Magnetic synergic incineration system for high-viscosity alkali-containing organic waste

Abstract

This application relates to the field of waste incineration, particularly a magnetic co-incineration system for high-viscosity alkaline organic waste. It includes a treatment, concentration, drying, and magnetization section; an ultrasonic resonance magnetization device; a reverse magnetic conveying device; and a magnetic alkali incineration section. The incinerator top of the magnetic alkali incineration section is equipped with an auxiliary magnetic field and an ignition burner. The upper part of the furnace is the main combustion zone, and the lower part is an electric fusion pool for the auxiliary combustion zone. From top to bottom, the upper sidewall of the main combustion zone is equipped with a solid waste feed chute, a primary annular tuyer, a waste liquid spray gun, and a secondary annular tuyer. A burnout annular tuyer is located in the middle of the sidewall of the main combustion zone. By further concentrating the concentrated wastewater to a solid state, the overall calorific value of the material is increased, allowing the material itself to reach the designed incineration temperature. Addressing the problem of difficult conveying due to high viscosity, this application magnetizes the material before it enters the magnetic field for conveying. Inside the incinerator, the combined effect of the magnetic field and magnetic combustion-supporting powder extends the incineration time, ensuring complete incineration of the waste.

Description

Technical Field

[0001] This application relates to the field of waste incineration, particularly to a magnetic co-incineration system for high-viscosity, alkaline organic waste. Background Technology

[0002] Existing PTA multi-source waste treatment facilities generally consist of four sub-projects: evaporation and concentration, incinerator, flue gas purification, and desalination. Wastewater first undergoes an evaporation and concentration process to form high-concentration wastewater with a concentration of 50%–60%, which is then transported via liquid phase into an alkaline incinerator for resource recovery. The high-temperature flue gas generated from incineration first enters a waste heat recovery system to recover heat energy and generate steam, and then enters a flue gas purification system for treatment before being discharged in compliance with standards.

[0003] Incinerators are typically equipped with waste liquid spray guns at the top. Concentrated PTA wastewater is sprayed into the furnace for combustion through these guns, and the resulting molten salt slag is discharged through a chute at the bottom of the furnace. Gas burners are installed at the top and sides of the furnace to supply natural gas into the furnace to ensure the combustion temperature, as illustrated in publication number CN115371061B, titled: "High-Concentration Salt-Containing Organic Waste Liquid Incineration Device and Incineration Molten Slag Separation and Recovery Process."

[0004] However, PTA wastewater is an organic, alkaline waste liquid. After concentration, it has high viscosity, poor fluidity, and is prone to salt precipitation and pipe blockage. If the concentration is reduced to address fluidity and blockage issues, the overall calorific value of the waste liquid will be low. To ensure normal combustion and that the temperature meets the requirements of the "Standard for Pollution Control of Hazardous Waste Incineration" (GB18484-2020), a large amount of high-calorific-value combustion aids must be continuously fed into the incinerator, resulting in high consumption and poor economic efficiency. Furthermore, existing incinerator technologies can only treat liquid waste and are inadequate for solid waste. If existing technology is used, solid waste needs to be dissolved into liquid waste for further disposal, consuming even more combustion aids and industrial water. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, this application proposes a magnetic co-incineration system for high-viscosity alkaline organic waste, which can simultaneously treat waste liquid and solid waste generated in PTA production, and the incineration process does not require the addition of additional combustion aids.

[0006] This application proposes a magnetic co-incineration system for high-viscosity alkaline organic waste. The magnetic alkali incineration section 4 of the system includes a cylindrical incinerator. A second auxiliary magnetic field generator 30 and an ignition burner 31 are arranged on the top of the incinerator. The upper part of the incinerator is the main combustion zone 28, and the lower part is the electric melting pool 29, which is the auxiliary combustion zone. The upper part of the side wall of the main combustion zone 28 is provided with a solid waste feed chute 32, a primary annular tuyer 34, a waste liquid spray gun 33, and a secondary annular tuyer 35 arranged sequentially from top to bottom. The tuyer tuyer 34 and the secondary annular tuyer 35 are oriented in a tangential direction. The solid waste feed chute 32 outlet and the waste liquid spray gun 33 outlet are staggered vertically, and a burnout annular air vent 36 is arranged in the middle of the side wall of the main combustion zone 28. The system also includes a concentration, drying and magnetization section 1 for treating organic waste liquid and an ultrasonic resonance magnetization device 2 for treating solid waste. The organic waste liquid is treated by the concentration, drying and magnetization section 1 to obtain viscous magnetic waste. The solid waste is sent to the ultrasonic resonance magnetization device 2 for ultrasonic crushing and mixing with magnetic powder to obtain magnetic waste. The magnetic waste is conveyed to the solid waste feed chute 32 by the reverse magnetic attraction conveyor 3 for incineration.

[0007] Specifically, the concentration, drying, and magnetization section 1 includes an evaporation and concentration device 6 and a drying device 7. After the organic wastewater is concentrated by the evaporation and concentration device 6, X% of the concentrated waste liquid is added to magnetic powder and dried. The remaining concentrated waste liquid is sent to the waste liquid spray gun 33. The formula for calculating X% is:

[0008]

[0009] Specifically, the magnetic powder has a metallic composition of 40-50% iron, 5-10% silver and 1-3% rare metals, and the particle size of the magnetic powder is less than or equal to 50 μm.

