CN101576518B - Experimental device for evaporation, absorption and mass transferring of falling film of vertical tube - Google Patents
Experimental device for evaporation, absorption and mass transferring of falling film of vertical tube Download PDFInfo
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- CN101576518B CN101576518B CN2009100403302A CN200910040330A CN101576518B CN 101576518 B CN101576518 B CN 101576518B CN 2009100403302 A CN2009100403302 A CN 2009100403302A CN 200910040330 A CN200910040330 A CN 200910040330A CN 101576518 B CN101576518 B CN 101576518B
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Abstract
The invention discloses an experimental device for the evaporation, absorption and heat and mass transferring of a falling film of a vertical tube, which comprises a closed and communicated circulating system consisting of basic parts of a generator, an absorber, a pressure reducing valve, a heat exchanger, a heating device and a cooling device; the circulating system is provided with a temperature measuring system, a pressure measuring system and a flow measuring system respectively so as to realize the tracking and monitoring on the condition of the temperature, the pressure and flow variation of a research working medium in the circulating system. The device has the advantages that: the closed and communicated circulating system consisting of the vertical tube generator, the vertical tube absorber, a connecting pipeline of the research working medium and the like is provided with sight glass for conveniently observing a film forming flow state; the measuring system can realize the tracking and monitoring on the condition of the temperature, the pressure and flow variation of the research working medium in the circulating system, can carry out the thermal property research and the heat and mass transferring experiment research of a plurality of working media and has compact structure, convenient operation, visualization, intuition and reliable safety performance.
Description
Technical field
The present invention relates to the heat and mass experimental provision of a kind of teaching, scientific research use, especially relate to the experimental provision of vertical tube falling film evaporation and absorption.
Background technology
Falling film evaporation is one of content of courses important in the professional undergraduate courses such as Chemical Engineering and Technology, metallurgical engineering, Thermal Power Engineering, applied chemistry, environmental engineering, food engineering, it also is one of unit operations common in chemical industry, the food production, it has characteristics such as low discharge, the little temperature difference, the high coefficient of heat transfer and high heat flux, thereby obtains widespread use at aspects such as the energy, chemical industry, refrigeration, middle low-temperature electricity-generating and desalinizations.But present experimental provision research has following weak point: just study single evaporation or absorption experiment device, evaporation and absorption can not be combined simultaneously and study; Only single working medium, horizontal tube falling liquid film have been carried out experimental study, and the vertical tube film droping heat-transfer mass transfer experiment research of various cold-producing mediums and mixed working fluid almost has been in the blank stage; Can not carry out tracking monitor to research working medium solution and temperature, the pressure change situation of steam in the circulation system.
Summary of the invention
The purpose of this invention is to provide a kind of vertical tube falling film evaporation and absorb the heat and mass experimental provision, its compact conformation, easy to operate, visual in image, security performance is reliable, can carry out the study on thermal property and the heat and mass experimental study of the single working medium of multiple refrigeration, mixture working medium, in the circulation system, be respectively arranged with temperature, pressure and Flow Measuring System, to realize that the situation of change of research working medium temperature, pressure and flow in the circulation system is carried out tracking monitor.
Technical solution of the present invention is: a kind of vertical tube falling film evaporation and absorption heat and mass experimental provision, comprise the vertical tube generator, the vertical tube absorber, fluid reservoir, heat interchanger, solution pump, heating water tank, heat-exchanger pump, cooling tower, cooling-water pump is formed, the solution pump inlet is communicated with described fluid reservoir bottom by pipeline, outlet is communicated with first inlet of heat interchanger by pipeline, first outlet of heat interchanger is communicated with the working medium inlet of vertical tube generator by pipeline, the working medium gaseous phase outlet of vertical tube generator is through being communicated with the working medium gas phase inlet of fluid reservoir and vertical tube absorber respectively by pipeline behind the reduction valve, the working medium liquid phase outlet of vertical tube generator is communicated with second inlet of heat interchanger by pipeline, second outlet of heat interchanger is through being communicated with the working medium liquid phase inlet of vertical tube absorber by pipeline behind the reduction valve, the inlet of heat-exchanger pump is communicated with the heating water tank bottom by pipeline, outlet is communicated with the hot water inlet of vertical tube generator by pipeline, the hot water outlet of vertical tube generator is communicated with heating water tank by pipeline, and the sender property outlet of vertical tube absorber is communicated with fluid reservoir; The inlet of cooling-water pump is communicated with cooling tower by pipeline, outlet is communicated with the cold water inlet of vertical tube absorber by pipeline, the cooling water outlet of vertical tube absorber is communicated with cooling tower by pipeline, behind vertical tube generator, vertical tube absorber, hot water and cold water import and export and reduction valve, be respectively equipped with temperature sensor, be respectively equipped with pressure transducer in vertical tube generator, vertical tube absorber and solution pump exit, be provided with flow sensor respectively at the working medium gaseous phase outlet place of solution pump outlet, heat-exchanger pump outlet, cooling-water pump outlet and vertical tube generator.
