A natural circulation system with auxiliary power and hot bubble driving module

Abstract

The present invention provides a natural circulation system with auxiliary power and a hot bubble driving module, which relate to the field of natural circulation systems. The natural circulation system with auxiliary power includes a steam generator, a heat exchanger, and a hot bubble driving module. A steam pipeline is connected between the outlet of the steam generator and the inlet of the heat exchanger, and a water pipeline is connected between the outlet of the heat exchanger and the inlet of the steam generator; the hot bubble driving module includes a power cavity and an oscillating exhaust structure, and a first interface and a second interface connected to the water pipeline are provided on the power cavity. The water inlet resistance of the first interface is less than the water inlet resistance of the second interface, and the drainage resistance of the first interface is greater than the drainage resistance of the second interface; the steam inlet of the oscillating exhaust structure is connected to the steam pipeline, and the steam exhaust port of the oscillating exhaust structure is connected to the power cavity. The auxiliary power is formed by the continuous operation of the hot bubble driving module in the suction-discharge-suction-discharge mode, which ensures the circulation effect of the fluid.

Description

Technical Field

[0001] The invention relates to the technical field of natural circulation systems, and in particular to a natural circulation system with auxiliary power and a hot bubble driving module. Background Art

[0002] In the field of thermal energy, especially in nuclear power projects, passive safety systems are usually used to discharge the high-temperature heat inside the reactor. Since passive safety systems do not require mechanical components and circuit control, they have better operating stability.

[0003] The natural circulation system is a passive safety system designed using the density difference between steam and water. For example, the Chinese invention patent application with application publication number CN108648837A and application publication date 2018.10.12 discloses a modular small reactor with full natural circulation, and specifically discloses that the reactor includes a reactor body, a containment vessel, a water pool and a passive residual heat removal system. The passive residual heat removal system includes a heat exchanger, one end of the heat exchanger is connected to the water feed inlet of the direct current steam generator through a pipeline and a residual heat removal system outlet isolation valve, and the other end is connected to the steam outlet of the direct current steam generator through a pipeline and a residual heat removal system inlet isolation valve, and a water supply tank is arranged between the steam outlet and the heat exchanger.

[0004] When cold water is in the direct current steam generator, it is heated into steam. The steam enters the heat exchanger through the pipeline and the waste heat removal system outlet isolation valve and is condensed into cold water. The cold water then circulates to the direct current steam generator through the pipeline and the waste heat removal system inlet isolation valve. Due to the gravity difference between the cold water and steam in the pipeline, the fluid is driven to circulate in the loop.

[0005] However, in the actual operation of such systems, most of the energy is directly dissipated in the water tank, and only a small amount of thermal energy is converted into driving force for the fluid. The efficiency of dynamic conversion is low and the circulation effect of the fluid is poor. Summary of the invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a natural circulation system with auxiliary power to solve the problems of low energy conversion efficiency and poor fluid circulation effect of the existing natural circulation system. At the same time, the purpose of the present invention is also to provide a hot bubble driving module of the natural circulation system with auxiliary power.

[0007] The technical solution of the natural circulation system with auxiliary power of the present invention is:

[0008] The natural circulation system with auxiliary power comprises a steam generator, a heat exchanger, and a hot bubble driving module, wherein a steam pipeline is connected between the outlet of the steam generator and the inlet of the heat exchanger, and a water pipeline is connected between the outlet of the heat exchanger and the inlet of the steam generator;

[0009] The hot bubble driving module includes a power cavity and an oscillating exhaust structure, the power cavity is provided with a first interface and a second interface connected to the water pipeline, the water inlet resistance of the first interface is smaller than the water inlet resistance of the second interface, and the water discharge resistance of the first interface is larger than the water discharge resistance of the second interface; the steam inlet of the oscillating exhaust structure is connected to the steam pipeline, and the steam exhaust port of the oscillating exhaust structure is connected to the power cavity.

