Lithium precipitation malodorous waste gas treatment system

Abstract

The utility model provides a lithium precipitation malodorous waste gas treatment system which comprises a packing absorption tower module, a demisting tower, an activated carbon adsorption device and an exhaust funnel, the packing absorption tower module comprises a plurality of packing absorption towers, and any two adjacent packing absorption towers are connected through a first connecting air pipe; the filler absorption tower module is used for preliminarily removing malodorous substances in the waste gas; the packing absorption tower module is further connected with a demisting tower through a first connecting air pipe, and the demisting tower is used for carrying out gas-liquid separation on the waste gas treated by the packing absorption tower module so as to remove water vapor in the waste gas; the demisting tower is connected with an activated carbon adsorption device through a second connecting air pipe, and the activated carbon adsorption device is used for secondarily removing malodorous substances which are not completely treated at the front end; the end, away from the demisting tower, of the activated carbon adsorption device is connected with an induced draft fan, the induced draft fan is connected with the exhaust funnel through a third connecting air pipe, and waste gas can be conveyed into the exhaust funnel through the induced draft fan to be discharged after reaching the standard.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a lithium precipitation malodorous waste gas treatment system. Background Art

[0002] During the battery disassembly and recycling process, there is a lithium precipitation process. During the operation of this process, a certain amount of waste gas will be generated. The main components of this waste gas are acid mist and a small amount of organic matter, and it has a strong odor.

[0003] This type of waste gas has a great impact on the workshop operating environment and the surrounding environment, but there is currently no targeted waste gas treatment process; currently, most of the odorous waste gas from lithium precipitation is treated with a single acid-base spray before discharge, but the existing single process cannot completely remove the odor; therefore, according to the waste gas composition generated by this industry, it is necessary to design a corresponding waste gas treatment process in a targeted manner;

[0004] In addition, some existing waste gas purification devices cannot meet the waste gas treatment needs well due to their unreasonable structural design, and the waste gas that is not thoroughly treated will still cause great harm to environmental pollution; for example, the existing purification tower equipment reacts with the waste gas by adding chemicals, and then directly discharges the waste gas through the exhaust pipe, but does not clean the residual chemicals in the waste gas. When the part of the chemicals used for the reaction is not fully treated and is discharged with the waste gas, it will cause secondary pollution; therefore, it is necessary to develop a new waste gas treatment system with reasonable procedures, easy operation, and low investment and operating costs.

[0005] It can be seen that in response to the problems existing in the existing technology, there is an urgent need for a lithium precipitation odorous waste gas treatment system that can carry out targeted treatment of the main components in the lithium precipitation odorous waste gas and improve the waste gas treatment efficiency; at the same time, it is also necessary to reasonably plan and set up the waste gas treatment equipment to further optimize the waste gas treatment process. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides a lithium precipitation odorous waste gas treatment system, and the lithium precipitation odorous waste gas treatment system of the present application includes a multi-stage packed absorption tower, wherein the packed absorption tower also includes an oxidation absorption tower, an alkali washing absorption tower and a water washing absorption tower; through the above-mentioned multi-stage seasoning absorption tower, while the waste gas is treated in a targeted manner, the residual agents in the waste gas can be further cleaned to prevent pollution and harm to the environment, thereby improving the waste gas treatment efficiency and reducing the system operation cost; the lithium precipitation odorous waste gas treatment system of the present application also includes a defog tower and an activated carbon adsorption device, which can further perform secondary treatment on the odorous substances in the waste gas, further improving the treatment efficiency of the odorous waste gas; the lithium precipitation odorous waste gas treatment system of the present application ensures that the waste gas can stably meet the relevant national standards for a long time after being treated by the equipment.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a lithium sedimentation odorous waste gas treatment system, including a packing absorption tower module, a demisting tower, an activated carbon adsorption device, and an exhaust pipe;

[0008] The packed absorption tower module includes a plurality of packed absorption towers, and any two adjacent packed absorption towers are connected via a first connecting air duct; the packed absorption tower module is used to preliminarily remove odorous substances in the exhaust gas;

[0009] The packed absorption tower module is also connected to a defogger through a first connecting air duct, and the defogger is used to perform gas-liquid separation on the waste gas treated by the packed absorption tower module to remove water vapor in the waste gas;

[0010] The demisting tower is connected to an activated carbon adsorption device through a second connecting air duct, and the activated carbon adsorption device is used to perform secondary removal of odorous substances that have not been completely treated at the front end;

[0011] The end of the activated carbon adsorption device away from the defogger is connected to an induced draft fan, and the induced draft fan is connected to the exhaust pipe through a third connecting air duct. The induced draft fan can transport the exhaust gas to the exhaust pipe for emission that meets the standards.

