The reason why the vacuum in the condenser rises and the exhaust pressure of the steam turbine decre

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There is a situation that can cause the vacuum to rise, and the exhaust temperature also increases, that is, when the low-pressure extraction pipe of the unit leaks. The specific performance is as follows: the load of the unit is reduced, the vacuum of the condenser is also reduced, and the load of the unit is increased, and the vacuum of the condenser is also increased.

The reason is: when the load of the unit is reduced to a certain value, the relative pressure of the low-pressure extraction pipeline will be negative pressure, if the pipeline leaks, then the leakage will affect the condenser vacuum, when the load of the unit rises to a certain value, the relative pressure of the low-pressure extraction pipeline increases, the phenomenon of air suction disappears, and the leakage of the pipeline leaks steam outward. Therefore, when the load of the unit increases, the vacuum rises, but because the exhaust volume of the steam turbine increases, and the temperature and flow rate of the cooling water of the condenser remain unchanged, when the air leakage phenomenon of the low-pressure pipeline disappears (the vacuum degree of the condenser does not rise) and the load of the unit continues to rise, it is possible that the vacuum of the condenser rises and the exhaust temperature also increases.

The discharge pressure decreases and the vacuum naturally rises. The reasons for the increase in vacuum are as follows:

1. The circulating water volume of the condenser increases.

2. The copper pipe of the condenser used to be dirty, but now it is clean.

3. The leakage point of the vacuum system is eliminated.

4. Add a vacuum pump or water jet pump.

5. The load of the unit is reduced.

6. The original shaft seal pressure was low, but now it has been increased.

Summary. Regarding the difference between the steam turbine and the condenser of the power plant, what is the difference between the exhaust pressure, back pressure, vacuum, and vacuum degree.

Hello dear, exhaust pressure: the residual pressure of steam after the steam turbine has done work.

Back pressure: that is, the exhaust pressure of the steam turbine, which refers to the steam with a certain pressure and temperature after the work is done in the low-pressure cylinder, and then discharged into the condenser;

Vacuum: When the pressure in the container is lower than the atmospheric pressure, the part below the atmospheric pressure is called vacuum, and the pressure in the container is called absolute pressure, which can be expressed in the height of the mercury column.

Vacuum: Vacuum is expressed as a percentage is called vacuum, that is, the height of the vacuum mercury column is divided by the height of the mercury column equivalent to atmospheric pressure, and then converted into a percentage, under the condition that the absolute pressure in the condenser remains unchanged, the vacuum degree changes with the change of atmospheric pressure. Therefore, it is better to use absolute pressure to represent the vacuum in the steam turbine condenser in the theoretical calculation.

Regarding the difference between the steam turbine and the condenser of the power plant, what is the difference between the exhaust pressure, back pressure, vacuum, and vacuum degree.

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About the steam turbine and condenser of the power plant, what is the difference between the exhaust pressure, the back pressure, the vacuum of the destruction shed, the vacuum degree, the exhaust pressure: the residual pressure of the steam after the steam turbine has done the work. Back pressure:

That is, the exhaust pressure of the steam turbine refers to the steam with a certain pressure and temperature after the work is done in the low-pressure cylinder, and then discharged into the condenser; Vacuum: When the pressure in the container is lower than the atmospheric pressure, the part below the atmospheric pressure is called the vacuum, and the pressure in the container is called the absolute pressure, which can be expressed by the height of the mercury column. Vacuum:

Vacuum is expressed as a percentage is called vacuum, that is, the height of the vacuum mercury column is divided by the height of the mercury column equivalent to atmospheric pressure, and then converted into a percentage, and the vacuum degree changes with the change of atmospheric pressure under the condition that the absolute pressure in the condenser remains unchanged. Therefore, it is more appropriate to use absolute pressure to represent the vacuum in the condenser of the turbine fiber machine in the theoretical calculation. Hope it helps.

It is a heat exchange device that turns the steam discharged after the work of the drive steam turbine into condensate. After the steam has completed an expansion process in the steam turbine, during the condensation process, the exhaust volume of the steam shrinks dramatically, and a high vacuum is formed in the space that was originally filled with steam. The condensate is transported to the boiler through the condensate pump through the feedwater heater and feedwater pump, so as to ensure the continuous progress of the entire thermal cycle.

When the condenser is running, the cooling water enters from the lower part of the front water chamber, enters the rear water chamber through the cooling water pipe (heat exchange tube), turns upward, and then flows through the upper part of the cooling water pipe to the front water chamber, and finally discharges. The low-temperature steam enters through the steam inlet, flows down through the gap between the cooling water pipes, and condenses into water after releasing heat to the pipe wall.

Is it a problem with your meter (temperature and vacuum gauge) to change the meter or correct it, and how about the exhaust temperature?

The condenser vacuum, that is, the back pressure in the condenser, is related to the enthalpy value and flow rate of the exhaust steam of the steam turbine (i.e., the heat load of the condenser), the flow rate of circulating water, and the inlet temperature. The high exhaust temperature of the steam turbine does not determine the vacuum quality of the condenser, but also depends on the exhaust steam flow rate of the steam turbine. If the exhaust volume of the steam turbine is not the maximum and the circulating water flow rate is according to the design parameters, the condenser vacuum should be good.

The exhaust temperature and vacuum are corresponding, on the one hand, there is a problem with the exhaust temperature gauge, on the other hand, there is water in the vacuum transmitter tube, and the display is not accurate.

The 15MW condensing steam turbine is equipped with a 1,000 square condenser, and the vacuum is low due to the lack of gas and the condenser.

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