CN214990733U

CN214990733U - Domestic waste incineration fly ash washing liquid pretreatment system

Info

Publication number: CN214990733U
Application number: CN202023291589.5U
Authority: CN
Inventors: 邹亚波; 贺克明; 孙士顺; 邹洪波
Original assignee: Beijing Anyutong Environment Engineering & Technology Co ltd
Current assignee: Beijing Anyutong Environment Engineering & Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-12-03
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a domestic waste burns flying dust washing liquid pretreatment systems, including heavy metal remove device and decalcification decarbonization device, one side of heavy metal remove device is provided with the sodium sulfide reaction tank, the opposite side fixed connection of first flocculation groove is in one side of first clarifier, the opposite side fixed connection of first clarifier is in one side of first clarifier, one side of decalcification decarbonization device is provided with the sodium carbonate reaction tank, the opposite side fixed connection of second clarifier is in one side of second clarifier. Through the setting of heavy metal remove device and decalcification decarbonization device two-stage, can high-efficiently get rid of the impurity in the flying dust washing liquid, through the setting in partial mud extraction to first clarifier and second clarifier, make the washing liquid flocculation reaction complete, be worth wideling popularize.

Description

Domestic waste incineration fly ash washing liquid pretreatment system

Technical Field

The utility model relates to a waste incineration flying ash handles technical field, especially relates to a domestic waste incineration flying ash washing liquid pretreatment systems.

Background

At present, domestic garbage is collected and incinerated in a mixing way, a large amount of fly ash is generated in the incineration process, the fly ash contains high-concentration chlorine elements, a large amount of heavy metal elements and dioxin substances and belongs to dangerous waste, because the chemical composition of the fly ash is similar to that of building materials, the harmless and resource treatment way of the existing fly ash is mainly water washing, namely the collected fly ash is washed after removing dioxin, chlorine salt and heavy metal are washed out, so that the mass percentage of chlorine ions in ash slag is reduced to below 1 percent to meet the concentration requirement of related raw materials, the ash slag is dried and then is fired into cement or used as a production building material, water washing liquid is further treated, concentrated, evaporated and crystallized to separate industrial salt, after the fly ash is washed, water washing liquid is waste water with complex components, high salt and high alkali, and needs to be subjected to a series of physical and chemical treatment, mainly retains sodium, potassium and chloride ions, eliminates other anions and cations, and recovers sodium salt and potassium salt through membrane concentration and evaporation, thereby realizing the purpose of resource utilization.

Two very troublesome problems are urgently needed to be solved when the fly ash is treated in the market, one problem is that the fly ash component fluctuation of the waste incineration is huge, the water quality of fly ash washing liquid is changed greatly, the pretreatment mode effect of adding medicine and precipitating is not ideal, the equipment is not stable to operate, and the agent consumption is large when the two fly ash treatment systems treat water, and meanwhile, the flocculation effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a domestic waste incineration fly ash washing liquid pretreatment system.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a domestic waste burns flying ash washing liquid pretreatment systems, includes heavy metal remove device and decalcification decarbonization device, one side of heavy metal remove device is provided with the sodium sulfide reaction tank, the bottom middle part of sodium sulfide reaction tank runs through the one end at first inlet pipe, the middle part fixed connection of first inlet pipe is on the upper portion of sodium sulfide reaction tank one side outer wall, the opposite side fixed connection of sodium sulfide reaction tank is in one side of ferrous sulfate reaction tank, the opposite side fixed connection of ferrous sulfate reaction tank is in one side of first flocculation vat, the opposite side fixed connection of first flocculation vat is in one side of first clarifier, the opposite side fixed connection of first clarifier is in one side of first clarifier, the upper portion of first clarifier opposite side lateral wall is provided with first gap, first gap is through-going through in one side of carbon dioxide aeration tank through first pipeline, the other side of the carbon dioxide aeration tank is connected with one side of the sedimentation tank through a first pipeline in a through manner, the other side of the sedimentation tank is fixedly connected with one side of the decalcification and decarbonization device through a first pipeline, one side of the decalcification and decarbonization device is provided with a sodium carbonate reaction tank, the middle part of the bottom end of the sodium carbonate reaction tank penetrates through one end of a second feeding pipe, the other end of the second feeding pipe is fixedly connected with the first pipeline, the middle part of the second feeding pipe is fixedly connected with the upper part of the outer wall of one side of the sodium carbonate reaction tank, the other side of the sodium carbonate reaction tank is fixedly connected with one side of an iron chloride reaction tank, the other side of the iron chloride reaction tank is fixedly connected with one side of a second flocculation tank, the other side of the second flocculation tank is fixedly connected with one side of a second clarifier, and the other side of the second clarifier is fixedly connected with one side of the second clarification tank, the upper portion of second depositing reservoir opposite side is provided with the second gap, second gap fixed connection is in the one end of outlet pipe, basin in the middle of the other end fixedly connected with of outlet pipe, the one end middle part that sodium sulfide reaction tank was kept away from to first inlet pipe and the one end middle part that sodium carbonate reaction tank was kept away from to the second inlet pipe all are provided with adjustable weir plate, the equal rotation in middle part of impeller subassembly is connected in the roof middle part of sodium sulfide reaction tank, ferrous sulfate reaction tank, first flocculation tank, sodium carbonate reaction tank, ferric chloride reaction tank and second flocculation tank.

