The primary commissioning of the slag conveying system in the power plant of Youshen Energy & Chemical’s 500,000-ton/year coal-based ethanol project was successful

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The first-stage commissioning of the slag transfer system in the power station of Yushen Coal-based Ethanol Project, operated by Yan’an Petroleum, was completed successfully. Author/Source: Huahua Network – Coal Chemical Industry. Date: April 20, 2022. Clicks: 13. Recently, the first-stage commissioning of the slag transfer system in the power station of Yushen Coal-based Ethanol Project, with an annual production capacity of 500,000 tons, was successful. Reportedly, the power plant of this project comprises three 260 t/h high-temperature and high-pressure circulating fluidized bed boilers. At the lower rear wall of each boiler, there are four slag discharge ports. The slag falls into the rotary slag cooler under its own gravity and accumulates around the slag inlet pipe. When the accumulation reaches a certain height, the resulting gravitational force balances out the gravitational force of the slag flow within the pipe, thereby blocking the flow. As the drum slag cooler rotates to push the ash and slag toward the discharge end of the drum, the balance is disrupted, and the slag within the tubes continues to flow. By controlling the amount of slag discharged from the outlet of the drum slag cooler, the pressure drop across the bed layer is kept within a reasonable range, ensuring optimal operation of the boiler. The successful initial commissioning of this slag removal system has met the prerequisites for boiler ignition; it has also laid a solid foundation for the smooth trial operation of the project. As of the end of March, the overall progress of this project had reached 96.28%. Currently, the equipment installation is largely completed; the project has entered the final construction phase, and preparations for trial operation are underway. The first boiler is scheduled to be ignited in April. The entire project is expected to be mechanically completed by late June, with trial operation starting in August upon feeding materials. All processes will then be fully integrated, with the goal of achieving full production capacity and meeting all performance standards. The Yushen 500,000 tons per year coal-based ethanol project is currently the largest project in the industrialization of coal-based ethanol technology. With a total investment of 6.98 billion yuan, it is located in the South Area of Qingshui Industrial Park within the Yushen Industrial Park in Yulin City, Shaanxi Province. The project covers an area of 1,365 mu, and it utilizes coal-to-ethanol technology that was jointly developed by Yanchang Petroleum and Dalian Institute of Chemical Physics and for which independent intellectual property rights exist. The project is scheduled to be fully handed over on May 30, 2022. The construction scope includes a methanol complex (devices such as coal unloading and storage facilities, gasification units, shift conversion units, purification units, gas separation units, methanol production units, and sulfur treatment units), an ethanol plant (units including dimethyl ether production, carbonylation processes, hydrogenation processes, separation units, compression systems, heating furnaces, and refrigeration stations), as well as new construction for utility systems and auxiliary facilities; the design capacity is 1.22 million tons of coal to be converted per year. Beijing Petrochemical Engineering Co., Ltd. (BPPEC) has been awarded an EPC contract worth 3.78 billion yuan. The scope of work includes utility facilities and plant-wide system engineering, as well as process units and water treatment systems. BPPEC is also responsible for overall project management services. As the EPC general contractor for the gasification unit of this project, Aerospace Engineering Company signed a general contract with Yushen Energy Chemical Company worth 590 million yuan; the project utilizes two 2,000-ton-class aerospace furnaces.