DE1143179B - Process for coke cooling with abortion wastewater containing fixed ammonium salts - Google Patents

Description

Process for coke cooling with abortion wastewater containing fixed ammonium salts The invention relates to the widely known use of sensible heat of glowing coke masses freshly ejected from the coke ovens.

It is known to use the vapors produced during the extinguishing to utilize indirect generation of steam in connected steam boilers. In particular this has already been done with vapors that were released when the coke was extinguished in Pressure vessels are generated.

Ordinary water is generally used for extinguishing, es but is also known for this purpose waste water from gas cleaning, which is still fixed ammonium salts contain, to use and to eliminate them in the process of the river courses if possible not to hinder for fish farming. When using ammonia-containing Up to now, the coke has always been extinguished in wastewater at normal pressure and the resulting vapors are discharged into the atmosphere because those from the ammonia salt containing vapors contain acidic components. Therefore, their use is e.g. B. not possible in steam engines.

Also the draining of these mist-forming and also otherwise harmful to health Vapors released into the open air cause unbearable air pollution in industrial areas with himself. Also the previous elimination of the free ammonia brought in this Regarding no satisfactory success, because the formation of acidic vapors the not yet pre-cooled coke is the real cause of the problems. This known procedures were carried out at atmospheric pressure. It was almost the entire amount of waste water evaporates. Only a small amount remained of dirty water, in which the remaining, not yet decomposed fixed ammonium salts have been enriched to a concentration of 30 to 40%.

It has been found that the formation of acidic vapors is essentially suppressed if the wastewater that has already been freed from the free ammonia is only then used wetted with the coke after it has already been pre-cooled. In this case it works it, as well as all fixed ammonium salts, without prior decomposition into noxious vapors to enrich in high concentration in the dirty water so that only about the 150th to 500th part of the waste water remains in liquid form. To the elimination also this residue by the usual method, be it by crystallizing out the salts, be it by treating the dirty water with lime and steam, no specialist can be embarrassed. The new method allows on the one hand the generation of to about 10 to 20 atmospheric pressure, highly superheated steam with a surprisingly low level Content of acidic components and thus its direct use, for example in steam engines or heat exchangers, or its return for regeneration the washing water containing free ammonia from gas cleaning.

The new method is characterized in that the glowing coke is pre-cooled with such steam that is used in the final extinguishing of the pre-cooled Coke with abortion wastewater was obtained.

The new method is illustrated, for example, on the basis of drawings from equipment used here explained in more detail.

Fig. 1 shows an elevation of the pressure vessel with inserted glow coke pots; Fig. 2 gives a scheme for the circuit to be provided for a coke oven battery Pressure vessels and steam accumulators again.

The pressure vessel 10 has such dimensions that three buckets 1 of a coke charge can be used one above the other with the inclusion of spacers 11 which are as close as possible.

In the second phase of the new process, the pressure vessel contains coke in the buckets 1 that has already been pre-cooled with steam. A sieve bottom is expediently attached to the upper intermediate piece 11, which can be charged with the ammonia stripper wastewater via the upper jacket nozzle 14, the suspended funnel 15 and the downpipe 16. The waste water is thereby evenly sprinkled over the glow coke bucket cross-section, while the steam generated on the still hot coke penetrates the sieve bottom 13 and the liquid layer on it from bottom to top and is freed of dust and liquid particles as it passes through the coke layer of the top bucket, finally through the upper jacket socket 17 emerges.

In the first phase of the new process, this steam obtained in this way is introduced into a second pressure vessel of the same type, which has previously been charged with the not yet pre-cooled coke, from below through the nozzle 18 and the perforated distribution ring pipe 19 and is severely overheated in the process. He then leaves this other pressure vessel through the pipe socket 17 for the purpose of using its energy content, for example in a low-pressure steam engine.

Here it has turned out to be important, the one won in this way superheated steam from around 10 to 20 atmospheres only down to around 2 atmospheres in the steam engine to relax, because in this case the formation of corrosive condensation water will certainly be avoided.

