Compressed air system capable of reducing energy consumption for lithium battery diaphragm production

Abstract

The invention relates to a lithium battery diaphragm production compressed air system capable of reducing energy consumption, which comprises an air compressor, an outlet of the air compressor is communicated to a user side after sequentially passing through an air storage tank, a freezing dryer, an oil removal filter and a micro dryer to form a compressed air pipeline; an exhaust pipe of the air compressor is provided with a waste heat recovery port; and the waste heat recovery port is communicated to an inlet of a back flushing pipeline of the micro dryer through a waste heat recovery pipe and a fan, so that a desorption tower in the micro dryer is heated by utilizing high-temperature waste gas in the air compressor. Therefore, an original electric heater can be replaced for heating, the energy consumption is greatly reduced, and the energy utilization rate is improved. Meanwhile, power adjustment of the freezing dryer and switching of the adsorption towers in the micro dryer can be accurately controlled, energy loss caused by control only based on experience in the prior art is eliminated, and favorable conditions are created for effectively achieving energy conservation and environmental protection.

Description

Technical Field

[0001] This invention relates to an industrial apparatus, and more particularly to a compressed air system for lithium battery separator production, specifically a compressed air system for lithium battery separator production that can reduce energy consumption. Background Technology

[0002] Currently, air compressors are mostly used to provide the compressed air required for lithium battery separator production. This compressed air then passes through devices such as refrigerated dryers and micro-dryers to remove moisture and meet production needs.

[0003] During operation, most of the heat generated by the air compressor is directly discharged with the exhaust gas. Simultaneously, an electric heater is required within the micro-dryer for further heating. This increases energy consumption and is detrimental to energy conservation and environmental protection. Furthermore, the switching of the adsorption tower and the adjustment of the refrigerated dryer power in the micro-dryer rely heavily on the operator's experience. This can easily lead to inaccurate timing of adsorption tower switching, resulting in energy waste, or improper adjustment of the refrigerated dryer power, further increasing energy consumption.

[0004] Therefore, improvements are urgently needed to better meet production demands. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a compressed air system for lithium battery separator production that can reduce energy consumption. This system can fully recover waste heat from the exhaust of the air compressor and precisely adjust the power of the refrigerated dryer and the switching of the adsorption tower of the micro dryer, thereby greatly improving energy utilization efficiency, reducing energy consumption, and creating favorable conditions for achieving energy conservation and environmental protection.

[0006] The technical solution of this invention is: A compressed air system for lithium battery separator production that can reduce energy consumption includes an air compressor. The outlet of the air compressor is connected to the user end via an air storage tank, a refrigerated dryer, an oil removal filter, and a micro dryer, forming a compressed air pipeline. The exhaust pipe of the air compressor is equipped with a waste heat recovery port. The waste heat recovery port is connected to the backflush pipe inlet of the micro dryer via a waste heat recovery pipe and a fan, so as to use the high-temperature exhaust gas inside the air compressor to provide the heat required for desorption of moisture from the adsorbent in the micro dryer.

[0007] Furthermore, there are multiple compressed air pipelines; the waste heat recovery port of the air compressor in each compressed air pipeline is connected to the inlet of the fan; it also includes an air distribution box, the inlet of which is connected to the outlet of the fan, and the outlet of which is connected to the backflush pipe inlet of the micro dryer in each of the compressed air pipelines.

[0008] Furthermore, the air compressor is a screw air compressor; the micro-dryer is an adsorption type micro-dryer; the air compressor and the refrigerated dryer are electrically connected to the PLC controller respectively.

[0009] Furthermore, it also includes a main air storage tank, the inlet of which is connected to the compressed air outlet of each of the aforementioned micro dryers, and the outlet of which is connected to one or more user terminals.

[0010] Furthermore, a pressure sensor is installed at the outlet of the main gas storage tank; the pressure sensor is electrically connected to the PLC controller.

[0011] Furthermore, a control valve is provided on the waste heat recovery pipe.

[0012] Furthermore, a first dew point transmitter is installed on the pipeline between the refrigerated dryer and the micro dryer; a second dew point transmitter is installed at the compressed air outlet of the micro dryer; the first dew point transmitter and the second dew point transmitter are electrically connected to the PLC controller respectively.

[0013] Furthermore, an electric heating cable is provided at the connection between the waste heat recovery pipe and the inlet of the backflush pipe of the micro dryer; the electric heating cable is electrically connected to the PLC controller.

[0014] Furthermore, a temperature sensor is installed on the backflush pipe behind the electric heating cable; the temperature sensor is electrically connected to the PLC controller.

[0015] Furthermore, the bottom of the refrigerated dryer is equipped with a zero-air-consumption automatic drain valve.