[0012] Preferably, the packed absorption tower module comprises a primary packed absorption tower, a secondary packed absorption tower, and a tertiary packed absorption tower; the primary packed absorption tower is an oxidation absorption tower, the secondary packed absorption tower is an alkali washing absorption tower, and the tertiary packed absorption tower is a water washing absorption tower;

[0013] The first-stage packed absorption tower, the second-stage packed absorption tower and the third-stage packed absorption tower all have the same packed absorption tower structure.

[0014] Preferably, the outer sides of the first-stage packed absorption tower, the second-stage packed absorption tower and the third-stage packed absorption tower are all connected to circulating water pumps.

[0015] Preferably, the packed absorption tower structure includes a first air outlet, a first manhole sight glass, a first wire mesh defogger, a first packed defogger, a packed absorption device, a first shell, an overflow port, a first drain port, a liquid level gauge port, a PH port, a water replenishment port, a dosing port, a circulating water tank, a first air inlet, and a circulating water pump inlet;

[0016] A first air outlet is provided on the top of the first shell, and a first air inlet is provided on one side of the first shell near the bottom, and the first air outlet can be connected to the first air inlet of the adjacent packed absorption tower through a first connecting air duct;

[0017] The packing absorption device is arranged inside the first shell, and a first wire mesh demisting device and a first packing demisting device are arranged between the packing absorption device and the first air outlet, and the first wire mesh demisting device is located above the first packing demisting device, and the first packing demisting device adopts a Φ38 multi-faceted hollow ball;

[0018] The side of the first shell is provided with a plurality of first manhole sight glasses for observing the situation inside the tower;

[0019] A circulating water tank is provided on one side of the first shell, and the bottom of the first shell is connected to the circulating water tank. A circulating water pump water inlet is provided on the circulating water tank, and the circulating water tank is connected to the circulating water pump through the circulating water pump water inlet; the circulating water tank is also provided with a water replenishment port for adding water, a dosing port for adding a medicament, and a pH port for inserting a pH meter, and the pH port is arranged at an angle of 45°;

[0020] An overflow port, a first drain port, and a liquid level gauge port are provided on the outer side of the first shell near the bottom, and the first drain port is located below the overflow port.

[0021] Preferably, the filler absorption device comprises at least two filler absorption modules stacked one above the other, and the filler absorption module comprises a spray system, a filler layer, and a first support plate for supporting the filler layer;

[0022] The spray system is located above the packing layer, and a first support plate is provided below the packing layer; the packing layer adopts Φ50 polyhedral hollow balls; the spray system includes a spray pipe and a plurality of spiral nozzles;

[0023] The water outlet of the circulating water pump is communicated with the spray system.

[0024] Preferably, the defog tower includes a second air outlet, a second manhole sight glass, a second wire mesh defogger, a second filler defogger, a second support plate, a second air inlet, a second shell, and a second drain outlet;

[0025] A second air outlet is provided on the top of the second shell, a second air inlet is provided on one side of the second shell near the bottom, the second air inlet is connected to the three-stage filler absorption tower through a first connecting air duct, and the second air outlet is connected to the activated carbon adsorption device through a second connecting air duct;

[0026] The side of the second shell is provided with a plurality of second manhole sight glasses for observing the situation inside the tower;

[0027] A second wire mesh demisting device and a second filler demisting device are provided in the second housing. The second wire mesh demisting device is located above the second filler demisting device. The second filler demisting device uses a Φ38 multi-faceted hollow ball. A second support plate for support is provided below the second filler demisting device.

[0028] A second drain port is provided on one side of the second shell near the bottom.

[0029] Preferably, an arc-shaped curved pipe is provided at the second air inlet.

[0030] Preferably, the activated carbon adsorption device includes a third air inlet, an activated carbon filling port, a third air outlet, an activated carbon support orifice plate, a spray device, an activated carbon discharge port, a support column foot, a third shell, a third drain port, and a temperature sensor interface;

[0031] A third air inlet is provided at one end of the third shell, and a third air outlet is provided at the other end of the third shell. The third air inlet is connected to the defogger tower through a second connecting air duct, and the third air outlet is connected to the induced draft fan;

[0032] The top of the third shell is provided with an activated carbon filling port, and the bottom of the third shell is provided with an activated carbon discharge port; an activated carbon supporting orifice plate is provided inside the third shell;

[0033] A spray device is provided near the top of the third shell, and the spray device includes a spray pipe and a plurality of spiral nozzles;

[0034] A supporting column foot is also provided at the bottom of the third shell; a third drain port is provided on one side of the third shell; and a temperature sensor interface is provided at a position near the top of the outer side of the third shell.

[0035] Preferably, the front section of the spray device is provided with an electric valve for opening the spray device.

[0036] Preferably, a protection frame for protecting the exhaust chimney is provided outside the exhaust chimney.

