CN109855900B - Comprehensive test experiment system for lifting film evaporator - Google Patents
Comprehensive test experiment system for lifting film evaporator Download PDFInfo
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- CN109855900B CN109855900B CN201910267773.9A CN201910267773A CN109855900B CN 109855900 B CN109855900 B CN 109855900B CN 201910267773 A CN201910267773 A CN 201910267773A CN 109855900 B CN109855900 B CN 109855900B
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- 238000005259 measurement Methods 0.000 claims abstract description 14
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- 239000008236 heating water Substances 0.000 claims abstract description 10
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 239000010408 film Substances 0.000 claims description 49
- 239000011552 falling film Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
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- 230000008859 change Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
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Abstract
The invention discloses a lifting film evaporation/reboiler comprehensive test experiment system. Comprising the following steps: the cooling medium pipeline unit comprises a heating water tank, a centrifugal pump, a turbine flowmeter, a small heat exchanger, various valves and connecting pipelines; the steam pipeline unit comprises a steam generator, a pressure stabilizing tank, a steam regulating valve, a vortex shedding flowmeter, a condensing tank, various valves and connecting pipelines; the test heat exchanger unit comprises a main heat exchanger, a gas-liquid separator, a plate heat exchanger and a connecting pipeline; the data measurement and control unit comprises flow measurement and control, temperature measurement and control, pressure measurement and control and condensate measurement. The comprehensive test experimental system for the lifting film evaporator has the advantages of compact structure, convenient operation, low operation cost and reliable performance, can accurately simulate the operation working conditions of the lifting film evaporator/reboiler under various working conditions in actual industrial production, and can carry out comparative test on the flow of the liquid film evaporator/reboiler and the heat transfer performance of the optimized heat transfer element, thereby providing theoretical basis for design.
Description
Technical Field
The invention relates to the field of thermal experimental equipment, in particular to a test experimental system for an elevating film evaporation/reboiler.
Background
The liquid film type evaporation/reboiler has the advantages of short residence time of liquid in the heat exchange tube, small pressure drop, high heat transfer coefficient, high steam utilization rate, difficult scaling, convenient cleaning, wide material liquid treatment range and the like, and is widely applied to the fields of chemical industry, oil refining, energy, aerospace, sea water desalination, refrigeration and the like, and particularly used in a large amount in chemical fiber and chlor-alkali production devices such as ethylene glycol, ethanolamine, acrylic fiber, terylene and the like in petrochemical industry.
However, the existing experimental devices are all experimental devices for singly researching the lifting film or the falling film, the lifting film can not be combined and simultaneously compared and researched, and meanwhile, a plurality of experimental tables with different functions are arranged, so that the occupied area is large, the investment is large, a large amount of resources are wasted, and the accuracy and the reliability of the test result are directly influenced by the testing performance of the different experimental tables; in industrial actual production, the flow range, the physical properties of working medium solution, the evaporation capacity and the like under different working conditions are large, and the single pipeline of the existing experimental device is limited by the limitation of the conditions such as the application range of a flowmeter, and the operation conditions of various working conditions are difficult to accurately simulate; the design of the liquid distribution device under different working media and flow has direct influence on the falling film evaporation effect, and in the existing experimental device, the switching of different types of liquid distributors cannot be realized.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of providing the comprehensive test experiment system for the lifting film evaporator/reboiler, which has the advantages of compact structure, convenient operation, low running cost and reliable performance, can accurately simulate the running working conditions of the lifting film evaporator/reboiler under various working conditions in actual industrial production, and can carry out comparative test on the flow of the liquid film evaporator/reboiler and the heat transfer performance of the optimized heat transfer element, thereby providing theoretical basis for the design of the novel efficient lifting film evaporator/reboiler.
