Pyrolysis catalytic modification device for waste plastics

Abstract

The invention provides a waste plastic pyrolysis catalytic modification device. The waste plastic pyrolysis catalytic modification device comprises a first-stage pyrolysis module, a second-stage pyrolysis module, a solid pyrolysis product cooling module and a gas pyrolysis product catalytic modification module which are sequentially arranged from front to back. Wherein the first-stage pyrolysis module comprises a first-stage pyrolysis cavity and a first-stage spiral which is rotatably arranged in the first-stage pyrolysis cavity, and the first-stage pyrolysis cavity is communicated with a gas inlet header pipe; the second-stage pyrolysis module comprises a second-stage pyrolysis cavity and a second-stage spiral, the second-stage pyrolysis cavity is arranged below the first-stage pyrolysis cavity and communicates with the tail end of the first-stage pyrolysis cavity, the second-stage spiral is rotatably arranged in the second-stage pyrolysis cavity, the second-stage pyrolysis module communicates with the gas inlet header pipe, and the solid-state pyrolysis product cooling module is arranged below the second-stage pyrolysis cavity; the first-stage pyrolysis cavity communicates with the tail end of the second-stage pyrolysis cavity; the gaseous pyrolysis product catalytic modification module comprises a catalytic modification furnace upper cavity, the catalytic modification furnace upper cavity is communicated with a gas inlet header pipe through a plurality of gas inlet distribution pipes, and the problem that waste plastic pyrolysis is not thorough at present is solved.

Description

Technical Field

[0001] This invention relates to the field of polymer waste recycling technology, and in particular to a pyrolysis catalytic modification device for waste plastics. Background Technology Converting waste plastics into liquid fuel has become a promising solution. This method not only meets my country's current practical needs but also effectively alleviates the problem of "white pollution" while achieving resource recycling. However, the process of directly pyrolyzing waste plastics into fuel is not without challenges, and many problems have been found in actual use, resulting in incomplete pyrolysis of waste plastics. Summary of the Invention

[0002] To address the shortcomings of the existing technology, this invention provides a pyrolysis catalytic reforming device for waste plastics, comprising:

[0003] The modules arranged from front to back are: a primary pyrolysis module, a secondary pyrolysis module, a solid pyrolysis product cooling module, and a gaseous pyrolysis product catalytic modification module.

[0004] The primary pyrolysis module includes a primary pyrolysis chamber and a primary spiral rotatably disposed within the primary pyrolysis chamber. The primary pyrolysis chamber is connected to the main air intake pipe, and a primary electromagnetic heating mechanism is arranged around the outside of the primary pyrolysis chamber.

[0005] The secondary pyrolysis module includes a secondary pyrolysis chamber located below the primary pyrolysis chamber and connected to the end of the primary pyrolysis chamber, and a secondary spiral rotatably disposed within the secondary pyrolysis chamber. The secondary pyrolysis module is connected to the main air intake pipe, and a secondary electromagnetic heating mechanism is arranged around the outer periphery of the secondary pyrolysis chamber.

[0006] The solid pyrolysis product cooling module is located below the secondary pyrolysis chamber and is connected to the end of the secondary pyrolysis chamber; the gaseous pyrolysis product catalytic reforming module includes an upper chamber of a catalytic reforming furnace, which is connected to the main air inlet pipe through several air inlet distribution pipes.

[0007] The primary pyrolysis module, the secondary pyrolysis module, the solid pyrolysis product cooling module, and the gaseous pyrolysis product catalytic modification module are all mounted on the support frame platform, which is located on the ground.

[0008] In some embodiments, a feed hopper is provided on the upper front side of the primary pyrolysis chamber, which is connected to a silo; a nitrogen filling pipe is provided on the lower front side, which is connected to a nitrogen source; and a primary solid pyrolysis product outlet is provided on the lower rear side of the primary pyrolysis chamber.

[0009] In some embodiments, the primary spiral is arranged along the axis within the primary pyrolysis chamber and extends from the front end to the rear end of the primary pyrolysis chamber. Waste plastic enters the primary pyrolysis chamber from the feed hopper, is gradually pyrolyzed, and is conveyed backward by the primary spiral. The solid products after pyrolysis are discharged through the primary solid pyrolysis product outlet.

[0010] In some embodiments, a plurality of primary exhaust pipes are evenly spaced on the upper side of the primary pyrolysis chamber. The primary pyrolysis chamber is connected to the main air intake pipe through the primary exhaust pipes. The gas generated by the pyrolysis of waste plastic in the primary pyrolysis chamber is drawn into the main exhaust pipe through the primary exhaust pipes.

[0011] The primary pyrolysis module also includes a primary variable frequency speed control motor, which is located at the front end of the primary pyrolysis chamber. The primary variable frequency speed control motor is connected to the primary spiral and is used to drive the primary spiral to rotate.

[0012] In some embodiments, a secondary solid pyrolysis product inlet is provided on the upper front side of the secondary pyrolysis chamber, and a secondary solid pyrolysis product outlet is provided on the lower rear side. The secondary solid pyrolysis product inlet is connected to the primary solid pyrolysis product outlet. The solid products pyrolyzed in the primary pyrolysis chamber enter the secondary pyrolysis chamber for supplementary pyrolysis under the action of gravity through the primary solid pyrolysis product outlet and the secondary solid product inlet.

