CN113526835A - Fenton iron mud drying system and process and application - Google Patents

Fenton iron mud drying system and process and application Download PDF

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Publication number
CN113526835A
CN113526835A CN202110872270.1A CN202110872270A CN113526835A CN 113526835 A CN113526835 A CN 113526835A CN 202110872270 A CN202110872270 A CN 202110872270A CN 113526835 A CN113526835 A CN 113526835A
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fluidized bed
fenton iron
mud
photocatalytic
iron mud
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赵改菊
于子扬
于贺伟
孙荣峰
王鲁元
耿文广
员冬玲
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Energy Research Institute of Shandong Academy of Sciences
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/40—Acidic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/42—Basic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/44—Organic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8678—Removing components of undefined structure
    • B01D53/8687—Organic components

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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Abstract

The invention belongs to the technical field of Fenton iron mud treatment, and particularly relates to a Fenton iron mud drying system, a process and application. Fenton iron mud drying system includes: a granulation device, a vibrating fluidized bed, a photocatalytic device and a dry sludge storage bin; the feed inlet of the vibrating fluidized bed is connected with the granulating device, and the discharge outlet of the vibrating fluidized bed is connected with the dry sludge storage bin; the photocatalytic device is arranged on the top of the outer box body of the vibrated fluidized bed and communicated with the inner space of the vibrated fluidized bed. The invention adopts the cooperation of the photocatalytic reactor and the vibrated fluidized bed for drying, can carry out deep drying treatment on the Fenton iron mud, avoids agglomeration and simultaneously degrades the generated VOCs, and the arrangement of the photocatalytic reactor can obviously reduce the air volume in the vibrated fluidized bed, reduce the load in the post-treatment process and realize the high-efficiency drying treatment of the Fenton iron mud.

Description

Fenton iron mud drying system and process and application
Technical Field
The invention belongs to the technical field of Fenton iron mud treatment, and particularly relates to a Fenton iron mud drying system, a process and application.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The Fenton oxidation process is an economic and efficient wastewater treatment technology, has the advantages of strong oxidizability, low cost, capability of being carried out at normal temperature and normal pressure and the like, and is widely applied to the industries of textile, pharmacy, papermaking, garbage treatment, chemical industry and the like. The Fenton oxidation reaction is carried out under acidic condition, and Fe is generated in the reaction process2+Will be continuously oxidized into Fe3+After the reaction is finished, adding alkali liquor to regulate the solution to be neutral or alkalescent, and then adding a certain amount of flocculating agent to make Fe3+With Fe (OH)3Is precipitated and Fe (OH) is filtered off3And is separated from the solution, thereby effectively treating the industrial wastewater. However, the filtered sludge contains a large amount of heavy metals and organic matters difficult to degrade, which belong to industrial hazardous waste, and if the sludge is directly discharged, the ecological environment can be seriously damaged. At present, the Fenton iron mud treatment measures in China mainly include landfill, drying, composting, cement-based curing and the like. The Fenton iron mud has extremely high water content, and the transportation cost and the increase can be increased by directly disposing and utilizing the Fenton iron mudThe iron mud handling capacity, and carry out drying process in advance to fenton iron mud not only can effectively get rid of the refractory organic matter in the fenton iron mud, and the volume of iron mud can reduce by a wide margin, has both practiced thrift the cost for subsequent transportation and processing, has created the condition for the resource utilization of fenton iron mud again.
Among the prior art, the drying process to fenton iron mud generally adopts drying cabinet or ordinary fluidized bed to dry, and this kind of drying method produces the caking phenomenon easily, and a large amount of VOCs (volatile organic compounds) that produce in the drying process can make very big burden to tail gas dust removal, purification treatment process moreover, make whole drying process very low efficiency, consequently, it has important meaning to provide a high efficiency system and the technology of carrying out the dry of fenton iron mud.
Disclosure of Invention
In order to solve the defects of the prior art, the Fenton iron mud drying system and the process provided by the invention adopt the photocatalytic reactor and the vibrating fluidized bed to be matched for drying, can carry out deep drying treatment on the Fenton iron mud, avoid agglomeration and degrade generated VOCs, and the arrangement of the photocatalytic reactor can obviously reduce the air quantity in the vibrating fluidized bed, reduce the load in the post-treatment process and realize efficient drying treatment of the Fenton iron mud.
