Desulfurization and flue gas purification system

Abstract

The utility model discloses a desulfurization and flue gas purification system which comprises a shell, a lining plate, a swirler and a flow guide cover, and the shell is provided with an overflowing channel along the horizontal direction; the lining plate divides the overflowing channel into a desulfurization reaction chamber and a gas-liquid separation chamber, the swirler is arranged on the lining plate, the two ends of the swirler extend to the desulfurization reaction chamber and the gas-liquid separation chamber respectively, a spiral runner is arranged in the swirler, and multiple groups of flow dividing holes are formed in the positions, located in the desulfurization reaction chamber and the gas-liquid separation chamber, of the periphery of the swirler respectively; one end of the flow guide cover is connected to an air inlet of the flow passing channel, the other end of the flow guide cover extends to be connected with the cyclone, the cross section of the flow guide cover is of a concentric circle or concentric-square-shaped structure, multiple sets of flow guide holes are formed in the inner circumference and the outer circumference of the flow guide cover respectively, and a liquid inlet of the flow guide cover is connected to the liquid storage unit through a liquid supply pipeline. And the liquid outlet of the flow guide cover is connected to the liquid inlet end of the cyclone. The system is simple in structure, filler and an atomizing nozzle do not need to be arranged by designing the flow guide cover, and the use cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization and purification, in particular to a flue gas desulfurization and purification system. Background Art

[0002] Industrial equipment such as boilers produces polluting flue gas. Sulfur dioxide in flue gas, for example, is a significant atmospheric pollutant and a primary source of acid rain. Purification is generally required to meet environmental protection requirements. For example, Chinese utility model patent publication number CN220047697U discloses a flue gas desulfurization purification device. This device utilizes a two-stage packing layer to increase the contact area between the flue gas to be desulfurized and the circulating spray liquid, allowing the sulfur dioxide to react with the desulfurizer in the circulating spray liquid on the packing layer.

[0003] However, in the above method, the effective flow length of the packing layer is extended along the gas flow direction to increase the effective contact area between the reaction liquid sprayed by the atomizing nozzle and the flue gas, which greatly increases the cost of use. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a flue gas desulfurization system to solve the technical problems mentioned in the prior art.

[0005] A flue gas desulfurization system, comprising:

[0006] The shell is provided with a flow passage in a horizontal direction;

[0007] a lining plate, dividing the flow channel into a desulfurization reaction chamber and a gas-liquid separation chamber, wherein the desulfurization reaction chamber is communicated with the air inlet of the flow channel, and the gas-liquid separation chamber is communicated with the air outlet of the flow channel;

[0008] A cyclone is provided on the liner, with both ends of the cyclone extending to the desulfurization reaction chamber and the gas-liquid separation chamber respectively. The interior of the cyclone has a spiral flow channel, and the outer periphery of the cyclone is provided with multiple groups of flow holes in the desulfurization reaction chamber and the gas-liquid separation chamber respectively.

[0009] A flow guide cover, one end of which is connected to the air inlet of the flow channel, and the other end extends to connect with the cyclone. The cross-section of the flow guide cover is a concentric circle or a circular structure, and multiple groups of flow guide holes are respectively provided on its inner and outer circumferences. The liquid inlet of the flow guide cover is connected to the liquid storage unit through a liquid supply pipeline, and the liquid outlet of the flow guide cover is connected to the liquid inlet end of the cyclone.

[0010] Optionally, the air guide cover is a conical structure, and the large end of the air guide cover is connected to the air inlet of the flow channel.

[0011] Optionally, center lines of the guide holes located on the inner periphery and outer periphery of the air guide cover do not overlap with each other.

[0012] Optionally, an annular flow distribution cavity is provided on the side of the shell close to the air inlet of the flow channel, and the flow distribution cavity is connected to the flow guide cover. The liquid outlet end of the liquid storage unit is connected to the flow distribution cavity through the liquid supply pipeline, so that the reaction liquid stored in the liquid storage unit is transported to the flow distribution cavity through the liquid supply pipeline for uniform distribution and sent into the flow guide cover.

[0013] Optionally, the guide cover is installed on the outer peripheral side of the air inlet of the flow channel, and a drain pipe is provided at the bottom of the guide cover, and the drain pipe is used to discharge the liquid on the inner peripheral side of the guide cover into the desulfurization reaction chamber.

