Device and method for determining regeneration cycle of air separation and purification system

Abstract

The present invention provides a device and method for determining the regeneration cycle of an air separation and purification system. The device comprises a molecular sieve adsorber, a fixed base, an inlet and outlet valve, a gas pipe, a connecting hose, a limiting device, a supporting platform, and a weight testing sensor. In an adsorption process, after water, carbon dioxide, and hydrocarbonsin the air are adsorbed by the molecular sieve adsorber, the state of the molecular sieve adsorber changes from a dry state to a saturated state, and the weight of the molecular sieve adsorber increases from m to m+ deltam; in a regeneration process, after the water, carbon dioxide, and hydrocarbons in the molecular sieve adsorber are brought away by high-temperature waste nitrogen and low-temperature waste nitrogen that successively pass through the molecular sieve adsorber, the state of molecular sieve adsorber changes from the saturated state to a dry state, and the weight of molecular sieve adsorber recovers from m+deltam to m; the weight change time of the molecular sieve adsorber in the adsorption process and the weight change time of the molecular sieve adsorber in the regenerationprocess are measured and recorded by a weight test sensor, and a longer time is selected as the regeneration cycle of the purification system. The method is simple in principle and can accurately determine the regeneration cycle of a molecular sieve, effectively save energy, and reduce the power consumption of air separation.

Description

technical field [0001] The invention relates to the technical field of absorption and regeneration of an air separation and purification system, in particular to a device and a method for determining the regeneration period of an air separation and purification system by using a "weighing method". Background technique [0002] In recent years, with the rapid development of coal chemical industry, metallurgical industry, petroleum industry and other enterprises, the demand for oxygen, nitrogen and argon is increasing day by day, and the number of extra large air separation units is increasing. As the unit with the highest energy consumption in these industries, air separation has always been an important topic to optimize its operation and save energy and reduce consumption. [0003] At present, molecular sieves are generally used in large and medium-sized air separation purification systems to absorb moisture, carbon dioxide, and hydrocarbons in the air. Molecular sieves pla...

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Problems solved by technology

[0004] The working cycle of molecular sieves in almost all purification systems in air separation units is to absorb and regenerate according to the preset adsorption time, hot purge time and cold purge time, which does not consider the adsorption results of molecular sieves in the previous cycle. , and the regeneration process without considering factors such as the flow rate and temperature of the current purge nitrogen will inevitably lead to useless work of part of the energy

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