In the distillation process above the ambient temperature, the heat pump compressor with single heat pump and multi heat pump technology can only operate close to the distillation temperature, because in the ambient temperature, both the distillation products and the intermediate products are liquid, so the heat pump compression can not be carried out.
In the distillation process below the ambient temperature, the situation is more complex. From the perspective of equipment, both cryogenic compression and normal temperature compression are theoretically feasible. The key is to compare the advantages and disadvantages of the two.
In the compression process, the lower the inlet temperature is, the lower the compression power consumption is when the compression amount and compression efficiency are the same. If only so, there is no doubt that cryogenic compression is greatly conducive to room temperature compression! But it's not that simple.
Although the compression under cryogenic condition significantly reduces the compression power consumption, it outputs enthalpy (cooling loss) equal to the compression power consumption to the cryogenic system, and the cooling loss is a negative work! From the perspective of effective energy, the power consumption of normal temperature compression is equal to the power consumption of cryogenic compression plus the effective energy of cooling loss. Therefore, it can be said that cryogenic compression and normal temperature compression are equivalent. Cryogenic compression is not particularly beneficial, and specific problems need to be analyzed.
The advantage of normal temperature compression is that it can reduce the cost of the compressor. Secondly, when the compression ratio is large, it can be compressed in sections to save the compression power consumption. Of course, the disadvantage is also very obvious, that is, compared with the cryogenic compression, it needs to increase the reheating equipment. At the same time, it will also bring forward and reverse resistance, increase the compression ratio and the cooling loss caused by the temperature difference at the hot end of the reheating equipment.
Based on the above advantages and disadvantages, it can be concluded that the larger the compression ratio is, the more suitable it is for reheating room temperature compression, and the smaller the compression ratio is, the more suitable it is for cryogenic compression! Of course, this is only a simple conclusion, and we need to integrate various factors, such as product scheme, to get the right choice.
DEARair separation has a professional technical team to provide customers with high-quality design services in air separation equipment construction projects. Experienced experts and professional engineering design team, to provide users with international standards, national standards and industry standards of engineering design products, including preliminary design, construction drawing design. The company is equipped with international mainstream process simulation, 3D design, stress analysis, safety analysis and other software to provide users with high-quality and advanced design services.
DEAR air separation has many patented technologies, among which ultra-low pressure discharge and energy saving patents are the domestic leading level, which can reduce the energy consumption of air separation plant by 5% - 15%. In the air compression system, the specific performance is: the discharge pressure of the air compressor is reduced from the traditional 0.52mpag to 0.418mpag.
Nearly 20 years of air separation plant manufacturing experience and nearly 10 years of air separation plant operation and maintenance experience have accumulated mature and perfect air separation plant overall operation and maintenance standard process. The intelligent production workshop with huge investment ensures that the product quality is close to zero defects, improves the accuracy of air separation equipment and shortens the scheduled cycle. AI remote intelligent monitoring system can realize remote control, automatic data acquisition and analysis, and achieve early detection and early warning of equipment failure.
