Constant-pressure expansion system for high-capacity high-temperature hot water

Abstract

The invention provides a constant-pressure expansion system for high-capacity high-temperature hot water. The constant-pressure expansion system is applied to a hot water circulation system and comprises a closed expansion tank, wherein a water seal is arranged on the upper side of the expansion tank, a steam generator used for generating steam in the expansion tank is further connected to the expansion tank, a pressure relief pipeline and a water replenishing pipeline connected with the pressure relief pipeline in parallel are arranged between the expansion tank and the hot water circulation system, a pressure relief valve is arranged on the pressure relief pipeline, and a variable-frequency constant-pressure water replenishing pump is arranged on the water replenishing pipeline. The constant-pressure expansion system can prevent the expansion tank and the hot water circulation system from being corroded.

Description

technical field [0001] The invention relates to a constant-pressure expansion system, in particular to a constant-pressure expansion system for large-capacity high-temperature hot water. Background technique [0002] As we all know, large-capacity high-temperature hot water circulation systems are generally used in water heat storage heating systems. Different from the ordinary hot water circulation system, the heat storage temperature of the large-capacity high-temperature hot water circulation system is greater than 100 degrees, the working temperature is generally 110-150 degrees, and the working pressure is 0.2-0.7MPa. Since there is a large-capacity hot water storage tank in the system, the water capacity of the hot water circulation system is generally 500-2000m 3 , so that the water expansion of the hot water system is very large, and the expansion water can reach 20-100m 3 . Since the bladder-type closed constant-pressure expansion tank can hold a small amount of ...

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Problems solved by technology

Now most of the open water tanks are used as the expansion device, but when a large amount of high-temperature expansion water in the hot water circulation system is discharged into the open water tank, secondary steam will be discharged, causing waste and safety hazards. In addition, due to the heat in the open water tank The contact between water and air will corrode the water tank. When the pressure of the hot water circulation system decreases, the expansion water in contact with the air will be replenished into the hot water system through the replenishment pump, which will also corrode the entire hot water system.

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