CN217585267U - Fly ash treatment system for counter-current rotary kiln system - Google Patents
Fly ash treatment system for counter-current rotary kiln system Download PDFInfo
- Publication number
- CN217585267U CN217585267U CN202221098234.0U CN202221098234U CN217585267U CN 217585267 U CN217585267 U CN 217585267U CN 202221098234 U CN202221098234 U CN 202221098234U CN 217585267 U CN217585267 U CN 217585267U
- Authority
- CN
- China
- Prior art keywords
- fly ash
- rotary kiln
- unit
- counter
- treatment system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The application discloses a fly ash treatment system for a counter-current rotary kiln system, wherein the counter-current rotary kiln system comprises a counter-current rotary kiln, a secondary combustion chamber, a waste heat boiler, a quench tower and a bag-type dust remover which are sequentially connected; the fly ash treatment system comprises a fly ash washing unit, a dehydration unit, a plasma gasification furnace and an inorganic salt extraction unit; the fly ash washing unit is connected with one or more fly ash outlets of the countercurrent rotary kiln, the secondary combustion chamber, the waste heat boiler, the quench tower and the bag-type dust remover and is used for washing and desalting fly ash from the fly ash outlets; the dehydration unit is connected with the fly ash washing unit and is used for dehydrating the fly ash after washing and desalting; the plasma gasification furnace is connected with the dehydration unit and is used for carrying out high-temperature melting on the dehydrated fly ash; the inorganic salt extraction unit is connected with the dehydration unit and is used for extracting inorganic salt from the water removed by the dehydration unit. According to the fly ash treatment system, the harmless treatment of the fly ash can be realized, and the utilization rate of resources is improved.
Description
Technical Field
The application relates to the technical field of harmless treatment of hazardous wastes, in particular to a fly ash treatment system for a counter-current rotary kiln system.
Background
The hazardous waste is classified into hazardous waste listed in national hazardous waste list or hazardous waste identification standard and identification method according to national regulations, and the important point is that the waste incineration fly ash belongs to hazardous waste.
Most of fly ashes in waste incineration plants and hazardous waste incineration plants in our country are landfilled after chelation and solidification, and part of fly ashes are cooperatively disposed by using a cement kiln, so that the problems of land resource waste and the like exist.
Improvements are therefore needed to at least partially address the above problems.
SUMMERY OF THE UTILITY MODEL
A series of concepts in a simplified form are introduced in the summary section, which will be described in further detail in the detailed description section. The inventive content of the present application does not imply any attempt to define the essential features and characteristics of the claimed solution, nor does it imply any attempt to determine the scope of the claimed solution.
To at least partially address the above issues, the present invention provides a fly ash treatment system for a counter-current rotary kiln system.
The countercurrent rotary kiln system comprises an countercurrent rotary kiln, a secondary combustion chamber, a waste heat boiler, a quench tower and a bag-type dust remover which are sequentially connected;
the fly ash treatment system comprises a fly ash washing unit, a dehydration unit, a plasma gasification furnace and an inorganic salt extraction unit;
the fly ash washing unit is connected with one or more fly ash outlets of the countercurrent rotary kiln, the secondary combustion chamber, the waste heat boiler, the quenching tower and the bag-type dust remover and is used for washing and desalting the fly ash from the fly ash outlets;
the dehydration unit is connected with the fly ash washing unit and is used for dehydrating the fly ash after water washing and desalting;
the plasma gasification furnace is connected with the dehydration unit and is used for carrying out high-temperature melting on the dehydrated fly ash;
the inorganic salt extraction unit is connected with the dehydration unit and is used for extracting inorganic salt from the water removed by the dehydration unit.
Illustratively, the fly ash water wash unit includes a water wash tank.
Illustratively, the dewatering unit includes a multi-stage dewaterer.
