Cooling-tower performance testing device and method

Abstract

A cooling-tower performance testing device, comprising: a first barrier member (11) arranged on a water output pipeline of an RIS-RHR heat exchanger (21); a heat-source obtaining assembly (12), which has a first end mechanically connected between the first barrier member (11) and a water outlet of the RIS-RHR heat exchanger (21) and a second end mechanically connected to an EHR gate valve (31); and a second barrier member (13), which is arranged on a pipeline connected between a water outlet of a PTR heat exchanger (51) and a hot-side water inlet of an ECS heat exchanger (41). The device enables an ECS to obtain a stable heat source from one loop, and supplies heat to the ECS heat exchanger (41), and a heat source is thus provided for carrying out a cooling-tower performance test, without temporarily laying a large number of pipelines, thereby omitting a large amount of pipeline disassembly and site restoration work, and also effectively shortening a test duration and reducing test costs. Further provided is a cooling-tower performance testing method.

Description

Cooling tower performance test device and method TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling tower performance test, in particular to a cooling tower performance test device and method. BACKGROUND

[0002] The ECS system is one of the important systems for maintaining the safe operation of a nuclear power plant, and the anti-seismic mechanical ventilation cooling tower (referred to as the cooling tower) in the ECS system is an important equipment for heat dissipation. In order to ensure the reliability of the ECS system, the performance of the cooling tower needs to be tested periodically to verify whether the performance of the cooling tower meets the safety standards.

[0003] In the related art, the heat source required for the cooling tower performance test mainly includes the following schemes: 1. Using auxiliary steam distribution system heating, by installing temporary heat exchanger, pipeline and water circulation loop, the heat source is introduced to the cooling tower, which requires purchasing new temporary heat exchanger, resulting in high test cost, and long time for disassembling the pipeline and restoring the site before and after the test; 2. Using auxiliary steam distribution system steam heating, by laying temporary pipeline, steam is introduced to the heat exchanger of the waste liquid treatment system to heat the water in the temporary circulation loop, and then the hot water is introduced to the cooling tower, which not only affects the debugging of the waste liquid treatment system, but also affects the cleanliness of the heat exchanger of the waste liquid treatment system after the test, and the disassembly of the pipeline and the restoration of the site before and after the test takes a long time; 3. The method of 1:1 model test outside the plant is used to simulate the cooling tower performance test, which has the defects of high test cost and long total test period.

[0004] At present, a cooling tower performance test execution scheme with low cost, short time consumption and no influence on the operation of other systems is urgently needed in nuclear power plants. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a cooling tower performance test device and method.

[0006] The technical scheme adopted by the present application to solve the technical problem is: a cooling tower performance test device is constructed, comprising:

[0007] A first barrier is arranged on the outlet pipeline of the RIS-RHR heat exchanger, and is used to block the cooling water heated by the RIS-RHR heat exchanger from being transported to the pipeline at the rear stage of the outlet pipeline of the RIS-RHR heat exchanger during the performance test;

[0008] a heat source acquisition assembly, having a first end mechanically connected between the first barrier and a water outlet of the RIS-RHR heat exchanger, and a second end mechanically connected to the EHR gate valve, for acquiring the cooling water output by the RIS-RHR heat exchanger during the performance test, so that the cooling water is delivered to the hot-side water inlet of the ECS heat exchanger through a water outlet pipeline of the EHR gate valve; and

[0009] a second barrier, arranged on a pipeline connected between a water outlet of the PTR heat exchanger and the hot-side water inlet of the ECS heat exchanger, for blocking the backflow of the cooling water to the water outlet of the PTR heat exchanger during the performance test.

[0010] Preferably, the heat source acquisition assembly comprises:

[0011] a first valve, having a first end mechanically connected between the first barrier and the water outlet of the RIS-RHR heat exchanger, and a second end mechanically connected to a valve core outlet of the EHR gate valve.

[0012] Preferably, the first end of the first valve is mechanically connected to a valve core outlet of a RIS check valve arranged between the first barrier and the water outlet of the RIS-RHR heat exchanger.

[0013] Preferably, the heat source acquisition assembly further comprises a second valve; the second end of the first valve is mechanically connected to the valve core outlet of the EHR gate valve through the second valve.

[0014] The cooling tower performance test device further comprises:

[0015] a third barrier, detachably installed in an EHR flow limiting orifice plate, for blocking the cooling water of the ECS loop from flowing back to the hot-side water inlet of the ECS heat exchanger through the EHR heat exchanger during the performance test; and

[0016] a fourth barrier, arranged on a water outlet pipeline of the EHR flow limiting orifice plate, for blocking the backflow of the cooling water to the RRI main pump inlet through the water inlet of the EHR gate valve during the performance test.

[0017] Preferably, the first valve and the second valve are mechanically connected through a DN300 pipeline.

[0018] Preferably, the third barrier is a blind plate; and / or the first barrier, the second barrier and the fourth barrier are electric valves.

[0019] Preferably, the first valve and the second valve are respectively flange valves.

[0020] Preferably, the cooling tower performance test device further comprises:

[0021] A fifth barrier is arranged between the sixth valve and the first EHR water inlet valve, for blocking the backflow of cooling water output by the hot side water outlet of the ECS heat exchanger to the water outlet of the RRI heat exchanger during performance test, so that the cooling water is backflowed to the water inlet of the RRI main pump through the PTR heat exchanger and the PTR water outlet valve.

[0022] The application also provides a cooling tower performance test method, comprising the following steps:

[0023] S10, constructing a heat transfer path for providing heat source required by performance test of the ECS cooling tower by the cooling tower performance test device described above;

[0024] S20, setting the running state of the cooling tower;

[0025] S30, controlling the inlet water temperature of the cooling tower by controlling the running state of the RIS system and / or the water temperature of the primary loop;

[0026] S40, obtaining the measured working condition data of the cooling tower;

[0027] S50, analyzing the measured working condition data and outputting the test result of the cooling tower.

[0028] Preferably, the control of the inlet water temperature of the cooling tower comprises controlling the inlet water temperature to be between 52.7℃ and 54.51℃.

