Method for regulating a light-removing device for removing light components from tert-butylamine

Abstract

The application provides a control method of a light component removal device for removing light components in tert-butylamine, comprising the following steps: obtaining a real-time pressure measurement value of a light component removal tower of the light component removal device, a real-time temperature measurement value of a sensitive plate in the light component removal tower, calculating a sensitive plate temperature output value of the sensitive plate according to the real-time pressure measurement value of the light component removal tower, the real-time temperature measurement value of the sensitive plate, a preset pressure of the light component removal tower and a pre-established temperature compensation function; and adjusting a steam flow of a steam input pipeline for inputting steam into a reboiler of the light component removal device according to a comparison result of the sensitive plate temperature output value and a preset temperature of the sensitive plate. The control method of the application helps to improve the situation of light components sliding to the tower kettle, and can improve the stability of the light component removal device and improve the light component removal effect.

Description

Technical Field

[0001] This invention relates to a technology for removing light components from tert-butylamine, and particularly to a method for controlling a light component removal device for removing light components from tert-butylamine. Background Technology

[0002] In the production of tert-butylamine, ammonia and isobutylene react under supercritical conditions to produce a product containing tert-butylamine. After the reaction, the material is cooled and liquefied, then sent to a tert-butylamine removal column for the removal of light components after depressurization. A large amount of light components, such as ammonia and isobutylene, are removed in the removal column. The removed light components are output from the top of the column and recycled back to the upstream reaction system. The tert-butylamine and a small amount of isobutylene in the bottom of the removal column are sent under high pressure to the downstream tert-butylamine distillation column, where further separation yields high-purity tert-butylamine. In existing technology, light components in the removal column tend to slide down to the bottom, causing the content of light components, especially isobutylene, in the tert-butylamine collected from the bottom to fail to meet target requirements. This results in light components such as isobutylene and / or ammonia entering the downstream tert-butylamine distillation column, potentially causing serious consequences such as overpressure in the distillation column. Furthermore, existing technology also easily leads to tert-butylamine entering the top of the column, resulting in waste. Summary of the Invention

[0003] In view of this, the present invention provides a method for controlling a light component removal device for removing light components from tert-butylamine. Using the control method of the present invention helps to improve the situation where light components slide down to the bottom of the column, thereby improving the stability of the light component removal device and the light component removal effect.

[0004] To achieve its objective, the present invention provides the following technical solution:

[0005] This invention provides a method for controlling a light component removal device for removing light components from tert-butylamine, comprising the following steps:

[0006] The real-time pressure measurement value of the light-light removal tower of the light-light removal device and the real-time temperature measurement value of the sensitive plate inside the light-light removal tower are obtained. The sensitive plate temperature output value of the sensitive plate is calculated and determined based on the real-time pressure measurement value of the light-light removal tower, the real-time temperature measurement value of the sensitive plate, the preset pressure of the light-light removal tower and the pre-established temperature compensation function.

[0007] The steam flow rate of the steam input pipe used to introduce steam into the reboiler of the light-weight removal device is adjusted according to the comparison result between the temperature output value of the sensitive plate and the preset temperature of the sensitive plate.

[0008] In some embodiments, the control method further includes the following steps:

[0009] The real-time temperature measurement value of the bottom of the light-light removal tower is obtained, and the bottom temperature output value of the tower is calculated and determined based on the real-time temperature measurement value of the bottom, the real-time pressure measurement value of the light-light removal tower, the preset pressure of the light-light removal tower and the pre-established temperature compensation function.

[0010] When the output temperature of the column bottom is lower than the preset minimum allowable temperature of the column bottom, the collection valve on the tert-butylamine collection pipeline is closed.

[0011] In some implementations, the establishment of the temperature compensation function includes:

[0012] Set the target content requirement for the light component of tert-butylamine collected from the tert-butylamine collection pipeline of the aforementioned light component removal tower;

[0013] Linear function expression I is obtained by linear fitting based on the historical operating parameters of the light component removal tower. The historical operating parameters include the historical temperature of the sensitive plate and the historical pressure of the light component removal tower. The historical pressure of the light component removal tower is the pressure of the light component removal tower required to make the light component content in the tert-butylamine extracted from the light component removal tower meet the target light component content requirement at different historical temperatures of the sensitive plate.

[0014] Substituting the preset pressure of the light removal tower and the preset temperature of the sensitive plate into the linear function expression I, we obtain expression II. Based on the linear function expression I and the expression II, we obtain the temperature correction difference expression.

[0015] The temperature compensation function is established based on the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom, and based on the temperature correction difference expression.

