The closed condensate recovery device of the closed condensate recovery device consists of a water collecting tank, a steam-water separation device, a decontamination device, an anti-cavitation device, a suction and pressure device, a flow guiding device, a high-temperature water pump, a safety valve, and a liquid. The position sensing device, the automatic control cabinet, the pressure gauge, the temperature gauge and the like are composed of the vertical and horizontal types from the structural form to meet different installation spaces.
Features
A \ solves the problem of cavitation when the centrifugal pump is working at high temperature;
B \According to the characteristics of the vapor-water two-phase flow state, the phenomenon of steam resistance, water hammer lock, impact and the like are solved;
C \ can realize common network recovery for condensed water of different pressures;
D \ fully automatic control technology, excellent maintenance-free function.
The component of the closed condensate recovery device solves the problem of cavitation of the electric pump
1. Cavitation generation: The state of the liquid is determined by temperature and pressure. When the liquid is lowered at a certain temperature and the pressure is reduced to the vaporization pressure at the temperature, the liquid generates bubbles. When a liquid containing a large amount of bubbles passes forward through the high pressure zone in the impeller, the high pressure liquid around the bubble causes the bubbles to sharply shrink to break. At the same time that the bubble condenses and ruptures, the liquid particle fills the cavity at a high speed, and at this moment, a strong water hammer is generated, and the metal surface is struck at a high impact frequency, and the impact stress can reach several hundred to several thousand. Atmospheric pressure, the impact frequency can reach tens of thousands of times per second. This phenomenon is called cavitation.
2. The hazard of cavitation: the shock wave transmitted to the impeller and the pump casing when cavitation occurs, and the combined effect of the slightly dissolved oxygen in the liquid on the chemical corrosion of the metal, after a certain time, the surface may have spots and cracks. Even in the form of sea surface, it gradually falls off; when cavitation occurs, noise is emitted, which causes the pump body to vibrate. At the same time, the apparent density of the liquid decreases due to the generation of steam, so the actual flow rate, outlet pressure and efficiency of the liquid decrease. Can result in no liquid output at all.
Overview of the components of a closed condensate recovery unit
The closed condensate recovery unit is a new generation of energy-saving products developed by our company. It has excellent performance against high temperature and cavitation. Compared with the traditional open-type recycling system, it uses a unique supercharging technology to realize the electric pump. The safety protection solves the problem of high-temperature condensate transportation. The constant-pressure suction device carefully designed by the Venturi effect can effectively absorb the secondary flash generated by high-temperature condensate, which not only utilizes heat but also reduces thermal pollution to the environment. , with good economic and social benefits.
The principle of preventing cavitation: To achieve the timely delivery of high-temperature condensate, the primary problem to be solved is the cavitation phenomenon of ordinary centrifugal pumps. The traditional method to solve the cavitation problem is to increase the pouring height of the pump inlet, but this is for on-site construction. This is unrealistic and will bring problems in engineering investment. The device developed by our company skillfully combines the centrifugal pump with the liquid-liquid ejector. An injection boosting circuit is arranged above the inlet and outlet of the centrifugal pump to direct the high-pressure water flow from the centrifugal pump outlet to the pump inlet as the injection workflow. . The two fluids are similar in temperature, and the fluids with different pressures are mixed, and energy exchange occurs. When entering the centrifugal pump, a mixed fluid with a pressure center is formed, and a pressure higher than cavitation is generated at the inlet of the pump, thereby achieving the purpose of preventing cavitation.
The working principle of the components of the closed condensate recovery unit
The condensed water produced by the hot equipment is discharged through the trap and then enters the recovery tank. The separated steam and the secondary flash steam are stored in the upper part of the tank through the steam-water separation device. [When the electric pump is working, it is absorbed by the constant pressure suction device. , together with the condensed water, enters the subsequent process]; the separated condensed water passes through the decontamination device and is stored in the lower part of the tank. The water level in the tank is sensed by a high-precision level sensor and transmitted to the control cabinet. The control system controls the water pump to start or shut down according to the water level. The unique anti-cavitation design can realize the safety protection of the electric pump. The suction and constant pressure device can effectively absorb the secondary flash. The safety valve is designed to ensure that the pressure inside the tank is automatically higher than the set pressure, ensuring the tank. Physical safety.
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