We use cookies, similar technologies and tracking services

This website uses cookies, similar technologies and tracking services (hereinafter referred to as “Cookies”). These Cookies help to display our website, improve it based on your user behavior (e.g., via Salesforce Pardot) and present content aligned with your interests (e.g., LinkedIn Insights, Google Ads). We require your consent to use Cookies. Additionally, we incorporate content from third-party providers (e.g., Microsoft Azure for single sign-on authentication), which could involve transferring your data to the United States, a non-secure third country. By clicking Accept All, you consent to the use of non-essential Cookies and to your data being transferred to third countries. Clicking Refuse enables you to reject the use of non-essential Cookies. Please select which Cookies we may use under Details. More information, particularly about your rights as a data subject, is available under Details or in our Privacy Policy .

Details

Refuse

Accept

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

Accept All

Essential

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, a non-secure third country. 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.

Analysis

These Cookies are used to compile basic usage and user statistics based on how our web pages are used. 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. 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). 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, a non-secure third country. 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

The ultimate in air pollution control

For one of the biggest RTO systems in the world, Dürr used enormous quantities of steel

The chemical group Yisheng Petrochemical Co., Ltd. has been relying on Dürr air pollution control technology since 2010. However, the latest project at its site in Zhenhai in the city of Ningbo in eastern China is the biggest by a long shot: seven regenerative thermal oxidation (RTO) systems, each with nine towers, purify up to 2.31 million Nm³ of air per hour. Lots of hot air, as befits an RTO system. But that is not enough: to achieve the dimensions for the required capacity, several tons of steel were also used.

Plastic bottles, food packagings, and textiles. Purified terephthalic acid (PTA) is one of the most in-demand starting materials for the most important polymer in the plastics industry. At its Ningbo site, the chemical group Yisheng Petrochemical Co., Ltd. produces lots of it: Just two of the chemical giant’s seven new production lines can produce up to three million tons of PTA annually.

However, the production of the colorless powder results in exhaust air, some of it partially polluted, which presents a special challenge. For this reason, the exhaust air experts from Dürr were entrusted to install Oxi.X RE systems. They are based on regenerative thermal oxidation (RTO) and remove the harmful components generated during PTA production from the exhaust air. This is how Yisheng Petrochemical ensures that no polluted exhaust gases escape into the atmosphere.

Major project for clean air

Dürr supplied seven identical Oxi.X RE RTO systems and a corresponding number of Sorpt.X SW wet scrubbers. Each system consists of a nine-tower Oxi.X RE RTO, a downstream scrubber and a clean gas stack. The treatment capacity of a nine-tower RTO is about 330,000 Nm³/h, rendering the installation in Ningbo/Zhenhai one of the world’s biggest RTO systems with 2.31 million Nm³/h treatment capacity for the seven units.

More steel than the Statue of Liberty

Within a few months, the first four RTO units were installed and have been operating since July 2021. The remaining three units have been in operation since January 2022. A total of 1,340 tons of stainless and carbon steel were used for the RTO units and their ducting, around ten times as much as for the Statue of Liberty. More than 200 poppet valves, over 220,000 pieces of ceramic media, and over 150 kilometers of cable were also used. But the logistical feat paid off: Regenerative thermal oxidizer systems made by Dürr achieve a destruction and removal efficiency (DRE) of nearly 100%. This is necessary to meet the more and more stringent emission standards in China and globally.

Curious? You can find more impressive facts and figures in the video and the infographic (see above).

related articles