Solid-liquid-gas separation and purification equipment and solid-liquid-gas separation and purification method

Abstract

The invention discloses solid-liquid-gas separation and purification equipment and a solid-liquid-gas separation and purification method, and belongs to the technical field of solid-liquid-gas separation and purification of waste high polymer pyrolysis high-temperature flue gas. The gas-solid-liquid separation tower comprises a tower body, a plurality of inertial dust removal areas, a plurality of through-flow tower trays and a plurality of mass transfer tower internals; the tower body is provided with a high-temperature flue gas inlet, a pyrolytic oil outlet, a purified gas-liquid outlet, a purified gas-liquid circulating inlet and a mixed liquid outlet; the plurality of inertial dust removal areas are arranged in the separation chamber, are positioned above the high-temperature flue gas inlet and are provided with a plurality of herringbone baffles; the plurality of through-flow trays are positioned above the inertial dust removal area and are provided with a plurality of guide holes; the plurality of mass transfer tower internals are positioned above the cross-flow tower tray and below the purified gas-liquid circulating inlet, and are provided with a plurality of tower internals holes. The device is applied to separation and purification of waste high polymer pyrolysis high-temperature flue gas, and effective separation, purification and condensation treatment of gas, solid and liquid in the high-temperature pyrolysis flue gas with complex components are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of solid-liquid-gas separation and purification of high-temperature flue gas from pyrolysis of waste polymers, and in particular relates to solid-liquid-gas separation and purification equipment and a solid-liquid-gas separation and purification method. Background Art

[0002] Pyrolysis treatment of waste polymers (waste tires, waste plastics and other polymers) is an effective recycling treatment method. It converts waste polymers into pyrolysis oil, carbon slag, coarse carbon black, and non-condensable gas through high-temperature thermal cracking. Among them, pyrolysis oil can be used as fuel oil, and the composition of pyrolysis flue gas is complex, mainly including carbon monoxide, carbon dioxide, sulfur dioxide, coarse carbon black, nitrogen oxides, methane, etc. and some toxic organic matter such as dioxins. These components pose a certain hazard to the environment and human health. Harmful substances in pyrolysis flue gas may also enter the ecosystem through atmospheric deposition, water pollution and other channels, causing harm to plants, animals and other organisms, and destroying the ecological balance. Therefore, it is of great significance to purify the high-temperature flue gas from the pyrolysis of waste polymers.

[0003] A large amount of solid dust is mixed in the high-temperature flue gas from pyrolysis, and it is impossible to effectively separate and purify solids, liquids and gases during the condensation process, resulting in a large amount of fine solid particles entrained in the pyrolysis oil and non-condensable gas, which cannot be effectively treated, making the oil turbid and of poor quality. At the same time, it causes blockage of process pipelines and condensation equipment, which cannot stabilize production and operation, and forms new environmental pollution. Specifically, during the condensation process, since the solid dust particles entrained in the pyrolysis flue gas are small and have a certain degree of adhesion, they are easily condensed in the oil products and deposited on the surface of equipment such as condensers and pipelines, forming blockages. These blockages will not only affect the normal operation of the equipment and reduce the condensation efficiency, but also increase the maintenance cost and energy consumption of the equipment. Equipment blockage will lead to incomplete condensation, and some oil and gas cannot be effectively condensed into liquid oil, thereby affecting the yield and quality of the oil products. The oil products may contain more impurities and uncondensed gases, resulting in substandard performance indicators such as flash point, viscosity, and sulfur content of the oil products. At the same time, the deposition of solid dust in the condenser may also contaminate solid products such as carbon black, reducing their purity and utilization value, resulting in poor product quality. Summary of the invention

[0004] The details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent.

[0005] The present invention provides a solid-liquid-gas separation and purification device and a solid-liquid-gas separation and purification method, which realizes the effective separation and purification of gas, solid and liquid in high-temperature pyrolysis flue gas with complex components and condensation treatment.

