Finned tube heat exchanger for boiler flue gases

Abstract

This utility model discloses a finned tube heat exchanger for boiler flue gas, belonging to the field of thermal energy engineering and power engineering technology. Flue gas finned tube one and flue gas finned tube two are connected vertically by fin fixing components. Each flue gas finned tube one and flue gas finned tube two is covered with a heat exchange box, with cooling components distributed inside the heat exchange box. An exhaust component is installed at the lower end of each flue gas finned tube one and flue gas finned tube two. This application achieves a separate structure for the flue gas finned tube one and flue gas finned tube two from the heat exchange box, effectively avoiding the large temperature difference caused by the circulating heat exchange operation of the flue gas finned tube one and flue gas finned tube two installed in the heat exchange box, as well as the problems of easy corrosion and high replacement costs due to long-term immersion. The heat exchange box has an E-type structure with a three-section chamber design, effectively avoiding the problem of uneven heat exchange caused by the different cooling effects of the inner and outer ends of the flue gas finned tube one and flue gas finned tube two, and the problem of burns caused by the high temperature of the exhaust gas.

Description

Technical Field

[0001] This utility model relates to a tube heat exchanger, and more particularly to a finned tube heat exchanger for boiler flue gas, belonging to the field of thermal energy engineering and power engineering technology. Background Technology

[0002] For example, application number 202021094332.8 is the closest prior art. The prior art sets up a bidirectional ventilation duct, a bidirectional connecting duct, an insulated heat exchange box, and a pressure-sensitive chimney interface. During the operation of the device, L-shaped sealing baffles and sealing heat-conducting baffles are used to separate the internal chambers of the ventilation duct body and the bidirectional connecting duct into two connected independent chambers. Then, the four independent chambers are paired and connected to form two gas transmission pipelines. The boiler body is then connected to the flue gas filter through the two gas transmission pipelines. In the prior art, the fins of the heat exchange structure are distributed in the heat exchange box, which makes the fins easy to corrode, and the replacement cost is high. In addition, the fins are inconvenient to install and disassemble.

[0003] Therefore, a finned tube heat exchanger for boiler flue gas is needed to improve upon the above-mentioned shortcomings. Utility Model Content

[0004] The main purpose of this utility model is to provide a finned tube heat exchanger for boiler flue gas.

[0005] The objective of this utility model can be achieved by adopting the following technical solution:

[0006] A finned tube heat exchanger for boiler flue gas includes a boiler cover body for installation, wherein a first flue gas finned tube is fixed in the upper inner layer of the boiler cover body, and a second flue gas finned tube is installed in the lower inner layer of the boiler cover body.

[0007] The flue gas finned tube one and the flue gas finned tube two are connected by splicing the upper and lower parts of the finned tube. The flue gas finned tube one and the flue gas finned tube two are respectively covered with heat exchange boxes. The heat exchange boxes are wrapped around the outside of the flue gas finned tube one and the flue gas finned tube two at intervals. The heat exchange boxes are distributed with refrigeration components inside.

[0008] The lower ends of the flue gas finned tube one and the flue gas finned tube two are equipped with air extraction components.

[0009] The two heat exchange boxes are connected to inlet and outlet liquid assemblies, and the upper ends of the flue gas finned tube one and flue gas finned tube two are connected to filter assemblies.

[0010] Preferably, the heat exchange box has an E-type structure, with two sets of heat exchange boxes installed opposite each other. A liquid storage chamber is provided inside the heat exchange box, and the refrigeration component is installed inside the liquid storage chamber.

[0011] Preferably, the liquid inlet and outlet assembly includes a liquid inlet and a liquid outlet, with a liquid inlet on one side of the heat exchange box and a liquid outlet on the other side of the heat exchange box.

[0012] Preferably, the filter assembly includes a filter element and a filter layer. The filter element is installed at the upper end of flue gas finned tube one and flue gas finned tube two, and the filter layer is placed inside the filter element.

[0013] Preferably, a limiting bracket is installed on the air extraction component, and an exhaust fan is installed on the limiting bracket.

[0014] Preferably, the fixing end of the fin fixing member has a C-shaped structure, and the two fin fixing members are an integral structure.

[0015] The beneficial technical effects of this utility model are as follows:

[0016] This utility model provides a finned tube heat exchanger for boiler flue gas.

