DE833189C - Process for producing high quality coke by mixing feed coal with coke breeze - Google Patents

Description

:() On page a of the description there are in! 69 behind (a little word »Ntahlgute:« the following 1 \ 'places has been inserted: dal3 at no time in the gap between (part \ lahlwal-relt a quality: tligeliütlft is. 1 »The l'atentallairuelt 3! Did the following l @ a @@ uuh obtain: Process ruin \ lahleu N-ou Koksgrus after Ailalruch a profiled by means of smooth oller Zweiwalreu-Brechxverke, thereby kellnreich- liet. (1a13 the Umfaligsge #, ch \\ - iii (ligl; eit der \ I: ilil \\ alreil so greetings @@: illlt is called the rate of fall of the (part Walren supplied good ;, (1a13 To none Point in time in the gap between (part Mahlwallell hurried Gutuiellge is heaped up. Process for producing high-quality coke by mixing feed coal with coke breeze When processing raw coke (crushing and sieving), apart from the crushed coke types I to IV, the grain size of coke breeze is 10 to 0 mm; the amount of 10 to 0 mm grain produced depends on the quality of the raw coke and the intensity of the crushing process. While with normal raw coke with a crushing roller distance of go mm, which results in about 5% of crushing IV, 15010 crushing III, 35% crushing II and 40% crushing I, an attack of about 5% can be expected, the amount of crushing increases up to to about 15 0/0 as soon as the yield of crushed coke III has to be brought to 59% by adjusting the rollers more closely. Since the crushed coke types I to III achieve the same prices and the green coke price is less than half of the crushed coke types, the crushing of the type III, which is most sought after in house firing, is rejected by the coke producers as uneconomical. The coke producers have tried to use the coke bog in their own operation as boiler firing or as a lean agent for too rich, too gas-rich or for driving coals, but the boiler firing requirements are relatively low, and the possibility of adding coke burs to the coals of the coke ovens was generally on the order of magnitude limited by 5%. Additions of coke breeze over 504, especially when they came in the order of 15 to 2a0 / 9, resulted in a completely inadequate, soft and crumbly coke when normal fat or gas coal was used as the feed.

A process has also become known that works well for mixtures For baking charcoals with such a lower baking ability, add a coke to produce slightly more than 5% coke breeze, which meets the requirements set by the consumer, z. B. with regard to drum strength, . nt corresponds. In this procedure However, it is a special case that cannot be generalized and which requires tests based on the selected mixture before it is carried out, to determine the amount of coke bog allowed for the required conditions. At low Changes to the individual components in quality and quantity, for example, decrease Drum strength immediately decreases significantly. This procedure is also about the stage the attempts did not get out.

According to the invention a method is proposed that is practical for Occurring cases there is a rule that, on the one hand, the admixture is much higher Amounts of coke breeze permitted, on the other hand, if there are changes in the mixing ratio, none The result is a decrease in the quality of the coke. The process consists in that the coke breeze intimately in a manner known per se with the coal ground to a suitable grain size mixed and then subjected to a further processing, which is essentially consists in that the pores of the coke breeze with coal particles by suitable means filled and / or glued.

In the further development of the process, the one intended for admixture should be used Coke burrs are processed in such a way that it is ground to the appropriate grain size which depends on the pore size of the raw coke used. Through the painting the pores of the individual coke grains for the reception of the coal grains are largely opened. The grinding can be done with any moisture content.

Around the pores of the coke particles with the optimal largest amount of coal To fill, it is in itself not indifferent how the grinding of the coke breeze is done will. For this purpose, two conditions must be met: When grinding First, the pore edges of the broken coke should be largely preserved, so that the carbon grains are as large, irregular and jagged pore surfaces as possible each pore found. Second, it should be prevented from getting stuck during milling of the coke fill the pores with finely ground coke dust. With the so far however, these conditions become common methods for grinding the coke not or only imperfectly fulfilled. The known ball or rod mills are used for this purpose is used, the grist remains in the grinder housing for far too long and is affected by the Grinding media constantly ground so that not only the jagged breaking edges of the granules be sanded down, but also by the constant cluttering of the Grinding media is already pulverized coke powder into the pores.

Therefore, according to the invention, the processing of the coke breeze is carried out another 1tahlverfahren proposed.

