Liquid chlorine storage tank leakage one-key remote tank pouring control system and method

Abstract

The invention relates to the technical field of chemical safety automation control, and discloses a liquid chlorine storage tank leakage one-key remote tank pouring control system and method.The liquid chlorine storage tank leakage one-key remote tank pouring control system comprises a liquid inlet pipeline and a liquid outlet pipeline, a plurality of liquid chlorine storage tanks are sequentially arranged below the liquid inlet pipeline in the liquid inlet direction of the liquid inlet pipeline, and each liquid chlorine storage tank is connected with the liquid inlet pipeline through a backflow valve; each liquid chlorine storage tank is connected with a liquid outlet pipeline through a discharge valve; a balance pipeline is arranged on one side of each liquid chlorine storage tank, each liquid chlorine storage tank is connected with the balance pipeline through a balance valve, each liquid chlorine storage tank is provided with a pressure sensor and a liquid level sensor, the left end of the liquid inlet pipeline is communicated with the left end of the liquid outlet pipeline, a submerged pump is arranged at the communication position, and a backflow main valve is arranged at the liquid inlet end of the liquid inlet pipeline. The system further comprises a PLC control system and a control terminal. Full-process automatic operation is triggered through one key, and the liquid chlorine leakage amount and diffusion risk are greatly reduced; and after tank pouring is completed, the system automatically resets standby resources, and safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical safety automation control, and in particular to a one-button remote tank emptying control system and method for a liquid chlorine storage tank leak. Background Art

[0002] Liquid chlorine storage tanks are used to store liquid chlorine and are commonly used in the chemical, pharmaceutical, metallurgical, and water treatment industries. In the chlor-alkali chemical industry, liquid chlorine storage tanks are considered a Class I major hazard source and require emergency disposal in the event of a leak.

[0003] Traditional processes rely on on-site personnel to operate multiple valves and start and stop backup pumps, which has the following defects: First, the operating process is cumbersome: multiple valves such as the balancing valve, discharge valve, and reflux valve need to be operated in sequence, and parameters such as pressure and liquid level need to be manually judged, resulting in a long response time (usually more than 10 minutes). Second, emergency reliability is low: manual operation is prone to misjudgment due to nervousness, and it is impossible to start the tank dumping at the moment of leakage. Third, it is not intelligent enough: there is a lack of automatic backup tank identification and process linkage, which makes it difficult to meet the needs of modern chemical safety for rapid response and precise control. The traditional tank dumping process relies on manual step-by-step operation and cannot achieve "one-button start, fully automatic execution", resulting in delayed leak treatment and the possibility of major safety accidents.

[0004] Therefore, those skilled in the art urgently need to develop a one-button remote tank emptying control system and method for liquid chlorine storage tank leakage. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a one-button remote tank emptying control system and method for liquid chlorine storage tank leakage.

[0006] Based on one purpose of the present invention, the following technical solution is proposed: a one-button remote tank emptying control system for liquid chlorine storage tank leakage, comprising a liquid inlet pipeline and a liquid outlet pipeline, wherein a plurality of liquid chlorine storage tanks are sequentially arranged below the liquid inlet pipeline along the liquid inlet direction thereof, each liquid chlorine storage tank is connected to the liquid inlet pipeline via a reflux valve, and each liquid chlorine storage tank is connected to the liquid outlet pipeline via a discharge valve; A balancing pipeline is provided on one side of the multiple liquid chlorine storage tanks. Each liquid chlorine storage tank is connected to the balancing pipeline through a balancing valve. Each liquid chlorine storage tank is provided with a pressure sensor and a liquid level sensor. The left ends of the liquid inlet pipeline and the liquid outlet pipeline are connected and a submersible pump is provided at the connection point. A reflux main valve is provided at the liquid inlet end of the liquid inlet pipeline.

[0007] Preferably, there are multiple submersible pumps, and the multiple submersible pumps are connected in parallel between the liquid inlet pipeline and the liquid outlet pipeline.

[0008] Preferably, it also includes a PLC control system, which is connected to each valve, pump group and sensor group. The valve includes a reflux main valve, a reflux valve, a discharge valve and a balancing valve. The pump group includes multiple submersible pumps. The sensor group includes a pressure sensor and a liquid level sensor.