[0016] In some implementations, the linear function expression I is: T = KP + D;

[0017] The expression II is: T0 = KP0 + D

[0018] Subtracting expression II from linear function expression I yields the temperature correction difference expression: △ T = T - T0 = K * (P - P0);

[0019] The temperature compensation function is: Z = T - △ T = TK * (P - P0);

[0020] Wherein, K is the slope of the linear function expression I, D is the intercept of the linear function expression I, P is the real-time pressure measurement value of the light-weight removal tower, P0 is the preset pressure of the light-weight removal tower, T is the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom, T0 is the preset temperature of the sensitive plate, and Z is the temperature output value of the sensitive plate or the temperature output value of the tower bottom.

[0021] In some implementations, the temperature compensation function is Z = TK*(P - P0);

[0022] Wherein, Z is the temperature output value of the sensitive plate or the temperature output value of the tower bottom, K is the temperature compensation coefficient, P is the real-time pressure measurement value of the light-weight removal tower, P0 is the preset pressure of the light-weight removal tower, and T is the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom.

[0023] Preferably, the determination of the temperature compensation coefficient includes:

[0024] Set the target content requirement for the light component of tert-butylamine collected from the tert-butylamine collection pipeline of the aforementioned light component removal tower;

[0025] A linear function is obtained by linear fitting based on the historical operating parameters of the light component removal tower. The historical operating parameters include the historical temperature of the sensitive plate and the historical pressure of the light component removal tower. The historical pressure of the light component removal tower is the pressure required for the light component removal tower to meet the target light component content requirement in the tert-butylamine extracted from the light component removal tower pipeline at different historical temperatures of the sensitive plate. The slope of the linear function is used as the temperature compensation coefficient.

[0026] In some embodiments, the real-time pressure measurement value of the light-weight removal tower is determined by the following method: obtaining the pressure values ​​measured by multiple pressure measuring elements used to measure the pressure inside the light-weight removal tower, and taking the maximum value among the pressure values ​​obtained by each pressure measuring element as the real-time pressure measurement value of the light-weight removal tower;

[0027] The real-time temperature measurement value of the sensitive plate is determined by acquiring the temperature values ​​measured by multiple temperature measuring elements used to measure the temperature of the sensitive plate, and taking the maximum value among the temperature values ​​obtained by each temperature measuring element as the real-time temperature measurement value of the sensitive plate.

[0028] In some implementations, the liquid level measurement value of the bottom of the light-removal tower is obtained, and when the liquid level measurement value is lower than the minimum preset liquid level value of the bottom of the tower, the collection valve is closed.

[0029] In some embodiments, obtaining the liquid level measurement value of the bottom of the light-duty removal tower, and closing the outlet valve when the liquid level measurement value is lower than the preset minimum liquid level value of the bottom of the tower, specifically includes:

[0030] The liquid level measurement values ​​are obtained from multiple bottom liquid level detection elements installed in the light-light removal tower for measuring the liquid level in the bottom of the tower. When the liquid level measurement values ​​obtained from at least two bottom liquid level detection elements are lower than the preset minimum liquid level value, the outlet valve is closed.

[0031] In some embodiments, the content of light components in the tert-butylamine extracted from the tert-butylamine extraction pipeline is detected, and when the content of light components does not meet the target content requirement for light components, the extraction valve on the tert-butylamine extraction pipeline is closed.

[0032] The present invention also provides an electronic device, comprising:

[0033] At least one processor, and

[0034] A memory communicatively connected to the at least one processor; wherein,

[0035] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the control method as described in any one of claims 1-9.

[0036] The technical solution provided by this invention has the following beneficial effects:

[0037] The control method provided by this invention has good control sensitivity, can improve the stability of the light component removal device, reduce the risk of light component slippage, and can effectively prevent light components from slipping downstream and causing adverse effects on downstream processes. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a light component removal device for removing light components from tert-butylamine in one embodiment.

[0039] Figure 2 This is a schematic diagram of the device used to remove light components from tert-butylamine in the comparative example.

[0040] Figure 3 This is a flowchart of the control method of the light removal device in one embodiment of the present invention.

[0041] Figure 4 This is a schematic diagram of the hardware structure of an electronic device in one embodiment. Detailed Implementation

[0042] To facilitate understanding of the present invention, the following description, in conjunction with embodiments, will further illustrate the invention. It should be understood that the following embodiments are merely for a better understanding of the invention and do not imply that the invention is limited to these embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The term "and / or" may be used herein to include any and all combinations of one or more of the associated listed items.

