Rectifying tower system

Abstract

The embodiment of the invention provides a rectifying tower system. The system comprises a rectifying tower system, wherein the rectifying tower system comprises N first-stage separation towers and N second-stage separation towers, and N is a positive integer greater than or equal to 1; a first controller device is arranged in the first-stage separation tower, and the first controller device is used for adjusting an air cooler and all valves in the first-stage separation tower so as to adjust the pressure and temperature of a tower body of the first-stage separation tower; a second controller device is arranged in the separation secondary tower, and the second controller device is used for adjusting an air cooler and all valves in the separation secondary tower so as to adjust the pressure and temperature of the tower body of the separation secondary tower. The system is used for effectively improving the precision of side mining products.

Description

Technical Field

[0001] The present application relates to process control technology, and in particular to a distillation tower system. Background Art

[0002] In the existing process of separating high-purity trichlorosilane from recovered dry materials, the separation process is achieved based on a distillation tower system.

[0003] There is an urgent need for a solution that can improve the processing accuracy of a distillation tower during the separation process. Summary of the invention

[0004] The embodiment of the present application provides a distillation tower system for achieving the effect of improving the accuracy of side-drawn products.

[0005] In a first aspect, an embodiment of the present application provides a distillation tower system, wherein the distillation tower system comprises N primary separation towers and secondary separation towers, where N is a positive integer greater than or equal to 1;

[0006] The first separation tower is provided with a first controller device, and the first controller device is used to adjust the air cooler and valves in the first separation tower to adjust the pressure and temperature of the tower body of the first separation tower;

[0007] The secondary separation tower is provided with a second controller device, and the second controller device is used to adjust the air cooler and valves in the secondary separation tower to adjust the pressure and temperature of the tower body of the secondary separation tower.

[0008] In a possible embodiment, the first controller device is specifically used to adjust the air cooler and each valve in the first separation tower to increase the pressure of the tower body of the first separation tower if it is determined that the pressure of the tower body of the first separation tower is less than a first preset pressure threshold; if it is determined that the pressure of the tower body of the first separation tower is greater than the first preset pressure threshold, then adjust the air cooler and each valve in the first separation tower to reduce the pressure of the tower body of the first separation tower.

[0009] In one possible embodiment, the distillation tower system is provided with a bypass steam regulating valve; the first controller device is specifically used to increase the frequency of the air cooler of the first separation tower at a preset adjustment frequency if it is determined that the pressure of the tower body of the first separation tower is less than a first preset pressure threshold, and increase the opening of the top reflux regulating valve of the tower body of the first separation tower, and increase the opening of the lower liquid regulating valve of the first separation tower, and increase the opening of the bypass steam regulating valve.

[0010] In one possible embodiment, the distillation tower system is provided with a bypass steam regulating valve; the first controller device is specifically used to reduce the frequency of the air cooler of the first separation tower at a preset adjustment frequency, and reduce the opening of the top reflux regulating valve of the tower body of the first separation tower, and reduce the opening of the lower liquid regulating valve of the first separation tower, and reduce the opening of the bypass steam regulating valve if it is determined that the pressure of the tower body of the first separation tower is greater than a first preset pressure threshold.

[0011] In a possible embodiment, the first controller device is specifically used to adjust the air cooler and each valve in the first separation tower to reduce the temperature of the tower body of the first separation tower if it is determined that the temperature of the tower body of the first separation tower is greater than a first preset temperature threshold; if it is determined that the temperature of the tower body of the first separation tower is less than the first preset temperature threshold, then adjust the air cooler and each valve in the first separation tower to increase the temperature of the tower body of the first separation tower.

[0012] In one possible embodiment, the first controller device is specifically used to increase the opening of the top extraction regulating valve of the first separation tower and reduce the opening of the top reflux regulating valve of the first separation tower and the opening of the coil regulating valve of the first separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the first separation tower is greater than a first preset temperature threshold.

[0013] In a possible embodiment, the first controller device is specifically used to reduce the opening of the top extraction regulating valve of the first separation tower and increase the opening of the top reflux regulating valve of the first separation tower and the opening of the coil regulating valve of the first separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the first separation tower is lower than a first preset temperature threshold.

[0014] In a possible embodiment, the second controller device is specifically used to adjust the air cooler and each valve in the first separation tower to increase the pressure of the tower body of the second separation tower if it is determined that the pressure of the tower body of the second separation tower is less than the second preset pressure threshold; if it is determined that the pressure of the tower body of the second separation tower is greater than the second preset pressure threshold, then adjust the air cooler and each valve in the second separation tower to reduce the pressure of the tower body of the second separation tower.

[0015] In a possible embodiment, the distillation tower system is provided with a main line steam regulating valve and a by-line steam regulating valve; the second controller device is specifically used to increase the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency if it is determined that the pressure of the tower body of the separation secondary tower is less than a second preset pressure threshold, and increase the opening of the lower liquid regulating valve of the separation secondary tower, and increase the opening of the pressure relief regulating valve of the separation secondary tower, and increase the opening of the main line steam regulating valve of the separation secondary tower, and increase the opening of the by-line steam regulating valve of the separation secondary tower.

[0016] In a possible embodiment, the distillation tower system is provided with a main line steam regulating valve and a by-line steam regulating valve; the second controller device is specifically used to reduce the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency, and reduce the opening of the lower liquid regulating valve of the separation secondary tower, and reduce the opening of the pressure relief regulating valve of the separation secondary tower, and reduce the opening of the main line steam regulating valve of the separation secondary tower, and reduce the opening of the by-line steam regulating valve of the separation secondary tower, if it is determined that the pressure of the tower body of the separation secondary tower is greater than a second preset pressure threshold.

