CN216890136U - Two-stage dust removal device for preparing titanium tetrachloride - Google Patents
Two-stage dust removal device for preparing titanium tetrachloride Download PDFInfo
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- CN216890136U CN216890136U CN202121482625.8U CN202121482625U CN216890136U CN 216890136 U CN216890136 U CN 216890136U CN 202121482625 U CN202121482625 U CN 202121482625U CN 216890136 U CN216890136 U CN 216890136U
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- dust remover
- temperature dust
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- titanium tetrachloride
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- 239000000428 dust Substances 0.000 title claims abstract description 135
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 title claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 87
- 239000002002 slurry Substances 0.000 claims abstract description 68
- 239000002699 waste material Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 238000005660 chlorination reaction Methods 0.000 claims abstract description 36
- 239000002893 slag Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010936 titanium Substances 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 19
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000003818 cinder Substances 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 239000007790 solid phase Substances 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract description 41
- 239000002245 particle Substances 0.000 abstract description 38
- 238000000034 method Methods 0.000 abstract description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 20
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 18
- 150000001805 chlorine compounds Chemical class 0.000 abstract description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 11
- 239000001569 carbon dioxide Substances 0.000 abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 10
- 239000010865 sewage Substances 0.000 abstract description 9
- 239000004408 titanium dioxide Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 5
- 238000009835 boiling Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 28
- 230000008569 process Effects 0.000 description 16
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 11
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 11
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 11
- 229960002089 ferrous chloride Drugs 0.000 description 11
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 11
- 229940099607 manganese chloride Drugs 0.000 description 11
- 235000002867 manganese chloride Nutrition 0.000 description 11
- 239000011565 manganese chloride Substances 0.000 description 11
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 10
- 229940032296 ferric chloride Drugs 0.000 description 10
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 10
- 229960004424 carbon dioxide Drugs 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 239000007795 chemical reaction product Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model discloses a two-stage dust removal device for preparing titanium tetrachloride, wherein in the preparation production of crude titanium tetrachloride, gases such as high-temperature titanium tetrachloride, carbon dioxide, carbon monoxide and the like generated by the reaction of a chlorination furnace carry unreacted carbon powder, high-titanium slag and high-boiling-point chlorides, the gases are firstly fed into a high-temperature dust remover to remove the carbon powder and titanium dioxide particles, then the gases are cooled by a cooling tower to enable the high-boiling-point chlorides in the gas flow to be cooled into solid particles, and then the solid particles are removed by a low-temperature dust remover. Carbon powder and titanium dioxide particles collected by the high-temperature dust remover exist in a slag tank and return to the chlorination furnace as raw materials. The high boiling point chloride collected by the low temperature dust remover enters a waste slurry tank, water is added into the waste slurry tank to prepare chloride slurry, and the chloride slurry is sent to a sewage treatment station for treatment. The utility model has simple structure, high dust removal efficiency and good dust removal effect. The dedusting method has simple steps, reduces the solid content in the crude titanium tetrachloride, recovers valuable components in the waste residue, and saves more energy.
Description
Technical Field
The utility model relates to a two-stage dust removal device for preparing titanium tetrachloride.
Background
In the process of preparing titanium tetrachloride by titanium slag chlorination, because titanium slag and petroleum coke contain a small amount of other metal impurities (iron oxide, manganese oxide, aluminum oxide and the like), chlorination reaction products contain a small amount of high-boiling-point chlorides (iron chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) in addition to gases such as titanium tetrachloride, carbon dioxide, carbon monoxide and the like. Meanwhile, as chlorination reaction is a reaction of gas (chlorine) and solid particles (carbon and titanium dioxide) in a high-temperature fluidized state, the reaction products of titanium tetrachloride, carbon dioxide, carbon monoxide and high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) carry a large amount of unreacted fine carbon particles and titanium dioxide particles. These solid particles and high boiling point chlorides must be removed before the titanium tetrachloride gases are condensed and collected, or they can interfere with the post-process purification of titanium tetrachloride.
