NL2029612B1

NL2029612B1 - Stainless-steel finned-tube condensation heat exchanger

Info

Publication number: NL2029612B1
Application number: NL2029612A
Authority: NL
Inventors: Zhang Kai; Wang Jincheng; Pang Erzong
Original assignee: Linyi Ouke Energy Saving Tech Co Ltd /
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2023-06-02

Abstract

The present invention discloses a stainless-steel finned-tube condensation heat exchanger, which belongs to the technical field of heating and ventilation and is used for daily heating and warming. The stainless-steel flnned-tube condensation heat exchanger comprises a combustion heat supply channel consist of a heat exchanger shell, a combustor, a flue gas baffle and a flue gas exhaust pipe, and a heat exchange condensation channel consist of a water inlet, a lower water tank, a lower ring groove, an outer flnned-tube, a middle flnned-tube, an inner finned-tube, an upper ring groove, an upper water tank and a water outlet. The present invention is a full counter-current design. Along the flow direction, the flue gas temperature goes from high to low, and the water temperature goes from low to high. During the limited flow time, water is constantly heated at all times, satisfying the full exchange of heat and improving the thermal efficiency.

Description

STAINLESS-STEEL FINNED-TUBE CONDENSATION HEAT EXCHANGER

TECHNICAL FIELD

[01] The present invention belongs to the technical field of heating and ventilation, and specifically relates to a stainless-steel finned-tube condensation heat exchanger.

BACKGROUND ART

[02] Most of the existing condensation heat exchangers used for heating are made of silicon aluminum alloy and stainless-steel, and the heat transfer medium is water.

Although silicon aluminum alloy products have good thermal conductivity, they have the disadvantages of poor corrosion resistance and low bearing pressure. Commonly used stainless-steel heat exchange tubes mostly adopt horizontal tubes and coiled tubes, unreasonable in the design, difficult for water to self-circulate, and prone to cavitation and dry heating, and also has problems such as high failure rate and short service life.

SUMMARY

[03] The present invention aims to provide a stainless-steel finned-tube condensation heat exchanger which can solve the corrosion problem caused by long-time use. The heat exchange tubes adopt finned-tubes, improving the heat exchange rate by more than 4 times compared with that of smooth tubes in the same size. The advanced vertical tube structure realizes the self-circulation of boiler water, and eliminates the cavitation and dry heating of the pipeline. The whole heat exchanger adopts a full counter-current design to ensure the sufficient exchange of heat.

The temperature of the exhaust flue gas is close to the water temperature of the water return port, which maximizes the efficiency of heat use.

[04] In order to achieve the purpose, the present invention is realized through the following technical scheme:

[05] The stainless-steel finned-tube condensation heat exchanger comprises a combustion heat supply channel consist of a heat exchanger shell, a combustor, a flue gas baffle and a flue gas exhaust pipe, and a heat exchange condensation channel consist of a water inlet, a lower water tank, a lower ring groove, an outer finned-tube, a middle finned-tube, an inner finned-tube, an upper ring groove, an upper water tank and a water outlet.

[06] Furthermore, the combustor is positioned at the center of the heat exchanger, the flue gas baffle plate is positioned at a lower part of the combustor, and the inner finned-tube, the middle finned-tube and the outer finned-tube are uniformly arranged around the combustor as the center according to different radii.

[07] Furthermore, the lower ring groove is positioned in the lower water tank at the bottom of the heat exchanger and can introduce water in the middle finned-tube into the inner finned-tube; and the upper ring groove is positioned in the upper water tank at the upper part of the heat exchanger and can introduce water in the outer finned-tube into the middle finned-tube.

[08] Furthermore, the water inlet is arranged at a side of a bottom the heat exchanger and is connected with the lower water tank. The water outlet is positioned at an upper side of the heat exchanger and is connected with the upper water tank.

[09] Further, the heat exchanger shell encloses the entire system inside.

