Carbon black quenching boiler integrated equipment and carbon black quenching temperature control method

Abstract

The invention discloses carbon black quenching boiler integrated equipment which comprises a quenching pipeline and a quenching module, the quenching module comprises a variable-diameter adjusting unit, a driving and sealing unit and a control unit, the variable-diameter adjusting unit is composed of an open conical pipe and an adjusting sleeve arranged outside the open conical pipe in a sleeving mode, and the drift diameter of the conical pipe is changed through axial movement of the sleeve; the driving and sealing unit comprises four ball screws synchronously driven by a motor, screw nuts penetrate through long grooves in the side wall of the pipeline through connecting blocks to be connected with an inner sleeve, each connecting block is provided with an all-metal corrugated pipe dynamic sealing assembly, and the connecting blocks are completely isolated from the high-temperature pipeline through the assemblies. The control unit accurately controls the position of the sleeve according to outlet temperature feedback; rapid and accurate temperature adjustment is achieved through mechanical diameter changing, the dynamic sealing problem of moving parts in the high-temperature and dusty environment is thoroughly solved through all-metal sealing, and the high-temperature-resistant sealing device has the advantages of being high in adjusting precision, reliable in sealing, resistant to high temperature and easy and convenient to maintain.

Description

Technical Field

[0001] This invention relates to the field of carbon black production equipment technology, specifically to an integrated device for the rapid cooling process of high-temperature reaction gases in carbon black production, and more particularly to a rapid cooling boiler device and its adjustment method that can precisely adjust the inner diameter of the rapid cooling pipe online to achieve automatic temperature control. Background Technology

[0002] In the carbon black production process, the high-temperature carbon black flue gas generated from the reactor (temperatures typically reach 1400-1800℃) needs to be rapidly cooled to a specific temperature (usually below 800℃) to terminate the reaction, fix the product structure, and prevent excessive growth. The quench boiler (quench cooler) is the core equipment for performing this critical process, and its performance directly affects the quality, yield, and energy consumption of the carbon black product. Traditional quench boilers typically employ a fixed-structure water spray quenching method, controlling the final temperature by adjusting the amount of cooling water injected. However, this method has significant drawbacks: First, when fluctuations in raw materials or operating conditions cause changes in flue gas flow or initial temperature, adjusting only the water volume is inefficient and can easily lead to localized overcooling or insufficient cooling, affecting the stability of product quality. Second, the instantaneous vaporization of a large amount of cooling water, while quickly removing heat, places a significant pressure impact on the system, and the energy recovery efficiency needs improvement. Therefore, how to design a quench boiler device that can achieve precise, online, and stepless adjustment, ensure long-term reliable operation of the drive mechanism under extreme working conditions, and completely solve the dynamic sealing problem has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] The primary objective of this invention is to overcome the shortcomings of the prior art and provide an integrated carbon black quench boiler device. This device can completely solve the dynamic sealing problem at the penetration point of the high-temperature pipe wall while maintaining the high efficiency and precision of the core adjustment function, and achieve complete isolation between the drive mechanism and the high-temperature and dusty environment, thereby greatly improving the operational reliability, lifespan and maintenance-free cycle of the device.

[0004] To address the above problems, the present invention provides: 1. An integrated equipment for carbon black quench boiler The equipment includes a boiler piping section and a quench module integrated thereon. The core innovation of the quench module lies in the combination of its unique mechanical diameter-changing mechanism and a highly sealed, highly synchronized drive system.

[0005] (1) Variable diameter adjustment unit The variable diameter regulating unit is the core component of this invention for achieving flow and temperature control. It includes: Open conical tube: This component is fixedly installed inside the quench pipe. Its large-diameter end is reliably connected to the inner wall of the quench pipe by welding or other fixing methods, ensuring that it is coaxially arranged with the quench pipe. The conical tube has multiple evenly distributed "relaxation grooves" along its generatrix direction. These grooves give the conical tube a certain degree of elastic deformation capability in the radial direction.

