Anti-freezing LNG cold energy utilization strengthened heat transfer device

Abstract

The invention discloses an anti-freezing LNG cold energy utilization strengthened heat transfer device. The device comprises two parts of a tube side and a shell side; the tube side comprises an LNG inlet, a front tube sheet, a heat exchange tube bundle, a rear tube sheet and an LNG outlet which form a LNG process; the shell side comprises a refrigerant inlet, a shell and a refrigerant outlet which form a refrigerant process; the heat exchange tube bundle is located in a cavity defined by the front tube sheet, the rear tube sheet and the shell, and the two ends of the heat exchange tube bundleare fixed on the front tube sheet and the rear tube sheet in a penetrating manner; the heat exchange tube bundle comprises a plurality of spiral flat tubes which are arranged in parallel, the two ends of the spiral flat tubes are round tube sections, and the middles of the spiral flat tubes are spiral flat tube sections welded with porous fins at the exteriors; the outer side of the heat exchangetube bundle is bundled through a plurality of groups of steel strips; and refrigerant contains non-condensable gas. According to the device, the problem of refrigerant freezing in the LNG cold energyutilization process is effectively solved, and the device is good in strengthened heat transfer effect, high in safety, high in sensitivity, simple in manufacturing process and low in processing cost.

Description

technical field [0001] The invention relates to the field of utilization of LNG cold energy, in particular to a device for enhancing heat transfer of LNG cold energy utilization for preventing freezing blockage. Background technique [0002] Due to the advantages of high calorific value, less pollution, and abundant reserves, natural gas accounts for an increasing proportion of energy consumption. As one of the main storage and transportation methods of natural gas, the storage and transportation of liquefied natural gas (LNG) has obvious characteristics: convenient storage and transportation, the volume of LNG (-162°C) is only about 1 / 600 of the volume of natural gas at normal temperature; the value of LNG cold energy is huge, and LNG gasification Natural gas at room temperature will release about 830MJ / t of cold energy, and a unit of LNG cold energy can convert about 200kWh of electrical energy. At present, the cold energy utilization of LNG mainly includes cold energy po...

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problem of condensation during the heat exchange between the refrigerant and the LNG during the start-up and shutdown process and the fluctuation of the LNG load, and has large operating flexibility, sensitive response, high heat exchange efficiency, and safe and stable operation.

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