[0013] In some embodiments, the secondary spiral in the secondary pyrolysis chamber extends from one end of the secondary pyrolysis chamber to the other end. The solid product after pyrolysis by the primary pyrolysis module enters the secondary pyrolysis chamber from the secondary solid pyrolysis product inlet and is conveyed by the secondary spiral to gradually undergo supplementary pyrolysis and primary cooling. The solid product after pyrolysis and cooling is finally discharged from the secondary solid pyrolysis product outlet.

[0014] In some embodiments, a plurality of secondary exhaust pipes communicating with the main air intake pipe are evenly spaced on the upper side of the secondary pyrolysis chamber, and a one-way valve is provided in the secondary exhaust pipe;

[0015] The secondary pyrolysis module also includes a secondary variable frequency speed control motor, which is located at the front end of the secondary pyrolysis chamber. The output shaft of the secondary variable frequency speed control motor is connected to the secondary spiral, and the secondary variable frequency motor is used to drive the secondary spiral.

[0016] In some embodiments, the solid pyrolysis product cooling module includes a three-stage spiral discharge device, a cooling device, and a three-stage variable frequency speed control motor. The three-stage spiral discharge device includes a spiral cylinder and a discharge spiral. The spiral cylinder is disposed below the secondary pyrolysis chamber and is a cylindrical structure arranged horizontally in the front-back direction.

[0017] The discharge screw is rotatably mounted on the screw cylinder along the axis and extends from one end of the screw cylinder to the other end. The three-stage variable frequency speed control motor is located at the rear end of the screw cylinder. The output shaft of the three-stage variable frequency speed control motor is connected to the discharge screw, and the three-stage variable frequency speed control motor controls the rotational speed of the discharge screw.

[0018] The cooling device is used to cool down the three-stage screw discharge device. The cooling device includes a cooling jacket, which is arranged around the outer periphery of the screw cylinder, and a sealed cooling cavity is formed between the cooling jacket and the screw cylinder.

[0019] In some embodiments, the gaseous pyrolysis product catalytic reforming module further includes a lower chamber of the catalytic reforming furnace, a primary condenser, and a secondary condenser. The upper chamber of the catalytic reforming furnace is disposed on the upper surface of the lower chamber of the catalytic reforming furnace. The upper chamber of the catalytic reforming furnace is connected to the primary condenser, and the primary condenser is connected to the secondary condenser. Both the upper chamber and the lower chamber of the catalytic reforming furnace are completely sealed and isolated from each other.

[0020] In some embodiments, the lower cavity of the catalytic reforming furnace is connected to the superheated gas main pipe, and an inclined vibration motor is installed on the outer side of the upper cavity of the catalytic reforming furnace. The upper cavity of the catalytic reforming furnace is connected to the main gas inlet pipe through several gas inlet distribution pipes. A catalyst flat-laying mesh is installed in the upper cavity of the catalytic reforming furnace, and the catalyst flat-laying mesh is positioned above the gas inlet distribution pipes.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The waste plastic pyrolysis catalytic modification device provided by this invention is equipped with a primary pyrolysis module and a secondary pyrolysis module. The temperature in the primary pyrolysis chamber of the primary pyrolysis module is controlled at 600-700℃, and the temperature in the secondary pyrolysis chamber of the secondary pyrolysis module is controlled at 500-600℃. First, the primary pyrolysis module pyrolyzes the waste plastic, playing a major role in the thermal decomposition of the waste plastic. Then, the secondary pyrolysis module further pyrolyzes the solid pyrolysis products after the primary pyrolysis module. Through two-step pyrolysis, the waste plastic is pyrolyzed more completely, solving the problem of incomplete pyrolysis of waste plastic in the prior art.

[0023] In addition, the temperature of the secondary pyrolysis chamber is controlled at 500-600℃, which is one level lower than the temperature in the primary pyrolysis chamber. This design achieves the purpose of staged cooling. Then, the solid pyrolysis product cooling module further cools the secondary solid products. The staged cooling design realizes the full utilization of waste heat in the pyrolysis products and saves energy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pyrolysis catalytic reforming device shown in an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the direction from center to center;

[0026] Figure 3 yes Figure 1 A schematic diagram of the direction from center to point two;

[0027] In the attached figures, the following labels are used:

[0028] A - Primary pyrolysis module; B - Secondary pyrolysis module; C - Solid pyrolysis product cooling module; D - Gas-state pyrolysis product catalytic modification module;

[0029] 101-First-stage pyrolysis chamber; 102-First-stage spiral; 103-First-stage electromagnetic heating mechanism; 104-Feed hopper; 105-Nitrogen filling pipe; 106-First-stage solid pyrolysis product outlet; 107-First-stage exhaust pipe; 108-First-stage variable frequency speed control motor; 109-First-stage variable frequency speed control motor support frame; 1010-First-stage pyrolysis chamber support frame;

[0030] 2-Intake manifold;

[0031] 301-Secondary pyrolysis chamber; 302-Secondary spiral; 303-Secondary electromagnetic heating mechanism; 304-Secondary pyrolysis chamber support frame; 305-Secondary solid pyrolysis product inlet; 306-Secondary solid pyrolysis product outlet; 307-Secondary exhaust pipe; 308-One-way valve; 309-Secondary variable frequency speed control motor; 3010-Secondary variable frequency speed control motor support frame;

[0032] 401 - Upper cavity of catalytic reforming furnace; 402 - Inlet distribution pipe; 403 - Lower cavity of catalytic reforming furnace; 404 - Primary condenser; 405 - Secondary condenser; 406 - Observation hole of catalytic reforming furnace; 407 - Rectangular manual operation port; 408 - Exhaust pipe; 409 - Flexible connection; 4010 - Inlet pipe of condenser; 4011 - Inclined vibration motor; 4012 - Catalyst flat mesh; 4013 - Catalyst discharge port; 4014 - Catalyst outlet.