At present, two main chlorination dust removal processes are adopted in industrial production. One is that: the outlet of the chlorination furnace is connected with 2 large-diameter and large-area inertial dust collectors in series, and the reaction products of titanium tetrachloride, carbon dioxide, carbon monoxide and high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) carry solid particles to sequentially enter the two inertial dust collectors. The airflow is decelerated through the large diameter of the inertial dust collector, large-area heat exchange is carried out to cool the airflow, high boiling point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) in the airflow are condensed into solid particles, the solid particles are attached to the bottom of the dust collector together with unreacted carbon powder and titanium dioxide particles, the solid particles are periodically discharged into a slag pool, water is flushed into a sewage station for treatment, and the separated gas enters a titanium tetrachloride condensation collection system.
The other is as follows: the outlet of the chlorination furnace is sequentially connected with a cooling tower and a cyclone dust collector in series, solid particles carried by reaction products of titanium tetrachloride, carbon dioxide, carbon monoxide and high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) firstly enter the cooling tower and contact with liquid titanium tetrachloride sprayed from the top of the tower, the temperature of the gas flow is reduced to 150-220 ℃, and the high-boiling-point chlorides in the gas flow are condensed into a solid state. The airflow mixed with solid chloride, titanium dioxide and carbon powder enters a cyclone dust collector, reaction products of titanium tetrachloride, carbon dioxide and carbon monoxide are separated from solid particles (high-boiling-point chloride, carbon powder and titanium dioxide) in the cyclone dust collector, the solid particles are discharged from the bottom, and the solid particles are pulped by water and then sent to a sewage treatment station. The separated gas enters a titanium tetrachloride condensation and collection system.
In the two dust removal processes, no matter the traditional inertial dust removal process or the cyclone dust removal process which is newly started in about 10 years is adopted, the dust removal efficiency is not high, the solid content in the titanium tetrachloride collected by subsequent condensation is seriously overproof, and the condensation and the refining of the titanium tetrachloride in the subsequent process are seriously influenced, particularly in the traditional inertial dust removal process, the solid content in the titanium tetrachloride is more than 10 percent, a large-scale settling device must be added for settling, the titanium tetrachloride can be sent to the titanium tetrachloride refining process, and a large amount of sewage is generated during dust treatment. In addition, the two dust removal processes do not separate valuable components (carbon powder and titanium dioxide) from high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) in the slag, and the valuable components and the high-boiling-point chlorides are sent to a post-process sewage treatment process together, so that the waste residue treatment load is greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a two-stage dust removal device for preparing titanium tetrachloride, which has the advantages of simple structure, high dust removal efficiency and good dust removal effect.
In order to solve the technical problem, the utility model provides a two-stage dust removal device for preparing titanium tetrachloride, which comprises a chlorination furnace, a high-temperature dust remover, a slag tank, a cooling tower, a low-temperature dust remover, a waste slurry tank and a heat exchanger, wherein the chlorination furnace is connected with the high-temperature dust remover;
the chlorination furnace is provided with a gas phase inlet, a solid phase inlet and an exhaust port;
the high-temperature dust remover is provided with an air inlet, a slag discharge port and an air outlet;
a feed inlet and a discharge outlet are arranged on the slag groove;
a gas inlet, a titanium tetrachloride slurry inlet and a gas outlet are formed in the cooling tower;
the low-temperature dust remover is provided with an air inlet, a slag discharge port and an air outlet;
the waste slurry tank is provided with a waste residue inlet, a clear water feeding inlet, a reflux port and a waste slurry outlet;
the heat exchanger is provided with an inlet and an outlet;
the gas vent of chlorination furnace links to each other with high temperature dust remover's air inlet, high temperature dust remover's row cinder notch links to each other with the sediment groove feed inlet through first one-way solenoid valve, the solid phase import that sediment groove discharge gate passes through first back flow and chlorination furnace links to each other, be equipped with nitrogen gas inlet on the first back flow, high temperature dust remover's gas outlet links to each other with the gas inlet of cooling tower, the gas outlet of cooling tower links to each other with low temperature dust remover's air inlet, the row cinder notch of low temperature dust remover links to each other with the waste residue entry in useless thick liquid groove through second one-way solenoid valve, the useless thick liquid export in useless thick liquid groove passes through the pump and links to each other with the heat exchanger entry, the heat exchanger export links to each other through the backward flow mouth of second back flow with useless thick liquid groove, be equipped with the mud drainage branch pipe on the second back flow.
Preferably, the heat exchanger is a graphite heat exchanger or a titanium heat exchanger, the cooling medium of the heat exchanger is circulating water, and the pump is a centrifugal pump.
