Multi-metal tube heat tracing composite tube for radioactive fluid conveying

Abstract

The invention belongs to the technical field of radioactive fluid conveying, and particularly relates to a multi-metal tube heat tracing composite tube for radioactive fluid conveying. The multi-metaltube heat tracing composite tube comprises a cylindrical central heating body and at least three metal tubes, wherein the metal tubes are tightly attached to the outer side of the central heating body through a wrapping fixing layer and evenly arranged in the circumferential direction, and the axis of each metal tube is parallel to the axis of the central heating body; an anti-radiation layer forresisting ray radiation is arranged at the periphery of the wrapping fixing layer; a first thermocouple and a second thermocouple are arranged at the contact position between two adjacent metal tubes, wherein the first thermocouple is arranged between the central heating body and the metal tubes, and the second thermocouple is arranged between the wrapping fixing layer and the metal tubes; a third thermocouple is arranged in one metal tube; a spiral heating body is wound around the periphery of the anti-radiation layer; and the multi-metal tube heat tracing composite tube further comprises aninsulating protective layer covering the periphery of the spiral heating body. According to the heat tracing composite tube, multiple radioactive fluids can be conveyed, the heating temperature of multiple metal tubes can be accurately controlled, and the temperature distribution of the whole heat tracing composite tube is uniform.

Description

technical field [0001] The invention belongs to the technical field of radioactive fluid transportation, and in particular relates to a multi-metal tube heat tracing composite pipe used for radioactive fluid transportation. Background technique [0002] In power plants, metallurgy, aerospace, petroleum, chemical and environmental protection and other industries, heat tracing composite pipes of metal pipes and non-metal pipes are used in fluid process control and monitoring, pipeline insulation and antifreeze, sampling and analysis. [0003] Chinese Utility Model Patent Application No. 200610016775.3 discloses a continuous reinforced composite pipe for oil recovery in oilfields and its production process. The plastic inner pipe is used as the skeleton, and two steel wire ropes and three cables are symmetrically distributed between the protective layer and the cladding layer; Metal pipes in the oil production system are prone to wax sticking, serious corrosion and low efficien...

AI Technical Summary

Problems solved by technology

[0010] The heated pipes of the above-mentioned heat-tracing composite pipes are all non-metallic pipes, and most of the disclosed heat-tracing composite pipe products are also heated by non-metallic pipes; Or multiple heating elements are arranged outside the pipe along the axial direction of the non-metallic pipe or wound outside the pipe. Although they have the function of heat tracing and heat preservation, they are all self-limiting temperature tracing or constant power tracing. The heating temperature is low and cannot be precisely controlled. , and the temperature distribution in the circumferential direction of the entire heating composite pipe is uneven and (or) the temperature of multiple non-metallic pipes in the heating composite pipe is uneven

Very few publicly disclosed heating composite pipe products are heated pipes as metal pipes (stainless steel pipes, copper pipes), the number of metal pipes is one or two, and one or more heating elements are arranged outside or outside the metal pipe along the axial direction. Arranged together with the pipe material along the circumferential direction of the center of the heat tracing pipe, but the temperature distribution of the entire heat tracing composite pipe is uneven and (or) the temperature of the multiple metal pipes in the heat tracing composite pipe is uneven, and the heating temperature cannot be accurately controlled; and The number of metal pipes in the heat tracing pipe is small, sometimes it cannot meet the requirements of the number of use

More importantly, none of the disclosed heat tracing composite pipe products have the function of shielding radioactive rays in transporting radioactive fluids, and some materials used have poor resistance to radioactive rays, which cannot meet the requirements for the use of radioactive fluids transporting heat tracing

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