Illustratively, the inorganic salt extraction unit comprises a reaction settling tank and a mechanical compression evaporator;
the reaction sedimentation tank is connected with the dehydration unit and is used for removing one or more of heavy metal, calcium ions and suspended solid from the water removed by the dehydration unit;
the mechanical compression evaporator is connected with the reaction sedimentation tank and is used for separating inorganic salt from water from the reaction sedimentation tank.
Illustratively, the mechanical compression evaporator is connected to the fly ash scrubbing unit for delivering evaporated water to the fly ash scrubbing unit.
Exemplarily, the countercurrent rotary kiln system further comprises a wet tower, an induced draft fan and a chimney which are connected in sequence;
the wet tower is connected with the bag-type dust collector.
Exemplarily, a flue gas heater is arranged between the wet method tower and the induced draft fan.
Illustratively, the plasma gasification furnace is connected with the secondary combustion chamber and is used for conveying the flue gas of the plasma gasification furnace to the secondary combustion chamber.
According to the fly ash treatment system of the utility model, inorganic salt can be extracted from fly ash in a countercurrent rotary kiln system, and the inorganic salt can be used as raw material and agricultural fertilizer in the chlor-alkali industry; the high-temperature melting of the desalted fly ash can be carried out through the plasma gasification furnace to obtain a vitreous body, the vitreous body can be used as a building material, the harmless treatment of the fly ash is realized, the full utilization of resources is realized, the landfill treatment of the fly ash is not needed, and the problem of land resource waste is avoided.
Drawings
The following drawings of the present application are included to provide an understanding of the present application. The drawings illustrate embodiments of the application and their description, serve to explain the principles and apparatus of the application. In the drawings, there is shown in the drawings,
fig. 1 is a schematic structural diagram of a fly ash treatment system for a counter-current rotary kiln system according to an embodiment of the present invention.
Description of reference numerals:
the method comprises the following steps of 1-a counter-current rotary kiln, 2-a secondary combustion chamber, 3-a waste heat boiler, 4-a quench tower, 5-a bag-type dust remover, 6-a wet tower, 7-a flue gas heater, 8-an induced draft fan, 9-a chimney, 10-a fly ash washing unit, 11-a dehydration unit, 12-a reaction sedimentation tank, 13-a mechanical compression evaporator and 14-a plasma gasification furnace.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art, that the present application may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application.
It is to be understood that the present application is capable of implementation in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.
Spatial relational terms such as "under," "below," "under," "above," "over," and the like may be used herein for convenience in describing the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
Embodiments of the invention are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the application. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the present application should not be limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the present application.
A fly ash treatment system for a counter-current rotary kiln system according to an embodiment of the present invention is illustrated with reference to fig. 1.
The countercurrent rotary kiln system comprises an countercurrent rotary kiln 1, a secondary combustion chamber 2, a waste heat boiler 3, a quench tower 4 and a bag-type dust remover 5 which are connected in sequence. The countercurrent rotary kiln 1 is a coarse and short type countercurrent rotary kiln, the flow direction of flue gas is opposite to the movement direction of materials, the flow velocity of flue gas in the kiln is low, the materials with large ash content can be treated, and the abrasion to castable on the inner wall of the rotary kiln is small. The temperature in the counter-current rotary kiln 1 is about 850 ℃, and liquid, solid, semi-solid and gas materials can be treated. The countercurrent rotary kiln 1 comprises a feed inlet, a flue gas outlet, a slag outlet, a fly ash outlet, a primary air inlet and a secondary air inlet. The flue gas outlet of the countercurrent rotary kiln 1 is connected with the flue gas inlet of the secondary combustion chamber 2 through a flue, and the flue gas generated by the countercurrent rotary kiln enters the secondary combustion chamber 2 