Device and method for lowering comprehensive power unit consumption of air separation unit

Abstract

The invention relates to an air separation unit for cryogenic separation technique, and aims to provide a device and method for lowering comprehensive power unit consumption of an air separation unit. According to the method, a waste heat recovery device is utilized to use compression heat recovered from all sets in the air separation unit to prepare chilled water, and the chilled water is utilized to cool and dehumidify inlet media of all the sets by using a heat exchanger; and meanwhile, the heat exchange quantity of the heat exchanger is adjusted by using a controller, thereby implementing control on temperature and humidity of the inlet media of all the sets, keeping the inlet media of all the sets in the optimal gas state, and achieving the goal of lowering the comprehensive power unit consumption of the air separation unit. When the invention is utilized to lower the temperature and humidity of inlet air of the compressor, the project experience shows that the temperature of inlet air of the compressor is lowered by 5%, and the power consumption of the compressor is reduced by 5%.Meanwhile, under the condition of definite compressor power, the temperature of the inlet air is lowered by 5 DEG C, and the compressed medium air quantity is increased by 1%.

Description

technical field [0001] The invention relates to a device and a method for reducing the comprehensive unit power consumption of air separation equipment. More specifically, it is aimed at equipment for air separation using a cryogenic separation process. Background technique [0002] Air separation equipment is widely used in metallurgy, petroleum, chemical industry, electronics, glass and machinery and other industrial sectors. Oxygen, nitrogen and rare gas products have become indispensable "power" products for the national economy. With the continuous development of large petrochemical, large chemical fertilizer, large coal chemical industry and large metallurgical industries, my country has become one of the countries with the most air separation equipment projects and the most active development of air separation technology in the world. The future prospects of industrial gases are broad. [0003] The air separation unit is a device used to separate the various componen...

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Problems solved by technology

At present, the compression of the air separation unit has the following two problems: (1) Since the design and selection of various compressors take the hottest working condition, the coldest working condition, and the average working condition, in some inlet air temperature and humidity conditions (2) The difference between the design parameters and the actual operating parameters, large horse-drawn carts are common in air separation units, resulting in low annual average system operating efficiency high

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