Evaporator performance test experimental platform

Abstract

The utility model relates to an evaporator performance test experimental platform, which comprises an evaporator, a preheater, a liquid storage tank, a liquid storage tank, a liquid storage tank, a liquid storage tank, a liquid storage tank, a liquid storage tank and a liquid storage tank, the condenser is used for cooling the medium I from the tube pass outlet in the evaporator and conveying the medium I to the liquid storage tank; the liquid storage tank is used for storing a first medium, providing the first medium for the evaporator and recycling the first medium after heat exchange of the condenser; the sight glass is used for observing whether the medium I from the outlet of the tube pass is in a vapor state or a vapor-liquid mixture, and then selecting whether the medium I is directly sent to the condenser or is separated by the separation tank, and then the vapor medium I is sent to the condenser and the liquid medium I is sent to the liquid storage tank; and the electric heater is used for heating the second medium sent by the fan and then sending the second medium to the inlet of the evaporator. According to the utility model, an evaporator heat exchange model is optimized, and a flue gas heat exchanger performance experiment platform is established.

Description

TECHNICAL FIELD

[0001] The utility model relates to an experimental platform, especially to an experimental platform for testing the performance of an evaporator. BACKGROUND

[0002] An evaporator is a heat exchange device, which functions to exchange heat between two media, so that one of the media is evaporated to increase its temperature. In the low-temperature flue gas organic Rankine cycle waste heat power generation technology, for example, the performance of the evaporator plays a key role in the thermal efficiency. However, there is no device in the prior art for testing the performance of the evaporator alone, and thus the heat exchange performance of the evaporator cannot be determined.

[0003] Therefore, there is a need for a platform capable of testing the performance of an evaporator according to various parameters, so as to provide a reference for the actual use of the evaporator. SUMMARY

[0004] To solve the above technical problems, the utility model provides an evaporator performance test experimental platform, which aims to test the heat exchange performance of the evaporator under various working conditions. The inlet parameters of the two heat exchange media can be adjusted, and the inlet and outlet pressures, temperatures and flow rates of the two heat exchange media can be tested. The heat exchange performance of the evaporator can be tested through a small-scale test, thereby guiding the design and manufacture of the heat exchanger on site.

[0005] To achieve the above purpose, the utility model discloses an evaporator performance test experimental platform, which comprises an evaporator. The evaporator is generally a tubular heat exchanger, and a heat exchange pipeline is arranged in the evaporator. Medium one flows through the tube, and medium two flows through the shell. The evaporator performance test experimental platform further comprises:

[0006] a preheater for heating medium one delivered from a liquid storage tank to the inlet of the tube;

[0007] a condenser for cooling medium one discharged from the outlet of the tube in the evaporator and sending the medium one to the liquid storage tank;

[0008] a liquid storage tank for storing medium one and providing medium one to the evaporator and recovering medium one after heat exchange in the condenser;

[0009] a sight glass for observing whether the medium one discharged from the outlet of the tube is in a gaseous state or a gaseous-liquid mixed state, and then selecting whether to send the medium one directly to the condenser or to send the gaseous medium one to the condenser and the liquid medium one to the liquid storage tank after separation in a separation tank;

[0010] an electric heater for heating medium two delivered by a fan and then sending the medium two to the inlet of the evaporator;

[0011] a fan for sending medium two discharged from the evaporator to the electric heater.

[0012] The shell side inlet and outlet of the evaporator medium two are communicated with the inlet pipe and the outlet pipe respectively, the tube side inlet of the evaporator is arranged at one side of the shell side outlet end of the evaporator medium two, the shell side outlet of the evaporator is arranged at one side of the shell side inlet end of the evaporator medium two, the tube side inlet is connected with the preheater outlet through the first pipeline, the preheater inlet is connected with the working medium pump through the pipeline, the working medium pump is connected with the liquid storage tank through the pipeline, the liquid storage tank is connected with the condenser outlet through the pipeline, the condenser inlet is connected with the second pipeline through the pipeline, and the second pipeline is communicated with the tube side outlet.

