petrochemical production equipment

In the petrochemical production equipment, the pump is the largest amount of rotating equipment, petrochemical pump transport medium with crude oil and refined oil, chemical raw materials and chemical products, water and sewage. According to statistics, a large refinery needs more than 1,000 petrochemical pumps, of which 83% are centrifugal pumps and 6% are reciprocating pumps. The others are gear pumps, screw pumps and vacuum pumps. A large ethylene plant needs a variety of petrochemical pumps amounted to more than 2000 units, of which 45% of centrifugal pumps, gear pumps accounted for 23%, and the remaining reciprocating pumps, screw pumps and shielded pumps. Petrochemical pump petrochemical enterprises is the most energy-consuming equipment, pump power consumption accounts for about 50% of electricity consumption. Petrochemical pump characteristics Petrochemical pump, in addition to the pump with the general performance, the special nature of the transport medium made its harsh requirements. Such as the transmission medium is a lot of flammable, explosive and toxic, requiring the pump has good explosion-proof and tightness. At the same time most of the transmission medium is corrosive, requiring petrochemical pump material selection has good corrosion resistance. Some media are highly viscous and can sometimes cause clogging, so consider the viscous effect on pump performance. Some liquid medium mixed with solid particles, the flow channel is easy to cause erosion and wear, to consider the pump structure and material to reduce the wear rate. Transmission medium temperature range is often very different, the use of temperature from minus 190 degrees Celsius to 500 degrees Celsius, to consider the temperature on the performance of the pump. As the petrochemical industry requires long-term, continuous production, the general requirements of 2 to 3 years a major maintenance, it also requires petrochemical pump reliable operation, long life, the structure is simple, easy maintenance, high efficiency, better overall economic efficiency . International market development trend International petrochemical pump production technology is more mature, specifications and varieties, a high degree of standardization. The main development directions are large-scale, high-speed, mechatronics and pump products complete sets, standardization, serialization and generalization, variety, performance, long life and high reliability, high efficiency, miniaturization, pump seal, Bearing large-scale production and specialization. In recent years, high temperature pump, cryogenic and ultra-low temperature pumps, high-speed pumps, precision metering pumps, corrosion-resistant pumps, conveying viscous medium and medium pump with solid particles, shielding pump products developed rapidly to meet the special needs of petrochemical production. With the refinement of petrochemical industry technology and in-depth processing, the material requirements for petrochemical pumps are getting higher and higher, especially the research and development of corrosion-resistant materials are not only stainless steel and high-nickel alloy materials, Corrosion materials. Petrochemical pump technology research is also progressing with each passing day, such as the study of medium flow in the pump theory, the use of computational fluid dynamics, centrifugal pump impeller internal flow field numerical simulation, analysis of fluid flow characteristics, and pressure and velocity distribution Law, design a reasonable impeller runner to improve the hydraulic efficiency of the impeller. Using the ternary theory to design the pump, the impeller size and the flow velocity distribution in the impeller can be calculated, and the true flow state of the fluid in the impeller can be reflected, and the influence of the viscous fluid on the boundary layer can be considered to improve the pump efficiency.