Failure Analysis of Jet Pump

In the steam jet pump , the Laval nozzle has a small throat diameter. Once the foreign matter in the steam pipe enters the Laval nozzle with the steam, it will cause the nozzle to clog and invalidate the jet pump. This is usually the case when new equipment is in operation and steam piping is not clean enough.

Symptoms: After the pump is put into operation, the system vacuum does not increase or decrease.
Level 1 pump, level 2 pump, level 3 pump Laval nozzle extends into the suction chamber deeper, so there is a period between the steam pipe and Laval nozzle air supply pipe. The seal between the Laval nozzle and the air supply tube is generally made of rubber asbestos pad. When the seal is broken by steam, the steam enters the suction chamber through the gap and becomes an additional source of gas, affecting the vacuum.

Symptoms: When the pump is put into operation, not only did not increase the degree of vacuum. But declined.
1-level pump suction pipe indoors as the wall thickness is not enough, the steam pressure will blow the pipe, a lot of steam from the gas pipe into the mixing chamber rupture Department, undermining the vacuum system. In addition to the above-mentioned factors, there is another possibility that due to the gas particles entrained in the high-speed air flow of the previous-stage jet pump, it may impact on the pump of this stage for a long time Trachea, the air supply pipe wall thinning, strength reduction, causing rupture, a large amount of steam to escape, the destruction of the system of vacuum.

Symptoms: When the pump is put into operation, the vacuum not only did not improve, but dropped sharply.
Class 1 pumps, 2 pumps and 3 pumps were zigzag layout. Between the pump and the pump are transitional elbow connection, there is a transition between the 3-stage pump and the main condenser elbow connection, the elbow after a long time the impact of particles in the furnace gas, the impact of the wall thickness of the site will gradually reduce Thin, and finally breakdown, the atmosphere from the breakdown into the vacuum system, thus affecting the system vacuum.

Symptoms: When the system vacuum hovers between 266-399Pa, and other external leaks are all excluded, the above points should be checked.
The same vertical 4-stage pump, 5-stage pump and 6-stage pump also exist in the above cases, and should focus on checking the transition elbow between the pump and the condenser.
Furnace gas in the jet pump suction process, the first by a pump suction chamber into the pump, followed by two pumps and three pumps into the main condenser. However, a part of the furnace gas particles are deposited in the suction chamber of the 2-stage pump and the 3-stage pump. Among them, the accumulation of indoor furnace gas particles by the 3-stage pump is the most serious, and these particles are baked under the action of the high-temperature steam , Will become a high hardness deposits, blocking the pump gas channel, so that the pumping capacity of the pump down. Therefore, 2 pump and 3 pump suction room need to be cleaned regularly.

Symptoms: Time to aspirate to 67 Pa significantly increased.
Fouling occurs inside the diffuser of the 2-stage and 3-stage pumps. When the ash inside the diffuser reaches a certain thickness, the center line of the diffuser will be changed. At this time, the high-speed steam emitted from the Laval nozzle will generate a turbulent flow in the diffuser, thus causing the pump The working characteristics of a marked decline, affecting the pumping performance of the pump.

Symptoms: This level of work can be achieved after the vacuum level and just put into operation compared to the degree of vacuum compared to a significant decline.

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