Re: ozone-generators (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 13 Apr 2004 15:18:51 -0700 (PDT)
From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: ozone-generators (fwd)

The ones I built use liquid oxygen, evaporated to
gasseous oxygen, and use corona discharge. Even though
we only pay $0.03/kWhr, it's still cheaper here to buy
the LOX, than to make it from air.

Quick story: I live near Atlanta, GA. Shortly after
starting up one of our first ozone generating
facilities, one of the ambient ozone monitor alarms
went off, which shut down the generators and
ventilated the control room. However, after shutting
down the generators and ventilating the control room,
the ambient ozone levels rose. It turned out the
outdoor ozone levels exceded the limits set for the
monitor (8 hour OSHA limits, I believe)!  The
operators, who had been worrying about working in an
ozone building, were actually safer indoors than they
would have been outdoors.

Adam

--- High Voltage list <hvlist@xxxxxxxxxx> wrote:
> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Tue, 13 Apr 2004 09:41:05 -0600
> From: Gomez Addams <gomez@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: ozone-generators (fwd)
>
> On Apr 13, 2004, at 8:48 AM, High Voltage list
> wrote:
>
> > Original poster: Steven Roys <sroys@xxxxxxxx>
> >
> >
> >
> > ---------- Forwarded message ----------
> > Date: Sun, 11 Apr 2004 20:38:42 -0700 (PDT)
> > From: Peter Lawrence <Peter.Lawrence@xxxxxxx>
> > To: hvlist@xxxxxxxxxx
> > Subject: ozone-generators
> >
> >
> > Does anyone know how ozone generators are
> designed/built. I'ld like to
> > DIY
> > since I've got several NSTs for building Tesla
> Coils, but I'm wondering
> > how the commercially available units avoid
> generating nitric oxides
> > (like
> > Tesla Coils do).
>
>   The more serious commercial units use an oxygen
> concentrator before
> the UV
> lamp or corona tube to reduce the amount of nitrogen
> entering the
> ionization
> section.  An air drier is also crucial, so that the
> (normally benign)
> oxides of nitrogen do not form nasty nitric acid,
> which is the real
> culprit
> associated with oxides of nitrogen.
>
> > Searching the web leads me to believe they
> typically use a high
> > frequency
> > inverter for HV, but its not clear whether this is
> just a low-cost way
> > of generating HV at very low current, or if high
> frequency is a part
> > of the
> > way to avoid generating the nitric-oxides.
>
>   Corona generators create two to five times higher
> ozone concentration
> than
> UV ionizers and are thus more economical.
>
>





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