Expansion type chlorine liquefying method

Abstract

The invention discloses an expansion type chlorine liquefying method. A conventional chlorine liquefying device explodes and pollutes the environment easily. An output end of a turbine type chlorine compressor unit is connected with one end of a first cooling pipe through a pressurization braking fan; the other end of the first cooling pipe is connected with an input end of a precooler and an input end of a main expansion machine; an output end of the precooler is connected with an input end of a gas-liquid separator through a chlorine liquefier; an output end of the gas-liquid separator is connected with a tail chlorine distribution table through an tail chlorine expansion machine, a second cooling pipe and a third cooling pipe; and an output end of the main expansion machine is connected with an input end of the turbine type chlorine compressor unit through a fourth cooling pipe and a fifth cooling pipe. The method specifically comprises the steps as follows: the turbine type chlorine compressor unit and the tail chlorine distribution table pressurize raw material chlorine; a brake cooler, the precooler and the chlorine liquefier cool chlorine; and the gas-liquid separator separates a gas-liquid mixture. The method is safe, energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an expansion type chlorine gas liquefaction method. Background technique [0002] At present, there are three commonly used methods for producing liquid chlorine in industrial production: the low-temperature and low-pressure method, the medium-temperature and medium-pressure method, and the high-temperature and high-pressure method. The safety degree of producing liquid chlorine in production decreases with the increase of pressure, but the energy consumption decreases accordingly. The cooling capacity required by the first two methods is provided by a refrigerator, and its refrigerants include liquid ammonia and Freon. The former is indirectly cooled by calcium chloride brine, but when liquid ammonia leaks into the system, nitrogen trichloride will be produced and when it accumulates to a certain level, it will easily decompose and explode. The latter is a direct-c...

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Problems solved by technology

The former is indirectly cooled by calcium chloride brine, but when liquid ammonia leaks into the system, nitrogen trichloride will be produced and when it accumulates to a certain level, it is easy to decompose and explode

The latter is a direct-cooling type, which is more energy-saving, but Freon will be banned globally in a few years, and production has been restricted at present, because Freon will destroy the ozone layer and cause harm to the living environment of the earth's organisms

The pressurization methods of the latter two methods mostly use sulfuric acid liquid ring compressors, the products are easily polluted by sulfuric acid, and the efficiency of liquid ring compressors is only 30%-40%, which reduces the energy saving effect

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