CN111964482A - Winding tube type evaporator - Google Patents
Winding tube type evaporator Download PDFInfo
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- CN111964482A CN111964482A CN202010848380.XA CN202010848380A CN111964482A CN 111964482 A CN111964482 A CN 111964482A CN 202010848380 A CN202010848380 A CN 202010848380A CN 111964482 A CN111964482 A CN 111964482A
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- pipe
- spiral winding
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- shell
- winding pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model provides a winding tubular evaporator, including spiral winding pipe, the baffling board, the feed liquor pipeline, pipe side export pipeline and return air adjustment pipeline, spiral winding pipe segmentation sets up, the baffling board sets up between two sections adjacent spiral winding pipes, the baffling board includes the breach, exhaust chamber and air intake mixing chamber, two sections adjacent spiral winding pipes pass through the breach intercommunication, exhaust chamber and air intake mixing chamber intercommunication, exhaust chamber and preceding section spiral winding pipe intercommunication, air intake mixing chamber and the intercommunication of following section spiral winding pipe, the feed liquor pipeline respectively with first section spiral winding pipe, each air intake mixing chamber intercommunication, pipe side export pipeline respectively with last section spiral winding pipe, each exhaust chamber intercommunication, return air adjustment pipeline respectively with pipe side export pipeline, each air intake mixing chamber intercommunication. The evaporator can effectively adjust the dryness of the tube side to be in the most efficient evaporation heat exchange area, eliminate the flowing dead zone of the shell side, strengthen the disturbance of fluid of the shell side, finally strengthen the heat exchange of the tube side and the heat transfer of the shell side, and improve the integral heat exchange uniformity of the evaporator.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a wound tube type evaporator.
Background
The wound tube evaporator is an important unit device in the fields of petrochemical industry, LNG (liquefied natural gas) process, methanol production, fine chemical industry and the like, and is a high-efficiency heat exchange device. Because traditional winding tubular evaporator, its spiral winding tube bank is incessant spiral coiling, and set up the water conservancy diversion filler strip between different pipe networks, the shell side is difficult to set up the baffling board, and the fluid heat transfer flow that causes traditional winding tubular evaporator is shorter, can appear the velocity of flow to be detained the region between the adjacent intertube of same floor pipe network, especially the region can cause the flow blind spot between filler strip and the heat exchange tube, and heat exchange efficiency is difficult to further improve, and the whole heat transfer of evaporimeter is inhomogeneous moreover, and heat transfer capacity exists certain waste.
Therefore, further improvements are needed.
Disclosure of Invention
The invention aims to provide the winding tube type evaporator which is simple and reasonable in structure, excellent in performance, good in heat exchange effect, energy-saving, environment-friendly, low in manufacturing cost, easy to realize, safe, reliable and strong in practicability, so that the defects in the prior art are overcome.
A wound tube evaporator designed for this purpose comprises a spirally wound tube, characterized in that: the spiral winding pipe is arranged in a segmented mode, the baffle plate is arranged between two adjacent sections of spiral winding pipes and comprises a notch, an exhaust cavity and an air inlet mixing cavity, the two adjacent sections of spiral winding pipes are communicated through the notch, the exhaust cavity is communicated with the air inlet mixing cavity, the exhaust cavity is communicated with the previous section of spiral winding pipe, the air inlet mixing cavity is communicated with the next section of spiral winding pipe, the liquid inlet pipeline is communicated with the first section of spiral winding pipe and each air inlet mixing cavity respectively, the pipe side outlet pipeline is communicated with the last section of spiral winding pipe and each exhaust cavity respectively, and the air return adjusting pipeline is communicated with the pipe side outlet pipeline and each air inlet mixing cavity respectively.
The liquid inlet pipeline is communicated with the first section of spiral winding pipe through the front pipeline section, and the pipeline side outlet pipeline is communicated with the last section of spiral winding pipe through the rear pipeline section.
