Automatic adjusting system for concentrated sulfuric acid used in chlorine drying

Abstract

The utility model relates to a kind of concentrated sulphuric acid automatic regulating system applied to chlorine drying, belong to chlor-alkali industry automation control technical field.The system is integrated multiple sensors and actuator in chlorine drying process, including chlorine flowmeter, dilute sulphuric acid concentration analyzer, dilute sulphuric acid pneumatic regulating valve, filler drying tower liquid level transmitter, concentrated sulphuric acid overflow regulating valve, bubble cap drying tower liquid level transmitter, concentrated sulphuric acid flowmeter, concentrated sulphuric acid frequency conversion pump and chlorine online moisture analyzer, all components are electrically connected to DCS control system.System is based on real-time monitoring chlorine flow, dilute sulphuric acid concentration, tower liquid level and chlorine water content and other parameters, realize accurate control and stable operation.The utility model solves the prior art in concentrated sulphuric acid addition amount precision low, drying effect fluctuation, artificial operation dependency and other problems, significantly improve chlorine drying efficiency, reduce acid liquid waste and equipment corrosion risk, with higher practicality and economy.

Description

Technical Field

[0001] This utility model belongs to the field of automation control technology in the chlor-alkali industry, and in particular relates to an automatic adjustment system for concentrated sulfuric acid used in chlorine drying. Background Technology

[0002] In the chlor-alkali industry and chlorine-related production processes, chlorine drying is a crucial step in ensuring the safe operation of subsequent equipment and meeting product quality standards. Concentrated sulfuric acid, due to its strong hygroscopic properties, is widely used as an adsorbent for chlorine drying. However, existing chlorine drying processes mostly rely on manual control of concentrated sulfuric acid addition, which presents the following significant problems: 1. Low control precision: It is impossible to dynamically adjust the amount of concentrated sulfuric acid added according to the real-time flow rate of chlorine, water content and dilute sulfuric acid concentration. This can easily lead to insufficient addition (incomplete drying, chlorine carrying water corroding pipes and equipment) or excessive addition (resulting in waste of concentrated sulfuric acid and increasing waste acid treatment costs).

[0003] 2. Poor stability: Manual operation relies on experience and is affected by factors such as operator habits and fatigue, resulting in fluctuations in the amount of concentrated sulfuric acid added, inconsistent drying effects, and increased production risks in downstream processes.

[0004] While some existing automated control schemes exist, they are mostly limited to single-parameter adjustment and lack multi-parameter collaborative control and real-time feedback mechanisms, making it difficult to achieve precise and stable drying results. Therefore, there is an urgent need for an automated adjustment system integrating multiple sensors and based on dynamic algorithms to overcome the aforementioned technical bottlenecks. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model aims to provide an automatic concentrated sulfuric acid adjustment system for chlorine drying, solving the problems of low accuracy in the addition of concentrated sulfuric acid and difficulty in ensuring the stability and consistency of the production process in the manual control mode of adding concentrated sulfuric acid.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: An automatic adjustment system for concentrated sulfuric acid used in chlorine drying is provided, including a DCS control system and a chlorine flow meter, a packed drying tower level transmitter, a dilute sulfuric acid pneumatic regulating valve, a concentrated sulfuric acid overflow regulating valve, a bubble cap drying tower level transmitter, a concentrated sulfuric acid flow meter, a concentrated sulfuric acid frequency converter pump, an online chlorine moisture analyzer, and a dilute sulfuric acid concentration analyzer, all electrically connected to the DCS control system. The chlorine flow meter is installed on the inlet pipe of the packed drying tower; the level transmitter of the packed drying tower is installed at the bottom of the packed drying tower; the dilute sulfuric acid pneumatic regulating valve is installed on the pipe between the packed drying tower and the dilute sulfuric acid storage tank; the concentrated sulfuric acid overflow regulating valve is installed on the pipe between the packed drying tower and the bubble cap drying tower; the level transmitter of the bubble cap drying tower is installed at the bottom of the bubble cap drying tower; the concentrated sulfuric acid flow meter and the concentrated sulfuric acid frequency converter are installed on the pipe between the bubble cap drying tower and the concentrated sulfuric acid storage tank; the online chlorine moisture analyzer is installed on the outlet pipe of the bubble cap drying tower; and the dilute sulfuric acid concentration analyzer is installed on the outlet pipe of the packed drying tower.

