Porous precooling pipe and manufacturing method thereof

Abstract

The invention provides a porous precooling pipe and a manufacturing method thereof. The porous precooling pipe comprises a bent pipe, a liquid spray pipe and a baffle. One end of the bent pipe communicates with one end of the liquid spray pipe. The other end of the bent pipe is provided with a liquid inlet. The baffle is arranged on the end face of the other end of the liquid spray pipe. The area of a liquid outlet of the end of the liquid spray pipe is less than one-second of the circle area of an inner hole of the liquid spray pipe. A plurality of liquid spray holes are formed in a pipe body of the liquid spray pipe. The porous precooling pipe is formed by punching the liquid spray holes in a steel strip first and then rolling the steel strip. Burrs are avoided. The reliability of products is improved. The baffle blocks part of the end face of the liquid spray pipe. The flow velocity of cooling liquid in the precooling pipe can be increased. The liquid spray force of the liquid spray holes can be increased.

Description

technical field [0001] The invention relates to a porous pipe, in particular to a porous pre-cooling pipe and its manufacturing method. Background technique [0002] Natural gas and other gases need to be cryogenically liquefied in storage tanks for transportation. Storage tanks and pipelines are made of austenitic stainless steel. Austenitic stainless steel has excellent low-temperature performance, but has a large coefficient of linear expansion. For 304L material pipelines, when the working temperature is -162°C, the 100m pipeline shrinks by about 300mm. Although the compensation for cold shrinkage is considered in the design, when the temperature change rate is large, there are still problems such as excessive temperature change and excessive thermal stress, which may cause damage to materials or connection parts. This requires that before the cryogenic pipeline and equipment enter the cryogenic liquid, pre-cooling operation should be carried out first to ensure the sa...

AI Technical Summary

Problems solved by technology

What's more troublesome is that the drilling process produces a large number of burrs on the back of the hole and inside the pipe. Cleaning the inside of the 10-meter-long pipe is difficult to operate and cannot be cleaned.

The remaining burrs will enter the storage tank with the coolant and damage the valve bodies, burying safety hazards for storage tank transportation

In addition, the existing multi-hole pre-cooling tube has poor divergence of coolant injection. In order to improve cooling uniformity and cooling speed, more and denser small holes can only be processed, which increases the difficulty of production, and the effect is not ideal.

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