[0013] The first pressure gauge and the first thermometer are arranged on the inlet pipe, the sixth thermometer is arranged on the outlet pipe, and the first pressure difference gauge is arranged between the inlet pipe and the outlet pipe; the second pressure gauge and the second thermometer are arranged on the second pipeline, the third pressure gauge and the third thermometer are arranged on the first pipeline, and the second pressure difference gauge is arranged between the first pipeline and the second pipeline.

[0014] The outlet of the fan is provided with a wind speed sensor.

[0015] The first pipeline is provided with the first stop valve, the preheater is provided with the first flow meter, the first flow meter is provided with the fourth pressure gauge and the fourth thermometer, the working medium pump is provided with the first check valve, the second stop valve and the back pressure valve, the back pressure valve is provided with the pulse damper, the working medium pump is provided with the third stop valve and the filter, and the preheater is a constant temperature oil bath box.

[0016] The liquid storage tank is provided with the fifth pressure gauge, the fifth thermometer and the fourth stop valve.

[0017] The condenser is provided with the fifth stop valve, the seventh stop valve and the second check valve.

[0018] The fifth stop valve is provided with parallel pipelines at two ends, and the sixth stop valve, the sight glass and the separation tank are arranged on the parallel pipelines.

[0019] The separation tank is connected to the liquid storage tank through the pipeline.

[0020] The pipeline between the separation tank and the liquid storage tank is provided with the eighth stop valve and the second flow meter.

[0021] The utility model discloses the advantages and effects:

[0022] The utility model discloses can conveniently adjust two kinds of heat exchange medium's import parameter, through the test of two kinds of heat exchange medium import and export pressure, temperature, flow, through the test of evaporimeter heat exchange performance to the design and manufacture of guiding the scene heat exchanger, can according to the measured parameter optimization heat exchanger's calculation model, select suitable heat exchange correlation formula, or deduce new heat exchange correlation formula. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is the connection schematic diagram of the utility model.

[0024] Fig. 2 It is the evaporimeter structure schematic diagram of the utility model.

[0025] Fig. 3 It is the organic working medium pipeline structure schematic diagram of the utility model.

[0026] In the drawing: 1, evaporimeter;2, organic working medium pipeline;3, import pipe;4, export pipe;5, electric heater;6, fan;7, first pipeline;8, preheater;9, working medium pump;10, liquid storage tank;11, condenser;12, second pipeline;13, first pressure gauge;14, first thermometer;15, sixth thermometer;16, first differential pressure gauge;17, wind speed sensor;18, second pressure gauge;19, second thermometer;20, third pressure gauge;21, third thermometer;22, second differential pressure gauge;23, first stop valve;24, first flowmeter;25, fourth pressure gauge;26, fourth thermometer;27, first check valve;28, second stop valve;29, back pressure valve;30, pulse damper;31, third stop valve;32, filter;33, fifth pressure gauge;34, fifth thermometer;35, fourth stop valve;36, fifth stop valve;37, seventh stop valve;38, second check valve;39, sixth stop valve;40, sight glass;41, separation tank;42, eighth stop valve;43, second flowmeter. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the embodiments of the utility model and the drawings, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, and the protection scope of the utility model is not limited to the embodiments.

[0028] As heat exchange equipment, the evaporimeter is very important for the heat exchange efficiency in the waste heat utilization system, especially in the flue gas waste heat power generation system of the electrolytic aluminum plant, the medium after heat exchange is used for power generation, and the heat exchange efficiency is more critical.

[0029] Therefore, it is necessary to calculate the evaporator heat exchange coefficient under the conditions of import and export temperature, pressure difference, medium one import and export temperature, pressure difference and the like. The heat exchange pipeline used in the embodiment is an organic working medium pipeline, and the medium one is organic working medium r245fa, and the medium two is air.

