Online automatic monitoring and adjusting system for oxygen content of slurry

Abstract

An on-line automatic monitoring and adjusting system for the oxygen content of slurry comprises a reaction kettle, an air inlet structure used for introducing air into the slurry in the kettle is arranged in the reaction kettle, and a pressure release valve is arranged at an air outlet in the top of the reaction kettle; the device further comprises an oxygen content detecting and adjusting device which comprises an extracting device used for extracting part of clear liquid in the slurry, a detecting device used for collecting oxygen content signals of the clear liquid and an air adjusting valve arranged on an air inlet pipeline of the air inlet structure. And the control unit is used for controlling the opening degree of the air regulating valve based on the oxygen content signal. According to the utility model, the oxygen content detection and adjustment device is arranged, so that the oxygen content of slurry in the reaction kettle can be detected, and the air flow input into the reaction kettle is controlled according to the detected oxygen content data, so that the oxygen content is automatically monitored and adjusted on line, and the oxidation uniformity of a precursor is ensured.

Description

Technical Field

[0001] The utility model relates to the field of material synthesis, in particular to an online automatic monitoring and regulating system for slurry oxygen content. Background Art

[0002] The ternary precursor oxidation process is a commonly used method in the preparation of lithium-ion batteries. It can produce high-performance cathode materials with high energy density and cycle stability. At the same time, the process is also highly flexible. By controlling the input ratio of different metal ions and process parameters, the structure and performance of the cathode material can be adjusted to meet the battery performance requirements of different applications.

[0003] At present, the most common oxidation process is to use air to oxidize the precursor. In order to ensure uniform oxidation of the precursor, it is generally necessary to set an air regulating valve on the air input pipeline to achieve stable control of the air input flow rate. However, during the use of the air regulating valve, there will be a certain degree of attenuation, and the stability of the air flow rate cannot be fully guaranteed. Therefore, this method of oxidizing the precursor by controlling the gas flow rate cannot oxidize the precursor uniformly, and there are differences in product batches under the same regulating valve opening.

[0004] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a topic to be studied and solved in the present invention. Utility Model Content

[0005] The utility model aims to provide an online automatic monitoring and regulating system for slurry oxygen content.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An online automatic monitoring and regulating system for slurry oxygen content comprises a reactor, wherein an air intake structure for introducing air into the slurry in the reactor is provided in the reactor, and a pressure relief valve is provided at the air outlet on the top of the reactor;

[0008] It also includes an oxygen content detection and adjustment device, which includes an extraction device for extracting a portion of the clear liquid in the slurry, a detection device for collecting the oxygen content signal of the clear liquid, an air adjustment valve arranged on the intake pipeline of the intake structure, and a control unit for controlling the opening of the air adjustment valve based on the oxygen content signal.

[0009] In a further solution, the air intake structure includes an air coil, on which air outlet holes are evenly arranged, and which is connected to an air pump outside the reactor through the air intake pipeline.

[0010] In a further embodiment, the extraction device includes a self-circulating pipeline, a circulating pump, a branch pipeline, a filter and a clear liquid temporary storage tank;

[0011] The two ends of the self-circulating pipeline are respectively connected to the slurry outlet and slurry inlet of the reactor;

[0012] The circulation pump is connected in series to the self-circulation pipeline and is electrically connected to the control unit;

[0013] The head end of the branch pipeline is connected to the self-circulating pipeline, and the tail end is connected to the clear liquid temporary storage tank;

[0014] The filter is arranged in the branch pipe.

[0015] In a further solution, the branch pipeline is connected to the self-circulating pipeline via a three-way pipe, and the filter is detachably connected in a channel of the three-way pipe connected to the branch pipeline.

[0016] In a further solution, the filter screen of the filter is arranged at the entrance of a channel of the three-way pipe.

[0017] In a further solution, the diameter of the branch pipeline is smaller than the diameters of the three-way pipe and the self-circulating pipeline.

[0018] In a further solution, a liquid outlet is provided at one side of the bottom of the clear liquid temporary storage tank, and a liquid outlet regulating valve is provided at the liquid outlet, and the liquid outlet regulating valve is electrically connected to the control unit.

[0019] In a further solution, the detection device adopts a dissolved oxygen meter, a measuring probe of the dissolved oxygen meter is arranged in the clear liquid temporary storage tank, and the dissolved oxygen meter is electrically connected to the control unit.

[0020] The working principle and advantages of this utility model are as follows:

[0021] The utility model is capable of detecting the oxygen content of the slurry in the reactor by arranging an oxygen content detection and adjustment device, and controlling the air flow input into the reactor according to the detected oxygen content data, thereby realizing online automatic monitoring and adjustment of the oxygen content, ensuring the oxidation uniformity of the precursor, and solving the problem that the air flow is unstable due to a certain degree of attenuation of the air regulating valve, thereby affecting the oxidation uniformity of the precursor and the differences in product batches;

[0022] The utility model separates part of the slurry into slurry and clear liquid through the oxygen content detection and adjustment device, extracts the clear liquid to detect the oxygen content therein, which can avoid the slurry from affecting the measurement accuracy of the measuring probe and ensure accurate control of the oxygen content;

[0023] The oxygen content detection and adjustment device of the utility model is externally arranged, and is easy to install. The cleaning of the measuring probe and the replacement of the filter are relatively convenient, and the modification of the reaction kettle is not great. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0025] Attached Figure 2 1 is a system block diagram of an embodiment of the present utility model.

