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US20080017086A1 - Method for Treating Sludge of the Sewage Treatment Plants by Using Circulating Fluidized Bed Combustion - Google Patents

Method for Treating Sludge of the Sewage Treatment Plants by Using Circulating Fluidized Bed Combustion Download PDF

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Publication number
US20080017086A1
US20080017086A1 US10/592,045 US59204505A US2008017086A1 US 20080017086 A1 US20080017086 A1 US 20080017086A1 US 59204505 A US59204505 A US 59204505A US 2008017086 A1 US2008017086 A1 US 2008017086A1
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Prior art keywords
sludge
fluidized bed
coal
circulating fluidized
coal mixture
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English (en)
Inventor
Dawei Zhang
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Shenyang David International Machinery and Electric Equipment Co Ltd
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Shenyang David International Machinery and Electric Equipment Co Ltd
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Assigned to SHENYANG DAVID INTERNATIONAL MACHINERY & ELECTRIC EQUIPMENT CO., LTD. reassignment SHENYANG DAVID INTERNATIONAL MACHINERY & ELECTRIC EQUIPMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZHANG, DAWEI
Publication of US20080017086A1 publication Critical patent/US20080017086A1/en
Assigned to ZHANG, DAWEI reassignment ZHANG, DAWEI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHENYANG DAVID INTERNATIONAL MACHINERY & ELECTRIC EQUIPMENT CO., LTD.
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment 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
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/70—Blending
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2203/00—Furnace arrangements
    • F23G2203/50—Fluidised bed furnace
    • F23G2203/501—Fluidised bed furnace with external recirculation of entrained bed material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2204/00—Supplementary heating arrangements
    • F23G2204/10—Supplementary heating arrangements using auxiliary fuel
    • F23G2204/101—Supplementary heating arrangements using auxiliary fuel solid fuel
    • 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
    • Y02E20/12—Heat utilisation in combustion or incineration of waste
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

Definitions

  • This invention relates to a method for treating sewage and sludge, especially a method for treating sludge of the sewage treatment plants by using the circulating fluidized bed combustion for the purpose of harmless treatment and comprehensive utilization of the sludge produced from the urban sewage treatment plants.
  • a large number of sludge is produced during the processing of the urban sewage, resulting in difficult problem to the sewage treatment plants to treat the sludge.
  • an object of the present invention is to provide a method for treating sludge of the sewage treatment plants by using the circulating fluidized bed combustion for the purpose of harmless treatment and comprehensive utilization of the sludge produced from the urban sewage treatment plants and thus favorableness for the environmental protection.
  • the technical scheme by which this invention can solve the problem and reach the invention purpose is to provide a method for treating sludge of the sewage treatment plants by using circulating fluidized bed boiler combustion, comprising:
  • b. clean burning step of the sludge coal mixture by feeding the prepared sludge coal mixture into a circulating fluidized bed boiler for clean burning, wherein a furnace of the circulating fluidized bed boiler contains fluidized media of quartz sand and limestone.
  • the part by weight of the components of the sludge coal mixture is such as 10-20 parts for sludge, 50-60 parts for fine coal, 20-25 parts for water and 2-5 parts for dispersant and the fine coal is 50-150 ⁇ m in diameter.
  • the sludge used in said preparing steps of the sludge coal mixture is the resulted coal sludge which is formed by such way that the sewage from the sewage treatment plants is adsorbed and filtered by fine coal and calcium oxide so as to remove impurities from the sewage.
  • Said preparing steps of the sludge coal mixture of the method for treating sludge of the sewage treatment plants by using the circulating fluidized bed combustion further comprise a step of injecting said sludge coal mixture by a screw pump, from the middle or top of the circulating fluidized bed boiler and the combustion temperature of the circulating fluidized bed boiler is controlled at 850-950° C.
  • said clean burning steps of the sludge coal mixture in the method for treating sludge of the sewage treatment plants by using circulating fluidized combustion further comprises a step of separating and catching un-burned off coal and waste particles carried out together with the hot flue gas by a fly ash separator installed at the outlet or rear of a combustion furnace of said circulating fluidized bed boiler, and then delivering them back into the dense-phase area of the combustion furnace from a returning device under the separator for the purpose of circulating combustion.
  • a method for treating sludge of the sewage treatment plants by using circulating fluidized bed boiler combustion comprising:
  • a. preparing step of sludge coal mixture by adding the sludge and dispersant into the pea coal, all which are milled in a ball mill into mixed coal slurry of 50-150 ⁇ m in granularity, then adding the stabilizing agent and stirring the mixed coal slurry to form the sludge coal mixture;
  • the furnace of circulating fluidized bed boiler contains media materials composed of quartz sand and limestone.
