CN87200656U - Spray falling-film evapouator with horizontal porous surface tube - Google Patents
Spray falling-film evapouator with horizontal porous surface tube Download PDFInfo
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- CN87200656U CN87200656U CN 87200656 CN87200656U CN87200656U CN 87200656 U CN87200656 U CN 87200656U CN 87200656 CN87200656 CN 87200656 CN 87200656 U CN87200656 U CN 87200656U CN 87200656 U CN87200656 U CN 87200656U
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- heat transfer
- pipe
- tube
- porous surface
- porous
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Abstract
The utility model belongs to the method and apparatus of heat transfer capability of an increasing evaporator (in particular to a tube bundle evaporator), which is characterized in that the outer surface of a horizontal pipe is the porous surface of electrochemical corrosion, the inner surface is the surface of electrochemical polishing or smooth surface, the inner surface of the horizontal pipe is the surface of the electrochemical polishing, and the outside of the horizontal pipe is the smooth surface or the porous surface processed with the method of winding junction or spray finishing. The spray falling-film evaporator with the horizontal pipe treated intensively has the advantages of improved total heat transfer coefficient, decreased heat transfer area and low cost.
Description
The invention relates to the equipment that increases evaporimeter (especially restraining evaporimeter) heat-transfer capability.
In chemical industry, medical industry, food industry, metallurgical industry, refrigerating industry, forest product industry, desalinization field, but all equal usage level pipe fountain falling film evaporators of process that relates to solution concentration.Horizontal tube fountain falling film evaporator is that U.S. Aqua-Chem company developed the sixties, at first makes fresh water with seawater and studies.It has, and heat transfer coefficient height, solution are evenly distributed, fouling distributes to solution does not influence the effective temperature difference advantages of higher.The about 3000W/m of overall heat-transfer coefficient of the stainless steel tube bank that in experiment and medium-sized factory, is obtained
2K.
Yet, in horizontal tube fountain falling film evaporator, when with water vapour in the in-tube condensation heat release during as thermal source evaporation water solution, the heat transfer coefficient of the outer evaporation side of pipe often has only 50～70% of condensation side heat transfer coefficient.Main thermal resistance evaporation side outside pipe.Therefore, in order to finish certain production task, the heat transfer area of evaporimeter is bigger, the cost height.
For the heat transfer coefficient of the outer evaporation side of enhanced tube, forefathers once did a large amount of work.As adopt spraying process to manage outer to spray into the porous rough surface, use outside connection will manage around form the rough porous surface (Lin Li with, Zhejiang university, " hardening constituent exchanged heat Progress in technique "; M.-C.Chyu, et al., Advances in Enhanced Heat Transfer, ASME, PP.66-71,1981; Ibid, PP.275-280, " Enhancement of Horizontal Tube Spray Film Evaporatos, " petrochemical industry the 7th volume, the 5th phase PP475-479.).
; after tube outer surface is strengthened with above-mentioned technology; the main thermal resistance of conducting heat changes in the pipe by pipe is outer again; so the someone will adopt the method for mechanical extended surface or insert to come augmentation of heat transfer again in the pipe again, to reach coupling (Newson, the I.H. of the inside and outside augmentation of heat transfer of pipe; Proceedings 6th Inter.Symp.; " Fresh water from the sea ", vol.2, PP.113－124，1978。）
Though the inside and outside method of above-mentioned enhanced tube can make the overall heat-transfer coefficient of horizontal tube bundle improve, but, pipe is outer to need other metal dust around connection and spraying process, this additional material has increased the possibility of heat-transfer pipe corrosion, and burning solution and spraying process will at high temperature operate, can increase the thermal stress of heat-transfer pipe like this, cause tubing not different, corrosion-vulnerable.In addition, the outer specification requirement height of pipe around connection and spraying process, processing cost is also high.Inside pipe wall adopts also difficulty of extended surface or insert processing.
The objective of the invention is to invent the horizontal tube fountain falling film evaporator of the inside and outside surface peening of a kind of evaporation tube, do not adopt the reinforcement means to cause the big cost of heat transfer area high and both made the reinforcement means that adopt machinery expansion or insert in externally sintered and spraying, the pipe of managing that adopted to solve fountain falling film evaporator in the prior art, but its specification requirement height, processing cost height, corrosion-prone problem.
Of the present invention being constructed as follows:
1,, the outer surface of pipe in the horizontal tube evaporator of stainless steel, titanium, carbon steel, copper material is corroded into porous surface with the method for electrochemical corrosion.These porous surfaces have formed the nucleate points of evaporation process, thereby have strengthened boiling heat transfer widely, thereby the heat transfer coefficient of evaporation side is improved.Experimental study shows that the heat transfer coefficient of porous water-glass facial canal evaporation side is up to 26000w/m
2K so just can make the heat transfer area of evaporimeter reduce.And the heat transfer coefficient of horizon light slip pipe evaporation side has only 10000w/m
2About k.
