HCL SCRUBBER

Hcl gas is colorless, pervasive and corrosive, mostly emitted from process reactors, Hcl storage tanks while filling and laboratory.  Hcl gas emits easily from aqueous solution of concentrated hcl at atmospheric temperature and diluted hcl at higher temperature. The high vapour pressure of hcl tends to emit the fumes.

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Description

Hcl Scrubber works on principle of absorption technology. A column in which gas is passed at bottom and liquid is sprayed at opposite direction. Packing material is filled to bring the intimate contact between gas and liquid. There are two things happening here, providing cooling for exhaust gas and removing hcl gas from exhaust.

  • Liquid to Gas (L/G) ratio: Liquid required to cover / wet gas passed through the column. It is determined based on pollutants solubility in (Henry’s law) and solvent.
  • Flooding: If the liquid is not sprayed equally in the column, the will pass in one side of the column, this leads to inefficiency of scrubbing. Normally, 60 – 80 % of flooding will be considered as optimum design.
  • Selection of packing material: Generally packing material helps to increase the surface area for mass transfer between gas and liquid. This surface area / mass transfer area varies based on the size, shape and material of construction. Smaller the size, higher the efficiency and higher the pressure drop, and vice versa. Improper selection of packing leads to the higher power consumption and fouling in operation, scale formation etc.
  • Solvent selection: Normally, water is used to scrub the hcl fumes if the concentration is high, greater than 3000 ppm. This forms the diluted hcl solution, and it can be reused. However, it does not work for lower concentration. NaOH will be used as solvent to increase the absorption efficiency and to scrub continuously.
AIR HANDLING VOLUME100 CFM to 25000 CFM
TYPEWET TYPE PACKED BED
SYSTEM PRESSURE DROP75 mm W.C
REMOVAL EFFICIENCYABOVE 99.9 %
MOCPP / FRP / PP+FRP / HDPE / SS / MS+Epoxy
PACKING MATERIAL1” PP/Ceramic pall rings
2’’ PP/Ceramic pall rings
HEIGHT OF TRANSFER UNIT (EFFECTIVENESS OF PACKING)Lesser the HTU, higher the efficiency
HCL – NaOH : 210 mm
FLOODING80 %
NOZZLESNozzles of 1” size – PP/SS nozzles
STRUCTURERIGID SUB BASE
CONTROL SYSTEMRECIRCULATION SUMP LEVEL CONTROL SYSTEM
ACCESSORIESPACKING REMOVAL AND FILL-UP ACCESS
CLEANOUT PORTS
PACKING SUPPORT GRID
Y-STRAINER
SAFETY ACCESSORIES– DRAIN VALVE WITH BALL VALVE
– WATER INLET VALVE
– SOLENOID VALVE (Optional)
– OVERFLOW PROVISION
– WATER LEVEL INDICATOR
– INSPECTION GLASS PORT FOR PACKING AREA
Scrubbing liquidSulfuric acid solution
Blower– Direct drive
– High efficiency Blower
– Low Noise Blower

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