Titanium tetrachloride cooling system and titanium tetrachloride production system

Abstract

The application relates to a titanium tetrachloride production technology, and discloses a titanium tetrachloride cooling system and a titanium tetrachloride production system. The cooling system comprises a quench tower, a staged spraying device arranged in the quench tower, and a distance control device connected with the staged spraying device; the staged spraying device comprises at least two spraying gun assemblies arranged along the height direction of the quench tower in sequence, and each spraying gun assembly is connected with a cold titanium tetrachloride supply source through a pipeline; the distance control device comprises a temperature acquisition assembly, a main controller and a corresponding adjusting valve opening degree control loop of each spraying gun assembly; the adjusting valve opening degree control loop comprises a first adjusting valve used for adjusting the supply amount of the cold titanium tetrachloride; the main controller is used for generating a control signal according to the collector outlet temperature collected by the temperature acquisition assembly; and each adjusting valve opening degree control loop is configured to open the corresponding first adjusting valve according to the preset signal interval of the control signal, so as to adjust the spraying amount of the corresponding spraying gun assembly.

Description

Technical Field

[0001] This application relates to the field of titanium tetrachloride production technology, and in particular to a titanium tetrachloride cooling system and a titanium tetrachloride production system. Background Technology

[0002] In the chlorination process for producing titanium and titanium compounds, the high-temperature titanium tetrachloride gas discharged from the chlorination furnace needs to be rapidly cooled to 170℃~220℃ in a quench tower for subsequent condensation and separation. Existing cooling systems mostly employ a single spray method, controlling the spray volume by adjusting valve openings. This is difficult to adapt to fluctuations in flue gas load, easily leading to problems such as unstable outlet temperature, localized overcooling, or insufficient cooling. Because crude titanium tetrachloride contains impurities and is prone to hydrolysis, the spray guns are highly susceptible to crystallization and blockage under low flow rates or when not in use, thus affecting the continuous operation of the system. Utility Model Content

[0003] In view of this, embodiments of this application provide a titanium tetrachloride cooling system and a titanium tetrachloride production system.

[0004] In a first aspect, embodiments of this application provide a titanium tetrachloride cooling system, comprising: a quench tower, a staged spray device disposed within the quench tower, and a range control device connected to the staged spray device; The graded spraying device includes at least two spray gun assemblies arranged sequentially along the height direction of the quench tower, and each spray gun assembly is connected to a cold titanium tetrachloride supply source via a pipeline. The split-range control device includes a temperature acquisition component, a main controller, and a regulating valve opening control loop corresponding to each of the spray gun components; each regulating valve opening control loop includes a first regulating valve for regulating the supply of cold titanium tetrachloride. The main controller is connected to the temperature acquisition component and is used to generate a control signal based on the collector outlet temperature acquired by the temperature acquisition component. Each of the regulating valve opening control loops is configured to open the first regulating valve on the corresponding regulating valve opening control loop according to the preset signal range in which the control signal is located, so as to adjust the spray volume of the corresponding spray gun assembly.

[0005] In an optional embodiment, each of the spray gun assemblies is also connected to a protective gas supply source via a pipe; The regulating valve opening control loop also includes a second regulating valve for regulating the supply of protective gas and a switching valve for switching between the cold titanium tetrachloride passage and the protective gas passage. The cold titanium tetrachloride supply source is connected in sequence to the first regulating valve and the switching valve through pipelines, and is also connected to the corresponding spray gun assembly; The protective gas supply source is connected in sequence to the pipeline between the second regulating valve, the switching valve and the quench tower via pipelines.

[0006] In an optional embodiment, the nozzles of the spray gun assembly located at the bottom of the quench tower are arranged facing upwards; the nozzles of the remaining spray gun assemblies are arranged facing downwards.

[0007] In an optional embodiment, the orientation of each of the nozzles is set at an angle of 30 to 60 degrees to the wall of the quench tower; In an optional embodiment, the nozzle is an atomizing nozzle.

[0008] In an optional implementation, the plurality of preset signal intervals are distributed sequentially according to the output strength of the control signal of the main controller, and there are overlapping signal segments between adjacent preset signal intervals.

