Efficient enhanced heat exchange device based on flow guide fins

Abstract

The efficient enhanced heat exchange device comprises a main heat exchange mechanism, an auxiliary heat exchange mechanism and a flow guide fin heat exchange mechanism, the main heat exchange mechanism comprises a main heat exchange unit and a fluid channel assembly, the main heat exchange unit is installed in the fluid channel assembly, and the auxiliary heat exchange mechanism comprises an auxiliary heat exchange unit and water collecting equipment; the flow guide fin heat exchange mechanism comprises a flow guide fin assembly, the auxiliary heat exchange unit is installed on the flow guide fin assembly, and the flow guide fin assembly is installed in the fluid channel assembly. The heat exchanger has the beneficial effects that the heat exchange unit structure of a traditional tube fin structure is optimized in the mode that the heat exchange main tube and the auxiliary tube are cooperatively installed in cooperation with the flow guide fins, a flow field in the structure is reconstructed under the condition that the minimum section Reynolds number (flow velocity) is not increased, meanwhile, the heat exchange area in the structure is increased, and the heat exchange efficiency is improved. Therefore, the heat exchange performance of the heat exchange device is enhanced, and the utilization rate of flue gas waste heat is further improved.

Description

Technical Field

[0001] The invention belongs to the field of heat exchange devices, and in particular relates to a high-efficiency enhanced heat exchange device based on guide fins. Background Art

[0002] At present, more than 50% of my country's industrial energy consumption is converted into waste heat in the form of waste gas or wastewater, of which only 30% is reused; strengthening industrial waste heat recovery is an important technical path to improve terminal energy efficiency and reduce carbon emissions. Improving waste heat recovery efficiency has become the core path to achieve industrial energy conservation and consumption reduction. In the process of efficient recovery of flue gas waste heat in the fields of electricity, chemical industry, steel, metallurgy, etc., there are problems such as low efficiency, high power consumption, and short life caused by factors such as dust accumulation. It is urgent to introduce a new heat exchange structure to solve the above problems.

[0003] At present, in the field of heat exchange devices, bare tube structures, segmented fin tube structures, or spiral fin tube structures are often used as heat exchange structures. Although the bare tube structure has good anti-ash deposition performance, the heat transfer coefficient is small and the compactness is poor. In addition, there is generally a vortex low-speed zone on the leeward side of the bare tube structure, which affects the heat transfer efficiency and increases the resistance. Although the fin tube structure can enhance the flue gas heat exchange and improve the compactness of the equipment, it leads to a doubling of the pressure loss. The fan energy consumption accounts for as much as 35%-45% of the total system energy consumption, and the anti-ash deposition performance is poor, and the heat transfer resistance needs to be further improved. Ash deposition is prone to occur when the fins and the base tube are in a vertical state. Installing fins on the base tube significantly increases the flow rate at the minimum cross-section. This is the fundamental reason for the significant increase in resistance when enhancing heat exchange. Summary of the invention

[0004] The object of the present invention is to provide a high-efficiency enhanced heat exchange device based on guide fins to solve the above-mentioned problems.

[0005] In order to achieve the above object, the present invention provides a high-efficiency enhanced heat exchange device based on guide fins, comprising:

[0006] Main heat exchange mechanism: including a main heat exchange unit and a fluid channel assembly, wherein the main heat exchange unit is installed inside the fluid channel assembly;

[0007] Auxiliary heat exchange mechanism: comprising an auxiliary heat exchange unit and a water collection device, wherein the auxiliary heat exchange component is connected to the water collection device;

[0008] The guide fin heat exchange mechanism comprises a guide fin assembly, the auxiliary heat exchange unit is installed on the guide fin assembly, and the diameter of the auxiliary heat exchange unit is less than 60% of the diameter of the main heat exchange unit;

[0009] Gaps are arranged between the guide fin assemblies.

