阅读说明：本技术 在线酯化率分析仪 (On-line esterification rate analyzer ) 是由 张文佳 于 2018-06-19 设计创作，主要内容包括：本发明公开了一种在线酯化率分析仪,包括：检测器、控制盘和DCS控制系统,检测器安装于聚酯物料管道上、用于实时采集检测聚酯物料管道中的物料数据；检测器上设有485串口、通过该485串口将物料数据以MODBUS协议的形式发送至控制盘；控制盘中设有控制模算单元和存储单元；控制模算单元用于对检测数据进行实时运算分析、获得运算结果；存储单元用于对检测数据及控制模算单元所得运算结果进行存储；DCS控制系统与控制盘之间通过屏蔽电缆相连接,控制盘通过屏蔽电缆以4～20mA电流将运算结果发送至DCS控制系统。本发明结构简单,易于实现；能够减少人力成本、实现酯化率控制方案基于检测数据进行实时调整。(The invention discloses an on-line esterification rate analyzer, which comprises: the detector is arranged on the polyester material pipeline and used for collecting and detecting material data in the polyester material pipeline in real time; the detector is provided with a 485 serial port, and the material data is sent to the control panel in an MODBUS protocol form through the 485 serial port; the control panel is provided with a control calculation unit and a storage unit; the control calculation unit is used for carrying out real-time calculation analysis on the detection data and obtaining a calculation result; the storage unit is used for storing the detection data and the operation result obtained by the control operation unit; the DCS control system is connected with the control panel through a shielding cable, and the control panel sends the operation result to the DCS control system through the shielding cable at a current of 4-20 mA. The invention has simple structure and easy realization; the labor cost can be reduced, and the esterification rate control scheme can be adjusted in real time based on the detection data.)

1. An on-line esterification rate analyzer, characterized by comprising: the device comprises a detector (1), a control panel (2) and a DCS control system (3), wherein the detector (1) is installed on a polyester material pipeline and used for collecting and detecting material data in the polyester material pipeline in real time;

the detector (1) is provided with a 485 serial port, and the material data is sent to the control panel (2) in an MODBUS protocol form through the 485 serial port;

a control calculation unit and a storage unit are arranged in the control panel (2); the control calculation unit is used for carrying out real-time calculation analysis on the detection data and obtaining a calculation result; the storage unit is used for storing the detection data and the operation result obtained by the control operation unit;

DCS control system (3) is connected through shielded cable (4) between control panel (2), control panel (2) are through shielded cable (4) with 4 ~ 20mA electric current with the operation result send DCS control system (3).

2. The on-line esterification rate analyzer according to claim 1, wherein: the detector (1) is connected with the control panel (2) through a shielded cable (4); the detector (1) sends material data to the control panel (2) through the shielded cable (4) with 4-20 mA current.

3. The on-line esterification rate analyzer according to claim 1, wherein: the control panel (2) is also provided with an information interaction device which is used for accessing the storage unit and reading and displaying the detection data and the operation result stored in the storage unit.

4. The on-line esterification rate analyzer according to claim 2, wherein: the information interaction device is formed by adopting a touch screen.

Technical Field

The invention belongs to the technical field of petrochemical polyester industry, and particularly relates to an online esterification rate analyzer.

Background

In the petrochemical polyester industry, the content of terminal carboxyl groups (-COOH) is an important index for representing the quality of slices, and the quality of products and the direct economic benefit of enterprises are directly influenced by the content of the terminal carboxyl groups (-COOH). During the polymerization, the control of the esterification rate is the most important and direct means for ensuring the content of terminal carboxyl groups (-COOH) in the chips. In the conventional scheme, the esterification rate can only be obtained by sampling and analyzing by an examiner periodically, the analysis frequency is 1 time/shift (8 hours), the analysis time is more than 2 hours, and errors of analysis equipment, artificial factors, operation and sampling methods and the like exist. When the esterification rate data is abnormal, real data or analysis errors cannot be judged in time, the control scheme is adjusted according to the result through sampling analysis and cannot be in place at one time, the control fluctuation of the actual esterification rate is large, a large number of defective products can occur, and great loss is caused to a factory. In addition, the process of analytical testing requires personnel to be scheduled for regular shifts, which consumes a significant amount of labor cost. Therefore, how to develop a novel online esterification rate analyzer, which can acquire the detection data in real time and adjust the control scheme accordingly according to the detection data, and effectively reduce the labor cost is the direction that the skilled person needs to research.

Disclosure of Invention

The invention aims to provide an online esterification rate analyzer which can reduce the labor cost and realize real-time adjustment of an esterification rate control scheme based on detection data.

