Device and method for monitoring chlorine reaction condition in chlorination furnace

Abstract

The invention relates to the technical field of chlorination furnace equipment, in particular to a device and method for monitoring the reaction condition of chlorine in a chlorination furnace, and the device comprises a titanium tetrachloride liquid supplementing tank, a chlorine absorption tank, a titanium tetrachloride liquid discharging tank and a sucking pump; the titanium tetrachloride liquid supplementing tank is connected with a liquid inlet of the chlorine gas absorption tank through a liquid supplementing pipe; the chlorine absorption tank is connected with an online color measuring instrument; the titanium tetrachloride liquid discharge tank is connected with a liquid outlet of the chlorine gas absorption tank through a liquid discharge pipe; the air inlet end of the air extracting pump is connected with the front end of the tail gas pipe. According to the device and the method for monitoring the chlorine reaction condition in the chlorination furnace, the titanium tetrachloride liquid supplementing tank is used for continuously supplementing liquid into the chlorine absorption tank, tail gas in the tail gas pipe is extracted in real time for chlorine absorption, and the chromaticity of titanium tetrachloride is continuously detected in cooperation with the online color measuring instrument, so that the continuous and automatic monitoring of the chlorine reaction condition in the chlorination furnace is realized. Compared with the traditional starch potassium iodide solution, the pure titanium tetrachloride serving as the absorbent is lower in cost and simpler in recovery treatment.

Description

Technical Field

[0001] The invention relates to the technical field of chlorination furnace equipment, in particular to a device and method for monitoring chlorine reaction conditions in a chlorination furnace. Background Art

[0002] In the production process of the chlorination furnace, titanium tetrachloride is a key intermediate raw material for the production of titanium dioxide and titanium sponge. Its preparation process involves complex reactions of multiple raw materials under high temperature conditions. However, due to the instability of raw material supply and fluctuations in the conditions of the chlorination furnace, the chlorine gas put into the chlorination furnace sometimes reacts incompletely. This causes the unreacted chlorine gas to enter the subsequent dust collection, leaching condensation and tail gas washing system along with the crude titanium tetrachloride vapor, which not only affects the effect of refined vanadium removal, but also may cause the tail gas spray liquid to quickly fail, thereby causing environmental problems such as unqualified tail gas emissions.

[0003] At present, the monitoring of chlorine gas reaction in chlorination furnace mainly relies on simple chemical methods, such as using starch potassium iodide solution to absorb tail gas and observing color changes to determine whether chlorine is permeable. However, this method has many shortcomings, including pollution caused by hydrolysis of titanium tetrachloride gas, cumbersome manual liquid preparation and liquid replacement operations, etc. Therefore, a more effective and continuous device and method for monitoring chlorine gas reaction in chlorination furnace is urgently needed to improve production efficiency, reduce environmental pollution, and ensure the compliance of tail gas emissions. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for monitoring the reaction of chlorine in a chlorination furnace, so as to solve the problem that the monitoring of the reaction of chlorine in a chlorination furnace proposed in the above background technology mainly relies on simple chemical methods, such as using starch potassium iodide solution to absorb tail gas and observe color changes to determine whether chlorine is permeable. However, this method has many shortcomings, including pollution caused by hydrolysis of titanium tetrachloride gas, cumbersome manual liquid preparation and liquid replacement operations, etc.

[0005] To achieve the above-mentioned purpose, the present invention provides a device for monitoring the chlorine reaction in a chlorination furnace, comprising a titanium tetrachloride replenishing tank, a chlorine absorption tank, a titanium tetrachloride drainage tank and an exhaust pump; the titanium tetrachloride replenishing tank is connected to the liquid inlet of the chlorine absorption tank through a replenishing pipe; the chlorine absorption tank is connected to an online colorimetric instrument; the titanium tetrachloride drainage tank is connected to the liquid outlet of the chlorine absorption tank through a drainage pipe; the air inlet end of the exhaust pump is connected to the front end of a tail gas pipe, the air outlet end of the exhaust pump is connected to the air inlet of the chlorine absorption tank; the air outlet of the chlorine absorption tank is connected to the rear end of the tail gas pipe.

