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Summary of hydrogen and hydrogen is the upper air sounding an important part of the business, but there is a certain risk of the business. Expounded result of hydrogen combustion and explosion factors, and hydrogen and hydrogen safety and prevention work, that the upper air sounding business The hydrogen and hydrogen safety guidance.

Keywords: high-altitude detection; hydrogen; with hydrogen; Security

< > Will be classified as dangerous goods hydrogen category 2, only a very small energy, such as static electricity spark, enough to cause a fire, explosion. Hydrogen explosion limit is 4.0% ~ 75.6%, lower limit is very low, wide range, in a fire pole explosive. hydrogen relative density of the air is very small, 0.07; diffusion coefficient is very large, 0.634 cm2 / s. Once a large number of leaks, can be a wide range of emission in the air and quickly spread to form explosive mixtures with air and explode in a fire combustion wind quickly spread the flames easily.

A result of factors of hydrogen combustion and explosion
1.1 Direct fire
Including fuel combustion fire and electric power lines sparking and other virtual connection.

1.2 Indirect fire
Including static and lightning. Due to static invisible, intangible, easily overlooked, so the balloon is caused by static electricity sparks fire accident important risks.

1.2.1 of the gas charged. When the gas from the container, or on broken pipe outlet exhaust speed the nature of static electricity when the charged nature of the gas. Gases are generally mixed with solid or liquid impurities. These impurities and gases emitted with high speed so that impurities in the container together with the gas (pipeline) movement, and the container wall (inner wall) friction and collision, in the opposite separation, the particles and the container wall (wall), respectively, the charge to bring the same amount of different signs, that generate static electricity. hydrogen from the cylinder, hydrogen tank, the ball is ejected at high speed when the skin, there is rust inside bottles, water, bolt pad at the impurities such as graphite or aluminum oxide are the main reason for static [1-2 ].

1.2.2 Human charged. When the body is worn clothes made of chemical fiber high resistance, it will carry a high potential. If the body charged with the cylinder, the ball electrode of the opposite belt, the potential difference will be very, very easy to produce static electricity spark. Also, if the casting staff in filling, put gas in the process of stripping action is also prone to static electricity spark. In general, the electrostatic potential generated when the strip is very high.

1.2.3 balloon filling, closing the ball high potential generated in the process. �� charged nature of the gas, when the hydrogen filling hydrogen cylinders from the cylinder or hose to spray the ball through the skin in the process, hydrogen gas bottles (hydrogen cylinder), conduits, leather ball with the role of high electrostatic potential. �� received the ball deflated, the hydrogen gas emitted from the skin after the ball, the ball is the role of skin as a result of high electrostatic potential. If there are impermeable layer of asphalt floor surface, to put hydrogen basic leather ball after the ball when folded skin burn. This is because the ball deflated after skin with a large number of high electrostatic charge, electrostatic surface of the insulation of the building can not be successfully guided addition, folding ball skin area of the skin when the ball decreases, the electrostatic charge per unit area increasing the static electricity spark, causing the ball skin burn.

1.2.4 High-speed exhaust of hydrogen gas generated when the size of static volume factors. �� related with the hydrogen flow rate. Hydrogen flow rate of the larger jet, with the greater power. �� concerned with the amount of impurities. Contained in liquid or solid The more impurities, with more power. �� containers, pipes and spray nozzle and the inner surface of the material nature of the contamination or adsorption layer and so on. generally more plastic than rubber band power.

Links to Research Papers Download http://www.hi138.com 2 hydrogen and hydrogen safety and prevention work
2.1 strengthen the hydrogen safety study, standardize operational processes to enhance security check
Strengthen basic learning, strictly abide by the switch steps to ensure the standardized operation, strengthen the mechanical inspection to ensure smooth pipeline to ensure that the electrolyte cleaning, regular cleaning of filters, from time to time within the cell and then precipitated by adding electrolyte release, often Check the cell voltage, hydrogen for each oxygen analyzer; at least every six months to release 1 water storage tank [3].

2.2 Lightning Protection Measures taken
Lightning protection measures must be good, thunder and lightning damage is very large, must not be discounted, mine facilities, 2 times a year to do testing.

2.3 balloon filling, gas discharge process to prevent static spark
Air breakdown electric field strength 3 500 kV / m, equivalent to 2 flat charge with opposite sign, a difference of 1 cm, when the voltage is 35 kV electric field strength between the two poles. If one of a charged body with the tip or contact area is small, the voltage can be reduced to several thousand volts to the air breakdown spark. Therefore, balloon filling, gas discharge process to prevent static spark is to avoid the air breakdown electric field strength to achieve. �� filling the balloon, the guide must have addition to static measures. hydrogen bottle (hydrogen tank) should be well grounded, static electricity resistance �� 100 ��. can be used in practical work and lightning protection grounding wire or the nearest metal water pipe connection. �� Control when the hydrogen filling velocity, the smaller the better, should generally be �� 8 m / s, in order to minimize static electricity. �� hydrogen containing less impurities. with hydrogen filling hydrogen cylinders, shall be subject to reduce the cooling water vapor and removed before the filling port, channel management, the ball in the dirt skin. �� Operators should wear anti-static clothing as possible, non-wearing nylon, synthetic clothing such as easy to produce static electricity. is prohibited in the balloon filling, deflated field strip and touch a grounded metal object to the release of regular human body static electricity. �� the tip of the smaller object will have a discharge under the electric field strength, it should avoid cutting-edge, sharp close to the cylinder, tube, ball leather, etc. [4 ]. �� received the ball, the ball hung upside down so that the natural emissions of hydrogen, should not man-made emissions of extrusion speed increases with power. to avoid insulating the ground (floor) on the folding ball skin, folding the ball as much as possible before the ball skin contact with skin grounded metal object to discharge static electricity.


3 References
[1] million Banglin, Liu Yuhuai. Hydrogen production system of the safe operation of a number of issues [J]. Ningxia Electric Power, 2007 (5) :51-53.

[2] Liu Wucheng, Shen Yun show. Should pay attention to safety work with hydrogen [J]. South of Science and Technology Information, 1993 (3) :63-65.

[3] Lin was Shun, Wei Haojie.'s Hydrogen storage Technology and hydrogen production status [J]. Energy saving and environmental protection, 2010 (2) :42-43.

[4] Zhang Jingyun. Strengthen the hydrogen continuously improve safety management and technical support level [J]. Meteorology and hydrology Marine Instruments, 2007 (4) :67-69.

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