System for on-line monitoring of process gas in lithium battery heat treatment recovery industry

Abstract

The utility model discloses a system for online monitoring process gas in the lithium battery heat treatment recovery industry, which comprises a two-stage liquid washing device, a filter box, a condenser, an adsorption tube and a detector which are connected in sequence, and the two-stage liquid washing device comprises a first-stage liquid washing device and a second-stage liquid washing device, the first-stage liquid washing device is further connected with a liquid storage filter box, and the liquid storage filter box is connected with a PLC and used for replacing washing liquid in the first-stage liquid washing device. The system provided by the utility model can realize on-line monitoring of gas in the heat treatment recovery process of the waste lithium battery in a short process and for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery recycling and gas detection technical field especially relates to a system for lithium battery heat treatment recycling industry process gas on -line monitoring. BACKGROUND

[0002] A large amount of waste gas is produced in the lithium battery heat treatment recycling process, and the waste gas components are complex, including metal dust powder, carbon particle dust, PVDF (binder) thermal reaction gas, HF, macromolecular organic gas, small molecular organic gas, water vapor and different valence phosphoric acid, which is difficult to detect in real time.

[0003] In the existing detection equipment, most of them adopt filter element filtration, and the cumulative effect of filter layer causes burden to the sampling pump, reduces the service life of the pump and affects the normal use; and cannot continuously remove small molecular gases such as HF, which can easily corrode the detector cavity after entering the pipeline and interfere with the monitoring effect, and greatly reduce the service life of the detector. UTILITY MODEL CONTENT

[0004] In view of the defects in the prior art, the utility model aims at providing a system for lithium battery heat treatment recycling industry process gas on -line monitoring, which realizes the continuity, stability and automation of gas monitoring through a short process and efficient gas treatment process.

[0005] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A system for lithium battery heat treatment recycling industry process gas on -line monitoring, comprising: two-stage liquid washing device, filter box, condenser, adsorption pipe and detector connected in sequence, the two-stage liquid washing device comprises first-stage liquid washing device and second-stage liquid washing device, the first-stage liquid washing device is further connected with liquid storage filter box, the liquid storage filter box is connected with PLC, which is used for replacing the washing liquid in the first-stage liquid washing device.

[0007] Preferably, a diaphragm pump is arranged between the condenser and the adsorption pipe, which provides negative pressure for the two-stage liquid washing device, filter box and condenser.

[0008] Preferably, the front end of the two-stage liquid washing device is connected with a heat tracing pipeline.

[0009] Preferably, a heat tracing temperature setting device is arranged on the heat tracing pipeline.

[0010] Preferably, the gas inlet end of the two-stage liquid washing device is further provided with a nitrogen back flushing mechanism and a pipeline pressure sensor.

[0011] Preferably, the first-stage liquid washing device is provided with bubble diffusion plates with different hole diameters, and the second-stage liquid washing device is further added with acid-base indicator.

[0012] Preferably, a calibration gas pipeline is further arranged between the condenser and the adsorption pipe for periodic calibration of the detector.

[0013] Preferably, the condenser is further connected with a liquid storage barrel.

[0014] Preferably, the gas outlet end of the detector is further provided with a flow meter.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The system provided by the present application can replace the washing liquid in the first-stage liquid washing device at regular intervals, thereby realizing continuous pretreatment of the gas, and further ensuring that the monitoring system can continuously and stably operate, and realizing all-weather gas monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0017] The features and advantages of the present application will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, which are given by way of illustration and are not to be construed as limiting the present application, in which:

[0018] Figure 1 is a structural schematic diagram of a lithium battery heat treatment and recovery gas all-weather online monitoring system according to the preferred embodiment of the present application.

