CN219441597U

CN219441597U - Control device for producing polypropylene

Info

Publication number: CN219441597U
Application number: CN202320661198.2U
Authority: CN
Inventors: 张聪; 胡楠; 李振涛; 黄汝庆
Original assignee: Shandong High End Chemical Research Institute Co ltd
Current assignee: Shandong High End Chemical Research Institute Co ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-08-01
Anticipated expiration: 2033-03-30

Abstract

The utility model relates to the technical field of polypropylene production, in particular to a control device for producing polypropylene. The utility model provides a controlling means for producing polypropylene, includes reation kettle, still includes controller, governing valve, the controller with the governing valve electricity is connected, is used for control the repeated cycle of governing valve switching degree, the governing valve install in on reation kettle's the pipeline of discharge gate, be used for control reation kettle's unloading volume realizes the automation, the intelligent control that polypropylene zero release was driven, reduces staff's working strength and avoids staff's operation risk.

Description

Control device for producing polypropylene

Technical Field

The utility model relates to the technical field of polypropylene production, in particular to a control device for producing polypropylene.

Background

Polypropylene is a thermoplastic resin prepared by propylene polymerization, is one of the main universal plastic products in the world, and has the advantages of rich raw material sources, balanced mechanical properties, excellent impact resistance, heat resistance, corrosion resistance and the like.

However, at present, the zero-emission start of the domestic polypropylene production device is realized by manually and continuously switching the blanking valve, commonly called as a valve shaking valve, and the operation needs to be performed by a special person on and off three control valves of the polypropylene production device before a computer is operated, so that the labor force is not liberated, and the operation error is easy to cause and the pipeline is blocked.

Accordingly, there is a need to provide a control device for producing polypropylene to solve the above problems.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems existing in the prior art and provides a control device for producing polypropylene.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a controlling means for producing polypropylene, includes reation kettle, still includes controller, governing valve, the controller with the governing valve electricity is connected for control the recirculation of governing valve switching degree, the governing valve install in on the pipeline of reation kettle's discharge gate, be used for control reation kettle's unloading volume.

Further, the regulating valve is a pneumatic V-shaped ball regulating valve.

Further, the reaction kettle comprises a high-pressure degassing filter, a low-pressure degassing filter, a steamer and a dryer, wherein the high-pressure degassing filter is communicated with the low-pressure degassing filter; the low-pressure degassing filter is communicated with the steamer; the steamer is in communication with the dryer.

Further, the high pressure degasser filter and the low pressure degasser filter are arranged side by side.

Further, the steamer and the dryer are arranged in parallel.

Further, the regulating valve comprises a first regulating valve, a second regulating valve and a third regulating valve, and the first regulating valve is arranged between the high-pressure degassing filter and the low-pressure degassing filter; the second regulating valve is arranged between the low-pressure degassing filter and the steamer; the third regulating valve is arranged between the steamer and the dryer.

Further, the reaction kettle also comprises an annular reactor, wherein the annular reactor is communicated with the high-pressure degassing filter through a flash evaporation line, and a steam jacket is arranged outside the flash evaporation line.

Further, the steamer is a vertical cylindrical container, and a low-speed stirrer is arranged in the container.

Further, the dryer is a vertical tank.

Further, the top of the high-pressure degassing filter and/or the low-pressure degassing filter is connected with a propylene washing and recovering device; the steaming device is connected with a steaming tail gas recoverer; and the dryer is connected with a drying washer.

The utility model has the beneficial effects that: compared with the prior art, the control device for producing polypropylene comprises a reaction kettle, a controller and a regulating valve, wherein the controller is electrically connected with the regulating valve and is used for controlling the repeated circulation of the switching degree of the regulating valve, and the regulating valve is arranged on a pipeline of a discharge hole of the reaction kettle and is used for controlling the discharging amount of the reaction kettle, so that the automatic and intelligent control of the zero-discharge start of polypropylene is realized, the working strength of workers is reduced, and the operation risk of the workers is avoided.

