Hydrogen-containing tail gas treatment device

Abstract

The utility model discloses a hydrogen-containing tail gas treatment device, which belongs to the technical field of lithium battery recovery tail gas treatment, and comprises a reaction kettle, a spray tower, an induced draft fan and an exhaust pipe, one side of the top end of the reaction kettle is provided with an induced draft port and a blower nozzle, the top end of the spray tower is provided with an air outlet, the side wall of the spray tower is provided with an air inlet, and the exhaust pipe is provided with an air outlet. The blower nozzle is communicated with the atmosphere, the air inducing port is communicated with the air inlet through a pipeline, the air outlet is communicated with the induced draft fan through a pipeline, and the induced draft fan is communicated with the exhaust pipe. According to the hydrogen-containing tail gas treatment device disclosed by the utility model, the hydrogen concentration in the hydrogen-containing tail gas is below 25% of the lower limit of hydrogen explosion concentration by adjusting the frequency of the induced draft fan, so that the direct discharge treatment of the hydrogen-containing tail gas can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery recovery tail gas treatment, and in particular relates to a hydrogen-containing tail gas treatment device. Background Art

[0002] Lithium-ion batteries have developed rapidly in recent years, especially in new energy vehicles. With the advent of the lithium-ion battery recycling boom, the lithium-ion battery recycling industry is bound to become more and more popular. The positive electrode material of lithium-ion batteries is coated on aluminum foil. The scrapped lithium-ion batteries are then discharged, crushed, screened and other processes to obtain lithium-ion battery recycling powder. Therefore, it is inevitable that some aluminum impurities will be contained in the battery recycling powder. This part of the impurities enters the acid leaching process together with the battery recycling powder and reacts with sulfuric acid to generate hydrogen. The flash point of hydrogen is extremely low and belongs to Class A substances. The area where hydrogen is produced should be set as a Class A explosion-proof area, and the fire zoning should be well divided to meet the requirements of fire protection distance and safe evacuation. Since hydrogen is not a pollutant, it can be discharged directly. However, the explosion range of hydrogen is very wide. How to safely discharge hydrogen-containing tail gas is one of the technical problems that need to be solved in this field. Utility Model Content

[0003] In view of this, the utility model provides a hydrogen-containing tail gas treatment device for solving the above-mentioned problem.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A hydrogen-containing tail gas treatment device comprises: a reactor, a spray tower, an induced draft fan and an exhaust pipe, wherein an induced draft port and an air blower are arranged on one side of the top of the reactor, an air outlet is arranged on the top of the spray tower, an air inlet is arranged on the side wall of the spray tower, the air blower is connected to the atmosphere, the induced draft port is connected to the air inlet pipeline, the air outlet is connected to the induced draft fan pipeline, and the induced draft fan is connected to the exhaust pipe.

[0006] Furthermore, a hydrogen concentration detector is provided on the pipeline connecting the air induced port and the air inlet, and the hydrogen concentration detector is electrically connected to the induced draft fan.

[0007] Furthermore, a hydrogen pipeline flame arrester is arranged at the top end of the exhaust pipe.

[0008] Furthermore, the reactor is also provided with a feeding port, and the feeding port is used to feed battery recovery powder into the reactor.

[0009] Furthermore, the spray tower is also provided with a demister, a spray system, a filling system and a dosing box. The demister is arranged at the top of the spray tower, the spray system is arranged in the middle of the spray tower, the filling system is located in the middle of the spray tower and below the spray system, the dosing box is arranged at the bottom of the spray tower, and the air inlet is connected to the dosing box.

[0010] Furthermore, an air inlet is arranged on the side wall of the exhaust pipe, an exhaust port is arranged on the top end, and the hydrogen pipeline flame arrester is arranged at the exhaust port.

[0011] Furthermore, a lightning rod is provided at the top of the exhaust port.

[0012] Furthermore, the induced draft fan is a variable frequency device.

[0013] Furthermore, the spray tower, the induced draft fan and the exhaust pipe are all made of stainless steel.

[0014] The beneficial effects of the utility model are:

[0015] 1) The utility model controls the air volume of the induced draft fan through the frequency of the induced draft fan, so that the hydrogen concentration in the hydrogen-containing tail gas is below 25% of the lower limit of the hydrogen explosion concentration, thereby realizing the direct discharge treatment of the hydrogen-containing tail gas;

[0016] 2) The spray tower, induced draft fan, exhaust pipe and connecting pipelines of each device of the utility model are all made of stainless steel, which can timely remove static electricity, prevent static electricity accumulation and increase safety;

[0017] 3) A hydrogen pipeline flame arrester is arranged on the top of the exhaust pipe of the utility model to prevent the fire source outside the system from flowing back into the system and causing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a hydrogen-containing tail gas treatment device;