[0037] The malodorous waste gas from lithium precipitation collected by the lithium precipitation malodorous waste gas treatment system of the present application enters a primary packing absorption tower (i.e., an oxidation absorption tower), and the strong oxidant in the oxidation absorption tower can oxidize the malodorous substances into acidic small molecular substances; then the inorganic malodorous gas enters a secondary packing absorption tower (i.e., an alkali washing absorption tower), and the acid-soluble substances in the waste gas and the small molecular organic acids generated after oxidation are absorbed by alkali washing; the waste gas passing through the alkali washing absorption tower then enters a tertiary packing absorption tower (i.e., a water washing absorption tower), and then the residual reagents after the waste gas passes through the oxidation absorption tower and the alkali washing absorption tower are removed by water washing to prevent pollution and harm to the environment; then The waste gas is passed into the demister for gas-liquid separation to further remove water vapor in the waste gas; the waste gas passing through the demister then enters the activated carbon adsorption device, and the odorous substances that could not be treated at the front end are removed for a second time; the waste gas treated by the activated carbon adsorption device is sent to the 25m exhaust chimney through the induced draft fan to meet the emission standards; the absorption liquid in the packed absorption tower can be circulated by a circulating water pump, and the waste gas passed into the packed absorption tower is repeatedly treated until the absorption liquid is fully saturated, and finally the fully saturated absorption liquid is discharged into the sewage pool regulating tank for harmless treatment; the activated carbon in the activated carbon adsorption device is disposable, that is, all the activated carbon is replaced after adsorption saturation.

[0038] The oxidant used in the oxidation absorption tower is a sodium hypochlorite solution with a concentration of 10%; the alkali night used in the alkali washing absorption tower is a sodium hydroxide solution with a concentration of 30%;

[0039] Among them, the interior of the first-stage, second-stage and third-stage packed absorption towers are all equipped with packing support plates, and the packing is placed on the support plates in a random or integral manner. The absorption liquid is sprayed onto the packing from the spray system on the top of the tower and flows down along the surface of the packing. The gas enters from the second air inlet at the bottom of the tower. The gas is in a countercurrent state relative to the absorption liquid and continuously passes through the gaps in the packing. On the surface of the packing, the gas and liquid are in close contact for mass transfer. The first-stage, second-stage and third-stage packed absorption towers are all provided with two sets of demisters near the outlet, one set of packing demisters and one set of wire mesh demisters.

[0040] Among them, in order to facilitate timely replenishment of medicines, the first-level, second-level and third-level packed absorption towers are provided with a dosing port on one side of the tower body, the dosing port is connected to the circulating water tank, and an automatic dosing device is provided.

[0041] Among them, in order to facilitate timely replenishment of circulating water, the first-level, second-level and third-level packed absorption towers are provided with a water replenishment port on one side of the tower body, the water replenishment port is connected to the circulating water tank, and an automatic water replenishment device is provided.

[0042] Among them, in order to facilitate the timely discharge of circulating water, the first-level, second-level and third-level packed absorption towers are provided with a drain outlet on one side of the tower body, the drain outlet is connected to the circulating water tank, and an automatic drainage device is provided.

[0043] Among them, in order to facilitate the replacement of packing, the first-level, second-level and third-level packed absorption towers are provided with a packing feed port and a packing discharge port on the top of the tower body; the packing feed port is arranged directly above the packing area, and the packing discharge port is on the side of the packing area.

[0044] The absorption liquid in the primary, secondary and tertiary packed absorption towers is recycled through a circulating pump, and the reagents and water are recycled to save resources. When the reagent absorption liquid is saturated, it can pass through the waste gas discharge device and then enter the sewage pool regulating tank for treatment, ensuring the efficient operation of the treatment system.

[0045] The demisting tower is equipped with a packing support plate inside, and the packing is placed on the support plate in a random or neat manner. There is a wire mesh above the packing, and there is a pressure plate above the wire mesh. The gas enters from the bottom of the tower, and the water vapor in the gas is removed by the two sets of demisting devices, the packing and the wire mesh.

[0046] The activated carbon adsorption device is equipped with an activated carbon support plate, and the activated carbon fills the entire activated carbon filling area. The gas enters from the third air inlet, and after being adsorbed by the activated carbon, it goes out from both sides to the third air outlet 23 located at the right end of the tower body;

[0047] Wherein, for fire safety, the activated carbon adsorption device further installs a temperature sensor in the activated carbon layer, further installs a spray system above the activated carbon, and presets the automatic spray temperature;

[0048] The utility model discloses a lithium deposition malodorous waste gas treatment system, which can improve the resource recovery rate, ensure the waste gas treatment effect, and has good economic and environmental benefits.

[0049] Compared with the prior art, the utility model has the following beneficial effects:

[0050] 1. A lithium precipitation odorous waste gas treatment system of the present application includes a multi-stage packed absorption tower, wherein the packed absorption tower also includes an oxidation absorption tower, an alkali washing absorption tower and a water washing absorption tower; while the waste gas is treated in a targeted manner through the above-mentioned multi-stage seasoning absorption tower, residual agents in the waste gas can be further cleaned to prevent pollution and harm to the environment, thereby improving the waste gas treatment efficiency and reducing the system operation cost; the lithium precipitation odorous waste gas treatment system of the present application also includes a defog tower and an activated carbon adsorption device, which can further perform secondary treatment on odorous substances in the waste gas, further improving the treatment efficiency of the odorous waste gas; a lithium precipitation odorous waste gas treatment system of the present application ensures that the waste gas can stably meet the relevant national standards for a long time after being treated by the equipment.

