CN218901872U

CN218901872U - Novel efficient R22 cracking reactor

Info

Publication number: CN218901872U
Application number: CN202223148243.9U
Authority: CN
Inventors: 朱好言; 周广兵; 孙道成; 闫志强; 谷启文; 董经代; 王得草; 赵洪刚
Original assignee: Liaocheng Fuer New Material Science & Technology Co ltd
Current assignee: Liaocheng Fuer New Material Science & Technology Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-04-25
Anticipated expiration: 2032-11-28

Abstract

The utility model aims to solve the technical problem of providing a novel efficient R22 cracking reactor, wherein when the diameter of the reactor is increased, R22 and water vapor are uniformly mixed through a mixer, so that the cracking efficiency is improved; a mixer is arranged between the steam inlet pipe and the pi-shaped reaction pipe body, the mixer comprises a mixer outer cylinder body, the head end of the mixer outer cylinder body is communicated with the steam inlet pipe, the tail end of the mixer outer cylinder body is communicated with a mixer reducing pipe section, and the tail end of the mixer reducing pipe section is communicated with the left end of the pi-shaped reaction pipe body; the side wall of the outer cylinder of the mixer is provided with an R22 inlet pipe.

Description

Novel efficient R22 cracking reactor

Technical Field

The utility model relates to the technical field of tetrafluoroethylene production by a fluorine chemical R22 cracking reaction, in particular to a reactor for R22 cracking, and particularly relates to a novel efficient R22 cracking reactor.

Background

As is well known, the prior art (CN 101973843 a) discloses a technology for preparing tetrafluoroethylene by diluting and cracking difluoromethane and water vapor, wherein tetrafluoroethylene is produced by diluting and cracking R22 water vapor, in the process of producing tetrafluoroethylene by diluting and cracking R22 water vapor, a cracking reactor is used as a pi-type reactor, the capacity of a single device in the same industry is 1.2 ten thousand tons/year at the maximum, the pipe diameter of the pi-type reactor is generally DN125 or DN150 single pipe capacity is about 2500t/a, the single production capacity is about 4 ten thousand tons/year, or the single pipe capacity is calculated according to two heating furnaces, the single pipe capacity is 5000t/a, each heating furnace needs to be provided with 4 pi-type reactors, the pipe diameter of the reactor needs to be increased to DN200, the mixing of the two materials can be unevenly heated according to the original structure, the cracking conversion rate and the selectivity are low, the production capacity can not reach the design requirements, and the energy consumption is increased.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a novel efficient R22 cracking reactor, wherein when the diameter of the reactor is increased, R22 and water vapor are uniformly mixed by a mixer, so that the cracking efficiency is improved.

The utility model is realized by the following technical scheme:

the efficient novel R22 cracking reactor comprises a pi-shaped reaction tube body, wherein the left end of the pi-shaped reaction tube body is communicated with a steam inlet tube, and the right end of the pi-shaped reaction tube body is communicated with a reactant outlet tube;

a mixer is arranged between the steam inlet pipe and the pi-shaped reaction pipe body, the mixer comprises a mixer outer cylinder body, the head end of the mixer outer cylinder body is communicated with the steam inlet pipe, the tail end of the mixer outer cylinder body is communicated with a mixer reducing pipe section, and the tail end of the mixer reducing pipe section is communicated with the left end of the pi-shaped reaction pipe body;

the side wall of the outer cylinder of the mixer is provided with an R22 inlet pipe.

Further, the tail end of the reducing pipe section of the mixer is communicated with the left end of the pi-shaped reaction pipe body through a nozzle pipe, and the front section of the nozzle pipe is a straight pipe, and the rear section of the nozzle pipe is a conical expansion pipe with gradually increased inner diameter.

Further, the tail end of the steam inlet pipe penetrates through the head end of the outer cylinder body of the mixer.

Furthermore, the tail end of the pi-shaped reaction tube body and the side wall of the steam inlet tube are provided with inserted temperature measuring points, and two inserted temperature measuring points are provided with inserted temperature measuring meters.

Further, the steam inlet pipe and the reactant outlet pipe are both of bent pipe structures, the radius of a bent pipe of the steam inlet pipe is 500mm, and the radius of a bent pipe of the reactant outlet pipe is 600mm.

Compared with the prior art, the utility model has the following beneficial effects:

1. when the pipe diameter of the reactor is increased for improving the production capacity, a mixer is arranged between the steam inlet pipe and the pi-shaped reaction pipe body, the mixer can fully and uniformly mix R22 and water vapor, the cracking efficiency is improved, the conversion rate and the selectivity can reach the level of the existing device, and the effect after the extraction is achieved;

2. the steam sequentially passes through the outer cylinder of the mixer and the reducing pipe section of the mixer from the steam inlet pipe, and as the inner diameter of the reducing pipe section of the mixer is gradually reduced, the flow speed of the steam is increased, so that negative pressure is formed, R22 entering the R22 inlet pipe is sucked into the nozzle pipe and fully mixed, and finally enters the pi-shaped reaction pipe body through the conical expansion pipe for reaction, so that the two materials are fully mixed, the uniform distribution of cracking heat is ensured, and the proper conversion rate and high selectivity of R22 are effectively ensured;

3. the tail end of the pi-shaped reaction tube body and the side wall of the steam inlet tube are provided with the inserted type thermometer, so that the accuracy of the temperature measuring point is improved compared with that of the traditional wall-attached type thermometer, the control of the cracking temperature is facilitated, and the conversion rate and the selectivity can be effectively controlled.

Drawings

FIG. 1 is a schematic diagram of a high-efficiency novel R22 cracking reactor according to the utility model;

FIG. 2 is a schematic view of a mixer according to the present utility model;

in the figure: 1. pi-type reaction tube body, 2, steam inlet tube, 3, reactant outlet tube, 4, mixer outer cylinder, 5, mixer reducing tube section, 6, nozzle tube, 7, R22 inlet tube, 8, plug-in thermometer.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings of the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.