[0006] The present invention discloses a solid-liquid-gas separation purification device for solid-liquid-gas separation of high-temperature flue gas from pyrolysis of waste polymers, comprising a gas-solid-liquid separation tower; the gas-solid-liquid separation tower further comprises: a tower body, a plurality of inertial dust removal zones, a plurality of flow-through tower plates, and a plurality of mass transfer tower internals; the tower body forms a separation chamber for solid-liquid-gas separation, and has a high-temperature flue gas inlet, a pyrolysis oil outlet, a purified gas-liquid outlet, a purified gas-liquid circulation inlet, and a mixed liquid outlet; the purified gas-liquid outlet is opened at the top of the tower body, and the mixed liquid outlet is opened at the bottom of the tower body; the plurality of inertial dust removal zones It is arranged in the separation chamber, above the high-temperature flue gas inlet, and arranged along the axial direction of the tower body; the inertial dust removal area is provided with a plurality of herringbone baffles; a plurality of flow trays are arranged in the separation chamber, above the inertial dust removal area, and arranged along the axial direction of the tower body; the flow trays are provided with a plurality of guide holes; a plurality of mass transfer tower internals are arranged in the separation chamber, above the flow trays, and below the purified gas-liquid circulation inlet, and arranged along the axial direction of the tower body; a plurality of tower internal openings are provided on the mass transfer tower internals; the opening diameter and number of the tower internal openings are determined by the following formula:

[0007]

[0008] In the above formula, E i,MV : The efficiency of the i-th gas phase Murfree plate %; E OG : gas phase efficiency %; G: gas phase mass flow rate kg / h; B: average liquid sulfur width of the tower plate m; L: liquid phase mass flow rate kg / h; e: natural constant (2.71828); ε: sieve plate opening ratio m 2 / m 2 ;D AB : Inner diameter of tray m; C AS : Gas phase flow coefficient %; C AO : Liquid phase flow coefficient %; θ C : Rotation angle °.

[0009] In some of the embodiments, the inertial dust removal zone, the flow-through trays and the mass transfer tower internals are all orthogonal to the axis of the tower body.

[0010] In some of the embodiments, the circumference of the inertial dust removal zone is against the inner wall of the tower body; the circumference of the flow tower plate is against the inner wall of the tower body; the mass transfer tower internals include a free end and a connecting end against the inner wall of the tower body; the free ends of adjacent mass transfer tower internals are arranged in an alternating manner.

[0011] In some of the embodiments, the solid-liquid-gas separation purification equipment also includes a first circulation component connected between the purified gas-liquid outlet and the purified gas-liquid circulation inlet; the first circulation component includes a first condenser, a top reflux tank, and a top reflux pump arranged in sequence along the flow direction of the purified gas and liquid.

[0012] In some of the embodiments, the tower body further has a mixed liquid circulation inlet, which is opened on the side wall of the tower body between the inertial dust removal zone and the flow-through tower tray and is located above the inertial dust removal zone.

[0013] In some embodiments, the solid-liquid-gas separation purification equipment also includes a second circulation component connected between the mixed liquid outlet and the mixed liquid circulation inlet; the second circulation component includes a bottom separation tank and a slurry pump arranged in sequence along the flow direction of the mixed liquid.

[0014] In some embodiments, the pyrolysis oil outlet is opened on the side wall of the tower body above the mass transfer tower internals.

[0015] In some of the embodiments, the solid-liquid-gas separation and purification equipment further includes a pyrolysis oil output component connected to the pyrolysis oil outlet; the pyrolysis oil output component includes a second condenser and a finished oil storage tank.

[0016] On the other hand, the present invention provides a method for solid-liquid-gas separation and purification by a solid-liquid-gas separation and purification device according to any of the above-mentioned technical solutions, comprising: high-temperature flue gas from pyrolysis of waste polymers enters a separation chamber from a high-temperature flue gas inlet and is transferred from bottom to top; first passes through an inertial dust removal area, and under the action of a herringbone baffle, solid particles with a size of more than 20 um in the high-temperature flue gas from pyrolysis of waste polymers are removed; then flows through a flow tower plate, and the gas passing through the guide holes pushes the liquid to flow evenly on the tower plate; and then passes through the opening of the tower internals and through the mass transfer tower internals to reduce the bubble diameter of the gas and liquid.