Preferably, the shell of the chlorination furnace, the shell of the high-temperature dust remover, the shell of the cooling tower and the shell of the low-temperature dust remover are all made of carbon steel, the shell of the chlorination furnace, the shell of the high-temperature dust remover, the shell of the cooling tower and the shell of the low-temperature dust remover are all made of alumina or silica with the refractoriness of 1450 ℃, and the shell of the low-temperature dust remover and the shell of the high-temperature dust remover are all made of cyclone dust removers.
For the sake of simplicity of explanation, the two-stage dust removing apparatus for titanium tetrachloride production according to the present invention will be simply referred to as the present apparatus.
The dust removal method of the device comprises the following steps:
(1) in the production of titanium tetrachloride, gas products discharged from the top of a chlorination furnace enter a high-temperature dust remover, the temperature of an air inlet of the high-temperature dust remover is controlled to be 950-1200 ℃, the flow rate of a medium is 19-26m/s, the pressure of inlet gas is 0.05-0.15MPa, solid particles are separated from the gas products in the high-temperature dust remover, the solid particles flow into a slag tank and are conveyed back to the chlorination furnace by nitrogen for use, and the pressure of the nitrogen in a first return pipe is controlled to be 0.2-0.6 MPa;
(2) gas products discharged from the high-temperature dust remover enter a cooling tower, titanium tetrachloride slurry is injected into the cooling tower through a titanium tetrachloride slurry inlet, high-temperature gas flow in the cooling tower is in gas-liquid contact with the titanium tetrachloride slurry, the temperature of a gas outlet of the cooling tower is controlled to be 160-phase-changing 200 ℃, and the pressure is controlled to be 0.05-0.1 MPa;
(3) gas products discharged from a gas outlet of the cooling tower enter a low-temperature dust remover, the flow rate of a medium at a gas inlet of the low-temperature dust remover is controlled to be 19-26m/s, the temperature of the medium at a gas outlet of the low-temperature dust remover is controlled to be 150-200 ℃, the pressure is controlled to be 0.03-0.1MPa, high-boiling-point solid particles are separated from the gas products in the low-temperature dust remover, the high-boiling-point solid particles are discharged from the bottom of the low-temperature dust remover and enter a waste slurry tank, and pure gas products are discharged from a gas outlet of the low-temperature dust remover and enter a subsequent system;
(4) adding clear water into the waste slurry tank from a clear water inlet, mixing the clear water with solid particles in the waste slurry tank to form waste slurry, cooling the waste slurry by a heat exchanger under the action of a pump, refluxing one part of the waste slurry to the waste slurry tank, and delivering the other part of the waste slurry to a sewage station for treatment from a branch pipe, wherein the solid-to-liquid ratio in the waste slurry tank is controlled to be 15-25%, and the temperature of the waste slurry is controlled to be 40-90 ℃.
The principle and the advantages of the device are as follows: gaseous products, namely titanium tetrachloride, carbon dioxide, carbon monoxide and high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like), which come out from the top of the chlorination furnace carry unreacted carbon powder and high-titanium slag to enter a high-temperature dust remover. Solid particles (carbon powder, titanium dioxide and the like) and gas products, namely titanium tetrachloride, carbon dioxide, carbon monoxide and high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) are separated in a high-temperature dust remover. The gaseous products of titanium tetrachloride, carbon dioxide, carbon monoxide, high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) separated by the high-temperature dust remover and a small amount of unseparated dust come out from the top of the high-temperature dust remover and enter a cooling tower, high-temperature gas flow in the tower is in gas-liquid contact with titanium tetrachloride slurry, and the high-boiling-point chlorides (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) in the gas flow are changed into solid particles. The airflow cooled by the cooling tower enters a low-temperature dust remover (secondary dust removal), and high-boiling-point solid particles (ferric chloride, ferrous chloride, manganese chloride, aluminum trichloride and the like) and gases (titanium tetrachloride, carbon dioxide and carbon monoxide) are separated in the low-temperature dust remover.
Drawings
Fig. 1 is a schematic view of the structure of the apparatus.