[0014] Optionally, a demister is provided at the air outlet of the flow channel.

[0015] Optionally, the air inlet and the air outlet of the flow channel are respectively provided with connecting portions extending toward a side away from the liner, and the connecting portions are used to connect to the air inlet pipe or the air outlet pipe.

[0016] Optionally, the diameter of the connecting portion is respectively larger than the diameters of the air inlet and the air outlet of the flow channel.

[0017] Optionally, arc-shaped guide portions are respectively provided between the connecting portion and the air inlet and the air outlet of the flow channel.

[0018] Optionally, drain ports are provided at the bottom of the shell and located in the desulfurization reaction chamber and the gas-liquid separation chamber, respectively. The drain ports are connected to the liquid inlet of the recovery tank, and a control valve is provided at the liquid outlet of the recovery tank.

[0019] The beneficial effects produced by the utility model include:

[0020] The desulfurization and purification flue gas system provided by the present invention, during the use stage, first starts the liquid storage unit to transport the reaction liquid into the guide cover and spray it out through the guide hole, then introduces the flue gas containing sulfur dioxide into the guide cover through the air inlet pipe, and flows into the guide cover from the guide hole on the inner peripheral side of the guide cover, where it fully contacts with the reaction liquid to cause a desulfurization reaction, and then flows into the desulfurization reaction chamber from the guide hole on the outer peripheral side of the guide cover to slow down the flow speed of the flue gas, so that it gradually passes through the diverter hole and flows into the cyclone, where it further causes a desulfurization reaction with the reaction liquid inside the cyclone, and is guided to flow along the spiral flow channel under the continuous flow of gas and liquid, which can improve the gas-liquid mixing effect, and at the same time, the liquid is discharged from the diverter hole on the bottom side of the cyclone into the desulfurization reaction chamber and / or the gas-liquid separation chamber, and the gas is discharged from the diverter hole on the top side of the cyclone into the gas-liquid separation chamber to achieve gas-liquid separation, and then the purified gas is discharged to the next treatment unit through the exhaust pipe. The system has a simple structure and, through the design of a guide cover, does not require the arrangement of fillers and atomizing nozzles, which can effectively reduce the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the desulfurization and flue gas purification system of the present utility model;

[0022] In the figure: 1. Shell, 2. Flow channel, 3. Liner, 4. Desulfurization reaction chamber, 5. Gas-liquid separation chamber, 6. Cyclone, 7. Spiral flow channel, 8. Diversion hole, 9. Flow guide cover, 10. Flow guide hole, 11. Recovery tank, 12. Drain port, 13. Flow distribution cavity, 14. Drain pipe, 15. Defoamer, 16. Connecting part, 17. Arc-shaped guide part, 18. Control valve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1As shown, the utility model provides a desulfurization and flue gas purification system, which includes a shell 1, a liner 3, a cyclone 6 and a flow guide 9. The shell 1 is provided with a flow channel 2 in the horizontal direction; the liner 3 divides the flow channel 2 into a desulfurization reaction chamber 4 and a gas-liquid separation chamber 5, the desulfurization reaction chamber 4 is connected to the air inlet of the flow channel 2, and the gas-liquid separation chamber 5 is connected to the air outlet of the flow channel 2; the cyclone 6 is provided on the liner 3, and the two ends of the cyclone 6 extend to the desulfurization reaction chamber 4 and the gas-liquid separation chamber 5 respectively. 6 has a spiral flow channel 7 inside, and the outer periphery of the cyclone 6 is provided with multiple groups of diversion holes 8 located in the desulfurization reaction chamber 4 and the gas-liquid separation chamber 5; one end of the guide cover 9 is connected to the air inlet of the flow channel 2, and the other end extends to connect with the cyclone 6. The cross section of the guide cover 9 is a concentric circle or a circular structure, and multiple groups of diversion holes 10 are provided on its inner and outer peripheries. The liquid inlet of the guide cover 9 is connected to the liquid storage unit through a liquid supply pipeline, and the liquid outlet of the guide cover 9 is connected to the liquid inlet end of the cyclone 6. In the above, the system has a simple structure. By designing the guide cover 9, it does not need to arrange fillers and atomizing nozzles, which can effectively reduce the cost of use. Specifically, the air inlet of the flow channel 2 of the system is connected to the air inlet pipe, and the air outlet is connected to the air outlet pipe to complete the assembly of the system; in the use stage, the liquid storage unit is first started to transport the reaction liquid into the guide cover 9 and spray it out through the guide hole 10, and then the flue gas containing sulfur dioxide is introduced into the guide cover 9 through the air inlet pipe, and flows into the guide cover 9 from the guide hole 10 on the inner side of the guide cover 9 to fully contact with the reaction liquid to cause desulfurization reaction, and then flows into the desulfurization reaction chamber 4 from the guide hole 10 on the outer side of the guide cover 9 to slow down the flue gas. The flow rate is adjusted so that it gradually passes through the diverter hole 8 and flows into the cyclone 6, where it further undergoes a desulfurization reaction with the reaction liquid inside the cyclone 6, and is guided to flow along the spiral flow channel 7 under the continuous flow of gas and liquid, which can improve the gas-liquid mixing effect. At the same time, the liquid is discharged from the diverter hole 8 on the bottom side of the cyclone 6 into the desulfurization reaction chamber 4 and / or the gas-liquid separation chamber 5, and the gas is discharged from the diverter hole 8 on the top side of the cyclone 6 into the gas-liquid separation chamber 5 to achieve gas-liquid separation, and then the purified gas is discharged to the next treatment unit through the exhaust pipe.

