CN112094004A - Novel sludge pyrohydrolysis treatment system and method capable of recycling carbon source - Google Patents

Novel sludge pyrohydrolysis treatment system and method capable of recycling carbon source Download PDF

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Publication number
CN112094004A
CN112094004A CN202010928598.6A CN202010928598A CN112094004A CN 112094004 A CN112094004 A CN 112094004A CN 202010928598 A CN202010928598 A CN 202010928598A CN 112094004 A CN112094004 A CN 112094004A
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struvite
reactor
sludge
carbon source
plate
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王学科
张春苗
焦海亮
穆童
王纯
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Tianjin Enew Environmental Protection Engineering Co ltd
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Tianjin Enew Environmental Protection Engineering Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/45—Phosphates containing plural metal, or metal and ammonium
    • C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1838—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines the hot gas being under a high pressure, e.g. in chemical installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Fertilizers (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention provides a novel sludge pyrohydrolysis treatment system and method capable of recycling a carbon source, and the system comprises a tempering tank, a contact reactor connected with the tempering tank, a plate-frame dehydrator connected with an outlet of the contact reactor, a struvite reactor connected with a liquid-phase outlet of the plate-frame dehydrator, and a struvite separation device connected with an outlet of the struvite reactor, wherein a solid-phase treatment device is arranged between a solid-phase outlet of the plate-frame dehydrator and the struvite reactor, and a heat recovery device is arranged between the solid-phase treatment device and the contact reactor. According to the invention, through the action of thermal hydrolysis, the dissolution rate of COD is increased, the content of ammonia nitrogen and phosphorus in the waste liquid is reduced through a struvite precipitation method of adding magnesium salt and not adding phosphate, a carbon source is provided for a sewage plant, the heat generated by sludge self-incineration is continuously recycled in the thermal hydrolysis process, the consumption of heat and energy is reduced, a struvite fertilizer is obtained, the carbon source is recycled, and the sludge is recycled.

Description

Novel sludge pyrohydrolysis treatment system and method capable of recycling carbon source
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a novel sludge pyrohydrolysis treatment system and method capable of recycling a carbon source.
Background
As the COD content of inlet water of most sewage treatment plants in China is low and the carbon source of the original inlet water is insufficient, the nitrogen and phosphorus removal effect is not ideal and the problem that N, P discharge does not reach the standard is increasingly serious. Most of the existing sewage plants adopt a mode of adding carbon source medicaments to solve the problem, but the carbon source purchase can cause the increase of the operation cost and is also contrary to the aims of low energy consumption and low chemical addition.
Sewage plants produce a large amount of sludge every day, and the sludge contains a large amount of COD and also contains a large amount of silt, ammonia nitrogen, phosphorus and the like. Conventional treatment modes of sludge plants include landfill and composting technologies, and secondary pollution of land and water resources can be caused by landfill; and the compost needs to be added with auxiliary materials, odor is generated in the composting process, and the quality of the fertilizer is low.
Disclosure of Invention
The invention aims to solve the problems and designs a novel sludge pyrohydrolysis treatment system and a novel sludge pyrohydrolysis treatment method capable of recycling a carbon source.
The technical scheme of the invention is that the novel sludge pyrohydrolysis treatment system capable of recycling the carbon source comprises a conditioning tank, a contact reactor connected with the conditioning tank, a plate-frame dehydrator connected with an outlet of the contact reactor, a struvite reactor connected with a liquid-phase outlet of the plate-frame dehydrator, and a struvite separation device connected with an outlet of the struvite reactor, wherein a solid-phase treatment device is arranged between a solid-phase outlet of the plate-frame dehydrator and the struvite reactor, and a heat recovery device is arranged between the solid-phase treatment device and the contact reactor.
The solid phase treatment device comprises a mud cake incinerator connected with the plate-and-frame dehydrator, an acid leaching reaction tank connected to the outlet of the mud cake incinerator, and a centrifuge connected between the acid leaching reaction tank and the struvite reactor.
