1, Overview Datong second power plant a total installed capacity of 1.2 million kilowatts, equipped with 6 sets of Oriental Boiler Factory, Dongfang Turbine Factory, Dongfang Electric Works 200MW generating units, boilers for the ultra-high pressure natural gas drum in the middle of a cycle The reheated solid state slagging pulverized coal furnace adopts a ball mill and an intermediate storage pulverizing system. The rated evaporation of the boiler is 670t / h, the main steam pressure is 13.7MPa and the main steam temperature is 540 ℃. EHV boilers, of which # 1 and # 2 are DG670 / 140-540 / 540-5 and # 3 to # 6 are DG670 / 140-540 / 540-8. Turbine is a single-shaft ultra-high pressure three-cylinder reheat steam condensing three-steam turbine, generator stator winding water cooling, stator core and rotor hydrogen-cooled. 5,6 units installed in China for the first time introduced the Hungarian-Hella condenser mixed heat indirect cooling system. Each unit of the ball mill, intermediate storage bin milling system points # 1, # 2 two sets of systems, each installed in the system 5 Zhejiang Ryan Instrument Factory production ZSLD pneumatic actuators, since production Has not been put into the automatic adjustment system, the other combustion system to send, the wind damper also used four ZSLD-type pneumatic actuator (some have been using 6DR3101- / 2N locator and 6DR3104-8N valve position device has been modified), since At least 15 years have also been used. On the other hand, due to the replacement of the old spare parts of the three factory of Zhejiang Ruian Instrumentation has been eliminated without production, the newly-produced pneumatic mechanism is not compatible with the old mechanism and upgrade, we use this year # 6 unit overhaul Opportunity to completely revamp pneumatic actuator of milling system. 2, Ruian pneumatic door transformation process The transformation is the use of a box company in Beijing pneumatic actuator, the company for the actual operation of domestic power plants, and Beijing Siemens Corporation to take the production methods, according to provide design and drawings, Selection of foreign companies imported accessories production of a new generation of implementing agencies. With high control accuracy, seismic, dustproof, maintenance-free operation and other characteristics, is ideal for control plant damper and other poor operating environment baffle. After the operation of many other power users, this product proves that the product has reached and surpassed the performance of similar import agencies. 3, after the transformation of the agency's instructions: 3.1, filter pressure regulator: adjust the input pressure to 0.55Mpa air supply, usually every six months with alcohol cleaning time. 3.2, manual / automatic switching valve: (1) normal operation should be cut to an automatic position, the body by the distant electrical signal control. (2) When you need to hand-operated, cut to the manual position, at this time, upper and lower cylinder gas path connected to the positioner gas source is cut off, release the handle on the small lock handle, the handle can be manually operated , Lock the locking screw in place. 3.3, valve positioner (using SIPANS PS2): (1) valve positioner for the two-wire connection, normal work should be maintained at greater than 3.6mA input current. (2) The positive and negative effects of the actuator can be achieved by setting the positioner parameters. (3) Locator initialization is basically automatic. 3.4, Intelligent Locator PS debugging steps: Initialization steps: (1) the manual / automatic switching valve cut to automatic position. (2) Open the gas secondary door. (3) Maintain the input power of the input signal greater than 3.6mA. (4) Turn the positioner to the parameter status and set parameter "1.YFCT" to "turn". (5) Set the positioner to the initial "P" mode. Operate the "+" or "-" key to make the positioner display actuator fully open and the fully closed position between "95%" and "5"%. (If required, adjust the feedback link) (6) Set the parameter "3.INIT" to "Start" and the positioner starts to initialize automatically. There are five steps to automatic initialization. (7) When the positioner displays "FINISH", it indicates that the initialization is completed and returns to the remote operation status, which is the normal working mode. We just configure the following parameters. Parameter Name Function Parameter Value Unit Factory Setting Factory Setting User Setting 1.YFCT Actuator Type - Angle Stroke Actuator - Straight Stroke Actuator - Straight Stroke Actuator Without Sine Wave Correction - Stroke Actuator With NCS - Angle travel actuator with NCS, reverse turn WAY LWAY ncSt - ncSt WAY turn 2.YAGL (1) Rated feedback angle 90 ° 33 33 3. DEBA controller dead zone Auto 0.1 to 10.0% Auto 0.3 4, Actuators per unit of the cooling system uses 6 sets of American Fisher's thin-film valves, including 546-type electrical converter, 657 locator, the use of mechanical parts so far wear and tear, and debug complex, poor linearity. We made a corresponding transformation of a membrane valve, cancel the 546 electrical converter and 657 locator, replace a SITRANS PS2 intelligent electrical valve positioner, connecting the corresponding pipeline, the use of good results, the only flaw is the signal from the off Lock can not be achieved, although the increase of solenoid valve can be solved, but increased control loop and leakage point, is exploring whether there are other options to be resolved. 5, after the completion of the # 6 unit transformation, there has been no pneumatic mechanism defects, but also put into the automatic adjustment system, we can see that the locator is simple, reliable performance, easy to grasp, the use of good results for our plant other 5 Taiwan unit transformation provides a reliable basis. So ready to take advantage of the maintenance opportunities of other units for pneumatic actuator transformation. In view of the advantages of using the positioner, but also for the factory pneumatic valve to provide a viable basis for the transformation. More Keywords Search: Valve
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