Case study

Upgrading district heating by gas turbine combined heat & power

JSC Tashkent HPP

ProjectTashkent Thermal Power Cogeneration Plant
CapacityElectricity :113 MWe, Heat Output: 195 Gcal/h
CountryUzbekistan
Implemented SolutionH-25 Gas Turbine Cogeneration

ISSUE

Urgent needs for modernization of aging cogeneration plants with low efficiency and availability

Each municipality in East Europe, Central Asia, and other countries with district heating network supply not only power but also hot water and steam as social infrastructure. One thermal power plant in Uzbekistan acts as a cogeneration power plant supplying power together with steam to neighboring factories as well as hot water for district heating, accounting for 15 % of heat demand in the city which covers approximately 300,000 citizens. The existing 22 MW steam turbine and 12 units of boilers, built in the 1938-60s, have seen a drop in its thermal efficiency and availability. Urgent modernization of the facility is required to reduce natural gas consumption while ensuring a stable supply of steam and hot water.

 A cogeneration power station in Central Asia

Difficulty of funding for plant modernization

The owner of the plant has been serving to the local community in providing low-cost power and heat for decades, continuing their effort to keep their facilities in good condition. Funding for modernizing aged facilities has been always the issue. That is why it is essential to maximize the benefits of modernization while minimizing the capital investment.

SOLUTION

KEY POINTS TO THE SOLUTION

  • H-25 gas turbine for combined heat and power plants
  • Efficient use of fuel while ensuring a stable supply of heat and power
  • Support for finance from Japan

H-25 gas turbine for combined heat and power plants

H-25 is proven and reliable gas turbine with is technology backed by 30 years of operational experience. With its ability to provide higher exhaust heat to produce steam and hot water, the H-25 gas turbine is able to provide sufficient heat suited for district heating for high demand season.

 Power and heat generation by H-25 gas turbine

Efficient use of fuel while ensuring a stable supply of heat and power

The addition of an H-25 gas turbine cogeneration system increases the capacity of power supply of the plant. This project is moving forward with a plan to expand to a total of three gas turbines (more than 90 MW increase), while maintaining the use of existing steam turbine generators and boilers. Increasing power capacity effectively reduces the fuel gas burnt by other aged thermal power plants in the region, which in turn reduces both natural gas consumption and CO₂ emissions in the city.

Support for finance from Japan

Mitsubishi Power can support its customers’ financing efforts by initiating arrangement and coordination with JBIC*, JICA**, and other organizations. Japanese yen loan by JICA is provided for the latest 2 units of Tashkent thermal power cogeneration plant projects. *JBIC: Japan Bank For International Cooperation **JICA: the Japan International Cooperation Agency

 Support for finance from Japan

OUTCOME

  • For further details about outcome and solution, please refer the below article.
  • The article explains:
    • Why H-25 is better choice for the combined heat and power project
    • The expected CO₂ reduction volume
    • How to support financing arrangement