A finned tube heat exchanger

Abstract

The application discloses a finned tube heat exchanger, which comprises a combustion chamber provided with a combustion inner cavity; a first connecting pipe is arranged on the combustion chamber and communicates with the combustion inner cavity; the combustion chamber is used for generating heat gas which is delivered to the combustion inner cavity; a heat exchange structure comprises at least two first heat exchange tubes and at least two second heat exchange tubes; the first heat exchange tubes and the second heat exchange tubes are arranged in a cross mode; at least one first fin is arranged on the first heat exchange tube and protrudes from the first heat exchange tube towards the second heat exchange tube; at least two second fins are arranged on the second heat exchange tube; a smoke baffle is connected to the inner wall of the combustion chamber; the smoke baffle is used for guiding the heat gas to the first heat exchange tube and the second heat exchange tube. The technical scheme of the application can improve the heat absorption amount, the heat exchange efficiency and the heat transfer efficiency.

Description

Technical Field

[0001] This invention relates to the field of boiler heating technology, and specifically to a finned tube heat exchanger. Background Technology

[0002] A steam boiler system refers to boiler equipment that produces steam. Steam boilers operate at higher combustion temperatures, resulting in flue gas temperatures significantly higher than conventional boilers, typically exceeding 200°C. Consequently, the latent heat of water vapor in the flue gas is not fully utilized. Steam boiler systems include finned heat exchangers; however, existing finned heat exchangers have insufficient heat transfer efficiency, allowing some of the gas to release heat, leading to heat loss and reduced heat exchange efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide a finned tube heat exchanger that aims to increase the amount of heat absorbed and improve heat exchange efficiency.

[0004] The above-mentioned problems to be solved by the present invention are achieved through the following technical solutions:

[0005] A finned tube heat exchanger, comprising:

[0006] A combustion chamber is provided with a combustion cavity; a first connecting pipe is provided on the combustion chamber, the first connecting pipe is connected to the combustion cavity, and the first connecting pipe is used to connect to a burner, the burner is used to generate hot gas and the hot gas is delivered to the combustion cavity;

[0007] A heat exchange structure includes at least two first heat exchange tubes and at least two second heat exchange tubes; the first heat exchange tubes and the second heat exchange tubes are arranged intersectingly; the first heat exchange tubes are provided with at least one first fin, which protrudes from the first heat exchange tube toward the second heat exchange tube; the second heat exchange tubes are provided with at least two second fins, which protrude from the second heat exchange tube toward the first heat exchange tube.

[0008] A smoke baffle is connected to the inner wall of the combustion chamber; the smoke baffle is used to guide the hot gas to the first heat exchange tube and the second heat exchange tube.

[0009] Preferably, the smoke baffle includes a straight smoke baffle portion and a convex smoke baffle portion; the convex smoke baffle portion is disposed at the side end of the convex smoke baffle portion; and the convex smoke baffle portion is disposed from the body of the combustion chamber toward the combustion cavity, and the convex smoke baffle portion is used to guide the hot gas to the first heat exchange tube and the second heat exchange tube.

[0010] Preferably, at least three first fins are selected and are obliquely arranged on the outer side wall of the first heat exchange tube; and a first gap is provided between two adjacent first fins.

[0011] The second fins are selected in at least three and are obliquely arranged on the outer side wall of the second heat exchange tube; and a second gap is provided between two adjacent second fins;

[0012] Furthermore, one end of the first fin is disposed within the second gap, and the second fin is disposed within the first gap.

[0013] Preferably, at least three first heat exchange tubes and at least three second heat exchange tubes are selected; and the first heat exchange tubes and the second heat exchange tubes are arranged in a staggered ring along the circumferential direction of the combustion chamber.

[0014] Preferably, both the interior of the first heat exchange tube and the interior of the second heat exchange tube are provided with a first inner cavity, and the first inner cavity is used to transport the heat exchange medium; the first inner cavity is provided with a spiral separator and an inner conveying frame, and the spiral separator is located above the inner conveying frame; the inner conveying frame is provided with at least two second inner cavities, and the second inner cavities are respectively connected to the first inner cavity and the outside of the combustion chamber.

[0015] Preferably, the spiral separator includes a supporting inner frame and spiral side fins, the supporting inner frame being connected within the first inner cavity; the spiral side fins are arranged around the outer surface of the supporting inner frame and are used to transport the heat exchange medium.

