The principle of hoisting boiler heating surface components: after the construction acceptance of the boiler roof beam, the hoisting of the boiler heating surface components can be carried out. General Principles:First up and then down, first on the sides and then in the middle. The center is first and then gradually carried out in front of the furnace, behind the furnace, on the left side of the furnace, and on the right side of the furnace.
Installation of steel structure of power station boiler: 1. Before installation, the high-strength bolts and their connecting pairs are sampled and inspected. Confirm the installation method of high-strength bolt connection points, and the number of temporary bolts and positioning pins meet the requirements of the regulations. 2. Check after the installation of each layer of the frameColumn verticality, girder elevationAnd make a record, and fully confirm the quality of high-strength bolt joints according to the regulations. 3. After the steel structure is installed, it will be retested according to the regulationsColumn verticality, slab beam elevation, deflectionAnd make acceptance records, check the final tension quality of all high-strength bolt connection points.
Boiler seals: boilersEnd of sealingAfter that, the air tightness test of the furnace is carried out, and there is no regulationThe test pressure can be increased by 0 according to the working pressure of the furnace5kpaPerform a positive pressure test, generallyThe wind pressure test value of the negative pressure boiler is selected as 05kpa
Static commissioning and operation of boilers.
Tightness test: boilerBefore the first ignitionSteam drumsThe boiler should be carried out onceSteam drum under working pressureofCompaction hydrostatic testDC boilersIt is advisable to do it onceSuperheater outlet working pressureofTightness test。boilersBefore ignitionThe quality of the water should be qualifiedDemineralized waterAfter the hydrostatic testPressure flushing using the water in the boilerSampling pipes, sewage pipes, drain pipes, and instrumentation lines。(Uncle Cousin Dirty).
Boiler chemical cleaning: power station boiler, evaporation heating surface and furnace front systemBefore startingIt must be carried outChemical cleaning, by having itCleaning qualified units, in accordance with the approved exchange transfusion cleaning plan and measures. After the end of chemical cleaning until the boiler startsTimeIt should not exceed 20dIf it exceeds 20d, it should be taken in accordance with the provisions of the current industry standardFurnace shutdown maintenance protectionMeasure.
Boiler steam pipeline flushing and purging: The temporary piping system of the boiler blowing pipe should be carried out by a unit with design qualifications. InExhaust port mounted muffler。In the boiler blowpipe range;Including:HypothermiaWater pipe systems and boilersOverheatingdevice,ReheatandOverheatingSteam pipe purging. During the blowing process, there should be at least one stop furnace for cooling (more than 12h) to improve the blowing effect.
Boiler trial operation: make the boiler pressurized during the trial operation, the pressure boost should be slow when the boiler starts, the pressure boost speed should be controlled, and at the same time carefully pairedManholes, welds, flangesand other parts are carefully checked. For300MW class and aboveThe boiler should be completed continuously168h full load test operation