How should 8 filters be combined and controlled in a reasonable way? Urgent! Urgent! Urgent! ! !
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There are currently 8 sand filters with a diameter of 4 meters, capable of handling 10,000 cubic meters of water per day. Now we need to decide whether to use one main pipe for feeding water to the sand filters and another main pipe for backwashing, or whether it would be better to set them up in groups (using multiple pumps and multiple pipes to supply water to the sand filters) The main considerations are that the flow rate in each sand filter tank should be the same, although there may be differences in pressure drop; it’s necessary to be able to determine which tank needs backwashing and to know how to control them in a coordinated manner Thank you!
Oh, right, the 8 sand filters operate in parallel
One pump uses less power; add flow control valves to each of the other branches……
This exam is about piping; 10,000 divided by 24 is approximately equal to 420 m3/h. What the questioner means is that backwashing should be carried out when there is a large pressure drop, that is, when filtering becomes difficult and resistance is high – in other words, cleaning at such times? Choose two pumps with a capacity of 300 cubic meters each, plus one spare pump; operate two pumps while keeping one as a backup. The normal flow rate is 430 cubic meters. There is one main pipe, to which 8 sand filters are connected in parallel. For a flow rate of 150–170 cubic meters, the 8 sand filters are used in rotation for backwashing, and the backwashing process also takes place via the main pipe. Does this work for you?
This post was last edited by *nht1 on 2015-9-14 19:19. Of course, pressure gauges are installed on each parallel branch, as well as flow control valves.
Sir, are control valves and flow meters installed in each parallel branch pipe?
So how can we ensure that the flow rates are equal? Also, the pressure differences will vary, which allows us to determine which one needs backwashing?
Can a control valve be used? Can the pressure difference be measured? Can it be determined that backwashing is necessary when the pressure drop and resistance are high?
Does that mean that, while ensuring the same flow rate in each sand filter tank, the pressure differences across those tanks are different?
If the solid-phase particles are evenly dispersed, the pressure difference should be the same; however, it might change if cleaning is carried out continuously over time
I would like to ask the experts: if a orifice plate is used to increase the resistance in the water distribution, just as in the case of high-resistance water distribution, can it ensure that the flow rates in each sand filter tank remain roughly consistent? Is this method feasible? The control valve can be omitted