The invention provides an experiment apparatus for researching thermal hydraulic characteristics in a heating rod bundle channel under a dynamic condition An experimental loop system comprises a circulating water pump, a first control ball valve, a preheater, a filter, a first sub-header, an electromagnetic flow meter, a rod bundle channel experiment body, a second sub-header, a condenser and an exhaust valve, the end part of the exhaust valve is connected with the circulating water pump, and the circulating water pump is connected with the first control ball valve and then is provided with a second control ball valve in a parallel manner; a circulating cooling water system comprises a water storage tank, and a cooling water pump and a cooling tower which are respectively connected with the water storage tank, and the end part of the cooling water pump and the end part of the cooling tower are respectively connected with the condenser through pipelines; and a control and data acquisition system comprises an angle sensor, a differential pressure gauge and pressure gauge and thermocouple, a signal acquirer and a computer The apparatus has the advantages of simplicity, easiness in operation, obtaining of stable experimental data, and facilitation of the scientific research of the flow and heat transfer in the rod bundle channel and the engineering design of a passive safety system

Experiment apparatus for researching thermal hydraulic characteristics in heating rod bundle channel under dynamic condition

The invention provides a bubble reactor testing apparatus. The apparatus comprises a micro-bubble generating device, a fluid oscillator, a reaction kettle, a variable frequency circulating pump and a circulation open water tank, wherein the variable frequency circulating pump is connected with the circulating open water tank through a return pipeline; the outlet of the variable frequency circulating pump is connected with the micro-bubble generating device; the micro-bubble generating device is arranged vertically upwards, and the upper part of the micro-bubble generating device is transitionally connected to the fluid oscillator through a square tube; the upper part of the fluid oscillator is connected with the lower side inlet of the reaction kettle through a flange; and the reaction kettle is connected with the circulating open water tank through a pipeline. The apparatus can realize the high-speed blending function in a reaction kettle, and is widely used in various industries. The fluid oscillator, the micro-bubble generating device (Venturi bubbler), a related control system and a visual measuring device are combined, so the apparatus is a highly-efficient bubble reactor testing apparatus, and provides an effective measurement and control way.

Bubble reactor testing apparatus

The invention provides a non-heat-isolation rise section low-pressure low-high-difference natural circulation test device, which comprises an electric heater, a visual system, a lower horizontal section, a data measuring and collection system, a water tank and a temperature control system. The device is used for studying the influence of thermal hydraulic parameters and geometrical structure parameters such as power, supercooling degree, resistance, visual section inclined angle and length-to-diameter ratio on a natural circulation system under the conditions of low pressure and low high difference.

Low-pressure low-high-difference natural circulation test device

Belonging to the field of containment passive heat removal technologies, the invention particularly relates to a device for studying the influence of containment passive heat removal system natural circulation resistance. The high temperature and high pressure water vapor produced by an electric boiler enters a containment simulator through an upper vapor pipeline and a lower vapor pipeline to heat a heat exchanger therein, the boiling temperature of liquid in the heat exchanger pipeline rises and the liquid enters a cooling water tank through a natural circulation ascending section, the liquid in the cooling water tank declines and flows through the heat exchanger through a natural circulation descending section, thus forming natural circulation flow, and taking away the heat in the containment simulator continuously, lowering the pressure of the containment simulator, and ensuring the safety of the containment simulator. The opening degrees of a natural circulation ascending sectionisolation valve and a natural circulation descending section isolation valve are controlled remotely to increase the resistance of a natural circulation loop. The device provided by the invention canprovide reference for decision making under abnormal operating conditions after completion of a power station.

Device for studying influence of containment passive heat removal system natural circulation resistance

The invention aims to provide an experiment device for study characteristics of breakage behaviors of aerosol-containing liquid bath surface bubbles and an experiment method of the experiment device.The experiment device comprises a preheating water tank, a heating water tank, an air cavity, a flash rising section, an overflowing water tank, a backflow water tank and an ultrasonic generator, wherein the lower part of the ultrasonic generator is connected with a descending tube; the descending tube extends into the preheating water tank; the bottom of the preheating water tank is communicatedwith a peristaltic pump; the peristaltic pump is communicated with a coiled tube through a hose; the coiled tube is arranged inside the heating water tank; the heating water tank is communicated witha water storage container through a water injection pipeline and a valve; the outlet of the coiled tube is communicated with the inlet of a flash section; the overflowing water tank, the flash risingsection and the air cavity are sequentially connected from top to bottom; the overflowing water tank is fixed inside the backflow water tank; the flash rising section is fixed below the backflow watertank. By adopting the experiment device, behaviors that bubbles are broken to generate liquid droplets in different liquid-phase environments at different temperatures can be measured, and entrainment behaviors of aerosol under accident working conditions of nuclear power plants can be well reappeared.

Experiment device for study characteristic of breakage behavior of aerosol-containing liquid bath surface bubble and experiment method of experiment device

The invention provides a two-phase flow device for researching the enhancement of the natural circulation capacity of a system. The two-phase flow device consists of a circulating water system, an air bubble generation device, an air supply system and a data acquisition system, wherein the circulating water system mainly comprises an open type water tank, a filter device, a heat exchanger and other relevant pipelines and valves; the air bubble generation device is a core of the device and consists of an external sleeve and a multiporous medium sleeve; the air supply system mainly comprises an air compressor, an air storage tank and a pressure reducing valve; the data acquisition system mainly consists of an integrated data acquisition system, a high-speed camera system, a gas mass flow meter, an electromagnetic flow meter, a pressure sensor and a temperature sensor. The two-phase flow device can effectively solve the problem of disturbance to a natural circulation system due to active air injection and reduce the additional resistance involved into a circulation loop; the device is simple, easy to operate and uniform in foaming; stable bubble flow can be obtained; the two-phase flow device is favorable for scientific design of natural circulation and two-phase flow and engineering design of a passive safety system.

Two-phase flow device for researching enhancement of natural circulation capacity of system

The invention provides an open passive heat extraction system suitable for long-term operation condition, comprising: a heat exchange water tank, a filter device, a mass flowmeter, a heat exchanger, a bubble generator, a gas storage tank, a temperature sensor and other corresponding valve pipes. Compared with traditional passive heat extraction systems, the system is provided with the additional bubble generator, and heat changing capacity of the system is improved by means of adjusting gas injection according to system operation condition; by using peripheral gas injection, it is possible to effectively reduce additional resistance intervening a circulating loop; equipment is simple, easy to operate and capable of uniform bubbling, stable bubble flows can be generated, natural circulating capacity of the passive heat extraction system can be enhanced, the problem that reduced system heat exchanging capacity and instable flashing flow occur in long-term operation condition is solved, the passive characteristic of the system can be retained, and the passive heat extraction system is safer and more reliable.

Cao Pengjiu

Papers

Two-phase flow device for researching enhancement of natural circulation capacity of system

Open passive heat extraction system suitable for long-term operation condition