How to inflate the floating balloons for the opening ceremony, which are large advertising balloons

The ball flies up because the gas inside is less dense than air. . . The gases inside are usually hydrogen and helium. . . You can find someone to buy regular canned gas, or you can configure it yourself. .

The main methods of arranging hydrogen include

and electrolysis of water to produce hydrogen

Using iron as the cathode side and nickel as the anode side in series electrolysers (similar in appearance) Filter press) to electrolyze aqueous solutions of caustic potassium or caustic soda. Oxygen comes out of the anode and hydrogen comes out of the cathode. This method is more expensive, but the product has high purity and can directly produce hydrogen with a purity of more than 99.7%. Hydrogen of this purity is often used as: ① Reducing agent, protective gas and heat treatment of permalloy used in the electronics, instrument and meter industries, ② Reducing agent used in the production of tungsten, molybdenum, cemented carbide, etc. in the powder metallurgy industry , ③ Preparation of semiconductor raw materials such as polycrystalline silicon and germanium, ④ Hydrogenation of grease, ⑤ Cooling gas in dual hydrogen internal cooling generators, etc. For example, the Beijing Electronic Tube Factory and the Gas Factory of the Academy of Sciences produce hydrogen through water electrolysis.

2. Hydrogen production by water gas method

Using anthracite or coke as raw materials and reacting with water vapor at high temperature to obtain water gas (C+H2O→CO+H2—heat). After purification, it is passed through a catalyst together with water vapor to convert the CO into CO2 (CO+H2O→CO2+H2) to obtain a gas with a hydrogen content of more than 80%. It is then pressed into water to dissolve the CO2, and then passed through Pure hydrogen is obtained by removing residual CO from ammonia-containing copper formate (or ammonia-containing copper acetate) solution. This method of hydrogen production has low cost, large output, and requires more equipment. This method is often used in synthetic ammonia plants. Some also synthesize methanol from CO and H2, and a few places use less pure gas with 80% hydrogen for artificial liquid fuel. This method is often used by Beijing Chemical Experimental Plant and small nitrogen fertilizer plants in many places.

3. Hydrogen production from syngas and natural gas produced by thermal cracking of petroleum

The hydrogen production by-product of thermal cracking of petroleum is very large and is often used in gasoline hydrogenation, petrochemical and fertilizer plants. This hydrogen production method is used in many countries in the world. In my country's petrochemical bases such as Zaiqing Fertilizer Plant and the petrochemical base of Bohai Oilfield, this method is used to produce hydrogen

Also It is used in some places (such as Bay, Way and Batan Rougo hydrogenation plants in the United States, etc.).

4. Hydrogen production by freezing coke oven gas

The initially purified coke oven gas is frozen and pressurized to liquefy other gases and leave hydrogen. This method is used in a few places (such as the Ke Mepobo factory in the former Soviet Union).

5. Hydrogen by-product of electrolysis of salt water

In the chlor-alkali industry, a large amount of relatively pure hydrogen is produced. In addition to being used for the synthesis of hydrochloric acid, there is a surplus, and it can also be purified to produce hydrogen. Or pure hydrogen. For example, the hydrogen used in the Second Chemical Plant is a by-product of electrolyzed brine.

6. By-products of the brewing industry

When corn is used to ferment acetone and butanol, more than 1/3 of the waste gas from the fermentation tank contains hydrogen. After multiple purifications, it can produce ordinary Hydrogen (more than 97%), pure hydrogen (more than 99.99%) can be produced by further removing impurities (such as a small amount of N2) through silica gel tubes cooled to below -100°C with liquid nitrogen, such as in Beijing Brewery This by-product hydrogen is used to bake quartz products and is used by external units.