Fly ash salt separation pilot plant test equipment

Abstract

The utility model relates to the technical field of fly ash recycling, and discloses fly ash salt separation pilot plant test equipment which comprises a fly ash pretreatment system, an evaporation system and a salt outlet system which are connected in sequence, wherein the fly ash pretreatment system is used for carrying out water washing and hardness removal treatment on fly ash, and the evaporation system is used for carrying out evaporative crystallization on pretreated water washing liquid; the salt outlet system comprises a thickener, a first centrifugal unit, a freezing unit, a second centrifugal unit and a spray drying unit which are connected in sequence; and the salt discharging system is used for performing salt separation treatment to obtain first crystal salt, second crystal salt and carnallite. The fly ash pretreatment system is used for carrying out water washing and hardness removal treatment on fly ash, the evaporation system is used for carrying out evaporative crystallization on pretreated water washing liquid, and the salt outlet system is used for carrying out solid-liquid separation on a crystal slurry mixture, so that the fly ash salt separation pilot plant test equipment is provided, industrial salt in the fly ash is recycled, and the production cost is reduced. And reduction, harmlessness and recycling of fly ash treatment are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash recovery and utilization, in particular to a fly ash salt separation pilot equipment. Background Art

[0002] Currently, the disposal methods for fly ash from hazardous waste incineration, secondary fly ash from hazardous waste plasma melting, and municipal solid waste incineration are relatively limited. Landfill is generally considered the most mature, stable, and technically feasible method. However, landfilling has the disadvantages of high technical requirements, large land occupation, and extremely high construction and operating costs. Municipal solid waste fly ash is rich in elements and components such as potassium, sodium, and calcium, all of which can be comprehensively utilized as raw materials. However, the aforementioned treatment methods cannot effectively recycle the fly ash.

[0003] Therefore, how to provide a fly ash salt separation pilot equipment to recycle fly ash as a resource has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a fly ash salt separation pilot equipment to recycle and utilize fly ash as a resource.

[0005] To this end, according to a first aspect, an embodiment of the present utility model discloses a fly ash salt separation pilot plant, comprising: a fly ash pretreatment system, an evaporation system, and a salt output system connected in sequence;

[0006] The fly ash pretreatment system performs water washing and hardness removal treatment on the fly ash, and the evaporation system is used to evaporate and crystallize the pretreated water washing liquid;

[0007] The salt-discharging system includes a thickener, a first centrifugal unit, a freezing unit, a second centrifugal unit, and a spray drying unit connected in sequence; the thickener and the first centrifugal unit are used to perform solid-liquid separation on the slurry mixture treated by the evaporation system to obtain first crystalline salt; the freezing unit is used to perform freeze crystallization on the centrifugal liquid treated by the first centrifugal unit, and the second centrifugal unit is used to perform solid-liquid separation on the slurry mixture discharged from the freezing unit to obtain second crystalline salt;

[0008] The spray drying unit is used to dry the centrifugal liquid after the second centrifugal unit has been centrifuged to obtain the impurity salts.

[0009] The present invention is further configured such that the freezing unit includes a refrigeration unit and a freezing kettle connected to each other, the second centrifugal unit is a freezing filtration tank, the refrigeration unit is used to provide freezing liquid to the freezing kettle, and the freezing filtration tank is used to perform solid-liquid separation on the slurry mixture after freezing and crystallization of the freezing kettle to obtain a second crystalline salt.

[0010] The present invention is further configured such that the freezing unit also includes a second mother liquid tank and a second mother liquid pump, one end of the second mother liquid tank is connected to the freezing filtration tank, and the other end of the second mother liquid tank is connected to the second mother liquid pump, and the second mother liquid pump is used to provide the centrifuged mother liquid in the second mother liquid tank to the evaporation system.

[0011] The present invention is further configured as follows: the fly ash pretreatment system includes a water washing reaction tank, a water washing pretreatment filter tank, a hardness removal reaction tank and a hardness removal filter tank connected in sequence; the water washing reaction tank is used to wash the fly ash; the water washing pretreatment filter tank is used to filter the washing liquid; the hardness removal reaction tank is used to remove hardness from the washing liquid filtered by the water washing pretreatment filter tank; the hardness removal filter tank is used to filter the washing liquid after hardness removal; and the evaporation system is used to evaporate and crystallize the filtrate filtered by the hardness removal filter tank.

[0012] The utility model is further configured such that the fly ash pretreatment system also includes a distilled water cooler and a preheater, the distilled water cooler is respectively connected to the water washing reaction tank, the evaporation system and the preheater, and the preheater is used to preheat the filtrate filtered after the hardness removal filter tank is filtered.

