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You are here : Double mechanical seal for sealing liquid system reform
The original pump mechanical seal sealing liquid system structure is complex, maintenance and operation and maintenance problems.
1. Because liquid ammonia (concentrated ammonia) has strong volatility, and the media pressure is higher than the pump seal chamber pressure, is a drain seal, when the static and dynamic sealing surface when the liquid ammonia into the volatile and difficult to form an even better can not form a seal liquid, so that the sealing surface is friction, easy to make the inside of the mechanical seal failure, the medium channeling people outside mechanical seal, sealing liquid ammonia tank gradually into ethylene glycol, so that the tank of liquid ammonia concentration , temperature and pressure with the rise, reducing the cooling effect, thus speeding up the mechanical seal damage.
2. Sealing liquid system design complex structures, valves, piping more, but also makes the location of the crowded field, each time when the mechanical seal repair, sealing liquid system in the disassembly will spend a lot of time on.
3. Sealing sealing liquid in the tank after each inspection, all need to press the water and glycol l: 3 ratio were added after preparation, more trouble. And the maintenance of peace process in the device but also to observe the sealing liquid tank level is normal, an increase of inspection maintenance workload.
(4) transformation
1. The first step transformation in 1999, sealing liquid system of the first transformation, will be ethylene glycol directly sealed tank and some pipe removed, the outer fluid seal mechanical seal imports received from desalination of water on the boundary region, while exports directly discharged into the local scene. Desalination of water pressure 0.3 MPa, temperature 40. C or so, in fact, the previous non-pressure mechanical seal flush to the mechanical seal with pressure washing. The sealing surface of the outer mechanical seals to ensure sealing of water in a flow state, is conducive to take the heat, lower the temperature, but also avoid the spill frost problems. Sealed water desalination fewer impurities, ensuring the seal face to be easily damaged, the other, desalination of water is not chlorine ions, for the next step and create the conditions for its recovery.
2. The second step transformation of the structure under the foregoing analysis, the inside of the mechanical seal leakage prone to people outside of a small amount of ammonia mechanical seals, mechanical seals to seal water is taken outside and directly into the scene and have some of the ammonia loss will also cause pollution and impact of on-site safety in production. After sample analysis, exports of seal water content of about 1% of ammonia, each pump seal water flow control at 1 L / min, then the loss of ammonia 4 pumps up 2.4 L / h. So, in April 2005 will receive the seal water return pipe of each pump bodynear the sealed discharge tube, through to the underground tank T-9104, and eventually to ammonia desorption system for recycling. Initially feared would affect the desorption system is running, but the same unit load by comparing the desorption amount FI-9703 and desorption Steam consumption Fl-9702, showed no significant change before and after the show that will not affect the normal operation of the desorption system. After the transformation, as long as the mechanical seal does not leak, even if the inner seal face leakage slightly larger, but also a closed recovery system to ensure the safe operation of pumps.
Although the complex structure of double mechanical seal, but without changing its basic structure of the situation, its subsidiary sealing liquid system for a certain transformation, with good results, after the second transformation, 4 pumps running smoothly , not because of mechanical seal troubleshooting to ensure the stable operation of production facilities.
1. Because liquid ammonia (concentrated ammonia) has strong volatility, and the media pressure is higher than the pump seal chamber pressure, is a drain seal, when the static and dynamic sealing surface when the liquid ammonia into the volatile and difficult to form an even better can not form a seal liquid, so that the sealing surface is friction, easy to make the inside of the mechanical seal failure, the medium channeling people outside mechanical seal, sealing liquid ammonia tank gradually into ethylene glycol, so that the tank of liquid ammonia concentration , temperature and pressure with the rise, reducing the cooling effect, thus speeding up the mechanical seal damage.
2. Sealing liquid system design complex structures, valves, piping more, but also makes the location of the crowded field, each time when the mechanical seal repair, sealing liquid system in the disassembly will spend a lot of time on.
3. Sealing sealing liquid in the tank after each inspection, all need to press the water and glycol l: 3 ratio were added after preparation, more trouble. And the maintenance of peace process in the device but also to observe the sealing liquid tank level is normal, an increase of inspection maintenance workload.
(4) transformation
1. The first step transformation in 1999, sealing liquid system of the first transformation, will be ethylene glycol directly sealed tank and some pipe removed, the outer fluid seal mechanical seal imports received from desalination of water on the boundary region, while exports directly discharged into the local scene. Desalination of water pressure 0.3 MPa, temperature 40. C or so, in fact, the previous non-pressure mechanical seal flush to the mechanical seal with pressure washing. The sealing surface of the outer mechanical seals to ensure sealing of water in a flow state, is conducive to take the heat, lower the temperature, but also avoid the spill frost problems. Sealed water desalination fewer impurities, ensuring the seal face to be easily damaged, the other, desalination of water is not chlorine ions, for the next step and create the conditions for its recovery.
2. The second step transformation of the structure under the foregoing analysis, the inside of the mechanical seal leakage prone to people outside of a small amount of ammonia mechanical seals, mechanical seals to seal water is taken outside and directly into the scene and have some of the ammonia loss will also cause pollution and impact of on-site safety in production. After sample analysis, exports of seal water content of about 1% of ammonia, each pump seal water flow control at 1 L / min, then the loss of ammonia 4 pumps up 2.4 L / h. So, in April 2005 will receive the seal water return pipe of each pump bodynear the sealed discharge tube, through to the underground tank T-9104, and eventually to ammonia desorption system for recycling. Initially feared would affect the desorption system is running, but the same unit load by comparing the desorption amount FI-9703 and desorption Steam consumption Fl-9702, showed no significant change before and after the show that will not affect the normal operation of the desorption system. After the transformation, as long as the mechanical seal does not leak, even if the inner seal face leakage slightly larger, but also a closed recovery system to ensure the safe operation of pumps.
Although the complex structure of double mechanical seal, but without changing its basic structure of the situation, its subsidiary sealing liquid system for a certain transformation, with good results, after the second transformation, 4 pumps running smoothly , not because of mechanical seal troubleshooting to ensure the stable operation of production facilities.
