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When selecting equipment, it is necessary to take into account various factors such as reliability, safety, cost-effectiveness, technical performance, corrosion resistance, completeness as a set, productivity, energy efficiency, maintainability, and environmental friendliness. One must also keep abreast of information on new equipment at home and abroad. When introducing foreign equipment, it is necessary to conduct thorough technical exchanges, seek quotes, make comparisons, and engage in careful negotiations in order to select advanced and suitable equipment. (1) Equipment reliability: refers to the ability to perform specified functions within a specified time and under specified conditions. It represents the degree to which a system or device can perform its designated functions without failures over a specified period of time, under specified operating conditions. (2) Safety of the equipment: refers to the degree to which the equipment ensures safety during production and use. (3) Economic efficiency of the equipment: refers to the total cost incurred over the equipment’s life cycle. (4) Technical nature of the equipment: refers to the characteristics that enable the equipment to meet the requirements of the production process during use. (5) Corrosion resistance of the equipment: It refers to the ability of the equipment itself to prevent corrosion by the medium. (6) Completeness of equipment: refers to the degree of compatibility among various types of equipment as well as between the main machines and auxiliary machines. (7) Productivity of the equipment: Productivity refers to the efficiency with which the equipment operates. When selecting a device, strive to choose one that delivers the maximum output with minimal input. (8) Energy efficiency of the equipment: It refers to the equipment’s performance in terms of energy utilization, and is generally expressed as the amount of energy consumed per unit of operating time of the equipment. Such as hourly power consumption, steam (gas) consumption ； It is also expressed in terms of energy consumption per unit of product, such as the electricity consumption per ton of synthetic ammonia. (9) Equipment maintainability: also known as repairability or ease of repair. It directly affects the workload and costs associated with equipment maintenance and repair. Equipment with good repairability generally features a simple structure, a rational combination of components, components that can be easily removed and installed during repairs, ease of inspection and operation, a high degree of standardization and versatility, as well as an ample supply of replacement parts. (10) Environmental friendliness of the equipment: refers to the degree of environmental pollution caused by the equipment’s noise, leaks, or emission of harmful substances. When selecting equipment, it is necessary to keep noise levels within standard ranges, eliminate any leakage points, and install treatment facilities for the exhaust gases, waste residues, and wastewater generated.