[0009] Preferably, a control terminal is further included, and the control terminal includes a process progress monitoring module, and the process progress monitoring module monitors the pressure and liquid level in real time through a status indicator light and a signal indicator light.

[0010] Based on another object of the present invention, a one-button remote tank emptying control method for liquid chlorine storage tank leakage is proposed, comprising the following steps: S1. One-button start: During the storage process, one or more of the liquid chlorine storage tanks are used as tanks, and one or more of the remaining liquid chlorine storage tanks are used as spare tanks. When a leak is detected in one or more of the used tanks, a tank emptying instruction is sent; S2. Spare slot identification: The PLC control system receives the instruction and scans the spare slots in real time, detects them, and selects one or several spare slots for refilling; S3. Establishing pressure balance: Open the balancing valve of the selected standby tank and test the tank pressure. When the pressure is ≥ 0.09 MPa, proceed to the next step of liquid chlorine delivery. S4, liquid chlorine delivery: After opening the discharge valve of the leakage tank, open the reflux valve and the main reflux valve of the selected standby tank, start one of the submersible pumps, establish the liquid chlorine delivery circuit, and start tank emptying; S5. Tank emptying is completed: the liquid level of the leakage tank is monitored in real time. When the liquid level drops to the low liquid level threshold, the tank emptying is determined to be completed, and the corresponding discharge valve, submersible pump, reflux valve and balance valve are closed in sequence. The low liquid level threshold is ≤2%.

[0011] Preferably, in step S5, when the slot reversal is completed, the leaking slot is marked as a "spare slot" and the selected spare slot is marked as a "slot in use".

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. Emergency response time is sharply reduced from more than 10 minutes in traditional processes to 2-3 minutes. One-click triggering of full-process automated operation can start "spare tank identification → valve linkage → pump group start and stop → state switching" within 30 seconds, greatly reducing the amount of liquid chlorine leakage and the risk of diffusion.

[0013] 2. The entire process is remotely controlled and automated, eliminating the need for personnel to enter dangerous areas, thus avoiding secondary accidents such as poisoning and frostbite. Closed-loop control based on real-time data on pressure and liquid level replaces manual judgment and eliminates operational errors. After tank emptying is completed, the system automatically resets the backup resources to ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the topology diagram of the one-key tank emptying system for liquid chlorine storage tanks; Figure 2 This is the logic block diagram of the trough reversal process. DETAILED DESCRIPTION

[0015] The present invention is described below in conjunction with the accompanying drawings and specific embodiments of the present invention. The description herein is only used to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work based on all other embodiments obtained in the present invention should be included in the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0018] Example 1 See also Figure 1 The present invention provides a one-button remote tank reversing control system for liquid chlorine storage tank leakage, comprising a liquid inlet pipeline 100 and a liquid outlet pipeline 200. Along the liquid inlet direction of the liquid inlet pipeline 100, a plurality of liquid chlorine storage tanks are sequentially arranged below it, each liquid chlorine storage tank is connected to the liquid inlet pipeline 100 through a reflux valve, and each liquid chlorine storage tank is connected to the liquid outlet pipeline 200 through a discharge valve; A balancing pipeline 300 is provided on one side of the multiple liquid chlorine storage tanks. Each liquid chlorine storage tank is connected to the balancing pipeline 300 through a balancing valve. Each liquid chlorine storage tank is provided with a pressure sensor and a liquid level sensor. The left ends of the liquid inlet pipeline 100 and the liquid outlet pipeline 200 are connected and a submersible pump is provided at the connection point. A reflux main valve is provided at the liquid inlet end of the liquid inlet pipeline 100.

[0019] Valve group: Each storage tank balancing valve (HV-5501 series), discharge valve (HV-5503 series), reflux valve (HV-5507 series), and reflux main valve (HIC-5506) are equipped with electric actuators.

[0020] Sensor group: pressure sensor (PIA-5504 series) and liquid level sensor (LIA-5503 series) to collect tank pressure and liquid level data in real time.

[0021] Furthermore, there are multiple submersible pumps, and the multiple submersible pumps are connected in parallel between the liquid inlet pipeline 100 and the liquid outlet pipeline 200 .

[0022] Submersible pump group: Submersible pump A (HSP604A) and submersible pump B (HSP604B), support remote start and stop control.