[0006] As a preferred solution of the present invention, a first pneumatic valve is installed on the infusion pipe, and a second pneumatic valve is installed on the drainage pipe.

[0007] As a preferred embodiment of the present invention, the tail gas pipe is located between the leaching and condensing system and the tail gas washing system, with the front end connected to the leaching and condensing system and the rear end connected to the tail gas washing system. The front end of the leaching and condensing system is connected to the dust collection system, and the front end of the dust collection system is connected to the chlorination furnace.

[0008] As a preferred embodiment of the present invention, the bottom discharge pipeline of the elution condensation system is connected to a first collecting tank, one side of the first collecting tank is connected to a refining treatment system, and the tail end of the refining treatment system is connected to a second collecting tank.

[0009] As a preferred embodiment of the present invention, the chlorine gas absorption tank first receives a fixed volume of pure titanium tetrachloride from the titanium tetrachloride replenishment tank, and then extracts the tail gas through a vacuum pump for absorption.

[0010] As a preferred embodiment of the present invention, the online colorimetric instrument installed on the chlorine gas absorption tank is used to continuously detect the chromaticity of titanium tetrachloride and transmit the chromaticity value signal back to the external control room.

[0011] As a preferred embodiment of the present invention, titanium tetrachloride saturated with chlorine is discharged from the liquid outlet of the chlorine absorption tank, and the discharge is controlled by the second pneumatic valve to the titanium tetrachloride liquid discharge tank, and pure titanium tetrachloride is supplemented through the titanium tetrachloride liquid replenishment tank.

[0012] As a preferred embodiment of the present invention, the gas that cannot be completely absorbed by the chlorine gas absorption tank is discharged to the rear end of the tail gas pipe through the gas outlet and is processed by the tail gas washing system.

[0013] As a preferred embodiment of the present invention, the liquid contained in the titanium tetrachloride replenishing tank is refined colorless, transparent, pure titanium tetrachloride.

[0014] The present invention also provides a method for monitoring the reaction of chlorine in a chlorination furnace, and a device for monitoring the reaction of chlorine in a chlorination furnace, comprising the following steps:

[0015] S1, allowing the pure titanium tetrachloride in the titanium tetrachloride replenishment tank to flow into the chlorine gas absorption tank to a specified liquid level;

[0016] S2, extracting the tail gas in the tail pipe into the chlorine absorption tank, and the gas that cannot be absorbed returns to the rear end of the tail pipe;

[0017] S3, the online color measuring instrument detects the color of titanium tetrachloride in the chlorine absorption tank and transmits the data back to the main control system;

[0018] S4. Determine whether the chlorination furnace is permeable to chlorine and the severity of the permeation according to the change in chromaticity;

[0019] S5, absorbing the chlorine-saturated titanium tetrachloride and discharging it into the titanium tetrachloride liquid discharge tank, and replenishing pure titanium tetrachloride;

[0020] Among them, the titanium tetrachloride replenishment tank continuously replenishes liquid to the chlorine absorption tank, and at the same time, the chlorine absorption tank continuously discharges liquid to the titanium tetrachloride discharge tank, keeping the liquid level unchanged and realizing continuous monitoring.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the device and method for monitoring the chlorine reaction in the chlorination furnace, the chlorine absorption tank is continuously replenished with liquid through the titanium tetrachloride replenishing tank, and the tail gas in the tail gas pipe is extracted in real time to absorb the chlorine, and the color of titanium tetrachloride is continuously detected with an online colorimetric instrument, thereby realizing continuous and automatic monitoring of the chlorine reaction in the chlorination furnace.

[0023] 2. In the device and method for monitoring the chlorine reaction in the chlorination furnace, compared with the traditional starch potassium iodide solution, pure titanium tetrachloride as an absorbent is not only lower in cost and simpler to recycle, but also has a gradual color change, which can more accurately reflect the concentration change of chlorine and improve the accuracy and sensitivity of monitoring.