[0029] Preferably, the setting of the running state of the cooling tower comprises:

[0030] setting the circulating water amount and the baffle state of the cooling tower; wherein the setting range of the circulating water amount is 270t / h-330t / h, and the baffle state is with or without the baffle.

[0031] Preferably, the measured working condition data comprises the ambient dry-bulb temperature, the ambient wet-bulb temperature, the atmospheric pressure, the measured circulating water flow, the inlet water temperature and the outlet water temperature.

[0032] The analysis of the measured working condition data comprises:

[0033] calculating a calculated water temperature difference according to the ambient dry-bulb temperature, the ambient wet-bulb temperature, the atmospheric pressure, the measured circulating water flow and the inlet water temperature.

[0034] calculating a cooling capacity coefficient for evaluating the actual cooling capacity of the cooling tower according to the calculated water temperature difference, the inlet water temperature and the outlet water temperature.

[0035] Preferably, the measured operating condition data further comprises inlet air flow, inlet dry bulb temperature, inlet wet bulb temperature, outlet dry bulb temperature and outlet wet bulb temperature;

[0036] The analyzing the measured operating condition data further comprises:

[0037] A heat balance error for evaluating the heat balance performance of the cooling tower is calculated according to the inlet air flow, the inlet dry bulb temperature, the inlet wet bulb temperature, the measured circulating water flow, the outlet dry bulb temperature and the outlet wet bulb temperature.

[0038] Preferably, the analyzing the measured operating condition data further comprises:

[0039] A cooling number for evaluating the cooling performance of the cooling tower is calculated according to the inlet water temperature, the outlet water temperature, the inlet air flow, the inlet dry bulb temperature, the inlet wet bulb temperature, the outlet dry bulb temperature and the outlet wet bulb temperature.

[0040] Preferably, the measured operating condition data further comprises cooling tower water spray packing volume;

[0041] The analyzing the measured operating condition data further comprises:

[0042] A volumetric mass transfer coefficient of the cooling tower is calculated according to the measured circulating water flow, the cooling tower water spray packing volume and the cooling number.

[0043] Preferably, the measured operating condition data further comprises water spray density, N groups of water drift data collected by filter paper weighing method, and filter paper area; wherein each group of the water drift data comprises filter paper weight before collecting each water droplet, filter paper weight after collecting each water droplet, sampling time of collecting each water droplet and water drift amount of collecting each water droplet;

[0044] The analyzing the measured operating condition data further comprises:

[0045] A water drift rate of the cooling tower is calculated according to the water spray density, the filter paper area and N groups of the water drift data.

[0046] Preferably, the measured operating condition data further comprises fan inlet cross-section pressure, fan outlet cross-section pressure, packing bottom cross-section pressure, packing upper cross-section pressure, water separator cross-section pressure, cooling tower outlet cross-section pressure and outlet water temperature cross-section pressure;

[0047] The analyzing the measured operating condition data further comprises:

[0048] The resistance of each component of the cooling tower is calculated in sequence according to the fan inlet section pressure, the fan outlet section pressure, the filler bottom section pressure, the filler upper section pressure, the water separator section pressure, the cooling tower outlet section pressure and the tower outlet water temperature section pressure.

[0049] Preferably, the cooling tower performance test method further comprises:

[0050] S60, judging whether the test items in the predetermined test items have been all tested, if yes, ending the test, otherwise, resetting the operation state of the cooling tower based on the uncompleted test items in the predetermined test items, and returning to the S30.

[0051] The present application has the following beneficial effects: the cooling tower performance test device can obtain stable heat source from a loop of the ECS system to supply heat to the ECS cooling tower, thereby providing continuous and stable heat source for the cooling tower performance test, and without temporarily laying a large number of pipelines during the test process, which not only saves a large amount of pipeline dismounting and on-site recovery work, but also effectively avoids affecting the joint test of other systems, can effectively shorten the main line construction period and reduce the test cost. BRIEF DESCRIPTION OF DRAWINGS

[0052] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0053] Fig. 1 is a structural schematic diagram of various heat exchange systems in a certain nuclear power plant according to the present application;

[0054] Fig. 2 is a structural schematic diagram of a cooling tower performance test device in some embodiments of the present application;

[0055] Fig. 3 is a position diagram of a cooling tower in a certain nuclear power plant at different test sections;

[0056] Fig. 4 is a program flow diagram of a cooling tower performance test method in some embodiments of the present application. DETAILED DESCRIPTION

[0057] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0058] In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical solutions, and cannot be understood as indicating that the devices or elements referred to must have a particular direction, therefore, it cannot be understood as a limitation on the present application.

[0059] It should be noted that the present application is applied to a nuclear power plant, and the nuclear power plant is provided with various heat exchange systems, including an RRI system (i.e. a reactor coolant system), an RIS system (i.e. a safety injection system), an ECS system (i.e. an emergency core cooling system), a PTR system (i.e. a fuel pool cooling and purification system), an EHR system (i.e. an ex containment heat removal system), and the like.

[0060] Referring to FIG. 1, the RRI system includes an RRI pump motor 63, two rows of RRI heat exchangers 61, two rows of RRI main pumps 62, and a plurality of third valves 64 provided on a cooling water pipeline of the RRI system, and the connection structure between the components in the RRI system can be referred to FIG. 1, and the working principle of the RRI system can be referred to the prior art, which will not be described here.

[0061] The RIS system includes an RIS-RHR heat exchanger 21, an RIS check valve 22, and a fourth valve 23, and the connection structure between the components in the RIS system can be referred to FIG. 1, and the working principle thereof can be referred to the prior art, which will not be described here.

[0062] The ECS system includes an ECS heat exchanger 41, an ECS intermediate loop circulating pump 43, a pressurized tank 44, an ECS terminal loop check valve 45, an ECS terminal loop circulating pump 46, a cooling tower 47, and a plurality of fifth valves 42, and the connection structure between the components in the ECS system can be referred to FIG. 1, and the working principle thereof for heat dissipation by using the cooling tower 47 can be referred to the prior art, which will not be described here.