[0010] Specifically, a first auxiliary magnetic field generator 20 is provided above the conveyor belt 25 of the reverse magnetic conveying device 3. During the conveying process, the first auxiliary magnetic field generator 20 forms a magnetic attraction force on the magnetic waste to counteract most of the gravity of the magnetic waste itself, and the remaining part forms the friction force required for conveying.

[0011] Specifically, the reverse magnetic conveying device 3 includes a conveyor belt 25, a support frame 27, a drive shaft 22, a driven shaft 23, a conveying roller 24, and an auxiliary roller 26. The motor 21 drives the drive shaft 22 to rotate, which in turn drives the conveyor belt 25. The first auxiliary magnetic field generator 20 is located above the conveyor belt 25. The magnetized solid waste enters the conveyor belt 25 and is conveyed by the conveyor belt 25 to the solid waste feed chute 32.

[0012] Specifically, the ultrasonic resonance magnetization device 2 includes, from top to bottom, a feeding zone 8, a primary filter 11, a crushing and magnetization zone 9, a secondary filter 43, and a discharge zone 10. An ultrasonic generator 15 is arranged on the upper part of the crushing and magnetization zone 9 and on the side wall near the primary filter 11. A magnetic combustion-supporting powder injection pipe 16 is arranged in the middle and lower part of the crushing and magnetization zone 9. The single pipe of the magnetic combustion-supporting powder injection pipe 16 is inclined at 20° to the center in the horizontal direction and inclined at 20° upward from the horizontal plane in the vertical direction.

[0013] Specifically, the ultrasonic resonance magnetization device 2 has an inlet 12 and an outlet bag filter 13 at the top, and an outlet electric valve 14 at the bottom; the solid waste processing capacity is 1-10 t / h, the diameter is 4-20 m, the height is 8-40 m, the primary filter 11 is 5 mesh with a pore size of 4 mm; the secondary filter 43 is 20 mesh with a pore size of 0.85 mm; the ultrasonic generator 15 operates at a frequency of 10000-20000 Hz, and the number of magnetic combustion-supporting powder injection pipes 16 is 6-90 sets.

[0014] Specifically, the electric melting pool 29 is equipped with a discharge baffle 37, a discharge chute 38, an electrode assembly 39, and an oxygen supply port 40. The liquid level of the electric melting pool 29 is controlled at 1-2m. The discharge chute 38 is located at the bottom edge of the electric melting pool 29 as the discharge port for completely incinerated material. The discharge baffle 37 is an immersion baffle located above the discharge chute 38. The immersion depth of the discharge baffle 37 is 2 / 3 of the liquid level depth. The electrode assembly 39 is located in the upper part of the electric melting pool 29 to stabilize the melting pool temperature at 1100-1150℃. The oxygen supply port 40 is located below the liquid level stratification line.

[0015] Specifically, the incineration temperature of the magnetic waste in the main combustion zone 28 is maintained above 1100°C, and the incineration residence time is controlled to be ≥2s by controlling the power of the second auxiliary magnetic field generator 30.

[0016] Specifically, the system also includes an ash separation unit 5, which includes a slag cooling and dissolving device 41, a salt separation pretreatment filtration device 42, and a grinding device. The molten slag produced by the incinerator is sent to the slag cooling and dissolving device 41 to be cooled to 60°C, and then sent to the salt separation pretreatment filtration device 42 to be dissolved in water. The filtered alkaline solution enters the subsequent salt separation device to extract sodium carbonate and sodium bromide. The magnetic combustion-supporting powder retained by the filter is sent to the grinding device, and after grinding, it is returned to the concentration, drying, and magnetization unit 1 and the ultrasonic resonance magnetization device 2 for recycling.

[0017] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain the preferred examples of this application.

[0018] The above technical solution has the following advantages or beneficial effects: The system of this application does not require additional combustion-supporting gas; the material itself alone can achieve the required incineration temperature, residence time, and incineration rate for hazardous waste incineration. Solid materials are resonantly crushed using ultrasound, while simultaneously undergoing swirling magnetization. By adding magnetic combustion-supporting powder to the material, the high-viscosity alkaline organic waste solids acquire weak magnetism. The magnetic field assists the material's entry into the furnace for incineration, preventing material from sticking to the walls during transport. Simultaneously, it enhances the heat transfer efficiency between the solid waste and its interior, increases the incineration rate, and weakens the influence of the thermal field on the magnetic attraction of the solid waste. A magnetic field is installed at the top of the incinerator to slow the material's descent speed and increase the residence time, achieving a 99.99% incineration rate for high-viscosity organic solid waste. Electrodes are used to stabilize the molten pool temperature to meet the incineration temperature requirements; the electrode output power is interlocked and controlled by the amount of material entering the furnace and its calorific value. The magnetic combustion-supporting powder in the slag is recovered through a pretreatment process using a salt separation system for recycling. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on the provided drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of a magnetic co-incineration system for high-viscosity alkaline organic waste according to an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the structure of the ultrasonic resonant magnet in a magnetic co-incineration system for high-viscosity alkaline organic waste according to an embodiment of this application.