[0010] Furthermore, fluid diodes are respectively provided at the first interface and the second interface. The fluid diode located at the first interface is a first fluid diode, and the fluid diode located at the second interface is a second fluid diode. The forward liquid flow resistance of the fluid diode along the water-liquid pipeline is smaller than the reverse liquid flow resistance along the water-liquid pipeline.

[0011] Furthermore, the fluid diode is a contraction / expansion type diode, which includes an inlet pipe section and a drainage pipe section, and a conical pipe section connected between the inlet pipe section and the drainage pipe section, wherein the contraction opening of the conical pipe section is connected to the inlet pipe section, and the expansion opening of the conical pipe section is connected to the drainage pipe section.

[0012] Furthermore, the first fluid diode also includes a connecting plate arranged between the contraction port of the conical tube section and the water inlet pipe section, and the connecting plate is an annular plate arranged perpendicular to the axial direction of the conical tube section, and the diameter of the water inlet pipe section of the first fluid diode is the same as the diameter of the drainage pipe section of the first fluid diode.

[0013] Furthermore, the fluid diode is any one of a vortex diode, a rotary vane diode or a Tesla diode.

[0014] Furthermore, the oscillating exhaust structure includes an oscillating exhaust shell and an injection pipe, the steam inlet of the oscillating exhaust structure is arranged on the oscillating exhaust shell and corresponds to the jet direction of the injection pipe, the side wall of the oscillating exhaust shell close to the injection pipe is a collision wall, and the exhaust port of the oscillating exhaust structure is arranged at the end of the injection pipe.

[0015] Furthermore, a vortex steam chamber is also provided inside the oscillating exhaust shell, and the vortex steam chamber is arranged outside the jet path of the injection pipe, and the vortex steam chamber is centrally symmetrical about the jet axis of the injection pipe.

[0016] Furthermore, the collision wall is a conical annular wall surface that opens and enlarges toward the jet direction of the injection pipe, and the inner edge of the conical annular wall surface is connected to the pipe opening of the injection pipe.

[0017] Furthermore, a first buffer tank is provided on the water-liquid pipeline at the upstream of the power cavity, and / or a second buffer tank is provided on the water-liquid pipeline at the downstream of the power cavity.

[0018] Beneficial effect: When in use, the condensed water enters the power cavity through the water pipeline, the water fills the inside of the power cavity, and part of the high-temperature steam in the steam pipeline enters the oscillating exhaust structure through the steam inlet of the oscillating exhaust structure. This part of the high-temperature steam forms an oscillating pulse steam flow when passing through the oscillating exhaust structure. The oscillating pulse steam flow enters the power cavity through the exhaust port of the oscillating exhaust structure and forms hot steam bubbles inside the power cavity. The hot steam bubbles expand and contract with the steam volume of the oscillating pulse steam flow.

[0019] Since the water inlet resistance of the first interface is smaller than that of the second interface, when the volume of the hot bubble shrinks, the water inlet flow rate of the first interface is larger than that of the second interface, so the power cavity net inhales water from the first interface, that is, the liquid replenishment state; since the drainage resistance of the first interface is larger than the drainage resistance of the second interface, when the volume of the hot bubble expands, the drainage flow rate of the second interface is larger than the drainage flow rate of the first interface, so the power cavity net discharges water from the second interface, that is, the pumping state; the hot bubble driving module is used to perform continuous suction-discharge-suction-discharge operation, thereby forming auxiliary power for the water in the water pipeline, so that more thermal energy is converted into driving force for the fluid, the efficiency of active conversion is improved, and the circulation effect of the fluid is ensured.

[0020] The technical solution of the hot bubble driving module of the present invention is:

[0021] The hot bubble driving module includes a power cavity and an oscillating exhaust structure, the power cavity is provided with a first interface and a second interface for connecting to a water pipeline, the water inlet resistance of the first interface is smaller than the water inlet resistance of the second interface, and the water discharge resistance of the first interface is larger than the water discharge resistance of the second interface; the steam inlet of the oscillating exhaust structure is used to connect to the steam pipeline, and the steam exhaust port of the oscillating exhaust structure is connected to the power cavity.

