| 摘要 |
The invention relates to methods for carrying out heat-mass-exchange processes for a gas-liquid system, including air conditioning and drying, or purifying gases of impurities of other gases, liquid vapor and dispersed solid particles from a gas, and can be used in air conditioning systems, in the sanitary purification of gaseous emissions, and in treatment of natural or associated petroleum gases prior to the use or transport thereof (i.e. in drying or in the removal of higher hydrocarbons, hydrogen sulphide, carbon dioxide, etc.) The object of the present invention is to develop a simple, effective and reliable method for purifying gases of gaseous, liquid and solid impurities, to reduce materials consumption of equipment and to reduce operational costs. The essence of the invention is that the condensate previously formed from gas flow to be purified and cooled to a temperature lower than the dew point of the gas flow is used as a cold heat-transfer fluid, which is in direct contact with the gas flow, in the purification of gases, including the cooling of a gas flow, the formation of a condensate and the separation of said condensate, along with absorbed gaseous and mechanical impurities. A part of the previously obtained condensate, uncooled, is fed prior to the interaction of the gas to be separated and the cooled condensate, in order to saturate the gas phase by vapor, resulting in an increased amount of condensate on the liquid or solid particles, thus increasing separation efficiency. Gas purification is carried out in stages in order to separate an individual component or group of components of the gas phase at each stage. The advantages of the present invention are simplification of the gas purification process, reduction of energy consumption and metal consumption of process instrumentation, possibility of additional effective removal of solid impurities from gas, precise maintenance and automation of purification process parameters (i.e. the amount of vapors, dispersed gases and absorbed gases removed) by regulation of the temperature and amount of fed condensate, and also possibility of avoiding significant losses in gas flow pressure in the purification process by lowering the temperature of the gas by means of an external cooling source, rather than gas cooling by means of throttling thereof. |
