CN116103070B - Recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge - Google Patents
Recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge Download PDFInfo
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- CN116103070B CN116103070B CN202211111005.2A CN202211111005A CN116103070B CN 116103070 B CN116103070 B CN 116103070B CN 202211111005 A CN202211111005 A CN 202211111005A CN 116103070 B CN116103070 B CN 116103070B
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- 239000010802 sludge Substances 0.000 title claims abstract description 194
- 239000000446 fuel Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000004064 recycling Methods 0.000 title claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000002485 combustion reaction Methods 0.000 claims abstract description 46
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 19
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 18
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000000292 calcium oxide Substances 0.000 claims abstract description 16
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 16
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 16
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000002028 Biomass Substances 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 8
- KTWOOEGAPBSYNW-UHFFFAOYSA-N ferrocene Chemical compound [Fe+2].C=1C=C[CH-]C=1.C=1C=C[CH-]C=1 KTWOOEGAPBSYNW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 8
- 239000004323 potassium nitrate Substances 0.000 claims abstract description 8
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims abstract description 8
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006004 Quartz sand Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003822 epoxy resin Substances 0.000 claims abstract description 7
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000748 compression moulding Methods 0.000 claims abstract description 3
- 238000005189 flocculation Methods 0.000 claims description 35
- 230000016615 flocculation Effects 0.000 claims description 35
- 238000006243 chemical reaction Methods 0.000 claims description 34
- 239000003607 modifier Substances 0.000 claims description 34
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 21
- 230000018044 dehydration Effects 0.000 claims description 17
- 238000006297 dehydration reaction Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000008394 flocculating agent Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 7
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 7
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 239000011541 reaction mixture Substances 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 abstract description 26
- 239000003344 environmental pollutant Substances 0.000 abstract description 18
- 231100000719 pollutant Toxicity 0.000 abstract description 18
- 239000007800 oxidant agent Substances 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 239000002803 fossil fuel Substances 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 41
- 239000000779 smoke Substances 0.000 description 17
- 208000005156 Dehydration Diseases 0.000 description 16
- 238000012360 testing method Methods 0.000 description 13
- 235000012255 calcium oxide Nutrition 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 12
- 239000000428 dust Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 229920001661 Chitosan Polymers 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229920001296 polysiloxane Polymers 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- -1 polysiloxane Polymers 0.000 description 4
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical group [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 239000012258 stirred mixture Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- PZNOBXVHZYGUEX-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine;hydrochloride Chemical compound Cl.C=CCNCC=C PZNOBXVHZYGUEX-UHFFFAOYSA-N 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 125000001453 quaternary ammonium group Chemical class 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
-
- 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
- C02F11/008—Sludge treatment by fixation or solidification
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention belongs to the technical field of solid waste recycling, and discloses a recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge. Uniformly stirring and mixing the dried organic sludge with the water content of 15-25%, the combustion improver, the catalyst, the desulfurizing agent and the heat value lifting agent, and then performing compression molding to obtain the high heat value fuel; the combustion improver comprises potassium nitrate, magnesium nitrate, sodium chlorate, ferrocene and potassium persulfate; the catalyst comprises calcium carbonate, alumina, manganese dioxide and quartz sand; the desulfurizing agent comprises calcium oxide, calcium hydroxide and epoxy resin; the heating value improver comprises waste oil and biomass fuel. The fuel prepared by the invention takes the organic sludge as a main body, does not contain fossil fuel, has less oxidant consumption, low cost and full combustion, and does not generate secondary pollutants such as dioxin. Solves the problems of high water content, low heat value, insufficient combustion as fuel and the like of the organic sludge.
Description
Technical Field
The invention belongs to the technical field of solid waste recycling, and particularly relates to a recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge.
