Flue gas waste heat utilization heat exchanger

Abstract

The utility model relates to the technical field of flue gas waste heat utilization, in particular to a heat exchanger for flue gas waste heat utilization, which comprises a cylindrical flue, a square heat exchanger main body arranged in the cylindrical flue, and a heat exchange core body formed by a plurality of stainless steel pipes which are arranged in parallel and two ends of which are fixed through pipe plates, the outer surface of the stainless steel pipe is fixedly provided with hydrophilic foil fins with the fin spacing being 2 mm and the thickness being 0.115 mm through a water expansion technology, the circulating water path is connected with a water inlet and a water outlet of the stainless steel pipe, the stainless steel water tank is arranged below the heat exchange core body, and the stainless steel water tank is used for collecting condensate water and directly discharging the condensate water through a water outlet. The heat exchanger is of a square structure, the stainless steel pipe heat exchange core is contained in the heat exchanger, the hydrophilic foil fins are arranged, the whole heat exchanger is placed in the cylindrical flue, and heat recovery of industrial flue gas is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas waste heat utilization technology, specifically relating to a heat exchanger structure for recovering and processing waste heat generated in industrial production processes. Background Technology

[0002] Industrial production and energy conversion processes generate large amounts of industrial flue gas. This high-temperature flue gas is usually released directly into the atmosphere, causing not only a huge waste of thermal energy and exacerbating energy consumption, but also thermal pollution and greenhouse gas emissions.

[0003] Current common flue gas waste heat recovery technologies, such as traditional shell-and-tube heat exchangers, suffer from problems such as large size, low heat exchange efficiency, easy ash accumulation, and high maintenance costs. Therefore, there is a need for a flue gas waste heat recovery heat exchanger that is compact, has high heat exchange efficiency, and is easy to maintain. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a heat exchanger for the utilization of waste heat from flue gas, so as to achieve effective cooling and waste heat recovery of industrial flue gas.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heat exchanger for utilizing waste heat from flue gas, comprising a cylindrical flue, a square heat exchanger body disposed inside the cylindrical flue, and a heat exchange core composed of multiple parallel stainless steel tubes fixed at both ends by tube sheets. The outer surface of the stainless steel tubes is fixedly fitted with hydrophilic foil fins with a fin spacing of 2 mm and a thickness of 0.115 mm using a water expansion process. The device also includes a circulating water path connecting the inlet and outlet of the stainless steel tubes, and a stainless steel water tank disposed below the heat exchange core. The stainless steel water tank is used to collect condensate and discharge it directly through a drain outlet.

[0006] Preferably, the hydrophilic foil fins are arranged in a staggered pattern.

[0007] Preferably, the stainless steel tubes are arranged in a straight or staggered manner.

[0008] Preferably, the stainless steel water tank is made of 304 stainless steel.

[0009] Preferably, the circulating water circuit includes a circulating pump for driving water flow to circulate within the stainless steel pipe.

[0010] Preferably, the tube sheet is a rectangular steel plate, which is welded and fixed to the inner wall of the cylindrical flue.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. High-efficiency heat exchange: The design of hydrophilic foil fins improves heat exchange efficiency and effectively reduces the temperature of flue gas.

[0013] 2. Energy saving and environmental protection: It recovers and utilizes the waste heat in the flue gas, reduces energy waste, and reduces the thermal pollution and greenhouse gas emissions from flue gas emissions, which meets the environmental protection requirements of energy saving and emission reduction.

[0014] 3. High durability: The heat exchanger body is made of stainless steel tubes, which has good corrosion resistance and durability and can adapt to the complex working conditions of industrial flue gas environment.

[0015] 4. Compact structure: The square structure and compact core design make the equipment small in size, easy to install and arrange, and save space.

[0016] 5. Wide applicability: It is suitable for waste heat recovery systems of flue gas generated in various industrial production processes, and has broad application prospects. It can be used in many industries such as steel, metallurgy, chemical, and power. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the heat exchanger structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the hydrophilic foil fin structure of this utility model;

[0019] Figure 3 This is a schematic diagram illustrating the principle of flue gas waste heat utilization in this utility model.

[0020] In the diagram: 1. Cylindrical flue; 2. Circulating water system; 3. Stainless steel pipe; 4. Stainless steel water tank; 5. Hydrophilic foil fins; 6. Tube sheet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.

[0022] The following reference Figures 1-3 This application describes a heat exchanger for utilizing waste heat from flue gas, provided in one embodiment.