[0063] The PTR system includes a PTR heat exchanger 51, a first PTR water inlet valve 52, a PTR water outlet valve 53, and a second PTR water inlet valve 54, and the connection structure between the components in the PTR system can be referred to FIG. 1, and the working principle thereof can be referred to the prior art, which will not be described here.

[0064] The EHR system includes an EHR gate valve 31, an EHR flow limiting orifice plate 32, an EHR heat exchanger 33, a first EHR water inlet valve 34, and a second EHR water inlet valve 35, and the connection structure between the components in the PTR system can be referred to FIG. 1, and the working principle thereof can be referred to the prior art, which will not be described here.

[0065] Referring to FIG. 1, the various heat exchange systems are further provided with a common user device 81 (a device for taking heat from a primary loop and running), a sixth valve 82, and a seventh valve 83, and the connection structure between the common user device 81, the sixth valve 82, and the seventh valve 83 and the various heat exchange systems can be referred to FIG. 1, which will not be described here.

[0066] Figure 2 is a structural schematic diagram of a cooling tower performance test device in some embodiments of the present application. The system can enable the ECS system to obtain a stable heat source from a loop to supply heat to the ECS cooling tower 47, thereby providing a continuous and stable heat source for the performance test of the cooling tower, and without the need for temporary laying of a large number of pipelines during the test, which not only saves a large amount of pipeline disassembly and on-site recovery work, but also effectively avoids the impact on the joint test of other systems, can effectively shorten the test period and reduce the test cost. As shown in Figure 1, the cooling tower performance test device includes a first blocking piece 11, a heat source obtaining assembly 12, and a second blocking piece 13.

[0067] The first blocking piece 11 is arranged on the outlet pipeline of the RIS-RHR heat exchanger 21. The first blocking piece 11 is used to block the cooled water heated by the RIS-RHR heat exchanger 21 from being transported to the downstream pipeline of the outlet pipeline of the RIS-RHR heat exchanger 21 during the performance test. Specifically, the first blocking piece 11 is closed during the performance test, so that the cooled water is blocked from being transported to the downstream pipeline of the outlet pipeline of the RIS-RHR heat exchanger 21, so that the cooled water output by the RIS-RHR heat exchanger 21 only flows to the heat source obtaining assembly 12.

[0068] The first end of the heat source obtaining assembly 12 is mechanically connected between the first blocking piece 11 and the outlet of the RIS-RHR heat exchanger 21, and the second end of the heat source obtaining assembly 12 is mechanically connected to the valve core outlet of the EHR gate valve 31. The heat source obtaining assembly 12 is used to obtain the cooled water output by the RIS-RHR heat exchanger 21 during the performance test, so that the cooled water is transported to the hot side inlet of the ECS heat exchanger 41 through the outlet pipeline of the EHR gate valve 31. Specifically, the first end of the heat source obtaining assembly 12 is mechanically connected between the inlet of the first blocking piece 11 and the outlet of the RIS-RHR heat exchanger 21, so that after the first blocking piece 11 is closed, the cooled water can only flow into the heat source obtaining assembly 12, and the second end of the heat source obtaining assembly 12 is mechanically connected to the EHR gate valve 31, so that the cooled water flows to the EHR gate valve 31 through the heat source obtaining assembly 12, and then the cooled water is transported to the hot side inlet of the ECS heat exchanger 41 through the outlet pipeline of the EHR gate valve 31, and then the heat is transferred to the cold side of the ECS heat exchanger 41, and the ECS terminal loop circulating pump 46 drives the hot water on the cold side of the ECS heat exchanger 41 to flow, so that the cooling tower obtains the heat required for the performance test.

[0069] The second blocking piece 13 is arranged on a pipeline connecting the outlet of the PTR heat exchanger 51 and the hot-side inlet of the ECS heat exchanger 41. The second blocking piece 13 is used to block the backflow of cooling water to the outlet of the PTR heat exchanger 51 during the thermal performance test. Specifically, the first blocking piece 11 is closed during the performance test, so that the backflow of hot water input to the hot-side inlet of the ECS heat exchanger 41 to the outlet of the PTR heat exchanger 51 is blocked, so as to avoid the heat input to the cooling tower being shunted, thereby ensuring that there is enough heat to implement the cooling tower performance test.

[0070] The present embodiment has relatively small modification workload on the existing heat exchange system, and only a small number of components are arranged to enable the hot side of the ECS heat exchanger 41 to obtain hot water with a suitable temperature from the RRI system, thereby enabling the cooling tower to obtain a stable heat source required for the performance test. This not only effectively shortens the test period, but also reduces the test cost.

[0071] In some embodiments, as shown in FIG. 2, the heat source acquisition assembly 12 includes a first valve 121. A first end of the first valve 121 is mechanically connected between the first blocking piece 11 and the outlet of the RIS-RHR heat exchanger 21, and a second end of the first valve 121 is mechanically connected to the EHR gate valve 31. The first valve 121 is used to controllably turn on and off the water flow of the heat source acquisition assembly 12.

[0072] In some embodiments, the first end of the first valve 121 is mechanically connected to the valve core outlet of the RIS check valve 22, and the RIS check valve 22 is arranged on the outlet pipeline between the first blocking piece 11 and the outlet of the RIS-RHR heat exchanger 21.

[0073] Specifically, the first valve 121 can be a flange valve. Before the heat source acquisition assembly 12 is installed, the valve core of the RIS check valve 22 can be removed, so that the first valve 121 and the valve core outlet of the RIS check valve 22 can be directly mechanically connected through flanges. That is, the present embodiment does not need to cut and weld the pipeline between the first blocking piece 11 and the outlet of the RIS-RHR heat exchanger 21, so as to obtain cooling water from the outlet of the RIS-RHR heat exchanger 21. This not only reduces the workload required for disassembly, modification and on-site recovery of the pipeline, but also ensures the integrity of the outlet pipeline of the RIS-RHR heat exchanger 21, so as to minimize the impact of the performance test on the RIS system, thereby helping to ensure the stability and reliability of the RIS system.

