Waste heat recovery device in flue gas desulfurization

Abstract

This invention relates to a waste heat recovery device for flue gas desulfurization, specifically in the field of waste heat recovery technology. The device includes a waste heat recovery shell with coaxially rotatable chambers on their inner walls. Several heat exchange tubes are evenly distributed and fixed between the opposite ends of the two chambers, and the inner cavities of the heat exchange tubes communicate with the two chambers. One chamber has an inlet cylinder fixedly attached, and the other has an outlet cylinder fixedly attached. A scraper is fixedly connected between the outer rings of the two chambers, and the scraper makes frictional contact with the inner wall of the waste heat recovery shell. A flue gas outlet is located on the bottom surface of the waste heat recovery shell, and a filter screen is fixedly attached inside the outlet. The scraper makes frictional contact with the upper surface of the filter screen. This invention solves the problem in existing waste heat recovery devices where the contact area with flue gas is limited, resulting in insufficient recovery and utilization of waste heat and reduced waste heat recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to a waste heat recovery device in flue gas desulfurization. Background Technology

[0002] When a boiler is burning coal, the various organic and inorganic sulfur compounds in the coal are converted into sulfur oxides, mainly sulfur dioxide. Sulfur dioxide enters the atmosphere and combines with water to form acid rain, which not only has a serious impact on ground buildings and crops, but also harms human health. Therefore, flue gas desulfurization is an important part of environmental protection.

[0003] Currently, the most commonly used alkaline substances for flue gas desulfurization are limestone, quicklime, and hydrated lime. These alkaline substances react with SO2 in the flue gas to achieve desulfurization. However, in existing technologies, spray towers do not have waste heat recovery capabilities, making it impossible to recover and utilize the heat carried in the flue gas, thus wasting resources.

[0004] A prior art patent with publication number CN217737243U discloses a solution including: a tank, an air inlet, an air pump, a connecting pipe, a connecting plate, a spray head, an air outlet, an activated carbon filter, a heat exchange pipe, a water inlet, and a water outlet. To address the problems of existing spray towers lacking waste heat recovery capabilities, thus failing to recover and utilize the heat carried in flue gas and wasting resources, this device uses an air pump to draw flue gas into the tank. Due to the high temperature of the flue gas, heat exchange occurs with the heat exchange pipe, heating the cold water inside the pipe and enabling the recovery and utilization of the flue gas's waste heat, avoiding resource waste. After the waste heat of the flue gas is recovered, an alkaline liquid is injected into the connecting pipe, allowing the liquid to enter the connecting plate through the connecting pipe, and then sprayed out through multiple spray heads to desulfurize the flue gas.

[0005] As existing devices are used, the shortcomings of this technology have gradually become apparent, mainly in the following aspects:

[0006] First, existing waste heat recovery devices have a limited contact area with flue gas during use, which makes it impossible to fully recover and utilize the waste heat of the flue gas, thus reducing the efficiency of waste heat recovery.

[0007] Secondly, when existing waste heat recovery devices are in use, the flue gas entering the device contains dust, which easily adheres to the inside of the waste heat recovery device, thereby affecting the heat exchange efficiency and reducing the waste heat recovery efficiency.

[0008] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model provides a waste heat recovery device for flue gas desulfurization. This device solves the problems of existing waste heat recovery devices having limited contact area with flue gas, thus failing to fully recover and utilize the waste heat, thereby reducing waste heat recovery efficiency; and existing waste heat recovery devices are also affected by dust in the incoming flue gas, which easily adheres to the inside of the device, thus impacting heat exchange efficiency and reducing waste heat recovery efficiency.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A waste heat recovery device for flue gas desulfurization includes a waste heat recovery shell. The shell has coaxially rotatable chamber disks on their opposing inner walls. A plurality of heat exchange tubes are evenly distributed and fixed between the opposite ends of the two chamber disks. The inner cavities of the heat exchange tubes communicate with the two chamber disks. One chamber disk has an inlet cylinder fixedly connected to it, and the other chamber disk has an outlet cylinder fixedly connected to it.

[0012] A scraper is fixed between the outer rings of the two cavity discs, and the scraper makes frictional contact with the inner wall of the waste heat recovery cylinder shell.

