A biogas purification system with dual liquid level control switching function

Abstract

This utility model discloses a biogas purification system with dual level control switching function, relating to the field of biogas treatment. It includes a biogas purification tower, characterized in that it further includes a differential pressure transmitter remote level gauge and a magnetic float level gauge installed on the outside of the tower. Through the dual control switching system, when one level transmitter fails, the system can quickly switch to another level gauge with a different measurement mode for control, avoiding system shutdown due to uncontrolled level.

Description

Technical Field

[0001] This utility model relates to the field of biogas treatment, specifically a biogas purification system with dual liquid level control switching function. Background Technology

[0002] Existing biogas purification tower liquid level monitoring typically uses magnetic float level gauges for on-site level display and differential pressure transmitter level gauges for automatic remote monitoring and control. These two types of level gauges usually operate independently, making them susceptible to malfunctions in level control due to individual instrument failures. This can lead to problems such as freezing in winter, signal anomalies, and failure to switch back in time, ultimately requiring emergency shutdowns for maintenance and impacting system continuity and efficiency. However, current technologies generally fail to achieve redundant and rapid switching of level detection devices and adaptive fault response. Therefore, there is an urgent need for an improved technical solution that can reliably switch level signals and improve system continuity. Utility Model Content

[0003] The purpose of this utility model is to provide a biogas purification system with dual level control switching function, and to provide a dual level control switching system for use in desulfurization towers, desulfurization regeneration towers, decarbonization towers, flash towers, and decarbonization regeneration towers, which can quickly switch between differential pressure transmitters and magnetic level gauges, perform maintenance without stopping the machine, and provide more accurate measurements.

[0004] The technical solution adopted by this utility model is as follows: a biogas purification system with dual level control switching function, including a biogas purification tower body, characterized in that a differential pressure transmitter remote level gauge and a magnetic float level gauge are respectively installed on the outside of the biogas purification tower body.

[0005] The differential pressure transmitter remote level gauge is connected to the high and low level interfaces of the tower body through two capillary tubes, one for high pressure and one for low pressure.

[0006] The upper and lower ends of the magnetic float level gauge are connected to the level measurement interface of the tower body through liquid inlet pipes, respectively.

[0007] Both the differential pressure transmitter remote level gauge and the magnetic float level gauge are electrically connected to the PLC to realize remote acquisition and control of level signals.

[0008] Furthermore, the high-pressure input port of the differential pressure transmitter remote level gauge is at the same elevation as the upper interface center of the magnetic float level gauge, and the low-pressure input port of the differential pressure transmitter remote level gauge is at the same elevation as the lower interface center of the magnetic float level gauge.

[0009] Furthermore, self-regulating heating cables are laid on the pipeline between the differential pressure transmitter remote level gauge and the biogas purification tower, as well as on the pipeline between the magnetic level gauge and the biogas purification tower. The self-regulating heating cables are covered with insulation cotton.

[0010] Furthermore, valves are installed at the high-pressure and low-pressure input ports of the differential pressure transmitter remote level gauge, as well as at the upper and lower interfaces of the magnetic float level gauge.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] 1) This utility model uses a dual control switching system to quickly switch to another level gauge in a different measurement mode when one level transmitter fails, thus avoiding system shutdown due to uncontrolled liquid level.

[0013] 2) After switching to the level gauge control mode, the decarbonization system can continue to operate normally. Closing the level gauge inlet valve enables non-stop maintenance of the level transmitter, reducing economic losses caused by equipment downtime.

[0014] 3) This utility model combines the measurement principles of magnetic float level gauge and differential pressure transmitter level gauge, which complement and correct each other, effectively preventing the influence of eddies or bubbles on the level measurement value, and significantly improving the accuracy of level measurement;

[0015] 4) This utility model adopts a dual-level detection and switching control structure. When one level detection device malfunctions or errs, the system can automatically or manually switch to the backup level gauge in a timely manner to ensure continuous monitoring, greatly improving the fault tolerance capability of the biogas purification system. Even under abnormal operating conditions such as damage or maintenance of the unit level gauge, the entire system can still maintain normal operation, thereby avoiding production interruptions caused by level signal interruption, ensuring continuous and stable production of the biogas purification process, and thus significantly improving overall production efficiency and economic benefits.

[0016] 5) The switching operation of this utility model is simple. The control mode can be switched manually, which is easy for operators to master and use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Biogas purification tower body; 2. Differential pressure transmitter remote level gauge; 3. Magnetic float level gauge; 4. Self-regulating heating cable; 5. Insulation cotton; 6. Valves. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Example

[0022] Figure 1 As shown: A biogas purification system with dual level control switching function includes a biogas purification tower 1, and a differential pressure transmitter remote level gauge 2 and a magnetic float level gauge 3 are respectively installed on the outside of the biogas purification tower 1.

[0023] The differential pressure transmitter remote level gauge 2 is connected to the high and low level interfaces of the tower body through two capillary tubes, one for high pressure and one for low pressure, respectively.

[0024] The high-pressure port of the differential pressure transmitter remote level gauge 2 is connected to the lower part of the tower body, and the low-pressure port of the differential pressure transmitter remote level gauge 2 is connected to the upper part of the tower body.

[0025] The upper and lower ends of the magnetic float level gauge 3 are connected to the level measurement interface of the tower body through liquid inlet pipes, respectively.

[0026] The upper interface of the magnetic float level gauge 3 is connected to the liquid surface above the tower body, and the lower interface of the magnetic float level gauge 3 is connected to the normal minimum liquid level below the tower body.

