A liquefied petroleum gas filling carousel dangerous gas leakage monitoring and anti-leakage system

Abstract

The utility model provides a kind of liquefied petroleum gas filling carousel dangerous gas leakage monitoring and anti-leakage system, including filling device, it is characterized by: the filling device is equipped with combustible gas detector around, the liquid pipe conveying main pipeline of the filling device is equipped with stop valve, the combustible gas detector is accessed controller, the controller is connected with the stop valve. A kind of liquefied petroleum gas filling carousel dangerous gas leakage monitoring and anti-leakage system disclosed in the utility model, configure stop valve on filling carousel liquid pipe conveying main pipeline, directly link up and close by controller, can cut off liquid supply in early abnormal period, inhibit combustible gas to continue to accumulate, significantly reduce explosion probability and accident scale.

Description

Technical Field

[0001] This utility model belongs to the field of control systems, and in particular relates to a hazardous gas leakage monitoring and prevention system for a liquefied petroleum gas filling turntable. Background Technology

[0002] On a liquefied petroleum gas (LPG) cylinder filling production line, empty cylinders are typically conveyed by a feeding conveyor belt to a multi-station filling turntable. After quantitative filling, they are then conveyed by a discharge conveyor belt to subsequent processes. Due to LPG's characteristics of low explosiveness, high density, and tendency to accumulate at low altitudes, two types of leakage are unavoidable during the filling process: one is the trace "normal leakage" that occurs during filling connections and valve switching, which is low in concentration and short in duration; the other is the "abnormal leakage" caused by hose damage, seal failure, or valve malfunction, which, if the concentration rises to the flammable and explosive range, can easily lead to personal injury and equipment damage. Utility Model Content

[0003] In view of this, the present invention aims to provide a hazardous gas leakage monitoring and prevention system for liquefied petroleum gas filling turntables, so as to at least solve one of the problems in the background art.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A hazardous gas leakage monitoring and prevention system for a liquefied petroleum gas filling rotary table includes a filling device, a combustible gas detector installed around the filling device, a shut-off valve installed on the main liquid delivery pipeline of the filling device, the combustible gas detector connected to a controller safety control cabinet, and the controller connected to the shut-off valve, wherein the controller is located in the safety control cabinet. The safety control cabinet is equipped with a controller. The input interface of the controller is connected to the alarm signal output terminal of the combustible gas detector, and the output interface of the controller is connected to the control terminal of the shut-off valve.

[0005] Furthermore, the filling device includes a filling turntable.

[0006] Furthermore, the combustible gas detector is connected to the safety control cabinet via a signal line, and the safety control cabinet is connected to the shut-off valve via a control line; Furthermore, the controller is configured to issue an alert signal when the gas concentration detected by the combustible gas detector reaches a preset first threshold.

[0007] Furthermore, the first threshold is set to be between a%LEL and b%LEL of liquefied petroleum gas, where LEL is the lower explosive limit.

[0008] Furthermore, the controller is configured to issue an alarm signal and control the shut-off valve to close when the gas concentration detected by the combustible gas detector reaches a preset second threshold.

[0009] Furthermore, the second threshold is set to be greater than c%LEL of liquefied petroleum gas.

[0010] Furthermore, the shut-off valve includes an automatic shut-off valve or a manual shut-off valve.

[0011] Furthermore, the automatic shut-off valve includes a pneumatic shut-off valve or an electric shut-off valve, which is installed on the main liquid delivery pipeline to realize the opening and closing of the liquid source.

[0012] Furthermore, an actuation structure is provided on the side of the manual shut-off valve, which allows the manual shut-off valve to be opened and / or closed manually or by means of the actuation structure.

[0013] Compared with existing technologies, the liquefied petroleum gas filling turntable hazardous gas leakage monitoring and prevention system of this utility model has the following advantages: (1) The liquefied petroleum gas filling turntable dangerous gas leakage monitoring and leakage prevention system described in this utility model is equipped with a shut-off valve on the main liquid pipeline of the filling turntable, which is directly linked to the controller to close. It can cut off the liquid supply in the early stage of an abnormality, suppress the continued accumulation of combustible gas, and significantly reduce the probability of explosion and the scale of the accident. (2) The liquefied petroleum gas filling turntable dangerous gas leakage monitoring and leakage prevention system described in this utility model uses a dual threshold strategy of a first threshold and a second threshold to only issue a warning signal for normal trace emissions, avoiding unnecessary shutdowns; when the concentration enters the dangerous range, an alarm is immediately triggered and a disposal-level linkage is executed, taking into account both production continuity and inherent safety. (3) The liquefied petroleum gas filling turntable dangerous gas leakage monitoring and leakage prevention system of this utility model, when the disposal level threshold is reached, in addition to shutting off the main pipeline liquid supply, simultaneously controls the feeding conveyor belt to stop running, reducing the number of new steel cylinders entering the dangerous area and reducing the possibility of sparks generated by collision of metal components. Attached Figure Description

