Online automatic constant-pressure nitrogen supply device for nitrogen supply of fractionating column

Abstract

The utility model discloses a kind of online automatic fractionating column nitrogen constant-pressure nitrogen supply devices, belong to nitrogen pressure control technical field, including multiple fractionating columns, multiple the fractionating column outlet is respectively connected with first stop valve and second stop valve by pipeline, multiple the first stop valve is connected with first gas holder by pipeline series connection, multiple the second stop valve is connected with second gas holder by pipeline series connection, the first gas holder and second gas holder outlet are connected with automatic constant-pressure regulating valve by pipeline, the other end of the automatic constant-pressure regulating valve is connected with differential pressure transmitter by pipeline, the other end of the differential pressure transmitter is connected with flowmeter by pipeline, the other end of the flowmeter is connected with tin tank workshop by pipeline, the fractionating column outlet section pipeline is provided with pressure sensor. The utility model can monitor pressure change in real time, automatically adjust supply pressure, ensure the constant-pressure supply of nitrogen output.

Description

Technical Field

[0001] This utility model belongs to the field of nitrogen pressure control technology, specifically relating to an online automated nitrogen constant pressure supply device for a fractionation tower. Background Technology

[0002] With the rapid development of industries such as chemical, pharmaceutical, and electronics, the demand for high-purity nitrogen is increasing daily. Traditional nitrogen supply methods rely heavily on time-consuming and labor-intensive manual operations, resulting in defects such as unstable gas pressure, low control precision, and slow response, making it difficult to meet the automation, continuity, and stability requirements of industrial production. As a crucial piece of equipment for nitrogen purification, the stability of nitrogen pressure in the fractionation tower is particularly critical for ensuring product quality and production efficiency. Current technologies often employ manual pressure adjustment or single regulating devices for nitrogen supply, making it difficult to achieve cyclic automatic adjustment, leading to problems such as large pressure fluctuations, significant control discrepancies, and system response lag.

[0003] Chinese Patent CN220911124U discloses a nitrogen supply system for a production line, comprising a gas-using mechanism, which includes a gas-using pipeline; the gas-using pipeline is connected to a fractionation tower supply unit and a nitrogen storage tank supply unit; the fractionation tower supply unit includes a fractionation tower, which is connected to the gas-using pipeline via a pipeline mechanism; the nitrogen storage tank supply unit includes a liquid nitrogen storage unit, which is connected to the gas-using pipeline via a liquid nitrogen vaporization pipeline; the liquid nitrogen vaporization pipeline is connected to the gas-using pipeline via a first control valve body mechanism; the first control valve body mechanism includes a bridging pipeline, and the liquid nitrogen vaporization pipeline is connected to the gas-using pipeline via the bridging pipeline; a first control valve is provided on the bridging pipeline.

[0004] In the above technical solution, the gas enters the storage tank and is controlled by only a single control valve, which cannot achieve feedback regulation, that is, it cannot achieve the function of constant pressure nitrogen supply. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an online automated fractionation tower nitrogen constant pressure supply device that can monitor pressure changes in real time, automatically adjust the supply pressure, and ensure a constant pressure supply of nitrogen output.

[0006] The technical solution adopted in this utility model is an online automated nitrogen constant pressure supply device for fractionation towers, comprising multiple fractionation towers. The outlets of the multiple fractionation towers are respectively connected to a first shut-off valve and a second shut-off valve via pipelines. The multiple first shut-off valves are connected in series to a first gas storage tank via pipelines. The multiple second shut-off valves are connected in series to a second gas storage tank via pipelines. The outlets of the first gas storage tank and the second gas storage tank are connected to an automatic constant pressure regulating valve via pipelines. The other end of the automatic constant pressure regulating valve is connected to a differential pressure transmitter via a pipeline. The other end of the differential pressure transmitter is connected to a flow meter via a pipeline. The other end of the flow meter is connected to a tin bath workshop via a pipeline. A pressure sensor is installed at the outlet section of the fractionation tower pipeline.

[0007] The present invention is further characterized in that,

[0008] The pressure sensor, automatic constant pressure regulating valve, differential pressure transmitter, and flow meter are all electrically connected to the control system.

[0009] The control system includes a data receiving module, a control module, and a feedback module.

[0010] The data receiving module is used to receive pressure data measured by the pressure sensor. The control module is used to compare the data measured by the flow meter with the preset data to control the opening of the automatic constant pressure regulating valve. The feedback module is used to provide feedback on the control actions of the control module.

[0011] The automatic constant pressure regulating valve includes a multi-stage pressure reducing valve and a proportional regulating valve.

[0012] The pressure sensor integrates a temperature compensation unit.

