A dynamic simulation test device for seawater circulating cooling water

Abstract

The invention discloses a seawater circulating cooling water dynamic simulation test device, wherein the outlet of the heat exchange tube in the simulated condenser is connected to the inlet of the water distributor in the simulated cooling tower via a corrosion monitoring tube and a bypass online monitoring device in sequence, an axial flow fan and filler are arranged in the simulated cooling tower, a water collecting tank is located below the simulated cooling tower, the outlet at the bottom of the water collecting tank is connected to the inlet of the heat exchange tube in the simulated condenser, a sewage regulating system is connected to a pipeline between a pump outlet valve and a flow meter; a cooling pipe is arranged in the water collecting tank, a cooling medium input pipeline is connected to the inlet of the cooling pipe, and a cooling medium output pipeline is connected to the outlet of the cooling pipe; an electric heater is arranged at the bottom of the simulated condenser, a second temperature measuring instrument is arranged on the inner side of the top of the simulated condenser, wherein a temperature controller is connected to the second temperature measuring instrument and the electric heater, and the device can simulate the operation of the seawater circulating cooling water system more accurately.

Description

Technical Field

[0001] The invention belongs to the technical field of power generation and relates to a seawater circulating cooling water dynamic simulation test device. Background Art

[0002] Most coastal power plants use seawater as a cooling water source. Most domestic power plants that use seawater as cooling water use a direct-flow process. In order to alleviate the contradiction between the increasing shortage of freshwater resources and the growing demand for industrial water, as well as to reduce the thermal pollution caused by cooling water discharge, the direct-flow cooling process of seawater has gradually developed into a circulating cooling process of seawater. The composition of seawater is complex, with high levels of corrosive ions such as chloride ions and scaling ions such as calcium ions. In addition, there are many types of organisms in seawater, which are prone to biofouling and cause biological fouling. Therefore, the operation and control of the circulating cooling water process using seawater is more complicated than that using fresh water.

[0003] Before the seawater circulation cooling process is officially put into operation, the control parameters such as the scale and corrosion inhibitor dosage, acid dosage, bactericide dosage and dosage cycle are generally determined preliminarily through small-scale dynamic simulation tests. During the dynamic simulation test, indicators such as conductivity, alkalinity, and algae count are regularly analyzed and tested manually, and the dosage and sewage discharge are adjusted in real time according to the test results. This dynamic simulation test bench has the following problems:

[0004] 1) Manual analysis results are lagging and cannot reflect the measurement results in time. If the concentration ratio exceeds the standard, it may not be discovered in time and the sewage discharge or dosage may not be adjusted;

[0005] 2) The quality of personnel will affect the test results;

[0006] 3) The temperature of the simulation test bench cannot be accurately controlled, resulting in the inability to accurately monitor the fouling thermal resistance.

[0007] It is imperative to construct an improved dynamic simulation test device to accurately simulate the operation of seawater circulating cooling water systems. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a seawater circulating cooling water dynamic simulation test device, which can more accurately simulate the operation of a seawater circulating cooling water system.

[0009] To achieve the above-mentioned purpose, the seawater circulating cooling water dynamic simulation test device of the present invention comprises a simulated condenser, a corrosion monitoring pipe, a bypass online monitoring device, a simulated cooling tower, a water collecting tank, a water pump, a pump outlet valve, a flow meter, a sewage regulation system, a cooling medium input pipeline, a cooling medium output pipeline and a temperature controller;

[0010] The outlet of the heat exchange tube in the simulated condenser is connected to the inlet of the water distributor in the simulated cooling tower through the corrosion monitoring tube and the bypass online monitoring device in turn. An axial flow fan and filler are arranged in the simulated cooling tower, wherein the axial flow fan is located above the water distributor, the filler is located below the water distributor, the water collecting tank is located below the simulated cooling tower, and the outlet at the bottom of the water collecting tank is connected to the inlet of the heat exchange tube in the simulated condenser through a water pump, a pump outlet valve, and a flow meter, and the sewage regulation system is connected to the pipeline between the pump outlet valve and the flow meter;

[0011] A cooling pipe is arranged in the water collecting tank, a cooling medium input pipe is connected to the inlet of the cooling pipe, and a cooling medium output pipe is connected to the outlet of the cooling pipe;

[0012] A first temperature measuring instrument is provided at the inlet and outlet of the heat exchange tube, an electric heater is provided at the bottom of the simulated condenser, and a second temperature measuring instrument is provided on the inner side of the top of the simulated condenser, wherein the temperature controller is connected to the second temperature measuring instrument and the electric heater.