[0074] In some embodiments, as shown in FIG. 2, the heat source acquisition assembly 12 further comprises a second valve 122, and the cooling tower performance test device further comprises a third blocking member 17 and a fourth blocking member 14. The second end of the first valve 121 is mechanically connected to the spool outlet of the EHR gate valve 31 through the second valve 122; the third blocking member 17 is detachably installed in the EHR orifice plate 32, and the third blocking member 17 is used to be closed during the performance test to block the cooling water of the ECS loop from flowing back to the hot side inlet of the ECS heat exchanger 41 through the EHR heat exchanger 33; the fourth blocking member 14 is arranged on the outlet pipeline of the EHR orifice plate 32, and the fourth blocking member 14 is used to be closed during the performance test to block the cooling water from flowing back to the inlet of the RRI main pump 62 through the inlet of the EHR gate valve 31.

[0075] Specifically, the second valve 122 can be a flange valve, and the spool of the EHR gate valve 31 can be removed before the heat source acquisition assembly 12 is installed, so that the second valve 122 and the spool outlet of the EHR gate valve 31 can be directly mechanically connected through flanges, i.e. without cutting, welding and other processes on the pipeline, so that the cooling water in the heat source acquisition assembly 12 is input into the EHR gate valve 31, further ensuring the integrity of the pipeline in the existing heat exchange system; then, in order to avoid the cooling water in the heat source acquisition assembly 12 from flowing back to the EHR heat exchanger 33 and the outlet pipeline of the EHR orifice plate 32 through the inlet of the EHR gate valve 31, in this embodiment, during the performance test, on the one hand, the EHR orifice plate 32 is blocked by the third blocking member 17, so that the cooling water of the ECS loop is prevented from flowing back to the hot side inlet of the ECS heat exchanger 41 through the EHR heat exchanger 33, and on the other hand, the fourth blocking member 14 is closed to prevent the cooling water from flowing back to the inlet of the RRI main pump 62. In addition, it should be noted that in a nuclear power plant, the RIS check valve 22 and the EHR gate valve 31 are generally installed in the same room, so the heat source acquisition assembly 12 can be installed in the same room, which helps to shorten the pipeline between the first valve 121 and the second valve 122, and provides great convenience for temporarily laying the heat source acquisition assembly 12.

[0076] Optionally, the third blocking member 17 is a blind plate.

[0077] In order to avoid the cooling water flowing into the heat source acquisition assembly 12 being affected due to the small diameter of the pipeline, in some examples, the first valve 121 and the second valve 122 can be mechanically connected through a DN300 pipeline.

[0078] In some embodiments, as shown in FIG. 2, the cooling tower performance test device further comprises a fifth barrier 15. The fifth barrier 15 is arranged between the sixth valve 82 and the first EHR water inlet valve 34; the fifth barrier 15 is used to block the cooling water output from the hot side water outlet of the ECS heat exchanger 41 from flowing back to the water outlet of the RRI heat exchanger 61 during the performance test, so that the cooling water flows back to the water inlet of the RRI main pump 62 through the PTR heat exchanger 51 and the PTR water outlet valve 53. Specifically, the fifth barrier 15 is closed during the performance test to block the cooling water output from the hot side water outlet of the ECS heat exchanger 41 from flowing back to the water outlet of the RRI heat exchanger 61, so that all the water output from the hot side water outlet of the ECS heat exchanger 41 flows back to the water inlet of the RRI main pump 62 through the PTR heat exchanger 51 and the PTR water outlet valve 53.

[0079] Referring to FIG. 2, in the present embodiment, the principle of the ECS cooling tower 47 obtaining heat from the primary loop during the performance test is as follows: first, one of the RRI main pumps 62 is operated, and the two third valves 64 on the column and the fourth valve 23 are opened, so that the RRI main pump 62 delivers cooling water to the RIS-RHR heat exchanger 21 for heating; then, the first barrier 11 is kept in a closed state, and the heat source obtaining assembly 12 is kept in a conducting state (i.e., the first valve 121 and the second valve 122 are both opened), so that the heated cooling water is only input to the EHR gate valve 31 through the heat source obtaining assembly 12, and at this time, under the blocking action of the third barrier 17, the second barrier 13 and the fourth barrier 14, the cooling water can only be output from the water outlet of the EHR gate valve 31 and input to the hot side water inlet of the ECS heat exchanger 41 through the water outlet pipeline of the EHR gate valve 31; at this time, since the hot side of the ECS heat exchanger 41 obtains the heated cooling water, the hot side and the cold side of the ECS heat exchanger 41 exchange heat, so that the cooling water in the cold side of the ECS heat exchanger 41 is heated, thereby obtaining the heat required for the performance test of the cooling tower; then, since the first EHR water inlet valve 34, the second EHR water inlet valve 35, the first PTR water inlet valve 52 and the second PTR water inlet valve 54 are kept open during the test, and the fifth barrier 15 is kept closed, the cooling water output from the hot side water outlet of the ECS heat exchanger 41 is only delivered to the water inlet of the PTR heat exchanger 51 through the ECS intermediate loop circulating pump 43 and a series of valves; finally, since the PTR water outlet valve 53 is kept open during the test, the cooled cooling water flows back to the water inlet of the RRI main pump 62 through the water outlet pipeline of the PTR water outlet valve 53, thereby completing the entire cooling water circulation. In addition, during the performance test, the ECS intermediate loop circulating pump 43 can be kept running to ensure that the cooling water in the system of the present application has sufficient power to circulate.

