Corrugation depth testing device for plate heat exchanger of nuclear power plant

Abstract

The utility model discloses a nuclear power plant plate heat exchanger ripple depth test device, which comprises a water storage tank, an output pipeline, a variable frequency pump, a plate heat exchanger, a first valve, a second valve, a measurement loop and a backflow pipeline, and the water storage tank, the output pipeline, the plate heat exchanger and the backflow pipeline are sequentially connected end to end to form a circulation loop. The variable frequency pump is connected in series with the plate heat exchanger, the first valve is connected to an upstream output pipeline of the plate heat exchanger, and the second valve is connected to a downstream backflow pipeline of the plate heat exchanger; the measuring loop is connected with the plate heat exchanger in parallel and used for measuring the pressure difference of the plate heat exchanger. The water inlet end of the plate heat exchanger is detachably connected with the output pipeline, and the water outlet end of the plate heat exchanger is detachably connected with the backflow pipeline so that plate heat exchangers with different corrugation depths can be replaced. The water storage tank is provided with a feeding port for feeding a test source to simulate a marine organism environment. The device can be used for simulating a marine organism environment and testing the circulation performance of plate heat exchangers with different corrugation depths.

Description

Technical Field

[0001] This utility model relates to the technical field of plate heat exchanger selection for nuclear power plants, and in particular to a test device for corrugation depth of plate heat exchangers for nuclear power plants. Background Technology

[0002] For nuclear power plants, it is necessary to conduct research on the selection of heat exchangers for important plant water systems. While ensuring the heat exchange efficiency of the heat exchangers, the flow diameter on the cold side of the heat exchangers and the aperture of the drum screen should be increased to improve the flow capacity of the water intake system.

[0003] In nuclear power plants, the reactor coolant system (RRI) and emergency core cooling system (SEC) both draw water downstream of the circulating water filtration system (CFI) using a rotary drum filter. The SEC shellfish trap and the RRI / SEC heat exchanger are key equipment for drawing water from the cold source.

[0004] Selecting the right heat exchanger is a major challenge that needs to be addressed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a test device for the corrugation depth of plate heat exchangers in nuclear power plants.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a corrugation depth testing device for a plate heat exchanger in a nuclear power plant, comprising a water storage tank, an output pipe, a variable frequency pump, a plate heat exchanger, a first valve, a second valve, a measuring circuit, and a return pipe. The water storage tank, the output pipe, the plate heat exchanger, and the return pipe are connected end-to-end in sequence to form a circulation loop. The variable frequency pump is connected in series with the plate heat exchanger. The first valve is connected to the output pipe upstream of the plate heat exchanger, and the second valve is connected to the return pipe downstream of the plate heat exchanger. The measuring circuit is connected in parallel with the plate heat exchanger for measuring the pressure difference of the plate heat exchanger.

[0007] The inlet end of the plate heat exchanger is detachably connected to the outlet pipe, and the outlet end of the plate heat exchanger is detachably connected to the return pipe, so as to replace plate heat exchangers with different corrugation depths.

[0008] The water storage tank is equipped with a feeding port for adding experimental sources to simulate marine biological environments.

[0009] In some embodiments, the measurement circuit includes a measurement pipe, a pressure gauge, a third valve, and a fourth valve, wherein the third valve, the pressure gauge, and the fourth valve are connected in series on the measurement pipe; a first end of the measurement pipe is connected to the output pipe between the first valve and the plate heat exchanger, and a second end of the measurement pipe is connected to the return pipe between the plate heat exchanger and the second valve.

[0010] In some embodiments, the system further includes a shellfish trap, a bypass pipeline, a fifth valve, and a sixth valve. The shellfish trap is detachably connected to the output pipeline upstream of the first valve, and the fifth valve is connected to the output pipeline upstream of the shellfish trap. The bypass pipeline is arranged in parallel with the shellfish trap, with a first end connected to the output pipeline upstream of the fifth valve and a second end connected between the shellfish trap and the first valve. The sixth valve is connected in series on the bypass pipeline.

[0011] One of the fifth valve and the sixth valve is open, while the other of the fifth valve and the sixth valve is closed.

[0012] In some embodiments, a seventh valve is further included, which is connected in series between the shellfish trap and the first valve.

[0013] In some embodiments, a sampling tube and an eighth valve are also included, wherein the sampling tube is connected to the output pipe for sampling, and the eighth valve is connected to the sampling tube.

[0014] In some embodiments, the water storage tank is further provided with an inlet, an outlet and a return outlet. The inlet is connected to an external water source, the outlet is connected to the output pipe, and the return outlet is connected to the return pipe. The outlet is located below the return outlet.