[0027] Both the differential pressure transmitter remote level gauge 2 and the magnetic float level gauge 3 are equipped with current output interfaces. Their output signals are led to the analog input module in the PLC control cabinet through field signal cables to realize remote acquisition of level signals. The PLC program can perform master / standby selection on the two level signals according to the set logic to achieve seamless switching of automatic level control.

[0028] The high-pressure input port of the differential pressure transmitter remote level gauge 2 is at the same elevation as the upper interface center of the magnetic float level gauge 3, and the low-pressure input port of the differential pressure transmitter remote level gauge 2 is at the same elevation as the lower interface center of the magnetic float level gauge 3.

[0029] The comparative monitoring is more accurate and facilitates seamless switching of liquid level signals in the control system.

[0030] Magnetic level gauges 3 are installed on various devices in the purification system. Based on the principle of communicating vessels and the magnetic coupling effect, the float moves with the rise and fall of the liquid level, causing the flip plate to rotate, directly reflecting the liquid level height. It is suitable for intuitive display of liquid level height. Due to the structural characteristics of the magnetic flip plate, such as the float that is in direct contact with the medium, it is not sensitive to bubbles. Its measurement value is more stable in the case of bubble interference. The magnetic level gauge 3 adds a remote transmission function, which enables it to convert the liquid level signal into an electrical signal and transmit it to the PLC.

[0031] Simultaneously, a differential pressure transmitter remote level gauge 2 is installed. The differential pressure transmitter remote level gauge 2 calculates the liquid level by measuring the liquid static pressure difference. It adopts a double-flange diaphragm capillary pressure differential pressure transmitter. The closed pipeline filled with silicone oil prevents air bubbles from entering, so as to prevent the carbon dioxide gas dissolved in the process water from accumulating in the pressure tapping pipe when the gas is released due to temperature and pressure changes, causing abnormal fluctuations in the pressure difference signal. The differential pressure transmitter is used for automatic liquid level control during normal operation.

[0032] Self-regulating heating cables 4 are laid on the pipeline between the differential pressure transmitter remote level gauge 2 and the biogas purification tower 1, as well as on the pipeline between the magnetic level gauge 3 and the biogas purification tower 1. The self-regulating heating cables 4 are covered with insulation cotton 5. Valves 6 are installed at the high-pressure and low-pressure input ports of the differential pressure transmitter remote level gauge 2, as well as at the upper and lower interfaces of the magnetic level gauge 3.

[0033] Both sets of level gauges are equipped with valves 6 at the top and bottom. The inlet and outlet of the level gauges are insulated and self-temperature controlled by electric heating to prevent the instruments from failing due to freezing in winter.

[0034] Dual control switching system: Dual control switching logic is set in the PLC. Under normal circumstances, the PLC receives the liquid level signal from the differential pressure transmitter for control.

[0035] When the differential pressure transmitter remote level gauge 2 malfunctions, the signal is switched to the magnetic float level gauge 3 via manual operation, and the PLC receives the level signal from the magnetic float level gauge 3 for control.

[0036] Instability detection and switching mechanism: When the measured value of the differential pressure transmitter remote level gauge 2 fluctuates abnormally, while the measured value of the magnetic float level gauge 3 is relatively stable, it is judged to be bubble interference. The measured value of the magnetic float level gauge 3 is taken as the main value, and the measured value of the differential pressure transmitter remote level gauge 2 is corrected.

[0037] When the measured value of the magnetic float level gauge 3 fluctuates rapidly or remains unchanged for a long time, while the measured value of the differential pressure transmitter remote level gauge 2 is relatively stable, it is judged that the liquid surface eddy current interference or the float is stuck. The measured value of the differential pressure transmitter remote level gauge 2 is taken as the main value, and the measured value of the magnetic float level gauge 3 is corrected.

[0038] The operator can manually switch the control mode of the magnetic level gauge 3 or the differential pressure transmitter remote level gauge 2 according to the instability situation.

[0039] Non-stop maintenance function: After switching to the level gauge control mode, the decarbonization system can continue to operate normally. Closing valve 6 allows for non-stop maintenance.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A biogas purification system with dual level control switching function, comprising a biogas purification tower (1), characterized in that, The outer side of the biogas purification tower (1) is equipped with a differential pressure transmitter remote level gauge (2) and a magnetic float level gauge (3). The differential pressure transmitter remote level gauge (2) is connected to the high and low level interfaces of the tower body through two capillary tubes, one high and one low pressure, respectively. The upper and lower ends of the magnetic float level gauge (3) are connected to the level measurement interface of the tower body through liquid inlet pipes, respectively. The differential pressure transmitter remote level gauge (2) and the magnetic float level gauge (3) are both electrically connected to the PLC to realize remote acquisition and control of level signals.

2. The biogas purification system with dual liquid level control switching function according to claim 1, characterized in that: The high-pressure input port of the differential pressure transmitter remote level gauge (2) is at the same elevation as the upper interface center of the magnetic float level gauge (3), and the low-pressure input port of the differential pressure transmitter remote level gauge (2) is at the same elevation as the lower interface center of the magnetic float level gauge (3).

3. A biogas purification system with dual liquid level control switching function according to claim 2, characterized in that: Self-regulating heating cables (4) are laid on the pipeline between the differential pressure transmitter remote level gauge (2) and the biogas purification tower (1) as well as on the pipeline between the magnetic level gauge (3) and the biogas purification tower (1). The self-regulating heating cables (4) are covered with insulation cotton (5).

4. A biogas purification system with dual liquid level control switching function according to claim 3, characterized in that: Valves (6) are installed at the high pressure port and low pressure port of the differential pressure transmitter remote level gauge (2), as well as at the upper and lower interfaces of the magnetic float level gauge (3).

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