Background
The organic sludge contains a large amount of organic components, and has wide sources and high water content. However, most of the organic sludge contains N, P and other nutrient elements and other refractory toxic and harmful substances such as pathogenic microorganisms, heavy metals, antibiotics, polychlorinated biphenyls and the like, so that the treatment is difficult. The water content of the organic sludge is high, and the water content of the organic sludge from certain sources is up to more than 99%, so that the space required by sludge stockpiling is huge, and the resource utilization way is further limited. And if the organic sludge is not treated effectively, various pollutants contained in the organic sludge can enter the surrounding environment along with rainwater to cause pollution. Therefore, there is a need for a treatment method for dewatering organic sludge which can be conveniently and effectively performed, and which can greatly reduce the water content and the required stacking space. Most of organic matters and toxic and harmful substances are remained in the dehydrated sludge after the sludge is dehydrated. The dewatered sludge contains a large amount of organic matters, various toxic and harmful substances and the like, and the conventional final treatment methods for the dewatered sludge include a solidification method, a landfill method, an incineration method and the like. The curing method is to add cementing materials such as cement, fly ash and the like and mix the sludge to prepare a building base material with certain strength, the method has simple process and good stability, but needs to consume a large amount of cementing materials such as cement, fly ash and the like, for example, patent CN102424511A discloses a curing treatment method for sludge in municipal sewage plants, wherein the added lime, cement, fly ash and the like account for 11.9-17.7% of the wet weight of the sludge. Landfill is the simplest method for treating sludge, but the content of each pollutant in the sludge is strictly maintained within the range specified by the national standard. The incineration method is the most thorough method for treating sludge, and the heat energy generated in the incineration process can be recovered properly, so that the method has wide application prospect and is worthy of further development. As disclosed in patent CN113698973a, a treatment method for recycling organic sludge is disclosed, wherein the pH value, MLSS and COD of the organic sludge are made to reach preset values by biologically treating the organic sludge; conditioning the biologically treated organic sludge with a polymer; dewatering and drying the polymer conditioned organic sludge; and granulating the dehydrated and dried organic sludge to prepare the biomass fuel. However, this method requires the use of biological treatment processes, is complicated in equipment, and cannot effectively utilize the calorific value of organic pollutants therein. Patent CN110835568A discloses a preparation method of sludge derived fuel for hazardous waste disposal, which takes sludge powder as main material, and auxiliary materials including auxiliary fuel fine powder, industrial solid waste fine powder, regulator powder, sulfur-fixing deacidification agent powder, adhesive powder and humidity-adjusting water, and the sludge derived fuel is obtained by conveying the sludge powder to a mixer for fully and uniformly mixing and stirring, extruding, stirring and drying after molding. However, the sludge derived fuel has a low calorific value (1800 kcal/kg), poor combustion performance, and no study on the dehydration process of wet sludge was made.
The most commonly used method for dewatering sludge at present is mechanical dewatering, but high-water-content organic sludge presents colloid stability, molecular substances are very tightly combined with water, and the water content of the sludge is difficult to be reduced to below 80% no matter which type of filter press is adopted. In recent years, a combination of flocculation and mechanical dewatering has been developed to dewater sludge. Adding a flocculating agent into the organic sludge to enable micromolecular substances in the sludge to be agglomerated to generate macromolecular substances and to be precipitated, so that the colloid stability of the macromolecular substances is destroyed and the macromolecular substances are easier to dehydrate. However, the conventional agent has weak dehydration performance, large agent addition amount and complex process, and the influence of the mechanical property of the sludge is often ignored. If the mechanical properties of the sludge are poor, capillary channels among the sludge collapse under the action of filter pressing, the removal of moisture is affected, and the improvement of the mechanical properties is also beneficial to the subsequent transportation and recycling application. Patent CN101985386a discloses a conditioner for dewatering domestic sludge and a conditioning method, and the agents sequentially added into the sludge to be treated are polyaluminium sulfate, quicklime, bamboo charcoal, polyacrylamide, quaternary ammonium salt and the like under the conditions of normal temperature and normal pressure. And patent CN109928603a discloses a preparation method and a use method of a green sludge dewatering agent, wherein the dewatering agent consists of a filter aid, a flocculating agent and an oxidizing agent. The dewatered sludge obtained by the patent has lower heat value, and the produced mud cake has lower mechanical property and is not suitable for subsequent treatment and resource utilization as fuel. Therefore, the method can promote the efficient dehydration of organic sludge with different properties, and simultaneously can lead the produced mud cake to have good mechanical property and the research and development of dehydration medicament with high social and economic benefits.
If the organic sludge is not fully combusted, toxic and harmful substances such as dioxin and the like which cause secondary pollution can be generated, so that the reduction of the generation of the dioxin ensures that the organic sludge is completely combusted, and is also a great difficulty in the application of the organic sludge as fuel. In the existing process for preparing fuel from organic sludge, a large amount of oxidant, raw coal or other fossil fuel is required to be added to ensure that the sludge is fully combusted, so that the process is unfavorable for consuming a large amount of organic waste and saving the raw coal. Patent CN107974325A discloses an environment-friendly coal-saving combustion improver for a power plant and a preparation method thereof, wherein the content of the oxidant is up to 35-70%, and the content of sludge is less than 20%. Patent CN106753648A discloses an environment-friendly biomass composite fuel prepared from sludge garbage and a preparation method thereof, and the synthetic fuel prepared by the method has large content of fire coal and high cost. Therefore, a green, environment-friendly and efficient method capable of fully burning sludge and saving raw coal is needed.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the primary aim of the invention is to provide a recycling treatment method for preparing high-heating-value fuel by using dehydrated organic sludge.
