Improvement Measures for Water Level Measurement of Condenser of Thermal Power Generating Sets

Abstract: The information on the improvement measures for the water level measurement of the condenser of the thermal power generation unit is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. The general principle of container water level measurement is shown in Figure 1. There are the following differential pressure calculation formulas: △P=P+P-=(P2+H1g)-(P1+Hg) where △P is the differential pressure transmitter measurement The obtained differential pressure value is the density of water at a certain temperature and pressure, and g is the acceleration of gravity. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the improvement measures for the water level measurement of the condenser of thermal power generating units. 1. The general principle of container water level measurement is shown in Figure 1. There is the following differential pressure calculation formula: △P=P+—P-= (P2+ρH1g)-(P1+ρHg) where △P is the differential pressure value measured by the differential pressure transmitter,ρis the density of water at a certain temperature and pressure, g is the acceleration of gravity, P1 and P2 are the space pressures on the negative pressure side and the positive pressure side, respectively, H is the height of the actual water level in the container, and H1 is the height of the reference water column. After the container and its pipeline are formed, H1 is fixed, and the space pressures of P1 and P2 are equal as long as they are always connected, so the above differential pressure calculation formula can be transformed into: P=ρg(H1-H) where △P can be measured by a differential pressure transmitter,ρ, g and H1 are all known numbers, and the H value, which is the actual water level of the container, can be easily calculated using modern computer technology. 2. Problems existing in traditional measurement methods of condenser water level The condenser water level of thermal power generating units is an important parameter. The traditional condenser water level measurement is shown in Figure 2. Generally, 2 sets of such water level measurement systems are designed and installed. Each water level measurement system includes 2 primary valves with positive and negative pressure side sampling pipes. 1 water injection valve from the outlet of the condensate pump, 2 secondary valves and 1 balance valve in the three-valve group, 2 blowdown valves on the differential pressure transmitter, a total of 8 manual valves, and 2 active valves connector. The two sets of water level measurement systems with mutually redundant configuration often have a large deviation of 100-300mm between each other, which is far from the actual water level indicated by the on-site glass water level gauge. The operator of the operation cannot accurately monitor the water level of the condenser, which affects the safe operation of the unit. Maintenance personnel often maintain or eliminate shortages for a long time, calibrating differential pressure transmitters, injecting water, sewage, and sealing the joint surface of valves and joints with solid oil or various glues. As soon as the vacuum of the device fluctuates or there is a larger vibration in the sampling pipe, etc., all previous efforts will be lost. 3. Reason analysis After actual inspection and theoretical analysis, the main reasons for the problems of the above-mentioned traditional condenser water level measurement are as follows: 3.1 The positive pressure side water seal affects the water level measurement of the condenser water level The positive pressure side sampling pipe sampling port is close to In the condensation area of ​​the condenser, under abnormal operating conditions, the uncondensed steam will enter the horizontal section of the sampling pipe on the positive pressure side. Due to the small diameter (D14×2 or D12×1) Or there are dirt and impurities in the pipe. After the steam in the pipe condenses, it does not flow back to the condenser and forms a water seal in the horizontal section, resulting in measurement deviation and slow change of water level measurement points. 3.2 System leakage affects water level measurement The water injection pipe is drawn from the outlet of the condensate pump, and the pressure is close to 3MPa. As long as the water injection valve has a little internal leakage (it is difficult to judge the small internal leakage), increase the pressure on the positive pressure side or fill the sampling pipe on the positive pressure side. In the horizontal section, the water level measurement will be significantly lower. During the operation of the unit, the condenser is in a vacuum state, and the vacuum reaches more than -90KPa. The traditional measurement system has 8 manual valves and 2 union joints, which often require sewage or water injection. The manual valve is twisted and twisted, and leakage will inevitably occur. The joint surface of any valve or joint, even if it is a very weak leak, The impact on water level measurement is great. 3.3 Vacuum fluctuation affects water level measurement Vacuum fluctuation has a certain influence on the horizontal surface of the positive pressure side. The vacuum rises rapidly in a short time, and the horizontal surface of the positive pressure side tends to decrease. If the pipeline leaks, the impact will be greater. In addition, the loss of steam and water in the thermal system and the thermal expansion of water can also affect the water level measurement. 4. The improvement method and effect are shown in Figure 3. The diameter of the sampling pipe is increased, and D22 is used instead.×3 stainless steel pipes, once the valve is replaced with D20, to eliminate the possibility of water seal formation. The transmitter adopts a differential pressure transmitter with a remote sealing device, which saves 6 valves and 2 live joints, and uses 2 flange diaphragms to sense the upper and lower pressures to form differential pressure. In this way, there is no need for frequent water injection and sewage discharge, which not only prevents leakage, but also greatly reduces the workload of maintenance personnel. Practice has proved that the difference between the two improved water level measurement systems is less than 10mm, and the maximum difference from the local water level gauge is less than 30mm, and it has been stable and reliable, meeting the technical requirements of condenser water level measurement, and the effect is very good. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Improvement Measures for Water Level Measurement of Condenser of Thermal Power Generating Sets'

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