The technical scheme of the invention is that the comprehensive test experiment system of the lifting film evaporator comprises a cooling medium pipeline unit, a steam pipeline unit, a test heat exchanger unit and a data measurement and control unit, wherein the units are connected through pipelines or corresponding connecting elements;
in the cooling medium pipeline unit, an outlet of the heating water tank (1) is connected with an inlet of the centrifugal pump (4), and an outlet of the centrifugal pump (4) is respectively connected with the first turbine flowmeter (6-1) and the second turbine flowmeter (6-2) through a first parallel pipeline (5); the outlets of the first turbine flowmeter (6-1) and the second turbine flowmeter (6-2) are connected with a main heat exchanger through a cooling medium pipeline and a regulating valve (7), and the main heat exchanger is communicated with the heating water tank (1) through a small heat exchanger (17);
in the steam pipeline unit, a steam generator (11) is sequentially connected with a pressure stabilizing tank (12), a steam regulating valve (13) and a vortex shedding flowmeter (14) through pipelines, the vortex shedding flowmeter (14) is connected with a shell side inlet of a main heat exchanger, and an outlet of the main heat exchanger is connected with a condensing tank (20);
in the test heat exchanger unit, the main heat exchanger comprises a climbing film type sleeve heat exchanger (22-2) and a falling film type sleeve heat exchanger (22-1), and is respectively connected with corresponding gas-liquid separators in phase through pipelines, and then is connected with corresponding plate heat exchangers to complete the heat exchange process of cold and hot media and the gas-liquid separation process of the cold media;
the pipe side and the shell side outlet of the main heat exchanger (22) are respectively provided with a differential pressure transmitter and a temperature sensor, and the heat exchange pipe of the main heat exchanger is provided with the temperature sensor and is also provided with a condensate quality measuring device.
The data measurement and control unit comprises flow measurement and control, temperature measurement and control, pressure measurement and control and condensate measurement, a first turbine flowmeter (6-1) and a second turbine flowmeter (6-2) of a cooling medium pipeline, a vortex shedding flowmeter (14) of a steam pipeline, a differential pressure transmitter and a temperature sensor are respectively installed at the pipe side and the shell side outlet of a main heat exchanger (22), a temperature sensor (24) is also installed on the heat exchange pipe of the main heat exchanger, and an electronic balance is arranged to measure the condensate mass.
In the lifting film evaporator comprehensive test experiment system, preferably, the lifting film type double-pipe heat exchanger (22-2) and the falling film type double-pipe heat exchanger (22-1) are respectively connected with a second gas-liquid separator (9-2) and a first gas-liquid separator (9-1) which are in phase correspondence through pipelines, and the second gas-liquid separator (9-2) is connected with the plate type heat exchanger (10) to complete the heat exchange process of cold and hot media and the gas-liquid separation process of the cold media.
In the lifting film evaporator comprehensive test experiment system, the plate heat exchanger (10) and the steam generator (11) are preferably connected with the water softener (19) respectively.
In order to reduce experimental errors and prevent scaling of experimental devices, the experimental system is externally connected with a set of water softening device, the experimental system uses cooling water used by heat exchangers such as water, a plate heat exchanger (10) and the like, and the steam generator (11) uses deionized water treated by the water softening device (19).
In the lifting film evaporator comprehensive test experiment system, the cooling medium pipeline is preferably connected with the pipe side inlet of the main heat exchanger through a second parallel pipeline (8).
Preferably, a regulating valve (7) is arranged between the first parallel pipeline (5) and the second parallel pipeline (8).
By switching the valves, the type of main heat exchanger being tested can be selected.
In the lifting film evaporator comprehensive test experiment system, preferably, the steam pipeline unit is connected with shell side inlets of the lifting film type double-pipe heat exchanger (22-2) and the falling film type double-pipe heat exchanger (22-1) through a third parallel pipeline (15); the connection of the shell-side outlet of the main heat exchanger to the condenser tank (20) is accomplished by a fourth parallel line (21).
The type of the main heat exchanger can be selected through the switching of the valve; by switching the valve, condensate can be timely discharged into the condensing tank.
In the lifting film evaporator comprehensive test experiment system, the lifting film type double-pipe heat exchanger (22-2) and the falling film type double-pipe heat exchanger (22-1) are preferably respectively provided with an upper sight glass and a lower sight glass (23).
Further, a liquid distribution device (16) is arranged at the upper end of the falling film type double pipe heat exchanger (22-1).
Further, the liquid distribution device is provided with a sight glass.
Different types of pipe orifice film distributor can be arranged on the heat exchanger, and the liquid distribution device is provided with a sight glass, so that the distribution flow state of the liquid medium can be better observed.
In the lifting film evaporator comprehensive test experimental system, preferably, the turbine flowmeter (6), the vortex shedding flowmeter (14) and the temperature sensor (24) are connected with a computer (28) through a multi-channel test recorder (26); the data of the differential pressure transmitter (25) is collected by an electric control cabinet (27) and is output to a computer (28) for display.
