CN1124841A - Separated phase transition heat apparatus and technique for recovering low-temp. waste heat using azeotrope as medium - Google Patents
Separated phase transition heat apparatus and technique for recovering low-temp. waste heat using azeotrope as medium Download PDFInfo
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- CN1124841A CN1124841A CN 94114031 CN94114031A CN1124841A CN 1124841 A CN1124841 A CN 1124841A CN 94114031 CN94114031 CN 94114031 CN 94114031 A CN94114031 A CN 94114031A CN 1124841 A CN1124841 A CN 1124841A
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- azeotrope
- evaporator section
- low temperature
- condensation segment
- retracting device
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Abstract
The low-temp. (less than 150 deg.C) afterheat recovering apparatus with phase-change heat exchange is composed of evaporating section, condensing section, connecting channel and circulating working medium, and features use of azeotrope as working medium. Its advantages include operation at ordinary pressure or low vacuum, low sealing requirement, and high heat-exchange efficiency.
Description
The invention belongs to low temperature exhaust heat and reclaim, specifically a kind of is the separated phase transition heat exchange low temperature exhaust heat retracting device and the technology of cycle fluid with the azeotrope.
In production processes such as power, petrochemical industry, organic synthesis, often there is the fluid (product or intermediate products) below 150 ℃ need be cooled to the temperature of technological requirement or forward subsequent processing to continue processing.Though their temperature potential is not high, flow is very big, so thermal capacity is not little.In order to reclaim this low temperature exhaust heat, the scientific worker has made extensive work both at home and abroad.Low temperature exhaust heat retracting device and technology such as the generating of low boiling organic working medium, absorption refrigeration, heat pump, heat pipe, heating agent heat exchange have successively been developed.But the investment that they have is excessive, and the heat exchange efficiency that has is not high.Utilize the phase transition of vacuum heat transfer technology (Chinese patent 89207329.2) of gravity assisted heat pipe principle exploitation though had industrial utilization, yet, owing to need turn round under up to 0.0965 MPa condition in vacuum, so very high to the material and the processing request of equipment.The organic working medium generating of developing on the document, generally selecting the single organic matter of low boiling for use is working medium, is circulated for making this organic working medium, must be equipped with the low-temperature receiver that is lower than this organic matter boiling point.
Purpose of the present invention aims to provide a kind of easy to manufacture, low temperature exhaust heat retracting device and technology that the choice is big.
The present invention is achieved in that adopting the azeotrope with lower azeotropic point is cycle fluid in the waste-heat recovery device with evaporator section (being located at the bottom), condensation segment (being located at top) and bonded channel (being located at the middle part).The hot fluid of waste heat to be recycled makes the liquid azeotrope vaporization in the evaporator section, enters condensation segment and is condensed into liquid state by cold fluid through linkage path, relies on gravity to flow back to automatically in the evaporator section along the inwall of linkage path again, realizes the operation cycle of working medium with this.Heated cold fluid can directly be sent to the user, thereby has realized the recovery of waste heat.
The azeotropic phenomenon is the distinctive character of some liquid, and they have the binary azeotrope, ternary azeotrope and polynary azeotrope.For the azeotropic of a certain appointment, it is certain that its constant boiling point and azeotrope are formed.They all are in a liquid state below constant boiling point, and are immiscible or slightly soluble at the most.Azeotropic temperature with azeotrope of lower azeotropic point is lower than the pure material boiling point of forming this azeotrope, for example the constant boiling point of binary azeotrope propane diols one ethanol is 63.5 ℃, it consists of propane diols: ethanol=81: 19, and the boiling point 1 of pure material, 2 propane diols are 188.2 ℃, 1,3 propane diols is 214 ℃, and ethanol is 78.4 ℃.
The azeotrope that employing has a lower azeotropic point is that cycle fluid can make and originally can not realize that under normal pressure the diabatic process of phase-change heat-exchange becomes the phase-change heat-exchange process, to improve its heat transfer coefficient.Also can under reduced pressure operate, further reduce constant boiling point, to reclaim the more waste heat of low temperature.
The present invention has following characteristics:
1, azeotropic working medium all is phase-change heat-exchange at evaporator section and condensation segment, since concerning same fluid phase-change heat-exchange than the surface film thermal conductance of no phase-change heat-exchange greatly tens of times closely to hundred times, particularly form by immiscible simple substance owing to azeotrope, in phase transition process, can not form film boiling or film condensation, make heat transfer coefficient bigger like this.
