CN218295703U - Positive and negative helical fin vacuum heat pipe economizer device - Google Patents
Positive and negative helical fin vacuum heat pipe economizer device Download PDFInfo
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- CN218295703U CN218295703U CN202222515404.7U CN202222515404U CN218295703U CN 218295703 U CN218295703 U CN 218295703U CN 202222515404 U CN202222515404 U CN 202222515404U CN 218295703 U CN218295703 U CN 218295703U
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Abstract
The utility model discloses a positive and negative helical fin vacuum heat pipe economizer device, it includes: flue gas heat exchange case, cooler bin, vacuum heat pipe. The cooling box is fixed at the top of the flue gas heat exchange box, and inner cavities of the cooling box and the flue gas heat exchange box are isolated from each other; the vacuum heat pipe is vertically fixed on the flue gas heat exchange box, and the upper end of the vacuum heat pipe is positioned in the cooling box; the side wall of the flue gas heat exchange box is provided with an air inlet, the side wall of the flue gas heat exchange box opposite to the side wall of the flue gas heat exchange box is provided with an air outlet, a plurality of vertical vacuum heat pipes are arranged between the air inlet and the air outlet, the outer wall of each vacuum heat pipe is provided with a spiral fin, and the spiral directions of the spiral fins on the adjacent vacuum heat pipes are opposite on the flowing path of the flue gas from the air inlet to the air outlet. The utility model discloses a positive and negative helical fin vacuum heat pipe economizer device has overcome present power plant's low temperature economizer and has generally faced the problem that heat transfer effect is poor, it is big to occupy the space, the easy deposition of heat exchange tube and wearing and tearing and heat exchange tube break and can cause a large amount of cooling water to leak the flue gas in.
Description
Technical Field
The utility model relates to a flue gas of power plant handles the field, especially relates to a positive and negative helical fin vacuum heat pipe economizer device.
Background
The economizer is mainly a heat exchange device arranged in a flue at the tail of a boiler, and is mainly used for preheating flue gas at the tail of the boiler, improving the efficiency of the boiler and saving the coal consumption. The thermal power plant still has a very important position in the electric power industry of China, the current running status of the thermal power plant is mainly the non-uniformity of coal burning, and the load variability puts higher requirements on the running of a coal burning boiler.
At present, the low-temperature economizer of the flue gas heat exchanger of the domestic power plant adopts the traditional water pipe type gas-water heat exchanger, and the heat exchange pipe is directly arranged inside the flue. Due to the influence of the temperature of incoming water and the complex airflow environment in the flue, the traditional low-temperature economizer generally faces the conditions of low-temperature corrosion, leakage and blockage and poor heat transfer effect. With the increasing severity of the environmental protection form, the later-stage reconstruction amount of the thermal power plant is huge, so that the original flue type arrangement space cannot meet the increasingly strict environmental protection requirement. In order to better guarantee the service life of a tail flue of a thermal power plant and improve the heat exchange efficiency, the space form of the existing equipment is changed, and a novel heat exchanger form which is high in heat transfer effect and occupies a better space is introduced.
SUMMERY OF THE UTILITY MODEL
To the problem that the heat transfer effect is poor, take up space big, the easy deposition of heat exchange tube and wearing and tearing and the heat exchange tube breaks and can cause a large amount of cooling water to leak the flue gas that current power plant's low temperature economizer generally faces, the utility model provides a positive and negative helical fin vacuum heat pipe economizer device. Specifically, the technical scheme of the utility model is as follows.
A positive and negative helical fin vacuum heat pipe economizer device comprises: flue gas heat exchange case, cooler bin, vacuum heat pipe. Wherein: the cooling box is fixed on the top of the flue gas heat exchange box, and inner cavities of the cooling box and the flue gas heat exchange box are isolated from each other. The vacuum heat pipe is vertically fixed on the flue gas heat exchange box, the upper end of the vacuum heat pipe is positioned in the cooling box, and the cooling box is provided with a liquid inlet and a liquid outlet. The side wall of the flue gas heat exchange box is provided with an air inlet, the side wall of the flue gas heat exchange box opposite to the side wall of the flue gas heat exchange box is provided with an air outlet, a plurality of vertically arranged vacuum heat pipes are distributed between the air inlet and the air outlet, the outer wall of each vacuum heat pipe is connected with a spiral fin along the height direction of the vacuum heat pipe, and the spiral directions of the spiral fins on the adjacent vacuum heat pipes are opposite on the flow path of the flue gas from the air inlet to the air outlet so as to improve the chaos degree of the passing flue gas.