[0022] Furthermore, fluid diodes are respectively provided at the first interface and the second interface. The fluid diode located at the first interface is a first fluid diode, and the fluid diode located at the second interface is a second fluid diode. The forward liquid flow resistance of the fluid diode along the water-liquid pipeline is smaller than the reverse liquid flow resistance along the water-liquid pipeline.

[0023] Furthermore, the fluid diode is a contraction / expansion type diode, which includes an inlet pipe section and a drainage pipe section, and a conical pipe section connected between the inlet pipe section and the drainage pipe section, wherein the contraction opening of the conical pipe section is connected to the inlet pipe section, and the expansion opening of the conical pipe section is connected to the drainage pipe section.

[0024] Furthermore, the first fluid diode also includes a connecting plate arranged between the contraction port of the conical tube section and the water inlet pipe section, and the connecting plate is an annular plate arranged perpendicular to the axial direction of the conical tube section, and the diameter of the water inlet pipe section of the first fluid diode is the same as the diameter of the drainage pipe section of the first fluid diode.

[0025] Furthermore, the fluid diode is any one of a vortex diode, a rotary vane diode or a Tesla diode.

[0026] Furthermore, the oscillating exhaust structure includes an oscillating exhaust shell and an injection pipe, the steam inlet of the oscillating exhaust structure is arranged on the oscillating exhaust shell and corresponds to the jet direction of the injection pipe, the side wall of the oscillating exhaust shell close to the injection pipe is a collision wall, and the exhaust port of the oscillating exhaust structure is arranged at the end of the injection pipe.

[0027] Furthermore, a vortex steam chamber is also provided inside the oscillating exhaust shell, and the vortex steam chamber is arranged outside the jet path of the injection pipe, and the vortex steam chamber is centrally symmetrical about the jet axis of the injection pipe.

[0028] Furthermore, the collision wall is a conical annular wall surface that opens and enlarges toward the jet direction of the injection pipe, and the inner edge of the conical annular wall surface is connected to the pipe opening of the injection pipe.

[0029] Beneficial effect: When in use, the condensed water enters the power cavity through the water pipeline, the water fills the inside of the power cavity, and part of the high-temperature steam in the steam pipeline enters the oscillating exhaust structure through the steam inlet of the oscillating exhaust structure. This part of the high-temperature steam forms an oscillating pulse steam flow when passing through the oscillating exhaust structure. The oscillating pulse steam flow enters the power cavity through the exhaust port of the oscillating exhaust structure and forms hot steam bubbles inside the power cavity. The hot steam bubbles expand and contract with the steam volume of the oscillating pulse steam flow.

[0030] Since the water inlet resistance of the first interface is smaller than that of the second interface, when the volume of the hot bubble shrinks, the water inlet flow rate of the first interface is larger than that of the second interface, so the power cavity net inhales water from the first interface, that is, the liquid replenishment state; since the drainage resistance of the first interface is larger than the drainage resistance of the second interface, when the volume of the hot bubble expands, the drainage flow rate of the second interface is larger than the drainage flow rate of the first interface, so the power cavity net discharges water from the second interface, that is, the pumping state; the hot bubble driving module is used to perform continuous suction-discharge-suction-discharge operation, thereby forming auxiliary power for the water in the water pipeline, so that more thermal energy is converted into driving force for the fluid, the efficiency of active conversion is improved, and the circulation effect of the fluid is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the working principle of the natural circulation system with auxiliary power in the specific embodiment 1 of the natural circulation system with auxiliary power of the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the medium-heat bubble drive module;

[0033] Figure 3 for Figure 1 A schematic diagram of the structure of the fluid diode at the first interface;

[0034] Figure 4 for Figure 1 Structural schematic diagram of the medium oscillating exhaust structure;

[0035] Figure 5 It is a steam flow-time relationship diagram of the injection pipe of the oscillating exhaust structure in the specific embodiment 1 of the natural circulation system with auxiliary power of the present invention.