In order to achieve the above object, a first aspect of the present invention provides a fenton iron mud drying system, including: a granulation device, a vibrating fluidized bed, a photocatalytic device and a dry sludge storage bin;
the feed inlet of the vibrating fluidized bed is connected with the granulating device, and the discharge outlet of the vibrating fluidized bed is connected with the dry sludge storage bin; the photocatalytic device is arranged on the top of the outer box body of the vibrated fluidized bed and communicated with the inner space of the vibrated fluidized bed.
The second aspect of the invention provides a Fenton iron mud drying process, which comprises the following specific steps:
the Fenton iron mud is granulated and crushed by a granulating device and then is sent to a vibrating fluidized bed for drying, VOCs generated during drying are continuously degraded by a photocatalytic device, and the dried Fenton iron mud is discharged from a discharge port at the bottom of the vibrating fluidized bed and is conveyed to a dry sludge storage bin; and (3) allowing the gas in the vibrating fluidized bed to enter a dust removal device, performing dust removal treatment, conveying the collected dry powder to a dry sludge storage bin, and discharging the residual gas after dust removal after treatment of a tail gas treatment device.
The third aspect of the invention provides an application of the Fenton iron mud drying system in the fields of waste resource utilization and materials.
One or more embodiments of the present invention have at least the following advantageous effects:
(1) the Fenton iron mud is dried by adopting the vibrating fluidized bed, so that a uniform fluidized state can be obtained, the heat and mass transfer strength and the drying efficiency are improved, the heat transfer coefficient and the phase interface area are increased, the turbulent degree of a boundary layer is increased, the drying effect of the Fenton iron mud is enhanced, the phenomena of difficult dispersion and caking in hot air flow in the drying process of the iron mud are relieved, and a more uniform dried product is obtained.
(2) According to the invention, the photocatalysis device is arranged at the top of the vibrating fluidized bed, VOCs generated in the Fenton iron mud drying process are effectively degraded by using the photocatalysis technology, and the cooperation of the vibrating fluidized bed and the photocatalysis device is beneficial to reducing the gas volume of the system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a fenton iron mud drying system provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a VOCs detector provided in embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a photocatalytic device provided in embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a solar lighting device provided in embodiment 1 of the present invention.
The system comprises a storage bin 1, a mud conveying pump 2, a mud conveying pipe 3, a mud crusher 4, a vibrating fluidized bed inner box body 5, a vibrating fluidized bed outer box body 6, a VOCs detector 7, a heat source air inlet 8, a vibrating motor 9, a vibrating spring 10, a Fresnel lens 11, a light irradiation tracking device 12, a controller 13, a telescopic motor 14, a driving reactor 15, a photocatalysis plate 16, a connecting frame 17, a solar cell panel 18, a storage battery pack 19, a solar controller 20, an inverter 21, an ultraviolet lamp 22, a cyclone dust collector 23, an electric dust collector 24, an acid washing tower 25, an alkali washing tower 26 and a dry sludge storage bin 27.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, in the prior art, a drying oven or a common fluidized bed is generally adopted for drying, the drying mode is easy to cause caking phenomenon, and a large amount of VOCs (volatile organic compounds) generated in the drying process can cause great burden on the tail gas dedusting and purifying treatment process, so that the whole drying process is very inefficient.
In order to solve the above technical problem, a first aspect of the present invention provides a fenton iron mud drying system, including: a granulation device, a vibrating fluidized bed, a photocatalytic device and a dry sludge storage bin;
the feed inlet of the vibrating fluidized bed is connected with the granulating device, and the discharge outlet of the vibrating fluidized bed is connected with the dry sludge storage bin; the photocatalytic device is arranged on the top of the outer box body of the vibrated fluidized bed and communicated with the inner space of the vibrated fluidized bed.
Wherein the content of the first and second substances,
the invention adopts the vibrated fluidized bed to dry the Fenton red mud, and the reason is that: the flue gas that the hot source air intake got into bottom the vibrated fluidized bed can break up fenton iron mud and carry out the fluidization heating, and the vibrating motor of vibrated fluidized bed lasts the throwing and produces exciting force, makes fenton iron mud jump along fixed direction and gos forward, effectively reduces the caking phenomenon among the fenton iron mud drying process.
A large amount of VOCs can be generated in the Fenton iron mud drying process by adopting the vibrated fluidized bed, most of VOCs have toxicity, pollution and irritation, and have strong harmfulness to human bodies, and if the VOCs are directly discharged, the ecological environment can be seriously damaged, so that air pollution is caused. Therefore, the photocatalysis technology and the vibrated fluidized bed are adopted to cooperate, energy photons in the light energy are utilized to excite the inside of the photocatalyst to form hydroxyl radicals and oxygen anions, and then an oxidation-reduction reaction is carried out, so that the nontoxic and harmless degradation treatment of the VOCs is realized.
