Circulating water scale inhibition dynamic simulation device with intelligent monitoring function

Abstract

The utility model discloses a circulating water scale inhibition dynamic simulation device with an intelligent monitoring function, which comprises a circulating water system and a steam generator, and is characterized in that the bottom of the steam generator is filled with water and is provided with a heater; the circulating water system comprises a water inlet device, a cooling system, a piece hanging device and a heat exchange pipe, the heat exchange pipe is installed in the upper end of the steam generator, an inlet of the heat exchange pipe is connected with the water inlet device through a water inlet pipeline, a water inlet branch is arranged on the water inlet pipeline, and the piece hanging device and a corrosion rate sensor are arranged on a pipeline of the water inlet branch. An outlet of the heat exchange pipe is connected with a cooling system through a water outlet pipeline, a water outlet branch is arranged on the water outlet pipeline, a piece hanging device is arranged on the water outlet branch, and the cooling system is connected with a water inlet device through a pipeline. In the structure of the application, test water enters the heat exchange tube, heat exchange is carried out on the heat exchange tube through hot steam generated by the steam generator, the on-site scale inhibition working condition is simulated, the experiment process is simple, and the problem that the performance of the scale inhibitor cannot be rapidly and sensitively evaluated in the prior art is well solved.

Description

Technical Field

[0001] The utility model relates to a circulating water scale inhibition dynamic simulation device with an intelligent monitoring function. Background Art

[0002] Circulating cooling water scale inhibitor is a chemical that prevents insoluble salts from scaling the surface of heat exchange equipment in circulating cooling water systems. It is widely used in circulating cooling water systems because of its convenience and good economy. However, due to the wide variety of reverse circulating cooling water scale inhibitors and their varying quality and performance, it is very important to evaluate the performance of circulating cooling water scale inhibitors.

[0003] The conductivity method is a method worthy of promotion for evaluating the scale inhibition performance of water treatment agents. However, manual titration is subject to many human factors, has poor repeatability, is still time-consuming and labor-intensive, and the accuracy and reliability of the results are not ideal.

[0004] In addition, in the existing technology, some test devices take a long time to evaluate the scale inhibitor, and the calculation process is relatively complicated. Some test devices can only evaluate the performance of the scale inhibitor under static conditions. Some test devices can only compare the performance of the scale inhibitor after a large amount of scaling. Some test devices can only meet the evaluation requirements of the industry, all of which have certain limitations. Summary of the invention

[0005] In view of the above-mentioned technical problems existing in the prior art, the purpose of this application is to provide a circulating water scale inhibition dynamic simulation device with intelligent monitoring function. The utility model can not only realize the performance evaluation of scale inhibitors, but also the performance evaluation of physical scale inhibitors.

[0006] The technical solutions adopted in this application are as follows:

[0007] A circulating water scale prevention dynamic simulation device with intelligent monitoring function, comprising a circulating water system and a steam generator.

[0008] The bottom of the steam generator contains water and is provided with a heater;

[0009] The circulating water system includes a water inlet device, a cooling system, a plate hanger and a heat exchange tube. The heat exchange tube is detachably installed in the upper end of the steam generator. The inlet of the heat exchange tube is connected to the water inlet device through a water inlet pipeline. A water inlet branch is arranged on the water inlet pipeline. A plate hanger and a corrosion rate sensor are arranged on the pipeline of the water inlet branch. The outlet of the heat exchange tube is connected to the cooling system through a water outlet pipeline. A water outlet branch is arranged on the water outlet pipeline. A plate hanger is arranged on the water outlet branch. The cooling system is connected to the water inlet device by a pipeline. The test water output by the water inlet device enters the heat exchange tube through the water inlet pipeline. The heat exchange tube is heat exchanged with the hot steam generated by the steam generator to simulate the on-site scale inhibition condition. The outlet water of the heat exchange tube is cooled by the cooling system and then returned to the water inlet device to maintain water circulation. Control valves are arranged on the corresponding pipelines.

