Novel liquid air-separating device and novel liquid air-separating process

Abstract

The invention discloses a novel liquid air-separating device. The novel liquid air-separating device comprises a rectifying tower (1), the rectifying tower (1) comprises an upper tower body (10), a lower tower body (11) and a main condensing evaporator (12), one channel of a product nitrogen outlet of the upper tower body (10) is sequentially connected with a main heat exchanger (3) and a product nitrogen output pipe, and another channel of the product nitrogen outlet of the upper tower body (10) is sequentially connected with a liquefied heat exchanger (6), a circulating nitrogen compressor (5), a boosting end of a boosting expansion machine (8), a booster aftercooler (9), the liquefied heat exchanger (6), a low-temperature air conditioning unit (7) and the liquefied heat exchanger (6). The novel liquid air-separating device has the advantages that the device is organically combined with air-separating rectification and heat exchange devices, and accordingly device investment is reduced, and yield and purity of liquid products are guaranteed; product liquid oxygen quantity can be decreased or increased by increasing or decreasing product liquid nitrogen extraction quantity, and oxygen yield is increased or decreased; and continuous production and variable-load production of the device are achieved, energy consumption is lowered, and product quality is stable and guaranteed.

Description

technical field [0001] The invention relates to the technical field of air separation, in particular to a novel liquid air separation device and process. Background technique [0002] At present, many small cryogenic gas air separation plants have the characteristics of fluctuating gas consumption due to seasons, day and night, and even different time periods. The average daily oxygen release is relatively large, resulting in low operating efficiency of the plant and low unit energy consumption. High, high cost. In order to save energy consumption, reduce operating costs, and increase corporate profitability, air separation plants are usually equipped with liquefaction devices to liquefy excess oxygen and nitrogen into liquid oxygen and liquid nitrogen for external sales. The equipped liquefaction device is an external liquefaction device, which has the problems of poor capacity of variable load, high energy consumption, and difficult control of product purity, especially n...

AI Technical Summary

Problems solved by technology

However, the equipped liquefaction device is an external liquefaction device, which has the problems of poor load changing capacity, high energy consumption, and difficult control of product purity, especially nitrogen purity.

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