How to achieve proper ventilation in a 750-square-meter chemical processing workshop
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How to achieve proper ventilation in a 750-square-meter chemical processing workshop
Generally, exhaust fans are installed on the roof; companies that handle such installations have standards based on the size and layout of the factory building
The workshop is 20M long, 36 wide, and 7 high. Moreover, the density of harmful gases is greater than that of air. It is mainly deposited below.
That way, it’s possible to drill holes in the four walls and install exhaust fans; the height would be just a few dozen centimeters above the ground. In my company’s plant for methanol synthesis, there are such devices on both the walls and the roof
Mm-hm. So, given the size of our workshop, what power should the wall-mounted fans have?
I’m not quite sure about this; it’s better to ask the engineering department
For 3kW axial flow fans, 10-20 units are sufficient; they should be installed at a height of 200-300 above the ground
In such large-scale workshop spaces, a certain number of fans are installed on the side walls, while exhaust fans are installed at the ceiling.
We have a similar workshop, and the regulations require environmental ventilation as well as emergency exhaust ventilation. Environmental ventilation is needed 6 times per hour, while emergency exhaust ventilation is required 12 times per hour. Environmental ventilation is simple – there are just a few fans on the walls, and the air flow volume is sufficient for 6 air changes per hour. Emergency exhaust ventilation is intended to capture all the gases in the workshop and send them to an absorption tower for treatment in case of a leak; however, such a high level of air flow results in high costs, and our design provides less than 12 air changes per hour
What are toxic substances? Selection of fan capacity: Calculate the dilution air volume based on the occupational exposure limit for the toxic substance; then check whether there are any specified requirements regarding the number of ventilation cycles required for that substance. Choose the value that is higher between the dilution air volume and the air volume corresponding to the number of ventilation cycles. There are also design standards for other pipe dimensions, so it is recommended to consult with the designers