Re: Direct Injection of Steam

Direct injection into a flowing liquid, usually water, or water-based, is commonly done in the food and steel industries. It's not just a matter of injecting the steam into the pipe - usually, the mixing is done in an ejector device, or in a special steam injector that has multiple small injection points spread along the length. Another device is a steam/water mixing valve. Penberthy, Spirax-Sarco, Pick and a number of other companies sell such equipment.
The steam and fluid pressure balance is critical to proper operation, and you need check valves in both inlet lines to prevent back-up of liquid into steam or vice-versa. You also have to protect the downstream from over-temperature or over-pressure in case of mal-function. And, of course, it dilutes the process liquid.

Neil Stone

At 02:37 PM 11/25/2001 +0400, you wrote:
>Dear Forum Members
>
>I am familiar with the design of direct injection of steam in an open tank,
>however, I wish to find out if anyone has had any success in steam injection
>into a pipe that has a liquid flowing. (In order to heat up the liquid)
>Is it safe? Is it practised anywhere? What are the pitfalls?
>
>Ahmed Vawda
>Process Engineer
>Al Khaleej Sugar - Dubai
>
>
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Received on Mon Nov 26 07:43:00 2001