2 replies to this topic

[Dorota86]

Hi,

 

Can anyone help me with lime system seizing? Its pretreatrment water plant

 

Plant flow 1000 ML/d = 41667 m3/h

prelime dosage =4 mg/l 

post lime dosage = 13 mg/l

concentration 90%

density= 0.4 t/m3

my calcs: flow * dosage (pre+post) = 20777 kg/day = 50m3/d =20 t/d *30 = 600 t/month

 

we wanna have around 20 m high silo, so i choose 24 m heigh which gives me volume 500 m3 and has 200 t capacity *3 = 600 so i have 3 silos.

That is fine.

 

but next, dry lime going through rotary valve to hopper how big hopper shoulb be knowing that filling should take maybe 30 minutes and storage 4h and at what speed dry lime should leave the silo? i need have some assumptions because i dont have this data

 

and then from hopper lime is going to lime slurry tank where i want to have concentration 5% and 10 minuts detention time 

volume of tank would be then : 10 min * flow = 0.166h*41667=7000m3

but how much water and lime i am adding like 5kg lime and 95 kg of water? thats gives me 5%

 

just easy estimation calcs nothing really demanding, however i cant find any example in any book nor websites

will appreciate any help

thank you

 

[breizh]

Hi Dorota,

Check for Lime slaking using your favorite search engine:

https://www.sttsyste...per_1-27-22.pdf

 

https://www.bulkhand...ologies.com.au/

 

Breizh 

[breizh]

Hi,

Consider studying the document attached,

Good luck

Breizh