A hydrogen fluoride storage tank leakage detection and emergency spraying integrated system

Abstract

The utility model provides a kind of hydrogen fluoride storage tank leak detection and emergency sprinkling integrated system, including corrosion-resistant electrochemical sensor array, is arranged on the outer wall of hydrogen fluoride storage tank;Signal processing unit is electrically connected with the corrosion-resistant electrochemical sensor array;Alarm and positioning unit is signal connected with the signal processing unit;Emergency sprinkling system is linked with the signal processing unit, including ring storage tank four around spraying assembly and storage tank roof spraying assembly, the ring storage tank four around spraying assembly is connected water storage tank with storage tank roof spraying assembly by connecting main pipe, high-pressure water pump is installed on the connecting main pipe.The utility model realizes the accurate discovery and positioning to hydrogen fluoride early leakage, and can automatically link stereoscopic sprinkling system in detection instant, quickly absorbs leakage, to effectively solve the problem of traditional detection lag and disposal not in time.

Description

Technical Field

[0001] This utility model relates to the field of safety monitoring and emergency response of chemical equipment, specifically to an integrated system for detecting leaks in hydrogen fluoride storage tanks and providing emergency spraying. Background Technology

[0002] Hydrogen fluoride (HF) is a highly corrosive and toxic chemical. During its storage, the risk of leakage from storage tanks due to corrosion, weld cracking, or seal failure always exists. Once a leak occurs, it will not only severely corrode production equipment but also pose a fatal threat to the lives of personnel on site and cause irreparable environmental pollution.

[0003] Hydrogen fluoride, once leaked, rapidly vaporizes from its liquid state. Because hydrogen fluoride gas is slightly less dense than air, it diffuses upwards and outwards after forming a gaseous state. This characteristic inherently flaws traditional detection systems based on gas diffusion detection. Gas detectors installed around the storage tank must wait for the leaked gas to diffuse and reach a certain concentration before triggering an alarm, resulting in a significant response lag. Furthermore, most existing safety measures separate detection from response, relying on manual judgment and remote activation of spray systems after an alarm, failing to achieve automatic and synchronized emergency response in the initial stages of a leak. It is precisely this window of opportunity between "detection lag" and "response delay" that allows a leak that could have been contained locally to escalate into a widespread and serious accident.

[0004] Therefore, there is an urgent need for an active prevention and control system for hydrogen fluoride storage tank leaks that integrates "early and accurate detection" and "instant spraying treatment" to truly achieve a seamless closed loop from risk discovery to risk prevention. Utility Model Content

[0005] The purpose of this invention is to provide an integrated system for detecting and responding to leaks in hydrogen fluoride storage tanks, in order to solve the technical problems existing in the prior art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an integrated system for detecting and providing emergency spraying of hydrogen fluoride storage tank leaks, comprising: A corrosion-resistant electrochemical sensor array is deployed on the outer wall of a hydrogen fluoride storage tank; The signal processing unit is electrically connected to the corrosion-resistant electrochemical sensor array; An alarm and positioning unit is connected to the signal processing unit via a signal connection. The emergency sprinkler system, which is linked to the signal processing unit, includes a sprinkler assembly around the storage tank and a sprinkler assembly on the top of the storage tank. The sprinkler assembly around the storage tank and the sprinkler assembly on the top of the storage tank are connected to the water storage tank through a connecting main pipe, on which a high-pressure water pump is installed.

[0007] Furthermore, the corrosion-resistant electrochemical sensor array consists of multiple PTEE-encapsulated electrochemical HF sensors. These multiple PTEE-encapsulated electrochemical HF sensors are uniformly attached to the longitudinal and circumferential directions of the outer wall of the hydrogen fluoride storage tank, covering the weld seam and valve interface area. There is a gap between adjacent PTEE-encapsulated electrochemical HF sensors.

[0008] Furthermore, the signal processing unit includes a PLC controller and a relay, the relay being linked with the emergency sprinkler system.

[0009] Furthermore, the alarm and positioning unit includes an on-site audible and visual alarm and an operating room touchscreen, on which a distribution map of the corrosion-resistant electrochemical sensor array is displayed.

[0010] Furthermore, the surrounding spray assembly of the annular storage tank includes an annular tank spray pipe arranged circumferentially around the annular hydrogen fluoride storage tank and multiple water curtain nozzles. The multiple water curtain nozzles are evenly distributed along the extension direction of the annular tank spray pipe, and each water curtain nozzle is set towards the hydrogen fluoride storage tank.