[0026] In the above attached figure:

[0027] 1 reactor; 11 air intake structure; 12 pressure relief valve; 13 air intake pipeline;

[0028] 2 oxygen content detection and adjustment device; 21 extraction device; 211 self-circulation pipeline; 212 circulation pump; 213 branch pipeline; 214 filter; 215 clear liquid temporary storage tank; 216 liquid outlet regulating valve; 217 three-way pipe; 22 detection device; 23 air regulating valve; 24 control unit. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0030] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0031] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0032] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0033] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0034] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0035] See attached Figure 1-2 , an online automatic monitoring and regulating system for slurry oxygen content, comprising a reactor 1 and an oxygen content detection and regulating device 2.

[0036] The reactor 1 is provided with an air intake structure 11 for introducing air into the slurry in the reactor, and a pressure relief valve 12 is provided at the air outlet on the top of the reactor 1; when air is introduced into the reactor 1 to oxidize the slurry, the air pressure in the reactor 1 will gradually rise, and when a certain air pressure is reached, the pressure relief valve 12 will automatically open to release the pressure to keep the air pressure in the reactor 1 safe and stable.

[0037] The oxygen content detection and adjustment device 2 includes an extraction device 21 for extracting part of the clear liquid in the slurry, a detection device 22 for collecting the oxygen content signal of the clear liquid, an air adjustment valve 23 arranged on the intake pipe 13 of the intake structure 11, and a control unit 24 for controlling the opening of the air adjustment valve 23 based on the oxygen content signal.

[0038] The air intake structure 11 includes an arc-shaped air coil, which surrounds the bottom of the reactor 1 and avoids the stirring paddle in the reactor 1. The air coil is evenly provided with air outlet holes, and is connected to the air pump outside the reactor 1 through the air intake pipeline 13; when the air pump is working, the external air is transported to the air coil through the air intake pipeline 13, and then discharged into the slurry through the air outlet holes on the air coil to oxidize the precursor slurry.

[0039] The extraction device 21 includes a self-circulating pipeline 211, a circulation pump 212, a branch pipeline 213, a filter 214 and a clear liquid temporary storage tank 215; the two ends of the self-circulating pipeline 211 are respectively connected to the slurry outlet and the slurry inlet of the reactor 1; the circulation pump 212 is serially connected to the self-circulating pipeline 211 and is electrically connected to the control unit 24; the head end of the branch pipeline 213 is connected to the self-circulating pipeline 211, and the end is connected to the clear liquid temporary storage tank 215; a liquid outlet is arranged on one side of the bottom of the clear liquid temporary storage tank 215, and a liquid outlet regulating valve 216 is arranged at the liquid outlet, and the liquid outlet regulating valve 216 is electrically connected to the control unit 24; the filter 214 is arranged in the branch pipeline 213.

[0040] The branch pipe 213 is connected to the self-circulating pipe 211 through a tee pipe 217 and multiple flanges. To facilitate the cleaning and replacement of the filter 214, the filter 214 can be detachably connected to a channel of the tee pipe 217 connected to the branch pipe 213. Specifically, the filter 214 and a channel of the tee pipe 217 can be connected through a flange, and the branch pipe 213 can be a hose at the tail end of the filter 214. When the circulation pump 212 is working, the slurry in the reactor 1 is extracted through the self-circulating pipe 211. When it reaches the tee pipe 217, part of the slurry is filtered through the filter 214 to obtain slurry and clear liquid, wherein the clear liquid is discharged through the branch pipe 213 and stored in the clear liquid temporary storage tank 215, and the slurry is recycled to the reactor 1 along with the continuously extracted slurry.

[0041] In order to prevent the slurry from clogging the filter 214 , the filter screen of the filter 214 can be set at the entrance of a channel of the three-way pipe 217 , so that the slurry can be pushed upward by the slurry extracted from the bottom and then flow back to the reactor 1 .

[0042] In order to ensure smooth and stable self-circulation of the slurry without affecting the water ratio in the slurry, the slurry in the self-circulation pipeline 211 needs to be the majority, and the slurry flowing into one channel of the tee pipe 217 needs to be a small part. Therefore, the diameter of the branch pipeline 213 needs to be smaller than the diameters of the tee pipe 217 and the self-circulation pipeline 211.

[0043] The detection device 22 uses a dissolved oxygen meter, the measuring probe of which is fixed on the inner wall of the clear liquid temporary storage tank 215, and its surface material is made of acid and alkali resistant material, generally stainless steel, and the measuring temperature range is 0-70° C. The dissolved oxygen meter is electrically connected to the control unit 24.

