Feature

Green Liquor Dregs Solution to Achieve New Environmental Standards

Posted on 08 February, 2010 | Tags: Case Study

Energy efficient pressure filter solution supplied by Larox Corporation to Stora Enso's Fluting Mill Power Plant in Heinola, Finland enabled the power plant meet with stringent waste handling requirements in optimized manner resulting in substantial cost reductions.

The Larox C Series Automatic Pressure Filter - an Optimal Solution Larox C series automatic pressure filter offers excellent solution to clarified green liquor cake filtration. The filter can be used with or without cake washing, as needed. The residual sodium oxide levels of the filter cake can even remain under 1.0 percent w/w.The Larox C series automatic pressure filter is designed for chemical processing industries. This filter enables exceed the strict requirements, concerns regarding the end product quality and uniformity as well as production efficiency, reliability and safety.
Stora Enso is an integrated paper, packaging and forest products company, producing newsprint, magazine paper, fine paper, consumer board, industrial packaging, and wood products. Stora Enso's Heinola Fluting Mill and Larox have cooperated in the development engineering of the green liquor dregs filtration process for a long time. As a result of this cooperation a contract was signed in 2006 on the delivery of the Larox green liquor pressure filter to the recovery boiler SK 2 plant. The  filter was commissioned in the summer of 2007 after conducting thorough filtration tests, a precise research project and installation and training campaigns.
The personnel of Stora Enso Fluting Mill are very satisfied with the results. The manager of power plant, Mr Erkki Vuori said that the filter solution could even be considered as a major environmental achievement as due to the drying process in the filter, the dump volume and waster transportation costs were reduced by almost 70 percent. The cake moisture dropped below 20 percent, which meant dry solids in cake filter above 80 percent. The Larox C Series Automatic Pressure Filter delivered for this process is one of the first of this technology supplied in Finland for green liquor dregs filtration.
 Petteri Taavitsainen, Senior Manager of Sales Support and Deliveries, was responsible for the delivery process of the filtration solution to Heinola Fluting Mill. He told that the Larox green liquor dregs pressure filter solution, delivered to Heinola Fluting Mill's recovery boiler SK 2, went through a thorough test filtration campaign on the mill's own dregs slurry samples. As a result of this procedure, the applicability of the solution could be guaranteed.

Heat Resistant and Easy to Use
Sami Kalami , Departmental Engineer of the Heinola Fluting Mill Power Plan observed that the Sami Kalami , Departmental Engineer of the Heinola Fluting Mill Power Plan observed that the sizing of the equipment was precisely correct . Service reliably provided the specific technical solutions to meet the stringent requirements set by the high temperatures in the power plant.  The green liquor temperature at the power station could be as high as +90 degree Celsius that was much higher than the other mills across the world. The filter at the power station is in continuous operation, i.e. its availability rate is high. We could not be more satisfied," Kalmi emphasizes. Kalmi also praises the Larox pressure filter as very easy to use. The highly automated pressure filter is fully automatic in operation and the user friendly control panel is seldom needed. ''Operation and maintenance training was thorough, the number of sessions met our needs and the consultation was of good quality" Kalmi adds. Petteri Taavitsainen confirms: "After sales service is a matter of honor to Larox. Our worldwide and 24 h/d service  availability makes Larox a reliable and trustworthy partner."

Globally Desired Environmental Technology
Larox Pressure Filter has been developed to meet the strict and demanding environmental norms worldwide. These filters offer solution to the current and future challenges of the chemical process industries. The advanced technology offered by Larox is based on decades -long experience and these solutions have a world wide demand and good future market prospects.
Larox C Series automatic pressure filter provides higher separation efficiency than any alternative technology. Filter is highly energy efficient in operation. The filter results in significant reduction of amount of recyclable alkali and also reduces the waste transportation volumes to a fraction as compared to the current technology and also the positive impact on the environment specifies Heikki Kupias, Larox Sales Manager. Petteri Taavitsainen adds that cost benefits related to the process's alkali and transportation costs can also be achieved, "When alkali is recovered by using the Larox pressure filter, it can be stored and re-used later on in the process that results in significant reduction in total production costs."

Article Courtesy Larox Corporation
Contact: Pramod Vaidya Senior Manager Marketing
Mc Nally Bharat Engineering Co. Ltd
Email: pv@mcnallyblr.com