China Drying Network News only needs to use the new high-efficiency Fe1-xO-based molten iron catalyst in the existing synthetic ammonia process, and convert it from high pressure synthesis to low pressure synthesis, which can greatly reduce the energy consumption of synthetic ammonia; if the use of synthetic new Technology, energy-saving effect is more significant, is expected to achieve a new breakthrough in low-pressure ammonia synthesis process. This is the information that the reporter learned when he interviewed Professor Liu Huazhang of Zhejiang University of Technology yesterday. Liu Huazhang stated that the direction of energy saving and emission reduction in the domestic synthetic ammonia industry is to reduce the fuel consumption for power supply, that is, to reduce the pressure of synthesis and its power consumption, and the key is the high-efficiency catalyst and its supporting process technologies. The new Fe1-xO based ammonia synthesis catalyst is very active, especially at low pressure. Therefore, with the new high-efficiency catalyst as the core, China’s existing small and medium-sized synthetic ammonia plant with a synthetic loop of 30 megapascals will be transformed into a low-voltage energy-saving plant. The investment will be saved, the production will be quick, and the effect will be good. The domestically designed annual output of 200,000 tons will be used for domestic production. Large-scale ammonia plants, using new high-efficiency catalysts and new low-energy-synthetic ammonia technology, can reduce the synthesis pressure to 10-15 MPa. Simulation tests show that for an ammonia plant with an annual output of 200,000 tons, when the ammonia synthesis pressure is reduced from 30 megapascals to 15 megapascals and 10 megapascals, the energy saving efficiency can reach 12.34% and 18.31%, respectively; Up to 51.34 kilograms and 76.16 kilograms, annual savings of 10,300 tons of standard coal and 15,200 tons of carbon dioxide emission reductions of 23,500 tons and 34,900 tons. The 7.5 megapascal isobaric ammonia synthesis process for the 8.53 MPa residual oil, pulverized coal, or coal-water slurry gasification is particularly significant. At the same time, as the compressor and equipment pressure levels are reduced, the associated costs are reduced, the cost of syngas compressors and equipment at 15 megapascals and 30 megapascals can be saved by 37.2%, and the cost of major equipment for the synthetic loops can be saved by 12.1%. Liu Huazhang’s R&D team based on the experimental study of more than 200 catalyst formulations, adopted the generalized regression neural network (GRNN) model and intelligent calculation method to obtain the optimal catalyst formulation, and developed a new high-efficiency Fe1-xO based ammonia synthesis catalyst. Each catalyst has a new synthetic ammonia process that is suitable for it. For example, the British ICI-AMV low-pressure synthesis process adapted to iron-cobalt catalysts, and the US KAAP new process adapted to ruthenium catalysts. Liu Huazhang pointed out that the problem of high energy consumption of synthetic ammonia in China has not been effectively solved, mainly due to the use of high-pressure synthesis technology, and the pressure and power consumption of the synthesis are huge. Although China has the most advanced ammonia synthesis catalyst in the world, it is used in the relatively backward synthetic ammonia process. There is still no low-pressure ammonia synthesis process that matches the performance of low-pressure and high-activity catalysts, and the development direction of foreign low-energy large-scale ammonia plants One is low pressure ammonia synthesis process. Therefore, the industry needs a new type of catalyst and new process that is matched with low-pressure synthetic ammonia to complete the increasingly urgent task of energy conservation and emission reduction.
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