CN219849508U - Device for precisely controlling polymerization reaction gas-phase initiator - Google Patents

Abstract

The utility model provides a device for precisely controlling a polymerization gas-phase initiator, which comprises two gas supply pipeline components, a communication pipeline, a collecting structure and a back blowing component, wherein the two gas supply pipeline components are symmetrically arranged, each gas supply pipeline component comprises a gas supply and gas storage structure, a gas supply pipeline and at least two pressure reducing valves arranged on the gas supply pipeline, the gas inlet end of the gas supply pipeline is communicated with the gas supply and gas storage structure, the two ends of the communication pipeline are respectively communicated with the gas supply pipelines of the two gas supply pipeline components, the gas outlet end of the gas supply pipeline is communicated with the collecting structure, and the back blowing component comprises a back blowing gas storage structure, a back blowing gas inlet pipeline and a back blowing gas outlet pipeline which are communicated with the gas supply pipeline, and the gas inlet end of the back blowing gas inlet pipeline is communicated with the back blowing gas storage structure. The device for precisely controlling the polymerization gas-phase initiator can solve the problems of complex structure, high operation difficulty and poor stability caused by a one-stage decompression mode of a gas-phase initiator system in the prior art.

Description

Device for precisely controlling polymerization reaction gas-phase initiator

Technical Field

The utility model relates to the technical field related to formaldehyde preparation equipment, in particular to a device for precisely controlling a polymerization reaction gas-phase initiator.

Background

The polymerization gas phase initiator is a cationic initiator, and the precise addition of the gas phase initiator in the polymerization has a key effect on the control of the polymerization temperature, the molecular weight distribution of the polymer and the quality control of the polymer. The gas phase medium of the previous polymerization reaction is added into a gas cylinder for one-stage decompression, and the adiabatic expansion causes larger temperature drop, so that the two-phase flow exists at the outlet of the control valve, the flow control of the gas phase medium is unstable, and the polymerization reaction stability is affected. The gas phase initiator system is originally designed with a flow path of stopping, blowing and driving a single-line flowmeter to operate and a standby flowmeter to simultaneously blow. But dead angles exist, impurities are easy to accumulate, a metering element and a valve are blocked, the operation of replacing a pressure reducing valve and other valves is frequent, the operation is complex, and the process crossing difficulty is high.

From the above, the existing gas phase initiator system has the problems of complex structure, high operation difficulty and poor stability caused by a one-stage decompression mode.

Disclosure of Invention

The utility model mainly aims to provide a device for precisely controlling a polymerization gas-phase initiator, which aims to solve the problems that a gas-phase initiator system in the prior art has complex structure, high operation difficulty and poor stability caused by a one-stage decompression mode.

In order to achieve the above object, according to one aspect of the present utility model, there is provided an apparatus for precisely controlling a polymerization gas phase initiator, the apparatus for precisely controlling a polymerization gas phase initiator comprising two gas supply line assemblies symmetrically disposed, each gas supply line assembly comprising a gas supply and gas storage structure, a gas supply line, and at least two pressure reducing valves disposed on the gas supply line, a gas inlet end of the gas supply line being communicated with the gas supply and gas storage structure; the two ends of the communication pipeline are respectively communicated with the air supply pipelines of the two air supply pipeline assemblies; the air outlet end of the air supply pipeline is communicated with the collecting structure; the back blowing assembly comprises a back blowing gas storage structure, a back blowing air inlet pipeline and a back blowing air outlet pipeline, wherein the back blowing air inlet pipeline and the back blowing air outlet pipeline are communicated with the air supply pipeline, and the air inlet end of the back blowing air inlet pipeline is communicated with the back blowing gas storage structure.

Further, the device for precisely controlling the polymerization reaction gas-phase initiator further comprises a heater, wherein the heater is arranged on the air inlet pipeline and divides the air inlet pipeline into a first pipe section and a second pipe section, at least one pressure reducing valve is arranged on the first pipe section, and at least one other pressure reducing valve is arranged on the second pipe section.

Further, the communication pipeline is arranged between the two symmetrically arranged first pipe sections; and/or the communication pipeline is arranged between the two symmetrically arranged second pipe sections.