[0016] The beneficial effects of this invention are: This invention recovers the high-temperature waste heat generated during air compressor operation and uses it as the heating source for the micro-dryer, replacing the original electric heater, which greatly reduces energy consumption and improves energy utilization. Simultaneously, by setting up two dew point transmitters, the power regulation of the refrigerated dryer and the switching of the adsorption tower in the micro-dryer can be precisely controlled, eliminating the energy losses caused by relying solely on experience for control, and creating favorable conditions for effectively achieving energy conservation and environmental protection. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the present invention.

[0018] Among them, 1-air compressor; 2-air tank; 3-refrigerated dryer; 4-zero air consumption automatic drain valve; 5-oil filter; 6-first dew point transmitter; 7-micro dryer; 8-second dew point transmitter; 9-temperature sensor; 10-main air tank; 11-pressure sensor; 12-air distribution box; 13-fan; 14-control valve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown.

[0021] A compressed air system for lithium battery separator production with reduced energy consumption comprises multiple sets of compressed air pipelines. Each set of compressed air pipelines includes, in sequence, an air compressor 1, an air tank 2, a refrigerated dryer 3, an oil removal filter 5, and a micro-dryer 7, and ultimately connects to a main air tank 10. The main air tank 10 is connected to one or more terminals. Preferably, the air compressor 1 is a screw air compressor. The micro-dryer 7 is an adsorption-type micro-dryer with two adsorption towers, allowing for simultaneous adsorption and desorption processes. The refrigerated dryer 3 has a zero-air-consumption automatic drain valve 4 at its bottom, which helps reduce energy consumption.

[0022] A pressure sensor 11 is installed at the outlet of the main gas storage tank 10 to monitor the outlet gas pressure. This pressure sensor 11, along with the air compressor 1 and the refrigerated dryer 3, are electrically connected to a PLC controller for controlled adjustment. Specifically, the PLC controller collects the outlet gas pressure of the main gas storage tank in real time (normal value is greater than 0.75 MPa). When the pressure is less than 0.75 MPa, the PLC controller automatically sends commands to the air compressor 1 and the refrigerated dryer 3 to adjust their operating status, increase their operating power, and ensure stable gas pressure.

[0023] The air compressor 1 has a waste heat recovery port on its exhaust pipe. This port is approximately 1 meter from the exhaust outlet of the exhaust pipe, has a diameter of approximately DN25, and is connected to the inlet of the fan 13 via a waste heat recovery pipe. The outlet of the fan 13 is connected to the inlet of the air distribution box 12. The air distribution box 12 is a hollow box with multiple outlets, each connected to the backflush pipe inlet of a micro-dryer on one of the compressed air pipes. This allows the high-temperature exhaust gas generated by the air compressor 1 during operation to be introduced into the air distribution box 12 via the fan 13, and then distributed by the air distribution box 12 to the corresponding micro-dryer 7. This gas is then sent to the adsorption tower in the regeneration stage of the micro-dryer 7 as a regeneration gas source, providing the necessary heat for the adsorbent to desorb moisture. Preferably, the fan 13 is a Roots blower, which can pressurize while extracting air. Simultaneously, a control valve 14 is provided on the waste heat recovery pipe to control its opening and closing. When an air compressor is shut down for maintenance, the control valve on the waste heat recovery pipe connected to it can be closed to ensure the system operates normally.

[0024] The connection between the waste heat recovery pipe and the inlet of the backflush pipe of the micro-dryer 7 is equipped with a wound electric heating cable, which can be activated to heat the gas entering the backflush pipe when needed. Simultaneously, a temperature sensor 9 is installed on the backflush pipe behind the electric heating cable to monitor the temperature of the gas entering the adsorption tower from the backflush pipe. Both the temperature sensor and the electric heating cable are electrically connected to the PLC controller for automatic control.

[0025] A first dew point transmitter 6 is installed on the pipeline between the refrigerated dryer 3 and the micro dryer 7, and a second dew point transmitter 8 is installed at the compressed air outlet of the micro dryer to monitor the dew point of the gas in the corresponding pipeline and to accurately control the power of the refrigerated dryer 3 and the switching of the adsorption tower in the micro dryer 7. Preferably, both the first dew point transmitter 6 and the second dew point transmitter 8 are insertion type.

[0026] The temperature sensor 9, the first dew point transmitter 6, and the second dew point transmitter 8 are electrically connected to the PLC controller so as to control the power adjustment of the refrigerated dryer and the switching of the adsorption tower of the micro dryer by collecting relevant temperature parameters, thereby achieving automatic control.

