Condensers cogeneration system

Most of the turbines you will encounter in your work are called topping, or extraction, turbines. The idea of such a turbine is to extract much of the potential work from the motive steam, and then use the exhaust steam to reboil towers. Typically, the energy content of the exhaust steam is only 10 to 20 percent less than that of the motive steam. That is the calculation we just did with the Mollier diagram. The rest of the energy of the steam may then be used as the steam condensers, to reboil towers. This sounds pretty efficient. It is the basis for the new cogeneration projects you may have heard about. Of course, this system was used by the British Navy in the nineteenth century. 

Steam is used in the largest quantities in the evaporation of caustic and, sometimes, brine. A system for the collection and reuse of steam condensate goes hand-in-hand with steam supply. In this chapter, we also consider the use of steam as a source of mechanical power. This is of growing importance as more of the industry adopts cogeneration. 

You may ask What is the steam system configuration that can achieve the best cogeneration efficiency for a given process steam and power demands In the previous discussions, we know that the maximum cogeneration features maximal back-pressure power generation and minimal condensing. To achieve this, let us define the ideal R ratio, which is expressed as... 

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