With the time goes on and thermal stress, the valve sealing performance has not a good guarantee, which resulting in the refrigerant within the heat pipe is gradually lost and the vacuum decreased. On the other hand, even if the design of the exhaust needle valve, when in the emissions of not condensable gas, it is difficult to grasp the extent of their emissions, and likely to lead to the degree of vacuum drop.
These sampling results show that the heat exchanger pipe in the work process has complex state, set a exhaust valve is beneficial by the theory. But in fact, the exhaust operating difficulties and the valve seals at a temperature stress are difficult to guarantee the tightness of the role. On the contrary, due to the severe loss of refrigerant and the degree of vacuum decline, the heat transfer efficiency greatly decreased.
The fouling of the boiler heat exchanger is a very serious, these dust come from hot-blast stove checker, condensation or corrosion. The design of the deflector is in order to increase the heat transfer coefficient, narrowing the area of import and export of fluid. Using a horizontal "S" spoiler, so that increase the heat transfer coefficient, but the resistance loss of the system also increasing. Due to the capacity of blower and chimney smoke is noy enough, it will affected the normal burning furnace operation of the hot stove. In summary, the fluid loss of heat pipe, the degree of vacuum decrease and serious fouling are the main reasons of finned heat exchanger loses heat transfer role.
In the production process of heat tube, it can take the tube wall passivation and add corrosion inhibitor to improve heat transfer efficiency. After passivation, the fin is using high-frequency welding wound design, which can avoid fouling. Welded fin has stable performance and eliminating the adverse effects, it can greatly reduce the air thermal resistance of heat pipe.
