Air separation waste heat and material comprehensive utilization system

Abstract

The invention relates to an air separation waste heat and material comprehensive utilization system, comprising an air filter connected in sequence, an air compressor, a cooling tower, a lithium bromide refrigerator and a heat pump are arranged side by side between the air compressor and the cooling tower, and the heat pump and the lithium bromide refrigeration The second outlet of the lithium bromide refrigerator is connected to the lower part of the cooling tower, the first outlet of the lithium bromide refrigerator is connected to the first inlet of the low-temperature circulating water cooler through the third solenoid valve, the first outlet of the lithium bromide refrigerator is connected to the cooling tower There is a fifth solenoid valve between the upper part, the lower part of the cooling tower is connected to the 32°C circulating water countercurrent device, and the upper part is connected to the 7℃ low temperature circulating water countercurrent device. The compressed air at 120°C at the outlet of the air compressor enters the heat pump and the lithium bromide refrigerator respectively to produce steam or hot water and 5°C-12°C low-temperature circulating water for steam or hot water users, the upper section of the cooling tower and other low-temperature plants in the plant. It is used by cold users, and at the same time, the temperature of compressed air is reduced to 80°C while producing heat or cooling, which realizes the comprehensive utilization of waste heat.

Description

technical field [0001] The invention relates to the field of waste heat and material comprehensive utilization, in particular to an air separation waste heat and material comprehensive utilization system. Background technique [0002] Such as figure 1 Shown is a schematic diagram of the existing air separation waste heat cooling structure. The air is filtered by the air filter 1 and enters the air compressor 2. After being compressed, the air temperature rises to 120°C and enters the lower part of the cooling tower 3. The compressed air is rising. In the lower packing of the cooling tower 3, it is in countercurrent contact with the circulating water at 32°C from the circulating water system to wash away impurities such as dust in the compressed air and initially reduce the temperature, and the compressed air coming out of the lower packing continues to the cooling tower The upper part of 3 moves, and contacts with 7°C low-temperature circulating water in the upper section o...

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Problems solved by technology

[0004] 1. The compressed air at 120°C at the outlet of the air compressor 2 directly enters the cooling tower 3, and the waste heat of this part of the compressed air is not squeezed and utilized;

[0005] 2. Compressed air at 120°C directly enters the cooling tower 3 to be washed and cooled, and the cooling tower 3 is cooled down to 10°C. The cooling is mainly realized by circulating water and low-temperature circulating water, which consume a lot of water;

[0006] 3. The polluted nitrogen from the effluent cooling tower 4 is directly discharged to the atmosphere, and the comprehensive utilization of materials has not been realized

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