Fixed combustible gas detection device

Abstract

The invention discloses a fixed combustible gas detection device. The device comprises a main control system; the gas sampling module is in signal connection with the main control system, receives the operation signal from the main control system, detects gas in the area / space according to the operation signal, and transmits a detection result to the main control system; the main control system receives the detection result from the gas sampling module, analyzes the detection result to obtain an analysis result, and converts the analysis result into an alarm instruction; the alarm device is in signal connection with the main control system, continuously receives the alarm instruction from the main control system and determines whether to give an alarm or not according to the alarm instruction; the combustible gas monitoring device has the advantage of monitoring combustible gas in real time.

Description

Technical Field

[0001] The invention relates to the technical field of alarm equipment, and in particular to a fixed combustible gas detection device. Background Art

[0002] Combustible gas refers to substances that can be ignited and are in gaseous state at normal temperature and pressure; for example, hydrogen, acetylene, ethylene, ammonia, hydrogen sulfide, etc.; once combustible gas leaks, there is a safety hazard. Summary of the invention

[0003] The purpose of the present invention is to provide a fixed combustible gas detection device, which has the advantage of real-time monitoring of combustible gas.

[0004] To achieve the above-mentioned purpose, the present invention provides a fixed combustible gas detection device, which includes: a main control system; a gas sampling module, which is connected to the main control system by signal, receives an operation signal from the main control system, detects the gas in the area / space according to the operation signal, and transmits the detection result to the main control system; the main control system receives the detection result from the gas sampling module, analyzes the detection result to obtain an analysis result, and converts the analysis result into an alarm instruction; an alarm device, which is connected to the main control system by signal, continuously receives the alarm instruction from the main control system, and issues an alarm according to the alarm instruction.

[0005] Preferably, the main control system further comprises: a display for displaying the operation signals and alarm instructions of the main control system, the detection results of the gas sampling module, and the working status of the alarm device.

[0006] Preferably, the gas sampling module includes: a gas fixed-point detection mode, wherein the fixed-point detection refers to the main control system sending an operation signal to the gas sampling module, requiring the gas sampling module to detect the gas in the area / space at several specified time points respectively, and obtain several corresponding gas detection results.

[0007] Preferably, the gas sampling module includes: a gas circulation detection mode, wherein the circulation detection refers to the main control system sending an operation signal to the gas sampling module, requiring the gas sampling module to continuously detect the gas in a certain area / space within a certain period of time, and obtain the continuous change trend of the gas detection results within a certain period of time.

[0008] Preferably, the gas sampling module is provided with an explosion-proof fire-blocking device. When combustion / explosion occurs in the gas sampling module, the explosion-proof fire-blocking device automatically operates to prevent the combustion / explosion from spreading to the surrounding space.

[0009] Preferably, the gas sampling module adopts a LEL infrared detector.

[0010] Preferably, the gas sampling module adopts a catalytic gas detector.

[0011] Preferably, the gas sampling module adopts an oxygen detector.

[0012] In summary, compared with the prior art, the fixed combustible gas detection device provided by the present invention has the following beneficial effects:

[0013] First, the present invention detects external gas in real time and can take corresponding measures once a leak occurs.

[0014] Second, the present invention proposes a variety of specific design paths to facilitate combination in specific applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Reference numerals:

[0017] 1- Main control system, 2- Gas sampling module, 3- Alarm device. DETAILED DESCRIPTION

[0018] The following will be combined with the attached embodiment of the present invention Figure 1 , the technical solutions, structural features, objectives achieved and effects in the embodiments of the present invention are described in detail.

[0019] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0020] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0021] The present invention provides a fixed combustible gas detection device, which is mainly used for combustible gas concentration detection of LNG (Liquefied Natural Gas) ships; the device can detect the combustible gas concentration in a certain area / space, and then issue an alarm command when the combustible gas concentration reaches a certain threshold, thereby ensuring the safety in the area / space.

[0022] like Figure 1 As shown, the device comprises:

[0023] A main control system 1, wherein the main control system 1 sends operation signals to other components; wherein the operation signals include but are not limited to setting parameters of other components during operation, operation instructions of other components, etc.;

[0024] A gas sampling module 2, wherein the gas sampling module 2 is connected to the main control system 1 by signal, receives an operation signal from the main control system 1, detects the gas in the area / space according to the operation signal, and transmits the detection result to the main control system 1;

[0025] The main control system 1 analyzes the received detection results to obtain analysis results, and converts the analysis results into alarm instructions;

[0026] The alarm device 3 is connected to the main control system 1 by signals, continuously receives alarm instructions from the main control system 1, and decides whether to issue an alarm and what kind of alarm to issue according to the alarm instructions.