The specific technical scheme adopted is as follows:

an on-line esterification rate analyzer, comprising: the detector is arranged on the polyester material pipeline and used for collecting and detecting material data in the polyester material pipeline in real time; the detector is provided with a 485 serial port, and the material data is sent to the control panel in an MODBUS protocol form through the 485 serial port; the control panel is internally provided with a control calculation unit and a storage unit; the control calculation unit is used for carrying out real-time calculation analysis on the detection data and obtaining a calculation result; the storage unit is used for storing the detection data and the operation result obtained by the control operation unit; the DCS control system is connected with the control panel through a shielding cable, and the control panel sends the operation result to the DCS control system through the shielding cable at a current of 4-20 mA.

By adopting the technical scheme: the material data collected by the detector is output to the control panel in real time, a module unit in the control panel carries out real-time operation analysis according to the material data and feeds back an analysis result to the DCS control system, and the DCS control system correspondingly adjusts the esterification rate control scheme according to the fed-back analysis result, so that the real-time adjustment of the esterification rate control scheme is realized, the problems in the prior art are solved, and the working efficiency is greatly improved.

Preferably, in the above on-line esterification ratio analyzer: the detector is connected with the control panel through a shielded cable; the detector sends material data to the control panel through a shielded cable at a current of 4-20 mA.

By adopting the technical scheme: the shielded cable is used for transmitting signals and is taken as a precaution measure for communication faults, and the real-time performance and the effectiveness of data analysis and calculation are guaranteed.

More preferably, in the above on-line esterification ratio analyzer: the control panel is also provided with an information interaction device which is used for accessing the storage unit and reading and displaying the detection data and the operation result stored in the storage unit. Further preferred are: the information interaction device is formed by adopting a touch screen.

By adopting the technical scheme: engineers can inquire the historical data of the flow, the density, the temperature, the esterification rate value and the like of the materials on the touch screen at any time, and fine-tune calibration is carried out on the esterification rate value at any time according to judgment. And sending the calibrated parameters such as the esterification rate value, the flow of the materials and the like into a Distributed Control System (DCS) for an operator to monitor in a form of 4-20 mA current signals through a cable.

Compared with the prior art, the invention has simple structure and easy realization; the labor cost can be reduced, and the esterification rate control scheme can be adjusted in real time based on the detection data.

Drawings

The invention will be described in further detail with reference to the following detailed description and accompanying drawings:

FIG. 1 is a schematic structural view of example 1 of the present invention;

figure 2 is a process flow diagram implemented using the technical solution of example 1.

The correspondence between each reference numeral and the part name is as follows:

1. a detector; 2. a control panel; 3. a DCS control system; 4. a shielded cable.

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the following will be further described with reference to various embodiments.

FIG. 1 shows example 1 of the present invention:

an on-line esterification rate analyzer, comprising: the device comprises a detector 1, a control panel 2 and a DCS control system 3, wherein the detector 1 is arranged on a polyester material pipeline and is used for collecting and detecting material data in the polyester material pipeline in real time; the detector 1 is provided with a 485 serial port, and the material data is sent to the control panel 2 in an MODBUS protocol form through the 485 serial port; the control panel 2 is internally provided with a control calculation unit and a storage unit; the control calculation unit is used for carrying out real-time calculation analysis on the detection data and obtaining a calculation result; the storage unit is used for storing the detection data and the operation result obtained by the control operation unit; the DCS control system 3 is connected with the control panel 2 through a shielding cable 4, and the control panel 2 sends an operation result to the DCS control system 3 through the shielding cable 4 at a current of 4-20 mA.

In order to prevent communication faults, a shielding cable 4 is also arranged between the detector 1 and the control panel 2 and is connected with each other; the detector 1 sends material data to the control panel 2 through the shielded cable 4 at a current of 4-20 mA. And the control panel 2 is also provided with an information interaction device which is used for accessing the storage unit and reading and displaying the detection data and the operation result stored in the storage unit. The information interaction device can be formed by adopting a touch screen. Other devices having the same function may be selected.

The working process is as follows:

firstly, an industry expert sums up the standard value of the esterification rate of the current material according to the types of polyester materials and products according to industry experience for many years. After the analyzer control calculation unit receives signals of flow, temperature, density and the like of materials, a primary online esterification rate real-time value is obtained by combining standard values provided by experts in the polyester industry and calculating through a formula of a series of empirical models: (t, P, ρ, L, F) + standard value model calculation + empirical coefficient = real-time value of online esterification rate. After the real-time value of the on-line esterification rate is obtained through calculation, the final value of the esterification rate is obtained through processing such as filtering, fine tuning and calibration, and the like, and the final value is output to a touch screen of a module calculation unit and an item distributed control system for monitoring by an engineer. In practice, the working conditions of the polyester materials are different according to the difference of the field production process. Therefore, by adopting the scheme, according to the investigation condition of the production process, a standard value corresponding to the material and the working condition is provided by combining with the industry experience. The product integrates the standard value into a calculation formula of the esterification rate, so that the calculation error of the esterification rate is effectively reduced, and the calculation result is customized for the actual polyester material of a factory.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The protection scope of the present invention is subject to the protection scope of the claims.