[0033] 5-Support frame platform; 6-Exhaust main pipe;

[0034] 701-Three-stage variable frequency speed control motor; 702-Screw drum; 703-Discharge screw; 704-Three-stage solid product inlet; 705-Three-stage solid product outlet; 706-Three-stage variable frequency speed control motor support frame; 707-Cooling jacket; 708-Cooling water outlet; 709-Cooling water inlet; 7010-Three-stage screw discharge device support frame; 8-Superheated gas distribution pipe; 9-Superheated gas main pipe. Detailed Implementation

[0035] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0036] Certain terms are used in this specification and the following claims to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and the following claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout this specification and the following claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0037] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and "about", or "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] See Figure 1-3An embodiment of the present invention provides a pyrolysis catalytic reforming device for waste plastics, comprising: a primary pyrolysis module A for main pyrolysis, a secondary pyrolysis module B for supplementary pyrolysis and preliminary cooling, a solid pyrolysis product cooling module C, and a gaseous pyrolysis product catalytic reforming module D, arranged sequentially from front to back; wherein, the primary pyrolysis module A includes a primary pyrolysis chamber 101 and a primary spiral 102 rotatably disposed within the primary pyrolysis chamber 101, the primary pyrolysis chamber 101 being connected to an air inlet manifold 2. A primary electromagnetic heating mechanism 103 is arranged around the outer side of the primary pyrolysis chamber 101. The primary electromagnetic heating mechanism 103 is used to control the pyrolysis temperature inside the primary pyrolysis chamber 101, which is controlled at 600-700℃. The secondary pyrolysis module B includes a secondary pyrolysis chamber 301 located below the primary pyrolysis chamber 101 and communicating with the end of the primary pyrolysis chamber 101, and a secondary screw rotatably disposed inside the secondary pyrolysis chamber 301. Rotary 302, the secondary pyrolysis module B is connected to the main air intake pipe 2, and a secondary electromagnetic heating mechanism 303 is arranged around the outer periphery of the secondary pyrolysis chamber 301. The secondary electromagnetic heating mechanism 303 is used to control the pyrolysis temperature inside the secondary pyrolysis chamber 301. The pyrolysis temperature inside the secondary pyrolysis chamber 301 is controlled at 500-600℃. The purpose of setting 500-600℃ is to further pyrolyze the solid pyrolysis products of the primary pyrolysis module A and to perform primary cooling; the solid pyrolysis product cooling module C The module is located below the secondary pyrolysis chamber 301 and is connected to the end of the secondary pyrolysis chamber 301; the gaseous pyrolysis product catalytic reforming module D includes a catalytic reforming furnace upper chamber 401, which is connected to the main air inlet pipe 2 through several air inlet distribution pipes 402; the primary pyrolysis module A, the secondary pyrolysis module B, the solid pyrolysis product cooling module C, and the gaseous pyrolysis product catalytic reforming module D are all mounted on the support frame platform 5, which is located on the ground.

[0039] The pyrolysis temperature in the primary pyrolysis chamber 101 is controlled at 600-700℃, the pyrolysis temperature in the secondary pyrolysis chamber 301 is controlled at 500-600℃, and the upper chamber 401 of the catalytic reforming furnace is in a working environment of 500-600℃.

[0040] In this embodiment, a feeding hopper 104 is provided on the upper front side of the primary pyrolysis chamber 101, which is connected to the silo. A nitrogen filling pipe 105 is provided on the lower front side, which is connected to a nitrogen source. A primary solid pyrolysis product outlet 106 is provided on the lower rear side of the primary pyrolysis chamber 101, which is used to discharge the solid products after the main pyrolysis of waste plastics. Specifically, the primary pyrolysis chamber 101 has a cylindrical structure and is horizontally arranged in the front-to-back direction. The primary pyrolysis chamber 101 is mounted on the support frame platform 5 through a primary pyrolysis chamber support frame 1010. The feeding hopper 104 is provided on the upper front side of the primary pyrolysis chamber 101, which is connected to the silo. During operation, waste plastics are stored in the silo and continuously enter the pyrolysis catalytic reforming device through the feeding hopper 104. A nitrogen filling pipe 105 is provided on the lower front end of the primary pyrolysis chamber 101, and the nitrogen filling pipe 105 is connected to a nitrogen source. When the pyrolysis catalytic reforming device is working, the nitrogen source is turned on, so that the pyrolysis catalytic reforming device is filled with nitrogen and works in a nitrogen atmosphere.

