Direct Steam Technology Expands Production Capacity
A leading Israeli dairy producer has expanded its production capacity for plant-based drinks with the installation of an HRS DSI Series pasteuriser.
The client is one of the largest dairy and food companies in Israel and having previously brought in plant-based drinks in bulk from an associated European company for bottling, in 2021 they invested in a new production line to allow them to process raw materials (such as oats, soybeans, coconut and hazelnut) in-house as part of an expansion of their dairy alternatives business. Before this the company had to import part-processed products from an associated facility in Europe.
The new production facility includes many elements including grinding, extraction and bulk supply for bottling elsewhere. One of the challenges was the space available for the UHT portion of the production facility.
The HRS DSI (Direct Steam Injection) forms part of a complete UHT (ultra-heat treatment) system supplied by HRS for integration into the new production facility. HRS was able to design a complete, cost-competitive heat treatment solution based around the HRS DSI and other heating and cooling technologies which was skid-mounted to facilitate installation and commissioning in the available space. Direct steam injection provides a number of advantages over traditional UHT systems based on heat exchangers, particularly when it comes to the viscous nature of plant-based ‘milk’ drinks.
“With direct steam injection you get a sudden and immediate increase in temperature,” explains Francisco Hernández Ortiz, food business development director at HRS Heat Exchangers. “We have standard pre-heating phase using an HRS MI Series heat exchanger which takes the product to 80°C, and we then inject the steam which immediately increases the product temperature to 140°C. A flash cooler is then used to return the product to 80 °C within a few seconds, so the heat has time to pasteurise the product, but other heat effects, such as caramelisation, do not have time to occur.”
After this chilled water and a glycol solution are used to cool the product to the final temperature of 4°C.A second major advantage of using steam injection rather than traditional heat exchanger technology is that it avoids issues with fouling of the heat exchanger, which can be a problem with the viscous nature of some plant-based drink products. “As there is no heat exchanger, there is no surface and so there is no fouling,” says Francisco.