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Question
Study the image given below and identify the function of the part labelled as A.
Study the image given below and identify the function of the part labelled as A.
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Solution
The correct option is A To spray lime or water
Air pollutants are agents which upon addition to air can cause undesirable changes in its physical, chemical or biological characteristics and pollute it. These pollutants can be gaseous compounds (SO2, NO2) or particulate matter (dust, soot).
The image given in the question is of a scrubber. A scrubber is a device used to remove air pollutants like sulphur dioxide which are present in exhausts from thermal power plants, industries, etc.
Scrubber consists of a tower like structure with nozzles to spray lime or water. The part labelled as A in the image is the nozzle through which lime or water is sprayed. It is not used to collect hydrocarbons. Hence option a is correct and option b is incorrect.
Dirty air containing particulate matter or sulphur dioxide is passed into the tower. As the flue gases in the tower rise up, it is made to pass through a spray of water or lime. Sulphur dioxide present in flue gases (exhaust gas) reacts with water or lime solution to form calcium sulphite.Thus sulphur dioxide is collected as calcium sulphite and removed from the scrubbing tower. Clean air from particulate matter leaves the tower from top and is let out to the atmosphere through smokestacks (a chimney or funnel for discharging smoke).
Electrostatic precipitators are devices used to remove particulate pollutants from the exhaust of thermal power plants. These consist of electrode wires that are maintained at several thousand volts to produce a corona that releases electrons which attach to dust particles. The collecting plates with positive charges in the precipitators are grounded to attract charged dust particles. These dust particles are collected and removed. Hence option c and d are incorrect.
Air pollutants are agents which upon addition to air can cause undesirable changes in its physical, chemical or biological characteristics and pollute it. These pollutants can be gaseous compounds (SO2, NO2) or particulate matter (dust, soot).
The image given in the question is of a scrubber. A scrubber is a device used to remove air pollutants like sulphur dioxide which are present in exhausts from thermal power plants, industries, etc.
Scrubber consists of a tower like structure with nozzles to spray lime or water. The part labelled as A in the image is the nozzle through which lime or water is sprayed. It is not used to collect hydrocarbons. Hence option a is correct and option b is incorrect.
Dirty air containing particulate matter or sulphur dioxide is passed into the tower. As the flue gases in the tower rise up, it is made to pass through a spray of water or lime. Sulphur dioxide present in flue gases (exhaust gas) reacts with water or lime solution to form calcium sulphite.Thus sulphur dioxide is collected as calcium sulphite and removed from the scrubbing tower. Clean air from particulate matter leaves the tower from top and is let out to the atmosphere through smokestacks (a chimney or funnel for discharging smoke).
Electrostatic precipitators are devices used to remove particulate pollutants from the exhaust of thermal power plants. These consist of electrode wires that are maintained at several thousand volts to produce a corona that releases electrons which attach to dust particles. The collecting plates with positive charges in the precipitators are grounded to attract charged dust particles. These dust particles are collected and removed. Hence option c and d are incorrect.
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