[0027] Among them, the detection results of the gas sampling module 2 will have different forms of expression according to the different operating signals received. For example, the main control system 1 transmits instructions for detecting methane and hydrogen sulfide to the gas sampling module 2, and the expression of the detection results lies in the parameters of methane and hydrogen sulfide. In addition, the main control system 1 can set parameters such as the sampling time and sampling period of the gas sampling module 2 through the operating signal. Therefore, in specific applications, fixed-point and directional detection can be achieved through the operating signal according to the actual gas situation.

[0028] The detection result of the gas sampling module 2 is data such as the concentration / properties of the gas in the area / space where the gas sampling module 2 is located; the analysis result is the result of the main control system 1 judging and calculating the detection result, such as judging whether to issue an alarm under the current concentration and what level of alarm to issue, etc.; among them, the analysis result is the key factor in determining whether the alarm device 3 issues an alarm and what level of alarm to issue.

[0029] The analysis result refers to converting the gas parameters into trend / change parameters, etc., and by comparing the trend / change parameters with the set threshold, a judgment result such as whether to issue an alarm and what level of alarm to issue is obtained, which facilitates subsequent alarm instructions.

[0030] The alarm instruction is a way of converting the analysis result into a single instruction, thereby facilitating the alarm device 3 to read and reducing the operation procedures of the alarm device 3; if the process of analyzing the detection results is set on the alarm device 3, then the burden of the alarm device 3 will be increased, which is not conducive to the timely response of the alarm device 3.

[0031] In addition, the alarm device 3 is used to continuously receive alarm instructions, thereby ensuring the continuity of data transmission and reducing the problem of delayed alarm issuance due to untimely transmission.

[0032] In a specific embodiment, in order to realize real-time reading of detection results and capture of the operation status of the main control system 1, the gas sampling module 2 and the alarm device 3, the main control system 1 also includes: a display for intuitively displaying operation signals and detection results, specifically including the ability to display the operation signals and alarm instructions of the main control system (1), the detection results of the gas sampling module (2), the working status of the alarm device (3), etc.; for example, the display can display the combustible gas concentration value in different areas / spaces, whether the alarm device 3 is operating normally, whether the alarm instruction is continuously transmitted, etc.

[0033] Regarding the gas sampling module 2, the gas sampling module 2 includes two detection modes:

[0034] (1) Gas fixed-point detection mode. When in this mode, the gas sampling module 2 is connected to the main control system 1 by signal, receives the operation signal from the main control system 1, performs fixed-point detection of the gas in the area / space, and transmits the detection result to the main control system 1;

[0035] Among them, fixed-point detection means that the main control system 1 sends an operation signal to the gas sampling module 2, requiring the gas sampling module 2 to detect the gas in the area / space at several specified time points; for example, the detection is set at 5 o'clock and 7 o'clock, and two gas detection results corresponding to these two time points are obtained.

[0036] (2) Gas circulation detection mode. When in this mode, the gas sampling module 2 is connected to the main control system 1 by signal, receives the operation signal from the main control system 1, performs circulation detection on the gas in the area / space, and transmits the detection result to the main control system 1;

[0037] Among them, the cycle detection refers to the main control system 1 sending an operation signal to the gas sampling module 2, requiring the gas sampling module 2 to continuously detect the gas in a certain area / space within a certain period of time, so as to obtain the continuous change trend of the gas detection results within the time period. Compared with the results of fixed-point detection, it has the advantage of being able to analyze the change trend of gas properties;

[0038] For example, the main control system 1 can be used to set the gas sampling module 2 to continuously detect the gas sample at a time interval of no more than 30 minutes per cycle. After analyzing the detection results for concentration changes, the main control system 1 converts the analysis results into an alarm instruction and transmits them to the alarm device 3; as mentioned above, the detection is set to be performed in the time period from 5:00 to 5:30, that is, a trend chart of the continuous change of gas concentration in a time period is obtained; if the concentration of the combustible gas changes by more than 5% within 1 minute, the alarm instruction is for the alarm device 3 to issue an alarm at the normal level.

[0039] In addition, in order to deal with the situation where the gas sampling module 2 burns / explodes during the process of detecting combustible gas, an explosion-proof fire-blocking device is provided on the gas sampling module 2. When the gas sampling module 2 burns / explodes, the explosion-proof fire-blocking device will automatically operate due to temperature increase or impact to prevent the combustion / explosion from spreading to the surrounding space; specifically, the explosion-proof fire-blocking device should be arranged near the gas detection port, because this part serves as the gas input part, and the problem of combustion / explosion is solved by blocking the input of combustible gas.

[0040] In a preferred embodiment, the alarm device 3 can realize the alarm level types in different gas leakage situations by setting different gas alarm values; for example, when the concentration of methane reaches 1.0%, the first alarm is issued; when the concentration reaches 1.2%, the second alarm is issued. Compared with the first alarm, the second alarm covers a wider response range and can be associated with other safety devices to help operators deal with accidents directly.

