Condensate recovery

Condensa.te Recovery Pumps. The condensate recovery pump is a unique design that utilizes a motive steam or an air supply to move condensate. It can be appHed to capacities up to 23,000 kg/h (50,000 lb /h), providing valuable recovery of condensate or other Hquids, which otherwise would be wasted. 

Our example system has a flow-controlled feed, and the reboiler heat is controlled by cascade from a stripping section tray temperature. Steam is the heating medium, with the condensate pumped to condensate recovery. Bottom product is pumped to storage on column level control overhead pressure is controlled by varying level in the overhead condenser the balancing line assures sufficient receiver pressure at all times overhead product is pumped to storage on receiver level control and reflux is on flow control. 

External to the boiler itself are various pre-boiler and post-boiler water subsystems. These include the MU water pretreatment system, FW supply system, and steam-condensate recovery system, again of varying complexity depending on the design and size of the boiler. 

The condensate return system is a post-boiler section system that includes all steam traps, condensate lines, associated manifolds and valves, condensate receiving tanks, save-all tanks, condensate pumps, and other auxiliaries for condensate recovery. 

Hydrogenation of the nitrobenzene Separation of the reactor products by condensation Recovery of crude aniline by distillation Purification of the crude nitrobenzene Recovery of aniline from waste water streams... 

In ammonium phosphate and mixed and blend fertilizer (G) production, another possibility is to design for a lower-pressure steam level (i.e., 42-62 atm) in the ammonia plant to make process condensate recovery easier and less costly. 

Plants with CR >70 percent are usually doing a good job of recovering condensate. CR values of <30 percent represent poor performance. Poor condensate recovery is expensive for two reasons. One reason is the energy and chemicals needed to prepare the boiler feedwater. But in recent years, there is a second, more expensive cost associated with poor condensate recovery effluent wastewater treatment. 

Production of heat energy at Rohm Haas has been improved by better control of combustion in boilers, cleaning and maintenance of boilers and process heaters to maintain their efficiency, elimination of steam leakages, steam trap maintenance, and improved condensate recovery (4). 

The boiler itself should be very efficient to generate steam and for this preparation of oil, air to fuel ratio, stack temperature of flue gases, conversion of furnace oil to LSHS oil, maximum condensate recovery, cleaning of the fire side, replacement of old boilers etc. are the various important factors to be taken care-of. Factors responsible for optimum consumption of steam such as supply of steam at correct pressure, provision of pressure reducing valves, water separators in steam lines for supply of dry steams at requisite pressure, selection of trap of right type and size for efficient recovery of condensate etc. should be considered for the saving of thermal energy. 

As an example, consider the calculation of concurrent absorption as applied to a gas-condensate field with low reservoir pressure and positive temperatures of gas at the entrance to the DCPG. Such thermobaric conditions make it possible to carry out intrapipe absorption even with such a low-efficient absorbent as weathered condensate. To increase the condensate recovery in the process of absorption, we can deliver the absorbent into gas flow in the pipeline before the separators at the gas gauging station. Before we start to calculate the absorption process, it is necessary to determine the composition of weathered condensate that gets collected after the first stage of separation. Denote by pB and Tb the pressure and temperature in the divider where the condensate weathering takes place. The composition of the condensate collected after the first step of separation, and also the composition of the reservoir gas are given in Table 20.3. 

Plant-wide steam network optimization repair passing steam traps improved steam condensate recovery, use better insulation... 

Reduce steam condensate draining by installing steam traps reduce flashing of steam condensate in condensate headers by condensate cooling separating flash steam install additional steam condensate recovery systems... 

Maximise condensate recovery from various points in the plant—specifically from steam turbine condenser and process units (in cogeneration plants). 

Monitoring performance of steam consuming units such as process reactors, multiple effect evaporators (measuring their steam consumption and condensate recovery)-,... 

Expected backpressure from condensate recovery pipeline if it is too long or in case the condensate is at high pressure—when being discharged—it can flash into live steam. This may be lost to the atmosphere. 

Hot inert gas desorption Desorption by means of an hot inert gas recirculation. Solvent recovery can be achieved with refrigerated condenser Recovery of partly or completely water soluble solvents. Recovery of reactive solvents (ketones) or solvents which react with hot steam (chlorinated hydrocarbons)... 

---