[0010] In one or more embodiments of the present invention, the fluid channel assembly includes guide fins, gaps are provided between the guide fins, and heat exchange rooms are provided between the plurality of guide fins.

[0011] In one or more embodiments of the present invention, the main heat exchange unit comprises a main base pipe, and the main base pipe is vertically placed inside the heat exchange room.

[0012] In one or more embodiments of the present invention, the main base pipe is installed between a pair of guide fins.

[0013] In one or more embodiments of the present invention, the guide fin assembly includes guide fins, the installation direction of the guide fins is the same as the installation direction of the main base tube, and a gap is provided between the guide fins and the main base tube.

[0014] In one or more embodiments of the present invention, the auxiliary heat exchange unit includes an auxiliary base tube and a connecting tube, a plurality of the auxiliary base tubes are installed on the guide fins, and the connecting tube is connected to the plurality of auxiliary base tubes.

[0015] In one or more embodiments of the present invention, the water collecting device comprises a water collecting device and a liquid inlet pipe, and the water collecting device and the liquid inlet pipe are connected.

[0016] In one or more embodiments of the present invention, a liquid inlet is provided on the auxiliary base tube, and the liquid inlet is communicated with the liquid inlet pipe.

[0017] In one or more embodiments of the present invention, the main base pipes are installed in a staggered manner inside the heat exchange room.

[0018] In one or more embodiments of the present invention, the installation positions of the auxiliary base tubes on the guide fins include symmetrical distribution and distribution on both sides.

[0019] Compared with the prior art, the beneficial effect of the present invention is that by using the method of collaborative installation of the heat exchange main pipe and the auxiliary pipe, the heat exchange unit structure of the traditional tube-fin structure is optimized in combination with the guide fins, and the flow field inside the structure is reconstructed without increasing the minimum cross-sectional Reynolds number (flow velocity) while increasing the heat exchange area inside the structure, thereby enhancing the heat exchange performance of the heat exchange device and further improving the utilization rate of the flue gas waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a high-efficiency enhanced heat exchange device based on guide fins in one embodiment of the present invention;

[0021] Figure 2 This is a first internal structure diagram of a high-efficiency enhanced heat exchange device based on guide fins in one embodiment of the present invention;

[0022] Figure 3 A second internal structure diagram of a high-efficiency enhanced heat exchange device based on guide fins in one embodiment of the present invention;

[0023] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the connection of guide fins of a high-efficiency enhanced heat exchange device based on guide fins in one embodiment of the present invention;

[0025] Figure 6 It is a cross-sectional schematic diagram of a high-efficiency enhanced heat exchange device based on guide fins in one embodiment of the present invention.

[0026] Description of main reference numerals:

[0027] 1-water collecting device, 101-connecting pipe, 102-liquid inlet pipe, 2-main base pipe, 4-auxiliary base pipe, 401-liquid inlet, 6-guide fins, 602-heat exchange room. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0029] refer to Figure 1-Figure 4 As shown, a high-efficiency enhanced heat exchange device based on guide fins is used to recover heat from waste gas or wastewater generated by industrial energy consumption, which is convenient for reducing production costs, improving waste heat recovery efficiency, and achieving industrial energy saving and consumption reduction. The traditional fin structure design is improved, the fin is separated from the traditional base tube, and a main base tube 2 and a secondary base tube 4 are added. On this basis, the fin is set to the guide plate shape of the traditional base tube, so that the guide fin 6 can be used as a guide plate of the main base tube 2 and a heat conducting plate of the secondary base tube 4. The cooperation of the main base tube 2 and the secondary base tube 4 realizes the double improvement of the heat exchange area and the heat exchange performance. In this process, the minimum cross-sectional flow velocity or Reynolds number does not increase, which has a significant effect of increasing heat and reducing drag.