2, needing no vacuum is greatly simplified processing and manufacturing.
3, the azeotrope kind is a lot, and the same its constant boiling point with pure simple substance also improves with the vacuum of system and reduce, so the operating temperature choice is very big.
4, rely on gravity to realize that the automatic circulation of working medium need not power, so compact conformation.
5, use the azeotrope that constant boiling point reduces gradually or change operating pressures at different levels and can realize that classification reclaims heat, to satisfy different technological requirements.
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is a system schematic.
Evaporator section (1) is in the bottom, and condensation segment (2) links with linkage path (3) in the middle of it on top.The structure of evaporator section (1) and condensation segment (2) has multiple pattern, but they all are recuperative heat exchangers, recommends to adopt high efficient heat exchanging element DAE or DAC.Cycle fluid (4) is housed in evaporator section (1).The fluid of waste heat to be recycled is with higher temperature T
1By evaporator section import (6) behind tube side with T
2(T
1＞T
2) discharge by evaporator section outlet (7), fluid to be heated is entered by condensation segment import (9) with temperature t 1 behind the tube side of condensation segment with temperature t
2(t
2＞t
1) be sent to the user from condensation segment outlet (8).Be provided with check (non-return) valve (5) on the top of condensation segment (2).When system was atmospheric operation, check (non-return) valve (5) outlet and atmosphere passed to not condensing in the exhaust system mutually (working medium (4) temperature are the constant boiling point T of this azeotrope in this moment system
H); When system is in negative-pressure operation, check (non-return) valve (5) outlet and vacuum system link (the working medium temperature is lower than the constant boiling point of this azeotrope in the system at this moment, and its numerical value depends on the vacuum of system).
For guaranteeing that vapour one liquid is taken their own roads in linkage path (3), Fig. 2 has provided the partial enlarged drawing of linkage path (3).Linkage path (3) upper end is stretched into the shell of condensation segment (2) and certain height h is arranged, in linkage path (3) near condensation segment (2) inwall place along the some apertures of Zhou Kaiyou (10).In linkage path (3), survey and be provided with skirt and enclose (11), it is zigzag that skirt encloses (11) lower end, crown is close to linkage path (3) inwall, like this, rising steam is risen by linkage path (3) mid portion, encloses (11) at the liquid refrigerant (4) of condensation segment (2) via aperture (10) and skirt and flows in the evaporator section (1) along the inwall of linkage path (3) and amass.
Drop for the steam that prevents to rise is carried under one's arms and refluxed under some specific condition (too big as the vapour phase flow velocity), also can be provided with liquid-bearing pan (12) and catheter (13), withdrawing fluid directly is sent under the liquid level of evaporator section (1).
For satisfying the requirement of different user, Fig. 3 has provided branch (temperature) level recovery system figure (having provided three grades among the figure).The fluid of waste heat to be recycled is with temperature T
1Enter the evaporator section of the first order of heat recovery system, through partial evaporator section at last with temperature T
4Leave evaporator section (the obvious T of the third level
1＞T
2).Heated fluid is with temperature t
1, t
3, t
5Enter condensation segment (t at different levels respectively
1, t
3, t
5Numerical value can be identical, also can be different) after be heated, and respectively with temperature t
2, t
4, t
6Be sent to the user.(ordinary circumstance t
6＞t
4＞t
2).As for the evaporative condenser temperature T in each section
H1, T
H2, T
H3Be different, and exist T
H1＞T
H2＞T
H3Relation, its numerical value is to select according to qualifications according to overall balance in the design, as soon as can adopt (1) to select the azeotrope kind after determining; (2) select the interior operating pressure of evaporation one condenser, can in very wide scope, adjust the evaporative condenser temperature.
This separate type phase-change heat-exchange low temperature exhaust heat retracting device can be operated under normal pressure or not high vacuum, and equipment is made easily, and is not high to seal request, facility compact, and floor space is little, the heat exchange efficiency height.Changing azeotrope kind and vacuum can reclaim low temperature (＜150 ℃) in very wide scope waste heat, is a kind of desirable low temperature exhaust heat retracting device.
Claims (6)
1, a kind of is the separated phase transition heat exchange low temperature exhaust heat retracting device and the technology of working medium with the azeotrope, form by evaporator section (1), condensation segment (2), linkage path (3) and cycle fluid (4) etc., it is characterized in that cycle fluid (4) is for having the azeotrope of lower azeotropic point, cycle fluid (4) is in the evaporator section heat absorption vaporization of bottom, rise to top condensation segment (2) heat release condensation, the liquid refrigerant of condensation (4) relies on gravity to be back to evaporator section (1) automatically, has realized the operation cycle of cycle fluid (4).
