--- title: Case study DSM Falling Film Technology | Bronswerk Heat Transfer description: Read how Bronswerk Heat Transfer made it possible for DSM to efficiently generate vacuum steam using falling film technology. --- [![Bronswerk Heat Transfer](https://www.bronswerk.com/hs-fs/hubfs/website_assets/logo-2.png?width=235&height=44&name=logo-2.png "Bronswerk Heat Transfer")](https://www.bronswerk.com/) - [Industries](https://www.bronswerk.com/industries) - [Oil](https://www.bronswerk.com/oil-industry) - [Gas](https://www.bronswerk.com/gas-industry) - [Chemical](https://www.bronswerk.com/chemical-industry) - [Power](https://www.bronswerk.com/power-industry) - [Food](https://www.bronswerk.com/food-industry) - [Pulp & Paper](https://www.bronswerk.com/industry-pulp-paper) - [Expertise](https://www.bronswerk.com/our-expertise) - [Customer Needs & Requirements](https://www.bronswerk.com/customer-needs-and-solutions) - [Project Management](https://www.bronswerk.com/project-management) - [Performance & Reliability Improvement](https://www.bronswerk.com/performance-and-reliability-improvement) - [Innovation & Sustainability](https://www.bronswerk.com/innovation-sustainability) - [Process Equipment from Exotic Materials](https://www.bronswerk.com/process-equipment-exotic-materials) - [Project Specific Manufacturing](https://www.bronswerk.com/project-specific-manufacturing) - [Case studies](https://www.bronswerk.com/case-studies) - [Solutions](https://www.bronswerk.com/solutions) - [Air-Cooled Coolers](https://www.bronswerk.com/air-cooled-coolers) - [Shell & Tube Heat Exchangers](https://www.bronswerk.com/shell-tube-heat-exchangers) - [Heat Transfer Systems](https://www.bronswerk.com/heat-transfer-systems) - [Request for Quotation](https://www.bronswerk.com/request-for-quotation) - [Services](https://www.bronswerk.com/services-and-maintenance) - [Request for Quotation](https://www.bronswerk.com/request-for-quotation) - [News](https://www.bronswerk.com/news) - [Contact](https://www.bronswerk.com/contact) - [Request for Quotation](https://www.bronswerk.com/request-for-quotation) [![search](https://www.bronswerk.com/hubfs/search-icon-white.svg) ![search](https://www.bronswerk.com/hubfs/search-icon.svg)](https://www.bronswerk.com/hs-search-results) [Call us: + 31 33 24 72 500](tel:0031332472500) Case study ![Falling Film Evaporator](https://www.bronswerk.com/hubfs/Images/Shell%20and%20tube%20heat%20exchangers%20fotos/2.07%20-%20falling%20film%20evaporator/2.07%20-%20falling%20film%20evaporator%20foto%2001.jpg) ## The right way to design a Falling Film Evaporator How Bronswerk Heat Transfer made it possible for DSM to efficiently generate vacuum steam using falling film technology. Passionate about heat exchange. [![Talk to our specialists](https://no-cache.hubspot.com/cta/default/6739931/506626d7-c2e1-4be2-9119-c5eb31a20206.png)](https://cta-redirect.hubspot.com/cta/redirect/6739931/506626d7-c2e1-4be2-9119-c5eb31a20206) Our solution ## 0.58 bar(a) ### Vacuum steam production   **The project in short** - Project: Mechanical Vapor Recompression - Client: DSM - Product: Steam Generator - Industry: chemical - Request: generating large scale subatmospheric steam - Restriction: size, cost, and operability - Solution: customized design ![Falling Film Evaporator in front of Bronswerk's headquarters](https://www.bronswerk.com/hubfs/Images/Shell%20and%20tube%20heat%20exchangers%20fotos/2.07%20-%20falling%20film%20evaporator/2.07%20-%20falling%20film%20evaporator%20foto%2003.jpg) ## Mechanical Vapor Recompression Steam Generator for DSM DSM was planning a new ammonium sulfate crystallization plant. Waste heat was available from the nearby Caprolactam plant. Waste heat from this plant needed to be upgraded to a usable temperature by using Mechanical Vapor Recompression (MVR) heat pump technology. #### Customer challenge The challenge was to generate sub-atmospheric steam on this large scale, while minimizing the temperature and pressure loss of this generated steam flow. We designed and supplied falling film evaporators that made it possible to capture the waste heat in steam and upgrade to a usable temperature level for use in the ammonium sulfate crystallization. In order to apply a vapor recompression the waste heat of the Caprolactam process is Sulfuric acid that can be cooled from 110°C to 90°C. With this waste heat the customer wants to generate 0.58 bar(a) steam. Classically this would be done in Kettle Type Steam Generators, however in these vacuum conditions the liquid level will suppress the boiling. This leads to very low heat transfer coefficient and large surface area required, making the project impossible to execute. #### Our approach Bronswerk Heat Transfer was consulted whether they could design a Heat Exchanger that met the project requirements with respect to size, cost and operability. We found that a Kettle Type Reboiler would require too large surface area and we needed to move away from having a high liquid level in this kind of application. #### The solution The solution we designed takes away the liquid level by applying the falling film principle. Steam is generated inside the tubes by applying only a thin film of water on the inside of the tubes. The boiler feed water recirculates with a certain ratio to ensure continuous wetting of the tubes. The complete water circulation control and distribution is integrated into the heat exchanger design.  #### Do you have a challenge? 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