Detailed Description
Referring to fig. 1, a two-stage dust removing device for preparing titanium tetrachloride comprises a chlorination furnace 1, a high-temperature dust remover 2, a slag tank 3, a cooling tower 4, a low-temperature dust remover 5, a waste slurry tank 6 and a heat exchanger 7;
the chlorination furnace 1 is provided with a gas phase inlet 11, a solid phase inlet 12 and an exhaust port 13;
the high-temperature dust remover 2 is provided with an air inlet 21, a slag discharge port 22 and an air outlet 23;
the slag groove 3 is provided with a feed inlet 31 and a discharge outlet 32;
the cooling tower 4 is provided with a gas inlet 41, a titanium tetrachloride slurry inlet 42 and a gas outlet 43;
the low-temperature dust remover 5 is provided with an air inlet 51, a slag discharge port 52 and an air outlet 53;
the waste slurry tank 6 is provided with a waste residue inlet 61, a clear water adding inlet 62, a return port 63 and a waste slurry outlet 64;
the heat exchanger 7 is provided with an inlet 71 and an outlet 72;
the gas vent 13 of chlorination furnace 1 links to each other with the gas inlet 31 of high temperature dust remover 2, the row's of cinder notch 22 of high temperature dust remover 2 links to each other with slag bath 3 feed inlet 31 through first one-way solenoid valve 81, slag bath 3 discharge gate 32 links to each other with the solid phase import 12 of chlorination furnace 1 through first backflow pipe 33, be equipped with the nitrogen gas 331 on the first backflow pipe 33 and add the mouth, the gas outlet 23 of high temperature dust remover 2 links to each other with the gas inlet 41 of cooling tower 4, the gas outlet 43 of cooling tower 4 links to each other with the gas inlet 51 of low temperature dust remover 5, the row's of cinder notch 52 of low temperature dust remover 5 links to each other with the waste residue entry 61 of useless thick liquid groove 6 through second one-way solenoid valve 82, useless thick liquid export 64 of useless thick liquid groove 6 links to each other with heat exchanger 7 entry 71 through pump 9, heat exchanger 7 export 72 links to each other with the backflow mouth 63 of useless thick liquid groove 6 through second backflow pipe 73, be equipped with row's thick liquid branch pipe 731 on the second backflow pipe 73.
The heat exchanger 7 is a graphite heat exchanger or a titanium heat exchanger, the cooling medium of the heat exchanger 7 is circulating water, and the pump 9 is a centrifugal pump.
The shell of the chlorination furnace 1, the shell of the high-temperature dust remover 2, the shell of the cooling tower 4 and the shell of the low-temperature dust remover 5 are all made of carbon steel, the shell of the chlorination furnace 1, the shell of the high-temperature dust remover 2 and the shell of the cooling tower 4 are all made of alumina or silica with the refractoriness of 1450 ℃, and the low-temperature dust remover 5 and the high-temperature dust remover 2 are both cyclone dust removers.
The first embodiment is as follows:
a dust removal method of a two-stage dust removal device for preparing titanium tetrachloride comprises the following steps:
(1) in the production of titanium tetrachloride, gas products discharged from the top of a chlorination furnace enter a high-temperature dust remover, the temperature of an air inlet of the high-temperature dust remover is controlled to be 950-1200 ℃, the flow rate of a medium is 20m/s, the pressure of inlet gas is 0.05-0.15MPa, solid particles are separated from the gas products in the high-temperature dust remover, the solid particles flow into a slag tank and are conveyed back to the chlorination furnace by nitrogen for use, and the pressure of the nitrogen in a first return pipe is controlled to be 0.2-0.6 MPa;
(2) gas products discharged from the high-temperature dust remover enter a cooling tower, titanium tetrachloride slurry is injected into the cooling tower through a titanium tetrachloride slurry inlet, high-temperature gas flow in the cooling tower is in gas-liquid contact with the titanium tetrachloride slurry, the temperature of a gas outlet of the cooling tower is controlled to be 160-170 ℃, and the pressure is controlled to be 0.05-0.1 MPa;
(3) gas products discharged from a gas outlet of the cooling tower enter a low-temperature dust remover, the flow rate of a medium at a gas inlet of the low-temperature dust remover is controlled to be 20m/s, the temperature of the medium at a gas outlet of the low-temperature dust remover is controlled to be 150-;
(4) adding clear water into the waste slurry tank from a clear water inlet, mixing the clear water with solid particles in the waste slurry tank to form waste slurry, cooling the waste slurry by a heat exchanger under the action of a pump, refluxing one part of the waste slurry to the waste slurry tank, and delivering the other part of the waste slurry to a sewage station for treatment from a branch pipe, wherein the solid-to-liquid ratio in the waste slurry tank is controlled to be 15-25%, and the temperature of the waste slurry is controlled to be 40-90 ℃.
