Sub-control phase change heat transfer system and sub-control phase change heat transfer method

Abstract

The invention relates to a sub-control phase change heat transfer system. The sub-control phase change heat transfer system comprises a heat absorption device and a heat release device which are mutually communicated through a vapor pipe (11) and a condensed fluid pipe (21) so as to form a sub-control phase change heat transfer loop. The sub-control phase change heat transfer system is characterized by comprising an airflow regulating valve (6), an airflow regulating valve controller (8), a liquid flow regulating valve (24) and liquid flow regulating valve controller (25), wherein the airflow regulating valve (6) is arranged in the pipeline of the vapor pipe (11) and the opening of the airflow regulating valve (6) is controllable; and the liquid flow regulating valve (24) is arranged in the pipeline of the condensed fluid pipe (21) and the opening of the liquid flow regulating valve (24) is controllable. The invention also provides a sub-control heat transfer method. In the method, the phase change heat transfer parameters of the heat absorption device and the heat release device are respectively independently controlled.

Description

technical field [0001] The invention belongs to the technical field of safe and controllable enhanced heat transfer, and is particularly suitable for use in the fields of waste heat recovery and utilization of boiler flue gas and production process tail gas. 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. In terms of reducing boiler exhaust gas temperature, recovering waste heat and improving thermal efficiency, heat pipes or other phase conversion heat technologies are often used to control the corrosion and ash deposition speed of the heating surface on the flue gas side through different technical solutions, and better results have been achieve...

AI Technical Summary

Problems solved by technology

There are also phase change heat systems that use heat release devices or heat absorption devices to control phase change parameters by fluid recirculation. Not only the adjustment characteristics are not good, the control lag is large, and the equipment investment is large, which increases the difficulty of equipment site layout. Cycling also significantly increases the energy consumption of the system

In addition, the traditional phase-change heat technology adopts the return water method of gravity self-flow, which inevitably requires the position of the condensing pipe to be higher than the evaporating pipe, which brings great difficulties to on-site installation and technical transformation, and even cannot be implemented.

When the traditional phase-change heat technology evacuates the non-condensable gas in the system, it must be carried out when the heat absorption of the heat-absorbing device is greater than the heat release of the heat-dissipating device, so that the system is under positive pressure, and the emptying capacity is limited, reducing the Phase transformation thermal coefficient and system suitability

Although the closed heat pipe is evacuated at one time, due to various reasons such as the chemical reaction between the medium and the metal and gas precipitation, the non-condensable gas in the closed tube gradually increases, and the effectiveness gradually decreases.

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