Liquid nitrogen gasifying device for pipe purging

Abstract

The invention discloses a liquid nitrogen gasifying device for combustible gas or combustible liquid pipe purging. The device comprises a frame, and a liquid nitrogen storage tank, a pipeline system,a low-temperature plunger pump, a gasifying machine, a fan, a diesel generator and the like mounted in the frame; the diesel generator guarantees supply of electric power to the device under powerlessenvironment; the pipeline system comprises a gas-phase pipeline, a liquid inlet / outlet pipeline and a nitrogen outlet pipe; the low-temperature plunger pump extracts liquid nitrogen from the liquid nitrogen storage tank, and sends the liquid nitrogen into the gasifying machine by the liquid inlet / outlet pipeline; the gasifying machine is in an empty bath form; the fan intensifies the heat exchange effect; and gasified nitrogen is output for pipe purging after being heated by a resistance heating strip wound on the nitrogen outlet pipe. The device integrates such functions as storage, gasification, heating and control of the liquid nitrogen, is compact in structure, can be placed on a motor vehicle, is convenient to transport and apply, meets the requirement of high use level of purging nitrogen, and can be used under powerless environment.

Description

technical field [0001] The invention belongs to the application field of liquefied nitrogen, and provides a liquid nitrogen gasification device used for purging during maintenance and repair of combustible gas or combustible liquid pipelines. Background technique [0002] With the development of industrial technology, pipeline applications have gradually penetrated into every corner of society, especially in industrial applications. In oil refining, chemical, petroleum and other industries, pipeline transportation has become the main equipment for production and transportation. Especially for the transportation of flammable gases or liquids, the operation status of the pipeline directly affects the safety of production and use, and in order to prevent major accidents, these pipelines require special personnel for maintenance and repair. However, for these flammable gas or flammable liquid delivery pipelines, it is necessary to blow out the flammable gas or flammable liquid ...

AI Technical Summary

Problems solved by technology

However, for these flammable gas or flammable liquid pipelines, it is necessary to blow out the flammable gas or flammable liquid in the pipeline during maintenance, otherwise fire and explosion accidents will occur, causing heavy losses

[0003] There are many ways to purge combustible gas or flammable liquid pipelines, such as steam purge, water replacement purge, compressed air purge, inert gas purge, etc. Under the environment, the purging of the pipeline has become a difficult problem, resulting in high cost of purging

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