Further, two pressure reducing valves are respectively arranged, the first pressure reducing valve is arranged on the first pipe section, the second pressure reducing valve is arranged on the second pipe section, the device for accurately controlling the polymerization gas phase initiator further comprises a first control valve, the first control valve is arranged on the first pipe section, and the first control valve is positioned on one side of the first pressure reducing valve far away from the gas supply and storage structure; the second control valve is arranged on the second pipe section and is positioned on one side of the second pressure reducing valve away from the gas supply and storage structure.

Further, the apparatus for precisely controlling the polymerization reaction gas-phase initiator further includes a filter assembly disposed on the second pipe section, the filter assembly including a first filter disposed between the heater and the second pressure reducing valve, a second filter disposed between the second pressure reducing valve and the second control valve; and a flow meter disposed between the second filter and the second control valve.

Further, one of the two symmetrically arranged air inlet pipelines is an upper pipeline, the other one is a lower pipeline, the communication pipeline comprises a first communication pipe, the first communication pipe is arranged between the upper pipeline and the lower pipeline, an inlet of the first communication pipe is communicated with a pipeline between a first pressure reducing valve and a first control valve on the upper pipeline, and an outlet of the first communication pipe is communicated with a pipeline between the first control valve and a heater on the lower pipeline; the third control valve is arranged on the first communication pipe; the second communicating pipe is arranged between the upper pipeline and the lower pipeline, the inlet of the second communicating pipe is communicated with the pipeline between the first pressure reducing valve and the first control valve on the lower pipeline, and the outlet of the second communicating pipe is communicated with the pipeline between the first control valve and the heater on the upper pipeline; and a fourth control valve provided on the second communication pipe.

Further, one of the two air inlet pipelines which are symmetrically arranged is an upper pipeline, the other one is a lower pipeline, the back-blowing air inlet pipeline comprises a first back-blowing pipeline, an air inlet of the first back-blowing pipe is communicated with a back-blowing air storage structure, and an air blowing opening of the first back-blowing pipe is communicated with a pipeline between a first pressure reducing valve and a first control valve on the upper pipeline; the air inlet of the second back blowing pipe is communicated with the back blowing air storage structure, and the air blowing port of the second back blowing pipe is communicated with a pipeline between the first pressure reducing valve and the first control valve on the lower pipeline; the air inlet of the third blowback pipe is communicated with the blowback air storage structure; the air inlet of the fourth back blowing pipeline is communicated with the air blowing port of the third back blowing pipeline, and the air blowing port of the fourth back blowing pipeline is communicated with the pipeline between the second pressure reducing valve and the second control valve on the upper pipeline; the air inlet of the fifth back blowing pipeline is communicated with the air blowing port of the third back blowing pipeline, and the air blowing port of the fifth back blowing pipeline is communicated with the pipeline between the second pressure reducing valve and the second control valve on the lower pipeline; and the air inlet of the sixth back blowing pipeline is communicated with the air outlets of the upper pipeline and the lower pipeline.

Further, one of the two air inlet pipelines is an upper pipeline, the other air inlet pipeline is a lower pipeline, the back blowing air outlet pipeline comprises a first air outlet pipeline, one end of the first air outlet pipeline is communicated with a pipeline between a first control valve and a heater on the upper pipeline, and the other end of the first air outlet pipeline is used for outflow of air; one end of the second air outlet pipeline is communicated with the pipeline between the first control valve and the heater on the lower pipeline, and the other end of the second air outlet pipeline is used for flowing out gas; one end of the third air outlet pipeline is communicated with a pipeline between the second filter and the second control valve on the upper pipeline, and the other end of the third air outlet pipeline is used for flowing out gas; and one end of the fourth air outlet pipeline is communicated with the pipeline between the second filter and the second control valve on the lower pipeline, and the other end of the fourth air outlet pipeline is used for flowing out gas.

Further, the back blowing assembly further comprises a pressure gauge, and the pressure gauge is arranged at the air outlet end of the back blowing air storage structure; the pressure regulating valve is arranged on a pipeline between the air outlet of the back-blowing air storage structure and the pressure gauge.