[0041] The above are specific structures and preferred embodiments. The specific application components of the above components will be introduced below:

[0042] In a specific embodiment, a plurality of detectors may be used on the gas sampling module 2, which are respectively arranged in different areas / spaces to detect the various properties of the gas in different areas / spaces to achieve the aforementioned technical effects; at this time, a plurality of alarm devices 3 may be arranged, and the alarm devices 3 are arranged corresponding to the detectors. Once an abnormality occurs in a certain detector, the corresponding alarm device 3 will work, which can play the role of timely notification and clearly know the specific alarm area / space.

[0043] In a specific embodiment, the gas sampling module 2 uses a number of LEL (lower explosion limit) infrared detectors to detect the concentration of the gas by infrared;

[0044] The lower explosion limit refers to the minimum concentration of combustible gas in the air to form an explosive gas mixture. If the concentration of combustible gas in the air is lower than this concentration, the gas environment cannot form an explosion. Taking methane as an example, according to Appendix C of the "Design Specifications for Electrical Installations in Explosive Atmospheres" (GB 50058-2014), the lower explosion limit of methane is 5%. According to the requirements of the "Petrochemical Combustible Gas and Toxic Gas Detection Alarm Design Standard", the first-level alarm setting value of the LEL infrared detector is 25%. When the detection results of the LEL infrared detector show that the methane volume content is greater than or equal to 5%×25%=1.25%, according to the analysis results, the alarm device 3 issues the first alarm.

[0045] In another preferred embodiment, the gas sampling module 2 uses a number of catalytic gas detectors, the principle of which is:

[0046] The catalytic gas detector uses the thermal effect principle of catalytic combustion. It consists of a detection element with a catalyst on the surface and a variable resistor (either proportional or inversely proportional) to form a circuit. When the concentration of combustible gas in the air increases, the combustible gas burns flamelessly under the action of the catalyst on the surface of the detection element. The temperature of the catalytic gas detector rises, and the internal variable resistor also changes accordingly, causing the circuit to lose balance and output an electrical signal related to the combustible gas concentration. By measuring the electrical signal and then analyzing the magnitude of the resistance change, the concentration of the combustible gas can be determined.

[0047] The above are two specific embodiments of the gas sampling module 2, and those skilled in the art can achieve equivalent technical effects through equivalent replacement.

[0048] In addition, in certain high-risk environments, the gas sampling module 2 uses a number of oxygen detectors to detect the oxygen concentration in real time; because when the oxygen concentration reaches a certain value, the probability of combustion / explosion will also increase, and then by detecting the value of the oxygen concentration, the oxygen concentration is adjusted at all times to prevent the probability of combustion / explosion from being reduced.

[0049] Regarding the maintenance of the device, the area where the device is installed should be ventilated in time and the temperature should be controlled to facilitate installation and future maintenance work.

[0050] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A fixed combustible gas detection device, characterized in that: The device comprises: Main control system (1); A gas sampling module (2), wherein the gas sampling module (2) is connected to the main control system (1) by signal, receives an operation signal from the main control system (1), detects the gas in the area / space according to the operation signal, and transmits the detection result to the main control system (1); The main control system (1) receives the detection results from the gas sampling module (2), analyzes the detection results to obtain analysis results, and converts the analysis results into alarm instructions; An alarm device (3) is connected to the main control system (1) by signal, continuously receives alarm instructions from the main control system (1), and issues an alarm according to the alarm instructions.

2. A fixed combustible gas detection device according to claim 1, characterized in that: The main control system (1) further comprises: a display for displaying the operating signals and alarm instructions of the main control system (1), the detection results of the gas sampling module (2), and the working status of the alarm device (3).

3. A fixed combustible gas detection device according to claim 1, characterized in that: The gas sampling module (2) comprises: a gas fixed-point detection mode, The fixed-point detection refers to the main control system (1) sending an operation signal to the gas sampling module (2), requiring the gas sampling module (2) to detect the gas in the area / space at several designated time points and obtain several corresponding gas detection results.

4. A fixed combustible gas detection device according to claim 1, characterized in that: The gas sampling module (2) comprises: a gas circulation detection mode, The cyclic detection refers to the main control system (1) sending an operation signal to the gas sampling module (2), requiring the gas sampling module (2) to continuously detect the gas in a certain area / space within a certain period of time, and obtain the continuous change trend of the gas detection results within a certain period of time.

5. A fixed combustible gas detection device according to claim 3 or 4, characterized in that: The gas sampling module (2) is provided with an explosion-proof fire-blocking device. When combustion / explosion occurs in the gas sampling module (2), the explosion-proof fire-blocking device automatically operates to prevent the combustion / explosion from spreading to the surrounding space.

6. A fixed combustible gas detection device according to claim 5, characterized in that: The gas sampling module (2) adopts a LEL infrared detector.

7. A fixed combustible gas detection device according to claim 5, characterized in that: The gas sampling module (2) adopts a catalytic gas detector.

8. A fixed combustible gas detection device according to claim 5, characterized in that: The gas sampling module (2) adopts an oxygen detector.

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