Talking about the Current Development Status and Trends of Foreign Petrochemical Pumps

The degree of standardization of petrochemical pumps in foreign countries can reach 95% or more. Therefore, we must strive to achieve a reasonable combination of product lines under the premise of satisfying the requirements of use. Within a wide range of performance, we can improve the adaptability and versatility of products with the least variety of products. Sex. In addition, with the continuous expansion of the scale of petrochemical production, it is necessary to develop new varieties to meet the needs of petrochemical production, such as 10 million tons of atmospheric and vacuum distillation units, 3 million tons of catalytic cracking units, 2 million tons of hydrogenation units, 900,000 tons of ethylene Crackers, 400,000-ton polyethylene and polypropylene units, and the development of large-scale, high-speed, high-parameter pumps. Also pay more attention to how to improve the life, reliability, and corrosion resistance of pump products. In the past, the petrochemical production plant was operated for one year (8000 hours) and was overhauled once. It now requires 2–3 years for major overhaul to improve the economic efficiency of petrochemicals. Therefore, there must be a great improvement in the performance, structure, quality and reliability of the pump in order to meet the needs of the development of the petrochemical industry.

How large is the demand for pump in petrochemical industry?

The petrochemical industry is an energy industry and a major raw material industry. With the rapid economic development of China, the demand for petroleum and petroleum products such as gasoline, diesel oil, kerosene, and lubricating oil is increasing, and the production of oil and natural gas is used as raw materials. The demand for three major synthetic materials such as synthetic resins, synthetic rubbers, and synthetic fibers will also greatly increase.

The chemical pump is the largest rotating equipment in the petrochemical production plant. It transports various liquid media such as crude oil, refined oil, chemical raw materials, intermediate products and finished products to other places like the heart's blood. According to statistics, there are more than 1,000 pumps in a medium-sized refinery, of which 83% are centrifugal pumps, 6% are reciprocating pumps, 3% are gear pumps, and the rest are screw pumps and vacuum pumps. A petrochemical plant has more than 2,000 pumps, of which centrifugal pumps account for 45%, gear pumps for 23%, reciprocating pumps and screw pumps for 12%, and shielded pumps for 6%. These pumps are generally driven by motors. The petrochemical pump conveys medium pressure from negative pressure to 300 MPa, temperature from minus 140°C to nearly zero at 500°C, some medium is viscous, some still have solid particles, and most of the transport medium is corrosive. The petrochemical pump is the most energy-consuming equipment. The pump power consumption accounts for about 50% of the total power consumption of the whole plant.

After many years of development, China's petrochemical pumps have relatively complete varieties. In particular, many foreign advanced technologies have been introduced since the reform and opening up. Technical performance and product quality have greatly improved. However, there are still many gaps in the domestic pump compared with foreign countries. First, the standardization, serialization, and generalization of the pumps are poor. Each pump manufacturer has its own series, parts are standardized and interchangeably low, and there is a lack of uniform standards. The product specifications and models cannot meet the needs of petrochemical development. The second is poor quality and reliability, mainly due to the lack of domestic varieties of corrosion-resistant materials or improper material selection and processing accuracy. In addition, the seal life of the pump is low and the variety is small. The life of mechanical seals in foreign countries can generally reach two years or so, and domestic petrochemical pumps have not yet reached this level. Third, the efficiency of the pump is low. Due to the poor hydraulic design of the domestic pump, the machining accuracy is not high, and the pump efficiency is generally 2% to 3% lower than that of foreign countries. Therefore, many chemical process pumps have to be imported from abroad. According to statistics, during the “Ninth Five-Year Plan” period, Petrochemical Group introduced pumps and spare parts from abroad to US$128.64 million.

In recent years, many domestic pump plants imported advanced technology from abroad and produced chemical process pumps in accordance with international standards, which greatly improved the technical level of petrochemical pumps. For example, Dalian Sulzer Pumps and Compressors Company has introduced Sulzer Company's technology from Switzerland. It can produce 43 series of petrochemical pumps with more than 1,000 specifications, with advanced technology and good manufacturing quality. It has been subjected to petrochemical in the two ethylene transformation projects of the petrochemical group. The trust of the enterprise is applied extensively. In addition, products such as the Shanghai Kaishibi Pump Co., Ltd., Zhejiang Jialite Industrial Co., Ltd., Shanghai Nikkeishielded Pump Co., Ltd., and Shenyang Grand Chemical Pump Co., Ltd. have all been widely used in petrochemical enterprises.

In the future, with the continuous development of petrochemical industry technology and scale, the demand for petrochemical pumps will increase. In addition to continuing to increase the quality of conventional pumps and expand the variety of specifications, the demand for pumps for the transport of corrosive materials is increasing, such as ethylene crackers, polyethylene units and polypropylene units in ethylene production; in chemical fiber production PTA device (pure terephthalic acid), polyester device and polyester spinning device, acrylonitrile and fat feeding device. Therefore, efforts should be made to develop corrosion-resistant pump technology. At present, the materials of corrosion-resistant pumps are still largely made of ferrous materials and high-nickel alloy materials. In the future, they are required to use more excellent corrosion-resistant materials such as titanium, zirconium, and hafnium, as well as non-metallic materials such as ceramics, fiberglass, and graphite. .

In order to make the feed of chemical materials in petrochemical production more accurate, petrochemical production uses more metering pumps, and the measurement accuracy is generally around ±0.5%. At present, many pumping plants in China are developing metering pumps. However, most of them have the problem of a small number of specifications, inaccurate metering accuracy, and a short life span. Therefore, in the past few years, petrochemical companies have newly measured and modified ethylene and chemical fiber equipment. The pump is basically imported from abroad. The future development trend of metering pumps is to develop in the direction of high pressure, large flow rate, high metering accuracy and micro metering. Domestic metering pump manufacturers should introduce foreign advanced technologies and develop metering pumps for petrochemical production according to their own characteristics and advantages.

Because the canned pump has the characteristic of absolutely no leakage of liquid material, it is more and more widely used in petrochemical production. The canned pump technology of Germany KSB Company and Japan Nikkiso Co., Ltd. is well-known in the world, and petrochemical enterprises have used more in the past. At present, there are some professional pump factories in China. The selection of shielding sleeves and the design and materials of the bearings are critical, which directly affects the efficiency and life of the shielding pumps. At present, some foreign pump plants use shielded sheath failure alarm technology on canned pumps and are welcomed by petrochemical users. The development trend of canned pumps is toward high vacuum, high pressure, low temperature and large capacity.

The application of high-speed pumps and cryogenic pumps in petrochemical production is also increasing. The speed of high-speed pumps is more than 20,000 rpm. At present, some pump factories in China are doing research and have considerable achievements, but they mainly need to solve serialization and high-speed pump life problems. There is also a rapid development of the cryopump required for transporting and storing liquid natural hydrocarbons in the production of ethylene, and the use temperature is around -40 to -190°C.

At present, domestic design and manufacture of cryogenic pumps at about -40°C are still possible, but cryogenic pumps have yet to be developed.

China's petrochemical industry will have a big development during the 10th Five-Year Plan period. Its production technology and scale will be in line with international standards. Sinopec and PetroChina will invest nearly 100 billion yuan each year, and the demand for petrochemical equipment will be very high. of. Petrochemical pumps are also the most used rotating equipment for petrochemical production, and their performance, quality, and longevity will have a great impact on petrochemical production and construction. The domestic pump industry should speed up the pace of reforms, aim at this largest market, carry out product structural adjustments, and improve the level of technology and management. First, we must improve the standardization, serialization and generalization of products.