Further, the device for precisely controlling the polymerization reaction gas-phase initiator further comprises a first gas passing pipe, wherein the first gas passing pipe is arranged between the gas inlet pipeline and the collecting structure; the first air passing pipe and the second air passing pipe are arranged in parallel; the gas passing control valve is arranged on the first gas passing pipe and the second gas passing pipe respectively.

By applying the technical scheme of the utility model, the device for precisely controlling the polymerization gas-phase initiator comprises two symmetrically arranged gas supply pipeline components, a communication pipeline, a collecting structure and a back blowing component, wherein each gas supply pipeline component comprises a gas supply and gas storage structure, a gas supply pipeline and at least two pressure reducing valves arranged on the gas supply pipeline, the gas inlet end of the gas supply pipeline is communicated with the gas supply and gas storage structure, the two ends of the communication pipeline are respectively communicated with the gas supply pipelines of the two gas supply pipeline components, the gas outlet end of the gas supply pipeline is communicated with the collecting structure, and the back blowing component comprises a back blowing gas storage structure, a back blowing gas inlet pipeline and a back blowing gas outlet pipeline which are communicated with the gas supply pipeline, and the gas inlet end of the back blowing gas inlet pipeline is communicated with the back blowing gas storage structure.

The air supply pipeline components are symmetrically arranged, so that the air supply pipeline assembly is simple to manufacture; meanwhile, the communicating pipes are arranged between the symmetrically arranged air supply pipeline assemblies, so that when a single air supply pipeline assembly is blocked, the air can flow into the other air supply pipeline assembly through the communicating pipes, and the phenomenon that the single air supply pipeline is blocked to cause incapacity of working can be avoided.

The back-blowing air inlet pipeline and the back-blowing air outlet pipeline are arranged on the air inlet pipeline, so that the back-blowing air storage structure can realize the back-blowing effect of each pipe section in the symmetrically arranged air supply pipeline assembly, harmful gas is prevented from staying in the air supply pipeline, and the safety is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 is a block diagram showing the installation relationship of the apparatus for precisely controlling a polymerization reaction gas phase initiator of the present utility model.

Wherein the above figures include the following reference numerals:

10. a gas supply line assembly; 110. a gas supply and storage structure; 120. an air supply line; 121. a first pipe section; 122. a second pipe section; 131. a first pressure reducing valve; 132. a second pressure reducing valve; 20. a collection structure; 310. a back-blowing gas storage structure; 320. a pressure gauge; 330. a pressure regulating valve; 340. a second blowback pipeline; 350. a first blowback line; 360. a third blowback pipeline; 370. a fourth blowback pipeline; 380. a fifth blowback pipeline; 390. a sixth blowback pipeline; 3110. a first outlet line; 3120. a second outlet gas line; 3130. a third air outlet pipeline; 3140. a fourth outlet line; 40. a heater; 50. a first control valve; 610. a first filter; 620. a second filter; 710. a flow meter; 720. an ammeter box; 810. a first communication pipe; 820. a third control valve; 830. a second communicating pipe; 840. a fourth control valve; 910. a first gas passing pipe; 920. a second gas passing pipe; 930. an overgas control valve; 1100. and a second control valve.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs unless otherwise indicated.

In the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

The utility model provides a device for precisely controlling a polymerization gas-phase initiator, which aims to solve the problems that a gas-phase initiator system in the prior art has complex structure and high operation difficulty and has poor stability caused by a one-stage decompression mode.

As shown in fig. 1, the device for precisely controlling the polymerization gas phase initiator comprises two gas supply pipeline assemblies 10, a communication pipeline, a collecting structure 20 and a blowback assembly, wherein the two gas supply pipeline assemblies 10 are symmetrically arranged, each gas supply pipeline assembly 10 comprises a gas supply and gas storage structure 110, a gas supply pipeline 120 and at least two pressure reducing valves arranged on the gas supply pipeline 120, the gas inlet end of the gas supply pipeline 120 is communicated with the gas supply and gas storage structure 110, the two ends of the communication pipeline are respectively communicated with the gas supply pipelines 120 of the two gas supply pipeline assemblies 10, the gas outlet end of the gas supply pipeline 120 is communicated with the collecting structure 20, and the blowback assembly comprises a blowback gas storage structure 310, and a blowback gas inlet pipeline and a blowback gas outlet pipeline which are communicated with the gas supply pipeline 120, and the gas inlet end of the blowback gas inlet pipeline is communicated with the blowback gas storage structure 310.

