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The so-called continuous spiral baffle heat exchanger is to cancel the arcuate baffle plate used to control the direction and flow rate of fluid movement in the shell side of the shell-and-tube heat exchanger, replaced by a continuous spiral baffle plate, which is actually called a spiral guide plate. The continuous spiral guide plate in the shell makes the fluid move along a continuous, closed spiral channel with no change in the cross-sectional area of the flow passage, that is, the fluid moves in the whole process of the shell, and the motion trajectory is a stable spiral line. This drastically changes the zigzag reentrant flow regime of the shell-side fluid in the arcuate baffle heat exchanger. This is a revolution in the fluid motion state of the shell and tube heat exchanger shell side. And now
The "Twelfth Five-Year Plan" period is a critical period for my country to strengthen its ability to protect marine rights and interests, realize the transformation of marine economic growth mode and the adjustment of industrial structure, and establish a marine emerging strategic industrial system. Facing the increasingly severe marine rights protection, marine ecological environment protection situation and the huge demand for the development and utilization of marine resources, the marine equipment manufacturing industry will inevitably usher in rapid development, and seawater heat exchange equipment will also usher in a strong demand. However, seawater has a high content of dissolved oxygen, chloride ions and microorganisms, which is very corrosive to metal heat exchangers. So the seawater heat exchanger must solve the problem of corrosion resistance. Lengde company is committed to anti-corrosion heat exchanger
Corrosion problems throughout various sectors and industries, the development of the national economy, human life and social environment have great harm. Due to corrosion, it often causes the shortening of the start-up cycle of the device, the premature scrapping of the device and equipment, the short service life, the pollution of the environment, etc.; at the same time, it will also affect the normal development of new technologies. According to statistics, the annual economic loss caused by corrosion damage in various countries accounts for about 1% to 5% of the GDP of the national economy in that year, which varies with the degree of economic development and the level of corrosion control in different countries. In China, the loss caused by corrosion is particularly serious, according to the "China Corrosion Survey Report" data, China's annual corrosion loss in recent years is about.
At present, large-scale central air-conditioning and low-temperature refrigeration places generally use screw refrigeration main machines, but screw compressors generally use oil injection compression. The exhaust of the compressor will take part of the refrigerating oil out of the compressor. In order to prevent the refrigerating oil of the compressor from entering the system, especially when it is very difficult to return oil to the evaporators of water chillers and low-temperature refrigeration units using full-liquid evaporators, it has a great impact on the heat exchange efficiency of the heat exchanger, therefore, it is necessary to install an oil-gas separator at the exhaust end of the compressor. Although in the prior art, a built-in oil-gas separator is installed inside the compressor, the oil-gas separation is not thorough enough, and there will still be a large number of oil-gas separators.
Shell-and-tube heat exchangers for refrigeration often have accidents in which the refrigeration system is paralyzed and huge economic losses are caused due to the rupture of the heat exchange tube. One of the most common reasons for the rupture of the heat exchange tube is that the water side in the heat exchange tube is frozen and expanded. Generally, the heat exchange tube ice support is damaged in condensers and flooded evaporators, and the heat exchange tube ice pressure is damaged in dry evaporators. The main causes of water icing in the heat exchanger are as follows: 1. The machine is shut down for a long time, and the water is not discharged or not clean. When the ambient temperature is lower than 0 ℃, some water in the heat exchange tube will freeze and expand the heat exchange tube. For
Common air conditioning with water-cooled screw chillers according to the evaporator type is mainly divided into three categories: dry unit, full liquid unit, falling film unit. The core component of the water-cooled screw chiller is the screw compressor. The market is dominated by twin screws, individual manufacturers use single screws, and semi-closed. Individual manufacturers also use open or fully closed type. In addition to large manufacturers such as the United States and Japan, most domestic manufacturers purchase compressors. The system design of dry water-cooled screw chillers of various manufacturers is similar, mainly in the design of heat exchanger and throttle mechanism design. The condenser design of mainstream manufacturers in the market is roughly the same (condensation
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