[0009] In an optional embodiment, the graded spraying device includes four spray gun assemblies arranged sequentially along the height direction of the quench tower; The lowest position of the spray gun assembly corresponds to the preset signal range with the lowest output intensity, and the highest position of the spray gun assembly corresponds to the preset signal range with the highest output intensity. The first regulating valve corresponding to each of the spray gun assemblies is configured to open step by step according to the increase of the signal output strength of the main controller, so as to adjust the spray volume of the corresponding spray gun assembly, and remain open after the signal output strength increases.

[0010] In an optional embodiment, the protective gas is an inert gas; the regulating valve opening control loop further includes a flow meter; the second regulating valve and the flow meter constitute a protective gas control loop for monitoring and regulating the flow rate of the protective gas.

[0011] In an optional embodiment, the regulating valve opening control loop further includes a secondary controller connected to the main controller and connected to the first regulating valve. The secondary controller is configured to control the opening of the corresponding first regulating valve according to the output signal of the main controller.

[0012] Secondly, embodiments of this application provide a titanium tetrachloride production system, including a chlorination furnace and the aforementioned titanium tetrachloride cooling system; a quench tower in the titanium tetrachloride cooling system is disposed at the top of the chlorination furnace; the inlet of the quench tower is connected to the titanium tetrachloride outlet of the chlorination furnace.

[0013] The embodiments of this application have the following beneficial effects: By setting up a quench tower, a staged spray device, and a range control device, this application achieves efficient and stable cooling of high-temperature titanium tetrachloride gas. The system utilizes multiple spray gun assemblies arranged sequentially along the height of the quench tower to form a multi-stage cooling gradient, making the cooling process more uniform and reasonable, avoiding problems such as local overcooling or insufficient cooling. Combined with the range control device, each spray gun assembly can be activated as needed, dynamically adjusting the spray intensity according to changes in the cyclone collector outlet temperature, thereby improving the accuracy and response speed of temperature control. Furthermore, this application receives feedback signals from the temperature acquisition assembly through the main controller and generates corresponding control outputs. Each regulating valve opening control loop then independently drives the corresponding first regulating valve according to a preset signal range, thus achieving precise control of different spray gun assemblies. This phased, step-by-step activation of the spray gun assemblies can meet the energy-saving operation requirements under low load conditions while providing sufficient cooling capacity under high load conditions, effectively adapting to the complex operating conditions of large fluctuations in flue gas flow and temperature during chlorination furnace production. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and therefore should not be considered as a limitation on the scope of protection of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of a titanium tetrachloride cooling system according to an embodiment of this application is shown; Figure 2 A schematic diagram of the structure of the quench tower according to an embodiment of this application is shown.

[0016] Key component symbols: 1-Quick cooling tower; 2-Stage spray device; 3-Temperature acquisition component; 4-Main controller; 5-First regulating valve; 6-Second regulating valve; 7-Switching valve; 8-Cold titanium tetrachloride supply source; 9-Protective gas supply source; 10-First spray gun assembly; 11-Second spray gun assembly; 12-Third spray gun assembly; 13-Fourth spray gun assembly; 14-Secondary controller. Detailed Implementation

[0017] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0018] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0020] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0021] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] The titanium tetrachloride cooling system will be described below with reference to some specific embodiments.

[0023] Figure 1 A schematic diagram of a titanium tetrachloride cooling system according to an embodiment of this application is shown. Exemplarily, the titanium tetrachloride cooling system includes: a quench tower 1, a staged spray device 2 disposed within the quench tower 1, and a range control device connected to the staged spray device 2. This system is mainly used in the chlorination process for producing metallic titanium and its compounds, to rapidly cool the high-temperature titanium tetrachloride gas discharged from the chlorination furnace, preventing blockages in pipes and equipment due to sudden temperature drops, while ensuring the cyclone collector outlet temperature remains stable within a set range, thereby guaranteeing the continuity and stability of subsequent processes.

[0024] like Figure 2As shown, the quench tower 1 has a vertical structure and is installed on the outer surface of the top of the chlorination furnace, without occupying internal space and therefore not adversely affecting the normal production process. The bottom of the quench tower 1 has an inlet, which is connected to the titanium tetrachloride gas outlet of the chlorination furnace via a corrosion-resistant pipe, allowing high-temperature gas containing impurities to smoothly enter the quench tower 1. The upper part of the quench tower 1 has an outlet, which is connected to a gas-solid separation device via a pipe. This device can be a cyclone collector, used to effectively separate the cooled crude titanium tetrachloride liquid from other metal chloride particles. Because the quench tower 1 is a constricted-mouth device with a diameter much smaller than the chlorination furnace, the gas flow rate is high, resulting in high heat transfer efficiency. However, this also introduces the risk of localized overcooling, requiring precise control of the spray volume to balance the cooling effect and anti-clogging requirements.