The pressure-expanding device is characterized in that a first flowmeter is arranged at the position, located on the front side of the front pipe section, of the liquid inlet pipeline, a second flowmeter and a control valve are sequentially arranged on the air return adjusting pipeline along the direction of air flow in the pipe, and a pressure-expanding device is connected between the pipe side outlet pipeline and the air return adjusting pipeline. The pressure-expanding device is used for pressurizing working medium at the outlet of the rear pipe section, and after pressurization, the working medium pressure P1 is more than the maximum inlet pressure P2 in the liquid inlet pipeline at the pipe side of the wound pipe type evaporator.
The spiral winding pipe comprises a first shell, a plurality of layers of spiral winding pipe sections and straight pipe sections, wherein the spiral winding pipe sections and the straight pipe sections are arranged in the first shell, the straight pipe sections are arranged at two ends of the spiral winding pipe sections and comprise an inlet straight pipe section and an outlet straight pipe section, the inlet straight pipe section of the rear section of spiral winding pipe is connected with the air inlet mixing cavity, and the outlet straight pipe section of the front section of spiral winding pipe is connected with the air exhaust cavity.
The baffle plate comprises a second shell, flanges are arranged on two sides of the first shell and two sides of the second shell, and the first shell and the second shell are connected in a sealing mode through the flanges to form a continuous shell side heat exchange area.
A partition plate is integrally arranged in the second shell, and a gap, an exhaust cavity and an air inlet mixing cavity are formed between the partition plate and the second shell respectively.
The cross-sectional area of the notch is less than or equal to 1/3 of the cross-sectional area of the second housing cavity.
The front pipe section and the first section of spiral winding pipe are separated through a pipe plate at one end of the evaporator, and the rear pipe section and the last section of spiral winding pipe are separated through a pipe plate at the other end of the evaporator so as to divide the evaporator into a pipe pass heat exchange area and a shell pass heat exchange area.
The shell wall of the exhaust cavity is provided with an exhaust port, an outlet pipeline at the pipe side is connected with the exhaust port, the shell wall of the air inlet mixing cavity is provided with a liquid inlet and an air inlet, the liquid inlet pipeline is connected with the liquid inlet, and the air return adjusting pipeline is connected with the air inlet.
The bottom of the first spiral winding pipe is provided with a shell pass inlet, and the top of the last spiral winding pipe is provided with a shell pass outlet.
The evaporator effectively solves the problems that the heat exchange efficiency of the tube pass of the common wound tube evaporator is low in a low-dryness area, the shell pass is difficult to be provided with the baffle plate, the fluid heat exchange flow of the traditional wound tube evaporator is short, the shell pass turbulence is insufficient, the integral heat exchange of the evaporator is uneven, and the heat exchange capacity is wasted to a certain extent; compared with the traditional evaporator, the evaporator is wound on the tube bundle spirally by sections, and middle regulation and control dryness baffle plates and auxiliary components are arranged between different wound tube bundles, so that the tube pass dryness is effectively regulated to be in the most efficient evaporation heat exchange area, the shell pass flowing dead zone is eliminated, the shell pass fluid disturbance is strengthened, the heat transfer of the tube pass and the shell pass is finally strengthened, the material and energy are saved, and the integral heat exchange uniformity of the evaporator is improved.
Drawings
Fig. 1 is a partial sectional structural schematic view of an evaporator according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a baffle in an embodiment of the present invention.
FIG. 3 is a schematic diagram of the high efficiency evaporation zone of the evaporator according to one embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1-2, the winding tube evaporator comprises spiral winding tubes 1, baffle plates 2, a liquid inlet pipeline 3, a tube side outlet pipeline 4 and a gas return regulating pipeline 5, wherein the spiral winding tubes 1 are arranged in sections, the baffle plates 2 are arranged between two adjacent sections of the spiral winding tubes 1, the baffle plates 2 comprise gaps 21, the exhaust cavity 23 and the air intake mixing cavity 22, two adjacent sections of spiral winding pipes 1 are communicated through a notch 21, the exhaust cavity 23 is communicated with the air intake mixing cavity 22, the exhaust cavity 23 is communicated with the previous section of spiral winding pipe 1, the air intake mixing cavity 22 is communicated with the next section of spiral winding pipe 1, the liquid inlet pipeline 3 is respectively communicated with the first section of spiral winding pipe 1 and each air intake mixing cavity 22, the pipe side outlet pipeline 4 is respectively communicated with the last section of spiral winding pipe 1 and each exhaust cavity 23, and the return air adjusting pipeline 5 is respectively communicated with the pipe side outlet pipeline 4 and each air intake mixing cavity 22.
