Name: Heat Recovery Steam Generator (HRSG) Explained
Uploaded: 2024-12-18T10:09:39.000Z
Duration: 4 min 42 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

In this video, we'll take a look at a HRSIG, I'll show you all of its main parts, how it works, we'll discuss the different designs that are available to us, and I'll show you how it's used within a combined cycle power plant.

As with all SAVRI videos, I tend to take a top-down approach.

We'll look at the HRSIG from 10,000 feet, and then we'll zoom in and look at it in more detail as we drill down to the component level.

What we're looking at now is a combined cycle power plant.

You can see that there are two HRSIGs, that's these weird-shaped items over here.

They're quite narrow at the one end, narrow on the right, and then wider on the left.

That's a good way to identify the HRSIGs from a distance or whenever you're walking around the plant.

The gas turbines are within these gray boxes, and each gas turbine has an electrical generator enclosed within this cream box, and each one of those generators has an electrical transformer.

We have a separate video concerning combined cycle power plants, so I'm not going to go into great detail concerning how they work, although I will give you just a quick overview.

Each gas turbine acts as an electrical generator and also a heat source.

We're going to use fuel, which is chemical energy.

That causes our gas turbine rotor to rotate.

We rotate the generator rotor within this beige-colored box, and as a result, we generate electricity.

The gas turbines, though, will discharge a lot of hot gases, typically at a temperature of around 500 or 550 degrees Celsius.

In the past, people took those waste gases and all of the heat energy they contain, and they discharged them directly through a stack, like this one here, and all of that potential heat energy that we could have harnessed or recovered was lost.

Nowadays, that is not commercially viable.

It's too expensive just to waste that large amount of heat, so we're going to need to recover it.

The best way to recover the heat energy is by allowing it to flow across water tubes and transferring the heat energy to the water in order to generate steam.

It recovers heat in order to generate steam.

In this particular example, in our combined cycle power plant example, the gas turbines are the heat source, but this might not always be the case.

Some industrial processes generate a lot of heat, for example, a smelter.

It's not possible for a smelter to use all of the heat that it generates, so they'll try to recover that heat and use it internally, perhaps for different processes, but if that can't occur, then they'll try to sell the heat to a neighboring industrial plant or to any other consumer that wants to have it.

A good example would be a brewery, although there are many other examples as well.

The heat recovered can be used to heat buildings, heat factories, heat hot water, generate steam, which can then be used in many other industrial processes.

This is why when you have a facility that generates a lot of heat, you'll often see that other companies move to the area and they'll build an industrial plant directly neighboring the plant that generates all the heat, and they'll do this so that they can then purchase this heat at a much lower cost compared to if they produced the heat themselves.

This way, it works out to be quite cost-effective for both plants, both the seller and the buyer.

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