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Modeling Mercury Removal by Sorbent Injection.

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Summary
This summary is machine-generated.

This study models mercury removal from coal plant emissions using sorbents. It predicts how sorbent properties and injection methods impact mercury capture efficiency in flue gas treatment.

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Area of Science:

  • Environmental Engineering
  • Chemical Engineering
  • Atmospheric Chemistry

Background:

  • Coal-fired power plants are a significant source of mercury emissions.
  • Potential regulation under the Clean Air Act Amendments necessitates effective mercury removal technologies.
  • Sorbent-based mercury capture is a key area of research for emission control.

Purpose of the Study:

  • To develop a theoretical model for predicting mercury removal efficiency in flue gas.
  • To evaluate the impact of sorbent properties and duct injection configurations on mercury capture.
  • To differentiate between mass transfer and sorbent capacity limitations in mercury removal processes.

Main Methods:

  • Laboratory evaluation of sorbent adsorption characteristics.
  • Development of a theoretical model integrating adsorption and mass transfer.
  • Simulation of mercury removal in duct injection processes upstream of electrostatic precipitators (ESPs) and fabric filters.

Main Results:

  • The model predicts mercury removal based on sorbent properties and flue gas conditions.
  • Sorbent injection upstream of ESPs and fabric filters yields different removal efficiencies due to varying mass transfer conditions.
  • Identified conditions where mercury removal is limited by mass transfer versus sorbent capacity.

Conclusions:

  • Mercury removal efficiency can be enhanced by optimizing sorbent particle size and increasing sorbent capacity.
  • Increased sorbent injection rates consistently improve mercury removal.
  • The model provides a framework for designing and optimizing sorbent-based mercury control strategies for power plants.