The earth is very rich in hydrogen. For example, our common water and various hydrogen-containing compounds are rich in hydrogen. So what methods of H2 production are used in industry?
Hydrogen from coal
In the coking of coal, coke is produced from coal at a high temperature of 900-1000 degrees in isolation from the air. At the same time, coke oven gas is produced, and the coke oven gas contains 55%-60% H2 . The gasification of coal, the coal is under high temperature and atmospheric pressure or under pressure. It can react with water vapor or air to form vapors. Different gasification methods will produce different contents of H2.
Natural gas hydrogen production
H2 production from natural gas is the substitution of carbon in methane for H2 in water. A displacement reaction occurs and heat is provided. Most of the hydrogen comes from water, and a small part comes from natural gas. Steam gasification and conversion of natural gas is a common method for H2 production. High output, low cost, and low emission of greenhouse gases.
Hydrogen production by water electrolysis
H2 production by water electrolysis is the most mature method for producing hydrogen, with a history of more than 80 years. The essence is that electrical energy opens the bond of H2 and oxygen to generate hydrogen and oxygen. The H2 produced by water electrolysis has high purity, but consumes a lot of power.
In addition, there are methods such as partial oxidation of heavy oil to produce H2 and separation and recovery of by-product H2. It is known that H2 is flammable and explosive, and the amount of H2 produced in industry is large and high in concentration. Reasonable and safe monitoring is a very important issue.
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