[0013] The present invention is further configured such that a feed buffer tank is installed between the hardness removal filter tank and the preheater.

[0014] The present invention is further configured such that the salt output system further includes a first mother liquid tank and a first mother liquid pump, wherein the first mother liquid tank is connected to the first centrifugal unit, and the first mother liquid pump is used to provide the centrifuged mother liquid in the first mother liquid tank to the evaporation system.

[0015] The present invention is further configured such that the first centrifugal unit is a first filtration tank.

[0016] The utility model is further configured such that the evaporation system includes a compressor, a distilled water tank, a heater and a separator which are connected in a circular manner in sequence, the compressor is also connected to the heater, the separator is connected to a steam generator and a crystallization kettle, and the separator and the crystallization kettle are used to evaporate and crystallize the pretreated water washing liquid.

[0017] The present invention is further configured such that a distilled water pump is installed between the compressor and the distilled water tank, a first circulating pump is installed between the heater and the separator, and a second circulating pump is installed between the separator and the crystallization kettle.

[0018] The utility model has the following beneficial effects: the fly ash is washed and hardened by the fly ash pretreatment system, the evaporation system is used to evaporate and crystallize the pretreated washing liquid, and the salt output system performs solid-liquid separation on the slurry mixture, thereby providing a fly ash salt separation pilot equipment, recovering the industrial salt therein, and realizing the reduction, harmlessness and resource utilization of fly ash treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of a fly ash salt separation pilot plant disclosed in this embodiment;

[0021] Figure 2 This is a schematic structural diagram of a fly ash pretreatment system in a fly ash salt separation pilot plant disclosed in this embodiment;

[0022] Figure 3 This is a partial structural diagram of a fly ash salt separation pilot plant disclosed in this embodiment;

[0023] Figure 4 This is a schematic structural diagram of a refrigeration unit in a fly ash salt separation pilot plant disclosed in this embodiment;

[0024] Figure 5 This is a schematic flow diagram of a fly ash salt separation pilot plant disclosed in this embodiment.

[0025] Figure numerals: 10, fly ash pretreatment system; 11, water washing reaction tank; 12, water washing pretreatment filter tank; 13, hardness removal reaction tank; 14, hardness removal filter tank; 15, distilled water cooler; 16, preheater; 17, feed buffer tank; 20, evaporation system; 21, compressor; 22, distilled water tank; 23, heater; 24, separator; 25, steam generator; 26, crystallization kettle; 27, distilled water pump; 28, first circulation pump; 29, second circulation pump; 30, salt output system; 31, thickener; 32, first centrifugal unit; 321, first mother liquor tank; 322, first mother liquor pump; 33, freezing unit; 331, refrigeration unit; 332, freezing kettle; 333, second mother liquor tank; 334, second mother liquor pump; 34, second centrifugal unit; 35, spray drying unit. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal connections between two components; they may refer to wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] The present invention discloses a pilot plant for separating salt from fly ash. Figure 1-5 As shown, it includes: a fly ash pretreatment system 10, an evaporation system 20 and a salt output system 30 connected in sequence;

[0031] The fly ash pretreatment system 10 performs water washing and hardness removal treatment on the fly ash, and the evaporation system 20 is used to evaporate and crystallize the pretreated washing liquid;

[0032] The salt output system 30 includes a thickener 31, a first centrifugal unit 32, a freezing unit 33, a second centrifugal unit 34 and a spray drying unit 35 connected in sequence; the thickener 31 and the first centrifugal unit 32 are used to perform solid-liquid separation on the slurry mixture after the evaporation system 20 is processed to obtain first crystalline salt; the freezing unit 33 is used to freeze and crystallize the centrifugal liquid after the centrifugal treatment of the first centrifugal unit 32, and the second centrifugal unit 34 is used to perform solid-liquid separation on the slurry mixture discharged from the freezing unit 33 to obtain second crystalline salt;

[0033] The spray drying unit 35 is used to dry the centrifugal liquid after the centrifugal treatment in the second centrifugal unit 34 to obtain miscellaneous salts.

[0034] It should be noted that the fly ash is washed and de-hardened by the fly ash pretreatment system 10, the evaporation system 20 is used to evaporate and crystallize the pretreated washing liquid, and the salt output system 30 performs solid-liquid separation on the slurry mixture, thereby providing a fly ash salt separation pilot equipment, recovering the industrial salt therein, and realizing the reduction, harmlessness and resource utilization of fly ash treatment.

