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Titanium tetrachloride preheater

A technology of titanium tetrachloride and preheater, applied in the direction of titanium dioxide, heat exchanger type, indirect heat exchanger, etc., can solve the problems of coil material corrosion, uneven heating of coil, low thermal efficiency of preheater, etc. Achieve the effect of improving heat exchange efficiency and avoiding low utilization rate

Active Publication Date: 2014-01-29
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Its shortcomings are: 1. In the radiant section of the titanium tetrachloride preheater, the coil will be unevenly heated due to unstable flame control or installation deviation, and the overheated part will affect the life of the coil material. Part of it will form condensation corrosion on the corrosive gas in the combustion gas, and it will also cause corrosion to the material of the coil; 2. The thermal efficiency of the preheater is low. Due to the vertical furnace structure, most of the high-temperature gas generated by the burner has not yet Timely heat exchange is directly discharged from the chimney through the furnace. Although there is a convection section to collect the heat of the high-temperature flue gas, the overall thermal efficiency is about 70%.

Method used

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Examples

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Embodiment 1

[0016] Example 1 : Adopt the titanium tetrachloride preheater of the present invention to meet the capacity of 60,000 tons / year chlorination titanium dioxide device

[0017] (1) Technological process: the high-temperature gas (1400°C) produced by the combustion of fuel gas and air enters the combustion section, and the low-temperature chimney tail gas (about 200°C) is introduced into the combustion chamber through the circulating fan, and enters the tetrachloride together with the high-temperature gas. The mixing section of the titanium preheater, after mixing evenly, enters the convection section to heat the coil, the flue gas after heat exchange enters the preheating section for further heat exchange and preheating, titanium tetrachloride liquid is sent from the outside, and finally the tail gas is discharged from the top chimney; Titanium tetrachloride medium enters the coil to exchange heat with high-temperature flue gas through countercurrent, first enters the preheating...

Embodiment 2

[0020] Example 2 : Adopt the titanium tetrachloride preheater of the present invention to meet the capacity of 100,000 tons / year chloride titanium dioxide plant

[0021] (1) Technological process: the high-temperature gas (1400°C) produced by burning fuel gas and air through the burner enters

[0022] In the combustion section, the low-temperature chimney exhaust gas (about 200°C) is introduced into the combustion chamber through the circulating fan, and enters the mixing section of the titanium tetrachloride preheater together with the high-temperature gas, and enters the convection section to heat the coil after mixing evenly. The flue gas enters the preheating section for further heat exchange and preheating. Titanium tetrachloride liquid is sent from the outside, and finally the tail gas is discharged from the chimney at the top; After the hot section is preheated, it enters the convection section for gasification and superheating, and is finally heated to the temperatur...

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Abstract

The invention discloses a titanium tetrachloride preheater which comprises a combustion segment, a mixing segment, a convection segment, a preheating segment and a chimney, wherein the combustion segment, the convection segment, the preheating segment and the chimney are arranged in an L shape. The titanium tetrachloride preheater is characterized in that high-temperature smoke generated by the combustion segment is evenly mixed in the mixing segment and then exchanges heat with a heating coil in the convection segment. A combustor is located at the end of the horizontal combustion segment, and a wide-end-up eccentric annular chimney channel is arranged in the inlet end of the combustion segment. The titanium tetrachloride preheater is safer, more reliable and higher in heat efficiency so as to solve various problems of an existing titanium tetrachloride preheater.

Description

technical field [0001] The invention relates to the technology and equipment for heating titanium tetrachloride in large and medium-sized chlorination titanium dioxide devices. Background technique [0002] At present, in the domestic chlorination titanium dioxide production industry, the titanium tetrachloride preheating furnace mainly adopts a vertical structure main body, the lower part is a radiation section, the upper part is a convection section, the top is a chimney, and the furnace body of the radiation section is equipped with a spiral The bottom of the furnace is equipped with a burner, and the high-temperature radiant heat generated by the burner directly heats the spiral coil, and the heated titanium tetrachloride is vaporized in the radiation section and overheated to the temperature required by the process, and then flows from the bottom of the radiation section There is a horizontal coil in the upper convection section. After heat exchange in the radiation sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/10C01G23/07
CPCY02P20/10
Inventor 蔡林清孙洪涛解为清徐兴荣杨国强刘泳吴振坤朱永东
Owner EAST CHINA ENG SCI & TECH
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