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1. Optimize the process flow: Employ pre-furnace hydrogen mixing technology to improve the heat transfer efficiency, reduce the number of heat exchange units, and lower the system pressure drop. In the reaction system, a high-pressure separator process is used to reduce the cooling load on the by-products as well as the heating load on the distillation system. 2. Use high-performance catalysts: The thermal properties of the catalyst determine factors such as the reaction pressure, reaction temperature, hydrogen consumption, and reaction heat during the hydrogenation process. III. Make full and rational use of reaction heat. The hydrogenation process generates a large amount of reaction heat; by optimizing the heat exchange process and fully recovering this heat to be used for heating the feed, hydrogen, and the feed to downstream distillation systems or to generate steam, the consumption of cooling and heating utilities can be minimized. This is key to energy savings in hydrogenation units. IV. Use of efficient equipment: 1. U-tube double-pass heat exchangers that utilize counterflow heat transfer, eliminating the need for a temperature difference correction factor. Its advantages are: high heat transfer efficiency, making it more suitable for heat transfer processes with small temperature differences. In addition to enabling greater heat recovery, it results in a lower pressure drop in the reaction system compared to using multiple single-pass heat exchangers in series, thereby reducing the compression energy consumption of the circulation pump. 2. Use energy-efficient motors, especially large-scale energy-saving motors. 3. Make use of high-efficiency oil pumps wherever possible. 4. Adopt a reaction feeding heating furnace with horizontal tubes and double-sided radiation; the furnace tubes in this type of furnace receive radiation from both sides, resulting in an average heat intensity that is 1.5 times greater than that of cylindrical furnaces. This allows for a reduction in the heating area and the total length of the furnace tubes, as well as a decrease in the number of elbows. As a result, the pressure drop across the furnace tubes is significantly reduced, thereby lowering the energy consumption required to drive the compressor. In such double-sided radiant heating furnaces, high-pressure furnace tubes are generally not installed in the convection chamber; instead, other process fluids can be used there to absorb heat (such as for preheating oils, or to generate steam from air or hydrogen). The overall efficiency of such furnaces can reach 90%. 5. Energy recovery: In large-scale hydrogenation plants, hydraulic turbines are used to recover the pressure energy of the process fluids that are discharged from the high-pressure separator to the low-pressure separator, and this energy is then used to drive the reaction feed pumps; approximately 60% of the energy can be recovered in this way. 6. Recycling of low-temperature heat: A large portion of the high-quality energy generated during the production process is converted into low-quality (low-temperature) energy, which is released into the environment in various forms and thus lost. These low-temperature heat sources include: (1) the heat from oils at temperatures below 150–200°C, which is discharged into the environment through cooling; (2) the condensed water resulting from the condensation of waste steam at pressures below 0.3 Mpa, which is also released into the environment; (3) the flue gases from heating furnaces at temperatures below 400°C, which are emitted into the atmosphere. If the heat from streams at temperatures below 100°C can be recovered, the energy consumption of the facility can be reduced by 10%–20%. This post was last edited by Zhenzhen Youci on 2009-4-16 at 16:48.]