WO2021098071A1 - 一种浆料调配的温度控制装置及方法 - Google Patents

一种浆料调配的温度控制装置及方法 Download PDF

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WO2021098071A1
WO2021098071A1 PCT/CN2020/076389 CN2020076389W WO2021098071A1 WO 2021098071 A1 WO2021098071 A1 WO 2021098071A1 CN 2020076389 W CN2020076389 W CN 2020076389W WO 2021098071 A1 WO2021098071 A1 WO 2021098071A1
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temperature
pta
tank
slurry
heat exchanger
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PCT/CN2020/076389
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French (fr)
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陈士良
许金祥
钱国华
钟云杰
张月平
孙燕琳
肖顺立
沈渭泉
吕垚峰
沈忠惠
林雪燕
刘艳丽
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桐昆集团浙江恒通化纤有限公司
桐昆集团股份有限公司
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Publication of WO2021098071A1 publication Critical patent/WO2021098071A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2115—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2215—Temperature
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor

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  • the invention relates to the field of polyester production, and specifically refers to a temperature control device and method for slurry preparation in the polyester production process.
  • PET polyester
  • PTA terephthalic acid
  • EG ethylene glycol
  • PTA temperature is a constantly changing process.
  • the temperature of the PTA put into the PTA silo is different due to the influence of different PTA batches, different ambient temperatures and other factors.
  • the EG stored in the storage tank will also change according to the environmental impact and temperature of the site. When the slurry is blended, PTA and EG at different temperatures will directly affect the slurry temperature when entering the blending tank, causing its temperature to fluctuate.
  • the technical problem to be solved by the present invention is to provide a temperature control device and method for slurry preparation, which calculates based on the temperature and quality of the two raw materials, and then controls, and finally achieves the effect of stabilizing the slurry temperature.
  • the technical solution of the present invention is to provide a device for temperature control of slurry preparation, including an EG storage tank, a preparation tank, a PTA silo, and a DCS controller.
  • the PTA silo is located above the preparation tank, and the bottom of the PTA silo is provided
  • the discharging tube is equipped with a discharging rotary valve and a thermometer for monitoring the PTA temperature.
  • the EG storage tank and the distributing tank are The outlet of the EG storage tank is connected to the inlet end of the heat exchanger through the EG inlet pipeline, and the outlet end of the heat exchanger is connected to the deployment tank through the EG outlet pipeline.
  • the medium inlet and outlet of the heat exchanger are respectively connected to the cooling water inlet.
  • the cooling water outlet pipe and the cooling water inlet pipe are equipped with a regulating valve.
  • the EG outlet pipeline is equipped with a thermometer for monitoring the EG temperature.
  • the thermometers for detecting the PTA temperature and the EG temperature are electrically connected to the DCS controller.
  • the DCS controller It is also electrically connected to the regulating valve.
  • the thermometer can be a resistance thermometer, and the heat exchanger can be a plate heat exchanger.
  • the regulating valve may be a pneumatic regulating valve or a solenoid valve.
  • Two discharge ports are set at the bottom of the PTA silo.
  • the present invention also provides a temperature control method for slurry preparation.
  • a plate heat exchanger is installed on the pipeline from the EG storage tank to the preparation tank, and a pneumatic regulating valve and a plate heat exchanger are installed on the heat exchange medium pipeline of the plate heat exchanger.
  • the EG outlet pipeline is equipped with resistance thermometers, and the two PTA discharge ports of the PTA silo are respectively installed with resistance thermometers;
  • the PTA temperature and EG temperature monitored by the thermometer at the feeding port are sent to the DCS controller respectively.
  • the calculation module of the DCS controller calculates that it enters the blending tank PTA temperature;
  • the PTA temperature includes the first PTA temperature of the first discharging port and the second PTA temperature of the second discharging port.
  • the present invention has the following advantages: it cannot be controlled based on the PTA temperature, so the slurry temperature is controlled by controlling the EG temperature, and finally the stable slurry temperature is stabilized, by setting a thermometer, The pneumatic control valve is calculated and controlled by the DCS controller, and the EG temperature is controlled by adjusting the opening of the pneumatic control valve. This process enables the pneumatic control valve to be controlled according to the temperature changes of PTA and EG. Because PID calculation is an automatic closed-loop control, the final slurry temperature tends to the set value, and the temperature fluctuation is very small.
  • Figure 1 is a schematic diagram of the device structure of the present invention.
  • Figure 2 is a schematic diagram of the calculation process of the DSC controller.
  • a slurry preparation temperature control method As shown in Figure 1, a plate heat exchanger 5 is installed on the pipeline from the EG storage tank 1 to the preparation tank 2, and a pneumatic control valve is installed on the heat exchange medium pipeline of the plate heat exchanger 5 6.
  • the resistance thermometer 4 is installed in the EG outlet pipeline 12 of the plate heat exchanger 5, and the resistance thermometer 4 is installed in the two PTA discharge ports of the PTA silo 3 respectively;
  • slurry temperature PV value [(calculated PTA temperature ⁇ PTA mass ⁇ PTA specific heat)+(EG temperature ⁇ EG mass ⁇ EG specific heat)]/[(EG mass +PTA mass) ⁇ specific heat of the mixture of EG and PTA].
  • the device for temperature control of slurry preparation includes an EG storage tank 1, a preparation tank 2, and a PTA silo 3.
  • the PTA silo 3 is located above the preparation tank 2, and the bottom of the PTA silo 3 is provided with two discharge ports.
  • the two discharging ports are respectively connected to the mixing tank 2 through a discharging pipe 31.
  • the discharging tube 31 is provided with a discharging rotary valve 32 and a resistance thermometer 4 for PTA temperature monitoring.
  • One of the EG storage tank 1 and the distributing tank 2 There is a plate heat exchanger 5 in between.
  • the inlet end of the plate heat exchanger 5 and the outlet of the EG storage tank 1 are connected through the EG inlet pipeline 11, and the outlet end of the plate heat exchanger 5 is connected with the deployment tank 2 through the EG outlet pipeline 12.
  • the plate heat exchange The medium inlet and the medium outlet of the device 5 are respectively connected to the cooling water inlet pipe 51 and the cooling water outlet pipe 52.
  • the cooling water inlet pipe 51 is provided with a pneumatic regulating valve 6, and the EG outlet pipeline 12 is provided with a resistance thermometer 4 for EG temperature monitoring.
  • the resistance thermometer 4 for PTA temperature monitoring and the resistance thermometer 4 for EG temperature monitoring are respectively electrically connected to the DCS controller, and the DCS controller is also electrically connected to the pneumatic regulating valve 6.
  • the electrical signal collected by the resistance thermometer is fed back to the DCS controller, and calculated by the calculation module that comes with the DCS controller, and the opening of the pneumatic regulating valve is adjusted according to the calculation result, so as to realize the slurry temperature by controlling the EG temperature control.
  • the present invention is based on the PTA temperature that cannot be controlled, so the slurry temperature is controlled by controlling the EG temperature, and finally stabilizes the slurry temperature. It is performed by setting a thermometer, a pneumatic regulating valve, and using a DCS controller. Calculation and control. Control the EG temperature by adjusting the opening of the pneumatic control valve. This process enables the pneumatic control valve to be controlled according to the temperature changes of PTA and EG. Because PID operation is an automatic closed-loop control. Therefore, the final slurry temperature tends to the set value, and the temperature fluctuation is very small.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Accessories For Mixers (AREA)