[0025] The staged spray device 2 is installed inside the quench tower 1, with multiple spray gun assemblies arranged sequentially from bottom to top along the height of the tower. In this embodiment, the staged spray device 2 includes four spray gun assemblies, referred to as the first spray gun assembly 10, the second spray gun assembly 11, the third spray gun assembly 12, and the fourth spray gun assembly 13. These four spray gun assemblies are rationally distributed at different height regions of the quench tower 1 according to vertical spacing, forming a multi-level cooling gradient. Each spray gun assembly includes at least one nozzle, a connecting base, and a corresponding liquid / gas supply interface. The nozzle is the key component for realizing atomized spraying, directly affecting the gas-liquid contact area and heat transfer efficiency.

[0026] In this embodiment, all nozzles (the specific structural diagram of the nozzles is not shown) are atomizing nozzles, and the orientation of each nozzle is set at an angle of 30-60 degrees to the tower wall of the quench tower 1. In some embodiments, the nozzles can be 45° conical nozzles, which can ensure sufficient coverage area, avoid droplets directly impacting the tower wall and causing material accumulation or erosion damage, and form uniform and fine mist droplets under lower pressure conditions, thereby improving the mass transfer rate and heat exchange efficiency between the nozzles and the high-temperature flue gas.

[0027] Among them, the first spray gun assembly 10 located at the bottom is close to the air inlet of the quench tower 1. Its position is the area where high-temperature gas first enters, so it undertakes the main initial cooling task; the three spray gun assemblies above serve as supplementary cooling units, which are gradually put into operation when the load increases, and together maintain the stability of the outlet temperature.

[0028] In some embodiments, the nozzles of the first spray gun assembly 10 located at the bottom of the quench tower 1 are arranged upwards, meaning its spray direction is the same as the flow direction of the high-temperature titanium tetrachloride gas, forming a co-current spray (parallel flow) structure. This arrangement is beneficial for achieving a rapid quenching effect, allowing the high-temperature gas to be strongly cooled in the early stages of entering the quench tower 1, rapidly reducing the temperature and causing some metal chlorides to condense and precipitate prematurely, thus playing a role in pre-saturation and preliminary dust removal and cooling. Since this area has the highest temperature and the airflow velocity is relatively high, if counter-current spraying is used, droplets may be entrained and escape by the high-speed airflow, reducing cooling efficiency. Therefore, co-current spraying is more suitable. The nozzles of the other three spray gun assemblies (i.e., the second spray gun assembly 11, the third spray gun assembly 12, and the fourth spray gun assembly 13) are all arranged downwards, with the spray direction opposite to the gas flow direction, forming a counter-current spray structure. Counter-current operation can maintain a large temperature driving force and concentration gradient at all times, enabling efficient heat transfer and condensation recovery even when the temperature has dropped significantly near the outlet, thereby improving the overall system efficiency. In addition, the countercurrent arrangement helps to prolong the residence time of droplets, enhance the interaction between droplets and flue gas, and further optimize heat and mass transfer performance.

[0029] Each spray gun assembly is connected to two media supply sources via an independent piping system: one is a cold titanium tetrachloride supply source 8, and the other is a protective gas supply source 9.

[0030] Cold titanium tetrachloride refers to liquid titanium tetrachloride that has undergone cooling treatment. It typically originates from recycling processes. Although it still contains small amounts of impurities, it possesses good fluidity and is suitable for use as a spray cooling medium. Protective gas supply source 9 provides an inert gas, such as nitrogen, to purge and cool the nozzles when the spray gun is not in operation or running at low flow rates. This prevents residual crude titanium tetrachloride from undergoing hydrolysis to generate titanium dioxide and hydrochloric acid, which could then clog the nozzles or corrode the spray head.

[0031] To ensure safe switching between the two media, each spray gun assembly is equipped with a switching valve 7 on its corresponding pipeline to switch between the cold titanium tetrachloride path and the protective gas path. The switching valve 7 is automatically triggered by the control system based on the current operating conditions, ensuring that the two media do not flow simultaneously and preventing cross-contamination.