The heat recovery device comprises a waste heat steam boiler, and the waste heat steam boiler is connected between the mud cake incinerator and the contact reactor.
And a first dosing device is connected to the acid leaching reaction tank, and a second dosing device and a third dosing device are connected to the struvite reactor.
An acid solution is arranged in the first medicine adding device, and the acid solution is one of sulfuric acid or hydrochloric acid.
A magnesium-containing compound is arranged in the second dosing device, an alkaline medicament is arranged in the third dosing device, and the alkaline medicament is one of NaOH or CaO.
And stirring devices are arranged in the tempering tank, the acid leaching reaction tank and the struvite reactor.
A novel sludge pyrohydrolysis treatment method capable of recovering carbon sources is characterized by comprising the following steps:
a. adding water into the sludge in the conditioning tank, and starting a stirring device in the conditioning tank to stir and regulate until the water content of the sludge is 90-95%;
b. the contact reactor receives the adjusted sludge and carries out thermal hydrolysis reaction for 20-60min at the temperature of 140-180 ℃;
c. the sludge after thermal hydrolysis enters a plate-and-frame dehydrator for mechanical dehydration, the sludge enters a mud cake incinerator from a solid-phase outlet of the plate-and-frame dehydrator after being subjected to plate-and-frame filter pressing, and the dehydrated filtrate enters a struvite reactor from a liquid-phase outlet of the plate-and-frame dehydrator;
d. in the mud cake incinerator, the mud cake is incinerated at the temperature of 850-950 ℃, hot flue gas generated by incineration enters a waste heat steam boiler, the waste heat steam boiler heats a contact reactor, and the generated flue gas is discharged into the atmosphere after being treated;
e. directly feeding the sludge cake generated by incineration in the sludge cake incinerator into an acid leaching reaction tank, simultaneously adding one of sulfuric acid or hydrochloric acid solution into the acid leaching reaction tank by a first medicine adding device, starting a stirring device in the acid leaching reaction tank for reaction, and separating out a phosphorus-containing supernatant through a centrifugal machine after reacting for 2 hours;
f. adding the phosphorus-containing supernatant separated by the centrifuge into a struvite reactor, then adding NaOH solution or CaO into the struvite reactor by a third medicine adding device to adjust the PH to 8.5-9.5, then adding a magnesium-containing compound into the struvite reactor by a second medicine adding device, and starting a stirring device in the struvite reactor to stir for reaction;
g. after the solution in the struvite reactor is reacted, the solution is conveyed into a struvite separator for separation and filtration to obtain the sediment of the struvite fertilizer and the supernatant containing COD, and the supernatant containing COD is refluxed to a sewage plant to provide a carbon source.
In the step e, the acidic solution added by the first medicine adding device is added until the solid-to-liquid ratio is at least 150 ml/g.
In the step f, the reaction is stirred for at least 30 min.
The invention has the advantages and positive effects that:
1. according to the invention, through the action of thermal hydrolysis, the floc structure of the sludge is destroyed, the solid content of the sludge is increased, the dissolution rate of COD is increased, the content of ammonia nitrogen and phosphorus in the waste liquid is reduced through a struvite precipitation method of adding magnesium salt and not adding phosphate, a carbon source is provided for a sewage plant, and the cost is greatly reduced;
2. the invention can be reused in the thermal hydrolysis process through the heat generated by the self-incineration of the treated sludge, thereby reducing the heat loss and energy consumption and saving the cost.
3. In the invention, the carbon source is recycled, the struvite fertilizer is also obtained, and the sludge is recycled.
Drawings
FIG. 1 is a schematic view of a system according to embodiment 1;
FIG. 2 is a schematic system diagram of example 2;
fig. 3 is a schematic view of a waste heat steam boiler.