Abstract

一种浆料调配的温度控制装置及方法。温度控制装置包括EG储罐（1）、调配罐（2）、PTA料仓（3）、DCS控制器。在EG储罐（1）输往调配罐（2）的管线上安装板式换热器（5），板式换热器（5）的换热介质进口管线（51）上安装气动调节阀（6），与调配罐（2）连接的EG出口管线（12）上安装电阻式温度计（4），PTA料仓（3）的两个PTA下料口分别安装电阻式温度计（4）。浆料调配温度控制方法根据两种原料的温度进行计算，然后根据计算结果来调节气动调节阀（6）的开度，最终达到稳定的浆料温度。

Description

一种浆料调配的温度控制装置及方法 技术领域：
本发明涉及聚酯生产领域，具体来讲就是指聚酯生产过程中浆料调配的温度控制装置及方法。
背景技术：
聚酯(PET)加工生产使用的主原料为精对苯二甲酸(PTA)与乙二醇(EG)，是按照工艺要求调配成浆料经化学反应后制得，但浆料调配的好与差直接影响浆料在反应釜中的反应，最终影响产品质量，而衡量浆料调配好与差的重要标准之一就是浆料温度的控制。
PTA运输过程中和存放过程中，PTA温度是一个不断变化的过程。不同PTA批次、不同的环境温度及其他因素的影响，投入到PTA料仓中的PTA温度存在差异性。存放在储罐中的EG，也是会根据现场环境影响，温度进行变化。当浆料调配时，不同温度的PTA和EG进入到调配罐时，会直接影响浆料温度，使其温度波动变化。
发明内容：
本发明所要解决的技术问题是，提供一种浆料调配的温度控制装置及方法，其根据两种原料的温度和质量进行计算，然后进行控制，最终达到稳定浆料温度的效果。
本发明的技术解决方案是，提供一种用于浆料调配温度控制的装置，包括EG储罐、调配罐、PTA料仓、DCS控制器，PTA料仓位于调配罐上方，PTA料仓底部设有一个或多个下料口，每个下料口分别通过下料管与调配罐连接，下料管上设有下料回转阀和用于监测PTA温度的温度计，EG储罐与调配罐之间设有换热器，EG储罐出口通过EG进口管线连接换热器的入口端，换热器出口端通过EG出口管线与调配罐连接，换热器介质进口和介质出口分别连接冷却水进管和冷却水出管，冷却水进管上设有调节阀，EG出口管线设有用于监测EG温度的温度计，用于检测PTA温度和EG温度的温度计均与DCS控制器电连接，DCS控制器还与调节阀电连接。其中温度计可以为电阻式温度计，其换热器可以为板式换热器。所述调节阀可以为气动调节阀或者电磁阀。
PTA料仓底部设置两个下料口。
本发明还提供一种浆料调配的温度控制方法，首先，在EG储罐输往调配罐管线上安装板式换热器，板式换热器换热介质管线上安装气动调节阀，板式换热器EG出口管线安装电阻式温度计，PTA料仓的两个PTA下料口分别安装电阻式温度计；
然后，将温度计监测到下料口的PTA温度和EG温度分别送入到DCS控制器，根据PTA温度及对应温度的PTA进入调配罐的量，通过DCS控制器的计算模块计算出进入调配罐中的PTA温度；
接着，根据计算出来的PTA温度与EG温度以及进入调配罐的PTA与EG的量进行计算，计算出PTA和EG混合后的温度，作为PID调节运算的PV值(实测值)；并根据工艺要求，确定浆料所需要的温度，作为PID调节运算的SP值(设定值)；当设定SP值(设定值)后，通过PID运算，计算出EG所需的实际温度，然后输出OP值(输出值，给调节阀的信号值)来调节调节阀的开度，控制EG温度来实现浆料温度的控制。
作为优选，PTA温度包括第一下料口的第一PTA温度和第二下料口的第二PTA温度。
