Variable multi-cycle oxygen and nitrogen cold energy utilization device and method for recovering oxygen and nitrogen resources

Abstract

The invention discloses a variable multi-cycle oxygen and nitrogen cold energy utilization device and method for recovering oxygen and nitrogen resources. High-quality cold energy of oxygen and nitrogen low-temperature liquid serves as a medium, efficient recycling of the oxygen and nitrogen resources is achieved in a cyclic utilization mode, meanwhile, a new way is provided for a rapid emergency peak regulation mode of an air separation system, the oxygen and nitrogen diffusion rate is greatly reduced, and the oxygen and nitrogen utilization cost is effectively promoted to be remarkably reduced. The defect that liquid oxygen is heated by steam to be vaporized for emergency guarantee traditionally is overcome, the system has the advantages that cold energy is recycled and steam consumption is reduced, liquid oxygen and liquid nitrogen products can be selectively converted according to market requirements, and better economic benefits are achieved. In addition, according to the characteristics of users, different recycling scales can be configured, and the optimal economic benefits are achieved.

Description

technical field [0001] The invention belongs to the advanced energy-saving field of an air separation system, and in particular relates to a variable multi-cycle oxygen-nitrogen cold energy utilization device and method for recovering oxygen and nitrogen resources. Background technique [0002] The large-scale air separation technology adopting the deep cryogenic freezing method is the main way to produce oxygen and nitrogen products on a large scale in modern industrialization. This process has the advantages of rich products, low comprehensive energy consumption, and stable performance. It also has the disadvantages that it cannot be started and stopped at any time, and the load changes Due to the shortcomings of small range, long start-up time, and complicated system operation, it is especially suitable for long-term and stable supply of oxygen and nitrogen products. [0003] However, in the actual production process, in the large-scale chemical industry, steel and non-fe...

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Problems solved by technology

[0006] In view of the problems in the prior art, the present invention provides a variable multi-cycle oxygen and nitrogen cold energy utilization device and method for recovering oxygen and nitrogen resources, aiming to solve the economical problem of recycling when oxygen is temporarily released on a large scale, and simultaneously considers the recovery During normal operation, problems such as the release caused by the mismatch of compressed nitrogen, deviation from the best design conditions, difficulty in coordination, and frequent start and stop of nitrogen compressor equipment, etc., achieve the purpose of efficient and low-cost recovery of all oxygen and nitrogen release resources, and provide a new Air separation load adjustment mode, thereby reducing the overall energy consumption of the air separation system

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