[0015] In some embodiments, the variable frequency pump is connected in series with the output pipe.

[0016] In some embodiments, a ninth valve and a tenth valve are also included, the ninth valve and the tenth valve being respectively connected to both ends of the variable frequency pump.

[0017] In some embodiments, the rated flow rate of the variable frequency pump is greater than 460,000 kg / h to simulate the dual-pump operation of a nuclear power plant.

[0018] In some embodiments, the plate heat exchanger is connected to the output pipe and the return pipe via a flange connection, a compression fitting connection, or a clamp connection; and / or, the shellfish trap is connected to the output pipe via a flange connection, a compression fitting connection, or a clamp connection.

[0019] By implementing this utility model, the following beneficial effects can be achieved:

[0020] This utility model discloses a test device for the corrugation depth of a plate heat exchanger in a nuclear power plant, comprising a water storage tank, an output pipe, a variable frequency pump, a plate heat exchanger, a first valve, a second valve, a measuring circuit, and a return pipe. The water storage tank, the output pipe, the plate heat exchanger, and the return pipe are connected end-to-end to form a circulation loop. The variable frequency pump is connected in series with the plate heat exchanger. The first valve is connected to the output pipe upstream of the plate heat exchanger, and the second valve is connected to the return pipe downstream of the plate heat exchanger. The measuring circuit is connected in parallel with the plate heat exchanger for measuring the pressure difference of the plate heat exchanger. The inlet end of the plate heat exchanger is detachably connected to the output pipe, and the outlet end of the plate heat exchanger is detachably connected to the return pipe, for replacing plate heat exchangers with different corrugation depths. The water storage tank is provided with a feeding port for introducing test sources to simulate a marine biological environment. The feed inlet allows for the introduction of experimental sources to simulate a marine environment, enabling experiments on the passage of marine organisms through the plate heat exchanger. The measurement loop measures the pressure difference between the upstream and downstream sides of the plate heat exchanger, serving as a basis for subsequent plate heat exchanger selection. The entire system is used to test the flow performance of plate heat exchangers with different corrugation depths. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a nuclear power plant plate heat exchanger corrugation depth testing device according to an embodiment of this utility model. Detailed Implementation

[0023] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] See Figure 1 This utility model discloses an embodiment of a plate heat exchanger corrugation depth testing device for nuclear power plants, comprising a water storage tank 1, an output pipe 2, a variable frequency pump 3, a plate heat exchanger 4, a first valve D1, a second valve D2, a measuring circuit 5, and a return pipe 6. The water storage tank 1, output pipe 2, plate heat exchanger 4, and return pipe 6 are connected end-to-end to form a circulation loop. The variable frequency pump 3 is connected in series with the plate heat exchanger 4. The first valve D1 is connected to the output pipe 2 upstream of the plate heat exchanger 4, and the second valve D2 is connected to the return pipe 6 downstream of the plate heat exchanger 4. The measuring circuit 5 is connected in parallel with the plate heat exchanger 4 to measure the pressure difference of the plate heat exchanger 4. The inlet end of the plate heat exchanger 4 is detachably connected to the output pipe 2, and the outlet end of the plate heat exchanger 4 is detachably connected to the return pipe 6, for replacing plate heat exchangers 4 with different corrugation depths. The water storage tank 1 is provided with a feeding port 11 for introducing test sources to simulate a marine biological environment. Normally, the first valve D1 and the second valve D2 are in the open state. When it is necessary to cut off the flow path, the first valve D1 and the second valve D2 are in the closed state, for example, when the plate heat exchanger 4 needs to be replaced.

[0028] The water storage tank 1 is used to store water and provide water for the experiment. After the test source is added to the water storage tank 1 through the feeding port 11, the water is mixed to simulate the seawater environment. The test source is used to simulate marine organisms. The test source can be real marine organisms or non-biological substances similar to marine organisms, such as adding pen cap snails as a simulation. The specific settings are set according to actual needs.

[0029] Variable frequency pump 3 is used to provide power for the entire system's circulation. Variable frequency pump 3 is connected in series with output pipe 2. Alternatively, variable frequency pump 3 can also be connected in series with return pipe 6. This utility model's nuclear power plant plate heat exchanger corrugation depth test device references the actual flow rate of the nuclear power plant's important plant water system (SEC). Based on geometric similarity, the test device is modeled at a scale of 1:5. Variable frequency pump 3 is selected according to 1.5 times the maximum flow rate after modeling, covering 0-150% of the rated flow rate. That is, the maximum flow rate of variable frequency pump 3 is at least 1.5 times the rated flow rate of the reference nuclear power plant's modeled system, covering the dual-pump operation condition of the reference nuclear power plant's SEC system. For example, the rated flow rate of variable frequency pump 3 is greater than 460,000 kg / h to simulate the dual-pump operation condition of a nuclear power plant.