[0080] It can be understood that, in the embodiment, most of the paths of the pipelines through which the cooling water flows, except the heat source acquisition assembly 12, belong to the existing pipelines in the heat exchange systems, and therefore, the embodiment can minimize the laying of temporary pipelines; in terms of pressure bearing, the pressure bearing range of the intermediate loop of the ECS is 0-2.9 MPa (g), and the pressure of the cooling water output by the RRI main pump 62 is generally about 1 MPa (g), and therefore, the water taken from the RRI system will not exceed the pressure bearing range of the intermediate loop of the ECS, and meets the safety requirements of nuclear power; in addition, in the large-flow cooling mode, the cooling water flow of the PTR heat exchanger 51 can reach 820 m³ / h, and the actual flow of the ECS intermediate loop circulating pump 43 is generally about 812.4 m³ / h, and therefore, the cooling water output by the hot side outlet of the ECS heat exchanger 41 can be all returned to the water inlet of the RRI main pump 62 through the PTR heat exchanger 51; in terms of flow, since the cooling water flow of the RIS-RHR heat exchanger 21 (generally about 849.6 m³ / h) is close to the actual operating flow of the ECS intermediate loop, the fluid exchange process between the RIS-RHR heat exchanger 21 and the ECS heat exchanger 41 during the thermal performance test will not affect the normal cooling task of the RIS-RHR heat exchanger 21, that is, the stable operation of the primary loop can be ensured during the thermal performance test; in terms of temperature, since the temperature of the ECS intermediate loop is generally about 90°C, and the cooling water temperature output by the RIS-RHR heat exchanger 21 is at most 61.5°C, and therefore, there is no need to worry that taking water from the RIS-RHR heat exchanger 21 will affect the ECS intermediate loop due to high cooling water temperature, that is, the long-term stable operation requirement of the ECS intermediate loop can be met; in terms of the influence on other systems, since the chemical and volume control systems and other systems can also be normally cooled by the two-column RRI system during the test, when one column of RRI is lost, there is no risk of uncontrolled primary loop water physical pressure. It can be understood that, the embodiment can make the performance test as little as possible to affect the normal operation of various heat exchange systems, as long as the heat source acquisition assembly 12 is turned off (that is, the first valve 121 and / or the second valve 122 are closed), the independent operation of the RRI system and the ECS system can be quickly restored, the influence on the main line construction period is small, and the test cost is low.

[0081] In some embodiments, the first barrier 11, the second barrier 13, the fourth barrier 14 and the fifth barrier 15 can all be electric valves.

[0082] As shown in FIG. 4, the application further provides a cooling tower performance test method, which comprises steps S10, S20, S30, S40 and S50.

[0083] Step S10 includes: constructing a heat transfer path for providing a heat source required for the performance test of the ECS cooling tower 47 by the cooling tower performance test device. In this step, the heat transfer path can be constructed by the cooling tower performance test device provided by the embodiment of the application.

[0084] Step S20 includes: setting the operating state of the cooling tower. In this step, the operating state of the cooling tower can include but is not limited to the circulating water amount and the baffle state of the cooling tower. The circulating water amount can be set in the range of 270 t / h to 330 t / h, and the baffle state can be with or without a baffle. The circulating water amount is one of the parameters for controlling the heat load of the cooling tower; in the cooling tower, the baffle is usually arranged above the water-falling filler to prevent the water from falling from the edge gap, thereby preventing the water from not being fully heat-exchanged with the air, so whether the baffle is arranged or not will affect the cooling performance of the cooling tower.

[0085] Step S30 includes: controlling the inlet water temperature of the cooling tower by controlling the operating state of the RIS system and / or the primary loop water temperature. In this step, the operating state of the RIS system and / or the primary loop water temperature can be controlled by the digital control system (DCS system) of the nuclear power plant, so as to control the cooling water temperature of the heat source acquisition assembly 12 input by the RIS-RHR heat exchanger 21, that is, to control the cooling water temperature input to the inlet water port of the hot side of the ECS heat exchanger 41, and the water temperature of the hot side of the ECS heat exchanger 41 is positively correlated with the water temperature of the cold side, so controlling the water temperature of the hot side of the ECS heat exchanger 41 is equivalent to controlling the inlet water temperature of the cooling tower.

[0086] In the nuclear power plant, the maximum heat load that needs to be discharged by a commonly used single cooling tower is generally 7.947 MW, and according to the deviation of not more than 20%, the heat load range that can be taken away by the single cooling tower during the test is 6.357 MW to 9.537 MW. According to the existing design document, the outlet water temperature of the cooling tower needs to be limited to below 34.35℃. If the minimum heat load is 6.357 MW and the outlet water temperature is 34.35℃, the inlet water temperature of the cooling tower needs to be greater than 52.7℃. In order to comply with the cooling tower test procedure and avoid overloading of the cooling tower, the outlet water temperature difference cannot deviate from the design value by more than 20%, so in the case of the outlet water temperature of 34.35℃, the inlet water temperature needs to be not greater than 54.51℃, so the inlet water temperature of the cooling tower can be controlled in the range of 52.7℃ to 54.51℃.

[0087] In addition, in order to avoid overloading of the cooling tower and overly conservative testing, the heat load can be set to 6.67 WM as a calculated value of heat to be removed by the cooling tower during testing, so that the water temperature entering the tower can be controlled at about 53.6°C. Since the heat exchange efficiency of the ECS heat exchanger 41 and the RIS-RHR heat exchanger 21 is known, the water temperature entering the hot side inlet of the RIS-RHR heat exchanger can be calculated based on the heat exchange efficiency after the water temperature entering the tower is determined. For example, when the water temperature entering the tower needs to be 53.6°C, the water temperature entering the hot side inlet of the RIS-RHR heat exchanger corresponds to 70°C. Therefore, the water temperature entering the hot side inlet of the RIS-RHR heat exchanger can be maintained at about 70°C by controlling the operating state of the RIS system (such as adjusting the cooling water flow of the RIS-RHR heat exchanger 21) and / or the primary loop water temperature, so as to complete the thermal performance test.

[0088] The step S40 comprises: obtaining measured working condition data of the cooling tower. The measured working condition data comprises, but is not limited to, ambient wet-bulb temperature, ambient dry-bulb temperature, inlet wet-bulb temperature, inlet dry-bulb temperature, outlet dry-bulb temperature, outlet wet-bulb temperature, atmospheric pressure, measured circulating water flow, inlet water temperature, outlet water temperature, inlet air flow, fan inlet cross-section pressure, fan outlet cross-section pressure, filler bottom cross-section pressure, filler top cross-section pressure, water remover cross-section pressure, cooling tower outlet cross-section pressure, outlet water temperature cross-section pressure, noise, fan shaft power, water spraying density, cooling tower water spraying filler volume, N sets of floating water data, and filter paper area. In addition, N is a natural number.

