Steam turbine is one of the three main engines of thermal power plant -- boiler, steam turbine and generator. The body is composed of rotating part and fixed part. The rotating part is composed of impeller, spindle, coupling and blade; The fixed part consists of nozzle, cylinder, steam seal, baffle plate, fastener, bearing and so on.
Turbine fitting blade processing process
In the process of thermal power generation, it is the steam turbine that converts thermal energy into mechanical energy. In the process of power generation, the efficiency and safety of the power plant will be affected by the steam turbine. In the operation of the turbine generator set, after the steam enters the steam turbine, as a result of various impurities carried by the steam into the steam turbine, scaling corrosion will be formed. In particular, the final blade operates under extremely harsh conditions, bearing the joint action of high temperature, high pressure, centrifugal force, steam action, steam excitation force, corrosion and vibration, as well as water droplet erosion in wet steam area. The damage is even more pronounced. And with the increase of the load, due to the superheated steam carrying impurities, more and more serious corrosion, salt accumulation of steam turbine blades, the safe operation and efficiency of the unit is more and more significantly affected.
When the steam turbine starts, if the quality of the superheated steam through the inlet does not meet the required standard, if put into operation at this time, the salt will be dissolved and carried into the steam turbine through the steam, and gradually deposited on the steam turbine blades at all levels, so that the weight of the blade increases, affecting the output of the steam turbine; Salt accumulation imbalance will also cause uneven weight, which is likely to cause vibration. The corrosion of blades under scaling will seriously damage the material and strength of blades, which is easy to cause malignant accidents in the operation of steam turbines.
After running for a period of time, the rotor blade will inevitably produce scaling. This will lead to the reduction of the smoothness of the steam passage, which will reduce the efficiency of the turbine. If the scaling phenomenon is serious, the flow area of the first few stages of the high pressure cylinder will be reduced, which not only affects the turbine economy, but also may affect the axial thrust of the unit, thus endangering the operation safety of the unit. Therefore, every once in a while, the static and static blades of the steam turbine should be descaled and cleaned.
