Electron Machine Corporation has been actively refining the use of refractometers for measuring green liquor density for over 30 years. Our incremental efforts in this application has led to the current system of using the MPR E-Scan refractometer combined with heated high-pressure water for cleaning. The resulting combination provides an effective removal of optical coatings by reducing thermal changes. Minimizing maintenance to allow for a reliable measurement source for on-line automatic control.
The rugged and reliable MPR EScan is used to measure the green liquor dissolved density, or TTA, at two stages in the process: after the green liquor dissolving tank and after the green liquor clarifier. The in-line measurement, with the refractometer sensing head installed directly in the main process lines, allows real-time control of green liquor dilution to meet target TTA set-points. The measurement is also used to indicate (and prevent) excessive green liquor density and the resulting dangerous impending crystallization within the dissolving tank.
The difficult scaling associated with green liquor results in an optical coating on the refractometer sensing head. If this scaling can be controlled to allow an acceptable duration of on-line measurement, and then effectively removed when coating occurs, the accuracy of the refractometer can be fully utilized with minimal maintenance. The primary issue then becomes the maintenance required to keep the cleaning system operating effectively.
Reducing the variation of green liquor solids by automatically controlling weak-wash dilution with the MPR E-Scan refractometer results in a reduction in scaling. Scaling issues are further reduced when pressurized water, heated to the process temperature, is used to effectively clean the refractometer optical components. The compound result is beneficial for both control and maintenance.

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Refractometers have long to be the instrument of black liquor solids Electron Machine pioneered this technology accurately measure black dissolved solids nearly 50 ago. The MPR E-Scan digital accuracy with components required for years reliable
use when installed harsh industrial This combination allows for integration into your monitor and/or control needed for efficient control, remains easy to service.
Evaporation:
By installing the Electron Machine
Corporation MPR E-Scan with Isolation Valve Adapters before
and after each evaporator effect, the concentration and temperature output can be utilized to monitor efficiency, detect problems and operate economically. This monitoring allows control operators to adjust steam usage for optimal solids evaporation. Operators can determine if a quick flush cleaning can be performed to improve efficiency, prolonging the time between invasive, labor intensive cleanings. It also allows the detection of any problems before the liquor reaches the boiler, plus provides a consistent solids percentage for firing.
Application: An important and overlooked area for refractometers is With the addition of the Electron Machine Corporation the pulp washing operation. By monitoring the MPR E-Scan to a mills process control system, a concentration output the washers can be balanced to company can see increased profitability through the meet the needs of the evaporation process and a mill is optimized control of steam usage, reduced labor cost able to regulate the mixing liquor. This control allows a from the reduction of offline hand sampling and the consistent concentration supply to the evaporators and ability to prolong the time between labor intensive offline boiler. This installation is simple and greatly reduces hand cleanings. This greater control provides more consistant sampling. firing solids allowing boilers to operator more efficently.
For more information E-Mail:electronmachine@163.comor call 13761079671

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