RU2024285C1 - Method for cleaning gas of acid components - Google Patents

Abstract

FIELD: gas cleaning from acid components in oil, gas and chemical industries. SUBSTANCE: gas flow is separated in two flows. Main flow is passed through zone of preliminary cleaning, then, through zone of fine cleaning and withdrawn from the absorber top. Absorbent flow is separated in two flows. First flow is mixed in emulsifier with additional flow of gas and zone of preliminary cleaning is filled with produced gas-fluid emulsion. Second flow of absorbent is fed to zone of fine cleaning. When gas is cleaned of CO₂ with water, the process efficiency amounts to 30 m³/h with water consumption of 200 l/h cleaning efficiency of 68% at initial content of CO₂ equalling 1 vol.%. EFFECT: higher efficiency. 1 dwg, 1 tbl

Description

 The invention relates to the purification of gases from acidic components and will find application in the oil and gas and chemical industries.

 Known methods of gas purification by introducing into the absorber the absorbent and the gas to be purified [1].

 The disadvantage of these methods is the impossibility of fine purification of gas from acidic components with a significant content of them in the gas.

 The closest technical solution is a method of purifying gases from acidic components, comprising introducing into the absorber two streams of absorbent material (upper and lower) and a stream of gas to be purified [1] - a prototype.

 The known method allows for fine purification of gas from acidic components due to the formation in the absorber of two cleaning zones (coarse and fine), however, the effectiveness of this method is insufficient at high loads.

 The aim of the invention is to increase the productivity of the process and the degree of purification.

 This goal is achieved by the fact that when implementing the known method of gas purification, the lower absorbent stream is pre-mixed with a portion of the gas to be purified until a gas-liquid emulsion is formed.

 The invention consists in the following.

 In the process of gas purification from acidic components by introducing into the absorber two flows (lower and upper) of the absorbent, two cleaning zones are formed in the absorber: the upper - fine cleaning and the lower - preliminary rough cleaning. Moreover, in the rough cleaning zone, the lower absorbent stream, as well as in the upper zone, is distributed over the nozzle or on the plates and, flowing down, interacts with the gas in the usual counterflow mode. As a result of the fact that the absorbent flows down in rather large droplets and streams, a significant part of it does not react with the gas and is removed from the absorber, and the performance of the absorber cannot be increased.

 The authors found that if the lower flow of the absorbent is introduced into the absorber in the form of a gas-liquid emulsion, after mixing the absorbent with gas before the formation of the emulsion, then by increasing the contact surface of the phases, the quality of cleaning increases sharply, therefore, with the same quality of cleaning, the productivity of the absorber can be increased.

 Comparison of the claimed technical solution with the prototype allows us to establish compliance with its criterion of "novelty." When studying the known technical solutions in this technical field, the features that distinguish the claimed invention from the prototype were not identified and therefore they provide the claimed technical solution with the criterion of "Significant differences".

 The drawing shows a method of gas purification.

 In the process of gas purification, before entering the purification zone, the absorbent of the lower stream 1 in the emulsifier 2 is mixed with a part of the gas to be purified 3, taken from the main gas stream 4. Mixing is carried out until a gas-liquid emulsion is formed, which is introduced into the rough cleaning zone 5 of the absorber 6.

 The following is an example of a specific implementation of the proposed method.

Laboratory tests of the proposed method and the prototype method were carried out on an absorber model consisting of a glass pipe (150 mm, 1000 mm high) with 7 glass sieve plates fixed inside the pipe. A highly turbulent flow with gas filling> 90% was used as an emulsifier. Absorbent (water) was introduced into the upper part of the model (the pipe is located vertically) and purified gas was removed from it. The lower absorbent stream and the gas to be purified were introduced into the lower part of the pipe, and the spent absorbent was removed. When testing the inventive method, an emulsifier (turbulizer) was installed between the tube of the lower absorbent stream, its entrance into the tube and the pipe branch from the tube with a stream of gas to be purified (air with a CO ₂ content of 1%).

 The results of comparative tests are shown in the table.

 As can be seen from the table, the inventive method provides an increase in the efficiency of gas purification.

 The economic effect is created by increasing the productivity and degree of gas purification and will amount to 100-150 thousand rubles. in year.

Claims (1)

 METHOD FOR CLEANING GAS FROM ACID COMPONENTS, including supplying a gas stream to the lower part of the absorber, passing it through a pre-treatment zone located in the lower part of the absorber, then through a fine-cleaning zone located in the upper part of the absorber, removing purified gas from the top of the absorber, and separating the stream absorbent in two streams with the supply of the first stream to the pre-treatment zone and the second stream to the fine cleaning zone, the output of the spent absorbent, characterized in that, in order to increase the productivity of ECCA and purity, was separated from the partial gas stream of purified gas feed stream, and a zone filled with the gas-liquid prefilter emulsion prepared in an emulsifier at a pre-mixing the first stream and the absorbent partial gas flow.

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