On-line leak plugging method for shell and tube heat exchanger

Abstract

The invention relates to an online leakage stopping method for a tube type heat exchanger. According to the method, round steel with the outer diameter smaller than the inner diameter of a heat exchange pipe is selected, and the two ends of the round steel are each turned to form an external thread; then the round steel penetrates the heat exchange pipe at the position of leakage from a pipe plate on one side and stretches out of a pipe plate on the other side; the positions, stretching out the pipe plates on the two sides, of the two end heads of the round steel are each provided with a nut; an annular sealing gasket is arranged between each nut and the outer plate face of each pipe plate; a sealing material is wound between an internal thread of each nut and the corresponding external thread of the round steel; and the nuts at the two ends are screwed, and are made to closely press and abut against the outer plate faces of the pipe plates through the sealing gaskets, and then leakage elimination can be achieved. According to the method, the system shutdown is not needed, the inner leakage of the heat exchanger can be eliminated as long as the pipe pass can be isolated, and the accident that shutdown of a whole factory is caused by leakage of one device is avoided. Besides, fire operation is not needed, and the method can be adopted for eliminating leakage points whether shell pass media are flammable and combustible media or not.

Description

technical field [0001] The invention belongs to the technical field of maintenance of tube-and-tube heat exchangers, and in particular relates to an online plugging method for tube-and-tube heat exchangers. Background technique [0002] For the tube-and-tube heat exchanger, when the weld between the tube sheet and the heat exchange tube leaks, it is generally used to repair the weld between the tube sheet and the heat exchange tube or to seal the heat exchange tube by welding. However, for the shell-and-tube heat exchanger in the production system of the nitrogen fertilizer plant, since the production system of the nitrogen fertilizer plant is still in operation, the methanol in the shell side cannot be isolated and replaced, so methanol continuously flows out from the leakage of the tube sheet, and due to the It is a flammable and explosive liquid, so welding cannot be used to eliminate leaks. [0003] Another common leak-elimination method to deal with heat exchanger tube...

AI Technical Summary

Problems solved by technology

This method can only reduce leakage but cannot completely eliminate leaks; and this method cannot be used when the tube side pressure is high, because the force of the tube side medium on the cylinder may be greater than the friction between the cylinder and the tube sheet, resulting in Failure to eliminate leaks may cause safety accidents in severe cases

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