[0014] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the structural layout of a hazardous gas leakage monitoring and prevention system for a liquefied petroleum gas filling turntable, as described in an embodiment of this utility model. Figure 2 This is a schematic diagram of the main pipeline and shut-off valve according to an embodiment of the present utility model.

[0015] Explanation of reference numerals in the attached figures: 1-Filling turntable; 2-Control cabinet; 3-Combustible gas detector; 4-Feeding conveyor belt; 5-Discharging conveyor belt; 6-Stop valve; 7-Main pipeline. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] like Figure 1As shown, the liquefied petroleum gas (LPG) filling turntable hazardous gas leakage monitoring and prevention system of this embodiment includes: a combustible gas detector 3 arranged around the filling device, a shut-off valve 6 installed on the liquid delivery main pipeline 7 of the filling device, and a controller electrically connected to both (located in the safety control cabinet 2). The background and scenario of this solution are as follows: the filling device is used to fill LPG and other gases into cylinders; the filling device typically includes a liquid delivery main pipeline 7, one end of which is connected to an external liquid source (in this solution, the liquid source can represent the filling material), and the other end is connected to a filling pipeline to fill the cylinders; and multiple filling pipelines can be branched from the liquid delivery main pipeline 7 according to actual needs to fill multiple cylinders simultaneously. In actual use, a filling turntable 1 (such as...) is typically used. Figure 1 The diagram shows a top view of the filling turntable 1. Multiple sets of electronic filling scales are usually installed on the filling turntable 1. The main liquid delivery pipeline 7 is connected to the electronic filling scales through branch filling pipelines. The electronic filling scales are used to fill and weigh the cylinders.

[0021] This solution involves installing combustible gas detectors 3 around the existing filling equipment to detect gas leaks; a shut-off valve 6 is installed on the main liquid delivery pipeline 7; the input terminal of the controller built into the safety control cabinet 2 is connected to the combustible gas detector 3, and the output terminal is connected to the shut-off valve 6. The combustible gas detector 3 sends a detection signal to the controller, which controls the opening and closing of the shut-off valve 6 to control the flow of the main liquid delivery pipeline 7. The type of combustible gas detector 3 is not limited; electrochemical or infrared principle products can be selected based on site conditions. Its installation position should be close to and appropriate to potential leak sources at the filling position (its installation position depends on the specific gas being detected; for example, LPG detection should be close to potential leak sources at the filling position and positioned appropriately at a lower level) to improve the response capability to LPG accumulation.

[0022] The shut-off valve 6 includes either an automatic shut-off valve or a manual shut-off valve. The automatic shut-off valve includes either a pneumatic shut-off valve or an electric shut-off valve, which is installed on the main liquid delivery pipeline 7 to control the flow of liquid. The manual shut-off valve can be opened and closed manually, or an actuator can be installed on its side as needed (the actuator can be an existing product, such as a pre-configured and adjusted robotic arm or manipulator; the control method of the robotic arm or manipulator can be achieved using existing technology, which will not be elaborated in this solution), so that the manual shut-off valve can be opened and / or closed manually or by the actuator. In this solution, the shut-off valve 6 is preferably a pneumatically normally closed shut-off valve, and it is installed on the main liquid delivery pipeline 7 of the filling turntable 1.

[0023] The specific usage or application scenario of the combustible gas detector 3 and the shut-off valve 6 is as follows: A first threshold and a second threshold are preset for the gas concentration detected by the combustible gas detector. When the gas concentration detected by the detector reaches the first threshold, the controller can only issue a warning signal and trigger a low-priority audible and visual alert, without interlocking the liquid supply and equipment operation. Specifically, when the gas concentration detected by the combustible gas detector 3 reaches the preset first threshold, a warning signal is issued. The first threshold is set between a%LEL and b%LEL, which is the lower explosive limit of liquefied petroleum gas (LPG). When the concentration continues to rise and reaches the second threshold, the controller issues an alarm signal and performs the following actions: closing the shut-off valve 6 of the main pipeline 7. Optionally, the feeding conveyor belt 4 can also be stopped, and a high-priority audible and visual alarm is triggered to prompt the operator to inspect and handle the situation. Specifically, when the gas concentration detected by the combustible gas detector 3 reaches the preset second threshold, an alarm signal is issued and the shut-off valve 6 is controlled to close. The second threshold is set to be greater than c%LEL, which is LPG.