[0006] Adjusting sleeve: This sleeve is fitted over the outside of the open conical tube. Its inner bore is designed as a conical surface that matches the outer surface of the open conical tube. When the adjusting sleeve moves along the pipe axis, its inner conical surface exerts a squeezing or releasing effect on the open conical tube. When the sleeve moves towards the smaller diameter end of the open conical tube (defined in this invention as the "closing direction"), it forces the open conical tube to contract, thereby reducing the diameter of its throat; conversely, when the sleeve moves in the opposite direction ("opening direction"), the open conical tube expands outward due to the elastic restoring force of its material, increasing the diameter.

[0007] Quenching nozzle: This nozzle is fixedly installed on the side wall of the quenching pipe downstream of the open conical pipe, and is used to spray atomized cooling medium (usually water) into the pipe. Its position and angle are optimized to ensure a uniform quenching effect even with varying flow rates.

[0008] (2) High-reliability drive and sealing unit This unit is one of the key innovations of this invention, designed to provide power for the precise movement of the regulating sleeve and to absolutely seal the internal environment of the high-temperature pipeline.

[0009] Drive actuator assembly: includes one drive motor, one or more bevel gear commutators, four ball screws, and corresponding screw nuts. The four ball screws are evenly arranged on the outer circumference of the quench pipe, centered on its axis. The drive motor, through a synchronous transmission system composed of bevel gear commutators, ensures that the four ball screws can achieve strictly synchronous rotation.

[0010] Motion conversion and connection components: A screw nut is fitted onto each ball screw. A parallel axial groove is formed on the quench pipe at the axial position corresponding to each screw nut. Each screw nut is fixedly connected to an adjusting sleeve located inside the pipe via a rigid high-temperature alloy connecting block passing through the corresponding axial groove. Thus, the rotational motion of the screw is converted into the linear motion of the screw nut, which in turn synchronously drags the adjusting sleeve axially via the four connecting blocks.

[0011] All-metal dynamic sealing assembly: This is the core of the invention for solving the high-temperature sealing problem. An independent high-temperature resistant metal bellows sealing assembly is installed for each connecting block and axial groove penetrating the pipe wall.

[0012] Metal bellows: A multi-layered nickel-based high-temperature alloy bellows (such as Inconel 625, Inconel 718, Hastelloy C-276, etc.) is used. One end (inner end) of the bellows is welded to the root of the connecting block in a full circumferential seal; the other end (outer end) is fastened to a pre-welded sealing mounting base on the outer wall of the quench pipe via a removable gland flange. A high-temperature metal spiral wound gasket is placed between the gland flange and the sealing mounting base to achieve a static seal.

[0013] Protection and Guidance: To protect the exposed bellows, a lightweight protective cover with ventilation holes can be installed. A small, uniform gap is maintained between the portion of the connecting block that passes through the long groove and the inner wall of the groove to prevent direct contact and friction.

[0014] Effect: This sealing assembly creates a flexible, axially expandable, all-metal sealed chamber between the connecting block and the high-temperature pipeline. Regardless of the movement of the connecting block, the bellows always completely isolates it from the high-temperature, dusty process gas, achieving a true "zero-leakage" dynamic seal. This allows the external precision drive system (motor, lead screw, bearing) to operate in a clean, low-temperature, and benign environment.

[0015] (3) Measurement and control unit Temperature measurement unit: includes at least one high-temperature thermocouple installed at the outlet of the quench pipe or downstream of the quench nozzle, for real-time monitoring of the temperature of the carbon black after quenching.

[0016] Control system: Receives signals from the temperature measuring unit, compares them with the preset target temperature value, calculates the target position required for adjusting the sleeve based on the deviation value using a predetermined control algorithm (such as PID algorithm), and then issues commands to control the direction and speed of the drive motor, forming a complete closed-loop control circuit.

[0017] 2. A method for controlling the rapid cooling temperature of carbon black based on the above-mentioned equipment. The method includes the following steps: Step S1: Initialization. When the system starts, the drive adjustment sleeve moves to a preset initial position (e.g., fully open position).

[0018] Step S2: Real-time monitoring. The real-time temperature value of the carbon black after rapid cooling is continuously collected by the temperature measurement unit.