[0010] Furthermore, the water inlet device includes a water make-up tank device, a water storage tank, a circulation pump and a dosing tank device. The water make-up tank device contains water samples to be tested, and the dosing tank device contains scale inhibitor solution. The water make-up tank device and the dosing tank device are respectively used to replenish the water sample and scale inhibitor solution to the water storage tank. The test water in the water storage tank is pumped out by the circulation pump and enters the heat exchange tube through the water inlet pipe. The water outlet from the heat exchange tube is cooled by the cooling system and then returned to the water storage tank.

[0011] Furthermore, the water outlet pipeline of the heat exchange tube outlet is divided into two routes, one route is connected to the cooling system through a pipeline, and the other route is connected to a sewage solenoid valve, so as to facilitate the sewage discharge of the outlet water to the ditch through the sewage solenoid valve;

[0012] The water inlet branch pipeline is also provided with a conductivity sensor and a pH sensor. The conductivity sensor is connected with the water replenishment tank device, the drug dosing tank device and the sewage solenoid valve signal through the PLC control system. The conductivity sensor transmits the monitored conductivity data to the PLC control system. When the monitored conductivity data exceeds the set value, the PLC control system feeds back and controls the sewage solenoid valve to open for sewage discharge, and controls the water replenishment tank device to replenish water samples to maintain the balance of the liquid level in the water storage tank, and controls the drug dosing tank device to accurately control the amount of the scale inhibitor solution added to replenish the amount of the scale inhibitor solution lost due to sewage discharge by the sewage solenoid valve, until the monitored conductivity data reaches the normal range.

[0013] Furthermore, the cooling system includes a cooling tower, and a spray head and a packing layer are arranged in sequence from top to bottom inside the cooling tower. An air inlet is provided on the side of the lower end of the cooling tower and the air inlet is connected to the fan through a pipeline. An air outlet is provided on the top of the cooling tower, and the water outlet pipeline penetrates into the cooling tower and is connected to the spray head. A liquid outlet is provided at the bottom of the cooling tower and the liquid outlet is connected to a water tank through a pipeline.

[0014] Furthermore, a liquid level meter is provided in the water tank, and the liquid level meter is connected to the water replenishing tank device through a PLC control system. The liquid level meter transmits the monitored liquid level data to the PLC control system. When the monitored liquid level drops, the PLC control system is used to feedback and control the water replenishing tank device to replenish water samples to maintain the liquid level in the water tank balanced.

[0015] Furthermore, a glass rotor flowmeter is provided on the water outlet pipeline of the circulation pump, the water outlet pipeline of the circulation pump is connected to the water inlet pipeline of the heat exchange tube, and a flow sensor is provided on the water inlet pipeline.

[0016] Furthermore, two buffer cavities are symmetrically arranged on opposite sides of the upper end of the steam generator, and a thermometer for measuring the water temperature is arranged on the buffer cavities. The heat exchange tube of the circulating water system is detachably installed between the two buffer cavities, and the heat exchange tube is horizontally placed in the upper end of the steam generator.

[0017] Furthermore, the number of the circulating water systems is two or more, and the heat exchange tubes of each circulating water system are detachably installed in the upper end of the steam generator.

[0018] Furthermore, the present application also includes a condenser, a steam outlet is provided at the top of the steam generator, the steam outlet is connected to the condensation inlet of the condenser through a pipeline, the condensation outlet of the condenser is provided with a condensate thermometer for monitoring the temperature of the condensate, the condensation outlet of the condenser discharges the condensate into the high-temperature tank, and the liquid outlet at the bottom of the high-temperature tank is connected to the steam generator by a pipeline to facilitate the reflux of the condensate into the steam generator;

[0019] The condensate thermometer is connected to the heater and alarm system signals through the PLC control system. The condensate thermometer transmits the monitored temperature data to the PLC control system. When the condensate temperature is low, the PLC control system feedbacks and controls the heater to increase the heating power until the condensate temperature reaches the set value range. When the condensate temperature is too high, the PLC control system feedbacks and controls the heater to shut down and controls the alarm system to automatically alarm.

[0020] The film hanging device comprises a transparent glass tube and a hanging film arranged in the glass tube.

