CN213013123U - Oxygen cathode electrolytic cell oxygen circulation flow accurate control system - Google Patents
Oxygen cathode electrolytic cell oxygen circulation flow accurate control system Download PDFInfo
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- CN213013123U CN213013123U CN202021591367.2U CN202021591367U CN213013123U CN 213013123 U CN213013123 U CN 213013123U CN 202021591367 U CN202021591367 U CN 202021591367U CN 213013123 U CN213013123 U CN 213013123U
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Abstract
The utility model provides an oxygen cathode electrolytic cell oxygen circulation flow accurate control system, which comprises a low-pressure oxygen buffer tank and a high-pressure oxygen buffer tank, wherein the low-pressure oxygen buffer tank or the high-pressure oxygen buffer tank is provided with an air inlet pipeline connected with an oxygen source, the low-pressure oxygen buffer tank is provided with an air return pipeline connected with the electrolytic cell, the high-pressure oxygen buffer tank is provided with an air supply pipeline communicated with the electrolytic cell, and the air supply pipeline is provided with a gas flowmeter; a forward gas transmission pipeline and a return circulation pipeline are arranged between the low-pressure oxygen buffer tank and the high-pressure oxygen buffer tank, a circulating fan is arranged on the forward gas transmission pipeline, and a return proportional valve is arranged on the return circulation pipeline; the gas flowmeter and the first controller of the backflow proportional valve are electrically connected, and the first controller is used for controlling the opening and closing degree of the backflow proportional valve based on preset control logic according to flow data collected by the gas flowmeter so as to control the backflow amount of the circulating fan. The system has small volume, easy installation, low cost and energy consumption, and can improve the control precision and sensitivity of the oxygen circulation flow.
Description
Technical Field
The utility model relates to an accurate control of gas diffusion cathode electrolytic cell equipment cathode gas circulation flow especially is applied to the little flow accurate control of high concentration gas circulation flow.
Background
The oxygen cathode is an ion membrane electrolysis technology with a brand-new concept, and due to the excellent performance of the oxygen cathode in the aspects of energy saving and environmental protection, the oxygen cathode draws wide attention at home and abroad since its birth. The oxygen cathode electrolytic cell is widely applied to the industrial fields of alkali preparation, hydrogen peroxide preparation and the like.
When the oxygen cathode electrolytic cell is operated, a certain amount of oxygen needs to be introduced, and the flow of the introduced oxygen needs to be accurately adjusted. In the prior art, a pneumatic or electric actuator and a flow meter are generally adopted to form a PID single loop for oxygen flow regulation, wherein the used actuator is a pneumatic regulating valve or an electric regulating valve, and the two actuators have large volumes (>100x130x200mm), are inconvenient to install, have high price, have small adjustable ratio (<100:1) and have poor small flow regulation precision. In addition, the operation of the pneumatic regulating valve requires dry instrument wind to drive the operation of the pneumatic regulating valve, and devices or equipment without instrument wind cannot be used. The electric regulating valve has the advantages of high operation energy consumption (>35w), low regulating speed, low sensitivity (> 1% FS), long time consumption for PID manual parameter setting, high requirement on experience of a set person, and incapability of achieving good control effect of the set PID parameter under different target flow values.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem lie in providing a small easy installation, cost and energy consumption low, and can improve the control accuracy of oxygen circulation flow and the accurate control system of oxygen cathode electrolysis cell oxygen circulation flow of sensitivity.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an oxygen cathode electrolytic cell oxygen circulation flow accurate control system comprises a low-pressure oxygen buffer tank and a high-pressure oxygen buffer tank, wherein the low-pressure oxygen buffer tank or the high-pressure oxygen buffer tank is provided with an air inlet pipeline connected with an oxygen source, the low-pressure oxygen buffer tank is provided with an air return pipeline connected with an electrolytic cell, the high-pressure oxygen buffer tank is provided with an air supply pipeline communicated with the electrolytic cell, and the air supply pipeline is provided with a gas flowmeter; a forward gas transmission pipeline and a return circulation pipeline are arranged between the low-pressure oxygen buffer tank and the high-pressure oxygen buffer tank, a circulating fan is arranged on the forward gas transmission pipeline, and a return proportional valve is arranged on the return circulation pipeline; the first controller is used for controlling the opening and closing degree of the backflow proportional valve based on preset control logic according to flow data collected by the gas flowmeter so as to control the backflow amount of the circulating fan.
Further, an exhaust pipeline is further arranged at the bottom of the high-pressure oxygen buffer tank, an exhaust proportional valve is arranged on the exhaust pipeline, and a pressure sensor is further arranged on the low-pressure oxygen buffer tank; the low-pressure buffer tank is characterized by further comprising a second controller, wherein the second controller is electrically connected with the pressure sensor and the exhaust proportional valve and used for controlling the opening and closing degree of the exhaust proportional valve based on preset control logic according to pressure data collected by the pressure sensor so as to control the pressure of the low-pressure buffer tank to be constant.
