Shaanxi Yanchang China Coal Yulin plans to gasify dry gas together with coal

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In the production processes of the methanol unit, DCC, DMTO, and the project for the comprehensive utilization of naphtha and light diesel in Shaanxi Yanchang Zhongmei Yulin Energy Chemical Co., Ltd.’s two-phase coal, oil, and gas resource utilization projects, large amounts of dry gas or waste gas are generated as by-products. Some of this dry gas is recovered and used as fuel gas, while another portion is sent to flares; the hydrocarbon resources contained in it are not fully utilized. Shaanxi Yanchang China Coal Yulin plans to feed this by-product dry gas into a multi-feedstock slurry gasification unit, where it will be gasified together with coal to produce syngas. Coal-gas co-gasification was demonstrated in the second-line gasification system of the methanol complex at the China Coal Yulin Fill-in and Completion Project. By modifying the gasification unit, coal and gas are gasified in the same furnace to adjust the components of the effective gas. Upon completion of the technical upgrades, the production capacity for hydrogen will increase by 20,000 m3/h, CO2 emissions will be reduced, while the methanol production volume remains unchanged. A new process burner was added as part of the technical upgrades; the process burner and some pipelines were modified, and a dry gas transmission system was installed. After compression, the dry gas is sent to the upgraded burner, where coal and the dry gas are gasified together to produce syngas. The remaining equipment and pipelines of the gasification unit can make use of existing facilities. The project introduces 100,397.1 tons/year of dry gas for co-gasification. The production processes of the oilfield gas conversion unit and the methanol synthesis unit remain unchanged before and after the technical upgrade. This renovation only affects the gas processing section; the process flows of the other sections remain unchanged from those in the existing plant. The total investment for the project is 60.1083 million yuan. In March 2026, the Shaanxi Provincial Department of Ecology and Environment announced information regarding the technology demonstration project for coal-gas co-gasification to produce syngas at Shaanxi Yanchang China Coal Yulin Energy Chemical Co., Ltd. Status of pilot and scale-up tests for the technical upgrade project: According to the publicly available environmental impact assessment documents, pilot and scale-up tests on coal-gas co-gasification were carried out prior to the technical upgrade. For the pilot test, pure natural gas and water-coal slurry were used as raw materials. The pilot plant uses industrial natural gas with a methane content of about 93% and water-coal slurry as raw materials for gasification. In terms of theory, process design, equipment suitability, and safety and reliability, the system verified the characteristics of synergistic atomization and co-gasification of gaseous and slurry-based raw materials within a four-channel nozzle. This demonstrated the feasibility and advancement of the technology for co-gasifying natural gas with multi-component slurries, providing key technical support for handling dry gas raw materials with more complex compositions.