[0019] EXPLANATION OF REFERENCE NUMERALS

[0020] 1, heat tracing pipeline; 2, two-stage liquid washer; 3, filter box; 4, condenser; 5, adsorption pipe 5; 6, detector; 7, liquid storage filter box; 8, diaphragm pump; 9, nitrogen back flushing mechanism; 10, calibration gas pipeline; 11, liquid storage barrel; 12, flow meter. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] A system for online monitoring of process gas in the lithium battery heat treatment and recovery industry, like Figure 1As shown, it comprises: two-stage liquid washing device 2, filter box 3, condenser 4, adsorption tube 5 and detector 6 connected in sequence, the two-stage liquid washing device 2 comprises a first-stage liquid washing device and a second-stage liquid washing device, the first-stage liquid washing device is further connected with a liquid storage filter box 7, the liquid storage filter box 7 is connected with a PLC, which is used to replace the washing liquid in the first-stage liquid washing device. The lithium battery heat treatment recovery gas removes dust through the two-stage liquid washing device 2; the liquid storage filter box 7 can replace the washing liquid with a mixed solution of a certain proportion of NaOH, glycerol and water at a certain time, on the one hand, the solvent increases the capture effect of organic dust, on the other hand, it can dissolve the condensed organic matter, preventing the two-stage liquid washing device 2 from being blocked. The washed gas is filtered again through the filter box 3 to reach the condenser 4, and the water vapor in the gas to be measured is condensed (a variety of condensers can be used for condensation, for example, a semiconductor condenser, a compressor type condenser or a heat exchange compressed air condenser), after condensation, most of the water vapor and VOCs in the gas have been removed, and the gas composition only contains some small molecular organic matter, which has little effect on the latter pump and detector 6, ensuring the continuous operation of the system and the stability and accuracy of the detection results. The detector 6 can test a variety of gas components, such as carbon monoxide, oxygen and carbon dioxide, and corresponding sensors can be selected and installed according to requirements for monitoring.

[0023] The gas reaches the adsorption tube 5, the filler in the adsorption tube 5 is composed of activated carbon and silica gel, which is used for pretreatment of the front-end gas and indicates the gas purification efficiency, and finally reaches the monitoring instrument. This system completes the purification of the complex lithium battery heat treatment recovery gas through four steps of liquid washing, filtration retention, drying and adsorption in a very small equipment and device of 100mm*100mm*40mm, and each stage of the device is provided with an indication function, which greatly ensures the continuous operation of the device and the high purity and non-pollution of the gas to be monitored. The physical and chemical process strengthening method is used to strengthen the liquid washing effect of the gas, so as to ensure that the high-precision instrument and sensor for detecting the gas are not damaged. At the same time, the equipment adopts full-automatic self-cleaning, which reduces the labor intensity of equipment maintenance.

[0024] In some embodiments, a diaphragm pump 8 is further arranged between the condenser 4 and the adsorption tube 5, which provides negative pressure for the two-stage liquid washing device 2, the filter box 3 and the condenser 4. The diaphragm pump 8 provides negative pressure for the front-end process, so that the lithium battery heat treatment recovery gas to be monitored can smoothly enter the two-stage liquid washing device 2.

[0025] In some embodiments, the front-end gas pipeline of the two-stage liquid washing device 2 is communicated with the heat tracing pipeline 1. The lithium battery recovery heat treatment gas usually passes through a heat exchange system for waste heat recovery, and the gas inlet end of the two-stage liquid washing device 2 can also be communicated with the heat tracing pipeline 1 in the present application.

[0026] In some embodiments, the heating pipe 1 is provided with a heating temperature setting device.

[0027] In some embodiments, the gas inlet end of the two-stage liquid washer 2 is further provided with a nitrogen back flushing mechanism 9 and a pipe pressure sensor. In order to ensure the continuity and stability of the monitoring, the nitrogen back flushing mechanism 9 and the heating temperature setting device are added at the front end of the two-stage liquid washer 2, and the front end pipe of the two-stage liquid washer 2 is periodically heated and purged, and the pipe pressure sensor is also provided for monitoring the change of the internal pressure of the pipe when the nitrogen back flushing mechanism 9 works.

