Fluoroplastic steel low-temperature flue heat exchanger

Abstract

The fluoroplastic steel low-temperature flue heat exchanger comprises a shell, a first fluoroplastic steel U-shaped heat exchange tube bundle and a second fluoroplastic steel U-shaped heat exchange tube bundle, the left end and the right end of the shell are connected with a flue gas inlet tube and a flue gas outlet tube respectively, and access holes are formed in the surfaces of the flue gas inlet tube and the flue gas outlet tube respectively. A grating is installed in the flue gas inlet pipe, the pipe axes of the second fluoroplastic steel U-shaped heat exchange pipe bundles are perpendicular to the conveying direction of flue gas and are arranged in multiple layers, the second fluoroplastic steel U-shaped heat exchange pipe bundles and the first fluoroplastic steel U-shaped heat exchange pipe bundles are arranged in a staggered mode, and the fluoroplastic steel pipe bundles have the self-cleaning performance. According to the fluoroplastic steel low-temperature flue heat exchanger, dirt on a tube bundle can be automatically cleaned under the action of slight vibration and medium flow velocity during operation of the heat exchanger, long-term stability of a heat transfer coefficient is kept, and by recycling waste heat in flue gas, the fluoroplastic steel low-temperature flue heat exchanger can improve the energy utilization efficiency and reduce energy consumption and waste.

Description

Technical Field

[0001] The utility model relates to the technical field of flue waste heat recovery, in particular to a fluorine plastic steel low-temperature flue heat exchanger. Background Technique

[0002] In the process of industrial production, a large amount of waste heat is often carried in the flue gas during the emission process. If directly discharged, it will not only cause energy waste, but also may have an adverse impact on the environment, such as aggravating the greenhouse effect. Therefore, the recovery and utilization of flue gas waste heat has become an important research direction. Recycling this waste heat can be converted into useful energy, such as electricity or heat energy, thereby improving energy utilization efficiency and reducing production costs.

[0003] In the related technology, a bare tube economizer is often installed on the flue to recover waste heat. The bare tube economizer is made of steel. In the flue gas environment, the bare tube economizer is easily affected by corrosion and ash accumulation. Corrosion will lead to a decline in material performance and even failure, increasing maintenance costs and safety risks. Ash accumulation will affect the heat exchange efficiency of the heat exchanger and reduce the heat transfer performance. In addition, the bare tube economizer is prone to fouling, which affects the heat energy recovery efficiency and requires regular maintenance and cleaning. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fluorine plastic steel low-temperature flue heat exchanger to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a fluorine plastic steel low-temperature flue heat exchanger, including a shell, the left and right ends of the shell are respectively connected with a flue gas inlet pipe and a flue gas outlet pipe, and inspection openings are arranged on the surfaces of the flue gas inlet pipe and the flue gas outlet pipe, which is convenient for cleaning the first fluorine plastic steel U-shaped heat exchange tube bundle and the second fluorine plastic steel U-shaped heat exchange tube bundle to maintain high heat exchange efficiency. A grille is installed inside the flue gas inlet pipe, and the grille preliminarily filters large particulate matters in the flue gas to avoid the heat exchanger from being impacted;

[0006] The first fluorine plastic steel U-shaped heat exchange tube bundle, the first fluorine plastic steel U-shaped heat exchange tube bundle is installed inside the shell and arranged in several upper and lower layers;

[0007] The second fluorine plastic steel U-shaped heat exchange tube bundle, the second fluorine plastic steel U-shaped heat exchange tube bundle is installed inside the shell, and the tube axis of the second fluorine plastic steel U-shaped heat exchange tube bundle is perpendicular to the transmission direction of the flue gas and arranged in several layers. The second fluorine plastic steel U-shaped heat exchange tube bundle is arranged in a staggered manner with the first fluorine plastic steel U-shaped heat exchange tube bundle and is arranged closely to achieve the maximum heat exchange area and improve the heat exchange efficiency;

[0008] An ash hopper, the ash hopper is installed on the lower surface of the shell and is used to discharge solid particulate matters in the shell. The ash hopper is provided with a detachable ash discharge door for easy cleaning.

[0009] Furthermore, expansion joints are installed on both the flue gas inlet pipe and the flue gas outlet pipe, which are used to absorb the thermal expansion or contraction of the flue and the heat exchanger caused by temperature changes or mechanical vibrations, thereby protecting the flue and the heat exchanger from thermal stress damage.