[0016] Preferably, the combustion chamber is provided with at least two boiler connecting pipes, the output end of which is connected to the first heat exchange pipe or the second heat exchange pipe; and a first flow equalization plate is provided inside the boiler connecting pipe; and / or, the combustion chamber is provided with at least two first discharge pipes, the input end of which is connected to the first heat exchange pipe or the second heat exchange pipe; and a second flow equalization plate is provided inside the first discharge pipe.

[0017] Preferably, the combustion chamber includes an inner cylinder and an outer cylinder; the inner cylinder is disposed inside the outer cylinder, and a placement cavity is formed between the inner cylinder and the outer cylinder, the placement cavity being used to place a liquid medium; the combustion cavity is located inside the inner cylinder.

[0018] Preferably, the outer cylinder is equipped with a liquid level sensor and an outer cylinder temperature sensor. The outer cylinder temperature sensor is used to detect the temperature of the placement cavity; the liquid level sensor is used to detect the liquid level of the liquid medium.

[0019] Preferably, the outer cylinder is further provided with an inner cylinder inlet pipe and an inner cylinder outlet pipe, and the inner cylinder outlet pipe is located above the inner cylinder inlet pipe, and a booster pump is provided between the inner cylinder inlet pipe and the inner cylinder outlet pipe.

[0020] Beneficial effects: The technical solution of the present invention uses a smoke baffle to block and change the transport trajectory of the transported hot gas, guiding the hot gas to the first and second heat exchange tubes, thereby increasing the heat exchange capacity and improving the heat exchange efficiency; and by using the cross arrangement of the first and second fins of the first and second heat exchange tubes, the contact area between the hot gas and the first and second fins can be increased, thereby increasing the heat absorption, improving the heat exchange efficiency, and thus improving the heat transfer efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an embodiment of a finned tube heat exchanger according to the present invention.

[0023] Figure 2 This is a partial cross-sectional view of an embodiment of a finned tube heat exchanger according to the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of a smoke baffle plate according to an embodiment of a finned tube heat exchanger of the present invention.

[0025] Figure 4 This is an enlarged view of the heat exchange structure of an embodiment of a finned tube heat exchanger according to the present invention.

[0026] Figure 5 This is an enlarged view of the first or second heat exchange tube of an embodiment of a finned tube heat exchanger according to the present invention.

[0027] Figure 6 This is a schematic diagram of an embodiment of a finned tube heat exchanger according to the present invention.

[0028] Figure 7 This is a top view of an embodiment of a finned tube heat exchanger according to the present invention.

[0029] Reference numerals: 1-Combustion chamber; 101-Inner cylinder; 102-Outer cylinder; 12-Boiler connecting pipe; 121-First flow equalization plate; 14-Combustion chamber discharge pipe; 15-First connecting pipe; 103-Combustion inner cavity; 17-First discharge pipe; 171-Second flow equalization plate; 181-Inner cylinder input pipe; 182-Inner cylinder output pipe; 19-Liquid level sensor; 51-Outer cylinder temperature sensor; 52-Inner cylinder temperature sensor; 2-Heat exchange structure; 21-First heat exchange tube; 202-First fin; 22-Second heat exchange tube; 204-Second fin; 201-First inner cavity; 202-Inner conveyor frame; 221-Second inner cavity; 23-Supporting inner frame; 231-Helical side fin; 3-Smoke baffle; 31-Smoke baffle straight section; 32-Smoke baffle convex arc section. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] This invention proposes a finned tube heat exchanger.

[0034] like Figure 1-4 As shown, in one embodiment of the present invention, the finned tube heat exchanger includes:

[0035] Combustion chamber 1, wherein the combustion chamber 1 is provided with a combustion cavity 103; the combustion chamber 1 is provided with a first connecting pipe 15, the first connecting pipe 15 is connected to the combustion cavity 103, and the first connecting pipe 15 is used to connect with a burner, wherein the burner is used to generate hot gas and the hot gas is transported to the combustion cavity 103.