[0013] A drain valve is provided at the drain port at the bottom of the simulated condenser.

[0014] The bypass online monitoring device includes a conductivity probe, a pH probe and a biomass monitoring probe.

[0015] The sewage regulation system comprises a flow meter, a needle valve and a water collecting head which are connected in sequence.

[0016] It also includes a bypass pipeline, one end of which is connected to the pipeline between the pump outlet valve and the flow meter, and the other end of which is connected to the inlet of the water collecting tank. A bypass valve is arranged on the bypass pipeline.

[0017] The sewage regulating system is connected to the bypass pipeline.

[0018] A liquid level switch is arranged in the water collecting tank, the outlet of the supplementary water tank is connected with the inlet of the water collecting tank via a solenoid valve, and the liquid level switch is connected with the solenoid valve.

[0019] The present invention has the following beneficial effects:

[0020] During specific operation, the seawater circulating cooling water dynamic simulation test device described in the present invention starts the electric heater to heat the test water in the heat exchange tube, heats the test water to a preset temperature, and then sends it to the water distributor, and then sprays it onto the filler through the water distributor, and finally enters the water collecting tank. The water in the water collecting tank then enters the heat exchange tube, and the cycle repeats. When the concentration ratio reaches the requirement, sewage discharge is started through the sewage discharge regulation system to achieve dynamic simulation of seawater circulating cooling water. In addition, during the test, the temperatures at the inlet and outlet of the heat exchange tube are detected by two first thermometers, the temperature inside the simulated condenser is detected by the second thermometer, the water quality conductivity, pH and biological sludge amount are monitored in real time by the bypass online monitoring device, and the corrosion condition is detected by the corrosion monitoring tube to avoid various problems caused by human operation, thereby improving the accuracy of the simulation experiment and eliminating manual testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 Schematic diagram of the heat exchange tube.

[0023] Among them, 1 is a temperature controller, 2 is a second thermometer, 3 is a drain valve, 4 is an electric heater, 5 is a first thermometer, 6 is a heat exchange tube, 7 is a simulated condenser, 8 is a corrosion monitoring tube, 9 is a bypass online monitoring device, 10 is an axial flow fan, 11 is a water distributor, 12 is a cooling tower, 13 is a filler, 14 is a supplementary water tank, 15 is a solenoid valve, 16 is a water collecting tank, 17 is a liquid level switch, 18 is a cooling pipe, 19 is a sewage regulation system, 20 is a bypass valve, 21 is a water pump, 22 is a pump outlet valve, and 23 is a flow meter. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0025] refer to Figure 1The seawater circulating cooling water dynamic simulation test device of the present invention comprises a simulated condenser 7, a corrosion monitoring pipe 8, a bypass online monitoring device 9, a simulated cooling tower 12, a water collecting tank 16, a water pump 21, a pump outlet valve 22, a flow meter 23, a sewage regulation system 19, a cooling medium input pipeline, a cooling medium output pipeline and a temperature controller 1; the outlet of the heat exchange tube 6 in the simulated condenser 7 is connected to the inlet of the water distributor 11 in the simulated cooling tower 12 through the corrosion monitoring pipe 8 and the bypass online monitoring device 9 in turn, and an axial flow fan 10 and a filler 13 are arranged in the simulated cooling tower 12, wherein the axial flow fan 10 is located above the water distributor 11, the filler 13 is located below the water distributor 11, and the water collecting tank 16 is located Below the simulated cooling tower 12, the outlet at the bottom of the water collecting tank 16 is connected to the inlet of the heat exchange tube 6 in the simulated condenser 7 through the water pump 21, the pump outlet valve 22, and the flow meter 23, and the sewage regulation system 19 is connected to the pipeline between the pump outlet valve 22 and the flow meter 23; a cooling tube 18 is arranged in the water collecting tank 16, the cooling medium input pipeline is connected to the inlet of the cooling tube 18, and the cooling medium output pipeline is connected to the outlet of the cooling tube 18; a first thermometer 5 is arranged at the inlet and outlet of the heat exchange tube 6, an electric heater 4 is arranged at the bottom of the simulated condenser 7, and a second thermometer 2 is arranged on the inner side of the top of the simulated condenser 7, wherein the temperature controller 1 is connected to the second thermometer 2 and the electric heater 4.

