Power generation plants rely on boilers and feedwater heaters to produce necessary steam. Because modern high-pressure boilers evaporate several million pounds of water every working hour, the purity of feedwater circulating inside the boiler is essential.
Ensuring pure feedwater can be achieved using different methods. A feedwater evaporator can be used as an alternative method to chemicals by removing impurities through evaporating raw water with extraction steam. However, most often the purity of feedwater is achieved by chemical treatment. This chemical treatment takes place in demineralization tanks, which transform the raw water into water that will not harm or corrode the boiler.
Magnetrol® has produced an applications brochure for the power and utilities industry, detailing measurement challenges and solutions for each step of the power generation process. This blog post is part of an occasional series exploring each application in detail.
Level Measurement Challenges and Considerations
Because support chemicals for water treatment can include caustics, sodium hypochloride, sulfuric acid or other additives, it is important to choose level instruments that will be able to withstand these harsh conditions. Managing the water supply level requires instrumentation that maintains its accuracy even when exposed to chemicals. Small nuances in how the demineralization tanks are monitored relative to level technology can have a dramatic effect on the day-to-day practicality and reliability of the type of instrument(s) used. Individual chemistry and storage requirements will dictate the level instrumentation selected.
Level Measurement Solutions
MAGNETROL has produced level measurement solutions for demineralization tanks:
For point level:
Models T52 or T62 float-actuated switches
For continuous level:
Eclipse® Model 706 guided wave radar transmitter or E3 Modulevel® displacer-actuated transmitter
For more information on level solutions for demineralization tanks and other power generation applications, download the power industry brochure.