Refractometer Products for Green Liquor

Green liquor is the dissolved concentration of sodium sulfide, sodium carbonate, and other compounds from the recovery boiler in the paper making process.

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.
Green Liquor Products
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.

HPC Adapter with HP Water Prism Purge PAK System

Boiler Feed Green Liquor
  • Cleaning nozzles - Removable nozzles reduce maintenance.
  • High pressure solenoids - Ensure heated water is used to clean the optical components. Rated 3500psi.
  • Adapter - Various pipeline sizes and F/F dimensions.
  • Cost effective - No secondary pump to install and maintain.

HPC Adapter with EMC HPC-2 System

Boiler Feed Green Liquor
  • Cleaning nozzles - Removable nozzles reduce maintenance.
  • High pressure solenoids - Ensure heated water is used to clean the optical components. Rated 3500psi.
  • Adapter - Various pipeline sizes and F/F dimensions.
  • 5HP Motor & Pump - Mounted on skid, capable of 2000psi w/adjustable regulator.

The World's Most Rugged In-line Process Refractometer | Call Today 352-669-3101

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