[0017] In one possible embodiment, the second controller device is used to adjust the air cooler and each valve in the separation secondary tower to reduce the temperature of the tower body of the separation secondary tower if it is determined that the temperature of the tower body of the separation secondary tower is greater than the second preset temperature threshold; if it is determined that the temperature of the tower body of the separation secondary tower is less than the second preset temperature threshold, then adjust the air cooler and each valve in the separation secondary tower to increase the temperature of the tower body of the separation secondary tower.

[0018] In one possible embodiment, the second controller device is specifically used to increase the frequency of the air cooler of the secondary separation tower at a preset adjustment frequency, increase the opening of the top extraction regulating valve of the secondary separation tower, and reduce the opening of the top reflux regulating valve of the secondary separation tower, and reduce the opening of the coil regulating valve of the secondary separation tower, and reduce the opening of the lower liquid regulating valve of the secondary separation tower if it is determined that the temperature of the tower body of the secondary separation tower is greater than the second preset temperature threshold.

[0019] In one possible embodiment, the second controller device is specifically used to reduce the frequency of the air cooler of the secondary separation tower and reduce the opening of the top extraction regulating valve of the secondary separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the secondary separation tower is lower than a second preset temperature threshold, and increase the opening of the top reflux regulating valve of the secondary separation tower and increase the opening of the coil regulating valve of the secondary separation tower and increase the opening of the lower liquid regulating valve of the secondary separation tower.

[0020] In a possible embodiment, the first separation tower is provided with a first reboiler, and the second separation tower is provided with a second reboiler;

[0021] The first-stage separation towers in the N first-stage separation towers are connected in sequence; the tower body of the first-stage separation tower in the adjacent first-stage separation towers is connected to the first reboiler in the next first-stage separation tower, and the first reboiler in the next first-stage separation tower is connected to the tower body in the next first-stage separation tower;

[0022] The tower body of the Nth primary separation tower among the N primary separation towers is connected to the second reboiler, and the second reboiler is connected to the tower body of the secondary separation tower;

[0023] The energy in the tower body of the previous first-stage separation tower in adjacent first-stage separation towers flows into the tower body of the next first-stage separation tower through the connected first reboiler; the energy in the tower body of the Nth first-stage separation tower flows into the tower body of the second-stage separation tower through the connected second reboiler.

[0024] In a possible implementation manner, an air cooler is provided in the primary separation tower;

[0025] Wherein, the air cooler of the first separation tower in the adjacent first separation towers is connected to the first reboiler in the second separation tower;

[0026] The air cooler of the Nth separation primary tower is connected to the second reboiler.

[0027] The embodiment of the present application introduces a distillation tower system, which is equipped with a first controller device and a second controller device in the first separation tower and the second separation tower, respectively. These two sets of controller devices can receive real-time monitoring data from sensors in the corresponding towers, including pressure and temperature information. Once the pressure or temperature in the tower is monitored to exceed the respective preset safety ranges, the first controller device and the second controller device will immediately start the precise control mechanism to adjust the operating frequency of the air cooler in the first separation tower and the second separation tower and the degree of opening of each valve. Through this series of fine operations, the system can ensure that the pressure and temperature of the tower body are maintained within the preset range, thereby effectively improving the accuracy of the side-collected products. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 Schematic diagram of the control process of the distillation tower system provided in the embodiment of the present application Figure 1 ;

[0030] Figure 2Schematic diagram of the control process of the distillation tower system provided in the embodiment of the present application Figure 2 ;

[0031] Figure 3 Schematic diagram of the structure of the distillation tower system provided in the embodiment of the present application Figure 1 ;

[0032] Figure 4 Schematic diagram of the structure of the distillation tower system provided in the embodiment of the present application Figure 2 .

[0033] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0035] A distillation tower is a tower-type gas-liquid contact device for distillation. By utilizing the different volatilities of the components in the mixture, that is, the different vapor pressures of the components at the same temperature, the light components (low-boiling substances) in the liquid phase are transferred to the gas phase, and the heavy components (high-boiling substances) in the gas phase are transferred to the liquid phase, thereby achieving the purpose of separation. Trichlorosilane distillation is one of the core technologies of the polysilicon production process. The degree of trichlorosilane purification directly affects the purity of the final product polysilicon, which is the basic material for manufacturing semiconductor devices, integrated circuits, and solar cells. The distillation tower is mainly used to process the coarse fraction produced in the cold hydrogenation workshop. Dichlorodihydrogen silicon is removed through the top sampling of the separation tower, and silicon tetrachloride is removed through the kettle sampling of the separation tower. The final side sampling product is high-precision trichlorosilane.

[0036] In existing systems, the gas-liquid phase equilibrium in the tower may become unstable due to changes in operating conditions. In particular, when pressure or temperature fluctuates, it may cause an imbalance in the material distribution ratio between the gas and liquid phases, affecting the separation efficiency.

[0037] Therefore, the present application proposes a distillation tower system that can solve the above problems.

[0038] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0039] Figure 1 Schematic diagram of the control process of the distillation tower system provided in the embodiment of the present application Figure 1 ,like Figure 1 As shown, the distillation tower system includes N primary separation towers and secondary separation towers, where N is a positive integer greater than or equal to 1;

[0040] S101. A first controller device is provided in the first separation tower, and the first controller device is used to adjust the air cooler and valves in the first separation tower to adjust the pressure and temperature of the tower body of the first separation tower.

[0041] Exemplarily, the first controller device provided in the first separation tower is used to adjust key operating parameters such as pressure and temperature in the first separation tower, which is essential to ensure an efficient separation process. Specifically, the first controller device achieves precise control of the internal environment of the tower body by adjusting the opening of the air cooler and each valve. The main function of the air cooler is to reduce the temperature of the steam at the top of the tower, so that the heavier components therein are condensed and refluxed into the tower.

