Thread Content
1. The steam trap has three main functions: draining water, preventing steam from entering, and removing air. Therefore, in steam systems, steam traps are extremely important as they enable maximum utilization of thermal energy; they represent the most crucial link between steam and condensate systems. 1. The essence of steam is water – gasified water that contains a large amount of heat. In production processes that utilize steam, as the steam passes through heat exchange equipment, the heat exchanger absorbs the latent heat from the steam and transfers this thermal energy to the product. At this point, the steam loses its latent heat and condenses to form condensed water. Condensate, however, does not have the ability to heat objects as quickly as steam; therefore, it must be removed promptly. Otherwise, if the condensate stays inside the equipment, steam cannot enter, which reduces the heat exchange efficiency. As a result, the products cannot be heated. Moreover, condensate can cause corrosion in the heat exchange equipment, so it is necessary to remove it quickly using a drain valve. 2. During transportation, the steam loses some heat due to low ambient temperatures, and a small amount of condensate is also produced. Therefore, it is necessary to install steam traps to ensure that the steam is as dry as possible when it reaches the point of use, thereby preventing water hammer and corrosion and enabling more economical and efficient use of the steam. 3. The initial air in the pipes at startup, along with some of the hot air during operation, can **reduce the heat transfer efficiency of steam** and may also cause an \"air lock\", preventing the products from being heated. Therefore, it is necessary to automatically discharge this air using a drain valve. II. What problems will arise if ordinary valves are used in place of steam traps? In practice, we have seen some users who did not install steam traps; or because the original steam traps were prone to leaking air or getting clogged with water, they removed those steam traps and replaced them with ordinary globe valves or ball valves, sending people to manually drain water on a regular basis ； Some use solenoid valves or pneumatic shut-off valves, with relays to control automatic drainage at set times ； Some directly connect the condensate water to a common recovery tank and pump it back to the boiler room ； Some use pinhole-type steam traps ； For all these reasons, users think that the problems associated with the previous steam traps have been solved, not realizing that this leads to serious steam waste and many other issues. The analysis is as follows: 1. The amount of condensate discharged is controlled by manually adjusting the opening degree of the valve. Theoretically, this is possible; however, it is only suitable for laboratory research and represents an ideal scenario, as the conditions and operating conditions that need to be met are extremely severe. Therefore, in practical application, it is not a real solution. The biggest problem is how to set the valve opening. If it is set to a fixed opening, it cannot be adjusted according to the rate at which condensate is formed. In fact, both the amount and the rate of condensate formation in the same system are not fixed. In terms of equipment, the amount of condensate produced during startup is significantly different from that during normal operation, and fluctuations in the product load during operation also affect the amount of condensate. Similarly, during steam transmission, the amount of condensation is also affected by factors such as outdoor temperature and weather conditions. If the valve opening is increased, steam will leak; if it is decreased, the product heats up slowly. Therefore, these valves cannot be used as substitutes for steam traps. 2. Connecting the condensate water directly to a common recovery tank is an even less advisable method! On the surface, since everything is recovered in a fully closed system with no waste, it seems that there is no loss. In reality, however, when steam leaks into the condensate recovery tank, it gradually condenses, resulting in the loss of the latent heat contained within it. Since latent heat accounts for 70% of the total heat in steam, it is essential to use check valves to prevent steam from escaping into the equipment. In summary: Heat energy systems must use steam traps, and as long as the steam traps are properly selected and their characteristics match their applications, they will function efficiently. Therefore, selecting the right steam trap is an important task for every thermal engineer.