Plant high tone shaking and repeated fracture cause analysis and treatment

Abstract: plant high tone shaking and repeated fracture analysis of the causes and treatment of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1. Review zhejiang changxing power plant # 5 machine N125 - Shanghai steam turbine factory production 135/535/535 type ultrahigh pressure, intermediate reheat steam turbine, operating in August 1992 to install. The original # 5 for hydraulic turbine regulating system, speed control system, from may to June in 2001. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a high voltage power plants tone shaking and repeated fracture analysis of the causes and treatment article details. 1. Review zhejiang changxing power plant # 5 machine N125 - Shanghai steam turbine factory production 135/535/535 type ultrahigh pressure, intermediate reheat steam turbine, operating in August 1992 to install. The original # 5 for hydraulic turbine regulating system, speed control system, in May 2001 to June of DEH - using xinhua control engineering company Ⅲ type A high-pressure fuel pure electric resistance adjustable control system on the original speed control system is reformed. Unit control system after modification, automation degree has been greatly improved, the system of the fast response time, high control precision. But from February 2002 to June, # 3 high tone an LVDT altogether five root fracture, in May 2002 in the high tone in the specific location of the sloshing phenomena, a serious threat to the safe operation of the unit. 2. High-voltage shaking tone and # 3 # 5 machine high tone an LVDT fracture is a brief introduction about 22:37 February 2, 2002 points, # 5 machine output of 125 mw, coordinated control, # 3 high tone LVDT2 signal by 0 v jumped to 4. 04 vzui great value, high VCC card, 4. 04 v fault signal is input servo valve compared with the control instruction, servo valve output force quickly close # 3 tone, after load fell to 115 mw, due to the unit there is a deviation between the actual loading and the target, DEH software after operation, in the case of # 3 tone has false open, open the # 4 tone to maintain the target value of load and the balance of the given value. On April 10, 2002, the inspection found that # 3 in the morning tone LVDT1 signal to 0 v, LVDT2 signal is 1. About 4 v, the judgment is # 3 tone LVDT1 signal failure. On May 1, 2002, after # 5 unit when the load fluctuation, shaking tone, especially # 3 tone LVDT2 signal in the control instruction have jump without change. On-site inspection # 3 shaking tone's actual location is larger, and because of # 3 tone LVDT1 censored, for ensure the stable operation of unit # 5 decided to force close # 3 tone, tone in # 3 an LVDT change before, only by the # 1, # 2, # 4 tone to participate in the regulation. 3. High-pressure tone shaking and # 3 # 5 machine high tone an LVDT fracture analysis of the causes for DEH control system, the tone of shaking is a common fault, usually caused by the following reasons: 1. The vibration of the servo valve cause shaking tone; 2. Control parameters do not match, the thermal signal failure; 3. Speed steam every rod vibration; 4. An LVDT feedback servo valve rod pine vibration fault general fatigue of the servo valve oscillation, spring tube, servo valve, magnetic steel, magnetic change filter clogging, servo valve, servo valve opening main valve core jamming caused wear. Because our factory putting-in-service proactively DEH control system time is not long, and our factory more stringent control of the oil ( All the indexes of fire-resistant oil) within the required range The possibility that, should say oil cause is very small. At the same time, we found that the high tone of sloshing phenomena associated with the specific location of # 3 tone. So we focus our check find on other factors, not easily change the servo valve. Thermal control maintenance personnel in the process of fault handling, control parameters and the thermal signal for the inspection, no abnormalities are found. Analysis of # 5 machine when lifting load # 1, # 2 tone, we can find two phenomena: 1. # 1, # 2 high tone of shaking with specific load ( Opening at 48% - - - - - - 50%) About 2. With the opening (# 3 tone 0 - 10%) And the state of an LVDT. We found # 5 on 30 April 2002 machine when lifting load # 1, # 2 tone, on May 5, 2002, at the same time, I found an LVDT # 3 tone of the fracture ( Another long block) , on May 14, 2002 for # 3 tone after an LVDT for replacement, or decreasing the load of haven't appear when the # 1, # 2 tone of sloshing phenomenon. On April 30, 2002 # 1, # 2 tone, occurs in about 100 mw, # 1, # 2 tone opening is approximately 48%, and the opening of 0 - # 3 tone 10%, just in the # 3 tone will open not open stage, the overall tone flow characteristic is at an inflection point, the traffic here change is larger. At the same time because # 3 tone of a an LVDT shielding, and the other an LVDT fracture, at the time of load stability, the two ends of the fracture of the root an LVDT fracture just not release ( In a fragile state of stable) , tone feedback did not change, when adjusted by the unit load, the two ends of the fracture of an LVDT fracture release, # 3 tone caused by the feedback and the actual opening change, the linear relationship between the more aggravated the change of the flow, the system could not be accurate adjustment, the shock caused by shaking caused the tone. When an LVDT coil and core long-term wear falling insulation break, even an LVDT hardcore breaking two head cannot be stable after the contact, in the tone could release at any time, when the tone not only in a particular load ( The opening) Rock, under other load ( The opening) Will happen, it has nothing to do with the tone of the flow characteristics, mainly due to an LVDT feedback is not stable, deviation and DEH computations, in favor of the system of regulating repeatedly, thus formed the tone of the shaking.

If you have a need for coriolis mass flow meter emerson mass flow meter, like , and , you need to be able to find a dependable provider who you can trust when necessary.

Beijing Sincerity Automatic Equipment Co., Ltd’s mission is to provide high quality care and services to our members and to be profitable in the process.

Choose the right platform for selling mass flow meter and we'll reach the right customers. But if we have the right idea in the wrong platform, that still adds up to the wrong idea.