[0041] The primary spiral 102 is arranged along the axis inside the primary pyrolysis chamber 101 and extends from the front end to the rear end of the primary pyrolysis chamber 101. The function of the primary spiral 102 is to transport waste plastic. The waste plastic enters the primary pyrolysis chamber 101 from the feed hopper 104, is gradually pyrolyzed and transported backward by the primary spiral 102. The solid products after pyrolysis are discharged through the primary solid pyrolysis product outlet 106.

[0042] The primary pyrolysis chamber 101 is provided with a plurality of primary exhaust pipes 107 evenly spaced on its upper side. The number of primary exhaust pipes 107 can be set according to the length of the primary pyrolysis chamber 101. The primary pyrolysis chamber 101 is connected to the main air inlet pipe 2 through the primary exhaust pipes 107. The gas generated by the pyrolysis of waste plastic in the primary pyrolysis chamber 101 flows into the main exhaust pipe 6 through the primary exhaust pipes 107. Both the primary pyrolysis chamber 101 and the primary exhaust pipes 107 are wrapped with thermal insulation material.

[0043] The primary pyrolysis module A also includes a primary variable frequency speed control motor 108. The primary variable frequency speed control motor 108 is mounted on the support platform 5 via a primary variable frequency speed control motor support frame 109, and is located at the front end of the primary pyrolysis chamber 101. The primary variable frequency speed control motor 108 is connected to the primary spiral 102 and is used to drive the primary spiral 102 to rotate. In this application, the side closer to the primary variable frequency speed control motor 108 is called the front, and the side farther from the primary variable frequency speed control motor 108 is called the rear; the side closer to the support platform 5 is called the lower side, and the side farther from the support platform 5 is called the upper side.

[0044] In this embodiment, the secondary pyrolysis chamber 301 is located below the primary pyrolysis chamber 101. It is a cylindrical structure and horizontally arranged along the front-to-back direction. The secondary pyrolysis chamber 301 is mounted on the support platform 5 via a secondary pyrolysis chamber support frame 304. A secondary solid pyrolysis product inlet 305 is provided on the upper front side of the secondary pyrolysis chamber 301, and a secondary solid pyrolysis product outlet 306 is provided on the lower rear side. The solid products after supplementary pyrolysis in the secondary pyrolysis chamber 301 are discharged through the secondary solid pyrolysis product outlet 306. The secondary solid pyrolysis product inlet 305 is connected to the primary solid pyrolysis product outlet 106. Under the action of gravity, the solid products after pyrolysis in the primary pyrolysis chamber 101 enter the secondary pyrolysis chamber 301 through the primary solid pyrolysis product outlet 106 and the secondary solid pyrolysis product inlet 305 for supplementary pyrolysis.

[0045] The secondary spiral 302 in the secondary pyrolysis chamber 301 extends from one end to the other. The secondary spiral 302 is used to transport the solid products after pyrolysis by the primary pyrolysis module. The solid products after pyrolysis by the primary pyrolysis module enter the secondary pyrolysis chamber 301 through the secondary solid pyrolysis product inlet 305, are transported by the secondary spiral 302, and undergo supplementary pyrolysis and primary cooling. The solid products after pyrolysis and cooling are finally discharged from the secondary solid pyrolysis product outlet 306.

[0046] The upper side of the secondary pyrolysis chamber 301 is evenly spaced with a plurality of secondary exhaust pipes 307 that communicate with the main air intake pipe 2. The number of secondary exhaust pipes 307 can be set according to the length of the secondary pyrolysis chamber 301. A one-way valve 308 is provided in each secondary exhaust pipe 307. The one-way valve 308 is used to prevent gas in the primary exhaust pipe 107 from flowing into the secondary pyrolysis chamber 301. Both the secondary pyrolysis chamber 301 and the secondary exhaust pipes 307 are wrapped with thermal insulation material.

[0047] The secondary pyrolysis module B also includes a secondary variable frequency speed control motor 309. The secondary variable frequency speed control motor 309 is mounted on the support frame platform 5 via a secondary variable frequency speed control motor support frame 3010. The secondary variable frequency speed control motor 309 is located at the front end of the secondary pyrolysis chamber 301. The output shaft of the secondary variable frequency speed control motor 309 is connected to the secondary spiral 302. The secondary variable frequency motor is used to drive the secondary spiral 302.

[0048] In this embodiment, the solid pyrolysis product cooling module C includes a three-stage spiral discharge device, a cooling device, and a three-stage variable frequency speed control motor 701. The three-stage spiral discharge device includes a spiral cylinder 702 and a discharge spiral 703. The spiral cylinder 702 is located below the secondary pyrolysis chamber 301. The spiral cylinder 702 is a cylindrical structure and is horizontally arranged in the front-to-back direction. A three-stage solid product inlet 704 is provided on the upper front side of the spiral cylinder 702, and a three-stage solid product outlet 705 is provided on the lower rear side of the spiral cylinder 702. The three-stage solid product inlet 704 is connected to the secondary solid pyrolysis product outlet 306. After supplementary pyrolysis and primary cooling by the secondary pyrolysis module, the solid product enters the solid pyrolysis product cooling module C through the three-stage solid product inlet 704 for cooling. The cooled solid product is discharged through the three-stage solid product outlet 705 and then transported to other processes for subsequent processing.