[0036] The heat exchange structure 2 includes at least two first heat exchange tubes 21 and at least two second heat exchange tubes 22; the first heat exchange tubes 21 and the second heat exchange tubes 22 are arranged intersectingly; the first heat exchange tubes 21 are provided with at least one first fin 202, the first fin 202 protruding from the first heat exchange tubes 21 toward the second heat exchange tubes 22; the second heat exchange tubes 22 are provided with at least two second fins 204, the second fins 204 protruding from the second heat exchange tubes 22 toward the first heat exchange tubes 21;

[0037] A smoke baffle 3 is connected to the inner wall of the combustion chamber 1; the smoke baffle 3 is used to guide the hot gas to the first heat exchange tube 21 and the second heat exchange tube 22.

[0038] The technical solution of this invention uses a smoke baffle to block and change the transport trajectory of the incoming hot gas, guiding the hot gas to the first and second heat exchange tubes, thereby increasing the heat exchange capacity and improving the heat exchange efficiency. Furthermore, by using the cross arrangement of the first and second fins of the first and second heat exchange tubes, the contact area between the hot gas and the first and second fins can be increased, thereby increasing the heat absorption, improving the heat exchange efficiency, and ultimately improving the heat transfer efficiency.

[0039] A burner is a general term for a device that mixes and combusts fuel and air in a specific manner. Burners can include gas burners; gas burners are mainly classified into two types: natural gas burners and blast furnace gas burners. Large-capacity natural gas burners mostly employ a multi-nozzle, horizontal-flow design. The natural gas nozzles are placed within the air passage of the air conditioner. Metal fiber surface burners can be selected as the burner; these are low-NOx burners, requiring NOx emissions to be less than 30 mg / Nm3.

[0040] Specifically, in some implementations, such as Figure 2 and 3As shown, the smoke baffle 3 includes a straight smoke-blocking portion 31 and a convex smoke-blocking portion 32. The convex smoke-blocking portion 32 is disposed at both ends of the smoke-blocking portion 32. The convex smoke-blocking portion 32 is disposed from the body of the combustion chamber 1 toward the combustion cavity 103. The convex smoke-blocking portion 32 is used to guide the hot gas to the first heat exchange tube 21 and the second heat exchange tube 22. The convex smoke-blocking portion 32 is selected as an annular convex smoke-blocking portion or at least two convex smoke-blocking portions. The smoke-blocking portion blocks the hot gas, causing it to move to both sides and flow back along the convex smoke-blocking portion 32 toward the first heat exchange tube 21 and the second heat exchange tube 22, thereby forming a vortex that repeatedly scours the first heat exchange tube 21 and the second heat exchange tube 22, improving the heat exchange capacity and heat exchange efficiency.

[0041] Specifically, in some implementations, such as Figure 4 As shown, at least three first fins 202 are selected and obliquely disposed on the outer side wall of the first heat exchange tube 21; and a first gap is provided between two adjacent first fins 202; at least three second fins 204 are selected and obliquely disposed on the outer side wall of the second heat exchange tube 22; and a second gap is provided between two adjacent second fins 204; and one end of the first fin 202 is disposed in the second gap, and the second fin 204 is disposed in the first gap.

[0042] Specifically, in some embodiments, at least three first heat exchange tubes 21 and at least three second heat exchange tubes 22 are selected; and the first heat exchange tubes 21 and the second heat exchange tubes 22 are arranged in a staggered, annular pattern along the circumferential direction of the combustion chamber 1. That is, the first heat exchange tubes 21 and the second heat exchange tubes 22 form an alternating, annular heat exchange structure 2, wherein the annulus can be a circular ring, a square ring, or other irregular ring shape. The alternating arrangement of the first heat exchange tubes 21 and the second heat exchange tubes 22 enables highly efficient alternating heat exchange technology, improving heat exchange efficiency.

[0043] In some embodiments, the first fin 202 is selected as a first annular fin; the second fin 204 is selected as a second annular fin.

[0044] After the structure generates and transports the heat gas, it flows towards the baffle plate. Then, the baffle plate rebounds and guides the heat to the first heat exchange tube 21 and the second heat exchange tube 22, forming a vortex that repeatedly washes the transport trajectory of the finned tube, thereby enhancing the heat exchange efficiency and improving the heat transfer efficiency.

[0045] Specifically, in some implementations, such as Figure 1 , 4As shown in Figure 5, both the interior of the first heat exchange tube 21 and the interior of the second heat exchange tube 22 are provided with a first inner cavity 201, and the first inner cavity 201 is used to transport the heat exchange medium; the first inner cavity 201 is provided with a spiral separator and an inner conveying frame 202, and the spiral separator is located above the inner conveying frame 202. The inner conveying frame 202 is provided with at least two second inner cavities 221, and the second inner cavities 221 are respectively connected to the first inner cavity 201 and the outside of the combustion chamber 1.