[0025] In this embodiment, the deflector 9 is a conical structure, and the large end of the deflector 9 is connected to the air inlet of the flow channel 2 to increase the flue gas flow rate on the inner peripheral side of the deflector 9. This can prevent the flue gas from being unable to completely flow into the deflector 9 from the deflector holes 10 on the inner peripheral side of the deflector 9 due to the pressure of the reaction liquid. As a result, the reaction liquid inside the deflector 9 is forced to flow out from the liquid outlet end of the deflector 9 or the deflector holes 10 on its outer peripheral side under the action of the flue gas pressure, so as to prevent the reaction liquid from flowing into the inner peripheral side of the deflector 9 and flowing back into the air inlet pipe. Furthermore, the deflector 9 is installed on the outer peripheral side of the air inlet of the flow channel 2, and a drain pipe 14 is provided at the bottom of the deflector 9. The drain pipe 14 is used to discharge the liquid on the inner peripheral side of the deflector 9 into the desulfurization reaction chamber 4.

[0026] In the above, the center lines of the guide holes 10 located on the inner and outer peripheries of the guide cover 9 do not overlap with each other, so as to cause turbulence to the flue gas, thereby extending the effective contact time between the flue gas and the reaction liquid and improving the desulfurization reaction effect. Furthermore, an annular flow distribution cavity 13 is provided on the side of the shell 1 close to the air inlet of the flow channel 2. The flow distribution cavity 13 is connected to the guide cover 9, and the liquid outlet end of the liquid storage unit is connected to the flow distribution cavity 13 through a liquid supply pipeline, so that the reaction liquid stored in the liquid storage unit is transported to the flow distribution cavity 13 through the liquid supply pipeline for uniform distribution and sent into the guide cover 9, thereby ensuring that the reaction liquid inside the guide cover 9 flows evenly, so as to discharge the reaction liquid that has participated in the desulfurization reaction from the guide cover 9 in time, and avoid the incomplete replacement of the reaction liquid inside the guide cover 9 causing the local flue gas to fail to achieve the desulfurization effect.

[0027] Furthermore, a demister 15 is provided at the gas outlet of the flow channel 2 to remove liquid contained in the purified gas.

[0028] Furthermore, the air inlet and air outlet of the flow channel 2 are each provided with a connecting portion 16 extending toward the side away from the liner 3. The connecting portion 16 is used to connect to the air inlet pipe or the air outlet pipe. Specifically, the connecting portion 16 can be a threaded joint to facilitate quick installation of the air inlet pipe and the air outlet pipe. In the above, the diameter of the connecting portion 16 is respectively larger than the diameter of the air inlet and air outlet of the flow channel 2 to further increase the air pressure at the air inlet of the flow channel 2. Among them, an arc-shaped guide portion 17 is provided between the connecting portion 16 and the air inlet and air outlet of the flow channel 2 to reduce the impact damage caused by smoke on the flow channel 2.