  • the sludge used in said preparing steps of the sludge coal mixture is the resulted coal sludge which is formed by such way that the sewage from the sewage treatment plants is adsorbed and filtered by fine coal and calcium oxide so as to remove impurities from the sewage.
  • Said preparing steps of the sludge coal mixture of the method for treating sludge of the sewage treatment plants by using the circulating fluidized bed combustion further comprise a step of injecting said sludge coal mixture by a screw pump, from the middle or top of the circulating fluidized bed boiler.
  • Said clean burning steps of the sludge coal mixture in the method for treating sludge of the sewage treatment plants by using circulating fluidized combustion further comprises a step of separating and catching un-burned off coal and waste particles carried out together with the hot flue gas by a fly ash separator installed at the outlet or rear of a combustion furnace of said circulating fluidized bed boiler, and then delivering them back into the dense-phase area of the combustion furnace from a returning device under the separator for the purpose of circulating combustion.
  • Said method according to this present invention is to prepare the sludge of the sewage treatment plants into the sludge coal mixture, and then delivered them into the circulating fluidized bed boiler for combustion, with the combustion efficiency up to 98%.
  • the inflammable matters contained in such slurry combust in the furnace and then transformed into the heat energy, while other impurities are mixed in the fly ash during the combustion to discharge.
  • the burn off fly ash contained in the flue gas from the circulating fluidized bed boiler is collected by an electrostatic dust remover or a bag collector 5 , with the dust removal rate of up to 99.9%, so that the emission concentration of the dust contained in the flue gas is less than 80 mg/m 3 , that of SO 2 in the flue gas less than 100 mg/m 3 , that of NOx less than 150 mg/m 3 and Ringelmen blackness of the flue gas lower than class I, all which meet the requirements for atmospheric environmental protection as specified in the national standard. As a result, the environmental pollution caused by fly ash can be avoided completely.
  • the circulating fluidized bed boiler burning said sludge coal mixture can be of the hot water boiler, or LP, HP or MP steam boiler and the produced steam can be used for power generation, urban heat supply or cogeneration, integrating sludge treatment and power generation or supply, so the energy and environmental protection control expenses are saved in large number.
  • the fly ash produced during combustion contains silicate and CaSO 4 both in comprehensive utilization mainly for following purposes:
  • the fly ash is the substitute for slag and gypsum to make up the insufficient slag resources and used as the raw materials for preparing the cement, i.e., mixing with the cement clinker in the proportion of 50% to prepare the 325# cement.
  • the fly ash with high CaSO 4 content can be used for preparing special cement and expansion agent.
  • the fly ash is used for making fly ash paving brick, square brick, grass brick and curbstone, etc.
  • the fly ash is used for preparing the fly ash concrete for road and airport.
  • FIG. 1 indicates a process flow diagram of using urban sewage to prepare sludge coal mixture
  • FIG. 2 indicates a process flow diagram of using pea coal and sludge from the sewage treatment plants to prepare sludge coal mixture
  • FIG. 3 indicates a process flow diagram of using fine coal and sludge from the sewage treatment plants to prepare sludge coal mixture
  • FIG. 4 is a process flow diagram showing that said sludge coal mixture is combusted in a circulating fluidized bed to produce steam and hot water.
  • this invention provides a method for treating sludge of the sewage treatment plants by using the circulating fluidized bed combustion, comprising: a. preparing step of the sludge coal mixture by adding fine coal and dispersant into sludge from the sewage treatment plants, then stirring and adding stabilizing agent; b. clean burning step of the sludge coal mixture, by feeding the prepared sludge coal mixture into the circulating fluidized bed boiler for clean burning, wherein the furnace of the circulating fluidized bed boiler contains fluidized media of quartz sand and limestone.
  • the method of preparing said sludge coal mixture can be divided into following two according to different processes used: i.e., using the sewage to prepare the sludge coal mixture and using the sludge from the sewage treatment plants to prepare the sludge coal mixture;
  • the fine coal, coal based activated carbon and CaO are added in a filter tank as the filter materials; the multi-stage filter tank can be constructed as required for the sewage processing quantity.
  • the fine coal and CaO have strong absorption ability and flocculability.
  • the clean water in the upper part of the settlement basin flows into a treatment water pond, and the solid and liquid contained in the coal slurry in the lower part of the settlement basin can be at a ratio up to 30-40%, and delivered by the screw pump under the settlement basin into the bottom flow storage tank.
  • the filter materials composed of fine coal, coal based activated carbon and CaO in the filter tank after used for a certain period, saturate to form the resulted coal sludge which now can contain up to 30 %- 40 % moisture.
  • the saturated resulted coal sludge in the filter tank is delivered by a screw pump into a bottom flow storage tank which is used as a secondary settlement basin.