[0036] In the figure: 1. steam generator; 11. steam pipeline; 2. heat exchanger; 21. water pipeline; 3. hot bubble drive module; 30. power cavity; 301. first interface; 302. second interface; 31. first fluid diode; 310. cone pipe section; 311. water inlet pipe section; 312. water discharge pipe section; 313. connecting plate; 32. second fluid diode; 33. oscillating exhaust structure; 330. oscillating exhaust shell; 331. injection pipe; 332. collision wall; 333. steam inlet of oscillating exhaust structure; 334. steam exhaust port of oscillating exhaust structure; 335. vortex steam cavity; 34. first buffer tank; 35. second buffer tank; W, steam flow; t, time. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] A specific embodiment 1 of the natural circulation system with auxiliary power of the present invention is as follows: Figures 1 to 5 As shown, the natural circulation system with auxiliary power includes a steam generator 1, a heat exchanger 2, and a hot bubble driving module 3. A steam pipeline 11 is connected between the outlet of the steam generator 1 and the inlet of the heat exchanger 2, and a water-liquid pipeline 21 is connected between the outlet of the heat exchanger 2 and the inlet of the steam generator 1. In this embodiment, the entire natural circulation system is arranged as a vertical loop, the steam generator 1 is arranged at a lower position, and the heat exchanger 2 is arranged at an upper position. The high-temperature steam flows upward to the heat exchanger 2 through the steam pipeline 11, and the steam condenses into water and flows downward through the water-liquid pipeline 21 to circulate back to the steam pipeline 11. The gravity difference between the water in the water-liquid pipeline 21 and the steam in the steam pipeline 11 is used to realize the circulation of the fluid in the system.

[0039] Among them, the hot bubble driving module 3 includes a power cavity 30 and an oscillating exhaust structure 33. The power cavity 30 is provided with a first interface 301 and a second interface 302 connected to the water pipeline 21. The water inlet resistance of the first interface 301 is smaller than the water inlet resistance of the second interface 302, and the drainage resistance of the first interface 301 is greater than the drainage resistance of the second interface 302; the oscillating exhaust structure 33 is provided with an air inlet and an exhaust port, the steam inlet 333 of the oscillating exhaust structure is connected to the steam pipeline 11, and the steam exhaust port 334 of the oscillating exhaust structure is connected to the power cavity 30.

[0040] When in use, the condensed water enters the power cavity 30 through the water-liquid pipeline 21, the water fills the interior of the power cavity 30, and part of the high-temperature steam in the steam pipeline 11 enters the oscillating exhaust structure 33 through the steam inlet 333 of the oscillating exhaust structure. This part of the high-temperature steam forms an oscillating pulse steam flow when passing through the oscillating exhaust structure 33. The oscillating pulse steam flow enters the power cavity 30 through the exhaust port 334 of the oscillating exhaust structure and forms hot bubbles inside the power cavity 30. The hot bubbles expand and contract with the steam volume of the oscillating pulse steam flow.

[0041] Since the water inlet resistance of the first interface 301 is smaller than the water inlet resistance of the second interface 302, when the volume of the hot bubble shrinks, the water inlet flow of the first interface 301 is greater than the water inlet flow of the second interface 302, so the power cavity 30 net inhales water from the first interface 301, that is, the rehydration state; since the drainage resistance of the first interface 301 is greater than the drainage resistance of the second interface 302, when the volume of the hot bubble expands, the drainage flow of the second interface 302 is greater than the drainage flow of the first interface 301, so the power cavity 30 net discharges water from the second interface 302, that is, the pumping state; the hot bubble driving module 3 is used to perform the continuous operation of suction-discharge-suction-discharge, thereby forming an auxiliary power for the water in the water pipeline 21, so that more thermal energy is converted into the driving force of the fluid, the efficiency of the active conversion is improved, and the circulation effect of the fluid is ensured.