Specifically, the utility model is matched with the collection assembly by arranging the symmetrically arranged air supply pipeline assemblies 10, and the air supply pipeline assemblies 10 are symmetrically arranged, so the manufacture is simple; meanwhile, the communication pipes are arranged between the symmetrically arranged air supply pipeline assemblies 10, so that when a single air supply pipeline assembly 10 is blocked, the air can flow into the other air supply pipeline assembly 10 through the communication pipes, and the phenomenon that the single air supply pipeline 120 is blocked and cannot work can be avoided.

Further, the two pressure reducing valves of the present utility model are disposed on the air supply line 120 at intervals to achieve the technical effect of multi-stage pressure reduction. Of course, the utility model can also be provided with three, four and other pressure reducing valves on the air supply pipeline 120 to gradually reduce the pressure of the gas phase.

The gas supply and storage structure 110 of the present utility model is a high-pressure resistant metal bottle, such as a steel bottle, in which a gas in a high-pressure state is placed.

In this embodiment, the back-blowing air inlet pipeline and the back-blowing air outlet pipeline are arranged on the air inlet pipeline, so that the back-blowing air storage structure 310 can realize the back-blowing effect of each pipe section in the symmetrically arranged air supply pipeline assembly 10, and harmful air is prevented from staying in the air supply pipeline 120, thereby improving the safety.

As shown in fig. 1, the apparatus for precisely controlling the polymerization gas phase initiator further includes a heater 40, the heater 40 being disposed on the gas inlet line and dividing the gas inlet line into a first pipe section 121 and a second pipe section 122, at least one pressure reducing valve being disposed on the first pipe section 121, and at least one other pressure reducing valve being disposed on the second pipe section 122.

Specifically, by arranging the heater 40 on the air supply pipeline 120, pipeline heat tracing and heating are increased, the rapid temperature drop at the outlet of the control valve in the adiabatic expansion process of the gas phase initiator is avoided, two-phase flow is generated, and the pressure fluctuation of the gas phase medium is reduced.

Further, when two pressure reducing valves are provided, the two pressure reducing valves are respectively provided at two ends of the heater 40, and the two pressure reducing valves realize pressure reduction on the gas medium flowing out of the gas supply and storage structure 110 and flowing through the heater 40, so that the flow stability is improved.

In this embodiment, in order to avoid that the gas flow cannot be realized in the gas supply pipeline 120 after a certain section of the gas supply pipeline is blocked, the present utility model adopts a means of arranging a communication pipeline, as shown in fig. 1, between two symmetrically arranged first pipe sections 121, so that gas flow transfer can be realized between the two symmetrically arranged first pipe sections 121. It is also possible that the communication line is arranged between two symmetrically arranged second pipe sections 122, so that an air flow transfer can be realized between the two symmetrically arranged second pipe sections 122. Of course, in order to realize gas transfer between the first pipe section 121 and the second pipe section 122, a communication pipeline may be provided between the two first pipe sections 121 and the two second pipe sections 122.

It should be noted that the gas transferred from the gas transfer means can be moved to the inside of the other gas supply line 120 through the communication line, so as to avoid the blocking area.

As shown in the drawing, the two pressure reducing valves are a first pressure reducing valve and a second pressure reducing valve 132, respectively, the first pressure reducing valve 131 is provided on the first pipe section 121, the second pressure reducing valve 132 is provided on the second pipe section 122, the apparatus for precisely controlling the polymerization reaction gas phase initiator further comprises a first control valve 50 and a second control valve 1100, the first control valve 50 is provided on the first pipe section 121 in the direction of gas flow, the first control valve 50 is located downstream of the first pressure reducing valve 131, the second control valve 1100 is provided on the second pipe section 122 in the direction of gas flow, and the second control valve 1100 is located downstream of the second pressure reducing valve 132.

Specifically, after the gas flows out from the gas supply and storage structure 110, the pressure is reduced through the first pressurization valve at this time because the pressure is high, the flow of the gas is controlled through the control valve after the pressure is reduced, and the gas after the pressure is reduced is convenient to control and regulate. Similarly, the gas secondarily passed through the second pressure reducing valve 132 to realize secondary pressure reduction is conveniently flow-controlled, and thus the second control valve 1100 is disposed downstream of the second pressure reducing valve 132.