[0017] In some of the embodiments, it also includes: the fine solid dust particles separated by the gas-solid-liquid separation tower flow out of the tower body through the mixed liquid outlet, the clean oil and gas rise to the top of the tower, the normal pyrolysis oil is produced through the pyrolysis oil outlet in the middle of the tower, and the clean light pyrolysis oil and clean non-condensable gas are produced through the purified gas-liquid outlet at the top of the tower.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention proposes a solid-liquid-gas separation and purification device, which is based on the ultrafine particle inertial capture coupled with Brownian diffusion capture theory, coupled with flow guide rectification and tower internals technology, and innovates the structure of the tower separator, which realizes efficient distillation and greatly improves the washing effect of the liquid phase on the solid particles in the bubbles, especially on the ultrafine particles. When working, a variety of tower internals are organically combined to make the best use of their strengths and avoid their weaknesses, and realize orderly coupling of layers, and finally realize the thorough removal of micron and submicron dust.

[0020] The present invention provides a solid-liquid-gas separation and purification method, wherein the tower plate design efficiency is increased from 70-80% to more than 90%, the separation efficiency of ultrafine particles is increased from 90-95% to more than 99.99%, and the operating flexibility is increased from 60-150% to 50-200%, an increase of 16.7-50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of a gas-solid-liquid separation tower provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a solid-liquid-gas separation and purification device provided in an embodiment of the present invention;

[0024] Figure 3 A partial cross-sectional schematic diagram of an inertial dust removal area provided in an embodiment of the present invention;

[0025] Figure 4 A partial cross-sectional schematic diagram of a flow-through tray provided in an embodiment of the present invention;

[0026] Figure 5 A partial cross-sectional schematic diagram of the mass transfer tower internals provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of mass transfer and separation of gas and liquid at a herringbone baffle in an inertial dust removal zone provided by an embodiment of the present invention;

[0028] Description of the drawings: 10, gas-solid-liquid separation tower; 101, tower body; 1011, high-temperature flue gas inlet; 1012, pyrolysis oil outlet; 1013, purified gas-liquid outlet; 1014, purified gas-liquid circulation inlet; 1015, mixed liquid outlet; 1016, mixed liquid circulation inlet; 102, inertial dust removal area; 1021, herringbone baffle; 103, flow tray; 1031, guide hole; 104, mass transfer tower internals; 1041, opening; 201, first condenser; 202, tower top reflux tank; 203, tower top reflux pump; 301, tower bottom separation tank; 302, slurry pump; 401, second condenser; 402, finished oil storage tank. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0030] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0031] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present invention may be combined with other embodiments without conflict.

[0032] Unless otherwise defined, the technical terms or scientific terms involved in the present invention shall have the usual meanings understood by persons with ordinary skills in the technical field to which the present invention belongs. The words "one", "a", "a", "the" and the like involved in the present invention do not indicate a quantity limitation and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in the present invention are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in the present invention refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" may indicate: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects in the front and back relation are in an "or" relationship. The terms "first", "second", etc. involved in the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0033] The embodiment of the present invention provides a solid-liquid-gas separation and purification device, which is used for solid-liquid-gas separation of high-temperature flue gas from pyrolysis of waste polymers, and includes a gas-solid-liquid separation tower 10; Figure 1 As shown, the gas-solid-liquid separation tower 10 further includes: a tower body 101, a plurality of inertial dust removal zones 102, a plurality of flow-through trays 103, and a plurality of mass transfer tower internals 104; the tower body 101 encloses a separation chamber for solid-liquid-gas separation, and has a high-temperature flue gas inlet 1011, a pyrolysis oil outlet 1012, a purified gas-liquid outlet 1013, a purified gas-liquid circulation inlet 1014, and a mixed liquid outlet 1015; the purified gas-liquid outlet 1013 is opened at the top of the tower body 101, and the mixed liquid outlet 1015 is opened at the bottom of the tower body 101; a plurality of inertial dust removal zones 102 are arranged in the separation chamber, and are located above the high-temperature flue gas inlet 1011, and are arranged along the axial direction of the tower body 101; as shown Figure 3 As shown, the inertial dust removal zone 102 is provided with a plurality of herringbone baffles 1021; a plurality of flow trays 103 are provided in the separation chamber and are located above the inertial dust removal zone 102 and arranged along the axis direction of the tower body 101; Figure 4 As shown, the flow tray 103 is provided with a plurality of guide holes 1031; a plurality of mass transfer tower internals 104 are arranged in the separation chamber, and are located above the flow tray 103, and below the purified gas-liquid circulation inlet 1014, and are arranged along the axial direction of the tower body 101; Figure 5As shown, a plurality of tower internal openings 1041 are provided on the mass transfer tower internal 104; the diameter and number of the tower internal openings 1041 are determined by the following formula:

[0034]

[0035] In the above formula, E i,MV : The efficiency of the i-th gas phase Murfree plate %; E OG : gas phase efficiency %; G: gas phase mass flow rate kg / h; B: average liquid sulfur width of the tower plate m; L: liquid phase mass flow rate kg / h; e: natural constant (2.71828); ε: sieve plate opening ratio m 2 / m 2 ;D AB : Inner diameter of tray m; C AS : Gas phase flow coefficient %; C AO : Liquid phase flow coefficient %; θ C : Rotation angle °.

[0036] The difficulty in designing a high-efficiency purification tower for pyrolysis flue gas lies in: the separation efficiency requirement is high, which is difficult to achieve using conventional cyclone separation technology; dust particles are easy to clog the equipment, and the equipment is difficult to operate continuously, stably and safely for a long time; the design requirements for the tower internals are high. The above technical scheme provides a solid-liquid-gas separation and purification equipment. The pyrolysis high-temperature flue gas first enters the gas-solid-liquid separation purification tower, which is used to separate the gas from the solid particles in the flue gas. Unlike the general distillation tower, the material entering the gas-solid-liquid separation tower 10 contains solid particles, and liquid is required to bring the solid particles to the bottom of the tower to purify the flue gas. Because the material contains solid particles, the washing tower is prone to clogging. When designing, the separation efficiency should be guaranteed while ensuring sufficient contact between the gas and liquid to remove all the dust carried in the gas phase, and it will not be deposited in the tower to avoid clogging in the tower. The present invention is based on the ultrafine particle inertial capture coupled with Brownian diffusion capture theory, and is coupled with flow diversion rectification and tower internals technology, to innovate the structure of the tower separator, which greatly enhances the washing effect of the liquid phase on the solid particles in the bubbles, especially the ultrafine particles, while achieving efficient distillation. When working, a variety of tower internals are organically combined to maximize their strengths and minimize their weaknesses, achieve orderly layered coupling, and ultimately achieve complete removal of micron and submicron dust.

[0037] The present invention solves the problem of separation and purification of micro-particles in high-temperature flue gas during pyrolysis of waste polymers (waste tires, waste plastics, etc.) and incomplete removal of ultrafine suspended particles in gas and liquid, and provides a gas-solid-liquid separation purification tower with a brand-new process technology, which couples inertial dust removal with guide sieve plates, flow-through tower plates 103, and high-efficiency mass transfer tower internals 104 technologies, improves the gas-liquid separation efficiency, increases operational flexibility (50-200% operational flexibility), and solves the problem of easy clogging of tower internals.

[0038] The high-temperature mixed flue gas from the pyrolysis of waste polymer enters from the bottom of the tower and enters the inertial dust removal area 102, using the herringbone baffle 1021 technology, such as Figure 6 As shown, the coupling technology of inertial collision and wet scrubbing is used to remove most of the particles larger than 20um by taking advantage of the characteristics that large particles in the gas phase have poor followability and are prone to inertial collision. The mixed gas, solid and liquid flow through the multi-layer flow tray 103, and the guide hole 1031 is provided on the sieve plate. The gas passing through the guide hole 1031 pushes the liquid to flow evenly on the tray to overcome the liquid level drop and liquid phase backmixing on the tray, eliminate the flow dead zone, improve the tray efficiency, and prevent the accumulation of solid particles. The production capacity is about 30% higher than that of the traditional tray, the separation efficiency is about 20% higher, the tower pressure is reduced, and the anti-blocking property is good. It is particularly suitable for the distillation of special systems such as high viscosity, easy self-aggregation, and containing solid particles. The function of the high-efficiency mass transfer tower internals 104 is mainly to reduce the bubble diameter of the gas-liquid, increase the mass transfer specific surface area of ​​the liquid layer on the plate, strengthen the gas-liquid mass transfer process, reduce the bubble diameter, and simultaneously increase the contact probability of ultrafine particles with the liquid phase, that is, increase the capture efficiency of ultrafine particles, and achieve a thorough separation and purification of microparticles in the gas, liquid and solid.

