Boiler Water Level Control System

Steam boilers are very common in industry principally because steam power is so useful. The standard single element boiler water level control system with proportional control gives excellent control on the majority of boiler installations. The control of water level is a major function in this process and it is achieved through a water steam interface established in a cylindrical vessel called the drum which is usually lying on its side and located near the top of the boiler.

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Measured variables or elements are steam flow drum level and feed water flow.

Boiler water level control system.

A three element boiler water level control system is shown in figure above. Fig boiler water level control a three element control system is shown in figure. A steam engine moving some sort of machine heating producing vacuums through the use of steam ejectors and augmenting chemical. The universal electronic water level controller provides precise control that compensates for wave action and manages water levels to within 1 8 of operating range.

This posts helpful to understand the basic principle of a control loop and its components. The measured variables or elements are steam flow drum flow and feed water flow. Since in a balanced situation steam flow must equal feed. This is because of the fact that as the steam demand increases the pressure in the boiler drops causing the water level to rise.

This post explains the simple closed loop function with the example of boiler water level control system. However with single element proportional control the water level must fall for the feedwater control valve to open. Common uses for steam in industry include doing mechanical work e g. As with the transmitter the controller in this system is pneumatic operating entirely on compressed air.

The controller then generates an output signal telling the control valve to either introduce more or less water into the boiler to maintain the steam drum water level at setpoint. If the level is too high flooding of steam purification equipment can occur. Since in a balanced situation steam flow must equal feed flow these two signals are compared in a differential relay. Boiler drum level control systems drum level control systems are used extensively throughout the process industries and the utilities to control the level of boiling water contained in boiler drums on process plant and help provide a constant supply of steam.

Controlling the boiler drum level is complicated as the water level in a steam drum is actually a fairly unstable mixture of water and steam bubbles that shrinks and swells as the pressure changes.

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