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1、广广东东火火电电工工程程总总公公司司印印尼尼棉棉兰兰 2200MW 机机组组工工程程气气力力除除灰灰输输送送系系统统设设备备 GUANGDONGPOWERENGINEERINGCO. PLTU 2 SUMATERAUTARA2200MWMEDAN FLY ASH HANDLINGSYSTEM 操作维护手册 Operation and when boiler being in high load operation, shorten the circle interval time to meet the requirement of the great quantity conveying.
2、4)Ash conveying system operation method when boiler being shutdown： After the boiler and ESP halts, the ESP rapping system should keep operating more than 3 hours. Then the ash temperature starts to fall, its necessary to decrease the pump ash containing and keep the ash conveying system running con
3、tinuously, until ensure that the hopper is cleaned up, then open the ESP man-hole for checking. a) System operation to remove blockage It is necessary to remove blockage when pipe blockage occurs in the conveying as follows: Blockage removing method： A: Stop “run”, start “blow” on the CRT operation
4、menu. When the pipe pressure is high, shut off the air manual valve on the pipeline, open the manual blockage relief valve，discharge ash into the ash hopper by the blockage relief pipe. And carry on “pressuredshut off the air valve after pressure increasingopen the blockage relief valve shut off the
5、 blockage relief valve after pressure starting to fall”，stop the operation until the highest pressure reaches the blowing pressure, then purging system twice finally. B: If the blockage can not be handled with method A, open the manual vent valve of master pump (or other pumps) at higher pressure, w
6、ith this method, take out the ash from the pipe to the pump. Need to closely observe the conveying system condition during the ash conveying. The regular system walk-down will be required while keep monitoring the CRT. Spot walk-down Content： 1.Review the temperature on the adaptors above inlet dome
7、 valve of vessels. Normally, for the first field , the joint temperature is 90100，for the second field temperature , that is 5070，and for the third to the fifth field 28 / 44 ,that is 3050. Review the temperature of this point to check the status of ash falling and ash accumulating in ash hopper. If
8、 the joints temperature in the same field has great difference, it is possible that the ash falling will be uneven or bad ash falling occurs in some hoppers. It is necessary to adjust the load distribution of the flue and ESP, adjust hopper aeration gas quantity and ash feeding time, adjust the circ
9、le interval time, make the ash falling normal and ensure good operation circle. Review all the joint temperature after a period (about a week) of each operation starting. 2.Ash Falling During the period of the “falling conveying conveying over”, know the ash falling and conveying status by knocking
10、the pump body, or check the ash thickness by opening the manual vent valve. This job must be carried out to know the basic ash conveying status especially at the beginning of the conveying and the pump being still not full. 3.Vent-Pipe And Blockage Relief Pipe Status Setting vent-pipe and valves in
11、the MD pump, the vent valve is opened to exhaust when the MD pump inlet dome valve is opened for ash falling by gravity. At the normal condition, it takes 1020 seconds to full the pump, and the ash falling pipe temperature increases and vent-pipe works normally. If there is enough ash in the ESP hop
12、per, but it is still hard to fill the pump, maybe the vent-pipe acts abnormally without enough venting. Here, the following methods can be used: A：Knock the vent-pipe before opening the vent valve; after turning off the vent valve, stop knocking, and repeat the above to remove handicap. B：Clear the
13、accumulated ash in the pipe through the vent-pipe plug. C：Seal the outlet pipe and shut off the isolated valve above the inlet valve, pressurize the pump and pipeline to 12bar, open the vent valve after knocking pipe. And repeat the above. 29 / 44 When the blockage removing goes along well in the bl
14、ockage relief pipe, obvious sound of material flowing can be heard with the temperature rising. 4.The Working Status of the Pump Fluidizing Air Pipe When ash conveying, the pump fluidizing air valve is open, the air flow sound in the fluidizing air pipe can be heard with the libration. The greater g
15、as dosage is, the greaterquiver is; the smaller gas dosage is, the lighter quiver is. If there being no the sound and vibration, it is possible that blockage occurs in the plate and isolated valve caused by impurity. It is necessary to clear the orifice plate and isolated valve and blow the pipe. 5.
16、Conveying Air Avoid more water content in the conveying air. In the dry day, make drainage in air receiver once 2hours, in the wet day, increase the drainage times. 2.Fault Diagnosis And Managing Methods Of Ash Conveying System Warning: Prior to system fault diagnosis, check air & electrical supplies and carry out the protection. When carrying out fault diagnosis, the switch on the CRT menu is set to “stop” or “purge”
