Gas scrubbing plants for process and environ – mental technology. We specialize in
jet and Venturi scrubbers which are used with a high success rate in the field of
process and environmental technology for cleaning and de-dusting discharge air,
absorbing noxious gaseous substances, separating aerosols and cooling gases.
We offer a series of standard scrubber types, which can also be combined depending
on the application: Jet scrubbers types I and II Hot gas scrubbers (Quench) / flue
gas scrubbers Packing towers Venturi scrubbers Capacity ranges from 0.05 m3 /h up to
approx. 100,000 m3 /h gas throughput with exhaust gas temperatures of up to 1,300
°C.
Jet scrubbers are particularly suitable for use with ex – plosive gas mixtures and
heavily dust-laden and highly corrosive gases. They can also be conveniently
installed into existing plants at a later date.
The quench head is positioned directly in front of the jet scrubber. The hot
discharge gas is cooled down to substantially lower temperatures than 100 ºC by
spraying in scrubbing liquid before the noxious substances are absorbed in the jet
scrubber and rough separation of the dust possibly takes place.
The gas and the liquid phase are separated in the centrifugal separator which is
arranged downstream. Tower packing, which guarantees the cleaning of exhaust gases
down to emission limits, is usually incorporated in the separator. A droplet
separator prevents the entrainment of scrubbing liquid.
The plants are designed to reduce halogen and halogen hydrogen and sulphur
compositions down to the required exhaust gas limits. In the process a light
alkaline scrubbing solvent is circulated. If the hydrochloric acid concentrations in
the flue gas are very high, the plant can also be designed to include HCl recovery.
These plants can also be easily extended with Venturi scrubbers for fine dust or
aerosol separation, catalytic plants for the removal of nitrogen and active carbon
adsorbers for the separation of heavy metals.
Additional packing or trays are installed into the scrubber’s separator as
counter-flow columns for fine cleaning. Depending on the particular application, jet
scrubbers can also be designed with several effects or combined with Venturi
scrubbers or aerosol separators.
Pure water, diluted acids or caustic solutions are used as scrubbing medium. As a
result, the scrubbers are very well suited to the absorption of halogens (F2 , Cl2 ,
Br2 , J2 ), halogen-hydrogen (HF, HCl, HBr, HJ), sulphur compo – sitions (SO2 , SO3
, H2S), ammonia (NH3) together with low molecular alcohols, carbon acids and
amines).
If the exhaust gas contains a sufficient concentration of only one noxious
substance, there is the possibility of recovering this from the exhaust gas:
Hydrochloric acid recovery Production of ammonia solution Production of sodium
hydrogen sulphite Production of chlorine bleaching Depending on the strength of the
chemicals, the plants can be supplied in metallic material, coated steel, thermo –
plast or fibre-glass reinforced plastic.
Highlights
Flue-gas desulfurization(FGD) is a set of technologies used to remove sulfur dioxide
(SO from exhaust flue gases of fossil-fuel power plants, and from the emissions of
other sulfur oxide emitting processes such as waste incineration.
Packed-bed scrubbers consist of a chamber containing layers of variously shaped
packing material, such as Pall rings, Raschig rings or Berl saddles that provide a
large surface area for liquid-gas contact. The packing is held in place by wire mesh
retainers and supported by a plate near the bottom of the scrubber. Scrubbing liquid
is evenly introduced above the packing and flows down through the bed. The liquid
coats the packing and establishes a thin film. The pollutant to be absorbed must be
soluble in the fluid. In vertical packed bed scrubber, the gas stream flows up the
chamber (countercurrent to the liquid).
Physical absorption depends on properties of the gas stream and liquid solvent, such
as density and viscosity, as well as specific characteristics of the pollutants in
the gas (e.g., diffusivity, equilibrium solubility). These properties are
temperature dependent, and lower temperatures generally favor absorption of gases by
the solvent.
Types of Technology
Drizgas Tech is leading Wet Scrubber manufacturers in Indiafor Boiler flue gas. We
design and manufacture wet scrubber to suit the customer’s requirement.
Wet Scrubbers are the pollution control devicesusually installed in the path of the
flue gases to extract Sulfur compounds or oxides of sulfur such as Sulfur Dioxide
(SO2) and Ash particles. Wet Scrubbers are called so because of the scrubbing action
of gases in contact with water to scrub off dirty particulates or gases that cause
air pollution.
The general composition of a fuel is a mixture of Carbon (C), Hydrogen (H), Sulfur
(S), Oxygen (O), Nitrogen (N) and other elements. Combustion of fuel with air
generates flue gases that contain Sulfur Dioxide (SO2), Carbon Dioxide (CO2), Ash,
Water vapor (H2O).
Features
Can handle air flow rate from 100 to 100,000 CFM
Removal method is Absorption / Chemisorption
Material of Construction: PP, FRP, PP+FRP, MS+FRP, SS 304, SS 316
High efficiency Tellerette®Tower Packing removes soluble/reactive
gases, solid particulate and liquid droplets down to 7 microns
Lower shell serves as integral sump for recycle of liquid
Spray nozzles accessible from top of unit
Entrainment separators prevent liquid carryover
Special multi-bed packing designs accommodate different scrubbing
solutions for removal of multiple contaminants
Efficiency up to 99 %
Design considerations
Air flow rate of exhaust gas
Velocity across the column
Pollutant concentration in the gas
Solubility of pollutants in solvent/water
Reaction rate
Liquid to Gas (L/G) ratio
HTU (Height of Transfer Unit)
Packing material size, shape and type
Packing depth
Gas temperature
Advantages of Boiler Wet scrubber
Reduces pollutionand follow the compliance
of the Pollution Control Board.
Easy operation so trained operator is not required.
Additional accessories
Continuous pH monitoring system for scrubbing liquid
Dosing system for adjusting pH
PLC operated control panel
SCADA system
Phone Number
+91 842 823 1593 | +91 995 287 7991
Email Address
sales@drizgas.com | info@drizgas.com
Office Address
No. 50, Villianur Main Road, Odiyampet, Puducherry - 605 110, INDIA