Further, the symmetrically arranged air supply pipeline assemblies 10 are provided with the first control valves 50 and the second control valves 1100, the two first control valves 50 are symmetrically arranged, and the two second control valves 1100 are symmetrically arranged.

In this embodiment, the apparatus for precisely controlling the polymerization reaction gas phase initiator further includes a filter assembly disposed on the second pipe section 122, the filter assembly including a first filter 610 disposed between the heater 40 and the second pressure reducing valve 132, a second filter 620 disposed between the second pressure reducing valve 132 and the second control valve 1100.

The filter assemblies are symmetrically arranged on the two air supply pipeline assemblies 10, and the first filter 610 and the second filter 620 are arranged on the second pipeline section 122 so as to filter flowing air in the second pipeline section 122 and avoid the structure of fixed particles in the air.

Further, the apparatus for precisely controlling the polymerization reaction gas phase initiator further includes a flow meter 710, and the flow meter 710 is disposed between the second filter 620 and the second control valve 1100. Two flow meters 710 on the two air supply lines 120 are disposed inside the same meter box.

In this embodiment, the flow meters 710 on the upper and lower pipes are placed in the same meter box 720.

As shown in fig. 1, one of the two intake pipes symmetrically provided is an upper pipe, the other is a lower pipe, the communication pipe includes a first communication pipe 810, a third control valve 820, a second communication pipe 830, and a fourth control valve 840, the first communication pipe 810 is provided between the upper pipe and the lower pipe, an inlet of the first communication pipe 810 is communicated with a pipe between the first pressure reducing valve 131 and the first control valve 50 on the upper pipe, an outlet of the first communication pipe 810 is communicated with a pipe between the first control valve 50 and the heater 40 on the lower pipe, the third control valve 820 is provided on the first communication pipe 810, the second communication pipe 830 is provided between the upper pipe and the lower pipe, an inlet of the second communication pipe 830 is communicated with a pipe between the first pressure reducing valve 131 and the first control valve 50 on the lower pipe, an outlet of the second communication pipe 830 is communicated with a pipe between the first control valve 50 and the heater 40 on the upper pipe, and the fourth control valve is provided on the second communication pipe 830.

Specifically, a first communication pipe 810 and a second communication pipe 830 are disposed between the two first pipe sections 121 of the upper pipe and the lower pipe, wherein the gas in the first pipe section 121 of one upper pipe can flow into the other first pipe section 121 through the first communication pipe 810, and the gas in the other first pipe section 121 can also flow into one of the first pipe sections 121 through the second communication pipe 830.

Further, the flow path of the control gas is realized by controlling the on-off state of the first communication pipe 810 and the second communication pipe 830 by providing the third control valve 820 and the fourth control valve 840.

In this embodiment, the blowback intake pipe includes a first blowback pipe 350, a second blowback pipe 340, a third blowback pipe 360, a fourth blowback pipe 370, a fifth blowback pipe 380 and a sixth blowback pipe 390, the air inlet of the first blowback pipe is in communication with the blowback air storage structure 310, the air inlet of the first blowback pipe is in communication with the pipe between the first pressure reducing valve 131 and the first control valve 50 on the upper pipe, the air inlet of the second blowback pipe is in communication with the blowback air storage structure 310, the air inlet of the second blowback pipe is in communication with the pipe between the first pressure reducing valve 131 and the first control valve 50 on the lower pipe, the air inlet of the third blowback pipe is in communication with the blowback air storage structure 310, the air inlet of the fourth blowback pipe 370 is in communication with the air inlet of the third blowback pipe 360, the air inlet of the fifth blowback pipe 380 is in communication with the pipe between the second pressure reducing valve 132 and the second control valve 1100 on the upper pipe, the air inlet of the fifth blowback pipe 380 is in communication with the air inlet of the sixth blowback pipe 132 and the sixth blowback pipe 390.

