Let’s take a look at how much exhaust gas is produced at the water discharge point above the oil-water separation tank ?
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Let’s take a look at how much exhaust gas is produced at the water discharge point above the oil-water separation tank ? The image shows an oil-water separator: the upper phase is toluene, while the lower phase is water. The exhaust outlet at the top has a diameter of DN25. The temperature of the oil-water separator is 40 degrees Celsius, and the external atmospheric pressure is 1 atmosphere. The exhaust pipe is connected to the inlet of the fan; the fan has a capacity of 1264 m3/h and a total pressure of 3597 Pa. At the fan’s inlet, there is a main exhaust pipe with a diameter of DN300, and the pressure loss across this pipe is around 2000 Pa. From there, another exhaust pipe leads to the oil-water separator, with a diameter of DN25. Questions: 1. What is the absolute pressure that can be generated above the exhaust pipe of the oil-water separator? How can this be calculated? 2. How is the amount of exhaust gas generated by the oil-water separator calculated (m3/h)? Is it calculated based on the pipe diameter DN25 and the wind speed in the vent pipe? 3. What are the components of the exhaust gas generated by the oil-water separator? What is the generation rate (kg/m3)? 4. If the diameter of the vent pipe is changed to DN50, how will the above 3 points change? ?
Ignoring the issue of the amounts of toluene and water in the oil-water separator, it is assumed that these amounts are sufficient
Too many questions are asked, and people usually don’t reply; it’s better to ask them one by one.
This needs to be calculated based on material balance.
This configuration is unreasonable in itself, and calculating the flow rate is pointless; the main concern here is the environmental issue of organic gas leakage, so it is sufficient to maintain a negative pressure in the separator. I have a patent for a fully automatic oil-water separator: it has inputs for water and outputs for water, as well as inputs for oil and outputs for oil – the same amount enters as exits. You can reach out to me if you need it.
Our gas is used to power the gas compressor
1. The pressure can be calculated based on the negative pressure at the fan’s inlet; this value can be found in the fan’s specifications or by consulting the manufacturer, and it is generally in the range of several dozen PA of negative pressure. 2. The maximum amount of waste gas generated is the evaporation amount of toluene at the pressure specified in the first question, while the minimum amount is the evaporation amount of the mixture (toluene and water). 3. The main components of the exhaust gas are toluene and water. 4. No change.
Is there no change in the fourth question? ? When the pipe diameter is different but the flow rate remains the same, the volume of gas will vary; moreover, the evaporation rate also differs depending on the pipe diameter, right? ?
The gas generation volume in your case is very small compared to the rated exhaust capacity of the fan; it is sufficient to consider the gas generation volume at specific temperature and pressure levels, as it has nothing to do with the pipe diameter.
There’s another issue: the flame arrester you’ve drawn is incorrect. Remove the cover on top; what’s needed here is a pipeline flame arrester, without that extra part on top