Another object of the present invention is to provide a high heating value fuel prepared by the above method.
The invention aims at realizing the following technical scheme:
a recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge comprises the following steps:
uniformly stirring and mixing the dried organic sludge with the water content of 18-25%, a combustion improver, a catalyst, a desulfurizing agent and a heat value lifting agent, and then performing compression molding to obtain the high heat value fuel; the combustion improver comprises potassium nitrate, magnesium nitrate, sodium chlorate, ferrocene and potassium persulfate; the catalyst comprises calcium carbonate, alumina, manganese dioxide and quartz sand; the desulfurizing agent comprises calcium oxide, calcium hydroxide and epoxy resin; the heating value improver comprises waste oil and biomass fuel.
Further, the high-calorific-value fuel comprises the following components in percentage by mass: 50-70% of dried organic sludge, 10-30% of combustion improver, 3-5% of catalyst, 1-7% of desulfurizing agent and 10-20% of heat value improver.
Further, the combustion improver comprises the following components in percentage by mass: 30-80% of potassium nitrate, 0-40% of magnesium nitrate, 0-10% of sodium chlorate, 0-10% of ferrocene and 0-10% of potassium persulfate.
Further, the catalyst comprises the following components in percentage by mass: 30-40% of calcium carbonate, 40-50% of alumina, 10-20% of manganese dioxide and 0-10% of quartz sand.
Further, the desulfurizing agent comprises the following components in percentage by mass: 40-50% of calcium oxide, 40-50% of calcium hydroxide and 0-20% of epoxy resin.
Further, the heat value improver comprises the following components in percentage by mass: waste oil 0-100% and biomass fuel 0-100%.
Further, the dried organic sludge is prepared by the following method:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge for mixing reaction for 5-30 min; the skeleton structure agent consists of CaO, ca (OH) 2 Activated white mud and activated carbon;
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 5-30 min; the flocculation modifier consists of polymeric ferric sulfate, polymeric aluminum sulfate and a surfactant;
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 5-30 min; the flocculant consists of quaternary ammonium salt and polyacrylamide;
(4) Carrying out filter pressing dehydration on the mixed sludge treated in the step (3) to obtain dehydrated sludge;
(5) And (3) carrying out low-temperature drying treatment on the dehydrated sludge obtained in the step (4) to obtain dried organic sludge.
Further, the water content of the organic sludge in the step (1) is 30% -99%.
Further, in the step (1), the skeleton structure agent comprises the following components in percentage by mass: 30% -50% of CaO, ca (OH) 2 30% -40% of active white mud 10% -ultra20 percent of active carbon and 10 to 20 percent of active carbon.
Further preferably, the addition amount of the framework structure agent is 0.01-0.02 kg/L of sludge.
Further, in the step (2), the flocculation modifier comprises the following components in percentage by mass: 20-75% of polymeric ferric sulfate, 20-75% of polymeric aluminum sulfate and 5-10% of surfactant. The surfactant is preferably sodium stearate.
Further preferably, the addition amount of the flocculation modifier is 0.01-0.02 kg/L of sludge.
Further, in the step (3), the flocculant comprises the following components in percentage by mass: 40-80% of quaternary ammonium salt and 20-60% of polyacrylamide. The quaternary ammonium salt is selected from chitosan quaternary ammonium salt, polydimethyl diallyl ammonium chloride or polysiloxane quaternary ammonium salt. More preferably a silicone quaternary ammonium salt. In the sludge dewatering process, polysiloxane quaternary ammonium salt is adopted, so that the sludge dewatering performance is better improved than that of other quaternary ammonium salts.
Further preferably, the addition amount of the flocculant is 0.01-0.02 g/L of sludge.
Further, in the step (4), a plate-and-frame filter press is adopted for filter pressing and dehydration, and the dehydration pressure is 1-2 MPa.
Further, the calorific value of the dried organic sludge in the step (5) is 3000-4500 kcal/kg
The high-heat-value fuel is prepared by the method, and the heat value of the high-heat-value fuel is 3500-5000 kcal/kg.