[0013] A flue gas outlet is provided on the bottom surface of the waste heat recovery shell, and a filter screen is fixedly connected inside the flue gas outlet. The scraper is in frictional contact with the upper surface of the filter screen.

[0014] As an optimized solution, the scraper is arranged in an arc shape, and a dust discharge cylinder communicating with its inner cavity is fixedly connected to the lower surface of the waste heat recovery cylinder shell near one end, and a plug is fastened to the lower end of the dust discharge cylinder.

[0015] As an optimized solution, the lower end of the waste heat recovery shell is fixedly connected to a flue gas discharge cylinder that communicates with the flue gas outlet, and the lower end of the flue gas discharge cylinder is connected to a three-way valve.

[0016] As an optimized solution, several heat exchange fins are fixedly attached to the peripheral wall of each heat exchange tube in parallel along the axial direction.

[0017] As an optimized solution, a liquid distribution shell is fixedly connected to the upper end of the waste heat recovery shell, and a number of liquid distribution holes communicating with the liquid distribution shell are evenly distributed in a matrix on the top of the waste heat recovery shell.

[0018] As an optimized solution, a cleaning fluid inlet cylinder is fixedly connected to the upper end of the liquid distribution shell.

[0019] As an optimized solution, a flue gas inlet cylinder that communicates with the inner cavity is fixedly connected to the outer wall of the waste heat recovery cylinder shell near the upper end.

[0020] As an optimized solution, the liquid inlet cylinder is rotatably mounted on the end of the waste heat recovery shell, and the outer end of the liquid inlet cylinder extends to the outside and is rotatably inserted with a liquid inlet connecting cylinder.

[0021] As an optimized solution, the liquid outlet cylinder is rotatably mounted on the end of the waste heat recovery cylinder shell, and the outer end of the liquid outlet cylinder extends to the outside and is rotatably inserted with a liquid outlet connecting cylinder.

[0022] As an optimized solution, a gear ring is fixedly connected to the outer wall of the liquid inlet cylinder, and a drive motor is fixedly connected to the outer end wall of the waste heat recovery cylinder shell. The output shaft of the drive motor meshes with the gear ring using gears.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] The liquid is connected to the water pipe that needs to be heated by the liquid inlet connecting tube and the liquid outlet connecting tube. The liquid enters the cavity shell at one end through the liquid inlet connecting tube, then disperses into the heat exchange tube, and finally exits through the cavity shell at the other end along the liquid outlet connecting tube. The liquid is diverted, which can increase the contact area with the inner cavity of the waste heat recovery shell.

[0025] High-temperature flue gas enters through the flue gas inlet and exits through the flue gas outlet. After entering, the flue gas passes through the gaps between several heat exchange tubes, achieving heat exchange with the liquid inside the heat exchange tubes. This can greatly increase the heat exchange area and thus improve the waste heat recovery efficiency.

[0026] During use, the drive motor rotates the cavity disk and several heat exchange tubes, which can further increase the contact area with the flue gas and improve the heat exchange efficiency.

[0027] When the cavity plate rotates, it drives the arc-shaped scraper to rub against the inner wall of the waste heat recovery cylinder shell, thereby scraping off the dust adhering to the inner wall of the waste heat recovery cylinder shell. Since the scraper is arc-shaped, it can guide the dust to one end and introduce the dust into the dust discharge cylinder for collection. The dust can then be cleaned by disassembling and assembling the plug.

[0028] By setting up a liquid distribution shell, when a thorough cleaning of the waste heat recovery cylinder shell is required, cleaning liquid is introduced through the liquid distribution holes to thoroughly clean the interior. The cleaned liquid is then switched to the external interface through a three-way valve to discharge the cleaned liquid. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the flue gas inlet cylinder of this utility model.

[0032] In the diagram: 1-Waste heat recovery shell; 2-Cavity plate; 3-Heat exchange tube; 4-Heat exchange fins; 5-Liquid distribution shell; 6-Cleaning fluid inlet cylinder; 7-Liquid distribution hole; 8-Liquid inlet cylinder; 9-Liquid inlet connecting cylinder; 10-Gear ring; 11-Drive motor; 12-Liquid outlet cylinder; 13-Liquid outlet connecting cylinder; 14-Flue gas outlet; 15-Filter screen; 16-Flue gas discharge cylinder; 17-Three-way valve; 18-Dust discharge cylinder; 19-Plug; 20-Scraper; 21-Flue gas inlet cylinder. Detailed Implementation

[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0034] like Figure 1 and Figure 2 As shown, the waste heat recovery device in flue gas desulfurization includes a waste heat recovery shell 1. Two chamber disks 2 are coaxially rotatable on their respective inner walls. A plurality of heat exchange tubes 3 are evenly distributed and fixed between the opposite ends of the two chamber disks 2. The inner cavity of each heat exchange tube 3 communicates with the two chamber disks 2. An inlet cylinder 8 is fixedly connected to one chamber disk 2, and an outlet cylinder 12 is fixedly connected to the other chamber disk 2.