[0020] Figure 2 yes Figure 1 A magnified view of middle;

[0021] Among them, in the figure:

[0022] 1-reactor, 11-feeding port, 12-induction air port, 13-air blast port, 2-spray tower, 21-air outlet, 22-demister, 23-spray system, 24-filling system, 25-dosage box, 26-air inlet, 3-induction draft fan, 4-exhaust pipe, 41-lightning rod, 42-exhaust port, 43-hydrogen pipeline flame arrester, 44-air inlet, 5-hydrogen concentration detector. DETAILED DESCRIPTION

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

[0024] Refer to the attached Figure 1-2 As shown, the utility model provides a hydrogen-containing tail gas treatment device, comprising: a reactor 1, a spray tower 2, an induced draft fan 3 and an exhaust pipe 4; an induced draft port 12 and an air blast port 13 are arranged on one side of the top of the reactor 1, an air outlet 21 is arranged on the top of the spray tower 2, an air inlet 26 is arranged on the side wall of the spray tower 2, the air blast port 13 is connected to the atmosphere, the induced draft port 12 is connected to the air inlet 26 by pipeline, the air outlet 21 is connected to the induced draft fan 3 by pipeline, the induced draft fan 3 is connected to the exhaust pipe 4, wherein the induced draft fan 3 is Frequency conversion equipment; the spray tower 2, the induced draft fan 3 and the exhaust pipe 4 are all made of stainless steel, and the flange positions where the spray tower 2, the induced draft fan 3 and the exhaust pipe 4 are connected are electrostatically bridged; a hydrogen concentration detector 5 is provided on the pipeline connecting the induced draft port 12 and the air inlet 26, and the hydrogen concentration detector 5 is electrically connected to the induced draft fan 3. The hydrogen concentration detector 5 controls the induced draft volume of the induced draft fan 3 by adjusting the frequency of the induced draft fan 3, and then controls the hydrogen concentration in the hydrogen-containing tail gas to be below 25% of the lower limit of the hydrogen explosion concentration. A hydrogen pipeline flame arrester 43 is provided at the top of the exhaust pipe 4, which effectively avoids the risk of explosion caused by the backfire of the fire source outside the system into the system.

[0025] The reactor 1 is also provided with a feeding port 11 , which is used to feed battery recovery powder into the reactor 1 .

[0026] The spray tower 2 is also provided with a demister 22, a spray system 23, a filling system 24 and a dosing box 25. The demister 22 is arranged at the top of the spray tower 2, and the spray system 23 is arranged in the middle of the spray tower 2. The spray system 23 includes a spray pipe, a nozzle and a circulation pump; the filling system 24 is located in the middle of the spray tower 2 and below the spray system 23. The filling system 24 includes a filler and a filler support plate; the dosing box 25 is arranged at the bottom of the spray tower 2, and the dosing box 25 includes a liquid level meter, a water tank, a dosing port and a sewage outlet. The spray system 23, the filling system 24 and the dosing box 25 are all conventional settings, which will not be described in detail here; the air inlet 26 is connected to the dosing box 25. The hydrogen-containing tail gas generated in the reactor 1 passes upward through the air inlet 26 and sequentially passes through the dosing box 25, the filling system 24, the spray system 23 and the demister 22 to treat other impurity gases in the hydrogen-containing tail gas. After treatment, only the hydrogen-containing tail gas is discharged through the air outlet 21 and the exhaust pipe 4. Figure 1 Two groups of spray systems 23 and packing systems 24 are arranged in sequence from top to bottom in the middle of the spray tower 2. In actual use, the number of spray systems 23 and packing systems 24 can be increased or decreased according to the on-site conditions; an air inlet 44 is arranged on the side wall of the exhaust pipe 4, an exhaust port 42 is arranged on the top, a hydrogen pipeline flame arrester 43 is arranged at the exhaust port 42, and a lightning rod 41 is arranged on the top of the exhaust port 42.

[0027] Working principle: A hydrogen concentration detector 5 is installed on the air inlet 44 of the spray tower 2, and is interlocked with the frequency of the induced draft fan 3. By adjusting the frequency of the induced draft fan 3, the induced air volume of the induced draft fan 3 is controlled, and the hydrogen concentration in the hydrogen-containing tail gas is controlled to be below 25% of the lower limit of the hydrogen explosion concentration; a hydrogen pipeline flame arrester 43 is installed on the top of the exhaust pipe 4 to effectively avoid the risk of explosion caused by the backfire of the fire source outside the system into the system. A lightning rod 41 is installed on the top of the exhaust pipe 4 to prevent lightning strikes.