[0021] Compared with the prior art, the beneficial effects of this application are:

[0022] 1. Using a double waterway process or a multi-waterway process, the device is equipped with two or more circulating water systems, which can not only conduct parallel comparative tests on water samples containing antiscalant solutions of the same formula, but also conduct performance screening tests on water samples containing antiscalant solutions of different formulas.

[0023] 2. Realize the automatic sewage discharge function, and determine the concentration multiple by the ratio of the conductivity of the circulating water to the conductivity of the supplementary water to control the opening and closing of the sewage discharge solenoid valve

[0024] 3. The device is equipped with inlet and outlet hanging devices, through which the corrosion and scaling of the test piece by water can be visually observed.

[0025] 4. The system realizes automatic alarm and interlocking functions, and automatically alarms and interlocks when the flow rate is too low or too high, or the temperature is too low or too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a circulating water scale inhibition dynamic simulation device with intelligent monitoring function for this application;

[0027] Figure 2 This is a schematic diagram of the structure of the steam generator of this application;

[0028] Figure 3 A structural schematic diagram of a partial structure of a steam generator of the present application;

[0029] In the figure: 1-water storage tank, 2-dosing tank device, 3-water replenishing tank device, 4-cooling tower, 4a-sprinkler head, 4b-packing layer, 5-corrosion rate sensor, 6-conductivity sensor, 7-pH sensor, 8-glass rotor flowmeter, 9-flow sensor, 10-hanging device, 11-steam generator, 12-condenser, 13-thermometer, 14-heater, 15-drain solenoid valve, 17-heat exchange tube, 18-steam thermometer, 19-condensate thermometer, 20-circulating pump, P-pressure gauge. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0031] Example: Control Figure 1-3

[0032] A circulating water scale prevention dynamic simulation device with intelligent monitoring function comprises a circulating water system and a steam generator 11. The bottom of the steam generator 11 contains water and is provided with a heater 14. The steam generator 11 also comprises a condenser 12. A steam outlet is provided at the top of the steam generator 11. The steam outlet is connected to the condensation inlet of the condenser 12 through a pipeline. The condensation outlet of the condenser 12 is provided with a condensate thermometer 19 for monitoring the temperature of the condensate. The condensate outlet of the condenser 12 discharges the condensate into a high-temperature tank. The bottom outlet of the high-temperature tank is connected to the steam generator 11 through a pipeline to facilitate the condensate to flow back to the steam generator 11. The condensate thermometer 19 is connected to the heater 14 and the alarm system signal through a PLC control system. The condensate thermometer 19 transmits the monitored temperature data to the PLC control system. When the condensate temperature is low, the PLC control system feedbacks and controls the heater 14 to increase the heating power until the condensate temperature reaches the set value range. When the condensate temperature is too high, the PLC control system feedbacks and controls the heater 14 to turn off and controls the alarm system to automatically alarm.

[0033] The circulating water system includes a water inlet device, a cooling system, a film hanger 10 and a heat exchange tube 17. The film hanger 10 includes a transparent glass tube and a hanging plate arranged in the glass tube. The inlet of the heat exchange tube 17 is connected to the water inlet device through a water inlet pipeline. The water inlet device includes a water replenishing tank device 3, a water storage tank 1, a circulating pump 20 and a dosing tank device 2. The water replenishing tank device 3 contains a water sample to be tested, and the dosing tank device 2 contains an antiscalant solution. The water replenishing tank device 3 and the dosing tank device 2 are used to replenish the water sample and the antiscalant solution to the water storage tank 1 respectively. The circulating pump 20 is used to pump out the water sample in the water storage tank 1. The test water in the water storage tank 1 is pumped out by the circulating pump 20 and enters the heat exchange tube 17 through the water inlet pipeline. The water out of the heat exchange tube 17 is cooled by the cooling system and then returned to the water storage tank 1.

[0034] A glass rotor flowmeter 8 is provided on the outlet pipe of the circulation pump 20, and the outlet pipe of the circulation pump 20 is connected to the inlet pipe of the heat exchange pipe 17, and a flow sensor 9 is provided on the inlet pipe, and an inlet branch is provided on the inlet pipe, and a hanging device 10, a conductivity sensor 6, a pH sensor 7 and a corrosion rate sensor 5 are provided on the pipe of the inlet branch. In actual operation, the opening of the control valve on the pipe of the inlet branch is relatively small, that is, only water needs to flow through the pipe of the inlet branch, and the opening of the control valve on the inlet pipe is large, and the flow rate is high, that is, the flow rate monitored by the flow sensor 9 is close to the monitoring flow rate of the glass rotor flowmeter 8.