[0023] Furthermore, it also includes a PLC control system, which is connected to various valves, pump groups and sensor groups. The valves include a reflux main valve, a reflux valve, a discharge valve and a balancing valve. The pump group includes multiple submersible pumps. The sensor group includes a pressure sensor and a liquid level sensor.

[0024] The PLC control system includes a PLC controller, AI, AO, DI, and DO modules, relays, and a 24V power module. The 24V power module provides power to the PLC control system module. The AI ​​module collects tank level and pressure signals, analyzes the collected data through a program, and issues a command when the program action conditions are met. The AO and DO output modules control the operation of the regulating valve and shut-off valve. After the valve actuation, feedback is provided to the controller via the DI module. After receiving the feedback signal, the controller proceeds to the next action according to the program until the program runs to the end.

[0025] Furthermore, it also includes a control terminal, which includes a process progress monitoring module. The process progress monitoring module monitors the pressure and liquid level in real time through status indicators and signal indicators.

[0026] The control terminal includes a spare tank status indicator light, a process progress monitoring module, a valve and pump feedback signal indicator light, a pressure signal display, and a real-time liquid level monitoring system. Each signal is equipped with an abnormal alarm flashing and sound prompt function.

[0027] The PLC control system has a built-in one-button tank reversal logic program, which communicates with the control terminal, valves, pump groups, and sensors via the MODBUS protocol to achieve automatic process execution and status feedback. The control terminal is a one-button tank reversal operation interface set up in the central control room, which includes leakage tank selection buttons (such as SEL_A, SEL_B, etc.), tank status indicators, and a process progress monitoring module. Different color indicators are displayed according to the occupancy of the tank. At the same time, the PLC controller transmits the status of each valve, pump group, and sensor group to the display in real time to monitor the process progress.

[0028] Example 2 See also Figure 2 The present invention also provides a one-key remote tank emptying control method for a liquid chlorine storage tank leak, comprising the one-key remote tank emptying control system for a liquid chlorine storage tank leak in the above embodiment, further comprising the following steps: S1. One-button start: During the storage process, one or more of the liquid chlorine storage tanks are used as tanks, and one or more of the remaining liquid chlorine storage tanks are used as spare tanks. When a leak is detected in one or more of the used tanks, a tank emptying instruction is sent; S2. Spare slot identification: The PLC control system receives the instruction and scans the spare slots in real time, detects them, and selects one or several spare slots for refilling; S3. Establishing pressure balance: Open the balancing valve of the selected standby tank and test the tank pressure. When the pressure is ≥ 0.09 MPa, proceed to the next step of liquid chlorine delivery. S4, liquid chlorine delivery: After opening the discharge valve of the leakage tank, open the reflux valve and the main reflux valve of the selected standby tank, start one of the submersible pumps, establish the liquid chlorine delivery circuit, and start tank emptying; S5. Tank emptying is completed: the liquid level of the leakage tank is monitored in real time. When the liquid level drops to the low liquid level threshold, the tank emptying is determined to be completed, and the corresponding discharge valve, submersible pump, reflux valve and balance valve are closed in sequence. The low liquid level threshold is ≤2%.

[0029] Furthermore, in step S5, when the slot reversal is completed, the leaking slot is marked as a "spare slot" and the selected spare slot is marked as an "in-use slot".

[0030] Core control logic (taking slot 1 leaking and transferring to spare slot 3 as an example) 1. One-key start: 1) When the operator finds that slot 1 is leaking, he clicks the "SEL_A" button on the control terminal to send a slot reversal instruction (the SEL_A value is set to "ON").

[0031] 2. Spare slot identification: 1) The PLC program scans the status of the spare slot in real time. When it detects that the signal of slot 3 "BY550_3" is "ON" (that is, marked as the spare slot), the slot reversal process is triggered.

[0032] 3. Pressure balance establishment: 1) Automatically open the balancing valve HV-5501C of the No. 3 standby tank to connect the gas phase pipeline; 2) Monitor the pressure of tank 3 using PIA-5504C. When the pressure rises to ≥0.09 MPa (balanced with the pressure in the leakage tank), proceed to the next step.