In the figure: 1. a tempering tank; 2. a contact reactor; 3. a plate frame dehydrator; 4. a mud cake incinerator; 5. a waste heat steam boiler; 6. an acid leaching reaction tank; 7. a first dosing device; 8. a centrifuge; 9. a struvite reactor; 10. a second dosing device; 11. a third dosing device; 12. a struvite separation device; 13. a stirring device; 14. a waste heat recovery pipe; 15. a heat pipe; 16. a flue gas inlet; 17. a coal economizer; 18. a flue gas outlet; 19. an ash hopper; 20. a gas storage tank; 21. an air compression cabinet; 22. an acetylene supply cabinet; 23. a hybrid ignition cabinet; 24. a shock wave generating tank; 25. a nozzle; 26; sludge; 27. purifying the flue gas; 28. a struvite fertilizer; 29. a carbon source.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
example 1: as shown in figure 1, the novel sludge pyrohydrolysis treatment system capable of recycling carbon sources comprises a tempering tank 1, a contact reactor 2 connected with the tempering tank 1, a plate-frame dehydrator 3 connected with the outlet of the contact reactor 2, a struvite reactor 9 connected with the liquid-phase outlet of the plate-frame dehydrator 3, and a struvite separation device 12 connected with the outlet of the struvite reactor 9, wherein a solid-phase treatment device is further arranged between the solid-phase outlet of the plate-frame dehydrator 3 and the struvite reactor 9, the solid-phase treatment device comprises a cake incinerator 4 connected with the plate-frame dehydrator 3, an acid leaching reaction tank 6 connected with the outlet of the cake incinerator 4, and a centrifuge 8 connected between the acid leaching reaction tank 6 and the struvite reactor 9, a first chemical adding device 7 is connected to the acid leaching reaction tank 6, and a second chemical adding device 10 and a third chemical adding device 11 are connected to the struvite reactor 9, an acidic solution is arranged in the first medicine adding device 7, the acidic solution is one of sulfuric acid or hydrochloric acid, a magnesium-containing compound is arranged in the second medicine adding device 10, an alkaline agent is arranged in the third medicine adding device 11, the alkaline agent is one of NaOH or CaO, and stirring devices 13 are arranged in the tempering tank 1, the acid leaching reaction tank 6 and the struvite reactor 9.
The processing flow based on the system is as follows:
the method comprises the following steps: adding water into the incoming sample sludge 26 in the conditioning tank 1, starting a stirring device 13 in the conditioning tank 1 to stir and adjust until the water content of the sludge 26 is 95%;
step two: the regulated sludge 26 is sent into the contact reactor 2, a thermal hydrolysis reaction is carried out for 20min at the temperature of 140 ℃, and during the thermal hydrolysis, the microbial cell walls in the sludge 26 are broken, so that the floc structure of the sludge 26 is damaged, and the solubility of the sludge 26 is increased;
step three: the sludge 26 after thermal hydrolysis enters a plate-and-frame dehydrator 3 for mechanical dehydration, in the process, the water content of the sludge 26 is reduced to 40%, the COD content in the dehydrated filtrate is 20000mg/L, and the ammonia nitrogen content is 2000mg/L, then the filtrate is directly fed into a struvite reactor 9 through a liquid phase outlet of the plate-and-frame dehydrator 3, and mud cakes enter a mud cake incinerator 4 through a solid phase outlet;
step four: the mud cake after dehydration of the plate frame dehydrator 3 is incinerated at 850 ℃ in the mud cake incinerator 4 to obtain incinerated slag and the incinerated slag is sent into the acid leaching reaction tank 6;
step five: after the slag generated by incineration enters an acid leaching reaction tank 6, adding a sulfuric acid or hydrochloric acid solution into the slag through a first medicine adding device 7, wherein the solid-to-liquid ratio is at least 150ml/g, simultaneously starting a stirring device 13 in the acid leaching reaction tank 6 for reaction, wherein the stirring speed is 120r/min, the reaction time is 2 hours, phosphorus in the slag can be leached, the leaching rate is 80%, the content of phosphorus in the leached supernatant is 600mg/L, then separating the slag from the leached supernatant through a centrifugal machine 8, and then conveying the supernatant into a struvite reactor 9;
step six: the filtrate after dehydration by the plate and frame dehydrator 3 and the supernatant leached by the acid leaching reaction tank 6 are stirred and reacted in a struvite reactor 9, firstly, NaOH solution is added through a third medicine adding device 11 to adjust the PH value in the struvite reactor 9 to 8.5, and then, a magnesium-containing compound such as MgSO (MgSO) is added into the struvite reactor 9 through a second medicine adding device 104、MgO、Mg(OH)2、MgCl2And stirring for struvite crystallization and precipitation reaction: mg (magnesium)2++NH4 ++PO4 3-+H2O＝MgNH4PO46H2O, stirring for 30min by the stirring device 13;
step seven: after the solution in the struvite reactor 9 is reacted, the solution is conveyed to a struvite separation device 12, the precipitate is separated from the supernatant, the obtained precipitate is a crude struvite product which can be used for preparing a struvite fertilizer 28, and the separated supernatant flows back to a sewage plant to recycle a carbon source 29 therein.