As a further description of the above technical solution:

the other end fixed connection of first inlet pipe is in the one end of conveying pipeline, the other end fixed connection of conveying pipeline is in the bottom middle part of flying ash filtrate groove, one side that the conveying pipeline is close to flying ash filtrate groove is provided with the conveying pump, the interior middle part of flying ash filtrate groove is provided with first stirring leaf, the upper end fixed connection of the upper end fixed connection at the drive end of first motor that the roof middle part and the first stirring leaf of flying ash filtrate groove are run through to the upper end of first stirring leaf.

As a further description of the above technical solution:

the sodium sulfide reaction tank is communicated with the ferrous sulfate reaction tank through a first upper water outlet, the ferrous sulfate reaction tank is communicated with the first flocculation tank through a first lower water outlet, the first flocculation tank is communicated with the first clarifier through a first water inlet pipe, and the first clarifier is communicated with the first clarification tank through a first communication port.

As a further description of the above technical solution:

the one end that has the second pipeline is run through at the bottom middle part of sedimentation tank, the other end fixedly connected with sludge dewaterer of second pipeline, be provided with first mud pump row on the second pipeline, the one end at the fourth pipeline is run through at the bottom middle part of second depositing reservoir, the other end fixed connection of fourth pipeline is on sludge dewaterer, be provided with the second mud pump row on the fourth pipeline.

As a further description of the above technical solution:

first sludge reflux pipe has been run through to one side at first clarification tank bottom middle part, the other end of first sludge reflux pipe runs through diapire one side at first clarifier, one side of first sludge reflux pipe is provided with first sludge pump, the upper end that has the third pipeline is run through at the bottom middle part of first clarification tank, the lower extreme and the second pipeline intercommunication of third pipeline.

As a further description of the above technical solution:

the sodium carbonate reaction tank is communicated with the ferric chloride reaction tank through a second upper water outlet, the ferric chloride reaction tank is communicated with the second flocculation tank through a second lower water outlet, the second flocculation tank is communicated with the second clarifier through a second water inlet pipe, and the second clarifier is communicated with the second clarification tank through a second communication port.

As a further description of the above technical solution:

and a second sludge return pipe penetrates through one side of the middle part of the bottom end of the second clarification tank, the other end of the second sludge return pipe penetrates through one side of the bottom wall of the second clarifier, and a second sludge pump is arranged on one side, close to the second clarification tank, of the second sludge return pipe.

As a further description of the above technical solution:

the top of impeller subassembly all is provided with the second motor, the equal fixed connection of drive end of second motor is in the upper end of puddler, the equal fixedly connected with second stirring leaf in lower part both sides of puddler.