Drawings

Fig. 1 is a schematic structural view of a control apparatus for producing polypropylene according to a preferred embodiment of the present utility model.

Reference numerals: 1. a ring reactor; 2. a regulating valve; 201. a first regulating valve; 202. a second regulating valve; 203. a third regulating valve; 3. a high pressure degasification filter; 4. a low pressure degasification filter; 5. a steamer; 6. a dryer; 7. a propylene washing and recovering device; 8. a vapor tail gas recoverer; 9. and (5) drying the washer.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, the control device for producing polypropylene according to the preferred embodiment of the utility model comprises a reaction kettle, a controller and a regulating valve 2, wherein the controller is electrically connected with the regulating valve 2 and is used for controlling the repeated circulation of the switching degree of the regulating valve 2, and the regulating valve 2 is arranged on a pipeline of a discharge port of the reaction kettle and is used for controlling the discharging amount of the reaction kettle, so that the automatic and intelligent control of the zero-discharge start of polypropylene is realized, the working strength of workers is reduced, and the operation risk of the workers is avoided.

As a preferred embodiment of the utility model, it may also have the following additional technical features: the regulating valve is a pneumatic V-shaped ball regulating valve.

The valve core of the pneumatic V-shaped adjusting ball valve is designed into a V-shaped notch with a special switch, the V-shaped notch and a valve seat generate a strong shearing force, high-viscosity media containing fibers or tiny solid particles and the like can be cut off, the valve core has a self-cleaning function, and the phenomenon of valve blocking is avoided. The pneumatic V-shaped ball valve is suitable for adjusting and controlling, has high stability, and can ensure the accuracy of control in the whole range even under the condition of small flow or high viscosity medium.

Meanwhile, the ball body of the pneumatic V-shaped adjusting ball valve is provided with a V-shaped opening, the opening area is changed along with the rotation of the ball, but the shape of the opening surface is always kept to be triangle, the flow characteristic is approximate to the same percentage, the adjustable ratio is large, the pressure loss is small, the flow capacity is large, the precise intercepting characteristic and the control function are realized, the opening and closing part adopts a V-shaped spherical segment structure, the problem that a valve cavity is easy to deposit medium is completely solved, and the pneumatic V-shaped adjusting ball valve is suitable for fibrous and pasty fluid.

In the embodiment, the reaction kettle comprises a high-pressure degassing filter 3, a low-pressure degassing filter 4, a steamer 5 and a dryer 6, wherein the high-pressure degassing filter 3 is communicated with the low-pressure degassing filter 4; the low-pressure degassing filter 4 is communicated with the steamer 5, and the steamer 5 is communicated with the dryer 6. The high-pressure degassing filter 3 and the low-pressure degassing filter 4 are arranged side by side; the steamer 5 and the dryer 6 are arranged in parallel.

In this embodiment, the regulating valve 2 includes a first regulating valve 201, a second regulating valve 202, and a third regulating valve 203, where the first regulating valve 201 is installed between the high-pressure degassing filter 3 and the low-pressure degassing filter 4; the second regulating valve 202 is arranged between the low-pressure degassing filter 4 and the steamer 5; the third regulating valve 203 is installed between the steamer 5 and the dryer 6.

The switching degree of the regulating valve is regulated by the controller, wherein Z and Y represent Y seconds of switching every Z seconds, X1 represents the opening degree, X2 represents the closing degree (0% < X1, X2 < 100%), the switching of the valve is instantaneously completed, one cycle needs Z+Y seconds, namely every Z seconds, the valve is switched to X1, and after Y seconds, the valve is switched to X2, and the cycle is repeated; the applet can be switched manually and automatically.

The specific operation is as follows:

(1) And when the main catalyst is thrown, the valve shaking operation is started, and the valve shaking operation is started from the high-pressure degassing filter, the low-pressure degassing filter, the steamer and the dryer in sequence.