[0030] Then, as shown in Figs. 1-3 The evaporator performance test experiment platform of the utility model, including evaporator 1, evaporator is the pipe heat exchanger, be equipped with heat exchange pipeline in evaporator 1, this heat exchange pipeline is organic working medium pipeline 2, the organic working medium pipeline of this embodiment is by multiple finned tube series connection, and each finned tube is longitudinally arranged in evaporator 1.

[0031] The evaporator performance test experiment platform further includes:

[0032] A preheater is used to heat the medium one delivered from the liquid storage tank to the import of the organic working medium pipeline;

[0033] A condenser is used to cool the medium one exported from the outlet of the organic working medium pipeline in the evaporator and send it to the liquid storage tank;

[0034] A liquid storage tank is used to store the medium one and provide the medium one to the evaporator and recycle the medium one after heat exchange of the condenser;

[0035] A sight glass is used to observe whether the medium one exported from the outlet of the organic working medium pipeline is in a gaseous state or a gaseous-liquid mixed state, and then select whether to directly send it to the condenser or send the gaseous medium one to the condenser and the liquid medium one to the liquid storage tank after separation by a separation tank;

[0036] An electric heater is used to heat the medium two delivered by the fan and then send the medium two to the import of the evaporator;

[0037] A fan is used to send the medium two exported from the evaporator to the electric heater.

[0038] Wherein: the inlet and outlet of the evaporator medium two are communicated with the inlet pipe 3 and the outlet pipe 4 respectively, the other end of the inlet pipe 3 is connected with the outlet of the electric heater 5 through a pipeline, the other end of the outlet pipe 4 is connected with the fan 6 through a pipeline, the outlet of the fan 6 is communicated with the inlet of the electric heater 5, the inlet of the organic working medium pipeline 2 of the evaporator 1 is arranged at one side of the outlet end of the evaporator medium two, the outlet of the organic working medium pipeline 2 of the evaporator 1 is arranged at one side of the inlet end of the evaporator medium two, the inlet of the organic working medium pipeline 2 is connected with the outlet of the preheater 8 through the first pipeline 7, the inlet of the preheater 8 is connected with the working medium pump 9 through a pipeline, the working medium pump 9 is connected with the liquid storage tank 10 through a pipeline, the liquid storage tank 10 is connected with the outlet of the condenser 11 through a pipeline, the inlet of the condenser 11 is connected with the second pipeline 12 through a pipeline, the second pipeline 12 is communicated with the outlet of the organic working medium pipeline 2. The first pressure gauge 13 and the first thermometer 14 are arranged on the inlet pipe 3 for measuring the pressure and temperature of the medium two entering the evaporator 1, the sixth thermometer 15 is arranged on the outlet pipe 4 for measuring the outlet temperature of the evaporator, the first differential pressure gauge 16 is arranged between the inlet pipe 3 and the outlet pipe 4 for measuring the pressure difference of the medium two entering and exiting the evaporator; the wind speed sensor 17 is arranged at the outlet of the fan 6 for measuring the wind speed entering the electric heater 5; the second pressure gauge 18 and the second thermometer 19 are arranged on the second pipeline 12 for measuring the pressure and temperature of the medium one out of the organic working medium pipeline 2, the third pressure gauge 20 and the third thermometer 21 are arranged on the first pipeline 7 for measuring the pressure and temperature of the medium one flowing into the organic working medium pipeline 2, the second differential pressure gauge 22 is arranged between the first pipeline 7 and the second pipeline 12 for measuring the pressure difference of the medium one between the first pipeline 7 and the second pipeline 12, and then the working parameters of the evaporator 1 are obtained according to these instruments.

