A distillation column pressure control method and system

Abstract

The application discloses a rectifying tower pressure control method and system, and relates to the technical field of rectifying tower automatic control, wherein the method comprises the following steps: obtaining a tower pressure control task, and analyzing the tower pressure control task to obtain a corresponding regulation and control pressure value; collecting a real-time pressure value of a to-be-processed rectifying tower, comparing the real-time pressure value with the regulation and control pressure value to obtain a corresponding difference value, and performing tower pressure control according to the difference value; and the application adjusts the tower pressure of the rectifying tower according to the regulation and control pressure value, and then adjusts the tower pressure again after considering the pressure fluctuation, thereby improving the sensitivity of the rectifying tower to interference factors.

Description

Technical Field

[0001] This invention relates to the field of automated control technology for distillation columns, and more specifically to a method and system for controlling the pressure of a distillation column. Background Technology

[0002] Currently, a distillation column is a type of tower-shaped gas-liquid contact device used for distillation. It utilizes the property that the components in a mixture have different volatility, i.e., different vapor pressures at the same temperature, to transfer lighter components (low-boiling substances) from the liquid phase to the gas phase, while heavier components (high-boiling substances) from the gas phase transfer to the liquid phase, thus achieving separation.

[0003] However, in the actual operation of a distillation column, fluctuations in the column pressure can disrupt the gas-liquid phase equilibrium and heat balance. If the column pressure is not controlled and regulated in a timely manner, it may have a significant impact on the quality of subsequent products, while also leading to increased energy and material consumption. The existing column pressure regulation process only performs one adjustment and does not consider the impact of subsequent disturbances on the column pressure, thus failing to regulate in a timely manner and disrupting the material balance within the column.

[0004] Therefore, how to provide a distillation column pressure control method that can solve the above problems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a distillation column pressure control method and system, which adjusts the distillation column pressure according to the control pressure value, and then readjusts the column pressure after considering pressure fluctuations, thereby improving the sensitivity of the distillation column to interference factors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for controlling the pressure of a distillation column includes the following steps:

[0008] Obtain the tower pressure control task, and parse the tower pressure control task to obtain the corresponding regulating pressure value;

[0009] The real-time pressure value of the distillation column to be processed is collected and compared with the control pressure value to obtain the corresponding difference. The column pressure is controlled based on the difference.

[0010] Preferably, the specific process of pressure control based on the difference includes:

[0011] When the difference is equal to zero, the tower pressure control task is determined to be a constant pressure operation, and no control processing is performed.

[0012] When the difference is greater than zero, it is determined that the distillation column to be processed needs to be pressurized.

[0013] When the difference is less than zero, it is determined that the distillation column to be processed needs to be depressurized.

[0014] Preferably, the specific processing after pressure control is completed also includes:

[0015] The real-time pressure value of the distillation column to be processed is obtained again, and the corresponding real-time difference is obtained based on the control pressure value and the real-time pressure value.

[0016] If the real-time difference is less than or equal to a preset threshold, no processing is performed;

[0017] When the real-time difference is greater than a preset threshold, the pressure value of the first distillation column connected to the distillation column to be processed is obtained, and the distillation column to be processed is pressurized according to the working state of the first distillation column.

[0018] Preferably, the specific process of pressurizing the distillation column to be processed according to the operating state of the first distillation column includes:

[0019] When the real-time difference is continuously greater than a preset threshold within a preset time interval, the working status of the first distillation column connected to the distillation column to be processed is obtained at this time.

[0020] When the first distillation column is operating under pressurized or constant pressure conditions, the first distillation column is controlled to provide pressure to the distillation column to be processed.

[0021] When the first distillation column is operating under reduced pressure, the current operating status of the second distillation column connected to the distillation column to be processed is obtained, and the pressure control of the distillation column to be processed is realized according to the current operating status of the second distillation column.

[0022] Preferably, if the second distillation column is still unable to provide pressure to the distillation column to be processed, the distillation column to be processed is pressurized again.