The invention connects the photocatalytic device with the vibrated fluidized bed, degrades VOCs generated in the Fenton red mud drying process in time and can prevent the VOCs generated in the drying process from being discharged into the atmosphere to cause environmental pollution. The gas quantity in the vibrating fluidized bed can be reduced by 70-80% compared with a common fluidized bed dryer, so that the load of equipment during subsequent aftertreatment of gas can be obviously reduced, and the treatment efficiency is further improved.
The granulating device is used for obtaining fine Fenton red mud particles, so that the contact area of the fine Fenton red mud particles with hot smoke is larger during subsequent drying treatment of the vibrating fluidized bed, the drying effect is better, and efficient drying is realized. In a preferred embodiment, the granulated particles have a particle size of: 3-8 mm, too small particle size is easy to be entrained by air flow, and too large particle size is not suitable for fluidization.
In one or more embodiments of the invention, the granulation device comprises a sludge bin, a sludge conveying pump, a sludge conveying pipe and a sludge crusher; the fenton iron mud in the mud bin is conveyed to the mud conveying pipe through the mud conveying pump and then conveyed to the mud crusher through the mud conveying pipe.
In one or more embodiments of the present invention, the photocatalytic device includes: the device comprises a Fresnel lens, a photocatalytic plate, a connecting rod, a light tracking device, a controller, a telescopic motor and a driving reactor;
the illumination tracking device is fixed on the Fresnel lens, and the photocatalytic plate is arranged right below the Fresnel lens; fresnel lens is fixed in the outer box top of fluidized bed through the side link, and flexible motor is connected to side link one end, and the drive reactor is connected to the other end, and flexible motor and drive reactor all link to each other with the controller.
The Fresnel lens is used for focusing sunlight and gathering the sunlight onto the photocatalytic plate; the illumination tracking device is fixed above the Fresnel lens and used for tracking the sun rays and transmitting information to the controller to ensure that sunlight is vertically incident on the Fresnel lens in real time; the controller processes signals transmitted by the illumination tracking device and sends instructions to the telescopic motor and the driving reactor in sequence; the telescopic motor is used for controlling the telescopic length of one side of the connecting rod, so that the deflection angle of the Fresnel lens is adjusted; the driving reactor adjusts the pitching angle of the Fresnel lens by controlling the rotation of the cross bar of the connecting rod and the Fresnel lens.
Furthermore, the photocatalytic plate in the photocatalytic device takes a sliding stone plate or an aluminum plate as a carrier, and the surface of the photocatalytic plate is coated with nano TiO2。
Furthermore, the Fresnel lens in the photocatalysis device is fixed with the cross bar of the side link, and the cross bar of the side link can rotate for 180 degrees.
The current photocatalytic devices can be classified into non-focusing type and focusing type according to the irradiation mode of the light source. The non-aggregation reactor mainly adopts an electric light source, has simple integral structure, high efficiency and quick reaction, but has larger electric energy loss and higher catalytic cost in the operation process; the concentration reactor uses sunlight as a light source, and has low energy consumption and slow reaction rate. In order to realize the photocatalytic device with low energy consumption and high efficiency, the invention adopts the solar device and the photocatalytic device to be matched for degrading VOCs;
the solar lighting device sets up in the outer box top of vibrated fluidized bed, includes: the solar energy control system comprises a solar cell panel, a storage battery pack, a solar energy controller, an inverter and an ultraviolet lamp; the solar panel in the solar illumination device absorbs solar energy in the daytime and charges the storage battery pack under the control of the solar controller, the storage battery pack is controlled by the solar controller to supply power to the ultraviolet lamp at night, and the inverter converts direct current in the power supply process into alternating current.
The invention adopts the mode of combining sunlight and ultraviolet rays to alternately provide a light source for the photocatalytic device. The solar light irradiation device utilizes the energy stored in the daytime and provides ultraviolet light to inject into the photocatalytic plate at night, so that the defects of high electric energy loss and high operating cost of the traditional electro-optic source photocatalytic device are overcome, the working time of the system is greatly prolonged, and all-weather degradation of VOCs is realized.
The solar cell panel in the solar lighting device adopts a copper indium gallium selenide solar cell panel.
