EbsWizard

The "EbsWizard" is given under the menu "?". While creating a model, it helps you by providing sample (mostly power plant) models. Some models can be parameterized automatically.

In the first step, select the category of the model:

Upon clicking on "Next>" a second selection screen appears, where you can select a specific example for the selected category:

Models marked with "*“ include a mask for the input of some key parameters for the cycle.

Upon a click on "Next>" the corresponding circuit opens. After this screen has been prepared (e.g. "Block 750" under "hard coal"), a third dialog screen appears, where you can set the parameters:

After entering the parameter data, a simulation is performed automatically and the dialog is closed, so that now you can edit the circuit further.

In order to ensure that the parameters of the circuits can be set, an EbsScript with the name "Init" is to be created and the function "wizardBox" is to be used in this EbsScript. A sample EbsScript is given in the file Block750.ebs.

 

EbsConfigurator

In the category EbsConfigurator, you find two subcategories:

• EbsConfigurator_CCGT - for representing combined-cycle plants and
• EbsConfigurator_SteamCogenerationPlant - for representing CHP plants for steam production.

Both include prefab macro models.

After "Finish>", the corresponding model is opened. The models of EbsConfigurator consist of one active and several passive sheets. The passive sheets contain the individual macro models (e.g. the gas turbines, HRSG, etc. in the case of combined-cycle) out of which the overall model can be configured.

To do so, the respective macro models have to be copied into the active sheet (named <Calculation>).

Arrange the copied macros on the <Calculation> sheet as desired. Then connect the macros to each other automatically by means of the button “Connect auto-connectors” (see Component 132: Automatic connector). The same can be achieved by selecting the menu entry “Edit Connect open connectors”. This results in the creation of all pipes necessary to make your model ready for calculation.

 

EbsConfigurator for CHP plants for steam production (EbsConfigurator_SteamCogenerationPlant)

What can be represented by means of this EbsConfigurator "construction kit"?

This construction kit allows to represent three types of steam CHP plants.

a) How to create a model of a CHP plant with extraction condensing steam turbine

To create a model of such a CHP plant you have to use the following macros:

 

b) How to create a model of a CHP plant with back pressure steam turbine

To create a model of such a CHP plant you have to use the following macros:

- With or without reheat

- Steam turbine modelled with components 6 or 122

- With or without multiple moving extraction

 

c) How to create a model of a CHP plant with simple back pressure steam turbine

To create a model of such a CHP plant you have to use the following macros:

· One Steam boiler from sheet <Boiler>

· The simple back-pressure steam turbine from sheet <Backpressure_Turbine>

· One Feed-water tank without any HP pre heaters  from sheet <Feedwater>

· The condensate system with no LP pre heaters from sheet <Condensate>

· The (only this!) steam consumer "Consumer for simple BPT" or "Consumer LP"  from sheet <Consumer>

 

 d) Additional notes

1) The necessary macros from the sheets <Additionals> and <PowerCalculation> are already included in the prepared calculation sheet <Calculation>.

2) Each turbine macro has the following connectors or inputs / outputs resp.:

• HP steam inlet
• Reheat macros only: Reheat steam output and inlet
• HP steam outlet HP preheated 1
• HP steam outlet HP preheater 2
• LP1 steam outlet to HP consumer
• LP2 steam outlet to LP consumer
• LP3 steam outlet to IP consumer
• LP1 steam outlet to LP preheater 1
• LP2 steam outlet to LP preheater 2
• LP3 steam outlet to LP preheater 3
• Condensate macros only: Condensate outlet
• Steam outlet to feed water tank

Which of these connectors will be used or connected resp. depends on the macros selected from the sheets <Feedwater>, <Condensate> and <Consumer>. Connectors which fit together will be connected via automatically generated pipes, the others will remain unconnected.

3) The internal efficiencies of the extraction steam turbines consisting of components 122 have to be entered manually. The automatically calculated internal efficiency according to "SCC" (Spencer Cotton Cannon) will be included in the next patch or release.

 

4) In the case of the simple back-pressure turbine, only one consumer is possible. Here you can choose between the consumers "Consumer for simple BPT" and "Consumer LP".