[0042] Exemplarily, the first controller device is configured, and the first preset pressure threshold and the first preset temperature threshold are input as control targets; at the same time, the allowable deviation range is set to ensure that the system does not require frequent adjustments within the normal fluctuation range. High-precision pressure sensors and temperature sensors are installed at key positions of the first-stage separation tower to monitor the pressure and temperature changes in the tower in real time. These sensors send the real-time collected data to the first controller device via wired or wireless means, so that the first controller device can facilitate subsequent operations. After receiving the data from the sensor, the first controller device automatically compares the current actual pressure and temperature values ​​with the preset target values. If it is detected that the actual value deviates from the preset value and its allowable deviation range, the controller will trigger the corresponding adjustment mechanism; otherwise, the current state remains unchanged.

[0043] S102, a second controller device is provided in the secondary separation tower, and the second controller device is used to adjust the air cooler and valves in the secondary separation tower to adjust the pressure and temperature of the tower body of the secondary separation tower.

[0044] Exemplarily, the second controller device provided in the separation secondary tower is used to adjust key operating parameters such as pressure and temperature in the separation secondary tower, which is essential to ensure an efficient separation process. Specifically, the second controller device achieves precise control of the internal environment of the tower body of the separation secondary tower by adjusting the opening of the air cooler and each valve. The main function of the air cooler is to reduce the temperature of the steam at the top of the tower, so that the heavier components therein are condensed and refluxed into the tower.

[0045] Exemplarily, the second controller device is configured, and the second preset pressure threshold and the second preset temperature threshold are input as control targets; at the same time, the allowable deviation range is set to ensure that the system does not require frequent adjustments within the normal fluctuation range. High-precision pressure sensors and temperature sensors are installed at key positions of the separation secondary tower to monitor the pressure and temperature changes in the tower in real time. These sensors send the real-time collected data to the second controller device via wired or wireless means, so that the second controller device can facilitate subsequent operations. After receiving the data from the sensor, the second controller device automatically compares the current actual pressure and temperature values ​​with the preset target values. If it is detected that the actual value deviates from the preset value and its allowable deviation range, the controller will trigger the corresponding adjustment mechanism; otherwise, the current state remains unchanged.

[0046] The embodiment of the present application introduces a distillation tower system, which is equipped with a first controller device and a second controller device in the first separation tower and the second separation tower, respectively. These two sets of controller devices can receive real-time monitoring data from sensors in the corresponding towers, including pressure and temperature information. Once the pressure or temperature in the tower is monitored to exceed the respective preset safety ranges, the first controller device and the second controller device will immediately start the precise control mechanism to adjust the operating frequency of the air cooler in the first separation tower and the second separation tower and the degree of opening of each valve. Through this series of fine operations, the system can ensure that the pressure and temperature of the tower body are maintained within the preset range, thereby effectively improving the accuracy of the side-collected products.

[0047] Figure 2 Schematic diagram of the control process of the distillation tower system provided in the embodiment of the present application Figure 2 ,like Figure 2 As shown, in this embodiment Figure 1 Based on the embodiment, a distillation tower system is described in detail, and the method includes:

[0048] S201, a first controller device, specifically used to adjust the air cooler and each valve in the first separation tower to increase the pressure of the tower body of the first separation tower if it is determined that the pressure of the tower body of the first separation tower is less than a first preset pressure threshold; if it is determined that the pressure of the tower body of the first separation tower is greater than the first preset pressure threshold, then adjust the air cooler and each valve in the first separation tower to reduce the pressure of the tower body of the first separation tower.

[0049] In one example, a distillation tower system is provided with a by-line steam regulating valve; a first controller device is specifically used to increase the frequency of the air cooler of the first separation tower at a preset adjustment frequency if it is determined that the pressure of the tower body of the first separation tower is less than a first preset pressure threshold, and to increase the opening of the top reflux regulating valve of the tower body of the first separation tower, and to increase the opening of the lower liquid regulating valve of the first separation tower, and to increase the opening of the by-line steam regulating valve.

[0050] In one example, a distillation tower system is provided with a by-line steam regulating valve; a first controller device is specifically used to reduce the frequency of the air cooler of the first separation tower at a preset adjustment frequency, and reduce the opening of the top reflux regulating valve of the tower body of the first separation tower, and reduce the opening of the lower liquid regulating valve of the first separation tower, and reduce the opening of the by-line steam regulating valve if it is determined that the pressure of the tower body of the first separation tower is greater than a first preset pressure threshold.

[0051] Exemplarily, the first controller device monitors the tower top pressure in real time through a high-precision pressure sensor installed on a tower plate of the first separation tower. Once it is found that the actual tower top pressure is lower than the set first preset pressure threshold, the air cooler and each valve in the first separation tower are adjusted to increase the pressure of the tower body of the first separation tower; wherein the first preset pressure threshold is (0.545±0.005) MPa. Once it is found that the actual tower top pressure is higher than the set first preset pressure threshold, the air cooler and each valve in the first separation tower are adjusted to reduce the pressure of the tower body of the first separation tower.

[0052] Exemplarily, when the actual tower top pressure is less than (0.545±0.005) MPa, it is necessary to slowly increase the air cooler frequency of the first-stage separation tower multiple times; and increase the opening of the tower top reflux regulating valve of the tower body of the first-stage separation tower, with each adjustment range being 1.25%; and increase the opening of the lower liquid regulating valve of the first-stage separation tower, with each adjustment range being 1%-2%; and increase the opening of the secondary line steam regulating valve, with each adjustment range being 0.1%.