Compared with the prior art, the invention has the beneficial effects that:
(1) The fuel prepared by the invention takes the organic sludge as a main body, does not contain fossil fuel, has less oxidant consumption, low cost and full combustion, and does not generate secondary pollutants such as dioxin. Solves the problems of high water content, low heat value, insufficient combustion as fuel, easy secondary pollutant generation and the like of the organic sludge.
(2) The invention solves the problem of difficult dehydration of the sludge with high water content and colloid stability. The water content of the dehydrated sludge cake can be reduced to 15-25%; the dosage is small, the total dosage of the conditioner is about 5% of the mass of the water-containing sludge, and compared with single agent, the dosage of quicklime is reduced by 50% -80%, and the dry-basis dosage is reduced by at least 50%, so that the weight of dry solid matters of the sludge is increased within a controllable range. The heavy metal in the sludge can be effectively solidified, the effective components in the medicament are combined with the heavy metal in the sludge and are converted into insoluble precipitate to be solidified in the sludge, and the risk of heavy metal pollution is reduced. The solid-liquid separation effect is obvious, the water after filter pressing hardly contains macromolecular organic matters, and the obtained desiccated organic sludge has high heat value.
(3) According to the invention, the skeleton structure agent, the flocculation modifier and the flocculant are designed, and the specific treatment sequence is combined, so that the dehydration efficiency and the low-temperature drying efficiency can be remarkably improved, and the obtained dried organic sludge can be directly used for preparing high-heat-value fuel. The obtained fuel with high calorific value is fully combusted, almost no smoke dust is generated, and secondary pollutants such as dioxin and the like are not generated.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
The recycling treatment method for preparing the high-calorific-value fuel by using the dehydrated organic sludge in the embodiment comprises the following steps:
according to the mass percentage, 60% of dried organic sludge, 20% of combustion improver, 4% of catalyst, 4% of desulfurizing agent and 12% of heat value lifting agent are added into a stirrer to be stirred and mixed uniformly, then the uniformly stirred mixture is put into a compressor to be compressed into a cake shape, and the high heat value fuel is obtained after molding.
The combustion improver comprises the following components in percentage by mass: 60% of potassium nitrate, 20% of magnesium nitrate, 8% of sodium chlorate, 8% of ferrocene and 4% of potassium persulfate.
The catalyst comprises the following components in percentage by mass: 35% of calcium carbonate, 45% of alumina, 15% of manganese dioxide and 5% of quartz sand.
The desulfurizing agent comprises the following components in percentage by mass: 40% of calcium oxide, 45% of calcium hydroxide and 15% of epoxy resin.
The heat value improver comprises the following components in percentage by mass: 60% of waste oil and 40% of biomass fuel.
The dried organic sludge is prepared by the following method:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97%, and mixing and reacting for 15min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon; the adding amount of the framework structure agent is 0.015kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 15min; the flocculation modifier consists of 50% of polymeric ferric sulfate, 42% of polymeric aluminum sulfate and 8% of sodium stearate; the addition amount of the flocculation modifier is 0.015kg/L of sludge.
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 15min; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge.
(4) Press-filtering and dehydrating the mixed sludge treated in the step (3) under the pressure of 1.6MPa by a plate-and-frame filter press to obtain dehydrated sludge; the water content of the dewatered sludge was measured to be 48%.
(5) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (4) to obtain the dried organic sludge with the water content of 19%.
The calorific value of the dried organic sludge obtained in the embodiment is 3600kcal/kg; the calorific value of the obtained high calorific value fuel was 4200kcal/kg.
The combustion test of the dried organic sludge obtained in the embodiment and the prepared high-heat-value fuel shows that the dried organic sludge can be combusted in a self-sustaining manner, but the combustion is insufficient, a large amount of smoke dust is generated, and the concentration of dioxin is detected to be 23.8ng TEQ/m 3 . The obtained high-calorific-value fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected. The high heating value fuel obtained by the invention has obviously improved combustion performance.
Comparative example 1
In this comparative example, compared to example 1, the high heating value fuel lacks the combustion improver component and is prepared from 80% of dried organic sludge, 4% of catalyst, 4% of desulfurizing agent and 12% of heating value improver.
The high heat value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted to generate a large amount of smoke and the dioxin concentration was detected to be 15.3ng TEQ/m 3 。
Comparative example 2
In this comparative example, compared with example 1, the high calorific value fuel lacks the catalyst component and is prepared from 64% of dried organic sludge, 20% of combustion improver, 4% of desulfurizing agent and 12% of calorific value improver.
