Device for preparing nitrogen and control method thereof

Abstract

The invention provides a device for preparing nitrogen. The device comprises an air compressor, a filter, a dryer, a separator and an air storage, wherein the air compressor, the filter, the dryer, the separator and the air storage are sequentially connected; the filter comprises a liquid filter body and a dust filter body; the device further comprises a voltage stabilizer and a pressure sensor. The voltage stabilizer is communicated with the separator through a first loop; a second loop is further arranged on the first loop; the first loop is provided with a first control valve; the second loop is provided with a second control valve; the pressure sensor is respectively arranged on the separator and the first loop. By means of the technical scheme, the production efficiency of preparing nitrogen can be effectively improved, and the influence of pressure floating on stabilization of the device is prevented; the nitrogen preparing device can be simplified, the flow-path plugging condition is reduced; the safety production efficiency is improved, the volume is also relatively small, and disassembling and repairing are convenient.

Description

technical field [0001] The invention belongs to the technical field of producing nitrogen, and in particular relates to a device for producing nitrogen and a control method thereof. Background technique [0002] Existing nitrogen production devices generally use high-quality carbon molecular sieves as adsorbents, and use the principle of pressure swing adsorption to directly obtain nitrogen from compressed air; under a certain pressure, due to dynamic effects, the diffusion rate of oxygen and nitrogen on carbon molecular sieves The difference is large. In a short period of time, oxygen molecules are adsorbed by carbon molecular sieves, and nitrogen molecules are enriched in the gas phase to achieve the separation of oxygen and nitrogen. However, since the carbon molecular sieve layer’s oxygen adsorption capacity varies significantly with pressure, reducing the pressure can desorb the oxygen molecules adsorbed by the carbon molecular sieve, so that the carbon molecular sieve ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies, and propose a device for producing nitrogen, aiming at solving the problem of unstable pressure in existing nitrogen production devices

Images