[0089] The ambient wet-bulb temperature, the ambient dry-bulb temperature, the inlet wet-bulb temperature, the inlet dry-bulb temperature, the outlet dry-bulb temperature, and the outlet wet-bulb temperature can be measured by a DHM2 mechanical ventilation type Asman dry and wet bulb thermometer or a thermal resistance multi-point thermometer at the corresponding positions of the cooling tower, such as the ambient wet-bulb temperature and the ambient dry-bulb temperature at the air inlet of the cooling tower, and the inlet wet-bulb temperature and the inlet dry-bulb temperature above the air inlet of the cooling tower.

[0090] The atmospheric pressure can be measured by a digital pressure gauge in the ambient space outside the cooling tower.

[0091] The measured circulating water flow can be measured by a Controlotron-1010P ultrasonic flowmeter on the upstream and downstream water conveying pipelines of the cooling tower.

[0092] The inlet water temperature and the outlet water temperature can be measured by an existing thermometer.

[0093] The inlet air flow can be measured by arranging an impeller anemometer above the air outlet of the cooling tower or at the fan air inlet, and using the method of equal-area ring.

[0094] The cross-sectional pressure of the fan inlet, the cross-sectional pressure of the fan outlet, the cross-sectional pressure of the filler bottom, the cross-sectional pressure of the filler top, the cross-sectional pressure of the water separator, the cross-sectional pressure of the cooling tower outlet, and the cross-sectional pressure of the water temperature at the outlet of the cooling tower can be obtained by using the micro-pressure gauge in the existing manner. FIG. 3 is a diagram of the positions of different test sections of a cooling tower in a nuclear power plant, in which the number 1 corresponds to the cross-section of the fan inlet, the number 2 corresponds to the cross-section of the fan outlet, the number 3 corresponds to the cross-section of the filler bottom, the number 4 corresponds to the cross-section of the filler top, the number 5 corresponds to the cross-section of the water separator, the number 6 corresponds to the cross-section of the cooling tower outlet, and the number 7 corresponds to the cross-section of the water temperature at the outlet of the cooling tower. It can be understood that the staff can use the micro-pressure gauge to measure the corresponding cross-sectional pressure at the corresponding cross-section.

[0095] The noise can be measured by a noise meter at the fan inlet or the air outlet of the cooling tower.

[0096] The shaft power of the fan can be measured by a power table or a power meter at the power supply of the fan of the cooling tower.

[0097] The water spraying density can be measured by the existing water spraying density measuring device of the cooling tower.

[0098] The water spraying filler volume of the cooling tower is a designable parameter of the cooling tower, and thus can be directly obtained according to the operation parameter data table of the cooling tower. Of course, the water spraying filler volume can be calculated by the existing water spraying filler volume measuring method.

[0099] For N groups of water drift data, the filter paper weighing method can be used for multiple collection, and each group of water drift data includes the weight of the filter paper before each collection of water droplets, the weight of the filter paper after each collection of water droplets, the sampling time of each collection of water droplets, and the water drift amount of each collection of water droplets. For the filter paper area, since the same filter paper is used for each collection of water drift data, the filter paper area can be regarded as a constant.

[0100] The step S50 includes analyzing the measured working condition data and outputting the test result of the cooling tower.

[0101] In some embodiments, the analysis of the measured working condition data can include calculating a calculated water temperature difference according to the environmental dry-bulb temperature, the environmental wet-bulb temperature, the air pressure, the measured circulating water flow, and the inlet water temperature; and calculating a cooling capacity coefficient for evaluating the actual cooling capacity of the cooling tower according to the calculated water temperature difference, the actual inlet water temperature difference between the outlet water temperature and the inlet water temperature.

[0102] Further, the cooling capacity coefficient can be calculated by the following formula:

[0103] ;

[0104] wherein, the cooling capacity coefficient, represents the actual inlet water temperature difference (equal to the outlet water temperature minus the inlet water temperature), represents the calculated water temperature difference. It should be noted that the calculated water temperature difference can be calculated according to the ambient dry-bulb temperature, the ambient wet-bulb temperature, the air pressure and the measured circulating water flow rate by using existing algorithms, which will not be described here.

[0105] In some embodiments, the analyzing the measured operating condition data can further include calculating a heat balance error for evaluating the heat balance performance of the cooling tower according to the inlet air flow rate, the inlet dry-bulb temperature, the inlet wet-bulb temperature, the measured circulating water flow rate, the outlet dry-bulb temperature and the outlet wet-bulb temperature.

[0106] Further, the heat balance error can be calculated by the following formula:

[0107] ;

[0108] wherein, represents the heat balance error, represents the inlet air flow rate, represents the inlet wet air specific enthalpy (calculated according to the inlet dry-bulb temperature and the inlet wet-bulb temperature), represents the outlet wet air specific enthalpy (calculated according to the outlet dry-bulb temperature and the outlet wet-bulb temperature), represents the specific heat capacity of water, represents the measured circulating water flow rate, represents the inlet water temperature, represents the outlet water temperature.

[0109] In some embodiments, the analyzing the measured operating condition data can further include calculating a cooling number for evaluating the cooling performance of the cooling tower according to the inlet water temperature, the outlet water temperature, the inlet air flow rate, the inlet dry-bulb temperature, the inlet wet-bulb temperature, the outlet dry-bulb temperature and the outlet wet-bulb temperature.

[0110] Further, the cooling number can be calculated by the following formula:

[0111] ;

[0112] wherein, represents the cooling number, represents the average of the inlet wet air specific enthalpy and the outlet wet air specific enthalpy, represents the saturated air enthalpy corresponding to the inlet water temperature (which can be calculated according to the inlet wet air specific enthalpy and the inlet water temperature), represents the saturated air enthalpy corresponding to the outlet water temperature (which can be calculated according to the outlet wet air specific enthalpy and the outlet water temperature).

