DE1508083C3 - Process for the production of reducing gases for iron production - Google Patents

Description

3 4

Known fuels, the latter is limestone to be added to the gasification air. The inlet temperature of the

zen to the sulfur contained in the fuel gasification air is between 250 and 600 ° C,

tie (British Patent 895 085). useful at 350 ° C. The high preheating that

Finally, a method for gasifying the gasification air as it flows through the bed of crumbly slag lying with fine-grained or dusty fuels is known, in which a partial gasification at a low temperature and at a correspondingly high temperature in the vortex gate is first carried out in a Winkler Genera- bed with the favorable FoI resulting from it - then a combustion of the genera for the result of the gasification process,
The fine grain discharged from the gate can be carried out. It is advantageous to inject further gasification air into the generator shaft in the first process section, ie in the Winkler area of the fluidized bed, the temperature is deliberately kept low. This second addition of air is used to gasify fine coal, in order to soften the fuel ash, which is avoided by the gas flow. The residue of the second procedural fluidized bed is torn out. It is expediently incurred in the form of liquid ash. If the second air is preheated to a higher degree than in this known method, there is also the possibility of mixing in fine-grain mineral masses, which are blown into the bottom of the Winkler generator. air.

However, this is done for the

baking of the abandoned coal to avoid the method according to the invention

den, whereby the aim is, moreover, that this gas supply temperature of up to 1500 ⁰ C is attainable.

In the second stage of the process, beat the slag. This means that it has a relatively high temperature

facilitate kenschmelze. also for carrying out the gasification process

In contrast, the method according to the Er- has considerable advantages. Once the reaction

determination in such a way that coal ash and speed, which with the temperature after a

propose to form sintered products, which are related in small-grain exponential law

Shape, for example between approximately sand grain size 25 of the gasification at lower temperatures considerably

and walnut size. You sit on the Bo- enlarged, so that the throughput corresponds-

that of the generator and form a fixed rises. On the other hand, at high temperatures

Bed of loose crumb slag. These fixed temperatures more favorable equilibrium conditions and

lowing bed, which has a height of about 0.5 to 2 m, so that more advantageous gas analyzes can be achieved. This means-

30 tet at the lower end of the Winkler generator that the final carbon content in the gas produced

known discharge organs, such as snow dioxide and water vapor, are kept low,

ken, constantly removed from the generator. Do not exceed the above, for example 2 to 3%,

warmed gasification air od. The like. Can directly This is with regard to the intended use

Via the bottom of the Winkler generator in the solid of the gas produced as a reducing agent of great

A lying bed of crumb slag is blown in.

the. The air flows through this bed from below

to the top, here in the countercurrent heat output method according to the invention the advantage that in

exchange in the crumb slag is further preheated, the sulfur present in the fuel is bound and

while the latter is cooled to a temperature with kept out of the gas to be produced

which is about 50 ° C above the inlet temperature 40.

Claims (1)

1 2 be practiced, and in such an amount that they Claim: Ash melting point above the working temperature heights. Process for the production of reducing gas The use of a Winkler generator for sen for iron production by gasifying Fe- 5 gasification of solid fuels has been known for decades, carbon-containing fuels with air th. However, it did not appear possible, and / or other oxygen-containing gases, data a certain upper temperature limit within the by in that the Verga to exceed ₇ generator, otherwise the ashes of the solution in the fluidized bed (Winkler generator) intermediate to gasifying fuel melts. The Einhallchen 1000 ° C. mainly between 1300 and io tion of this upper temperature limit, however, has taken place to '1500 ⁰ C, with the fuels itself consequence that either the temperature of the known additives, such as limestone, lime and NEN gas for the reduction of Iron ore does not contain silica or alumina materials, is high enough or will give its composition, in such an amount that it does not meet the requirements. The latter can be caused by the ash melting point over the working 15, for example, by the fact that the gas increases too much temperature. Contains carbon dioxide or water. From these green the Winkler generator has not yet been used to produce reducing gas, although this generator is a particularly economical 20 allows gassing of carbonaceous substances, in particular with regard to the requirements to be placed on the input material. The teaching according to the invention gives the possibility The invention relates to a method for the production, in connection with the production of reducing gases for iron production by means of induction gases to avoid the disadvantages of the Winkler generator gasification of solid, carbonaceous fuels, although its advantages, in particular with air and / or other oxygen-containing gases with regard to the economic viability of the gasification process are preserved. So there is the possibility through the German patent specification 872 952 is a possibility to give the Winkler generator the gasifying process for the production of sponge iron by 30 fuel with a grain size, which is known in reducing iron ore by means of gases, available in large quantities is. So it is not necessary to first generate a reducing gas, which is expensive to achieve this grain size, the temperature of which is essentially that of the measures to be taken / Furthermore, the win reduction of the ore to sponge iron allows the use of larger products working temperature , preferably about 1000 ⁰ C, 35 tion units, about in the order of magnitude of. The reducing gas should be extracted from the 100,000m ³ / h, which also significantly improves the economy of the gasification device directly in the reducing process,
Facility directed and there with the ore in Beruh- There are still attempts to be made regarding the fermentation. The known process of fine coal in the Winkler generator has the disadvantage that it is relatively difficult to reach temperatures of up to 1350 ° C in the gasification area of the same and therefore less economical as a result. Here will ever be. This is particularly due to the fact that. but accepted that the ash particles to be gasified to be gasified chen crushed to dust and caked in the generator center, must be. The effort required for this is precisely this which should be an important cost factor through application of the teaching. Another 45 of the invention should be avoided. In addition, the disadvantage of the known method is, in connection with these known experiments, that it has also been proposed, using only relatively small production units, to obtain slag that is easier to remove by producing fine grains whose output is of the order of magnitude of total feed material with only a small proportion is roughly 20,000 m ³ / h. The invention is based on the object of avoiding moisture Working temperature is possible to process gases, the temperature of which is to increase with the. Otherwise, reducing the iron ore would also correspond to a costly pretreatment of the temperature, so that the immediate feed material containing carbon would be necessary,
guiding the reducing gas obtained into the production room. This desired ash melting point is known per se, if the economy is to be improved, for example, in connection with a process, the need to start with solid fuels for the production of fuel gas from carbonaceous matter, to start from dusty fuels (German Patent is avoided. Document 1 034 804). To solve this problem, however, the invention proposes such as lime, silica, alumina, etc., added that the gasification in a fluidized bed (Winkler-Geden, to lower the melting temperature of the ash) between 1000 ⁰ C, mainly between 65 put. In the method according to the invention, the 1300 and 1500 ° C should take place, whereby the fuels are added to increase the ash melting, on the other hand, additives known per se, such as limestone, lime and point. It is also related to materials containing silica and alumina, in addition to the gasification of solid, carbonaceous materials