[0019] Step S3: Comparison and Judgment. Compare the collected real-time temperature with the target temperature value set in the process.

[0020] Step S4: Closed-loop adjustment.

[0021] If the real-time temperature is lower than the target temperature, it indicates excessive cooling or too slow flow rate. The control system issues a command to drive the motor to rotate forward, which in turn drags the adjusting sleeve towards the "closed direction" via the four-screw synchronous system, compressing the open conical tube to reduce its diameter. The carbon black smoke flow rate inside the pipe increases, and the residence time at the quench nozzle is relatively shortened, resulting in less heat being carried away and thus raising the outlet temperature.

[0022] If the real-time temperature is higher than the target temperature, it indicates insufficient cooling or excessive flow rate. The control system issues a command to reverse the drive motor, dragging the regulating sleeve to move in the "opening direction." The open conical tube expands under elastic action, increasing its diameter. The carbon black flue gas flow rate slows down, and its residence time at the quench nozzle increases, resulting in more heat being carried away and thus lowering the outlet temperature.

[0023] Step S5: Dynamic Maintenance. Repeat steps S2 to S4 to form a dynamic and continuous closed-loop regulation process, ultimately stabilizing the quench outlet temperature within a very small range near the target value.

[0024] The integrated carbon black quench boiler equipment proposed in this application has the following advantages compared with the prior art: 1. Achieved absolutely reliable sealing under extreme operating conditions: The innovative all-metal bellows dynamic sealing assembly utilizes the excellent heat resistance and fatigue resistance of high-temperature alloy materials, combined with its axially expandable flexible structure, to perfectly solve the global challenge of sealing moving parts penetrating the pipe wall in high-temperature (>1000℃) and dusty environments. It achieves physical isolation between the drive mechanism and the process medium, eliminating leakage, contamination, and jamming, resulting in a revolutionary improvement in equipment reliability.

[0025] 2. Ensures high precision and synchronization in adjustment: A four-screw synchronous drive scheme is adopted, using a bevel gear commutator to ensure absolute synchronous movement of the four points, avoiding the risk of misalignment or jamming of the adjusting sleeve during movement. Combined with the precise control of the servo motor, it enables micron-level precise adjustment of the pipe diameter, thereby achieving refined management of temperature and flow rate.

[0026] 3. Rapid and stable temperature control response: By mechanically changing the pipe diameter to adjust the flow rate, thereby affecting the rapid cooling effect, this is a direct and rapid control method. Compared with adjusting only the spray water volume, this invention achieves coordinated adjustment of the "air side" and "water side," overcoming the lag of pure water volume adjustment. It can more quickly smooth out temperature disturbances caused by upstream operating condition fluctuations, thus significantly improving the final temperature stability.

[0027] 4. Robust structure and easy maintenance: The entire drive and sealing system is robust and durable. The sealing assembly adopts a modular design, with metal bellows and connecting blocks as pre-assembled units, fixed by flange connections. If a bellows needs to be replaced, the module can be disassembled and replaced individually under the condition of short-term equipment downtime, making maintenance very simple and greatly reducing maintenance costs and time.

[0028] 5. Extended equipment lifespan: Due to the perfect protection of the external drive system, its working environment is greatly improved, and the lifespan of precision components such as motors, lead screws, and bearings is extended by tens of times. At the same time, there are no complex mechanical moving parts inside the pipeline, and the main load-bearing components (open conical pipe, regulating sleeve) are all made of heat-resistant steel, significantly increasing the overall equipment lifespan.

[0029] 6. Enhanced energy utilization potential: More stable and faster temperature control provides a more stable heat source for subsequent waste heat recovery systems (such as waste heat boilers), which helps to improve the overall system's heat recovery efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of an integrated carbon black quench boiler according to the present invention; Figure 2 This is an exploded view of the structure of an integrated carbon black quench boiler device according to the present invention.