[0039] The above technical scheme also defines the design principle of the diameter and number of the openings 1041 of the tower internals, that is, by utilizing the relationship between the bubble diameter and the Murfree plate efficiency, the size and number of the openings 1041 of the high-efficiency mass transfer tower internals 104 are calculated and designed according to different separation requirements through a formula. The size and number of the openings directly affect the mass transfer and separation tower plate efficiency. This formula is derived from the Murfree plate efficiency calculation formula, which can not only meet the design requirements of different separation requirements, but also ensure the separation effect.

[0040] The above technical solution utilizes the concept and structure of the microbubble tray, and arranges internal components on the plate to perform three-dimensional regulation of the gas-liquid micro-interface, forcing the interface to be updated. For the distillation process, the mass transfer process between the gas and liquid on the tray is enhanced, the separation efficiency of the tray is greatly improved, and the investment and operating costs are greatly reduced. For the washing process, the contact probability between the ultrafine particles and the liquid phase is increased, which is conducive to the complete separation of the particles and the liquid phase. In addition, it should be noted that the above technical solution of the present invention also specifically defines that a plurality of inertial dust removal zones 102, a plurality of flow trays 103, and a plurality of mass transfer tower internals 104 are sequentially arranged from bottom to top (which is also the direction of material transfer) in the separation chamber. The reason is that the dust-containing flue gas passes through the inertial dust removal zone in reverse direction, and about 50% of the large particles can be separated by gravity and inertia. The dust-containing flue gas continues to pass through the flow tray, and 40% of the dust particles are removed through gas-liquid mass transfer exchange and washing. Finally, it passes through the mass transfer tower internals and utilizes the microbubble principle to fully carry out gas-liquid mass transfer washing to separate and remove 9.99% of the microparticles, thereby achieving the separation of 99.99% of the particles and microparticles in the flue gas.

[0041] In order to ensure the treatment effect, the inertial dust removal zone 102, the flow tray 103 and the mass transfer tower internals 104 are orthogonal to the axis of the tower body 101. Furthermore, the circumference of the inertial dust removal zone 102 abuts against the inner wall of the tower body 101; the circumference of the flow tray 103 abuts against the inner wall of the tower body 101; the mass transfer tower internals 104 include free ends and connecting ends abutting against the inner wall of the tower body 101; the free ends of adjacent mass transfer tower internals 104 are arranged in a staggered manner. The technical solution specifically defines that the mass transfer tower internals 104 include free ends and connecting ends abutting against the inner wall of the tower body 101, and the free ends of adjacent mass transfer tower internals 104 are arranged in a staggered manner. The reason is that the staggered arrangement realizes the free downward overflow flow of the liquid, while the rising flue gas passes through the tower internals and fully contacts with the liquid to realize the gas-liquid separation of microparticles.

[0042] like Figure 2 As shown, the solid-liquid-gas separation purification equipment also includes a first circulation component connected between the purified gas-liquid outlet 1013 and the purified gas-liquid circulation inlet 1014; the first circulation component includes a first condenser 201, a tower top reflux tank 202, and a tower top reflux pump 203 arranged in sequence along the purified gas-liquid flow direction. By providing the first circulation component, clogging of the tower internals can be effectively avoided.

[0043] In some embodiments, the tower body 101 further has a mixed liquid circulation inlet 1016, which is opened on the side wall of the tower body 101 between the inertial dust removal zone 102 and the flow-through tray 103, and is located above the inertial dust removal zone 102. The technical solution specifically defines that the mixed liquid circulation inlet 1016 is opened on the side wall of the tower body 101 between the inertial dust removal zone 102 and the flow-through tray 103, because the gas-liquid-solid separation with the circulation washing effect is formed.