[0049] The discharge spiral 703 is rotatably disposed on the spiral cylinder 702 along the axis and extends from one end of the spiral cylinder 702 to the other end. The discharge spiral 703 is used to transport the solid product after supplementary pyrolysis and primary cooling by the secondary pyrolysis module, so that it is gradually cooled down and finally discharged from the tertiary solid product discharge port 705.

[0050] The three-stage variable frequency speed control motor 701 is located at the rear end of the screw drum 702 and is mounted on the support frame platform 5 via the three-stage variable frequency speed control motor support frame 706. The output shaft of the three-stage variable frequency speed control motor 701 is connected to the discharge screw 703, and the three-stage variable frequency speed control motor 701 controls the rotational speed of the discharge screw 703.

[0051] The cooling device is used to cool down the three-stage spiral discharge device. The cooling device includes a cooling jacket 707, which is arranged around the outer periphery of the spiral cylinder 702. A sealed cooling cavity is formed between the cooling jacket 707 and the spiral cylinder 702. A cooling water outlet 708 is provided on the lower front end of the cooling jacket 707, and a cooling water inlet 709 is provided on the upper rear end. The cooling jacket 707 is mounted on the support frame platform 5 through the three-stage spiral discharge device support frame 7010.

[0052] In this embodiment, the gaseous pyrolysis product catalytic reforming module D further includes a lower chamber 403 of the catalytic reforming furnace, a primary condenser 404, and a secondary condenser 405. The lower chamber 403 of the catalytic reforming furnace is mounted on the support platform 5 via a catalytic reforming furnace bracket. The upper chamber 401 of the catalytic reforming furnace is located on the upper surface of the lower chamber 403. The upper chamber 401 of the catalytic reforming furnace is connected to the primary condenser 404, and the primary condenser 404 is connected to the secondary condenser 405. Both the upper chamber 401 and the lower chamber 403 of the catalytic reforming furnace are completely sealed and isolated from each other.

[0053] Furthermore, a plurality of catalytic reforming furnace observation holes 406 are provided on one side of the upper cavity 401 of the catalytic reforming furnace, and rectangular manual operation ports 407 are provided at the rear end of the upper cavity 401 of the catalytic reforming furnace and the rear end of the lower cavity 403 of the catalytic reforming furnace.

[0054] Furthermore, a plurality of exhaust pipes 408 are provided on the upper side of the upper cavity 401 of the catalytic reformer, and the upper cavity 401 of the catalytic reformer and the exhaust pipes 408 are connected by a flexible connection 409; the other end of the exhaust pipe 408 is connected to the exhaust manifold 6, the exhaust manifold 6 is connected to the condenser inlet pipe 4010, the other end of the condenser inlet pipe 4010 is connected to the primary condenser 404, and the primary condenser 404 is connected to the secondary condenser 405; The lower chamber 403 of the catalytic reforming furnace is connected to four superheated gas distribution pipes 8, which are connected to the superheated gas main pipe 9. The superheated gas in the four superheated gas distribution pipes 8 is transported by the superheated gas main pipe 9, and the other end of the superheated gas main pipe 9 is connected to a heat source. The superheated gas main pipe 9 introduces the superheated gas into the lower chamber 403 of the catalytic reforming furnace through the superheated gas distribution pipes 8, and the lower chamber 403 of the catalytic reforming furnace heats the upper chamber 401 of the catalytic reforming furnace.

[0055] The main intake pipe 2, the intake distribution pipe 402, the upper cavity of the catalytic reformer 401, the lower cavity of the catalytic reformer 403, the superheated gas main pipe 9, the superheated gas distribution pipe 8, the exhaust main pipe 6, and the condenser intake pipe 4010 are all wrapped with thermal insulation material.

[0056] In this embodiment, the lower chamber 403 of the catalytic reforming furnace is connected to the superheated gas main pipe 9. An inclined vibration motor 4011 is installed on the outer side of the upper chamber 401 of the catalytic reforming furnace. The upper chamber 401 is connected to the main intake pipe 2 via several intake distribution pipes 402. The front end of the main intake pipe 2 is connected to the primary exhaust pipe 107 and the secondary exhaust pipe 307, used to collect gaseous products from the primary and secondary pyrolysis modules. The rear end of the main intake pipe 2 is connected to three intake distribution pipes 402, used to disperse the collected gaseous products. Each of the three intake distribution pipes 402 is connected at one end to the main intake pipe 2 and at the other end to the upper chamber 401 of the catalytic reforming furnace. The three intake distribution pipes 402 are evenly spaced on one side of the upper chamber 401 of the catalytic reforming furnace to facilitate more thorough catalytic reforming of the gaseous products.

[0057] In this embodiment, a catalyst spreading mesh 4012 is provided inside the upper cavity 401 of the catalyst reforming furnace. The catalyst spreading mesh 4012 is positioned above the gas inlet distribution pipe 402. The pores of the catalyst spreading mesh 4012 are designed to be rectangular. The catalyst spreading mesh 4012 extends from the front end to the rear end of the upper cavity 401 of the catalyst reforming furnace, dividing the upper cavity 401 of the catalyst reforming furnace into two equal upper and lower cavities. Granulated catalyst is placed on the catalyst spreading mesh 4012 to facilitate the catalytic reforming of gaseous products in the primary and secondary pyrolysis modules. In this embodiment, the pore size of the catalyst spreading mesh 4012 is much smaller than the particle size of the granulated catalyst, and the rectangular pore design of the catalyst spreading mesh 4012 can effectively reduce the degree of clogging.