[0030] A high-efficiency enhanced heat exchange device based on guide fins comprises: a main heat exchange mechanism, an auxiliary heat exchange mechanism and a guide fin heat exchange mechanism. The main heat exchange mechanism is used to directly apply industrial waste gas and wastewater to the corresponding base pipe for heat exchange. The auxiliary heat exchange mechanism realizes rapid heat transfer through a small pipe diameter and performs secondary recovery of the heat of the guide fins. The guide fin heat exchange mechanism is used to assist the main heat exchange mechanism and the auxiliary heat exchange mechanism, and can simultaneously serve as a guide plate of the main heat exchange mechanism and a heat conduction plate of the auxiliary heat exchange mechanism, and enhances the heat transfer effect by enhancing convection.

[0031] refer to Figure 1-Figure 4As shown, the main heat exchange mechanism includes a main heat exchange unit and a fluid channel assembly. The fluid channel assembly is used to accommodate waste gas and waste water generated by industrial energy consumption, and make them flow inside the channel to promote heat exchange. The fluid channel is a heat exchange room 602, which is composed of a plurality of guide fins 6. Through the guide space set in the gap between the guide fins 6, a plurality of heat exchange rooms 602 are superimposed and installed to form a kinetic energy flow as a whole. Waste gas and waste water are diverted therein, and the heat exchange mechanism is wrapped and flushed. The plurality of heat exchange rooms 602 can conduct heat to each other, so that the heat transfer efficiency of the heat exchange equipment combined with the guide fins 6 is further improved. The curved surfaces of the guide fins 6 are combined in pairs to nest the main base tube 2, and the main base tube 2 can be protected from corrosion while being fixed and conducting heat.

[0032] When the heat exchange gas flows through the heat exchange room 602, a variety of flow modes can be used, including horizontal flue gas flow and longitudinal flue gas flow. The flue gas to be heat exchanged flows along the guide fins 6 and fills the interior of the heat exchange room 602, forming a coating on the main base tube 2 for heat exchange, and at the same time, it is synergistically heat exchanged when flowing through the guide fins 6.

[0033] refer to Figure 1-Figure 4 As shown, the main heat exchange unit includes a main base tube 2, and the fluid domain box 3 nested in the main base tube 2 conducts heat to the inside of the main base tube 2 for heat exchange. The main base tube 2 is a staggered tube without fins, and a gravity heat pipe or a common serpentine heat exchange tube can be used. The main base tube 2 is nested in the space formed by the curved surface of the guide fin 6, and there is a gap between the outer wall of the main base tube 2 and the curved surface of the guide fin 6 that allows gas and liquid to pass quickly, thereby achieving an enhanced heat transfer function.

[0034] refer to Figure 1-Figure 4 As shown, the main base tube 2 is placed vertically inside the heat exchange room 602, which can effectively improve the anti-ash effect and reduce the accumulation of dust during operation, which causes the convective heat transfer efficiency to decrease. At the same time, the main base tube 2 nested in the fluid domain box 3 is not hindered by the fins when placed vertically, which is convenient for soot blowing and easy to clean. At the same time, the main base tube 2 is staggered and installed in the fluid domain box 3 in a staggered arrangement state. The staggered arrangement state can increase the gas-liquid flow rate in the heat exchange room 602 and improve the heat transfer coefficient. At the same time, the staggered arrangement state can greatly reduce the flue gas temperature on the windward and leeward sides of the heat exchange room 602, so that the wall temperature is controlled at plus or minus five degrees Celsius, which is conducive to improving the acid corrosion resistance. Comprehensively considering the arrangement and installation method of the main base tube 2 in the heat exchange room 602, the staggered vertical installation can reduce the ash accumulation rate, improve the efficiency of soot blowing, and improve the acid corrosion resistance, so that the maintenance and replacement cycle is extended by two to three years.