[0035] A scraper 20 is fixed between the outer rings of the two cavity discs 2. The scraper 20 is in frictional contact with the inner wall of the waste heat recovery cylinder shell 1.

[0036] A flue gas outlet 14 is provided on the bottom surface of the waste heat recovery shell 1. A filter screen 15 is fixed inside the flue gas outlet 14, and the scraper 20 is in frictional contact with the upper surface of the filter screen 15.

[0037] The scraper 20 is arc-shaped, and a dust discharge cylinder 18 that communicates with its inner cavity is fixed to the lower surface of the waste heat recovery cylinder shell 1 near one end. A plug 19 is fastened to the lower end of the dust discharge cylinder 18.

[0038] The lower end of the waste heat recovery shell 1 is fixedly connected to a flue gas discharge cylinder 16 that connects to the flue gas discharge outlet 14. The lower end of the flue gas discharge cylinder 16 is connected to a three-way valve 17. The other two ports of the three-way valve 17 are connected to the outside and the flue gas pipeline, respectively.

[0039] Several heat exchange fins 4 are fixedly attached to the peripheral wall of each heat exchange tube 3 in parallel along the axial direction.

[0040] The upper end of the waste heat recovery shell 1 is fixed with a liquid distribution shell 5, and the top of the waste heat recovery shell 1 has a number of liquid distribution holes 7 that are connected to the liquid distribution shell in a matrix.

[0041] The upper end of the liquid distribution housing 5 is fixed with a cleaning liquid inlet cylinder 6.

[0042] A flue gas inlet cylinder 21, which connects to the inner cavity of the waste heat recovery cylinder shell, is fixed to the outer wall near the upper end of the shell.

[0043] The liquid inlet cylinder 8 is rotatably installed on the end of the waste heat recovery cylinder shell. The outer end of the liquid inlet cylinder 8 extends to the outside and is rotatably inserted with the liquid inlet connecting cylinder 9.

[0044] The liquid outlet cylinder 12 is rotatably mounted on the end of the waste heat recovery cylinder shell. The outer end of the liquid outlet cylinder 12 extends to the outside and is rotatably inserted with the liquid outlet connecting cylinder 13.

[0045] A sealing ring is provided between the liquid inlet cylinder 8 and the liquid inlet connecting cylinder 9, and between the liquid outlet cylinder 12 and the liquid outlet connecting cylinder 13, to prevent leakage.

[0046] A gear ring 10 is fixedly connected to the outer wall of the liquid inlet cylinder 8, and a drive motor 11 is fixedly connected to the outer end wall of the waste heat recovery cylinder shell. The output shaft of the drive motor 11 meshes with the gear ring 10 using gears.

[0047] The working principle of this device is as follows:

[0048] The liquid is connected to the water pipe that needs to be heated through the liquid inlet connecting tube 9 and the liquid outlet connecting tube 13. The liquid enters the cavity shell at one end through the liquid inlet connecting tube 9, then disperses into the heat exchange tube 3, and finally exits through the cavity shell at the other end along the liquid outlet connecting tube 13. The liquid is diverted, which can increase the contact area with the inner cavity of the waste heat recovery shell.

[0049] High-temperature flue gas enters through flue gas inlet 21 and exits through flue gas outlet 16. After entering, the flue gas passes through the gap between several heat exchange tubes 3, realizing heat exchange with the liquid inside the heat exchange tubes 3, which can greatly increase the heat exchange area and thus improve the waste heat recovery efficiency.

[0050] When in use, the drive motor 11 drives the cavity disk 2 and several heat exchange tubes 3 to rotate, which can further increase the contact area with the flue gas and improve the heat exchange efficiency.