[0053] Exemplarily, when the actual tower top pressure is greater than (0.545±0.005) MPa, it is necessary to slowly reduce the air cooler frequency of the first-stage separation tower for multiple times; and reduce the opening of the tower top reflux regulating valve of the tower body of the first-stage separation tower, with each adjustment range being 1.25%; and reduce the opening of the lower liquid regulating valve of the first-stage separation tower, with each adjustment range being 1%-2%; and reduce the opening of the secondary line steam regulating valve, with each adjustment range being 0.1%.

[0054] This application introduces a first controller device and its precise control strategy to monitor and adjust the pressure of the first separation tower in real time, ensuring that the top pressure is maintained within a reasonable range of (0.545±0.005) MPa. By precisely controlling the top pressure, it is possible to ensure that parameters such as temperature and flow rate during the distillation process remain stable, thereby providing more consistent product quality. A stable tower environment helps to more effectively separate target compounds and reduce the content of impurities in the product, which is particularly important for the polysilicon industry that requires high-purity products.

[0055] S202, a first controller device, specifically used to adjust the air cooler and each valve in the first separation tower to reduce the temperature of the tower body of the first separation tower if it is determined that the temperature of the tower body of the first separation tower is greater than a first preset temperature threshold; if it is determined that the temperature of the tower body of the first separation tower is less than the first preset temperature threshold, then adjust the air cooler and each valve in the first separation tower to increase the temperature of the tower body of the first separation tower.

[0056] In one example, the first controller device is specifically used to increase the opening of the top extraction regulating valve of the first separation tower and reduce the opening of the top reflux regulating valve of the first separation tower and the opening of the coil regulating valve of the first separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the first separation tower is greater than a first preset temperature threshold.

[0057] In one example, the first controller device is specifically used to reduce the opening of the top extraction regulating valve of the first separation tower and increase the opening of the top reflux regulating valve of the first separation tower and the opening of the coil regulating valve of the first separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the first separation tower is less than a first preset temperature threshold.

[0058] Exemplarily, high-precision temperature sensors are installed at the top, middle, bottom and side outlet of the first-stage separation tower respectively, for real-time monitoring of the temperature of each part (including the top temperature, the middle temperature, the bottom temperature and the side outlet temperature). The first controller device obtains data through these sensors to realize comprehensive monitoring of the temperature in the tower. Once it is found that the temperature in the tower is lower than the corresponding first preset temperature threshold, the air cooler and each valve in the first-stage separation tower are adjusted to increase the temperature of the tower body of the first-stage separation tower. Once it is found that the temperature in the tower is higher than the corresponding first preset temperature threshold, the air cooler and each valve in the first-stage separation tower are adjusted to reduce the temperature of the tower body of the first-stage separation tower. The first preset temperature threshold corresponding to the top temperature is (94.5±1)℃; the first preset temperature threshold corresponding to the middle temperature is (100±1)℃; the first preset temperature threshold corresponding to the bottom temperature is (94.5±1)℃; the first preset temperature threshold corresponding to the side outlet temperature is (129±1)℃.

[0059] For example, when the temperature inside the first separation tower is lower than the corresponding first preset temperature threshold, it is necessary to slowly increase the opening of the top extraction regulating valve of the first separation tower for multiple times, with each adjustment range of 1%-2%; and reduce the opening of the top reflux regulating valve of the first separation tower, with each adjustment range of 1%-2%; and reduce the opening of the coil regulating valve of the first separation tower, with each adjustment range of 0.5%-1%, until the temperature inside the tower returns to the range of the corresponding first preset temperature threshold.

[0060] For example, when the temperature inside the first separation tower is higher than the corresponding first preset temperature threshold, it is necessary to slowly reduce the opening of the top extraction regulating valve of the first separation tower for multiple times, with each adjustment range of 1%-2%; and increase the opening of the top reflux regulating valve of the first separation tower, with each adjustment range of 1%-2%; and increase the opening of the coil regulating valve of the first separation tower, with each adjustment range of 0.5%-1%, until the temperature inside the tower returns to the range of the corresponding first preset temperature threshold.

[0061] This application monitors the different preset temperature thresholds of the top, middle, bottom and side outlet of the first-stage separation tower separately, so that each area can work within its most suitable operating temperature range, ensuring that the temperature distribution in the entire tower is uniform and meets the process requirements. When the temperature deviates from the set threshold, the opening of the relevant valves (such as the top extraction regulating valve, the top reflux regulating valve, and the coil regulating valve) is slowly adjusted multiple times, and the adjustment range is strictly controlled within 1%-2% or 0.5%-1% each time. This refined adjustment method can prevent over-adjustment and ensure that the temperature recovery process is smooth and stable.

[0062] S203, a second controller device, is specifically used to adjust the air cooler and each valve in the first separation tower to increase the pressure of the tower body of the second separation tower if it is determined that the pressure of the tower body of the second separation tower is less than the second preset pressure threshold; if it is determined that the pressure of the tower body of the second separation tower is greater than the second preset pressure threshold, then adjust the air cooler and each valve in the second separation tower to reduce the pressure of the tower body of the second separation tower.

[0063] In one example, a distillation tower system is provided with a main line steam regulating valve and a by-line steam regulating valve; a second controller device is specifically used to increase the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency if it is determined that the pressure of the tower body of the separation secondary tower is less than a second preset pressure threshold, and increase the opening of the lower liquid regulating valve of the separation secondary tower, and increase the opening of the pressure relief regulating valve of the separation secondary tower, and increase the opening of the main line steam regulating valve of the separation secondary tower, and increase the opening of the by-line steam regulating valve of the separation secondary tower.

