Which substances are contained in the coke oven gas?

What substances are in the raw gas - overview

The coke oven gas is extracted by means of dry distillation, which is also known as the so-called. Pryolysis is called, obtained by the hard coal.

• The gas, which also has the quality of city gas when cleaned, has a calorific value of up to 4.5 kW / cubic meter. of the calorific value on half of the natural gas.
• The coking of the hard coal leaves behind gaseous ingredients, the values ​​fluctuate depending on the respective coking plant and its filter systems.
• The substances that are contained in the coke oven gas are sometimes up to 55% hydrogen and around 25% Methane, also contains nitrogen with a percentage of 10%, while carbon monoxide contains 5% omitted.
• The raw gas also contains proportions of carbon dioxide and hydrogen sulfide and Ammonia, aromatics and hydrocarbons are also included, these are largely filtered out.
  instagram viewer


Liquid gas and its calorific value - this is how you can determine it

If you want to heat, you need a fuel. In addition to gas and oil, ...

• During the coking of the coal, the percentage of volatile constituents or Components to approx. 25%, with one ton of hard coal producing around 280 cubic meters of coke oven gas, beyond that it falls Coal tar due to the coking processes, the value of the sticky mass is per ton of coal 55 kg.
• The gas is sucked out of the coke oven so that it is appropriately collected The necessary device is usually located after the gas collection space above the corresponding one Bulk.
• After cooling with water and the resulting tar separation, the raw gas is converted into so-called. Gas scrubbers cleaned. The components that would significantly impair the use of the gas are filtered out, essentially benzene, hydrogen sulfide and naphthalene. These carbon materials are also used again and processed again.

The end product after filtering is called coke or coke oven gas. Sometimes coking plants use the gas to fire under the coke ovens for coking. In this way, the gases produced are directly reused in the course of the coking plant.

The multiple filtering of the distillation products contained in the coke oven gas

Since the amount of waste or Distillation products are significant during coking, which must be filtered out accordingly, In order for a clean coke oven gas to be produced, the filter process is interesting and requires more precise information Consideration.

• The distillation products that arise on the basis of coking rise with a temperature of approx. 700 degrees Celsius the so-called. Ascending pipes, where a collection in the so-called. Submission takes place. In the gas pre-cooler, the temperature of the gas is lowered to 30 degrees, which means that water and tar can condense out to a large extent. Because of the differing density of water and tar, the separating container contains both liquids; these form different layers because of their differing densities.
• To de-tar the gas or For the time being, raw gas has been so-called since the 1950s. Electrostatic precipitator used. This technology allows filtering without significant pressure loss, which occurs during the mechanical separation of the tar constituents.
• The ammonia contained in the gas is washed out by means of the Koppers process, which is carried out by washing with sulfuric acid water.
• After this process, in which the gas was cooled down to 30 - 35 degrees Celsius, the temperature of the gas is increased again to 85 degrees. The water is absorbed by the gas that is produced when the ammonia is neutralized with the sulfuric acid.
• The water is absorbed by the gas that is produced when the ammonia is neutralized with the sulfuric acid.
• The benzene is removed by washing or Cleaning washed out with coal tar oil, sometimes expanded metal inserts or bubble caps are used. The boiling range is approx. 200 - 300 degrees Celsius.
• Various cleaning processes are used to filter the sulfur contained in the raw gas. The wet processes include absorption processes so that hydrogen sulfide or sulfur are extracted.

Both the pure coke oven gas and the substances it contains, such as sulfur and other materials and energy sources are used to the maximum, so that the environment is polluted to a minimum will.