Example 2: as shown in fig. 2, a novel sludge pyrohydrolysis treatment system capable of recycling carbon sources comprises a conditioning tank 1, a contact reactor 2 connected with the conditioning tank 1, a plate-frame dehydrator 3 connected with the outlet of the contact reactor 2, a struvite reactor 9 connected with the liquid outlet of the plate-frame dehydrator 3, and a struvite separation device 12 connected with the outlet of the struvite reactor 9, wherein a solid-phase treatment device is further arranged between the solid-phase outlet of the plate-frame dehydrator 3 and the struvite reactor 9, a heat recovery device is further arranged between the solid-phase treatment device and the contact reactor 2, the solid-phase treatment device comprises a cake incinerator 4 connected with the plate-frame dehydrator 3, an acid leaching reaction tank 6 connected with the outlet of the cake incinerator 4, and a centrifuge 8 connected between the acid leaching reaction tank 6 and the struvite reactor 9, the heat recovery device comprises a waste heat steam boiler 5, the waste heat steam boiler 5 is connected between the mud cake incinerator 4 and the contact reactor 2, the acid leaching reaction tank 6 is connected with a first dosing device 7, the struvite reactor 9 is connected with a second dosing device 10 and a third dosing device 11, an acid solution is arranged in the first dosing device 7, the acid solution is sulfuric acid or hydrochloric acid, a magnesium-containing compound is arranged in the second dosing device 10, an alkaline agent is arranged in the third dosing device 11, the alkaline agent is NaOH or CaO, and stirring devices are arranged in the tempering tank 1, the acid leaching reaction tank 6 and the struvite reactor 9.
The processing flow based on the system is as follows:
the method comprises the following steps: adding water into the incoming sample sludge 26 in the conditioning tank 1, starting a stirring device 13 in the conditioning tank 1 to stir and adjust until the water content of the sludge 26 is 90%;
step two: the regulated sludge 26 is sent into the contact reactor 2, a thermal hydrolysis reaction is carried out for 60min at the temperature of 180 ℃, and during the thermal hydrolysis, the microbial cell walls in the sludge 26 are broken, so that the floc structure of the sludge 26 is damaged, and the solubility of the sludge 26 is increased;
step three: the sludge 28 after the thermal hydrolysis enters a plate-and-frame dehydrator 3 for mechanical dehydration, in the process, the water content of the sludge 26 is reduced to 30%, the COD content in the dehydrated filtrate is 30000mg/L, and the ammonia nitrogen content is 3000mg/L, then the filtrate is directly fed into a struvite reactor 9 through a liquid phase outlet of the plate-and-frame dehydrator 3, and mud cakes enter a mud cake incinerator 4 through a solid phase outlet;
step four: the sludge cake after dehydration of the plate frame dehydrator 3 is incinerated at 950 ℃ in the sludge cake incinerator 4, hot flue gas generated by incineration enters the waste heat steam boiler 5, meanwhile, the waste heat steam boiler 5 heats the contact reactor 2, heat generated by incineration of the sludge 26 per se is continuously recycled to the thermal hydrolysis process, heat loss and energy consumption are reduced, cost is saved, and meanwhile, slag generated by incineration of the sludge cake incinerator 4 is sent to the acid leaching reaction tank 6;
step five: after the slag enters the acid leaching reaction tank 6, adding a sulfuric acid or hydrochloric acid solution into the slag through a first medicine adding device 7, wherein the solid-liquid ratio is at least 150ml/g, simultaneously starting a stirring device 13 in the acid leaching reaction tank 6 for reaction, the stirring speed is 120r/min, the reaction time is 2 hours, the phosphorus in the slag can be leached, the leaching rate is 85%, the phosphorus content in the leached supernatant is 800mg/L, then separating the slag from the leached supernatant through a centrifuge 8, and then conveying the supernatant into a struvite reactor 9;