[0058] In this embodiment, a catalyst discharge port 4013 is provided on one side of the front end of the upper cavity 401 of the catalytic reforming furnace, and a catalyst outlet 4014 is provided on the lower rear end. The operator puts the granulated catalyst into the catalyst discharge port 4013, and spreads it on the catalyst flat mesh 4012 under the vibration drive of the inclined vibration motor 4011. The catalyst can be discharged from the catalyst outlet 4014. Furthermore, a number of catalytic reforming furnace observation holes 406 are provided on one side of the upper cavity 401 of the catalytic reforming furnace for observing the internal condition of the upper cavity 401 of the catalytic reforming furnace.

[0059] Another embodiment of the present invention provides a method for preparing a catalyst, wherein the prepared catalyst is applied to the aforementioned pyrolysis catalytic reforming device, and the preparation method includes the following steps:

[0060] Step 1: Weigh 10g of montmorillonite and add it to 200ml of deionized water. Disperse it under strong stirring to form dispersion E.

[0061] Step 2: Add 20g of tetraethyl orthosilicate and 100ml of template agent octadecyltrimethylammonium chloride to 200ml of cumene solution to prepare solution F;

[0062] Step 3: Add solution F to dispersion E, add ammonia to adjust pH to 10, stir for 3-5 hours, filter, wash, dry, and finally calcine at 300 degrees for 3-5 hours to obtain SiO2 modified support material;

[0063] Step 4: Prepare 100 ml of copper nitrate solution and 100 ml of nickel nitrate solution, add SiO2 modified support material to coat the surface of the SiO2 modified support material, impregnate for 5-10 h, dry at 100℃ for 4 h, and then calcine at 300-500℃ for 2-5 h to obtain the supported copper and nickel catalyst; wherein the density of the copper nitrate solution and the density of the nickel nitrate solution are both 5 g / L-20 g / L;

[0064] Step 5: After calcining the catalyst prepared in step 4, the catalyst is granulated into spherical shapes.

[0065] In one embodiment, following the preparation steps described above, with other conditions remaining unchanged, 100 ml of copper nitrate solution (5 g / L) and 100 ml of nickel nitrate solution (5 g / L) were prepared, and SiO2-modified support material was added to obtain supported copper and nickel catalyst a.

[0066] In one embodiment, following the preparation steps described above, with other conditions remaining unchanged, 100 ml of copper nitrate solution (10 g / L) and 100 ml of nickel nitrate solution (10 g / L) were prepared, and SiO2-modified support material was added to obtain catalyst b.

[0067] In one embodiment, following the preparation steps described above, with other conditions remaining unchanged, 100 ml of copper nitrate solution (15 g / L) and 100 ml of nickel nitrate solution (15 g / L) were prepared, and SiO2-modified support material was added to obtain catalyst c.

[0068] In one embodiment, following the preparation steps described above, with other conditions remaining unchanged, 100 ml of copper nitrate solution (20 g / L) and 100 ml of nickel nitrate solution (20 g / L) were prepared, and SiO2-modified support material was added to obtain catalyst d.

[0069] Specifically, the specific working process of the pyrolysis catalytic reforming device is as follows:

[0070] (I) Preparations before equipment startup include: starting the primary variable frequency speed control motor 108, the secondary variable frequency speed control motor 309, and the tertiary variable frequency speed control motor 701. Open the nitrogen charging pipe 105 to ensure the primary pyrolysis module operates under a nitrogen atmosphere. Open the primary electromagnetic heating mechanism 103, the secondary electromagnetic heating mechanism 303, the superheated gas main pipe 9 in the gaseous pyrolysis product catalytic reforming module, and the solid pyrolysis product cooling module to ensure the primary pyrolysis chamber 101 operates at a temperature of 600-700℃, the secondary pyrolysis chamber 301 operates at a temperature of 500-600℃, the upper chamber 401 of the catalytic reforming furnace operates at a temperature of 500-600℃, and the solid pyrolysis product cooling module circulates cooling water. In addition, the primary exhaust pipe 107, primary pyrolysis chamber 101, secondary exhaust pipe 307, secondary pyrolysis chamber 301, intake manifold 2, intake distribution pipe 402, gaseous pyrolysis product catalytic reforming module, superheated gas manifold 9, superheated gas distribution pipe 8, exhaust pipe, exhaust manifold and condenser intake pipe 4010 are all wrapped with heat insulation material to reduce heat loss and save energy.