for secondary combustion to further destroy harmful components. The second combustion chamber 2 can be a zigzag long second combustion chamber. The secondary combustion chamber 2 also comprises a fuel gas inlet, a fly ash outlet and a flue gas outlet, wherein the fuel gas inlet is used for introducing fuel gas such as natural gas for afterburning, the fly ash outlet can be arranged at the bottom of the secondary combustion chamber 2, the flue gas outlet of the secondary combustion chamber 2 is connected with the flue gas inlet of the waste heat boiler 3 through a flue, and the temperature of flue gas discharged from the flue gas outlet of the secondary combustion chamber 2 is about 1100 ℃. The waste heat boiler 3 is used for recovering the waste heat of the flue gas, and further comprises a flue gas outlet and a fly ash outlet arranged at the bottom of the waste heat boiler 3, the flue gas outlet of the waste heat boiler 3 is connected with the flue gas inlet of the quench tower 4 through a flue, and the temperature of the flue gas discharged from the flue gas outlet of the waste heat boiler 3 is about 550 ℃. The quenching tower 4 rapidly cools the flue gas through the atomizing spray gun arranged on the quenching tower so as to reduce the generation of dioxin. The quenching tower 4 further comprises a flue gas outlet and a fly ash outlet arranged at the bottom of the quenching tower 4. The flue gas outlet of the quenching tower 4 is connected with the flue gas inlet of the bag-type dust collector 5 through a flue. A dry deacidification system can be arranged between the quenching tower 4 and the bag-type dust collector 5, the deacidification medium can be activated carbon and/or baking soda, and the acidic pollutants in the flue gas can be removed by utilizing the adsorbability of the activated carbon and/or the baking soda. The bag-type dust collector 5 is used for collecting dust from flue gas, and further comprises a flue gas outlet and a fly ash outlet arranged at the bottom of the bag-type dust collector 5. In some embodiments, the flue gas exiting the flue gas outlet of the bag house dust collector 5 may be exhausted through a device such as a chimney.
In this embodiment, the countercurrent rotary kiln system further includes a wet process tower 6, a flue gas heater 7, an induced draft fan 8 and a chimney 9, and the bag-type dust collector 5, the wet process tower 6, the flue gas heater 7, the induced draft fan 8 and the chimney 9 are connected in sequence through a flue. The wet tower 6 is used for wet desulphurization of the flue gas, the temperature of the flue gas from the bag-type dust remover 5 is about 175 ℃, and the temperature of the flue gas from the wet tower 6 is about 70 ℃. The flue gas heater 7 is used for heating flue gas, can heat the flue gas temperature to be higher than dew point temperature, for example can heat the flue gas to about 140 ℃ from about 70 ℃, so both can get rid of white, can reduce the possibility of corroding draught fan 8 and chimney 9 again. The flue gas heated by the flue gas heater 7 is discharged through a chimney 9 under the action of the induced draft fan 8. In some embodiments, the flue gas heater 7 may not be provided, and the wet tower 6 is directly connected with the induced draft fan 8 through a flue.
The fly ash treatment system comprises a fly ash water washing unit 10, a dehydration unit 11, a plasma gasification furnace 14 and an inorganic salt extraction unit. The fly ash washing unit 10 is connected with fly ash outlets in the counter-current rotary kiln 1, the secondary combustion chamber 2, the waste heat boiler 3, the quench tower 4 and the bag-type dust remover 5 and is used for washing and desalting fly ash from the fly ash outlets. The fly ash washing unit 10 can comprise a washing tank, the fly ash contains more soluble inorganic salts such as NaCl and KCl, and the fly ash is stirred and washed in the washing tank, so that the salt in the fly ash can be fully washed and dissolved in water. The dehydration unit 11 is connected to the fly ash washing unit 10, and dehydrates the fly ash after washing and desalting, so that the salt-containing water and the fly ash after desalting are separated, and the salt in the fly ash can be further dissolved in the water in the dehydration process. The dewatering unit 11 may comprise a multi-stage dewatering machine or other suitable dewatering device. The plasma gasification furnace 14 is connected with the dehydration unit 11, the dehydrated fly ash is input into the plasma gasification furnace 14, the plasma gasification furnace 14 carries out high-temperature melting on the dehydrated fly ash, the fly ash can be melted in the ion gasification furnace at the temperature of about 1500 ℃ to obtain a vitreous body, the