The utility model discloses following beneficial effect has:

1. in the utility model, the two-stage arrangement of the heavy metal removing device and the decalcification and decarbonization device can effectively carry out twice treatment on the fly ash washing liquid, the method can efficiently remove impurities in the fly ash washing liquid, the first-stage heavy metal removing device sequentially adds Na2S, FeSO4 and PAM into water through the arrangement of a sodium sulfide reaction tank, a ferrous sulfate reaction tank and a first flocculation tank from front to back to remove heavy metal ions in the washing liquid, the second-stage decalcification and decarbonization device sequentially adds Na2CO3, FeCl3 and PAM into the water through the arrangement of a sodium carbonate reaction tank, an iron chloride reaction tank and a second flocculation tank from front to back to decalcification and decarbonize the water, meanwhile, the heavy metal removing device and the decalcification and decarbonization device are a water treatment structure integrating mechanical mixing, flocculation, clarification and high-efficiency mixing, so that the washing liquid with poor settleability is well treated.

2. In the utility model, the washing liquid after adding the medicine can be fully mixed by arranging the impeller component in the heavy metal removing device and the decalcification decarbonization device, when the washing liquid reaches the first clarifier, the first clarification tank, the second clarifier and the second clarification tank, the increase of alum floc can be promoted, meanwhile, the first sludge pump can extract partial sludge in the first clarification tank into the first clarifier through the first sludge return pipe, the second sludge pump can extract partial sludge in the second clarification tank into the second clarifier through the second sludge return pipe, under the action, a high-density suspended sludge layer is formed in the mixed water to increase the probability of particle collision, pollutants such as colloid, suspended matters, emulsified oil and metal ions can be effectively adsorbed, the reagent adding amount can be saved by sludge return, and the suspended solid concentration in a reaction zone can be maintained at the optimum level, thereby achieving the purpose of optimizing the flocculation reaction and being worth of great popularization.

Drawings

FIG. 1 is a schematic structural view of a pretreatment system for a fly ash washing liquid from incineration of household garbage;

FIG. 2 is a schematic structural view of a heavy metal removing device of a domestic waste incineration fly ash washing liquid pretreatment system provided by the utility model;

FIG. 3 is a schematic structural view of a decalcification and decarbonization apparatus of a pretreatment system for water washing liquid of fly ash from incineration of household garbage;

fig. 4 is a schematic structural diagram of an impeller assembly of a domestic waste incineration fly ash washing liquid pretreatment system provided by the utility model.

Illustration of the drawings:

