Graded heat exchange distributed control phase-change heat transfer system and heat transfer method

Abstract

The invention relates to a distributed control phase-change heat transfer system based on graded heat exchange and a heat transfer method. The system comprises a cold source heat exchanger, a heat source heat exchanger, a vapor-liquid heat exchanger and a liquid storage tank. An upper collecting tank of the cold source heat exchanger is communicated with the vapor-liquid heat exchanger through a vapor outlet pipe of the vapor-liquid heat exchanger. A lower collecting tank of the cold source heat exchanger and a lower portion liquid side of the liquid storage tank are respectively communicated with the vapor-liquid heat exchanger through condensation fluid pipes. An upper portion vapor side of the liquid storage tank is communicated with the upper collecting tank of the cold source heat exchanger. The heat source heat exchanger comprises a low-temperature heat source heat exchanger and a high-temperature heat source heat exchanger which are arranged in series. Vapor side communication pipes on the low-temperature heat source heat exchanger and the high-temperature heat source heat exchanger are combined into a vapor pipe to be communicated with a vapor side vapor inlet of the vapor-liquid heat exchanger. A liquid side outlet of the vapor-liquid heat exchanger is communicated with an upper collecting tank of the high-temperature heat source heat exchanger through a liquid outlet pipe of the vapor-liquid heat exchanger. The liquid side outlet of the vapor-liquid heat exchanger passes through the high-temperature heat source heat exchanger and the low-temperature heat source heat exchanger, and then is communicated with an upper portion liquid side of the liquid storage tank through an overflow pipe. The distributed control phase-change heat transfer system is better in effect.

Description

technical field [0001] The invention relates to the technical field of safe and controllable enhanced heat transfer, in particular, the invention relates to a stage-based heat transfer-based split-control phase-change heat system and a heat transfer method. Background technique [0002] In domestic and foreign enhanced heat transfer technologies and technologies dedicated to waste heat recovery and utilization, many high-efficiency phase-change heat transfer technologies have been developed by utilizing the characteristics of high heat transfer coefficient and uniform temperature of vapor condensation and liquid boiling evaporation. [0003] Separately controlled phase change technology divides the traditional unified phase change heat process into independent units and different processes, and controls the phase change parameters of different units separately according to needs, so that the adaptability and economy of phase change heat are greatly improved. improvement. Di...

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Problems solved by technology

However, in this invention, when the system controls the subcooling degree of the condensate, it mainly relies on the heat exchange between the condensate and the steam generated by the heat source heat exchanger. limited; in addition, the heat exchange between the subcooled liquid and the steam in the previous system is before the booster pump, and at low load, there is still a degree of subcooling relative to the evaporating liquid of the heat source heat exchanger; the condensate with the degree of supercooling directly enters the external smoke The final heating surface of the heat source heat exchanger with low air temperature, the probability of low-temperature corrosion on the final heating surface increases; the water level control of the heat source heat exchanger adopts a water level gauge and a liquid flow regulating valve, the system is relatively complicated, and the liquid flow The booster pump is prone to cavitation when the regulating valve is closed; the heat transfer control of the heat source heat exchanger mostly uses the parameters of the internal circulating working fluid to control the wall temperature of the heat exchanger, which is better for working conditions where the heat flux is relatively small or relatively stable. The wall temperature control is also relatively stable, but for the working condition where the heat flux changes greatly, the fluctuation range of the wall temperature is also large, so the set parameters of the adjusted working substance may often be outside the optimal range, affecting the system's optimum performance. Best economy and safety

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