[0044] This invention provides a method for controlling a device used to remove light components from tert-butylamine. See also: Figure 1 The light component removal unit mainly includes a light component removal tower and a reboiler E001. The light component removal tower is equipped with an inlet for the tert-butylamine to be treated, a top outlet for discharging the light component, and a tert-butylamine outlet for collecting the treated tert-butylamine. The tert-butylamine outlet is connected to a tert-butylamine collection pipeline 300, which is equipped with collection valves, such as collection valves LV001 and XV001. The tert-butylamine inlet is connected to the upstream tert-butylamine feed pipeline 100. Reboiler E001 is located beside the light-weight product removal tower. Reboiler E001 is connected to the light-weight product removal tower via circulation pipeline 200. The material in the bottom 400 of the light-weight product removal tower can circulate between reboiler E001 and the light-weight product removal tower via circulation pipeline 200. A steam input pipeline 500 is connected to reboiler E001 for introducing hot steam into it. The material from the bottom 400 enters reboiler E001 via circulation pipeline 200 and exchanges heat with the steam introduced into the reboiler via steam input pipeline 500, thereby heating the material. A steam flow regulating valve FV-001 and a flow meter 600 (e.g., an orifice plate flow meter) are installed on the steam input pipeline 500. The light component removal tower is equipped with a pressure measuring element for measuring the pressure inside the tower, a temperature measuring element for measuring the temperature of the sensitive plate inside the tower, and a liquid level detection element for measuring the liquid level in the bottom 400 of the light component removal tower; an online light component content analyzer is installed on the tert-butylamine outflow pipeline 300.

[0045] The term "sensitive plate" mentioned in the article is a common term in the chemical industry. Those skilled in the art can determine the specific location of the sensitive plate based on their conventional technical knowledge and common sense in the field.

[0046] The method for controlling the light component removal device for removing light components from tert-butylamine provided by the present invention mainly includes the following steps:

[0047] The system acquires the real-time pressure measurement value of the light-light ...

[0048] By determining the sensitive plate temperature output value using the method described above, when the pressure inside the tower fluctuates, the steam flow rate can be adjusted more sensitively based on the sensitive plate temperature output value, effectively preventing light components such as ammonia and isobutylene from sliding down to the downstream system. Specifically, the steam flow rate is adjusted by regulating the opening of the steam flow regulating valve FV-001 installed on the steam input pipe 500. Specifically, when the sensitive plate temperature output value is lower than the preset temperature of the sensitive plate, the steam flow rate of the steam input pipe is increased to raise the sensitive plate temperature output value to the preset temperature; conversely, the steam flow rate of the steam input pipe 500 is decreased to lower the sensitive plate temperature output value to the preset temperature.

[0049] Preferably, the control method provided by the present invention further includes the following steps: obtaining the real-time temperature measurement value of the bottom of the light-light removal tower 400, and calculating and determining the bottom temperature output value of the bottom based on the real-time temperature measurement value of the bottom, the real-time pressure measurement value of the light-light removal tower, the preset pressure of the light-light removal tower and the pre-established temperature compensation function.

[0050] When the reboiler temperature output value is lower than the preset minimum allowable reboiler temperature, the outlet valve on the tert-butylamine outlet pipeline 300 is closed, for example, one or both of outlet valves LV-001 and XV-001, preferably both. This step achieves a reboiler low-temperature interlock. When the reboiler temperature cannot meet the minimum allowable reboiler temperature, such as when the steam flow regulating valve FV-001 on the steam input pipeline 500 malfunctions or the temperature of the tert-butylamine feed material is too low, the removal effect of light components will be affected, easily causing more light components to slide into the reboiler 400. By closing the outlet valve through the reboiler low-temperature interlock and cutting off the outlet, more light components can be prevented from sliding down the tert-butylamine outlet pipeline into the downstream system, such as preventing them from sliding into the downstream tert-butylamine distillation column, thereby avoiding adverse consequences for the operation of the downstream process. If the bottom temperature of the column is too low, the content of light components in the tert-butylamine produced will be too high, even exceeding the processing capacity of the downstream tert-butylamine distillation column. The minimum allowable temperature of the column bottom can be set as the bottom temperature at which the content of light components in the tert-butylamine produced from the light component removal column reaches the maximum allowable content of light components in the tert-butylamine feed for the downstream tert-butylamine distillation column. The minimum allowable temperature of the column bottom can be determined through small-scale tests.

[0051] Specifically, in the control method of the present invention, the establishment of the temperature compensation function includes the following steps:

[0052] Set the target content requirement for the light component of tert-butylamine extracted from the tert-butylamine extraction pipeline 300 in the light component removal tower;

[0053] The linear function expression I is obtained by linear fitting based on the historical operating parameters of the light component removal tower. The historical operating parameters include the historical temperature of the sensitive plate and the historical pressure of the light component removal tower. The historical pressure of the light component removal tower is the pressure of the light component removal tower required to make the light component content in the tert-butylamine extracted from the light component removal tower pipeline meet the target light component content requirements at different historical temperatures of the sensitive plate.

