A flue gas scrubbing and purification device and method

Abstract

This invention provides a flue gas scrubbing and purification device and method, including a flue gas scrubbing tower, an inlet pipe and an outlet pipe installed on the upper surface of the flue gas scrubbing tower, a back-spray scrubbing device extending into the inlet pipe, a partition device installed inside the flue gas scrubbing tower, a cooling device for cooling the scrubbing liquid located below the partition device, a T-junction assembly installed at the bottom of the back-spray scrubbing device, a first end of the T-junction assembly connected to the bottom of the cooling device, and a second end of the T-junction assembly connected to a first liquid storage tank; a drain device is installed at the bottom of the cooling device. This invention enables continuous replacement of the scrubbing liquid without shutting down the system, thus continuously purifying the flue gas and ensuring high efficiency in flue gas purification.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and in particular to a flue gas scrubbing and purification device and method. Background Technology

[0002] A large amount of flue gas is generated during the metal smelting process. The SO2-containing mixed flue gas from smelting is removed by an electrostatic precipitator and then enters the flue gas acid production system. In the flue gas acid production system, it needs to be washed and purified by a washing liquid.

[0003] Flue gas scrubbing liquid is usually chosen as a certain concentration of dilute sulfuric acid, which can fully dissolve metallic impurities and dust in the flue gas, ensuring deep purification of the waste gas. The scrubbing liquid is circulated and sprayed out to achieve continuous cooling of the flue gas. However, as the circulation time increases, the temperature of the scrubbing liquid rises, and the cooling effect on the flue gas weakens. Moreover, after the predetermined cleaning cycle time, the internal composition of the scrubbing liquid changes, and the impurities increase, requiring the scrubbing liquid to be replaced for purification. However, traditional scrubbers require the shutdown of designated equipment during the scrubbing liquid replacement process, which affects the continuous purification of flue gas and limits the efficiency of the flue gas purification system. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a flue gas scrubbing and purification device and method. This invention enables continuous replacement of the scrubbing liquid without shutting down the system, thereby continuously purifying the flue gas and ensuring the efficiency of flue gas purification.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: A flue gas scrubbing and purification device includes a flue gas scrubbing tower, an inlet pipe and an outlet pipe installed on the upper surface of the flue gas scrubbing tower, a back-spray scrubbing device extending into the inlet pipe, a partition device installed inside the flue gas scrubbing tower, a cooling device for cooling the scrubbing liquid installed below the partition device, a three-way assembly installed at the bottom of the back-spray scrubbing device, a first end of the three-way assembly connected to the bottom of the cooling device, and a second end of the three-way assembly connected to a first liquid storage tank; a drain device is installed at the bottom of the cooling device; wherein, when the drain device is open, the three-way assembly is connected to the first liquid storage tank to complete the continuous pumping of the scrubbing liquid.

[0006] Preferably, the reverse spray washing device includes a main delivery pipe, a reverse spray head fixed at the end of the main delivery pipe and installed inside the air inlet pipe, a delivery pump body connected in series with the main delivery pipe, and the three-way assembly connected to the first liquid storage tank through a branch delivery pipe.

[0007] Preferably, the cooling device includes multiple cooling plates, each containing a heat pipe. The cooling plates have vertically penetrating flow openings at their edges, and the flow openings on the surfaces of adjacent cooling plates are staggered, forming a serpentine cooling path between the multiple cooling plates.

[0008] Preferably, it further includes a cleaning device, which includes a cleaning drive shaft and cleaning rods. The cleaning rods are spaced apart and are vertically installed on the side wall of the cleaning drive shaft. A first passage opening for the cleaning drive shaft to pass through is opened at the axial position of the cooling plate. A second passage opening adapted to the cleaning rods is opened in the direction of the flow opening of the first passage opening.

[0009] Preferably, the cleaning device further includes a rotation drive assembly and a rotation lifting assembly. The telescopic end of the rotation lifting assembly is fixed to the cleaning drive shaft. The rotation drive assembly controls the rotation of the rotation lifting assembly to drive the cleaning drive shaft to rotate.

[0010] Preferably, the draining device includes a drain valve installed at the bottom of the cooling device, the rotating lifting assembly has a hollow structure, the drain valve is connected to the bottom of the rotating lifting assembly through a drain pipe, a filter device is connected in series inside the drain pipe, and a drain opening is installed at the bottom of the filter device.