[0044] Among them, the control unit 24 can adopt a single-chip microcomputer, and its control principle, control method and communication are existing technologies, which are mature technologies that can be mastered by technical personnel in this field. The control and communication between the dissolved oxygen meter, valve and pump body are also widely used in the existing technology. Since it is not the invention point of this case, it will not be elaborated in this case.

[0045] When the above-mentioned online automatic monitoring and adjustment system is in operation, the control unit 24 first starts the air pump and adjusts the opening of the air regulating valve 23. The air pumped in by the air pump is dispersed in the air coil through the air inlet pipe 13 and enters the reactor 1 through the air outlet to oxidize the slurry in the reactor. When a certain air pressure is reached in the reactor, the pressure relief valve 12 releases the pressure. At this time, the air flow in the reactor 1 is in a stable state.

[0046] Then, the circulation pump 212 and the dissolved oxygen meter are started, and the slurry in the kettle circulates in the self-circulation pipe 211. When passing through the filter 214, part of the clear liquid is separated from the slurry, and the separated clear liquid flows into the clear liquid temporary storage tank 215. When the clear liquid level is above the measuring probe of the dissolved oxygen meter, the detected oxygen content signal will be fed back to the dissolved oxygen meter, converted into oxygen content data and then sent to the control unit 24. The control unit 24 determines whether the oxygen content data is within the threshold range based on the preset dissolved oxygen threshold range. If not, the opening of the air control valve 23 is adjusted to adjust the oxygen content.

[0047] Among them, when the clear liquid is continuously separated and flows into the clear liquid temporary storage tank 215, the clear liquid does not need to be emptied. It only needs to adjust the liquid outlet valve to control the liquid inlet flow rate and the liquid outlet flow rate to be the same, so as to maintain the liquid level of the clear liquid storage tank and ensure that the dissolved oxygen meter detects the oxygen content in real time.

[0048] During the operation of the system, if the opening of the air regulating valve 23 remains unchanged, that is, the input air flow is stable, the oxygen content data detected by the dissolved oxygen meter will fluctuate within a certain range; if the opening of the air regulating valve 23 gradually decays, the input air flow will gradually decrease, and the oxygen content data detected by the dissolved oxygen meter will fluctuate greatly. At this time, the control unit 24 adjusts the opening of the air regulating valve 23 to ensure the stability of the air input flow.

[0049] After the reaction is over, take out the measuring probe and clean it with clean water. This not only avoids the probe from directly contacting the slurry, causing inaccurate measurement, probe corrosion and other adverse factors, but also greatly improves the service life of the dissolved oxygen meter.

[0050] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An online automatic monitoring and adjustment system for slurry oxygen content, characterized in that: The reactor comprises a reaction kettle, wherein an air inlet structure is provided in the reaction kettle for introducing air into the slurry in the reactor, and a pressure relief valve is provided at the air outlet on the top of the reaction kettle; It also includes an oxygen content detection and adjustment device, which includes an extraction device for extracting a portion of the clear liquid in the slurry, a detection device for collecting the oxygen content signal of the clear liquid, an air adjustment valve arranged on the intake pipeline of the intake structure, and a control unit for controlling the opening of the air adjustment valve based on the oxygen content signal.

2. The online automatic monitoring and regulating system for slurry oxygen content according to claim 1 is characterized in that: The air intake structure comprises an air coil, on which air outlet holes are evenly arranged, and the air coil is connected to an air pump outside the reactor through the air intake pipeline.

3. The online automatic monitoring and adjustment system for slurry oxygen content according to claim 1 is characterized in that: The extraction device comprises a self-circulating pipeline, a circulating pump, a branch pipeline, a filter and a clear liquid temporary storage tank; The two ends of the self-circulating pipeline are respectively connected to the slurry outlet and slurry inlet of the reactor; The circulation pump is connected in series to the self-circulation pipeline and is electrically connected to the control unit; The head end of the branch pipeline is connected to the self-circulating pipeline, and the tail end is connected to the clear liquid temporary storage tank; The filter is arranged in the branch pipe.

4. The online automatic monitoring and regulating system for slurry oxygen content according to claim 3 is characterized in that: The branch pipeline is connected to the self-circulating pipeline via a three-way pipe, and the filter is detachably connected in a channel of the three-way pipe connected to the branch pipeline.

5. The online automatic monitoring and regulating system for slurry oxygen content according to claim 4 is characterized in that: The filter screen of the filter is arranged at the entrance of a channel of the three-way pipe.

6. The online automatic monitoring and regulating system for slurry oxygen content according to claim 4 is characterized in that: The diameter of the branch pipeline is smaller than the diameters of the three-way pipe and the self-circulation pipeline.

7. The online automatic monitoring and regulating system for slurry oxygen content according to claim 3 is characterized in that: A liquid outlet is arranged at one side of the bottom of the clear liquid temporary storage tank, and a liquid outlet regulating valve is arranged at the liquid outlet, and the liquid outlet regulating valve is electrically connected to the control unit.

8. The online automatic monitoring and regulating system for slurry oxygen content according to claim 7 is characterized in that: The detection device adopts a dissolved oxygen meter, a measuring probe of which is arranged in the clear liquid temporary storage tank, and the dissolved oxygen meter is electrically connected to the control unit.

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