[0054] Substituting the preset pressure of the light tower and the preset temperature of the sensitive plate into the linear function expression I, we obtain expression II. Based on the linear function expression I and expression II, we obtain the temperature correction difference expression.

[0055] The temperature compensation function is established based on the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom, and based on the temperature correction difference expression.

[0056] In some specific embodiments, the linear function expression I is: T = KP + D, where K is the slope of the linear function and D is the intercept of the linear function. Substituting the preset pressure P0 of the light-weight removal tower and the preset temperature T0 of the sensitive plate into the linear function expression I yields expression II, which is T0 = KP0 + D. Subtracting expression II from linear function expression I yields the temperature correction difference expression, which is... △ T = T - T0 = K * (P - P0). Therefore, the temperature compensation function is: Z = T - △ T = TK*(P-P0); where Z is the temperature output value of the sensitive plate or the temperature output value of the tower bottom, K is the slope of the linear function, P is the real-time pressure measurement value of the light-weight removal tower, P0 is the preset pressure of the light-weight removal tower, and T is the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom.

[0057] The slope of the linear function can also be called the temperature compensation coefficient. The determination of the temperature compensation coefficient is the same as the determination of the slope of the linear function mentioned above. Specifically: set the target content requirement of light components of tert-butylamine extracted from the tert-butylamine extraction pipeline of the light component removal tower; obtain the linear function by linear fitting based on the historical operating parameters of the light component removal tower. The historical operating parameters include the historical temperature of the sensitive plate and the historical pressure of the light component removal tower. The historical pressure of the light component removal tower is the pressure of the light component removal tower required to meet the target content requirement of light components in the tert-butylamine extracted from the tert-butylamine extraction pipeline at different historical temperatures of the sensitive plate; and use the slope of the linear function as the temperature compensation coefficient.

[0058] By establishing a sensitive plate temperature compensation based on pressure fluctuations within the light-weight removal tower using the aforementioned temperature compensation function, the sensitive plate temperature output value is determined. The steam flow rate is then adjusted based on the comparison between the sensitive plate temperature output value and the preset temperature of the sensitive plate. This significantly improves the control sensitivity, enhances the system robustness, avoids frequent triggering of the tower bottom low-temperature interlock and low-liquid-level interlock mentioned in the text, improves system operational stability, and extends the normal operation cycle of the process.

[0059] In the control method of the present invention, preferably, the real-time pressure measurement value of the light component removal tower is determined by the following method: obtaining the pressure values ​​measured by multiple pressure measuring elements used to measure the pressure inside the light component removal tower, and taking the maximum value among the pressure values ​​obtained by each pressure measuring element as the real-time pressure measurement value of the light component removal tower. Using this method to determine the real-time pressure measurement value of the light component removal tower can avoid the risk of a low measurement value due to a single pressure gauge malfunction or blockage, leading to the failure to compensate the temperature of the sensitive plate in time and causing the light component to slip off.

[0060] In the control method of the present invention, preferably, the real-time temperature measurement value of the sensitive plate is determined by the following method: acquiring the temperature values ​​measured by multiple temperature sensing elements used to measure the temperature of the sensitive plate, and taking the maximum value among the temperature values ​​obtained by each temperature sensing element as the real-time temperature measurement value of the sensitive plate. Using this method to determine the real-time temperature measurement value of the sensitive plate can avoid the risk of inaccurate measurement caused by a single thermometer malfunction, resulting in the inability to adjust the steam flow in a timely manner.

[0061] In a preferred embodiment of the control method of the present invention, the method further includes the following steps: obtaining the liquid level measurement value of the bottom 400 of the light-light removal tower; when the liquid level measurement value is lower than the preset minimum liquid level value of the bottom 400, closing the outlet valve, for example, closing the outlet valve LV-001. Preferably, this step specifically includes: obtaining the liquid level measurement values ​​from multiple bottom liquid level detection elements installed in the light-light removal tower for measuring the liquid level in the bottom; when the liquid level measurement values ​​obtained from at least two bottom liquid level detection elements are lower than the preset minimum liquid level value, closing the outlet valve. In the light-light removal unit, tert-butylamine in the light-light removal tower is extracted via pressure differential and sent to the downstream system, for example, to a downstream distillation tower for further processing. The present invention achieves liquid level interlocking through the above steps, preventing high-pressure gas phase from entering the downstream tert-butylamine distillation tower when the bottom liquid level is too low, causing overpressure rupture. The present invention, through low liquid level interlocking, promptly closes the outlet valve to prevent gas leakage.