[0031] The components include: 1. quench pipe; 2. flange; 3. open conical pipe; 4. expansion groove; 5. adjusting sleeve; 6. lug; 7. ball screw; 8. drive motor; 9. screw nut; 10. long groove; 11. high temperature alloy connecting block; 12. bellows. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] See Figure 1 and Figure 2 This embodiment provides an integrated equipment for carbon black rapid cooling boiler.

[0036] The main body of the equipment is a quench pipe 1, with standard flanges 2 at both ends for connecting to the upstream carbon black reactor pipe and the downstream subsequent processing equipment (such as waste heat boiler) boiler pipe, thus connecting them in series in the process flow.

[0037] Inside the quench pipe 1, the core adjusting component of this invention—an open conical tube 3—is coaxially mounted. This conical tube is made of heat-resistant stainless steel (such as 310S) or high-temperature alloy steel plate, rolled, welded, and machined. Its large-diameter end is continuously welded to the inner wall of the quench pipe 1. A relaxation groove 4 is machined along the generatrix of the conical tube using electrical discharge machining or laser cutting. The groove is approximately 1-2 mm wide and about 2 / 3 the length of the conical tube, extending from the large-diameter end to the small-diameter end. The presence of the groove gives the originally rigid conical tube radial elasticity, allowing its diameter to vary within a certain range.

[0038] An adjusting sleeve 5 is fitted over the open conical tube 3. The adjusting sleeve 5 is also made of heat-resistant material, and its inner bore is machined into a smooth conical surface with the same taper as the outer surface of the open conical tube 3. A small assembly gap is maintained between the adjusting sleeve 5 and the open conical tube 3 to ensure that they can slide relative to each other without jamming. Four connecting lugs 6 are evenly distributed on the outer cylindrical surface of the adjusting sleeve 5.

[0039] The drive and sealing unit for driving and adjusting the movement of the sleeve 5 is arranged outside the quench pipe 1. Four ball screws 7 are evenly distributed around the circumference of the quench pipe 1 at 90-degree intervals and are fixed to a robust external bracket by bearing seats. A drive motor 8 (preferably a servo motor with a brake and encoder) drives a set of bevel gear commutators via a coupling, which are connected to one end of each of the four ball screws 7. This transmission method ensures that the rotation angles of the four screws are strictly synchronized.

[0040] Each ball screw 7 is fitted with a screw nut 9. On the wall of the quench pipe 1, corresponding to the axial movement trajectory of each screw nut 9, an axial groove 10 is formed. The width of this groove 10 is slightly larger than the width of the connecting block it will subsequently pass through, and its length is slightly larger than the full stroke required by the adjusting sleeve 5. Each screw nut 9 is connected to the internal adjusting sleeve 5 via a high-temperature alloy connecting block 11. Specifically, one end of the high-temperature alloy connecting block 11 is bolted to the screw nut 9, and the other end passes through the axial groove 10, extends into the pipe, and is bolted to the corresponding lug 6 on the adjusting sleeve 5. Thus, the rotational motion of the drive motor 8 is converted into synchronous, precise linear motion of the four screw nuts 9, ultimately driving the adjusting sleeve 5 to move axially.

[0041] The all-metal bellows 12 sealing assembly is installed at each axial long slot 10. The sealing mounting base is an annular seat, pre-welded to the outer wall of the quench pipe 1 and surrounding the axial long slot 10. The metal bellows 12 is a multi-layer (e.g., 3-5 layers) hydroformed alloy bellows 12, which has extremely high high temperature resistance and fatigue resistance (cycle life can reach more than one million cycles). The inner end of the bellows 12 is argon-arc welded to the root of the high-temperature alloy connecting block 11 in a full circumference. After welding, a penetration test is performed to ensure that there are no defects. The outer end of the bellows 12 has a flange. During installation, a high-temperature metal spiral wound gasket is first placed on the sealing surface of the sealing mounting base, then the outer flange of the bellows 12 is fitted on, and finally the gland flange is fastened to the sealing mounting base with bolts. The clamping force of the gland flange forms a reliable static seal between the bellows 12 flange, the gasket, and the sealing surface of the base. A perforated protective cover is bolted to the outside of the gland flange, protecting the bellows 12. This assembly forms a sealed telescopic chamber with the bellows 12 as the wall, completely enclosing the moving parts of the connecting block. No matter how it moves, high-temperature, high-pressure, and dusty process gases are completely isolated inside.