[0042] In addition, fluid diodes are provided at the first interface 301 and the second interface 302, respectively, and the forward flow resistance of the fluid diodes along the water-liquid pipeline 21 is less than the reverse flow resistance along the water-liquid pipeline 21. Specifically, the fluid diode located at the first interface 301 is the first fluid diode 31, and the fluid diode located at the second interface 302 is the second fluid diode 32. The direction from the heat exchanger 2 to the steam generator 1 along the water-liquid pipeline 21 is the forward flow direction, and the reverse direction is the reverse flow direction. The forward flow resistance of the two fluid diodes 32 along the water-liquid pipeline 21 is less than the reverse flow resistance along the water-liquid pipeline 21, that is, the water is easy to enter the power cavity 30 through the first fluid diode 31, and the water is difficult to be discharged from the power cavity 30 through the first fluid diode 31 (similar to a check valve); accordingly, the water is easy to be discharged from the power cavity 30 through the second fluid diode 32, and the water is difficult to enter the power cavity 30 through the second fluid diode 32 (also similar to a check valve).

[0043] Both fluid diodes are contraction / expansion type diodes. The structures of the first fluid diode 31 and the second fluid diode 32 are basically the same. In this embodiment, the first fluid diode 31 is taken as an example for detailed description. The contraction / expansion type diode includes an inlet pipe section 311 and a drainage pipe section 312, and a conical pipe section 310 connected between the inlet pipe section 311 and the drainage pipe section 312. The contraction port of the conical pipe section 310 is connected to the inlet pipe section 311, and the expansion port of the conical pipe section 310 is connected to the drainage pipe section 312. The contraction / expansion type diode has different resistance coefficients in different flow directions. When the flow is from the inlet pipe section 311 to the drainage pipe section 312 (in the forward liquid flow direction), as shown in FIG. Figure 3 As shown, the flow cross-sectional area gradually increases, and the contraction / expansion diode acts as an expansion tube, and its flow resistance coefficient f 扩张When the flow from the drainage pipe section 312 to the water inlet pipe section 311 (in the reverse direction of the liquid flow), the flow cross-sectional area gradually decreases. The contraction / expansion type diode acts as a contraction tube, and its flow resistance coefficient f 收缩 It is larger, so a fluid replacement state and a pumping state are formed.

[0044] Among them, the structural difference between the first fluid diode 31 and the second fluid diode 32 is that the first fluid diode also includes a connecting plate 313 arranged between the contraction mouth of the conical tube section 310 and the water inlet pipe section 311, and the connecting plate 313 is an annular plate arranged perpendicular to the axial direction of the conical tube section 310, and the pipe diameter of the water inlet pipe section 311 of the first fluid diode 31 is the same as the pipe diameter of the drainage pipe section 312 of the first fluid diode 31.

[0045] The oscillating exhaust structure 33 includes an oscillating exhaust shell 330 and a jet pipe 331. The steam inlet 333 of the oscillating exhaust structure is arranged on the oscillating exhaust shell 330 and corresponds to the jet direction of the jet pipe 331. The side wall of the oscillating exhaust shell 330 close to the jet pipe 331 is a collision wall 332. The exhaust port 334 of the oscillating exhaust structure is arranged at the end of the jet pipe 331. In addition, a vortex steam chamber 335 is also arranged inside the oscillating exhaust shell 330. The vortex steam chamber 335 is arranged at the outer position of the jet path of the jet pipe 331. The vortex steam chamber 335 is arranged in a central symmetric manner with respect to the jet axis of the jet pipe 331. Specifically, the collision wall 332 is a conical annular wall surface that opens and enlarges toward the jet direction of the jet pipe 331, and the inner edge of the conical annular wall surface is connected to the pipe mouth of the jet pipe 331.