采用以上方案后与现有技术相比，本发明具有以下优点：基于PTA温度无法对其控制，所以以控制EG温度来进行浆料温度的控制，最终达到稳定浆料温度稳定，通过设置温度计、气动调节阀，并利用DCS控制器进行计算和控制，通过调节气动调节阀的开度来控制EG温度，这一个过程，使气动调节阀根据PTA与EG温度变化进行控制。因PID运算是一个自动闭环控制，所以最终浆料温度，趋向于设定值，且温度波动非常小。
附图说明：
图1为本发明的装置结构示意图。
图2为DSC控制器计算流程示意图。
具体实施方式：
下面就具体实施方式对本发明作进一步说明：
实施例1
一种浆料调配温度控制方法，首先，如图1所示，在EG储罐1输往调配罐 2管线上安装板式换热器5，板式换热器5换热介质管线上安装气动调节阀6，板式换热器5的EG出口管线12安装电阻式温度计4，PTA料仓3的两个PTA下料口分别安装电阻式温度计4；
然后，将经由电阻式温度计4监测的两个下料口的PTA温度和EG温度送入到DCS控制器，根据两个PTA温度，通过计算模块(如图2)计算出进入调配罐中的PTA温度；需要根据计公式：PTA温度＝[(PTA温度1×PTA质量1×PTA比热)+(PTA温度2×PTA质量2×PTA比热)]/[(PTA质量1×PTA比热+PTA质量2×PTA比热)。
接着，根据计算出来的PTA温度与EG温度以及进入调配罐的PTA与EG的量进行计算，计算出PTA和EG混合后的温度，作为PID调节运算的PV值(实测值)；并根据工艺要求，确定浆料所需要的温度，作为PID调节运算的SP值(设定值)；当设定SP值(设定值)后，通过PID运算，计算出EG所需的实际温度，然后输出OP值(输出值，给调节阀的信号值)来调节调节阀的开度，控制EG温度来实现浆料温度的控制。PTA、EG混合后的温度计算公式：浆料温度PV值＝[(计算得出的PTA温度×PTA质量×PTA比热)+(EG温度×EG质量×EG比热)]/[(EG质量+PTA质量)×EG与PTA混合物的比热]。
具体的，用于浆料调配温度控制的装置包括EG储罐1、调配罐2、PTA料仓3，PTA料仓3位于调配罐2上方，PTA料仓3底部设有两个下料口，两个下料口分别通过下料管31与调配罐2连接，下料管31上设有下料回转阀32和用于PTA温度监测的电阻式温度计4，EG储罐1与调配罐2之间设有板式换热器5，板式换热器5入口端与EG储罐1出口通过EG进口管线11连接，板式换热器5出口端与调配罐2通过EG出口管线12连接，板式换热器5介质进口和介质出口分别连接冷却水进管51和冷却水出管52，冷却水进管51上设有气动调节阀6，EG出口管线12设有用于EG温度监测的电阻式温度计4，用于PTA温度监测的电阻式温度计4和用于EG温度监测的电阻式温度计4分别与DCS控制器电连接，DCS控制器还与气动调节阀6电连接。将电阻式温度计采集的电信号反馈给DCS控制器，并通过DCS控制器自带的计算模块进行计算，根据计算结果来调节气动调节阀的开度，从而通过控制EG温度来实现浆料温度的控制。
综上所述，本发明基于PTA温度无法对其控制，所以以控制EG温度来进行浆料温度的控制，最终达到稳定浆料温度稳定，通过设置温度计、气动调节阀，并利用DCS控制器进行计算和控制，通过调节气动调节阀的开度来控制EG温度，这一个过程，使气动调节阀根据PTA与EG温度变化进行控制。因PID运算是一个自动闭环控制。所以最终浆料温度，趋向于设定值，且温度波动非常小。
以上仅就本发明较佳的实施例作了说明，但不能理解为是对权利要求的限制。凡是利用本发明说明书所做的等效结构或等效流程变换，均包括在本发明的专利保护范围之内。