[0071] (II) Pre-collected and dried waste polypropylene plastic is stored in a silo. The waste polypropylene plastic flows from the storage silo into the feed silo 104. At this time, under a nitrogen atmosphere, the first-stage variable frequency speed control motor 108 drives the first-stage screw 102 to rotate, realizing the conveying of waste polypropylene plastic. The temperature in the first-stage pyrolysis chamber 101 is between 600-700℃. Under the action of high temperature, the chemical bonds of the waste polypropylene plastic break, and the macromolecules become small molecules, generating gaseous products and solid products. The gaseous products enter the main air inlet 2 through the first-stage exhaust pipe 107. The solid products, under the continuous action of the first-stage screw 102, enter the second-stage pyrolysis chamber through the first-stage solid pyrolysis product outlet 106 and the second-stage solid pyrolysis product inlet 305. In the secondary pyrolysis chamber 301 of the pyrolysis module, the secondary electromagnetic heating mechanism 303 has been activated in advance, and the temperature inside the secondary pyrolysis chamber 301 is maintained between 500-600℃. Under the control of the secondary variable frequency speed control motor 309, the secondary spiral 302 continuously conveys the solid products forward. During the conveying process, some of the solid products that were not pyrolyzed in the primary pyrolysis module A continue to undergo pyrolysis. The gaseous products generated by pyrolysis enter the main air inlet pipe 2 through the secondary exhaust pipe 307. After two stages of pyrolysis in the primary and secondary pyrolysis modules, the waste polypropylene plastic has been completely pyrolyzed. The temperature of the secondary pyrolysis module is lower than that of the primary pyrolysis module, which is intended to supplement the pyrolysis and cool down the solid products. Solid products enter the three-stage spiral discharge device in the solid pyrolysis product cooling module through the secondary solid pyrolysis product discharge port 306 and the tertiary solid product inlet 704. The cooling device in the solid pyrolysis product recovery device cools the solid products with cooling water. Under the action of the three-stage variable frequency speed control motor 701, the discharge spiral 703 continuously transports the solid products to the tertiary solid product discharge port.

[0072] The gaseous products after pyrolysis enter the intake manifold 2 through the primary exhaust pipe 107 and the secondary exhaust pipe 307. The intake manifold 2 then diverts the gaseous products to the intake distribution pipe 402. One end of the intake distribution pipe 402 is connected to the intake manifold 2, and the other end is connected to the upper cavity 401 of the catalytic reformer. At this time, the upper cavity 401 of the catalytic reformer is in a working environment of 500-600℃.

[0073] (iv) Start the tilting vibration motor 4011, and spread the pre-prepared granulated catalyst on the catalyst spreading net 4012 through the catalyst discharge port 4013. The catalyst is continuously conveyed forward by vibration from the catalyst discharge port 4013, and the catalyst is continuously replenished until the catalyst covers the entire catalyst spreading net 4012. The catalyst can be spread manually through the rectangular manual operation port 407. After the catalyst is spread, seal the catalyst discharge port 4013 and turn off the tilting vibration motor 4011.

[0074] (V) The gaseous products flowing into the upper chamber 401 of the catalytic reformer through the inlet distribution pipe 402 flow upwards through the catalyst spread on the catalyst spreading mesh 4012. The prepared catalysts a, b, c, and d are tested sequentially to complete the catalytic reforming of the gaseous products. After reforming, oil samples are collected in the condenser, and the catalyst with the highest collection rate is selected for subsequent optimization. The reformed gaseous products enter the primary condenser 404 and secondary condenser 405 through the exhaust pipe 408, exhaust manifold, and condenser inlet pipe 4010 to complete the oil collection. Before the catalytic reforming process, the catalyst is pre-spread, and the catalyst discharge port 4013 and catalyst outlet 4014 are completely sealed. To prevent superheated gas from flowing into the upper chamber 401 of the catalytic reformer, the upper chamber 401 and lower chamber 403 of the catalytic reformer are completely isolated and sealed. Furthermore, the rectangle of the catalyst spreading mesh 4012 is much smaller than the catalyst particle size. The mesh is designed with rectangular holes, which can effectively reduce the degree of clogging.

[0075] After the catalytic reforming of the gaseous product is completed, all equipment is turned off, and then the tilting vibration motor 4011 is started to operate. The used catalyst is discharged from the catalyst outlet 4014 by the tilting vibration of the tilting vibration motor 4011.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A pyrolysis catalytic reforming device for waste plastics, characterized in that: include: The modules arranged from front to back are: a primary pyrolysis module, a secondary pyrolysis module, a solid pyrolysis product cooling module, and a gaseous pyrolysis product catalytic modification module. The primary pyrolysis module includes a primary pyrolysis chamber and a primary spiral rotatably disposed within the primary pyrolysis chamber. The primary pyrolysis chamber is connected to the main air intake pipe, and a primary electromagnetic heating mechanism is arranged around the outside of the primary pyrolysis chamber. The secondary pyrolysis module includes a secondary pyrolysis chamber located below the primary pyrolysis chamber and connected to the end of the primary pyrolysis chamber, and a secondary spiral rotatably disposed within the secondary pyrolysis chamber. The secondary pyrolysis module is connected to the main air intake pipe, and a secondary electromagnetic heating mechanism is arranged around the outer periphery of the secondary pyrolysis chamber. The solid pyrolysis product cooling module is located below the secondary pyrolysis chamber and is connected to the end of the secondary pyrolysis chamber; the gaseous pyrolysis product catalytic reforming module includes an upper chamber of a catalytic reforming furnace, which is connected to the main air inlet pipe through several air inlet distribution pipes. The primary pyrolysis module, the secondary pyrolysis module, the solid pyrolysis product cooling module, and the gaseous pyrolysis product catalytic modification module are all mounted on the support frame platform, which is located on the ground.