[0051] 2. The utility model is a lithium precipitation odorous waste gas treatment system, which can improve the resource recovery rate, ensure the waste gas treatment effect, and has good economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 This is a schematic diagram of the planar structure of a lithium deposition odorous waste gas treatment system of the utility model;

[0054] Figure 2 It is a plan view of the packed absorption tower structure of the utility model;

[0055] Figure 3 It is a schematic diagram of the planar structure of the demisting tower of the utility model;

[0056] Figure 4 It is a schematic diagram of the planar structure of the activated carbon adsorption device of the utility model;

[0057] As shown in the figure: exhaust pipe 1, activated carbon adsorption device 2, third air inlet 21, activated carbon filling port 22, third air outlet 23, activated carbon support orifice plate 24, spray device 25, activated carbon discharge port 27, support column foot 28, third shell 29, third drain port 210, temperature sensor interface 211, defog tower 3, second air outlet 31, second manhole sight glass 32, second wire mesh defog device 33, second filler defog device 34, second support plate 35, second air inlet 36, second shell 37, second drain port 38, first connecting air duct 4, second connecting air duct Tube 5, induced draft fan 6, third connecting air duct 7, primary packed absorption tower 8, first air outlet 81, first manhole sight glass 82, first wire mesh defogger 83, first packed defogger 84, packed absorption device, first shell 85, overflow port 86, first drain port 87, liquid level meter port 88, PH port 89, water replenishment port 90, dosing port 91, circulating water tank 92, first air inlet 93, circulating water pump inlet 94, spray system 95, packing layer 96, first support plate 97, secondary packed absorption tower 9, tertiary packed absorption tower 10, circulating water pump 11, protective frame 12. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0059] Embodiment 1

[0060] like Figure 1-4 As shown, this embodiment proposes a lithium deposition odor waste gas treatment system, including a packed absorption tower module, a demister tower 3, an activated carbon adsorption device 2, and an exhaust pipe 1;

[0061] The packed absorption tower module includes a plurality of packed absorption towers, and any two adjacent packed absorption towers are connected via a first connecting air duct 4; the packed absorption tower module is used to preliminarily remove odorous substances in the exhaust gas;

[0062] The packed absorption tower module is also connected to the demister tower 3 through the first connecting air duct 4, and the demister tower 3 is used to perform gas-liquid separation on the waste gas treated by the packed absorption tower module to remove water vapor in the waste gas;

[0063] The demisting tower 3 is connected to the activated carbon adsorption device 2 through the second connecting air duct 5, and the activated carbon adsorption device 2 is used to perform secondary removal of odorous substances that have not been completely treated at the front end;

[0064] The end of the activated carbon adsorption device 2 away from the defogger 3 is connected to the induced draft fan 6, and the induced draft fan 6 is connected to the exhaust pipe 1 through the third connecting air duct 7. The induced draft fan 6 can transport the exhaust gas to the exhaust pipe 1 for emission that meets the standards.

[0065] like Figure 1 As shown, the packed absorption tower module includes a primary packed absorption tower 8, a secondary packed absorption tower 9, and a tertiary packed absorption tower 10; the primary packed absorption tower 8 is an oxidation absorption tower, the secondary packed absorption tower 9 is an alkali washing absorption tower, and the tertiary packed absorption tower 10 is a water washing absorption tower;

[0066] The first-stage packed absorption tower 8 , the second-stage packed absorption tower 9 , and the third-stage packed absorption tower 10 all have the same packed absorption tower structure.

[0067] The outer sides of the primary packed absorption tower 8 , the secondary packed absorption tower 9 , and the tertiary packed absorption tower 10 are all connected with a circulating water pump 11 .

[0068] like Figure 2 As shown, the packed absorption tower structure includes a first air outlet 81, a first manhole sight glass 82, a first wire mesh defogger 83, a first packing defogger 84, a packing absorption device, a first shell 85, an overflow port 86, a first drain port 87, a liquid level meter port 88, a PH port 89, a water replenishment port 90, a dosing port 91, a circulating water tank 92, a first air inlet 93, and a circulating water pump inlet 94;

[0069] A first air outlet 81 is provided at the top of the first shell 85, and a first air inlet 93 is provided at one side of the first shell 85 near the bottom, and the first air outlet 81 can be connected to the first air inlet 93 of the adjacent packing absorption tower through the first connecting air duct 4;

[0070] The packing absorption device is arranged inside the first shell 85, and a first wire mesh demisting device 83 and a first packing demisting device 84 are arranged between the packing absorption device and the first air outlet 81, and the first wire mesh demisting device 83 is located above the first packing demisting device 84, and the first packing demisting device 84 adopts a polyhedral hollow ball of Φ38;