[0051] When the cavity plate 2 rotates, it drives the arc-shaped scraper 20 to rub against the inner wall of the waste heat recovery cylinder shell 1, thereby scraping off the dust adhering to the inner wall of the waste heat recovery cylinder shell 1. Since the scraper 20 is arc-shaped, it can guide the dust to one end and introduce the dust into the dust discharge cylinder 18 for collection. The dust can then be cleaned by disassembling and assembling the plug 19.

[0052] By setting up the liquid distribution shell 5, when it is necessary to thoroughly clean the waste heat recovery cylinder shell 1, the cleaning liquid is introduced through the liquid distribution hole 7 to thoroughly clean the inside. The cleaned liquid is then switched to the external interface through the three-way valve 17 to discharge the cleaned liquid.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A waste heat recovery device for flue gas desulfurization, characterized in that: The device includes a waste heat recovery shell (1), on which cavity disks (2) are coaxially rotatably provided on the inner walls of the waste heat recovery shell (1). Several heat exchange tubes (3) are evenly distributed and fixed between the opposite ends of the two cavity disks (2). The inner cavity of the heat exchange tubes (3) is connected to the two cavity disks (2). One cavity disk (2) is fixedly connected to an inlet cylinder (8), and the other cavity disk (2) is fixedly connected to an outlet cylinder (12). A scraper (20) is fixed between the outer rings of the two cavity discs (2), and the scraper (20) is in frictional contact with the inner wall of the waste heat recovery cylinder shell (1). The waste heat recovery shell (1) has a flue gas outlet (14) on its bottom surface. A filter screen (15) is fixed inside the flue gas outlet (14). The scraper (20) is in frictional contact with the upper surface of the filter screen (15).

2. The waste heat recovery device in flue gas desulfurization according to claim 1, characterized in that: The scraper (20) is arc-shaped, and a dust discharge cylinder (18) communicating with its inner cavity is fixed to the lower surface of the waste heat recovery cylinder shell (1) near one end. A plug (19) is fastened to the lower end of the dust discharge cylinder (18).

3. The waste heat recovery device in flue gas desulfurization according to claim 2, characterized in that: The lower end of the waste heat recovery shell (1) is fixedly connected to a flue gas discharge cylinder (16) that communicates with the flue gas discharge outlet (14), and the lower end of the flue gas discharge cylinder (16) is connected to a three-way valve (17).

4. The waste heat recovery device in flue gas desulfurization according to claim 3, characterized in that: Several heat exchange fins (4) are fixedly attached to the peripheral wall of each heat exchange tube (3) in parallel along the axial direction.

5. The waste heat recovery device in flue gas desulfurization according to claim 4, characterized in that: The upper end of the waste heat recovery shell (1) is fixed with a liquid distribution shell (5), and the top of the waste heat recovery shell (1) has a number of liquid distribution holes (7) that are connected to the liquid distribution shell (5) in a matrix.

6. The waste heat recovery device in flue gas desulfurization according to claim 5, characterized in that: The upper end of the liquid distribution housing (5) is fixed with a cleaning liquid inlet cylinder (6).

7. The waste heat recovery device in flue gas desulfurization according to claim 6, characterized in that: The waste heat recovery shell (1) has a flue gas inlet cylinder (21) connected to its inner cavity on the outer wall near the upper end.

8. The waste heat recovery device in flue gas desulfurization according to claim 7, characterized in that: The liquid inlet cylinder (8) is rotatably mounted on the end of the waste heat recovery cylinder shell (1). The outer end of the liquid inlet cylinder (8) extends to the outside and is rotatably inserted with a liquid inlet connecting cylinder (9).

9. The waste heat recovery device in flue gas desulfurization according to claim 8, characterized in that: The liquid outlet cylinder (12) is rotatably mounted on the end of the waste heat recovery cylinder shell (1). The outer end of the liquid outlet cylinder (12) extends to the outside and is rotatably inserted with a liquid outlet connecting cylinder (13).

10. The waste heat recovery device in flue gas desulfurization according to claim 9, characterized in that: A toothed ring (10) is fixedly connected to the outer wall of the liquid inlet cylinder (8), and a drive motor (11) is fixedly connected to the outer end wall of the waste heat recovery cylinder shell (1). The output shaft of the drive motor (11) meshes with the toothed ring (10) using gears.

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