Air separation system rectified nitrogen liquifying system
An air separation system and nitrogen technology, applied in the field of air separation, can solve the problems of high cooling capacity, low system stability, and high system energy consumption, and achieve the effects of high purity, safe operation, and reduced operating energy consumption.
Inactive Publication Date: 2019-06-14
湖北浠水蓝天联合气体有限公司
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[0003] The purpose of the present invention is to solve the problems that the existing nitrogen liquefaction system needs more cooling capacity during operation, the energy consumption of the whole system is relatively high, and the stability of the system operation is not high. Nitrogen liquefaction system
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[0016] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or an optional connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.
[0017] see figure 1 , the present embodiment comprises air compressor 2, booster turbo expander 6, main heat exchanger 9, cold box 10, the inlet of air compressor 2 is connected to the nitrogen outlet of the rectifying tower of air separation system by pipeline, and air compression The outlet of the machine 2 is c...
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The invention relates to the technical field of air separation, in particular to an air separation system rectified nitrogen liquifying system. The system comprises an air compressor, a booster expansion turbine, a main heat exchanger and an ice chest. An outlet of the air compressor is connected with a boosting end of the booster expansion turbine. The system further comprises a pre-cooler. Nitrogen exhausted out of the boosting end is subjected to primary cooling through the main heat exchanger and then subjected to secondary cooling thorough the pre-cooler, the nitrogen flowing out of the pre-cooler returns to the main heat exchanger again for tertiary cooling, part of the nitrogen subjected to tertiary cooling enters an expanding end of the booster expansion turbine, expanded nitrogenreturns to the interior of the main heat exchanger to serve as a cold source of the main heat exchanger, and the cold source subjected to heat exchanging returns to the air compressor after being converged with nitrogen exhausted out of a rectifying column; and the other part of the nitrogen subjected to tertiary cooling enters the ice chest to be liquified into the product liquid nitrogen, and part of nitrogen which is not liquified returns to the ice chest and the main heat exchanger in sequence, and then returns to the air compressor after cold energy is recovered. The air separation systemrectified nitrogen liquifying system provided by the invention is lower in operating energy consumption and more stable in operation, and the product purity is better guaranteed.
Description
technical field [0001] The invention relates to the technical field of air separation, in particular to a nitrogen liquefaction system after rectification in an air separation system. Background technique [0002] At present, the nitrogen produced by the all-liquid air separation unit is collected after being processed by a special liquefaction system to increase the output of liquid nitrogen. The existing nitrogen liquefaction system mainly includes a booster turbo expander, a main heat exchanger, and a cold box. Through various equipment, cooling and liquefaction are realized through heat exchange. The existing nitrogen liquefaction system requires more cooling capacity during operation, the energy consumption of the entire system is relatively high, and the stability of the system operation is not high. Contents of the invention [0003] The purpose of the present invention is to solve the problems that the existing nitrogen liquefaction system needs more cooling capaci...
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IPC IPC(8): F25J3/04
Inventor 王景平姚细俊刘维芳
Owner 湖北浠水蓝天联合气体有限公司