[0064] In one example, a distillation tower system is provided with a main line steam regulating valve and a by-line steam regulating valve; a second controller device is specifically used to reduce the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency, and reduce the opening of the lower liquid regulating valve of the separation secondary tower, and reduce the opening of the pressure relief regulating valve of the separation secondary tower, and reduce the opening of the main line steam regulating valve of the separation secondary tower, and reduce the opening of the by-line steam regulating valve of the separation secondary tower, if it is determined that the pressure of the tower body of the separation secondary tower is greater than a second preset pressure threshold.

[0065] Exemplarily, the second controller device monitors the tower top pressure in real time through a high-precision pressure sensor installed on a tower plate of the separation secondary tower. Once it is found that the actual tower top pressure is lower than the set second preset pressure threshold, the air cooler and each valve in the separation secondary tower are adjusted to increase the pressure of the tower body of the separation secondary tower; wherein the second preset pressure threshold is (0.325±0.01) MPa. Once it is found that the actual tower top pressure is higher than the set second preset pressure threshold, the air cooler and each valve in the separation secondary tower are adjusted to reduce the pressure of the tower body of the separation secondary tower.

[0066] For example, when the actual tower top pressure is lower than (0.325±0.01)Mpa, the second controller device will take the following measures: slowly and repeatedly increase the frequency of separating the secondary tower air cooler; at the same time, gradually increase the opening of the lower liquid regulating valve, and each adjustment range is controlled between 0.1%-0.2%; in addition, the opening of the tower body's pressure relief regulating valve, the main line steam regulating valve, and the secondary line steam regulating valve will be increased, and each adjustment range is 1%-2% and 0.1%-0.5% respectively. These adjustment operations will continue until the tower top pressure returns to a reasonable range.

[0067] For example, when the actual tower top pressure is higher than (0.325±0.01)Mpa, the second controller device will take the opposite adjustment measures: slowly and repeatedly reduce the frequency of separating the secondary tower air cooler; at the same time, gradually reduce the opening of the lower liquid regulating valve, and each adjustment range is also controlled between 0.1%-0.2%; in addition, the tower body's pressure relief regulating valve, main line steam regulating valve and secondary line steam regulating valve openings will also be reduced, and each adjustment range is 1%-2% and 0.1%-0.5% respectively. These adjustment operations will also continue to ensure that the tower top pressure can be steadily reduced to a reasonable range.

[0068] This application avoids the adverse effects of rapid pressure changes on production equipment, product quality, and production safety by slowly and repeatedly adjusting the air cooler frequency and the opening of each valve. Fine-tuning allows the pressure to rise or fall smoothly and remain within a set reasonable range, thereby ensuring the continuity and stability of the production process. Accurately controlling the pressure of the separation secondary tower helps optimize production conditions, improve the conversion rate and selectivity of chemical reactions, and thus improve product quality and output. A stable pressure environment reduces fluctuations and uncertainties in the production process, making production more efficient and reliable.

[0069] S204, a second controller device, for adjusting the air cooler and each valve in the separation secondary tower to reduce the temperature of the tower body of the separation secondary tower if it is determined that the temperature of the tower body of the separation secondary tower is greater than the second preset temperature threshold; if it is determined that the temperature of the tower body of the separation secondary tower is less than the second preset temperature threshold, adjusting the air cooler and each valve in the separation secondary tower to increase the temperature of the tower body of the separation secondary tower.

[0070] In one example, the second controller device is specifically used to increase the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency, increase the opening of the top extraction regulating valve of the separation secondary tower, and reduce the opening of the top reflux regulating valve of the separation secondary tower, and reduce the opening of the coil regulating valve of the separation secondary tower, and reduce the opening of the lower liquid regulating valve of the separation secondary tower if it is determined that the temperature of the tower body of the separation secondary tower is greater than the second preset temperature threshold.

[0071] In one example, the second controller device is specifically used to reduce the frequency of the air cooler of the separation secondary tower and reduce the opening of the top extraction regulating valve of the separation secondary tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the separation secondary tower is less than the second preset temperature threshold, and increase the opening of the top reflux regulating valve of the separation secondary tower, and increase the opening of the coil regulating valve of the separation secondary tower, and increase the opening of the lower liquid regulating valve of the separation secondary tower.

[0072] Exemplarily, high-precision temperature sensors are installed at the top, middle, bottom and side outlet of the secondary separation tower respectively, for real-time monitoring of the temperature of each part (including the top temperature, the middle temperature, the bottom temperature and the side outlet temperature). The first controller device obtains data through these sensors to realize comprehensive monitoring of the temperature in the tower. Once it is found that the temperature in the tower is lower than the corresponding second preset temperature threshold, the air cooler and each valve in the secondary separation tower are adjusted to increase the temperature of the tower body of the secondary separation tower. Once it is found that the temperature in the tower is higher than the corresponding second preset temperature threshold, the air cooler and each valve in the secondary separation tower are adjusted to reduce the temperature of the tower body of the secondary separation tower. The second preset temperature threshold corresponding to the top temperature is (51±1)℃; the first preset temperature threshold corresponding to the middle temperature is (70±1)℃; the first preset temperature threshold corresponding to the bottom temperature is (81±2)℃; the first preset temperature threshold corresponding to the side outlet temperature is (131±1)℃.

[0073] For example, when the temperature inside the secondary separation tower is lower than the corresponding second preset temperature threshold, it is necessary to slowly increase the frequency of the air cooler of the secondary separation tower for multiple times; and increase the opening of the top extraction regulating valve of the secondary separation tower, with each adjustment range of 1%-2%; and reduce the opening of the top reflux regulating valve of the secondary separation tower, with each adjustment range of 1%-2%; and reduce the opening of the coil regulating valve of the secondary separation tower, with each adjustment range of 0.5%-1%; and reduce the opening of the lower liquid regulating valve of the secondary separation tower, with each adjustment range of 0.1%-0.2%. These adjustment operations will continue until the temperature inside the tower returns to the corresponding second preset temperature threshold range.