[0023] Preferably, the specific process for determining that the distillation column to be treated needs to undergo depressurization includes:

[0024] After the pressure reduction treatment is completed, the real-time pressure value of the distillation column to be treated is acquired again, and the corresponding real-time difference value is obtained according to the control pressure value and the real-time pressure value.

[0025] The pressure of the distillation column to be processed is controlled again based on the real-time difference value.

[0026] The present invention also provides a control system utilizing the distillation column pressure control method described in any one of the above six claims, comprising:

[0027] The acquisition module is used to acquire the tower pressure control task and parse the tower pressure control task to obtain the corresponding control pressure value;

[0028] The control module is used to collect the real-time pressure value of the distillation column to be processed, compare it with the control pressure value to obtain the corresponding difference, and control the column pressure based on the difference.

[0029] Preferably, the control module includes:

[0030] A first control unit is configured to not perform any operation when the difference is equal to zero;

[0031] The second control unit is used to determine that the distillation column to be processed needs to be pressurized when the difference is greater than zero.

[0032] The third control unit is used to determine that the distillation column to be processed needs to be depressurized when the difference is less than zero.

[0033] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a distillation column pressure control method and system, which can realize the control of the column top pressure. First, the column pressure of the distillation column to be processed is controlled according to the control pressure value. After the pressure control is completed, the real-time pressure value is collected. When the pressure value fluctuation is greater than the preset threshold within the preset time interval, the pressure is readjusted again. The above two-adjustment method improves the sensitivity of the system to pressure disturbances and prevents frequent pressurization and depressurization due to small fluctuations in some data, thereby improving the service life of the equipment. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This invention provides an overall flow chart of a distillation column pressure control method;

[0036] Figure 2 The present invention provides a structural principle block diagram of a distillation column pressure control system. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] See appendix Figure 1 As shown in the figure, an embodiment of the present invention discloses a method for controlling the pressure of a distillation column, comprising the following steps:

[0039] Obtain the tower pressure control task, parse the tower pressure control task, and obtain the corresponding control pressure value;

[0040] The real-time pressure value of the distillation column to be processed is collected and compared with the control pressure value to obtain the corresponding difference. The column pressure is then controlled based on the difference.

[0041] In one specific embodiment, the process of pressure control based on the difference includes:

[0042] When the difference is zero, the tower pressure control task is determined to be a constant pressure operation, and no control processing is performed.

[0043] When the difference is greater than zero, it is determined that the distillation column to be processed needs to be pressurized.

[0044] When the difference is less than zero, it is determined that the distillation column to be processed needs to be depressurized.

[0045] In one specific embodiment, the subsequent processing after pressure control also includes:

[0046] The real-time pressure value of the distillation column to be processed is obtained again, and the corresponding real-time difference is obtained based on the control pressure value and the real-time pressure value.

[0047] If the real-time difference is less than or equal to the preset threshold, no action will be taken;

[0048] When the real-time difference is greater than the preset threshold, the pressure value of the first distillation column connected to the distillation column to be processed is obtained, and the distillation column to be processed is pressurized according to the working status of the first distillation column.

[0049] In a specific embodiment, the specific process of pressurizing the distillation column to be processed according to the operating state of the first distillation column includes:

[0050] When the real-time difference continues to be greater than the preset threshold within a preset time interval, the working status of the first distillation column connected to the distillation column to be processed is obtained at this time.

[0051] When the first distillation column is operating under pressurized or constant pressure conditions, the pressure supplied by the first distillation column to the distillation column to be processed is controlled.

[0052] When the first distillation column is operating under reduced pressure, the current operating status of the second distillation column connected to the distillation column to be processed is obtained, and the column pressure control of the distillation column to be processed is realized based on the current operating status of the second distillation column.

[0053] In one specific embodiment, if the second distillation column is still unable to provide pressure to the distillation column to be processed, the distillation column to be processed is pressurized again.

[0054] In a specific embodiment, the specific process for determining that the distillation column to be processed needs to undergo depressurization includes:

[0055] After the pressure reduction treatment is completed, the real-time pressure value of the distillation column to be treated is obtained again, and the corresponding real-time difference value is obtained according to the control pressure value and the real-time pressure value.

