Some Common Sense Introduction to Condensing Steam Turbines

The condensing equipment is an essential component of a condensing steam turbine. Due to factors such as design, installation, maintenance, and operational mechanisms, low vacuum in the condenser frequently occurs during operation. If the condenser vacuum falls too low, not only will the effective enthalpy drop of steam within the unit be reduced, but also the thermal efficiency of the cycle will decline, leading to an increase in the exhaust steam temperature, deformation of the exhaust cylinder, and vibration. Under normal operating conditions, the relationship between the exhaust pressure and exhaust temperature of the condenser follows that of saturated steam.

What are the characteristics of a condensing steam turbine?

As the primary condensing equipment in a condensing steam turbine unit, the condenser’s task is to establish and maintain a high vacuum at the turbine exhaust port, condense the turbine exhaust steam into water, and then pump this condensed water via a condensate pump to the deaerator, where it is converted into boiler feedwater. The vacuum level of the condenser directly affects the normal operation of the unit. It can be said that the operational performance of the condenser has a direct impact on the safe and economical operation of the steam turbine unit.

Introduction to Relevant Knowledge Points for Turbine Installation

Determination of the critical speed for turbine installation: When the vibration meter is started at a speed between 3,400 and 3,900 rpm, the amplitude should not exceed 0.15 millimeters. Turbine installation vibration measurement: As the starting speed increases to 5,550 rpm, use a vibration meter to measure the amplitude—vertically, axially, and laterally—near the bearings; the amplitude should not exceed 0.03 millimeters.

Main Procedures for Turbine Installation

The main procedures for turbine installation include acceptance of the foundation and equipment, installation of the turbine unit itself, and installation of other systems (including installation of unit accessories and flushing of the oil system). The cleaning of steam pipelines and flushing of the hydraulic oil system consist of three parts.

Technical Key Points for Turbine Installation

Key technical points for the combined installation of low-pressure cylinders in steam turbine installation: The combined assembly of the low-pressure outer lower cylinder includes the following steps: First, position the rear section of the low-pressure outer lower cylinder (on the motor side) and the front section of the low-pressure outer lower cylinder (on the steam side) respectively. Then, adjust their horizontal alignment, raise their elevation, and locate their center. Once these requirements are met, separate the front and rear sections by a certain distance and thoroughly clean and inspect the vertical mating surfaces...

What is the working principle of a small steam turbine generator set?

A small steam turbine is a rotary prime mover that converts the thermal energy of steam into mechanical energy. It belongs to the machinery industry and serves as the primary power equipment in modern thermal power plants. It is also used in the metallurgical, chemical, and marine propulsion industries. The basic principle of a small steam turbine is as follows: Steam at a certain pressure and temperature enters the turbine and flows through nozzles, where it expands, gaining high rotational speed. The high-speed steam then passes over the moving blades on the turbine rotor, doing work in the process.