The purpose of the air loop is to control a volumetric flow of air through the column or to maintain a three-phase density within the vessel. In basic control systems air rate is controlled manually based on a monitored air flow rate. In slightly more advanced systems, the flow is controlled through an automatic valve to compensate for pressure changes (Figure 2).

Figure 2 Example of air control loop. PI, pressure indicator; FIT, flow indicator and transmitter; FIC, flow indicator and controller; FY, flow D/A signal conversion; FCV, flow control device.

Air rate may be linked to predictive- or recovery-based systems.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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