In one or more embodiments of the invention, the air inlet of the vibrated fluidized bed is connected with the air inlet of the heat source, and the tail gas outlet of the vibrated fluidized bed is connected with a dust removal device;
further, the dust removing device comprises a cyclone dust remover and an electric dust remover.
In one or more embodiments of the invention, the system further comprises a tail gas treatment device, and the dust removal device is connected with the tail gas treatment device;
further, the tail gas treatment device comprises an acid washing tower and a caustic washing tower.
In one or more embodiments of the present invention, a VOCs detector is disposed on the internal box of the vibrated fluidized bed, and the VOCs detector monitors the content of VOCs in the vibrated fluidized bed in real time, so as to determine when gas in the vibrated fluidized bed sequentially enters the dust removal device and the tail gas treatment device.
The second aspect of the invention provides a Fenton iron mud drying process, which comprises the following specific steps:
the Fenton iron mud is granulated and crushed by a granulating device and then is sent to a vibrating fluidized bed for drying, VOCs generated during drying are continuously degraded by a photocatalytic device, and the dried Fenton iron mud is discharged from a discharge port at the bottom of the vibrating fluidized bed and is conveyed to a dry sludge storage bin; and (3) allowing the gas in the vibrating fluidized bed to enter a dust removal device, performing dust removal treatment, conveying the collected dry powder to a dry sludge storage bin, and discharging the residual gas after dust removal after treatment of a tail gas treatment device.
Wherein, the gas in the vibrated fluidized bed is flue gas and carries moisture and the partially dry fenton iron mud that precipitate out among the drying process.
Further, adopt the VOCs detector to carry out real-time supervision to the VOCs content in the vibrated fluidized bed, after the VOCs content that the VOCs detector detected reached the standard value, gas in the vibrated fluidized bed got into dust collector.
Furthermore, the dust removal device comprises a cyclone dust collector and an electric dust collector, dry powder is separated from gas in the vibrated fluidized bed after the gas is treated by the cyclone dust collector, and the residual gas enters the tail gas treatment device for treatment after secondary dust removal by the electric dust collector.
Furthermore, the flue gas temperature of the air inlet of the heat source of the vibrated fluidized bed is 400-600 ℃, and the flue gas temperature of the air outlet is 100-130 ℃.
Furthermore, the photocatalysis device takes the sunlight as a light source during the daytime and takes an ultraviolet lamp as a light source during the night.
Furthermore, the absorption liquid of the acid washing tower is an alkaline solution for eliminating acid gases such as hydrogen sulfide and the like.
Further, the alkaline tower absorption liquid is an acidic solution for eliminating alkaline gases such as ammonia.
The third aspect of the invention provides an application of the Fenton iron mud drying system in the fields of waste resource utilization and materials.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
As shown in fig. 1-4, this embodiment provides a fenton iron mud drying treatment system and process, an outlet of a bin 1 is connected with a feed inlet of a box 5 in a vibrated fluidized bed through a sludge pump 2, a mud conveying pipe 3 and a mud crusher 4, the fenton iron mud in the bin is granulated into fine particles and then enters the vibrated fluidized bed for drying, the drying process is realized by heat exchange between hot flue gas entering through a heat source air inlet 8 and water, a vibrating motor 9 is installed on one side of the outer wall of the box 5 in the vibrated fluidized bed, a vibrating spring 10 is installed at the bottom of the box 5 in the vibrated fluidized bed and connected with the inner box and the outer box of the vibrated fluidized bed, the hot flue gas can fully contact with the fenton iron mud particles under the driving of the vibrating motor to dehydrate the fenton iron mud, and the dried fenton iron mud is discharged from a discharge outlet at the bottom of the vibrated fluidized bed and is conveyed to a dry sludge storage bin 27;
be provided with VOCs detector 7 on the box 5 in the vibrated fluidized bed, carry out real-time supervision to the VOCs content in the vibrated fluidized bed, produced VOCs is continuously degraded by photocatalytic unit in the fenton iron mud drying process.
The photocatalysis devices are all arranged at the top of the outer box 6 of the vibrated fluidized bed, the illumination tracking device 12 is fixed on the Fresnel lens 11, the Fresnel lens 11 is connected with the bottom through a connecting rod 17, one end of the connecting rod 17 is connected with a telescopic motor 14, the other end of the connecting rod 17 is connected with a controller 13 and a driving reactor 15, and the photocatalysis plate 16 is arranged under the Fresnel lens 11.