[0046] In some implementation methods, such as Figure 4 and 5 As shown, the spiral separator includes a supporting inner frame 23 and spiral side fins 231. The supporting inner frame 23 is connected within the first inner cavity 201. The spiral side fins 231 are arranged around the outer surface of the supporting inner frame 23 and are used to transport the heat exchange medium. The spiral side fins 231 extend the transport trajectory of the heat exchange medium, improve the heat exchange capacity, and ensure heat exchange efficiency.

[0047] After the hot gas transfers heat to the first and second heat exchange tubes, the heat is absorbed by the heat exchange medium inside the tubes, and then transferred again by the flowing heat exchange medium, improving heat exchange efficiency. Furthermore, the sleeves of the first and second heat exchange tubes can deoxygenate the liquid medium. That is, the sleeves of the first and second heat exchange tubes can absorb the heat from the high-temperature gas after the first heat exchange, raising the temperature of the liquid medium, and also causing dissolved oxygen in the liquid medium to precipitate at high temperatures, preventing oxygen corrosion of the inner wall of the heat exchange tubes. In addition, by separately placing the spiral separators in their respective first and second heat exchange tubes 21 and 22, multiple separations of steam and water can be achieved in a dispersed manner, ensuring that the output steam reaches a slightly superheated state. This solves the problem of low steam separation volume and slow speed in traditional single-position steam-water separation methods.

[0048] Specifically, in some implementations, such as Figure 1 and 6 As shown, the combustion chamber 1 is provided with at least two boiler connecting pipes 12, the output end of the boiler connecting pipe 12 is connected to the first heat exchange pipe 21 or the second heat exchange pipe 22; and a first flow equalization plate 121 is provided inside the boiler connecting pipe 12.

[0049] Specifically, in some implementations, such as Figure 1 and 6 As shown, the combustion chamber 1 is provided with at least two first discharge pipes 17, the input end of the first discharge pipe 17 is connected to the first heat exchange pipe 21 or the second heat exchange pipe 22; and a second flow equalization plate 171 is provided inside the first discharge pipe 17.

[0050] In some embodiments, both the second flow equalization plate 171 and the first flow equalization plate 121 are cylindrical flow equalization plates, and the cylindrical flow equalization plates are provided with at least two flow equalization channels to improve the uniformity of medium (gas or liquid) flow.

[0051] Specifically, in some implementations, such as Figure 1 and 6 As shown, the combustion chamber 1 includes an inner cylinder 101 and an outer cylinder 102; the inner cylinder 101 is disposed inside the outer cylinder 102, and a placement cavity is formed between the inner cylinder 101 and the outer cylinder 102, the placement cavity being used to place a liquid medium; the combustion cavity 103 is located inside the inner cylinder 101. The inner and outer cylinders reduce the amount of heat diffusing outwards and increase the heat exchange rate.

[0052] Specifically, such as Figure 7 As shown, the outer cylinder 102 is equipped with a liquid level sensor 19 and an outer cylinder temperature sensor 51. The outer cylinder temperature sensor 51 is used to detect the temperature of the placement cavity; the liquid level sensor 19 is used to detect the liquid level of the liquid medium. By detecting the liquid level in the outer cylinder, the heated surface of the part radiated by the flame in the combustion cavity can be reliably cooled, thereby avoiding dry burning. Dry burning refers to the heating of operating components without liquid, such as heating a pot without adding water.

[0053] Specifically, such as Figure 7 As shown, an inner cylinder temperature sensor 52 is installed on the inner cylinder 101, which is used to detect the temperature value of the combustion chamber 103. The inner cylinder 101 also has a combustion chamber exhaust pipe 14, which is connected to the combustion chamber 103 and is equipped with a control valve. By using the inner cylinder temperature sensor 52 to monitor the temperature value of the combustion chamber in real time, accidents caused by excessive temperature can be avoided. Furthermore, opening the combustion chamber exhaust pipe 14 achieves appropriate cooling, improving operational safety.

[0054] Specifically, such as Figure 6 As shown, the outer cylinder 102 is also provided with an inner cylinder inlet pipe 181 and an inner cylinder outlet pipe 182, and the inner cylinder outlet pipe 182 is located above the inner cylinder inlet pipe 181. A booster pump is provided between the inner cylinder inlet pipe 181 and the inner cylinder outlet pipe 182. The booster pump can increase the flow circulation of the liquid medium and improve the heat exchange.