[0022] Figure 3 This is a cross-sectional schematic diagram of the ultrasonic resonant magnet of a magnetic co-incineration system for high-viscosity alkaline organic waste according to an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the reverse magnetic conveying device of a magnetic co-incineration system for high-viscosity alkaline organic waste according to an embodiment of this application.

[0024] Figure 5 This is a schematic diagram of the incinerator structure of a magnetic co-incineration system for high-viscosity alkaline organic waste according to an embodiment of this application.

[0025] Among them, 1-Concentration, drying, and magnetization section; 2-Ultrasonic resonance magnetization device; 3-Reverse magnetic attraction conveying device; 4-Magnetic alkali combustion section; 5-Ash and slag separation section; 6-Evaporation and concentration device; 7-Drying device; 8-Feeding area; 9-Crushing and magnetization area; 10-Discharge area; 11-Primary filter screen; 43-Secondary filter screen; 12-Feed inlet; 13-Outlet bag filter; 14-Outlet electric valve; 15-Ultrasonic generator; 16-Magnetic combustion-supporting powder injection pipe; 17-Electromagnetic vibrator; 18-High level sensor; 19-Low level sensor; 20-First auxiliary magnetic field generator. 21-Generator; 22-Motor; 23-Driven shaft; 24-Conveying roller; 25-Conveyor belt; 26-Auxiliary roller; 27-Support frame; 28-Main combustion zone; 29-Electro-fused pool; 30-Second auxiliary magnetic field generator; 31-Ignition burner; 32-Solid waste feed chute; 33-Waste liquid spray gun; 34-Primary annular tuyer; 35-Secondary annular tuyer; 36-Burnout annular tuyer; 37-Discharge baffle; 38-Discharge chute; 39-Electrode assembly; 40-Oxygen supply port; 41-Slag cooling and dissolving device; 42-Salt separation pretreatment filtration device. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application and are intended to explain the inventive concept. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” and “circumferential” used in the description indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are for the purpose of simplifying the description only and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0028] The terms "first," "second," etc., used in the description are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature. The term "multiple" means two or more, unless otherwise explicitly specified.

[0029] Unless otherwise explicitly specified and limited, the terms "connected," "connected," etc., used in the description should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments according to the specific circumstances.

[0030] Unless otherwise expressly specified and limited, "above," "below," or "on top of" the second feature can mean that the first and second features are in direct contact or indirect contact through an intermediate medium. Furthermore, "above," "on top of," or "on top of" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," or "under" the second feature can mean that the first and second features are in direct contact or indirect contact through an intermediate medium. Furthermore, "below," "below," or "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The term "a specific embodiment" as used in the description means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] refer to Figure 1One specific embodiment of this application proposes a magnetic co-incineration system for high-viscosity alkaline organic waste. The system includes: a concentration, drying, and magnetization section 1; an ultrasonic resonance magnetization device 2; a reverse magnetic conveying device 3; a magnetic alkali incineration section 4; and an ash separation section 5. PTA-containing saline organic wastewater is passed into the evaporation and concentration device 6 of the concentration, drying, and magnetization section 1 for evaporation and concentration. Part of the concentrated wastewater is then sent to the drying device 7. Magnetic powder is added during the drying process to obtain a viscous magnetic waste. Solid waste generated from biochemical treatment, etc., is sent to the ultrasonic resonance magnetization device 2, where magnetic powder is also added to obtain magnetic waste. After the magnetic waste is fed into the magnetic alkali incineration section 4 via the reverse magnetic attraction conveyor 3, the remaining concentrated waste liquid is also fed into the magnetic alkali incineration section 4. The molten slag produced by the incineration of the magnetic waste and concentrated waste liquid is sent to the ash separation section 5. The ash separation section 5 includes a molten slag cooling and dissolving device 41, a salt separation pretreatment filtration device 42, and a grinding device. The molten slag produced by incineration is sent to the molten slag cooling and dissolving device 41 to be cooled to 60°C, and then sent to the salt separation pretreatment filtration device 42 to be dissolved with water. The alkaline solution after filtration enters the subsequent salt separation device to extract sodium carbonate and sodium bromide. The magnetic combustion-supporting powder retained by filtration is sent to the grinding device. After pulverization, it is returned to the concentration, drying, and magnetization section 1 and the ultrasonic resonance magnetization device 2 for recycling.

[0033] refer to Figure 2 One specific embodiment of this application proposes an ultrasonic resonance magnetization device for a magnetic co-incineration system of high-viscosity alkaline organic waste. The ultrasonic resonance magnetization device 2 performs ultrasonic resonance crushing, side-blowing swirl addition, and magnetization on solid waste. The ultrasonic resonance magnetization device 2 is a cylindrical body with an inlet 12 and an outlet bag filter 13 at the top and an outlet electric valve 14 at the bottom. The ultrasonic resonance magnetization device includes, from top to bottom, an inlet zone 8, a crushing and magnetization zone 9, and a frustum-shaped outlet zone 10. A primary filter 11 is provided between the inlet zone 8 and the crushing and magnetization zone 9, and a secondary filter 43 is provided between the crushing and magnetization zone 9 and the outlet zone 10.