[0035] refer to Figure 2-Figure 5As shown, the auxiliary heat exchange mechanism includes an auxiliary heat exchange unit and a water collection device. The auxiliary heat exchange unit is used to cooperate with the guide fin 6 to achieve rapid heat exchange, and can cooperate with the main heat exchange mechanism to perform flow and heat exchange collaborative operations. The auxiliary heat exchange unit includes an auxiliary base tube 4 and a connecting pipe 101. The auxiliary base tube 4 is installed on the guide fin 6 and penetrates the guide fin 6. Liquid can flow in the auxiliary base tube 4. The connecting pipe 101 is connected to multiple auxiliary base tubes 4. The connecting pipe 101 connects the auxiliary base tubes 4 distributed on the guide fin 6 into a whole. At the same time, each auxiliary base tube 4 is connected, which can realize rapid heat exchange of all auxiliary base tubes 4 when liquid flows in the auxiliary base tube 4. On the basis of the fixed connection between the auxiliary base tube 4 and the guide fin 6, the guide fin 6 can also take away heat from the auxiliary base tube 4, so as to realize rapid heat exchange between the auxiliary base tube 4 and the guide fin 6.

[0036] refer to Figure 2-Figure 5 As shown, the water collection device is used to transport and store the liquid to be exchanged with heat, including a water collection device 1 and a liquid inlet pipe 102. The liquid to be exchanged with heat is stored and transported in the water collection device 1, and enters the liquid inlet pipe 102 through the liquid inlet pipe 102 connected to the water collection device 1. The liquid inlet pipe 102 cooperates with the liquid inlet 401 on the sub-base pipe 4 to send the liquid to be exchanged with heat into the sub-base pipe 4, and flows and circulates inside each sub-base pipe 4 under the action of the connecting pipe 101 connected to the sub-base pipe 4. In this process, heat is exchanged with the sub-base pipe 4 to transfer heat to the sub-base pipe 4. At the same time, the sub-base pipe 4 is fixedly connected to the guide fin 6. In the process of heat conduction of the sub-base pipe 4, heat further flows from the sub-base pipe 4 to the guide fin 6, and multiple guide fins 6 are synchronously and rapidly heated.

[0037] refer to Figure 2-Figure 5 As shown, the guide fins are used for synergistic heat exchange between the main heat exchange mechanism and the auxiliary heat exchange mechanism. Through synergistic action, synergistic heat exchange is carried out between the main heat exchange mechanism, the auxiliary heat exchange mechanism and the guide fin assembly. At the same time, synergistic heat exchange is further carried out between the guide fins 6 and the main base tube 2, and the gap area between them is a high-efficiency synergistic heat exchange area.

[0038] refer to Figure 2-Figure 5As shown, the guide fin heat exchange mechanism is used to assist the main heat exchange mechanism and the auxiliary heat exchange mechanism in heat exchange, and at the same time, it works as the guide plate of the main heat exchange mechanism and the heat conduction plate of the auxiliary heat exchange mechanism. The guide fin heat exchange mechanism includes a guide fin assembly, and the guide fin assembly includes a guide fin 6. The guide fin 6 is installed inside the heat exchange room 602 and divides the heat exchange room 602 into multiple parts, each of which is equipped with a different main heat exchange mechanism. The guide fin 6 separates the main base pipes 2 that are staggered up and down in the heat exchange room 602. The curved surface on the guide fin 6 surrounds one side of the main base pipe 2 and cooperates with the main base pipe 2 to separate the wastewater or waste gas flowing in the heat exchange room 602. In this process, the guide fin 6 works as a guide plate of the main base tube 2. The guide fin 6, as a guide plate in the heat exchange room 602, forces the waste water or waste gas to flow along the guide fin 6, and forces the waste water or waste gas to improve the adhesion of the flow near the main base tube 2, thereby improving the heat exchange performance. At the same time, the guide fin 6 also serves as a heat conduction plate of the auxiliary base tube 4. The heat in the heat exchange room 602 is exchanged with the auxiliary base tube 4 through the guide fin 6. The auxiliary base tube 4 is fixedly connected to the guide fin 6 and exchanges heat with the guide fin 6. The guide fin 6 synchronously cooperates with the auxiliary base tube 4 of the main base tube 2 to exchange heat.

