Can the embedded industrial computer be used in the gas alarm system of the gas station? What is the gas alarm? It is well known that smoking is strictly prohibited in the gas station of the gas station, and there is an open flame. Once a gas leak occurs, the consequences are unimaginable. Therefore, it has been developed in recent years. The combustible gas leak detection alarm monitors gas leaks in gas stations comprehensively. Once a gas leak occurs and reaches a certain concentration (the concentration is within a safe range), the alarm will promptly alarm and remind people to take a series of safety measures. Because gas filling stations contain flammable and explosive gases, safety protection is very important. In fact, there are many safety protection measures. The installation of flammable gas alarm devices in gas filling stations is an important measure to prevent deflagration and explosion, which can be done in advance. Good protection standards to avoid flammable and explosive accidents.
For example, for example, methane has a high explosion limit and a low explosion limit. Our alarm sets the concentration range to 1{{10}}0 equal parts of the low explosion limit, and then sets it to 100 equal parts of the low explosion limit (this alarm The value is set according to the national installation regulations), the under-report is 25 percent , and the over-report is 50 percent . The mixture of biogas (CH4) and air will cause an explosion when ignited. The volume explosion range of this substance in the air is 5.3 percent 14.0 percent , and the mass is 3593 mg/L. The volume explosion range of the mixture of biogas and oxygen is between 8.25 percent and 55.8 percent . Under direct sunlight, the mixture of methane and chlorine (Cl2) can easily cause an explosion. The explosion limit of methane in the air is generally between 5.3 percent and 15.0 percent . When the methane concentration is lower than 5 percent , it will not explode in a fire, and a combustion layer can be formed on the edge of the flame; when the methane concentration exceeds 15 percent , it can burn in the mixed gas without exploding when it encounters a fire source. The explosion limit of biogas is not fixed and will be affected by many factors, but it is generally considered to be at room temperature, namely LEL (Lower Explosion Limited), that is, the explosion limit, that is, the atmospheric pressure is 5 percent . When detecting methane gas, standard gas production is generally used. For example, the preparation of 25 percent LEL standard gas contains 1.25 percent methane, and the preparation of 50 percent LEL standard gas contains 2.5 percent standard gas. Nitrogen balance is usually used, but dry air can also be used as the balance gas. The methane content is stable and can be used for methane gas monitoring. Therefore, it is necessary to install flammable gas leak detection and alarm devices in gas stations. Of course, take methane gas as an example. The main component of gasoline in gas stations is octane. All flammable gas is the main component of LNG gas stations. It is natural gas, which explodes instantly when it encounters an open flame.
How do you install the combustible gas alarm device in the gas station? What installation height is required? The installation of the combustible gas alarm device in the gas station is very simple. You only need to install the combustible gas alarm probe in the leak-prone area. Near the detection location, and combined with the ratio of detection gas to air, choose a better installation location. The main combustible gas alarm controller needs to be installed in the monitoring room, power distribution room and other places that are convenient for security personnel to monitor, and it is generally installed together with fire protection equipment. The installation height requirements of oil and gas fields are generally in accordance with the requirements of the national regulations on the installation of combustible gas alarms. The installation height is determined by the proportion of the measured gas. If the proportion of the measured gas is lighter than air, the installation height should not be about 30-60 cm from the roof or ceiling. , If the specific gravity is heavier than air, the installation height is about 30-60 cm from the ground. Of course, this is a reference requirement, and the details are determined according to the actual installation environment. For secondary installation requirements, the coverage area of the primary probe is about 20-30 square meters. Because the gas station is located in an outdoor environment, the detection range of the probe is not accurate enough for reference only. There are many external factors and are greatly affected by wind speed. The measured environment is affected by factors such as upwind or downwind. If the gas station is located at about 100 square meters, the probe can be installed 4-5 times. If the probe area is large, increase the probe. The width of the probe should be less than 8, the output signal is 4-20 ma, the connection line between the probe and the controller adopts a 3 X1.5 square signal shielded cable. When there are more than 8 detectors, the output is RS485 bus signal. The connection line between the detector and the controller adopts a 4 X 1.5 square shielded cable. It should be an industrial explosion-proof type. Gas stations should generally be set up with two areas, the oil storage is located underground, to prevent long-term leakage of the tank body of the oil storage, and set up a refueling device.
Under normal circumstances, after the installation and commissioning of the combustible gas alarm device in the gas filling station is completed, no manual operation is required, only intermittent inspection and maintenance of the combustible gas alarm device is enough. For the control of detection sensitivity, it is recommended to perform half-year or one-year testing and calibration of the combustible gas alarm device to improve the detection sensitivity, so that the combustible gas alarm device can maintain fast, accurate and stable characteristics for a long time, and extend the combustible gas alarm device of the gas filling station. Service life.
In the case of frequent accidents at gas stations, knowing more about the use of combustible gas alarm devices is of great significance for the safety and protection of gas stations and gas stations.
Embedded touch industrial computer has the advantages of stable performance, simple operation and convenient maintenance. It can be used in conjunction with a variety of servo drive devices to provide a stable and reliable control platform for gas alarms in gas stations. Committed to the sales of industrial computers, industrial tablet computers, industrial displays and other products, and provide high-end control system overall solutions and OEM/ODM customized services. Products are widely used in vending machines, healthcare, industrial automation, MES system integration, smart equipment, electricity, transportation, smart logistics and other fields.