1. a fly ash filtrate tank; 2. a sodium sulfide reaction tank; 3. a ferrous sulfate reaction tank; 4. a first flocculation tank; 5. a first clarifier; 6. a first clarification tank; 7. a carbon dioxide aeration tank; 8. a sedimentation tank; 9. a sodium carbonate reaction tank; 10. a ferric chloride reaction tank; 11. a second flocculation tank; 12. a second clarifier; 13. a second clarification tank; 14. an intermediate water tank; 15. a sludge dewatering machine; 16. a heavy metal removal device; 17. a decalcification and decarburization device; 18. a first motor; 19. a first stirring blade; 20. a delivery pump; 21. a first conduit; 22. a first overflow; 23. the weir plate can be adjusted; 24. an impeller assembly; 25. a first upper water outlet; 26. a delivery pipe; 27. a first feed tube; 28. a first lower water outlet; 29. a first water inlet pipe; 30. a first sludge return pipe; 31. a second conduit; 32. a first sludge pump; 33. a first dredge pump; 34. a third pipeline; 35. a second motor; 36. a stirring rod; 37. a second stirring blade; 38. a second upper water outlet; 39. a second lower water outlet; 40. a second water inlet pipe; 41. a second sludge return pipe; 42. a fourth conduit; 43. a second sludge pump; 44. a second sludge discharge pump; 45. a second overflow; 46. a water outlet pipe; 47. a second feed tube; 48. a first communication port; 49. a second communication port.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-4, the present invention provides an embodiment: the utility model provides a domestic waste burns flying dust wash pretreatment systems, including heavy metal remove device 16 and decalcification decarbonization device 17, one side of heavy metal remove device 16 is provided with sodium sulfide reaction tank 2, the bottom middle part of sodium sulfide reaction tank 2 runs through the one end at first inlet pipe 27, the middle part fixed connection of first inlet pipe 27 is on the upper portion of sodium sulfide reaction tank 2 one side outer wall, the opposite side fixed connection of sodium sulfide reaction tank 2 is in one side of ferrous sulfate reaction tank 3, the opposite side fixed connection of ferrous sulfate reaction tank 3 is in one side of first flocculation tank 4, the opposite side fixed connection of first flocculation tank 4 is in one side of first clarifier 5, flying dust wash firstly gets into in sodium sulfide reaction tank 2 through first inlet pipe 27 in heavy metal remove device 16, then successively pass through ferrous sulfate reaction tank 3, first flocculation tank 4, first clarifier 5, First clarifier 6, when the flying ash washing liquid flows through sodium sulfide reaction tank 2, ferrous sulfate reaction tank 3, first flocculation tank 4 in proper order, add Na2S, FeSO4, PAM in the flying ash washing liquid in proper order, then fly ash washing liquid with medicament in impeller subassembly 24 to sodium sulfide reaction tank 2, ferrous sulfate reaction tank 3, first flocculation tank 4 stirs, make medicament and washing liquid can mix rapidly, impeller subassembly 24 adds the mixing velocity of the multiplicable back mixing water of medicament, the opposite side fixed connection of first clarifier 5 is in one side of first clarifier 6, first clarifier 5, first clarifier 6 can make flying ash mixing washing liquid can fully flocculate, first sludge pump 32 can extract partial mud in first clarifier 6 to first clarifier 5 through first sludge return pipe 30 simultaneously, make heavy metal ion in the washing liquid can fully flocculate, ensure that heavy metal ions in the fly ash washing liquid can be fully removed, the unagitated mixed water in the first clarification tank 6 and the first clarifier 5 can promote the increase of alum floc, so that the alum floc is compact and uniform, and under the action of PAM and return sludge, a high-density suspended sludge layer is formed to increase the chance of particle collision, effectively adsorb pollutants such as colloid, suspended matters, emulsified oil, COD (chemical oxygen demand) and metal ions, and the sludge flows back, thereby not only saving the dosage of the medicament, but also maintaining the concentration of suspended solids in a reaction zone at the optimal level, thereby achieving the purpose of optimizing flocculation reaction, the upper part of the side wall at the other side of the first clarification tank 6 is provided with a first overflow port 22, the mixed water overflowing from the first overflow port 22 and after removing the heavy metal ions is added with a certain amount of hydrochloric acid, and the pH value of the mixed water can be adjusted by the hydrochloric acid, so that the mixed water can be processed next