[0046] When the stable steam jet enters the oscillating exhaust shell 330 through the steam inlet 333 of the oscillating exhaust structure, the steam jet exchanges momentum with the stationary steam entering the oscillating exhaust shell 330, and the stationary steam is driven by the high-speed steam jet, and a jet shear layer is formed between the interface of the two; due to the high speed of the steam jet, the jet shear layer induced is a turbulent shear layer with a large unstable shape; the steam located around the turbulent shear layer is entrained to generate a vortex, and the vortex exists in the form of a vortex ring and accompanies the movement of the steam jet. An axisymmetric disturbance with a certain frequency component is formed in the shear layer, and collides with the collision wall 332 together with the steam jet, inducing a pressure disturbance wave of a certain frequency in the collision zone, and the pressure disturbance wave is reflected back at high speed to the initial separation zone. Since the initial separation zone is sensitive to the disturbance effect, the disturbance wave causes the initial separation zone to generate a new vortex pulsation.

[0047] The instability of the turbulent shear layer has a selective amplification effect on disturbances. The disturbances developed in the separation zone are amplified as they propagate downstream. When the amplified disturbances reach the collision wall 332, they are reflected upstream. The reflected disturbances act on the fluid, causing changes in pressure and velocity, and generating a pulsating pressure field in the collision zone. On the one hand, these disturbances are transmitted to the separation zone, which is extremely sensitive to disturbances, through the flow field in the oscillating exhaust shell 330, causing new disturbances in the separation zone. On the other hand, they stimulate the lateral pulsation of the jet shear layer in the collision zone, affecting the jet core, causing the flow resistance at the exhaust port 334 of the oscillating exhaust structure to change periodically, causing flow changes, and then generating oscillating pulse jets, such as Figure 5 As shown, the steam flow rate W undergoes periodic oscillation changes with time t.

[0048] In addition, since the hot bubble driving module 3 performs periodic driving, a first buffer tank 34 is provided on the water-liquid pipeline 21 at the upstream of the power cavity 30, and a second buffer tank 35 is provided on the water-liquid pipeline 21 at the downstream of the power cavity 30, and nitrogen is filled in the first buffer tank 34 and the second buffer tank 35 to buffer the fluctuation caused by the change of the water-liquid flow. In addition, in order to alleviate the pressure oscillation caused by the periodic condensation of steam and prevent the resonance problem caused by the frequency of the steam pulse jet, an expansion joint can also be provided in the natural circulation system to avoid the adverse effects of vibration on the entire system.

[0049] In other specific embodiments of the natural circulation system with auxiliary power of the present invention, in order to meet different usage requirements, the fluid diode is not limited to the contraction / expansion type diode in specific embodiment 1. The fluid diode can also be any one of an eddy current diode, a rotary vane diode or a Tesla diode. Similarly, the forward liquid flow resistance of the fluid diode along the water pipeline can be smaller than the reverse liquid flow resistance along the water pipeline, thereby achieving the driving purpose of continuous suction-exhaust-suction-exhaust.

[0050] In other specific embodiments of the natural circulation system with auxiliary power of the present invention, in order to meet different usage requirements and to reduce the fluctuations caused by changes in water flow, a group of hot bubble driving modules can be arranged on the water pipeline. The lengths of the steam transmission pipelines between different hot bubble driving modules and the steam pipeline are different. The fluctuation phase of the output flow of the hot bubble driving module is adjusted, and mutual offset and compensation are achieved through staggered operation, thereby reducing the fluctuation of the flow.

[0051] The specific embodiment of the hot bubble driving module of the present invention is the same as the specific embodiment of the hot bubble driving module in the specific implementation mode of the natural circulation system with auxiliary power of the present invention, and will not be described in detail here.