[0035] The outlet of the heat exchange tube 17 is connected to the cooling system through a water outlet pipeline. A water outlet branch is arranged on the water outlet pipeline. A sheet hanger 10 is arranged on the water outlet branch. The cooling system is then connected to the water inlet device by a pipeline. The test water output by the water inlet device enters the heat exchange tube 17 through the water inlet pipeline. The heat exchange tube 17 is heat exchanged with the hot steam generated by the steam generator 11 to simulate the on-site scale inhibition condition. The outlet water of the heat exchange tube 17 is cooled by the cooling system and then returned to the water inlet device to maintain water circulation. Control valves are arranged on the corresponding pipelines.

[0036] Comparison Figure 1 and Figure 3 The cooling system includes a cooling tower 4, in which a spray head 4a and a packing layer 4b are arranged in sequence from top to bottom. An air inlet is provided on the side of the lower end of the cooling tower 4 and the air inlet is connected to the fan through a pipeline. An air outlet is provided on the top of the cooling tower 4, and the water outlet pipeline penetrates into the cooling tower 4 and is connected to the spray head 4a. A liquid outlet is provided at the bottom of the cooling tower 4 and the liquid outlet is connected to the water storage tank 1 through a pipeline.

[0037] In actual operation, the refluxed hot water is sprayed down through the spray head 4a, and is in reverse contact with the cold air blown in by the fan for heat exchange. This method has high cooling efficiency, but there will be water loss during the cooling process. In order to maintain the liquid level in the water storage tank 1, the present invention also has the following structure: a liquid level meter is provided in the water storage tank 1, and the liquid level meter is connected to the water replenishment tank device 3 through the PLC control system. The liquid level meter transmits the monitored liquid level data to the PLC control system. When the monitored liquid level drops, the PLC control system is fed back and controls the water replenishment tank device 3 to replenish water samples to maintain the balance of the liquid level in the water storage tank 1. Since the water loss rate is low during the above heat exchange cooling process, the water replenishment tank device 3 only needs to maintain a relatively low water replenishment rate.

[0038] Furthermore, two buffer chambers are symmetrically arranged on opposite sides of the upper end of the steam generator 11, and a thermometer 13 for measuring the water temperature is arranged on the buffer chamber. The heat exchange tube 17 of the circulating water system is detachably installed between the two buffer chambers, and the heat exchange tube 17 is horizontally placed in the upper end of the steam generator 11. Therefore, the inlet water temperature and the outlet water temperature of the heat exchange tube 17 can be conveniently detected.

[0039] In order to better conduct multiple groups of experiments, the number of circulating water systems is two or more, and the heat exchange tubes 17 of each circulating water system are detachably installed in the upper end of the steam generator 11. Therefore, the present application adopts a dual waterway process or a multi-waterway process when conducting experiments, which can not only conduct parallel comparative tests on water samples containing antiscalant solutions of the same formula, but also conduct performance screening tests on water samples containing antiscalant solutions of different formulas.

