System for switching preheating heat sources of lithium battery

Abstract

The utility model relates to the technical field of waste battery recovery, and discloses a system for switching a lithium battery preheating heat source, which comprises a hot blast stove I, a hot blast stove II, a preheating furnace and a nitrogen tank, a ventilation pipeline on one side of the preheating furnace is connected to an air outlet at the tail of a cement kiln, and the ventilation pipeline is connected with an electric valve I; a first hot-blast stove is arranged on the ventilation pipeline, a third frequency conversion fan is connected to the ventilation pipeline of the first hot-blast stove, and an expansion joint is installed on the ventilation pipeline between the third frequency conversion fan and the preheating furnace. According to the system for switching the lithium battery preheating heat source, the hot blast stove is additionally arranged for heat compensation, when a cement kiln is stopped, in order to guarantee continuous operation of the battery preheating system, another heat source needs to be provided for replacement, the hot blast stove is additionally arranged for heating gas of the preheating furnace, and the oxygen content of smoke is reduced by additionally arranging the nitrogen system; and the heat source of the preheating furnace meets the requirements of temperature and oxygen content.

Description

Technical Field

[0001] The utility model relates to the technical field of waste battery recycling, in particular to a system for switching heat sources for preheating lithium batteries. Background Art

[0002] With the rapid development of new energy technologies such as electric vehicles, the use of power lithium batteries is increasing, and the problem of recycling waste power lithium batteries is becoming more and more prominent.

[0003] At present, there are various recycling technologies for waste power lithium batteries. Waste lithium batteries are sent to preheating furnaces for preheating and evaporating lithium battery electrolytes, which is an important part of subsequent crushing and sorting pretreatment. However, there are generally problems such as high processing costs and heat source requirements for lithium battery preheating furnaces. Therefore, we propose a system for switching heat sources for lithium battery preheating to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the utility model provides a system for switching the heat source for lithium battery preheating, which has the advantages of meeting the continuous production of the preheating furnace and ensuring the continuity of project production, and solves the problem of heat source demand for the lithium battery preheating furnace.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of satisfying the continuous production of the preheating furnace and ensuring the continuity of project production, the utility model provides the following technical solutions: a system for switching the heat source for preheating of lithium batteries, comprising a hot air furnace 1, a hot air furnace 2, a preheating furnace, and a nitrogen tank. The ventilation duct on one side of the preheating furnace is connected to the air outlet at the tail of the cement kiln. An electric valve 1 is connected to the ventilation duct near the air outlet at the tail of the cement kiln. A hot air furnace 1 is provided on the ventilation duct. An electric valve 2 is provided on the hot air furnace 1. A variable frequency fan 1 is connected to the hot air furnace 1. A variable frequency fan 3 is connected to the ventilation duct of the hot air furnace 1. An expansion joint is installed on the ventilation duct between the variable frequency fan 3 and the preheating furnace. The air outlet end of the nitrogen tank is connected to the ventilation duct, and an electric valve 3 is provided at the air outlet end.

[0008] Preferably, an oxygen detector and a temperature detector are fixedly connected to the preceding ventilation duct of the variable frequency fan three.

[0009] Preferably, the air outlet of the hot blast stove 2 is connected to the ventilation duct, and the air inlet of the hot blast stove 2 is connected to an electric valve 4.

[0010] Preferably, the oxygen detector is configured to form an interlocking system with the nitrogen tank and the electric valve three, and the temperature detector is configured to form an interlocking system with the hot air furnace two and the electric valve four.

[0011] (III) Beneficial effects

[0012] Compared with the prior art, the utility model provides a system for switching heat sources for preheating lithium batteries, which has the following beneficial effects:

[0013] 1. The system for switching the heat source for lithium battery preheating utilizes the heat source system of the cement kiln and uses a backup heat source system to ensure that after the cement kiln is stopped, the heat source demand of the lithium battery preheating furnace is solved, the continuous production of the preheating furnace is met, the continuity of project production is ensured, and the recovery efficiency and resource utilization rate of waste power lithium batteries are improved.

[0014] 2. The system for switching the heat source for lithium battery preheating adds a hot air furnace for supplementary heating. When the cement kiln stops, in order to ensure the continuous operation of the battery preheating system, another heat source needs to be provided as a substitute. A hot air furnace is added to heat the gas in the preheating furnace, and the oxygen content of the flue gas is reduced by adding a nitrogen system to ensure that the heat source of the preheating furnace meets the temperature and oxygen content requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the process flow of the utility model;