[0023] A heat exchanger for utilizing waste heat from flue gas includes a cylindrical flue 1, a square heat exchanger body disposed inside the cylindrical flue 1, and a heat exchange core composed of multiple parallel stainless steel tubes 3 fixed at both ends by tube sheets 6. The square structure and compact core design make the equipment small in size, easy to install and arrange, and space-saving. The heat exchanger body is made of stainless steel tubes, which have good corrosion resistance and durability and can adapt to the complex working conditions of industrial flue gas environment. The square heat exchanger is nested inside the cylindrical flue 1, reducing the external space occupation. The rectangular tube sheet 6 welded to the inner wall of the flue fixes the position of the heat exchange tubes. The outer surface of the stainless steel tubes 3 is fixed with hydrophilic foil fins 5 with a fin spacing of 2 mm and a thickness of 0.115 mm by a water expansion process. It also includes a circulating water circuit 2 connecting the inlet and outlet of the stainless steel tubes 3, and a stainless steel water tank 4 disposed below the heat exchange core. The stainless steel water tank 4 is used to collect condensate and discharge it directly through the drain outlet.

[0024] Furthermore, the hydrophilic foil fins 5 are arranged in a staggered manner with an arrangement parameter of 55×47.63. The staggered arrangement of the fins extends the flue gas flow path, while the corrugated structure increases the turbulence intensity and improves the heat exchange efficiency.

[0025] Furthermore, the stainless steel pipes 3 are arranged in either a straight or staggered pattern.

[0026] Furthermore, the stainless steel water tank 4 is made of 304 stainless steel, which is beneficial for resisting corrosion from acidic components in flue gas.

[0027] In a further embodiment, the circulating water path 2 includes a circulating pump for driving water flow to circulate within the stainless steel pipe 3.

[0028] In a further embodiment, the tube sheet 6 is a rectangular steel plate, which is welded and fixed to the inner wall of the cylindrical flue 1.

[0029] The specific working process of a heat exchanger for utilizing flue gas waste heat according to this application will be described in conjunction with the above embodiments:

[0030] 1. Flue Gas Flow and Heat Release: Industrial flue gas enters through the cylindrical flue 1 inlet and flows over the outer surface of the hydrophilic foil fins 5 inside the square heat exchanger body. Heat in the flue gas is transferred through the following mechanisms:

[0031] Sensible heat transfer: High-temperature flue gas and circulating water in stainless steel pipe 3 exchange heat through convection through the pipe wall.

[0032] Latent heat recovery: Water vapor in the flue gas condenses on the surface of the hydrophilic foil fin 5, releasing latent heat of phase change. The heat is transferred to the circulating water in the stainless steel tube 3 through the fin.

[0033] 2. Circulating water heat absorption and flow: The circulating pump drives water to flow through the circulating water path 2 into the stainless steel pipe 3. The water flow direction forms a countercurrent or crossflow with the flue gas flow direction. After absorbing the sensible heat and latent heat of the flue gas, the temperature of the circulating water rises and it returns to the external system (such as the boiler feedwater preheating pipeline) through the outlet.

[0034] 3. Condensate Collection and Discharge: Water droplets condensed in the flue gas flow downwards along the surface of the hydrophilic foil fins 5 and collect in the stainless steel water tank 4 at the bottom. The 38L water tank design ensures that after temporary storage, the condensate is directly discharged from the system through the drain outlet, avoiding liquid accumulation and corrosion.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A heat exchanger for flue gas waste heat utilization, characterized in that: The device includes a cylindrical flue (1), a square heat exchanger body located inside the cylindrical flue (1), and a heat exchange core consisting of multiple parallel stainless steel tubes (3) fixed at both ends by tube sheets (6). The outer surface of the stainless steel tubes (3) is fixed with hydrophilic foil fins (5) with a fin spacing of 2 mm and a thickness of 0.115 mm by a water expansion process. The device also includes a circulating water path (2) connecting the inlet and outlet of the stainless steel tubes (3), and a stainless steel water tank (4) located below the heat exchange core. The stainless steel water tank (4) is used to collect condensate and discharge it directly through the drain outlet.

2. The heat exchanger for flue gas waste heat utilization according to claim 1, characterized in that: The hydrophilic foil fins (5) are arranged in a staggered pattern.

3. The heat exchanger for flue gas waste heat utilization according to claim 1, characterized in that: The stainless steel pipes (3) are arranged in either a straight or staggered manner.

4. The heat exchanger for flue gas waste heat utilization according to claim 1, characterized in that: The stainless steel water tank (4) is made of 304 stainless steel.

5. The heat exchanger for flue gas waste heat utilization according to claim 1, characterized in that: The circulating water path (2) includes a circulating pump for driving water to circulate within the stainless steel pipe (3).

6. The heat exchanger for flue gas waste heat utilization according to claim 1, characterized in that: The tube sheet (6) is a rectangular steel plate, which is welded and fixed to the inner wall of the cylindrical flue (1).

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