[0032] Specifically, the cold titanium tetrachloride supply source 8 is connected to each branch via a main pipeline, with a first regulating valve 5 and a switching valve 7 connected in series on each branch. The first regulating valve 5 can be a linear characteristic electric regulating valve, used to precisely control the flow rate of the cold titanium tetrachloride. When the main controller 4 issues an opening command, the first regulating valve 5 receives an opening signal from the corresponding secondary controller 14 and adjusts the valve opening accordingly, thereby changing the spray volume. After being regulated by the first regulating valve 5, the cold titanium tetrachloride enters the switching valve 7, and when the switching valve 7 is in the corresponding position, it is guided to the spray gun assembly to complete the spraying operation. On the other hand, the protective gas supply source 9 is also connected to the system via an independent pipeline, with a second regulating valve 6 and a flow meter installed in sequence on each branch, ultimately connecting to the pipeline between the switching valve 7 and the spray gun assembly. The second regulating valve 6 can also be an electric regulating valve, forming a protective gas control loop with the flow meter, which can monitor and adjust the nitrogen flow rate in real time to ensure a stable and controllable purging process. When the system determines that the protection mode needs to be activated, the switching valve 7 is activated to cut off the cold titanium tetrachloride passage and at the same time connect the nitrogen passage, so that the nitrogen flows into the spray gun assembly through the control loop composed of the second regulating valve 6 and the flow meter, continuously purging the inside of the nozzle, removing residual liquid and heat, and playing a dual role of preventing blockage and cooling.

[0033] The split-range control device is the core control unit of the entire cooling system, responsible for dynamically adjusting the working status of each spray gun component according to actual temperature changes. This split-range control device includes a temperature acquisition component 3, a main controller 4, and multiple regulating valve opening control loops corresponding to each spray gun component.

[0034] The temperature acquisition component 3 can be a temperature sensor, installed at the outlet of the cyclone collector, to collect the outlet temperature data. This temperature sensor converts the detected actual temperature value into a standard electrical signal and transmits it to the main controller 4. The main controller 4 can be a programmable logic controller (PLC) or a central control module in a distributed control system (DCS), with a preset target temperature range, such as 170℃ to 220℃. After receiving the feedback signal from the temperature acquisition component 3, the main controller 4 calculates the deviation based on the set target value and generates a control signal output between 0% and 100% using a built-in PID control algorithm. This control signal represents the current required overall cooling intensity and is the basis for determining which stage of the spray gun assembly to activate and how to adjust its spray volume.

[0035] Each regulating valve opening control loop corresponds to a spray gun assembly, receiving control signals from the main controller 4 and converting them into specific valve action commands. Each regulating valve opening control loop includes at least a first regulating valve 5 for regulating the supply of cold titanium tetrachloride. Additionally, each regulating valve opening control loop includes a secondary controller 14. This secondary controller 14 is typically a small PID controller or a remote I / O module, installed in a field control box and connected to the main controller 4 via a communication bus or analog signal line. The control signals output by the main controller 4 are distributed to different secondary controllers 14 according to a preset split-range logic. Each secondary controller 14 then independently drives its corresponding first regulating valve 5 to perform opening regulation based on the received sub-signals. This main-secondary collaborative control architecture not only reduces the computational burden on the main controller 4 but also improves the system's response speed and reliability, making it particularly suitable for complex operating conditions involving multi-branch parallel control.

[0036] Split-range control refers to dividing the 0% to 100% control signal output by the main controller 4 into several consecutive and partially overlapping preset signal intervals, with each interval corresponding to the operation of one spray gun assembly. Specifically, in this embodiment, when the output signal of the main controller 4 is in the 0% to 35% interval, the first regulating valve 5 corresponding to the first spray gun assembly 10 is opened, while the other spray gun assemblies remain closed. As the flue gas load increases, when the output signal of the main controller 4 rises to the 30% to 60% interval, the first regulating valve 5 corresponding to the second spray gun assembly 11 is opened, while the first spray gun assembly 10 remains open, achieving coordinated operation of dual-path spraying. When the signal continues to increase to the 50% to 80% interval, the third spray gun assembly 12 is opened, while the first two spray guns remain operational; finally, when the signal reaches the 80% to 100% interval, the fourth spray gun assembly 13 is activated, and the first three spray guns remain open. Therefore, the spray gun components do not operate in rotation, but rather in a step-by-step, cumulative manner. This allows the cooling capacity to gradually increase with the load, preventing excessive temperature fluctuations or localized overcooling. It is worth noting that there are certain overlap areas between adjacent preset signal intervals, such as 30% to 35% and 50% to 60%. These overlap areas are designed to achieve smooth transitions and disturbance-free switching between different spray gun components, suppressing control interference caused by a single valve being fully open or closed, and improving the dynamic stability of the entire system.