[0007] Furthermore, the DCS control system also includes a human-machine interface module for displaying real-time parameters, setting control thresholds and alarm information, and supporting manual and automatic mode switching.

[0008] Furthermore, the concentrated sulfuric acid flow meter and the concentrated sulfuric acid frequency converter are interlocked.

[0009] Furthermore, the dilute sulfuric acid concentration analyzer is interlocked with the dilute sulfuric acid pneumatic regulating valve and the level transmitter of the packed drying tower.

[0010] The beneficial effects of this utility model are as follows: This invention relates to an automatic concentrated sulfuric acid adjustment system for chlorine drying. Through real-time data from multiple sensors and a dynamic algorithm, the system precisely matches the amount of concentrated sulfuric acid added to the chlorine drying requirements, increasing acid utilization by 15%-20% and maintaining the chlorine outlet humidity stably below 50 ppm. It replaces manual operation, reduces human error, lowers the drying effect fluctuation from ±8% to ±2%, reduces downstream pipeline corrosion by 30%, and extends equipment maintenance cycles by 50%. This reduces concentrated sulfuric acid waste and waste acid treatment costs, improving production efficiency and economic benefits. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an automatic sulfuric acid regulating system used for chlorine drying.

[0012] The components include: 1. Chlorine flow meter; 2. Packed drying tower level transmitter; 3. Dilute sulfuric acid pneumatic regulating valve; 4. Concentrated sulfuric acid overflow regulating valve; 5. Bubble drying tower level transmitter; 6. Concentrated sulfuric acid flow meter; 7. Concentrated sulfuric acid frequency converter pump; 8. Chlorine online moisture analyzer; 9. Dilute sulfuric acid concentration analyzer; 10. DCS control system; 11. Packed drying tower; 12. Bubble drying tower. Detailed Implementation

[0013] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All inventions utilizing the concept of this utility model are protected.

[0014] like Figure 1 As shown, this embodiment provides an automatic concentrated sulfuric acid control system for chlorine drying, including a DCS control system 10 and a chlorine flow meter 1, a packed drying tower level transmitter 2, a dilute sulfuric acid pneumatic control valve 3, a concentrated sulfuric acid overflow control valve 4, a bubble cap drying tower level transmitter 5, a concentrated sulfuric acid flow meter 6, a concentrated sulfuric acid frequency converter pump 7, an online chlorine moisture analyzer 8, and a dilute sulfuric acid concentration analyzer 9, all electrically connected to the DCS control system 10. The chlorine flow meter 1 can be an Endress+Hauser Proline Promass 83F Coriolis mass flow meter. This chlorine flow meter 1 is installed on the inlet pipe of the packed drying tower 11 to monitor the chlorine flow rate in real time.

[0015] The level transmitter 2 of the packed drying tower can be a Rosemount 3051S differential pressure transmitter, which is installed at the bottom of the packed drying tower 11 to monitor the liquid level inside the tower. The dilute sulfuric acid pneumatic regulating valve 3 can be a Fisher GX pneumatic diaphragm regulating valve, installed on the pipeline between the packed drying tower 11 and the dilute sulfuric acid storage tank. The dilute sulfuric acid concentration analyzer 9 is installed on the outlet pipeline of the packed drying tower 11. The dilute sulfuric acid concentration analyzer 9 can be an Anton Paar L-Com 5530 online concentration meter. Specifically, the dilute sulfuric acid concentration analyzer 9 is interlocked with the dilute sulfuric acid pneumatic regulating valve 3 and the level transmitter 2 of the packed drying tower to dynamically adjust the discharge rate according to the concentration change, preventing the accumulation of dilute sulfuric acid from affecting the drying efficiency. The concentrated sulfuric acid overflow regulating valve 4 can be a Samson Type 3241 pneumatic diaphragm regulating valve, installed on the pipeline between the packed drying tower 11 and the bubble cap drying tower 12; the bubble cap drying tower level transmitter 5 can be an Endress+Hauser Cerabar S PMP71 pressure transmitter, installed at the bottom of the bubble cap drying tower 12; the bubble cap drying tower level transmitter 5 is interlocked with the concentrated sulfuric acid overflow regulating valve 4, controlling the overflow based on the liquid level signal. This maintains a stable liquid level in the bubble cap drying tower 12, avoids overflow interruption, and ensures continuous overflow of concentrated sulfuric acid.

