Freezing expansion type chlorine liquefying method

Abstract

The invention discloses a freezing expansion type chlorine liquefying method. A conventional chlorine liquefying device can explode or pollute the environment easily. An output end of a turbine type chlorine compression unit is connected with an input end of a main gas-liquid separator through a pressurization brake fan, a brake cooler, a precooler and a main chlorine liquefier; an output end of the main gas-liquid separator is connected with an input end of an auxiliary gas-liquid separator through an auxiliary chlorine liquefier; and an output end of the auxiliary chlorine liquefier is connected with an input end of a tail chlorine distribution platform through an expansion machine, a second cooling pipe and a third cooling pipe. The method specifically comprises the steps as follows: the turbine type chlorine compression unit and the pressurization brake fan pressurize a chlorine raw material; the brake cooler, the precooler and the main chlorine liquefier cool chlorine; the main gas-liquid separator separates a gas-liquid mixture; the auxiliary chlorine liquefier performs secondary cooling of the chlorine; and the auxiliary gas-liquid separator performs secondary separation of the gas-liquid mixture. The freezing expansion type chlorine liquefying 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 a freeze-expansion 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-...

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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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