14 ANDRITZ


Zhang says: “This was the perfect solution for Henan Tianbang as it got the best of both worlds; the cost efficiency of using previously owned equipment and the very latest from Andritz in technology and process design.”


The Andritz P-RS APMP system The advanced and patented Pre- conditioning Refiner Chemical Alkaline Peroxide Mechanical Pulping (P-RC APMP) technology applies chemicals – sodium hydroxide (NaOH), and hydrogen peroxide (H2O2) – in impregnation and after the primary refiner. The HC bleaching tower is located immediately after the primary refiner, but before secondary refining and screening. A dewatering and washing stage is added after the HC bleaching tower to provide high consistency for the second-stage refiner and to remove detrimental substances. The rejects from the screens are treated in a new low-consistency refiner to remove shives to a minimum and improve fibre quality. At the end of the process,


Pulp Paper & Logistics


Gong Qunfei, project director and general engineer at Henan Tianbang


a pulp-screw press dewaters the pulp to high consistency and reduces COD to a minimum before the pulp is loaded to trucks. Commissioning and start- up of the line took place in 2017 between the middle of September and the end of October, with very few reported challenges. Gong Qunfei, project director and general engineer at Henan Tianbang says: “We were very impressed with the knowledge that Andritz had, particularly when it came to installing and commissioning the


Mechanical pulp from the ANDRITZ P-RC APMP system


20-year-old Hymac equipment. A lot of the information Andritz engineers were using came from the original manuals that came with the equipment. It was amazing how they used their knowledge and expertise to make the old and new work together. “Start-up went with virtually no hitches at all as there was a lot


of pre-planning carried out by Andritz before the installation to make sure all the various components fitted perfectly well together.”


Freedom and profit The mill is now totally self- sufficient for its mechanical pulp needs, and crucially the quality of


March/April 2019


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