The function of steam turbine cylinder flange and bolt heating device
The cylinder is heated more easily than the flange, and the heat of the bolt is passed to it by the flange, so the bolt is heated more slowly. For the double cylinder unit, outer cylinder heating cylinder Binet much slower, the outer cylinder flange is heated more slowly, because the flange temperature rises slowly, hampered the cylinder thermal expansion between the rotor and the cylinder caused by excessive expansion, so that the turbine flow dynamic and static clearance is reduced or even disappear, collision moldova.
The cylinder of the high temperature steam turbine should bear high pressure and temperature, and the tightness of the joint surface of the cylinder must be ensured. Therefore, the flange of the cylinder must be made wide and thick.In this way, the starting of the turbine will bring about a certain difficulty, that is, a larger temperature difference along the width of the flange. If the temperature difference is too large, the thermal stress will cause the cylinder to deform or produce cracks. Generally speaking, the cylinder is easier to heat than the flange, and the heat of the bolt is transmitted to it through the flange, so the bolt is heated more slowly.For the double cylinder unit, outer cylinder heating cylinder is much slower than the outer cylinder, the flange is more slowly, because the flange temperature rises slowly, hampered the cylinder thermal expansion between the rotor and the cylinder caused by excessive expansion, so that the turbine flow gap, friction.
The partition plate is used to fix the stationary blade and prevent the steam leakage between the stages. It divides the inner part of the turbine into several pressure segments so that the steam can change the potential energy into kinetic energy through the stator cascade, and then flow the steam into the moving vanes in the prescribed direction.The cylinder of the high temperature steam turbine should bear high pressure and temperature, and the tightness of the joint surface of the cylinder must be ensured. Therefore, the flange of the cylinder must be made wide and thick. In this way, the starting of the turbine will bring about a certain difficulty, that is, a larger temperature difference along the width of the flange. If the temperature difference is too large, the thermal stress will cause the cylinder to deform or produce cracks. Generally speaking, the cylinder is easier to heat than the flange, and the heat of the bolt is transmitted to it through the flange, so the bolt is heated more slowly. For the double cylinder unit, outer cylinder heating cylinder is much slower than the outer cylinder, the flange is more slowly, because the flange temperature rises slowly, hampered the cylinder thermal expansion between the rotor and the cylinder caused by excessive expansion, so that the turbine flow gap, friction.