[0017] 1) Place the boiler cover on top of the boiler, seal the filter, and start the exhaust system to extract the flue gas generated inside the boiler. The exhaust fan inside the exhaust system rotates and extracts the flue gas, which then enters the flue gas finned tube 1 and flue gas finned tube 2. The inner walls of flue gas finned tube 1 and flue gas finned tube 2 are smooth to prevent the accumulation of flue gas particles, which would make cleaning difficult or result in poor heat exchange accuracy due to thick inner walls. Flue gas finned tube 1 and flue gas finned tube 2 are fixed by fin fixing components. When the flue gas finned tube 1 and flue gas finned tube 2 vibrate, deformation is reduced, improving equipment lifespan. This facilitates disassembly and maintenance, greatly reducing costs. The curved distribution structure of flue gas finned tube 1 and flue gas finned tube 2 increases the contact area with the heat exchange box, improving heat exchange efficiency and accuracy.

[0018] While the exhaust system is activated to extract flue gas from the boiler, the refrigeration system in the heat exchange box is activated to cool the refrigerant inside the heat exchange box. The refrigerant cools the heat exchange box, and the flue gas is cooled at the locations where the flue gas finned tubes 1 and 2 are enclosed by the heat exchange box. The cooled flue gas is then discharged through the flue gas finned tubes 1 and 2. This application achieves a separate structure between the flue gas finned tubes 1 and 2 and the heat exchange box, effectively avoiding the large temperature difference caused by the circulating heat exchange operation of the flue gas finned tubes 1 and 2 installed in the heat exchange box, as well as the problems of easy corrosion and high replacement costs caused by long-term immersion.

[0019] 2) The heat exchange box has an E-type structure and adopts a three-section chamber design. The upper and lower sets are symmetrically distributed on the outer side of the middle section of flue gas finned tube 1 and flue gas finned tube 2. The heat exchange box wraps the middle section of flue gas finned tube 1 and flue gas finned tube 2 in sections. The heat exchange box cools the flue gas exiting from flue gas finned tube 1 and flue gas finned tube 2 for heat exchange treatment. The heat exchange box has an upper and lower two-section structure, which effectively avoids the problem of uneven heat exchange caused by the different cooling effects of the inner and outer ends of flue gas finned tube 1 and flue gas finned tube 2, and the problem of burns caused by the high temperature of the exited flue gas.

[0020] 3) After the boiler cover is installed, the flue gas is guided through flue gas finned tubes one and two. After the flue gas is guided, it is heat exchanged through a heat exchange box. The flue gas after heat exchange is discharged to the filter element through flue gas finned tubes one and two. The filter element is divided into three layers: bottom layer, middle layer and surface layer. From bottom to top, the filter element is divided into three layers: coarse filter layer, transition layer and fine filter layer. The discharged flue gas is filtered through the filter layer in the filter element, which effectively avoids the problem of flue gas polluting the air. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a preferred embodiment of a finned tube heat exchanger for boiler flue gas according to the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of a preferred embodiment of a finned tube heat exchanger for boiler flue gas according to the present invention.

[0023] Figure 3 This is a schematic diagram of the inlet and outlet gas heat exchange structure of a preferred embodiment of a finned tube heat exchanger for boiler flue gas according to the present invention.

[0024] Figure 4 This is a side view of the inlet and outlet air heat exchange structure of a preferred embodiment of a finned tube heat exchanger for boiler flue gas according to the present invention.

[0025] Figure 5 This is a schematic diagram of the flue gas filtration structure of a preferred embodiment of a finned tube heat exchanger for boiler flue gas according to the present invention.

[0026] Figure 6 This is a schematic diagram of the flue gas extraction structure of a preferred embodiment of a finned tube heat exchanger for boiler flue gas according to the present invention.

[0027] In the picture: 1. Boiler cover body;

[0028] 2. Flue gas finned tube one; 201. Flue gas finned tube two; 202. Fin fixing component;

[0029] 3. Exhaust components; 301. Limit bracket; 302. Exhaust fan;

[0030] 4. Heat exchanger; 401. Liquid inlet; 402. Liquid outlet; 403. Liquid storage chamber; 404. Refrigeration components;

[0031] 5. Filter element; 501. Filter layer. Detailed Implementation

[0032] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0033] Example 1

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes a finned tube heat exchanger for boiler flue gas, including a boiler cover body 1 for installation, a flue gas finned tube 2 fixed in the upper inner layer of the boiler cover body 1, and a flue gas finned tube 201 installed in the lower inner layer of the boiler cover body 1.

[0035] The flue gas finned tube 1 2 and the flue gas finned tube 2 201 are connected by splicing the upper and lower parts of the finned tube 202. The flue gas finned tube 1 2 and the flue gas finned tube 2 201 are respectively covered with heat exchange boxes 4. The heat exchange boxes 4 are spaced around the outside of the flue gas finned tube 1 2 and the flue gas finned tube 2 201. Cooling components 404 are distributed inside the heat exchange boxes 4.