[0074] For example, when the temperature inside the secondary separation tower is lower than the corresponding second preset temperature threshold, it is necessary to slowly reduce the frequency of the air cooler of the secondary separation tower for multiple times; and reduce the opening of the top extraction regulating valve of the secondary separation tower, with each adjustment range of 1%-2%; and increase the opening of the top reflux regulating valve of the secondary separation tower, with each adjustment range of 1%-2%; and increase the opening of the coil regulating valve of the secondary separation tower, with each adjustment range of 0.5%-1%; and increase the opening of the lower liquid regulating valve of the secondary separation tower, with each adjustment range of 0.1%-0.2%. These adjustment operations will continue until the temperature inside the tower returns to the corresponding second preset temperature threshold range.

[0075] This application ensures that the temperature of each section in the distillation process is maintained within the optimal range by real-time monitoring and regulation of the temperature of the tower top, tower middle, tower bottom and side outlet, thereby improving the purity of the target product. The gradual fine-tuning of the valve opening can not only respond quickly to temperature changes, but also avoid energy waste caused by excessive adjustment. High-precision sensors and fast feedback control systems can effectively respond to temperature fluctuations in a short period of time, shorten adjustment time, and improve production efficiency.

[0076] A distillation tower system provided in the present embodiment includes: a first separation tower is provided with a first reboiler, and a second separation tower is provided with a second reboiler; the first separation towers in N first separation towers are connected in sequence; the tower body of the previous first separation tower in adjacent first separation towers is connected to the first reboiler in the next first separation tower, and the first reboiler in the next first separation tower is connected to the tower body in the next first separation tower; the tower body of the Nth first separation tower in the N first separation towers is connected to the second reboiler, and the second reboiler is connected to the tower body of the second separation tower.

[0077] The energy in the tower body of the previous first-stage separation tower in adjacent first-stage separation towers flows into the tower body of the next first-stage separation tower through the first reboiler connected thereto; the energy in the tower body of the Nth first-stage separation tower flows into the tower body of the second-stage separation tower through the second reboiler connected thereto.

[0078] Exemplarily, the distillation tower system includes N separation first-stage towers, each of which is equipped with a first reboiler; and a separation second-stage tower, which is equipped with a second reboiler. N is an integer greater than or equal to one. The energy transfer between adjacent separation first-stage towers and between the last separation first-stage tower and the separation second-stage tower is achieved through their respective first reboilers and second reboilers. The N separation first-stage towers are connected in sequence to form a continuous energy transfer chain. In two adjacent separation first-stage towers, the heat in the previous tower body is transferred to the first reboiler of the next tower through the first reboiler connected thereto, and then flows into the tower body of the next tower. This method ensures that heat is transferred from the upstream tower to the downstream tower step by step, thereby achieving efficient energy recovery and utilization.

[0079] Exemplarily, the tower body of each separation primary tower is connected to its corresponding first reboiler to provide the necessary heating or reboiling function. In two adjacent separation primary towers, the tower body of the previous one is connected to the first reboiler of the next tower through a pipeline from the top of the tower to ensure the effective transfer of heat. The first reboiler of the next tower is then connected to the tower body of the next tower to complete the heat exchange cycle. The tower body of the Nth separation primary tower is connected to the second reboiler from the top of the tower through a pipeline to transfer the remaining energy to the second reboiler. The second reboiler is then connected to the tower body of the separation secondary tower to provide the required heat for the separation secondary tower to continue the distillation process.

[0080] For example, in the first separation primary tower, the heat in the tower body is used to evaporate the material, and the generated steam is transferred to the second separation primary tower through the first reboiler as a heat carrier. The first reboiler of the second separation primary tower receives the heat from the previous tower to heat its own material, and the above process is repeated. And so on, until the Nth separation primary tower, it transfers the unused heat to the second reboiler. Finally, the second reboiler transfers this heat to the separation secondary tower to support its distillation operation.

[0081] An air cooler is provided in the first separation tower; wherein, the air cooler of the first separation tower in the adjacent first separation towers is connected to the first reboiler in the next first separation tower; and the air cooler of the Nth first separation tower is connected to the second reboiler.

[0082] Exemplarily, the tower body of each first-stage separation tower is connected to its corresponding first reboiler to provide necessary heating or reboiler functions; an air cooler is installed at the top of each first-stage separation tower to cool the top steam and recover the condensation heat; each first-stage separation tower is also provided with a reflux tank to collect the condensed liquid and reintroduce it into the tower body.

[0083] The specific connection method is: the pipe at the top of the previous separation tower is directly connected to the first reboiler of the next separation tower. In this way, the steam generated at the top of the previous tower can directly provide heat for the first reboiler of the next tower; the first reboiler of the next tower is connected to the air cooler of the previous tower through another pipe. This part of the pipe is used to transfer excess heat to the air cooler of the previous tower for condensation; the condensate recovered by the air cooler flows into the reflux tank of the previous tower through the pipe; the condensate in the reflux tank is then reintroduced into the tower body of the previous tower through the pipe, forming a closed-loop energy recovery path. The steam pipe at the top of the Nth separation tower is directly connected to the second reboiler, transferring the remaining energy to the second reboiler. The second reboiler is then connected to the air cooler of the Nth tower through a pipe to ensure that the unused heat can be effectively recovered and reused. The second reboiler is also connected to the reflux tank of the Nth separation tower through a reflux pipe, and finally returns to the tower body.