[0044] Furthermore, in order to avoid clogging of the inertial tower plate, the solid-liquid-gas separation purification equipment also includes a second circulation component connected between the mixed liquid outlet 1015 and the mixed liquid circulation inlet 1016; the second circulation component includes a bottom separation tank 301 and a slurry pump 302 arranged in sequence along the mixed liquid flow direction.

[0045] In some embodiments, the pyrolysis oil outlet 1012 is opened on the side wall of the tower body 101 corresponding to the mass transfer tower internals 104. The technical solution specifically defines that the pyrolysis oil outlet 1012 is opened on the side wall of the tower body 101 corresponding to the mass transfer tower internals 104, because a continuous circulation washing effect of liquid downward and gas upward is formed in the tower internals 104, thereby completing a continuous washing effect.

[0046] In some of the embodiments, the solid-liquid-gas separation and purification equipment further includes a pyrolysis oil output component connected to the pyrolysis oil outlet 1012 ; the pyrolysis oil output component includes a second condenser 401 and a finished oil storage tank 402 .

[0047] On the other hand, the present invention provides a method for solid-liquid-gas separation and purification using a solid-liquid-gas separation and purification device according to any of the above-mentioned technical solutions, comprising: high-temperature flue gas from pyrolysis of waste polymers enters a separation chamber from a high-temperature flue gas inlet 1011 and is transferred from bottom to top; first passes through an inertial dust removal zone 102, and under the action of a herringbone baffle 1021, solid particles with a size of more than 20 um in the high-temperature flue gas from pyrolysis of waste polymers are removed; then flows through a flow tray 103, and the gas passing through a guide hole 1031 pushes the liquid to flow evenly on the tray; and then passes through a mass transfer tower internal 104 through a tower internal opening 1041 to reduce the bubble diameter of the gas-liquid. It further includes: the fine solid dust particles separated by the gas-solid-liquid separation tower 10 flow out of the tower body 101 through the mixed liquid outlet 1015, the clean oil and gas rise to the top of the tower, the normal pyrolysis oil is produced through the pyrolysis oil outlet 1012 in the middle of the tower, and the clean light pyrolysis oil and clean non-condensable gas are produced through the purified gas-liquid outlet 1013 at the top of the tower.

[0048] The above method realizes effective gas-solid-liquid separation, purification and condensation treatment of high-temperature pyrolysis flue gas with complex components, and can produce clean non-condensable gas, clean pyrolysis oil and crude carbon black, and can return the complex residual oil after system treatment to the high-temperature pyrolysis furnace for cyclic re-pyrolysis treatment, which completely solves the problem of environmental pollution. After the complex high-temperature flue gas passes through the gas-solid-liquid separation tower 10, the fine solid dust particles are completely removed and fall into the bottom of the tower, and can be returned to the pyrolysis furnace for cyclic pyrolysis. Clean oil and gas rise to the top of the tower, normal pyrolysis oil can be produced in the middle of the tower, and clean light pyrolysis oil and clean non-condensable gas can be produced at the top of the tower. The non-condensable gas can be returned to the pyrolysis furnace as a heat source. The tower plate design efficiency is increased from 70-80% to more than 90%, the separation efficiency of ultrafine particles is increased from 90-95% to more than 99.99%, and the operating flexibility is increased from 60-150% to 50-200%, an increase of 16.7-50%.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A solid-liquid-gas separation and purification equipment, characterized in that: Used for solid-liquid-gas separation of high-temperature flue gas from pyrolysis of waste polymers, comprising a gas-solid-liquid separation tower; the gas-solid-liquid separation tower further comprises: The tower body forms a separation chamber for solid-liquid-gas separation, and has a high-temperature flue gas inlet, a pyrolysis oil outlet, a purified gas-liquid outlet, a purified gas-liquid circulation inlet, and a mixed liquid outlet; the purified gas-liquid outlet is opened at the top of the tower body, and the mixed liquid outlet is opened at the bottom of the tower body; A plurality of inertial dust removal zones are arranged in the separation chamber, above the high-temperature flue gas inlet, and arranged along the axial direction of the tower body; the inertial dust removal zones are provided with a plurality of herringbone baffles; A plurality of flow trays are arranged in the separation chamber, above the inertial dust removal zone, and arranged along the axial direction of the tower body; the flow trays are provided with a plurality of guide holes; A plurality of mass transfer tower internals are arranged in the separation chamber, above the flow-through tray, below the purified gas-liquid circulation inlet, and arranged along the axial direction of the tower body; a plurality of tower internal openings are opened on the mass transfer tower internals; the opening diameter and number of the tower internal openings are determined by the following formula: In the above formula, E i,MV : The efficiency of the i-th gas phase Murfree plate %; E OG : gas phase efficiency %; G: gas phase mass flow rate kg / h; B: average liquid sulfur width of the tower plate m; L: liquid phase mass flow rate kg / h; e: natural constant (2.71828); ε: sieve plate opening ratio m 2 / m 2 ;D AB : Inner diameter of tray m; C AS : Gas phase flow coefficient %; C AO : Liquid phase flow coefficient %; θ C : Rotation angle °.

