I want to design a gas washing and cooling tower
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I would like to design a gas washing and cooling tower; I would be extremely grateful if you could recommend some relevant information. How to determine the equipment size for this type of direct contact?
Describe it more clearly, including the specific operating conditions
There are many suppliers for this product on the market; if it is designed to operate under pressure, special qualifications are required. Judging from the topic of the question, if it involves design, one might need to learn from scratch*. For reference.
We produce hydrogen through alkaline electrolysis of water. The hydrogen produced contains saturated water vapor as well as some KOH. A water washing and cooling tower has been designed: its purpose is, first, to remove this small amount of KOH, and second, to cool the hydrogen. The temperature of the hydrogen is 85°C; by cooling it to 50°C, some condensate water will form. Since hydrogen is poorly soluble, when considering direct contact heat exchange, the previous washing tower comes to mind. Currently, the hydrogen pressure is 130 kPa (absolute), and the volume flow rate is 1800 m³/h. The final hydrogen production capacity will be 1000 Nm³/h
For details, see above. I’m trying to find a design approach; I really need to learn * from scratch, but I can’t find any relevant materials
The books “Principles of Chemical Engineering” and “Chemical Engineering Machinery” might be helpful to you. When the gas pressure is low and the flow rate is small, the temperature rises after heat exchange with the cooling water, and moisture will also be present in the hydrogen. It is also necessary to consider the impact of pressurized hydrogen transportation on the pressure equipment; it is best to take all factors into account for reference.
This post contains some relevant information; it involves the use of a large amount of circulating water for spraying, similar to a spray tower. A plate heat exchanger is installed at the pump outlet to cool the water using circulating water, and the cooled water is then sprayed back down from the top of the tower. https://bbs.hcbbs.com/thread-578647-1-1.html
Yes, it’s our company’s first time doing this as well. My idea is to use a large amount of water for spraying, then exchange heat with it before spraying it back again
Typically, the flow velocity in an empty tower is maintained at 1.5–2.0 m/s. For these smaller-scale units, a diameter of 800 mm can be achieved taking maintenance into account; there are no major issues with either the empty tower or the packing. What’s important is to ensure an adequate supply of circulating water, as well as multiple layers of spray nozzles. Additionally, it’s necessary to address the problem of steam and water entrainment at the rear end; if possible, a coalescing mesh should be used to prevent these substances from reaching the subsequent systems.
Even with washing, doesn’t the gas still contain saturated vapor? An air cooler can be used to lower the temperature along with condensed water