Coking furnace feed control valve
Thread Content
Currently, two out of the four feed control valves for the coking heating furnaces used in our plant are malfunctioning, so we are using bypass lines for regulation. The control valves here start to leak after 1 to 2 months of use. I was wondering if any of you experts have encountered this problem? What type of valve have you chosen? What metal material is it made of? And what is the service life?
Coking has occurred at the control valve; the upstream manual valve can be closed to maintain control, and it should be addressed during maintenance.
The material of the valve is determined according to the requirements of the design institute; however, it should be resistant to coking steam, as coking generally does not occur
Your radiation pump doesn’t have variable frequency, right? The voltage drop will go down once the frequency is changed.
No frequency conversion! The control valve is equipped with anti-coking steam. . . I have never seen this type of control valve; could you send me some information on it?
What is the specific problem with the control valve? Is the flow rate inaccurate or unadjustable?
This is mainly caused by a high pressure difference before and after the control valve; the common material used is alloy steel. To resolve this issue, 1. replace the valve head and seat. It’s only a temporary solution. 2. Find a way to reduce the pressure before the valve.
Processed catalytic slurry, right? Hehe, the solid content must be carefully controlled; it can’t be processed right away, otherwise there will be severe grinding! If there’s no frequency change, just turn off the radiation pump. It’s just that ordinary people are too afraid to take responsibility, haha.
Our old installation also encountered such problems: with two furnaces and four feed lines, one of those lines had to be regulated using a control valve bypass, which was very inconvenient. The new installation uses eccentric rotary valves, but we haven’t used them yet; we’re not sure about their performance and are waiting to see...
Eccentric rotation is even less useful! ! !
It is mainly caused by coked debris; during major overhauls, it is essential to clean the coke out of the fractionation towers and pipelines
The pressure design of conventional radiation pumps is usually on the high side; it involves a cutting impeller. Low pressure is also safe! It is also energy-efficient. We cut all three of ours.
Our unit is equipped with an eccentric rotating control valve, and it’s from Fisher. It really isn’t effective; the main issue is the delay in adjustment, as it can’t make adjustments in a timely manner.
We have encountered similar situations as well; it is recommended to use a variable-frequency drive with the radiation pump, as this yields better results and saves energy.
I’m boosting my own post, and I still haven’t gotten a good response! Maintenance is coming up soon – it’s a big challenge; I’m hoping experts can help solve this problem. It’s best to use methods that already have practical experience behind them. Last edited by Canghai Yizhibi on 2009-4-25 at 14:10.]
Hehe, maybe the technician didn’t look closely and thought it was the first valve of the feed system!