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Company-owned thermal power plants in salt water accidents and prevention of steam turbine


Priming, there may be full of water and steam boilers with water accident. When some water is with some people and superheater, the steam temperature will make a new dump, there will be some serious,[link widoczny dla zalogowanych], others were brought in boiler water turbine. In addition, after the shutdown boiler, superheater in storage, in the furnace rose too fast, water is not fully evaporated, with the new steam into the turbine. 2.2 Gland Steam Seal Heater water heater burst damage, boiler feed water leakage were steam side, leakage is large, the normal drainage system of thinning out too late, that is full of water caused by the exhaust pipe Po Shun person steam turbine seal, Although the extraction check valve is closed, and can only flow back to prevent a large number of soft drinks, and can not prevent water leakage into the cylinder. 2.3 exhaust pipe design of water by pipeline, in the exhaust pipe, exhaust chambers, drainage pipes should be arranged, the wind riding water. In practice, due to lack of extraction pipe slope, and even anti-loaded slope, resulting in hydrophobic point is not low, causing water extraction tube, exhaust pipe water under normal circumstances, but generally does not return within the steam turbine load suddenly small, the cylinder pressure decreases, water vapor at the same time to return the cylinder. 2.4 The balance of the Balance deaerator steam damage to the deaerator heater is mixed, a large steam room, plus the water tank used as boiler feed water, a large number of saturated water, medium pressure steam turbine steam seal deaerator section of steam leakage and associated steam flat tube, in case they stop or significantly reduce the load could cause the steam from the deaerator steam turbine balance pipe back person, while oxygen saturation water vapor pressure decreased as the top, so that back section water vapor increases, damage to the turbine shaft seal. 2.5 Turbine drainage drainage pipe down by the low pressure turbine power within the machine, sometimes to improve the speed of heating pipe, increasing the hydrophobic emissions, resulting in a large number of hydrophobic flash tank vapor line of people. The flash tank and pipes have a certain critical flow rate, when the hydrophobic emissions increases, bound to make the flash tank and piping pressure increases, causing high drainage drainage pipe back through the low back machine. Hydrophobic 2,6 into the steam pipe diameter less than the drainage pipe, and sometimes in the design that is used for the hydrophobic, while ignoring the role of heating pipes, the design is too small, resulting in warm-up when the temperature rises slowly into the steam pipe, especially in the winter, this time If you try to boot, will surely have an accident with water into steam. Timely processing, such as open drainage and reduce the load of an emergency stop to avoid such accidents or incidents to expand. 3.11 a sign of a sudden drop in steam temperature steam pipe steam temperature suddenly dropped, or the steam temperature continued to decline rapidly, if not reduced to the minimum allowed value, but has indicated that people with cold water, gas or steam pipe. 3.1.2 flange, behind closed doors when the steam leakage and cool water into the pipeline, due to the cooling various parts of this uneven shrinkage uneven sealing surface generation gap, there Po gas phenomenon. 3.13 Impact sound of water pipe when the pipe water into the water will flow with the steam at high speed in the corners, turn the flow of the water quality of larger,[link widoczny dla zalogowanych], higher speed will hit pipelines, production sound of water hammer, water pipes at this time serious, depending on the location of its place in time for processing. 314 Seal and cool to take the white steam into the cylinder when after the turbine shaft in place, the obvious uneven cooling, there gland steam leakage increased after the cold steam to seal leaks into the acting is saturated water vapor , contains large amounts of water droplets in the steam leakage, so the risk from motor shaft seal, this time is that Ling has entered the steam turbine must be promptly hydrophobic,[link widoczny dla zalogowanych], reducing the load, or even an emergency stop. 3,[link widoczny dla zalogowanych],2 surveillance and prevention device set to help early detection of persons running into the air, water signs, to prevent accidents, some of the key parts in the additional monitoring devices and to prevent the device. Installed in the inlet steam pipe temperature alarm device; in the horizontal pipe wall temperature difference between the upper and lower alarm device is installed; in the extraction pipe, such as steam turbine and steam seal heater, and the oxygen tank connected in series double extraction pipe installation valve. Concentration of 3,3 to improve the drainage system drain tank for the drainage pipe, according to order of high and low pressure, high pressure expansion device installed in the most remote, low pressure hydrophobic in the last end; drainage pipe received a hydrophobic header, to avoid vertical to enter, preferably 45 post header axis j; associated box flow cross-sectional area should be large enough,[link widoczny dla zalogowanych], generally the flow cross-section of drainage pipe and the lO-fold; drainage pipe installed in the pipeline should be the lowest, so that pipes smooth water flow, drainage pipe layout to avoid unreasonable because the water caused the accident water accident prevention 3
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[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]

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