[0030] Plate heat exchanger 4 was originally used to transfer heat from the nuclear island equipment to seawater. In this experimental setup, it is used to transfer water without applying actual heat. As the main measuring device in this experimental setup, plate heat exchanger 4's parameters are designed according to those of a reference power plant. It should be easily disassembled; for example, plate heat exchanger 4 can be connected to the output pipe 2 and the return pipe 6 via flange connections, compression fittings, or clamps. This facilitates the replacement of plate heat exchanger 4 and the exploration of its clogging patterns, providing support for optimizing the structural design of plate heat exchanger 4. During the test, the prepared plate heat exchanger 4 (the selection of plate heat exchanger 4 mainly depends on the corrugation depth of the plates, specifically selected according to actual needs) will be used. For example, plate heat exchanger 4 can be selected with a corrugation depth of 3.8mm / 4.6mm. By testing various types of plate heat exchanger 4, the optimal one can be selected through comparison.

[0031] Measurement loop 5 is used to measure the pressure difference of plate heat exchanger 4. This pressure difference refers to the difference between the pressure at the inlet end of plate heat exchanger 4 and the pressure at the outlet end. The pressure difference can indicate the degree of blockage in plate heat exchanger 4. The larger the pressure difference, the more severe the blockage in plate heat exchanger 4.

[0032] This utility model's nuclear power plant plate heat exchanger corrugation depth testing device can be used to test the flow performance of plate heat exchangers 4 with different corrugation depths. Based on the test results, such as the pressure difference of the plate heat exchanger 4, the clogging characteristics of the plate heat exchanger 4 at different corrugation depths can be studied, providing a basis for the structural optimization and improvement of the plate heat exchanger 4. Furthermore, based on the flow performance of plate heat exchangers 4 with different corrugation depths, an analysis and improvement plan for the actual anti-clogging capability of the critical plant water system SEC can be formulated, along with an optimization plan for the configuration of the cold source control system, thus determining the selection of the plate heat exchanger 4.

[0033] In some embodiments, the measurement circuit 5 includes a measurement pipe 51, a pressure gauge 52, a third valve D3, and a fourth valve D4, which are connected in series on the measurement pipe 51. The first end of the measurement pipe 51 is connected to the output pipe 2 between the first valve D1 and the plate heat exchanger 4, and the second end of the measurement pipe 51 is connected to the return pipe 6 between the plate heat exchanger 4 and the second valve D2. The pressure gauge 52's range should be sufficient for measuring the pressure difference at the maximum test concentration. For example, the maximum head of the variable frequency pump 3 can be selected. Normally, the third valve D3 and the fourth valve D4 are normally open. When it is necessary to cut off the flow path, the third valve D3 and the fourth valve D4 are closed, for example, when the pressure gauge 52 needs to be replaced.

[0034] In some embodiments, the nuclear power plant plate heat exchanger corrugation depth testing device further includes a shellfish trap 7, a bypass pipe 8, a fifth valve D5, and a sixth valve D6. The shellfish trap 7 is detachably connected to the output pipe 2 upstream of the first valve D1, and the fifth valve D5 is connected to the output pipe 2 upstream of the shellfish trap 7. The bypass pipe 8 is arranged in parallel with the shellfish trap 7, with its first end connected to the output pipe 2 upstream of the fifth valve D5 and its second end connected between the shellfish trap 7 and the first valve D1. The sixth valve D6 is connected in series with the bypass pipe 8. One of the fifth valve D5 and the sixth valve D6 is open, while the other is closed. By adding the shellfish trap 7, the bypass pipe 8, the fifth valve D5, and the sixth valve D6, the nuclear power plant plate heat exchanger corrugation depth testing device can achieve dual-purpose functionality, improving the device's utilization rate. With the fifth valve D5 open and the sixth valve D6 closed, this can be used for combined testing of the plate heat exchanger 4 and the shellfish trap 7. With the sixth valve D6 open and the fifth valve D5 closed, water reaches the plate heat exchanger 4 through the bypass pipe 8, which can be used for individual testing of the plate heat exchanger 4.

