An oxidation tail gas treatment device in titanium dioxide production

Abstract

The present invention discloses an oxidation tail gas treatment device in titanium dioxide production, belonging to the field of oxidation tail gas treatment, and solves the problem that it is difficult for the second regulating valve in the closed state to achieve no leakage, resulting in a small amount of return chlorine containing high-concentration chlorine passing through the second regulating valve all the time, and the chlorine in it needs to be absorbed by the lye of the oxidation tail gas washing system, objectively causing additional consumption of the lye. It includes a first pipeline connecting an oxidation furnace and a chlorination furnace, and a second pipeline connecting the first pipeline and a washing tower. A first regulating valve is provided on the first pipeline, and a second regulating valve is provided on the second pipeline; a first cut-off valve is further provided on the second pipeline. Due to the high sealing performance of the first cut-off valve in the present invention, the leakage of chlorine can be reduced, and further the loss of lye in the washing tower can be reduced.

Description

Technical Field

[0001] The present invention belongs to the field of oxidation tail gas treatment, and particularly relates to an oxidation tail gas treatment device in titanium dioxide production. Background Art

[0002] High-temperature oxygen and high-temperature titanium tetrachloride are added to an oxidation furnace for reaction to generate semi-finished base material titanium dioxide, and at the same time, oxidation tail gas is produced. The components of the oxidation tail gas are 80% chlorine gas, about 10% nitrogen gas, about 5% oxygen gas, and the rest are HCL, CO2, etc. In the prior art, the oxidation furnace is connected to a chlorination furnace through a first pipeline, the first pipeline is connected to a chlorine washing tower through a second pipeline, a first regulating valve and a second regulating valve are respectively arranged on the first pipeline and the second pipeline, and the two valves are used to control whether the returned chlorine gas goes to the chlorination furnace or the washing tower;

[0003] However, during normal operation (i.e., when chlorine gas is introduced into the chlorination furnace), it is very difficult for the second regulating valve in the closed state to achieve no leakage (since the regulating valve is different from the cut-off valve and there is often a certain amount of gas leakage), resulting in a small amount of returned chlorine gas containing high-concentration chlorine passing through the second regulating valve all the time, and the chlorine gas therein needs to be absorbed by the lye in the oxidation tail gas washing system, objectively causing additional consumption of the lye. Summary of the Invention

[0004] In view of this, the present invention provides an oxidation tail gas treatment device in titanium dioxide production to solve the problem that it is very difficult for the second regulating valve in the closed state in the prior art to achieve no leakage, resulting in a small amount of returned chlorine gas containing high-concentration chlorine passing through the second regulating valve all the time, and the chlorine gas therein needs to be absorbed by the lye in the oxidation tail gas washing system, objectively causing additional consumption of the lye.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An oxidation tail gas treatment device in titanium dioxide production includes a first pipeline connecting the oxidation furnace and the chlorination furnace, and a second pipeline connecting the first pipeline and the washing tower. A first regulating valve is arranged on the first pipeline, and a second regulating valve is arranged on the second pipeline; a first cut-off valve is further arranged on the second pipeline.

[0007] In this technical solution, it should be noted that the first regulating valve and the second regulating valve can be made of materials such as cast iron, cast steel, and stainless steel. Secondly, the regulating valve, also known as the control valve, can change process parameters such as the flow rate, pressure, temperature, and liquid level of the medium. Generally, it consists of an actuator, a valve, and other accessories. The cut-off valve refers to a valve with a leakage rate less than one in a hundred thousand, which has rapidity. It is a special regulating valve that only has the cut-off ability and no regulating function. It has the characteristics of simple structure, sensitive reaction, and reliable operation. The reliability of the cut-off valve in operation depends to a large extent on the correct selection of its structure and materials that fully suit its working conditions, and also depends on the operating conditions. Moreover, the leakage amount of the cut-off valve is extremely small, while that of the regulating valve is relatively large. In summary, in this solution, when chlorine gas is introduced into the chlorination furnace through the first pipeline, the first regulating valve is in the open state, and the second regulating valve and the first cut-off valve are in the closed state. Due to the high sealing performance of the first cut-off valve, the leakage of chlorine gas can be reduced, thereby reducing the loss of the lye in the scrubbing tower.

[0008] Preferably, the first cut-off valve is located on the side of the second regulating valve away from the first pipeline.

