A liquid nitrogen freezer and processing method for vertical compartmental freezing

Abstract

The invention relates to a liquid nitrogen freezing apparatus adopting vertical partitioning and a using method, which are applicable to the technical field of artificial freezing in the underground engineering. The liquid nitrogen freezing apparatus comprises a freezing pipe which is of a columnar structure; a freezing pipe base cone is arranged at the bottom of the freezing pipe; a liquid supplypipe is arranged in the freezing pipe; a plurality of liquid spraying holes are formed on the side wall of the liquid supply pipe; the bottom of the liquid supply pipe is sealed and a small liquid spraying hole is formed at the bottom of the liquid supply pipe; a gas outlet pipe is arranged at one side of the liquid supply pipe; freezing pipe inner chutes matched with rib plates in number and position are formed on the inner wall of the freezing pipe; the vertical rib plate is arranged between each freezing pipe inner chute and the outer wall of the liquid supply pipe; the rib plates are adjustable in width size; a position of the liquid supply pipe in the freezing pipe can be accurately controlled; liquid nitrogen sprayed from the liquid spraying holes is independently gasified among therib plates; freezing effects at different positions can be controlled by regulating a liquid spraying amount, so that a development range of frozen soil in different directions outside the freezing pipe is accurately controlled; and the liquid nitrogen freezing apparatus fulfills the aims of improving freezing quality, saving the use amount of the liquid nitrogen, reducing freezing time and controlling frost-heave capacity, and is simple to produce and good in processing property.

Description

technical field [0001] The invention relates to a liquid nitrogen freezer for freezing in vertical bins and a processing method, and is especially suitable for a liquid nitrogen freezer for freezing in vertical bins used in the technical field of artificial freezing in underground engineering. Background technique [0002] The artificial freezing method uses artificial refrigeration technology to freeze the water in the formation, turn the natural rock and soil into frozen soil, increase its strength and stability, and isolate the connection between groundwater and underground engineering, so that construction can be carried out under the protection of the frozen wall. There are two commonly used freezing methods, one is brine freezing and the other is liquid nitrogen freezing. Both methods have their own advantages and disadvantages. Liquid nitrogen quick freezing is often used in emergency construction. Using liquid nitrogen as a refrigerant can achieve a low temperature t...

AI Technical Summary

Problems solved by technology

Due to the small size of the liquid supply pipe inside the freezing pipe, the position inside the freezing pipe cannot be accurately controlled, so it is difficult to control the distribution of liquid nitrogen inside the freezing pipe and the gasification process, and the development of the frozen soil around the freezing pipe cannot be precisely controlled, resulting in liquid The uniformity of the frozen wall formed by nitrogen freezing is poor

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