[0084] Figure 3 Schematic diagram of the structure of the distillation tower system provided in the embodiment of the present application Figure 1 ,like Figure 3As shown, the distillation tower system 300 includes N separation primary towers and one separation secondary tower; the top pipeline of the first separation primary tower 31 is connected to the reboiler 322 of the second separation primary tower 32, and then passes through the air cooler 313 of the first separation primary tower 31, passes through the reflux tank 314, and is connected to the top of the first separation primary tower 31, so as to realize multi-stage utilization of energy. Similarly, the top pipeline of the last separation primary tower 3N is connected to the reboiler 302 of the separation secondary tower 30, and then passes through the air cooler 3N3 of the last separation primary tower 3N, passes through the reflux tank 3N4, and is connected to the top of the last separation primary tower 3N, so as to realize the recycling of energy and save energy.

[0085] The distillation tower system provided by the present application greatly improves the overall energy utilization rate of the system through the series loop design, reducing the need for external heating sources. Since energy is transferred in an orderly manner between towers at each level, each tower can maintain relatively stable temperature and pressure conditions, which is conducive to improving product quality. The temperature difference between towers at each level is fully utilized for heat exchange, reducing the energy consumption cost of the entire system.

[0086] Figure 4 Schematic diagram of the structure of the distillation tower system provided in the embodiment of the present application Figure 2 ,like Figure 4 As shown, the distillation tower system includes: a separation tower 1 and a separation tower 6; wherein the separation tower 1 includes a first reboiler 2, a side collection tank 3 of the separation tower, an air cooler 4 of the separation tower, a reflux tank 5 of the separation tower, a side collection regulating valve 15 of the separation tower, a coil regulating valve 16 of the separation tower, a tower top reflux regulating valve 17 of the separation tower, a lower liquid regulating valve 18 of the separation tower, and a tower top extraction regulating valve 19 of the separation tower; the separation tower 6 includes: a second reboiler 7, an air cooler 8 of the separation tower, a separation tower The condenser 9 of the separation secondary tower, the reflux tank 10 of the separation secondary tower, the side extraction air cooler 11 of the separation secondary tower, the side extraction tank 12 of the separation secondary tower, the coil regulating valve 20 of the separation secondary tower, the top reflux regulating valve 21 of the separation secondary tower, the lower liquid regulating valve 22 of the separation secondary tower, the heat exchanger circulating water outlet regulating valve 23 of the separation secondary tower, the pressure relief regulating valve 24 of the separation secondary tower, the top extraction regulating valve 25 of the separation secondary tower, and the side extraction regulating valve 26 of the separation secondary tower; in addition, there are also the secondary line steam valve 13 and the main line steam valve 14.

[0087] Exemplarily, the kettle of the first separation tower 1 is provided with a first reboiler 2, the feed port of the first separation tower is connected to the first side extraction tank 3 through the first side extraction regulating valve 15, the top extraction of the first separation tower 1 is first connected to the second reboiler 7, then connected to the air cooler 4 of the first separation tower 1, and then connected to the reflux tank 5 of the first separation tower 1 through the lower liquid regulating valve 18 of the first separation tower 1, and then connected to the top extraction of the first separation tower 1 through the top reflux regulating valve 17 of the first separation tower 1; the kettle of the second separation tower 6 is connected to the second reboiler 7, and the reflux tank 5 of the first separation tower 1 is connected to the top extraction regulating valve 1 9 is connected to the feed port of the separation secondary tower 6, the top extraction of the separation secondary tower is first connected to the air cooler 8 of the separation secondary tower 6, and then connected to the condenser 9 of the separation secondary tower 6, and then connected to the reflux tank 10 of the separation secondary tower through the lower liquid regulating valve 22 of the separation secondary tower, and then connected to the top extraction of the separation secondary tower 6 through the tower top reflux regulating valve 21 of the separation secondary tower, the reflux tank 10 of the separation secondary tower is also connected to the pressure relief regulating valve 24 of the separation secondary tower and the pressure relief regulating valve 24 of the separation secondary tower; the side extraction of the separation secondary tower 6 is connected to the side extraction tank 12 of the separation secondary tower through the side extraction air cooler 11 of the separation secondary tower.

[0088] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A distillation tower system, characterized in that the distillation tower system comprises N primary separation towers and N secondary separation towers, where N is a positive integer greater than or equal to 1; The first separation tower is provided with a first controller device, and the first controller device is used to adjust the air cooler and valves in the first separation tower to adjust the pressure and temperature of the tower body of the first separation tower; The secondary separation tower is provided with a second controller device, and the second controller device is used to adjust the air cooler and valves in the secondary separation tower to adjust the pressure and temperature of the tower body of the secondary separation tower.

2. The distillation tower system according to claim 1, characterized in that: The first controller device is specifically used to adjust the air cooler and each valve in the first separation tower to increase the pressure of the tower body of the first separation tower if it is determined that the pressure of the tower body of the first separation tower is less than a first preset pressure threshold; If it is determined that the pressure of the tower body of the first separation tower is greater than the first preset pressure threshold, the air cooler and valves in the first separation tower are adjusted to reduce the pressure of the tower body of the first separation tower.

3. The distillation tower system according to claim 2, characterized in that: The distillation tower system is provided with a secondary steam regulating valve; the first controller device is specifically used to increase the frequency of the air cooler of the first separation tower at a preset adjustment frequency if it is determined that the pressure of the tower body of the first separation tower is less than a first preset pressure threshold, and increase the opening of the top reflux regulating valve of the tower body of the first separation tower, and increase the opening of the lower liquid regulating valve of the first separation tower, and increase the opening of the secondary steam regulating valve.