The high heat value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted, a little smoke was generated, and the dioxin concentration was detected to be 12.5 gteQ/m 3 。
As can be seen from a comparison of the embodiment 1 and the comparative examples 1-2, the combustion performance of the dried organic sludge can be remarkably improved by adding the specific combustion improver and the catalyst, and the obtained fuel has the advantages of full combustion and no secondary pollutants such as dioxin.
Comparative example 3
Compared with the example 1, the preparation process of the dried organic sludge does not add a framework structural agent for reaction, and the rest steps are the same.
The water content of the dehydrated sludge after the treatment of the comparative example is 77%; the water content of the dried organic sludge is 64%, and the heat value is 700kcal/kg; the calorific value of the obtained high calorific value fuel was 1900kcal/kg.
The high heat value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted, a little smoke was generated, and the dioxin concentration was detected to be 7.2 gteQ/m 3 。
As can be seen from the comparison result of the comparative example and the example 1, the framework structure agent provided by the invention is used as a framework of the mud cake to increase the structural strength of the mud cake, so that water is easy to remove from the mud cake, the solid-liquid separation effect is obvious, and the low-temperature drying efficiency is improved. The obtained dried organic sludge and the prepared fuel have high heat value, are fully combusted and do not produce secondary pollutants such as dioxin and the like.
Comparative example 4
Compared with the example 1, the preparation process of the dried organic sludge is free from adding flocculation modifier, and the rest steps are the same.
The water content of the dehydrated sludge after the treatment of the comparative example is 63%; the water content of the dried organic sludge is 44%, and the heat value is 2000kcal/kg; the calorific value of the obtained high calorific value fuel was 2700kcal/kg.
The high heat value fuel obtained in the comparative example is subjected to combustion test, and the result shows that the fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected.
As can be seen from the comparison result of the comparative example and the example 1, the flocculation modifier provided by the invention has the effects of strengthening flocculation precipitation, reducing the content of organic matters in sewage after filter pressing, strengthening filtration and improving low-temperature drying efficiency, and obviously improves the heat value of dried organic sludge and fuel.
Comparative example 5
In this comparative example, the dried organic sludge was prepared without adding a flocculant to react, and the remaining steps were the same as in example 1.
The water content of the dehydrated sludge after the treatment of the comparative example is 72 percent; the water content of the dried organic sludge is 61%, and the heat value is 800kcal/kg; the calorific value of the obtained high calorific value fuel was 2100kcal/kg.
The high heat value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted, a little smoke was generated, and the dioxin concentration was detected to be 5.7 gteQ/m 3 。
As can be seen from the comparison result of the comparative example and the example 1, the flocculant provided by the invention has the advantages of improving the dehydration performance of the sludge, promoting the dehydration of the sludge, rapidly realizing the reduction of the sludge and removing most of organic matters in the water. The obtained dried organic sludge and the prepared fuel have high heat value, are fully combusted and do not produce secondary pollutants such as dioxin and the like.
Comparative example 6
In this comparative example, the process of preparing dried organic sludge was the same as that of example 1 in which the skeletal structure agent, the flocculation modifier and the flocculant were added at one time to react for 45 minutes.
The water content of the dehydrated sludge after the treatment of the comparative example is 64%; the water content of the dried organic sludge is 46%, and the heat value is 1600kcal/kg; the calorific value of the obtained high calorific value fuel was 2500kcal/kg.
The high heating value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted, a little smoke was generated, and dioxin secondary pollutants were not detected.
As can be seen from the comparison result of the comparative example and the example 1, compared with the method of adding each conditioner at one time, the method of the invention has the advantages that the dehydration efficiency and the low-temperature drying efficiency can be obviously improved by firstly adding the skeleton structure agent for reaction and then sequentially adding the flocculation modifier for reaction and the flocculant for reaction, and the obtained dried organic sludge and the prepared fuel have high heat value.
Comparative example 7
Compared with the example 1, the preparation process is that the skeleton structure agent is firstly added for reaction for 15min, then the flocculation modifier and the flocculant are added at one time for reaction for 30min, and the rest are the same.
The water content of the dehydrated sludge after the treatment of the comparative example is 60%; the water content of the dried organic sludge is 42%, and the heat value is 2100kcal/kg; the calorific value of the obtained high calorific value fuel was 2800kcal/kg.
The high heat value fuel obtained in the comparative example is subjected to combustion test, and the result shows that the fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected.