step six: filtrate obtained after dehydration by the plate-and-frame dehydrator 3 and supernatant obtained after leaching by the acid leaching reaction tank 6 are stirred and reacted in a struvite reactor 9, CaO is added through a third medicine adding device 11 to adjust the PH value in the struvite reactor 9 to 8.5, and then a magnesium-containing compound such as MgSO (magnesium sulfate) is added into the struvite reactor 9 through a second medicine adding device 104、MgO、Mg(OH)2、MgCl2And stirring for struvite crystallization and precipitation reaction: mg (magnesium)2++NH4 ++PO4 3-+H2O＝MgNH4PO46H2O, stirring for 30min by the stirring device 13;
step seven: after the solution in the struvite reactor 11 is reacted, the solution is conveyed to a struvite separation device 12, the precipitate is separated from the supernatant, the obtained precipitate is a crude struvite product which can be used for preparing a struvite fertilizer 28, and the separated supernatant flows back to a sewage plant to recycle a carbon source 29 therein.
As shown in fig. 3, the waste heat steam boiler 5 includes a waste heat recovery pipe 14, a heat pipe 15 installed in the waste heat recovery pipe 14, a flue gas inlet 16 connected to one end of the waste heat recovery pipe 14, an economizer 17 connected to the other end of the waste heat recovery pipe 14, a flue gas outlet 18 connected to the economizer 17, a dust hopper 19 installed at the bottom of the waste heat recovery pipe 14, and a gas shock wave soot blower installed on the waste heat recovery pipe 14, where the gas shock wave soot blower includes a gas storage tank 20, an air compression cabinet 21, an acetylene supply cabinet 22, a hybrid ignition cabinet 23, a shock wave generation tank 24, and a spray pipe 25, the inlet of the air compression cabinet 21 is connected to the outlet of the gas storage tank 20, the outlet of the air compression cabinet 21 is connected to the inlet of the hybrid ignition cabinet 23, the outlet of the acetylene supply cabinet 22 is connected to the inlet of the hybrid ignition cabinet 23, the outlet of the hybrid ignition cabinet 23 is connected to the inlet of the shock wave, the outlet of the shock wave generating tank 24 is connected with a spray pipe 25, and the spray pipe 25 is arranged on the pipe wall of the waste heat recovery pipe 14 in a penetrating mode.
In this embodiment, still install gas shock wave soot blower additional on steam waste heat boiler, steam waste heat boiler's theory of operation does: let in hot flue gas from flue gas inlet 16, hot flue gas is during through waste heat recovery pipe 14, carry out the heat transfer with heat pipe 15 wherein, preserve the heat, in flue gas entering economizer 17 afterwards, remaining heat is absorbed by economizer 17 in the flue gas, discharge from gas outlet 18 finally, and a large amount of dusts that carry in this in-process flue gas are gathered easily on heat pipe 15 and waste heat recovery pipe 14, if the unscheduled clearance, heat exchange efficiency can receive the influence, consequently install gas shock wave soot blower additional and be used for clearing up these deposition, then gas shock wave soot blower's workflow does:
the air storage tank 20 conveys air into the air compression cabinet 21 for compression, then the compressed air enters the mixed ignition cabinet 23, the acetylene supply cabinet 22 also conveys acetylene into the mixed ignition cabinet 23, the mixed gas is ignited by the mixed ignition cabinet 23, the gas enters the shock wave generation tank 24 after combustion and expansion, high-temperature fuel gas shock waves are formed and sprayed out from the spray pipe 25, deposited dust on the waste heat recovery pipe 14 and the heat pipe 15 is subjected to high-temperature purging, the deposited dust falls off and flies, meanwhile, the heating surface is vibrated, the dust layer attached to the heating surface is broken and falls off and finally falls into the dust hopper 19, and the problem that the deposited dust affects the heat exchange efficiency of the waste heat steam boiler 5 is avoided.