[0011] Preferably, the cleaning drive shaft is hollow, and the bottom of the cleaning rod has a strip-shaped cleaning opening facing the upper surface of the cooling plate.

[0012] Preferably, the separating device includes a separating plate, a separating block is rotatably connected to the surface of the separating plate, a through separating opening is opened on the surface of the separating block, and an electrical control device is connected to the separating block.

[0013] Preferably, a temporary storage chamber is formed by a predetermined distance between the separating device and the bottom of the air intake pipe, and the air outlet pipe is positioned opposite the temporary storage chamber.

[0014] A flue gas scrubbing and purification method includes the following steps: S1, controlling the flue gas to enter from the inlet pipe and exit from the outlet pipe, while simultaneously spraying scrubbing liquid towards the inlet pipe through a back-spray scrubbing device; S2, after the back-spray scrubbing device has been scrubbing for a predetermined time, controlling the separation device to close, controlling the drainage device to open, and simultaneously controlling the three-way assembly to open with the first liquid storage tank to complete the continuous pumping of scrubbing liquid.

[0015] The beneficial effects of this invention are as follows: Compared with the existing technology that requires centralized replacement of washing liquid during shutdown, the present invention, through the setting of a separation device and a drainage device, can continuously replace the washing liquid without shutting down the machine, ensuring the efficiency of washing liquid replacement. At the same time, switching the conduction state of the three-way component can pump the washing liquid in the first storage tank into the inlet pipe for continuous purification of flue gas, ensuring the efficiency of flue gas purification. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 For the present invention Figure 1 A top-view structural diagram.

[0018] Figure 3 For the present invention Figure 2 A schematic diagram of the AA-direction cross-section structure.

[0019] Figure 4 For the present invention Figure 3 Schematic diagram of the BB-direction cross-section structure.

[0020] Figure 5 This is a schematic diagram of the cooling plate structure of the present invention.

[0021] Figure 6 For the present invention Figure 3 A magnified structural diagram at point C.

[0022] Figure 7 For the present invention Figure 3 A magnified structural diagram at point D.

[0023] In the diagram: 100, Flue gas scrubbing tower; 200, Inlet pipe; 300, Outlet pipe; 400, Backspray scrubbing device; 410, Backspray nozzle; 420, Main conveying pipe; 430, Conveying pump body; 440, T-junction assembly; 450, Branch conveying pipe; 500, Separating device; 510, Separating plate; 520, Separating block; 521, Separating opening; 600, Cooling device; 610, Cooling plate; 611, First passage opening; 612, Second passage opening; 613, Flow opening; 700, Cleaning device; 710, Cleaning rod; 720, Cleaning drive shaft; 730, Rotary lifting assembly; 740, Rotary drive assembly; 800, Drainage device; 810, Drainage valve; 820, Drainage pipe; 830, Filtering device; 840, Drainage opening. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] See attached document Figure 1 - AppendixFigure 7 A flue gas scrubbing and purification device includes a flue gas scrubbing tower 100, an inlet pipe 200 and an outlet pipe 300 installed on the upper surface of the flue gas scrubbing tower 100, and a reverse-jet scrubbing device 400 extending into the inlet pipe 200. High-temperature flue gas enters the flue gas scrubbing tower 100 downward from the inlet pipe 200 and is drawn out by negative pressure at the outlet pipe 300, achieving a serpentine bend. During this process, the reverse-jet scrubbing device 400 sprays scrubbing liquid in the opposite direction of the flue gas flow to purify the high-temperature flue gas, reduce the temperature of the high-temperature flue gas, and absorb some metal impurities and dust impurities in the flue gas to achieve deep purification of the flue gas.

[0026] The washing liquid used here is 4%~10% dilute sulfuric acid, which can effectively dissolve some of the residual impurities such as arsenic and fluorine in the flue gas in the acid, and at the same time effectively absorb sulfur dioxide, ensuring deep purification of the waste gas. The washing liquid is circulated and sprayed out to achieve continuous cooling of the flue gas. However, as the circulation time increases, the temperature of the washing liquid rises, and the cooling effect on the flue gas weakens. Moreover, after the washing liquid has been circulated for a predetermined time, its internal composition changes and the impurities increase, so the washing liquid needs to be replaced for purification.