In the generation-absorption circulation system, be filled with research working medium solution, working medium solution is sent into the working medium inlet of vertical tube generator behind solution pump and heat interchanger, (or interior) forms uniform liquid film outside the falling film evaporation pipe, in managing behind the hot water heating evaporation of (or outside) in sleeve pipe (outside) form steam, steam is sent in the gas phase inlet and fluid reservoir of vertical tube absorber by pipeline, and the working medium solution after the evaporation is admitted to the liquid phase inlet of vertical tube absorber behind heat interchanger, in the falling film absorption pipe (or outside) form the steam of even liquid film absorption from the vertical tube generator, absorb liberated heat and take away by cooling water system.The closed cycle system that hot-water heating system is made up of heating water tank, heat-exchanger pump, hot water be (or outside) circulation and outer (or interior) falling liquid film solution formation of pipe reverse flow in the falling liquid film pipe.The closed cycle system that cooling water system is made up of cooling-water pump, cooling tower, chilled water be (or outside) falling liquid film solution formation reverse flow in (or interior) circulation and the pipe outside the falling liquid film pipe.Working medium solution forms the circulation of a sealing between vertical tube generator and vertical tube absorber, use this device not only can study the falling film evaporation thermodynamic properties of working medium, the absorption thermodynamic properties of research working medium solution is adapted at the study on thermal property under the various cold-producing medium high pressure accordingly.In the circulation system, be respectively arranged with temperature, pressure and Flow Measuring System, to realize that the situation of change of research working medium temperature, pressure and flow in the circulation system is carried out tracking monitor.
Described vertical tube generator is a falling film evaporator in extratubal falling film evaporator or the pipe, and described vertical tube absorber is a falling-film absorber in extratubal falling film absorber or the pipe, can study working medium according to difference and select suitable falling film evaporation and absorption pattern for use.
On described vertical tube generator, be provided with visor, be convenient to observe the liquid film fluidised form in the generator.
Pipeline that contacts with working medium and equipment use the 0Cr18Ni9 stainless steel to make, and can improve antiseptic power, use various alkaline matters.
Described temperature sensor is connected with computer system by the multiple channel test registering instrument, described pressure transducer is connected with computer system by the hyperchannel recording instrument without paper with flow sensor, described temperature sensor is connected with computer system by the multiple channel test registering instrument, described pressure transducer is connected with computer system by the hyperchannel recording instrument without paper with flow sensor, two registering instruments can each road sensor of observational record test value, and save the data in the internal memory, be connected the error that prevents that manual record from bringing with the general calculation machine, increase work efficiency, this system can be to research working medium temperature in the circulation system, the situation of change of pressure and flow is carried out tracking monitor, simple to operate.
Be respectively equipped with pressure difference transmitter in described vertical tube generator, vertical tube absorber and solution pump exit, be convenient to the pressure change of on-the-spot Direct observation working medium solution in the circulation system.
Advantage of the present invention is: the connecting tube by vertical tube generator, vertical tube absorber, research working medium etc. is formed the circulation system of an airtight connection, visor is housed so that observe the film forming fluidised form, measuring system can realize the situation of change of research working medium temperature, pressure and flow in the circulation system is carried out tracking monitor, can carry out the study on thermal property and the heat and mass experimental study of multiple working medium, compact conformation, easy to operate, visual in image, security performance is reliable.
Description of drawings
Accompanying drawing 1 is the vertical tube falling film evaporation and absorption heat and mass experimental provision synoptic diagram of the embodiment of the invention;
Accompanying drawing 2 is temperature in the embodiment of the invention, pressure, Flow Measuring System synoptic diagram;
1, the vertical tube generator, 2, the vertical tube absorber, 3, fluid reservoir, 4, heat interchanger, 5, heating water tank, 6, cooling tower, 7, visor, 8, solution pump, 9, electromagnetic flowmeter, 10, snail street flowmeter, 11, variable valve, 12, variable valve, 13, reduction valve, 14, reduction valve, 15, pressure difference transmitter, 16, pressure difference transmitter, 17, pressure difference transmitter, 18, temperature sensor probe, 19, temperature sensor probe, 20, temperature sensor probe, 21, temperature sensor probe, 22, temperature sensor probe, 23, gate valve, 24, gate valve, 25, heat-exchanger pump, 26, the hot water flow meter, 27, temperature sensor probe, 28, temperature sensor probe, 29, cooling-water pump, 30, the cooling water flow meter, 31, temperature sensor probe, 32, temperature sensor probe, 33, temperature sensor is drawn termination, 34, the multiple channel test registering instrument, 35, pressure, flow sensor is drawn termination, and 36, hyperchannel recording instrument without paper 37, computing machine.