[0062] The control method of the present invention preferably further includes the following steps: obtaining the light component content detection value of the tert-butylamine extracted from the tert-butylamine extraction pipeline 300; when the light component content detection value does not meet the target light component content requirement, closing the extraction valve on the tert-butylamine extraction pipeline 300, for example, closing extraction valve XV-001. Specifically, the light component content measurement value can be obtained in real time by an online light component content analyzer installed on the tert-butylamine extraction pipeline 300. When the total amount of light components in the incoming tert-butylamine is too large, there may be light component slippage. This step can further reduce the risk of light components slipping into the downstream system.

[0063] Regarding the aforementioned control methods, the preset values ​​involved, such as the preset temperature of the sensitive plate, the preset minimum allowable temperature of the tower bottom, and the preset pressure of the light component removal tower, can be specifically designed and determined in advance by those skilled in the art according to the process target requirements, such as the target content requirement of the light component of tert-butylamine extracted from the tert-butylamine extraction pipeline.

[0064] This invention, through the aforementioned control method, establishes a sensitive plate temperature compensation based on pressure fluctuations within the light component removal tower using a temperature compensation function. This determines the sensitive plate temperature output value, and the steam flow rate is adjusted based on the comparison between the sensitive plate temperature output value and the preset temperature of the sensitive plate. This improves control sensitivity and system operational stability. In a preferred embodiment, further integration with low-temperature interlocking at the tower bottom, low-liquid-level interlocking, and a tap valve interlocking based on light component content measurements further reduces the risk of light component slippage. This provides at least the following beneficial effects: 1. Reduces the risk of light component slippage, preventing excessive light components (ammonia and / or isobutylene) from slipping into the downstream high-vacuum tert-butylamine distillation tower. This avoids consequences such as increased pressure, tray overturning, or even overpressure within the distillation tower, or tert-butylamine failing to vaporize to the top of the distillation tower, resulting in the product falling into the tower bottom and entering the incineration system along with heavier components. 2. Reduces the possibility of tert-butylamine distilling out with light components to the top of the light component removal tower, leading to waste of the target product.

[0065] In some implementations, exemplarily, see, for example, see Figure 1The light-weight removal device specifically includes: pressure display instruments PI001-A and PI001-B for displaying the pressure measurement value inside the light-weight removal tower; temperature display instruments TI001-A and TI001-B for displaying the temperature measurement value of the sensitive plate; and a temperature display instrument TI002-A for displaying the temperature measurement value of the tower bottom. It also includes a control unit, which comprises a controller, a sensitive plate temperature high-selectivity module TY001-A, a sensitive plate temperature calculation module TY001, a tower bottom temperature calculation module TY002-A, and a light-weight removal tower pressure high-selectivity module PY001. The sensitive plate temperature high-selectivity module TY001-A selects the maximum value of the sensitive plate temperature measurement values ​​output by TI001-A and TI001-B as the real-time temperature measurement value of the sensitive plate. The light-weight removal tower pressure high-selectivity module PY001 selects the maximum value of the pressure measurement values ​​inside the light-weight removal tower output by PI001-A and PI001-B as the real-time pressure measurement value of the light-weight removal tower. The sensitive plate temperature calculation module TY001 is used to calculate the sensitive plate temperature output value. The column bottom temperature calculation module TY002-A is used to calculate the column bottom temperature output value. The controller adjusts the steam flow rate of the steam input pipeline used to introduce steam into the reboiler of the light nitrate removal unit based on the comparison result between the sensitive plate temperature output value and the preset temperature of the sensitive plate. For example, the controller TIC001 sends a command to the steam flow controller FIC001 to adjust the opening of the steam flow regulating valve FV-001. The controller can also close the outlet valve LV-001 on the tert-butylamine outlet pipeline when the column bottom temperature output value is lower than the preset minimum allowable temperature of the column bottom. Furthermore, a column bottom liquid level display instrument LI002A / B / C can be provided to display and output the column bottom liquid level measurement values ​​obtained from three liquid level detectors. The controller is also used to close the outlet valve LV-001 when at least two column bottom liquid level measurement values ​​are lower than the minimum liquid level preset value. Specifically, a liquid level controller LIC001 may be provided to regulate the production valve LV-001. Specifically, an alarm AI001 may be provided to display the detected value of the light component content in the tower bottom and to sound an alarm when the detected value of the light component content does not meet the target content requirement; the production valve XV-001 can be closed based on the alarm from this alarm; for example, the production valve XV-001 can be manually closed based on the alarm signal from the alarm AI001, or the controller can also control the production valve XV-001 to close when the detected value of the light component content in the tert-butylamine produced from the tert-butylamine production pipeline does not meet the target content requirement.

[0066] In practical applications, the above-mentioned control method provided by the present invention can be implemented using an automatic control system.