[0034] Solid waste from the plant's biochemical treatment process enters the feeding zone 8 through inlet 12. The primary filter 11 in the feeding zone 8 is preferably 5 mesh with a pore size of 4 mm. Several ultrasonic generators 15 are arranged on the upper part of the crushing and magnetizing zone 9, near the side wall of the primary filter 11. The ultrasonic generators 15 perform preliminary resonance and crushing treatment on the large-particle solid waste on the primary filter 11. Solid waste crushed to below 5 mesh passes through the primary filter 11 and then enters the crushing and magnetizing zone 9, where it continues to be crushed to below 20 mesh through resonance. Several magnetic combustion-supporting powder injection pipes 16 are arranged in the lower middle part of the crushing and magnetizing zone 9. Magnetic combustion-supporting powder is injected into the crushing and magnetizing zone 9 through the magnetic combustion-supporting powder injection pipes 16, and the magnetic combustion-supporting powder mixes with the crushed solid waste to form a magnet.

[0035] Preferably, the number of magnetic combustion-supporting powder injection tubes 16 is 6 to 90 sets. The magnetic combustion-supporting powder injection tubes 16 can be arranged in staggered layers, and the specific arrangement is determined according to the size of the magnetizer. They are evenly distributed along the polar axis. Each magnetic combustion-supporting powder injection tube 16 is inclined at 20° to the center in the horizontal direction and at 20° upward in the vertical direction, so that the entire injection fluid forms a tangential upward swirling flow, which enhances the mixing and magnetization of solid waste and magnetic combustion-supporting powder. The magnetized solid waste powder falls into the discharge zone 10 through a secondary filter screen 43. The secondary filter screen 43 is preferably 20 mesh with an aperture of 0.85 mm. The upper and lower parts of the side wall of the discharge zone 10 are respectively equipped with a high-level sensor 18 and a low-level sensor 19 to monitor the material height. The side wall of the discharge zone 10 is also equipped with an electromagnetic vibrator 17. The high-level sensor 18 and the low-level sensor 19 interlock to control the outlet electric valve 14 and the electromagnetic vibrator 17. The electromagnetic vibrator 17 serves as an auxiliary discharge measure, interlocking with the activation of the outlet electric valve 14 to ensure smooth discharge. The equipment dimensions are determined based on the solid waste processing capacity; in this application, the preferred dimensions are a diameter of 4–20 m, an overall height of 8–40 m, a single-unit solid waste processing capacity of 1–10 t / h, an ultrasonic generator operating frequency of 10000–20000 Hz, and a single unit power of 0.25–1.1 kW.

[0036] refer to Figure 3 One specific embodiment of this application proposes a reverse magnetic conveying device 3 for a magnetic co-incineration system of high-viscosity alkaline organic waste. The reverse magnetic conveying device 3 includes a conveyor belt 25, a support frame 27, a drive shaft 22, a driven shaft 23, conveying rollers 24, and auxiliary rollers 26. A motor 21 drives the drive shaft 22 to rotate, thereby driving the conveyor belt 25. A first auxiliary magnetic field generator 20 is provided above the conveyor belt 25. The magnetized solid waste enters the conveyor belt 25 and is conveyed downstream by the belt. During the conveying process, the first auxiliary magnetic field generator 20 generates a magnetic attraction force on the solid waste, which counteracts most of the gravity of the magnetic waste itself. The remaining gravity is converted into the friction force required for conveying. The reverse magnetic conveying device 3 of this application, by setting up the first auxiliary magnetic field generator 20 above the conveyor belt 25, generates a magnetic field that forms a magnetic attraction force on the material, thereby reducing the force of the material's own gravity on the belt. Ultimately, this avoids the situation where the solid waste adheres to the surface of the conveyor belt 25 due to excessive force, thus preventing smooth discharge.

[0037] refer to Figure 4One specific embodiment of this application proposes a magnetic alkali incineration section 4 of a magnetic co-incineration system for high-viscosity alkaline organic waste. The magnetic alkali incineration section 4 includes an incinerator, which is an insulated furnace with a circular cross-section. The upper part of the furnace is the main combustion zone 28, and the lower part is an electric molten pool 29, which is an auxiliary combustion zone. A second auxiliary magnetic field generator 30 is installed on the top of the furnace, and an ignition burner 31 is also provided. The magnetic field generated by the second auxiliary magnetic field generator 30 forms a magnetic attraction force on the magnetic waste fed into the incinerator, slowing down the falling speed of the material and increasing the residence time of the solid waste in the main combustion zone 28. The ignition burner 31 serves as an ignition and furnace start-up and heating device. Solid waste feed chutes 32 are evenly distributed along the circumference of the upper part of the side wall of the incinerator, and the inlet of the solid waste feed chutes 32 is preferably equipped with an electric cover. A primary annular tuyer 34 is located below the solid waste feed chute 32, with the tuyer oriented tangentially to create a swirling flow of primary air that carries away the solid waste from the outlet of the solid waste feed chute 32, evenly distributing the solid waste across the entire incineration surface. Below the primary annular tuyer 34 are waste liquid spray guns 33, the number of which is selected based on the waste liquid volume, evenly arranged in a ring, and staggered from the outlet of the solid waste feed chute 32 above. Below the waste liquid spray guns 33 are secondary annular tuyer 35s, also tangentially arranged, to create a swirling flow of secondary air and prevent the waste liquid spray guns from directly spraying the waste liquid onto the inner wall of the opposite incinerator. A burnout annular tuyer 36 is located at the central elevation of the main combustion zone 28, through which a large amount of combustion air enters for oxygen-enriched combustion of the material.

