Use the following approaches to evaluate the capabilities of scrubbing systems: empirical relationships,theoretical models, and pilot scale tests.
• Two important parameters in the design and operation of wet scrubbing systems that are a function of the process being controlled are dust properties and exhaust gas characteristics.
• Particle size distribution is the most critical parameter in choosing the most effective scrubber design and determining the overall collection efficiency.
• Static pressure drop of a system is dependent on the mechanical design of the system and collection efficiency required.
• The scrubber used most often to remove particulate matter from exhaust systems is a Venturi scrubber.
• The term penetration is defined as the fraction of particles that passes through a scrubber uncollected.
• No one simple equation can be used to estimate scrubber collection efficiency for all scrubber types.
• Efficient particle removal requires high gas-to-liquid (relative) velocities.
• The infinite throat model is used to estimate particle collection in Venturi scrubbers.
• The contact power theory is dependent on pilot test data to determine required collection efficiency.
• The total pressure loss, or contacting power, of the scrubbing system is represented by PT = PG + PL, the symbol PT.
• Efficient particle removal requires high gas-to-liquid (relative) velocities.
• According to the contact power theory, the higher the pressure drop is across the scrubbing system,the higher the collection efficiency will be.
• The following factors affect the pressure drop of a scrubbing system: scrubber design, gas velocity,and liquid-to-gas ratio.