[0071] The side of the first shell 85 is provided with a plurality of first manhole mirrors 82 for observing the situation inside the tower;

[0072] A circulating water tank 92 is provided on one side of the first shell 85, and the bottom of the first shell 85 is connected to the circulating water tank 92. A circulating water pump water inlet 94 is provided on the circulating water tank 92, and the circulating water tank 92 is connected to the circulating water pump 11 through the circulating water pump water inlet 94; the circulating water tank 92 is also provided with a water replenishment port 90 for adding water, a dosing port 91 for adding a medicament, and a pH port 89 for inserting a pH meter, and the pH port 89 is arranged at an angle of 45°;

[0073] An overflow port 86 , a first drain port 87 , and a liquid level gauge port 88 are provided on the outside of the first shell 85 near the bottom. The first drain port 87 is located below the overflow port 86 .

[0074] The filler absorption device comprises at least two filler absorption modules stacked one above the other, and the filler absorption module comprises a spray system 95, a filler layer 96, and a first support plate 97 for supporting the filler layer 96;

[0075] The spray system 95 is located above the packing layer 96, and a first support plate 97 is provided below the packing layer 96; the packing layer 96 is made of Φ50 polyhedral hollow balls; the spray system 95 includes a spray pipe and a plurality of spiral nozzles;

[0076] The water outlet of the circulating water pump 11 is communicated with the spray system 95 .

[0077] When each stage of the packed absorption tower of this embodiment is working, gas is fed in through the first air inlet 93, and liquid is sprayed onto the packing through the spray system 95 and flows down along the surface of the packing; the exhaust gas and liquid continuously pass through the gaps of the packing layer 96 in countercurrent; on the surface of the packing, the gas and liquid are in close contact for mass transfer; the gas after the absorption operation is sent out of the packed absorption tower through the first air outlet 81.

[0078] Among them, the first wire mesh demisting device 83 and the first filler demisting device 84 play a role in reducing the influence of the tiny particles brought up during the working process on the normal working process.

[0079] When the liquid flows downward along the packing layer 96 , it tends to gradually concentrate toward the tower wall, causing the liquid flow rate near the tower wall to gradually increase. The liquid flowing down from the upper packing is collected and sent to the circulating water tank 92 , and then sent to the spraying system 95 through the circulating water tank 92 to be sprayed onto the packing layer 96 .

[0080] The first manhole sight glass 82 can be used to monitor the working conditions in the packed absorption tower in real time to ensure that the work can proceed smoothly.

[0081] In order to facilitate timely replenishment of the reagent, a dosing port 91 and a pH port 89 are provided on one side of the circulating water tank 92. The dosing port 91 is connected to the circulating water tank 92. The pH port 89 is a 45° inclined port for obliquely inserting the pH meter into the circulating liquid.

[0082] In order to replenish the circulating water in time, a water replenishment port 90 is provided on one side of the circulating water tank 92 , and the water replenishment port 90 is connected to the circulating water tank 92 .

[0083] In order to discharge the circulating water in time, a first drain port 87 is provided on one side of the tower body 8 , and the first drain port 87 is connected to the circulating water tank 92 .

[0084] like Figure 3 As shown, the defog tower 3 includes a second air outlet 31, a second manhole mirror 32, a second wire mesh defogger 33, a second filler defogger 34, a second support plate 35, a second air inlet 36, a second shell 37, and a second drain 38;

[0085] A second air outlet 31 is provided on the top of the second shell 37, and a second air inlet 36 is provided on one side of the second shell 37 near the bottom. The second air inlet 36 is connected to the three-stage packing absorption tower 10 through the first connecting air duct 4, and the second air outlet 31 is connected to the activated carbon adsorption device 2 through the second connecting air duct 5;

[0086] The side of the second shell 37 is provided with a plurality of second manhole mirrors 32 for observing the situation inside the tower;

[0087] A second wire mesh demister 33 and a second filler demister 34 are provided in the second housing 37. The second wire mesh demister 33 is located above the second filler demister 34. The second filler demister 34 uses a polyhedral hollow ball of Φ38. A second support plate 35 for support is provided below the second filler demister 34.

[0088] A second drain port 38 is provided on one side of the second shell 37 near the bottom.

[0089] The second air inlet 36 is provided with an arc-shaped curved pipe.

[0090] In order to better remove water vapor in the exhaust gas, a second air inlet 36 on a side of the second shell 37 is provided with a curved pipe facing the bottom plate of the tower body, which is countercurrent to the airflow direction; for the convenience of observation and maintenance, a second manhole sight glass 32 is provided on a side of the second shell 37 and on the top of the second shell 37; in order to facilitate the discharge of water in the tower, a second drain outlet 38 is provided near the bottom of the second shell 37.