As can be seen from the comparison result of the comparative example and the example 1, compared with the reaction by adding the flocculation modifier and the flocculant in batches, the one-time addition of the flocculation modifier and the flocculant for reaction can remarkably improve the dehydration efficiency and the low-temperature drying efficiency, and the obtained dried organic sludge and the prepared fuel have high heat value.
Comparative example 8
Compared with the example 1, the preparation process is that the skeleton structure agent and the flocculation modifier are firstly added at one time to react for 30min, then the flocculant is added to react for 15min, and the rest are the same.
The water content of the dehydrated sludge after the treatment of the comparative example is 63%; the water content of the dried organic sludge is 45 percent, and the heat value is 1900kcal/kg; the calorific value of the obtained high calorific value fuel was 2600kcal/kg.
The high heat value fuel obtained in the comparative example is subjected to combustion test, and the result shows that the fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected.
As can be seen from the comparison result of the comparative example and the example 1, compared with the reaction by adding the skeleton structure agent and the flocculation modifier in batches, the one-time addition of the skeleton structure agent and the flocculation modifier for reaction can remarkably improve the dehydration efficiency and the low-temperature drying efficiency, and the obtained dried organic sludge and the prepared fuel have high heat value.
Comparative example 9
Compared with the example 1, the preparation process is that the skeleton structure agent and the flocculating agent are firstly added at one time to react for 30min, then the flocculating modifier is added to react for 30min, and the rest are the same.
The water content of the dehydrated sludge after the treatment of the comparative example is 71%; the water content of the dried organic sludge is 56%, and the heat value is 1100kcal/kg; the calorific value of the obtained high calorific value fuel is 2300kcal/kg.
The high heat value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted, a little smoke was generated, and the dioxin concentration was detected to be 4.5 gteQ/m 3 。
As can be seen from the comparison result of the comparative example and the example 1, compared with the method that the framework structure agent and the flocculating agent are firstly added for reaction at one time and then the flocculation modifier is added for reaction, the method can obviously improve the dehydration efficiency and the low-temperature drying efficiency by firstly adding the framework structure agent for reaction and then sequentially adding the flocculation modifier for reaction and the flocculating agent for reaction, and the obtained dried organic sludge and the prepared fuel have high heat value. The fuel burns fully and does not produce secondary pollutants such as dioxin.
Comparative example 10
Compared with the example 1, the preparation process is that the flocculation modifier and the flocculant are firstly added at one time to react for 30min, then the framework structure agent is added to react for 15min, and the rest are the same.
The water content of the dehydrated sludge after the treatment of the comparative example is 75 percent; the water content of the dried organic sludge is 63% and the heat value is 750kcal/kg; the calorific value of the obtained high calorific value fuel was 2000kcal/kg.
The high heat value fuel obtained in this comparative example was subjected to combustion test, and the result showed that the fuel was not sufficiently combusted, a little smoke was generated, and the dioxin concentration was detected to be 6.6ng TEQ/m 3 。
As can be seen from the comparison result of the comparative example and the example 1, the invention can obviously improve the dehydration efficiency and the low-temperature drying efficiency by firstly adding the framework structure agent for reaction and then sequentially adding the flocculation modifier for reaction and the flocculant for reaction, compared with the mode of firstly adding the flocculation modifier for reaction and the flocculant for reaction and then adding the framework structure agent for reaction, the obtained dried organic sludge and the prepared fuel have high heat value. The fuel burns fully and does not produce secondary pollutants such as dioxin.
Example 2
The recycling treatment method for preparing the high-calorific-value fuel by using the dehydrated organic sludge in the embodiment comprises the following steps:
according to the mass percentage, adding 55% of dried organic sludge, 15% of combustion improver, 5% of catalyst, 5% of desulfurizing agent and 20% of heat value lifting agent into a stirrer, stirring and mixing uniformly, then putting the uniformly stirred mixture into a compressor, compressing into a cake shape, and forming to obtain the high heat value fuel.
The combustion improver comprises the following components in percentage by mass: 80% of potassium nitrate, 10% of ferrocene and 10% of potassium persulfate.
The catalyst comprises the following components in percentage by mass: 30% of calcium carbonate, 50% of aluminum oxide and 20% of manganese dioxide.
The desulfurizing agent comprises the following components in percentage by mass: 50% of calcium oxide and 50% of calcium hydroxide.
The heat value improver comprises the following components in percentage by mass: 100% of waste oil.
