SU659071A3 - Method of obtaining gases - Google Patents

Description

one

The invention relates to methods for producing gases and may find application in technological processes for producing hydrogen.

A method of producing gases containing hydrogen and carbon monoxide is known by incompletely burning hydrocarbons, followed by purifying the hot gas by passing through a cyclone, saturating the gas with water, and washing in the foam layer at 30-40 ° C.

The disadvantages of this method are the complexity of the technological design of the process, as well as the presence of a large amount of wastewater.

Closest to the proposed invention is a method of producing gases containing hydrogen and / or carbon monoxide, including incomplete combustion of hydrocarbons, cooling the products of combustion to a temperature not lower than 200-210 ° C and purifying them from solid particles in a cyclone, and then water washing in scrubbers 2 .

However, with this method, ash particles trapped in water are removed from the process in the form of an aqueous suspension of ash, which, due to the impossibility of disposal, has to be discharged into industrial drains, polluting the environment.

The purpose of the invention is to reduce the amount of wastewater and the possibility of simultaneous purification from gaseous impurities.

This is achieved by a method of producing gases containing hydrogen and / or carbon monoxide, including the incomplete combustion of hydrocarbons, cooling the combustion products to a temperature not lower than 200-210 ° C and purifying them from solid particles in a cyclone,

and then water washing, in which the water washing is carried out at a temperature equal to at least the dew point of the gas, and the aqueous suspension obtained at this stage is divided into two streams in a volume ratio of 1: 5-20, the largest of which return to the washing stage, and the smaller one to the pelvic cooling stage.

Claims (2)

The proposed method makes it possible to minimize the amount of wastewater from 20 because under these conditions, part of the wash water is returned to the raw gas. completely evaporated and the resulting dry ash particles are cleaned in a cyclone, without forming a suspension of ash. In addition, this method allows you to simultaneously purify the gas from the impurities of sulfur compounds and hydrogen cyanide, reducing their content from 110 to 12-20 mg / m, i.e., 10 times. Example. In the plant, the oil is converted into gas in a reactor using oxygen produced in the product stream of raw gas in the amount of 3 X 10 normal cubic meters per day. Temperature 1400 ° C, pressure 30 bar. Crude gas contains 3 wt.% Carbon black. Gaseous impurities are present in an amount of 110 mg / normal m. These impurities consist mainly of sulfur compounds — HjS, COS, and traces of HCN. The raw gas is cooled to 250 ° C in an indirect heat exchanger. The evaporator brings the temperature of the gas stream to 180 ° C. The cyclone removes carbon black in an amount of about 90%. The remaining soot is removed in a washer. The incoming water flow after the cooler (heater) has a temperature of 180 ° C. In the state of the scientific research institute of equilibrium, the stream contains 100 ° / n of soot entering with the gas stream. The gas stream contains more gas impurities along with water vapor, resulting in a flow of water of 25-210 tons / day. This water contains almost all gas impurities. The gas stream is a purified gas product, free from soot, with a gas impurity content of not more than 12 mg / normal m, and the water stream is cleaned with steam in a stripping column. The output water flow of about 210 tons / day contains no more than 5 mg / kg of impurities, the gas flow of 28-130 tons / day contains 2-20 mg / kg of gaseous impurities, with almost all of the impurities present in the raw gas product. The gas stream is in contact with the sulfinol to remove the sulfur compounds, and the remaining traces of HCN are completely oxidized by the air in the incinerator. Claims method for producing gases containing hydrogen and / or carbon monoxide, including incomplete combustion of hydrocarbons, cooling of the combustion products to a temperature not lower than 200-210 ° C and cleaning them from solid particles in a cyclone, and then water washing, characterized in that In order to reduce the amount of wastewater and simultaneously remove any gaseous impurities, the water washing is carried out at a temperature equal to at least the dew point of the gas, and the aqueous suspension obtained at this stage is divided into two streams 1: 5–20, the larger of which is returned to the washing stage, and the smaller one to the gas cooling stage. Sources of information taken into account during the examination 1. USSR author's certificate oNb 183188, cl. B 01 D 45/12, 06.12.62. 2. Uzhov V.N. and Mgkov B.I. Cleaning of industrial gases by filters. 1970, p. 234-236.