SU1024013A3 - Method of gasifying coal with low calorific power - Google Patents

Abstract

Process for the continuous gasification of solids or liquids, contg. carbon and/or hydrocarbons, in a reactor contg. a bath of molten iron, the novelty being that the reactants, (a) the carbonaceous solids or liqs., and (b) oxygen or media contg. oxygen, are blown into the bath by one or more tuyeres located in the reactor below the free surface of the bath in a refractory lining and which therefore wear way at the same rate. Materials (a) are pref. coal and/or heavy oil, whereas material (b) is pref. oxygen, surrounded by a protective medium of, or contg., gaseous or liq. hydrocarbonds. The reactants are pref. fed simultaneously together with any finely-powdered slag-making materials via the tuyere(s), or they may be added separately. Used for prodn. of redn. gas fed to a blast furnace for mfg. crude iron from iron ore, where the use of the redn. gas results in a substantial saving of the amt. of coke required.

Description

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The invention relates to the processing of coal, in particular to a method for gasifying coal with a low calorific value. There is a method of gasification of coal with a low calorific value capable of thu Cl. The disadvantage of the known method is that the resulting reducing gas is contaminated with carbon monoxide and water vapor, since oxygen and water vapor are introduced to maintain the required gasification temperature. An increase in the amount of oxygen supplied for temperature control cannot be used, since for obtaining the target product, consisting mainly of CO and H2 and having as small an amount of CO as possible, the ratio of coal to oxygen determined by | Leno. With the known method, there is no such limitation, since due to the third reagent (water vapor), as a target product, not only COF is also CO-, and CO and bottom pairs are stolen. The purpose of the invention is to increase the purity of the resulting reducing gas. This goal is achieved by the fact that according to the method of gasification of low calorific coal, including the introduction of yr l and oxygen-containing gas into the iron melt and removal of the resulting reducing gas, additional energy-rich coal, non-bonded carbon, aluminum, silicon, and carbide are introduced into the melt calcium and mixtures thereof. Coal and additional reagent can be introduced separately into the iron melt. In addition, before entering the melt, coal and / or additional reagent can be heated. p 1. For production At 100 thousand gas a reactor with a capacity of 80 m is used, made in the form of a converter and containing a melt of iron weighing 60 tons. The bottom of the reactor is equipped with three nozzles consisting of four concentric tubes. 0 t of coal dust with a calorific value of 132,600 kcal / kg together with 500 kg of coal dust with a calorific value of 7500 kcal / kg per ton of coal with a low calorific value are hourly fed into the reactor through the central nozzle pipe. 5000 nm / h of natural gas are used as carrier gas. At the same time through the first annular gap of the nozzle around the center tube serves 30 thousand nm / h of natural gas. The resulting reducing gas consists of 75 CO and 25% H. EXAMPLE 2 Example 1 is repeated with the difference that 00 kg of calcium carbide per ton of coal with a low calorific value is used as an additional reagent. At the same time, coal and calcium carbide are separately fed to the melt. A reducing gas is obtained consisting of CO and 25 N. Example 3. Example 1 is repeated, with the difference that 150 kg of fumed silica per ton of coal with a low calorific value are used as an additional reagent. A reducing gas is obtained, consisting of 75 CO 25 N. For example. Example 1 is repeated, with the difference that 150 kg of aluminum per ton of coal with low calorific value is used as an additional reagent. A reducing gas consisting of 75% CO 25 Hj is obtained. EXAMPLE 5 Example 1 is repeated, with the difference that 600 kg of carbon in the form of coke dust per tonne coal with a low calorific value is used as an additional reagent. A reducing gas consisting of 75% CO and 25% H is obtained. P R I M E R 6, Example 1 is repeated with the difference that 80 kg of silicon per ton of coal with a low calorific value and 70 kg of aluminum a ton of coal with a low calorific value. A remanufactured gas consisting of 75% CO and a solid 25% N / g is obtained. EXAMPLE 7 Example 1 is repeated. The difference is that 00 kg of calcium carbide per ton of coal is used as the additional reagent: 300 kg of carbon in the form of coke oven.

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dust. The reducing gas is reduced to CO. Aluminum, silicon consisting of 75 CO and 25% N. and calcium carbide are converted to oxides.

The additional reagent introduced by such materials has the advantages of molten iron, burns, coal with, that they are slag high calorific value of the formations.

and are absorbed by the donkey. Using

Claims (3)

1. METHOD OF COAL GASIFICATION WITH A LOW THERMAL CAPACITY, which includes introducing carbon and oxygen-containing gas into the molten iron and removing the resulting reducing gas, characterized in that, in order to increase the purity of the resulting reducing gas, an additional reagent from the energy-rich range is introduced into the melt. coal, unbound carbon, aluminum, silicon, calcium carbide and mixtures thereof. 2. The method of pop. 1, I am distinguished by the fact that coal and an additional reagent are introduced separately. 3. The method according to π. 1 and the fact that the coal and / or additional reagent is heated before entering the melt. d