[0027] To address the aforementioned issues and achieve cooling of the washing liquid and non-stop liquid replacement, a partition device 500 is installed inside the flue gas scrubbing tower 100. Below the partition device 500, a cooling device 600 is installed to cool the washing liquid. A three-way assembly 440 is installed at the bottom of the reverse-jet scrubbing device 400. The first end of the three-way assembly 440 is connected to the bottom of the cooling device 600, and the second end of the three-way assembly 440 is externally connected to a first liquid storage tank. A drain device 800 is installed at the bottom of the cooling device 600. When the washing liquid needs to be replaced, the partition device 500 is first kept in a closed state. At this time, a predetermined distance exists between the partition device 500 and the bottom of the inlet pipe 200, forming a temporary storage chamber. The outlet pipe 300 is positioned opposite the temporary storage chamber, allowing for... The newly added washing liquid can be stored in the temporary storage chamber. Then, the drain device 800 is turned on, and the three-way assembly 440 is connected to the first storage tank to complete the continuous pumping of the washing liquid. At this time, the washing liquid to be replaced in the flue gas scrubbing tower 100 is discharged from the drain device 800, and at the same time, the new washing liquid enters the branch conveying pipe 450 from the first storage tank and is sprayed out from the end of the reverse spray scrubbing device 400 to achieve continuous washing of the flue gas in the intake pipe 200. After the washing liquid to be replaced is replaced, the drain device 800 is turned off, the separator 500 is turned on, and the new washing liquid circulates between the flue gas scrubbing tower 100 and the reverse spray scrubbing device 400 to achieve the recirculation, cooling and purification of the flue gas in the intake pipe 200.

[0028] Please refer to the appendix for details. Figure 3Specifically, the reverse spray scrubbing device 400 includes a main conveying pipe 420, at the end of which a reverse nozzle 410 is fixed and installed inside the air inlet pipe 200. A conveying pump body 430 is connected in series to the main conveying pipe 420. A three-way assembly 440 is connected to the first liquid storage tank through a branch conveying pipe 450. The conveying pump body 430 can control the directional flow of the scrubbing liquid. Specifically, the scrubbing liquid is pumped from the flue gas scrubbing tower 100 into the main conveying pipe 420 and finally sprayed out from the reverse nozzle 410 to cool and purify the flue gas in the air inlet pipe 200. The sprayed scrubbing liquid enters the cooling device 600 under the action of gravity to achieve circulating cooling and finally flows to the bottom position to achieve one cycle of the scrubbing liquid.

[0029] Specifically, the cooling device 600 includes multiple cooling plates 610, each containing a heat exchange pipe. A through-flow opening 613 is located at the edge of each cooling plate 610, and the openings 613 on the surfaces of adjacent cooling plates 610 are staggered, forming a serpentine cooling path between the multiple cooling plates 610. Metal heat exchange pipes are installed within each cooling plate 610, allowing them to contact the washing liquid and exchange heat with it. The alternating arrangement of the cooling plates 610, forming a serpentine cooling path, extends the flow path of the washing liquid and enhances its cooling effect. Through this structural design, the washing liquid can be effectively cooled to ensure effective cooling of the flue gas during circulation. Simultaneously, waste heat within the washing liquid can be recovered to reduce resource loss.

[0030] During the continuous circulation of the washing liquid, the washing liquid absorbs dust and impurities from the flue gas. The dust and impurities adhere to the surface of the cooling plate 610, affecting the flow of the washing liquid and also affecting the heat exchange efficiency of the washing liquid.

[0031] To solve the above problems, the device also includes a cleaning device 700, which includes a cleaning drive shaft 720 and cleaning rods 710. The cleaning rods 710 are spaced apart and are vertically installed on the side wall of the cleaning drive shaft 720. A first passage opening 611 is opened at the axial position of the cooling plate 610 for the cleaning drive shaft 720 to pass through. The first passage opening 611 has a second passage opening 612 adapted to the cleaning rods 710 in the direction of the flow opening 613.

[0032] By controlling the rotation of the cleaning drive shaft 720, the cleaning rod 710 can be driven to rotate along the surface of the cooling plate 610, thereby continuously cleaning the surface of the cooling plate 610. Impurities can fall off the cleaning rod 710 to ensure effective discharge of impurities. At the same time, when the cleaning rod 710 is not being cleaned, its position is opposite to the second passage opening 612, which can block the second passage opening 612 to ensure that the washing liquid can flow in a serpentine manner along a predetermined path, thus ensuring the cooling efficiency of the washing liquid.