[0038] The lower part of the incinerator, the electrofusion pool 29, is equipped with a discharge baffle 37, a discharge chute 38, an electrode assembly 39, and an oxygen supply port 40. The waste liquid achieves an incineration rate of over 99.9% in the main combustion zone 28, and the solid waste achieves an incineration rate of over 95%. The remaining waste enters the electrofusion pool 29, where the liquid level is controlled at 1-2 meters. The electrofusion pool 29 forms a stratification of old and new materials; incompletely incinerated materials are suspended in the upper layer, while completely incinerated materials enter the lower layer. The specific stratification line and the liquid level of the electrofusion pool 29 are adjusted according to the designed processing capacity. The discharge chute 38 is located at the bottom edge of the electrofusion pool 29 as the discharge outlet for completely incinerated materials. The discharge baffle 37 is a submersible baffle located above the discharge chute 38, with a submersion depth of 2 / 3 of the liquid level depth, ensuring that incompletely incinerated materials in the upper layer do not directly enter the discharge chute 38. Electrode assembly 39 is installed in the upper part of the electric molten pool 29 to stabilize the pool temperature at the set value. The output power of electrode assembly 39 is controlled by interlocking based on the thermal calculation of the solid waste and waste liquid entering the furnace. Electrode assembly 39 is distributed in a ring throughout the molten pool to ensure the stability of the temperature field of the entire molten pool. An oxygen supply port 40 is installed below the liquid level stratification line to supplement a small amount of oxygen to meet the oxygen requirements for complete incineration of solid waste.

[0039] One specific embodiment of this application proposes an operation method for a magnetic co-incineration system for high-viscosity alkaline organic waste. Saline organic wastewater, such as organic wastewater generated in the petrochemical industry (e.g., PTA), is first passed into an evaporation and concentration device 6 to initially concentrate the low-concentration wastewater to 50%. X% of the concentrated wastewater is then sent to a drying device 7. During the drying process, magnetic combustion-supporting powder is added to magnetize the dried material, resulting in a viscous magnetic waste. Solid waste, such as solid waste generated from biochemical treatment in a plant, is sent to an ultrasonic resonance magnetization device for magnetization treatment, also yielding magnetic waste. After the system stabilizes, the magnetic combustion-supporting powder can be filtered and recovered through a subsequent salt pretreatment device, thus enabling the magnetic combustion-supporting powder to be recycled.

[0040] After the saline organic wastewater and solid waste are treated with magnetization to obtain magnetic waste, the magnetic waste is sent to the conveyor belt 25 of the reverse magnetic attraction conveyor 3. The electromagnetic field arranged above the conveyor belt 25 forms an attraction force on the magnetic waste on the conveyor belt 25. The magnitude of the attraction force is adjusted by the output power of the first auxiliary magnetic field generator 20. The electromagnetic field attraction control makes 70% to 95% of the gravity of the magnetic waste itself canceled by the magnetic field attraction force. The remaining small part of the uncancelled gravity is converted into the friction force required for the conveyor belt 25 to transport, thus preventing a large amount of high-viscosity alkaline organic solid waste from adhering to the conveyor belt 25.

[0041] Magnetic waste is transported to the solid waste feed chute 32 on the top side of the magnetic alkali incinerator using magnetic field-assisted conveying technology. Undried concentrated wastewater is pumped to the waste liquid spray gun 33 on the upper side of the magnetic alkali incinerator and sprayed into the incinerator for combustion via pneumatic atomization. An electromagnetic field positioned at the top of the incinerator controls the slow descent of the magnetic waste fed into the furnace via the solid waste feed chute 32. By adjusting the output power of the second auxiliary magnetic field generator 30, the descent time of the magnetic waste in the main combustion zone 28 at the top of the incinerator is ensured to be greater than or equal to 2 seconds to guarantee effective incineration. The incinerated magnetic waste falls into the electrofusion pool 29 at the bottom of the incinerator for further melting and combustion to ensure complete incineration. Based on the amount and calorific value of the material fed into the incinerator, the output power of the electrode group 39 in the fused pool 29 is calculated and interlocked to maintain the temperature of the fused pool 29 at 1100-1150℃. The completely incinerated molten salt liquid settles downwards and is discharged as slag from the discharge chute 38. The discharged molten slag enters the slag cooling and dissolving device 41, and then passes through the salt separation pretreatment filtration device 42 to recover the magnetic combustion-supporting powder. The recovered magnetic combustion-supporting powder is then ground into powder by the grinding device and recycled. The salt-containing solution enters the subsequent salt separation system to recover Na2CO3 and NaBr.

