Slaker Heating With Precision Green Liquor Heating
What is Green Liquor in Paper Industry?
Green liquor found in the paper industry is the dissolved smelt found in the recovery boiler during the kraft process. This is a combination of sodium carbonate, sodium sulfide, and other components. It gets its name from its appearance of green that appears due to the small amount of iron hydroxide that is in the liquid.
Green Liquor in Kraft Pulping Process
Green liquor is part of the Kraft pulping recovery process. Pulp producers have several technology options when determining how they want to heat their green liquor: A Hydro-Thermal Industrial Hydroheater, sparging, a shell and tube heat exchanger, or doing nothing at all. If a producer chooses to not heat their green liquor, then they are most likely experiencing uncontrolled temperature or their liquor may already be too hot for the slaker.
How Hydroheaters Give Precision Green Liquor Heating
The Hydro-Thermal Industrial Hydroheater is the preferred technology for many pulp processors because it has several key benefits:
- Precise temperature control to the slaker
- Improves slaker/causticizer efficiency
- Efficient lime use resulting in an improved conversionrate
- Reduces dusting at the lime kiln
- The heating is done in-line just prior to the slaker which heats 100% of process flow.