[0040] In addition, since some water will be lost during the heat exchange cooling process of the cooling tower 4, the water sample in the water tank 1 is slowly concentrated (the water sample contains a certain amount of electrolyte salts such as NaCl), and the concentration of the electrolyte slowly increases. When the concentration multiple exceeds a certain value, sewage treatment is required. Therefore, the present invention also provides the following structure: the outlet water pipeline of the heat exchange tube 17 is divided into two paths, one of which is connected to the spray head 4a in the cooling tower 4 through a pipeline, and the other is connected to the sewage solenoid valve 15, so as to facilitate the discharge of the outlet water to the ditch through the sewage solenoid valve 15. The conductivity sensor 6 is connected to the water replenishment tank device 3, the drug adding tank device 2 and the sewage discharge electromagnetic valve 15 through the PLC control system. The conductivity sensor 6 transmits the monitored conductivity data to the PLC control system. When the monitored conductivity data exceeds the set value, the PLC control system feedbacks and controls the sewage discharge electromagnetic valve 15 to open for sewage discharge, and controls the water replenishment tank device 3 to replenish water samples at a flow rate that is the same as or slightly higher than the sewage discharge flow rate of the sewage discharge electromagnetic valve 15 to maintain the balance of the liquid level in the water storage tank 1, and controls the drug adding tank device 2 to accurately control the amount of scale inhibitor solution added to replenish the amount of scale inhibitor solution lost due to sewage discharge by the sewage discharge electromagnetic valve 15, until the monitored conductivity data reaches the normal range, and then closes the sewage discharge electromagnetic valve 15 and stops the water replenishment tank device 3 from replenishing water samples and the drug adding tank device 2 from adding drugs. The PLC control system then feedbacks and controls whether the water replenishment tank device 3 replenishes water samples through the monitoring signal of the liquid level meter in the water storage tank 1. That is, the PLC control system processes the signal from the conductivity sensor 6 first, and then processes the monitoring signal from the liquid level meter.

[0041] Comparison Figure 2 The steam generator 11 is also provided with a steam thermometer 18 for monitoring the steam temperature. Figure 3 The water tank 1 is connected to a pressure gauge P through a pipeline.

[0042] During the test of this application, circulating water (water sample can be river water or groundwater) is added to the water storage tank 1 through the water replenishment tank device 3, and the dosage of the scale inhibitor solution is accurately controlled through the dosing tank device 2. The test water enters the heat exchange tube through the pipeline, and the heat exchange tube is heat exchanged with the steam of the steam generator to simulate the field working conditions. Various sensors and flow meters arranged on the circulation pipeline can record the instantaneous flow of circulating cooling water, the inlet water temperature of the heat exchange tube, the outlet water temperature of the heat exchange tube, the temperature difference, the steam temperature, the conductivity, the pH value, the corrosion rate, the replenishment water flow and other parameters.

[0043] The contents described in this specification are merely an enumeration of implementation forms of the inventive concept, and the protection scope of the present invention should not be regarded as being limited to the specific forms described in the embodiments.

Claims

1. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function, characterized in that including a circulating water system and a steam generator (11), The bottom of the steam generator (11) contains water and is provided with a heater (14); The circulating water system comprises a water inlet device, a cooling system, a sheet hanger (10) and a heat exchange tube (17). The heat exchange tube (17) is detachably installed in the upper end of the steam generator (11). The inlet of the heat exchange tube (17) is connected to the water inlet device through a water inlet pipeline. A water inlet branch is arranged on the water inlet pipeline. The sheet hanger (10) and the corrosion rate sensor (5) are arranged on the pipeline of the water inlet branch. The outlet of the heat exchange tube (17) is connected to the cooling system through a water outlet pipeline. A water outlet branch is arranged on the water outlet pipeline. The sheet hanger (10) is arranged on the water outlet branch. The cooling system is connected to the water inlet device through a pipeline. Test water output by the water inlet device enters the heat exchange tube (17) through the water inlet pipeline. The heat exchange tube (17) is heat-exchanged with the hot steam generated by the steam generator (11) to simulate the on-site scale inhibition working condition. The water outlet of the heat exchange tube (17) is cooled by the cooling system and then returned to the water inlet device to maintain water circulation. Control valves are arranged on the corresponding pipelines.

2. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 1, characterized in that The water inlet device comprises a water replenishing tank device (3), a water storage tank (1), a circulating pump (20) and a drug adding tank device (2). The water replenishing tank device (3) contains a water sample to be tested, and the drug adding tank device (2) contains a scale inhibitor solution. The water replenishing tank device (3) and the drug adding tank device (2) are respectively used to replenish the water sample and the scale inhibitor solution to the water storage tank (1). The test water in the water storage tank (1) is pumped out by the circulating pump (20) and enters the heat exchange tube (17) through the water inlet pipeline. The water outlet of the heat exchange tube (17) is cooled by the cooling system and then returned to the water storage tank (1).

3. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 2, characterized in that The water outlet pipeline at the outlet of the heat exchange tube (17) is divided into two paths, one of which is connected to the cooling system through a pipeline, and the other is connected to the sewage discharge solenoid valve (15), so as to facilitate the discharge of the water to the ditch through the sewage discharge solenoid valve (15); A conductivity sensor (6) and a pH sensor (7) are also provided on the pipeline of the water inlet branch. The conductivity sensor (6) is connected to the water replenishment tank device (3), the dosing tank device (2) and the sewage discharge solenoid valve (15) through a PLC control system. The conductivity sensor (6) transmits the monitored conductivity data to the PLC control system. When the monitored conductivity data exceeds a set value, the PLC control system provides feedback and controls the sewage discharge solenoid valve (15) to open for sewage discharge, and controls the water replenishment tank device (3) to replenish water samples to maintain the balance of the liquid level in the water storage tank (1), and controls the dosing tank device (2) to accurately control the amount of the scale inhibitor solution added to replenish the amount of the scale inhibitor solution lost due to sewage discharge by the sewage discharge solenoid valve (15), until the monitored conductivity data reaches a normal range.

4. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 2, characterized in that The cooling system comprises a cooling tower (4), wherein a spray head (4a) and a packing layer (4b) are arranged in sequence from top to bottom inside the cooling tower (4), an air inlet is arranged at the side of the lower end of the cooling tower (4), and the air inlet is connected to a fan via a pipeline, an air outlet is arranged at the top of the cooling tower (4), the water outlet pipeline penetrates into the cooling tower (4) and is connected to the spray head (4a), and a liquid outlet is arranged at the bottom of the cooling tower (4), and the liquid outlet is connected to a water storage tank (1) via a pipeline.

5. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 4, characterized in that A liquid level meter is provided in the water storage tank (1), and the liquid level meter is connected to the water replenishment tank device (3) through a PLC control system. The liquid level meter transmits monitored liquid level data to the PLC control system. When the monitored liquid level drops, the PLC control system provides feedback and controls the water replenishment tank device (3) to replenish water samples, so as to maintain the liquid level in the water storage tank (1) in balance.

6. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 2, characterized in that A glass rotor flowmeter (8) is provided on the water outlet pipeline of the circulation pump (20); the water outlet pipeline of the circulation pump (20) is connected to the water inlet pipeline of the heat exchange tube (17); and a flow sensor (9) is provided on the water inlet pipeline.

7. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 1, characterized in that Two buffer cavities are symmetrically arranged on opposite sides of the upper end of the steam generator (11), and a thermometer (13) for measuring the water temperature is arranged on the buffer cavities. The heat exchange tube (17) of the circulating water system is detachably installed between the two buffer cavities, and the heat exchange tube (17) is horizontally placed inside the upper end of the steam generator (11).

8. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 1, characterized in that The number of the circulating water systems is two or more, and the heat exchange tubes (17) of each circulating water system are detachably installed in the upper end of the steam generator (11).

9. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 1, characterized in that It also includes a condenser (12), a steam outlet is arranged at the top of the steam generator (11), the steam outlet is connected to the condensation inlet of the condenser (12) through a pipeline, the condensation outlet of the condenser (12) is provided with a condensation liquid thermometer (19) for monitoring the temperature of the condensate, the condensation outlet of the condenser (12) discharges the condensate into a high-temperature tank, and the liquid outlet at the bottom of the high-temperature tank is connected to the steam generator (11) through a pipeline to facilitate the reflux of the condensate into the steam generator (11); The condensate thermometer (19) is connected to the heater (14) and the alarm system signal through the PLC control system. The condensate thermometer (19) transmits the monitored temperature data to the PLC control system. When the condensate temperature is low, the PLC control system provides feedback and controls the heater (14) to increase the heating power until the condensate temperature reaches within the set value range. When the condensate temperature is too high, the PLC control system provides feedback and controls the heater (14) to turn off and controls the alarm system to automatically alarm.

10. A circulating water scale inhibition dynamic simulation device with intelligent monitoring function as claimed in claim 1, characterized in that The film hanger (10) comprises a transparent glass tube and a hanging film arranged in the glass tube.

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