Capstone Microturbines

Capstone Advanced Technologies

Capstone Microturbines are advanced low-power gas turbines with excellent technical and operational features designed for onsite power and heat generation. Unparalleled consumer properties, comprehensive system engineering and implementation of innovative technologies protected by more than 100 patents make Capstone microturbines a separate class of power generating equipment. Microturbines perfectly meet requirements of today's distributed generation market.

The microturbine engine has only one moving part - single rotating shaft with generator, compressor and turbine installed on it. The turbine engine does not use gears or other mechanical drives.

The shaft is supported by patented air bearings that ensure record-high shaft velocity - 96 000 rounds per minute. An air bearing consists of two parts. External cylindrical part is made of high-temperature alloy. Internal part consists of thin springs and a foil. The springs provide counterforce to the foils and air, effectively keeping the gas turbine shaft centered on its cushion of air. When the shaft reaches about 2 000 rounds per minute a boundary layer of air forms between the foils and the shaft protecting it from wear and tear. This innovative technology eliminates the need in lubricating oil allowing to save a significant part of operating costs. In addition, a small number of mating parts minimizes the risk of turbine engine components damages and ensures reliable and safe operation of microturbine units. This also contributes to extended overhaul life (up to 60 000 hours). High shaft rotation speed decreases noise and vibration levels during operation.

Low combustion temperatures reduce CO and NOx emissions that do not exceed 9 ppm making microturbines on of the cleanest types of generating equipment. Another unique feature of Capstone microturbine units is the arrangement of their components. Compact engine body houses compressor, combustion chamber, recuperator, turbine assembly and permanent magnets of generator. Air cooling of the generator helps increase overall reliability of the system and ensure efficiency of operation. A gas-gas heat exchanger (recuperator) increases electrical efficiency of gas turbine units to 35%.

The recuperator recovers thermal energy from exhaust gas to preheat combustion air, thus reducing fuel consumption by almost two times. An advanced microprocessor-based control system of Capstone gas turbines allows for continuous unmanned operation. The control system may be equipped with a GSM modem for remote operation control and condition monitoring. This makes microturbines an ideal equipment for distributed power plants in remote areas, such as broadcast relay stations or gas pipelines. Combination of these features ensures reliable operation of CHP plants with minimal maintenance downtime.

Overhaul life of microturbines is 60 000 hours and maintenance intervals are 8 000 hours or once a year, given that the operation requirements are observed. Various modifications of microturbine units provide unpaired flexibility in broad range of decentralized power supply projects.

Price is determined by the individual properties of each project and can be quoted by BPC’s specialists based on filled in questionnaires available here.