Dechlorination steam ejector

Some expert, please give some advice! Why isn’t there anyone yet?

Imported pumps draw in chlorine gas and steam from brackish water, and are generally made of titanium.

Are there any other detailed explanations, Huawei? I’d like to hear your insights

It’s just a venturi; nothing special about it.

It’s not very clear; it should be no different from ordinary injectors

This post was last edited by TF123 on 2010-1-12 at 22:35. I’ve seen one that uses external steam. Take a look at this: http://bbs.hcbbs.com/thread-391247-1-1.html. Additionally, when I was studying at an industrial school, I came across the following papers; I thought their content was rather outdated. Title: Application of Steam Jet Vacuum Pumps and Water Ring Vacuum Pumps in Brackish Water Dechlorination Systems. Date: 2009-08-13. Source: Nanning Chemical Co., Ltd. Editor: Wang Lian. Comparison of the actual application of steam jet vacuum pumps and water ring vacuum pumps; Introduction to vacuum pumps used in actual production. In actual production, the first brackish water vacuum dechlorination system installed by Nanning Chemical Co., Ltd. (for a 60,000 t/a ion-exchange membrane caustic soda production facility) utilized one steam jet pump (as shown in Figure 2) and one water ring vacuum pump (as shown in Figure 3), with each serving as a backup for the other. The steam jet pump is specified as L1050, made of titanium, and manufactured by Kimura Kikōki Co., Ltd. in Japan. The water ring vacuum pump is model SKF—12 (I), also made of titanium, and produced by Xi’an Pump and Valve Factory. Later, as part of the expansion, two water ring vacuum pumps were used as the vacuum equipment for the second set of brackish water vacuum dechlorination units (associated with a 90,000 t/a ion-exchange membrane caustic soda plant). The model of these water ring vacuum pumps is SKF—20(I), they are made of titanium, and their manufacturer is Xi’an Pump and Valve Factory. http://www.chvacuum.com/uploads/userup/0908/1321223A2S.gif http://www.chvacuum.com/uploads/userup/0908/132123041600.gif Key factors affecting the performance of steam jet vacuum pumps The advantages of jet vacuum pumps include a simple structure, high pumping capacity, strong adaptability, safe and reliable operation, and no need for maintenance ； Long service life and wear resistance ； Appropriate material selection can provide corrosion resistance ； All materials can be manufactured, hence they have a wide range of applications. The downside is low efficiency, usually below 30%, and high energy consumption. 　　Based on the actual conditions of operation, the factors that primarily affect the performance of steam jet vacuum pumps include steam, cooling water, and nozzles. 　　(1) Steam: The quality of steam mainly includes steam pressure and steam dryness. Both low steam pressure and pressure fluctuations have a significant impact on the performance of steam jet vacuum pumps; therefore, the steam pressure should not be lower than the required operating pressure. However, since the structural design of the vacuum pump used is already fixed, increasing the steam pressure further will not improve the pumping capacity or the level of vacuum achieved. Due to the wide range of steam supply from the boilers in chlor-alkali plants, the steam consumption of various steam-using units fluctuates frequently, which in turn causes fluctuations in steam pressure and affects the proper operation of steam jet vacuum pumps. The dryness of the steam has a significant impact on the performance of vacuum pumps; the water content can cause fluctuations in vacuum pressure, and excessive water content can even prevent the creation of a vacuum. 　　(2) If the supply of cooling water is insufficient, the condenser will heat up, the sound of the airflow will increase, the vacuum level will drop rapidly, and steam may even flow back into the exhaust pipe. It is necessary to ensure that the water supply pressure to the condenser is not less than 0.2 MPa, and the water supply volume should be slightly higher than the rated amount. Furthermore, the higher the temperature of the cooling water, the worse the condensation effect, which results in increased steam consumption and a lower vacuum level; therefore, the temperature of the cooling water also needs to be closely controlled. The impact of cooling water quality on the performance of vacuum pumps is also a factor that cannot be ignored. If the water quality is poor and the hardness is high, it can cause scaling or even blockages in the condenser, severely affecting heat exchange efficiency and making it difficult for steam to condense, thereby impacting the vacuum level. Therefore, softened water is the best choice for circulating cooling water. 　　(3) The nozzle is an important component that affects the performance of vacuum pumps; common problems include incorrect installation, blockage, damage, corrosion, and leakage. On the one hand, when installing steam pipes, residual iron shavings and slag in the pipes can clog the nozzles ； On the other hand, when the vacuum pump system is not in use, the steam pipes are prone to rusting, and as the rust flakes off, it can clog the nozzles. Installing a steam filter before the steam jet vacuum pump can effectively prevent impurities from entering the steam, thus avoiding clogging of the nozzle. Main factors affecting the performance of water ring vacuum pumps Water ring vacuum pumps have a more complex structure compared to steam jet vacuum pumps. However, they are simpler in structure than other types of mechanical vacuum pumps, require lower precision in manufacturing, and are easy to manufacture. Water ring vacuum pumps are simple to operate and easy to maintain ； There are no metal-friction surfaces within the pump chamber, so lubrication of the pump is not required. Sealing between the rotating and stationary components can be achieved directly through a water seal or a mechanical seal. 　　