[0009] In this technical solution, it should be noted that the oxidation tail gas will contain many titanium dioxide dusts and powders, and the dusts and powders will have a certain impact on the sealing performance of the valve. In view of the fact that the sealing performance of the regulating valve is lower than that of the cut-off valve, therefore, in this solution, the first cut-off valve is arranged downstream of the second pipeline (i.e., on the right side of the second regulating valve), so that a small amount of powder acts on the first cut-off valve after passing through the second regulating valve, that is, the first cut-off valve will not directly contact the powder in the first pipeline, thereby better protecting the first cut-off valve.

[0010] Preferably, it further includes a nitrogen pipeline communicated with the second pipeline. The connection part of the nitrogen pipeline and the second pipeline is located between the second regulating valve and the first cut-off valve, and a second cut-off valve is provided on the nitrogen pipeline.

[0011] In this technical solution, it should be noted that although the first cut-off valve has high sealing performance and extremely small leakage amount, there will still be a leakage situation. That is, when chlorine gas is introduced into the chlorination furnace, a small amount of chlorine gas will still enter the scrubbing tower through the second regulating valve and the first cut-off valve, consuming a part of the lye and causing economic losses. To solve this problem, this solution is provided with a nitrogen pipeline and a second cut-off valve. During normal operation, the staff injects nitrogen gas into the second pipeline between the second regulating valve and the first cut-off valve through the nitrogen pipeline. When the gas pressure between the second regulating valve and the first cut-off valve reaches about 2 bar, the second cut-off valve is closed. At this time, the air pressure difference on both sides of the second regulating valve is almost zero, and there is basically no internal leakage. Even if there is a slight internal leakage in the first cut-off valve and the second cut-off valve, what leaks out is nitrogen gas, and there is basically no situation where high-concentration chlorine gas leaks into the scrubbing tower, making the consumption of the lye basically zero.

[0012] Preferably, the nitrogen gas pipe includes a main pipe and a branch pipe. One end of the main pipe is communicated with the second pipe, a check valve is provided on the main pipe, one end of the branch pipe is communicated with the main pipe, and the other end is communicated with a nitrogen gas tank. The second cut-off valve is provided on the branch pipe.

[0013] In this technical solution, it should be noted that since there is a small amount of titanium dioxide powder in the returned chlorine gas, the check valve provided in this solution can prevent this part of the powder from flowing into the branch pipe to protect the device equipped with the nitrogen gas source.

[0014] Preferably, a first pressure transmitter is provided at one end of the main pipe away from the second pipe. The first pressure transmitter, the first cut-off valve, and the second cut-off valve are all electrically connected to an external DCS control system respectively.

[0015] In this technical solution, it should be noted that the first pressure transmitter provided in this solution is used to monitor the air pressure in the second pipe. When the air pressure in the second pipe does not reach the predetermined value, the first pressure transmitter transmits a signal to the DCS control system, and the DCS control system controls the second cut-off valve to open, so that nitrogen gas is filled into the nitrogen gas pipe and then enters the second pipe. When the air pressure in the second pipe reaches the preset value, the DCS control system controls the second cut-off valve to close. In summary, in this solution, each valve and the first pressure transmitter are electrically connected to the DCS control system, which can achieve the function of automatically regulating the air pressure. Secondly, setting the first pressure transmitter above the check valve can also reduce the influence of titanium dioxide powder on the first pressure transmitter.

[0016] Preferably, the branch pipe is arranged obliquely upward.

[0017] In this technical solution, it should be noted that arranging the branch pipe obliquely upward makes the initial velocity of the gas entering the main pipe from the branch pipe greater, which can form a resistance to the titanium dioxide powder in the main pipe and prevent it from entering the first pressure transmitter. Secondly, since the branch pipe is inclined, nitrogen gas can be quickly introduced into the second pipe, that is, the inflation speed is increased.

[0018] Preferably, a second pressure transmitter is also provided on the first pipe. The second pressure transmitter is electrically connected to the DCS control system.

[0019] In this technical solution, it should be noted that the second pressure transmitter is provided to monitor the air pressure in the first pipeline, and the second pressure transmitter and the first pressure transmitter cooperate with each other to ensure that the air pressures on both sides of the second regulating valve are equal. That is, when the pressure values displayed on the first pressure transmitter and the second pressure transmitter are different, the DCS will control the opening and closing of each valve to control the charging or discharging of nitrogen, and finally make the air pressures on both sides of the second regulating valve equal.

[0020] Preferably, a root valve is provided on the main pipeline, and the root valve is located on the side of the check valve close to the second pipeline.