After the horizontal tube outer surface was made porous, evaporation side was conducted heat and has been obtained reinforcement, and at this moment, the in-tube condensation coefficient then becomes governing factor, when being smooth surface in the pipe, and the evaporation coefficient he/ condensation coefficient hc ≈ 2 after the reinforcement.Therefore, in this case, must manage condensation coefficient in the enhanced tube.
2, the electricity consumption chemical polishing make material be in the horizontal tube evaporator of stainless steel, titanium, carbon steel, copper the tube inner wall polishing reach reduce the surface can purpose.Obviously, the electricity consumption chemical polishing is simpler than adopting the technology of mechanical extended surface or insert in the pipe.According to condensation heat transfer mechanism, all can reduce metal pipe-wall surface can, therefore just can make film condensation change dropwise condensation into, the inside pipe wall condensation coefficient through electrochemical polish will improve greatly, be complementary with the high heat transfer coefficient that reaches the outer surface after strengthening with electrochemical corrosion.
Above-mentioned electrochemical corrosion metal tube outer surface and electrochemical polishing of metal pipe internal surface can be implemented on the same pipe of fountain falling film evaporator horizontal tube simultaneously; Also can taking to be electrochemical corrosion outside pipe according to different metal tubing and different evaporative mediums and different needs, is the form of plain tube in the pipe; Also can take in the pipe to electrochemical polish, be smooth surface or use sintering process that spraying process is processed as the form of porous surface, to reach the purpose of augmentation of heat transfer and pipe is outer.
Fig. 1 is a porous surface enlarged drawing outside the horizontal stainless steel tube pipe in the fountain falling film evaporator after electrochemical corrosion in the accompanying drawing.Fig. 2 is the sectional view (amplifying 32 times) of aperture on the porous surface of Fig. 1,5 hole/mm
2
Effect of the present invention is as follows:
1, make porous surface with electrochemical erosion method, can strengthen the heat transfer of fountain falling film evaporator, this compares with commonly used burning solution, spraying process, process easy, expense is low, can operate at normal temperatures.
2, the processing of electricity consumption chemical polishing is easier than processing with mechanical extended surface or insert in the inner surface of fountain falling film evaporation organ pipe, cost is low.
3, the fountain falling film evaporator made from the inside and outside method of enhanced tube of the present invention, its heat transfer area is little, and the cost of evaporimeter is low.
Example:
Single-action horizontal tube porous surface fountain falling film evaporator, totally ten eight pipes, three journeys, 0.7 meter of pipe range, caliber is φ 25 * 1, and heat transfer area is 1 square metre, and tubing is stainless steel, working medium is water, and water vapour is as thermal source, and overall heat-transfer coefficient is 4700～5500w/m under the normal pressure
2K.
Claims (2)
1, a kind of horizontal porous surface tube fountain falling film evaporator, the outer surface that it is characterized in that (1) horizontal tube is the electrochemical corrosion porous surface, inner surface is electrochemical polish surface or smooth surface, (2) inner surface of horizontal tube is the electrochemical polish surface, and pipe is outer for smooth surface or use around connection or spraying process and be processed as porous surface.
2, horizontal porous surface tube fountain falling film evaporator according to claim 1, the material that it is characterized in that tubing is stainless steel, titanium, copper, carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87200656 CN87200656U (en) | 1987-01-20 | 1987-01-20 | Spray falling-film evapouator with horizontal porous surface tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87200656 CN87200656U (en) | 1987-01-20 | 1987-01-20 | Spray falling-film evapouator with horizontal porous surface tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87200656U true CN87200656U (en) | 1988-05-04 |
Family
ID=4817047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87200656 Expired - Lifetime CN87200656U (en) | 1987-01-20 | 1987-01-20 | Spray falling-film evapouator with horizontal porous surface tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87200656U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108369079A (en) * | 2015-12-16 | 2018-08-03 | 开利公司 | Heat-transfer pipe for heat exchanger |
-
1987
- 1987-01-20 CN CN 87200656 patent/CN87200656U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108369079A (en) * | 2015-12-16 | 2018-08-03 | 开利公司 | Heat-transfer pipe for heat exchanger |
| CN108369079B (en) * | 2015-12-16 | 2020-06-05 | 开利公司 | Heat transfer tube for heat exchanger |
| US11015878B2 (en) | 2015-12-16 | 2021-05-25 | Carrier Corporation | Heat transfer tube for heat exchanger |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |