Petrochemical industry, which uses oil fractions and natural gas as raw materials to produce organic chemicals, synthetic resins, synthetic fibers and synthetic rubber, often generates large amounts of VOC waste gas during production.
As the main predecessor of PM2.5, VOCs are one of the main causes of the haze. Therefore, the petrochemical industry has become a key sector for the national VOC control.
Picture: https://ecdn6.globalso.com/upload/p/2910/image_other/2025-04/640-2.jpg
In relation to VOC treatment in the petrochemical industry, China has issued a number of standards such as GB31571-2015 “Emission standard of pollutants for the oil chemical industry” and GB 31572-2015 “emission standard for the synthetic resin industry. Or is 97% and emission limits for characteristic organic pollutants in waste gas such as benzene, indicate less than or equally 4 mg/m and acrylic nitril at or just 0.5 mg/m.
In September 2020, the China Petroleum & Chemical Corporation granted the General Manager “Special Action Plan for Ozone Pollution Prevention and Control”, whereby the VOC emission limits for the combustion methods are less or less than 20 mg/m. Some local standards also require the VOC emission limits of 20 mg/m (e.g. petrochemical companies in Beijing, DB11/447 -” -emission standard of air pollutants for petrol enemies and petrochemical industry, which implement the maximum permissible VOCS concentration of measurement aid from measurement concentrations of measurement 20m.
Therefore, the petrochemical industry implements the VOC emission limitation standard of less than or just 20 mg/m
In order to meet the ultra-lower emission requirements for VOCs and specific organic pollutants in the petrochemical industry, the following optimized combinations can achieve strict compliance with industrial emissions standards:
Optimized design of the RTO devices of the rotary valve [https://www.yurcentrto.com/square-rto-with-rotary-valve/]To Improvement of the efficiency of VOC removal
In order to ensure highly efficient VOC removal, the principle of “three TS and one O” must be met:
* Stay time
* Combustion chamber temperature
* Turbulence intensity
* Oxygen content
For rotation valve -rtos [https://www.yurcentrto.com/square-rto-with-rotary-valve/]The optimization focuses on three aspects: dwell time, combustion chamber temperature and turbulence intensity to improve the efficiency of VOC removal.
Based on experience and relevant data, if the stay is greater or equal to 0.75s (as shown in the following illustration), the oxidation chamber temperature can exceed 300 degrees C above the ignition point over 99%.
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Therefore, the design ensures:
* RTO residence of the combustion chamber larger or equal to 1.2s
* Oxidation chamber temperature set at the highest ignition point between combustible components +300 degrees C
* Simulation and optimization of flow and temperature fields in the regenerative oxidation chambers of rotary valves to maximize the treatment capacity and to achieve the cleaning efficiency of more or equal to 99.3%
Software simulation optimization diagrams:
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A. Combustion chamber flow optimization for efficient oxidation burning
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B. regenerative chamber flow and temperature optimization for thorough preheating of waste
Process flow design
1. Emissions of the armored farm and loading area
Properties: Highly concentrated with significant fluctuations in the flow rate and concentration. Direct air dilution would lead to large amounts of waste gas.
Recommended treatment processes:
* “Low-temperature diesel wash + oxygen supplementation + rotary valve RTO”
* “Low temperature condensation + oxygen supplementation + rotary valve RTO”
Case study: A SINOPEC refinery took over the “low temperature diesel wash + oxygen supplementation + rotation flap RTO” process, which means that conforming emissions with NMHC are carried out less than 20 mg/m.
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Process flow diagram
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Project implementation photo:
2. Highly volume process emissions
The organized emission sources in Petrochemical production include:
* PTA production -tail gas
* Acrylnitril production gas gas
* Rubber production gas gas
* PO/SM production tail gas
* Heating gas gas
* Waste gas burning gas gas
* Torch gas
Features: large flow rates, high concentrations and characteristic pollutants.
Due to high concentrations and strict characteristic pollutant requirements, individual treatment in compliance is usually not sufficient. The oxygen correction requirement for security dilution of waste gas makes compliance particularly difficult.
Solution: For high concentration gas: take over:
* “Flue gas recirculation + RTO returning”
* “RTO + RTO” two -stage combustion processes
“Flue gas recirculation + rto veteran” process “
A Petrochina PO/SM system has implemented this process to achieve NMHC less than or just 20 mg/m after oxygen correction.
Picture: https://ecdn6.globalso.com/upload/p/2910/image_other/2025-04/640-5-2.png
Process flow diagram
“RTO + RTO” process
A Petrochina -synthetic resin system took over this process in order to meet NMHC less than or just 20 mg/m and characteristic pollutant emission requirements.
Picture: https://ecdn6.globalso.com/upload/p/2910/image_other/2025-04/640-7-1.png
Process flow diagram
3. Avoidance of oxygen content correction avoidance
In July 2023, the Ministry of Ecology and Environment published a draft of changes in three standards (GB 31570-2015, GB 31571-2015 and GB 31572-2015) and improved the provisions for the correction of oxygen content.
The changes added a second working condition: “For process gases with a high oxygen content (e.g. environmentally collected gases, which the ambient air level approaches that meet the requirements for the combustion oxygen), no additional air supplement is required.” In this working condition, the actual measured concentration is used as the basis for compliance with compliance, and no conversion of the oxygen content is required.
To avoid oxygen correction:
* Use for oxygen-free or high concentration gas, which require dilution of less than 25% LEL, the emissions of the factory tanks or the workshop's fugitive emissions.
Media contact
Company name: Xi'an Yangling Yurcent Environmental Technology Co., Ltd.
E -mail: send e -mail [https://www.abnewswire.com/email_contact_us.php?pr=application-of-rotary-valve-rto-in-ultralow-emission-treatment-for-petrochemical-industry]
Land: China
Website: https://www.yurcentretrtot.com/
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