Ejectors Barometric condenser

Steam ejector system, multistage with barometric condensers, 0.07-27 kPa-abs, steam pressure 0.7 MPa, and 29 °C water including two ejectors, barometric condenser and interstage piping. FOB cost = 28 500 at the ratio of the gas capacity (kg/h)/the absolute pressure (kPa) = 10 with n = 0.24 for the range 0.8-80. L-rM ... 

Vacuum Distillation - Heavier fractions from the atmospheric distillation unit that cannot be distilled without cracking under its pressure and temperature conditions are vacuum distilled. Vacuum distillation is simply the distillation of petroleum fractions at a very low pressure (0.2 to 0.7 psia) to increase volatilization and separation. In most systems, the vacuum inside the fractionator is maintained with steam ejectors and vacuum pumps, barometric condensers, or surface condensers. 

Example 6-12 Temperatures at Barometric Condenser on Ejector System... 

Installation arrangements, 351 Pump-down time, 380 Selection procedure, 374 Specification form, 377 Specifications, 373 Steam jet comparison, 356 Types of loads, 359 Ejectors, 346 Applications, 353 Barometric condenser, 249, 376 Booster, 370 Calculations Actual air capacity, 362 Air equivalent, 360... 

The vapors leaving the primary barometric condenser proceed to a steam ejector that is followed by another barometric. Pressures at the tops of the towers are maintained at 50mmHg absolute. Pressure drop is 2mmHg per tray. Bottom temperatures of the three towers are 450, 500, and 540°F, respectively. Tower overhead temperatures are 200°F. Pitch and roan go to storage at 350°F and the other products at 125°F. The steam generated in the pitch and rosin coolers is at 20 psig. Process steam is at 150 psig. 

Uncondensed vapors are removed at the top of the column with a one-stage steam jet ejector equipped with a barometric condenser. 

Figure 7.30. Arrangements of two-stage ejectors with condensers, (a) Identification of the parts of a two-stage ejector (Croll-Reynolds Co.). (b) A two-stage ejector with interstage barometric condenser (Elliot Co.), (c) A two-stage ejector with surface condensers interstage and terminal (Elliot Co.).

A way to reduce motive steam consumption in a steam-ejector system with barometric condensers is to lower the temperature of the water recirculating in the... 

Figure 16. Vacuum steam ejector system with barometric condensers used in edible oil deodorization (Kdrting).

TABLE 18. Effect of Barometric Condenser Water Temperature on Motive Steam Consumption in Steam Ejector System. 

---