[0091] like Figure 4 As shown, the activated carbon adsorption device 2 includes a third air inlet 21, an activated carbon filling port 22, a third air outlet 23, an activated carbon support orifice plate 24, a spray device 25, an activated carbon discharge port 27, a support column foot 28, a third shell 29, a third drain port 210, and a temperature sensor interface 211;

[0092] A third air inlet 21 is provided at one end of the third shell 29, and a third air outlet 23 is provided at the other end of the third shell 29. The third air inlet 21 is connected to the defogger 3 through the second connecting air duct 5, and the third air outlet 23 is connected to the induced draft fan 6.

[0093] The top of the third shell 29 is provided with an activated carbon filling port 22, and the bottom of the third shell 29 is provided with an activated carbon discharge port 27; the third shell 29 is provided with an activated carbon supporting orifice plate 24;

[0094] A spray device 25 is provided near the top of the third housing 29, and the spray device 25 includes a spray pipe and a plurality of spiral nozzles;

[0095] A supporting column foot 28 is further provided at the bottom of the third shell 29 ; a third drain port 210 is provided on one side of the third shell 29 ; and a temperature sensor interface 211 is provided on the outer side of the third shell 29 near the top.

[0096] An electric valve for opening the spray device 25 is provided at the front section of the spray device 25 .

[0097] A third air inlet 21 is provided at one end of the activated carbon adsorption device 2, and the airflow enters the adsorption section in the middle of the activated carbon support orifice plate 24 from the middle to both sides; the waste gas after adsorption is discharged from the third air outlet 23; in order to more conveniently load activated carbon, an activated carbon loading port 22 is provided at the top of the third shell 29, and in order to more conveniently unload activated carbon, an activated carbon unloading port 27 is provided at the bottom of the third shell 29; for fire safety, a spray device 25 is provided above the activated carbon, and a temperature sensor is installed in the activated carbon, and the temperature sensor can be inserted from the temperature sensor interface 211, and an automatic spray system and an electric valve are provided. When the temperature is greater than 100°C, the valve is opened to start the spray device 25. In order to facilitate the discharge of internal water, a third drain port 210 is provided close to the bottom of the third shell 29; in order to facilitate the loading and unloading of activated carbon, an 800mm support column foot 28 is provided at the bottom of the third shell 29.

[0098] A protection frame 12 for protecting the exhaust pipe 1 is disposed outside the exhaust pipe 1 .

[0099] A method of using the lithium deposition odorous waste gas treatment system of this embodiment is as follows:

[0100] Step 1: The collected malodorous gas is passed into a primary packed absorption tower 8 (i.e., an oxidation absorption tower), and a strong oxidant in the oxidation absorption tower oxidizes the malodorous substances into acidic small molecular substances;

[0101] Step 2: The inorganic odorous gas then enters the secondary packed absorption tower 9 (i.e., the alkali washing absorption tower), and the acid-soluble substances in the waste gas and the small molecular organic acid generated after the waste gas is oxidized in step 1 are further absorbed by alkali washing;

[0102] Step 3: the waste gas after the alkali washing absorption tower enters the three-stage packed absorption tower 10 (i.e., the water washing absorption tower), and the residual reagents after the waste gas passes through step 1 and step 2 are removed by water washing;

[0103] Step 4: passing the exhaust gas through the first connecting air duct 4 into the demisting tower 3 for gas-liquid separation to remove water vapor in the exhaust gas;

[0104] Step 5: The exhaust gas after passing through the demister 3 enters the activated carbon adsorption device 2 through the second connecting air duct 5 to further remove the odorous substances that have not been completely treated by the front-end equipment;

[0105] Step 6: The waste gas treated by the activated carbon adsorption device 2 is sent to the 25m exhaust chimney 1 through the induced draft fan 7 to meet the emission standards;

[0106] Step 7: The absorption liquid in each level of the packed absorption tower can be circulated by the circulating water pump 11, and the waste gas introduced into the packed absorption tower is repeatedly treated until the absorption liquid is fully saturated, and finally the fully saturated absorption liquid is discharged into the sewage tank regulating tank for harmless treatment.

[0107] Wherein, the oxidant added to the oxidation absorption tower in step 1 is a sodium hypochlorite solution with a concentration of 10%; the alkaline washing absorption night added to the alkaline washing absorption tower in step 2 is a sodium hydroxide solution with a concentration of 30%;

[0108] The packed absorption towers described in step 1, step 2, and step 3 are all equipped with a first support plate 97, and the packing is placed on the first support plate 97 in a random or neat manner. The liquid is sprayed from the top spray system 95 onto the packing in the packing layer 96 and flows down along the surface of the packing. The exhaust gas enters from the first air inlet 93 at the bottom of the tower. The exhaust gas is in a countercurrent state relative to the liquid and continuously passes through the gaps in the packing. On the surface of the packing, the gas-liquid two phases are in close contact for mass transfer. Two sets of defoggers are provided near the first air outlet 81 of each level of the packed absorption tower, one set of packed defogger 84 and one set of wire mesh defogger 83.