In the description of the utility model, it should be understood that the terms "front," "rear," "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. The utility model will be further described with reference to the drawings and examples.

As is known, the diameter of a pi-type reactor is generally DN125 or DN150, the single tube capacity is about 2500t/a, the single tube capacity is about 4 ten thousand tons/year to be calculated according to two heating furnaces, the single tube capacity is 5000t/a, each heating furnace needs to be provided with 4 pi-type reactors, the diameter of the reactor needs to be increased to DN200, the two materials are mixed according to the original structure, uneven heating can occur, the cracking conversion rate and the selectivity are low, the production capacity can not meet the design requirement, and the energy consumption is increased. To solve this problem, this embodiment discloses a novel efficient R22 cleavage reactor, which includes a pi-type reaction tube body 1, a steam inlet tube 2, a mixer, and a reactant outlet tube 3, as shown in fig. 1-2. The pi-shaped reaction tube body 1 is a pi-shaped reaction tube, the turning path of the pi-shaped reaction tube body is a 90-degree arc, and the radius of the pi-shaped reaction tube body is 600mm. The steam inlet pipe 2 and the reactant outlet pipe 3 are of bent pipe structures, the radius of a bent pipe of the steam inlet pipe 2 is 500mm, and the radius of a bent pipe of the reactant outlet pipe 3 is 600mm, so that the design effectively reduces the resistance and the thermal expansion of materials and ensures the residence time to be about 0.04 s.

The steam inlet pipe 2 is communicated with the left end of the pi-shaped reaction pipe body 1 through a mixer, and the right end of the pi-shaped reaction pipe body 1 is communicated with the reactant outlet pipe 3. The mixer comprises a mixer outer cylinder 4, a mixer reducing pipe section 5, a nozzle pipe 6 and the like. The tail end of the steam inlet pipe 2 penetrates through the head end of the mixer outer cylinder body 4 in an inserting mode, the side wall of the mixer outer cylinder body 4 is communicated with the R22 inlet pipe 7, the tail end of the mixer outer cylinder body 4 is communicated with the mixer reducing pipe section 5, the mixer reducing pipe section 5 is a conical pipe section with the inner diameter gradually decreasing along the material flowing direction, the tail end of the mixer reducing pipe section 5 is communicated with the left end of the pi-shaped reaction pipe body 1 through a nozzle pipe 6, and the front section and the rear section of the nozzle pipe 6 are straight pipes and conical expansion pipes with the inner diameter gradually increasing.

In order to effectively control the cracking temperature and further effectively control the conversion rate and the selectivity, the tail end of the pi-shaped reaction tube body 1 and the side wall of the steam inlet tube 2 are provided with inserted temperature measuring points, and the two inserted temperature measuring points are provided with inserted temperature measuring meters 8, so that the accuracy of the design is improved compared with that of the traditional wall-attached temperature measuring points.

The working principle of the efficient novel R22 cracking reactor in the embodiment is as follows:

r22 enters from the R22 inlet pipe, meanwhile, water vapor sequentially passes through the outer cylinder of the mixer and the reducing pipe section of the mixer from the steam inlet pipe, and as the inner diameter of the reducing pipe section of the mixer is gradually reduced, the flow speed of the water vapor is increased, so that negative pressure is formed, the R22 entering from the R22 inlet pipe is sucked into the nozzle pipe and fully mixed, and finally enters into the pi-shaped reaction pipe body through the conical expansion pipe for reaction, so that two materials are fully mixed, the uniform distribution of cracking heat is ensured, and the proper conversion rate and the high selectivity of the R22 are effectively ensured.

The implementation effect is compared with the traditional pi-type reactor in the following table of raw material consumption, conversion rate and selectivity:

reactor for producing a catalyst	R22 consumption kg/t	Conversion%	Selectivity%
				High-efficient novel R22 cracking reactor	1876	65.91	97.61
Traditional pi-type reactor	1895	65.22	97.11

By comparing the TFE selectivity of the novel efficient pi-type reactor with that of the traditional pi-type reactor, the TFE selectivity of the novel efficient pi-type reactor is obviously higher than that of the traditional pi-type reactor; the raw material consumption of the novel efficient pi-type reactor is obviously lower than that of the traditional pi-type reactor.

Claims

1. The efficient novel R22 cracking reactor comprises a pi-shaped reaction tube body, and is characterized in that the left end of the pi-shaped reaction tube body is communicated with a steam inlet tube, and the right end of the pi-shaped reaction tube body is communicated with a reactant outlet tube;

2. The efficient novel R22 cracking reactor according to claim 1, wherein the tail end of the reducing pipe section of the mixer is communicated with the left end of the pi-shaped reaction pipe body through a nozzle pipe, the front section of the nozzle pipe is a straight pipe, and the rear section of the nozzle pipe is a conical expansion pipe with gradually increased inner diameter.

3. The efficient novel R22 cracking reactor according to claim 2, wherein the tail end of the steam inlet pipe penetrates through the head end of the outer cylinder of the mixer.

4. The efficient novel R22 cracking reactor according to claim 1, wherein the tail end of the pi-shaped reaction tube body and the side wall of the steam inlet tube are provided with inserted temperature measuring points, and both inserted temperature measuring points are provided with inserted temperature measuring meters.

5. The efficient novel R22 cracking reactor according to any one of claims 1-4, wherein the steam inlet pipe and the reactant outlet pipe are both of a bent pipe structure, the radius of the bent pipe of the steam inlet pipe is 500mm, and the radius of the bent pipe of the reactant outlet pipe is 600mm.