[0052] In other specific embodiments of the hot bubble driving module of the present invention, in order to meet different usage requirements, the structural form of the natural circulation system of the hot bubble driving module is not limited to the vertical loop arrangement in specific embodiment 1, and the natural circulation system can also be arranged as a horizontal loop, and the periodic driving force of the hot bubble driving module can be used alone to achieve the circulation of the fluid; in addition, the natural circulation system can also be arranged as an oblique loop or an undulating loop.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A natural circulation system with auxiliary power, characterized in that: It includes a steam generator, a heat exchanger, and a hot bubble driving module, wherein a steam pipeline is connected between the outlet of the steam generator and the inlet of the heat exchanger, and a water pipeline is connected between the outlet of the heat exchanger and the inlet of the steam generator; The hot bubble driving module includes a power cavity and an oscillating exhaust structure, the power cavity is provided with a first interface and a second interface connected to the water pipeline, the water inlet resistance of the first interface is smaller than the water inlet resistance of the second interface, and the drainage resistance of the first interface is larger than the drainage resistance of the second interface; the steam inlet of the oscillating exhaust structure is connected to the steam pipeline, and the steam exhaust port of the oscillating exhaust structure is connected to the power cavity; The oscillating exhaust structure comprises an oscillating exhaust shell and an injection pipe, the steam inlet of the oscillating exhaust structure is arranged on the oscillating exhaust shell and corresponds to the jet direction of the injection pipe, the side wall of the oscillating exhaust shell close to the injection pipe is a collision wall, and the exhaust port of the oscillating exhaust structure is arranged at the end of the injection pipe; A stable steam jet enters the oscillating exhaust shell through the steam inlet of the oscillating exhaust structure, the steam jet exchanges momentum with the inlet, the stationary steam in the oscillating exhaust shell is driven by the high-speed flowing steam jet, and a jet shear layer is formed between the interface of the two; The jet shear layer is a turbulent shear layer. The steam around the turbulent shear layer is entrained to generate a vortex. The vortex exists in the form of a vortex ring. The vortex accompanies the steam jet and collides with the collision wall to generate a pressure disturbance wave. The pressure disturbance wave is reflected back to the initial separation zone, and the initial separation zone generates new vortex pulsation.

2. The natural circulation system with auxiliary power according to claim 1, characterized in that: Fluid diodes are respectively provided at the first interface and the second interface. The fluid diode located at the first interface is a first fluid diode, and the fluid diode located at the second interface is a second fluid diode. The forward liquid flow resistance of the fluid diode along the water-liquid pipeline is smaller than the reverse liquid flow resistance along the water-liquid pipeline.

3. The natural circulation system with auxiliary power according to claim 2, characterized in that: The fluid diode is a contraction / expansion type diode, which includes an inlet pipe section and a drainage pipe section, and a conical pipe section connected between the inlet pipe section and the drainage pipe section, wherein the contraction opening of the conical pipe section is connected to the inlet pipe section, and the expansion opening of the conical pipe section is connected to the drainage pipe section.

4. The natural circulation system with auxiliary power according to claim 3, characterized in that: The first fluid diode also includes a connecting plate arranged between the contraction opening of the conical tube section and the water inlet pipe section, wherein the connecting plate is an annular plate arranged perpendicular to the axial direction of the conical tube section, and the diameter of the water inlet pipe section of the first fluid diode is the same as the diameter of the drainage pipe section of the first fluid diode.

5. The natural circulation system with auxiliary power according to claim 2, characterized in that: The fluid diode is any one of an eddy current diode, a rotary vane diode or a Tesla diode.

6. The natural circulation system with auxiliary power according to claim 1, characterized in that: A vortex steam chamber is also provided inside the oscillating exhaust shell. The vortex steam chamber is arranged outside the jet path of the injection pipe and is centrally symmetrically arranged with respect to the jet axis of the injection pipe.

7. The natural circulation system with auxiliary power according to claim 6, characterized in that: The collision wall is a conical annular wall surface that opens and enlarges toward the jet direction of the injection pipe, and the inner edge of the conical annular wall surface is connected to the pipe opening of the injection pipe.

8. The natural circulation system with auxiliary power according to claim 2, characterized in that: A first buffer tank is disposed on the water-liquid pipeline upstream of the power cavity, and / or a second buffer tank is disposed on the water-liquid pipeline downstream of the power cavity.

9. A hot bubble driving module, characterized in that: The thermal bubble driving module is a thermal bubble driving module in a natural circulation system with auxiliary power as described in any one of claims 1 to 7.

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