Example one comparison of the consumption and product quality of the dedusting process with the conventional dedusting process is shown in table 1:
TABLE 1
As can be seen from Table 1, in the first example, the consumption of titanium slag and the consumption of carbon are both reduced, and the solid content in titanium tetrachloride is obviously reduced.
The second embodiment:
a dust removal method of a two-stage dust removal device for preparing titanium tetrachloride comprises the following steps:
(1) in the production of titanium tetrachloride, gas products discharged from the top of a chlorination furnace enter a high-temperature dust remover, the temperature of an air inlet of the high-temperature dust remover is controlled to be 950-1200 ℃, the flow rate of a medium is 23m/s, the pressure of inlet gas is 0.05-0.15MPa, solid particles are separated from the gas products in the high-temperature dust remover, the solid particles flow into a slag tank and are conveyed back to the chlorination furnace by nitrogen for use, and the pressure of the nitrogen in a first return pipe is controlled to be 0.2-0.6 MPa;
(2) gas products discharged from the high-temperature dust remover enter a cooling tower, titanium tetrachloride slurry is injected into the cooling tower through a titanium tetrachloride slurry inlet, high-temperature gas flow in the cooling tower is in gas-liquid contact with the titanium tetrachloride slurry, the temperature of a gas outlet of the cooling tower is controlled to be 170-180 ℃, and the pressure is controlled to be 0.05-0.1 MPa;
(3) gas products discharged from a gas outlet of the cooling tower enter a low-temperature dust remover, the flow rate of a medium at a gas inlet of the low-temperature dust remover is controlled to be 23m/s, the temperature of the medium at a gas outlet of the low-temperature dust remover is controlled to be 160-170 ℃, the pressure is controlled to be 0.03-0.1MPa, high-boiling-point solid particles are separated from the gas products in the low-temperature dust remover, the high-boiling-point solid particles are discharged from the bottom of the low-temperature dust remover to enter a waste slurry tank, and pure gas products are discharged from the gas outlet of the low-temperature dust remover and enter a subsequent system;
(4) adding clear water into the waste slurry tank from a clear water inlet, mixing the clear water with solid particles in the waste slurry tank to form waste slurry, cooling the waste slurry by a heat exchanger under the action of a pump, refluxing one part of the waste slurry to the waste slurry tank, and delivering the other part of the waste slurry to a sewage station for treatment from a branch pipe, wherein the solid-to-liquid ratio in the waste slurry tank is controlled to be 15-25%, and the temperature of the waste slurry is controlled to be 40-90 ℃.
The consumption and product quality of the dust removal process described in example two compared to the conventional dust removal process are shown in table 2:
TABLE 2
As can be seen from Table 2, in the second example, the consumption of titanium slag and the consumption of carbon are both reduced, and the solid content in titanium tetrachloride is obviously reduced.
Example three:
a dust removal method of a two-stage dust removal device for preparing titanium tetrachloride comprises the following steps:
(1) in the production of titanium tetrachloride, gas products discharged from the top of a chlorination furnace enter a high-temperature dust remover, the temperature of an air inlet of the high-temperature dust remover is controlled to be 950-1200 ℃, the flow rate of a medium is 26m/s, the pressure of inlet gas is 0.05-0.15MPa, solid particles are separated from the gas products in the high-temperature dust remover, the solid particles flow into a slag tank and are conveyed back to the chlorination furnace by nitrogen for use, and the pressure of the nitrogen in a first return pipe is controlled to be 0.2-0.6 MPa;
(2) gas products discharged from the high-temperature dust remover enter a temperature reduction tower, titanium tetrachloride slurry is injected into the temperature reduction tower through a titanium tetrachloride slurry inlet, high-temperature gas flow in the temperature reduction tower is in gas-liquid contact with the titanium tetrachloride slurry, the temperature of a gas outlet of the temperature reduction tower is controlled to be 190 ℃ plus materials, and the pressure is controlled to be 0.05-0.1 MPa;
(3) gas products discharged from a gas outlet of the cooling tower enter a low-temperature dust remover, the flow rate of a medium at a gas inlet of the low-temperature dust remover is controlled to be 26m/s, the temperature of the medium at a gas outlet of the low-temperature dust remover is controlled to be 170-180 ℃, the pressure is controlled to be 0.03-0.1MPa, high-boiling-point solid particles are separated from the gas products in the low-temperature dust remover, the high-boiling-point solid particles are discharged from the bottom of the low-temperature dust remover to enter a waste slurry tank, and pure gas products are discharged from the gas outlet of the low-temperature dust remover and enter a subsequent system;
(4) adding clear water into the waste slurry tank from a clear water inlet, mixing the clear water with solid particles in the waste slurry tank to form waste slurry, cooling the waste slurry by a heat exchanger under the action of a pump, refluxing one part of the waste slurry to the waste slurry tank, and delivering the other part of the waste slurry to a sewage station for treatment from a branch pipe, wherein the solid-to-liquid ratio in the waste slurry tank is controlled to be 15-25%, and the temperature of the waste slurry is controlled to be 40-90 ℃.