[0039] refer to Figure 2-Figure 5 As shown, a pair of guide fins 6 cooperate to form a heat exchange room 602, and the main base tube 2 is installed inside the main base tube heat exchange room 602. There is a gap between the guide fins 6 and the outer wall of the main base tube 2, and the gap area between the guide fins 6 and the main base tube 2 is a high-efficiency collaborative heat exchange area. In this area, the main heat exchange mechanism and the auxiliary heat exchange mechanism can be synchronously exchanged. At the same time, the gap between the guide fins 6 and the main base tube 2 that enclose the main base tube 2 can force the gas or liquid flowing through to efficiently adhere to the guide fins 6 and the main base tube 2, thereby improving the regional heat exchange efficiency.

[0040] refer to Figure 5 As shown, the installation positions of the auxiliary base tubes 4 on the guide fins 6 include symmetrical distribution and distribution on both sides. The installation positions of the auxiliary base tubes 4 on two adjacent guide fins 6 are different, including symmetrical installation, left-leaning installation and right-leaning installation. The flow field in the heat exchange room 602 is actively controlled through different installation methods to form a flow field control and heat transfer synergistic unit.

[0041] refer to Figure 6 The guide fins 6 are described as having a uniform and regular wavy streamlined structure, the gap between the heat exchange portion on the guide fins 6 and the main base tube 2 is evenly distributed, the gap between the heat exchange portion on the guide fins 6 and the main base tube 2 is relatively evenly matched, the heat exchange portion on the guide fins 6 and the main base tubes 2 on both sides are matched, so that the guide fins 6 have a regular streamlined structure, and the gap between the guide fins 6 and the main base tube 2 further affects the power consumption of the heat exchanger.

[0042] refer to Figure 6 As shown, the fluid flow rate of the A section directly affects the power consumption of the heat exchanger. Compared with conventional finned tubes on the market, the guide fins 6 in the present invention are thinner and do not increase the fluid flow rate of the A section, which has a significant effect of reducing resistance and saving power. Compared with conventional finned tubes on the market, the presence of the auxiliary base tube 4 in the B section of the present invention reduces the shape resistance between the AB sections, has a certain drag reduction effect, further optimizes the effect of reducing resistance and saving power, and thus has more advantages in the power consumption of the heat exchanger.

[0043] The present invention can improve the flow field on the leeward side of the main base tube 2, improve the adhesion of the fluid on the leeward side, and improve its heat exchange performance; the guide fin 6 itself is also a heat exchange fin with a base tube, which greatly increases the heat exchange area; there is a good flow and heat exchange synergy between the two structures of the guide fin 6 and the main base tube 2, especially the heat exchange effect in the high-efficiency synergy area formed by the gap between the guide fin 6 and the main base tube 2 is better; the guide fin 6 greatly reduces the flue gas temperature difference between the windward and leeward sides of the main base tube 2 in the heat exchange room 602, which is beneficial to improving the acid corrosion resistance; the structure without fin installation on the main base tube 2 can be realized by using a gravity heat pipe or an ordinary serpentine heat exchange tube, and the main base tube 2 is placed vertically to achieve the effect of anti-ash accumulation, and it is easy to carry out soot blowing operations, which fundamentally overcomes the problem of difficulty in cleaning the main base tube 2.