Compared with the prior art, the invention has the following main advantages:
1. the experimental system combines the heat transfer of the lifting film and performs contrast research, and can perform contrast analysis on the flow and heat transfer performance of the lifting film system and the falling film system under the actual working condition through the experimental system, so that theoretical basis is provided for the design of the film evaporation/reboiler, the system has compact structure, convenient operation and low running cost, and the defects of large occupied area, resource waste and the like due to the arrangement of a plurality of test tables are overcome.
2. The accuracy and reliability of the test result of the experimental system are greatly improved, the design is optimized in many places in the experimental system, the operation condition of the lifting film evaporation/reboiler under the actual working condition can be accurately simulated, the data control unit can track and monitor the change condition of the temperature, the pressure and the flow of the experimental working medium and the steam in the system in real time, and the test precision is high.
3. The experimental system is convenient to disassemble and assemble, the experimental system is composed of four units, each unit is relatively independent, the disassembly and assembly are quite simple, the replacement of a single heat exchange element can be realized at any time, the experimental system can simulate the actual operation condition, and can also carry out contrast test on the flow in the actual equipment and the heat transfer performance after the optimization of the heat transfer element, so that a theoretical basis is provided for the design of the novel efficient lifting film type evaporation/reboiler.
Drawings
FIG. 1 is a schematic diagram of a lifting film evaporation/reboiler integrated test experiment system according to the present invention;
FIG. 2 is a schematic diagram of a data measurement and control unit of a lifting film evaporation/reboiler comprehensive test experiment system according to the present invention;
FIG. 3 is a schematic diagram of the system operation under the condition of lifting the film of the test system for comprehensively testing the lifting film evaporation/reboiler according to the present invention;
fig. 4 is a schematic diagram of the system operation under the condition of falling film of the comprehensive test experiment system of the lifting film evaporation/reboiler.
In the figure, 1, a heating water tank, 2, a threaded ball valve, 3, a Y-shaped filter, 4, a centrifugal pump, 5, a first parallel pipeline, 6-1, a first turbine flowmeter, 6-2, a second turbine flowmeter 7, a regulating valve, 8, a second parallel pipeline, 9-1, a first gas-liquid separator, 9-2, a second gas-liquid separator, 10-1, a first plate heat exchanger, 10-2, a second plate heat exchanger, 11, a steam generator, 12, a surge tank, 13, a steam regulating valve, 14, a vortex street flowmeter, 15, a third parallel pipeline, 16, a liquid distribution device, 17, a small heat exchanger, 18, a water tank injection port, 19, a water softener system, 20, a condensation tank, 21, a fourth parallel pipeline, 22, a main heat exchanger, 22-1 falling film type sleeve heat exchanger, 22-2 liter film type sleeve heat exchanger, 23, a sight glass, 24, a temperature sensor, 25, a pressure difference transmitter, 26, a multichannel recorder, 27, an electric control cabinet, 28 and a computer.
Detailed Description
The invention relates to a comprehensive test experimental system for an elevating film evaporation/reboiler, which is shown in figure 1, and consists of a cooling medium pipeline unit, a steam pipeline unit, a test heat exchanger unit and a data measurement and control unit, wherein the units are connected through pipelines or corresponding connecting elements.
The inlet of a centrifugal pump 4 in the cooling medium pipeline unit is connected with the outlet of a heating water tank 1 through a threaded ball valve 2 and a Y-shaped filter 3, the outlet of the centrifugal pump 4 is connected with a first parallel pipeline 5, a valve and a turbine flowmeter are arranged on each pipeline of the first parallel pipeline 5, the flow of the first parallel pipeline can be controlled by a regulating valve 7, so that cooling medium flows into the inlet of the side of a main heat exchanger pipe to be tested through a second parallel pipeline 8, and finally flows through a small heat exchanger 17 at the upper part of the heating water tank to return to the heating water tank after heat exchange, so that the cooling medium pipeline unit is formed.
The steam pipeline unit comprises a steam generator 11, a pressure stabilizing tank 12, a steam regulating valve 13, a vortex shedding flowmeter 14, a condensing tank 20, various valves and connecting pipelines. The steam generator 11 in the steam pipeline unit is sequentially connected with the pressure stabilizing tank 12, the steam regulating valve 13 and the vortex shedding flowmeter 14 through pipelines, heated steam is sent to the inlet of the shell side of the main heat exchanger through the third parallel pipeline 15, the steam is condensed into liquid through heat exchange, the liquid flows into the condensing tank 20 through the fourth parallel pipeline 21, and condensate is discharged through the drain valve through the sewer pipeline, so that the steam pipeline unit is formed.