Preferably, the specifications of the reflux proportional valve and the exhaust proportional valve are the same, the volume is 55x64x104.5mm, the sensitivity is 0.25% FS, and the adjustable ratio is 200: 1, response time 25 ms.
As a preferred embodiment, the first controller and the second controller are a PLC or a single chip microcomputer.
Furthermore, a tee joint is arranged between the outlet of the circulating fan and the inlet of the high-pressure oxygen buffer tank of the forward gas transmission pipeline, and the third port of the tee joint is connected with an exhaust solenoid valve.
Furthermore, a flow controller is arranged on the air inlet pipeline.
Furthermore, an air supply electric valve is arranged on the air supply pipeline behind the gas flowmeter.
The utility model discloses an oxygen cathode electrolysis cell oxygen circulation flow accurate control system has control accuracy and sensitivity height, and the running cost is low, the energy consumption is low, the executor is small easily to be installed, and does not receive the advantage of instrument wind restriction, can realize the accurate control of the oxygen flow of the electrolysis cell negative pole of sending into to and the pressure of low pressure oxygen buffer tank jar is invariable, thereby keeps circulating oxygen's high concentration, has promoted the high-efficient operation of electrolysis cell.
Drawings
FIG. 1 is a schematic diagram showing the composition and connection relationship of a first embodiment of the system for precisely controlling the oxygen circulation flow of an oxygen cathode electrolytic cell according to the present invention.
FIG. 2 is a schematic diagram showing the composition and connection relationship of a second embodiment of the system for precisely controlling the oxygen circulation flow rate of an oxygen cathode electrolytic cell according to the present invention.
Detailed Description
For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an accurate control system for oxygen circulation flow of an oxygen cathode electrolytic cell, including: a low-pressure oxygen buffer tank V101 provided with a gas return line connected with the electrolytic cell; the high-pressure oxygen buffer tank V102 is provided with an air inlet pipeline connected with an oxygen source and an air supply pipeline leading to the electrolytic bath, and the air inlet pipeline is provided with a flow controller FIT 106; the gas flow meter FIT105 and the gas supply electric valve XV1313 are arranged on the gas supply pipeline.
Alternatively, as shown in fig. 2, the air inlet pipeline may be disposed on the low-pressure oxygen buffer tank V101 according to the pressure of the oxygen source, and the position of the air inlet pipeline does not affect the function of the whole system. The oxygen source may be an oxygen generator, liquid oxygen, or oxygen from a cylinder, and is not particularly limited herein.
A forward gas pipeline and a return circulation pipeline are arranged between the low-pressure oxygen buffer tank V101 and the high-pressure oxygen buffer tank V102. Wherein, a circulating fan P105 is arranged on the positive gas transmission pipeline, and a reflux proportional valve FV105 is arranged on the reflux circulating pipeline. The device also comprises a first controller FIC105 electrically connected with the gas flow meter FIT105 and the backflow proportional valve FV105, wherein the first controller FIC105 is used for controlling the opening and closing degree of the backflow proportional valve FV105 based on preset control logic according to flow data collected by the gas flow FIT105 so as to control the backflow amount P105 of the circulating fan, and further realize the accurate adjustment of the flow rate of oxygen (FIT105) fed into the electrolytic cell.
Furthermore, a tee joint is arranged between the outlet of the circulating fan P105 and the inlet of the high-pressure oxygen buffer tank V102 on the positive air conveying pipeline, and the third port of the tee joint is connected with an exhaust electromagnetic valve XV 1309.
At the bottom of the high-pressure oxygen buffer tank V102, an exhaust pipeline is further arranged, and an exhaust proportional valve PV102 is arranged on the exhaust pipeline. The system also comprises a second controller PIC102, wherein the second controller PIC102 is electrically connected with an exhaust proportional valve PV102 and a pressure sensor PIT102 installed on the low-pressure oxygen buffer tank V101, and is used for controlling the opening and closing degree of the exhaust proportional valve PV102 based on preset logic according to the pressure value acquired by the pressure sensor PIT102, further controlling the pressure of the high-pressure oxygen buffer tank V102 to be constant, discharging the oxygen except the oxygen consumed by the electrolytic cell and the redundant volume, and achieving the purpose of keeping the oxygen concentration by replacing the oxygen in the circulating system.
In this embodiment, the reflux and exhaust pipelines adopt proportional valves with the same specification, the volume of the proportional valve is 55x64x104.5mm, the sensitivity is 0.25% FS, and the adjustable ratio is 200: 1, response time is 25ms, compares current pneumatic control valve or electric control valve and has small easily the installation, and control accuracy and sensitivity are high, and running cost and energy consumption are low advantage.