[0024] 3. In the device and method for monitoring the chlorine reaction in the chlorination furnace, automatic liquid replacement and liquid replenishment operations are realized through the control of the first pneumatic valve and the second pneumatic valve, which greatly saves labor costs and improves production efficiency.

[0025] 4. The device and method for monitoring the chlorine reaction in the chlorination furnace avoid the pollution problem caused by the hydrolysis of titanium tetrachloride gas, while ensuring the compliance of tail gas emissions and reducing the impact on the environment. It can not only determine whether the chlorination furnace is permeable to chlorine, but also determine the severity of chlorine permeability based on color changes, providing operators with comprehensive chlorine reaction information, which helps to adjust the working status of the chlorination furnace in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the present invention connected to a chlorination furnace;

[0028] The meaning of each number in the figure is:

[0029] 1. Titanium tetrachloride replenishing tank; 2. First pneumatic valve; 3. Liquid inlet; 4. Air outlet; 5. Online colorimetric instrument; 6. Second pneumatic valve; 7. Titanium tetrachloride drain tank; 8. Air inlet; 9. Vacuum pump; 10. Liquid outlet; 11. Tail gas pipe; 12. Chlorine absorption tank; 13. Chlorination furnace; 14. Dust collection system; 15. Leaching and condensing system; 16. Tail gas washing system; 17. First collecting tank; 18. Refining treatment system; 19. Second collecting tank. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a device for monitoring the reaction of chlorine in a chlorination furnace, such as Figure 1-Figure 2 As shown, it includes a titanium tetrachloride replenishment tank 1, a chlorine absorption tank 12, a titanium tetrachloride drainage tank 7, and an air pump 9; the titanium tetrachloride replenishment tank 1 is connected to the liquid inlet 3 of the chlorine absorption tank 12 through a replenishment pipe; the chlorine absorption tank 12 is connected with an online color measuring instrument 5; the titanium tetrachloride drainage tank 7 is connected to the liquid outlet 10 of the chlorine absorption tank 12 through a drainage pipe; the air inlet end of the air pump 9 is connected to the front end of the tail gas pipe 11, and the air outlet end of the air pump 9 is connected to the air inlet 8 of the chlorine absorption tank 12; the air outlet 4 of the chlorine absorption tank 12 is connected to the rear end of the tail gas pipe 11. Stable replenishment between the titanium tetrachloride replenishment tank 1 and the chlorine absorption tank 12 is achieved, ensuring that there is enough pure titanium tetrachloride in the chlorine absorption tank 12 for absorbing chlorine in the tail gas. By connecting the online color measuring instrument 5 to the chlorine absorption tank 12, real-time detection of the color of titanium tetrachloride in the absorption tank is achieved, and the reaction of chlorine in the chlorination furnace can be accurately judged. The setting of the vacuum pump 9 ensures that the tail gas in the tail gas pipe 11 can be effectively extracted and sent to the chlorine absorption tank 12 for chlorine absorption, and the gas that cannot be absorbed can also be smoothly returned to the rear end of the tail gas pipe 11 for further treatment. The titanium tetrachloride drainage tank 7 is connected to the liquid outlet 10 of the chlorine absorption tank 12, realizing the timely discharge of the saturated titanium tetrachloride, and ensuring the continuous and effective operation of the chlorine absorption tank 12.

[0032] In this embodiment, a first pneumatic valve 2 is installed on the liquid infusion pipe, and a second pneumatic valve 6 is installed on the liquid discharge pipe, so as to facilitate the control of liquid infusion and liquid discharge operations.

[0033] Specifically, the tail gas pipe 11 is located between the leaching and condensing system 15 and the tail gas washing system 16, with the front end connected to the leaching and condensing system 15 and the rear end connected to the tail gas washing system 16. The front end of the leaching and condensing system 15 is connected to the dust collecting system 14, and the front end of the dust collecting system 14 is connected to the chlorination furnace 13, so as to facilitate the monitoring and processing operations of the tail gas of the chlorination furnace 13.