2, a kind of separate type low temperature exhaust heat retracting device as claimed in claim 1 and technology is characterized in that being provided with check (non-return) valve (5) on the top of condensation segment (2), in order to get rid of the not condensing in evaporator section (1) and the condensation segment (2) and to prevent that air from flowing backwards.
3, a kind ofly it is characterized in that as claim 1 and 2 described separate type low temperature exhaust heat retracting device and check (non-return) valves the outlet of check (non-return) valve (5) can vacuumize, evaporator section (1) is operated under different vacuum with the shell side of condensation segment (2).
4, a kind of as claim 1 and 2 described separate type low temperature exhaust heat retracting device and check (non-return) valves, it is characterized in that linkage path (3) upper end stretches in the condensation segment (2) and certain height is arranged, have some apertures (10) on linkage path (3) wall, the skirt that linkage path (3) inwall is provided with the lower end indentation encloses (11), can flow to the evaporator section (1) of bottom along linkage path (3) inwall with the liquid azeotrope working medium of backflow (4) that guarantees to be flowed down by aperture (10).
5, a kind of separate type low temperature exhaust heat retracting device as claimed in claim 1 and technology, it is characterized in that being provided with liquid-bearing pan (12) and catheter (13) in the lower end of linkage path (3), along wall and under liquid azeotrope working medium (4) in liquid-bearing pan (12), concentrate the back to lead in the liquid level of evaporator section (1) by catheter (13).
6, a kind of separate type low temperature exhaust heat retracting device as claimed in claim 1 and technology is characterized in that it both can the one-level recovery waste heat, can also the classification recovery waste heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94114031 CN1124841A (en) | 1994-12-14 | 1994-12-14 | Separated phase transition heat apparatus and technique for recovering low-temp. waste heat using azeotrope as medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94114031 CN1124841A (en) | 1994-12-14 | 1994-12-14 | Separated phase transition heat apparatus and technique for recovering low-temp. waste heat using azeotrope as medium |
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| Publication Number | Publication Date |
|---|---|
| CN1124841A true CN1124841A (en) | 1996-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94114031 Pending CN1124841A (en) | 1994-12-14 | 1994-12-14 | Separated phase transition heat apparatus and technique for recovering low-temp. waste heat using azeotrope as medium |
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| Country | Link |
|---|---|
| CN (1) | CN1124841A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288051A (en) * | 2011-06-16 | 2011-12-21 | 徐志刚 | Vertical double-tube plate shell-and-tube heat exchanger for evaporating liquid with minimum constant boiling component |
| CN103122571A (en) * | 2010-05-13 | 2013-05-29 | 李宏江 | Three-combination double-recovery energy-saving industrial clothes dryer |
| CN104006580A (en) * | 2014-05-21 | 2014-08-27 | 天津商业大学 | Falling-film evaporation device |
| CN104154786A (en) * | 2014-08-20 | 2014-11-19 | 湖北迪峰换热器股份有限公司 | Three-medium efficient LNG vaporizer strengthening evaporation and condensation |
| CN106017168A (en) * | 2016-07-11 | 2016-10-12 | 江苏科技大学 | LNG vaporizer utilizing phase-change heat transfer technology and vaporization method |
-
1994
- 1994-12-14 CN CN 94114031 patent/CN1124841A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122571A (en) * | 2010-05-13 | 2013-05-29 | 李宏江 | Three-combination double-recovery energy-saving industrial clothes dryer |
| CN102288051A (en) * | 2011-06-16 | 2011-12-21 | 徐志刚 | Vertical double-tube plate shell-and-tube heat exchanger for evaporating liquid with minimum constant boiling component |
| CN102288051B (en) * | 2011-06-16 | 2012-12-19 | 徐志刚 | Vertical double-tube plate shell-and-tube heat exchanger for evaporating liquid with minimum constant boiling component |
| CN104006580A (en) * | 2014-05-21 | 2014-08-27 | 天津商业大学 | Falling-film evaporation device |
| CN104154786A (en) * | 2014-08-20 | 2014-11-19 | 湖北迪峰换热器股份有限公司 | Three-medium efficient LNG vaporizer strengthening evaporation and condensation |
| CN106017168A (en) * | 2016-07-11 | 2016-10-12 | 江苏科技大学 | LNG vaporizer utilizing phase-change heat transfer technology and vaporization method |
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