step, the first overflow port 22 is connected with one side of the carbon dioxide aeration tank 7 through a first pipeline 21, the other side of the carbon dioxide aeration tank 7 is connected with one side of the sedimentation tank 8 through a first pipeline 21, the sedimentation tank 8 removes flocculation and precipitation substances in the mixed water, the other side of the sedimentation tank 8 is fixedly connected with one side of the decalcification and decarbonization device 17 through a first pipeline 21, one side of the decalcification and decarbonization device 17 is provided with a sodium carbonate reaction tank 9, the middle part of the bottom end of the sodium carbonate reaction tank 9 penetrates through one end of a second feeding pipe 47, the other end of the second feeding pipe 47 is fixedly connected with the first pipeline 21, the middle part of the second feeding pipe 47 is fixedly connected with the upper part of the outer wall of one side of the sodium carbonate reaction tank 9, the other side of the sodium carbonate reaction tank 9 is fixedly connected with one side of an iron chloride reaction tank 10, the other side of the iron chloride reaction tank 10 is fixedly connected with one side of the second flocculation tank 11, the water washing liquid is removed impurities through a carbon dioxide aeration tank 7 and a sedimentation tank 8, then enters a decalcification and decarbonization device 17 through a first pipeline 21, the fly ash water washing liquid firstly enters a sodium carbonate reaction tank 9 through a second feeding pipe 47 in the decalcification and decarbonization device 17, then sequentially passes through an iron chloride reaction tank 10, a second flocculation tank 11, a second clarifier 12 and a second clarification tank 13, when the fly ash water washing liquid sequentially passes through the sodium carbonate reaction tank 9, the iron chloride reaction tank 10 and the second flocculation tank 11, Na2CO3, FeCl3 and PAM are sequentially added into the fly ash water washing liquid, then the fly ash water washing liquid with medicaments in the sodium carbonate reaction tank 9, the iron chloride reaction tank 10 and the second flocculation tank 11 is stirred through an impeller assembly 24, so that the medicaments and the water washing liquid can be rapidly mixed, the removal of a carbon element mixture and a calcium ion mixture in the subsequent flocculation is facilitated, the other side of the second flocculation tank 11 is fixedly connected to one side of the second clarifier 12, the other side of the second clarifier 12 is fixedly connected with one side of the second clarifier 13, the second clarifier 12 and the second clarifier 13 can enable the fly ash mixed washing liquid to be fully flocculated, meanwhile, the second sludge pump 43 can pump partial sludge in the second clarifier 13 into the second clarifier 12 through the second sludge return pipe 41, so that the carbon element compound and the calcium ion mixture in the fly ash washing liquid can be fully flocculated, the fly ash washing liquid can be well treated in the next step, the upper part of the other side of the second clarifier 13 is provided with a second overflow port 45, the washing liquid after being treated in the second overflow port 45 is added with hydrochloric acid, the pH value of the washing liquid is adjusted to be convenient for the next step treatment, the second overflow port 45 is fixedly connected with one end of a water outlet pipe 46, the water outlet pipe 46 leads the completely treated fly ash washing liquid into the middle water tank 14 for the next step treatment, basin 14 in the middle of the other end fixedly connected with of outlet pipe 46, the one end middle part that sodium sulfide reaction tank 2 was kept away from to first inlet pipe 27 and the one end middle part that sodium carbonate reaction tank 9 was kept away from to second inlet pipe 47 all are provided with adjustable weir plate 23, the amount of flying dust wash liquid that adjustable weir plate 23 can control the inflow and flow into sodium sulfide reaction tank 2 and sodium carbonate reaction tank 9, be convenient for control the processing and processing to it, sodium sulfide reaction tank 2, ferrous sulfate reaction tank 3, first flocculation tank 4, sodium carbonate reaction tank 9, the roof middle part of ferric chloride reaction tank 10 and second flocculation tank 11 is all rotated and is connected in the middle part of impeller subassembly 24, through the processing of heavy metal remove device 16 and decalcification decarbonization device 17 two-stage to flying dust wash liquid, make flying dust wash liquid effectively carry out preliminary treatment.