[0013] The beneficial effects of this utility model are:

[0014] (1) In the present invention, an automatic constant pressure regulating valve combined with a pressure sensor and a flow meter in an online automated fractionation tower nitrogen constant pressure supply device monitors and adjusts the system pressure in real time to ensure stable nitrogen pressure.

[0015] (2) In the online automated fractionation tower nitrogen constant pressure supply device of this utility model, data acquisition and control feedback are realized through the electronic control system, which facilitates remote monitoring and automatic optimization and improves the overall production automation level.

[0016] (3) The present invention has a built-in temperature compensation unit in an online automated fractionation tower nitrogen constant pressure supply device to improve the pressure measurement accuracy under different temperature environments. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an online automated nitrogen constant pressure supply device for a fractionation tower according to this utility model;

[0018] Figure 2 This is a block diagram of the control system of an online automated nitrogen constant pressure supply device for a fractionation tower according to this utility model.

[0019] In the diagram, 1. distillation tower, 2. first shut-off valve, 3. second shut-off valve, 4. first gas storage tank, 5. second gas storage tank, 6. automatic constant pressure regulating valve, 7. differential pressure transmitter, 8. flow meter, and 9. pressure sensor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1:

[0021] like Figure 1-2 As shown, this utility model discloses an online automated nitrogen constant pressure supply device for fractionation towers, including multiple fractionation towers 1. The outlet of each fractionation tower 1 is connected to a first shut-off valve 2 and a second shut-off valve 3 via pipelines, which are used to achieve independent control and switching of the nitrogen channel at the outlet of each fractionation tower. Multiple first shut-off valves 2 are connected in series to a first gas storage tank 4 via pipelines, and multiple second shut-off valves 3 are connected in series to a second gas storage tank 5 via pipelines, which are used to store and buffer nitrogen from each fractionation tower, thereby achieving a stable gas supply and fault redundancy design. The outlets of the first gas storage tank 4 and the second gas storage tank 5 are connected to an automatic constant pressure regulating valve 6 via pipelines. This regulating valve can automatically adjust the nitrogen supply pressure in real time according to the downstream pressure to maintain a constant pressure state of the overall nitrogen output of the system and ensure stable operation of the subsequent gas consumption end.

[0022] The other end of the automatic constant pressure regulating valve 6 is connected to a differential pressure transmitter 7 via a pipeline. This transmitter is used to monitor the pressure difference before and after the constant pressure device in real time and provide feedback signals for pressure control to assist the regulating valve in accurately controlling the output pressure. The differential pressure transmitter 7 is further connected to a flow meter 8 to monitor the actual nitrogen flow rate output to the downstream system, ensuring that the gas supply meets production needs and providing flow data for monitoring and fault analysis. The outlet of the flow meter 8 is connected to the tin bath workshop via a pipeline to realize the stable delivery of nitrogen to the tin bath process area to protect the surface of the molten metal and prevent oxidation reaction.

[0023] In addition, to achieve precise monitoring of the outlet pressure of the fractionation tower, a pressure sensor 9 is installed at the pipeline of the outlet section of each fractionation tower 1 to monitor the pressure status inside the tower and at its outlet in real time. When abnormal pressure fluctuations are detected, the corresponding shut-off valve can be closed or the constant pressure output strategy can be adjusted to effectively prevent abnormal nitrogen supply caused by fluctuations in the fractionation process.

[0024] The pressure sensor 9, automatic constant pressure regulating valve 6, differential pressure transmitter 7, and flow meter 8 are all electrically connected to the control system. The control system can receive data collected by each sensing element in real time and perform intelligent control of the automatic regulating components to achieve closed-loop feedback regulation and precise management of the system. The control system is equipped with a programmable logic controller (PLC) and combines software algorithms to analyze, judge, and respond to pressure, differential pressure, and flow data to ensure that the entire nitrogen supply system is in a stable, efficient, and safe operating state.

[0025] The control system includes a data receiving module, a control module, and a feedback module.

[0026] The data receiving module receives real-time pressure data measured by pressure sensor 9, processes the data initially, and transmits it to the control system for dynamic monitoring of the nitrogen supply system's pressure status. The control module receives and analyzes the actual flow data collected by flow meter 8, compares it with the system's preset target flow data, and dynamically adjusts the opening of automatic constant pressure regulating valve 6 based on the deviation, thereby achieving precise control of nitrogen supply pressure and flow. The feedback module monitors and records the adjustment commands issued by the control module and their corresponding execution results, and feeds back the control actions and their effects to the data receiving module and the control module, forming a data closed loop within the system and improving adjustment accuracy and response efficiency.