2. The pyrolysis catalytic reforming device for waste plastics according to claim 1, characterized in that: A feed hopper is provided on the upper front side of the primary pyrolysis chamber, which is connected to the silo. A nitrogen filling pipe is provided on the lower front side, which is connected to a nitrogen source. A primary solid pyrolysis product outlet is provided on the lower rear side of the primary pyrolysis chamber.

3. The pyrolysis catalytic reforming device for waste plastics according to claim 2, characterized in that: The primary spiral is arranged along the axis inside the primary pyrolysis chamber and extends from the front end to the rear end of the primary pyrolysis chamber. Waste plastic enters the primary pyrolysis chamber from the feed hopper, is gradually pyrolyzed and conveyed backward by the primary spiral, and the solid products after pyrolysis are discharged through the primary solid pyrolysis product outlet.

4. The pyrolysis catalytic reforming device for waste plastics according to claim 3, characterized in that: The upper side of the primary pyrolysis chamber is provided with several primary exhaust pipes at even intervals. The primary pyrolysis chamber is connected to the main air inlet pipe through the primary exhaust pipes. The gas generated by the pyrolysis of waste plastic in the primary pyrolysis chamber is fed into the main exhaust pipe through the primary exhaust pipes. The primary pyrolysis module also includes a primary variable frequency speed control motor, which is located at the front end of the primary pyrolysis chamber. The primary variable frequency speed control motor is connected to the primary spiral and is used to drive the primary spiral to rotate.

5. The pyrolysis catalytic reforming device for waste plastics according to claim 3, characterized in that: The upper front side of the secondary pyrolysis chamber is provided with a secondary solid pyrolysis product inlet, and the lower rear side is provided with a secondary solid pyrolysis product outlet. The secondary solid pyrolysis product inlet is connected to the primary solid pyrolysis product outlet. The solid products pyrolyzed in the primary pyrolysis chamber enter the secondary pyrolysis chamber for supplementary pyrolysis under the action of gravity through the primary solid pyrolysis product outlet and the secondary solid product inlet.

6. The pyrolysis catalytic reforming device for waste plastics according to claim 5, characterized in that: The secondary spiral in the secondary pyrolysis chamber extends from one end to the other. The solid product after pyrolysis by the primary pyrolysis module enters the secondary pyrolysis chamber through the secondary solid pyrolysis product inlet. It is then conveyed by the secondary spiral and gradually undergoes supplementary pyrolysis and primary cooling. The solid product after pyrolysis and cooling is finally discharged from the secondary solid pyrolysis product outlet.

7. The pyrolysis catalytic reforming device for waste plastics according to claim 5, characterized in that: The upper side of the secondary pyrolysis chamber is provided with a number of secondary exhaust pipes that are connected to the main air inlet pipe at even intervals, and a one-way valve is provided in the secondary exhaust pipe. The secondary pyrolysis module also includes a secondary variable frequency speed control motor, which is located at the front end of the secondary pyrolysis chamber. The output shaft of the secondary variable frequency speed control motor is connected to the secondary spiral, and the secondary variable frequency motor is used to drive the secondary spiral.

8. The pyrolysis catalytic reforming device for waste plastics according to claim 1, characterized in that: The solid pyrolysis product cooling module includes a three-stage spiral discharge device, a cooling device, and a three-stage variable frequency speed control motor. The three-stage spiral discharge device includes a spiral cylinder and a discharge spiral. The spiral cylinder is located below the secondary pyrolysis chamber and has a cylindrical structure that is horizontally arranged along the front-to-back direction. The discharge screw is rotatably mounted on the screw cylinder along the axis and extends from one end of the screw cylinder to the other end. The three-stage variable frequency speed control motor is located at the rear end of the screw cylinder. The output shaft of the three-stage variable frequency speed control motor is connected to the discharge screw, and the three-stage variable frequency speed control motor controls the rotational speed of the discharge screw. The cooling device is used to cool down the three-stage screw discharge device. The cooling device includes a cooling jacket, which is arranged around the outer periphery of the screw cylinder, and a sealed cooling cavity is formed between the cooling jacket and the screw cylinder.

9. The pyrolysis catalytic reforming device for waste plastics according to claim 1, characterized in that: The gaseous pyrolysis product catalytic reforming module further includes a lower chamber of the catalytic reforming furnace, a primary condenser, and a secondary condenser. The upper chamber of the catalytic reforming furnace is located on the upper surface of the lower chamber of the catalytic reforming furnace. The upper chamber of the catalytic reforming furnace is connected to the primary condenser, and the primary condenser is connected to the secondary condenser. Both the upper chamber and the lower chamber of the catalytic reforming furnace are completely sealed and isolated from each other.

10. The pyrolysis catalytic reforming device for waste plastics according to claim 1, characterized in that: The lower chamber of the catalytic reforming furnace is connected to the superheated gas main pipe. An inclined vibration motor is installed on the outside of the upper chamber of the catalytic reforming furnace. The upper chamber of the catalytic reforming furnace is connected to the main gas inlet pipe through several gas inlet distribution pipes. A catalyst flat-laying mesh is installed in the upper chamber of the catalytic reforming furnace, and the catalyst flat-laying mesh is positioned above the gas inlet distribution pipes.

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