The disadvantages of water ring vacuum pumps are: ① Low efficiency, generally around 35%–40%, with those of better quality reaching around 50%. ②The low vacuum level is due not only to structural constraints but, more importantly, to the saturated vapor pressure of the working fluid. ③It has moving parts, is prone to damage, and requires relatively more maintenance. The main factors affecting the performance of water ring vacuum pumps are moving parts, working fluid temperature, and the circulating working fluid. 　　(1) Moving parts: Since a water ring vacuum pump has moving parts, it is prone to damage ； The dynamic seal of the water ring vacuum pump is prone to leakage, which affects the working vacuum level ； Under normal conditions, the average fault-free operating time of water ring vacuum pumps is over 10,000 hours, which is generally sufficient to meet the requirements of continuous chemical production. 　　(2) Working fluid temperature: The efficiency of a water ring vacuum pump decreases as the temperature of the working fluid rises; efficiency drops sharply when the water temperature exceeds 50°C. By increasing the heat exchange area of the working fluid cooler, it is possible to keep the temperature of the pump body around 35°C, thereby ensuring the stable operation of the water ring vacuum pump. 　　(3) Circulating working fluid: A water ring vacuum pump is a type of liquid ring pump that uses water as its circulating working fluid. Using water as the circulating working fluid has many advantages, such as low cost, easy availability, and no environmental pollution. However, it has one major drawback: due to the high saturated vapor pressure of water, the suction pressure of water ring vacuum pumps is also high. Economic comparison between steam jet vacuum pumps and water ring vacuum pumps Both steam jet vacuum pumps and water ring vacuum pumps can meet the production requirements for brine dechlorination from a technical standpoint. The following table presents an economic analysis and comparison using Nanning Chemical Co., Ltd.’s 60,000 t/a brine dechlorination plant as an example. The details are shown in the table below. The scope of comparison includes the vacuum pump and its associated components such as heat exchangers. As can be seen from the table, the initial investment in steam jet vacuum pumps and water ring vacuum pumps is not very different; however, the operating cost is 720,000 yuan per year for steam jet vacuum pumps and 180,000 yuan per year for water ring vacuum pumps. In terms of economic efficiency, the water ring vacuum pump is superior. http://www.chvacuum.com/uploads/userup/0908/1321233133D.gif Conclusion: Steam jet vacuum pumps and water ring vacuum pumps each have their own advantages and disadvantages in terms of technology. Steam jet vacuum pumps have a high pumping capacity, can create a vacuum quickly, feature a simple structure, offer reliable and stable performance, are safe to operate, are easy to maintain, and can be considered “maintenance-free devices,” thus saving on costs related to spare parts and maintenance labor ； Its drawback is high energy consumption, and fluctuations in steam quality and cooling water volume can easily lead to a decrease in the vacuum pump’s performance. Water ring vacuum pumps do not consume steam, are not affected by fluctuations in steam pressure, maintain a stable working vacuum, are easy to operate, and come as complete systems. However, they have moving parts, require many spare parts, and thus involve relatively more maintenance. From a purely technical perspective, both steam jet vacuum pumps and water ring vacuum pumps can meet the requirements of production. 　　From an economic perspective, the investment differences are minimal, while the operating cost differences are significant. The operating cost of a steam-jet vacuum pump is 720,000 yuan per year, while the operating cost of a water-ring vacuum pump is very low, at 180,000 yuan per year – only 25% of that of the steam-jet vacuum pump. Therefore, from an economic perspective, the water-ring vacuum pump offers greater economic benefits. 　　In summary, water ring vacuum pumps and steam jet vacuum pumps have been successfully used in brackish water dechlorination systems. Both types of pumps can meet the requirements for brackish water dechlorination from a technical standpoint. However, the operating cost of water ring vacuum pumps is relatively low, at only 25% of that of steam jet vacuum pumps. Moreover, they can achieve a stable vacuum level since they are not affected by the quality of the steam, which gives them additional advantages; as a result, more and more organizations are choosing to use them. For these reasons, Nanning Chemical Co., Ltd. abandoned steam jet vacuum pumps in subsequent projects and opted for water ring vacuum pumps as the vacuum equipment in the brackish water dechlorination process.

It’s just an ordinary steam ejector; you can find information about it in any book. The only difference lies in the material used, which determines the type of material and the applications for it. qq1085827423

It’s just a venturi; since wet chlorine gas is drawn in, titanium material must be used.