level, as well as excludes its differences at the inlet to compressor units of the BCS.

To measure the volume of fuel entering the power generating unit, the BGTS is equipped with a two-line process gas-metering unit with a relative error of no more than 2%. Data from him is transmitted via communication channels to the upper level of the APCS.



The gas treatment station is additionally equipped with an outlet fuel quality control subassembly with measuring and analytical equipment. The BGTS is housed in a separate all-weather block-box with the integration of elements on a single frame, equipped with systems of working and emergency lighting, premise heating and ventilation, safety systems.

After preliminary treatment, the gas flow is directed to the ENERGAS BCS, which consists of two packaged compressor units intended to compress and feed fuel to the GTU turbine at a pressure of 3.1 MPa. Gas-booster units will operate in 1+1 mode (one machine in operation, other in the hot-standby).



Comprehensive commissioning of the gas treatment and fuel supply system for the new GTU at Aktobe CHPP – erection supervision, starting-up and adjustment, own and integrated tests as well as training of operational personnel are carried out by the specialists of ServicENERGAS (ENERGAS Group).

REFERENCE:

The Aktobe Central Heating and Power Plant is the only source of district heating in Aktobe, the largest city in Western Kazakhstan. Electric and thermal capacity – 118 MW and 878 Gcal / h, respectively.

Previous news

Back to the list

Next news