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Automatic control method for hydrogen supplementing of intermittent polypropylene device based on soft measurement

An automatic control and polypropylene technology, which is applied in the direction of chemical instruments and methods, feeding devices, control/regulation processes, etc., can solve the problem that the amount of hydrogen cannot be controlled, and achieve the reduction of human experience factors, stable polypropylene products, The effect of precise production

Active Publication Date: 2019-01-15
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] CN 201495193 proposes a method of feeding with a metering tank with a certain volume, and realizes the measurable amount of hydrogen addition through DCS. However, since the amount of propylene recovered at high pressure in each kettle is different, this method still cannot guarantee that the amount of hydrogen added to each kettle can be measured. control

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  • Automatic control method for hydrogen supplementing of intermittent polypropylene device based on soft measurement

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Embodiment Construction

[0013] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0014] The automatic control method of hydrogen feeding in batch polypropylene plant based on soft measurement, the steps are as follows:

[0015] Such as figure 1 As shown, the hydrogen feeding automatic control system of the intermittent polypropylene plant includes a high-pressure recovery propylene storage tank 1, a hydrogen storage tank 2, a reaction kettle 3, a high-pressure recovery propylene condenser 4, a hydrogenation switch valve 5, and a high-pressure recovery propylene storage tank temperature Detector 6, pressure detector 7, flow detector 8, high-pressure recovery propylene feed pump 9, programmable controller 10.

[0016] On the basis of the intermittent polypropylene device, it is necessary to add a temperature detector 6 in the high-pressure recovery propylene storage tank 1. The temperatu...

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Abstract

The invention belongs to the technical field of petrochemical engineering, and provides an automatic control method for hydrogen supplementing of an intermittent polypropylene device based on soft measurement. A programmable controller is used for calculating a hydrogen dissolution amount according to temperature and pressure of a high pressure propylene storage tank, the responded dissolution concentration in the tank according to built-in hydrogen-propylene phase balance data, and the total flow of high-pressure recovered propylene into a next kettle, finally, the amount of fresh hydrogen needed to be supplemented is calculated according to the required amount of hydrogen, and the corresponding amount of hydrogen is automatically supplemented. According to the method, human experience factors in operation can be reduced, produced polypropylene products are more stable, and the polypropylene products with the corresponding grades can be produced more accurately.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to a method for automating the feeding of new hydrogen by means of phase balance data and a programmable controller. Specifically, it is based on phase balance models, real-time temperature and pressure measurements, and calculates the dissolved hydrogen in high-pressure recovered propylene. Hydrogen concentration, realize the soft measurement of dissolved hydrogen in high-pressure recovery propylene, and then add fresh hydrogen according to the hydrogen required by the product brand, and improve the stability of batch products. Background technique [0002] Polypropylene is an important chemical and petrochemical product, and its market demand is increasing year by year. Polypropylene is mainly made into various plastics, mainly the basic raw material for retail, pharmaceutical packaging, beverage, food packaging, household containers, etc. Due to the chemical stabili...

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Application Information

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IPC IPC(8): B01J19/00B01J4/00C08F110/06C08F2/01
CPCB01J4/008B01J19/0006B01J19/0013B01J2219/00162B01J2219/00195C08F110/06C08F2/01
Inventor 张凤岐黄舜尧王倩韩志忠李民邹雄栾波董宏光
Owner DALIAN UNIV OF TECH
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