[0036] Furthermore, an exhaust component 3 is installed at the lower end of the flue gas finned tube 1 2 and the flue gas finned tube 201;

[0037] like Figure 1 and Figure 2As shown, the boiler cover body 1 is placed on top of the boiler, the filter is sealed, and the exhaust unit 3 is activated to extract the flue gas generated inside the boiler. The exhaust fan 302 inside the exhaust unit 3 rotates and extracts the gas. An explosion-proof membrane is installed at the connection section between the exhaust unit 3 and the finned tube. When the flue gas pressure suddenly rises above 0.1 MPa, it automatically ruptures to release pressure, triggering an audible and visual alarm and cutting off the power to the exhaust motor. The extracted flue gas enters the flue gas finned tube 1 2 and the flue gas finned tube 2 201. The exhaust unit 3 is wrapped with a partition layer to effectively prevent the flue gas finned tube 1 2 and the flue gas finned tube 2 201 from becoming clogged. The inner walls of finned tube 1 (2) and flue gas finned tube 2 (201) are smooth to prevent the accumulation of micro-particles in the flue gas, which could lead to difficulties in cleaning or poor heat exchange accuracy due to thicker inner walls. The flue gas finned tube 1 (2) and flue gas finned tube 2 (201) are fixed by fin fasteners 202. When the flue gas finned tube 1 (2) and flue gas finned tube 2 (201) vibrate, they will also reduce deformation and improve the service life of the equipment. They are easy to disassemble and maintain, which greatly reduces costs. The curved distribution structure of the flue gas finned tube 1 (2) and flue gas finned tube 2 (201) increases the contact area with the heat exchange box 4, which improves the efficiency and accuracy of heat exchange.

[0038] like Figure 4 As shown, while the exhaust unit 3 is activated to extract the flue gas from the boiler, the refrigeration unit 404 in the heat exchange box 4 is activated to cool the refrigerant in the heat exchange box 4. The refrigerant cools the heat exchange box 4. The flue gas is cooled at the location where the flue gas finned tube 1 2 and the flue gas finned tube 2 201 are enclosed by the heat exchange box 4. The cooled flue gas is then discharged through the flue gas finned tube 1 2 and the flue gas finned tube 2 201. A liquid storage chamber is set at the bottom of the heat exchange box 4. The refrigerant after absorbing heat is transported to an external air cooler by a circulating pump to form a closed loop. This application realizes that the flue gas finned tube 1 2 and the flue gas finned tube 2 201 are separated from the heat exchange box 4, which effectively avoids the large temperature difference caused by the flue gas finned tube 1 2 and the flue gas finned tube 2 201 being installed in the heat exchange box 4 for circulating heat exchange, and the problems of easy corrosion and high replacement cost caused by long-term immersion.

[0039] Example 2

[0040] The solution in Example 1 will be further described below with reference to its specific working method.

[0041] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, in a preferred embodiment, based on the above method, the heat exchange box 4 is further designed as an E-type structure with a three-section chamber design. The upper and lower sets are symmetrically distributed on the outer side of the middle section of the flue gas finned tube 1 2 and the flue gas finned tube 2 201. The heat exchange box 4 wraps the middle section of the flue gas finned tube 1 2 and the flue gas finned tube 2 201 in sections. The flue gas discharged from the flue gas finned tube 1 2 and the flue gas finned tube 2 201 is heat exchanged through the cooling of the heat exchange box 4. The heat exchange box 4 has an upper and lower two-section structure, which effectively avoids the problem of uneven heat exchange caused by the different cooling effects of the inner and outer ends of the flue gas finned tube 1 2 and the flue gas finned tube 2 201 and the problem of burns caused by the high temperature of the discharged flue gas. The flue gas finned tube 1 2 and the flue gas finned tube 2 201 have a multi-section distributed flow guiding structure, which effectively increases the heat exchange area between the flue gas finned tube 1 2 and the flue gas finned tube 2 201 and the heat exchange box 4.

[0042] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in a preferred embodiment, based on the above method, two sets of heat exchange boxes with independent circulation loops are installed in the middle section of the flue gas finned tube 1 2 and flue gas finned tube 2 201. They are equipped with frequency conversion liquid pumps and electromagnetic flow valves. Platinum resistance temperature sensors are installed at the inlet section of each chamber to monitor the temperature of the outer wall of the flue gas finned tube in real time. When the temperature difference between the inner and outer finned tubes is detected to be too high, the control system automatically adjusts the coolant flow rate of the corresponding flow channel to achieve dynamic thermal balance by increasing the coolant flow rate in the low temperature region.