Specifically, the first blowback pipeline 350, the second blowback pipeline 340, the fourth blowback pipeline 370, the fifth blowback pipeline 380 and the sixth blowback pipeline 390 are respectively communicated with different pipe sections on the air supply pipeline 120, so as to realize blowback of the whole air supply pipeline 120 through the blowback air storage structure 310.

Further, control valves are respectively disposed on the first blowback pipeline 350, the second blowback pipeline 340, the third blowback pipeline 360, the fourth blowback pipeline 370, the fifth blowback pipeline 380 and the sixth blowback pipeline 390 to control the on-off of the blowback gas, and further control the circulation path of the blowback gas.

Further, the back-blowing gas storage structure 310 stores nitrogen inside.

Further, the blowback gas pipe includes a first gas pipe 3110, a second gas pipe 3120, a third gas pipe 3130, and a fourth gas pipe 3140, one end of the first gas pipe 3110 is in pipe communication with the first control valve 50 and the heater 40 on the upper pipe, the other end of the first gas pipe 3110 is for gas outflow, one end of the second gas pipe 3120 is in pipe communication with the first control valve 50 and the heater 40 on the lower pipe, the other end of the second gas pipe 3120 is for gas outflow, one end of the third gas pipe 3130 is in pipe communication with the second filter 620 and the second control valve 1100 on the upper pipe, the other end of the third gas pipe 3130 is for gas outflow, one end of the fourth gas pipe 3140 is in pipe communication with the second filter 620 and the second control valve 1100 on the lower pipe, and the other end of the fourth gas pipe 3140 is for gas outflow.

Wherein, the first air outlet pipe 3110, the second air outlet pipe 3120, the third air outlet pipe 3130 and the fourth air outlet pipe 3140 are all provided with control valves to realize control of on-off of back-blowing gas.

In this embodiment, when the back blowing operation is performed, the air supply and storage structure 110 stops the air supply, and the back blowing air may enter the air supply pipeline 120 through the first back blowing pipeline 350 and be blown out through the third air outlet pipeline 3130; the back-blowing gas may enter the gas supply pipeline 120 after passing through the third back-blowing pipeline 360 and the fourth back-blowing pipeline 370 and flow out through the first gas outlet pipeline 3110 to realize reverse flow; the back-blowing gas may flow in the reverse direction through the third back-blowing pipe 360 and the sixth back-blowing pipe 390, enter the gas supply pipe 120, and flow out through the first gas outlet pipe 3110.

Of course, the purging can be performed section by section, and the purging process is shortened, so that the replacement discharge amount is small, and the environment is friendly. That is, the first blowback gas 350 enters the air supply line 120 and is blown out through the first air outlet line 3110, the blowback gas enters the air supply line 120 through the third blowback line 360 and the fourth blowback line 370 and is blown out through the third air outlet line 3130, and the blowback gas enters the air supply line 120 through the third blowback line 360 and the sixth blowback line 390 and is blown out through the third air outlet line 3130.

As shown in fig. 1, the blowback assembly further includes a pressure gauge 320 and a pressure regulating valve 330, the pressure gauge 320 is disposed at the air outlet end of the blowback air storage structure 310, and the pressure regulating valve 330 is disposed on a pipeline between the air outlet of the blowback air storage structure 310 and the pressure gauge 320.

Specifically, the pressure gauge 320 is used for monitoring the gas pressure flowing out from the gas outlet end of the blowback gas storage structure 310 in real time, and the pressure regulating valve 330 is used for regulating the gas pressure.

In this embodiment, the apparatus for precisely controlling the polymerization gas phase initiator further includes a first gas passing pipe 910, a second gas passing pipe 920 and a gas passing control valve 930, wherein the first gas passing pipe 910 is disposed between the gas inlet pipe and the collecting structure 20, the second gas passing pipe 920 is disposed between the gas inlet pipe and the collecting structure 20, the first gas passing pipe 910 and the second gas passing pipe 920 are disposed in parallel, and the gas passing control valve 930 is disposed on the first gas passing pipe 910 and the second gas passing pipe 920, respectively.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

