Mollier Diagram Steam Turbine

Th ere are special steam tables and Mollier diagrams which provide the state of steam at various pressure and temperatures. Ideal isentropic expansion is represented on the Mollier diagram by a vertical line.

Section Of Mollier Chart Showing Expansion Line Download Scientific Diagram

If steam condition exit the turbine in wet steam or where steam condition at bellow saturated line of Mollier diagram named condensing turbine.

Mollier diagram steam turbine. Theso-calledheatdiagramorpdiagraminwhichthe stateof a mass of steam is represented by a point on aplanewith absolute temperature and entropy asrectangularcoor-. Turbine work out hc hd Heat in. Turbine expansion process on the H-S Mollier diagram drawn using SteamTab 40.

The Mollier diagram also called the enthalpy h entropy s chart or h-s chart is a graphical representation of thermodynamic properties of materials. Red lines give the dryness fraction in the saturated zone. Then take a Mollier diagram and mark all the four.

Inlet enthalpy h 1 13511 BTUlb. Turbine work out Pump work hc hd hb ha Heat i. On Mollier diagram constant pressure lines diverge from one another as shown in the figure.

The Mollier diagram is a tool used by engineers to predict theoretically the performance of systems and installations. The available energy that can be converted into work is shown on the Mollier diagram as a vertical line hc hd. An Introduction to Steam Turbine.

Ideal simple Rankine cycle thermal efficiency is represented by. Calculate online thermodynamic and transport properties of water and steam based on industrial IAPWS-IF97 or scientific IAPWS-95 formulation. Steam exhaust into the condenser is 012 bar at absolute pressure and has a constant vapor moisture content of 81.

It is known that in ideal conditions a steam turbine has a power output rate of 30000 kW and a mass flow rate of 264 kg s. Mollier chart is drawn between enthalpy h and entropy s. Condition exit the turbines.

The procedure is as follows. Designation Quantity Note and additional information 1 2 Turbine type figure 3 CURTIS 3 4 REQUIRED CONDITION 5 6P kW535 7 N RPM 4000 8 pi bar A 42 9ti C 400 10 po bar A 13 11 12 STEAM DATA 13 14 hi kJkg 3210 See steam Mollier diagram 15 hos kJkg 2890 See steam Mollier diagram. The temperature-entropy diagram is much inferior to the Mollier diagram for the quantitative solution of problems in steam-turbine design.

STEAM TURBINE CALCULATION SHEET Page. Specific Enthalpy of the steam inlet and outlet. The Mollier diagram is useful when analyzing the performance of adiabatic steady-flow processes such as flow in nozzles diffusers turbines and compressors.

All that is required are calibrated pressure and temperature gauges on the inlet and discharge and a Mollier diagram or steam tables. In the diagram below. Inlet steam pressure 600 psia Inlet steam temperature 700 oF Exhaust steam pressure 140 psia Exhaust steam temperature 430 oF Inlet steam flow rate 75000 lbhr From Steam Tables.

We must use special tables and diagrams that give us the enthalpy of steam based on the pres-sure and temperature of the steam. 1 STEAM CONSUMPTION No. Moving blades also act as nozzles.

Point 1 Turbine Inlet Point 2 LP exhaust for process heating Point 3 Exhaust to CW condenser. Steam Turbines Problem 1 Make an observation that out of the 10 solved examples and the 8 exercise problems of this chapter only 4 problems required the reference to the Mollier Diagram enthalpyentropy chart for steam. Download scientific diagram Section of Mollier chart showing expansion line from publication.

This process can be followed on an enthalpy-entropy H-S diagram known as a Mollier chart. Download and print Mollier Diagram for Water - Steam. If steam condition exit the turbine in dry or still in superheated condition or at upper of saturated line of Mollier diagram named back pressure turbine see figure 7.

Reaction turbine Steam expands in both the stationary moving blades. Willard Gibbs suggested using a surface with entropy pressure and total heat as co-ordinates. In the example diagram the path from Point 1 to Point 2 represents typical BPST operation at a chemical plant pulp and paper mill oil refinery or food processing facility.

Green lines show steam temperature. The Mollier diagram is a projection of this surface on the pressure plane and thus has entropy and total heat as co-ordinates. Calculate properties of combustion gases.

This video tutorial for SESM2011-Thermodynamics covers how to use steam tables and the Mollier chart by looking at the specific example of finding the enthal. Conditions and h 2 as the exhaust steam conditions. The diagram below can be used to determine enthalpy versus entropy of water and steam.

It is a graphical representation of steam tables in which specific entropy is plotted along the ordinate and specific enthalpy along the abscissa. The theoretical steam rate is the amount of steam in LBS per hour required to produce one 1 horsepower if the isentropic efficiency of the turbine is 100. Pump work is often left out of this equation and thus.

For inlet conditions determine h 1. This video session is made to make the students conversant with basic concepts of Turbo MachinesI acknowledge my sincere thanks to the authors and referenc. It is relatively easy to determine the efficiency of any operating turbine in the field if the exhaust conditions are superheated.

Application examples of using the Mollier Diagram. Locate these four problems. Actual expansion of steam always involves some losses represented by an increase in entropy.

Superheated 600-psig steam at 700F Point 1 expands as it passes through the turbine and is exhausted at a. Mollier diagrams are named. Condition monitoring of steam turbines by performance analysis.

Steam expansion in the turbine on the h-s Mollier chart You can switch back to the summary page for this application by clicking here. The actual steam rate is the amount of. Mollier diagrams are graphical representations of the thermodynamic properties of materials involving Enthalpy as one of the coordinates.

Non-condensing steam turbine using Mollier method andor steam tables Input Data. The turbine output on the Mollier diagram represented by the vertical straight line in ideal conditions. Mollier enthalpy-entropy chart for steam US units.

Blue lines give absolute steam pressure. As shown in Figure 5135 it is determined by dividing the theoretical enthalpy Δh isentropic into the amount of BTUsHR in horsepower. The diagram is divided into two portions by a somewhat horizontal line termed as saturation curve.

High axial thrust is produced.

Turbine Expansion Process On The H S Mollier Diagram Drawn Using Download Scientific Diagram