CN113402050A

CN113402050A - Domestic waste incineration fly ash washing liquid pretreatment system

Info

Publication number: CN113402050A
Application number: CN202011615454.1A
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: 2021-09-17

Abstract

The invention provides a pretreatment system for a household garbage incineration fly ash washing liquid, and relates to the field of garbage incineration fly ash treatment. This domestic waste incineration fly ash washing liquid pretreatment systems, a domestic waste incineration fly ash 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 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 invention relates to the technical field of waste incineration fly ash treatment, in particular to a pretreatment system for household waste incineration fly ash water washing liquid.

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, the chemical composition of the fly ash is similar to that of building materials, the harmless and recycling 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, the mass percent of chlorine ions in ash slag is reduced to below 1 percent so as to meet the concentration requirement of relevant 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, the water washing liquid is water with complex components, high-salt and high-alkali wastewater, 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.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a pretreatment system for fly ash washing liquid generated by burning household garbage, which solves the problems that the fly ash washing liquid has huge water quality change due to huge fly ash component fluctuation, the pretreatment mode of dosing and precipitation has unsatisfactory effect, and the flocculation effect is poor during fly ash treatment.

(II) technical scheme

In order to achieve the purpose, the invention is realized by 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.

Preferably, 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 of first stirring leaf runs through the drive end of the upper end fixed connection at first motor in the middle part of the roof of flying ash filtrate groove and first stirring leaf.

Preferably, 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.

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

Preferably, a first sludge return pipe penetrates through one side of the middle part of the bottom end of the first clarification tank, the other end of the first sludge return pipe penetrates through one side of the bottom wall of the first clarifier, a first sludge pump is arranged on one side of the first sludge return pipe, the upper end of a third pipeline penetrates through the middle part of the bottom end of the first clarification tank, and the lower end of the third pipeline is communicated with the second pipeline.

Preferably, 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.

Preferably, 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.

Preferably, 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 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.

(III) advantageous effects

The invention provides a pretreatment system for a household garbage incineration fly ash water washing liquid. The method has the following beneficial effects:

1. according to the invention, through the arrangement of two stages of the heavy metal removing device and the decalcification and decarbonization device, the fly ash water washing liquid can be effectively treated twice, impurities in the fly ash water washing liquid can be efficiently removed, the first-stage heavy metal removing device is arranged from front to back through the sodium sulfide reaction tank, the ferrous sulfate reaction tank and the first flocculation tank, Na2S, FeSO4 and PAM are sequentially added into water to remove heavy metal ions in the water washing liquid, the second-stage decalcification and decarbonization device is arranged from front to back through the sodium carbonate reaction tank, the ferric chloride reaction tank and the second flocculation tank, Na2CO3, FeCl3 and PAM are sequentially added into the water to perform decalcification and decarbonization treatment on the water body, and meanwhile, the heavy metal removing device and the decalcification and decarbonization device are a water treatment structure integrating mechanical mixing, flocculation, clarification and efficient mixing, so that the water washing liquid with poor settleability is well treated.

2. The invention can fully mix the water washing liquid after adding the medicine by arranging the impeller component in the heavy metal removing device and the decalcification and decarbonization device, can promote the increase of alum floc when the water washing liquid enters the first clarifier, the first clarifying tank, the second clarifier and the second clarifying tank, simultaneously, the first sludge pump can pump partial sludge in the first clarifying tank into the first clarifier through the first sludge return pipe, the second sludge pump can pump partial sludge in the second clarifying 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, thereby effectively adsorbing pollutants such as colloid, suspended matters, emulsified oil, metal ions and the like, the sludge return can not only save the dosage of the medicine, but also can maintain the concentration of the suspended solids in the reaction zone at the optimal 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 the present invention;

FIG. 2 is a schematic structural view of a heavy metal removal apparatus according to the present invention;

FIG. 3 is a schematic structural view of a decalcification and decarbonization apparatus according to the present invention;

fig. 4 is a schematic structural view of an impeller assembly of the present invention.

Wherein, 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 clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