[0067] The present invention also provides an electronic device, comprising: at least one processor 401; and a memory 402 communicatively connected to the at least one processor 401; wherein the memory 402 stores instructions executable by the at least one processor 401, and the instructions, when executed by the at least one processor 401, enable the at least one processor 401 to perform the corresponding control steps involved in the aforementioned control method of the present invention:

[0068] The real-time pressure measurement value of the light-light removal tower of the light-light removal device and the real-time temperature measurement value of the sensitive plate inside the light-light removal tower are obtained. The sensitive plate temperature output value of the sensitive plate is calculated and determined based on the real-time pressure measurement value of the light-light removal tower, the real-time temperature measurement value of the sensitive plate, the preset pressure of the light-light removal tower and the pre-established temperature compensation function.

[0069] The steam flow rate of the steam input pipe used to introduce steam into the reboiler of the light-weight removal device is adjusted according to the comparison result between the temperature output value of the sensitive plate and the preset temperature of the sensitive plate.

[0070] Further explanation of the control methods can be found in the preceding description and will not be repeated here. These control steps include, but are not limited to, adjusting the steam flow rate in the steam input pipeline 500 and controlling the output valve.

[0071] Figure 4 The example shown is a processor 401. The electronic device is preferably a controller. The electronic device may also include an input device 403 and an output device 404. The processor 401, memory 402, input device 403, and output device 404 can be connected via a bus or other means; the example shown is a bus connection.

[0072] The memory 402 can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions / modules corresponding to the steps in the control method of this application, such as the program instructions / modules corresponding to the control method mentioned above. The processor 401 executes various functional applications and data processing by running the non-volatile software programs, instructions, and modules stored in the memory 402, thereby realizing the control method of the present invention. The memory 402 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created by using the control method according to the present invention, etc. In addition, the memory 402 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. The input device 403 can receive user clicks and generate signal inputs related to user settings and function control of the method of the present invention. The output device 404 may include a display screen or other display device.

[0073] In some embodiments, the control method of the present invention can be implemented by a control system with corresponding calculation and control functions, such as a PID control system. The controller is connected in communication with the steam input pipeline 500, which is equipped with a steam flow regulating valve FV-001, a pressure measuring element for measuring the pressure in the light component removal tower, a temperature measuring element for measuring the temperature of the sensitive plate in the light component removal tower, a liquid level detection element for measuring the liquid level in the bottom of the light component removal tower, an online light component content analyzer for determining the light component content in the tert-butylamine produced by the tert-butylamine production pipeline, and production valves LV-001 and XV-001 installed on the production pipeline.

[0074] The present invention will be further illustrated by specific application examples below.

[0075] Example 1

[0076] In the upstream process, ammonia and isobutylene react to produce tert-butylamine, which, after cooling, becomes a liquid product. This liquid product is then fed into the light-light ... Figure 1 For details regarding this device not described in detail, please refer to the corresponding content above. Unreacted ammonia and isobutylene are removed from the light-light removal tower and discharged from the top outlet. The treated tert-butylamine obtained from the bottom of the tower (400) is collected from the tert-butylamine collection outlet and sent to the downstream tert-butylamine distillation tower via the tert-butylamine collection pipeline (300). In this embodiment, the specific steps of the control method implemented for the light-light removal unit, unless otherwise specified, are described in the preceding text and will not be repeated here.

[0077] 1) Establish a temperature compensation function

[0078] The target content requirement for the light component of tert-butylamine extracted from the tert-butylamine extraction pipeline 300 in the light component removal tower is set as follows: isobutylene content < 5 ppm.

[0079] To achieve the aforementioned target content requirements, the required pressure (i.e., historical pressure) of the light-light content removal tower was recorded at different temperatures (i.e., historical temperatures) on the sensitive plate of the light-light content removal tower, resulting in a series of historical temperature values ​​T listed in Table 1 below. 历史 Historical pressure value P 历史 :

[0080] Table 1

[0081]

[0082] By performing linear fitting on the historical temperatures and historical pressures listed in Table 1, we obtain the linear equation T = KP + 110.63 (Formula 1), where K is 28.922, corresponding to the slope of the linear equation.

[0083] From the above linear equation, we can obtain: T0=KP0+110.63 (Equation 2)

[0084] P0 is the preset pressure of the light component removal tower required to achieve the above-mentioned target content requirement for light components under a certain actual working condition (hereinafter referred to as the preset pressure of the light component removal tower).

[0085] T0 is the preset temperature of the sensitive plate required to achieve the target content of the light components in a certain actual working condition (hereinafter referred to as the preset temperature of the sensitive plate).

[0086] Subtracting Formula 2 from Formula 1 yields T-T0 = 28.922*(P-P0), where T-T0 is the correction difference ΔT. Thus, the expression for the temperature correction difference of the sensitive plate is: ΔT = 28.922*(P-P0).