[0039] The first stop valve 23 is arranged on the pipeline between the first pipeline 7 and the preheater 8, the preheater 8 is a constant temperature oil bath box in the embodiment, the first flowmeter 24 is arranged on the pipeline between the constant temperature oil bath box and the working medium pump 9, the fourth pressure gauge 25 and the fourth thermometer 26 are arranged on the pipeline between the first flowmeter 24 and the constant temperature oil bath box for monitoring the pressure and temperature of the medium one entering the constant temperature oil bath box, and the temperature of the medium one is adjusted through the constant temperature oil bath box, so that the medium one output by the constant temperature oil bath box meets the needs of the evaporator.

[0040] The first check valve 27, the second stop valve 28 and the back pressure valve 29 are arranged in sequence on the pipeline between the working medium pump 9 and the first flowmeter 24, the pulse damper 30 is arranged on the pipeline between the back pressure valve 29 and the first flowmeter 24, and this structure can avoid the problem that the medium one is not smooth when it is transported through the working medium pump 9.

[0041] The third stop valve 31 and the filter 32 are arranged between the working medium pump 9 and the liquid storage tank 10, the medium I from the liquid storage tank 10 is filtered, and the quality of the medium I is improved; the liquid charging pipe is arranged on the liquid storage tank 10 and is used for supplementing the medium I.

[0042] The fifth pressure gauge 33, the fifth temperature gauge 34 and the fourth stop valve 35 are arranged between the liquid storage tank 10 and the condenser 11, and are used for measuring the pressure and the temperature of the medium I from the condenser 11. The water pump is arranged on the pipeline of the condenser 11, so that the water pump sends the cold water to the condenser 11, the medium I in the condenser 11 is cooled, and then the medium I is sent to the liquid storage tank 10. The condenser 11 in the embodiment is a plate heat exchanger.

[0043] The fifth stop valve 36, the seventh stop valve 37 and the second check valve 38 are sequentially arranged on the pipeline between the condenser 11 and the second pipeline 12, the fifth stop valve 36 is provided with parallel pipelines at two ends, the sixth stop valve 39, the sight glass 40 and the separation tank 41 are arranged on the parallel pipelines, when the evaporator 1 is experimented, the medium I from the evaporator 1 may be in a gaseous-liquid mixture state due to the need of controlling different temperatures of the medium I, so it is needed to judge whether the medium I in the sight glass 40 is in a gaseous state or in a gaseous-liquid mixture state, if the medium I is in the gaseous state, the sixth stop valve 39 is closed, and the fifth stop valve 36 is opened, so that the medium I is directly sent to the condenser 11; if the medium I is in the gaseous-liquid mixture state, the fifth stop valve 36 is closed, so that the medium I in the gaseous-liquid mixture state is separated in the separation tank 41, the separated gas is sent to the condenser, and the liquid is directly returned to the liquid storage tank 10, so that the separation tank 41 is connected to the liquid storage tank 10 through the pipeline, the eighth stop valve 42 and the second flowmeter 43 are arranged on the pipeline between the separation tank 41 and the liquid storage tank 10, and the flow of the medium I from the separation tank 41 to the liquid storage tank 10 can be measured.

[0044] The parameters of the components in the evaporator are as follows: the fin top diameter of the finned tube is 50 mm, the fin height is 12.5 mm, the outer diameter of the tube is 25 mm, the inner diameter of the tube is 20 mm, the distance between the fins is 8 mm, the fin thickness is 0.8 mm, the distance between the centers of the two longitudinal finned tubes is 78 mm, the distance between the centers of the two transverse finned tubes is 90 mm, and the fin efficiency is 0.91. The following parameters are measured when the experiment is conducted: the inlet temperature of the evaporator medium I is 98.91 DEG C, the outlet temperature is 126.62 DEG C, the mass flow of the medium I is 125.14 kg / h, the inlet pressure of the evaporator medium I is 14.14 bar, and the corresponding evaporation temperature is 105.10 DEG C; the inlet pressure of the evaporator medium I is 13.96 bar, and the corresponding evaporation temperature is 104.51 DEG C. The shell inlet medium II temperature is 135 DEG C, and the shell outlet medium II temperature is 116.68 DEG C.