as shown in fig. 1-4, an embodiment of the present invention provides a pretreatment system for a fly ash washing liquid from incineration of household garbage, including a heavy metal removing device 16 and a decalcification and decarbonization device 17, wherein a sodium sulfide reaction tank 2 is disposed on one side of the heavy metal removing device 16, a middle portion of a bottom end of the sodium sulfide reaction tank 2 penetrates through one end of a first feeding pipe 27, a middle portion of the first feeding pipe 27 is fixedly connected to an upper portion of an outer wall of one side of the sodium sulfide reaction tank 2, another side of the sodium sulfide reaction tank 2 is fixedly connected to one side of a ferrous sulfate reaction tank 3, another side of the ferrous sulfate reaction tank 3 is fixedly connected to one side of a first flocculation tank 4, another side of the first flocculation tank 4 is fixedly connected to one side of a first clarifier 5, the fly ash washing liquid firstly enters the sodium sulfide reaction tank 2 through the first feeding pipe 27 in the heavy metal removing device 16, and then passes through the ferrous sulfate reaction tank 3, The first flocculating tank 4, the first clarifier 5 and the first clarifying tank 6, when the fly ash washing liquid flows through the sodium sulfide reaction tank 2, the ferrous sulfate reaction tank 3 and the first flocculating tank 4 in sequence, Na2S, FeSO4 and PAM are added into the fly ash washing liquid in sequence, then the sodium sulfide reaction tank 2, the ferrous sulfate reaction tank 3 and the fly ash washing liquid with the medicament in the first flocculating tank 4 are stirred through the impeller assembly 24, so that the medicament and the fly ash washing liquid can be rapidly mixed, the impeller washing assembly 24 can increase the mixing speed of mixed water after adding the medicament, the other side of the first clarifying tank 5 is fixedly connected to one side of the first clarifying tank 6, the first clarifying tank 5 and the first clarifying tank 6 can enable the fly ash mixed washing liquid to be fully flocculated, and meanwhile, the first sludge pump 32 can extract partial sludge in the first clarifying tank 6 into the first clarifying tank 5 through the first sludge return pipe 30, heavy metal ions in washing liquid can be fully flocculated, the heavy metal ions in fly ash washing liquid can be fully removed, the increase of alum floc can be promoted by the unagitated mixed water in the first clarification tank 6 and the first clarifier 5, the alum floc is compact and uniform, a high-density suspended sludge layer is formed under the action of PAM and backflow sludge to increase the particle collision chance, pollutants such as colloid, suspended matters, emulsified oil, COD (chemical oxygen demand) and metal ions are effectively adsorbed, sludge backflow can save the dosage of a medicament, the concentration of suspended solids in a reaction zone can be maintained at the optimal level, and therefore the purpose of optimizing flocculation reaction is achieved, a first overflow opening 22 is arranged on the upper portion of the side wall of the other side of the first clarification tank 6, the mixed water overflowing from the first overflow opening 22 and after the heavy metal ions are removed 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 sewage can be treated in the next step, the first overflow port 22 is connected with one side of the carbon dioxide aeration tank 7 through the first pipeline 21, the other side of the carbon dioxide aeration tank 7 is connected with one side of the sedimentation tank 8 through the first pipeline 21, the sedimentation tank 8 removes the flocculated and precipitated 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 the 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 at 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 with one end of the feeding pipe 26, the other end of the feeding pipe 26 is fixedly connected with the middle part of the bottom end of the fly ash filtrate tank 1, one side of the feeding pipe 26 close to the fly ash filtrate tank 1 is provided with a feeding pump 20, the middle part of the fly ash filtrate tank 1 is provided with a first stirring blade 19, 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 with 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, through the rotation of first motor 18 drive first stirring leaf 19, make in the fly ash washing liquid of fly ash filtrate tank 1 inside impurity can the abundant motion be appeared, subsequent flocculation of being convenient for subsides, and certain degree saves the processing time for subsequent processing, also can keep in pending washing liquid simultaneously.

Sodium sulfide reaction tank 2 is through

first delivery port

25 and 3 intercommunications of ferrous sulfate reaction tank, ferrous sulfate reaction tank 3 is through first delivery port 28 and first flocculation basin 4 intercommunication down, first flocculation basin 4 is through first inlet tube 29 and first clarifier 5 intercommunication, first clarifier 5 is through first intercommunication mouth 48 and first depositing reservoir 6 intercommunication, through first delivery port 25 on, first delivery port 28 and first inlet tube 29's setting down, make the flying dust washing liquid after adding the medicament can be in the stirring of impeller subassembly 24, can the intensive flow and mix, make flying dust washing liquid can circulate and get into next treatment process simultaneously, the flying dust washing liquid in first clarifier 5 and the first depositing reservoir 6 can the intensive mixing by setting up of first intercommunication mouth 48.

The bottom middle part of sedimentation tank 8 runs through the one end that has second pipeline 31, the other end fixedly connected with sludge dewaterer 15 of second pipeline 31, be provided with first sludge pump 33 on the second pipeline 31, the bottom middle part of second clarification tank 13 runs through the one end at fourth pipeline 42, the other end fixed connection of fourth pipeline 42 is on sludge dewaterer 15, be provided with second sludge pump 44 on the fourth pipeline 42, the mud extraction of bottom deposit is discharged in sedimentation tank 8 and the first clarification tank 6 through first sludge pump 33, guarantee that it can normally work, can extract the mud in the second clarification tank 13 through second sludge pump 44, guarantee that it can normally work, the mud of first sludge pump 33 and second sludge pump 44 discharge is by sludge dewaterer 15 dehydration drying.

First sludge return pipe 30 has been run through to one side at 6 bottom middle parts of first clarification tank, the other end of first sludge return pipe 30 runs through the diapire one side at first clarifier 5, one side of first sludge return pipe 30 is provided with first sludge pump 32, the bottom middle part of first clarification tank 6 runs through the upper end that has third pipeline 34, the lower extreme and the 31 intercommunication of second pipeline 34, first sludge pump 32 can extract the partial mud in first clarification tank 6 to first clarifier 5 in through first sludge return pipe 30, heavy metal ion can fully flocculate in the messenger washing liquid, guarantee that the heavy metal ion in the flying ash washing liquid can fully get rid of.

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 a second flocculation tank 11 through a second lower water outlet 39, the second flocculation tank 11 is communicated with a 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, the fly ash washing liquid is added with Na2CO3 through 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 after flowing, meanwhile, the washing liquid can smoothly flow to perform next treatment, the flocculation washing liquid in the second clarifier 12 and the second clarification tank 13 can be fully mixed through the second communication port 49, and meanwhile, the inner flocculation clarification liquid can well flow and fully precipitate.

Second sludge return pipe 41 has been run through to one side at second clarifier 13 bottom middle part, the other end of second sludge return pipe 41 runs through the one side of second clarifier 12 diapire, one side that second sludge return pipe 41 is close to second clarifier 13 is provided with second sludge pump 43, second sludge pump 43 can be through second sludge return pipe 41 with the partial mud extraction to the second clarifier 12 in the second clarifier 13, make the carbon element compound in the flying ash washings and calcium ion mixture can fully flocculate, make the flying ash washings can fine carry out the processing on 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.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

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).