4. The distillation tower system according to claim 2, characterized in that: The distillation tower system is provided with a bypass steam regulating valve; the first controller device is specifically used to reduce the frequency of the air cooler of the first separation tower at a preset adjustment frequency, and reduce the opening of the top reflux regulating valve of the tower body of the first separation tower, and reduce the opening of the lower liquid regulating valve of the first separation tower, and reduce the opening of the bypass steam regulating valve if it is determined that the pressure of the tower body of the first separation tower is greater than a first preset pressure threshold.

5. The distillation column system according to claim 1, characterized in that: The first controller device is specifically used to adjust the air cooler and each valve in the first separation tower to reduce the temperature of the tower body of the first separation tower if it is determined that the temperature of the tower body of the first separation tower is greater than a first preset temperature threshold; If it is determined that the temperature of the tower body of the first separation tower is lower than the first preset temperature threshold, the air cooler and valves in the first separation tower are adjusted to increase the temperature of the tower body of the first separation tower.

6. The distillation column system according to claim 5, characterized in that: The first controller device is specifically used to increase the opening of the top extraction regulating valve of the first separation tower and reduce the opening of the top reflux regulating valve of the first separation tower and the opening of the coil regulating valve of the first separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the first separation tower is greater than a first preset temperature threshold.

7. The distillation column system according to claim 5, characterized in that: The first controller device is specifically used to reduce the opening of the top extraction regulating valve of the first separation tower and increase the opening of the top reflux regulating valve of the first separation tower and the opening of the coil regulating valve of the first separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the first separation tower is lower than a first preset temperature threshold.

8. The distillation column system according to claim 1, characterized in that: The second controller device is specifically used to adjust the air cooler and each valve in the first separation tower to increase the pressure of the tower body of the second separation tower if it is determined that the pressure of the tower body of the second separation tower is less than the second preset pressure threshold; if it is determined that the pressure of the tower body of the second separation tower is greater than the second preset pressure threshold, then adjust the air cooler and each valve in the second separation tower to reduce the pressure of the tower body of the second separation tower.

9. The distillation column system according to claim 8, characterized in that: The distillation tower system is provided with a main line steam regulating valve and a by-line steam regulating valve; the second controller device is specifically used to increase the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency if it is determined that the pressure of the tower body of the separation secondary tower is less than a second preset pressure threshold, and increase the opening of the lower liquid regulating valve of the separation secondary tower, and increase the opening of the pressure relief regulating valve of the separation secondary tower, and increase the opening of the main line steam regulating valve of the separation secondary tower, and increase the opening of the by-line steam regulating valve of the separation secondary tower.

10. The distillation column system according to claim 8, characterized in that The distillation tower system is provided with a main line steam regulating valve and a by-line steam regulating valve; the second controller device is specifically used to reduce the frequency of the air cooler of the separation secondary tower at a preset adjustment frequency, and reduce the opening of the lower liquid regulating valve of the separation secondary tower, and reduce the opening of the pressure relief regulating valve of the separation secondary tower, and reduce the opening of the main line steam regulating valve of the separation secondary tower, and reduce the opening of the by-line steam regulating valve of the separation secondary tower, if it is determined that the pressure of the tower body of the separation secondary tower is greater than the second preset pressure threshold.

11. The distillation column system according to claim 1, characterized in that: The second controller device is used to adjust the air cooler and each valve in the separation secondary tower to reduce the temperature of the tower body of the separation secondary tower if it is determined that the temperature of the tower body of the separation secondary tower is greater than the second preset temperature threshold; if it is determined that the temperature of the tower body of the separation secondary tower is less than the second preset temperature threshold, then adjust the air cooler and each valve in the separation secondary tower to increase the temperature of the tower body of the separation secondary tower.

12. The distillation column system according to claim 11, characterized in that: The second controller device is specifically used to increase the frequency of the air cooler of the secondary separation tower at a preset adjustment frequency, increase the opening of the top extraction regulating valve of the secondary separation tower, and reduce the opening of the top reflux regulating valve of the secondary separation tower, and reduce the opening of the coil regulating valve of the secondary separation tower, and reduce the opening of the lower liquid regulating valve of the secondary separation tower if it is determined that the temperature of the tower body of the secondary separation tower is greater than the second preset temperature threshold.

13. The distillation column system according to claim 11, characterized in that: The second controller device is specifically used to reduce the frequency of the air cooler of the secondary separation tower and reduce the opening of the top extraction regulating valve of the secondary separation tower at a preset adjustment frequency if it is determined that the temperature of the tower body of the secondary separation tower is lower than the second preset temperature threshold, and increase the opening of the top reflux regulating valve of the secondary separation tower and increase the opening of the coil regulating valve of the secondary separation tower and increase the opening of the lower liquid regulating valve of the secondary separation tower.

14. The distillation column system according to any one of claims 1 to 13, characterized in that: The first separation tower is provided with a first reboiler, and the second separation tower is provided with a second reboiler; The first-stage separation towers in the N first-stage separation towers are connected in sequence; the tower body of the first-stage separation tower in the adjacent first-stage separation towers is connected to the first reboiler in the next first-stage separation tower, and the first reboiler in the next first-stage separation tower is connected to the tower body in the next first-stage separation tower; The tower body of the Nth primary separation tower among the N primary separation towers is connected to the second reboiler, and the second reboiler is connected to the tower body of the secondary separation tower; The energy in the tower body of the previous first-stage separation tower in adjacent first-stage separation towers flows into the tower body of the next first-stage separation tower through the connected first reboiler; the energy in the tower body of the Nth first-stage separation tower flows into the tower body of the second-stage separation tower through the connected second reboiler.

15. The distillation column system according to claim 14, characterized in that: An air cooler is provided in the primary separation tower; Wherein, the air cooler of the first separation tower in the adjacent first separation towers is connected to the first reboiler in the second separation tower; The air cooler of the Nth separation primary tower is connected to the second reboiler.

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