1. In summary, the overall usage flow and effect of the system are as follows: adding water into the sludge in a conditioning tank to adjust the water content to 90-95%, and then performing thermal hydrolysis in a contact reactor at the temperature of 140-180 ℃ for 20-60min to destroy the floc structure of the sludge, increase the solid content of the sludge and increase the dissolution rate of COD;
2. the sludge after thermal hydrolysis is mechanically dehydrated, the water content of the sludge is reduced to 30-40%, the sludge is convenient to burn in a sludge cake incinerator subsequently, the sludge in the sludge cake incinerator is burned at 850-950 ℃, hot flue gas generated by burning is sent into a waste heat steam boiler, a contact reactor is heated, heat energy is provided for thermal hydrolysis, the heat loss and the energy consumption are reduced, the cost is saved, and the thermal hydrolysis effect can be improved;
3. sending the slag generated by incineration into an acid leaching reaction tank, adding a sulfuric acid or hydrochloric acid solution until the solid-to-liquid ratio is at least 150ml/g, stirring at the rotating speed of 120r/min for 2 hours for reaction, and then leaching out phosphorus in the slag, wherein the leaching rate is as high as 80-85%, and the phosphorus content in the leaching solution is 800mg/L of 600-;
4. separating solid and liquid in the acid leaching reaction tank by using a centrifuge, sending the supernatant into a struvite reactor to react with the filtrate separated from the plate-and-frame dehydrator, wherein the COD content in the filtrate generated in the dehydration process of the plate-and-frame dehydrator is 25000-30000mg/L, the ammonia nitrogen content is 2500-3000mg/L, firstly adding NaOH solution or CaO in the struvite reactor to adjust the PH to 8.5-9.5, and then adding a magnesium-containing compound such as MgSO4、MgO、Mg(OH)2、MgCl2And the reaction is stirred for at least 30min, the product after the reaction is sent to a struvite separator for solid-liquid separation, the obtained precipitate is a struvite crude product which can be used for preparing a struvite fertilizer, the obtained supernatant flows back to a sewage plant, and a carbon source in the supernatant is recovered.
The two embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (10)

1. The utility model provides a novel mud pyrohydrolysis processing system of recoverable carbon source, includes quenching and tempering pond (1), contact reactor (2) that meet with quenching and tempering pond (1), sheet frame hydroextractor (3) that meet with contact reactor (2) export, struvite reactor (9) that meet with sheet frame hydroextractor (3) liquid phase export and struvite separator (12) that meet with struvite reactor (9) export, its characterized in that: a solid phase treatment device is also arranged between the solid phase outlet of the plate frame dehydrator (3) and the struvite reactor (9), and a heat recovery device is also arranged between the solid phase treatment device and the contact reactor (2).
2. The novel sludge pyrohydrolysis treatment system capable of recycling the carbon source according to claim 1, wherein: the solid phase treatment device comprises a mud cake incinerator (4) connected with the plate-and-frame dehydrator (3), an acid leaching reaction tank (6) connected to the outlet of the mud cake incinerator (4), and a centrifuge (8) connected between the acid leaching reaction tank (6) and the struvite reactor (9).