Furthermore, a plurality of rows of vacuum heat pipes are distributed on a flowing path of the flue gas from the gas inlet to the gas outlet, adjacent vacuum heat pipes are distributed at intervals, and the spiral directions of the spiral fins on the two adjacent rows of vacuum heat pipes are opposite.
Further, the spiral fins comprise forward spiral fins and reverse spiral fins, and the adjacent vacuum heat pipes are respectively connected with the forward spiral fins and the reverse spiral fins.
Furthermore, the vacuum heat pipe is a vacuum pipe, and water is contained in a pipe cavity of the vacuum heat pipe to be used as a circulating heat exchange medium. Optionally, the vacuum degree of the vacuum heat pipe is 1.2 × 10 -3 ～1.5×10 -4 Pa。
Furthermore, the height of water in the vacuum heat pipe is (0.2-0.35) x a, and a is the height of the part, located in the flue gas heat exchange box, of the vacuum heat pipe.
Furthermore, the upper end of the vacuum heat pipe sequentially penetrates through the top wall of the flue gas heat exchange box and the bottom surface of the cooling box and then enters the inner cavity of the cooling box, and the side wall of the vacuum heat pipe is in sealing connection with the top wall and the bottom surface.
Furthermore, the vacuum heat pipe is fixed in the flue gas heat exchange box through a support piece, the support piece is fixedly connected to the inner wall of the flue gas heat exchange box, and the vacuum heat pipe is fixedly connected with the support piece.
Further, the material of the vacuum heat pipe includes any one of aluminum alloy, stainless steel and the like.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) The utility model discloses a positive and negative helical fin vacuum heat pipe economizer device distributes through a plurality of roots side by side, and mutually independent vacuum heat pipe replaces heat exchanger in traditional power plant's low temperature economizer, not only can effectively reduce the volume of device, because what the vacuum heat pipe utilized is that the mode of water phase transition heat transfer wherein carries out the heat transfer moreover, has better heat exchange efficiency.
(2) Because the vacuum heat pipes in the flue gas heat exchange box are mutually independent, and only a small amount of water is used as a heat exchange medium, even if a certain vacuum heat pipe is broken under the long-time continuous washing of smoke dust, only a small amount of water in the vacuum heat pipe is leaked out, the water can be quickly volatilized and discharged along with the flue gas, and the problem that the smoke dust blocks a smoke exhaust pipeline due to the fact that a large amount of water is leaked into the flue gas because the heat exchange pipe is broken in the traditional low-temperature economizer is solved.
(3) The utility model discloses a set up spiral fin opposite in spiral direction on adjacent vacuum heat pipe to utilize the special flow field characteristic that these two kinds of spiral fin combinations formed at the in-process of flue gas process, make the flow direction of flue gas constantly switched over and change, can show the confusion degree that increases the flue gas, utilize the limited heat transfer area of vacuum heat pipe to increase heat exchange efficiency effectively. Meanwhile, the increase of the chaos degree of the flue gas flow field effectively reduces the dust deposition among the rear fins, and is beneficial to prolonging the service life of equipment.
Drawings
Fig. 1 is a front view of a gravity type heat pipe low-temperature economizer in an embodiment of the present invention.
Fig. 2 is a front view of the vacuum heat pipe and the spiral fin in the embodiment of the present invention.
The labels in the figures represent: 1-flue gas heat exchange box, 2-cooling box, 3-vacuum heat pipe, 4-forward spiral fin, 5-reverse spiral fin, 6-support piece, 101-air inlet, 102-air outlet, 201-liquid inlet, and 202-liquid outlet.
Detailed Description
It should be noted that in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and do not limit the structure, but merely facilitate the description of the present invention, and do not indicate or imply that the device or element being referred to needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. The technical solution of the present invention will be further explained with reference to the drawings and examples of the specification.