[0029] Furthermore, a drain port 12 is provided at the bottom of the housing 1, located within the desulfurization reaction chamber 4 and the gas-liquid separation chamber 5. The drain port 12 is connected to the liquid inlet of the recovery tank 11. A control valve 18 is provided at the liquid outlet of the recovery tank 11. Specifically, the control valve 18 can be configured as a float switch valve, so that when the liquid level in the recovery tank 11 exceeds a preset value, the liquid outlet of the recovery tank 11 is opened to discharge the liquid, thereby preventing flue gas from flowing out of the drain port 12 and causing air pollution.

Claims

1. Desulfurization and flue gas purification system, characterized by: The system comprises: The housing (1) is provided with a flow passage (2) in a horizontal direction; a lining plate (3) for dividing the flow passage (2) into a desulfurization reaction chamber (4) and a gas-liquid separation chamber (5); the desulfurization reaction chamber (4) is in communication with the air inlet of the flow passage (2); and the gas-liquid separation chamber (5) is in communication with the air outlet of the flow passage (2); A cyclone (6) is provided on the liner (3), with both ends of the cyclone (6) extending to the desulfurization reaction chamber (4) and the gas-liquid separation chamber (5), respectively. The interior of the cyclone (6) is provided with a spiral flow channel (7), and the outer periphery of the cyclone (6) is provided with multiple flow holes (8) in the desulfurization reaction chamber (4) and the gas-liquid separation chamber (5); A flow guide cover (9) is connected at one end to the air inlet of the flow channel (2) and at the other end extends to be connected to the cyclone (6). The cross section of the flow guide cover (9) is a concentric circle or a circular structure, and a plurality of groups of flow guide holes (10) are respectively provided on the inner circumference and the outer circumference thereof. The liquid inlet of the flow guide cover (9) is connected to the liquid storage unit through a liquid supply pipeline, and the liquid outlet of the flow guide cover (9) is connected to the liquid inlet end of the cyclone (6).

2. The flue gas desulfurization system according to claim 1, characterized in that: The deflector cover (9) is a conical structure, and the large end of the deflector cover (9) is connected to the air inlet of the flow passage (2).

3. The flue gas desulfurization system according to claim 1, characterized in that: The center lines of the guide holes (10) located on the inner periphery and the outer periphery of the guide cover (9) do not overlap with each other.

4. The flue gas desulfurization system according to claim 1, characterized in that: An annular flow distribution cavity (13) is provided on one side of the shell (1) close to the air inlet of the flow channel (2), and the flow distribution cavity (13) is communicated with the flow guide cover (9). The liquid outlet end of the liquid storage unit is connected to the flow distribution cavity (13) through the liquid supply pipeline, so that the reaction liquid stored in the liquid storage unit is transported to the flow distribution cavity (13) through the liquid supply pipeline for uniform distribution and then sent into the flow guide cover (9).

5. The flue gas desulfurization system according to claim 1, characterized in that: The guide cover (9) is installed on the outer peripheral side of the air inlet of the flow channel (2), and a drain pipe (14) is provided at the bottom of the guide cover (9). The drain pipe (14) is used to discharge the liquid on the inner peripheral side of the guide cover (9) into the desulfurization reaction chamber (4).

6. The flue gas desulfurization system according to claim 1, characterized in that: The air outlet of the flow passage (2) is provided with a demister (15).

7. The flue gas desulfurization system according to claim 1, characterized in that: The air inlet and the air outlet of the flow passage (2) are respectively provided with a connecting portion (16) extending toward a side away from the lining plate (3), and the connecting portion (16) is used to connect to an air inlet pipe or an air outlet pipe.

8. The flue gas desulfurization system according to claim 7, characterized in that: The diameter of the connecting portion (16) is respectively larger than the diameters of the air inlet and the air outlet of the flow channel (2).

9. The flue gas desulfurization system according to claim 7, characterized in that: Arc-shaped flow guides (17) are respectively provided between the connecting portion (16) and the air inlet and the air outlet of the flow passage (2).

10. The flue gas desulfurization system according to claim 1, characterized in that: A liquid discharge port (12) is provided at the bottom of the shell (1) and located in the desulfurization reaction chamber (4) and the gas-liquid separation chamber (5), respectively. The liquid discharge port (12) is connected to the liquid inlet end of the recovery tank (11), and a control valve (18) is provided at the liquid outlet end of the recovery tank (11).

Images