[0042] Downstream of the small-diameter end of the open conical pipe 3, multiple quench nozzles are installed on the side wall of the quench pipe 1. These nozzles are installed at a certain angle to ensure that the sprayed atomized water can cover the entire pipe cross-section. Not far downstream of the quench nozzles, a temperature measuring unit is installed. In this example, a type K armored thermocouple is used, with its probe extending into the central flow field region of the pipe.

[0043] The control system (which can be a PLC or DCS system) receives a 4-20mA temperature signal from the temperature measurement unit. The control system has a pre-set target temperature value T_set based on the process requirements. The control algorithm (e.g., a PID algorithm) calculates the required angle and direction of rotation for the drive motor 8 based on the deviation e between the real-time temperature T_real and T_set, and the rate of change of the deviation. The control system then sends pulse and direction commands to the servo driver, causing the drive motor 8 to move and precisely adjust the diameter of the open conical tube 3.

[0044] Working Process: In the initial state, the regulating sleeve 5 is at its rightmost end (opening direction limit), and the open conical tube 3 is in a free expansion state with its maximum diameter. High-temperature carbon black flue gas flows in from the left end, passing through the larger throat at this point, and enters the quenching zone at a relatively low flow rate. If the temperature detected by the temperature measuring unit is higher than the set value, the control system determines that enhanced cooling is needed. Therefore, the drive motor 8 starts to reverse, driving the four lead screws to rotate synchronously through the transmission system, causing the four lead screw nuts 9 to drive the connecting block and regulating sleeve 5 to slowly move to the left (closing direction). The inner conical surface of the regulating sleeve 5 begins to compress the open conical tube 3. Due to the presence of the expansion groove 4, the throat diameter of the open conical tube 3 begins to shrink uniformly and synchronously. This reduces the cross-sectional area of ​​the flue gas flowing through this area and increases the flow rate. The higher flow rate means that the residence time of carbon black particles is shortened when passing through the atomized water curtain area formed by the downstream quenching nozzle, reducing the heat carried away by a unit mass of carbon black, and the outlet temperature drops accordingly. This process continues until the temperature fed back by the temperature measuring unit reaches the set value, at which point the drive motor 8 stops. Conversely, if the temperature is lower than the set value, the drive motor 8 rotates forward, moving the adjusting sleeve 5 to the right. The open conical tube 3 regains its elasticity, its diameter increases, the flow rate slows down, the cooling effect is enhanced, and the outlet temperature rises. The entire adjustment process is smooth, continuous, and precise.

[0045] Throughout the adjustment process, although the connecting block reciprocates in the high-temperature axial groove 10, the high-temperature flue gas and carbon black dust above 1400℃ inside the pipe are 100% sealed due to the complete enclosure of the metal bellows 12. External components such as screws and bearings are always kept in a clean environment at room temperature, thus ensuring their service life.

[0046] Any aspects not detailed in this application are well-known to those skilled in the art.

