【Q&A Question 165】June 14, 2017
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This post was last edited by 955559 on 2017-7-21 23:11. [Q&A Question 165] June 14, 2017: What is the explosion limit of hydrogen and what are its hazards? The reference answers can be seen after replying; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Flammability range: 4.1–74.2%; Hazards: In air, H2 has a very low ignition energy – even a tiny flame can cause an explosion, and intense shocks can also lead to one, as H2 is highly flammable, easy to diffuse, has a high combustion temperature, and possesses great explosive power. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with detailed explanations; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have started) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have started) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html
Explosion limit: 4.1–74.2%； Hazards: In air, hydrogen has a very low ignition energy; even a tiny flame can cause an explosion, and even strong shocks can lead to one as well. This is because hydrogen is highly flammable and explosive, has a high combustion temperature, and possesses great explosive power.
Explosion limit: 4.1–74.2%； Hazard: In air, hydrogen has a very low ignition energy; even a tiny flame can cause an explosion, and even strong shocks can lead to one as well. Hydrogen is highly flammable and explosive, with a high combustion temperature and great explosive power.
This post was last edited by he*aoyu8911 on 2017-6-14 07:20. The explosion limit of hydrogen is 4.1%–74.2% (by volume)
Explosion limit: 4.1–74.2%； Hazards: In the air, H2 has a very low ignition energy; even a tiny flame can cause an explosion, and even a strong shock can lead to one as well. This is because H2 is highly flammable and explosive, has a high burning temperature, and possesses great explosive power
4% to 75%. 1) Due to its low viscosity and strong permeability and diffusivity, it is highly prone to leakage during production, storage, transportation, and use, and is not easily detected by people ； Due to its low density, it tends to accumulate on the tops of equipment, containers, and buildings, and can catch fire or explode when exposed to an ignition source or heat. (2) The ignition energy is low, at only 0.019 mJ. (3) It has a wide explosion limit range of 4%–75%, with a detonation range of 18%–59%. Moreover, this explosion limit range widens further as pressure and temperature increase. When mixed with chlorine, it can explode upon heating or exposure to sunlight ； It explodes immediately when mixed with fluorine. (4) Once a fire breaks out, its flame has a high temperature and spreads rapidly, easily causing significant losses.
The explosive limit of hydrogen is 4.0% to 75.6% (volume concentration)；
The explosion limit of hydrogen is 4.0% to 75.6%; when mixed with air, it can form explosive substances, and it is highly prone to combustion and explosion in the presence of open flames or high temperatures. Gases are lighter than air; when used and stored indoors, any leaks will rise and remain trapped under the roof, making it difficult for them to escape. They can explode upon contact with sparks.
4.1%~74.1% Hazard category: Class 2.1 – Flammable gases. Route of exposure: Inhalation. Health hazards: This substance is a physiologically inert gas; asphyxiation occurs only at high concentrations, due to the reduced oxygen partial pressure in the air. At very high partial pressures, hydrogen can exhibit **activity**. It is harmless to the environment. When mixed with air, it can form an explosive mixture that explodes upon exposure to heat or an open flame. Gases are lighter than air; when used and stored indoors, any leaks will rise and remain trapped under the roof, making it difficult for them to escape. They can explode upon contact with sparks. Hydrogen reacts violently with halogens such as fluorine, chlorine, and bromine.
Explosion limit: 4.1–74.2%; Hazards: In air, H2 has a very low ignition energy – even a tiny flame can cause an explosion, and intense shock waves can also trigger one. This is because H2 is highly flammable and explosive, has a high combustion temperature, and possesses great explosive power.
4.1–74.2 v%: Hydrogen has a low ignition capability but high explosive power; it is flammable and explosive, features a high combustion temperature, and possesses great explosive force.