[0035] The type of shellfish trap 7 is selected for testing based on actual needs, such as a combination test of spherical and cylindrical shellfish traps. The shellfish trap 7 can be either spherical (2mm / 3mm filter aperture) or cylindrical (2mm / 3mm). The shellfish trap 7 and the plate heat exchanger 4 can be arranged and combined arbitrarily; the types of plate heat exchanger 4 are described above.

[0036] The shellfish trap 7 is designed with power plant specifications in mind, and its interfaces are designed for easy replacement. For example, the shellfish trap 7 is connected to the output pipe 2 via flange, compression fitting, or clamp. This facilitates combination tests between the plate heat exchanger 4 and different types of shellfish traps 7 to determine the optimal matching scheme. Normally, when it is necessary to cut off the flow path, the fifth valve D5, the sixth valve D6, and the first valve D1 are all closed, allowing for replacement of the shellfish trap 7.

[0037] In some embodiments, the nuclear power plant plate heat exchanger corrugation depth testing device further includes a seventh valve D7, which is connected in series between the shellfish trap 7 and the first valve D1. Normally, the seventh valve D7 is in the open state. When it is necessary to cut off the flow path, the fifth valve D5, the sixth valve D6, and the seventh valve D7 are all in the closed state, which can be used to replace the shellfish trap 7.

[0038] In some embodiments, the nuclear power plant plate heat exchanger corrugation depth testing device further includes a sampling pipe 9 and an eighth valve D8. The sampling pipe 9 is connected to the output pipe 2 for sampling, and the eighth valve D8 is connected to the sampling pipe 9. Sampling analysis through the sampling loop ensures that the test source is uniformly distributed in the water, guaranteeing the reliability of the data from the measurement loop 5. If the sampling reveals uneven distribution of the test source, the data from the measurement loop 5 is unusable, and the device must be run continuously for repeated sampling until the test source is uniformly distributed in the water before the data from the measurement loop 5 becomes usable.

[0039] In some embodiments, the water storage tank 1 is further provided with an inlet, an outlet, and a return outlet. The inlet is connected to an external water source, the outlet is connected to the output pipe 2, and the return outlet is connected to the return pipe 6. The outlet is located below the return outlet. The inlet is used for initial water storage and subsequent replenishment of losses. The water storage tank 1 meets the net positive suction head of the variable frequency pump 3, ensuring the total water volume of the device. The liquid level in the water storage tank 1 is greater than the net positive suction head (NPSH) of the variable frequency pump 3. Understandably, to simplify the structure, the feed port 11 can also be used for initial water storage and subsequent replenishment of losses. To facilitate the addition of test sources, the feed port 11 is located at the top of the water storage tank 1. The inlet is located at the top or upper-middle part of the water storage tank 1, the outlet is located at the bottom of the water storage tank 1, and the return outlet is located on the side of the water storage tank 1. The inlet, outlet, and return outlet are not shown in the figure.

[0040] In some embodiments, the nuclear power plant plate heat exchanger corrugation depth testing device further includes a ninth valve D9 and a tenth valve D10, which are respectively connected to the two ends of the variable frequency pump 3. Normally, the ninth valve D9 and the tenth valve D10 are in a normally open state. When it is necessary to cut off the flow path, the ninth valve D9 and the tenth valve D10 are in a closed state, for example, when the variable frequency pump 3 needs to be replaced.

[0041] This utility model discloses a corrugation depth testing device for nuclear power plant plate heat exchangers. When used for individual flow performance testing of plate heat exchanger 4, valves D1, D2, D3, D4, D6, D7, D9, and D10 are normally open, while valves D5 and D8 are closed. When used for combined testing of plate heat exchanger 4 and shellfish trap 7, valves D1, D2, D3, D4, D5, D7, D9, and D10 are normally open, while valves D6 and D8 are closed. Valve D1 through D10 can be either solenoid valves or manual valves; this utility model does not impose any limitations on this.

[0042] By implementing this utility model, the following beneficial effects can be achieved:

[0043] This utility model discloses a test device for the corrugation depth of a plate heat exchanger in a nuclear power plant. A test source simulating a marine biological environment can be introduced through the feed port 11 to conduct a marine biological passage test on the plate heat exchanger 4. The measurement circuit 5 can measure the upstream and downstream pressure difference of the plate heat exchanger 4, serving as a basis for subsequent selection of the plate heat exchanger 4. The entire device is used to test the flow performance of plate heat exchangers 4 with different corrugation depths.

