CS217221B1 - Method of disposal of heavy tar sludge - Google Patents

Abstract

Method for disposal of heavy tar sludge from pressure gasification of brown coal with a vapor oxygen mixture in generators. The purpose of the invention is to dispose of heavy tar sludge, which is now ballast from the point of view of pressure gasification. According to the invention, the tar sludge is not injected into a pressureless generator for brown coal gasification. Distillable substances are distilled from the tar sludge in the generator and the remaining coal grains are then gasified together with the gasified coal.

Description

BACKGROUND OF THE INVENTION The present invention relates to methods for the disposal of heavy tar sludge which are removed from the steam gasification mixture of brown coal. Tar sludge is a mixture of heavy tars and coal dust leaving the generator as a drift and is an undesirable by-product in the operation of a pressurized gas plant.

So far, tar sludge has been disposed of in two ways. They are sprayed back into the pressure generators or transported to a special landfill. The method of disposing of sludge by depositing it in a separate landfill is contrary to environmental hygiene requirements and is uneconomical, since the sludge is a high calorific material, the landfill sites are very large and their construction is economically very expensive due to the need to prevent leakage.

The spraying of tar sludge back into the pressure generators operating at a pressure of approximately 2.7 MPa requires a special pressure apparatus.

According to the invention, the above-mentioned drawbacks are eliminated by a process for the disposal of heavy tar sludge from the pressure gasification of brown coal. Its essence lies in the fact that heavy tar sludge is sprayed into a non-pressurized coal gasification generator.

This method is less energy-intensive compared to spraying tar into pressure generators, the apparatus is simpler and, due to the lower pressure of the device into which the tar is sprayed, the risk of blockage of the apparatus by coal drift is less.

The advantage of the tar sludge disposal method is also the use of the tar sludge composition. A part of the hydrocarbons contained in the sludge is distilled off in the generator, which is then trapped in the tars that are removed. Non-distilling components of sludge under temperature conditions in gener. Likewise, coal drift along with coal will be gasified. This will improve the overall economic balance of low-pressure gasification.

A further advantage of the inventions lies in the possibility of avoiding the need to store tar sludge in special landfills. The disposal method also allows the treatment of tar sludge now stored in landfills for many years.

The method of disposal of heavy tar sludge according to the invention is described in more detail in the following example:

Tar sludge containing 32% by weight of mechanical impurities, specific gravity 1.14.10 ^ kg / nP / at 20 ° C /, and 12% by weight water and 11.1% ash was injected into a flow reactor heated to 800 ° C. . From 100% of the tar sludge sprayed in the individual fission streams, a weight concentration composition was obtained: gas il%, liquid condensates 55% and solid carbon residue 33% ·

Claims (2)

SUBJECT OF THE INVENTION What is claimed is: 1. A method of disposing of heavy tar sludge from a brown coal pressure gasification process, characterized in that heavy tar sludge is injected into a non-pressurized coal gasification generator. 2. A method of disposing of heavy tar sludge according to claim 1, characterized in that the tar sludge is ground before being injected into the generator.