Three-adsorber air separation and purification device and method for double-coupled thermochemical heat storage system

Abstract

The invention discloses a three-adsorber air separation purification device based on a double-coupling thermochemical heat storage system and a method of the three-adsorber air separation purificationdevice. The air separation purification device comprises three molecular sieve adsorbers working in parallel, an electric heater, a thermal chemical reactor, a liquid storage device, a silencer, a control valve and the like. One side of the molecular sieve adsorbers is respectively connected with a waste nitrogen heating channel, a waste nitrogen cold blowing channel and an air outlet channel, and the other side of the molecular sieve adsorbers is respectively connected with an air inlet channel, a waste nitrogen emptying channel and a waste nitrogen waste heat recovery channel; the operationtime of the two sets of coupled thermochemical heat storage devices is coordinated; the deep recovery of the waste heat of cold blow polluted nitrogen can be realized; water vapor can be condensed when a refrigerant in a liquid storage device evaporates and refrigerates, the waste heat recovery efficiency is improved, and a gradient heating layout is formed in the preheating stage of regeneratedwaste nitrogen by utilizing the univariate characteristic of a chemical adsorption reaction, so that the preheating effect of the waste nitrogen is improved, and the air separation purification systemcan operate efficiently and stably in an energy-saving manner.

Description

technical field [0001] The invention relates to the field of molecular sieve design, in particular to design a three-adsorber air separation and purification device based on a double-coupled thermochemical heat storage system. Background technique [0002] In modern large-scale air separation plants, the air separation purification system is one of the key equipment for energy saving and consumption reduction. The desorption and regeneration of molecular sieve adsorber is an endothermic process. Generally, dirty nitrogen gas is used to heat up the heater and enter the molecular sieve adsorber for desorption and regeneration. In order to reach the working temperature of molecular sieve adsorption, it is necessary to blow with cold contaminated nitrogen after desorption to lower the temperature of the adsorber. In the conventional air separation and purification system, there are two molecular sieve adsorbers working in parallel. Due to the time difference, the heat contained...

AI Technical Summary

Problems solved by technology

In the conventional air separation and purification system, there are two molecular sieve adsorbers working in parallel. Due to the time difference, the heat contained in the cold blown nitrogen gas is difficult to use, and it is usually emptied directly, resulting in a large waste of energy.

The polluted nitrogen gas discharged from the cold blowing process has the characteristics of high temperature, high humidity and fluctuations, and there are great difficulties in recycling

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