[10] Compared with the prior art, the present invention has the following beneficial effects: [MI] The present invention is a full counter-current design. High-temperature flue gas generated during combustion of the combustor flows from top to bottom and from inside to outside, and heat is output through the regularly arranged finned-tubes. While the circulating water in the heat exchanger flows from bottom to top and from outside to inside just in the opposite direction. The temperature gradually absorbs the heat of the flue gas of the combustion system from low to high in the flowing process, so that the temperature of the discharged water is highest, the heat absorption is most sufficient, and the heat efficiency is highest. Due to the fact that the finned-tubes are vertically provided, solving the problems of unsmooth water flow and dry heating of the heat exchanger, and reducing the failure rate of the heat exchanger. The flue gas exhaust port is arranged at the bottom of the heat exchanger, conducive to discharging the condensed water generated by the flue gas. The whole heat exchanger is made of stainless-steel, completely avoiding the problem of condensate corrosion; and the service life of the product will not be affected even if the water quality is slightly poor.

BRIEFT DESCRIPTION OF THE DRAWINGS

[12] FIG. 1 is a schematic diagram of the structure of the present invention.

[13] In the drawings: 1, water outlet; 2, heat exchanger shell; 3, flue gas baffle; 4, water inlet; 5, lower ring groove; 6, flue gas exhaust pipe; 7, lower water tank; 8, outer finned-tubes; 9, middle finned-tube; 10, inner finned-tube; 11, upper water tank; 12, upper ring groove; and 13, combustor.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[14] Technical solutions described herein will be further described with reference to the accompanying drawings and examples.

[15] Example 1: A stainless-steel finned-tube condensation heat exchanger comprises a combustion heat supply channel consisting of a heat exchanger shell 2, a combustor 13, a flue gas baffle 3 and a flue gas exhaust pipe 6 and a heat exchange condensation channel consisting of a water inlet 4, a lower water tank 7, a lower ring groove 5, an outer finned-tube 8, a middle finned-tube 9, an inner finned-tube 10, an upper ring groove 12, an upper water tank 11 and a water outlet 1. The combustor 13 is positioned at the center of the heat exchanger, the flue gas baffle 3 is positioned at a lower part of the combustor, and the outer finned-tube 8, the middle finned-tube 9 and the inner finned-tube 10 are uniformly arranged around the combustor 13 as the center according to different radii. The lower ring groove 5 is positioned in the lower water tank 7 at a bottom of the heat exchanger, and can introduce water in the middle finned-tube 9 into the inner finned-tube 10. The upper ring groove 12 is positioned in the upper water tank 11 on an upper of the heat exchanger, and can introduce water in the outer finned-tube 8 into the middle finned-tube 9. The water inlet 5 is positioned on a bottom side of the heat exchanger and is connected with the lower water tank 7. The water outlet 1 1s positioned on an upper side of the heat exchanger and is connected with the upper water tank 11. The heat exchanger shell 2 encloses the entire system inside.

[16] In view of the embodiment, when the stainless-steel finned-tube condensation heat exchanger operates, a mixed gas of fuel gas and air with certain pressure enters the combustor 13 from the upper part for ignition and combustion. Since the bottom of the combustor 13 is provided with the flue gas baffle 3, heat and flus gas generated during combustion pass through the inner finned-tube 10 firstly, and then pass through the middle finned-tube 9 and the outer finned-tube 8. After the flue gas and the finned-tubes are fully contacted, the water temperature in the finned-tube gradually increases, and the flue gas temperature gradually decreases, realizing the heat exchange. The flue gas with reduced temperature continues to flow down along a gap around the flue gas baffle 3; and at the lower part of the flue gas baffle 3, the residual heat flows through the outer finned-tube 8, the middle finned-tube 9, and the inner finned-tube 10, realizing the overall output of the residual heat; and finally the flue gas is discharged from the heat exchanger through the flue gas exhaust pipe 6. The flue gas flow direction is shown in detail by solid arrows in the figure.

