Chlorination furnace flue gas rinsing device and chlorination furnace

Abstract

The application discloses a chlorination furnace flue gas rinsing device, which comprises a feeding unit provided with a breathing pipe, a circulating unit for containing liquid-phase titanium tetrachloride, the breathing pipe being connected with the circulating unit and located above the liquid surface, a rinsing unit comprising a rinsing tower, and a recovery unit in communication with the circulating unit. The application also relates to a chlorination furnace comprising the chlorination furnace flue gas rinsing device. The application greatly reduces the flue gas temperature through heat exchange, effectively improves the recovery rate of titanium tetrachloride, reduces the production cost, and provides higher-quality crude titanium tetrachloride for a subsequent refining system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of titanium tetrachloride production, especially to a chlorination furnace flue gas rinsing device and a chlorination furnace comprising the same. BACKGROUND

[0002] Titanium tetrachloride is a main raw material for producing titanium sponge and titanium dioxide, and can be used for preparing organic titanium compounds, electronic ceramics containing titanium, titanium oxygen gem, etc. In addition, it also has special uses in glass, hard alloy, leather, printing and dyeing industries, etc. In the prior art, ilmenite is smelted into high-titanium slag by an electric furnace, oil coke is added in a chlorination furnace, chlorine gas is passed to generate crude titanium tetrachloride, and a large amount of high-temperature furnace gas is also generated. A rinsing tower is used in a condensing system to spray and condense the mixed furnace gas treated by a dust collector condenser, so that most of the titanium tetrachloride gas in the mixed gas is condensed into liquid and enters a circulating liquid. The existing furnace gas treatment process equipment is large and heavy, the technology is backward, the temperature is difficult to control, and energy cannot be fully utilized to achieve the purpose of energy saving and emission reduction.

[0003] To solve the above problems, there is an urgent need to develop a chlorination furnace flue gas rinsing device with energy saving and environmental protection and good treatment effect. SUMMARY

[0004] The main purpose of the present application is to provide a chlorination furnace flue gas rinsing device and a chlorination furnace comprising the same, which can reasonably utilize the heat of high-temperature titanium tetrachloride flue gas, improve the recovery rate of titanium tetrachloride, reduce the emission of chlorides in tail gas, is conducive to environmental protection, and achieves the purposes of energy saving, emission reduction and high efficiency.

[0005] According to one aspect of the present application, a chlorination furnace flue gas rinsing device is provided, which comprises a feeding unit, a circulating unit, a rinsing unit and a recovery unit. The feeding unit is provided with a breathing pipe. The circulating unit is used to contain liquid-phase titanium tetrachloride. The breathing pipe is connected with the circulating unit and located above the liquid surface. The rinsing unit comprises a rinsing tower. The recovery unit is in communication with the circulating unit.

[0006] According to one embodiment of the present application, the circulating unit comprises a circulating tank, which is divided into a first chamber and a second chamber in communication with each other by a partitioning member.

[0007] According to one embodiment of the present application, the rinsing unit further comprises a rinsing pipeline and a rinsing circulating pump. One end of the rinsing pipeline is connected with the circulating unit, and the other end is connected with the rinsing tower.

[0008] According to one embodiment of the present application, a heat exchanger and a spray head are arranged on the rinsing pipeline.

[0009] According to one embodiment of the present application, the heat exchanger comprises at least one refrigerant system, and the refrigerant system comprises multiple refrigerants.

[0010] According to one embodiment of the present application, the elution device comprises at least one elution circulating pump, and the elution circulating pump is arranged on the elution pipeline.

[0011] According to one embodiment of the present application, the top of the elution tower is provided with a gas phase outlet, and the bottom of the elution tower is provided with a liquid phase outlet, and the liquid phase outlet is connected with the circulating unit.

[0012] According to one embodiment of the present application, the circulating unit is provided with a liquid level meter.

[0013] According to one embodiment of the present application, the elution device is multi-stage, and each stage uses the same or different refrigerant.

[0014] According to another aspect of the present application, the present application also provides a chlorination furnace, which comprises the chlorination furnace flue gas elution device of the present application.

[0015] In the chlorination furnace flue gas elution device according to the embodiment of the present application, a circulating tank is arranged in the circulating unit, the two chambers of the circulating tank are communicated, the liquid phase titanium tetrachloride is collected and mixed in the circulating tank, the flue gas is sprayed by the spraying unit, and the flue gas is precipitated into the circulating tank due to gravity after the temperature of the flue gas is reduced to zero, and is transported to the recovery unit by the circulating pump, the cooled titanium tetrachloride is recovered by the recovery unit for subsequent processing, the device greatly reduces the temperature of the flue gas, effectively improves the recovery rate of the titanium tetrachloride, reduces the production cost, and provides higher quality crude titanium tetrachloride for the subsequent refining system. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required by the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A schematic diagram of a chlorination furnace flue gas elution device according to one exemplary embodiment of the present application is shown;

[0018] Figure 2 A schematic diagram of a chlorination furnace and a chlorination furnace flue gas elution device according to one exemplary embodiment of the present application is shown.