[0037] In the aforementioned control process, the activation of the spray gun assembly depends not only on the output signal of the main controller 4 but also on its own operating status. In particular, for the opening control of the first regulating valve 5, the system employs a crucial threshold judgment mechanism. When the secondary controller detects that the opening of the corresponding first regulating valve exceeds a set threshold (e.g., 10%), it issues a command to control the switching valve to cut off the protective gas passage and connect the cold titanium tetrachloride passage, allowing the spraying operation to proceed normally. Conversely, when the opening of the first regulating valve 5 is less than or equal to the set threshold, or is in a completely closed state, the system considers that the spray gun cannot generate an effective flushing flow, posing a risk of blockage. Therefore, it immediately triggers the protection logic, and the secondary controller 14 issues a command to control the switching valve 7 to cut off the cold titanium tetrachloride passage, simultaneously connecting the protective gas passage and activating the protective gas control loop composed of the second regulating valve 6 and the flow meter. This control loop automatically adjusts the opening of the second regulating valve 6 according to the preset purging flow value, maintaining a stable nitrogen flow and continuously purging the nozzle. This method in this embodiment can effectively solve the problem of nozzle clogging caused by crude titanium tetrachloride due to its high impurity content and easy crystallization. It plays an important role in ensuring safety, especially under non-steady-state conditions such as system start-up and shutdown, low-load operation, or sudden failure.

[0038] In addition, to further enhance the stability and adaptability of the spray system, this embodiment also includes a spray pump and a constant pressure regulating device. The spray pump is a multi-stage centrifugal pump installed at the front end of the cold titanium tetrachloride supply system to provide stable delivery power. The spray pump supplies the medium to the four spray nozzles via a main pipeline, designed in a ring or radial layout to minimize pressure differences between branches. The constant pressure regulating device is integrated into the pump control system and can adjust the motor speed via a frequency converter or the flow rate via a bypass return valve to maintain the main pipeline pressure within a set range (generally controlled at around 6 bar). In actual operation, the pressure at the regulating valve typically fluctuates between 3.5 and 5.5 bar, with the specific value influenced by pipeline resistance, nozzle type, and spray intensity. Furthermore, the constant pressure regulating device can also be linked with the furnace top temperature and cyclone collector outlet temperature signals to form a feedforward + feedback composite control system. For example, when the furnace top temperature suddenly rises, the system increases the pump pressure in advance to enhance the spraying capacity; when the outlet temperature deviates from the set value, the main controller 4 adjusts the split-range strategy, indirectly affecting the pump load. This multi-level pressure regulation mechanism ensures that the spraying system can provide sufficient and stable cooling medium under any operating condition, guaranteeing the consistency of atomization quality and cooling effect.

[0039] In non-operating mode, the protective gas control loop also possesses intelligent management capabilities. When a branch does not require nitrogen purging, the corresponding automatic protective gas control loop automatically switches to manual mode, the second regulating valve 6 is fully closed, and the flow meter reading returns to zero, avoiding unnecessary resource waste and system leakage risks. This switching action can be centrally scheduled by the main controller 4 or manually set by on-site operators as needed. All control logic is implemented through electrical interlocks, ensuring operational safety and reliability.

[0040] This embodiment achieves gradient-based precise cooling of high-temperature titanium tetrachloride gas by setting multiple spray gun assemblies sequentially distributed along the height direction within the quench tower and combining them with a split-range control device for graded activation and cumulative operation of each spray gun assembly. The bottom spray gun adopts a unidirectional spray structure, which can quickly reduce the flue gas temperature in the inlet area, achieving rapid quenching and pre-saturation. The upper spray gun adopts a counter-current spray structure, which effectively improves heat and mass transfer efficiency, ensuring that the cyclone collector outlet temperature remains stable within the target range of 170℃ to 220℃, meeting the requirements of subsequent processes. Each spray gun assembly in the system is equipped with an independent cold titanium tetrachloride passage and a protective gas passage, and the medium is automatically switched through a switching valve. When the opening of the corresponding first regulating valve is greater than the set threshold, the cold titanium tetrachloride is activated for spraying; when the opening is less than or equal to the threshold, the spraying medium is automatically cut off and nitrogen purging is initiated to prevent nozzle blockage caused by residual crystallization of crude titanium tetrachloride under low flow or shutdown conditions, thereby improving the equipment operating cycle and system reliability.