(2) When the density of the ring pipe is lower than 440kg/m < 3 >, the blanking valve of the high-pressure degassing filter is opened for 3 seconds at intervals of 20 seconds, and the valve position opening is 5% -30%; the blanking valve of the low-pressure degassing filter is opened for 3 seconds at intervals of 30 seconds, and the valve position opening is 0-30%; the blanking valve of the steamer is opened for 3 seconds at intervals of 30 seconds, and the valve position opening is 0-30%; the blanking valve of the dryer is opened for 3 seconds at intervals of 30 seconds, and the valve position opening is 0-30%.

(3) When the density of the ring pipe is 440-460kg/m3, the blanking valve of the high-pressure degassing filter is opened for 8 seconds at intervals of 10 seconds, and the valve position opening is 10% -60%; the blanking valve of the low-pressure degassing filter is opened for 8 seconds at intervals of 10 seconds, and the valve position opening is 10-50%; the blanking valve of the steamer is opened for 8 seconds at 15 seconds intervals, and the valve position opening is 5-50%; the steaming device blanking valve is opened for 8 seconds at intervals of 10 seconds, and the valve position opening is 5-50%.

(4) When the density of the ring pipe is 460-480kg/m < 3 >, the blanking valve of the high-pressure degassing filter is opened for 10 seconds at intervals of 5 seconds, and the valve position opening is 20-60%; the blanking valve of the low-pressure degassing filter is opened for 10 seconds at intervals of 5 seconds, and the valve position opening is 15-50%; the steaming device blanking valve is opened for 10 seconds at intervals of 10 seconds, and the valve position opening is 10-50%; the steaming device blanking valve is opened for 10 seconds at intervals of 10 seconds, and the valve position opening is 10-50%.

(5) When valve shaking begins, an external operation site is arranged to check whether the valve position is switched in place or not, and the valve position is consistent with the indoor position. And once the suspected valve blocking phenomenon of the blanking valve occurs, the manual operation is immediately changed, and the opening degree of the valve is increased to prolong the valve opening time.

In this embodiment, the reaction kettle further comprises an annular reactor 1, wherein the annular reactor is communicated with the high-pressure degassing filter through a flash evaporation line, and a steam jacket is arranged outside the flash evaporation line. Namely, propylene reacts in a loop reactor under the action of a catalyst, hydrogen is used for adjusting the molecular weight of the polymer, and the slurry density reaches 480-565 kg/m at the reaction temperature of 70 DEG C ³ The reactor operated well when it contained about 50 to 55 weight percent polymer, the slurry density was less than 480kg/m ³ When the polymer is sticky, the feeding hole is easy to block, and the feeding valve needs to be frequently opened and closed to avoid blocking. The slurry from the reactor was discharged to a high pressure degassing filter through a flash line, where propylene was vaporized as the pressure was reduced from 3.4 to 4.5MPa to about 1.8 MPa.

In order to ensure complete vaporization and overheating of propylene, a steam jacket is arranged outside the flash line, and the pressure of steam fed into the jacket is set in cascade through a temperature controller. The method can adjust the flash capacity according to the load of the device, and keep the wall temperature as low as possible. And the flash line diameter is gradually increased to accommodate the volumetric expansion of propylene and limit its flow rate. The polymer containing a small amount of propylene monomer from the high pressure degassing filter enters the low pressure degassing filter, the polymer and the monomer are further separated in the low pressure degassing filter, the polymer enters the steamer from the low pressure degassing filter under the control of the level gauge, and the propylene gas is discharged from the top of the bag filter, passes through the safety filter and then enters the low pressure propylene washing and recycling device 7.

In this embodiment, the steamer 5 is a vertical cylindrical container, a low-speed stirrer is arranged in the container, and meanwhile, the steamer 5 is connected with a gas-steam tail gas recoverer 8, which is used for ensuring that the polymer passes through in a plug flow mode, steam enters from the bottom of the steamer 5 through a special sieve plate and an annular distributor positioned at the upper part of the steamer 5, and the polymer is discharged under the control of the material level by virtue of gravity. Two low pressure vapors introduced at the bottom of the steamer 5 are used to deactivate residual catalyst and TEAL and remove residual hydrocarbons.