Embodiment
Embodiment:
Consult Fig. 1, a kind of vertical tube falling film evaporation and absorption heat and mass experimental provision, comprise vertical tube generator 1, vertical tube absorber 2, fluid reservoir 3, heat interchanger 4, reduction valve 13 and reduction valve 14, solution pump 8, heating water tank 5, heat-exchanger pump 25, cooling tower 6, cooling-water pump 29 is formed, solution pump 8 inlets are communicated with the bottom of fluid reservoir 3 by pipeline, outlet is communicated with first inlet of heat interchanger 4 by pipeline, first outlet of heat interchanger 4 is communicated with the working medium inlet of vertical tube generator 1 by pipeline, the working medium gaseous phase outlet of vertical tube generator 1 is communicated with the working medium gas phase inlet of fluid reservoir 3 and vertical tube absorber 2 respectively by pipeline through reduction valve 14 backs, the working medium liquid phase outlet of vertical tube generator 2 is communicated with second inlet of heat interchanger 4 by pipeline, second outlet of heat interchanger 4 is communicated with the working medium liquid phase inlet of vertical tube absorber 2 by pipeline through reduction valve 13 backs, the inlet of heat-exchanger pump 25 is communicated with the bottom of heating water tank 5 by pipeline, outlet is communicated with the hot water inlet of vertical tube generator 2 by pipeline, the hot water outlet of vertical tube generator 2 is communicated with heating water tank 5 by pipeline, and the sender property outlet of vertical tube absorber 2 is communicated with fluid reservoir 3; The inlet of cooling-water pump 29 is communicated with cooling tower 6 by pipeline, and outlet is by the cold water inlet of pipeline connection vertical tube absorber 2, and the cooling water outlet of vertical tube absorber 2 is communicated with cooling tower 6 by pipeline.
The solution circulation is by vertical tube generator 1, vertical tube absorber 2, fluid reservoir 3, heat interchanger 4, solution pump 8, electromagnetic flowmeter 9, vortex shedding flow meter 10, variable valve 11,12, reduction valve 13,14, gate valve 23,24 several basic elements of character are formed the circulation system of an airtight connection, electromagnetic flowmeter 9 is used to measure the mass rate of solution, vortex shedding flow meter 10 is used for the volumetric flow rate of measurement gas, variable valve 11,12 are used to regulate the mass rate of the solution that enters vertical tube generator 1, reduction valve 13,14 are respectively applied for the decompression that vertical tube generator 1 goes out to flow solution and jet chimney, gate valve 23,24 are mainly used in the keying of steam and solution line.Visor 7 is installed on the sleeve pipe of vertical tube generator 1, is used to observe the film forming situation of solution outside vertical tube generator 1; After pressure difference transmitter 15,16,17 is installed in the interior falling liquid film pipe, solution pump 8 outlets of outer tube, the vertical tube absorber 2 of vertical tube generator 1 respectively, in order to measure the pressure in systemic circulation of working medium; Temperature sensor probe 18,19,20,21,22 is installed in vertical tube generator 1, vertical tube absorber 2, hot water and cooling water outlet and inlet and steam respectively and reduces pressure behind 14 valves, in order to measure the temperature in systemic circulation of working medium.Hot water circulation is to connect into the airtight circulation system by heating water tank 5, heat-exchanger pump 25, hot water flow meter 26 several basic elements of character with pipeline, and hot water circulation and solution falling liquid film carry out heat interchange by reverse flow. Temperature sensor probe 27,28 is used to measure the out temperature of hot water.The chilled water circulation is formed the circulation system by cooling tower 6, cooling-water pump 29, cooling water flow meter 30 several basic elements of character, and chilled water circulation and solution falling liquid film carry out heat interchange by reverse flow. Temperature sensor probe 31,32 is used to measure the out temperature of chilled water.