The test heat exchanger unit comprises a main heat exchanger 22, a first gas-liquid separator 9-1, a second gas-liquid separator 9-2, a first plate heat exchanger 10-1, a second plate heat exchanger 10-2 and connecting pipelines, wherein the main heat exchanger consists of a climbing film type double-pipe heat exchanger 22-2 and a falling film type double-pipe heat exchanger 22-1, the gas-liquid separators which correspond to each other through the pipelines are respectively connected with the plate heat exchanger 10 (the No. 22-1 corresponds to a falling film type heat exchange system, the No. 22-2 corresponds to a climbing film type heat exchange system), the heat exchange process of cold and hot media and the gas-liquid separation process of the cold media are completed, and the liquid distribution device 16 is arranged on the special falling film type double-pipe heat exchanger 22-1, so that the cooling media can be uniformly distributed.
The first two three four parallel pipelines complete pipeline switching through the switch of the threaded ball valve 2 to communicate the experimental pipeline required by measurement.
The experimental system uses water, cooling water used by heat exchangers such as a plate heat exchanger and the like, the steam generator uses deionized water treated by the water softener system 19, the connection between the water softener system and each heat exchanger is completed through a hose, and the switch of the water softener system can be controlled by the threaded ball valve 2.
In a preferred embodiment, the main heat exchanger 22 is a double pipe heat exchanger, the double pipe gauge being Φ76X3 mm, the effective length of the heat exchange tubes being 1800mm. The heat exchanger pressing plate compresses the O-shaped ring under the pressure of the flange, and the compressed O-shaped ring generates pressure on the heat exchange tube, so that the sealing between the sleeve and the pressing plate is realized. The main heat exchanger 22 and the liquid distribution device 16 are provided with sight glass 23, which is convenient for observing experimental phenomena.
The tubing and equipment in the experimental system for the working medium contact was made of 304L stainless steel.
As shown in fig. 2, the temperature sensor 24 in fig. 1, the turbine flowmeter 6 (including the first turbine flowmeter 6-1 and the second turbine flowmeter 6-2) and the vortex shedding flowmeter 14 are connected with the multichannel recorder 26 through wiring, and then connected with the computer 28; the differential pressure transmitter 25 is collected by the electric control cabinet 27, and finally all experimental data are output to the computer 28 for display, so that the data can be monitored and recorded in real time when the system is running. The condensate mass is measured by a specially equipped electronic balance, and the condensate after measurement can be injected into a heating water tank through a water tank working medium injection port 18 for continuous cyclic utilization.
The system operation schematic diagram under the condition of lifting film evaporation/reboiler comprehensive test experiment system lifting film is shown in fig. 3, and the arrow indicates the flow direction of various media.
The system operation schematic diagram under the falling film condition of the lifting film evaporation/reboiler comprehensive test experimental system is shown in fig. 4, and the arrow indicates the flow direction of various media.
