Anti-abrasive device for heat exchange tube bundle in trichlorosilane synthetic furnace

Abstract

The invention relates to an anti-abrasive device for a heat exchange tube bundle in a trichlorosilane synthetic furnace. The anti-abrasive device comprises a synthetic furnace heat exchange tube bundle composed of an inner ring heat exchange tube bundle, a middle ring heat exchange tube bundle and an outer ring heat exchange tube bundle, wherein an outer fixing ring is arranged on the outer side of the outer ring heat exchange tube bundle; a middle fixing ring is arranged on the outer side of the middle ring heat exchange tube bundle; an inner fixing ring is arranged on the outer side of the inner ring heat exchange tube bundle; the middle fixing ring is respectively connected with the outer fixing ring and the inner fixing ring through sieve plates; base plates are arranged between the outer side of the outer ring heat exchange tube bundle, between the outer side of the middle ring heat exchange tube bundle and the middle fixing ring, and between the outer side of the inner ring heat exchange tube bundle and the inner fixing ring; 99 porcelain aluminum oxide ceramic clamp sleeves are arranged on the outer surfaces of the middle parts of the inner ring heat exchange tube bundle and the middle ring heat exchange tube bundle; O-shaped seal rings made of chloroprene rubber resin are arranged at two ends of the ceramic clamp sleeves; and ceramic fixing rings are arranged on the O-shaped seal rings. According to the anti-abrasive device, the service life of equipment is prolonged; and the maintenance and replacement frequency and cost of the tube bundles are reduced.

Description

technical field [0001] The invention relates to the technical field of polysilicon production, in particular to a wear-resistant device for heat exchange tube bundles in a trichlorosilane synthesis furnace. Background technique [0002] The trichlorosilane synthesis reactor is the main equipment for synthesizing trichlorosilane raw materials in the production process of polysilicon enterprises. The synthesis of trichlorosilane mainly uses hydrogen chloride and silicon powder as raw materials, and the reaction is carried out in the synthesis furnace at a certain temperature. A tubular internal heat exchanger is installed in the reaction section of the synthesis furnace. The main material of the heat exchange tube bundle is 20# carbon steel pipe. The 20# carbon steel pipe has the weaknesses of low relative hardness, easy wear and corrosion. Under normal conditions of use, the wall of the heat exchange tube bundle will gradually become thinner due to the erosion and wear of hyd...

AI Technical Summary

Problems solved by technology

The reaction section of the synthesis furnace is equipped with a tube-and-tube built-in heat exchanger. The main material of the heat exchange tube bundle is 20# carbon steel pipe. The 20# carbon steel pipe has the weakness of relatively low hardness, easy wear and corrosion

Under normal use conditions, the wall of the heat exchange tube bundle will gradually become thinner due to the erosion and wear of hydrogen chloride gas and silicon powder, and the worn metal powder will be washed away (the main chemical components of 20# carbon steel pipes are: C, Si, S, P , Mn, Cr, Ni, Cu) will be brought into the system, which will have a great impact on the quality of system piping, equipment and products, greatly reducing the service life of equipment

What's more serious is that after the equipment has been in operation for 2 to 3 months, part of the tube walls of the 4 carbon steel pipes in the inner ring of the heat exchange tube bundle will be washed and worn out by hydrogen chloride gas and silicon powder, and the heat transfer oil in the tube enters the synthetic material system, and a large amount of silicon powder Contaminated by heat transfer oil and discarded, causing great economic losses

The cost of labor and materials required for each repair is relatively high. At the same time, the cycle of dismantling, overhauling and restoring installation is long, which delays normal production

[0003] In order to solve this problem, the traditional method is to install sleeves of the same material on the outer tube walls of the inner ring and the middle ring of the heat exchange tube bundle. Although the service life has been extended to a certain extent, the service time will not exceed 4 days. month, the adverse impact on the system has not improved

[0004] Chinese patent document CN203518800U (application number CN201320622017) discloses a wear-resistant and corrosion-resistant composite phase change heat Corrosion composite phase change heat exchanger is a device that utilizes low-temperature exhaust smoke heat source recovery. It solves the problem of wear and corrosion through the flexible use of gasification and liquefaction phase change enhanced heat transfer technology. It is used in the trichlorosilane synthesis furnace device for polysilicon production. This technology cannot be used for reference in terms of wear resistance of heat exchange tube bundles

Images