[0011] Furthermore, the spray assembly around the annular storage tank is located in the middle of the hydrogen fluoride storage tank, and its spray range covers the lower to middle area of ​​the hydrogen fluoride storage tank.

[0012] Furthermore, the tank top spray assembly includes a tank top spray pipe arranged above the central axis of the tank top of the hydrogen fluoride storage tank, and a plurality of wide-angle nozzles evenly spaced on the tank top spray pipe.

[0013] Furthermore, the high-pressure water pump is a corrosion-resistant centrifugal pump.

[0014] Furthermore, the water storage tank is a polyethylene tank.

[0015] Compared with existing technologies, the above technical solution has the following advantages: by directly deploying the corrosion-resistant electrochemical sensor array on the outer wall of the storage tank, the system can accurately detect and locate early and trace leaks of hydrogen fluoride; at the same time, through integrated linkage control, the system can automatically start a three-dimensional spray to quickly absorb the leaked material the moment a leak is detected, thereby effectively solving the core problems of lagging detection and untimely emergency response in traditional methods, and forming a rapid closed loop from risk discovery to containment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a system structure block diagram of this utility model; Figure 2 This is a layout diagram of the emergency sprinkler system 5 in this utility model; Figure 3 This is a front view of the hydrogen fluoride storage tank 1 in this utility model with the corrosion-resistant electrochemical sensor array 2 arranged thereon; Figure 4 This is a top view of the hydrogen fluoride storage tank 1 in this utility model with the corrosion-resistant electrochemical sensor array 2 arranged thereon; Figure 5 This is a schematic diagram of the working process of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Hydrogen fluoride storage tank; 2. Corrosion-resistant electrochemical sensor array; 21. Electrochemical HF sensor encapsulated in a PTEE shell; 3. Signal processing unit; 31. PLC controller; 32. Relay; 4. Alarm and positioning unit; 41. On-site audible and visual alarm; 42. Control room touch screen; 5. Emergency sprinkler system; 51. Sprinkler assembly around the storage tank; 511. Sprinkler pipe around the tank; 512. Water curtain nozzle; 52. Sprinkler assembly on the top of the storage tank; 521. Sprinkler pipe on the top of the tank; 522. Wide-angle nozzle; 53. Connecting main pipe; 531. High-pressure water pump; 54. Water storage tank. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0020] To address the problems existing in the prior art, this utility model provides an integrated system for detecting and emergency spraying leaks in hydrogen fluoride storage tanks. The following is a detailed description of this utility model with reference to the accompanying drawings.

[0021] See Figures 1-4 As shown, the technical solution adopted in this specific embodiment is: an integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank 1, which mainly includes a corrosion-resistant electrochemical sensor array 2, a signal processing unit 3, an alarm and positioning unit 4, and an emergency spraying system 5.

[0022] A corrosion-resistant electrochemical sensor array 2 is deployed on the outer wall of the hydrogen fluoride storage tank 1. Specifically, the array consists of multiple independent electrochemical HF sensors 21 encapsulated in PTEE shells. Each PTEE-encapsulated electrochemical HF sensor 21 is encapsulated in a polytetrafluoroethylene (PTEE) shell and contains a three-electrode system, exhibiting high selectivity for hydrogen fluoride (HF) gas with a detection limit ≤0.1 ppm and a response time ≤30 seconds. These independent PTEE-encapsulated electrochemical HF sensors 21 are tightly fitted to the outer wall surface of the hydrogen fluoride storage tank 1 and are uniformly distributed in a matrix along the longitudinal and circumferential directions of the tank. In particular, adjacent PTEE-encapsulated electrochemical HF sensors 21 are spaced at a predetermined distance, preferably 10 cm, to detect hydrogen fluoride present in liquid, semi-volatile, or locally high-concentration gaseous forms during the initial stage of leakage.

[0023] It should be emphasized that the PTEE-encased electrochemical HF sensor 21 should focus on covering known areas with leakage risks, such as weld seams and valve interfaces.

[0024] The signal processing unit 3 establishes an electrical connection with the corrosion-resistant electrochemical sensor array 2 through a shielded cable. It is mainly used to receive and process the electrical signals transmitted from the corrosion-resistant electrochemical sensor array 2 and to determine whether there is a leak based on the changes in the electrical signals. It also has a linkage control function with the emergency sprinkler system 5 and can send a start command after a leak is detected.