As shown in Figure 2, the lead-in wire of the temperature sensor probe among Fig. 1 18,19,20,21,22,27,28,31,32 is drawn termination 33 by temperature sensor to be connected with multiple channel test registering instrument 34, increase work efficiency in order to reduce sum of errors, multiple channel test registering instrument 34 is connected computing machine 37 connect, constitute temperature measurement system at last.The lead-in wire of pressure difference transmitter 15,16,17 and flowmeter 9,10,26,30 is drawn termination 35 by pressure, flow sensor and is connected with hyperchannel recording instrument without paper 36, is connected with computing machine 37 at last, constitutes pressure, Flow Measuring System.
The hole that temperature sensor probe places pipeline to reserve, drawing termination 33 by temperature sensor directly links to each other with testing recorder 34, temperature sensor is drawn on termination 33 and the testing recorder 34 all the interface that designs, just directly connect and to use, testing recorder 34 can show observed temperature, but because internal memory is little, keep the data in the short time only and do not have the deal with data function, therefore testing recorder 34 is connected with computing machine 37, computing machine 37 has the long-time data of storage and deal with data function, remedies the deficiency of testing recorder 34.
The difference of multiple channel test registering instrument 34 and hyperchannel recording instrument without paper 36 is: multiple channel test registering instrument 34 is only effective at probe temperature, can not test pressure and flow, and hyperchannel recording instrument without paper 36 is just effective at pressure and flow, can not probe temperature; Adopt above-mentioned two kinds of registering instruments in the present embodiment respectively, its cost is low, is the scale product all, obtains easily, and is easy to maintenance.
Used Online Transaction Processing in the present embodiment, can further improve the whole experiment device system, a kind of incorporate experimental provision is provided, when moving, can monitor in real time and record data, prevented human error, improved the accuracy of experiment in system.
Referring to Fig. 1, during work, working medium solution passes through solution pump 8 pressurizations and variable valve 11 adjusting vertical tube generators 1 working medium inlet liquid inventory from fluid reservoir 3 after, enter the solution heat exchange after heat interchanger 4 and vertical tube generator 1 evaporate, send into the film-distributing device of vertical tube generator 1 then, outside the falling film evaporation pipe, form uniform liquid film, hot water in liquid film and the pipe forms reverse flow, liquid film evaporates in sleeve pipe after absorbing heat, steam is through reduction valve 14 decompressions, by vortex shedding flow meter 10 and temperature sensor probe 22, after the measurement data, be admitted in the film-distributing device and fluid reservoir 3 of vertical tube absorber 2, and the solution that process heat interchanger 4 of the solution after the evaporation and solution pump 8 are sent here carries out heat interchange, by being admitted to the film-distributing device of vertical tube absorber 1 behind reduction valve 13 decompressions and the variable valve 12 adjusting vertical tube absorbers 1 liquid phase inlet flow rate, in the falling film absorption pipe, form the steam of even liquid film absorption from vertical tube generator 1, liquid film and the outer chilled water of pipe form reverse flow, absorb liberated heat and take away, thereby solution forms a system of sealing continuously by chilled water.Simultaneously, hot-water heating system is formed a continuous closed cycle system by heating water tank 5, heat-exchanger pump 25, hot water flow meter 26; Cooling water system is by cooling-water pump 29, and cooling water flow meter 30, cooling tower 6 are formed a continuous circulation system.
In the present embodiment, vertical tube generator 1 pipe range is about 5 meters, carries out the extratubal falling film evaporation, also can use falling film evaporation mode in the pipe.About 6 meters of vertical tube absorber 2 pipe ranges for managing interior falling film absorption, also can use the extratubal falling film absorber.
1, the vertical tube falling film evaporation with absorb the heat and mass circulation system to the metering system of temperature everywhere:
Referring to Fig. 1, Fig. 2, because the temperature difference of solution, hot water, chilled water various piece in the circulation system, the temperature of popping one's head in the circulation system is also different, the lead-in wire of the temperature sensor probe 18,19,20,21,22,27,28,31,32 by everywhere and the temperature sensor among Fig. 2 are drawn termination 33 and are connected to multiple channel test registering instrument 34 and show observed temperatures, are connected to computing machine 37 and preserve and deal with data.
2, the vertical tube falling film evaporation with absorb the heat and mass circulation system to the metering system of flow and pressure everywhere:
Referring to Fig. 1, Fig. 2, because pressure, flow and hot water, the cooling water flow difference of solution various piece in the circulation system, can directly reflect the variation of solution working medium pressure in the circulation system by pressure difference transmitter 15,16,17, can directly reflect the variation of various working medium flow in the circulation system by flowmeter 9,10,26,30, also can draw termination 35 and be connected demonstration observed pressure, flow with hyperchannel recording instrument without paper 36, be connected to computing machine 37 and preserve and deal with data by pressure, flow sensor.