[0087] Therefore, the temperature correction function for the sensitive plate is obtained: Z = T - ΔT 校正 =T-28.922*(P-P0), where Z is the temperature output value of the sensitive plate (unit: °C), 28.922 is the slope of the aforementioned linear equation, P is the real-time pressure measurement value of the light-light removal tower (unit: MPaG), P0 is the preset pressure of the light-light removal tower (unit: MPaG), and T is the real-time temperature measurement value of the sensitive plate (unit: °C).

[0088] In this embodiment, the real-time temperature output value of the column bottom is directly adopted using the temperature correction function of the sensitive plate established above, Z=T-28.922*(P-P0). When this function is used to determine the real-time temperature output value of the column bottom, T corresponds to the real-time temperature measurement value of the column bottom (unit °C).

[0089] 2) Under a certain operating condition, the target content of the light component of tert-butylamine collected from the tert-butylamine collection pipeline of the light component removal tower is required to be isobutylene content < 5 ppm. The preset pressure P0 of the light component removal tower is 1.95 MPaG, the preset temperature T0 of the sensitive plate is 170.2℃, and the preset minimum allowable temperature of the tower bottom is 140℃. The light component removal tower is equipped with two pressure measuring elements, and the maximum pressure value measured by the two elements is taken as the real-time pressure measurement value of the light component removal tower. It is also equipped with two temperature measuring elements for measuring the temperature of the sensitive plate, and the maximum temperature value is taken as the real-time temperature measurement value of the sensitive plate. Three tower bottom liquid level detection elements are provided. When the tower bottom liquid level measurement values ​​measured by two of the tower bottom liquid level detection elements are both lower than the preset minimum liquid level value of the tower bottom, the collection valve LV-001 is closed.

[0090] The specific control steps are described above and will not be repeated here; the temperature output values ​​of the sensitive plate and the tower bottom are determined based on the temperature compensation function established in the previous section "1) Establishing the temperature compensation function".

[0091] For example, during the implementation of this embodiment, the pressure of the light-weight removal tower fluctuates. The pressure values ​​measured by the two pressure measuring elements are 1.9 MPaG and 2.05 MPaG, respectively. The maximum value of 2.05 MPaG is taken as the real-time pressure measurement value of the light-weight removal tower. The temperatures of the sensitive plate measured by the two temperature measuring elements are 170.2℃ and 170.1℃, respectively. The maximum value of 170.2℃ is taken as the real-time temperature measurement value of the sensitive plate. The real-time pressure measurement value of the light-weight removal tower and the real-time temperature measurement value of the sensitive plate are substituted into the temperature compensation function established in the previous steps. In the calculation, the temperature output value of the sensitive plate was 167.3℃. Comparing this value with the preset temperature T0 (170.2℃), it can be seen that the temperature output value of the sensitive plate is lower than the preset temperature T0. The opening of the steam flow regulating valve FV-001 is increased, and the steam flow rate is increased from 15kg / h to 16.5kg / h, so that the temperature output value of the sensitive plate rises to the preset temperature T0. Finally, the content of the light component isobutylene in the tert-butylamine extracted from the pipeline is <2ppm, which meets the target content requirement of the light component (i.e., isobutylene content <5ppm).

[0092] Comparative Example 1

[0093] See Figure 2 This is a schematic diagram of the light-weight removal device used in this comparative example. The main difference from Example 1 is that the real-time temperature measurement value of the sensitive plate is directly compared with the preset temperature T0 of the sensitive plate, and the steam flow rate is adjusted according to the comparison result. In a certain operating condition, the pressure values ​​measured by the two pressure sensing elements are 1.9 MPaG and 2.0 MPaG, respectively; the temperatures of the sensitive plate measured by the two temperature sensing elements are 170.2℃ and 170.1℃, respectively. The maximum value, 170.2℃, is taken as the real-time temperature measurement value of the sensitive plate. The real-time temperature measurement value of the sensitive plate was compared with the preset temperature T0 (170.2℃), and the two were consistent. Therefore, the steam flow rate was not adjusted and was maintained at 15kg / h. As a result, the content of light component (isobutylene) in the tert-butylamine collected from the pipeline climbed to 355ppm, which could not meet the target light component content requirement. This caused a large amount of light component to slide down to the downstream system, which brought about a significant safety hazard. There was also the possibility that the tert-butylamine in the downstream distillation column could not be vaporized to the top of the column, resulting in product waste.