[0025] Specifically, the core of the signal processing unit 3 is a PLC controller 31 (Programmable Logic Controller). The PLC controller 31 has a preset leakage detection threshold and is used to continuously receive and process the current / voltage signals from the corrosion-resistant electrochemical sensor array 2 in real time. After analysis, it outputs a "normal / leakage" judgment result. When the signal value of any PTEE-encased electrochemical HF sensor 21 exceeds the preset threshold, the PLC controller 31 determines that a "leakage" has occurred. The signal processing unit 3 also integrates a relay 32. The control terminal of the relay 32 is connected to the output terminal of the PLC controller 31, and the controlled terminal is linked to the power source of the emergency sprinkler system 5 (i.e., the high-pressure water pump 531). Accordingly, when the signal processing unit 3 determines a leak, it can quickly trigger the sprinkler system.

[0026] The alarm and location unit 4 is connected to the signal processing unit 3. The alarm and location unit 4 includes a local audible and visual alarm 41 and an operator's touchscreen 42. When the signal processing unit 3 determines that a leak has occurred, the local audible and visual alarm 41 is immediately triggered, emitting a strong audiovisual warning signal. Simultaneously, the operator's touchscreen 42 displays a distribution map based on a corrosion-resistant electrochemical sensor array, highlighting the location of the PTEE-encased electrochemical HF sensor 21, which detected an abnormal signal, with a flashing red marker. The specific location information and leak level of the leak point are also displayed in text or coordinate form.

[0027] The emergency sprinkler system 5 is linked with the signal processing unit 3 via the aforementioned relay 32. The emergency sprinkler system 5 adopts a dual-zone three-dimensional coverage design, specifically including a sprinkler assembly 51 around the perimeter of the storage tank and a sprinkler assembly 52 on the top of the storage tank.

[0028] Specifically, the surrounding spray assembly 51 is positioned in the middle of the hydrogen fluoride storage tank 1, ensuring that the spray area covers the lower to middle portion of the hydrogen fluoride storage tank 1. The surrounding spray assembly 51 includes a ring-shaped spray pipe 511 arranged circumferentially around the hydrogen fluoride storage tank 1 and multiple water curtain nozzles 512. The ring-shaped spray pipe 511 is preferably made of 304 stainless steel, and multiple water curtain nozzles 512 are evenly installed on the pipe at 0.05m intervals. All water curtain nozzles 512 spray towards the outer wall of the hydrogen fluoride storage tank 1, and their combined action forms a continuous water curtain from the lower to the middle portion of the hydrogen fluoride storage tank 1, used to capture and absorb liquid hydrogen fluoride flowing down the tank wall of the hydrogen fluoride storage tank 1, as well as gaseous hydrogen fluoride diffusing in this area.

[0029] The tank top spray assembly 52 includes a tank top spray pipe 521 horizontally arranged about 1.5m above the central axis of the tank top of the hydrogen fluoride storage tank 1. This tank top spray pipe 521 is preferably made of stainless steel. Multiple wide-angle nozzles 522 are installed on the tank top spray pipe 521 at 1.0m intervals. The spray angle of each wide-angle nozzle 522 is configured to be 150 degrees, effectively covering the entire tank top and the space within 1.5m above the hydrogen fluoride storage tank 1, to intercept gaseous hydrogen fluoride that diffuses upwards due to its slightly lower density than air.

[0030] It should be specifically noted that the surrounding spray assembly 51 and the top spray assembly 52 of the storage tank are connected to an independent water storage tank 54 via a connecting main pipe 53. A high-pressure water pump 531 is installed on this connecting main pipe 53. This high-pressure water pump 531 is preferably a corrosion-resistant centrifugal pump to ensure long-term stable operation and provide the pressure required for spraying. The water storage tank 54 is preferably made of polyethylene, which has good corrosion resistance. Spraying wastewater is discharged into the plant's wastewater treatment station through a dedicated pipeline for centralized treatment. After treatment to meet standards, it is discharged, thereby avoiding secondary pollution to the environment.

