ANDRITZ LimeDry-H lime mud drying system

As pulp producers come under increasing pressure to maximize efficiencies across the whole mill, ANDRITZ has identified key areas where gains can be made in the white liquor plant. Utilizing some of the proven concepts featured on the latest LimeWhite-H White Liquor Disc Filter,  for example the implementation of center shaft axial movement, and an advanced lime mud feeding to the vat – ANDRITZ has applied similar, tailored principles to its LimeDry-H lime mud drying system. The end result is a much more simplified vat construction and stable feeding system, providing increased homogenous lime mud which enables less swinging of temperatures in the flue gases of the lime kiln, and ultimately savings in energy. 

Simple and smart – lime mud drying just got easier

The new system comes with a smaller footprint, which saves space and investment costs, as well as an updated design which improves maintenance access and provides a safer working environment.   

Additionally, ANDRITZ is bringing autonomous white liquor plant technologies into the lime mud feed area with the introduction of various tools to help operators analyze and manage the system remotely, further improving efficiencies.  

One of the most important developments to be applied to LimeDry-H is the introduction of an oscillating hollow central shaft which moves back and forth in an axial direction of up to 6 mm. With the fixed scraper, this movement allows the constant renewing of the surface of the lime mud. This feature has provided ANDRITZ the opportunity to modify the CPR (Continuous Pre-coat Renewal) system by eliminating the low-pressure wash which affects the quality of the lime mud. High-pressure washing remains to ensure the continuous renewal of the precoat and efficient cloth wash. All this results in a more simplified process which ensures more stable dryness and feed of lime mud to the lime kiln.

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