What is low pressure turbine rotor?
The low pressure rotors, consisting of a series of alloy steel discs shrunk on a shaft and keyed in position, are machined from alloy steels forgings. Low pressure (LP) steam turbine disc cracking caused by stress corrosion is experienced worldwide in rotors used in both nuclear and fossil fuel power plants.
What is a low pressure turbine?
LPT is a turbine designed specifically for low values of pressure ratio (1.05-1.30), allowing extraction of residual exhaust energy downstream. of the turbocharger, whilst minimising negative engine performance impact due to increased exhaust back pressure.
Where is the low pressure in the turbine engine?
The front compressor, or low-pressure compressor, is in front of the high-pressure compressor. The turbine that drives the low-pressure compressor is behind the turbine that drives the high-pressure compressor.
Which type of turbine is used in low pressure stages?
Each LP Turbine (low-pressure turbine) is usually double-flow reaction turbine with about 5-8 stages (with shrouded blades and with free-standing blades of last 3 stages). LP turbines produce approximately 60-70% of the gross power output of the power plant unit.
What is the difference between high pressure and low pressure turbine?
The high pressure turbine is designed to efficiently extract work out of the high pressure steam as it initially enters the main propulsion turbines. The low pressure turbine is designed to efficiently extract work out of steam which is exhausting out of the high pressure turbine at a lower pressure.
What is a low pressure turbine in jet engine?
A low pressure turbine within a turbofan jet engine consists of five repeating stages. The turbine inlet stagnation temperature is 1200 K and the inlet stagnation pressure is 213 kPa. It operates with a mass flow of 15 kg s−1 and generates 6.64 MW of mechanical power.
How many stages does a low pressure turbine have?
A low pressure turbine within a turbofan jet engine consists of five repeating stages.
What is the difference between high pressure and low pressure HPLC?
A low pressure gradient system consists of one pump with an integrated mixing block that enables the delivery of up to four different solvents at the same time. High pressure gradient systems are composed of two pumps. These systems are limited to two solvents which are pumped by the separate pumps.
What are the 3 stages of turbine?
In modern turbines, three types of staging are employed, either separately or in combination: (1) pressure (or impulse) staging, (2) reaction staging, and (3) velocity-compound staging.
What causes low pressure in HPLC?
Low pressure usually results from air in the pump, a faulty check valve, or a leak. First, check for the obvious: make sure the flow rate is set properly and that there is sufficient mobile phase in the reservoirs.
What happens when low and high pressure mix?
In general, low pressure leads to unsettled weather conditions and high pressure leads to settled weather conditions. In an anticyclone (high pressure) the winds tend to be light and blow in a clockwise direction (in the northern hemisphere).
What makes up the low and high pressure rotors?
The low-pressure rotor consists of the low-pressure turbine (LPT), which drives the low-pressure compressor (LPC) via a con- centric drive shaft through the high-pressure rotor. The high-pressure rotor is formed by the high-pressure turbine driving the high-pressure compressor (HPC).
How does the low pressure stage of a LP turbine work?
In LP turbine the low-pressure stage receives steam (this steam is usually superheated steam – point E at the figure; ~ 1.15 MPa; 250°C) from a moisture separator-reheater (MSR). The steam from the HP turbine must be reheated in order to avoid damages that could be caused to blades of steam turbine by low quality steam.
How are high pressure and low pressure steam turbines related?
High pressure and low pressure stages of the turbine are usually on the same shaft to drive a common generator, but they have separate cases. The main generator produces electrical power, which is supplied to the electrical grid. Schema of a steam turbine of a typical 3000MWth PWR.
What is the point F of a steam turbine?
The steam is in a partially condensed state (point F), typically of a quality near 90%. High pressure and low pressure stages of the turbine are usually on the same shaft to drive a common generator, but they have separate cases.