1. Heat transfer performance: the generator condenser, when the cooling tube material by the stainless steel instead of the navy brass, the heat change: heat transfer tube on both sides of the exothermic conditions, that is, both sides of the exothermic form and release The same thermal coefficient, only the heat transfer tube material and wall thickness caused by wall resistance changes, but the wall thickness of the change is relatively small.
2. Tube beam vibration problem: stainless steel material strength and elastic modulus are higher than copper. However, due to the original tube seismic calculation is based on the natural frequency of the tube to avoid the steam turbine speed of 3000 rev / sec caused by the resonance, so that the distance between the partitions is relatively large. And now the tube vibration calculation is based on the United States HEI standard on the prevention of steam flow excitation empirical formula, that is, the steam turbine exhaust to the speed of sound conditions to determine the maximum value of the condenser cooling tube to ensure that the condenser cooling tube does not In the vibration and damage, the calculation results of about 900mm, so the distance from the original condenser partition depends on the need to increase the small partitions.
3. Anti-corrosion ability. Stainless steel is resistant to erosion and corrosion resistance is much better than brass, but austenitic stainless steel on chloride ion corrosion resistance is poor. It can be based on the content of chloride ions in cooling water, select a different
stainless steel tube, when the cooling water chloride ion content can be used less
TP304, TP304L, when the water content of chloride ions can be used when the high TP316L, TP321 and so on.
4. The pipe is connected to the tube sheet. If the tube board with stainless steel composite panels, then the tube and tube plate can be used to expand and seal welding, to ensure that the condenser without leakage, the service life of up to 30 to 40 years, if the single-tube, tube and tube plate with expansion, in order to ensure that the connection does not leak can also be used sealant or tube plate slot.
5. Stainless steel pipe manufacturing process. Stainless steel tube strength and elastic modulus than other materials, especially brass to high, good plasticity, high elongation.
