hydrogen plant deaerator
hydrogen plant deaerator
(OP)
hi all,
this question concerns the hydrogen plant deaerator.
whenever we take the process condensate in the deaerator of our unit the conductivity goes very high i.e. 5-6.with only dmin water coming to the deaerator it is about 2.
and though all other parameters are within limits this we have not been able to control.we increased the blow down rate to its' maximum but did'nt help.
and one more thing ,we have hydrazine and morpholine dosing for oxygen scavenging and ph control in our deaerator.
what is the preferred location for the dosing of these chemicals?
currently we are dosing morpholine in the deaerator vessel and hydrazine in the bfw pump suction i.e. vessel outlet.
santosh
this question concerns the hydrogen plant deaerator.
whenever we take the process condensate in the deaerator of our unit the conductivity goes very high i.e. 5-6.with only dmin water coming to the deaerator it is about 2.
and though all other parameters are within limits this we have not been able to control.we increased the blow down rate to its' maximum but did'nt help.
and one more thing ,we have hydrazine and morpholine dosing for oxygen scavenging and ph control in our deaerator.
what is the preferred location for the dosing of these chemicals?
currently we are dosing morpholine in the deaerator vessel and hydrazine in the bfw pump suction i.e. vessel outlet.
santosh





RE: hydrogen plant deaerator
RMW
RE: hydrogen plant deaerator
just below the packings lp steam connetion for deaeration has been provided which remains always on due known reasons.
santosh
RE: hydrogen plant deaerator
Some deaerators are designed with the thought in mind that condensate will return at an elevated temperature such that the condensate will release flash steam upon its entry into the deaerator vesses, thereby contributing to the deaerating steam, so it is brought in below the trays, sprays, packings, etc, so that the steam can move counter flow to the water flow.
Condensate at a temperature sufficient to provide flash steam to the deaeration process is hot enough that its oxygen soluability is as low as the deaerator is going to get it anyway.
Since your condensate is entering at atmospheric temperature, this tells me that its oxygen soluability is high, and it must be treated like make up water, and go through the complete deaeration process.
It is unclear to me how you get from two packed beds with steam provided for deaeration to entering the deaerator at ambient temperature. Is the condensate stored after it is deaerated?? Or, is the deaerating steam supply to the packed beds woefully inadequate??
RE: hydrogen plant deaerator
in this deaerator we have two packed bed sections ,one for the dmin water which comes at a temp of about 95-100 deg c.
another packed bed section is there which is independently for the process condensate .the process condensate enters at the top of this packed bed section.
we have steam injection into the deaerator at two points.one is direactly into vessel hold up water entering near the bottom and another near the top of the vessel below the process condensate stripper .both the steam are fully open.we maintain the pressure inside the deaerator at about 1.2 to 1.3 kg/cm2 by injecting steam(LP steam 3-4 kg/cm2).
santosh
RE: hydrogen plant deaerator
santosh