Referring to fig. 1 and 2, a positive and negative helical fin vacuum heat pipe economizer apparatus is illustrated, comprising: flue gas heat exchange box 1, cooling box 2, vacuum heat pipe 3. Wherein:
flue gas heat transfer case 1 and cooler bin 2 are the box, just cooler bin 2 welded fastening has the heat insulating board (like rock wool board etc.) at the top of flue gas heat transfer case 1 between the two to prevent that the refrigerant in the cooler bin 2 from revealing in to flue gas heat transfer case 1. The left and right side walls of the flue gas heat exchange box 1 are respectively provided with an air inlet 101 and an air outlet 102, and the air outlet 102 is positioned at the opposite side of the air inlet 101 so as to facilitate the input and the discharge of flue gas. The cooling tank 2 has an inlet 201 and an outlet 202 for the input and the discharge of a cooling medium (such as water).
The vacuum heat pipe 3 is a sealed pipe with a vacuum state in a pipe cavity, water is filled in the pipe cavity as a circulating heat exchange medium, and the vacuum degree in the vacuum heat pipe 3 is 1.2 multiplied by 10 -3 ～1.5×10 -4 Pa is between Pa. The height of water in the vacuum heat pipe 3 can be randomly selected between (0.2-0.35) x a, such as0.2a, 0.25a, 0.3a, 0.35a and the like, wherein a is the height of the part of the vacuum heat pipe 3 positioned in the flue gas heat exchange box 1. The material of the vacuum heat pipe 3 can be selected from aluminum alloy or stainless steel.
The vacuum heat pipe 3 is vertically fixed on the flue gas heat exchange box 1, the upper end of the vacuum heat pipe 3 sequentially penetrates through the top wall of the flue gas heat exchange box 1 and the bottom surface of the cooling box 2 and then enters the inner cavity of the cooling box 2, and the side wall of the vacuum heat pipe 3 is hermetically connected with the top wall and the bottom surface in a welding mode and the like. A plurality of rows of vertically arranged vacuum heat pipes 3 are distributed between the air inlet 101 and the air outlet 102. When the water in the vacuum heat pipe 3 is heated by the high-temperature flue gas, the water is gasified into steam and flows upwards, and the high-temperature flue gas is changed into low-temperature flue gas after being absorbed by the water in the vacuum heat pipe 3 and is discharged into the smoke exhaust pipeline from the air outlet 102. After the steam rises to the upper part of the vacuum heat pipe 3, the temperature of the steam is reduced under the action of a refrigerant in the cooling box 2 to form condensed water, and the condensed water is sunk to the bottom of the vacuum heat pipe 3 under the action of self gravity and exchanges heat with high-temperature flue gas again. By continuously repeating the phase change heat exchange process, the heat in the high-temperature flue gas can be continuously transferred to the refrigerant in the cooling box 2.
The vacuum heat pipes 3 which are distributed in parallel and are mutually independent are adopted to replace a heat exchanger in a traditional low-temperature economizer of a power plant, so that the volume of the device can be effectively reduced, and the vacuum heat pipes 3 exchange heat by utilizing a water phase-change heat transfer mode, so that the heat exchange efficiency is better. In addition, because the vacuum heat pipes in the flue gas heat exchange box 1 are mutually independent, and only a small amount of water is used as a heat exchange medium, even if a certain vacuum heat pipe 3 is broken under the long-time continuous washing of smoke dust, only a small amount of water in the vacuum heat pipe 3 is leaked out, the water can be quickly volatilized and discharged along with the flue gas, and the problem that the smoke dust blocks a smoke exhaust pipeline due to the fact that a large amount of water is leaked into the flue gas because a heat exchange pipe is broken as in the conventional low-temperature economizer is solved.
Furthermore, the outer wall of the vacuum heat pipe 3 is connected with helical fins along the height direction thereof, the helical fins comprise forward helical fins 4 and reverse helical fins 5, and the adjacent vacuum heat pipes 3 are respectively connected with the forward helical fins 4 and the reverse helical fins 5. The vacuum heat pipes 3 are distributed on a flowing path of the flue gas from the gas inlet 101 to the gas outlet 102, the adjacent vacuum heat pipes 3 are distributed at intervals, the spiral directions of the spiral fins on the two adjacent rows of vacuum heat pipes 3 are opposite, and the vacuum heat pipe rows with the forward spiral fins 4 and the reverse spiral fins 5 are distributed in a staggered mode. By arranging the spiral fins with opposite spiral directions on the adjacent vacuum heat pipes 3, the special flow field characteristic formed by combining the two spiral fins is utilized in the process of passing the flue gas, so that the flow direction of the flue gas is continuously switched and changed (refer to fig. 2), the chaos of the flue gas can be obviously increased, and the limited heat exchange area of the vacuum heat pipes 3 is effectively utilized to increase the heat exchange efficiency. Meanwhile, the increase of the chaos degree of the flue gas flow field effectively reduces the dust deposition among the rear fins, and is beneficial to prolonging the service life of equipment.