 

5) After having copied all of the macros to the Calculation sheet, click the "Connect auto-connectors" button, to create all connecting pipes. After this it will be necessary to move the connected macros to create a well arranged model or to avoid overlapping pipes. Maybe you want to insert some new points in some pipes (shortcut is the "<" key).

 

Which rules have to be followed?

See also the passive sheets <Method_english> respectively <Method_german>.

1. The model has to be assembled as described above.
2. Then the structure of profiles (see below) has to be created by clicking the button “Create Profile Structure”.
3. Configure the model by adjusting the specification values of all macros. To change any of the specification values of a macro just open its property dialog by double clicking the macro. The listed specification values of each macro can be changed, such as pressures, temperature differences and efficiencies.
4. The performance of the cycle is defined by
   a. the inlet mass flows M1HP, M1IP, M1LP defined by the consumer macros
   b. and (if present) by QEL of the condensation turbine macro.
5. Click the button “Simulate all Profiles” to do all design- and part load-calculations.
6. After the simulation, the message "Aftercooler_1 in Macro CondensateSystem was local designed in profile with ID = 1" will be shown for information only.
7. The profiles can also be simulated individually. It must be started with the design profile. Next, the profile Consumer_Mmax must be simulated, in which the heat exchanger FWWT in the macro "Condensate system" is designed to heat the injection water. Then, the design profile must be re-simulated, and then the Consumer_Mmax profile must be re-simulated. In each case instructions are displayed. Then the other profiles can be simulated.
8. If, in addition to the specification values of the macros, further inputs are desired, these can only be entered via the respective components inside the macro. To do this ungroup (most macros are groups actually) and open the macro. Thus you might e. g. change the temperature differential, the  fuel definition, characteristic lines etc. of a component.
9. The main results are displayed in the Results-Text Field (from sheet <Additionals>). To see results of components or pipes inside a macro, ungroup and open the macro. 
      

WWhat is the purpose of the sub profiles?    

 

      b) In the case of the CHP plant with extraction condensing steam turbine, there are four sub profiles:

· Consumer_Mmax -> consumer with maximum steam quantity

· Consumer_Mmin -> consumer with minimum steam quantity

· Consumer_M0 -> consumer with no steam, e. g. pure condensation operation

 

· Comsumer_another_M -> consumer with steam quantity between minimum and maximum

The profiles are created automatically by means of the button "Profile Structure". The specification values of all macros have to be adjusted by you for all profiles for your special requirements.

      c) In the case of the CHP plant with back-pressure steam turbine, there are three sub profiles:

· Consumer_Mmax -> consumer with maximum steam quantity

· Consumer_Mmin -> consumer with minimum steam quantity 

· Comsumer_another_M -> consumer with steam quantity between minimum and maximum.

The profiles are created automatically by means of the button "Profile Structure". The specification values of all macros have to be adjusted by you for all profiles for your special requirements.

      What are the limitations ?

      a) In the case of the CHP plant with extraction condensing steam turbine and “Cooling_tower_system“, it is advantageous to set the design pressure for the condenser to 80 - 100 mbar. If the design pressure would be higher (e.g. 200 mbar), the condenser performance might be too small in part load operation, so that the simulation might terminate with an error message at the cooling tower: “The cooling water input stream is out of range (P, M or H).” In this case, the upper temperature difference of the condenser can be reduced, and/or the electrical output of the steam turbine can be increased, and/or the design can be done again with reduced mass flow M100 (condenser is enlarged).
b) Some connectors (component 132) of the macros Boiler, Steam Turbine, Condensate System and Feed Water System must be preset with M=0. These connectors are those that can remain unconnected in the overall model (they have no pipe connected). If you supply values M>0, this macro must not be used for an overall model anymore. Use a new copy out of the sheets then.
 
Example of a CHP plant created with the EbsConfigurator:
- With reheat
- With HP-Preheater 1
- With 3 moving extractions
- Components 122 used to represent the turbine
- With HP- IP- and LP-consumer
- With LP-preheater 1 and feed water heat exchanger
- QEL of turbine set to 300 MW
- With Condenser with cooling tower
- HP consumer steam flow set to 150 t/h
- IP consumer steam flow set to 100 t/h
- LP consumer steam flow set to 50 t/h