[0028] In some embodiments, the first-stage liquid washing device is provided with bubble diffusion plates with different hole diameters, and an acid-base indicator is added in the second-stage liquid washing device. The indicator in the present application can also be a solvent prepared from phenolphthalein acid-base indicator, glycerol, water and the like, which has a continuous indicating effect and drying effect, and can indicate the removal efficiency of the acid gas such as HF in the first-stage liquid washing device. Through the two-stage liquid washing, the dust removal rate of the lithium battery heat treatment recycling equipment reaches 99%, and the acid gas and HF gas have been removed completely, and the indicator in the second-stage liquid washer can also prompt the addition of alkaline substances in the storage tank in the first-stage liquid washer, achieving the prompting effect. In the liquid washing treatment system formed by adding the bubble diffusion plates and the solution with a matched ratio, the dust interception efficiency is more than 95% and the first-stage absorption effect of the acid gas is more than 90% under the condition that the detection gas flow rate is 15 L / min.

[0029] In some embodiments, a calibration gas pipe 10 is further provided between the condenser 4 and the adsorption pipe 5. The calibration gas pipe 10 is installed at the front end of the adsorption pipe 5, and the detector 6 is periodically calibrated with corresponding gas concentration to calibrate the sensor and ensure the accuracy of the test concentration value.

[0030] In some embodiments, the condenser 4 is further connected with a liquid storage barrel 11 for collecting the condensed liquid in the condenser 4.

[0031] In some embodiments, the gas outlet end of the detector 6 is further provided with a flow meter 12 for adjusting the flow of the gas to be detected.

[0032] In some embodiments, the liquid storage and filtration tank includes an inclined plate sedimentation tank, a shallow sedimentation tank and a communicating vessel, which is used to update the washing liquid in the first-stage liquid washer and realize the regeneration and recycling of the washing liquid.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Various technical features are described in this detailed description. Many of the technical features described can be combined in any combination. Descriptions of features in the following description that can be combined will be brought to mind by phrases such as "can be combined," "can be included," "can be associated," "can be employed," "can be used," and the like.

Claims

1. A system for online monitoring of process gases in lithium battery thermal treatment recycling industry, characterized by, The utility model relates to a two-stage liquid washing device for detecting trace gas, comprising: a two-stage liquid washing device, a filter box, a condenser, an adsorption tube and a detector connected in sequence, wherein the two-stage liquid washing device comprises a first-stage liquid washing device and a second-stage liquid washing device, the first-stage liquid washing device is further connected with a liquid storage filter box, the liquid storage filter box is connected with a PLC for replacing the washing liquid in the first-stage liquid washing device; a diaphragm pump is further arranged between the condenser and the adsorption tube, and the diaphragm pump provides negative pressure for the two-stage liquid washing device, the filter box and the condenser.

2. The system for online monitoring of process gas in lithium battery thermal treatment recycling industry according to claim 1, characterized in that, The front end of the two-stage liquid washing device is connected with a heat tracing pipeline through an air inlet pipeline.

3. The system for online monitoring of process gases in lithium battery thermal treatment recycling industry according to claim 2, characterized in that, A heat tracing temperature setting device is arranged on the heat tracing pipeline.

4. The system for online monitoring of process gases in lithium battery thermal treatment recycling industry according to claim 1, characterized in that, The air inlet end of the two-stage liquid washing device is further provided with a nitrogen back flushing mechanism and a pipeline pressure sensor.

5. The system for online monitoring of process gases in lithium battery thermal treatment recycling industry according to claim 1, characterized in that, Different aperture bubble diffusion plates are arranged in the first-stage liquid washing device, and an acid-base indicator is further added in the second-stage liquid washing device.

6. The system for online monitoring of process gases in lithium battery thermal treatment recycling industry according to claim 1, characterized in that, A calibration gas pipeline is further arranged between the condenser and the adsorption tube for periodically calibrating the detector.

7. The system for online monitoring of process gases in lithium battery thermal treatment recycling industry according to claim 1, characterized in that, The condenser is further connected with a liquid storage barrel.

8. The system for online monitoring of process gases in lithium battery thermal treatment recycling industry according to claim 1, characterized in that, A flow meter is further arranged at the air outlet end of the detector.

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