Replacement of the pumping ejector in the water-ring vacuum pump of the flash evaporation system
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This post was last edited by Peach blossoms are in bloom on 2016-2-24 at 15:38. The heat exchangers in the flash evaporation system are prone to internal leakage, and the ammonia nitrogen level in the flash condensate is too high. To meet the requirements for water balance and environmental protection, most of our high-flash vapor is vented after being equipped with silencers. The six vacuum pumps have a high failure rate, and the main reason is the large pressure fluctuations in the flash system, which cause surging in the vacuum pumps and the breakdown of their rotor blades. Is it possible to install a jet extraction steam unit in the DN250 high-flash vent steam pipeline? By utilizing this energy before venting it, energy consumption can be reduced; moreover, converting the moving equipment into stationary equipment will **lower** the failure rate. How high is the feasibility? I’ve done my own estimation; let’s see if there are any better suggestions from the group members 1. Install a 6,000-length ejector directly on the existing DN250 vent line, with the side extraction port connected to a DN150 exhaust pipe and the vacuum pump inlet manifold. The high flash vapor pressure is around 0.9 MPa, and the quantity is about 100 tons. 2. The planned installation location for the extraction unit is 100 meters away from the discharge point; by installing just one extraction unit without enlarging the pipeline used for discharge, will the effectiveness be limited? 3. Is it necessary to add a tee at the discharge port behind the injector, with a DN250 vent line, to ensure adequate venting?
Using a injector certainly results in a much lower failure rate compared to a liquid ring pump. This is especially true in situations where the inlet pressure fluctuates frequently and significantly, such as in the injectors of Rumus propane dehydrogenation reactors, where the absolute pressure varies between 1.4 and 0.5 bar over a period of 100 seconds or so； However, with a injector, there are also significant problems with vibration and noise!
Compared to liquid ring pumps, the noise and vibration levels of ejectors are already very low. Moreover, ejectors are static devices that can operate continuously once they are successfully commissioned; they can be treated as pipe fittings and basically require no maintenance.