Single-compression twin-supercharging double-expansion high-purity nitrogen preparing device

Abstract

The invention belongs to the technical field of nitrogen manufacturing, and relates to a single-compression twin-supercharging double-expansion high-purity nitrogen preparing device. According to the device, two booster expansion turbines are additionally arranged on a universal nitrogen preparing device, an inlet and outlet pipeline of an original supercharger is provided with an inlet valve and an outlet valve, a pipeline for nitrogen and liquid nitrogen to go out of a rectifying tower is provided with a pressure regulation valve, high-purity nitrogen obtained at the top of the rectifying tower outputs high-purity nitrogen outwards after passing a main heat exchanger or a main heat exchanger and the supercharger, and the high-purity nitrogen passes a liquid nitrogen subcooler and then is outwards outputted. The device has the advantages that refrigerating capacity is controlled through the two valves on a ventilation pipeline at the top of a stored liquid separation tank, production of the liquid nitrogen can be controlled, stronger refrigerating capacity can be achieved through a twin-supercharging double-expansion system, extra nitrogen is converted into the liquid nitrogen, the aim that production of the nitrogen and the liquid nitrogen is adjustable is achieved, supercharging of the nitrogen is driven through expansion of dirty nitrogen exhausted from the tower, energy consumption is low, and the device is suitable for production of the nitrogen and the liquid nitrogen which are low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of nitrogen production, in particular to a high-purity nitrogen production device with single compression, double boost and double expansion. Background technique [0002] With the rapid development of various industries such as electronics, metallurgy, medicine, chemical industry, new material industry and petrochemical industry, the demand for nitrogen products is increasing. The air separation equipment for nitrogen production is a large energy-consuming. It consumes a lot of energy, so how to effectively reduce energy consumption is very important. At present, the general practice is to expand part of the flow and throttle the rest. The power output of the expander is boosted by the fan brake to vent; the liquid air is not too cold or only has a simple heat exchange with part of the fluid, and the equipment is not flexible to adjust and solidify, resulting in insufficient products or Surplus emptying wa...

AI Technical Summary

Problems solved by technology

At present, the general practice is to expand part of the flow and throttle the rest. The power output of the expander is boosted by the fan brake to vent; the liquid air is not too cold or only has a simple heat exchange with part of the fluid, and the equipment is not flexible to adjust and solidify, resulting in insufficient products or Surplus emptying waste, using these methods and process organization, the high energy consumption of air separation equipment cannot meet the requirements of users

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