[17] Meanwhile, water with certain pressure flows into the lower water tank 7 from the water inlet 4. The water entering the lower water tank 7 flows upwards along the outer finned-tube 8 to reach the upper ring groove 12 at the top because the outer finned-tube 8 is opened in the lower water tank 7. The water continues to flow into the middle finned-tube 9 along the upper ring groove 12, and flows downwards along the middle finned-tube 9 to enter the lower ring groove 5 in the lower water tank 7. Like the function of the upper ring groove 12, the lower ring groove 5 connects the outlet of the middle finned-tubes 9 and the inlet of the inner finned-tubes 10 together. The water flows upward along the inner finned-tube 10 and finally flows into the upper water tank 11. During this flow, the water continuously absorbs heat, and the temperature continuously rises, reaching the highest temperature when arriving at the upper water tank 11. Finally, the water flows out of the heat exchanger along the water outlet 1. The water flow direction is shown in detail by dotted arrows in the figure.

[18] In the full counterflow flowing process, the flue gas temperature goes high to low, and the water temperature goes low to high, ensuring that the water is constantly 5 heated within the limited flow time, which satisfies the full exchange of heat and improves the thermal efficiency.

Claims

ConclusiesConclusions

1. Condensatiewarmtewisselaar met een roestvrijstalen lamellenbuis, die een verbrandingswarmtetoevoerkanaal omvat dat bestaat uit een warmtewisselaarschil 2, een verbrander 13, een rookgasschot 3 en een rookgasuitlaatpijp 6 en een warmtewisselingscondensatiekanaal dat bestaat uit een warmte-inlaat 4, een onderste watertank 7, een onderste ringgroef 5, een buitenste lamellenbuis 8, een middelste lamellenbuis 9, een binnenste lamellenbuis 10, een bovenste ringgroef 12, een bovenste watertank 11 en een wateruitlaat 1.1. Condensing heat exchanger with a stainless steel finned tube, which includes a combustion heat supply channel consisting of a heat exchanger shell 2, a combustor 13, a flue gas baffle 3 and a flue gas outlet pipe 6 and a heat exchange condensation channel consisting of a heat inlet 4, a lower water tank 7, a lower annular groove 5, an outer fin tube 8, a middle fin tube 9, an inner fin tube 10, an upper ring groove 12, an upper water tank 11 and a water outlet 1.

2. Condensatiewarmtewisselaar met een roestvrijstalen lamellenbuis volgens conclusie 1, met het kenmerk, dat: de warmtewisselingspijplijn een lamellenbuis structuur aanneemt, en de buitenste lamellenbuis 8, de middelste lamellenbuis 9 en de binnenste lamellenbuis 10 uniform gerangschikt zijn rondom de verbrander 13 als het middelpunt volgens verschillende stralen.The stainless steel finned tube condensation heat exchanger according to claim 1, characterized in that : the heat exchange pipeline adopts a finned tube structure, and the outer finned tube 8, the middle finned tube 9 and the inner finned tube 10 are uniformly arranged around the combustor 13 as the center according to different rays.

3. Condensatiewarmtewisselaar met roestvrijstalen lamellenbuis volgens conclusie 1, met het kenmerk, dat: het rookgasschot 3 zich bij een onderste deel van de verbrander bevindt.A stainless steel finned tube condensation heat exchanger according to claim 1, characterized in that : the flue gas baffle 3 is located at a lower part of the combustor.

4. Condensatiewarmtewisselaar met roestvrijstalen lamellenbuis volgens conclusie 1, met het kenmerk, dat: de buitenste lamellenbuis 8, de middelste lamellenbuis 9 en de binnenste lamellenbuis 10 verticaal verschaft zijn.The stainless steel finned tube condensation heat exchanger according to claim 1, characterized in that : the outer finned tube 8, the middle finned tube 9 and the inner finned tube 10 are arranged vertically.