Photocatalytic device one side is provided with solar light device, provides the light source for photocatalytic device, includes: a solar panel 18, a storage battery 19, a solar controller 20, an inverter 21, and an ultraviolet lamp 22; the ultraviolet lamp 22 is arranged above the Fresnel lens 11 through a lamp post, the solar cell panel 18 is arranged at the top of the lamp post, and the storage battery pack 19, the solar controller 20 and the inverter 21 are all arranged at the bottom of the lamp post.
The gas outlet of box 5 is connected with the air inlet of cyclone 23 in the vibrated fluidized bed, makes the gas in the vibrated fluidized bed get into cyclone 23 and removes dust, and the discharge gate of cyclone 23 is connected with the feed inlet of dry sludge storage storehouse 27, separates out the dry powder and collects.
The gas outlet of the cyclone dust collector 23 is connected with the gas inlet of the electric dust collector 24, the residual gas in the cyclone dust collector continues to enter the electric dust collector 24 for secondary dust collection treatment, the gas outlet of the electric dust collector 24 is sequentially connected with the acid cleaning tower 25 and the alkali cleaning tower 26, and the gas after secondary dust collection is discharged after acid and alkali treatment.
Example 2
The embodiment provides a Fenton iron mud drying process, which comprises the following specific steps:
(1) the Fenton iron mud with the water content of 60% -70% is granulated and crushed by a granulating device and then enters a vibrating fluidized bed inner box body 5, the wet Fenton iron mud is scattered and heated by flue gas flow entering from a heat source air inlet 8 and reaches a fluidized state, a vibrating motor of the vibrating fluidized bed is continuously thrown to generate exciting force, so that the Fenton iron mud jumps and moves forwards along a fixed direction, the grain diameter of the iron mud is gradually reduced by continuous heating of the flue gas and repeated collision of particles of the Fenton iron mud, the crushing effect is achieved, meanwhile, the heating efficiency is enhanced, the caking phenomenon in the Fenton iron mud drying process is effectively reduced, the dried Fenton iron mud is discharged from a discharge port at the bottom of the vibrating fluidized bed inner box body 5 and is conveyed to a dry sludge storage bin 27;
(2) illumination tracking means 12 tracks the solar light source in real time and give controller 13 with signal transmission, controller 13 at first gives out the instruction to the flexible motor 14 of side link 17 one side, the deflection angle of fresnel lens 11 is adjusted to height through changing flexible motor 14, controller 13 gives out the instruction to the drive reactor 15 of side link 17 opposite side afterwards, drive reactor 15 is through the rotation of control side link 17 horizontal pole, and then adjust fresnel lens 11's every single move angle, thereby guarantee that sunshine jets into fresnel lens 11 perpendicularly all the time, sunshine after 11 gathers through fresnel lens shines into in the vibrated fluidized bed box 5 through photocatalysis board 16, carry out lasting degradation to produced VOCs in the fenton iron mud drying process.
The solar cell panel 18 continuously absorbs sunlight during the day and converts the sunlight into electric energy to be stored in the storage battery pack 19, when the solar illumination device cannot run at night, the solar controller 13 controls the storage battery pack 19 to supply power to the ultraviolet lamp 22, the inverter 21 converts direct current in a circuit into alternating current, ultraviolet rays emitted by the ultraviolet lamp 22 are emitted into the inner box body 5 of the vibrated fluidized bed through the photocatalytic plate 16, and all-weather degradation of VOCs is realized.
(3) VOCs detector 7 carries out real-time supervision to the VOCs content in the box 5 in the vibrated fluidized bed, after VOCs content reaches the standard value, the flue gas in the box 5 in the vibrated fluidized bed carries moisture and the dry fenton iron mud of part that appear among the drying process and gets into cyclone 23, handle the back through cyclone 23, the dry powder of collecting is carried to dry sludge storage warehousing 27 in, the flue gas then carries out the second grade dust removal in getting into electrostatic precipitator 24, at last in proper order through pickling tower 25, discharge system after alkaline tower 26 handles.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a fenton iron mud drying system which characterized in that: the method comprises the following steps: a granulation device, a vibrating fluidized bed, a photocatalytic device and a dry sludge storage bin;
the feed inlet of the vibrating fluidized bed is connected with the granulating device, and the discharge outlet of the vibrating fluidized bed is connected with the dry sludge storage bin; the photocatalytic device is arranged on the top of the outer box body of the vibrated fluidized bed and communicated with the inner space of the vibrated fluidized bed.
