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Warum indirekte Lufterwärmung im Sprühtrocknungsprozess zur Norm wird DE
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20.05.2025  |  520x
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Munters VariMax IFRG (Indirect-Fired Recirculating Gas) heater
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Why indirect heating is becoming the norm in spray drying

Spray drying plays a crucial role in the food industry, and the technology behind this process has made significant advances. Indirect heating systems are increasingly replacing traditional direct systems.
Here are five reasons why this shift is taking place and what benefits it brings.

1 Safety and health first

Consumer safety is of paramount importance. Direct heating systems can introduce combustion products such as nitrates and nitrites into the final product, compounds that are potentially carcinogenic. Indirect heating completely eliminates this risk, resulting in safe and high-quality food products.

2 Energy efficiency and sustainability

Although direct systems appear efficient in energy transfer, they add extra moisture to the process, reducing drying capacity by 15-30%. Indirect heating eliminates this moisture problem, lowers energy consumption and significantly reduces emissions. This leads to lower costs and a smaller carbon footprint.

3 Safety in the production environment

Spray drying can generate dust that can be explosive on contact with open flames. Indirect heating systems completely separate the flame from the process airflow via a heat exchanger, significantly reducing the risk of dust explosions and improving plant safety.

4 More stable process and better product quality

Direct heating systems can cause variations in process flows due to varying fire speeds and humidity. Indirect systems offer a more stable and constant flow, allowing perfect drying of products with low humidity requirements.

5 Industry trends and clear market preference

Although direct systems are still being installed, indirect heating systems dominate the market: 90% of recent spray dryer installations are indirect. This shift reflects the increasing demand for safety, efficiency and stability.

Discover the benefits of indirect heating in spray drying

Indirect heating systems meet today’s demands for safety, durability and quality. They fit seamlessly with both consumer needs and the strict regulations of authorities such as the FDA.
  • No harmful combustion products or excess moisture.
  • Improved product quality and food safety.
  • Higher drying capacity and lower operating costs.
  • Reduced emissions and a more sustainable production process.

Company information

Munters GmbH
Munters GmbH
Munters is a global leader in climate solutions for mission-critical processes. We offer innovative, efficient and sustainable solutions for customers in industries where controlling indoor humidity, temperature and energy efficiency is mission-critical. Climate control systems often account for a large percentage of the energy consumption in many of our customers’ operations. With an optimal climate system, we can help them to more efficiently use energy or water resources, and thereby reduce their climate and environmental impact. Sustainability is an important part of Munters’ business strategy and value creation.
Last update: 20.06.2025

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