Claims (4)

  1. 一种浆料调配的温度控制装置，包括EG储罐、调配罐、PTA料仓、DCS控制器，PTA料仓位于调配罐上方，其特征在于：PTA料仓底部设有一个或多个下料口，每个下料口分别通过下料管与调配罐连接，下料管上设有下料回转阀和用于监测PTA温度的温度计，EG储罐与调配罐之间设有换热器，EG储罐出口通过EG进口管线连接换热器的入口端，换热器出口端通过EG出口管线与调配罐连接，换热器介质进口和介质出口分别连接冷却水进管和冷却水出管，冷却水进管上设有调节阀，EG出口管线设有用于监测EG温度的温度计，用于检测PTA温度和EG温度的温度计均与DCS控制器电连接，DCS控制器还与调节阀电连接。
  2. 根据权利要求1所述的一种浆料调配的温度控制装置，其特征是：所述温度计均为电阻式温度计。
  3. 根据权利要求2所述的一种浆料调配的温度控制方法，其特征在于：PTA料仓底部设置两个下料口。
  4. 一种使用如权利要求1所述装置的浆料调配的温度控制方法，其特征在于：首先，在EG储罐输往调配罐管线上安装换热器，换热器换热介质管线上安装调节阀，换热器EG出口管线安装温度计，PTA料仓的下料口安装温度计；
    然后，将温度计监测到下料口的PTA温度和EG温度分别送入到DCS控制器，根据PTA温度及对应温度的PTA进入调配罐的量，通过DCS控制器的计算模块计算出进入调配罐中的PTA温度；
    接着，根据计算出来的PTA温度与EG温度以及进入调配罐的PTA与EG的量进行计算，计算出PTA和EG混合后的温度，作为PID调节运算的PV值；并根据工艺要求，确定浆料所需要的温度，作为PID调节运算的SP值；当设定SP值后，通过PID运算，计算出EG所需的实际温度，然后输出OP值来调节调节阀的开度，控制EG温度来实现浆料温度的控制。
PCT/CN2020/076389 2019-11-22 2020-02-24 一种浆料调配的温度控制装置及方法 WO2021098071A1 (zh)

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