[0021] In this technical solution, it should be noted that the setting of the root valve mainly facilitates the on-line detection of the check valve and the first pressure transmitter by the staff. That is, when the check valve and the first pressure transmitter fail, the staff can close the root valve to perform on-line detection on the check valve and the first pressure transmitter.

[0022] Preferably, the model of the second pipeline is DN300, the model of the main pipeline is DN50, and the model of the branch pipeline is DN25.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0024] 1. Due to the high sealing performance of the first cut-off valve in the present invention, the leakage of chlorine can be reduced, and thus the loss of lye in the scrubbing tower can be reduced.

[0025] 2. In the present invention, the first cut-off valve is arranged downstream of the second pipeline (i.e., on the right side of the second regulating valve), so that a small amount of powder acts on the first cut-off valve after passing through the second regulating valve. That is, the first cut-off valve does not directly contact the powder in the first pipeline, and thus the first cut-off valve is better protected.

[0026] 3. The present invention is provided with a nitrogen pipeline and a second cut-off valve. Nitrogen is introduced into the second pipeline through the nitrogen pipeline, so that the air pressures on both sides of the second cut-off valve are balanced, and thus the leakage of chlorine can be prevented.

[0027] 4. The check valve provided in the present invention can prevent some powder from flowing into the branch pipeline to protect the device equipped with the nitrogen source.

[0028] 5. In the present invention, each valve, the first pressure transmitter and the DCS control system are electrically connected, which can achieve the function of automatically regulating the air pressure. Secondly, setting the first pressure transmitter above the check valve can also reduce the influence of titanium dioxide powder on the first pressure transmitter.

[0029] 6. The present invention inclines the branch pipeline upward so that the initial velocity of the gas entering the main pipeline from the branch pipeline is greater, which can form a resistance to the titanium dioxide powder in the main pipeline and prevent it from entering the first pressure transmitter. Secondly, since the branch pipeline is inclined, nitrogen can quickly enter the second pipeline, that is, the inflation speed is increased.

[0030] 7. The second pressure transmitter provided in the present invention is used to monitor the air pressure in the first pipeline, and the second pressure transmitter and the first pressure transmitter cooperate with each other to ensure that the air pressures on both sides of the second regulating valve are equal.

[0031] 8. The root valve provided in the present invention facilitates the on-line detection of the check valve and the first pressure transmitter by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described by way of examples with reference to the accompanying drawings, where:

[0033] Figure 1 is a schematic structural diagram of the present invention;

[0034] REFERENCE NUMERALS

[0035] 1 - Oxidation furnace, 2 - Chlorination furnace, 3 - First pipeline, 4 - First regulating valve, 5 - Second pipeline, 6 - Scrubber, 7 - Second regulating valve, 8 - First cut-off valve, 9 - Main pipeline, 10 - Root valve, 11 - Check valve, 12 - Branch pipeline, 13 - Second cut-off valve, 14 - Nitrogen pipeline, 15 - First pressure transmitter, 16 - Second pressure transmitter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0039] It should be noted that like reference numerals and letters denote like items in the following figures. Thus, once an item is defined in one figure, further definition and explanation thereof is not required in subsequent figures.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0043] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0044] Embodiment

[0045] Such as Figure 1As shown in the figure, the present invention provides a device for treating oxidation tail gas in titanium dioxide production, which includes a first pipeline connecting an oxidation furnace and a chlorination furnace, and a second pipeline 5 connecting the first pipeline 3 and a scrubbing tower 6. A first regulating valve 4 is provided on the first pipeline 3, and a second regulating valve 7 is provided on the second pipeline 5; a first cut-off valve 8 is also provided on the second pipeline 5. It should be noted that the first regulating valve 4 and the second regulating valve 7 can be made of materials such as cast iron, cast steel, and stainless steel. Secondly, a regulating valve is also known as a control valve, which can change process parameters such as the flow rate, pressure, temperature, and liquid level of the medium. Generally, it consists of an actuator, a valve, and other accessories. A cut-off valve refers to a valve with a leakage rate less than one in one hundred thousand, which has rapidity. It is a special regulating valve that only has a cut-off ability and no regulating function, and has the characteristics of simple structure, sensitive reaction, and reliable operation. The reliability of the cut-off valve in operation depends to a large extent on the correct selection of its structure and materials that are fully suitable for its working conditions, and on the operating conditions; and the leakage amount of the cut-off valve is extremely small, while the leakage amount of the regulating valve is relatively large. In summary, in this solution, when chlorine gas is introduced into the chlorination furnace 2 through the first pipeline 3, the first regulating valve 4 is in the open state, and the second regulating valve 7 and the first cut-off valve 8 are in the closed state. Due to the high sealing performance of the first cut-off valve 8, the leakage of chlorine gas can be reduced, and thus the loss of the alkali solution in the scrubbing tower 6 can be reduced.

