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Recovery boiler selective catalytic reduction - a retrofit case

SCR – Selective Catalytic Reduction is a well-established and widely used technology for NOx removal from power boiler flue gases. Target emission levels are decreasing and SCR will soon be needed for recovery boilers. This article is an abstract of a white paper which presents a study for a retrofit case using SCR to lower NOx from 200 to 100 mg/m3 (6% O2, dry gas), including implementation of some high power features.

Six problems in the evaporator stage and possible solutions

Evaporators are used to evaporate black liquor from approximately 15% dry solids to 70-85% dry solids. Operating issues include scaling, corrosion, liquor carry-over, vacuum, condensate segregation and foaming liquor. Each can be mitigated with process and technology changes.

Methanol - from pulp mill waste byproduct to valuable fuel

Technology has been used for several years to liquify methanol from SOG. A new process has been developed to produce purified methanol that can be sold as a green renewable fuel, transforming an undesirable waste byproduct into a potential new revenue stream for the pulp mill.

Valmet Tissue Technology Webinar - learn from the leader

Valmet's free webinar is an information packed hour of presentations and Q&A that will bring you up to date on the latest in tissue making technology, from the headbox to the rereeler, including automation that assists operators in making the best decisions.

Merger of Valmet and Neles: Forward together from a stronger base

Over the years, Neles and its predecessors have developed capabilities that position us as a best-in-class player in our field. Now, we look forward to accelerating this agenda as part of Valmet. The key message to our customers is: our capabilities and know-how are even stronger. In fact, we are operating from a stronger base and with wider offering, covering more markets and leveraging our global reach in a more efficient manner.

How to choose control valves?

Control valve requirements often differ depending on the process area, application and end user specifications. Process conditions and the range of parameters also vary widely, including pressure, temperature, controllability, cavitation risk, environmental impact, noise and more. Plus, priorities may differ. An end user may want to know more about a valve’s performance, controllability and total life-cycle cost, whereas an EPC contractor may be more concerned about the CAPEX-related costs and delivery times. How do you know where to start – and where to turn for help with quality information you can rely on?

We make customer service up close and personal

Reliability is a core element of what we as a valves partner want to provide. Being close to our pulp and paper customers and having an in-depth understanding of their production processes is a prerequisite for good service. As a Resident engineer at a customer mill, I have a unique point of view in terms of customer proximity and understanding.

Gaining deeper insight to solve valve cavitation

Since cavitation is one of the most significant causes of wear, it is important to control the impact of the fluid flow. Using advanced computational fluid dynamics (CFD) to model cavitation helps you reach quicker, more efficient results and deeper insight for your designs, avoiding any premature failure of your control valves.

3 steps to ensure ESD valve reliability beyond certification

Final elements, such as ESD valves, are a critical part in the safety lifecycle. When they are not working properly, the safety of the entire plant is in jeopardy. To ensure overall plant safety, correct ESD valve selection plays a vital role. A lot of uncertainty prevails around the relatively new standards IEC 61508 and IEC 61511 and how they should be interpreted for safety valves. This blog post looks closer at this issue and sheds some light on what is an essential but confusing subject.

Valves in delayed coking units – why they matter

Refineries need to improve profitability to stay competitive in today’s market. Delayed coking for heavy and sour oil refineries is potentially one of the most profitable operations available to refiners. Since 1994, almost all residue upgrading in the US has been done with delayed coking. And although coking technology may seem mature, innovations continue to bring improvements.