Tower condensation

Figure 4.21 Direct, dry-type cooling tower condensing system utilizing a mechanical-draft tower.

Economic Aspects of Various (Cooling Tower) Condensation Processes Blanck, D. 

Chemical and processing towers, condensers. Furnace parts such as retorts and low stressed parts subject to temperatures up to 800 "C. Type 430 nitric-acid storage tanks, furnace parts, fan scrolls. Type 430F-pump shafts, instrument parts, valve parts Products requiring high yield point and resistance to shock... 

Water dried, carbon dioxide and hydrogen sulphide free gas i.e. wet-gas, is chilled (typically to about -35°C) and enters the bottom of the absorber tower there are usually two absorber towers. Condensate separated in the chiller unit leaves the bottom of the tower, the gas rises against a chilled falling solvent that has entered the top of the tower (the lean-oil). The solvent absorbs the heavier constituents while the lighter sales gas rises to the top of the absorber and exits the top of the tower. The now rich-oil is collected on an absorber tray above the gas entry point and passes via heat exchangers to a column (ROD). 

In cold weather, water vapor exhausted from cooling towers condenses and fog is formed as a plume. What are one or two economically practical methods of preventing such cooling tower fog ... 

Cooling tower Condenser makeup Coal (subcritical) Cooling tower Condenser makeup FGD makeup... 

Process simulation software typically will produce a flowsheet, but this is probably not a true process flow diagram and should not be used as one in a report. There are two reasons for this. First, the simulator-produced flowsheet is unlikely to follow all the conventions of PFDs given in Chapter 1 regarding equipment symbols, line crosses, labels, and so on. Second, the process simulated is not the true process. One unit in the process simulator (such as a distillation column) maybe several pieces of equipment (tower, condenser, condensate tank, etc.) that need to be shown on a PFD. It is common to simulate a sin e unit (such as a process-process heat exchanger) as two units to decouple the recycle calculations. Some units, such as a storage tank, require no calculations in the process simulator and thus are not shown on its flowsheet. However, the simulator flowsheet is essential in the appendix of the report if the simulator report is included. Care should be taken to use the same stream numbers in the simulation flowsheet as in the PFD whenever possible. 

Air pollution control methods to reduce particulate and fume emissions include bag filters, venturi scrubbers, packed tower condensation, multiple cyclones, and water wash filters. The collected incinerator fly ash and wash water may include hazardous materials that must be processed out of this waste or buried in a controlled landflll. 

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