Condy quenching vessel sizing 1

[SL1000]

Hi
I wish to put the output of a condensate dumping system through a temperature controlled pit. The condensate return lines are from 4 heat exchangers and are used to make up feed water into boilers. There are conductivity sensors and dump valves on the output of each heat exchanger. These currently dump to ground causing terrible conditions for equipment in the immediate area as a result of the flashing off.

Can anyone help me with the process of calculating the required size of the quenching vessel (I plan to use sea water for this) and which parameters I need to investigate in order to do this. I think the steam usage is around 10 - 15tph temperature around 200deg C.

Thanks in advance.

 

[Dutch500]

Find volume of water being dumped,
Temperature of water at dump,
Desired tempeture of the return (to DFT or storage tank?),
Temperature of sea water used for cooling,
From these you wil know how much water you need to cool, and how much difference in temperature of sea water and dump water will tell you how much you can cool it.(Also, the volume of sea water it will take to reach the desired amount of heat transfer.)Difference between dump temperature and return will tell you how much cooling is needed.

Are all four exchangers on line at the same time? Can you install a cross connect that will allow you to use the separate exchangers as step downs? Instead of a pit, can you use the same size heat exchanger with the dump on a closed return, and use sea water in the second exchanger? Are you on a platform that would allow drill water to be used as your pit? Are there any aplications on site, that could use the heat you are trying to shed, (fuel heaters, hotel services), that a closed loop could be installed with minimum difficulty at a less expensive cost? Are you close enough to your sea water source to use an apparatus like a keel cooler, directly submersing it in the sea water? This may be easier than bringing the seawater to you, and may also eliminate the need for an additional pump. Is the dump under sufficient pressure to circulate back to the return without an additional pump?
If you do use seawater in a heat exchanger, be sure to allow for growth in the tubes. You are building a filter feeders paradise. Another noteworthy mention, if this is a critical system, build two and install crossover piping so that one can be online while the other is down for cleaning. By increasing the sea water temperature by as little as five degrees, you can double or triple the rate of marine growth inside the system. Rodding the tubes will be a regular, required, maintenance. Plan for it when you design your installation. Good luck,


Dutch500

 

[whylie]

SL1000,

Hi..Depending on your system configuration..you may use a local nearby condensate horizontal drum with good residence time and vapour recycle..or rearrange your steam traps..I suggest you look up (Armstrong Steam University)..veru helpful tips ..Also Spirax-Sarco..selection program,can help
Layout of your system is very crucial to the hydrodynamics

Goodluck

wahasan@yahoo.ca