Example three-one the consumption and product quality of the dedusting process compared to the conventional dedusting process is shown in table 3:
TABLE 3
As can be seen from Table 3, in the examples, the consumption of titanium slag and the consumption of carbon are both reduced, and the solid content in titanium tetrachloride is obviously reduced.
Claims (3)
1. A two-stage dust collector for preparing titanium tetrachloride which characterized in that: comprises a chlorination furnace, a high-temperature dust remover, a slag tank, a cooling tower, a low-temperature dust remover, a waste slurry tank and a heat exchanger;
the chlorination furnace is provided with a gas phase inlet, a solid phase inlet and an exhaust port;
the high-temperature dust remover is provided with an air inlet, a slag discharge port and an air outlet;
a feed inlet and a discharge outlet are arranged on the slag groove;
a gas inlet, a titanium tetrachloride slurry inlet and a gas outlet are formed in the cooling tower;
the low-temperature dust remover is provided with an air inlet, a slag discharge port and an air outlet;
the waste slurry tank is provided with a waste residue inlet, a clear water feeding inlet, a reflux port and a waste slurry outlet;
the heat exchanger is provided with an inlet and an outlet;
the gas vent of chlorination furnace links to each other with high temperature dust remover's air inlet, high temperature dust remover's row cinder notch links to each other with the sediment groove feed inlet through first one-way solenoid valve, the solid phase import that sediment groove discharge gate passes through first back flow and chlorination furnace links to each other, be equipped with nitrogen gas inlet on the first back flow, high temperature dust remover's gas outlet links to each other with the gas inlet of cooling tower, the gas outlet of cooling tower links to each other with low temperature dust remover's air inlet, the row cinder notch of low temperature dust remover links to each other with the waste residue entry in useless thick liquid groove through second one-way solenoid valve, the useless thick liquid export in useless thick liquid groove passes through the pump and links to each other with the heat exchanger entry, the heat exchanger export links to each other through the backward flow mouth of second back flow with useless thick liquid groove, be equipped with the mud drainage branch pipe on the second back flow.
2. The two-stage dust removing device for preparing titanium tetrachloride according to claim 1, wherein: the heat exchanger is a graphite heat exchanger or a titanium heat exchanger, the cooling medium of the heat exchanger is circulating water, and the pump is a centrifugal pump.
3. The two-stage dust removing device for preparing titanium tetrachloride according to claim 1, wherein: the shell of the chlorination furnace, the shell of the high-temperature dust remover, the shell of the cooling tower and the shell of the low-temperature dust remover are all made of carbon steel, the shell of the chlorination furnace, the shell of the high-temperature dust remover and the shell of the cooling tower are all made of alumina or silica with the refractoriness of 1450 ℃, and the low-temperature dust remover and the high-temperature dust remover are both cyclone dust removers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113277553A (en) * | 2021-06-29 | 2021-08-20 | 蚌埠中瓷纳米科技有限公司 | Two-stage dust removal device and method for preparing titanium tetrachloride |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113277553A (en) * | 2021-06-29 | 2021-08-20 | 蚌埠中瓷纳米科技有限公司 | Two-stage dust removal device and method for preparing titanium tetrachloride |
| CN113277553B (en) * | 2021-06-29 | 2023-11-24 | 蚌埠中瓷纳米科技有限公司 | Two-stage dust removal device and dust removal method for preparing titanium tetrachloride |
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