In this embodiment, the first controller FIC105 and the second controller PIC102 are preferably a PLC or a single chip microcomputer. In operation, the flow of oxygen into the cell is measured in real time by the gas flow meter FIT105 and the measurement signal is fed back to the first controller FIC 105. The first controller FIC105 compares the real-time measured value of the oxygen flow with the set value of the oxygen flow, and performs PID operation to output a real-time driving signal to control the opening of the reflux proportional valve FV105, so as to realize accurate control of the oxygen circulation flow and further realize accurate regulation of the oxygen flow (FIT105) sent into the electrolytic cell. Correspondingly, the second controller PIC102 can control the opening and closing degree of the exhaust proportional valve PV102 according to the pressure data collected by the pressure sensor PIT102, so as to control the pressure of the low-pressure buffer tank V101 to be constant, and further ensure the high concentration of oxygen in the system.
In the oxygen circulation flow control process of actual production, according to a target set flow value required by process requirements, optimal PID parameters matched with the optimal PID parameters are calculated in the debugging process, and the calculated PID parameters are written into a controller to form preset logic so as to realize high-precision control.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (7)
1. An accurate control system of oxygen cathode electrolytic cell oxygen circulation flow is characterized in that: the device comprises a low-pressure oxygen buffer tank and a high-pressure oxygen buffer tank, wherein the low-pressure oxygen buffer tank or the high-pressure oxygen buffer tank is provided with an air inlet pipeline connected with an oxygen source, the low-pressure oxygen buffer tank is provided with an air return pipeline connected with an electrolytic bath, the high-pressure oxygen buffer tank is provided with an air supply pipeline communicated with the electrolytic bath, and the air supply pipeline is provided with a gas flowmeter; a forward gas transmission pipeline and a return circulation pipeline are arranged between the low-pressure oxygen buffer tank and the high-pressure oxygen buffer tank, a circulating fan is arranged on the forward gas transmission pipeline, and a return proportional valve is arranged on the return circulation pipeline; the first controller is used for controlling the opening and closing degree of the backflow proportional valve based on preset control logic according to flow data collected by the gas flowmeter so as to control the backflow amount of the circulating fan.
2. The system for precisely controlling the oxygen circulation flow of an oxygen cathode electrolytic cell according to claim 1, wherein: the bottom of the high-pressure oxygen buffer tank is also provided with an exhaust pipeline, the exhaust pipeline is provided with an exhaust proportional valve, and the low-pressure oxygen buffer tank is also provided with a pressure sensor; the low-pressure buffer tank is characterized by further comprising a second controller, wherein the second controller is electrically connected with the pressure sensor and the exhaust proportional valve and used for controlling the opening and closing degree of the exhaust proportional valve based on preset control logic according to pressure data collected by the pressure sensor so as to control the pressure of the low-pressure buffer tank to be constant.
3. The system for precisely controlling the oxygen circulation flow of an oxygen cathode electrolytic cell according to claim 2, wherein: the specifications of the reflux proportional valve and the exhaust proportional valve are the same, the volume is 55x64x104.5mm, the sensitivity is 0.25% FS, and the adjustable ratio is 200: 1, response time 25 ms.
4. The system for precisely controlling the oxygen circulation flow of an oxygen cathode electrolytic cell according to claim 2, wherein: the first controller and the second controller are PLC or single chip microcomputer.
5. The oxygen cathode electrolysis cell oxygen circulation flow accurate control system of any one of claims 1-4 wherein: and a tee joint is arranged between the outlet of the circulating fan and the inlet of the high-pressure oxygen buffer tank of the forward gas transmission pipeline, and the third port of the tee joint is connected with an exhaust solenoid valve.
6. The system for precisely controlling the oxygen circulation flow of an oxygen cathode electrolytic cell according to claim 5, wherein: and the air inlet pipeline is provided with a flow controller.
7. The system for precisely controlling the oxygen circulation flow of an oxygen cathode electrolytic cell according to claim 5, wherein: an air supply electric valve is arranged on the air supply pipeline behind the gas flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021591367.2U CN213013123U (en) | 2020-08-04 | 2020-08-04 | Oxygen cathode electrolytic cell oxygen circulation flow accurate control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021591367.2U CN213013123U (en) | 2020-08-04 | 2020-08-04 | Oxygen cathode electrolytic cell oxygen circulation flow accurate control system |
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| CN213013123U true CN213013123U (en) | 2021-04-20 |
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| CN202021591367.2U Active CN213013123U (en) | 2020-08-04 | 2020-08-04 | Oxygen cathode electrolytic cell oxygen circulation flow accurate control system |
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