oa South African Journal of Chemical Engineering - Nonmechanical control of solids flow in single and multi-loop systems

Volume 17, Issue 1
  • ISSN : 1026-9185



In most gas solids processes involving substantial solids circulation around one or two loops, the circulation rate around the loop is controlled by a valve - typically a slide valve. However, many new process such as chemical looping processes, operate at higher pressures and pressures than the previous processes, and solids flow control using a slide valve is either to expensive or not possible. This is because slide valve technology does not presently extend to the high temperatures and pressures used in many of the new processes.

Therefore, developers are turning to nonmechanical means to control the solids flow around the solids flow loops. This paper describes the principles involved in nonmechanical control of solids around a loop, and the advantages and disadvantages of the various types of nonmechanical solids flow control systems.

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