[0027] The automatic constant pressure regulating valve 6 includes a multi-stage pressure reducing valve and a proportional regulating valve. The multi-stage pressure reducing valve is used to reduce the pressure of high-pressure nitrogen in stages. By reducing the gas pressure step by step, it effectively reduces the flow velocity impact and pressure fluctuation caused by single-stage pressure reduction, ensuring that the entire pressure reduction process is stable and controllable. The proportional regulating valve is set after the multi-stage pressure reducing valve and can be continuously and finely adjusted according to the command signal from the control system. Its opening degree can be dynamically adjusted according to the real-time pressure and flow required by the system, thereby achieving high-precision constant pressure output control.

[0028] The pressure sensor 9 integrates a high-precision temperature compensation unit. This unit monitors real-time temperature changes in the sensor's environment or medium and dynamically corrects the pressure measurement based on a built-in calibration algorithm, effectively eliminating errors caused by temperature drift in the pressure reading. The temperature compensation unit maintains the linearity and stability of the sensor output over a wide operating temperature range, ensuring high-precision pressure monitoring even under conditions of frequent temperature changes or alternating high and low temperatures.

[0029] Working Principle: Nitrogen gas from multiple fractionation towers 1 is sequentially controlled at the outlet by the first shut-off valve 2 and the second shut-off valve 3, enabling independent switching and fault isolation of the nitrogen gas channel for each fractionation tower 1. The gas is then collected in the first gas storage tank 4 and the second gas storage tank 5 for storage and buffering, ensuring a stable gas supply and redundancy. After the outlets of the two gas storage tanks merge, the gas enters the automatic constant pressure regulating valve 6. The automatic constant pressure regulating valve 6 is equipped with a multi-stage pressure reducing valve and a proportional regulating valve. The former steadily reduces the pressure of the high-pressure nitrogen in stages, while the latter precisely adjusts the outlet pressure in real time according to the control system commands, achieving constant pressure output. The regulated nitrogen gas then passes through the differential pressure transmitter 7 and the flow meter 8, which monitor the system differential pressure and gas supply flow rate in real time and transmit the collected data to the control system. Each fractionation tower 1 outlet pipe is also equipped with a pressure sensor 9 with an integrated temperature compensation unit, which can accurately monitor the pressure status and eliminate the interference of temperature drift on the readings. All sensing elements are electrically connected to the central control system, which includes data receiving, control, and feedback modules. Through PLC logic control and algorithm analysis, it achieves closed-loop regulation and intelligent response of pressure, flow rate, and differential pressure. Finally, constant-pressure and constant-flow nitrogen gas is stably delivered to the tin bath workshop to provide a protective atmosphere for the molten metal, effectively preventing oxidation reactions and ensuring production continuity and product quality.

[0030] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An online automated nitrogen constant-pressure supply device for a fractionation tower, characterized in that, The system includes multiple fractionation towers (1), each of which is connected to a first shut-off valve (2) and a second shut-off valve (3) via pipelines. The first shut-off valves (2) are connected in series to a first gas storage tank (4), and the second shut-off valves (3) are connected in series to a second gas storage tank (5). The outlets of the first gas storage tank (4) and the second gas storage tank (5) are connected in series to an automatic constant pressure regulating valve (6) via pipelines. The other end of the automatic constant pressure regulating valve (6) is connected to a differential pressure transmitter (7) via pipelines. The other end of the differential pressure transmitter (7) is connected to a flow meter (8) via pipelines. The other end of the flow meter (8) is connected to a tin bath workshop via pipelines. A pressure sensor (9) is installed at the outlet section of the fractionation tower (1).

2. The online automated nitrogen constant pressure supply device for a fractionation tower according to claim 1, characterized in that, The pressure sensor (9), automatic constant pressure regulating valve (6), differential pressure transmitter (7) and flow meter (8) are all electrically connected to the control system.

3. The online automated nitrogen constant pressure supply device for a fractionation tower according to claim 2, characterized in that, The control system includes a data receiving module, a control module, and a feedback module.

4. The online automated nitrogen constant pressure supply device for a fractionation tower according to claim 3, characterized in that, The data receiving module is used to receive the pressure data measured by the pressure sensor (9), the control module is used to compare the data measured by the flow meter (8) with the preset data to control the opening of the automatic constant pressure regulating valve (6), and the feedback module is used to provide feedback on the control action of the control module.

5. The online automated nitrogen constant pressure supply device for a fractionation tower according to claim 4, characterized in that, The automatic constant pressure regulating valve (6) includes a multi-stage pressure reducing valve and a proportional regulating valve.

6. The online automated nitrogen constant pressure supply device for a fractionation tower according to claim 5, characterized in that, The pressure sensor (9) integrates a temperature compensation unit.

Images