[0047] The preferred embodiments of this application have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this application without inventive effort. Therefore, any technical solutions that can be obtained by those skilled in the art based on the concept of this application through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An integrated equipment for carbon black quench boilers, characterized in that, It includes a quench pipe and a quench module installed thereon, wherein the quench module includes a quench nozzle, a temperature measuring unit, a diameter adjustment unit and a drive and sealing unit; The variable diameter adjustment unit includes an open conical tube fixedly installed in the inner cavity of the quench pipe and having a relaxation groove along the generatrix, and an adjustment sleeve sleeved outside the open conical tube and having a matching conical surface on its inner wall. The quench nozzle is fixedly installed on the side wall of the quench pipe and located downstream of the open conical pipe; the temperature measuring unit is installed in the quench pipe downstream of the quench nozzle. The driving and sealing unit includes a driving assembly, a connecting assembly, a dynamic sealing assembly, and a control unit. The driving assembly includes at least one driving motor, multiple ball screws driven by the driving motor and achieving synchronous transmission, and screw nuts respectively fitted onto each ball screw. The multiple ball screws are evenly distributed around the outer periphery of the quenching pipe. The connecting assembly includes multiple high-temperature alloy connecting blocks respectively connected to each screw nut. The quenching pipe wall has axial grooves for each high-temperature alloy connecting block to pass through. The axial long groove is fixedly connected to the adjusting sleeve; the dynamic sealing assembly includes high-temperature resistant metal bellows in the same number as the axial long groove, one end of each metal bellows is sealed to the through section of the corresponding high-temperature alloy connecting block, and the other end is sealed to the sealing mounting base fixedly disposed on the outer wall of the quenching pipe around the corresponding axial long groove, thereby forming a sealed telescopic chamber that encloses the through section of the high-temperature alloy connecting block; the control unit includes a temperature measuring unit for detecting the temperature after quenching and a control system for receiving the signal from the temperature measuring unit and controlling the operation of the drive motor.

2. The integrated carbon black quench boiler equipment according to claim 1, characterized in that, The drive assembly also includes a mechanical synchronization mechanism for achieving synchronous rotation of multiple ball screws. The mechanical synchronization mechanism is a bevel gear commutator. The output shaft of the drive motor is connected to the input shaft of the bevel gear commutator. The multiple output shafts of the bevel gear commutator are respectively connected to each of the ball screws through couplings.

3. The integrated carbon black quench boiler equipment according to claim 1 or 2, characterized in that, The metal bellows is a multi-layered nickel-based high-temperature alloy bellows. One end of the bellows connected to the high-temperature alloy connecting block is the inner end of the bellows, which is sealed by welding. The other end of the bellows connected to the sealing mounting base is the outer end of the bellows, which is statically sealed by a detachable gland flange.

4. The integrated carbon black quench boiler equipment according to claim 3, characterized in that, A high-temperature metal spiral wound gasket is provided between the sealing surface of the gland flange and the sealing mounting base.

5. The integrated carbon black quench boiler equipment according to claim 1, characterized in that, The adjusting sleeve is fixedly connected to each of the high-temperature alloy connecting blocks through multiple connecting lugs evenly distributed on its outer periphery; the number of ball screws, the number of axial long grooves, the number of high-temperature alloy connecting blocks and the number of connecting lugs are all four, and they are evenly distributed in a 90-degree circumferential direction.

6. The integrated carbon black quench boiler equipment according to claim 1, characterized in that, The large-diameter end of the open conical tube is welded and fixed to the inner wall of the quench pipe, and the axis of the open conical tube coincides with the axis of the quench pipe.

7. The integrated carbon black quench boiler equipment according to claim 1, characterized in that, The drive motor is a servo motor with an encoder and a brake; the control system is a closed-loop controller based on a PID control algorithm, which is configured to: calculate the target position of the adjusting sleeve based on the deviation between the temperature detected by the temperature measuring unit and the preset target temperature, and drive the adjusting sleeve to move to the target position by controlling the servo motor.

8. A method for controlling the quenching temperature of carbon black based on the integrated carbon black quenching boiler equipment according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Real-time acquisition of carbon black temperature measurement value at the outlet of the quench pipe; S2. Compare the measured value with the preset target temperature value; S3. If the measured value is higher than the target value, the drive motor is controlled to move, and the adjusting sleeve is moved in the opening direction through the drive and sealing unit to increase the diameter of the open conical tube and reduce the carbon black flow rate to enhance cooling. S4. If the measured value is lower than the target value, the drive motor is controlled to move, and the adjusting sleeve is moved in the closing direction through the drive and sealing unit to reduce the diameter of the open conical tube and increase the carbon black flow rate to reduce cooling. S5. Repeat steps S1 to S4 to achieve closed-loop stable control of the outlet temperature.

9. The control method according to claim 8, characterized in that, In steps S3 and S4, the action quantity of the drive motor is calculated by the PID control algorithm based on the temperature deviation value and the rate of change of the deviation.

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