by applying the technical scheme of the utility model, the symmetrically arranged air supply pipeline assemblies 10 and the collecting assemblies are matched for use, and the air supply pipeline assemblies 10 are symmetrically arranged, so that the manufacturing is simple; meanwhile, the communication pipes are arranged between the symmetrically arranged air supply pipeline assemblies 10, so that when a single air supply pipeline assembly 10 is blocked, the air can flow into the other air supply pipeline assembly 10 through the communication pipes, and the phenomenon that the single air supply pipeline 120 is blocked and cannot work can be avoided. The back-blowing air inlet pipeline and the back-blowing air outlet pipeline are arranged on the air inlet pipeline, so that the back-blowing air storage structure 310 can realize the back-blowing effect of each pipe section in the symmetrically arranged air supply pipeline assembly 10, harmful air is prevented from staying in the air supply pipeline 120, and the safety is improved.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An apparatus for precisely controlling a polymerization gas phase initiator, comprising:

the device comprises two symmetrically arranged air supply pipeline assemblies (10), wherein each air supply pipeline assembly (10) comprises an air supply and storage structure (110), an air supply pipeline (120) and at least two pressure reducing valves arranged on the air supply pipeline (120), and an air inlet end of the air supply pipeline (120) is communicated with the air supply and storage structure (110);

the two ends of the communication pipeline are respectively communicated with the air supply pipelines (120) of the two air supply pipeline assemblies (10);

a collection structure (20), wherein the air outlet end of the air supply pipeline (120) is communicated with the collection structure (20);

the back blowing assembly comprises a back blowing gas storage structure (310), a back blowing air inlet pipeline and a back blowing air outlet pipeline, wherein the back blowing air inlet pipeline and the back blowing air outlet pipeline are communicated with the air supply pipeline (120), and the air inlet end of the back blowing air inlet pipeline is communicated with the back blowing gas storage structure (310).

2. The apparatus for precise control of a polymerization gas phase initiator of claim 1, further comprising:

the heater (40), the heater (40) is arranged on the air inlet pipeline, and divide the air inlet pipeline into a first pipe section (121) and a second pipe section (122), at least one pressure reducing valve is arranged on the first pipe section (121), and at least one other pressure reducing valve is arranged on the second pipe section (122).

3. The apparatus for precisely controlling a polymerization gas-phase initiator according to claim 2, wherein,

the communication pipeline is arranged between two symmetrically arranged first pipe sections (121); and/or

The communication pipeline is arranged between two second pipe sections (122) which are symmetrically arranged.

4. The apparatus for precisely controlling a polymerization gas phase initiator according to claim 2, wherein two pressure reducing valves are provided, the two pressure reducing valves being a first pressure reducing valve and a second pressure reducing valve (132), respectively, the first pressure reducing valve (131) being provided on the first pipe section (121), the second pressure reducing valve (132) being provided on the second pipe section (122), the apparatus for precisely controlling a polymerization gas phase initiator further comprising:

a first control valve (50), wherein the first control valve (50) is arranged on the first pipe section (121), and the first control valve (50) is positioned at one side of the first pressure reducing valve (131) away from the air supply and storage structure (110);

and the second control valve (1100) is arranged on the second pipe section (122), and the second control valve (1100) is positioned on one side of the second pressure reducing valve (132) away from the air supply and storage structure (110).

5. The apparatus for precise control of a polymerization gas phase initiator of claim 4, further comprising:

a filter assembly disposed on the second pipe section (122), the filter assembly including a first filter (610) disposed between the heater (40) and the second pressure relief valve (132), a second filter (620) disposed between the second pressure relief valve (132) and the second control valve (1100);

-a flow meter (710), the flow meter (710) being arranged between the second filter (620) and the second control valve (1100).

6. The apparatus for precisely controlling a polymerization gas phase initiator according to claim 4, wherein one of the two symmetrically disposed gas inlet lines is an upper line and the other is a lower line, and the communicating line comprises:

a first communication pipe (810), the first communication pipe (810) being disposed between the upper pipe and the lower pipe, an inlet of the first communication pipe (810) being in communication with a pipe between the first pressure reducing valve (131) and the first control valve (50) on the upper pipe, an outlet of the first communication pipe (810) being in communication with a pipe between the first control valve (50) and the heater (40) on the lower pipe;

a third control valve (820), the third control valve (820) being disposed on the first communication pipe (810);

a second communicating pipe (830), the second communicating pipe (830) being disposed between the upper pipe and the lower pipe, an inlet of the second communicating pipe (830) being in communication with a pipe between the first pressure reducing valve (131) and the first control valve (50) on the lower pipe, an outlet of the second communicating pipe (830) being in communication with a pipe between the first control valve (50) and the heater (40) on the upper pipe;

and a fourth control valve (840), the fourth control valve (840) being provided on the second communication pipe (830).