[0010] Furthermore, the upper and lower ends of the first fluoroplastics steel U-shaped heat exchange tube bundle are respectively connected with a water inlet head and a water outlet head. The water inlet head and the water outlet head are filled with desalted water, and the desalted water is used to absorb the heat of the flue gas. The two ends of the second fluoroplastics steel U-shaped heat exchange tube bundle are connected with a water inlet and a water outlet, and the water inlet and the water outlet are filled with desalted water, with higher heat exchange efficiency.

[0011] Furthermore, a first temperature sensor is installed on the flue gas inlet pipe, and a second temperature sensor is installed on the flue gas outlet pipe, which are used to detect the temperature of the flue gas entering and leaving the heat exchanger. A pressure gauge is installed on the first fluoroplastics steel U-shaped heat exchange tube bundle, which is used to detect the pressure change of the fluid inside the heat exchanger in real time.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] (1) The first fluoroplastics steel U-shaped heat exchange tube bundle and the first fluoroplastics steel U-shaped heat exchange tube bundle hardly react with strong acids and strong alkalis. This characteristic makes it unnecessary to worry about low-temperature acid corrosion problems during the operation of the heat exchanger, thus greatly extending the service life of the heat exchanger. In contrast, traditional metal materials are prone to corrosion problems in a corrosive environment, affecting the performance and life of the heat exchanger.

[0014] (2) The heat transfer area to volume ratio of fluoroplastics steel is very high, about 10 to 20 times that of the metal heat exchanger tube, and its overall heat transfer coefficient can reach about 2 times that of the metal heat exchange tube. This characteristic enables the fluoroplastics steel low-temperature flue heat exchanger to have a larger heat transfer area under the same volume, improving the heat exchange efficiency.

[0015] (3) The fluoroplastics steel tube bundle has self-cleaning performance and can clean the dirt on the tube bundle by slight vibration and the action of the medium flow rate during the operation of the heat exchanger, maintaining the long-term stability of the heat transfer coefficient. In contrast, the tube bundle wall of the metal heat exchanger is prone to generating dirt and cannot self-clean, resulting in a gradual decrease in the heat transfer coefficient and a deterioration of the heat exchange effect after long-term use.

[0016] (4) The fluoroplastics steel low-temperature flue heat exchanger uses desalted water as the cold source. Compared with the conventional indirect heat exchange white plume treatment technology route, it does not need to add a cooling tower and a circulation pipeline, greatly reducing the system complexity and investment cost.

[0017] (5) By recovering the waste heat in the flue gas, the fluorine plastic steel low-temperature flue heat exchanger can improve the energy utilization efficiency, reduce energy consumption and waste; the convenient maintenance port design facilitates daily maintenance and repair, reducing the operating cost; the application of the expansion joint effectively solves the thermal stress problem caused by temperature changes, improving the reliability and safety of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view of the present utility model;

[0019] Figure 2 is the top view of the present utility model;

[0020] Figure 3 is the schematic diagram of the connection between the flue gas inlet pipe and the grille of the present utility model;

[0021] Figure 4 is the schematic diagram of the reducer of the flue gas inlet pipe of the present utility model;

[0022] Figure 5 is the schematic diagram of the connection between the flue gas outlet pipe and the support grid of the present utility model;

[0023] Figure 6 is the schematic diagram of the reducer of the flue gas outlet pipe of the present utility model.

[0024] In the figure: 1, water inlet; 2, water outlet; 3, flue gas inlet pipe; 4, flue gas outlet pipe; 5, expansion joint; 6, grille; 7, flange; 8, tube sheet; 9, first fluorine plastic steel U-shaped heat exchange tube bundle; 10, second fluorine plastic steel U-shaped heat exchange tube bundle; 11, shell; 12, second temperature sensor; 13, maintenance port; 14, ash hopper; 15, pressure gauge; 16, first temperature sensor; 17, water inlet head; 18, water outlet head; 19, support rod; 20, support grid. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Embodiment:

[0027] Please refer to Figure 1-6, the present utility model provides a technical solution: a fluoroplastics steel low-temperature flue gas heat exchanger, including a housing 11. The left and right ends of the housing 11 are respectively connected with a flue gas inlet pipe 3 and a flue gas outlet pipe 4, and inspection openings 13 are provided on the surfaces of the flue gas inlet pipe 3 and the flue gas outlet pipe 4. A grille 6 is installed inside the flue gas inlet pipe 3 for initially filtering large particles in the flue gas to protect the first fluoroplastics steel U-shaped heat exchange tube bundle 9 and the second fluoroplastics steel U-shaped heat exchange tube bundle 10 from direct impact;

