Question 5. What Are Some Good Uses Of Low-grade Steam At 12 Atm And 1920c?
Answer : There are various traditional methods to employ waste steam in an operating plant: You can generate electricity through a steam turbine-generator set. The electricity is usually put back in the line; this is the idea behind the "Co-Gen" concept used today in many USA plants. Steam turbines can effectively use saturated steam supply down to 75 - 100 psig. In special conditions, they have used down to 50 psig as a turbine steam supply. I have used steam as low as 100 psig. You can pre-heat process streams that require pre-heating; this is done by applying heat exchangers. You can employ the waste steam as a refrigeration source by employing it in vacuum jet ejectors and producing 50 of cooling water.