[0109] In order to facilitate timely replenishment of reagents, the packed absorption tower described in step 1, step 2, and step 3 is provided with a dosing port 91 on one side of the tower body. The dosing port 91 is connected to a circulating water tank 92 and an automatic dosing device is provided.

[0110] In order to facilitate timely replenishment of circulating water, the packed absorption tower described in step 1, step 2, and step 3 is provided with a water replenishment port 90 on one side of the tower body. The water replenishment port 90 is connected to the circulating water tank 92, and an automatic water replenishment device is provided.

[0111] In order to facilitate the timely discharge of circulating water, the packed absorption tower described in step 1, step 2 and step 3 is provided with a first drain port 87 on one side of the tower body. The first drain port 87 is connected to the circulating water tank 92 and an automatic drain device is provided.

[0112] To facilitate the replacement of packing, the packed absorption tower described in step 1, step 2 and step 3 is provided with a packing feed port and a packing discharge port on the top of the tower body; the packing feed port is arranged directly above the packing area, and the packing discharge port is arranged on the side of the packing area.

[0113] The absorption liquid in the packed absorption tower described in step 1, step 2, and step 3 is recycled through the circulating water pump 11, and resources are saved by recycling the reagents and water. When the reagent absorption liquid is saturated, it can pass through the waste gas discharge device and then enter the sewage pool regulating tank for treatment, ensuring the efficient operation of the treatment system.

[0114] The demisting tower 3 described in step 4 is internally provided with a second support plate 35, on which the fillers are placed in a random or neat manner, above the fillers is a wire mesh, above the wire mesh is a pressure plate, and the gas enters from the lower part of the tower, and the water vapor in the gas is removed by two sets of demisting devices, the fillers and the wire mesh.

[0115] The activated carbon adsorption device 2 described in step 5 is internally provided with an activated carbon support orifice plate 24, and the activated carbon fills the entire activated carbon filling area. The gas enters from the third air inlet 21, and after being adsorbed by the activated carbon, it goes out from both sides to the third air outlet 23 located at the right end of the tower body;

[0116] For fire safety, the activated carbon adsorption device described in step 5 is equipped with a temperature sensor in the activated carbon layer, and the temperature sensor can be inserted through the temperature sensor interface 211; a spray device 25 is installed above the activated carbon, and the automatic spray temperature is preset.

[0117] A lithium deposition malodorous waste gas treatment system of this embodiment can improve the resource recovery rate, ensure the waste gas treatment effect, and has good economic and environmental benefits.

[0118] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0119] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A lithium precipitation odorous waste gas treatment system, characterized in that: It comprises a packed absorption tower module, a demister tower (3), an activated carbon adsorption device (2), and an exhaust pipe (1); The packed absorption tower module comprises a plurality of packed absorption towers, and any two adjacent packed absorption towers are connected via a first connecting air duct (4); the packed absorption tower module is used for preliminarily removing odorous substances in the exhaust gas; The packed absorption tower module is also connected to a demister tower (3) via a first connecting air duct (4), and the demister tower (3) is used to perform gas-liquid separation on the waste gas treated by the packed absorption tower module, so as to remove water vapor in the waste gas; The demisting tower (3) is connected to the activated carbon adsorption device (2) via a second connecting air duct (5), and the activated carbon adsorption device (2) is used to perform secondary removal of odorous substances that have not been completely treated at the front end; One end of the activated carbon adsorption device (2) away from the defogger (3) is connected to an induced draft fan (6), and the induced draft fan (6) is connected to the exhaust pipe (1) via a third connecting air duct (7). The induced draft fan (6) can transport the waste gas to the exhaust pipe (1) for emission in compliance with the standards.

2. A lithium ion odorous waste gas treatment system according to claim 1, characterized in that: The packed absorption tower module comprises a primary packed absorption tower (8), a secondary packed absorption tower (9), and a tertiary packed absorption tower (10); the primary packed absorption tower (8) is an oxidation absorption tower, the secondary packed absorption tower (9) is an alkali washing absorption tower, and the tertiary packed absorption tower (10) is a water washing absorption tower; The first-stage packed absorption tower (8), the second-stage packed absorption tower (9), and the third-stage packed absorption tower (10) all have the same packed absorption tower structure.

3. A lithium smelting waste gas treatment system according to claim 2, characterized in that: The outer sides of the first-stage packed absorption tower (8), the second-stage packed absorption tower (9), and the third-stage packed absorption tower (10) are all connected to a circulating water pump (11).