2. A fenton iron sludge drying system according to claim 1, characterized in that: the granulating device comprises a sludge bin, a sludge conveying pump, a sludge conveying pipe and a sludge crusher; the fenton iron mud in the mud bin is conveyed to the mud conveying pipe through the mud conveying pump and then conveyed to the mud crusher through the mud conveying pipe.
3. A fenton iron sludge drying system according to claim 1, characterized in that: the photocatalytic device includes: the device comprises a Fresnel lens, a photocatalytic plate, a connecting rod, a light tracking device, a controller, a telescopic motor and a driving reactor; the illumination tracking device is fixed on the Fresnel lens, and the photocatalytic plate is arranged right below the Fresnel lens; the Fresnel lens is fixed on the top of the outer box body of the fluidized bed through a connecting rod, one end of the connecting rod is connected with a telescopic motor, the other end of the connecting rod is connected with a driving reactor, and the telescopic motor and the driving reactor are both connected with a controller;
furthermore, the photocatalytic plate in the photocatalytic device takes a sliding stone plate or an aluminum plate as a carrier, and the surface of the photocatalytic plate is coated with nano TiO2；
Furthermore, the Fresnel lens in the photocatalysis device is fixed with the cross bar of the side link, and the cross bar of the side link can rotate for 180 degrees.
4. A fenton iron sludge drying system according to claim 1, characterized in that: the system still includes the solar light device, the solar light device sets up in the outer box top of vibrated fluidized bed, includes: the solar energy control system comprises a solar cell panel, a storage battery pack, a solar energy controller, an inverter and an ultraviolet lamp; the solar panel in the solar illumination device absorbs solar energy in the daytime and charges the storage battery pack under the control of the solar controller, the storage battery pack is controlled by the solar controller to supply power to the ultraviolet lamp at night, and the inverter converts direct current in the power supply process into alternating current;
furthermore, a solar cell panel in the solar lighting device adopts a copper indium gallium selenide solar cell panel.
5. A fenton iron sludge drying system according to claim 1, characterized in that: the air inlet of the vibrating fluidized bed is connected with the air inlet of the heat source, and the tail gas outlet of the vibrating fluidized bed is connected with a dust removal device;
further, the dust removing device comprises a cyclone dust remover and an electric dust remover.
6. A Fenton iron mud drying system of claim 5, characterized in that: the system also comprises a tail gas treatment device, and the dust removal device is connected with the tail gas treatment device;
further, the tail gas treatment device comprises an acid washing tower and a caustic washing tower.
7. A fenton iron sludge drying system according to claim 1, characterized in that: and a VOCs detector is arranged on the inner box body of the vibrated fluidized bed and is used for monitoring the content of VOCs in the vibrated fluidized bed in real time.
8. A Fenton iron mud drying process is characterized in that: the method comprises the following specific steps:
the Fenton iron mud is granulated and crushed by a granulating device and then is sent to a vibrating fluidized bed for drying, VOCs generated during drying are continuously degraded by a photocatalytic device, and the dried Fenton iron mud is discharged from a discharge port at the bottom of the vibrating fluidized bed and is conveyed to a dry sludge storage bin; gas in the vibrated fluidized bed enters a dust removal device, collected dry powder is conveyed to a dry sludge storage bin after dust removal treatment, and residual gas after dust removal is discharged out of the system after being treated by a tail gas treatment device;
further, adopt the VOCs detector to carry out real-time supervision to the VOCs content in the vibrated fluidized bed, after the VOCs content that the VOCs detector detected reached the standard value, gas in the vibrated fluidized bed got into dust collector.
9. A fenton iron sludge drying process according to claim 8, characterized in that: the flue gas temperature of the air inlet of the heat source of the vibrated fluidized bed is 400-600 ℃, and the flue gas temperature of the air outlet is 100-130 ℃;
or the photocatalysis device takes the sunlight as a light source during the daytime and takes the ultraviolet lamp as a light source at night;
or the absorption liquid of the acid washing tower is alkaline solution for eliminating acid gases such as hydrogen sulfide and the like;
or the alkaline tower absorption liquid is an acidic solution for eliminating alkaline gases such as ammonia.
10. Use of a fenton iron sludge drying system according to any one of claims 1-7 for resource utilization of waste and in the field of materials.
CN202110872270.1A 2021-07-30 2021-07-30 Fenton iron mud drying system and process and application Pending CN113526835A (en)

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