PEM Balance of Plant Masterclass 2025 - (Part 2) Balance of Plant Basics скачать в хорошем качестве

PEM Balance of Plant Masterclass 2025 - (Part 2) Balance of Plant Basics

Website: hydrogentrainingsolutions.co.uk Contact: [email protected] The balance of plant basics. So balance of plant wise this, this is just a process flowchart. A very basic, as basic as you can get process flowchart for a 1 megawatt electrolyzer. So the numbers here are given for 1 megawatt of electrolysis. And you can you know, if you have 2 megawatts just multiply the numbers by 2, etc. So typically what we'll have is we'll have a water inlet into the water purification system. And this is going to be tap water. In the UK typically tap water is about 600 microsiemen per cm. And this tap water will go into the water purification system and there will be. And we'll go into how this works. For now it's just a bott. By the way we will go into the water purification system shortly. But at the moment all we need to know is out of this 325liters, about 125liters will be drained through the reverse osmosis system. And about 200 liters will go into the oxygen water separation vessel. And this is going to be used as process water for the for the PEM electrolyzer stack. So the water coming in like we said is going to be about 600 micro Siemens per centimeter depending on where in the world you are. And it could be less, it could be more. And the water going into the oxygen water separation vessel. So the water coming out of the water purification system, what you're looking for is okay, let's say around 0.1, 0.2 micro Siemens per centimeter. But we'll go into that shortly as well. And then from here we've got the oxygen water separation vessel. Is going to be a tank filled with water and oxygen will be on the top. And what we do here is we have a main circulation pump which pumps the water through the electrolyzer stack. So it pumps it in and the water comes out on the other side. And then later on it will go into the plate heat exchanger and the plate heat exchanger is going to is going to cool down our water. It will provide cooling. But the plate heat exchanger is going to be inside because we don't want the water to go outside because in the winter it's going to freeze. So we will have a different medium which is going to be some sort of a coolant with an inhibitor inside, which will go Outside the airblast cooler to provide the cooling. And what we also have is this purified water as we are electrolyzing. And by the way, when we're electrolyzing at relatively low current density, there'll be quite a lot of you know, certain impurities will be, will be released into into the water. And we must, we must purify that, we must take that out. Otherwise eventually, the conductivity will keep on peaking up and we'll get to a point where it's too high and we must stop the electrolysis because if we run the electrolyzer, with crappy water, then the stack will basically, and we'll go into how that works a little bit later. But essentially the stack will not have a very long life if we run the stack with terrible water. So what we do is we have a water repolishing pump and this, there'll be a water repolishing loop which will pump about 50 liters a minute back into here and there'll be an extra sort of you know, 50 liters per minute loop here, which by the way, the 50 liters per minute comes from.