We use cookies, similar technologies and tracking services

This website uses cookies, similar technologies and tracking services (hereinafter referred to as “Cookies”). We need your consent for Cookies, which not only serve to technically display our website, but also to enable the best possible use of our website and to improve it based on your user behavior, or to present content and marketing aligned with your interests. For these purposes, we cooperate with third-party providers (e.g. Salesforce, LinkedIn, Google, Microsoft, Piwik PRO). Through these partners you can also receive advertisements on other websites.
If you consent, you also accept certain subsequent processing of your personal data (e.g. storage of your IP address in profiles) and that our partners may transfer your data to the United States and, if applicable, to further countries. Such transfer involves the risk that authorities may access the data and that your rights may not be enforceable. Please select which Cookies we may use under ”Settings”. More information, particularly about your rights, e.g. to withdraw consent, is available in our Privacy Policy .


Only technically necessary Cookies

Accept everything

Below, you can activate/deactivate the individual technologies that are used on this website.

Accept All


These Cookies make a website usable by providing basic functions such as page navigation, language settings, Cookie preferences and access to protected areas of the website. Cookies in this category additionally ensure that the website complies with the applicable legal requirements and security standards. Owing to the essential nature of these Cookies, you cannot prevent their use on our website. Details about these Cookies are available under 'More information'.

Functionality and personalization

These Cookies collect information about your habits when using our web pages and help us to enhance your user experience by tailoring the functions and attractiveness of our web pages based on your previous visits, location and browser settings. They also enable access to integrated third-party tools on our website (e.g., Microsoft Azure for single sign-on authentication). This can involve transferring your data to the United States (for information on the risks involved read Clause 1.5 of our Privacy Policy). If you refuse these Cookies, you might not be able to access the full functionality of the website. Details about the tools we use are available under 'More information'.


These Cookies are used to compile basic usage and user statistics based on how our web pages are used (e.g. via Google Tag Manager, Piwik PRO). If you accept these Cookies, you simultaneously consent to your data being processed and transmitted to the United States by services such as Salesforce Pardot (for information on the risks involved read Clause 1.5 of our Privacy Policy). Details about the tools we use are available under 'More information'.

Marketing and social media

These Cookies help third-party sources collect information about how you share content from our website on social media or provide analytical data about your user behavior when you move between social media platforms or between our social media campaigns and our web pages (e.g., LinkedIn Insights). Marketing Cookies from third-party sources also help us measure the effectiveness of our advertising on other websites (e.g. Google Ads, Microsoft Advertising). We use these Cookies to optimize how we deliver our content to you. The third-party sources and social media platforms we use can transfer your data to the United States (for information on the risks involved read Clause 1.5 of our Privacy Policy). If you accept these Cookies, you simultaneously consent to your data being transferred and processed as described above. Details about the tools we use and our social media presence are available under 'More information'.

More information

Save Settings

Dürr opening up new environmental technology business field for ventilation air methane (VAM)

Exhaust air purification systems for coal mines

Bietigheim-Bissingen, October 9, 2012 - Dürr is opening up a new environmental technology business field with a growing market potential. With its VAM RTO exhaust air purification systems, the company is helping to minimize emissions of environmentally harmful methane from coal mines. Methane is the second most frequent greenhouse gas after CO2, though it is significantly more environmentally harmful than CO2. To date, Dürr has received two orders from China and the US for its technology which is used to burn the methane in the ventilation air from mines. Operators can use the waste heat from this process to generate electricity cost-effectively. Experts believe that this technology has great potential in the most important coal producing nations: China, USA, India and Australia.

Methane gas contained in the coal seams is released during the underground mining of coal. To avoid explosions, the pits are constantly ventilated. The methane-containing waste air expelled by the ventilation system is generally discharged untreated into the atmosphere. Although this is still permissible today in most countries, methane emissions contribute around 21 times more to global warming than the same volume of CO2.

The VAM RTO technology developed by Dürr permits the methane to be dealt with sustainably and cost-effectively. The regenerative thermal oxidation process (VAM RTO), in which the gas is burned at approx. 1,000 degrees Celsius, significantly reduces emissions. If a steam turbine is connected, electricity can be generated for use in the mine or for feeding into the grid. In many countries proceeds can also be generated from emissions certificates.

In the province of Shanxi, the largest area of coal reserves in China, Dürr recently won a VAM RTO order to the value of more than € 10 million. Dürr is to install twelve RTO modules for the disposal of ventilation air methane in the Gao He mine by March 2013.

The company had already received a smaller order from the US last year. Dürr supplied three RTO modules for a coal mine in West Virginia which are enabling some 320,000 tonnes of CO2 equivalent to be scrubbed annually.

According to Ralph Heuwing, CFO and the member of the Dürr AG Board of Management with responsibility for the Clean Technology Systems division: "The increasing importance of environmental protection and energy efficiency is creating new markets for proven Dürr technologies. Our VAM RTOs mean that we can be part of this trend and generate further growth in the Clean Technology Systems division. In the next few years we anticipate a large number of new orders for VAM scrubbing systems".

The greatest potential exists in China where coal plays a substantial role in meeting the growing energy demand. At the same time, the country is increasingly intent on ensuring that its economic growth is sustainable. According to the current five-year plan, pollutant emissions are to be reduced by 16 to 17%. To achieve this, investment in sustainable technologies is being promoted more strongly.