[0019] The reference signs in the drawings are explained as follows:

[0020] 1 - Circulation tank; 2 - Isolation component; 3 - Liquid level meter; 4 - Spray pipeline; 5 - Elution tower; 6 - Heat exchanger; 7 - Transfer pump; 8 - Elution circulation pump; 9 - Recovery unit; 10 - Storage tank; 11 - Breathing pipe; 12 - Gas outlet; 13 - Liquid supplement pipeline; 14 - Control system; 15 - Main furnace; 16 - Auxiliary furnace; 17 - Chlorination furnace. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0023] As shown in Figure 1 and 2 The present application provides a chlorination furnace flue gas elution device and a chlorination furnace 17 comprising the chlorination furnace flue gas elution device. The chlorination furnace flue gas elution device comprises a feeding unit, the feeding unit is provided with a breathing pipe 11; a circulation unit for containing liquid phase titanium tetrachloride, the breathing pipe 11 is connected with the circulation unit and located above the liquid surface; an elution unit comprising an elution tower 5; and a recovery unit 9 connected with the circulation unit.

[0024] In the chlorination furnace flue gas elution device according to the embodiments of the present application, the circulation unit comprises a circulation tank 1, which can be a cube, a cuboid, a cylinder or any suitable three-dimensional shape that can be used as a container. The circulation tank 1 is provided with an isolation component 2, which is preferably a partition plate vertically arranged in the upper part of the circulation tank 1. The length of the partition plate is 1 / 3 to 2 / 3 of the height of the circulation tank 1. The partition plate divides the circulation tank 1 into a first chamber and a second chamber that are in communication at the bottom. The liquid phase titanium tetrachloride can be mixed and collected in the two chambers.

[0025] The circulation tank 1 is provided with a breathing pipe 11 located above the liquid surface of the titanium tetrachloride in the circulation tank 1. The first end of the breathing pipe 11 is connected with the circulation tank 1, and the second end is used to communicate with the elution tower 5. The communication of the breathing pipe 11 can prevent the internal pressure of the circulation tank 1 from being too high, thereby preventing the liquid phase titanium tetrachloride from entering the circulation tank 1.

[0026] The outer circumferential surface of the circulating tank 1 is provided with a liquid supply unit for supplementing the required circulating leaching liquid in the circulating tank 1, and the circulating leaching liquid flows in the leaching unit and the circulating tank 1. The liquid supply unit is a liquid supplement pipeline 13 in communication with the storage tank 10. The circulating tank 1 is provided with a liquid level meter 3 for monitoring the liquid level in the circulating tank 1, which is used to detect whether the liquid level is at a preset value and monitor the occurrence of abnormal state. The chlorination furnace 17 can also include a control system 14, which presets a liquid level interval required for the operation in the circulating tank 1, controls the operation of the flue gas leaching device, obtains the liquid level in the circulating tank 1, and when the liquid level in the circulating tank 1 is lower than the height interval, controls the appropriate amount of raw material to be poured through the liquid supplement pipeline 13 to cover the partition, and preferably the liquid level required for the reaction is 70%-80%.

[0027] The leaching unit includes a leaching tower 5, a leaching circulating pump 8 and a spraying pipeline 4. The top of the leaching tower 5 is provided with a gas outlet 12, and the bottom is in communication with the circulating tank 1 through a leaching pipeline. The spraying pipeline 4 is provided with a heat exchanger 6 and a leaching circulating pump 8.

[0028] The leaching circulating pump 8 is correspondingly arranged in the chamber of the circulating tank 1, for example, one leaching circulating pump 8 is arranged in each of the first chamber and the second chamber, respectively, to transport titanium tetrachloride in the corresponding chamber to the heat exchanger 6, and to spray the leaching tower 5 through the spraying pipeline 4. The spraying pipeline 4 is provided with a spray head, which disperses liquid-phase titanium tetrachloride through high pressure to fully contact with gas-phase titanium tetrachloride and complete heat exchange.

[0029] The heat exchanger 6 is used for cooling the circulating leaching liquid, and is preferably a spiral plate heat exchanger or a tube heat exchanger. The heat exchanger 6 reduces the heat of titanium tetrachloride in the circulating process through a refrigerant system. The refrigerant system is filled with a refrigerant, which is circulating water or frozen brine.

[0030] The leaching pipeline and the heat exchanger 6 are correspondingly arranged with the leaching tower 5, and the number is positively correlated to ensure that the leaching effect of each leaching tower 5 can reach the expected value.

[0031] In some embodiments, the leaching device can be arranged as multiple stages, and each stage can use the same or different refrigerant. The leaching device can be preferably arranged as a 4-stage leaching device, and the refrigerant used in the first 3 stages is circulating water, and the refrigerant used in the 4th stage is frozen brine. After multi-stage heat exchange, the flue gas temperature can be reduced to below-5℃.