The spiral liquid feeding device is characterized by further comprising a front pipe section 7 and a rear pipe section 8, wherein the front pipe section 7 is arranged at the front end of the first spiral winding pipe 1, the rear pipe section 8 is arranged at the rear end of the last spiral winding pipe 1, the liquid feeding pipeline 3 is communicated with the first spiral winding pipe 1 through the front pipe section 7, and the pipe side outlet pipeline 4 is communicated with the last spiral winding pipe 1 through the rear pipe section 8.
A first flowmeter 31 is arranged on the liquid inlet pipeline 3 at the front side of the front pipe section 7, a second flowmeter 51 and a control valve 52 are sequentially arranged on the air return adjusting pipeline 5 along the direction of air flow in the pipe, and a diffuser 41 is connected between the pipe side outlet pipeline 4 and the air return adjusting pipeline 5.
The spiral winding pipe 1 comprises a first shell 13, a plurality of layers of spiral winding pipe sections 11 and straight pipe sections 12, wherein the spiral winding pipe sections 11 and the straight pipe sections 12 are arranged in the first shell 13, the straight pipe sections 12 are arranged at two ends of the spiral winding pipe sections 11 and comprise an inlet straight pipe section 121 and an outlet straight pipe section 122, the air inlet mixing cavity 22 is connected with the inlet straight pipe section 121 of the rear section of spiral winding pipe 1, and the exhaust cavity 23 is connected with the outlet straight pipe section 122 of the front section of spiral winding pipe 1.
The baffle plate 2 comprises a second shell 28, flanges 9 are arranged on two sides of the first shell 13 and two sides of the second shell 28, the first shell 13 and the second shell 28 are connected in a sealing mode at intervals through the flanges 9 to form a continuous shell side heat exchange area, and the flanges 9 of the first shell 13 and the flanges 9 of the second shell 28 can be connected through screws. The cross-section of the first housing 13 and the second housing 28 may be circular, square, polygonal, or the like.
A partition plate 24 is integrally arranged in the second shell 28, and a gap 21, an exhaust cavity 23 and an air inlet mixing cavity 22 are respectively formed between the partition plate 24 and the second shell 28; the gap 21, the exhaust chamber 23 and the intake mixing chamber 22 can be separated by the partition plate 24, and the partition plate 24 and the second housing 28 are integrally arranged, so that the processing of the baffle plate 2 is more convenient.
The cross-sectional area of the notch 21 is less than or equal to 1/3 of the cross-sectional area of the cavity of the second housing 28.
The front pipe section 7 and the first section of the spiral winding pipe 1 are separated by a pipe plate 6 at one end of the evaporator, and the rear pipe section 8 and the last section of the spiral winding pipe 1 are separated by a pipe plate 6 at the other end of the evaporator, so that the evaporator is divided into a pipe side heat exchange area and a shell side heat exchange area.
The shell wall of the exhaust cavity 23 is provided with an exhaust port 27, the pipe side outlet pipeline 4 is connected with the exhaust port 27, the shell wall of the air inlet mixing cavity 22 is provided with a liquid inlet 26 and an air inlet 25, the liquid inlet pipeline 3 is connected with the liquid inlet 26, and the return air adjusting pipeline 5 is connected with the air inlet 25.
The bottom of the first spiral winding pipe 1 is provided with a shell pass inlet 14, and the top of the last spiral winding pipe 1 is provided with a shell pass outlet 15.