vitreous body can be used as a building material, landfill is not needed, and waste of land resources is avoided. The toxic and harmful substances in the fly ash are completely decomposed in the plasma gasification furnace 14 through the high temperature action. The plasma gasification furnace 14 and the secondary combustion chamber 2 can be connected through a flue so as to convey high-temperature flue gas of about 1250 ℃ generated by the plasma gasification furnace 14 to the secondary combustion chamber 2, so as to improve the temperature of the secondary combustion chamber 2, thereby effectively reducing the consumption of fuel gas for afterburning in the secondary combustion chamber 2 and realizing energy conservation and consumption reduction. The flue gas generated by the plasma gasification furnace 14 is treated by a counter-current rotary kiln system and then discharged. The inorganic salt extraction unit is connected to the dehydration unit 11 for extracting inorganic salts (e.g., naCl and KCl) from the water removed by the dehydration unit 11. The inorganic salt extraction element includes reaction sedimentation tank 12 and mechanical compression evaporimeter 13, reaction sedimentation tank 12 with dehydration unit 11 is connected, and the water input reaction sedimentation tank 12 of dehydration unit 11 desorption, reaction sedimentation tank 12 are followed through pretreatment technologies such as coagulating sedimentation and absorption in the aquatic of dehydration unit 11 desorption get rid of one or more in heavy metal, calcium ion, the suspended solid, and the suspended solid can include the organic matter. The mechanical compression evaporator 13 is connected with the reaction sedimentation tank 12, and is used for carrying out mechanical compression evaporation (MVR) on water from the reaction sedimentation tank 12 and separating concentrated inorganic salt (such as NaCl and KCl) from the water, wherein the inorganic salt can be used as raw materials and agricultural fertilizers in the chlor-alkali industry. The mechanical compression evaporator 13 is also connected with the fly ash washing unit 10, and conveys the evaporated water to the fly ash washing unit 10, thereby realizing the recycling of the water.
The fly ash treatment system of the embodiment can extract inorganic salt from fly ash in a reverse-flow rotary kiln system, and the inorganic salt can be used as raw materials and agricultural fertilizers in the chlor-alkali industry; and the high-temperature melting can be carried out on the fly ash after the desalting by the plasma gasification furnace 14 to obtain a vitreous body, the vitreous body can be used as a building material, the harmless treatment of the fly ash is realized, the full utilization of resources is realized, the landfill treatment of the fly ash is not needed, and the problem of land resource waste is avoided.
Although the example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above-described example embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the present application, various features of the present application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present application should not be construed to reflect the intent: this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (8)
1. A fly ash treatment system for a counter-current rotary kiln system is characterized in that,
the countercurrent rotary kiln system comprises an countercurrent rotary kiln, a secondary combustion chamber, a waste heat boiler, a quench tower and a bag-type dust remover which are sequentially connected;
the fly ash treatment system comprises a fly ash washing unit, a dehydration unit, a plasma gasification furnace and an inorganic salt extraction unit;
the fly ash washing unit is connected with one or more fly ash outlets of the countercurrent rotary kiln, the secondary combustion chamber, the waste heat boiler, the quenching tower and the bag-type dust remover and is used for washing and desalting the fly ash from the fly ash outlets;
the dehydration unit is connected with the fly ash washing unit and is used for dehydrating the fly ash after water washing and desalting;
the plasma gasification furnace is connected with the dehydration unit and is used for carrying out high-temperature melting on the dehydrated fly ash;
the inorganic salt extraction unit is connected with the dehydration unit and is used for extracting inorganic salt from the water removed by the dehydration unit.
2. A fly ash treatment system for a counter-current rotary kiln system according to claim 1,
the fly ash washing unit comprises a washing tank.
3. A fly ash treatment system for a counter-current rotary kiln system according to claim 1,
the dehydration unit includes a multistage dehydrator.
