Wide-range temperature adjusting heat exchange device for copious cooling treatment of methane

Abstract

The invention discloses a wide-range temperature adjusting heat exchange device for copious cooling treatment of methane. The wide-range temperature adjusting heat exchange device for copious coolingtreatment of the methane comprises a heat preservation box, a methane pipeline and a low-temperature nitrogen ejector, the methane pipeline is arranged in the heat preservation box, the exterior of the heat preservation box is provided with an inlet and outlet connector, and the nitrogen ejector is used for ejecting low-temperature nitrogen downwards from the top of the heat preservation box to exchange heat with the methane pipeline. Compared with the prior art, the nitrogen flow is controlled by adopting a flow adjusting valve, wide-range adjusting of the methane copious cooling treatment temperature is achieved, and the heat exchange device has the advantages of being simple in structure, easy to manufacture and low in cost.

Description

technical field [0001] The invention belongs to the technical field of methane cryogenic treatment, and relates to a methane cryogenic device, in particular to a wide-range temperature regulating heat exchange device for methane cryogenic treatment. Background technique [0002] After the liquefied natural gas or liquefied methane is supplied to the system, the temperature will rise (may be gasified), so that the user's temperature requirements cannot be met. Most of the existing technologies are related to the liquefaction technology in the process of natural gas preparation, but there are few technologies related to the cryogenic treatment of methane. CN105953525A discloses a method for cooling natural gas with liquid nitrogen. Although a relatively ideal cooling effect can be obtained, there is a fatal shortcoming: because the boiling point of liquid nitrogen is lower than the freezing point of methane, if the flow of liquid nitrogen is not properly controlled, methane is...

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Problems solved by technology

[0003] The technical solution of the present invention is to provide a wide-range temperature-adjusting heat exchange device for methane cryogenic treatment in view of the deficiencies of the prior art, which solves the problem that methane may freeze when liquid nitrogen directly cools methane. The liquid nitrogen flow rate is limited, so that the cooling temperature range of natural gas will not be very wide; the liquid nitrogen pipeline has poor thermal insulation; the cooling and the cooled medium are controlled in an open loop, and the precision is poor, and remote automatic control cannot be realized; the cooling and the cooled pipeline are fixed. In the connected state, if the two types of pipelines are made of different materials or not cooled synchronously, they are likely to be damaged under low temperature stress, and the problem of poor low temperature adaptability has a good use value

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