[0033] 4. Liquid chlorine transportation: 1) Open the discharge valve HV-5503A of tank 1, and after the valve feedback "open position" signal, open the reflux valve HV-5507C and the reflux main valve HIC-5506 of tank 3; 2) Automatically start submersible pump A HSP604A or submersible pump B HSP604B according to preset priority (or manual selection) to establish a liquid chlorine delivery circuit.

[0034] 5. Determination of completion of troughing: 1) Monitor the liquid level of tank 1 in real time using LIA-5503A. When the liquid level drops to ≤2% (low liquid level threshold), tank emptying is considered complete.

[0035] 6. Process termination and state switching: 1) Close the discharge valve HV-5503A of tank 1, the submersible pump, the reflux valve HV-5507C of tank 3, the balancing valve HV-5501A of tank 1, and the main reflux valve HIC-5506 in sequence; 2) Reset the SEL_A button to "OFF". The system automatically marks slot 3 as "in use" and slot 1 as "spare slot". The process ends.

[0036] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. One-button remote tank emptying control system for liquid chlorine storage tank leakage, characterized by: It comprises a liquid inlet pipeline (100) and a liquid outlet pipeline (200), and a plurality of liquid chlorine storage tanks are sequentially arranged below the liquid inlet pipeline (100) along the liquid inlet direction thereof, each liquid chlorine storage tank is connected to the liquid inlet pipeline (100) via a reflux valve, and each liquid chlorine storage tank is connected to the liquid outlet pipeline (200) via a discharge valve; A balancing pipeline (300) is provided on one side of the plurality of liquid chlorine storage tanks, each of which is connected to the balancing pipeline (300) via a balancing valve, and each of which is provided with a pressure sensor and a liquid level sensor. The left ends of the liquid inlet pipeline (100) and the liquid outlet pipeline (200) are connected, and a submersible pump is provided at the connection point. A main reflux valve is provided at the liquid inlet end of the liquid inlet pipeline (100).

2. The one-button remote tank emptying control system for liquid chlorine storage tank leakage according to claim 1 is characterized in that: There are multiple submersible pumps, and the multiple submersible pumps are connected in parallel between the liquid inlet pipeline (100) and the liquid outlet pipeline (200).

3. The one-button remote tank emptying control system for liquid chlorine storage tank leakage according to claim 2, characterized in that: It also includes a PLC control system, which is connected to various valves, pump groups and sensor groups. The valves include a reflux main valve, a reflux valve, a discharge valve and a balancing valve. The pump group includes multiple submersible pumps. The sensor group includes a pressure sensor and a liquid level sensor.

4. The one-button remote tank emptying control system for liquid chlorine storage tank leakage according to claim 3 is characterized in that: It also includes a control terminal, which includes a process progress monitoring module. The process progress monitoring module monitors the pressure and liquid level in real time through a status indicator light and a signal indicator light.

5. A one-button remote tank emptying control method for liquid chlorine storage tank leakage, characterized by: The method uses the one-button remote tank emptying control system for liquid chlorine storage tank leakage according to any one of claims 1 to 4, comprising the following steps: S1. One-button start: During the storage process, one or more of the liquid chlorine storage tanks are used as tanks, and one or more of the remaining liquid chlorine storage tanks are used as spare tanks. When a leak is detected in one or more of the used tanks, a tank emptying instruction is sent; S2. Spare slot identification: The PLC control system receives the instruction and scans the spare slots in real time, detects them, and selects one or several spare slots for refilling; S3. Establishing pressure balance: Open the balancing valve of the selected standby tank and test the tank pressure. When the pressure is ≥ 0.09 MPa, proceed to the next step of liquid chlorine delivery. S4, liquid chlorine delivery: After opening the discharge valve of the leakage tank, open the reflux valve and the main reflux valve of the selected standby tank, start one of the submersible pumps, establish the liquid chlorine delivery circuit, and start tank emptying; S5. Tank emptying is completed: the liquid level of the leakage tank is monitored in real time. When the liquid level drops to the low liquid level threshold, the tank emptying is determined to be completed, and the corresponding discharge valve, submersible pump, reflux valve and balance valve are closed in sequence. The low liquid level threshold is ≤2%.

6. The one-button remote tank emptying control method for liquid chlorine storage tank leakage according to claim 5, characterized in that: In step S5, when the slot reversal is completed, the leaking slot is marked as a "spare slot" and the selected spare slot is marked as an "in-use slot".

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