In order to meet the above two conditions, zti must Time to break each ko @ riles be limited to the utmost. This will achieved through the use of the known two-roll crusher with smooth or profiled rollers, the peripheral speed of which, however, is increased in this way. because it is greater than the speed of fall of the one falling between the 1 \, 'alzen Grist. Through this measure, every good particle is removed from the grinding rollers by the torn out the incoming flow of material, splintered in a fraction of a second and thrown off before the following particle is caught by the rollers. the momentary fragmentation causes further abrasion of the fracture surfaces and the resulting pores cannot be filled with coke dust. These The previously known roller disc mechanisms did not have a property because of their speeds or peripheral speeds were so low that in the gap between the Rollers amassed a good amount. This also led to constant disruptions in the crushing process, so that such \ 'alzwerke also rejected because of their inadequate efficiency became. However, due to the instantaneous crushing action of the rolling mills according to the invention not only the desired protection of the broken goods, but also a great deal Operational reliability and incomparably higher performance without a noticeable increase the power consumption achieved.

The new method allows using normal fat or Gas coals, individually or in a mixture, have an addition of 10, 1.5, 20 or more percent of coke breeze with a simultaneous improvement in the coke quality compared to the results when using coal alone as a charge. When coking the in the pores of the Coke burrs embedded coal particles distort such a firm connection of coke breeze and newly produced coke that 110c11 additions of 30% coke breeze are possible are kaliti without the inclusion of grus being subsequently ascertained. There with the procedure at the same time a significant increase in resistance to falls and the strength of the drum, naturally falls even with the strongest breaking only a small amount of 10 to 0 mm grain, so that with continued use the process produces an optimal value for the amount of grust and coke quality. It is then possible to use the raw coke produced to a greater extent, yes, It is necessary to completely break it up in crushed coke ITT and the coke breeze that arises in the process to add the charge coal again and thus turn it to lump or \ v. Crushed coke to wrap. This practically equates to the price of Breclikok for the coke breeze: achieved after deduction of the processing: - or process operating costs. Because the latter in total are only around half the price per tonne of added coke breeze, when the method according to the invention is used, depending on the freight situation, a Considerable additional revenue per ton of coke breeze that arises or that is added.

In addition to the economic use of the coke breeze under simultaneous Increase in The process according to the invention still has coke quality the advantage that due to the homogeneous and uniform incorporation of coke particles in the charcoal during the coking in the oven in the cake a porous Scaffolding forms through which the byproducts (gases and condensates) can pass through the cake can be removed more easily. From the fact that also through the coke breeze in the resulting coke cake is no longer exposed to shrinkage Framework is inserted, it follows that the resulting coke cake after fermentation the chamber completely fills up to the ceiling and no longer, as with the use of coal alone, badly slumped. By staying full, the resulting gases have and condensates, the shortest route from the coal or coke cake to reach the gas outlets and are not, as when using coal alone, as a feedstock the damaging and corrosive influence of the highly heated but exposed bare chamber walls; so thereby the decomposition of the gases and Prevents vapors and thus achieves a higher yield or a higher calorific value.

The filling of the edge pores of the coke grains with coal particles can be done in various ways, for example by applying pressure, hydraulically, electrically or by a combination of these means. Using pressure, the mixed feed can e.g. B. between rollers with smooth, profiled or troughed outer surfaces pressed or between Surfaces are rubbed. The coal is flooded in by hydraulic means into the pores of the coke possible, whereby of course the water content of the coal feed must be taken into account. By electrostatic charging of the coke and coal particles such an attraction of the two particles can be achieved that the precondition for the intimate incorporation of the particles into one another is achieved. PATENT CLAIM: r. Process for producing high quality coke by mixing feed coal with Coke breeze, characterized in that the edge pores of the coke breeze using by mechanical pressure, by pressing between smooth or profiled rollers, by rubbing under pressure, by precoating by hydraulic means, by electrostatic means Charging of the individual coal and coke parts by combining the individual means or otherwise filled with the finest coal particles and / or stuck together.

2. The method according to claim r, characterized in that the coke breeze is processed to the greatest possible opening of the marginal pores by grinding.

3. A method for grinding coke breeze according to claim 2 by means of smooth or profiled rolling mills, characterized in that the peripheral speed the rotating rollers is greater than the falling speed of the feed material.