Questions regarding rotary joints and mechanical seals
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The slag cooler is one of the essential auxiliary devices in circulating fluidized bed boilers; it is used for cooling the slag produced by such boilers. Generally, it is necessary to cool the ash and slag from 900°C to 150°C or even lower. The ash and slag exchange heat with cooling water through the slag cooler, and the circulating cooling water removes most of the heat from them. Once the temperature of the ash and slag has dropped, they can be transported away using specialized equipment or stored in a slag storage tank. With the rapid development of circulating fluidized bed technology, boilers generate large amounts of slag discharge and require high pressure for cooling water. This leads to problems such as leaks at the rotary joints and slag leakage at the slag inlet, which are persistent issues common in this industry. Expert assistance is needed to find solutions to these problems. Most of the rotary joints used in cold slag pumps in operation today employ a packing seal design, that is, carbon fiber packing is used for sealing purposes. Whenever dripping occurs, the bolts on the rotary joint gland are tightened to compress the packing; however, this approach does not yield good results in practice ； Moreover, the slag cooling machine cylinder itself has a coaxiality error, making it impossible for the hollow shaft of the rotating joint to be perfectly coaxial with the housing ； Furthermore, after the rotary joint has been in use for a while, the spindle will sink as the cylinder body sinks. If there are any experts, I earnestly ask for your guidance! For detailed questions, please contact via phone or QQ. Thank you! ! ! !
I think you can attach the drawings so everyone can take a look. This is because the selection and arrangement of seals are closely related to factors such as operating conditions; for example, if attention is not paid to seals, the stiffness of the mixing shaft is insufficient, the stiffness of the supports is inadequate, and the manufacturing precision is poor, then even mechanical seals will get damaged quickly
I think the key is to find ways to improve concentricity; once the centering is good, both mechanical seals and packing seals will perform well.
Since the operating conditions of our equipment are relatively poor and their size is generally large, it is quite difficult to control their concentricity. Do you have any suggestions? Furthermore, packing seals inevitably cause leaks, while mechanical seals have a relatively short lifespan; therefore, it’s difficult to make a decision. I’m wondering if there could be a sealing method that combines packing and mechanical seals
Hello, I am the sales manager at Shengyang Special Sealing Company. Our company is dedicated to the research, development, and production of special dynamic seals, helping customers solve various sealing-related problems. Regarding the question you raised, feel free to call me or add me on WeChat at 15802152501; we can discuss it together. Thank you.