[0042] This application relates to a magnetic combustion-supporting powder for PTA waste, comprising the following metal components: iron (Fe): 40-50%; silver (Ag): 5-10%; and rare metals, such as cobalt (Co): 1-3%. Fe primarily imparts magnetism and magnetic attraction to the solid material; Ag enhances the intensity and speed of heat transfer from the outside to the inside during combustion, increasing the incineration rate; and rare metals mitigate the damage of the high-temperature field to the magnetism and magnetic attraction of the solid material, and reduce the viscosity between materials. The magnetic combustion-supporting powder has a particle size ≤50μm. This ultra-small particle size facilitates better penetration into the pores of the solid material, resulting in better and more uniform adhesion to the surface and pores of the solid waste. The magnetic combustion-supporting powder of this application not only magnetizes solid waste but also enhances its heat transfer, increases the incineration rate, and weakens the influence of the thermal field on the magnetic attraction of the solid waste.

[0043] The required calorific value Q1 of the composite material to maintain the incinerator temperature above 1100℃ was determined through material analysis and thermodynamic calculations. X% of the waste liquid, evaporated and concentrated to 50% concentration, was further concentrated and dried to 90% concentration to form a viscous solid waste, thereby increasing the overall calorific value into the furnace to Q1. Because the composite calorific value was increased, no additional combustion aids were needed to achieve the design temperature above 1100℃ during the entire combustion process. The formula for calculating X is: Q1: The overall calorific value of the material fed into the furnace, which is a known condition; V 总 : Total waste liquid treatment volume, which is a known condition; V 液 Vsolid: Amount of alkaline organic waste liquid not included in the concentration and drying process; Qsolid: Amount of alkaline organic solid waste from the concentration and drying process. 液 The calorific value of the waste liquid after evaporation and concentration to 50% is known; Q 固 : The calorific value of the solid waste after concentration and drying to 90%, which is a known condition; X%: the liquid-solid conversion ratio, which is the quantity to be solved.

[0044] Magnetic combustion-aiding powder is added to wastewater during the material concentration and drying process, making the dried solid waste magnetic. Solid waste from the plant's biochemical treatment process is fed into an ultrasonic resonance mixer for powder addition and magnetization. The solid waste with added magnetic combustion-aiding powder is conveyed into the upper side feed inlet of the incinerator via a magnetic field-assisted conveyor. An electromagnetic field is arranged above the conveyor to magnetically attract the magnetic combustion-aiding powder on the conveyor. The strength of the attraction is adjusted by the output power of the electromagnetic field, so that 70% to 95% of the weight of the solid material is offset by the magnetic field attraction, and the remaining weight is converted into the friction force required for transportation, avoiding the sticking and clogging problems of high-viscosity alkaline organic solid waste.

[0045] The incinerator has an upper furnace chamber as the main combustion zone 28 and a lower section as an auxiliary combustion zone, specifically an electric melting pool 29. Organic alkaline waste liquid and solid waste enter the incinerator from the upper side. The waste liquid is completely burned in the main combustion zone 28, while the solid waste undergoes primary combustion in the main combustion zone 28 before freely settling into the electric melting pool 29 for secondary incineration. A second auxiliary magnetic field generator 30, mounted on top of the main combustion zone 28, generates a magnetic field that attracts the magnetic waste entering the incinerator, slowing its descent and increasing its residence time, thus achieving complete incineration of the solid waste. The magnitude of the attraction force in each combustion section is adjusted by controlling the output of the electromagnetic field. The required attraction force to ensure sufficient residence time is calculated using the following formula, and the electromagnetic field output power is then adjusted accordingly. a n F: Acceleration at a distance of n meters from the furnace top; m: Average mass of magnetic waste; g: Gravitational acceleration; 引n : Magnetic field attraction at a distance of n meters below the furnace top; β: Thermal field fluctuation coefficient (values ​​range from 0.7 to 0.9); K: Experimental correction coefficient (values ​​range from 0.8 to 0.95); ε n Mass attenuation constant (value = 1 / H*n*0.9).

[0046] Vn=V n-1 +a n t n a n Acceleration at a point n meters below the furnace top; h n : The height n meters below the furnace top (taken as 1, the residence time in the furnace is calculated in segments of one meter); V n The speed at a point n meters below the furnace top; t n The residence time of magnetic waste at a distance of n meters, where n ranges from 1 to H (H is the furnace height). Since the magnetic attraction weakens as the solid waste falls, the residence time t needs to be calculated in segments. n To obtain the total stay time Σt n F is adjusted by changing the output power of the electromagnetic field. 引n The size of the solid waste determines the total residence time Σt of the solid waste in the main combustion zone. n ≥2s.

