Застосування of газ детектор in tunnel
The toxic and harmful gases in the tunnel are very dangerous, and if the construction is not done true, major safety accidents will easily vosily happenly. Harmful gases in the tunnel mainly include methane, carbon monooxide, carbon dioxide, hydrogen sulfide, азот і варіювання кількість of важкі вуглеводні and trace кількість of рідкісних газів.
The main components of the flammable gas in the tunnel are methane (CH4, gas) and some летючий органічні сполуки (VOC). The main danger is the explosion caused by gas comburntion. However, certain conditions must be met for the explosion of combustible gas, such as a certain amount of combustible gas, enough oxygen and an ignition source. the above three conditions are are незамінні. The газ концентрація at which a flammable gas explodes is usually called the lowest explosion limit, generally expressed in LEL. Different Bustible gases have different LELs. Тому, for the detection of combustible gases, its LEL is generally detected.
The toxic gases in the tunnel are divided into three categories according to їх different механізми of action on the human body: подразнюючі гази, задушливі гази і гостре отруєння органічні гази (ЛОС).
The first category: подразнюючі гази include [chlorine, phosgene, diphosgene, сірка діоксид, азот оксиди, формальдегід, аміак, ozone] and інше гази. the характеристика of the action of подразнююча газ on the body is that it has a сильний стимулюючий ефект on the шкіра and mucous мембрани, and some of them have a strong corrosive effect at the same time.
The second category: Asphyxiating gases include [carbon monoxide, hydrogen sulfide, hydrogen cyanide, carbon dioxide, nitrogen, methane, ethane, ethane, ethylene, vapor of nitrobenzene, hydrogen cyanide] and other gases. These compounds lead to hypoxia of tissue cells after entering the body. It is worth mentioning that methane (CH4) can also be an asphyxiating gas. It self has no obvious toxicity to the body. The гіпоксія of тканина клітини caused by it is actually hypoxic asphyxia caused by the зниження in the концентрація in the вдихуване повітря. гостре отруєння органічні розчинники include n-гексан, dichloromethane, тощо.
The third category: three categories of гостре отруєння органічні гази (VOC). The вищезгадані органічні летючі сполуки, like the вищезгадані неорганічні токсичні гази, will also cause harm to the the human respiratory system and nervous system, and some are carcinogenic, such as benzene. Оскільки органічні сполуки є в основному легкозаймисті речовини, most of the detection of organic сполуки used to detect its explosiveness, but the lowest explosion limit of organic compounds is far greater than its MAC (Maximum Allowable Concentration in Space) value. In other words, it is required and need to detect the toxicity of organic compounds. Such as n-hexane, dichloromethane, etc. однак, it is usually the value when the the volvosive limit (LEL) концентрація of the gas is not reached. Its toxicity has already caused harm to the body, so for the detection of organic compounds (VOC), we we must first test the toxicity, and then test the вибух.
For the the safety of tunnel construction, we need to monitor the концентрація токсичних газів in the tunnel in real time. Portable four-in-one gas detectors are frequent often in tunnels to detect flammable gases, carbon monoxide, водень сульфід і кисень at the same time, real-time detection, sound, sound, and vibration alarm, so as to ensure the safety of staff.