[0044] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model, that is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A test device for corrugation depth of plate heat exchangers in nuclear power plants, characterized in that, The system includes a water storage tank (1), an output pipe (2), a variable frequency pump (3), a plate heat exchanger (4), a first valve (D1), a second valve (D2), a measuring circuit (5), and a return pipe (6). The water storage tank (1), the output pipe (2), the plate heat exchanger (4), and the return pipe (6) are connected end to end in sequence to form a circulation loop. The variable frequency pump (3) is connected in series with the plate heat exchanger (4). The first valve (D1) is connected to the output pipe (2) upstream of the plate heat exchanger (4), and the second valve (D2) is connected to the return pipe (6) downstream of the plate heat exchanger (4). The measuring circuit (5) is connected in parallel with the plate heat exchanger (4) and is used to measure the pressure difference of the plate heat exchanger (4). The inlet end of the plate heat exchanger (4) is detachably connected to the outlet pipe (2), and the outlet end of the plate heat exchanger (4) is detachably connected to the return pipe (6) to replace the plate heat exchanger (4) with different corrugation depths. The water storage tank (1) is equipped with a feeding port (11) for feeding experimental sources to simulate marine biological environments.

2. The test device for corrugation depth of plate heat exchangers in nuclear power plants according to claim 1, characterized in that, The measurement circuit (5) includes a measurement pipe (51), a pressure gauge (52), a third valve (D3), and a fourth valve (D4). The third valve (D3), the pressure gauge (52), and the fourth valve (D4) are connected in series on the measurement pipe (51). The first end of the measurement pipe (51) is connected to the output pipe (2) between the first valve (D1) and the plate heat exchanger (4), and the second end of the measurement pipe (51) is connected to the return pipe (6) between the plate heat exchanger (4) and the second valve (D2).

3. The test device for corrugation depth of plate heat exchangers in nuclear power plants according to claim 1, characterized in that, It also includes a shellfish trap (7), a bypass pipe (8), a fifth valve (D5), and a sixth valve (D6). The shellfish trap (7) is detachably connected to the output pipe (2) upstream of the first valve (D1), and the fifth valve (D5) is connected to the output pipe (2) upstream of the shellfish trap (7). The bypass pipe (8) is arranged in parallel with the shellfish trap (7). The first end of the bypass pipe (8) is connected to the output pipe (2) upstream of the fifth valve (D5), and the second end of the bypass pipe (8) is connected between the shellfish trap (7) and the first valve (D1). The sixth valve (D6) is connected in series with the bypass pipe (8). One of the fifth valve (D5) and the sixth valve (D6) is open, while the other of the fifth valve (D5) and the sixth valve (D6) is closed.

4. The test device for corrugation depth of plate heat exchangers in nuclear power plants according to claim 3, characterized in that, It also includes a seventh valve (D7), which is connected in series between the shellfish trap (7) and the first valve (D1).

5. The test apparatus for corrugation depth of plate heat exchangers in nuclear power plants according to any one of claims 1-4, characterized in that, It also includes a sampling tube (9) and an eighth valve (D8), wherein the sampling tube (9) is connected to the output pipe (2) for sampling, and the eighth valve (D8) is connected to the sampling tube (9).

6. The test apparatus for corrugation depth of plate heat exchangers in nuclear power plants according to any one of claims 1-4, characterized in that, The water storage tank (1) is also provided with an inlet, an outlet and a return outlet. The inlet is connected to an external water source, the outlet is connected to the output pipe (2), and the return outlet is connected to the return pipe (6). The outlet is located below the return outlet.

7. The test apparatus for corrugation depth of plate heat exchangers in nuclear power plants according to any one of claims 1-4, characterized in that, The variable frequency pump (3) is connected in series with the output pipe (2).

8. The test apparatus for corrugation depth of plate heat exchangers in nuclear power plants according to any one of claims 1-4, characterized in that, It also includes a ninth valve (D9) and a tenth valve (D10), which are respectively connected to the two ends of the variable frequency pump (3).

9. The test apparatus for corrugation depth of plate heat exchangers in nuclear power plants according to any one of claims 1-4, characterized in that, The rated flow rate of the variable frequency pump (3) is greater than 460,000 kg / h to simulate the operation of a dual pump in a nuclear power plant.

10. The test device for corrugation depth of plate heat exchangers in nuclear power plants according to claim 3 or 4, characterized in that, The plate heat exchanger (4) is connected to the output pipe (2) and the return pipe (6) by flange connection, compression fitting connection or clamp connection; and / or, the shellfish trap (7) is connected to the output pipe (2) by flange connection, compression fitting connection or clamp connection.

Images