Primary heat-regeneration multi-flow heat exchange device for low-temperature liquid nitrogen

Abstract

The invention belongs to the technical field of synthesis ammonia low-temperature liquid nitrogen processing equipment, and relates to the technology of a primary heat-regeneration multi-flow heat exchange device for low-temperature liquid nitrogen. Secondary refrigerating plant outlet -66.3 DEG C, 1.77MPaH2, -66.3 DEG C, 5.10MPaN2-H mixed gas and -66.3 DEG C, 0.13 MPaN2-Ar-CO-CH4 waste nitrogen cooling from 42 DEG C, 5.9MPaN2 to -63.3 DEG C, 5.8MPa in the low-temperature liquid nitrogen process are used, namely, secondary refrigerating plant outlet N2-H2 mixed gas, high-pressure H2, and waste nitrogen cooling capacity regenerative cooling incoming flow high pressure N2 are used for providing -63.3 DEG C nitrogen temperature conditions for a secondary refrigerating plant. Based on the multi-flow tube nest low-temperature heat exchange technology, spacer sleeves are used for controlling the distance between tube nests, and the side tube plate technology is used for achieving free contraction of tube bundles. The primary heat-regeneration multi-flow heat exchange device for the low-temperature liquid nitrogen is compact in structure, high in heat exchange efficiency and capable of being used in the field of 42 DEG C to -66.3 DEG C gas low-temperature multi-flow heat exchange, solves the technical problem of the primary refrigeration technology of the low-temperature liquid nitrogen, and improves the low-temperature heat-regeneration heat exchange efficiency of a low-temperature liquid nitrogen process system.

Description

technical field [0001] The invention is mainly applied in the technical field of low-temperature liquid nitrogen process equipment for synthetic ammonia, and relates to the technology of primary recuperation multi-stream heat exchange equipment for low-temperature liquid nitrogen. 2 , -66.3°C, 5.10MPaN 2 —H 2 Mixed gas and -66.3℃, 0.13MPa N 2 —A r —CO—CH 4 Contaminated nitrogen cooling 42°C, 5.9MPa N 2 To -63.3°C, 5.8MPa, that is, the N at the outlet of the secondary refrigeration device 2 —H 2 Syngas, high pressure H 2 And the cooling capacity of contaminated nitrogen is reheated and cooled to flow high-pressure N 2 , to provide temperature conditions for the secondary refrigeration device; it uses fixed-distance sleeves to control the spacing of the tubes and side-mounted tube-plate technology to achieve low-temperature free contraction multi-stream tube-type low-temperature heat exchange technology, compact structure, high heat transfer efficiency, It can be used i...

AI Technical Summary

Problems solved by technology

First of all, most of the current low-temperature liquid nitrogen washing process systems adopt the overall heat exchange method, which connects the three-stage refrigeration process as a whole. The height of the heat exchanger can reach 60-80 meters, and the heat exchange efficiency has been significantly improved. The thermal process is too complicated, and the volume of heat exchange equipment is too large, which brings serious inconvenience to processing, manufacturing, on-site installation and transportation, and once there are problems such as pipeline leakage, it is difficult to detect, and it is easy to cause the entire heat exchanger to be scrapped and the complete set of process equipment to stop production , and the present invention solves LN from the three-stage heat exchange equipment 2 Start with the problem of pre-cooling and liquefaction, and focus on solving the low-temperature heat transfer problem of a refrigeration unit

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