What is high-pressure steam turbine?

HP Turbine (high-pressure turbine) is usually double-flow turbine element with an impulse control stage followed by reaction blading in each end of the element. There are about 10 stages with shrouded blades in the HP turbine. It the produces about 30-40\% of the gross power output of the power plant unit.

What is first stage pressure in steam turbine?

The first stage pressure on GE steam turbines is measured just downstream of the first stage buckets/blades, (just upstream of the second stage nozzle). It is used as a relative measure of steam flow for valve testing and also used as a measure of boiler heat release.

How do I lower the pressure in my steam?

Reducing Steam Pressure A common way of lowering pressure is by throttling down the size of the steam passageway. For the most basic pressure reduction, it is possible to simply use a conventional globe valve in a fixed partly-open position, or by inserting an orifice plate into the flow of steam.

What is pressure at inlet of turbine?

Optimum pressure varies with the gas turbine inlet temperature, but ranges from 0.4-1.0 MPa (4-10 atm). Depending on the pressure and temperature of these combustion gases, considerable net power may be obtained from the turbine-compressor unit thus giving rise to a combined cycle power plant.

How is steam pressurized?

Most industrial steam systems are closed systems. When water vaporizes to become steam in the boiler, the expansion pressurizes the system. Steam is forced out of the boiler by its own pressure and is carried by piping to whatever devices are to be employed for heating or processing.

What does a high pressure turbine do?

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 high pressure turbine rotor?

The high-pressure turbine rotor or the inventive high-pressure turbine rotor manufactured by means of the inventive method therefore has a rotor base body with a plurality of turbine vanes formed thereon. The turbine vanes have a duct system, which is provided in the interior of these turbine vanes for tempering same.

What happens to steam when it leaves the turbine?

When the steam leaves the turbine, its temperature has dropped, and it has lost almost all its elevated pressure. Some of the pressure drop also occurs across the diaphragm, which is a component between the outer wall and inner web. The diaphragm’s partitions direct the steam toward the rotating blades.

What is the effect of 10\% increase in steam pressure on efficiency?

A 10\% increase in steam pressure will reduce the steam consumption by about 1\% in a condensing steam turbine and by about 4\% in a back pressure steam turbine. The effect on efficiency for 10\% increase in pressure is about 1.5\% for a condensing steam turbine and 0.45\% for a back pressure steam turbine.

How does steam pressure affect the oil temperature in a bearing?

When the inlet steam pressure is high, the heat of the steam is transmitted to the steam end inlet bearing through the shaft. Although the jacket in the bearing housing does reduce the oil temperature in the bearing housing, it cannot effectively reduce the oil temperature at the shaft/bearing interface.

Why is speed variation important for steam turbines?

Speed variation or speed adjustment capabilities are also important for steam turbines. Currently, steam turbines are widely used in different driver applications for mechanical drives and power generation units and produce nearly 1 million (MW) of capacity worldwide.