Energy-saving air separation cooling system and method

Abstract

The invention relates to the technical field of intelligent air separation equipment, and particularly relates to an energy-saving air separation cooling system and method. The system comprises an AIcontrol subsystem, a molecular sieve subsystem, a cooling rectifying tower, a liquid nitrogen storage device, a cooling capacity exchange subsystem, an indoor water tank, a heat exchanger and a gas storage device; the liquid nitrogen storage device is used for controlling liquid nitrogen to flow into and out of a liquid nitrogen pipe group, the indoor water tank is used for controlling water to flow into and out of a cooling water pipe, and the heat exchanger is used for controlling water to exchange heat with nitrogen flowing out of the liquid nitrogen pipe group after flowing out of the indoor water tank and before flowing into the cooling water pipe; the AI control subsystem comprises a data storage device, a statistical device and a controller. According to the energy-saving air separation cooling system and the method, the AI control subsystem is used for determining the number of groups of liquid nitrogen flowing through the liquid nitrogen pipes in the cooling rectifying tower according to the expected gas production rate, so that the input amount of the liquid nitrogen is accurately and intelligently controlled, energy waste caused by excessive input of the liquid nitrogenis avoided, energy consumption is reduced, the labor cost is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of intelligent air separation equipment, in particular to an energy-saving air separation cooling system and method. Background technique [0002] The air separation industry is a green and environmental protection industry, with a small footprint, no pollution to the environment, and in line with national industrial policies. The air separation project is actually a process of separating oxygen, nitrogen, argon and other gases in the air with high purity through a set of large-scale air separation system equipment, and the pure oxygen, pure nitrogen and other gas products separated by air separation equipment , It can be used in many fields such as metallurgy, chemical industry, photovoltaic industry, polysilicon, magnetic materials, electronic semiconductors, medical treatment, food and so on. The main components in the air are oxygen, nitrogen, argon, carbon dioxide and some water vapor and impurities. T...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide an energy-saving air separation cooling system and method to solve the problem that the cooling capacity of the liquid nitrogen liquefied air in the cooling rectification tower cannot be accurately controlled when the air separation equipment in the prior art is used for air separation. , resulting in the technical problems of excessive input of liquid nitrogen and large energy loss

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