Referring to fig. 3, the high-efficiency evaporation area of the two-phase area is located between approximately 0.7-0.9 of the dryness area, so that the dryness of the working medium at the tube side inlet of the wound tube evaporator is adjusted to be located in the high-efficiency evaporation area, and the whole-process high-efficiency evaporation heat exchange can be achieved.
The working principle of the winding tube type evaporator is as follows:
tube side:
the heat exchange fluid of the tube pass is introduced from a tube side liquid inlet pipeline 3, passes through a first flowmeter 31 and then enters the gas inlet mixing cavity 22 from a front tube section 7 and a liquid inlet 26 of the baffle plate 2; gaseous working medium obtained by the pre-heat exchange operation of the air inlet mixing cavity 22 is discharged through an air outlet 27 of an air exhaust cavity 23 in a baffle plate 2, the gaseous working medium is collected by an outlet pipeline 4 at the pipe side, and then flows through a pressure expansion device 41 for pressurization, so that the static pressure of the pressurized outlet gaseous working medium is higher than that of an inlet 26 of each baffle plate 2, at the moment, the pressurized outlet gaseous working medium passes through an air return adjusting pipeline 5, the flow rate is controlled by a control valve 52, the flow rate is measured by a second flow meter 51, then the air return adjusting pipeline 5 conveys part of high-pressure gaseous working medium to return to the air inlet mixing cavity 22 from an air inlet 25, at the moment, the gaseous working medium of the air return adjusting pipeline 5 and the liquid working medium of the inlet pipeline 3 at the pipe side are fully mixed in the air inlet mixing cavity 22, the dryness of the working medium of the air inlet mixing cavity 22 is adjusted by the control valve 52 to reach a high-, the heat enters each segmented spiral winding pipe 1 through the straight pipe section 12 to carry out efficient evaporation and heat exchange, and the process is continuously repeated. The high-efficiency evaporation dryness area control of the mixed working medium in the air inlet mixing cavity 22 is realized by respectively and accurately measuring the flow rates of the liquid-phase working medium and the gas-phase working medium by the first flow meter 31 and the second flow meter 51 and accurately controlling the flow rates by the control valve 52.
Shell side:
the shell-side fluid enters the spiral winding pipe 1 through the shell-side inlet 61 to carry out shell-side heat exchange, is repeatedly baffled through the baffle plate 2 (enters the baffle plate 2 from the notch 21), and then is discharged out of the evaporator through the shell-side outlet 62; after the shell pass fluid passes through the baffle plate 2, the flow velocity is accelerated, the disturbance is strengthened, and because the fluid flow is longitudinal and transverse, the flow dead zone is effectively eliminated, the uniformity of the space heat exchange of the evaporator is effectively improved, and the heat exchange efficiency is finally effectively improved.
The above only lists specific working processes of single-flow embodiments, and according to the principles of the present invention, more embodiments with different flows can be developed, and the working processes thereof are similar, and the present invention is not listed one by one.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be protected by the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A wound tube evaporator comprising a helically wound tube (1), characterized in that: the spiral winding pipe is characterized by further comprising baffle plates (2), liquid inlet pipelines (3), pipe side outlet pipelines (4) and air return adjusting pipelines (5), wherein the spiral winding pipes (1) are arranged in a segmented mode, the baffle plates (2) are arranged between two adjacent sections of spiral winding pipes (1), each baffle plate (2) comprises a notch (21), an exhaust cavity (23) and an air inlet mixing cavity (22), the two adjacent sections of spiral winding pipes (1) are communicated through the notches (21), the exhaust cavity (23) is communicated with the air inlet mixing cavity (22), the exhaust cavity (23) is communicated with the previous section of spiral winding pipe (1), the air inlet mixing cavity (22) is communicated with the next section of spiral winding pipe (1), the liquid inlet pipelines (3) are respectively communicated with the first section of spiral winding pipe (1) and the air inlet mixing cavities (22), the pipe side outlet pipelines (4) are respectively communicated with the last section of spiral winding pipe (1) and the exhaust cavities (23), the air return adjusting pipeline (5) is respectively communicated with the pipe side outlet pipeline (4) and each air inlet mixing cavity (22).