[0055] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A finned tube heat exchanger, characterized by, The application relates to a heat exchange structure of a boiler, which comprises the following parts: a combustion chamber, which is provided with a combustion cavity; a first connecting pipe is arranged on the combustion chamber and communicates with the combustion cavity, and the first connecting pipe is used for communicating with a burner, which is used for generating heat gas and delivering the heat gas to the combustion cavity; a heat exchange structure, which comprises at least two first heat exchange pipes and at least two second heat exchange pipes; the first heat exchange pipes and the second heat exchange pipes are arranged in a cross mode; at least one first fin is arranged on the first heat exchange pipe and protrudes from the first heat exchange pipe towards the second heat exchange pipe; at least two second fins are arranged on the second heat exchange pipe and protrude from the second heat exchange pipe towards the first heat exchange pipe; a smoke baffle, which is connected to the inner wall of the combustion chamber; the smoke baffle is used for guiding the heat gas to the first heat exchange pipe and the second heat exchange pipe; the smoke baffle comprises a straight smoke baffle part and a convex arc smoke baffle part; the convex arc smoke baffle part is arranged at the side end of the straight smoke baffle part and is arranged from the body of the combustion chamber towards the combustion cavity, and the convex arc smoke baffle part is used for guiding the heat gas to the first heat exchange pipe and the second heat exchange pipe; the interior of the first heat exchange pipe and the interior of the second heat exchange pipe are provided with a first cavity, and the first cavity is used for delivering a heat exchange medium; a spiral separation body and an inner conveying frame are arranged in the first cavity, the spiral separation body is arranged above the inner conveying frame, the inner conveying frame is provided with at least two second cavities, and the second cavities respectively communicate with the first cavity and the outside of the combustion chamber; the spiral separation body comprises a supporting inner frame and a spiral side fin, the supporting inner frame is connected to the first cavity, and the spiral side fin is arranged on the outer surface of the supporting inner frame and is used for delivering the heat exchange medium.

2. The finned tube heat exchanger according to claim 1, wherein the first fin is selected from at least three and is arranged on the outer side wall of the first heat exchange pipe in an inclined mode; and a first gap is arranged between two adjacent first fins; the second fin is selected from at least three and is arranged on the outer side wall of the second heat exchange pipe in an inclined mode; and a second gap is arranged between two adjacent second fins; and one end of the first fin is arranged in the second gap, and the second fin is arranged in the first gap.

3. The finned tube heat exchanger according to claim 1, wherein the first heat exchange pipe is selected from at least three, the second heat exchange pipe is selected from at least three; and the first heat exchange pipe and the second heat exchange pipe are arranged in a ring mode along the circumferential direction of the combustion chamber.

4. The finned tube heat exchanger according to claim 1, wherein at least two boiler connecting pipes are arranged on the combustion chamber, the output end of the boiler connecting pipe communicates with the first heat exchange pipe or the second heat exchange pipe; and a first flow uniformizing plate is arranged in the boiler connecting pipe; and / or at least two first discharge pipes are arranged on the combustion chamber, the input end of the first discharge pipe communicates with the first heat exchange pipe or the second heat exchange pipe; and a second flow uniformizing plate is arranged in the first discharge pipe.

5. The finned tube heat exchanger according to claim 1, wherein The combustion chamber comprises an inner cylinder and an outer cylinder; the inner cylinder is arranged inside the outer cylinder, and a placement inner cavity for placing a liquid medium is formed between the inner cylinder and the outer cylinder; and a combustion inner cavity is located inside the inner cylinder.

6. The finned tube heat exchanger according to claim 5, wherein The outer cylinder is provided with a liquid level sensor and an outer cylinder temperature sensor; the outer cylinder temperature sensor is used for detecting the temperature of the placement inner cavity; and the liquid level sensor is used for detecting the liquid level value of the liquid medium.

7. The finned tube heat exchanger according to claim 5, wherein The outer cylinder is further provided with an inner cylinder input pipe and an inner cylinder output pipe, and the inner cylinder output pipe is located above the inner cylinder input pipe; and a booster pump is arranged between the inner cylinder input pipe and the inner cylinder output pipe.

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