[0033] Please refer to the appendix for details. Figure 7 Furthermore, the cleaning device 700 also includes a rotation drive assembly 740 and a rotation lifting assembly 730. The telescopic end of the rotation lifting assembly 730 is fixed to the cleaning drive shaft 720. The rotation drive assembly 740 controls the rotation of the rotation lifting assembly 730 to drive the cleaning drive shaft 720 to rotate. The rotation lifting assembly 730 can control the overall lifting and lowering of the cleaning drive shaft 720 and the cleaning rod 710, so that in the undisturbed state, the cleaning rod 710 can be pressed against the second passage opening 612 to ensure a sealed state at the second passage opening 612 and to ensure the stability of the serpentine flow of the washing liquid. Here, the rotation drive assembly 740 can be selected as a gear drive component, which can control the rotation lifting assembly 730 to drive the upper cleaning drive shaft 720 and the cleaning rod 710 to rotate synchronously.

[0034] Specifically, the drainage device 800 includes a drainage valve 810 installed at the bottom of the cooling device 600. The rotating lifting assembly 730 has a hollow structure. The drainage valve 810 is connected to the bottom of the rotating lifting assembly 730 through a drainage pipe 820. A filter device 830 is connected in series inside the drainage pipe 820. A drainage opening 840 is installed at the bottom of the filter device 830. During operation, the drainage device 800 can discharge the washing liquid in the flue gas scrubbing tower 100 to achieve efficient purification. The filter device 830 can filter and purify the washing liquid and pump a portion of the washing liquid back into the cooling device 600 to ensure efficient discharge of impurities from inside the cooling device 600.

[0035] To achieve the circulation of the filtered washing liquid, the cleaning drive shaft 720 is designed to be hollow, and the bottom of the cleaning rod 710 has a strip-shaped cleaning opening facing the upper surface of the cooling plate 610. The pump body can pump the filtered washing liquid in the filter device 830 back into the cleaning drive shaft 720, and finally spray it out from the cleaning opening. The sprayed washing liquid can directly impact the surface of the cooling plate 610, achieving efficient cleaning of the surface of the cooling plate 610. Through the above structural design, efficient pumping of washing liquid can be achieved, enhancing the cleaning effect on dust and impurities attached to the surface of the cooling plate 610.

[0036] Please refer to the appendix for details. Figure 6Specifically, the separating device 500 includes a separating plate 510, with a separating block 520 rotatably connected to the surface of the separating plate 510. The separating block 520 has a through-hole separating opening 521 on its surface. The separating block 520 is connected to an electrical control device. By controlling the rotation of the separating block 520, the separating opening 521 can be controlled to be in different positions. When the separating opening 521 is controlled to be vertical, it can connect the upper and lower parts inside the flue gas scrubbing tower 100, allowing the scrubbing liquid to pass through normally. When the separating opening 521 is controlled to be horizontal, the separating device 500 is completely closed. At this time, the upper part of the separating device 500 is completely closed, so as to achieve the separation and storage of the scrubbing liquid.

[0037] Using the above-mentioned washing and purification device, a flue gas washing and purification method includes the following steps: S1. Control the flue gas to enter from the inlet pipe 200 and exit from the outlet pipe 300. At the same time, the reverse spray scrubbing device 400 sprays scrubbing liquid towards the inlet pipe 200. The direction of the scrubbing liquid spray is opposite to the direction of flue gas flow, which can absorb impurities in the flue gas, achieve efficient purification of the flue gas, and reduce the temperature of the flue gas to achieve heat recovery.