[0047] In addition, an electric melting pool 29 is installed at the bottom of the incinerator. Solid waste that is almost completely incinerated in the main combustion zone 28 enters the electric melting pool 29 for further incineration to ensure a 99.9% incineration rate. The electric melting pool 29 uses electrode assembly 39 to stabilize the melting pool temperature at 1100-1150℃ to create the required temperature for the incinerated material. The output power of electrode assembly 39 is interlocked and controlled by the amount of material entering the furnace and its calorific value. Through interlocking control, the melting pool temperature is guaranteed on the one hand, and energy waste caused by excessively high melting pool temperature is avoided on the other hand.

[0048] The liquid level of the electrofused pool 29 is designed to allow for the stratification of fully reacted molten salt and unreacted solid waste. The fully reacted molten sodium salt, being denser, settles to the lower layer of the pool and is discharged from the slag outlet. Unreacted organic salt-containing solid waste remains suspended in the upper layer of the pool for combustion. Simultaneously, a submerged discharge baffle 37 is installed at the slag outlet of the electrofused pool 29 to prevent the upper layer of salt-containing organic solid waste from escaping directly through the discharge chute 38. High-temperature flue gas from the incinerator outlet is drawn into the upper part of the pool to ensure sufficient oxygen for the reaction of residual organic salt-containing solid waste in the upper layer.

[0049] Example 1: A zero-discharge resource utilization project for 6 million tons of PTA wastewater. The PTA wastewater is shown in Table 1 below.

[0050] Table 1 PTA Wastewater

[0051]

[0052] In Table 1, the wastewater from sequences 2 and 3 is first concentrated through multi-effect evaporation to obtain a concentrate of 5.95 t / h (20%). This concentrate, along with 18 t / h (20%) of CRU wastewater from sequence 1, is pumped to the pre-furnace single-effect feed tank for mixing, resulting in a total concentrate of 23.95 t / h (20%). This concentrate is then pumped to a forced circulation evaporator for further evaporation and concentration. The pre-furnace single-effect feed tank uses 138℃, 0.25MPa steam as a heat source, allowing for condensate recovery and reuse. Simultaneously, the secondary steam condensate can be returned to the plant's wastewater system. The effluent from the pre-furnace single-effect feed tank, at 9.58 t / h with a solids content of 50%, is adjusted for pH and then pumped into the alkali furnace buffer tank. At this point, the total concentrated wastewater volume is approximately 10 t / h with a solids content of approximately 50% and a calorific value of approximately 720 kcal / kg.

[0053] 55% of the 10t / h wastewater is taken and further dried to 90% concentration in the drying unit 7. The remaining 45% of high-concentration wastewater is directly pumped to the waste liquid spray gun 33 of the incinerator for atomization and feeding. During the drying process, magnetic combustion-aiding powder is added to the 55% wastewater to magnetize it. The magnetized dried material is conveyed by the reverse magnetic attraction conveyor 3. The electromagnetic field above the conveyor belt forms an upward attraction force on the magnetic combustion-aiding powder, reducing the adhesion of the material's own weight to the belt surface. The solid waste is conveyed to the solid waste feed chute 32 through magnetic field-assisted conveying technology and then fed into the furnace for incineration.

[0054] The incinerator has a furnace diameter of approximately 4700 mm, a main combustion zone 28 height of approximately 15000 mm, and an auxiliary combustion zone height of approximately 2000 mm. The total feed material consists of atomized wastewater and dried solid waste (7.56 t / h, calorific value approximately 1100 kcal / kg). High-concentration wastewater enters the incinerator through waste liquid spray guns 33 on the upper side of the furnace and is incinerated in the main combustion zone 28. The dried material first enters the main combustion zone 28 for combustion. The actual combustion temperature in the main combustion zone 28 is approximately 1166℃, meeting design requirements, eliminating the need for additional combustion-supporting fuel. The dried material achieves a combustion rate of over 95% in the main combustion zone 28 and then enters the molten pool 29 in the auxiliary combustion zone. After reaching the required combustion standard, it settles and flows by gravity into the slag outlet to exit as molten slag. The molten slag at the incinerator outlet enters the cold slag system for cooling, and after cooling to 60℃, it enters the melting pool for dissolution. Sodium salt is soluble in water, while magnetic combustion-supporting powder is insoluble in water. The dissolved alkaline and magnetic solution is first filtered. The filtered alkaline solution enters the subsequent salt separation system to extract sodium carbonate and sodium bromide. The magnetic combustion-supporting powder retained by the filter enters the grinding and powdering system and is then returned to the front-end drying device 7 for recycling.

[0055] Although embodiments of this application have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting this application. Various changes and modifications may be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of the claims of this application.

