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Zhejiang Petrochemical’s multi-nozzle gasifier successfully incorporates coke and operates stably Author/Source: Multi-Nozzle Date: 2020-04-10 Clicks: 19 Recently, the multi-nozzle gasifier in Zhejiang Petrochemical Co., Ltd.’s coal-to-hydrogen plant successfully accepted petroleum coke produced as a by-product of the refining unit; this petroleum coke is characterized by a high carbon content (greater than 90%), a high sulfur content (>20%), and the presence of heavy metal compounds. Carbon, sulfur, and heavy metals – these three elements label petroleum coke as a source of heavy pollutants. The multi-nozzle gasification technology enables the successful blending of such materials in combustion processes and ensures stable operation, thus providing an effective solution to the problem of not allowing petroleum coke to leave the island in Zhejiang Petrochemical’s integrated refining project. As of the time of writing, the three gasifiers in Frame 1 of the project’s multi-nozzle gasification furnace are operating successfully. The #6 gasifier in Frame 2 is being preheated to 1000°C in preparation for use, and the piping work for the oxygen tubes in Gasifiers #4 and #5 is nearing completion. Among them, Unit 1 gasifier achieved successful commissioning with the first feed on November 14, 2019. A shutdown for inspection was planned 21 days after commissioning; after feeding again on December 20, 2019, it operated until a scheduled shutdown for maintenance on March 5, 2020, running for a total of 77 days. Unit 2# gasifier was successfully commissioned for the first time on December 31, 2019, and was scheduled to be shut down for maintenance on April 3; it has been in operation for a total of 95 days to date. The 3# gasification furnace was successfully started for the first time on March 5, 2020, and has been operating stably since then. During operation, the gasifier successfully blended petroleum coke into the fuel, with a maximum blending ratio of 15%. As more gasifiers come online, the proportion of coke used in multi-nozzle gasification will increase further; the designed maximum proportion is 50%. To date, the entire system is operating stably, with all energy and material consumption indicators being better than the design values. The integration of refining and chemical processing at Zhejiang Petrochemical is another successful example following the use of petroleum coke in combustion at Ningbo CICC Petrochemical Co., Ltd. The stable operation under these conditions with coke utilization lays a solid foundation for the application and dissemination of multi-nozzle gasification technology in the industry of integrated refining and chemical processing.