Corrosion-resistant multi-stage pump conveying medium is corrosive medium, so the most important thing when choosing corrosion-resistant multi-stage pump is to consider corrosion resistance. Commonly used are stainless steel and polytetrafluoroethylene (F46) lining. The anti-corrosion performance of the polyfluoroethylene propylene (F46) lining is better.
The pump body is made of metal shell lining polyfluoroethylene propylene (F46). The pump cover, impeller and bushing are all sintered with metal inserts and fluoroplastics. The shaft seal is made of external bellows mechanical seal. The static ring is 99.9%. (Alumina ceramic or silicon nitride), the moving ring is made of PTFE filling material, which is characterized by superior corrosion resistance and corrosion resistance. The pump is suitable for transporting any concentration of sulfuric acid, hydrochloric acid, acetic acid, hydrofluoric acid, nitric acid, aqua regia, strong acid, strong oxidant, organic solvent, reducing agent and other harsh corrosive medium at any concentration from -20 °C to +105 °C. However, this kind of pump also has great shortcomings, and its main materials are all afraid of high temperature. Therefore, when anti-corrosion is required, high-temperature and corrosion-resistant multi-stage pumps are required.
Stainless steel pump has excellent performances such as anti-corrosion and high temperature resistance. Common stainless steel gear pumps, stainless steel centrifugal pumps, stainless steel rotor pumps, stainless steel screw pumps, etc., can also be equipped with copper wheels and explosion-proof motors to meet explosion-proof requirements according to specific conditions.
Problems that should be noted when improving corrosion-resistant multistage pumps:
1. In the modern chemical production equipment, all the latest chemical production data and information, current working status data and information of chemical equipment can be displayed on the big screen in the production control room, and the chemical industry can be produced according to the production needs. The process is properly adjusted and controlled. According to experience, the early diagnosis of corrosion-resistant multi-stage pump failure and the connection of the corrosion-resistant multi-stage pump working condition monitoring system to the entire chemical equipment are often the focus of maintenance in practical applications, and also the component with the highest maintenance cost; especially in the old type. When chemical equipment is technically modified, it is the most expensive to invest in corrosion-resistant multistage pump monitoring and early failure alarm systems. Modern information technology, such as WLAN network communication and bus communication technology, not only provides technical and economic benefits, but also provides considerable potential for optimization of corrosion-resistant multi-stage pump systems. However, for the existing old-fashioned chemical production equipment equipped with traditional detection and adjustment technology, please consider the appropriate and economical monitoring and diagnosis system.
2. According to the ever-increasing variety and complexity and the increasing number of corrosion-resistant multi-stage pumps suitable for a specific working state. It is conceivable that an integrated, modular, corrosion-resistant multistage pump construction would be a very important structural design. It not only has good technical performance, but also brings good economic benefits.
3. In addition, it is also very meaningful to reduce the throughput of chemical equipment operators to produce initialization data.
It is recommended to replace a large amount of data flow with a suitable data processor. In dealing with the data conversion of corrosion-resistant multi-stage pump systems and chemical production equipment, based on past experience: good cooperation between system suppliers and chemical equipment operators is required. Can corrosion-resistant multi-stage pump systems be used as sensors and regulators? In the chemical industry, users of production equipment often say a buzzword: "Replace the sensor with a corrosion-resistant multistage pump system." Moreover, the "sensor" here not only checks and controls the medium flow when the chemical medium is input; but also as a "sensor", it must monitor the state of the chemical medium and monitor the corresponding work control points. When the physical properties or chemical composition of the chemical medium being transported changes, the operational control status and operating conditions of the chemical equipment should be directly obtained from the sensors integrated on the corrosion-resistant multistage pump casing.
The purpose of this is to minimize the additional monitoring equipment in the chemical equipment. At present, the integration of this corrosion-resistant multi-stage pump system has made some progress: the corrosion-resistant multi-stage pump system has considerable adjustment capability and has become a chemical process regulating component; a large number of powerful and variable speeds for controlling power. Electric drive unit. In addition to high energy efficiency, this variable speed drive system can also adjust the working state of the pump according to the different corrosion-resistant multi-stage pump operating characteristic curves, so that the corrosion-resistant multi-stage pump works with the medium input requirements of chemical equipment. match. However, it is still difficult to achieve the best in the actual production of chemical equipment: to achieve the best match between the complex corrosion-resistant multi-stage pump characteristic curve and the complex chemical equipment characteristic curve. Variable speed drive equipment works well and requires extensive communication and information exchange between corrosion-resistant multi-stage pump manufacturers and chemical equipment users. When planning and developing chemical equipment, it is necessary to start thinking about whether to adopt a variable drive system. Because the variable speed automatic drive is not the best choice in any chemical production process.