[0028] The first fluoroplastics steel U-shaped heat exchange tube bundle 9, and the first fluoroplastics steel U-shaped heat exchange tube bundle 9 is installed inside the housing 11 and arranged in several upper and lower layers;

[0029] The second fluoroplastics steel U-shaped heat exchange tube bundle 10, and the second fluoroplastics steel U-shaped heat exchange tube bundle 10 is installed inside the housing 11, and the tube axis of the second fluoroplastics steel U-shaped heat exchange tube bundle 10 is perpendicular to the transmission direction of the flue gas and arranged in several layers. The second fluoroplastics steel U-shaped heat exchange tube bundle 10 and the first fluoroplastics steel U-shaped heat exchange tube bundle 9 are arranged in a staggered manner to form a complex heat exchange network. This design can increase the contact area between the flue gas and the first fluoroplastics steel U-shaped heat exchange tube bundle 9 and the second fluoroplastics steel U-shaped heat exchange tube bundle 10, thereby reducing energy consumption and improving heat exchange efficiency;

[0030] The fluoroplastics steel low-temperature flue gas heat exchanger uses a special fluoroplastics steel material, which has excellent thermal conductivity and thermal stability and can maintain high heat exchange efficiency in a low-temperature environment. By optimizing the heat exchanger structure design and flow channel layout, the thermal resistance is further reduced, and the efficiency and speed of heat transfer are improved, thereby significantly enhancing the performance of the entire heat exchange system;

[0031] By improving the heat exchange efficiency, the fluoroplastics steel low-temperature flue gas heat exchanger can effectively recover and utilize the heat energy in the flue gas, reducing energy waste. At the same time, the optimized heat exchange process also helps to reduce the emission of harmful substances in the flue gas, meeting the dual requirements of modern industry for environmental protection and energy conservation;

[0032] Fluoroplastics steel has the characteristics of corrosion resistance, wear resistance, strong rigidity, smooth surface, and not easy to accumulate ash. Fluoroplastics steel is beneficial to improving the heat exchange capacity, reducing the heat exchange area, and the fluoroplastics steel heat exchanger is also very suitable for low-temperature corrosive flue gas environments;

[0033] The ash hopper 14, and the ash hopper 14 is installed on the lower surface of the housing 11 to collect and discharge the solid particles in the flue gas, preventing blockage and wear of the heat exchange tube bundle. A detachable ash discharge door is provided at the bottom of the ash hopper 14 for easy cleaning.

[0034] In this embodiment, as Figure 1As shown, expansion joints 5 are installed on both the flue gas inlet pipe 3 and the flue gas outlet pipe 4, which are used to absorb the thermal expansion or contraction of the flue and the heat exchanger caused by temperature changes or mechanical vibrations, and protect the flue and the heat exchanger from thermal stress damage.

[0035] In this embodiment, as Figure 5 shown, a support grid 20 is installed inside the flue gas outlet pipe 4 to keep the flue gas outlet pipe 4 from deforming easily, with high support strength, and to prevent the flue gas outlet pipe 4 from being stepped on and damaged.

[0036] In this embodiment, as Figure 1 and Figure 2 shown, the upper and lower ends of the first fluorine plastic steel U-shaped heat exchange tube bundle 9 are respectively connected with a water inlet head 17 and a water outlet head 18, the two ends of the second fluorine plastic steel U-shaped heat exchange tube bundle 10 are connected with a water inlet 1 and a water outlet 2, tube plates 8 are respectively connected to the first fluorine plastic steel U-shaped heat exchange tube bundle 9 and the second fluorine plastic steel U-shaped heat exchange tube bundle 10, the water inlet 1 and the water inlet head 17 share the same tube plate 8 to supply demineralized water, the water outlet head 18 and the water outlet 2 share the same tube plate 8 to discharge the heat-absorbed demineralized water, realizing the recovery of heat energy, and the tube plate 8 is provided with a flange 7 to facilitate connection with external pipelines.

[0037] In this embodiment, as Figure 1 shown, a first temperature sensor 16 is installed on the flue gas inlet pipe 3, and a second temperature sensor 12 is installed on the flue gas outlet pipe 4, which are used to detect the temperature of the flue gas entering and leaving the heat exchanger. A pressure gauge 15 is installed on the first fluorine plastic steel U-shaped heat exchange tube bundle 9 to detect the pressure change of the flue gas inside the heat exchanger in real time.