The basic use flow of the experimental system is as follows: firstly, checking a system pipeline, and selecting a valve in the parallel pipeline 1, which corresponds to the front of the turbine flowmeter, to be in an open state according to the flow of the experimental working condition; according to the requirement of the experimental mode, valves in the parallel pipelines 2, 3 and 4 are adjusted to be in a correct switching state; the valves in front of the experimental devices such as the plate change, the condenser, the softened water system and the like to be used are checked to be in a correct on-off state. Then, a power supply of the cooling medium pipeline unit is started, and the centrifugal pump is started; starting a power supply of the steam pipeline unit, and starting a steam generator; and (3) starting a power supply of the data measurement and control unit, starting a computer, a multichannel recorder and other test instruments, and in the experimental process, monitoring and recording data in real time through the computer, adjusting the reasonable opening of the regulating valve in the cooling medium pipeline and the reasonable opening of the steam regulating valve in the steam pipeline, thereby completing the adjustment of experimental working conditions. After the experiment is finished, the power supply of the steam pipeline unit is firstly turned off, and after the system is cooled down, the power supplies of the cooling medium pipeline unit and the data measurement and control unit are turned off, so that the experiment is finished.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (7)
1. A lifting film evaporator comprehensive test experiment system is characterized in that: the experimental system comprises a cooling medium pipeline unit, a steam pipeline unit, a test heat exchanger unit and a data measurement and control unit, wherein the units are connected through pipelines; alternatively, the units are connected by corresponding connecting elements;
in the cooling medium pipeline unit, an outlet of the heating water tank (1) is connected with an inlet of the centrifugal pump (4), and an outlet of the centrifugal pump (4) is respectively connected with the first turbine flowmeter (6-1) and the second turbine flowmeter (6-2) through a first parallel pipeline (5); the outlets of the first turbine flowmeter (6-1) and the second turbine flowmeter (6-2) are connected with a main heat exchanger through a cooling medium pipeline and a regulating valve (7), and the main heat exchanger is communicated with the heating water tank (1) through a small heat exchanger (17); the cooling medium pipeline is connected with a main heat exchanger pipe side inlet through a second parallel pipeline (8); an adjusting valve (7) is arranged between the first parallel pipeline (5) and the second parallel pipeline (8);
in the steam pipeline unit, a steam generator (11) is sequentially connected with a pressure stabilizing tank (12), a steam regulating valve (13) and a vortex shedding flowmeter (14) through pipelines, the vortex shedding flowmeter (14) is connected with a shell side inlet of a main heat exchanger, and an outlet of the main heat exchanger is connected with a condensing tank (20); the steam pipeline unit is connected with shell side inlets of the climbing film type double-pipe heat exchanger (22-2) and the falling film type double-pipe heat exchanger (22-1) through a third parallel pipeline (15); the connection between the shell side outlet of the main heat exchanger and the condensing tank (20) is completed by a fourth parallel pipeline (21);
in the test heat exchanger unit, the main heat exchanger comprises a climbing film type sleeve heat exchanger (22-2) and a falling film type sleeve heat exchanger (22-1), and is respectively connected with corresponding gas-liquid separators in phase through pipelines, and then is connected with corresponding plate heat exchangers to complete the heat exchange process of cold and hot media and the gas-liquid separation process of the cold media;
the pipe side and the shell side outlet of the main heat exchanger (22) are respectively provided with a differential pressure transmitter and a temperature sensor, and the heat exchange pipe of the main heat exchanger is provided with the temperature sensor and is also provided with a condensate quality measuring device.
2. The lifting film evaporator integrated test experiment system according to claim 1, wherein: the climbing film type double-pipe heat exchanger (22-2) and the falling film type double-pipe heat exchanger (22-1) are respectively connected with a second gas-liquid separator (9-2) and a first gas-liquid separator (9-1) which are in phase correspondence through pipelines, and the second gas-liquid separator (9-2) is connected with the plate type heat exchanger (10) to complete the heat exchange process of cold and hot media and the gas-liquid separation process of the cold media.
3. The lifting film evaporator integrated test experiment system according to claim 1, wherein: the plate heat exchanger (10) and the steam generator (11) are respectively connected with the water softener (19).
4. The lifting film evaporator integrated test experiment system according to claim 1, wherein: the climbing film type double-pipe heat exchanger (22-2) and the falling film type double-pipe heat exchanger (22-1) are respectively provided with an upper sight glass and a lower sight glass (23).
5. The lifting film evaporator integrated test experiment system according to claim 1 or 2, wherein: a liquid distribution device (16) is arranged at the upper end of the falling film type double pipe heat exchanger (22-1).
6. The lifting film evaporator integrated test experiment system according to claim 5, wherein: the liquid distribution device is provided with a sight glass.
7. The lifting film evaporator integrated test experiment system according to claim 1, wherein: the turbine flowmeter (6), the vortex shedding flowmeter (14) and the temperature sensor (24) are connected with a computer (28) system through a multichannel test recorder (26); the data of the differential pressure transmitter (25) is collected by an electric control cabinet (27) and is output to a computer (28) for display.
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| CN113418955A (en) * | 2021-07-15 | 2021-09-21 | 中核坤华能源发展有限公司 | Vertical intraductal falling film evaporative condenser coefficient of heat transfer test system |
| CN115791243B (en) * | 2023-02-06 | 2023-04-28 | 中国核动力研究设计院 | Standardized experimental platform, method, equipment and medium for modular microchannel heat exchanger |
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| CN109855900A (en) | 2019-06-07 |
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