[0034] Furthermore, the bottom discharge pipeline of the elution condensation system 15 is connected to the first collecting tank 17, one side of the first collecting tank 17 is connected to the refining treatment system 18, and the tail end of the refining treatment system 18 is connected to the second collecting tank 19, which is convenient for subsequent material collection and refining operations. In addition, the conventional structure of the prior art will not be described in detail here.

[0035] Furthermore, the chlorine absorption tank 12 first receives a fixed volume of pure titanium tetrachloride from the titanium tetrachloride replenishment tank 1, and then extracts tail gas for absorption through the vacuum pump 9. It is ensured that there is sufficient pure titanium tetrachloride as an absorbent before each absorption operation, providing a stable basis for subsequent tail gas absorption.

[0036] Furthermore, the online colorimetric instrument 5 installed on the chlorine absorption tank 12 is used to continuously detect the chromaticity of titanium tetrachloride and transmit the chromaticity value signal back to the external control room. The ability to continuously and in real time detect the chromaticity of titanium tetrachloride and transmit the chromaticity value signal back to the external control room provides the operator with accurate chlorine reaction monitoring data, which helps to adjust the working state of the chlorination furnace in a timely manner.

[0037] Furthermore, the titanium tetrachloride saturated with chlorine is discharged from the liquid outlet 10 of the chlorine absorption tank 12, and the second pneumatic valve 6 controls the discharge to the titanium tetrachloride discharge tank 7, and the titanium tetrachloride replenishment tank 1 replenishes pure titanium tetrachloride. Effective treatment and recovery of saturated titanium tetrachloride is achieved. At the same time, the titanium tetrachloride replenishment tank 1 can replenish pure titanium tetrachloride in time, ensuring the continuous and effective operation of the chlorine absorption tank 12.

[0038] Furthermore, the gas that cannot be completely absorbed by the chlorine absorption tank 12 is discharged to the rear end of the tail gas pipe 11 through the gas outlet 4 and processed by the tail gas washing system 16, thereby ensuring sufficient purification and environmentally friendly discharge of the tail gas.

[0039] Furthermore, the liquid contained in the titanium tetrachloride replenishment tank 1 is refined colorless, transparent, pure titanium tetrachloride, which ensures the quality and purity of the replenishment liquid and helps to improve the effect and accuracy of chlorine absorption.

[0040] The present invention also provides a method for monitoring the reaction of chlorine in a chlorination furnace, and a device for monitoring the reaction of chlorine in a chlorination furnace, comprising the following steps:

[0041] S1, allowing the pure titanium tetrachloride in the titanium tetrachloride replenishment tank 1 to flow into the chlorine gas absorption tank 12 to a specified liquid level;

[0042] S2, extracting the tail gas in the tail gas pipe 11 into the chlorine gas absorption tank 12, and the gas that cannot be absorbed returns to the rear end of the tail gas pipe 11;

[0043] S3, the online color measuring instrument 5 detects the color of titanium tetrachloride in the chlorine absorption tank 12, and transmits the data back to the main control system;

[0044] S4, judging whether the chlorination furnace 13 is permeable to chlorine and the severity of the permeability to chlorine according to the change in chromaticity;

[0045] S5, the titanium tetrachloride saturated with chlorine is discharged into the titanium tetrachloride drainage tank 7, and pure titanium tetrachloride is added;

[0046] The titanium tetrachloride replenishing tank 1 continuously replenishes the chlorine gas absorption tank 12, and the chlorine gas absorption tank continuously discharges the liquid to the titanium tetrachloride liquid discharge tank 7, so as to keep the liquid level unchanged and realize continuous monitoring.

[0047] Comparative Example 1:

[0048] Close the air inlet 8, air outlet 4 and liquid outlet 10 of the chlorine gas absorption tank 12, open the liquid inlet 3, and allow the pure titanium tetrachloride in the titanium tetrachloride replenishment tank 1 to flow into the chlorine gas absorption tank 12. When the specified liquid level is reached, close the liquid inlet, and the online colorimeter 5 is automatically zeroed.

