DE13395C - Process and apparatus for the recovery of ammonia, tar and other distillation products from the gases of the coke ovens - Google Patents

Description

IMPERIAL

PATENT OFFICE.

GREAT

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Fuels.

products from the gases from the coke ovens.

In order to protect the gases and distillates developing from the coals poured into the glowing coke oven from decomposition and regrouping into other worthless products, we are now listing ours in PR No. 8174 described immersion tubes, which have proven themselves, but are very expensive, in the suction tube α coming out of the furnace, a fine jet of steam b . against, which we depending on the heat of the furnace and the evolution of the gases down to the coals or. Blow down coke. A second jet of steam, c, can be carried up from the lowest part of the suction pipe, depending on the need and the progress of the coking in the furnace, also with the suctioned-off gases.

We chose a Büttgenbach system coke oven in the drawings, but we did the device can also be used with all other furnace systems with minor modifications. The apparatus and their placement become adapted to the system, and in particular the gas extraction can just as well be done from the side, than happened from above.

With this steam introduction with and against the gases, which is possible in two ways, we can regulate the pressure and tension in the furnace as we do according to the temperature of the furnace and the stage of coking are beneficial can accelerate coking and delay.

The position of the throttle valves d mounted in the suction pipe still makes it possible to support the effects of the steam jets, as well as the furnace from the suction pipe. system completely, whereupon the gases take their old way again.

The above-mentioned steam inflow into the suction pipe never leaves the walls of the same become glowing, but then the steam also mixes intimately with the gases and binds a large part of their heat, so that in this way a conversion into other products is counteracted in the most effective way by excessively high temperature.

The gases pass from the suction tubes into a spacious channel e, the ceiling of which is cooled by means of water, namely by means of ammonia water.

A powerful Exhaustor g, or better two gg attached to one end of this channel, suck the gases out of this and blow them into a second, almost as wide channel h, which lies above the cooling water of the first channel and also through over its upper ceiling located ammonia water i, so from above and below, is cooled. From this second channel, the gases enter already significantly cooler in a great condenser k, where the same tubes driven through // which means they are held m the surrounding water cool. The water flows against the gases around these tubes.

Are the gases passed through a pair of systems of tubes whose cross section gemäfs cooling is getting smaller, they are driven by water 0 η also still in the minor junction boxes, where they. the last

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Claims (3)

The rest of their condensable admixtures are robbed. As a result of this arrangement of the condenser, very different products are obtained in the individual compartments, as in a fractionated distillation, in addition to the ammonia water, namely from the long collecting tank e and h and from the first compartments, the condenser tar and heavy tar oils, from the in other sections, after the end, the tar oils become lighter and lighter, and finally, if there is much sulfur in the coal, even carbon disulfide. After the gases leave the condenser almost completely dry and cool, they can be used in any way. Either you use them as luminous gas, where they then have to be cleaned in the usual way, or you can use them uncleaned for heating and firing any system. Since they are only sucked out of the coke oven for at most half of the entire coking period, there are usually enough flammable and hot gases available, except for the coke ovens themselves, for steam boiler heating and for evaporation. Some of the coke gases are used as luminous or heating gas, but this use is forbidden in the case of low-gas, lean coals, and it is better to use the gases in such a case only to keep the coke ovens glowing. The condensation water running off from the long channels and the individual sections of the condenser (fresh water is only let into the last three boxes of the condenser at the beginning of the operation) are collected in just as many individual basins where they can cool and the tar and added to them oily parts partly over, partly under the water. When pouring into these collecting basins, a jet of dilute sulfuric acid is added to these waters, so that they are completely saturated, i.e. everything pure and carbonic acid ammonia contained in them is converted into sulfuric acid ammonia, but in such a way that the liquid is never acidic, but only neutral. For this purpose, depending on the sulfur content of the coal used, more or less sulfuric acid is needed, since the coke gases, which contain sulfuric acid, are likely to form sulfuric acid themselves when mixed with water vapor, which then comes into contact with the free ammonia and is bound with it. The saturated and cooled liquid, deprived of its tar and oil (one needs sales basins for at least three days), which only contains the sulfuric acid ammonia, is then lifted into the basin on the condenser by means of an injector or pump, from where it is lifted into the uppermost box i over the long gas collecting box and from this into the lower box located between the two gas boxes / flows off, so that it itself, by withdrawing its heat from the gases, is preheated, evaporated and consequently more concentrated. This concentration can be increased to any degree by interrupting or reducing the flow, since there is always superfluous heat. The two evaporation and / or evaporation built into the gas collection box. Cooling boxes i and /, in which the concentration is to be effected, are lined with lead so that they are not attacked too much by the excess sulfuric acid. From the last, lowest box, the much more concentrated solution flows into a kettle, where it is oversaturated with milk of lime, and the ammonia which has become free is distilled off by the vapors introduced. The ammonia vapors are passed into 6% sulfuric acid, where they are transformed into sulfuric acid ammonia, which is crystallized out and obtained as a fairly pure salt. Godfather ν τ claims: 1. The introduction of steam against and with the gases in the suction pipes to the coke oven to cool them, to mix of the steam with the gases and to regulate the course of the coking process. 2. Construction and arrangement of the large gas collection box for cooling the gases and for preheating and evaporation of the ammonia water. 3. Construction and arrangement of the condenser, especially with regard to the through the separation of the individual distillation products brought about by it. 1 sheet of drawings.