SU857238A1 - Method of producing technological gas - Google Patents

Description

(54) METHOD FOR OBTAINING TECHNOLOGICAL GAS

one

The invention relates to the industrial production of hydrogen-containing gases by gasifying solid pulverized fuels, in particular to a method for producing process gas, and can be used in the production of synthesis gas in the chemical industry, fuel gas in the energy sector, hydrogen as a reducing gas in the metallurgy and as an energy carrier for energy transfer to a large distance.

The known method of gasification of solid fuel with steam, in which, due to burning, blowing air into the stationary layer of fuel, it is heated, and then, when it is blown with steam, it is gasified to produce a hydrogen-containing gas 1.

The disadvantages of this method are low productivity, frequency of the process and, as a consequence, high cost of the product obtained.

The closest in technical essence and the achieved result to the proposed method is the method of producing process gas by means of the long-stage gasification of solid fuel in the presence of water vapor of oxygen-containing gas 2.

The main disadvantages of this method are the relatively low degree of gasification and the speed of the process, as well as the complex technology of ash ash.

The purpose of the invention is to increase the degree of gasification, speeding up the process and simplifying the ash removal technology.

Claims (4)

fQ The goal is achieved by the fact that in the method of producing process gas containing hydrogen and carbon monoxide, including the gasification of solid fuel in the presence of water vapor and high-temperature heat carrier at a temperature of 1500-2500 K, the supply of unreacted fuel to re-gasification in the presence of an oxidizing agent in which the ash-enriched fuel from the second stage of the process is burned in the presence of an acidic 2Q genus-containing gas in the third stage, with the separation of the resulting ash and gas mixture containing two carbon monoxide and at last vozvrttom second gasification stage, wherein at each of the stages of the process take one of the reactants in excess to the other otnoshe1shyu. In addition, solid fuel at the first stage of gasification is taken in excess with respect to stoichiometry by the reaction of interaction of the fuel with water vapor, and the oxidizer is deficient with respect to the stoichiometry of the reaction of its interaction with the fuel from the second stage. At the same time, fuel enriched with ash is jigged with an excess of oxygen-containing gas and a temperature below the ash evaporation temperature, and a part of the process gas heated to the initial process temperature is used as the high-temperature heat carrier. . The method is carried out as follows. The coal coal in the amount of 1 kg at a temperature of 293 K is fed for gasification into the vertical; high-temperature zone of the reactor, to which a mixture of steam with a part of the process gas in the amount of 4.9 composition, kg: СО3.35 Na0.2 HZ О0.95 С020.4 at a temperature of 2300 K and pressure atm Coal is simultaneously supplied at an excess of relation to steam and COi according to Boudoir reactions and reactions of interaction with water vapor. Coal dust in the stream is gasified and the process gas of composition is obtained at the reactor exit, kg: CO5 Na0.35 At 00.05 СОz0.05 and 0.35 kg coal at 1500 K. The degree of gasification in the first stage is 65%. 30% of the obtained process gas is removed from the mash (the obtained target product is reduced in its heat by heating water in the heat mixer. The remaining 70% of the process gas is returned to the preheated stage as 2300 K as the high-temperature heat carrier. 0.35 kg of unreacted coal served on the second stage of gasification, into which the products of combustion are supplied from the third stage at a temperature of 1400 K of composition, kg: CO-0.22 Oj0.17 N21.07 Accept coal ash - 10%, the gasification process is carried out with an excess of oxidant at a 0.5. Semi The resulting gasification products at a temperature of 1800 K and composition, kg: N21.07 CO0.58 are fed further to air combustion in a high-temperature superheater (Kauner) to superheat steam and recycle process gas to the initial process temperature of 2300 K. Unburnt part of the fragrance is 0 , 16 kg (0.1 kg is ash) is fed to the third stage for complete afterburning, to which the air is fed in an amount of 1.4 kg at a temperature of 1400 K. The combustion process takes place with an excess of oxidizing agent 2. The proposed method allows to simplify the output technology.ols, so as a regulator of; the quantity and temperature of the oxidant supplied to the third stage can always burn ash enriched fuel at temperatures,; below the evaporation temperature of the ash. In addition, in the proposed method, a complete gasification of 100% can be achieved as compared to 95% by a known method, and it also allows for an increase in the speed of the process. Claim 1. Method of producing a process gas containing hydrogen and carbon monoxide, including gasification of solid fuel in the presence of water vapor and high-temperature heat transfer fluid at a temperature of 1500-2500 K. The supply of unreacted fuel to re-gasification in the presence of an oxidizing agent, the purpose of increasing gasification completeness, increasing the speed of the process and simplifying the technology of ash removal, the fuel enriched with ash from the second stage of the process is burned in the presence of acid gas containing gas on the third stage, with separation of the formed ash and gas mixture containing carbon dioxide and return of the latter to the second stage of gasification, with each and: 3 stages of the process taking one of the reactants in excess with respect to the others. 2. A method according to claim 1, characterized in that the solid fuel at the first stage of gasification is taken in excess with respect to stoichiometry by reacting the interaction of the fuel with water vapor, and the oxidizer is lacking with respect to the stoichiometry of the reaction of its interaction with the fuel from the second stage . 3. Method according to paragraphs. 1 and 2, characterized in that the enriched in ash fuel is burned with an excess of oxygen containing 5 8572384 gas and TeNoieparype below the temperature of the vapor-Sources of information no ash. taken into account during the examination 4. The method according to paragraphs. 1, 2, and 3, of which there is a high-quality quality. Patent of Germany No. 87S558, cl. C 01 J 3/46, Routine heat transfer fluids use part-j publication. 1953. preheated to the initial process temperature2. US patent No. 4026679, CL. 48-73 process gas.public. 1974 (prototype).