Thread Content
1. What is the function of the air balance pipe of the condensate pump? When there is vacuum inside the condensate pump, it can be discharged to the condenser through the air pipe to ensure the normal operation of the condensate pump. 2. What components make up the turbine itself? The turbine body consists of a stationary part and a rotating part. The stationary parts include cylinders, diaphragms, nozzles, and bearings, while the rotating parts include shafts, impellers, blades, and couplings. In addition, there are also steam seals. 3. What are the indicators of good or poor condenser performance? The operating condition of the condenser is mainly reflected in the following three aspects: 1) Whether it can achieve the most favorable vacuum level. 2) Can the quality of the condensate water be guaranteed to be satisfactory? 3) The subcooling of the condensate water can be kept at a minimum. 4. What are the tasks of condensing equipment? There are mainly two: 1) Establishing and maintaining a vacuum at the turbine’s exhaust port. 2) Condense the exhaust steam that has done work in the turbine, remove oxygen and other non-condensable gases from the condensed water, and recover the working fluid. 5. Briefly describe the working principle of the oil injector in the turbine oil system. When pressurized oil is ejected at high speed through the nozzle, the suction effect of the free jet is utilized to draw oil from the tank through the filter screen into the diffuser tube. After slowing down and increasing pressure in the diffuser tube, the oil is discharged from it at a certain pressure. 6. What are the reasons for water pump vaporization? The reasons for water pump vaporization include too low inlet water pressure or too high water temperature, insufficient water supply due to faulty or clogged inlet valves, too low load on the pump or delayed opening of the recirculation valve at startup, and air leakage into the inlet pipeline or valve components. 7. Why is it necessary to deoxidize boiler feed water? When water comes into contact with air or some gas, a portion of that gas dissolves into the water. The water in boilers also contains a certain amount of gases dissolved in it, among which oxygen is the most harmful. It causes oxidative corrosion to thermal equipment, thereby severely affecting the safe and economical operation of power plants. Furthermore, the gases present in heat exchange equipment also hinder heat transfer and reduce its efficiency; therefore, boiler feed water must be deoxygenated. 8. What is the function of a turbine nozzle? The function of a turbine nozzle is to convert the thermal energy of steam into kinetic energy; in other words, it causes the steam to expand and lose pressure, increasing its flow velocity so that it can be ejected in a certain direction to push the moving blades and generate power. 9. Briefly describe the basic conditions for thermal deaeration. To achieve good deoxygenation results through thermal deoxygenation, the following basic conditions must be met: 1) The water must be heated to its saturated temperature at the corresponding pressure. 2) The gas-removal process must be thorough. 3) Sufficient contact time and contact area between the water and steam must be ensured. 4) The dissolved gases that are removed must be able to be discharged smoothly. 10. What are the rated values of electrical equipment? The rated values of electrical equipment are the normal operating parameters specified by the manufacturers for such equipment, taking into account safety, cost-efficiency, and lifespan as a whole. 11. What is the sequence of low oil pressure interlocks for each oil pump in the lubricating oil system of the steam turbine generator set? The low oil pressure activation sequence of the oil pump is as follows: once the lubricating oil level drops to a certain level, the AC lubricating oil pump is activated, and finally the emergency oil pump (DC lubricating oil pump) is activated. 12. What should be done if it is found that the check valve of the feed water pump is not tight and there is leakage when the pump is stopped? The outlet door should be closed immediately, the oil pump should be kept running, and other effective measures should be taken to prevent the feed water pump from reversing. 13. What are the main components of the turbine lubricating oil supply system? The turbine lubricating oil supply system mainly consists of an oil pump, an oil injector, an auxiliary lubricating oil pump, a jacking oil pump, a cooler, a filter, an oil tank, and strainers. 14. What are the common cleaning methods for condenser cooling water pipes? There are backwashing, mechanical cleaning, dry cleaning, high-pressure flushing, and rubber ball cleaning methods. 15. What are the factors that affect the proper operation of a heater? 1) Scaling on the heating surface; in severe cases, this can cause blockage of the heating tubes, leading to a deterioration in overall heat transfer. 2) Air leaking into the steam side. 3) Malfunctioning of the drain valves or drain control valves. 4) Unreasonable internal design. 5) Leaks in the copper or steel tubes. 6) Imbalanced distribution of steam and water within the heater. 7) Insufficient opening degree or sticking of the steam extraction check valve. 16. What are the causes of cavitation in feedwater pumps? 1) Decrease in pressure inside the deaerator ； 2) The water level in the deaeration tank is too low ； 3) The feed water pump operates for extended periods at low flow rates or under no-load conditions ； 4) The feed pump recirculation valve closes accidentally or is opened too slightly, causing the feed pump to operate in a sealed condition. 17. Why are centrifugal water pumps not allowed to run in reverse? Since the impeller of a centrifugal water pump consists of a set of shaft sleeves with threads that are screwed onto the shaft, and the direction of screwing is opposite to the rotation direction of the shaft, when the pump rotates in the forward direction, these sleeves become tighter and tighter. If the pump rotates in the reverse direction, it is easy for the shaft sleeves to come loose, causing the impeller to become loose and resulting in friction. Furthermore, the head is very low during reversal, to the point where no water can be pumped out. 18. What are the hazards of too high a condenser water level? Too high a condenser water level can cause the condensate to be supercooled. It affects the economic operation of the condenser. If the water level is too high and submerges the copper tubes (at the bottom), it will reduce the total cooling area of the condenser; in severe cases, it will submerge the air tubes as well, causing the pump to draw in water and resulting in a significant drop in the vacuum level of the condenser. 19. What is the purpose of operating the condensate system in stages during unit startup? During unit startup, due to substandard quality of the condensate water, its hardness increases slightly. Sawdust can be added on the inlet side of the circulating water or in the ball cleaning pump’s ball chamber, so that the sawdust adheres to the expanded sections of the copper pipes, thereby blocking the leakage points at those expanded sections.