The Brine Evaporation System is designed to concentrate a 32,000 lb/hr brine stream at 24% brine to 48% strength. This brine evaporator system provides organic separation steps prior to evaporation of the brine. This system was previously used by Procter & Gamble at their amines plant in the United States.
Alternative uses for the Brine Stripping System process include evaporation of water to concentrate a variety of salt stream or food processing. The metallurgy in this system makes it applicable to many different chemicals and should meet FDA requirements for food processing. It has the added benefit of the organic separation steps.
The Honeywell 3000 process control system and program are available with this process, as is all necessary documentation (equipment files, P&IDs, PFDs, operating manuals, etc.). All pressure vessels have National Board numbers, and spare parts are available for most equipment. There is no asbestos in the plant, and it has been properly cleaned of all chemicals. This site is very accessible by road and rail. Equipment can be barged from the local docks only a few miles away on a major river.
Brine Stripping Process Flow Diagram
Brine Settler (Stock #216039):
Brine feed to the settler is first cooled in an exchanger to promote separation of any organics. The large volume of this tank provides residence time for additional separation of “non-soluble”. The non-soluble organics have a lower specific gravity and tend to float to the top of the tank. Periodically the organic layer in the settler is floated into another storage tank for rework or disposal. The flow of brine from the bottom of the settler is controlled by a level controller on the settler. The pressure settler is a 23,700 gallon, 304SS vertical storage tank measuring 12' diameter x 36'7" overall height with welded dish heads. It is rated for 60 psig at 200°F with a 1/2" thick shell.
Stripping Column (Stock #216093 - listed separately as 600547):
Light organics can be removed using the stripping column. This particular application was removing di-methyl amine from a level of about 5% down to a level of less than 18 ppm. Brine feed to the stripper is preheated to approximately 235°F using an interchanger. The brine feed to the stripper enters at the top of the column as a liquid and flows down through the packing into the stripper pot.
At the same time, steam is introduced at the bottom of the stripper, just above the liquid level in the stripper pot. The steam travels up the column and vaporizes any light organics out of the brine solution. The steam and light organics exit the top of the stripper and pass through an entrainment separator used to knock-out entrained liquid (primarily brine) while allowing the steam and light organic vapors to pass through the stripper overheads condenser. This exchanger condenses the steam and light organics, which can be reworked or disposed. A level is maintained in the brine stripper pot to insure that the evaporator feed pump suction is flooded. The brine from the stripper is then pumped to the first effect of the evaporator.
The 297 cu. ft., 304SS stripper column is 30" diameter x 62' tall, and is rated for FV/180 psig at 400°F. The stripper condenser has 1,335 sq. ft. of surface area and 304SS tubes, heads, and shell. Both the stripper and the condenser were manufactured in 2000.
Evaporator System (Stock #216076):
The Evaporator System is designed to concentrate a 32,000 lb/hr brine stream at 24% brine to 48% strength. The brine evaporation system is a double-effect system to increase the amount of evaporation per pound of steam used. The first effect of the evaporator was installed in 2000 with the original plant startup. The second effect was designed by Swenson and was installed in 2005 as part of the capacity expansion project. The second effect system is all modular and can easily be dismantled and shipped by truck. This system is all 304LSS and 316LSS, and there is a spare tube bundle for the first effect.
The first effect evaporator can be sold separately as a batch evaporator (IPP stock #216077.) It is heated using 5,000 lbs/hr of 150 psig steam in the tube bundle. The vapor (steam) generated in the first effect is then used as the heat source for the second effect evaporator. In this manner, the heat in the original 150 psig steam is reused in the second effect reboiler (IPP Stock # 216082). The 32,000 lbs/hr of brine entering the first effect will normally be 20-25% NaBr. The first effect is designed to concentrate the brine to approximately 35% NaBr and operates at 310°F and 45 psig. A level controller maintains the level in the first effect high enough to cover the tubes of the first effect tube bundle. The second effect evaporator operates at atmospheric pressure and concentrates the NaBr from approximately 35% to a target of 45-50% NaBr. The overheads from the second effect pass through an overheads condensers (IPP Stock #216085) where the steam is condensed and sent to a condensate collection tank. The NaBr from the second effect gravity flows through a cooler and into a storage tank for certification. The brine is then loaded into trucks and sent back to the bromine supplier for recovery of the bromine.
This system can remove 16,000 lbs/hr of water. The first effect evaporator is 6’ diameter x 10” tall. It is constructed of 304SS and is rated for 150 psig at 375°F. There is a spare tube bundle available. The second effect evaporator is 3’ diameter x 20’ tall and is also constructed of 304SS. Peripheral equipment includes circulation heaters, overheads condenser, vacuum system, circulation pump, product transfer pump, condensate collection tank, condensate pump, salt transfer pump, and modular structure.
Vacuum System (Stock #216089):
The vacuum is provided by a Graham multi stage ejector package constructed out of 304SS and including the following: two stage ejector package with motive pressure of 125 psig and (3) 150 sq. ft. condensers rated for both shell and tubes at FV/150 psig at 400°F.
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