Claims

1. A magnetic co-incineration system for high-viscosity alkaline organic waste, characterized in that: The magnetic alkali incineration section of the system includes a cylindrical incinerator. A second auxiliary magnetic field generator and an ignition burner are installed on the top of the incinerator. The upper part of the incinerator is the main combustion zone, and the lower part is an electric melting pool for the auxiliary combustion zone. The upper sidewall of the main combustion zone is arranged from top to bottom as follows: a solid waste feed chute, a primary annular tuyer, a waste liquid spray gun, and a secondary annular tuyer. The primary and secondary annular tuyer tuyer vents are arranged tangentially. The outlet of the solid waste feed chute and the outlet of the waste liquid spray gun are staggered vertically. A burnout annular tuyer is located in the middle of the sidewall of the main combustion zone. The system also includes a concentration, drying, and magnetization section for treating organic waste liquid and an ultrasonic resonance magnetization device for treating solid waste. The organic waste liquid is treated in the concentration, drying, and magnetization section to obtain viscous magnetic waste. The solid waste is fed into the ultrasonic resonance magnetization device, where it is ultrasonically pulverized and mixed with magnetic powder to obtain magnetic waste. The magnetic waste is then conveyed to the solid waste feed chute via a reverse magnetic conveying device. The furnace incineration; the concentration, drying, and magnetization section includes an evaporation and concentration device and a drying device; the metallic composition of the magnetic powder includes 40-50% iron, 5-10% silver, and 1-3% rare metals, and the particle size of the magnetic powder is less than or equal to 50μm; the ultrasonic resonance magnetization device includes, from top to bottom, a feeding zone, a primary filter, a crushing and magnetization zone, a secondary filter, and a discharge zone. An ultrasonic generator is installed on the upper part of the crushing and magnetization zone and on the side wall near the primary filter, and a magnetic combustion-supporting powder injection pipe is installed in the middle and lower part of the crushing and magnetization zone; the solid waste processing capacity of the ultrasonic resonance magnetization device is 1-10t / h, the diameter is 4-20m, the height is 8-40m, the primary filter is 5 mesh with a pore size of 4mm, and the secondary filter is 20 mesh with a pore size of 0.85mm; the incineration temperature of the magnetic waste in the main combustion zone is maintained above 1100℃, and the incineration residence time is controlled to be ≥2s by controlling the power of the second auxiliary magnetic field generator.

2. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 1, characterized in that: After the organic wastewater is concentrated by an evaporation and concentration device, X% of the concentrated waste liquid is added to magnetic powder and dried. The remaining concentrated waste liquid is sent to a waste liquid spray gun. The formula for calculating X% is as follows: Q1: Comprehensive calorific value of the material fed into the furnace, V 总 Total waste liquid treatment volume, V 液 : Without increasing the concentration and drying of alkaline organic waste liquid, V 固 Q: The amount of alkaline organic solid waste in the concentrated and dried section. 液 : Calorific value of the waste liquid after evaporation and concentration to 50%; Q 固 Calorific value of solid waste after concentration and drying to 90%.

3. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 1, characterized in that: The reverse magnetic conveying device has a first auxiliary magnetic field generator above the conveyor belt. During the conveying process, the first auxiliary magnetic field generator generates a magnetic attraction force on the magnetic waste to counteract most of the gravity of the magnetic waste itself, and the remaining part generates the friction force required for conveying.

4. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 3, characterized in that: The reverse magnetic conveying device includes a conveyor belt, a support frame, a drive shaft, a driven shaft, conveying rollers, and auxiliary rollers. The motor drives the drive shaft to rotate, which in turn drives the conveyor belt. The first auxiliary magnetic field generator is located above the conveyor belt. The magnetized solid waste enters the conveyor belt and is conveyed by the conveyor belt to the solid waste feed chute.

5. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 1, characterized in that: The magnetic combustion-supporting powder injection tube is tilted 20° horizontally toward the center of the circle and 20° vertically upwards from the horizontal plane.

6. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 5, characterized in that: The ultrasonic resonance magnetization device has an inlet and an outlet bag at the top, and an outlet electric valve at the bottom; the ultrasonic generator operates at a frequency of 10,000 to 20,000 Hz, and the number of magnetic combustion-supporting powder injection tubes is 6 to 90 sets.

7. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 1, characterized in that: The electric melting pool is equipped with a discharge baffle, a discharge chute, an electrode assembly, and an oxygen supply port. The liquid level in the electric melting pool is controlled at 1-2m. The discharge chute is located at the bottom edge of the electric melting pool as the discharge outlet for completely incinerated material. The discharge baffle is an immersion type baffle located above the discharge chute, with the immersion depth of the discharge baffle being 2 / 3 of the liquid level depth. An electrode assembly is installed in the upper part of the electric melting pool to stabilize the melting pool temperature at 1100-1150℃. An oxygen supply port is located below the liquid level stratification line.

8. The magnetic co-incineration system for high-viscosity alkaline organic waste according to claim 1, characterized in that: The system also includes an ash separation section, which includes a slag cooling and dissolving device, a salt pretreatment and filtration device, and a grinding device. The molten slag produced by the incinerator is sent to the slag cooling and dissolving device to be cooled to 60°C, and then sent to the salt pretreatment and filtration device to be dissolved in water. The filtered alkaline solution enters the subsequent salt separation device to extract sodium carbonate and sodium bromide. The magnetic combustion-supporting powder retained by the filter is sent to the grinding device, and after grinding, it is returned to the concentration, drying, and magnetic attachment section and the ultrasonic resonance magnetic attachment device for recycling.

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