In this embodiment, the dryer 6 is a vertical tank, and a dryer washer 9 is connected to the dryer. I.e. the drying of the polymer is accomplished in a dryer. The hot nitrogen under flow control is blown upwards from a porous distribution plate at the bottom of the dryer, and by controlling the flow rate of the gas (the gas flow rate is kept between the critical fluidization speed and the carry-out speed of the particles), the wet polypropylene powder forms a fluidized bed layer in the dryer, and the water in the polymer is taken away by the hot nitrogen through the heat transfer effect of the hot nitrogen and the polymer. The dried polymer powder falls from the left side of the separator, flows clockwise under the action of hot nitrogen flow, and enters the notch for discharging. Thus, the material is prevented from being discharged in a short circuit, the polymer is ensured to be uniformly dried, and no wet polymer is discharged. And the dried polymer powder is discharged through a material level control valve at the bottom of the dryer.

In order to realize intelligent operation instead of manual operation, the pneumatic V-shaped ball regulating valve is selected on the regulating valve, and special requirements are provided for the design of the regulating valve, such as: the control system is designed according to the change of the regulating valve, the controlled valve is periodically switched to the required opening according to the program setting, the valve opening and closing are instantly completed, one cycle needs Z+Y seconds, namely every Z seconds, the valve is opened to X1, and after Y seconds, the valve is closed to X2, and the cycle is repeated; and the control device can realize manual and automatic switching.

The above additional technical features can be freely combined and superimposed by a person skilled in the art without conflict.

It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. A controlling means for producing polypropylene, includes reation kettle, its characterized in that: the automatic feeding device is characterized by further comprising a controller and a regulating valve, wherein the controller is electrically connected with the regulating valve and used for controlling the repeated circulation of the switching degree of the regulating valve, and the regulating valve is arranged on a pipeline of a discharge port of the reaction kettle and used for controlling the discharging quantity of the reaction kettle.

2. The control device for producing polypropylene according to claim 1, wherein: the regulating valve is a pneumatic V-shaped ball regulating valve.

3. The control device for producing polypropylene according to claim 1, wherein: the reaction kettle comprises a high-pressure degassing filter, a low-pressure degassing filter, a steamer and a dryer, wherein the high-pressure degassing filter is communicated with the low-pressure degassing filter; the low-pressure degassing filter is communicated with the steamer; the steamer is in communication with the dryer.

4. A control device for producing polypropylene according to claim 3, wherein: the high-pressure degassing filter and the low-pressure degassing filter are arranged side by side.

5. A control device for producing polypropylene according to claim 3, wherein: the steamer and the dryer are arranged in parallel.

6. A control device for producing polypropylene according to claim 3, wherein: the regulating valve comprises a first regulating valve, a second regulating valve and a third regulating valve, and the first regulating valve is arranged between the high-pressure degassing filter and the low-pressure degassing filter; the second regulating valve is arranged between the low-pressure degassing filter and the steamer; the third regulating valve is arranged between the steamer and the dryer.

7. A control device for producing polypropylene according to claim 3, wherein: the reaction kettle further comprises an annular reactor, the annular reactor is communicated with the high-pressure degassing filter through a flash evaporation line, and a steam jacket is arranged outside the flash evaporation line.

8. A control device for producing polypropylene according to claim 3, wherein: the steamer is a vertical cylindrical container, and a low-speed stirrer is arranged in the container.

9. A control device for producing polypropylene according to claim 3, wherein: the dryer is a vertical tank.

10. A control device for producing polypropylene according to claim 3, wherein: the top of the high-pressure degassing filter and/or the low-pressure degassing filter is connected with a propylene washing and recycling device; the steaming device is connected with a steaming tail gas recoverer; and the dryer is connected with a drying washer.