Balancing Valves
Coal flow balancing is one of the key processes for better combustion. Therefore, many technical attempts have been made to influence the two-phase pulverized coal flow. These attempts have resulted in a wide variety of technical designs with varying degrees of success. However, common designs remain inadequate, particularly regarding long-term functionality and ease of
installation.
The PBG-1 Valves represent state-of-the-art technology for coal flow balancing. These patented high-performance devices have been engineered to meet the requirements for continuous operation in dynamic coal flow balancing systems.
Some features are listed below:
Two-Phase flow is highly controllable
Least pressure drop < 4mbar
High wear resistant surfaces
Easily upgradebale for automation​​
Installed PGB-1 spools
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PBG-1 Valve installation on top of the G2 mill at the Saint John’s River Power Park in Jacksonville, Florida. A total of 14 mills, respectively 56 burner pipes were equipped. The valves were used in a permanently controlled loop without any failures in operation or functionality.
CFD-Modellings
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Computational Fluid Dynamics (CFD) applies numerical methods and algorithms to analyze and calculate challenges involving fluid flows. It was used to simulate the interaction of the two-phase flow and its surfaces, which are defined by boundary conditions.
Valve location
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Combustion optimization starts at the source of the majority of misdistribution issues. Therefore, it was of prime importance to install the valves as close as possible to the outlet of each pulverizer. Meanwhile, we have gained experience with valve installations further downstream from individual mill outlets. Coal flow balancing has been successfully executed even beyond riffle boxes.
Mainova AG
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PBG-1 Valve installation in a inclined
location at Mainova AG Germany.