[0045] Through the above data, the heat transfer area of sub-cooling zone, two-phase zone and super-heating zone in the evaporator can be obtained by theoretical calculation using the existing correlation. Compared with the actual area of the heat exchanger, the error of the correlation can be obtained, which is of great significance for optimizing the evaporator model and determining whether the evaporator can be applied to the field.

Claims

1. An evaporator performance test experiment platform, comprising an evaporator, a heat exchange pipeline is arranged in the evaporator, and the platform is characterized in that Also include: A preheater for heating the medium one delivered to the tube side inlet; A condenser for cooling the medium one from the tube side outlet of the evaporator and sending it to the storage tank; A storage tank for storing medium one and providing medium one to the evaporator and recovering medium one after heat exchange in the condenser; A sight glass for observing whether the medium one from the tube side outlet is in a gaseous state or a gas-liquid mixture, then choosing whether to send it directly to the condenser or to send the gaseous medium one to the condenser after separation in the separation tank and to send the liquid medium one to the storage tank; An electric heater for heating the medium two sent by the fan and then sending it to the evaporator inlet; A fan for sending the medium two from the evaporator to the electric heater.

2. The evaporator performance test experimental platform according to claim 1, characterized in that The evaporator medium two inlet and outlet are respectively connected with the inlet pipe and outlet pipe, the evaporator tube side inlet is arranged at one side of the evaporator medium two shell side outlet end, the evaporator tube side outlet is arranged at one side of the evaporator medium two shell side inlet end, the tube side inlet is connected with the preheater outlet through the first pipeline, the preheater inlet is connected with the working medium pump through the pipeline, the working medium pump is connected with the storage tank through the pipeline, the storage tank is connected with the condenser outlet through the pipeline, the condenser inlet is connected with the second pipeline through the pipeline, and the second pipeline is communicated with the tube side outlet.

3. The evaporator performance test experimental platform according to claim 2, characterized in that The first pressure gauge and the first thermometer are arranged on the inlet pipe, the sixth thermometer is arranged on the outlet pipe, and the first differential pressure gauge is arranged between the inlet pipe and the outlet pipe; the second pressure gauge and the second thermometer are arranged on the second pipeline, the third pressure gauge and the third thermometer are arranged on the first pipeline, and the second differential pressure gauge is arranged between the first pipeline and the second pipeline.

4. The evaporator performance test experimental platform of claim 1, wherein The outlet of the fan is provided with a wind speed sensor.

5. The evaporator performance test experimental platform according to claim 2, characterized in that The pipeline between the first pipeline and the preheater is provided with a first stop valve, the pipeline between the preheater and the working medium pump is provided with a first flowmeter, the pipeline between the first flowmeter and the preheater is provided with a fourth pressure gauge and a fourth thermometer, the pipeline between the working medium pump and the first flowmeter is sequentially provided with a first check valve, a second stop valve and a back pressure valve, the pipeline between the back pressure valve and the first flowmeter is provided with a pulse damper, and the working medium pump and the storage tank are provided with a third stop valve and a filter, wherein the preheater is a constant temperature oil bath box.

6. The evaporator performance test experimental platform according to claim 5, characterized in that The fifth pressure gauge, the fifth thermometer and the fourth stop valve are arranged between the storage tank and the condenser.

7. The evaporator performance test experimental platform according to claim 6, characterized in that The fifth stop valve is provided with parallel pipelines at both ends, and the parallel pipelines are provided with a sixth stop valve, a sight glass and a separation tank.

8. The evaporator performance test experimental platform according to claim 7, characterized in that The separation tank is connected to the storage tank through a pipeline.

9. The evaporator performance test experimental platform according to claim 8, characterized in that The eighth stop valve and the second flowmeter are arranged on the pipeline between the separation tank and the storage tank.

10. The evaporator performance test experimental platform of claim 9, wherein ​

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