The dried organic sludge is prepared by the following method:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97%, and mixing and reacting for 10min; the skeleton structure agent consists of 30% of CaO and 30% of Ca (OH) 2 20% of active white mud and 20% of active carbon; the adding amount of the framework structure agent is 0.02kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 10min; the flocculation modifier consists of 20% of polymeric ferric sulfate, 75% of polymeric aluminum sulfate and 5% of sodium stearate; the addition amount of the flocculation modifier is 0.02kg/L of sludge.
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 10min; the flocculant consists of 80% of chitosan quaternary ammonium salt and 20% of polyacrylamide; the addition amount of the flocculant is 0.02g/L of sludge.
(4) Press-filtering and dehydrating the mixed sludge treated in the step (3) under the pressure of 1.6MPa by a plate-and-frame filter press to obtain dehydrated sludge; the water content of the dewatered sludge was measured to be 45%.
(5) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (4) to obtain the dried organic sludge with the water content of 16%.
The calorific value of the dried organic sludge obtained in the embodiment is 3800kcal/kg; the calorific value of the obtained high calorific value fuel was 4500kcal/kg.
The combustion test of the dried organic sludge obtained in the embodiment and the prepared high-heat-value fuel shows that the dried organic sludge can be combusted in a self-sustaining manner, but the combustion is insufficient, a large amount of smoke dust is generated, and the concentration of dioxin is detected to be 16.2ng TEQ/m 3 . The obtained high-calorific-value fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected. The high heating value fuel obtained by the invention has obviously improved combustion performance.
Example 3
The recycling treatment method for preparing the high-calorific-value fuel by using the dehydrated organic sludge in the embodiment comprises the following steps:
according to the mass percentage, adding 70% of dried organic sludge, 10% of combustion improver, 5% of catalyst, 5% of desulfurizing agent and 10% of heat value lifting agent into a stirrer, stirring and mixing uniformly, then putting the uniformly stirred mixture into a compressor, compressing into a cake shape, and forming to obtain the high heat value fuel.
The combustion improver comprises the following components in percentage by mass: 30% of potassium nitrate, 40% of magnesium nitrate, 10% of sodium chlorate, 10% of ferrocene and 10% of potassium persulfate.
The catalyst comprises the following components in percentage by mass: 40% of calcium carbonate, 40% of alumina, 10% of manganese dioxide and 10% of quartz sand.
The desulfurizing agent comprises the following components in percentage by mass: 40% of calcium oxide, 40% of calcium hydroxide and 20% of epoxy resin.
The heat value improver comprises the following components in percentage by mass: 100% of biomass fuel.
The dried organic sludge is prepared by the following method:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97% for mixing reaction for 30min; the skeleton structure agent consists of 40% of CaO and 40% of Ca (OH) 2 10% of active white mud and 10% of active carbon; the adding amount of the framework structure agent is 0.01kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 30min; the flocculation modifier consists of 70% of polymeric ferric sulfate, 20% of polymeric aluminum sulfate and 10% of sodium stearate; the addition amount of the flocculation modifier is 0.01kg/L of sludge.
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 30min; the flocculant consists of 40% of chitosan quaternary ammonium salt and 60% of polyacrylamide; the addition amount of the flocculant is 0.01g/L of sludge.
(4) Press-filtering and dehydrating the mixed sludge treated in the step (3) under the pressure of 1.6MPa by a plate-and-frame filter press to obtain dehydrated sludge; the water content of the dewatered sludge was measured to be 50%.
(5) And (3) carrying out low-temperature drying treatment (60 ℃ for 2.5 h) on the dehydrated sludge obtained in the step (4) to obtain the dried organic sludge with the water content of 20%.
The calorific value of the dried organic sludge obtained in the embodiment is 3500kcal/kg; the calorific value of the obtained high calorific value fuel is 4000kcal/kg.
The combustion test of the dried organic sludge obtained in the embodiment and the prepared high-heat-value fuel shows that the dried organic sludge can be combusted in a self-sustaining manner, but the combustion is insufficient, a large amount of smoke dust is generated, and the concentration of dioxin is detected to be 19.5ng TEQ/m 3 . The obtained high-calorific-value fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected. The high heating value fuel obtained by the invention has obviously improved combustion performance.
Example 4
In this example, compared with example 3, the quaternary ammonium salt component in the flocculant in the preparation process of the dried organic sludge adopts polydimethyldiallyl ammonium chloride to replace chitosan quaternary ammonium salt, and the rest are the same.
The water content of the dehydrated sludge treated by the embodiment is 48%, and the water content of the dried organic sludge is 18%. The calorific value of the dried organic sludge is 3600kcal/kg; the calorific value of the obtained high calorific value fuel was 4100kcal/kg.