[0046] As Figure 1 shown, in one embodiment, the first cut-off valve 8 is located on the side of the second regulating valve 7 away from the first pipeline 3. It should be noted that the oxidation tail gas will contain a lot of titanium dioxide dust and powder, and the dust and powder will have a certain impact on the sealing performance of the valve; in view of the fact that the sealing performance of the regulating valve is lower than that of the cut-off valve, therefore, in this solution, the first cut-off valve 8 is arranged downstream of the second pipeline 5 (i.e., on the right side of the second regulating valve 7), so that a small amount of powder acts on the first cut-off valve 8 after passing through the second regulating valve 7, that is, the first cut-off valve 8 does not directly contact the powder in the first pipeline 3, thus better protecting the first cut-off valve 8.

[0047] As Figure 1As shown, in one embodiment, it further includes a nitrogen pipe 14 communicating with the second pipe 5. The connection of the nitrogen pipe 14 and the second pipe 5 is located between the second regulating valve 7 and the first cut-off valve 8, and a second cut-off valve 13 is provided on the nitrogen pipe 14. It should be noted that although the first cut-off valve 8 has high sealing performance and extremely small leakage, there will still be a leakage situation. That is, when chlorine gas is introduced into the chlorination furnace 2, a small amount of chlorine gas will still enter the scrubbing tower 6 through the second regulating valve 7 and the first cut-off valve 8, consuming a part of the lye and causing economic losses. To solve this problem, this solution is provided with a nitrogen pipe 14 and a second cut-off valve 13. During normal operation, the staff passes nitrogen through the nitrogen pipe 14 into the second pipe 5 between the second regulating valve 7 and the first cut-off valve 8. When the gas pressure between the second regulating valve 7 and the first cut-off valve 8 reaches about 2 bar, the second cut-off valve 13 is closed. At this time, the air pressure difference on both sides of the second regulating valve 7 is almost zero, and there is basically no internal leakage. Even if there is a slight internal leakage in the first cut-off valve 8 and the second cut-off valve 13, the leaked gas is nitrogen, and there is basically no situation where high-concentration chlorine gas leaks into the scrubbing tower 6, making the consumption of lye basically zero.

[0048] As Figure 1 shown, in one embodiment, the nitrogen pipe 14 includes a main pipe 9 and a branch pipe 12. One end of the main pipe 9 communicates with the second pipe 5, a check valve 11 is provided on the main pipe 9, one end of the branch pipe 12 communicates with the main pipe 9, and the other end communicates with a nitrogen tank. The second cut-off valve 13 is provided on the branch pipe 12. It should be noted that since there is a small amount of titanium dioxide powder in the returned chlorine gas, the check valve 11 provided in this solution can prevent this part of the powder from flowing into the branch pipe 12 to protect the device equipped with a nitrogen source.

[0049] As Figure 1 shown, in one embodiment, a first pressure transmitter 15 is provided at one end of the main pipe 9 away from the second pipe 5. The first pressure transmitter 15, the first cut-off valve 8, and the second cut-off valve 13 are all electrically connected to an external DCS control system respectively. It should be noted that the first pressure transmitter 15 provided in this solution is used to monitor the air pressure in the second pipe 5. When the air pressure in the second pipe 5 does not reach the predetermined value, the first pressure transmitter 15 transmits a signal to the DCS control system, and the DCS control system controls the second cut-off valve 13 to open, so that nitrogen is filled into the nitrogen pipe 14 and then enters the second pipe 5. When the air pressure in the second pipe 5 reaches the preset value, the DCS control system controls the second cut-off valve 13 to close; In summary, in this solution, each valve and the first pressure transmitter 15 are electrically connected to the DCS control system, which can achieve the function of automatically regulating the air pressure. Secondly, setting the first pressure transmitter 15 above the check valve 11 can also reduce the influence of titanium dioxide powder on the first pressure transmitter 15.

[0050] As Figure 1 shown, in one embodiment, the branch pipe 12 is arranged obliquely upward. It should be noted that arranging the branch pipe 12 obliquely upward makes the initial velocity of the gas entering the main pipe 9 from the branch pipe 12 greater, which can form a resistance to the titanium dioxide powder in the main pipe 9 and prevent it from entering the first pressure transmitter 15; secondly, since the branch pipe 12 is inclined, nitrogen can be quickly introduced into the second pipe 5, that is, the inflation speed is increased.