[0094] It is readily understood that the above embodiments are merely illustrative examples for clear explanation and do not imply that the invention is limited thereto. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for controlling a light component removal device for removing light components from tert-butylamine, characterized in that, Includes the following steps: The real-time pressure measurement value of the light-light removal tower of the light-light removal device and the real-time temperature measurement value of the sensitive plate inside the light-light removal tower are obtained. The sensitive plate temperature output value of the sensitive plate is calculated and determined based on the real-time pressure measurement value of the light-light removal tower, the real-time temperature measurement value of the sensitive plate, the preset pressure of the light-light removal tower and the pre-established temperature compensation function. The steam flow rate of the steam input pipe used to introduce steam into the reboiler of the light-weight removal device is adjusted according to the comparison result between the temperature output value of the sensitive plate and the preset temperature of the sensitive plate. The control method further includes the following steps: The real-time temperature measurement value of the bottom of the light-light removal tower is obtained, and the bottom temperature output value of the tower is calculated and determined based on the real-time temperature measurement value of the bottom, the real-time pressure measurement value of the light-light removal tower, the preset pressure of the light-light removal tower and the pre-established temperature compensation function. When the output temperature of the column bottom is lower than the preset minimum allowable temperature of the column bottom, the collection valve on the tert-butylamine collection pipeline is closed. The establishment of the temperature compensation function includes: Set the target content requirement for the light component of tert-butylamine collected from the tert-butylamine collection pipeline of the aforementioned light component removal tower; Linear function expression I is obtained by linear fitting based on the historical operating parameters of the light component removal tower. The historical operating parameters include the historical temperature of the sensitive plate and the historical pressure of the light component removal tower. The historical pressure of the light component removal tower is the pressure of the light component removal tower required to make the light component content in the tert-butylamine extracted from the light component removal tower meet the target light component content requirement at different historical temperatures of the sensitive plate. Substituting the preset pressure of the light removal tower and the preset temperature of the sensitive plate into the linear function expression I, we obtain expression II. Based on the linear function expression I and the expression II, we obtain the temperature correction difference expression. The temperature compensation function is established based on the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom, and based on the temperature correction difference expression; The temperature compensation function is: Z = TK (P-P0); Wherein, K is the slope of the linear function expression I, P is the real-time pressure measurement value of the light-weight removal tower, P0 is the preset pressure of the light-weight removal tower, T is the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom, and Z is the temperature output value of the sensitive plate or the temperature output value of the tower bottom.

2. The control method according to claim 1, characterized in that, The linear function expression I is: T = KP + D; The expression II is: T0 = KP0 + D Subtracting expression II from linear function expression I yields the temperature correction difference expression: ΔT = T - T0 = K (P-P0); The temperature compensation function is: Z = T - ΔT = TK (P-P0); Wherein, K is the slope of the linear function expression I, D is the intercept of the linear function expression I, P is the real-time pressure measurement value of the light-weight removal tower, P0 is the preset pressure of the light-weight removal tower, T is the real-time temperature measurement value of the sensitive plate or the real-time temperature measurement value of the tower bottom, T0 is the preset temperature of the sensitive plate, and Z is the temperature output value of the sensitive plate or the temperature output value of the tower bottom.

3. The control method according to any one of claims 1-2, characterized in that, The real-time pressure measurement value of the light-weight removal tower is determined by the following method: obtaining the pressure values ​​measured by multiple pressure measuring elements used to measure the pressure inside the light-weight removal tower, and taking the maximum value among the pressure values ​​obtained by each pressure measuring element as the real-time pressure measurement value of the light-weight removal tower; The real-time temperature measurement value of the sensitive plate is determined by acquiring the temperature values ​​measured by multiple temperature measuring elements used to measure the temperature of the sensitive plate, and taking the maximum value among the temperature values ​​obtained by each temperature measuring element as the real-time temperature measurement value of the sensitive plate.

4. The control method according to any one of claims 1-2, characterized in that, Obtain the liquid level measurement value of the bottom of the light-weight removal tower. When the liquid level measurement value is lower than the minimum preset liquid level value of the bottom of the tower, close the outlet valve.

5. The control method according to claim 4, characterized in that, The step of obtaining the liquid level measurement value of the bottom of the light-weight removal tower, and closing the outlet valve when the liquid level measurement value is lower than the preset minimum liquid level value of the bottom of the tower, specifically includes: The liquid level measurement values ​​are obtained from multiple bottom liquid level detection elements installed in the light-light removal tower for measuring the liquid level in the bottom of the tower. When the liquid level measurement values ​​obtained from at least two bottom liquid level detection elements are lower than the preset minimum liquid level value, the outlet valve is closed.

6. The control method according to any one of claims 1-2, characterized in that, Obtain the light component content detection value in the tert-butylamine extracted from the tert-butylamine extraction pipeline. When the light component content detection value does not meet the target content requirement for light components, close the extraction valve on the tert-butylamine extraction pipeline.

7. An electronic device, characterized in that, include: At least one processor, and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the control method as described in any one of claims 1-6.

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