To create (Heat Recovery Steam Generator) HRSG Simulink Model

Hi, so I desired to create HRSG model for simulation purposes (one of the objectives for Final Year Project (FYP), unfortunately since I have a novice background in the mechanical field ( I'm in electrical engineering field), I have no idea where /how to start. Could anyone give me some pointers what info should I look for/ or suggest any open sources / materials of HRSG simulink models to kickstart my project?

[Umar]

Hi NG,

It sounds like a complicated project which will require a lot of hardworking and research efforts to achieve your goal. I am very confident that you will be able to achieve this goal. Creating a Heat Recovery Steam Generator (HRSG) model in Simulink involves simulating the heat recovery process in a power plant. I will use various blocks available in Simulink to represent different components of the HRSG system. Below is a step-by-step guide on how to create an HRSG model using blocks in Simulink. Launch MATLAB and open Simulink by typing simulink in the MATLAB command window. Create a new Simulink model by clicking on File -> New -> Model in the Simulink window. Then, add following blocks such as

Controlled Heat Flow Rate Source block

For more information on Controlled Heat Flow Rate Source block, please refer to

https://www.mathworks.com/help/simscape/ref/controlledheatflowratesource.html?searchHighlight=Heat%20Source%20Block%3A&s_tid=srchtitle_support_results_4_Heat%20Source%20Block%253A

Connection:Connect the Controlled Heat Flow Rate Source block to the input of the Heat Exchanger Block to provide the heat input to the system.

Configuration:Set the parameters of the Controlled Heat Flow Rate Source block according to the desired heat flow rate profile or control strategy.

Heat Exchanger Block

For more information on heat exchanger block, please refer to

https://www.mathworks.com/help/autoblks/ref/heatexchanger.html?searchHighlight=Heat%20Exchanger%20block%20&s_tid=srchtitle_support_results_2_Heat%20Exchanger%20block%20

Connection:Connect the output of the Controlled Heat Flow Rate Source block to the input of the Heat Exchanger Block to simulate the heat exchange process.

Configuration:Configure the Heat Exchanger Block parameters such as heat transfer coefficients, areas, and effectiveness based on the specific heat exchanger model being simulated.

Steam Turbine and Governor block

For more information on Steam Turbine and Governor block, please refer to

https://www.mathworks.com/help/sps/powersys/ref/steamturbineandgovernor.html?searchHighlight=Steam%20Generator%20block%20&s_tid=srchtitle_support_results_1_Steam%20Generator%20block%20

Connection:Connect the output of the Heat Exchanger Block to the input of the Steam Turbine and Governor block to model the power generation process.

Configuration:Set the parameters of the Steam Turbine and Governor block to define the turbine characteristics, governor response, and control settings.

Condenser and Evaporator Heat Transfer block

For more information on Condenser and Evaporator Heat Transfer block, please refer to

https://www.mathworks.com/help/hydro/ug/condenser-evaporator.html?searchHighlight=Condenser%20block&s_tid=srchtitle_support_results_1_Condenser%20block

Connection:Connect the output of the Steam Turbine and Governor block to the input of the Condenser and Evaporator Heat Transfer block to simulate the heat transfer in the condenser and evaporator.

Configuration:Configure the parameters of the Condenser and Evaporator Heat Transfer block to model the heat transfer coefficients, areas, and heat exchange processes accurately.

Simulate the Model

Once the model is set up with all the necessary blocks and connections, run the simulation by clicking on the Run button in Simulink.

I will create a Heat Recovery Steam Generator (HRSG) simulation for plotting results using Matlab by providing snippet code below.

>> % Define parameters

time = 0:0.1:10; % Time vector from 0 to 10 with step size 0.1 temperature_inlet = 300 + 50*sin(2*pi*time/10); % Inlet temperature variation pressure_inlet = 10 + 2*cos(2*pi*time/10); % Inlet pressure variation

% Simulate HRSG process

heat_transfer = 0.8; % Heat transfer efficiency temperature_outlet = temperature_inlet - heat_transfer*50; % Outlet temperature calculation pressure_outlet = pressure_inlet + heat_transfer*2; % Outlet pressure calculation

% Plot results

figure; subplot(2,1,1); plot(time, temperature_inlet, 'b', time, temperature_outlet, 'r'); xlabel('Time'); ylabel('Temperature (C)'); legend('Inlet Temperature', 'Outlet Temperature'); title('Temperature Variation in HRSG');

subplot(2,1,2);

plot(time, pressure_inlet, 'b', time, pressure_outlet, 'r'); xlabel('Time'); ylabel('Pressure (bar)'); legend('Inlet Pressure', 'Outlet Pressure'); title('Pressure Variation in HRSG');

Please see attached code along with plots.

Here are some links to aid you further in your research.

https://www.researchgate.net/publication/239786907_Modelling_and_long-term_simulation_of_a_heat_recovery_steam_generator

https://www.sciencedirect.com/science/article/pii/S2090447918300558

So, following these steps and guidelines should help you get started with your project. If you thoroughly review the links, experiment with above mentioned models, you will be able to create robust HRSG model for simulation purposes which is one of yours objective for Final Year Project (FYP).

Good luck!

[NG]

thanks for the guideline !

[Umar]

No problem, NG.

[NG]

Hi, I kinda lost on this part:

Heat Exchanger Block

For more information on heat exchanger block, please refer to

https://www.mathworks.com/help/autoblks/ref/heatexchanger.html?searchHighlight=Heat%20Exchanger%20block%20&s_tid=srchtitle_support_results_2_Heat%20Exchanger%20block%20

Connection:Connect the output of the Controlled Heat Flow Rate Source block to the input of the Heat Exchanger Block to simulate the heat exchange process.

It doesnt seem to connect properly, is it other types of Heat Exchanger that you indicate from above answer?

[Umar]

Hi NG,

My goal was to share basic concept of Heat Recovery Steam Generator (HRSG) application and the purpose of components. However, to be more specific, I will choose the Thermal Liquid - Gas heat exchanger. For more information on this block

https://www.mathworks.com/help/hydro/ref/heatexchangergtl.html

But you can figure out the rest because if you don’t try and learn on your own, then you will not be able to understand the main basic concept which is converting waste heat into usable energy make them indispensable in modern mechanical engineering systems. Please don’t take it the wrong way, the more efforts you put in and do more experiments by learning from it, the closer you will get to your goal.

[NG]

I understand, thanks for your leniency and help.

[Umar]

Hi NG,

Here is example of Rankine Cycle (Steam Turbine).

https://www.mathworks.com/help/simscape/ug/rankine-cycle-steam-turbine.html

As you probably familiar with the concept of utilizing the waste heat from a gas turbine or other process to generate steam for additional power production, HRSGs effectively increase the overall efficiency of a power plant. This aligns with the fundamental principle of the Rankine Cycle, which aims to extract as much work as possible from the heat input.

Also, using the S-Function block allows you to define custom behavior using MATLAB code. By writing MATLAB functions within the S-Function block, you can implement the desired functionality that is not available in standard Simulink blocks. This approach gives you the flexibility to tailor the block to your specific needs, making it a powerful tool for customizing simulations. For more information on S-block function, please refer to https://www.mathworks.com/help/simulink/sfg/what-is-an-s-function.html

I am sharing these guidelines to help you out, share the good news by saying hey Umar, I finally figured it out and got it working with all the hardwork and experimenting. I am confident that you will be able to simulate Heat Recovery Steam Generator and this project will speak for itself. Again, wishing you good luck for your future endeavors and please share the good news, once you get it working since now I am curious about it.