3. The novel sludge pyrohydrolysis treatment system capable of recycling the carbon source according to claim 1, wherein: the heat recovery device comprises a waste heat steam boiler (5), and the waste heat steam boiler (5) is connected between the mud cake incinerator (4) and the contact reactor (2).
4. The novel sludge pyrohydrolysis treatment system capable of recycling the carbon source according to claim 1, wherein: a first medicine adding device (7) is connected to the acid leaching reaction tank (8), and a second medicine adding device (10) and a third medicine adding device (11) are connected to the struvite reactor (9).
5. The novel sludge pyrohydrolysis treatment system capable of recycling the carbon source according to claim 4, wherein: an acid solution is arranged in the first medicine adding device (7), and the acid solution is one of sulfuric acid or hydrochloric acid.
6. The novel sludge pyrohydrolysis treatment system capable of recycling the carbon source according to claim 4, wherein: a magnesium-containing compound is arranged in the second dosing device (10), an alkaline medicament is arranged in the third dosing device (11), and the alkaline medicament is one of NaOH or CaO.
7. The novel sludge pyrohydrolysis treatment system capable of recycling the carbon source according to claim 1, wherein: and stirring devices (13) are arranged in the tempering tank (1), the acid leaching reaction tank (6) and the struvite reactor (9).
8. A novel sludge pyrohydrolysis treatment method capable of recovering carbon sources is characterized by comprising the following steps:
a. adding water into the sludge in the conditioning tank (1), and starting a stirring device (13) in the conditioning tank (1) to stir and regulate until the water content of the sludge is 90-95%;
b. the contact reactor (2) receives the adjusted sludge and carries out thermal hydrolysis reaction for 20-60min at the temperature of 140-180 ℃;
c. the sludge after thermal hydrolysis enters a plate-and-frame dehydrator (3) for mechanical dehydration, the sludge enters a mud cake incinerator (4) from a solid-phase outlet of the plate-and-frame dehydrator (3) after being subjected to plate-and-frame filter pressing, and the dehydrated filtrate enters a struvite reactor (9) from a liquid-phase outlet of the plate-and-frame dehydrator (3);
d. in the mud cake incinerator (4), the mud cake is incinerated at the temperature of 850-950 ℃, hot flue gas generated by incineration enters a waste heat steam boiler (5), the waste heat steam boiler (5) heats the contact reactor (2), and the generated flue gas is discharged into the atmosphere after being treated;
e. directly feeding the sludge cake generated by incineration in the sludge cake incinerator (4) into an acid leaching reaction tank (6), simultaneously adding one of sulfuric acid or hydrochloric acid solution into the acid leaching reaction tank (6) by a first medicine adding device (7), starting a stirring device (13) in the acid leaching reaction tank (6) for reaction, and separating out a phosphorus-containing supernatant through a centrifugal machine (8) after the reaction is carried out for 2 hours;
f. adding the phosphorus-containing supernatant separated by the centrifuge (8) into a struvite reactor (9), then adding NaOH solution or CaO into the struvite reactor (9) by a third medicine adding device (11) to adjust the PH to 8.5-9.5, then adding a magnesium-containing compound into the struvite reactor (9) by a second medicine adding device (10), and starting a stirring device (13) in the struvite reactor (9) to stir for reaction;
g. after the solution in the struvite reactor (9) is reacted, the solution is conveyed into a struvite separator (12) for separation and filtration to obtain the sediment of the struvite fertilizer (28) and the supernatant containing COD, and the supernatant containing COD is returned to a sewage plant to provide a carbon source (29).
9. The novel sludge pyrohydrolysis treatment method capable of recovering carbon source according to claim 7, wherein: in the step e, the acidic solution added by the first medicine adding device (7) is added until the solid-to-liquid ratio is 150 ml/g.
10. The novel sludge pyrohydrolysis treatment method capable of recovering carbon source according to claim 7, wherein: in the step f, the reaction is stirred for at least 30 min.
CN202010928598.6A 2020-09-07 2020-09-07 Novel sludge pyrohydrolysis treatment system and method capable of recycling carbon source Pending CN112094004A (en)

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