7. The apparatus for precisely controlling a polymerization gas phase initiator according to claim 5, wherein one of the two symmetrically disposed gas inlet lines is an upper line and the other is a lower line, and the blowback gas inlet line comprises:

a first back-blowing pipeline (350), wherein an air inlet of the first back-blowing pipe is communicated with the back-blowing air storage structure (310), and an air blowing port of the first back-blowing pipe is communicated with a pipeline between the first pressure reducing valve (131) and the first control valve (50) on the upper pipeline;

a second blowback pipe (340), an air inlet of the second blowback pipe is communicated with the blowback air storage structure (310), and an air outlet of the second blowback pipe is communicated with a pipe between the first pressure reducing valve (131) and the first control valve (50) on the lower pipe;

a third blowback pipe (360) having an air inlet in communication with the blowback gas storage structure (310);

a fourth blowback pipe (370), an air inlet of the fourth blowback pipe (370) is communicated with an air blowing port of the third blowback pipe (360), and the air blowing port of the fourth blowback pipe (370) is communicated with a pipe between the second pressure reducing valve (132) and the second control valve (1100) on the upper pipe;

a fifth blowback pipe (380), an air inlet of the fifth blowback pipe (380) is communicated with an air blowing port of the third blowback pipe (360), and the air blowing port of the fifth blowback pipe (380) is communicated with a pipe between the second pressure reducing valve (132) and the second control valve (1100) on the lower pipe;

and the air inlet of the sixth back blowing pipeline (390) is communicated with the air blowing opening of the third back blowing pipeline (360), and the air blowing opening of the sixth back blowing pipeline (390) is communicated with the air outlets of the upper pipeline and the lower pipeline.

8. The apparatus for precisely controlling a polymerization gas phase initiator according to claim 5, wherein one of the two symmetrically disposed gas inlet lines is an upper line and the other is a lower line, and the back-blowing gas outlet line comprises:

a first gas outlet pipe (3110), one end of the first gas outlet pipe (3110) is communicated with a pipe between the first control valve (50) and the heater (40) on the upper pipe, and the other end of the first gas outlet pipe (3110) is used for gas outflow;

a second gas outlet pipe (3120), one end of the second gas outlet pipe (3120) being in communication with a pipe between the first control valve (50) and the heater (40) on the lower pipe, the other end of the second gas outlet pipe (3120) being for gas outflow;

a third air outlet pipeline (3130), one end of the third air outlet pipeline (3130) is communicated with a pipeline between the second filter (620) and the second control valve (1100) on the upper pipeline, and the other end of the third air outlet pipeline (3130) is used for outflow of air;

and a fourth air outlet pipeline (3140), wherein one end of the fourth air outlet pipeline (3140) is communicated with a pipeline between the second filter (620) and the second control valve (1100) on the lower pipeline, and the other end of the fourth air outlet pipeline (3140) is used for outflow of air.

9. The apparatus for precise control of a polymerization gas phase initiator according to any one of claims 1 to 8, wherein the blowback assembly further comprises:

the pressure gauge (320) is arranged at the air outlet end of the back-blowing air storage structure (310);

the pressure regulating valve (330) is arranged on a pipeline between the air outlet of the back-blowing air storage structure (310) and the pressure gauge (320).

10. The apparatus for precise control of a polymerization gas phase initiator according to any one of claims 1 to 8, further comprising:

-a first gas pipe (910), the first gas pipe (910) being arranged between the inlet line and the collecting structure (20);

a second gas pipe (920), the second gas pipe (920) being arranged between the gas inlet line and the collecting structure (20), the first gas pipe (910) and the second gas pipe (920) being arranged in parallel;

and an air passing control valve (930), wherein the air passing control valve (930) is respectively arranged on the first air passing pipe (910) and the second air passing pipe (920).