[0016] The pipeline between the bubble drying tower 12 and the concentrated sulfuric acid storage tank is equipped with a concentrated sulfuric acid flow meter 6 and a concentrated sulfuric acid variable frequency pump 7. The concentrated sulfuric acid flow meter 6 is a Krohne OPTIMASS 7400C Coriolis mass flow meter; the concentrated sulfuric acid variable frequency pump 7 is a Grundfos CRNE series magnetic drive centrifugal pump. The concentrated sulfuric acid flow meter 6 and the concentrated sulfuric acid variable frequency pump 7 are interlocked, and the pump speed is adjusted through flow feedback to ensure a constant amount of concentrated sulfuric acid added and reduce fluctuations.

[0017] The outlet pipe of the blister drying tower 12 is equipped with the online chlorine moisture analyzer 8. The model of the online chlorine moisture analyzer 8 can be Vaisala DRYCAP DMT143 online dew point meter. The online chlorine moisture analyzer 8 monitors the chlorine moisture content after drying and feeds it back to the DCS system. The real-time feedback of moisture content realizes closed-loop control and improves the drying quality.

[0018] All data is integrated and processed through the DCS control system 10. The PLC dynamic algorithm automatically adjusts each actuator to achieve full-process automated control and optimize the addition of concentrated sulfuric acid. Preferably, the DCS control system 10, a Siemens SIMATIC PCS 7 process control system, integrates a controller (PLC function), human-machine interface, network, and engineering software. It is an ideal platform for realizing complex interlocking control and advanced algorithms, and can be used to display real-time parameters, set control thresholds and alarm information, and supports switching between manual and automatic modes.

[0019] In summary, this utility model's automatic concentrated sulfuric acid adjustment system for chlorine drying utilizes real-time data from multiple sensors and dynamic algorithms to precisely match the amount of concentrated sulfuric acid added with the chlorine drying requirements, increasing acid utilization by 15%-20% and maintaining stable chlorine outlet humidity below 50 ppm. It replaces manual operation, reduces human error, lowers the drying effect fluctuation from ±8% to ±2%, reduces downstream pipeline corrosion by 30%, and extends equipment maintenance cycles by 50%. It also reduces concentrated sulfuric acid waste and waste acid treatment costs, improving production efficiency and economic benefits.

Claims

1. An automatic concentrated sulfuric acid regulating system for chlorine drying, characterized in that, It includes a DCS control system and a chlorine flow meter, a packed drying tower level transmitter, a dilute sulfuric acid pneumatic regulating valve, a concentrated sulfuric acid overflow regulating valve, a bubble cap drying tower level transmitter, a concentrated sulfuric acid flow meter, a concentrated sulfuric acid frequency converter pump, an online chlorine moisture analyzer, and a dilute sulfuric acid concentration analyzer, all electrically connected to the DCS control system. The chlorine flow meter is installed on the inlet pipe of the packed drying tower; the level transmitter of the packed drying tower is installed at the bottom of the packed drying tower; the dilute sulfuric acid pneumatic regulating valve is installed on the pipe between the packed drying tower and the dilute sulfuric acid storage tank; the concentrated sulfuric acid overflow regulating valve is installed on the pipe between the packed drying tower and the bubble cap drying tower; the level transmitter of the bubble cap drying tower is installed at the bottom of the bubble cap drying tower; the concentrated sulfuric acid flow meter and the concentrated sulfuric acid frequency converter are installed on the pipe between the bubble cap drying tower and the concentrated sulfuric acid storage tank; the online chlorine moisture analyzer is installed on the outlet pipe of the bubble cap drying tower; and the dilute sulfuric acid concentration analyzer is installed on the outlet pipe of the packed drying tower.

2. The automatic concentrated sulfuric acid regulating system for chlorine drying according to claim 1, characterized in that, The DCS control system also includes a human-machine interface module, which is used to display real-time parameters, set control thresholds and alarm information, and supports switching between manual and automatic modes.

3. The automatic concentrated sulfuric acid adjustment system for chlorine drying according to claim 2, characterized in that, The concentrated sulfuric acid flow meter and the concentrated sulfuric acid frequency converter are interlocked.

4. The automatic concentrated sulfuric acid regulating system for chlorine drying according to claim 3, characterized in that, The dilute sulfuric acid concentration analyzer is interlocked with the dilute sulfuric acid pneumatic regulating valve and the level transmitter of the packed drying tower.

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