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Ecopure® CAT CCF – Catalytic filter element

Ecopure® CCF ensures high production availability in the glass industry during smog alert

New 3-in-1 exhaust air purification system: taking stock after the first year

Bietigheim-Bissingen, August 20th 2018 – China suffers from massive air pollution. The negative effects are also being felt by many companies in the form of lost sales and faltering growth. This is due to the need to restrict or suspend production while there is a smog alert in effect. To avoid this, the glass manufacturer Libbey has been using the new Ecopure® CCF exhaust air purification system from Dürr in his production plant located close to Beijing for the past year. The powerful system has proven its value; Libbey’s production availability was not affected during frequent smog alerts.

A level 1 smog alert, the highest warning level for severely polluted air, was declared several times over the last year in the Chinese capital. Other provinces have been affected as well. When a smog alert is in effect, the local authorities impose driving bans and high-emission industries need to reduce their production or shut down completely. This also applies to the energy-intensive process of glass production, during which large quantities of pollutants are emitted. The high melting temperatures required to produce glass from various raw materials as well as cullet result in fuel related emission levels of nitrogen oxides (NOx), sulfur oxides (SOx), and dust.

Production 365 days a year

Exhaust air control is an important topic for Libbey, especially from an economic perspective. The American company, one of the world’s leading glassware companies, operates a large plant in Langfang near Beijing. The smelting furnace is designed to run 365 days a year.

Imposed production cuts due to reduced emission limits as shown in Table 1 mean limited throughput and a corresponding lower production volume. A complete production shutdown has an even more severe impact because the furnace has to be kept at a specific operating temperature at all times and the molten glass must be kept moving. Libbey aimed for preventing these negative impacts and subsequently installed a high performance exhaust gas purification technology from Dürr, ensuring reliable compliance with the current emission limits (Figure 1). Additionally, they were interested in having the potential to handle tightened emission limits in the event of smog alerts as shown in Table 1 or even allowing for continuous operation without production cuts.

Dürr Ecopure® CCF system at Libbey in Langfang

Dürr Ecopure® CCF system at Libbey in Langfang

Process comparison of traditional air purification control systems with the Ecopure® CCF technology

Process comparison of traditional air purification control systems with the Ecopure® CCF technology