[0113] In some embodiments, the analyzing the measured working condition data can further include: calculating the volumetric mass transfer coefficient of the cooling tower according to the measured circulating water flow, the cooling tower sprinkling water filler volume and the cooling number.

[0114] Further, the volumetric mass transfer coefficient can be calculated by the following formula:

[0115] ;

[0116] wherein, represents the volumetric mass transfer coefficient, represents the cooling number.

[0117] In some embodiments, the analyzing the measured working condition data can further include: calculating the drift loss rate of the cooling tower according to the sprinkling water density, the filter paper area and N groups of drift loss data.

[0118] Further, the volumetric mass transfer coefficient can be calculated by the following formula:

[0119] ;

[0120] wherein, represents the drift loss amount at i point, represents the filter paper weight before collecting water drops at i point, represents the filter paper weight after collecting water drops at i point, represents the sampling time for collecting the drift loss amount at i point, represents the average drift loss amount, and N represents the total number of measuring points (i.e. the total number of groups of drift loss data), represents the drift loss rate, represents the filter paper area, represents the sprinkling water density.

[0121] In some embodiments, the analyzing the measured working condition data can further include: calculating the pressure of each component of the cooling tower in sequence according to the fan inlet cross-section pressure, the fan outlet cross-section pressure, the filler bottom cross-section pressure, the filler upper cross-section pressure, the water separator cross-section pressure, the cooling tower outlet cross-section pressure and the outlet water temperature cross-section pressure.

[0122] Further, the resistance between each component can be calculated by the following formula:

[0123] ;

[0124] wherein, represents the resistance of a certain component, represents the pressure of the i cross-section, represents the pressure of the i+1 cross-section.

[0125] In some embodiments, the analyzing the measured working condition data can further include: determining whether the noise is greater than a set noise value, and if yes, determining that the noise of the cooling tower is too large.

[0126] In some embodiments, the analyzing the measured working condition data can further include: determining whether the wind shaft power is within a preset range, and if yes, determining that the fan of the cooling tower is operating normally.

[0127] In order to comprehensively test the thermal performance of the cooling tower, in some embodiments, the step S50 can be followed by a step S60 and a step S70.

[0128] The step S60 includes: determining whether all the test items in the predetermined test items have been tested, and if yes, executing the step S70, otherwise, resetting the operating state of the cooling tower based on the uncompleted test items in the predetermined test items, and returning to the step S30. Specifically, the predetermined test items can include several test items, wherein each test item can be designed by the staff in advance, and the design content includes but is not limited to the circulating water amount and the baffle state of the cooling tower. In this embodiment, when all the test items are completed, a plurality of sets of test results of the cooling tower are obtained, so that the staff can analyze and evaluate the heat exchange performance of the cooling tower under different operating states.

[0129] In some embodiments, the predetermined test items can be formulated by the parameters shown in Table 1.

[0130]

[0131] Table 1

[0132] In this embodiment, the circulating water amount is set at the minimum value, the maximum value and the intermediate value of the settable range of the circulating water amount, and the baffle is set or not set, so that the thermal performance test is performed on the cooling tower under a total of six different test items, thereby comprehensively testing and evaluating the performance of the cooling tower, and improving the accuracy and reliability of the test.

[0133] The step S70 comprises: judging whether each type of calculation value in the measured working condition data of each test item is in the corresponding preset range respectively, if a calculation value is in the corresponding preset range, it is determined that the calculation value meets the requirement, and the margin of the calculation value is calculated based on the calculation value and the corresponding preset range, if a calculation value is not in the corresponding preset range, it is determined that the calculation value does not meet the requirement. Specifically, each type of calculation value in the measured working condition data can include cooling capacity coefficient, heat balance error, cooling number, volume mass coefficient, water drift rate and resistance of each component, wherein, the related preset range can be determined according to the type of the calculation value, for example, the cooling capacity coefficient, whether the calculated cooling capacity coefficient is in the preset range of the cooling capacity coefficient is judged, if yes, it is determined that the cooling capacity coefficient meets the requirement, then, the difference between the calculated cooling capacity coefficient and the upper limit and lower limit of the preset range of the cooling capacity coefficient is calculated, thereby obtaining the margin (the margin is represented by the size of the difference). It should be noted that the preset range corresponding to each calculation value can be set according to actual needs, which is not limited here.

[0134] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0135] It can be understood that the above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A cooling tower performance test device, characterized in that: include: a first blocking member (11) provided on the outlet pipe of the RIS-RHR heat exchanger (21) for blocking the cooling water heated by the RIS-RHR heat exchanger (21) from being transported to the downstream pipe of the outlet pipe of the RIS-RHR heat exchanger (21) during the performance test; a heat source acquisition component (12), a first end of which is mechanically connected between the first barrier (11) and the water outlet of the RIS-RHR heat exchanger (21), and a second end of which is mechanically connected to the EHR gate valve (31), for acquiring cooling water outputted from the RIS-RHR heat exchanger (21) during a performance test, so that the cooling water is transported to the hot side water inlet of the ECS heat exchanger (41) through the water outlet pipeline of the EHR gate valve (31); as well as The second blocking member (13) is provided on a pipeline connected between the water outlet of the PTR heat exchanger (51) and the hot side water inlet of the ECS heat exchanger (41), and is used to block the cooling water from flowing back to the water outlet of the PTR heat exchanger (51) during the performance test.

2. The cooling tower performance test device according to claim 1, characterized in that: The heat source acquisition component (12) comprises: A first valve (121) has a first end mechanically connected between the first barrier (11) and the water outlet of the RIS-RHR heat exchanger (21), and a second end mechanically connected to the valve core outlet of the EHR gate valve (31).

3. The cooling tower performance test device according to claim 2, characterized in that: The first end of the first valve (121) is mechanically connected to the valve core outlet of the RIS check valve (22) arranged between the first blocking member (11) and the water outlet of the RIS-RHR heat exchanger (21).

