A finger heat exchanger with a three-tube structure used in a fluidized bed reactor for trichlorosilane synthesis

A bed reactor and trichlorosilane technology, applied in the field of finger heat exchangers, can solve problems such as large fluctuations in temperature values ​​and unstable quality of trichlorosilane, and achieve increased heat transfer temperature difference, stable reaction, The effect of uniform temperature distribution

Inactive Publication Date: 2016-06-15
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Claims
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Problems solved by technology

This unequal amount of heat release causes the temperature value in the furnace to fluctuate greatly, which makes the quality of the synthesized trichlorosilane unstable.

Method used

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  • A finger heat exchanger with a three-tube structure used in a fluidized bed reactor for trichlorosilane synthesis
  • A finger heat exchanger with a three-tube structure used in a fluidized bed reactor for trichlorosilane synthesis
  • A finger heat exchanger with a three-tube structure used in a fluidized bed reactor for trichlorosilane synthesis

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] The present invention is a finger-shaped heat exchanger with a three-tube structure used in a trichlorosilane synthesis fluidized bed reactor, which includes a heat-conducting oil inlet 1, a heat-exchange tube upper head 2, and a heat-exchange tube connection method Lan 3, several finger-shaped three-tube heat exchange tubes 4 and heat transfer oil outlet 5; the heat transfer oil inlet 1 is located on the top of the finger heat exchanger, and the heat exchange tube upper head 2 and heat exchange tube are arranged below it in turn. The pipe is connected to the flange 3, and the heat transfer oil outlet 5 is provided on the side of the head 2 on the heat exchange pipe.

[0024] The three-tube heat exchange tube 4 is composed of an inner tube 6, a liner 7 and an outer tube 8, and the inner tube 6, the liner 7 and the outer tube 8 are arranged from the ins...

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Abstract

The invention relates to a finger-type heat exchanger with a triple-sleeve structure used in a fluidized bed reactor for synthesizing trichlorosilane, which comprises a heat conduction oil inlet, an upper heat exchange tube seal head, a heat exchange tube connection flange, a plurality of finger-type triple-sleeve heat exchange tubes, and a heat conduction oil outlet, wherein each finger-type triple-sleeve heat exchange tube consists of an inner tube, a liner tube and an outer tube that are sequentially arranged from inside to outside, the upper end and the lower end of an annular interstice space between each inner tube and each liner tube are closed, and each annular interstice space is vacuumed to form a vacuum isolated layer. The heat exchanger solves the problem that oil temperature rises greatly as heat conduction oil enters the annular interstice spaces between the inner tubes and the outer tubes from the inner tubes, the temperature of a fluidized bed can be distributed uniformly, the reaction is stable, and the utilization ratio and the product purity of silicon powder are higher.

Description

technical field [0001] The invention belongs to the field of chemical equipment and technology, and in particular relates to a finger heat exchanger with a three-tube structure used in a trichlorosilane synthesis fluidized bed reactor. Background technique [0002] At present, trichlorosilane is not only the main raw material for the manufacture of polysilicon, but also an important intermediate for the synthesis of silane coupling agents and other organic silicon products. Due to the rapid development of the global solar photovoltaic industry, the demand for polysilicon has surged, resulting in a serious shortage of trichlorosilane supply. [0003] The production of trichlorosilane both at home and abroad uses silicon powder as raw material, which is chlorinated with hydrogen chloride in a fluidized bed reactor, and the reaction product is separated and purified until a product that meets the quality requirements is obtained. The process temperature for synthesizing trichl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/107
Inventor 张向京刘硕胡永琪刘玉敏王建英郝丛
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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