2. The solid-liquid-gas separation and purification equipment according to claim 1, characterized in that: The inertial dust removal zone, the flow-through tower tray and the mass transfer tower internals are all orthogonal to the axis of the tower body.

3. The solid-liquid-gas separation and purification equipment according to claim 2, characterized in that: The circumference of the inertial dust removal zone abuts against the inner wall of the tower body; the circumference of the flow-through tower plate abuts against the inner wall of the tower body; the mass transfer tower internals include a free end and a connecting end abutting against the inner wall of the tower body; the free ends of adjacent mass transfer tower internals are arranged in an alternating manner.

4. The solid-liquid-gas separation and purification equipment according to claim 1, characterized in that: The solid-liquid-gas separation purification equipment also includes a first circulation component connected between the purified gas-liquid outlet and the purified gas-liquid circulation inlet; the first circulation component includes a first condenser, a tower top reflux tank, and a tower top reflux pump arranged in sequence along the purified gas-liquid flow direction.

5. The solid-liquid-gas separation and purification equipment according to claim 1, characterized in that: The tower body also has a mixed liquid circulation inlet, which is opened on the side wall of the tower body between the inertial dust removal zone and the flow-through tower plate and is located above the inertial dust removal zone.

6. The solid-liquid-gas separation and purification equipment according to claim 5, characterized in that: The solid-liquid-gas separation and purification equipment also includes a second circulation component connected between the mixed liquid outlet and the mixed liquid circulation inlet; the second circulation component includes a tower bottom separation tank and a slurry pump arranged in sequence along the mixed liquid flow direction.

7. The solid-liquid-gas separation and purification equipment according to claim 1, characterized in that: The pyrolysis oil outlet is opened on the side wall of the tower body corresponding to the mass transfer tower internals.

8. The solid-liquid-gas separation and purification equipment according to claim 7, characterized in that: The solid-liquid-gas separation and purification equipment also includes a pyrolysis oil output component connected to the pyrolysis oil outlet; the pyrolysis oil output component includes a second condenser and a finished oil storage tank.

9. A method for solid-liquid-gas separation and purification using the solid-liquid-gas separation and purification equipment according to any one of claims 1 to 8, characterized in that: include: The high-temperature flue gas from the pyrolysis of waste polymers enters the separation chamber from the high-temperature flue gas inlet and is transferred from bottom to top; first, it passes through the inertial dust removal area, and under the action of the herringbone baffle, solid particles with a size of more than 20um in the high-temperature flue gas from the pyrolysis of waste polymers are removed; then it flows through the through-flow tower plate, and the gas passing through the guide holes pushes the liquid to flow evenly on the tower plate; then it passes through the openings in the tower internals and passes through the mass transfer tower internals to reduce the bubble diameter of the gas and liquid.

10. The solid-liquid-gas separation and purification method according to claim 9, characterized in that: Also includes: The fine solid dust particles separated by the gas-solid-liquid separation tower flow out of the tower through the mixed liquid outlet, and the clean oil and gas rise to the top of the tower. Normal pyrolysis oil is produced through the pyrolysis oil outlet in the middle of the tower, and clean light pyrolysis oil and clean non-condensable gas are produced through the purified gas-liquid outlet at the top of the tower.

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