[0035] like Figure 1 and Figure 4 As shown, the freezing unit 33 includes a refrigeration unit 331 and a freezing kettle 332 that are interconnected. The second centrifugal unit 34 is a freezing filtration tank. The refrigeration unit 331 is used to provide freezing liquid to the freezing kettle 332. The freezing filtration tank is used to perform solid-liquid separation on the slurry mixture after freezing and crystallization in the freezing kettle 332 to obtain a second crystalline salt.

[0036] like Figure 1 and Figure 4 As shown, the freezing unit 33 further includes a second mother liquid tank 333 and a second mother liquid pump 334. One end of the second mother liquid tank 333 is connected to the freezing filtration tank, and the other end of the second mother liquid tank 333 is connected to the second mother liquid pump 334. The second mother liquid pump 334 is used to provide the centrifuged mother liquid in the second mother liquid tank 333 to the evaporation system 20. It should be noted that the centrifuged mother liquid after filtering in the freezing filtration tank is discharged into the second mother liquid tank 333, and the second mother liquid pump 334 is connected to the separator 24.

[0037] like Figure 1 and Figure 2 As shown, the fly ash pretreatment system 10 includes a water washing reaction tank 11, a water washing pretreatment filter tank 12, a hardness removal reaction tank 13, and a hardness removal filter tank 14, which are connected in sequence. The water washing reaction tank 11 is used to wash the fly ash, the water washing pretreatment filter tank 12 is used to filter the washing liquid, the hardness removal reaction tank 13 is used to remove hardness from the washing liquid filtered by the water washing pretreatment filter tank 12, and the hardness removal filter tank 14 is used to filter the washing liquid after hardness removal. The evaporation system 20 is used to evaporate and crystallize the filtrate filtered by the hardness removal filter tank 14. In the specific implementation process, the material transfer of the fly ash pretreatment system 10 is all carried out through the material transfer pump.

[0038] like Figure 1 and Figure 2As shown, the fly ash pretreatment system 10 further includes a distilled water cooler 15 and a preheater 16. The distilled water cooler 15 is connected to the water washing reaction tank 11, the evaporation system 20, and the preheater 16, respectively. The preheater 16 is used to preheat the filtrate after filtering through the hardness removal filter tank 14. It should be noted that preheating the filtrate after filtering through the hardness removal filter tank 14 by the preheater 16 increases the evaporation crystallization yield of the evaporation system 20.

[0039] like Figure 1 and Figure 2 As shown, a feed buffer tank 17 is installed between the hard filter tank 14 and the preheater 16. It should be noted that, through the provision of the feed buffer tank 17, the pretreated filtrate can be temporarily stored to ensure the smooth operation of the system.

[0040] like Figure 1-3 As shown, the salt output system 30 further includes a first mother liquid tank 321 and a first mother liquid pump 322. The first mother liquid tank 321 is connected to the first centrifugal unit 32. The first mother liquid pump 322 is used to provide the centrifuged mother liquid in the first mother liquid tank 321 to the evaporation system 20. In a specific implementation, the first mother liquid pump 322 is connected to the separator 24.

[0041] like Figure 1-3 As shown, the first centrifugal unit 32 is a first suction filtration tank. It should be noted that, through the provision of the first suction filtration tank, the slurry mixture is subjected to solid-liquid separation to obtain the centrifugal mother liquor and the first crystal salt.

[0042] like Figure 1 and Figure 3 As shown, the evaporation system 20 includes a compressor 21, a distilled water tank 22, a heater 23, and a separator 24 that are connected in a circular manner. The compressor 21 is also connected to the heater 23. The separator 24 is connected to a steam generator 25 and a crystallization kettle 26. The separator 24 and the crystallization kettle 26 are used to evaporate and crystallize the pretreated water washing liquid. In the specific implementation process, the crystallization kettle 26 is connected to the first suction filtration tank.

[0043] like Figure 1 and Figure 3 As shown, a distilled water pump 27 is installed between the compressor 21 and the distilled water tank 22, a first circulation pump 28 is installed between the heater 23 and the separator 24, and a second circulation pump 29 is installed between the separator 24 and the crystallization kettle 26. The arrangement of the first circulation pump 28 and the second circulation pump 29 ensures the recycling of materials to achieve a higher yield of crystal salt.

[0044] Working principle: The fly ash is washed and hardened by the fly ash pretreatment system 10, the evaporation system 20 is used to evaporate and crystallize the pretreated washing liquid, and the salt output system 30 performs solid-liquid separation on the slurry mixture, thereby providing a fly ash salt separation pilot equipment, recovering the industrial salt therein, and realizing the reduction, harmlessness and resource utilization of fly ash treatment.

[0045] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A fly ash salt separation pilot plant, characterized in that: include: A fly ash pretreatment system (10), an evaporation system (20), and a salt output system (30) connected in sequence; The fly ash pretreatment system (10) performs water washing and hardness removal treatment on the fly ash, and the evaporation system (20) is used to evaporate and crystallize the pretreated water washing liquid; The salt output system (30) comprises a thickener (31), a first centrifugal unit (32), a freezing unit (33), a second centrifugal unit (34) and a spray drying unit (35) connected in sequence; the thickener (31) and the first centrifugal unit (32) are used to perform solid-liquid separation on the slurry mixture after being processed by the evaporation system (20) to obtain first crystalline salt; the freezing unit (33) is used to perform freeze crystallization on the centrifugal liquid after being centrifuged by the first centrifugal unit (32); the second centrifugal unit (34) is used to perform solid-liquid separation on the slurry mixture discharged from the freezing unit (33) to obtain second crystalline salt; The spray drying unit (35) is used to dry the centrifugal liquid after the centrifugal treatment of the second centrifugal unit (34) to obtain impurity salts.

2. The fly ash salt separation pilot plant according to claim 1, characterized in that: The freezing unit (33) includes a refrigeration unit (331) and a freezing kettle (332) connected to each other, and the second centrifugal unit (34) is a freezing filtration tank. The refrigeration unit (331) is used to provide freezing liquid to the freezing kettle (332), and the freezing filtration tank is used to perform solid-liquid separation on the slurry mixture after freezing and crystallization in the freezing kettle (332) to obtain a second crystalline salt.

3. The fly ash salt separation pilot plant according to claim 2, characterized in that: The freezing unit (33) further includes a second mother liquid tank (333) and a second mother liquid pump (334), one end of the second mother liquid tank (333) is connected to the freezing filtration tank, and the other end of the second mother liquid tank (333) is connected to the second mother liquid pump (334), and the second mother liquid pump (334) is used to provide the centrifuged mother liquid in the second mother liquid tank (333) to the evaporation system (20).

4. The fly ash salt separation pilot plant according to any one of claims 1 to 3, characterized in that: The fly ash pretreatment system (10) comprises a water washing reaction tank (11), a water washing pretreatment filter tank (12), a hardness removal reaction tank (13) and a hardness removal filter tank (14) which are connected in sequence, wherein the water washing reaction tank (11) is used for washing the fly ash, the water washing pretreatment filter tank (12) is used for filtering the washing liquid, the hardness removal reaction tank (13) is used for removing hardness from the washing liquid filtered by the water washing pretreatment filter tank (12), the hardness removal filter tank (14) is used for filtering the washing liquid after hardness removal, and the evaporation system (20) is used for evaporating and crystallizing the filtrate filtered by the hardness removal filter tank (14).

5. The fly ash salt separation pilot plant according to claim 4, characterized in that: The fly ash pretreatment system (10) further includes a distilled water cooler (15) and a preheater (16), wherein the distilled water cooler (15) is respectively connected to the water washing reaction tank (11), the evaporation system (20) and the preheater (16), and the preheater (16) is used to preheat the filtrate filtered by the hardness removal filter tank (14).

6. The fly ash salt separation pilot plant according to claim 5, characterized in that: A feed buffer tank (17) is installed between the hardness removal filter tank (14) and the preheater (16).

7. The fly ash salt separation pilot plant according to claim 1, characterized in that: The salt output system (30) further includes a first mother liquid tank (321) and a first mother liquid pump (322), wherein the first mother liquid tank (321) is connected to the first centrifugal unit (32), and the first mother liquid pump (322) is used to provide the centrifuged mother liquid in the first mother liquid tank (321) to the evaporation system (20).

8. The fly ash salt separation pilot plant according to claim 1 or 7, characterized in that: The first centrifugal unit (32) is a first suction filtration tank.

9. The fly ash salt separation pilot plant according to any one of claims 1 to 3, characterized in that: The evaporation system (20) comprises a compressor (21), a distilled water tank (22), a heater (23) and a separator (24) which are cyclically connected in sequence. The compressor (21) is also connected to the heater (23). The separator (24) is connected to a steam generator (25) and a crystallization kettle (26). The separator (24) and the crystallization kettle (26) are used to evaporate and crystallize the pretreated water washing liquid.

10. The fly ash salt separation pilot plant according to claim 9, characterized in that: A distilled water pump (27) is installed between the compressor (21) and the distilled water tank (22), a first circulation pump (28) is installed between the heater (23) and the separator (24), and a second circulation pump (29) is installed between the separator (24) and the crystallization kettle (26).

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