[0049] The air inlet 8 and the air outlet 4 are opened, and the exhaust pump 9 extracts the tail gas in the tail pipe 11 into the chlorine absorption tank 12, and the gas that cannot be absorbed returns to the rear end of the tail pipe 11 through the air outlet 4.

[0050] The online colorimeter 5 detects the color of titanium tetrachloride in the absorption tank 12 and transmits the data back to the main control. The chromaticity curve is observed. The chromaticity rises by 5 degrees in 10 hours, and it is judged that no chlorine permeation occurs during this period.

[0051] Comparative Example 2:

[0052] Close the air inlet 8, air outlet 4 and liquid outlet 10 of the chlorine gas absorption tank 12, open the liquid inlet 3, and allow the pure titanium tetrachloride in the titanium tetrachloride replenishment tank 1 to flow into the chlorine gas absorption tank 12. When the specified liquid level is reached, close the liquid inlet, and the online colorimeter 5 is automatically zeroed.

[0053] The air inlet 8 and the air outlet 4 are opened, and the exhaust pump 9 extracts the tail gas in the tail pipe 11 into the chlorine absorption tank 12, and the gas that cannot be absorbed returns to the rear end of the tail pipe 11 through the air outlet 4.

[0054] The online colorimeter 5 detects the color of titanium tetrachloride in the absorption tank 12 and transmits the data back to the main control. The chromaticity curve is observed. The chromaticity rises by 40 degrees in half an hour. It is judged that chlorine permeation occurs during this period. The production needs to adjust the material ratio of the chlorination furnace 13. At the same time, the tail gas washing needs to change the liquid frequently to prevent the tail gas from being washed uncleanly.

[0055] The air inlet 8 and the air outlet 4 of the chlorine absorption tank 12 are closed, and the drain port 10 is opened to discharge the saturated titanium tetrachloride into the titanium tetrachloride drain tank 7.

[0056] Follow the steps 1, 2, 3, and 4 to complete a cycle of pure titanium tetrachloride rehydration, chlorine absorption, colorimetry detection, and liquid discharge.

[0057] Comparative Example 3:

[0058] Open (the original text here is "open and close", which should be a typo, so it is corrected to "open") the air inlet 8, air outlet 4 and liquid outlet 10 of the chlorine absorption tank 12, open the liquid inlet 3, and allow the pure titanium tetrachloride in the titanium tetrachloride replenishing tank 1 to flow into the chlorine absorption tank 12. After reaching the specified liquid level, close the liquid inlet, and the online color measuring instrument 5 automatically calibrates to zero.

[0059] Open the liquid inlet 3 and the liquid outlet 10, continuously inlet and outlet the liquid, adjust the inlet and outlet flow rates to make the inlet and outlet flow rates consistent, and ensure that the liquid level height remains unchanged.

[0060] The air inlet 8 and the air outlet 4 are opened to allow the tail gas to enter the absorption tank 12 , and the gas that cannot be absorbed returns to the rear end of the tail gas pipe 11 through the air outlet 4 .

[0061] This is a continuous monitoring state. If the chlorine permeation is slight, the chromaticity will slowly increase and fluctuate within a chromaticity value range (about 20 degrees); if the chlorine permeation is severe, the chromaticity will rise rapidly (close to 40 degrees); if the chlorine permeation improves, with continuous liquid replacement, the chromaticity value will slowly decrease until it approaches zero.