2. The wound tube evaporator of claim 1, wherein: the spiral winding type liquid level meter is characterized by further comprising a front pipe section (7) and a rear pipe section (8), wherein the front pipe section (7) is arranged at the front end of the first spiral winding pipe (1), the rear pipe section (8) is arranged at the rear end of the last spiral winding pipe (1), the liquid inlet pipeline (3) is communicated with the first spiral winding pipe (1) through the front pipe section (7), and the pipe side outlet pipeline (4) is communicated with the last spiral winding pipe (1) through the rear pipe section (8).
3. The wound tube evaporator of claim 2, wherein: the liquid inlet pipeline (3) is provided with a first flowmeter (31) at the front side of the front pipe section (7), the air return adjusting pipeline (5) is sequentially provided with a second flowmeter (51) and a control valve (52) along the direction of air flow in the pipe, and a pressure expanding device (41) is connected between the pipe side outlet pipeline (4) and the air return adjusting pipeline (5).
4. The wound tube evaporator of claim 1, wherein: spiral winding pipe (1) includes first shell (13), multilayer spiral winding pipe section (11) and straight tube section (12), spiral winding pipe section (11) and straight tube section (12) all set up in first shell (13), straight tube section (12) set up the both ends in spiral winding pipe section (11), including import straight tube section (121) and export straight tube section (122), import straight tube section (121) of one section spiral winding pipe (1) after air inlet mixing chamber (22) is connected, export straight tube section (122) of one section spiral winding pipe (1) before air discharge chamber (23) are connected.
5. The wound tube evaporator of claim 4, wherein: the baffle plate (2) comprises a second shell (28), flanges (9) are arranged on two sides of the first shell (13) and two sides of the second shell (28), and the first shell (13) and the second shell (28) are connected in a sealing mode at intervals through the flanges (9) to form a continuous shell side heat exchange area.
6. The wound tube evaporator of claim 5, wherein: a partition plate (24) is integrally arranged in the second shell (28), and a gap (21), an exhaust cavity (23) and an air inlet mixing cavity (22) are respectively formed between the partition plate (24) and the second shell (28).
7. The wound tube evaporator of claim 6, wherein: the cross-sectional area of the notch (21) is less than or equal to 1/3 of the cross-sectional area of the cavity of the second shell (28).
8. The wound tube evaporator of claim 2, wherein: the front pipe section (7) and the first section of the spiral winding pipe (1) are separated through a pipe plate (6) at one end of the evaporator, and the rear pipe section (8) and the last section of the spiral winding pipe (1) are separated through a pipe plate (6) at the other end of the evaporator so as to separate the evaporator into a pipe pass heat exchange area and a shell pass heat exchange area.
9. The wound tube evaporator of claim 5, wherein: the shell wall of the exhaust cavity (23) is provided with an exhaust port (27), the pipe side outlet pipeline (4) is connected with the exhaust port (27), the shell wall of the air inlet mixing cavity (22) is provided with a liquid inlet (26) and an air inlet (25), the liquid inlet pipeline (3) is connected with the liquid inlet (26), and the return air adjusting pipeline (5) is connected with the air inlet (25).
10. The wound tube evaporator according to any one of claims 1-9, wherein: the bottom of the first spiral winding pipe (1) is provided with a shell pass inlet (14), and the top of the last spiral winding pipe (1) is provided with a shell pass outlet (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010848380.XA CN111964482A (en) | 2020-08-21 | 2020-08-21 | Winding tube type evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010848380.XA CN111964482A (en) | 2020-08-21 | 2020-08-21 | Winding tube type evaporator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111964482A true CN111964482A (en) | 2020-11-20 |
Family
ID=73391226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010848380.XA Pending CN111964482A (en) | 2020-08-21 | 2020-08-21 | Winding tube type evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111964482A (en) |
-
2020
- 2020-08-21 CN CN202010848380.XA patent/CN111964482A/en active Pending
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