[0024] The specific parameters of the first and second thresholds mentioned above can be set within the following ranges: the first threshold is set between 5% LEL and 25% LEL of liquefied petroleum gas (LPG) to indicate normal minor leaks during the filling process; the second threshold is set to a value greater than 50% LEL to determine abnormal leaks and trigger interlocks. For example, in the first production line, the first threshold can be set to 25% LEL and the second threshold to 50% LEL. After an event occurs, the controller records the detected value, the action object, and the timestamp; after confirming on-site that the leak has been eliminated, ventilation and exhaust meet standards, and the pipeline / valve inspection is qualified, the controller performs a reset, sequentially restoring the operation of the liquid supply and feeding conveyor belt 4.

[0025] In practical use, to balance stability and avoid malfunctions, the controller can be configured with short-term acknowledgment and hysteresis for threshold signals, ensuring that the action is executed or released only after the threshold is reached or exited in a stable state. Furthermore, an emergency stop button and alarm can be configured according to actual needs; the emergency stop button is connected to the controller, and pressing it at any time will immediately close the shut-off valve 6, providing redundant protection for manual intervention.

[0026] like Figure 1In the schematic diagram of the liquefied gas filling equipment shown, the feeding end and discharging end of the filling turntable 1 are respectively equipped with feeding conveyor belts and discharging conveyor belts: the feeding conveyor belt transports the cylinders to be filled to the filling turntable 1, and the discharging conveyor belt transports the filled cylinders to the next process, such as an electronic leak detector, a post-filling inspection machine, a sealing machine, or a bottle stacking machine. When the gas concentration detected by the combustible gas detector 3 reaches a preset second threshold, in addition to shutting off the main pipeline supply, the controller simultaneously stops the feeding conveyor belt to reduce the number of new cylinders entering the danger zone and reduce the possibility of sparks generated by collisions between metal components.

[0027] It should be noted that the filling turntable 1 and the electronic filling scale can be products of our company (e.g., LPG filling turntables purchased from Tianjin Changlong Hongye Gas Equipment Co., Ltd.) or existing products on the market; the specific filling and weighing methods are conventional technologies in this field. The combustible gas detector 3 can be a readily available product, such as the GTY-PD21 point-type gas detector. The specific usage and control principle of the controller are conventional technologies in this field, and existing controller products can be purchased.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hazardous gas leakage monitoring and prevention system for a liquefied petroleum gas filling rotary table, characterized in that: The device includes a filling device, around which a combustible gas detector (3) is installed. A shut-off valve (6) is installed on the liquid delivery main pipeline (7) of the filling device. The combustible gas detector is connected to a controller, which is connected to the shut-off valve (6).

2. The system according to claim 1, characterized in that, The filling device includes a filling turntable (1).

3. The system according to claim 1, characterized in that, The combustible gas detector (3) is connected to the controller via a signal line, and the controller is connected to the shut-off valve (6) via a control line.

4. The system according to claim 1, characterized in that, The controller is configured to issue a warning signal when the gas concentration detected by the combustible gas detector (3) reaches a preset first threshold.

5. The system according to claim 4, characterized in that: The first threshold is set to be between a%LEL and b%LEL of liquefied petroleum gas.

6. The system according to claim 1, characterized in that, The controller is configured to issue an alarm signal and control the shut-off valve (6) to close when the gas concentration detected by the combustible gas detector (3) reaches a preset second threshold.

7. The system according to claim 6, characterized in that: The second threshold is set to be greater than c%LEL of liquefied petroleum gas.

8. The system according to claim 1, characterized in that: The shut-off valve (6) includes an automatic shut-off valve or a manual shut-off valve.

9. The system according to claim 8, characterized in that: The automatic shut-off valve includes a pneumatic shut-off valve or an electric shut-off valve, which is used to switch the liquid source on and off by installing the pneumatic shut-off valve or electric shut-off valve on the main liquid delivery pipeline (7).

10. The system according to claim 8, characterized in that: An actuator is provided on the side of the manual shut-off valve, which is used to open and / or close the manual shut-off valve manually or by means of the actuator.

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