The upgrade of the steam turbine of the PT-80 series manufactured by the Ural Turbine Works implies documentation for the previously developed and service-tested units for other steam turbines and new patented modern technical solutions aimed to improve and upgrade separate units, parts of the turbine, and related equipment.
Since 1980, about 90 steam turbines of this series have been produced, most of which have already exhausted their fleet life and become outdated.
The upgrade of the steam turbine of the PT-80 series allows to get a modern turbine unit using buildings, foundations for equipment, crane facilities and replacing only the outdated equipment with new, more advanced one.
The Ural Turbine Works offers a comprehensive approach to the PT-80 series steam turbine upgrade, which includes a wide range of technical solutions to upgrade the turbine units in a more timely, efficient, and cost-effective manner.
The scope of the PT-80 series steam turbine upgrade includes
The upgraded high-pressure cylinder has the same dimensions as the dismantled cylinder. This ensures that it can be installed on the existing foundation without any reconstruction. The number, position, and dimensions of nozzles on the high-pressure cylinder body are identical to the body being replaced.
The high-pressure cylinder has straight-through design, its flow part consists of 17 steps - single-blade-row control step and 16 pressure steps.
The upgraded flow part of the low-pressure cylinder is installed in the existing low-pressure cylinder body. The new nozzle block of the low-pressure cylinder is installed in the existing bore of cylinder body, and diaphragms are replaced with the new ones featuring large output areas. To allow for the installation of the new diaphragms, the low-pressure cylinder holders are replaced with the new ones that are subsequently installed in the existing bores of cylinder body.
New design of the control valves and low and high-pressure cylinder seats with increased flow cross-sections to provide increased steam flow.
Installation of an upgraded cam-operated switchgear with a high-rigidity frame and bearings with increased load-bearing capacity.
The rotor of upgraded design with high-pressure blading allowing to increase reliability.
The rotor of upgraded design with low-pressure blading allowing to increase reliability.
In the new system, the current coming from the turbine rotor is branched off by brush current collectors insulated from the bearing body, grounding is done by a separate wire with its inclusion in the circuit of the ammeter and current relay, which allows to control the ground current.
Installation of the layered thrust pads in a thrust bearing allows to significantly increase the bearing load capacity by reducing the thermal and power deformation of the pads, which is ensured by forced oil cooling of the hottest part of the thrust pads as well as the use of steel bearing base.
The type of the high and low-pressure cylinder seals is determined by the customer (honeycomb, labyrinth, radial, axial-radial, and metal-ceramic seals are available).
The upgrade of the turbine has a high degree of customization and is tailored according to specific customer requirements. All units feature advanced design.