[0041] This application also provides a titanium tetrachloride production system, which includes a chlorination furnace and the aforementioned titanium tetrachloride cooling system; a quench tower 1 in the titanium tetrachloride cooling system is disposed at the top of the chlorination furnace; the inlet of the quench tower 1 is connected to the titanium tetrachloride outlet of the chlorination furnace.

[0042] It is understood that the options in the above embodiments also apply to this embodiment, so they will not be described again here.

[0043] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A titanium tetrachloride cooling system, characterized in that, include: A quench tower, a staged spray system installed inside the quench tower, and a range control device connected to the staged spray system; The graded spraying device includes at least two spray gun assemblies arranged sequentially along the height direction of the quench tower, and each spray gun assembly is connected to a cold titanium tetrachloride supply source via a pipeline. The split-range control device includes a temperature acquisition component, a main controller, and a regulating valve opening control loop corresponding to each of the spray gun components; each regulating valve opening control loop includes a first regulating valve for regulating the supply of cold titanium tetrachloride. The main controller is connected to the temperature acquisition component and is used to generate a control signal based on the collector outlet temperature acquired by the temperature acquisition component. Each of the regulating valve opening control loops is configured to open the first regulating valve on the corresponding regulating valve opening control loop according to the preset signal range in which the control signal is located, so as to adjust the spray volume of the corresponding spray gun assembly.

2. The titanium tetrachloride cooling system according to claim 1, characterized in that, Each of the spray gun assemblies is also connected to a protective gas supply source via a pipe; The regulating valve opening control loop also includes a second regulating valve for regulating the supply of protective gas and a switching valve for switching between the cold titanium tetrachloride passage and the protective gas passage. The cold titanium tetrachloride supply source is connected in sequence to the first regulating valve and the switching valve through pipelines, and is connected to the corresponding spray gun assembly; The protective gas supply source is connected in sequence to the pipeline between the second regulating valve, the switching valve and the quench tower via pipelines.

3. The titanium tetrachloride cooling system according to claim 1, characterized in that, The nozzles of the spray gun assembly located at the bottom of the quench tower are arranged facing upwards; the nozzles of the remaining spray gun assemblies are arranged facing downwards.

4. The titanium tetrachloride cooling system according to claim 3, characterized in that, The orientation of each nozzle is set at an angle of 30 to 60 degrees to the wall of the quench tower.

5. The titanium tetrachloride cooling system according to claim 3 or 4, characterized in that, The nozzle is an atomizing nozzle.

6. The titanium tetrachloride cooling system according to claim 1, characterized in that, The multiple preset signal intervals are distributed sequentially according to the output strength of the control signal of the main controller, and there are overlapping signal segments between adjacent preset signal intervals.

7. The titanium tetrachloride cooling system according to claim 6, characterized in that, The graded spraying device includes four spray gun assemblies arranged sequentially along the height direction of the quench tower. The lowest position of the spray gun assembly corresponds to the preset signal range with the lowest output intensity, and the highest position of the spray gun assembly corresponds to the preset signal range with the highest output intensity. The first regulating valve corresponding to each of the spray gun assemblies is configured to open step by step according to the increase of the signal output strength of the main controller, so as to adjust the spray volume of the corresponding spray gun assembly, and remain open after the signal output strength increases.

8. The titanium tetrachloride cooling system according to claim 2, characterized in that, The protective gas is an inert gas; the regulating valve opening control loop also includes a flow meter; the second regulating valve and the flow meter constitute a protective gas control loop, used to monitor and regulate the flow rate of the protective gas.

9. The titanium tetrachloride cooling system according to claim 2, characterized in that, The regulating valve opening control loop also includes a secondary controller, which is connected to the main controller and to the first regulating valve. The secondary controller is configured to control the opening of the corresponding first regulating valve according to the output signal of the main controller.

10. A titanium tetrachloride production system, characterized in that, The system includes a chlorination furnace and a titanium tetrachloride cooling system as described in any one of claims 1-9; a quench tower in the titanium tetrachloride cooling system is disposed at the top of the chlorination furnace; and the inlet of the quench tower is connected to the titanium tetrachloride outlet of the chlorination furnace.

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