Example 5
In this example, compared with example 3, the quaternary ammonium salt component in the flocculant in the preparation process of the dried organic sludge adopts polysiloxane quaternary ammonium salt-16 to replace chitosan quaternary ammonium salt, and the rest are the same.
The water content of the dehydrated sludge treated by the embodiment is 42%, and the water content of the dried organic sludge is 15%. The calorific value of the dried organic sludge is 3900kcal/kg; the calorific value of the obtained high calorific value fuel was 4500kcal/kg.
The results of examples 3 to 5 show that the quaternary ammonium salt component in the flocculant adopts polysiloxane quaternary ammonium salt, so that the flocculant has better sludge dewatering improving performance compared with other quaternary ammonium salts, the water content of dewatered sludge and dried organic sludge is further remarkably reduced, better dewatering effect can be achieved under the condition of less conditioner consumption, and the heat value of the dried organic sludge and the prepared fuel is remarkably improved.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (4)
1. A recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge is characterized by comprising the following steps:
uniformly stirring and mixing the dried organic sludge with the water content of 15% -25%, the combustion improver, the catalyst, the desulfurizing agent and the heat value lifting agent, and then performing compression molding to obtain the high heat value fuel; the combustion improver comprises potassium nitrate, magnesium nitrate, sodium chlorate, ferrocene and potassium persulfate; the catalyst comprises calcium carbonate, alumina, manganese dioxide and quartz sand; the desulfurizing agent comprises calcium oxide, calcium hydroxide and epoxy resin; the heat value improver comprises waste oil and biomass fuel;
the high-calorific-value fuel comprises the following components in percentage by mass: 50-70% of dried organic sludge, 10-30% of combustion improver, 3-5% of catalyst, 1-7% of desulfurizing agent and 10-20% of heat value improver;
the combustion improver comprises the following components in percentage by mass: 30% -80% of potassium nitrate, 0% -40% of magnesium nitrate, 0% -10% of sodium chlorate, 0% -10% of ferrocene and 0% -10% of potassium persulfate; the catalyst comprises the following components in percentage by mass: 30-40% of calcium carbonate, 40-50% of aluminum oxide, 10-20% of manganese dioxide and 0-10% of quartz sand;
the desulfurizing agent comprises the following components in percentage by mass: 40-50% of calcium oxide, 40-50% of calcium hydroxide and 0-20% of epoxy resin;
the heat value improver comprises the following components in percentage by mass: 0-100% of waste oil and 0-100% of biomass fuel;
the dried organic sludge is prepared by the following method:
(1) Under the stirring condition, adding a framework structural agent into the organic sludge for mixing reaction for 5-30 min; the skeleton structure agent consists of CaO, ca (OH) 2 Activated white mud and activated carbon;
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 5-30 min; the flocculation modifier consists of polymeric ferric sulfate, polymeric aluminum sulfate and a surfactant;
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 5-30 min; the flocculant consists of quaternary ammonium salt and polyacrylamide;
(4) Carrying out filter pressing dehydration on the mixed sludge treated in the step (3) to obtain dehydrated sludge;
(5) Drying the dehydrated sludge obtained in the step (4) at low temperature to obtain dried organic sludge;
the skeleton structure agent in the step (1) comprises the following components in percentage by mass: caO30% -50%, ca (OH) 2 30-40%, 10-20% of activated white mud and 10-20% of activated carbon; the adding amount of the framework structure agent is 0.01-0.02 kg/L of sludge;
the flocculation modifier in the step (2) comprises the following components in percentage by mass: 20% -75% of polymeric ferric sulfate, 20% -75% of polymeric aluminum sulfate and 5% -10% of surfactant; the addition amount of the flocculation modifier is 0.01-0.02 kg/L of sludge;
the flocculant in the step (3) comprises the following components in percentage by mass: 40-80% of quaternary ammonium salt and 20-60% of polyacrylamide; the adding amount of the flocculant is 0.01-0.02 g/L of sludge.
2. The recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge according to claim 1, wherein the water content of the organic sludge in the step (1) is 30% -99%.
3. The recycling treatment method for preparing high-heat-value fuel by using dehydrated organic sludge according to claim 1, wherein the heat value of the dried organic sludge in the step (5) is 3000-4500 kcal/kg.
4. A high heating value fuel, characterized in that it is prepared by the method of any one of claims 1 to 3, and has a heating value of 3500 to 5000kcal/kg.
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