The other end of the first feeding pipe 27 is fixedly connected to one end of the feeding pipe 26, the other end of the feeding pipe 26 is fixedly connected to the middle part of the bottom end of the fly ash filtrate tank 1, a feeding pump 20 is arranged on one side of the feeding pipe 26 close to the fly ash filtrate tank 1, a first stirring blade 19 is arranged in the middle part of the fly ash filtrate tank 1, the upper end of the first stirring blade 19 penetrates through the middle part of the top wall of the fly ash filtrate tank 1, the upper end of the first stirring blade 19 is fixedly connected to the driving end of the first motor 18, the fly ash washing liquid passes through the fly ash filtrate tank 1 and is pumped into the heavy metal removing device 16 by the feeding pump 20 through the feeding pipe 26, the first stirring blade 19 is driven by the first motor 18 to rotate, so that impurities in the fly ash washing liquid in the fly ash filtrate tank 1 can be sufficiently moved and separated out, subsequent flocculation and sedimentation are facilitated, the treatment time is saved to a certain extent for subsequent treatment, and the washing liquid to be temporarily stored, the sodium sulfide reaction tank 2 is communicated with the ferrous sulfate reaction tank 3 through a first upper water outlet 25, the ferrous sulfate reaction tank 3 is communicated with a first flocculation tank 4 through a first lower water outlet 28, the first flocculation tank 4 is communicated with a first clarifier 5 through a first water inlet pipe 29, the first clarifier 5 is communicated with a first clarification tank 6 through a first communication port 48, through the arrangement of the first upper water outlet 25, the first lower water outlet 28 and the first water inlet pipe 29, the fly ash washing liquid after adding the medicament can be fully mixed when the impeller assembly 24 is stirred, the fly ash washing liquid can flow and enter the next treatment process, the fly ash washing liquid in the first clarifier 5 and the first clarification tank 6 can be fully mixed due to the arrangement of the first communication port 48, one end of a second pipeline 31 penetrates through the middle part of the bottom end of the sedimentation tank 8, the other end of the second pipeline 31 is fixedly connected with a sludge dewatering machine 15, the second pipeline 31 is provided with a first sludge discharge pump 33, the bottom middle part of the second clarification tank 13 penetrates through one end of a fourth pipeline 42, the other end of the fourth pipeline 42 is fixedly connected to the sludge dewatering machine 15, the fourth pipeline 42 is provided with a second sludge discharge pump 44, sludge deposited at the bottom in the sedimentation tank 8 and the first clarification tank 6 is pumped and discharged through the first sludge discharge pump 33 to ensure that the sludge can work normally, sludge in the second clarification tank 13 can be pumped through the second sludge discharge pump 44 to ensure that the sludge can work normally, sludge discharged by the first sludge discharge pump 33 and the second sludge discharge pump 44 is dewatered and dried by the sludge dewatering machine 15, one side of the bottom middle part of the first clarification tank 6 is penetrated with a first sludge return pipe 30, the other end of the first sludge return pipe 30 penetrates through one side of the bottom wall of the first clarifier 5, one side of the first sludge return pipe 30 is provided with a first sludge pump 32, the upper end of a third pipeline 34 penetrates through the middle part of the bottom end of the first clarification tank 6, the lower end of the third pipeline 34 is communicated with a second pipeline 31, a first sludge pump 32 can extract partial sludge in the first clarification tank 6 into the first clarifier 5 through a first sludge return pipe 30, heavy metal ions in water washing liquid can be sufficiently flocculated, heavy metal ions in fly ash water washing liquid can be sufficiently removed, a sodium carbonate reaction tank 9 is communicated with an iron chloride reaction tank 10 through a second upper water outlet 38, the iron chloride reaction tank 10 is communicated with a second flocculation tank 11 through a second lower water outlet 39, the second flocculation tank 11 is communicated with the second clarifier 12 through a second water inlet pipe 40, the second clarifier 12 is communicated with a second clarification tank 13 through a second communication port 49, and the fly ash water washing liquid is added with Na2CO3, a second lower water outlet 39 and the second water inlet pipe 40 through the arrangement of the second upper water outlet 38, the second lower water outlet 39 and the second water inlet pipe 40, FeCl3 and PAM can be fully mixed and flow, the washing liquid can flow smoothly for next treatment, the flocculated washing liquid in the second clarifier 12 and the second clarifier 13 can be fully mixed by arranging the second communicating port 49, the inner flocculation of the second clarifier 13 can flow well and fully precipitate, a second sludge return pipe 41 penetrates through one side of the middle part of the bottom end of the second clarifier 13, the other end of the second sludge return pipe 41 penetrates through one side of the bottom wall of the second clarifier 12, a second sludge pump 43 is arranged on one side of the second sludge return pipe 41 close to the second clarifier 13, the second sludge pump 43 can pump partial sludge in the second clarifier 13 into the second clarifier 12 through the second sludge return pipe 41, so that carbon element compounds and calcium ion mixtures thereof in the fly ash washing liquid can be fully flocculated, and the fly ash washing liquid can be well treated for next step, impeller component 24's top all is provided with second motor 35, and the equal fixed connection of drive end of second motor 35 is in the upper end of puddler 36, and the equal fixedly connected with second stirring leaf 37 in the lower part both sides of puddler 36, second motor 35 drive puddler 36 and rotate, make second stirring leaf 37 correspond and stir the washing liquid after heavy metal remove device 16 and the inside medicament that adds of decalcification decarbonization device 17, make its ability intensive mixing.