[0031] The workflow of this system can be found by referring to... Figure 5 As shown, the specific process is as follows: System startup and initialization: Turn on the signal processing unit 3 to perform real-time zero-point calibration on the corrosion-resistant electrochemical sensor array 2 to ensure that the signals of all PTEE-encased electrochemical HF sensors 21 are in a stable state; check the water level of the water storage tank 54 in the emergency sprinkler system 5 and the operation of the high-pressure water pump 531 to ensure that the system is in standby mode. Leakage monitoring and identification: The corrosion-resistant electrochemical sensor array 2 continuously collects electrical signals from the tank wall. When a small leak occurs at the weld of the hydrogen fluoride storage tank 1, liquid hydrogen fluoride seeps out and adheres to the tank wall, coming into contact with the nearby PTEE-encased electrochemical HF sensor 21, causing a change in the sensor's electrical signal. After receiving the signal, the signal processing unit 3 compares it with a preset threshold and determines that "leakage has occurred". Integrated linkage response: The alarm and positioning unit 4 quickly activates the on-site audible and visual alarm 41, and the touch screen 42 in the control room displays "a leak has occurred at a specific location in the storage tank"; the signal processing unit 3 simultaneously sends a start command to the high-pressure water pump 531, and the high-pressure water pump 531 starts within 2 seconds. The water curtain nozzles 512 of the ring tank spray pipe 511 and the wide-angle nozzles 522 of the tank top spray pipe 521 spray synchronously to form a water curtain covering the outer wall and top space of the hydrogen fluoride storage tank 1. The leaked hydrogen fluoride gas comes into contact with water to generate a fluorinated acid aqueous solution, which is captured by the water curtain; Leak sealing and system reset: On-site personnel wear protective suits and gas masks, and use sealing tools to seal the leak point according to the location of the leak point displayed on the touch screen in the control room; after sealing is completed, the sensor electrical signal is reset, and after the signal processing unit 3 continuously monitors for 5 minutes without any abnormalities, the high-pressure water pump 531 is automatically shut down, and the emergency sprinkler system 5 stops working; the sprinkler wastewater is discharged into the plant wastewater treatment station through a dedicated pipeline, and is discharged after treatment to meet the standards.

[0032] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0033] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An integrated system for leak detection and emergency spraying of a hydrogen fluoride storage tank (1), characterized in that, include: A corrosion-resistant electrochemical sensor array (2) is installed on the outer wall of a hydrogen fluoride storage tank (1); The signal processing unit (3) is electrically connected to the corrosion-resistant electrochemical sensor array (2); The alarm and positioning unit (4) is connected to the signal processing unit (3) via a signal connection. The emergency sprinkler system (5) is linked with the signal processing unit (3) and includes a sprinkler assembly (51) around the storage tank and a sprinkler assembly (52) on the top of the storage tank. The sprinkler assembly (51) around the storage tank and the sprinkler assembly (52) on the top of the storage tank are connected to the water tank (54) through a connecting main pipe (53). A high-pressure water pump (531) is installed on the connecting main pipe (53).

2. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The corrosion-resistant electrochemical sensor array consists of multiple PTEE-encapsulated electrochemical HF sensors (21). The multiple PTEE-encapsulated electrochemical HF sensors (21) are uniformly attached to the longitudinal and circumferential directions of the outer wall of the hydrogen fluoride storage tank (1) and cover the weld seam and valve interface area. There is a gap between adjacent PTEE-encapsulated electrochemical HF sensors (21).

3. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The signal processing unit (3) includes a PLC controller (31) and a relay (32), which is linked with the emergency sprinkler system (5).

4. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The alarm and positioning unit (4) includes an on-site audible and visual alarm (41) and an operating room touch screen (42), on which a distribution map of the corrosion-resistant electrochemical sensor array (2) is displayed.

5. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The surrounding spray assembly (51) of the annular storage tank includes an annular tank spray pipe (511) arranged circumferentially around the annular hydrogen fluoride storage tank (1) and multiple water curtain nozzles (512). The multiple water curtain nozzles (512) are evenly distributed along the extension direction of the annular tank spray pipe (511), and each water curtain nozzle (512) is set towards the hydrogen fluoride storage tank (1).

6. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 5, characterized in that, The surrounding spray assembly (51) of the annular storage tank is located in the middle of the hydrogen fluoride storage tank (1), and its spray range covers the lower to middle area of ​​the hydrogen fluoride storage tank (1).

7. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The tank top spray assembly (52) includes a tank top spray pipe (521) arranged above the central axis of the tank top of the hydrogen fluoride storage tank (1), and a plurality of wide-angle nozzles (522) evenly spaced on the tank top spray pipe (521).

8. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The high-pressure water pump (531) is a corrosion-resistant centrifugal pump.

9. The integrated system for leak detection and emergency spraying of hydrogen fluoride storage tank (1) according to claim 1, characterized in that, The water storage tank (54) is a polyethylene tank.

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