[0026] A drain valve 3 is provided at the drain port at the bottom of the simulated condenser 7; the bypass online monitoring device 9 includes a conductivity probe, a pH probe and a biomass monitoring probe; and the sewage regulation system 19 includes a flow meter, a needle valve and a water collection head connected in sequence.

[0027] The present invention also includes a bypass pipe, one end of which is connected to the pipeline between the pump outlet valve 22 and the flow meter 23, and the other end of the bypass pipe is connected to the inlet of the water collecting tank 16. A bypass valve 20 is provided on the bypass pipe, wherein the sewage regulation system 19 is connected to the bypass pipe; a liquid level switch 17 is provided in the water collecting tank 16, and the outlet of the supplementary water tank 14 is connected to the inlet of the water collecting tank 16 via the solenoid valve 15, and the liquid level switch 17 is connected to the solenoid valve 15.

[0028] Specifically, the simulated condenser 7 is an electric heating water tank made of 316L material, with a φ25mm interface inside, which can be connected to the heat exchange tube 6. The maximum number of connections is 9, and the length of a single tube is 1000mm. The flow chart of cooling water in the heat exchange tube 6 is as follows: Figure 2As shown, 8 electric heaters 4 are installed inside the simulated condenser 7, with powers of 6 1.5kw and 2 1.0kw. Under the control of the temperature controller 1, the test water inside the heat exchange tube 6 can be continuously heated to ensure the temperature stability of the high-temperature side of the heat exchange tube 6 outlet, and at the same time, the condenser tube outlet temperature reaches 38°C-43°C. The temperature at the inlet and outlet of the heat exchange tube 6 is detected by two first temperature measuring instruments 5, and the temperature inside the simulated condenser 7 is detected by the second temperature measuring instrument 2.

[0029] The simulated cooling tower 12 is a small hyperbolic cooling tower, which mainly plays the role of enhancing evaporation and heat dissipation. Its height is about 1.8m, the maximum diameter is about 1.0m, and the minimum diameter is about 0.8m. When running, its internal filling is about 0.3m 3 The filler 13 is used to enhance heat exchange, and a mother branch pipe type water distributor 11 is provided on the upper part of the filler 13.

[0030] The water collecting tank 16 is made of polytetrafluoroethylene and has a volume of 1.0m 3 , maintain water volume of 400L during operation.

[0031] The water pump 21 is a seawater corrosion-resistant polytetrafluoroethylene-lined circulation pump with a rated flow rate of 8m 3 / h, the maximum head is 32m.

[0032] The flow meter 23 is a plexiglass rotor flow meter, and the rotor is made of non-metallic material.

[0033] The corrosion monitoring tube 8 is a plexiglass tube with diameters of φ20, φ30 and φ40, and is used for dynamic hanging test of materials at different flow rates.

[0034] The material of the supplementary water tank 14 is polytetrafluoroethylene, and a solenoid valve 15 is installed at the outlet of the supplementary water tank 14. The solenoid valve 15 cooperates with the liquid level switch 17 in the water collecting tank 16 to realize real-time water replenishment and ensure the stability of the water level inside the water collecting tank 16.

[0035] The sewage discharge regulating system 19 includes a flow meter, a needle valve and a water collecting head which are connected in sequence. The sewage discharge volume can be accurately adjusted by controlling the opening of the needle valve, thereby ensuring the stability of the circulating water concentration ratio.