The new process can also be used in a single pressure vessel carry out if you get the in the second phase of the deletion process from the sewage temporarily in one with the help of the already pre-cooled coke obtained The steam accumulator collects and it is still used after the pressure vessel has been refilled coke not precooled again through the nozzle 18 for the purpose of overheating in the first Initiates phase of the deletion process again.

After completing the second deletion phase, the in the lower part of the Pressure vessel accumulates a small amount of dirty water, which contains the fixed ammonium salts contains in high concentration, drained through the nozzle 20 and before draining Purified into the sewer system in a known manner.

In FIG. 1, the pressure vessel is surrounded in a manner known per se with a jacket 21, in which pure water or a non-evaporating liquid is introduced at 22 and discharged as steam or hot liquid at 23 to prevent overheating and deformations to prevent the boiler plates.

A complete system using several pressure vessels and steam accumulators is explained below with reference to FIG. 2, for example.

For a coke oven battery, three pressure vessels 10 a to 10 c are used. A fourth boiler is expediently set up as a reserve. To bridge the time intervals between the coke batches, a storage device 25 for the high-pressure steam generated and, if necessary, a storage device 26 for the pure low-pressure steam which is obtained in the cooling jacket 21 and which is conducted via lines 39 are provided.

After a pressure vessel 10a has been charged with fresh glow coke tubs, steam is first introduced from the memory 25 at a pressure of about 15 atmospheres through the line 27 with the valve 28 and through the nozzle 18 from below. After it has passed through the glowing coke, it is drawn off through nozzle 17 and arrives via line 29, valve 30 and line 31 to a steam turbine (not shown) and then to the ammonia stripper.

After the next batch of coke has been introduced into the boiler 10 b , the steam supply is switched from the boiler 10 a to 10 b by closing the valve 28 and opening the valve 32. Accordingly, valve 30 is closed and valve 33 opened so that the steam from the boiler 10 b now passes through line 43 into the line 31 to the turbine. The changeover can be largely automated.

The boiler 10 a is then fed with ammonia stripper wastewater from line 35 with the valve 36 open through nozzle 14. With the valve 37 open, the resulting steam now passes through line 29 into the inlet port 38 to the storage device 25. The waste water admission to the boiler 10a is expediently set so that the coke is cold enough just before the next coke charge is connected after the pressure has been released, it can be lifted and brought onto the ramp.

The coke charge wetted with water is relaxed in the process expediently in such a way that the resulting steam bypassing the turbine directly is led to the abortionist. Only when a pressure of 1 to 2 atmospheres has been reached takes place further relaxation down to atmospheric pressure.

Until then, the vessel 10c is then filled with fresh Glühkokskübeln so and opening valve da.ß by closing valve 32 of the memory 40 on these steam boiler 10 may be converted c. Analogously, valve 33 is closed and valve 41 is opened, so that the turbine is now fed via boiler 10c and line 31.

Accordingly, the boiler 10 b is then charged with ammonia stripper wastewater from the line 35 by closing the valve 36 and opening the valve 42.

The resulting steam then arrives via the line 43 and valve 44 to the inlet connection 38 of the accumulator 25 after the valve 37 is closed and the valve 44 is opened.

In an analogous manner, the pressure vessel 10 c can also be charged with ammonia expeller wastewater in rotation via valve 45 and the resulting steam can be discharged via valve 46 into storage 25.

The essence of the invention is the selective evaporation of the water the residual liquors of the gas cleaning while largely avoiding decomposition of the It contains ammonia bound as salt, whereby the use of the palpable Heat of the glowing coke ejected from the coke ovens becomes completely possible and at the same time the reliable disposal of the harmful sewage in economical portable way becomes possible.

The use of the unusually small amount that accumulates under pressure Water gas is not excluded, but not the subject of the invention.

Claims (1)

PATENT CLAIM: Process for coke cooling with fixed ammonium salts Abort wastewater in pressure vessels at about 10 to 20 atm characterized in that the glowing coke is pre-cooled with such steam that at the final extinguishing of the pre-cooled coke with abortion wastewater became. Considered publications: German patent specifications No. 629 369, 531944, 426 342, 372 996, 339 878; French Patent No. 822 820; British U.S. Patent No. 329,751.