3, the observation of liquid film fluidised form in the generator
Referring to Fig. 1,, when system moves, can observe the fluidised form of liquid film by visor owing on the sleeve pipe of generator visor 7 is installed.
Above-listed detailed description is at the specifying of one of the present invention possible embodiments, and this embodiment is not in order to limiting claim of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the claim of this case.
Claims (3)
- A vertical tube falling film evaporation with absorb the heat and mass experimental provision, comprise the vertical tube generator, the vertical tube absorber, fluid reservoir, heat interchanger, solution pump, first reduction valve, second reduction valve, heating water tank, heat-exchanger pump, cooling tower, cooling-water pump, it is characterized in that: described solution pump inlet is communicated with described fluid reservoir bottom by pipeline, outlet is communicated with first inlet of described heat interchanger by pipeline, first outlet of described heat interchanger is communicated with the working medium inlet of described vertical tube generator by pipeline, the working medium gaseous phase outlet of described vertical tube generator is communicated with the working medium gas phase inlet of described fluid reservoir and described vertical tube absorber respectively by pipeline after through second reduction valve, the working medium liquid phase outlet of described vertical tube generator is communicated with second inlet of described heat interchanger by pipeline, second outlet of described heat interchanger is through being communicated with the working medium liquid phase inlet of described vertical tube absorber by pipeline behind first reduction valve, the inlet of described heat-exchanger pump is communicated with described heating water tank bottom by pipeline, outlet is communicated with the hot water inlet of described vertical tube generator by pipeline, the hot water outlet of described vertical tube generator is communicated with described heating water tank by pipeline, and the sender property outlet of described vertical tube absorber is communicated with described fluid reservoir; The inlet of described cooling-water pump is communicated with described cooling tower by pipeline, outlet is communicated with the cold water inlet of described vertical tube absorber by pipeline, the cooling water outlet of described vertical tube absorber is communicated with described cooling tower by pipeline, at described vertical tube generator, the vertical tube absorber, hot water and cold water are imported and exported and first reduction valve, be respectively equipped with temperature sensor on the pipeline behind second reduction valve, outer tube at described vertical tube generator, the interior falling liquid film pipe and the solution pump exit of vertical tube absorber are respectively equipped with pressure transducer, in described solution pump outlet, the heat-exchanger pump outlet, the working medium gaseous phase outlet place of cooling-water pump outlet and described vertical tube generator is provided with flow sensor respectively, described temperature sensor is connected with computer system by the multiple channel test registering instrument, and described pressure transducer is connected with computer system by the hyperchannel recording instrument without paper with flow sensor.
- 2. a kind of vertical tube falling film evaporation according to claim 1 and absorption heat and mass experimental provision is characterized in that: be provided with visor on described vertical tube generator.
- 3. a kind of vertical tube falling film evaporation according to claim 2 and absorption heat and mass experimental provision, it is characterized in that: described pressure transducer is a pressure difference transmitter.
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| CN2009100403302A CN101576518B (en) | 2009-06-17 | 2009-06-17 | Experimental device for evaporation, absorption and mass transferring of falling film of vertical tube |
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| CN2009100403302A CN101576518B (en) | 2009-06-17 | 2009-06-17 | Experimental device for evaporation, absorption and mass transferring of falling film of vertical tube |
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| CN101576518A CN101576518A (en) | 2009-11-11 |
| CN101576518B true CN101576518B (en) | 2011-06-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103439356A (en) * | 2013-06-05 | 2013-12-11 | 中国石油大学(华东) | Experimental apparatus and method for constant-pressure specific heat measurement of supercritical carbon dioxide |
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| CN103616316B (en) * | 2013-12-09 | 2015-11-11 | 吉林大学 | The vertical falling liquid film flow of micro-structure surface and evaporation and heat-exchange performance testing device |
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| CN107271478B (en) * | 2017-06-13 | 2019-10-01 | 华北水利水电大学 | A kind of vertical pipe Heat Transfer in Evaporating Falling Film pilot system and its test method |
| CN107192571B (en) * | 2017-06-15 | 2019-01-29 | 西安交通大学 | Horizontal tube bundle and the outer refrigeration working medium falling film evaporation of single tube, pool boiling and condensation phase change heat exchange test device |
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2009
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439356A (en) * | 2013-06-05 | 2013-12-11 | 中国石油大学(华东) | Experimental apparatus and method for constant-pressure specific heat measurement of supercritical carbon dioxide |
| CN103439356B (en) * | 2013-06-05 | 2016-08-10 | 中国石油大学(华东) | The experimental provision measured for supercritical carbon dioxide specific heat at constant pressure and method |
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