[0016] In the figure: 1 hot air furnace 1, 2 variable frequency fan 1, 3 hot air furnace 2, 4 variable frequency fan 2, 5 nitrogen tank, 6 variable frequency fan 3, 7 preheating furnace, 8 electric valve 1, 9 electric valve 2, 10 electric valve 3, 11 electric valve 4, 12 oxygen detector, 13 temperature monitor, 14 electric valve 5, 15 expansion joint. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1A system for switching heat sources for preheating lithium batteries comprises a hot air furnace 1, a hot air furnace 2 3, a preheating furnace 7 and a nitrogen tank 5. A ventilation duct on one side of the preheating furnace 7 is connected to the air outlet at the tail of the cement kiln. An electric valve 1 8 is connected to the ventilation duct near the air outlet at the tail of the cement kiln. A hot air furnace 1 is provided on the ventilation duct. An electric valve 2 9 is provided on the hot air furnace 1. A variable frequency fan 2 is connected to the hot air furnace 1. A variable frequency fan 3 6 is connected to the ventilation duct of the hot air furnace 1. An expansion joint 15 is installed on the ventilation duct between the variable frequency fan 3 6 and the preheating furnace 7 to absorb the expansion or contraction of the pipeline due to temperature changes or pressure changes to prevent the pipeline from rupture or leakage. The outlet end of the nitrogen tank 5 is connected to the ventilation duct and an electric valve 3 10 is provided at the outlet end. The nitrogen tank 5 is used to store nitrogen, which may be used as a nitrogen in the process. It is an inert gas to prevent other substances from being oxidized or burned. An oxygen detector 12 is fixedly connected to the preceding ventilation duct of the variable frequency fan three 6, which is used to detect the oxygen concentration in the environment to ensure safe operation and a temperature detector 13, which is used to monitor the temperature in the process to ensure that the operation is carried out within an appropriate temperature range. The air outlet of the hot blast furnace two 3 is connected to the ventilation duct, and an electric valve four 11 is connected to the air inlet of the hot blast furnace two 3. The oxygen detector 12 is set to form an interlocking system with the nitrogen tank 5 and the electric valve three 10, and the temperature detector 13 is set to form an interlocking system with the hot blast furnace two 3 and the electric valve four 11. The variable frequency fan is usually used to control the flow and pressure of gas or fluid, and to adjust the airflow in the hot blast furnace. The electric valve is used to control the flow of fluid in the pipeline, and can be opened or closed as needed to adjust the flow direction and flow of the fluid.

[0019] like Figure 1 As shown, the heat source of the lithium battery preheating furnace 7, under normal circumstances, utilizes the flue gas at the tail of the cement kiln. The flue gas conditions are: temperature of about 320°C and oxygen content less than 5%. When the flue gas temperature is insufficient, supplementary heat is provided by adding a hot blast furnace 1; but when the cement kiln is stopped, in order to ensure the continuous operation of the battery preheating system, another heat source is required as a substitute, and a hot blast furnace 2 3 is added to heat the gas of the preheating furnace 7, and by adding a nitrogen system, the oxygen content of the flue gas is reduced to ensure that the heat source of the preheating furnace meets the temperature and oxygen content requirements.

[0020] It should be noted that in actual use of the device, first, after the battery enters the preheating furnace 7, under normal circumstances, the heat source of the preheating furnace utilizes the flue gas at the tail of the cement kiln, and the electric valve 2 9, the electric valve 3 10, and the electric valve 4 11 are closed to ensure that the flue gas temperature of the preheating furnace is 320°C and the oxygen content is less than 5%, so that the battery electrolyte can be safely evaporated. After fully utilizing the preheating of the cement kiln to evaporate the electrolyte, the battery is no longer charged. After the battery electrolyte evaporates, the battery is in a safe state.

[0021] When the cement kiln is shut down, the heat source of the preheating furnace 7 cannot utilize the flue gas at the tail of the cement kiln, and the preheating furnace heat source alternative system is started. At this time, the electric valve 1 8 is closed, and the electric valve 2 9, the electric valve 3 10, and the electric valve 4 11 are opened. At the same time, the hot blast furnace 1 1 and the hot blast furnace 2 3 are started, and the nitrogen tank 5 is opened. An oxygen monitor 12 and a temperature detector 13 are added to the preceding pipeline of the variable frequency fan 3 6. The oxygen monitor 12 is interlocked with the nitrogen tank 5 and the electric valve 10. When the oxygen concentration is higher than 5%, the opening amplitude of the electric valve 3 10 is increased to increase the amount of nitrogen entering. The temperature detector 13 is interlocked with the hot blast furnace 2 3 and the variable frequency fan 2 4. When the temperature is lower than 320°C, the temperature of the flue gas is adjusted by the hot blast furnace 2 3 and the variable frequency fan 2 4 to meet the heat source demand of the subsequent lithium battery preheating furnace.

[0022] When the cement kiln is started, close electric valve 2 9, electric valve 3 10, electric valve 4 11, close hot blast furnace 2 3 and variable frequency fan 2 4, open electric valve 1 8, and continue to use the tail gas of the cement kiln.

[0023] The utility model can ensure the continuous production of the lithium battery preheating furnace and ensure the continuity of project production.

[0024] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for switching heat sources for preheating lithium batteries, comprising a hot air furnace 1 (1), a hot air furnace 2 (3), a preheating furnace (7), and a nitrogen tank (5), characterized in that: The ventilation duct on one side of the preheating furnace (7) is connected to the air outlet at the tail of the cement kiln, and an electric valve one (8) is connected to the ventilation duct near the air outlet at the tail of the cement kiln. A hot air furnace one (1) is provided on the ventilation duct, and an electric valve two (9) is provided on the hot air furnace one (1). A variable frequency fan one (2) is connected to the hot air furnace one (1), and a variable frequency fan three (6) is connected to the ventilation duct of the hot air furnace one (1). An expansion joint (15) is installed on the ventilation duct between the variable frequency fan three (6) and the preheating furnace (7). The air outlet end of the nitrogen tank (5) is connected to the ventilation duct, and an electric valve three (10) is provided at the air outlet end.

2. A system for switching heat sources for preheating lithium batteries according to claim 1, characterized in that: An oxygen detector (12) and a temperature detector (13) are fixedly connected to the preceding ventilation duct of the variable frequency fan three (6).

3. A system for switching heat sources for preheating lithium batteries according to claim 1, characterized in that: The air outlet of the second hot air furnace (3) is connected to the ventilation duct, and the air inlet of the second hot air furnace (3) is connected to the fourth electric valve (11).

4. A system for switching heat sources for preheating lithium batteries according to claim 2, characterized in that: The oxygen detector (12) is configured to form an interlocking system with the nitrogen tank (5) and the electric valve three (10), and the temperature detector (13) is configured to form an interlocking system with the hot air furnace two (3) and the electric valve four (11).

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