Atmospheric pollution scrubbers

The oleum boiler is also provided with a good pressure relief valve to release excess pressure if the rate of condensation is less due to any reason. The vapours are released through a scrubber irrigated with 98 % sulphuric acid to prevent atmospheric pollution. 

Unconverted SOj, SO3 (mainly as sulphuric acid mist) and entrained organic acid are present in the exhaust gas and are the main potential atmospheric pollutants. The recommended practice is to use an electrostatic precipitator (ESP) to trap any particulate material in the form of mist or aerosols and a caustic soda scrubber which absorbs SO2 and small amounts gaseous SO3 that will pass the ESP. 

As many emissions involve chlorinated compounds, corrosion is a major problem in many control methods. The corrosion of columns and surface condensers can be prevented or reduced by the correct material selection. However, corrosion remains a constant threat to the interior of incinerators. Additional pollution control equipment such as scrubbers may also be required to remove acidic compounds from treated gases before discharging into the atmosphere. 

In large facilities and offshore platforms where the escaping gases and liquids could present a source of pollution or ignition, it is common to route the relief valve discharges into a common header that discharges at a remote safe location. Often a vent scrubber is installed in this header to separate the bulk of the liquids and to minimize the possibility of liquid discharges to atmosphere. 

The pollution abatement systems, including scrubbers and electro-static percipitators, etc., assure that no agent or hazardous materials are reUased to the atmosphere. 

Another important use of lime is in pollution control. Many factories release harmful gases into the atmosphere through smokestacks. Lining a smokestack with lime allows some of these gases to be captured. The lime is known as a scrubber. Lime captures one harmful gas, sulfur dioxide (SO2), which is a contributor to acid rain (a form of precipitation that is significantly more acidic than neutral water, often produced as the result of industrial processes) ... 

Fly ash Airborne bits of unbumable ash that are carried into the atmosphere by stack gases coal ash that exits a combustion chamber in the flue gas and is captured by air pollution control equipment such as electrostatic precipitators, baghouses, and wet scrubbers. 

Air pollution control APC units (cyclone, venturi scrubber, tangential spray scrubber, spray tower, ID fans, chimney) This is required to absorb the gases evolved from reactor and den for air pollution control HF will be released into atmosphere and cause air pollution Monitor operation of APC units and exit gases all the time... 

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