4. A fly ash treatment system for a counter-current rotary kiln system according to claim 1,
the inorganic salt extraction unit comprises a reaction sedimentation tank and a mechanical compression evaporator;
the reaction sedimentation tank is connected with the dehydration unit and is used for removing one or more of heavy metal, calcium ions and suspended solid from the water removed by the dehydration unit;
the mechanical compression evaporator is connected with the reaction sedimentation tank and is used for separating inorganic salt from water from the reaction sedimentation tank.
5. A fly ash treatment system for a counter-current rotary kiln system according to claim 4,
the mechanical compression evaporator is connected with the fly ash washing unit and is used for conveying evaporated water to the fly ash washing unit.
6. A fly ash treatment system for a counter-current rotary kiln system according to claim 1,
the countercurrent rotary kiln system also comprises a wet tower, an induced draft fan and a chimney which are connected in sequence;
the wet tower is connected with the bag-type dust collector.
7. A fly ash treatment system for a counter-current rotary kiln system according to claim 6,
and a flue gas heater is arranged between the wet tower and the induced draft fan.
8. A fly ash treatment system for a counter-current rotary kiln system according to claim 1,
the plasma gasification furnace is connected with the second combustion chamber and is used for conveying the flue gas of the plasma gasification furnace to the second combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221098234.0U CN217585267U (en) | 2022-05-06 | 2022-05-06 | Fly ash treatment system for counter-current rotary kiln system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221098234.0U CN217585267U (en) | 2022-05-06 | 2022-05-06 | Fly ash treatment system for counter-current rotary kiln system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217585267U true CN217585267U (en) | 2022-10-14 |
Family
ID=83551529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221098234.0U Active CN217585267U (en) | 2022-05-06 | 2022-05-06 | Fly ash treatment system for counter-current rotary kiln system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217585267U (en) |
-
2022
- 2022-05-06 CN CN202221098234.0U patent/CN217585267U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108480360B (en) | Method for recycling fly ash resources and discharging tail gas in ultra-clean mode by melting method of rotary kiln | |
| CN108237143B (en) | Low-energy consumption organic contaminated soil ex-situ thermal desorption process | |
| CN102276130B (en) | Sludge resource treatment apparatus and sludge treatment method using the same | |
| WO2022061958A1 (en) | Harmless and resourceful integrated treatment method and system for oil sludge | |
| CN106007297B (en) | Mercury-containing sludge heat treatment method | |
| WO2008128465A1 (en) | System and progress for treating wet sludge by drying and incinerating | |
| CN113175675B (en) | Organic waste comprehensive treatment production line and method | |
| CN103420549B (en) | Harmless waste treatment method in coal chemical industry | |
| CN109201701A (en) | A kind of waste gas treatment process applied to domestic garbage treating system | |
| CN206051812U (en) | A kind of mercury-containing sludge annealing device | |
| CN107129816A (en) | A kind of house refuse cracking treatment process | |
| CN113353956A (en) | System and method for co-processing fly ash by washing and desalting and combining with cement kiln | |
| CN104150732A (en) | Two-stage sludge drying system | |
| CN113121082A (en) | Device and method for resource utilization and harmless treatment of oily sludge | |
| CN106854031B (en) | Sludge recycling treatment method and treatment system thereof | |
| CN208536004U (en) | Utilize the sludge at low temperature anhydration and incineration device of fume afterheat | |
| CN105236376A (en) | Glyphosate mother liquor resource utilization system | |
| CN217585267U (en) | Fly ash treatment system for counter-current rotary kiln system | |
| CN109608012A (en) | Waste tyre pyrolytic new energy heats air desiccation sewage plant sludge Processes and apparatus | |
| CN215404018U (en) | Organic waste comprehensive treatment, recovery and reuse production line | |
| CN112676318B (en) | Resource utilization method for household garbage | |
| CN2702185Y (en) | Sludge burning treating apparatus | |
| CN104329676A (en) | Fluidized bed sludge incineration system and processing method | |
| CN211345325U (en) | System for organic solid waste incineration melting innocent treatment | |
| CN213475732U (en) | Sludge deep dehydration coupling biomass pyrolysis system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |