CS271767B1 - Method of fuel mixture production for injection into blast furnace's tuyeres - Google Patents

Abstract

The scope of the solution is the economical processing of oil shares of coke siphon waters and their use as a partial equivalent of heating oils.The above-mentioned purpose is achieved in the following way: The oil and/or tar shares of the siphon waters together with the particles contained in them are at first liquefied in a volume of 20 to 80% admixture of the heating oil preheated to a temperature of 65 to 90 degrees C. The originated oil mixture is processed in a pearl mill to the oil dispersion, whose hard particles reach maximum dimensions of 0.05 mm and finally this oil dispersion is mixed with the heating oil in a ratio of 0.01 to 0.9 volume parts per one part of the heating oil.<IMAGE>

Description

The aim of the solution is to economically process the oily proportions of coke-oven water and to use them as partial substitutes for fuel oils.

For this purpose, the oil and / or tar fractions of the water droplets are initially combined with the solids contained therein by a 20 to 80% by volume addition of fuel oil preheated to a temperature of 65 to 90 ° C, after which the resulting oil mixture is processed in a bead an oil dispersion mill in which the solid particles reach a maximum size of 0.05 mm and finally this oil dispersion is mixed with fuel oil in a ratio of 0.01 to 0.9 parts by volume per part of fuel oil.

CS 271 767 Bl

BACKGROUND OF THE INVENTION The present invention relates to a process for producing a fuel mixture of fuel oils which is injected into a blown blast furnace.

Numerous gaseous hydrocarbons transported by pipeline contain water particles in the form of droplets and water vapor which condense and flow down to the bottom of the pipeline under certain temperature conditions, carrying oil or tar droplets along with them and flushing mechanical dust particles into the condensate drift transported by gaseous medium. In order to drain the piping, pipelines are connected to the pipeline at different intervals from each other, by means of which these condensation products are discharged into so-called droplets. From the droplets, the mixture of water, mechanical impurities and oils is exported to the repository or incinerated in incinerators, and the heat obtained is usually used for water heating or steam production, which is a typical example of the use of coke-oven drip water. A similar procedure is followed for the treatment of a number of other waste products, for example oil or other organic bituminous materials, and generally wherever the oily fractions are separated from the water by settling and do not form aqueous emulsions. However, all hydrocarbon wastes usually contain mechanical impurities, making it more difficult for them to be used more efficiently in plants using more burner designs. In addition to the oily fractions, the raw coke-oven water also contains other undesirable, harmful and dangerous substances, such as hydrogen sulfide, phenols, cyanides, rhodanides and others, and therefore the droplets are first clarified with powdered alkali and decanted oily fractions As the float withdrawn and the clarified drip water is then further treated with adsorbents and after the final filtration is only freely discharged into the sewer. Decanted oil fractions with mechanical impurities and, in addition, powdered alkali residues can then be burned in various power plants in a manner that does not interfere with residual water and mechanical impurities, but cannot therefore be a full replacement or part of noble liquid fuels such as fuel oils.

The above-mentioned disadvantages are overcome by the fuel mixture which is prepared according to the invention in that the oil and / or tar fractions of the drip water are first mixed with the solids contained therein by 20 to 80% by volume of fuel oil preheated to 65 to 90 °. C, then the resulting oil mixture is processed in a bead mill to an oily dispersion in which the solid particles reach a maximum size of 0.05 mm and finally the oily dispersion is mixed with fuel oil in a ratio of 0.01 to 0.9 parts by volume to one part of heating oils.

The additional fuel component of the fuel oil prepared according to the invention makes it possible to use, with high economic efficiency, the use of the waste liquor as a partial and full-fledged substitute for the fuel oil injected into the blast furnace exhausts.

A practical method of making the fuel composition of the invention is apparent from the following practical example:

By decanting the coke-oven water, a decanted fraction was obtained by overflow from the overflow deemulsification reactor:

drip oil powdered lime carbon ash solids water

51.0% wt.

%, 0 wt.

31.0 wt. 6.0% wt. 8.0 wt.

Some of the selected physical properties of liquid oil are the following:

calorific value density viscosity at 20 ° C flash point freezing point

MJ / kg

1.055 to 1.072 g cm -1

3.9 to 6.1 mm ² . s ~

106 DEG-120 DEG

-10 to -40 ° C

CS 271 767 Bl

The water contained in the decanted oil fractions is not a defect; on the contrary, oils emulsified with water favorably minimize oil droplets when oil enters the high temperature range, since the water expands from the liquid state to superheated steam and breaks up the oil particles upon explosion, optimizing the preparation of the oil for perfect combustion. The particle size distribution of a laboratory sample of the above oily substance showed that 72% of the solid particles were larger than 0.05 mm.

The decanted proportion of tar and tar-contaminated solids, which were the product of the drip water purification technology, was processed in a bead mill to an oily dispersion in which all the solid particles were disintegrated to a size less than 0.05 mm. To facilitate processing on the bead mill, fuel oil preheated to 88 ° C was added to the decanted, particulate matter contaminated; 0.45% by volume of heated fuel oil was added to one volume by volume of the oily decantate to allow sufficient fluidization of the mixture. To avoid undesirable separation of the components of the dispersion at steady state, it was pumped immediately after production into the oil line to the fuel oil inlet in front of the blast furnace outlets, maintaining the flow control of both components so that the resulting fuel mixture of both liquid hydrocarbons contained one part waste and eight parts of fuel oil.

Tests and measurements revealed that the calorific value of the dispersed liquefied waste was 33 MJ / kg and the total calorific value of the mixture of both liquid hydrocarbons before the blast furnace blowers was 39.2 MJ / kg.

Claims (1)

SUBJECT OF THE INVENTION A process for producing a fuel mixture for injection into a blast furnace exhaust wherein one component of the mixture is fuel oil and a precursor of the other component is obtained by separating the oil and / or tar fractions from the dropping water decanted by clarification and powder alkali. or the tar fractions of the dripping water are first combined with the solids contained therein by 20 to 80% by volume of fuel oil preheated to 65 to 90 ° C, then the resulting oil mixture is processed in a bead mill to an oily dispersion in which the solids the particles reach a maximum size of 0.05 mm and finally this oil dispersion is mixed with fuel oil in a ratio of 0.01 to 0.9 parts by volume per part of fuel oil.