4. A lithium sludge waste gas treatment system according to claim 3, characterized in that: The packed absorption tower structure comprises a first air outlet (81), a first manhole sight glass (82), a first wire mesh demisting device (83), a first packed demisting device (84), a packed absorption device, a first shell (85), an overflow port (86), a first drain port (87), a liquid level meter port (88), a pH port (89), a water replenishment port (90), a drug addition port (91), a circulating water tank (92), a first air inlet (93), and a circulating water pump water inlet (94); A first air outlet (81) is provided at the top of the first shell (85), a first air inlet (93) is provided at a position close to the bottom of one side of the first shell (85), and the first air outlet (81) can be connected to the first air inlet (93) of an adjacent packing absorption tower through a first connecting air duct (4); The filler absorption device is arranged inside the first shell (85), and a first wire mesh demisting device (83) and a first filler demisting device (84) are arranged between the filler absorption device and the first air outlet (81), and the first wire mesh demisting device (83) is located above the first filler demisting device (84), and the first filler demisting device (84) adopts a Φ38 multi-faceted hollow ball; The side of the first shell (85) is provided with a plurality of first manhole mirrors (82) for observing the situation inside the tower; A circulating water tank (92) is provided on one side of the first shell (85), and the bottom of the first shell (85) is in communication with the circulating water tank (92). A circulating water pump water inlet (94) is provided on the circulating water tank (92), and the circulating water tank (92) is connected to the circulating water pump (11) via the circulating water pump water inlet (94). The circulating water tank (92) is also provided with a water replenishment port (90) for adding water, a drug addition port (91) for adding a drug, and a pH port (89) for inserting a pH meter, and the pH port (89) is arranged at an angle of 45°. An overflow port (86), a first drain port (87), and a liquid level gauge port (88) are provided on the outside of the first shell (85) near the bottom, and the first drain port (87) is located below the overflow port (86).

5. A lithium sludge waste gas treatment system according to claim 4, characterized in that: The filler absorption device comprises at least two filler absorption modules stacked one above the other, and the filler absorption module comprises a spray system (95), a filler layer (96), and a first support plate (97) for supporting the filler layer (96); The spray system (95) is located above the packing layer (96), and a first support plate (97) is provided below the packing layer (96); the packing layer (96) is made of Φ50 polyhedral hollow balls; the spray system (95) comprises a spray pipe and a plurality of spiral nozzles; The water outlet of the circulating water pump (11) is communicated with the spray system (95).

6. A lithium sludge waste gas treatment system according to claim 2, characterized in that: The demisting tower (3) comprises a second air outlet (31), a second manhole sight glass (32), a second wire mesh demisting device (33), a second filler demisting device (34), a second support plate (35), a second air inlet (36), a second shell (37), and a second drain outlet (38); A second air outlet (31) is provided at the top of the second shell (37), and a second air inlet (36) is provided at a position close to the bottom of one side of the second shell (37); the second air inlet (36) is connected to the three-stage filler absorption tower (10) via a first connecting air duct (4), and the second air outlet (31) is connected to the activated carbon adsorption device (2) via a second connecting air duct (5); The side of the second shell (37) is provided with a plurality of second manhole mirrors (32) for observing the situation inside the tower; A second wire mesh demisting device (33) and a second filler demisting device (34) are provided in the second shell (37); the second wire mesh demisting device (33) is located above the second filler demisting device (34); the second filler demisting device (34) uses a Φ38 multi-faceted hollow ball; a second support plate (35) for supporting is provided below the second filler demisting device (34); A second drain port (38) is provided on one side of the second shell (37) at a position close to the bottom.

7. A lithium sludge waste gas treatment system according to claim 6, characterized in that: An arc-shaped curved pipe is provided at the second air inlet (36).

8. A lithium deposition odorous waste gas treatment system according to claim 1, characterized in that: The activated carbon adsorption device (2) comprises a third air inlet (21), an activated carbon filling port (22), a third air outlet (23), an activated carbon supporting orifice plate (24), a spray device (25), an activated carbon discharge port (27), a supporting column foot (28), a third shell (29), a third drain port (210), and a temperature sensor interface (211); A third air inlet (21) is provided at one end of the third shell (29), and a third air outlet (23) is provided at the other end of the third shell (29); the third air inlet (21) is connected to the defogger tower (3) via a second connecting air duct (5), and the third air outlet (23) is connected to the induced draft fan (6); The top of the third shell (29) is provided with an activated carbon filling port (22), and the bottom of the third shell (29) is provided with an activated carbon discharge port (27); an activated carbon supporting orifice plate (24) is provided inside the third shell (29); A spray device (25) is provided near the top of the third shell (29), and the spray device (25) comprises a spray pipe and a plurality of spiral nozzles; The bottom of the third shell (29) is also provided with a supporting column foot (28); a third drain port (210) is provided on one side of the third shell (29); and a temperature sensor interface (211) is provided on the outside of the third shell (29) near the top.

9. A lithium-sinking malodorous waste gas treatment system according to claim 8, characterized in that: The front section of the spray device (25) is provided with an electric valve for opening the spray device (25).

10. A lithium deposition malodorous waste gas treatment system according to claim 1, characterized in that: A protection frame (12) for protecting the exhaust pipe (1) is provided outside the exhaust pipe (1).

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