[0056] Based on the real-time difference value, the pressure of the distillation column to be treated is controlled again. The specific process includes:

[0057] No operation is performed when the real-time difference value is lower than the preset threshold; when the real-time difference value is consistently higher than the preset threshold within the preset time interval, pressure processing is performed.

[0058] See appendix Figure 2 As shown, this embodiment of the invention also provides a control system for a distillation column pressure control method utilizing any of the above-mentioned methods, comprising:

[0059] The acquisition module is used to acquire tower pressure control tasks, parse the tower pressure control tasks, and obtain the corresponding control pressure values;

[0060] The control module is used to collect the real-time pressure value of the distillation column to be processed, compare it with the control pressure value to obtain the corresponding difference, and control the column pressure based on the difference.

[0061] In one specific embodiment, the control module includes:

[0062] The first control unit is configured to not perform any operation when the difference is equal to zero.

[0063] The second control unit is used to determine that the distillation column to be processed needs to be pressurized when the difference is greater than zero.

[0064] The third control unit is used to determine that the distillation column to be processed needs to be depressurized when the difference is less than zero.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the pressure of a distillation column, characterized in that, Includes the following steps: Obtain the tower pressure control task, and parse the tower pressure control task to obtain the corresponding regulating pressure value; The real-time pressure value of the distillation column to be processed is collected and compared with the controlled pressure value to obtain the corresponding difference. The column pressure is controlled based on the difference. The specific process includes: When the difference is equal to zero, the tower pressure control task is determined to be a constant pressure operation, and no control processing is performed. When the difference is greater than zero, it is determined that the distillation column to be processed needs to be pressurized. When the difference is less than zero, it is determined that the distillation column to be processed needs to be depressurized. The specific processing steps after pressure control are completed also include: The real-time pressure value of the distillation column to be processed is obtained again, and the corresponding real-time difference is obtained based on the control pressure value and the real-time pressure value. If the real-time difference is less than or equal to a preset threshold, no processing is performed; When the real-time difference is greater than a preset threshold, the pressure value of the first distillation column connected to the distillation column to be processed is obtained at this time. Based on the operating state of the first distillation column, the distillation column to be processed is pressurized. The specific processing procedure includes: When the real-time difference is continuously greater than a preset threshold within a preset time interval, the working status of the first distillation column connected to the distillation column to be processed is obtained at this time. When the first distillation column is operating under pressurized or constant pressure conditions, the first distillation column is controlled to provide pressure to the distillation column to be processed. When the first distillation column is operating under reduced pressure, the current operating status of the second distillation column connected to the distillation column to be processed is obtained, and the pressure control of the distillation column to be processed is realized according to the current operating status of the second distillation column.

2. The distillation column pressure control method according to claim 1, characterized in that, If the second distillation column is still unable to provide pressure to the distillation column to be processed, then the distillation column to be processed is pressurized again.

3. The distillation column pressure control method according to claim 1, characterized in that, The specific process for determining that the distillation column to be treated needs to undergo depressurization includes: After the pressure reduction treatment is completed, the real-time pressure value of the distillation column to be treated is acquired again, and the corresponding real-time difference value is obtained according to the control pressure value and the real-time pressure value. The pressure of the distillation column to be processed is controlled again based on the real-time difference value.

4. A control system utilizing the distillation column pressure control method according to any one of claims 1-3, characterized in that, include: The acquisition module is used to acquire the tower pressure control task and parse the tower pressure control task to obtain the corresponding control pressure value; The control module is used to acquire the real-time pressure value of the distillation column to be processed, compare it with the controlled pressure value to obtain the corresponding difference, and control the column pressure based on the difference, including: A first control unit is configured to not perform any operation when the difference is equal to zero; The second control unit is used to determine that the distillation column to be processed needs to be pressurized when the difference is greater than zero. The third control unit is used to determine that the distillation column to be processed needs to be depressurized when the difference is less than zero.

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