[0062] Finally, it should be noted that the online color measuring instrument 5 in this embodiment, the electronic components in the above-mentioned parts are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires respectively, and the specific connection means should refer to the working sequence between the electrical components in the above-mentioned working principle to complete the electrical connection, which are all well-known technologies in the art.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for monitoring the reaction of chlorine in a chlorination furnace, characterized in that: The invention comprises a titanium tetrachloride liquid replenishing tank (1), a chlorine gas absorption tank (12), a titanium tetrachloride liquid discharge tank (7), and an air pump (9); the titanium tetrachloride liquid replenishing tank (1) is connected to a liquid inlet (3) of a chlorine gas absorption tank (12) through a liquid replenishing pipe; the chlorine gas absorption tank (12) is connected to an online colorimetric instrument (5); the titanium tetrachloride liquid discharge tank (7) is connected to a liquid outlet (10) of the chlorine gas absorption tank (12) through a liquid discharge pipe; the air inlet end of the air pump (9) is connected to a front end of a tail gas pipe (11), and the air outlet end of the air pump (9) is connected to an air inlet (8) of the chlorine gas absorption tank (12); and the air outlet (4) of the chlorine gas absorption tank (12) is connected to a rear end of the tail gas pipe (11).

2. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 1, wherein: A first pneumatic valve (2) is installed on the liquid infusion pipe, and a second pneumatic valve (6) is installed on the liquid discharge pipe.

3. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 1, wherein: The tail gas pipe (11) is located between the leaching and condensing system (15) and the tail gas washing system (16), with a front end connected to the leaching and condensing system (15) and a rear end connected to the tail gas washing system (16). The front end of the leaching and condensing system (15) is connected to the dust collecting system (14), and the front end of the dust collecting system (14) is connected to the chlorination furnace (13).

4. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 3, wherein: The bottom discharge pipeline of the elution and condensation system (15) is connected to a first collection tank (17), one side of the first collection tank (17) is connected to a refining treatment system (18), and the tail end of the refining treatment system (18) is connected to a second collection tank (19).

5. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 1, wherein: The chlorine gas absorption tank (12) first receives a fixed volume of pure titanium tetrachloride from the titanium tetrachloride replenishment tank (1), and then extracts tail gas through a vacuum pump (9) for absorption.

6. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 1, wherein: The online colorimetric instrument (5) installed on the chlorine gas absorption tank (12) is used to continuously detect the chromaticity of titanium tetrachloride and transmit the chromaticity value signal back to the external control room.

7. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 1, characterized in that: The titanium tetrachloride saturated with chlorine is discharged from the liquid outlet (10) of the chlorine absorption tank (12), and the discharge is controlled by the second pneumatic valve (6) to the titanium tetrachloride liquid discharge tank (7), and pure titanium tetrachloride is supplemented through the titanium tetrachloride liquid replenishment tank (1).

8. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 3, characterized in that: The gas that is not completely absorbed by the chlorine absorption tank (12) is discharged to the rear end of the tail gas pipe (11) through the gas outlet (4) and is processed by the tail gas washing system (16).

9. The device for monitoring the reaction of chlorine in a chlorination furnace according to claim 1, characterized in that: The liquid contained in the titanium tetrachloride replenishing tank (1) is refined colorless, transparent, pure titanium tetrachloride.

10. A method for monitoring the reaction of chlorine in a chlorination furnace, used in the device for monitoring the reaction of chlorine in a chlorination furnace according to any one of claims 1 to 9, characterized in that: The steps include: S1, allowing the pure titanium tetrachloride in the titanium tetrachloride replenishment tank (1) to flow into the chlorine gas absorption tank (12) to a specified liquid level; S2, extracting the tail gas in the tail gas pipe (11) into the chlorine gas absorption tank (12), and returning the gas that has not been absorbed to the rear end of the tail gas pipe (11); S3, an online color measuring instrument (5) detects the color of titanium tetrachloride in the chlorine absorption tank (12) and transmits the data back to the main control system; S4, judging whether the chlorination furnace (13) is permeable to chlorine and the severity of the permeability to chlorine according to the change in chromaticity; S5, the titanium tetrachloride saturated with chlorine is discharged into the titanium tetrachloride drainage tank (7), and pure titanium tetrachloride is added; The titanium tetrachloride replenishing tank (1) continuously replenishes liquid to the chlorine gas absorption tank (12), and the chlorine gas absorption tank continuously discharges liquid to the titanium tetrachloride liquid discharge tank (7), so that the liquid level is kept constant and continuous monitoring is achieved.

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