[0051] As Figure 1 shown, in one embodiment, a second pressure transmitter 16 is further provided on the first pipe 3, and the second pressure transmitter 16 is electrically connected to the DCS control system. It should be noted that the second pressure transmitter 16 is provided to monitor the air pressure in the first pipe 3, and the second pressure transmitter 16 and the first pressure transmitter 15 cooperate with each other to ensure that the air pressures on both sides of the second regulating valve 7 are equal, that is, when the pressure value displayed on the first pressure transmitter 15 is different from the pressure value displayed on the second pressure transmitter 16, the DCS will control the opening and closing of each valve to control the charging or discharging of nitrogen, and finally make the air pressures on both sides of the second regulating valve 7 equal.

[0052] As Figure 1 shown, in one embodiment, a root valve 10 is provided on the main pipe 9, and the root valve 10 is located on the side of the check valve 11 close to the second pipe 5. It should be noted that the setting of the root valve 10 is mainly to facilitate the on-line detection of the check valve 11 and the first pressure transmitter 15 by the staff, that is, when the check valve 11 and the first pressure transmitter 15 fail, the staff can close the root valve 10 to perform on-line detection on the check valve 11 and the first pressure transmitter 15.

[0053] Preferably, the model of the second pipe 5 is DN300, the model of the main pipe 9 is DN50, and the model of the branch pipe 12 is DN25.

[0054] The specific working principle of the present invention is as follows: When chlorine is charged into the chlorination furnace 2, the first regulating valve 4 is opened, the second regulating valve 7 and the first cut-off valve 8 are closed, the first pressure transmitter 15 detects the air pressure in the second pipe 5, and the second pressure transmitter 16 detects the air pressure in the first pipe 3. When the detection value of the first pressure transmitter 15 is lower than that of the first pressure transmitter 15, the DCS control system controls the second cut-off valve 13 to open, so that the nitrogen in the nitrogen tank enters the second pipe 5 (and between the second regulating valve 7 and the first cut-off valve 8) after passing through the branch pipe 12 and the main pipe 9. When the pressures on both sides of the second regulating valve 7 are equal, the DCS control system controls the second cut-off valve 13 to close.

[0055] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0056] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oxidation tail gas treatment device in titanium dioxide production, Characterized in that, It includes a first pipeline (3) connecting an oxidation furnace (1) and a chlorination furnace (2), and a second pipeline (5) connecting the first pipeline (3) and a scrubbing tower (6). A first regulating valve (4) is provided on the first pipeline (3), and a second regulating valve (7) is provided on the second pipeline (5); a first cut-off valve (8) is also provided on the second pipeline (5); The first cut-off valve (8) is located on the side of the second regulating valve (7) away from the first pipeline (3); It also includes a nitrogen pipeline connected to the second pipeline (5). The connection point of the nitrogen pipeline and the second pipeline (5) is located between the second regulating valve (7) and the first cut-off valve (8). A second cut-off valve (13) is provided on the nitrogen pipeline; The nitrogen pipeline includes a main pipeline (9) and a branch pipeline (12). One end of the main pipeline (9) is connected to the second pipeline (5). A check valve (11) is provided on the main pipeline (9). One end of the branch pipeline (12) is connected to the main pipeline (9), and the other end is connected to a nitrogen tank (14). The second cut-off valve (13) is provided on the branch pipeline (12).

2. The oxidation tail gas treatment device in titanium dioxide production according to claim 1, Characterized in that, A first pressure transmitter (15) is provided at one end of the main pipeline (9) away from the second pipeline (5). The first pressure transmitter (15) and the second cut-off valve (13) are both electrically connected to an external DCS control system.

3. The oxidation tail gas treatment device in titanium dioxide production according to claim 1, Characterized in that, The branch pipeline (12) is arranged obliquely upward.

4. The oxidation tail gas treatment device in titanium dioxide production according to claim 1, Characterized in that, A second pressure transmitter (16) is also provided on the first pipeline (3). The second pressure transmitter (16) is electrically connected to the DCS control system.

5. The oxidation tail gas treatment device in titanium dioxide production according to claim 2, Characterized in that, A root valve (10) is provided on the main pipeline (9). The root valve (10) is located on the side of the check valve (11) close to the second pipeline (5).

6. The oxidation tail gas treatment device in titanium dioxide production according to claim 1, Characterized in that, The model of the second pipeline (5) is DN300, the model of the main pipeline (9) is DN50, and the model of the branch pipeline (12) is DN25.

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