[0043] Example 3

[0044] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0045] like Figure 3 , Figure 4 and Figure 5 As shown, in a preferred embodiment, based on the above method, further, filter elements 5 are respectively installed at the upper ends of the flue gas finned tube 1 2 and the flue gas finned tube 201, and a filter layer 501 is laid inside the filter element 5.

[0046] After the boiler cover body 1 is installed, the flue gas is guided through the flue gas finned tube 1 2 and the flue gas finned tube 2 201. After the flue gas is guided, the flue gas finned tube 1 2 and the flue gas finned tube 2 201 exchange heat through the heat exchange box 4. The flue gas after heat exchange in the heat exchange box 4 is discharged to the filter element 5 through the flue gas finned tube 1 2 and the flue gas finned tube 2 201. The filter element 5 is divided into: bottom layer, middle layer and surface layer. The filter element 5 is divided into: coarse filter layer, transition layer and fine filter layer from bottom to top. The discharged flue gas is filtered through the filter layer 501 in the filter element 5.

[0047] like Figure 4 As shown, in a preferred embodiment, based on the above method, the connection end of the filter element 5 with the flue gas finned tube 1 2 and the flue gas finned tube 2 201 is further designed as a tapered mating surface, and static sealing is achieved by an O-ring. Nano-lignin adsorption units are embedded in the filter layer 501, which adsorb gaseous pollutants such as SO2 and NOx by utilizing their porous structure. At the same time, harmful organic compounds such as formaldehyde are decomposed by catalytic decomposition through surface hydroxyl groups. This material can operate stably below 600℃ and can be naturally degraded after disposal, avoiding secondary pollution. Filtering the flue gas exported from the boiler effectively avoids the problem of flue gas polluting the air.

[0048] like Figure 5 As shown, in a preferred embodiment, based on the above method, a pulse jet device is further integrated on the top of the filter layer 501. The pressure difference is monitored in real time by a pressure sensor. When the resistance exceeds the standard, the back-blowing program is automatically started, and the filter layer is swept in reverse by compressed air to remove dust. The filter layer 501 inside the filter element 5 is a replaceable structure, which effectively improves the accuracy of flue gas filtration. The filter element 5 is wrapped with a separation layer to effectively prevent burns or blockages.

[0049] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A finned tube heat exchanger for boiler flue gas, comprising a boiler cover body (1) for installation, wherein a first flue gas finned tube (2) is fixed in the upper inner layer of the boiler cover body (1), and a second flue gas finned tube (201) is installed in the lower inner layer of the boiler cover body (1). Its features are: The flue gas finned tube one (2) and the flue gas finned tube two (201) are connected by fin fixing parts (202) splicing from top to bottom. The flue gas finned tube one (2) and the flue gas finned tube two (201) are respectively covered with heat exchange boxes (4). The heat exchange boxes (4) are spaced around the outside of the flue gas finned tube one (2) and the flue gas finned tube two (201). The heat exchange boxes (4) are distributed with cooling components (404) inside. The lower ends of the flue gas finned tube one (2) and the flue gas finned tube two (201) are equipped with exhaust components (3); Two sets of heat exchange boxes (4) are connected to inlet and outlet liquid components, and the upper ends of the flue gas finned tube one (2) and flue gas finned tube two (201) are connected to filter components.

2. A finned tube heat exchanger for use in a boiler flue gas according to claim 1, characterized in that: The heat exchange box (4) has an E-type structure, and two sets of heat exchange boxes (4) are installed opposite each other. A liquid storage chamber (403) is opened in the heat exchange box (4), and the refrigeration component (404) is installed in the liquid storage chamber (403).

3. A finned tube heat exchanger for use in a boiler flue gas according to claim 2, characterized in that: The liquid inlet and outlet assembly includes a liquid inlet (401) and a liquid outlet (402). The liquid inlet (401) is provided on one side of the heat exchange box (4), and the liquid outlet (402) is provided on the other side of the heat exchange box (4).

4. A finned tube heat exchanger for use in a boiler flue gas according to claim 1, characterized in that: The filter assembly includes a filter element (5) and a filter layer (501). The filter element (5) is installed at the upper end of flue gas finned tube one (2) and flue gas finned tube two (201). The filter layer (501) is placed inside the filter element (5).

5. A finned tube heat exchanger for use in a boiler flue gas according to claim 2, characterized in that: A limit frame (301) is installed on the exhaust component (3), and an exhaust fan (302) is installed on the limit frame (301).

6. A finned tube heat exchanger for boiler flue gas according to claim 1, characterized in that: The fixing end of the fin fastener (202) is a C-shaped structure, and the two fin fasteners (202) are an integral structure.

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