4. The cooling tower performance test device according to claim 3, characterized in that: The heat source acquisition component (12) further includes a second valve (122); the second end of the first valve (121) is mechanically connected to the valve core outlet of the EHR gate valve (31) via the second valve (122); The cooling tower performance test device also includes: a third blocking member (17) detachably mounted in the EHR flow restriction orifice (32) for blocking the cooling water of the ECS circuit from flowing back to the hot side water inlet of the ECS heat exchanger (41) through the EHR heat exchanger (33) during the performance test; and A fourth blocking member (14) is provided on the outlet pipe of the EHR flow limiting orifice (32) and is used to block the cooling water from flowing back to the inlet of the RRI main pump (62) through the water inlet of the EHR gate valve (31) during the performance test.

5. The cooling tower performance test device according to claim 4, characterized in that: The first valve (121) and the second valve (122) are mechanically connected via a DN300 pipe.

6. The cooling tower performance test device according to claim 4, characterized in that: The third barrier (17) is a blind plate; and / or the first barrier (11), the second barrier (13) and the fourth barrier (14) are electric valves.

7. The cooling tower performance test device according to claim 4, characterized in that: The first valve (121) and the second valve (122) are flange valves respectively.

8. The cooling tower performance test device according to any one of claims 1 to 7, characterized in that: Also includes: The fifth barrier (15) is provided between the sixth valve (82) and the first EHR water inlet valve (34) and is used to block the cooling water outputted from the hot side water outlet of the ECS heat exchanger (41) from flowing back to the water outlet of the RRI heat exchanger (61) during the performance test, thereby allowing the cooling water to flow back to the water inlet of the RRI main pump (62) through the PTR heat exchanger (51) and the PTR water outlet valve (53).

9. A cooling tower performance test method, characterized in that: The following steps are involved: S10. Constructing a heat transfer path for providing a heat source required for a performance test for an ECS cooling tower (47) by using the cooling tower performance test device according to any one of claims 1 to 8; S20, setting the operating state of the cooling tower; S30, controlling the inlet water temperature of the cooling tower by controlling the operating state of the RIS system and / or the primary circuit water temperature; S40, obtaining measured operating condition data of the cooling tower; S50: Analyze the measured operating condition data and output cooling tower test results.

10. The cooling tower performance test method according to claim 9, characterized in that: The controlling of the inlet water temperature of the cooling tower includes controlling the inlet water temperature to be between 52.7° C. and 54.51° C.

11. The cooling tower performance test method according to claim 9, characterized in that: The setting of the operating state of the cooling tower includes: The circulating water volume and the water baffle status of the cooling tower are set; wherein, the setting range of the circulating water volume is 270t / h~330t / h, and the water baffle status is whether a water baffle is set or not.

12. The cooling tower performance test method according to claim 9, characterized in that: The measured operating condition data include ambient dry-bulb temperature, ambient wet-bulb temperature, atmospheric pressure, measured circulating water flow, tower inlet water temperature, tower outlet water temperature, tower inlet air flow, tower inlet dry-bulb temperature, tower inlet wet-bulb temperature, tower outlet dry-bulb temperature and tower outlet wet-bulb temperature; The analyzing of the measured working condition data includes: calculating a calculated water temperature difference based on the ambient dry-bulb temperature, the ambient wet-bulb temperature, the atmospheric pressure, the measured circulating water flow rate, and the tower water inlet temperature, and further calculating a cooling capacity coefficient for evaluating the actual cooling capacity of the cooling tower based on the calculated water temperature difference, the tower water inlet temperature, and the tower water outlet temperature; Calculating a thermal balance error for evaluating the thermal balance performance of the cooling tower based on the tower inlet air flow rate, the tower inlet dry-bulb temperature, the tower inlet wet-bulb temperature, the measured circulating water flow rate, the tower outlet dry-bulb temperature, and the tower outlet wet-bulb temperature; A cooling number for evaluating the cooling performance of the cooling tower is calculated based on the inlet water temperature, the outlet water temperature, the inlet air flow, the inlet dry bulb temperature, the inlet wet bulb temperature, the outlet dry bulb temperature, and the outlet wet bulb temperature.

13. The cooling tower performance test method according to claim 12, characterized in that: The measured operating condition data also includes the volume of the cooling tower water spray packing, the fan inlet cross-sectional pressure, the fan outlet cross-sectional pressure, the packing bottom cross-sectional pressure, the packing upper cross-sectional pressure, the dehumidifier cross-sectional pressure, the cooling tower outlet cross-sectional pressure, the tower water temperature cross-sectional pressure, the water spray density, N groups of drift water data obtained by multiple collections based on the filter paper weighing method, and the filter paper area; wherein each group of the drift water data includes the weight of the filter paper before each water droplet collection, the weight of the filter paper after each water droplet collection, the sampling time of each water droplet collection, and the drift water volume of each water droplet collection; The analyzing of the measured working condition data further includes: Calculating the volumetric mass coefficient of the cooling tower according to the measured circulating water flow rate, the volume of the cooling tower water filling material and the cooling number; Calculating the resistance of each component of the cooling tower in sequence according to the fan inlet cross-sectional pressure, the fan outlet cross-sectional pressure, the filler bottom cross-sectional pressure, the filler upper cross-sectional pressure, the water eliminator cross-sectional pressure, the cooling tower outlet cross-sectional pressure and the tower outlet water temperature cross-sectional pressure; The water drift rate of the cooling tower is calculated according to the water spray density, the filter paper area and N groups of the water drift data.

14. The cooling tower performance test method according to claim 12 or 13, characterized in that: Also includes: S60, determining whether all test items in the predetermined test items have been tested, if so, executing S70, otherwise resetting the operating state of the cooling tower based on the unfinished test items in the predetermined test items, and returning to S30; S70. The measured working condition data of each test item are subjected to the following steps: respectively determine whether various calculated values ​​in the measured working condition data are within the corresponding preset range; if a calculated value is within the corresponding preset range, determine that the calculated value meets the requirements; and calculate the margin of the calculated value based on the calculated value and the corresponding preset range; if a calculated value is not within the corresponding preset range, determine that the calculated value does not meet the requirements.

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