[0028] When the above technical solution is used, the circulation pump of the spray tower 2 is first turned on to ensure the stable operation of the circulation pump of the spray tower 2, and then the concentration alarm line of the hydrogen concentration detector 5 is set at 25% of the lower limit of the hydrogen explosion concentration, and the induced draft fan 3 is turned on to uniformly add lithium ion battery recovery powder into the feeding port 11 of the reactor 1, and the opening frequency of the induced draft fan 3 is controlled by the concentration of the hydrogen concentration detector 5.

[0029] Example 1

[0030] In this embodiment, the circulation pump of the spray tower 2 is first turned on, and then the concentration alarm line of the hydrogen concentration detector 5 is set at a hydrogen concentration of 1.0 vol%. Finally, the induced draft fan 3 is turned on, and lithium ion battery recovery powder containing 1.5 wt% aluminum is added to the feeding port 11 of the reactor 1 at a uniform speed of 5 t / h.

[0031] Example 2

[0032] In this embodiment, the circulating pump of the spray tower 2 is first turned on, and the concentration alarm line of the hydrogen concentration detector 5 is set at a hydrogen concentration of 1.0 vol%. Finally, the induced draft fan 3 is turned on, and lithium-ion battery recovery powder containing 1.5 wt% aluminum is added to the feed port 11 of the reactor 1 at a uniform speed of 6 t / h.

[0033] Example 3

[0034] In this embodiment, the circulation pump of the spray tower 2 is first turned on, and then the concentration alarm line of the hydrogen concentration detector 5 is set at a hydrogen concentration of 0.8 vol%. Finally, the induced draft fan 3 is turned on, and lithium ion battery recovery powder containing 1.5 wt% aluminum is added to the feed port 11 of the reactor 1 at a uniform speed of 5 t / h.

[0035] Example 4

[0036] In this embodiment, the circulation pump of the spray tower 2 is first turned on, and then the concentration alarm line of the hydrogen concentration detector 5 is set at a hydrogen concentration of 0.8 vol%. Finally, the induced draft fan 3 is turned on, and lithium ion battery recovery powder containing 1.5 wt% aluminum is added to the feed port 11 of the reactor 1 at a uniform speed of 6 t / h.

[0037] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydrogen-containing tail gas treatment device, characterized in that: include: A reaction kettle (1), a spray tower (2), an induced draft fan (3) and an exhaust pipe (4); an induced draft port (12) and an air blast port (13) are arranged on one side of the top end of the reaction kettle (1); an air outlet (21) is arranged on the top end of the spray tower (2); an air inlet (26) is arranged on the side wall of the spray tower (2); the air blast port (13) is connected to the atmosphere; the induced draft port (12) and the air inlet (26) are connected by pipeline; the air outlet (21) is connected to the induced draft fan (3) by pipeline; and the induced draft fan (3) is connected to the exhaust pipe (4).

2. A hydrogen-containing tail gas treatment device according to claim 1, characterized in that: A hydrogen concentration detector (5) is provided on the pipeline connecting the air induced port (12) and the air inlet (26), and the hydrogen concentration detector (5) is electrically connected to the induced draft fan (3).

3. A hydrogen-containing tail gas treatment device according to claim 1, characterized in that: A hydrogen pipeline flame arrester (43) is provided at the top end of the exhaust pipe (4).

4. A hydrogen-containing tail gas treatment device according to claim 1, characterized in that: The reactor (1) is also provided with a feeding port (11), and the feeding port (11) is used to feed battery recovery powder into the reactor (1).

5. The hydrogen-containing tail gas treatment device according to claim 1, characterized in that: The spray tower (2) is also provided with a demister (22), a spray system (23), a filling system (24) and a dosing box (25); the demister (22) is arranged at the top of the spray tower (2); the spray system (23) is arranged in the middle of the spray tower (2); the filling system (24) is located in the middle of the spray tower (2) and below the spray system (23); the dosing box (25) is arranged at the bottom of the spray tower (2); and the air inlet (26) is connected to the dosing box (25).

6. A hydrogen-containing tail gas treatment device according to claim 3, characterized in that: The exhaust pipe (4) is provided with an air inlet (44) on its side wall and an exhaust port (42) at its top end, and the hydrogen pipeline flame arrester (43) is arranged at the exhaust port (42).

7. A hydrogen-containing tail gas treatment device according to claim 6, characterized in that: A lightning rod (41) is arranged at the top of the exhaust port (42).

8. The hydrogen-containing tail gas treatment device according to claim 1, characterized in that: The induced draft fan (3) is a frequency conversion device.

9. The hydrogen-containing tail gas treatment device according to claim 1, characterized in that: The spray tower (2), the induced draft fan (3) and the exhaust pipe (4) are all made of stainless steel.

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