[0044] During specific use, the waste gas or waste water of industrial energy consumption is introduced into the heat exchange room 602, and flows and circulates inside the heat exchange room 602. The main heat exchange mechanism nested inside the heat exchange room 602 exchanges heat with the heat exchange room 602 during this process. The heat exchange room 602 is also equipped with a guide fin 6 for separating the heat exchange room 602. The guide fin 6 is provided with an auxiliary heat exchange mechanism. The heat liquid to be exchanged that flows from the water collection device 1 into the auxiliary heat exchange mechanism is introduced into the auxiliary heat exchange mechanism through the connecting pipe 101, and exchanges heat with the auxiliary base pipe 4. In this process, the guide fin 6 serves as a guide plate of the main heat exchange mechanism and also as a heat conduction plate of the auxiliary heat exchange mechanism, synchronously performing cooperative heat exchange on the main base tube 2 and the auxiliary base tube 4. The curved surface setting of the guide fin 6 forms a high-efficiency heat exchange area with the main base tube 2, thereby improving the adhesion of the flow field in the area and the heat exchange efficiency. The heat exchange area and heat exchange efficiency are increased by redistributing the internal flow field of the heat exchange room 602. At the same time, the main and auxiliary heat exchange mechanisms and the guide fin heat exchange mechanism form a flow field control and heat transfer cooperative unit to improve the heat exchange effect.

[0045] Compared with the prior art, the beneficial effect of the present invention is that by using the method of collaborative installation of the heat exchange main pipe and the auxiliary pipe, the heat exchange unit structure of the traditional tube-fin structure is optimized in combination with the guide fins, and the flow field inside the structure is reconstructed without increasing the minimum cross-sectional Reynolds number (flow velocity) while increasing the heat exchange area inside the structure, thereby enhancing the heat exchange performance of the heat exchange device and further improving the utilization rate of the flue gas waste heat.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-efficiency enhanced heat exchange device based on guide fins, characterized in that: include: Main heat exchange mechanism: including a main heat exchange unit and a fluid channel assembly, wherein the main heat exchange unit is installed inside the fluid channel assembly; Auxiliary heat exchange mechanism: comprising an auxiliary heat exchange unit and a water collection device, wherein the auxiliary heat exchange component is connected to the water collection device; The guide fin heat exchange mechanism comprises a guide fin assembly, the auxiliary heat exchange unit is installed on the guide fin assembly, and the diameter of the auxiliary heat exchange unit is less than 60% of the diameter of the main heat exchange unit; Gaps are arranged between the guide fin assemblies.

2. The high-efficiency enhanced heat exchange device based on guide fins according to claim 1, characterized in that: The fluid channel assembly includes guide fins, gaps are arranged between the guide fins, and heat exchange rooms are arranged between the plurality of guide fins.

3. The high-efficiency enhanced heat exchange device based on guide fins according to claim 1, characterized in that: The main heat exchange unit comprises a main base pipe, and the main base pipe is vertically placed inside the heat exchange room.

4. The high-efficiency enhanced heat exchange device based on guide fins according to claim 1, characterized in that: The main base pipe is installed between a pair of guide fins.

5. The high-efficiency enhanced heat exchange device based on guide fins according to claim 1, characterized in that: The guide fin assembly comprises guide fins, the installation direction of the guide fins is the same as the installation direction of the main base tube, and a gap is arranged between the guide fins and the main base tube.

6. The high-efficiency enhanced heat exchange device based on guide fins according to claim 1, characterized in that: The auxiliary heat exchange unit comprises an auxiliary base tube and a connecting tube. A plurality of the auxiliary base tubes are installed on the guide fins, and the connecting tube is connected to the plurality of auxiliary base tubes.

7. The high-efficiency enhanced heat exchange device based on guide fins according to claim 1, characterized in that: The water collecting equipment comprises a water collecting device and a liquid inlet pipe, and the water collecting device is communicated with the liquid inlet pipe.

8. The high-efficiency enhanced heat exchange device based on guide fins according to claim 7, characterized in that: The auxiliary base tube is provided with a liquid inlet, and the liquid inlet is communicated with the liquid inlet pipe.

9. The high-efficiency enhanced heat exchange device based on guide fins according to claim 3, characterized in that: The main base pipes are installed in a staggered manner inside the heat exchange room.

10. The high-efficiency enhanced heat exchange device based on guide fins according to claim 6, characterized in that: The installation positions of the auxiliary base tubes on the guide fins include symmetrical distribution and distribution on both sides.

Images