[0027] The working process of this invention is as follows: After being compressed by screw air compressor 1, ambient air first enters air storage tank 2 for pressure stabilization and preliminary cooling. Then, the compressed air enters refrigerated dryer 3, where most of the water vapor condenses due to cooling and is discharged via a zero-air-consumption automatic drain valve, achieving primary dehydration. Next, the air is purified by oil filter 5 to remove oil mist and particulate matter, and finally enters adsorption micro-dryer 7 for deep drying, ensuring its pressure dew point remains stable below -40℃ to meet the requirements of high-precision production processes. Finally, the treated compressed air enters the main air storage tank for storage and is distributed according to production needs. During this process, the PLC controller continuously monitors the outlet pressure of the main air storage tank 10 (normal value greater than 0.75 MPa). When the pressure falls below 0.75 MPa, the PLC controller automatically sends commands to air compressor 1 and refrigerated dryer 3 to adjust their operating status, increase operating power, and ensure stable air pressure.

[0028] The high-temperature exhaust gas (70-80℃) generated by the screw air compressor 1 is drawn and pressurized by the Roots blower 13. The pressurized high-temperature gas is distributed through the gas distributor 12 and sent as a regeneration gas source to the adsorption tower in the regeneration stage of the adsorption-type micro-dryer 7. This high-temperature gas provides the heat required for the adsorbent to desorb moisture, replacing the original electric heater. Therefore, energy utilization is effectively improved and production costs are reduced.

[0029] During system operation, the PLC controller monitors the inlet dew point temperature T1 and outlet dew point temperature T2 of the micro-dryer via the first dew point transmitter 6 and the second dew point transmitter 8, respectively. When T1 < -20℃ and T2 > -40℃, the adsorption tower of the micro-dryer is switched, and the original adsorption tower is dried. When T1 ≥ -20℃, the operating power of the refrigerated dryer 3 is increased until the dew point is within acceptable limits. This allows for accurate identification of the specific point of dew point abnormality, enabling targeted adjustments to the corresponding equipment, avoiding misoperation, and effectively reducing energy waste in the process.

[0030] All parts not covered in this invention are the same as or can be implemented using existing technologies.

Claims

1. A compressed air system for lithium battery separator production that reduces energy consumption, comprising an air compressor, the outlet of which sequentially passes through an air storage tank, a refrigerated dryer, an oil removal filter, and a micro dryer before being connected to the user end, forming a compressed air pipeline, characterized in that, The air compressor has a waste heat recovery port on its exhaust pipe; the waste heat recovery port is connected to the backflush pipe inlet of the micro dryer through a waste heat recovery pipe and a fan.

2. The compressed air system for lithium battery separator production that reduces energy consumption according to claim 1, characterized in that, The compressed air pipeline is multiple; the waste heat recovery port of the air compressor in each compressed air pipeline is connected to the inlet of the fan; it also includes an air distribution box, the inlet of which is connected to the outlet of the fan, and the outlet of which is connected to the backflush pipe inlet of the micro dryer in each of the compressed air pipelines.

3. The compressed air system for lithium battery separator production that reduces energy consumption according to claim 1, characterized in that, The air compressor is a screw air compressor; the micro-dryer is an adsorption type micro-dryer; the air compressor and the refrigerated dryer are electrically connected to the PLC controller respectively.

4. The compressed air system for lithium battery separator production that reduces energy consumption according to claim 3, characterized in that, It also includes a main air storage tank, the inlet of which is connected to the compressed air outlet of each of the aforementioned micro dryers, and the outlet of which is connected to one or more user terminals.

5. The compressed air system for lithium battery separator production that reduces energy consumption according to claim 4, characterized in that, A pressure sensor is installed at the outlet of the main gas storage tank; the pressure sensor is electrically connected to the PLC controller.

6. The compressed air system for lithium battery separator production with reduced energy consumption according to claim 1, characterized in that, The waste heat recovery pipe is equipped with a control valve.

7. The compressed air system for lithium battery separator production that reduces energy consumption according to claim 3, characterized in that, A first dew point transmitter is installed on the pipeline between the refrigerated dryer and the micro dryer; a second dew point transmitter is installed at the compressed air outlet of the micro dryer; the first and second dew point transmitters are electrically connected to the PLC controller respectively.

8. The compressed air system for lithium battery separator production with reduced energy consumption according to claim 3, characterized in that, The connection between the waste heat recovery pipe and the inlet of the backflush pipe of the micro dryer is provided with an electric heating cable; the electric heating cable is electrically connected to the PLC controller.

9. The compressed air system for lithium battery separator production with reduced energy consumption according to claim 3, characterized in that, A temperature sensor is installed on the backflush pipe behind the electric heating cable; the temperature sensor is electrically connected to the PLC controller.

10. The compressed air system for lithium battery separator production with reduced energy consumption according to claim 1, characterized in that, The bottom of the refrigerated dryer is equipped with an automatic drain valve with zero air consumption.

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