[0038] In this embodiment, as Figure 2 shown, support rods 19 are installed between the water inlet 1 and the water outlet 2 and the housing 11 to improve the connection stability between the water inlet 1 and the water outlet 2 and the housing 11.

[0039] Specifically, during use, the smoke pipe is connected to the flue gas inlet pipe 3, demineralized water is provided for the water inlet 1 and the water inlet head 17 through the tube plate 8, the demineralized water flows along the first fluorine plastic steel U-shaped heat exchange tube bundle 9 and the second fluorine plastic steel U-shaped heat exchange tube bundle 10. When the flue gas flows through the housing 11, the heat of the flue gas is absorbed by the first fluorine plastic steel U-shaped heat exchange tube bundle 9 and the second fluorine plastic steel U-shaped heat exchange tube bundle 10 and transferred to the demineralized water. The temperature of the demineralized water gradually rises, while the temperature of the flue gas decreases accordingly. The demineralized water is discharged from the water outlet 2 and the water outlet head 18 for recycling. The fluorine plastic steel material has excellent corrosion resistance and can operate stably in the flue gas environment for a long time, reducing the performance degradation and failure risk caused by corrosion. Due to its good anti-fouling performance, the fluorine plastic steel material can reduce the influence of fouling on the heat exchange efficiency and maintain a high heat exchange performance.

[0040] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluoroplastic steel low-temperature flue heat exchanger, characterized in that: include: A shell (11), wherein the left and right ends of the shell (11) are respectively connected to a smoke inlet pipe (3) and a smoke outlet pipe (4), and the surfaces of the smoke inlet pipe (3) and the smoke outlet pipe (4) are both provided with inspection openings (13), and a grille (6) is installed inside the smoke inlet pipe (3); A first fluoroplastic steel U-shaped heat exchange tube bundle (9), wherein the first fluoroplastic steel U-shaped heat exchange tube bundle (9) is installed inside the shell (11) and is provided in a plurality of upper and lower layers; A second fluoroplastic steel U-shaped heat exchange tube bundle (10), wherein the second fluoroplastic steel U-shaped heat exchange tube bundle (10) is installed inside the shell (11), and the tube axis of the second fluoroplastic steel U-shaped heat exchange tube bundle (10) is arranged perpendicular to the transmission direction of the flue gas and is arranged in a plurality of layers, and the second fluoroplastic steel U-shaped heat exchange tube bundle (10) and the first fluoroplastic steel U-shaped heat exchange tube bundle (9) are arranged in an alternating manner; An ash hopper (14) is installed on the lower surface of the shell (11) and is used to discharge solid particles in the shell (11).

2. A fluoroplastic steel low-temperature flue heat exchanger according to claim 1, characterized in that: The smoke inlet pipe (3) and the smoke outlet pipe (4) are both equipped with expansion joints (5).

3. The fluoroplastic steel low-temperature flue heat exchanger according to claim 1 is characterized in that: A supporting grid (20) is installed inside the smoke outlet pipe (4).

4. The fluoroplastic steel low-temperature flue heat exchanger according to claim 1 is characterized in that: The upper and lower ends of the first fluoroplastic steel U-shaped heat exchange tube bundle (9) are respectively connected to a water inlet pipe head (17) and a water outlet pipe head (18), and the two ends of the second fluoroplastic steel U-shaped heat exchange tube bundle (10) are connected to a water inlet (1) and a water outlet (2).

5. The fluoroplastic steel low-temperature flue heat exchanger according to claim 1 is characterized in that: The smoke inlet pipe (3) is installed with a first temperature sensor (16), and the smoke outlet pipe (4) is installed with a second temperature sensor (12).

6. The fluoroplastic steel low-temperature flue heat exchanger according to claim 1, characterized in that: A pressure gauge (15) is installed on the first fluoroplastic steel U-shaped heat exchange tube bundle (9).

7. The fluoroplastic steel low-temperature flue heat exchanger according to claim 1 is characterized in that: The first fluoroplastic steel U-shaped heat exchange tube bundle (9) and the second fluoroplastic steel U-shaped heat exchange tube bundle (10) are respectively connected to tube sheets (8), and the tube sheets (8) are provided with flanges (7).

8. The fluoroplastic steel low-temperature flue heat exchanger according to claim 4 is characterized in that: A support rod (19) is installed between the water inlet (1), the water outlet (2) and the housing (11).

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