Application of Industrial computer in Gas alarm system of Gas Station

Can the embedded industrial control computer be applied to the gas alarm system of gas stations? So what's a gas alarm? As we all know, smoking is strictly prohibited in gas stations, and there is open fire, and once gas leakage occurs, the consequences will be unimaginable. Therefore, the combustible gas leakage detection alarm developed in recent years has monitored gas leakage in gas stations. Once gas leakage occurs and reaches a certain concentration (the concentration is within the safe range), the alarm will give an alarm in time to remind people to take a series of safety measures. Because the filling station contains flammable and explosive gases, do a good job.
Full protection work is very important, in fact, there are many kinds of safety protection measures, and the installation and use of flammable gas alarm devices in gas filling stations is an important measure to prevent deflagration and explosion, and the protection standards can be done in advance 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 a low explosion limit of 100 equal points, and then sets it to a low explosion limit of 100 equal points (this alarm value is set according to the national installation code), underreporting 25% and overreporting 50%. A mixture of biogas (CH4) and air that can cause an explosion when ignited. The volume explosion range of the substance in the air is 5.3%-14.0%, and the mass is 35-93 mg/L. The volume baozha of the mixture of biogas and oxygen ranges from 8.25% to 55.8%. The mixture of methane and chlorine (Cl2) is also easy to cause baozha under direct sunlight. The bao limit of methane in the air is generally between 5.3% and 15.0%. If there is no baozha when the methane concentration is less than 5%, a combustion layer can be formed at the edge of the flame; when the methane concentration is more than 15%, it can be burned in the mixed gas without baozha. The baozha limit of biogas is not fixed and will be affected by many factors, but it is generally considered to be at room temperature, that is, LEL (Lower Explosion Limited), that is, baozha limit, that is, atmospheric pressure is 5%. When testing methane gas, it is generally produced by standard gas, for example, the preparation of 25% LEL standard gas contains 1.2% methane, and the preparation of 50% LEL standard gas contains 2.5% standard gas. Nitrogen balance is usually used, and dry air can also be used as equilibrium gas. the content of methane is stable and can be used for methane gas monitoring. Therefore, it is necessary to install flammable gas leak detection and alarm devices at gas stations. Of course, take methane as an example, the gasoline of gas stations is mainly composed of octane, all flammable gases, and the main component of LNG gas stations is natural gas, which is baozha in the event of open fire. How does the gas station install the combustible gas alarm device? What kind of installation height is required? The installation of the combustible gas alarm device in the gas station is very simple, as long as the probe of the combustible gas alarm is installed near the position to be detected which is easy to leak, and combined with the ratio of detection gas to air, a better installation position is selected. 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, usually installed together with fire prevention equipment. The installation height requirements of oil and gas fields are generally in accordance with the national requirements for the installation of combustible gas alarms. The installation height is determined by the specific gravity of the gas being measured. If the specific gravity of the tested gas is lighter than the air, the installation height cannot be about 30-60 cm from the roof or smallpox. If the specific gravity is heavier than the air, the installation height is about 30-60 cm from the ground. Of course, this is a reference requirement. It is determined according to the actual installation environment. Secondary installation requirements, the coverage area of the first probe is about 20-30 square meters, because the gas station is located in the outdoor environment, the detection range of the probe is not accurate enough, jin for reference, there are many external factors, affected by wind speed, and the measured environment is affected by factors such as upwind or downwind, if the gas station is about 100 square meters, the probe can be installed 4-5 times, if the probe area is large, increase the probe. During installation, the width of the probe should be less than 8, the output signal should be 4-20 ma, and the connection cable between the probe and the controller should be 3 x 1.5 square signal shielded cable. When there are more than 8 detectors, the output is a RS485 bus signal. The connection between the detector and the controller uses a 4 x 1.5 square shielded cable. Should be industrial explosion-proof type, gas stations should generally set up two areas, oil depots are located underground to prevent long-term leakage of oil storage tanks, and set up refueling devices. In general, after the installation and commissioning of the combustible gas alarm device in the filling station, there is no need for any manual operation, and the jin needs intermittent inspection and maintenance of the combustible gas alarm device. In view of the control of the detection sensitivity, it is suggested that the combustible gas alarm device should be tested and calibrated for half a year or one year, so as to improve the detection sensitivity and keep the combustible gas alarm device fast, accurate and stable for a long time. Prolong the service life of the combustible gas alarm device in the gas filling station. 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 protection of gas stations and gas stations. The embedded touch-controlled industrial computer has the advantages of stable performance, simple operation and convenient maintenance. it can be used with a variety of servo drive devices, and can provide a stable and reliable control platform for gas alarm in gas station. 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