Referring to fig. 1, in another embodiment, in the positive and negative helical fin vacuum heat pipe economizer apparatus exemplified in the above embodiment, the vacuum heat pipe 3 is fixed in the flue gas heat exchange box 1 through a support member 6, and the support member 6 is fixedly connected to the inner wall of the flue gas heat exchange box 1, and the vacuum heat pipe 3 is fixedly connected to the support member 6.
Finally, it should be understood that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (9)
1. The utility model provides a positive and negative helical fin vacuum heat pipe economizer device which characterized in that includes: a flue gas heat exchange box, a cooling box and a vacuum heat pipe; wherein: the cooling box is fixed at the top of the flue gas heat exchange box, and inner cavities of the cooling box and the flue gas heat exchange box are isolated from each other; the vacuum heat pipe is vertically fixed on the flue gas heat exchange box, the upper end of the vacuum heat pipe is positioned in the cooling box, and the cooling box is provided with a liquid inlet and a liquid outlet; the side wall of the flue gas heat exchange box is provided with an air inlet, the side wall of the flue gas heat exchange box opposite to the air inlet is provided with an air outlet, a plurality of vertically arranged vacuum heat pipes are distributed between the air inlet and the air outlet, the outer wall of each vacuum heat pipe is connected with a spiral fin along the height direction of the vacuum heat pipe, and the spiral directions of the spiral fins on the adjacent vacuum heat pipes are opposite on the flow path of the flue gas from the air inlet to the air outlet.
2. The positive and negative helical fin vacuum heat pipe economizer device of claim 1 wherein a plurality of rows of said vacuum heat pipes are distributed on the flow path of the flue gas from said gas inlet to said gas outlet, adjacent vacuum heat pipes are spaced apart, and the helical fins on two adjacent rows of vacuum heat pipes have opposite helical directions.
3. The positive and negative helical fin vacuum heat pipe economizer device of claim 2 wherein the helical fins comprise a positive helical fin and a negative helical fin, and the positive helical fin and the negative helical fin are respectively connected to adjacent vacuum heat pipes.
4. The positive and negative helical fin vacuum heat pipe economizer device of claim 1 wherein the vacuum heat pipe is a vacuum pipe with a water chamber.
5. The positive and negative helical fin vacuum heat pipe economizer device of claim 4 wherein the vacuum degree of the vacuum heat pipe is 1.2 x 10 -3 ～1.5×10 -4 Pa。
6. The positive and negative helical fin vacuum heat pipe economizer device of claim 4 wherein the height of water in the vacuum heat pipe is (0.2-0.35) x a, said a being the height of the portion of the vacuum heat pipe in the flue gas heat exchange box.
7. The positive and negative helical fin vacuum heat pipe economizer device of any one of claims 1-6 wherein the upper end of the vacuum heat pipe passes through the top wall of the flue gas heat exchange box and the bottom surface of the cooling box in sequence and then enters the inner cavity of the cooling box, and the side wall of the vacuum heat pipe is hermetically connected with the top wall and the bottom surface.
8. The positive and negative helical fin vacuum heat pipe economizer device of any one of claims 1-6 wherein the vacuum heat pipe is fixed in the flue gas heat exchange box by a support member, and the support member is fixedly connected to the inner wall of the flue gas heat exchange box, and the vacuum heat pipe is fixedly connected with the support member.
9. The positive and negative helical fin vacuum heat pipe economizer device of any one of claims 1 to 6 wherein the material of the vacuum heat pipe comprises any one of aluminum alloy and stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222515404.7U CN218295703U (en) | 2022-09-22 | 2022-09-22 | Positive and negative helical fin vacuum heat pipe economizer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222515404.7U CN218295703U (en) | 2022-09-22 | 2022-09-22 | Positive and negative helical fin vacuum heat pipe economizer device |
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| Publication Number | Publication Date |
|---|---|
| CN218295703U true CN218295703U (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222515404.7U Active CN218295703U (en) | 2022-09-22 | 2022-09-22 | Positive and negative helical fin vacuum heat pipe economizer device |
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| Country | Link |
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| CN (1) | CN218295703U (en) |
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- 2022-09-22 CN CN202222515404.7U patent/CN218295703U/en active Active
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