The working principle is as follows: fly ash washing liquid passes through a fly ash filtrate tank and is pumped into a heavy metal removal device through a material conveying pipe by a material conveying pump, the fly ash washing liquid firstly enters a sodium sulfide reaction tank through a first material conveying pipe in the heavy metal removal device, then sequentially passes through a ferrous sulfate reaction tank, a first flocculation tank, a first clarifier and a first clarification tank, when the fly ash washing liquid sequentially passes through the sodium sulfide reaction tank, the ferrous sulfate reaction tank and the first flocculation tank, Na2S, FeSO4 and PAM are sequentially added into the fly ash washing liquid, then the fly ash washing liquid with a medicament in the sodium sulfide reaction tank, the ferrous sulfate reaction tank and the first flocculation tank is stirred through an impeller assembly, so that the medicament and the washing liquid can be rapidly mixed, the fly ash mixed washing liquid can be fully flocculated by the first clarifier and the first clarification tank, and simultaneously a part of sludge in the first clarification tank can be extracted into the first clarifier through a first sludge return pipe, heavy metal ions in water washing liquid can be fully flocculated, the heavy metal ions in fly ash water washing liquid can be fully removed, then the water washing liquid enters a decalcification and decarbonization device through a first pipeline after impurities are removed through a carbon dioxide aeration tank and a sedimentation tank, the fly ash water washing liquid firstly enters a sodium carbonate reaction tank through a second feeding pipe in the decalcification and decarbonization device, then sequentially passes through an iron chloride reaction tank, a second flocculation tank, a second clarifier and a second clarification tank, when the fly ash water washing liquid sequentially passes through the sodium carbonate reaction tank, the iron chloride reaction tank and the second flocculation tank, Na2CO3, FeCl3 and PAM are sequentially added into the fly ash water washing liquid, then the fly ash water washing liquid with medicament in the sodium carbonate reaction tank, the iron chloride reaction tank and the second flocculation tank is stirred through an impeller assembly, so that the medicament and the water washing liquid can be rapidly mixed, and the fly ash mixed water washing liquid can be fully clarified through the second clarifier and the second flocculation tank, meanwhile, the second sludge pump can extract partial sludge in the second clarification tank into the second clarifier through the second sludge return pipe, so that carbon and calcium ion mixtures in the fly ash washing liquid can be fully flocculated, the fly ash washing liquid can be well treated on the next step, and the fly ash washing liquid can be effectively pretreated through two stages of heavy metal removal devices and decalcification and decarbonization devices, so that the fly ash washing liquid is worthy of being widely popularized.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a domestic waste incineration fly ash washing liquid pretreatment systems, includes heavy metal remove device (16) and decalcification decarbonization device (17), its characterized in that: one side of heavy metal removing device (16) is provided with sodium sulfide reaction tank (2), the bottom middle part of sodium sulfide reaction tank (2) runs through the one end at first inlet pipe (27), the middle part fixed connection of first inlet pipe (27) is on the upper portion of sodium sulfide reaction tank (2) one side outer wall, the opposite side fixed connection of sodium sulfide reaction tank (2) is in one side of ferrous sulfate reaction tank (3), the opposite side fixed connection of ferrous sulfate reaction tank (3) is in one side of first flocculation tank (4), the opposite side fixed connection of first flocculation tank (4) is in one side of first clarifier (5), the opposite side fixed connection of first clarifier (5) is in one side of first clarifier (6), the upper portion of first clarifier (6) opposite side lateral wall is provided with first gap (22), first gap (22) through-connection is in a carbon dioxide aeration tank (7) through first pipeline (21) The other side of the carbon dioxide aeration tank (7) is connected to one side of a sedimentation tank (8) through a first pipeline (21), the other side of the sedimentation tank (8) is fixedly connected to one side of a decalcification and decarbonization device (17) through the first pipeline (21), a sodium carbonate reaction tank (9) is arranged on one side of the decalcification and decarbonization device (17), the middle part of the bottom end of the sodium carbonate reaction tank (9) penetrates through one end of a second feeding pipe (47), the other end of the second feeding pipe (47) is fixedly connected with the first pipeline (21), the middle part of the second feeding pipe (47) is fixedly connected to the upper part of the outer wall of one side of the sodium carbonate reaction tank (9), the other side of the sodium carbonate reaction tank (9) is fixedly connected to one side of an iron chloride reaction tank (10), and the other side of the iron chloride reaction tank (10) is fixedly connected to one side of a second flocculation tank (11), the other side of the second flocculation trough (11) is fixedly connected with one side of a second clarifier (12), the other side of the second clarifier (12) is fixedly connected with one side of a second clarifier (13), a second overflow port (45) is arranged at the upper part of the other side of the second clarification tank (13), the second overflow port (45) is fixedly connected with one end of a water outlet pipe (46), the other end of the water outlet pipe (46) is fixedly connected with an intermediate water tank (14), the middle part of one end of the first feeding pipe (27) far away from the sodium sulfide reaction tank (2) and the middle part of one end of the second feeding pipe (47) far away from the sodium carbonate reaction tank (9) are both provided with an adjustable weir plate (23), the middle parts of the top walls of the sodium sulfide reaction tank (2), the ferrous sulfate reaction tank (3), the first flocculation tank (4), the sodium carbonate reaction tank (9), the ferric chloride reaction tank (10) and the second flocculation tank (11) are all rotatably connected to the middle part of the impeller assembly (24).

2. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: the other end fixed connection of first inlet pipe (27) is in the one end of conveying pipeline (26), the other end fixed connection of conveying pipeline (26) is in the bottom middle part of fly ash filtrate groove (1), one side that conveying pipeline (26) are close to fly ash filtrate groove (1) is provided with conveying pump (20), the interior middle part of fly ash filtrate groove (1) is provided with first stirring leaf (19), the upper end fixed connection of the upper end of first stirring leaf (19) through the roof middle part of fly ash filtrate groove (1) and first stirring leaf (19) is at the drive end of first motor (18).

3. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: the sodium sulfide reaction tank (2) is communicated with the ferrous sulfate reaction tank (3) through a first upper water outlet (25), the ferrous sulfate reaction tank (3) is communicated with the first flocculation tank (4) through a first lower water outlet (28), the first flocculation tank (4) is communicated with the first clarifier (5) through a first water inlet pipe (29), and the first clarifier (5) is communicated with the first clarification tank (6) through a first communication port (48).

4. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: the one end that has second pipeline (31) is run through at the bottom middle part of sedimentation tank (8), the other end fixedly connected with sludge dewaterer (15) of second pipeline (31), be provided with first mud pump (33) on second pipeline (31), the one end at fourth pipeline (42) is run through at the bottom middle part of second depositing reservoir (13), the other end fixed connection of fourth pipeline (42) is on sludge dewaterer (15), be provided with second mud pump (44) on fourth pipeline (42).

5. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: first sludge return pipe (30) has been run through to one side at first clarifier (6) bottom middle part, the other end of first sludge return pipe (30) runs through on one side of the diapire of first clarifier (5), one side of first sludge return pipe (30) is provided with first sludge pump (32), the upper end that has third pipeline (34) has been run through to the bottom middle part of first clarifier (6), the lower extreme and the second pipeline (31) intercommunication of third pipeline (34).

6. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: the sodium carbonate reaction tank (9) is communicated with the ferric chloride reaction tank (10) through a second upper water outlet (38), the ferric chloride reaction tank (10) is communicated with the second flocculation tank (11) through a second lower water outlet (39), the second flocculation tank (11) is communicated with the second clarifier (12) through a second water inlet pipe (40), and the second clarifier (12) is communicated with the second clarification tank (13) through a second communication port (49).

7. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: a second sludge return pipe (41) penetrates through one side of the middle part of the bottom end of the second clarification tank (13), the other end of the second sludge return pipe (41) penetrates through one side of the bottom wall of the second clarifier (12), and a second sludge pump (43) is arranged on one side, close to the second clarification tank (13), of the second sludge return pipe (41).

8. The pretreatment system of the household garbage incineration fly ash water washing liquid according to claim 1, characterized in that: the top of impeller subassembly (24) all is provided with second motor (35), the equal fixed connection of drive end in puddler (36) of second motor (35) is in the upper end of puddler (36), the equal fixedly connected with second stirring leaf (37) in lower part both sides of puddler (36).