[0036] The cooling tube 18 in the water collecting tank 16 is a titanium tube, and the interior of the cooling tube 18 is low-temperature cooling water, which is used to reduce the temperature of the circulating cooling water in the water collecting tank 16 .

[0037] The bypass online monitoring device 9 is used to monitor the water quality conductivity, pH and biological sludge amount in real time during the operation of the circulating water.

[0038] During the test, test water is added to the dynamic test system until the water volume meets the requirements, and the water pump 21 is started to adjust the circulating water flow at the required flow rate; the electric heater 4 is started, and the temperature controller 1 is used to control the water temperature at the outlet of the heat exchange tube 6, and automatic continuous water replenishment is used to keep the system water volume unchanged; the test water enters the simulated condenser 7 for heat exchange, and then sprays onto the filler 13 in the simulated cooling tower 12 through the water distributor 11 for heat dissipation and cooling, and then flows into the water collection tank 16 below. This cycle is repeated. When the concentration ratio reaches the requirement, the sewage is discharged through the sewage regulation system 19, and the sewage flow is adjusted to keep the concentration ratio stable within the required range. The test enters the stable operating stage and runs for more than 15 days.

Claims

1. A seawater circulating cooling water dynamic simulation test device, characterized in that: It includes a simulated condenser (7), a corrosion monitoring pipe (8), a bypass online monitoring device (9), a simulated cooling tower (12), a water collecting tank (16), a water pump (21), a pump outlet valve (22), a flow meter (23), a sewage regulation system (19), a cooling medium input pipeline, a cooling medium output pipeline and a temperature controller (1); The outlet of the heat exchange tube (6) in the simulated condenser (7) is connected to the inlet of the water distributor (11) in the simulated cooling tower (12) via the corrosion monitoring tube (8) and the bypass online monitoring device (9) in sequence. An axial flow fan (10) and a filler (13) are arranged in the simulated cooling tower (12), wherein the axial flow fan (10) is located above the water distributor (11), the filler (13) is located below the water distributor (11), the water collecting tank (16) is located below the simulated cooling tower (12), the outlet at the bottom of the water collecting tank (16) is connected to the inlet of the heat exchange tube (6) in the simulated condenser (7) via a water pump (21), a pump outlet valve (22), and a flow meter (23), and the sewage regulation system (19) is connected to the pipeline between the pump outlet valve (22) and the flow meter (23); A cooling pipe (18) is arranged in the water collecting box (16), a cooling medium input pipe is connected to the inlet of the cooling pipe (18), and a cooling medium output pipe is connected to the outlet of the cooling pipe (18); A first temperature measuring instrument (5) is provided at the inlet and outlet of the heat exchange tube (6), an electric heater (4) is provided at the bottom of the simulated condenser (7), and a second temperature measuring instrument (2) is provided on the inner side of the top of the simulated condenser (7), wherein a temperature controller (1) is connected to the second temperature measuring instrument (2) and the electric heater (4); A drain valve (3) is provided at the drain port at the bottom of the simulated condenser (7); The bypass online monitoring device (9) comprises a conductivity probe, a pH probe and a biomass monitoring probe.

2. The seawater circulating cooling water dynamic simulation test device according to claim 1 is characterized in that: The sewage discharge regulating system (19) comprises a flow meter, a needle valve and a water collecting head which are connected in sequence.

3. The seawater circulating cooling water dynamic simulation test device according to claim 1 is characterized in that: It also includes a bypass pipeline, one end of which is connected to the pipeline between the pump outlet valve (22) and the flow meter (23), and the other end of which is connected to the inlet of the water collecting tank (16). A bypass valve (20) is provided on the bypass pipeline.

4. The seawater circulating cooling water dynamic simulation test device according to claim 3 is characterized in that: The sewage regulating system (19) is connected to the bypass pipeline.

5. The seawater circulating cooling water dynamic simulation test device according to claim 1 is characterized in that: A liquid level switch (17) is arranged in the water collecting tank (16); the outlet of the supplementary water tank (14) is connected to the inlet of the water collecting tank (16) via the electromagnetic valve (15); and the liquid level switch (17) is connected to the electromagnetic valve (15).

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