[0032] To prevent contamination of the chlorination furnace 17 by the liquid or gas generated during the reaction, the circulation tank 1, the scrubbing tower 5, and the breather pipe 11 are made of stainless steel or corrosion-resistant materials. The inner wall of the circulation tank 1 and the outer wall of the scrubbing tower 5 are coated with an anti-corrosion coating, which consists of metallic elements or oxide coatings. By setting an anti-corrosion smooth coating, the corrosion resistance of the chlorination furnace 17 can be increased, making it less prone to damage, reducing maintenance frequency, and extending the service life of the chlorination furnace 17.

[0033] A conveying pipeline is provided around the outer periphery of the circulation tank 1. The recovery unit 9 is connected to the circulation tank 1 through the conveying pipeline. A transfer pump 7 is installed on the conveying pipeline. The control system 14 can preset the liquid level range required for operation in the circulation tank 1. When the liquid level exceeds this range, the liquid titanium tetrachloride is conveyed to the recovery unit 9 by the transfer pump 7. When the liquid level falls below this range, the transfer stops. Preferably, the liquid level range that meets the reaction requirements is 70%-80%. The recovery rate of titanium tetrachloride through this rinsing device can reach over 99%.

[0034] One specific application of the present invention is, for example, Figure 2 As shown, the liquid level is replenished to 70% through the replenishment pipeline 13 until it covers the baffle. The rinsing circulation pump 8 is started to spray the rinsing tower 5. Then the heat exchanger 6 is started to cool the circulating rinsing liquid. The flue gas generated by the reaction of the main furnace 15 and the auxiliary furnace 16 is introduced into the rinsing tower 5 for rinsing. When the collected titanium tetrachloride liquid level reaches 80%, the liquid phase titanium tetrachloride is transported to the recovery unit 9 through the transfer pump 7. The transfer is stopped when the liquid level is lower than 70%.

[0035] The present invention also provides a chlorination furnace 17, such as Figure 2 As shown, the chlorination furnace 17 includes the flue gas scrubbing device described in this invention. The chlorination furnace 17 provided by this invention, by setting up a bottom-connected circulation tank 1 and a scrubbing unit, effectively reduces the flue gas temperature to below -5°C and increases the recovery rate of titanium tetrachloride to over 99%, achieving economic efficiency, environmental friendliness, and high efficiency.

[0036] This invention incorporates a circulation tank 1 within a circulation unit. The two chambers of circulation tank 1 are connected at their bottoms, allowing liquid titanium tetrachloride to mix and collect within the circulation tank 1. A spray unit sprays the flue gas, and once the flue gas temperature drops below zero, it settles back into circulation tank 1 due to gravity. The cooled titanium tetrachloride is then transported to a recovery unit 9 by a transfer pump 7, where it is recycled and reused. This device significantly reduces the flue gas temperature, effectively improves the recovery rate of titanium tetrachloride, lowers production costs, and provides higher-quality crude titanium tetrachloride for subsequent refining systems.

[0037] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary, and is not intended to mean that the scope of the embodiments disclosed by the present application (including claims) is limited to these examples; under the idea of the embodiments of the present application, the above embodiments or technical features in different embodiments can also be combined, and there are many other changes of different aspects of the embodiments of the present application as above. In order to be brief, they are not provided in details. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A chlorination furnace flue gas rinse device characterized by, The application relates to a chlorination furnace flue gas rinsing device. The device comprises a feeding unit provided with a breathing pipe, a first end of the breathing pipe being connected with a circulating unit, and a second end being communicated with a rinsing tower; The circulating unit is used for containing liquid phase titanium tetrachloride, the breathing pipe is connected with the circulating unit and located above the liquid surface, the circulating unit comprises a circulating tank, an isolation part is arranged in the circulating tank, the isolation part is a baffle vertically arranged in the upper part of the circulating tank, the length of the baffle is 1 / 3-2 / 3 of the height of the circulating tank, and the baffle divides the circulating tank into a first chamber and a second chamber which are communicated at the bottom; The rinsing unit comprises a rinsing tower, a rinsing pipeline and a rinsing circulating pump, one end of the rinsing pipeline is connected with the circulating unit, the other end is connected with the rinsing tower, the rinsing circulating pump is correspondingly arranged in the first chamber and the second chamber of the circulating tank respectively, and each chamber is provided with one rinsing circulating pump; the rinsing device is a four-stage rinsing device, circulating water is used as refrigerant in the first three stages, and frozen salt water is used as refrigerant in the fourth stage, a heat exchanger and a spray head are arranged on the rinsing pipeline, the heat exchanger comprises a refrigerant system, the rinsing tower is provided with a gas phase outlet at the top and a liquid phase outlet at the bottom, and the liquid phase outlet is connected with the circulating unit; The device further comprises a recovery unit communicated with the circulating unit. The rinsing circulating pump is arranged on the rinsing pipeline.

2. A chlorination furnace flue gas water scrubbing device according to claim 1, characterized in that, The circulating unit is provided with a liquid level meter.

3. The chlorination furnace flue gas water scrubber of claim 1 wherein, The application further relates to a chlorination furnace flue gas rinsing device comprising the device as claimed in any one of claims 1-3.

4. A chlorination furnace characterized by ​

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