[0038] S2. After the reverse spray scrubbing device 400 has been used for a predetermined time, the control separation device 500 is closed, the control drainage device 800 is opened, and the control three-way assembly 440 is connected to the first storage tank to complete the continuous pumping of the scrubbing liquid. At this time, the scrubbing liquid to be replaced flows out from the drainage device 800 at the bottom and is filtered and purified externally. The new scrubbing liquid can be pumped from the first storage tank into the reverse spray scrubbing device 400 to achieve continuous purification and cooling of the flue gas, ensuring the efficiency of flue gas purification.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flue gas scrubbing and purification device, comprising a flue gas scrubbing tower (100), an inlet pipe (200) and an outlet pipe (300) installed on the upper surface of the flue gas scrubbing tower (100), and a reverse-jet scrubbing device (400) extending into the inlet pipe (200), characterized in that: The flue gas scrubbing tower (100) is equipped with a partition device (500), and a cooling device (600) for cooling the scrubbing liquid is provided below the partition device (500). A three-way assembly (440) is installed at the bottom of the reverse spray scrubbing device (400). The first end of the three-way assembly (440) is connected to the bottom of the cooling device (600), and the second end of the three-way assembly (440) is connected to the first liquid storage tank. The cooling device (600) is equipped with a drain device (800) at the bottom; wherein, when the drain device (800) is turned on, the three-way assembly (440) is connected to the first liquid storage tank to complete the continuous pumping of the washing liquid; The separating device (500) includes a separating plate (510), a separating block (520) is rotatably connected to the surface of the separating plate (510), a through separating opening (521) is opened on the surface of the separating block (520), and an electrical control device is connected to the separating block (520). A predetermined distance exists between the separator (500) and the bottom of the air inlet pipe (200) to form a temporary storage chamber, and the air outlet pipe (300) is positioned opposite the temporary storage chamber.

2. The flue gas scrubbing and purification device according to claim 1, characterized in that, The reverse spray washing device (400) includes a main delivery pipe (420), at the end of which a reverse spray head (410) is fixed and installed inside the air inlet pipe (200). The main delivery pipe (420) is connected in series with a delivery pump body (430), and the three-way assembly (440) is connected to the first liquid storage tank through a branch delivery pipe (450).

3. The flue gas scrubbing and purification device according to claim 1, characterized in that, The cooling device (600) includes multiple cooling plates (610), so the cooling plates (610) are equipped with heat pipes. The cooling plates (610) have vertically penetrating flow openings (613) at their edges. The flow openings (613) on the surfaces of two adjacent cooling plates (610) are staggered, forming a serpentine cooling path between the multiple cooling plates (610).

4. The flue gas scrubbing and purification device according to claim 3, characterized in that, It also includes a cleaning device (700), which includes a cleaning drive shaft (720) and cleaning rods (710). The cleaning rods (710) are spaced apart and are vertically installed on the side wall of the cleaning drive shaft (720). The cooling plate (610) has a first passage opening (611) at the axial position for the cleaning drive shaft (720) to pass through. The first passage opening (611) has a second passage opening (612) adapted to the cleaning rods (710) in the direction of the flow opening (613).

5. The flue gas scrubbing and purification device according to claim 4, characterized in that, The cleaning device (700) further includes a rotation drive assembly (740) and a rotation lifting assembly (730). The telescopic end of the rotation lifting assembly (730) is fixed to the cleaning drive shaft (720). The rotation drive assembly (740) controls the rotation of the rotation lifting assembly (730) to drive the cleaning drive shaft (720) to rotate.

6. The flue gas scrubbing and purification device according to claim 5, characterized in that, The draining device (800) includes a drain valve (810) installed at the bottom of the cooling device (600). The rotating lifting assembly (730) has a hollow structure. The drain valve (810) is connected to the bottom of the rotating lifting assembly (730) through a drain pipe (820). A filter device (830) is connected in series inside the drain pipe (820). A drain opening (840) is installed at the bottom of the filter device (830).

7. The flue gas scrubbing and purification device according to claim 6, characterized in that, The cleaning drive shaft (720) is hollow, and the bottom of the cleaning rod (710) has a strip-shaped cleaning opening facing the upper surface of the cooling plate (610).

8. A method for flue gas scrubbing and purification, characterized in that, Using the flue gas scrubbing and purification device according to any one of claims 1-7 includes the following steps: S1. Control the flue gas to enter from the intake pipe (200) and exit from the exhaust pipe (300), while simultaneously spraying washing liquid towards the intake pipe (200) through the reverse spray washing device (400); S2. After the reverse spray washing device (400) has been washing for a predetermined time, the control separation device (500) is closed, the control drainage device (800) is opened, and the control three-way assembly (440) is connected to the first storage tank to complete the continuous pumping of washing liquid.

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