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 Try using the pressure pump control system in the boiler pressure test inAuthor:匿名 Source by: 本站原創 Published by: 2015年1月26日 Viewed by: 23260 First, the purpose of the experiment:
1, the boiler after the overhaul of the working pressure of hydraulic pressure test, to check the boiler heatingsurface and other pressure parts have no leakage phenomenon; especially the leak valve, pipe weld and repair of large area after the replacement of the boiler heating surface of the boiler, to ensure the quality of maintenance.
2, through the water pressure experiment, test the heating surface after the strength level years of operation,exposed the problem, in the unit cold treated timely, ensure the safe and stable operation of the unit after the start.
Two, the boiler pressure test range:
1, a steam system pressure test range:
1) since the boiler feed water to the boiler plant operation platform at the end of the extending section over the export pipeline plugging valve comprises an economizer, concentrated descending tubes, water wall, steam water separator, water tank, roof superheater, wall enclosure superheater, partition wall superheater, low temperature superheater, screen type superheater, the last stage superheater, end over the export of extension pipeline etc..
2) boiler pipe of a door, including the air pipes, drainage pipes, sewage pipes, the sampling tube, superheater and reheater desuperheating water pipeline to the electric valve, boiler soot blowing steam pipeline operation table firstvalve, pressure meter pipeline from the header tap to etc..
3) safety valve manufacturers to provide special tools to prevent take hydraulic jump.
4) boiler start up system separator, water storage tank and a connecting pipeline, the 380 pipeline, the 381pipeline and boiler water circulating pump pressure blocking plate closure, 382 line, 383 line, 341 line to the water level control electric valve, the valve before the warming pipe and start system of hydrophobic, vent, sampling,water level, pressure measuring point to a door.
2, two steam system (reheater system hydrostatic test range):
1) since plugging the reheat system valve between the hydraulic test of low temperature reheater inlet water pressure test on the extension section block valve to the outlet of high temperature reheater stretch, including low temperature reheater, high temperature reheater and part of reheater desuperheating water pipe etc..
2) two steam system within the drainage water, vent, sampling, pressure line a front pipe.
3) safety valve manufacturers to provide special tools to prevent take hydraulic jump.
3, water pressure test:
The test pressure steam system pressure once for export working pressure 26.15MPa, the test pressure holding time of 20 minutes.
The test pressure steam system pressure two times for working pressure 5.13MPa, the test pressure holding timeof 20 minutes.
(unit: MPa)
The name
The pressure of work
The test pressure
Company
Superheater system
26.15
26.15
MPa
Reheat system
5.13
5.13
MPa
In accordance with the requirements of regulation supervisory pressure container, the # boiler after the overhaulsystem pressure test.
4, boiler water volume:
A steam system of boiler water volume of about 498m3, wherein the economizer system water volume 102m3,restart the system water volume 37m3, water wall system water volume 65m3, 259m3, boiler superheater systemwater volume within the pipeline water volume 35m3.
Boiler steam system two times volume of water 355m3.
Key three, water pressure test inspection:
1, big inline box, guide pipe, a temperature reducer and temperature measuring point weld fillet weld;
2, low temperature superheater, economizer;
3, repair after each change pipe and welding at;
4, the water supply, drainage, attemperating water pipe fillet welding seats etc.;
Wall 5, water wall tube (two rows of suspended smoke deflecting corner site);
After 6, shaft wrapped wall pipe wall at the front (horizontal flue steering office);
Heating surface pipe weld 7, the replacement of the;
8, each bearing the valve packing, self sealing, valve cover, valve is leaking.
Four, water pressure test should have the condition:
1, and water system, too, the work related to reheat system all come to an end or stop, work ticket has end orrecover marched to the value strengths; boost temporary system (booster pump, pipes and meters) has requiredthe installation is complete, and try to turn good, temporary pipeline has been washed, have voted with conditions.The condensing water system, water supply system, water supply system, the main and reheat steam and drain system, auxiliary steam system ended all the work.
Complete replacement of heating surface tube 2, boiler, and the inspection qualification; all repair welding mouthhave nondestructive inspection and examination of qualified;
3, separator safety valve, / reheater safety valve with special hydraulic testing device isolation, superheater of a PCV valve manually before the door closed. Thermal superheated steam, reheat steam flow transmitter, differential pressure water level gauge transmitter isolation. No other parts in hydraulic test must be isolated;
4, steam pipe and inside of bag hanger examination; the chain guide temporary fixation with main steam pipelineconstant, spring hanger at;
All valves 5, steam water system correctly installed in place, through the transmission test, the heating surface tubes or bearing parts on the fin, seals, manhole and thermal monitoring, thermal insulation and outer protectiveplate recovery. Insulation need to check parts have been removed;
The steam water system and participate in 6, around the valve hydraulic test in the boosting process to ensure that no one;
7, a steam system hydrostatic test pressure to final superheater outlet header pressure lists, pressure gauge installed 0-40 Mpa; hydrostatic test pressure reheat steam system in high temperature reheater outlet headerpressure gauge shall prevail, pressure gauge installed 0-10 Mpa, pressure gauge accuracy grade not lower thanlevel 1.5, and qualified after the check; in the course of the experiment on the pressure gauge and the control room should maintain liaison, strengthen local and centralized control contact proofreading.
8, the chemical sampling gate to finish working pressure test after shutdown;
9, the temperature of the water hydraulic test of 21-70 DEG C, the water pressure in the process, the metal wall temperature of not less than 21 DEG C; the temperature of the environment should be more than 5 DEG C.
10, check that the reheater inlet / outlet block valve, superheater outlet block valve has been installed;
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