  • the clean water in the upper part of the upper flow storage tank is discharged in the treatment water pond, and the lower resulted coal sludge of the storage tank is delivered by the screw pump into a slurry preparing tank.
  • the filter materials in the filter tank may contain certain quantity of the calcium hydroxide and play roles of denitrification, dephophorization, decoloring and deodorization to the sewage during the filtering.
  • each batch, before mixing, shall be assayed to inspect the moisture, etc., contained in it, and then mixed with certain quantity of the fine coal in a proportion until the ratio of the coal to the moisture is up to about 6.5-7:3.5-3, and then added with the dispersant.
  • an agitator provided on the top of the slurry preparing tank is started up to mix at the rotary speed of 60 r.p.m.
  • the mixture is mixed continuously at the normal temperature and mixed with the dispersant, and then delivered in a coal sludge slurry storage tank after cut by the cutting pump and slaked. Both the dispersant and the stabilizing agent are called additive together.
  • the NDF water coal mixture additive that is developed and produced by the Surface and Interface Chemical Engineering Technology Center of the Nanjing University can be used.
  • the water in the treatment water pond is pumped into an existing sewage treatment system of the sewage treatment plant for processing again, and after reaching a standard, is discharged or utilized again.
  • Said sludge coal mixture in the slurry storage tank shall be mixed 1-2 hours a day as required so as to prevent hard settlement.
  • the preparing method can be divided into two types according to different original conditions of the coal used:
  • the pea coal is crushed in a crusher, and then weighted and delivered into a ball mill; the sludge in the sludge pool is delivered by a pump in a proportion into the ball mill, and the urban sewage in the sewage storage tank and the additive in an additive storage tank are delivered according to the parts by weight into the ball mill, i.e., 10-20 parts for sludge, 50-60 parts for fine coal, 20-25 parts for water and 2-5 parts for dispersant.
  • the coal is milled into the 50-150 ⁇ m mixed coal slurry which is delivered by the screw pump into the slurry preparing tank and then mixed and added with the stabilizing agent.
  • the mixture is cut by the cutting pump and slaked, forming the sludge coal mixture, which is then delivered into a slurry storage tank. Both the dispersant and the stabilizing agent are called additive together.
  • the NDF water coal mixture additive that is developed and produced by the Surface and Interface Chemical Engineering Technology Center of the Nanjing University can be used.
  • the fine coal in a fine coal bay, the sludge in a sludge pool, the sewage in a sewage storage tank, and the dispersant in an additive storage tank are delivered by the delivery equipment according to following parts by weight into the slurry preparing tank, i.e., 10-20 parts for sludge, 50-60 parts for fine coal, 20-25 parts for water and 2-5 parts for dispersant; in addition, the fine coal is 50-150 ⁇ m in diameter.
  • the mixture is mixed and added with the stabilizing agent (same as the above mentioned), and cut by the cutting pump and slaked to form the sludge coal mixture, which is then delivered into the slurry storage tank.
  • coal quality and the sludge must be assayed and the small test must be carried out to determine proportions of coal, sludge, urban sewage, dispersant and stabilizing agent.
  • Said sludge coal mixture in the slurry storage tank shall be mixed 1-2 hours a day as required so as to prevent hard settlement.
  • This invention provides retrofit on the circulating fluidized bed boiler 4 in order to adapt to the combustion features of the sludge coal mixture made of the sludge, as shown in FIG. 4 for the process flow.
  • the dry fine coal is used as the fuel which is delivered by a screw conveyer into the furnace from the bottom of the boiler.
  • the circulating fluidized bed boiler 4 for burning the water coal mixture is structured such that based on the conventional boiler design a sludge coal mixture inlet is set up on the top or in the middle of the boiler. If the boiler 4 only burns the sludge coal mixture, the screw coal for feeding equipment will be removed, and if it burns the coal and the sludge coal mixture, the screw coal for feeding equipment will be retained.
  • the circulating fluidized bed boiler 4 for burning the sludge coal mixture is ignited in the manner of hot air flow pattern, in which the diesel oil is atomized by an ignition gun and then burns in a pre-combustion tube; the produced high temperature flue gas enters the isobaric air chamber to heat the air in the air supply duct, and then the heated high temperature air enters a fluidized on-bed material layer through an air distribution board.
  • the materials on the bed is heated over 450° C., a little of the sludge coal mixture will be added in a circulating fluidized bed boiler, and now, the boiler rises quickly in temperature.
  • the sludge coal mixture is supplied to the circulating fluidized bed boiler 4 at high level; there are two or three slurry inlets in the middle of the medium and large boilers of 35 tons or over 29 MW, from which the sludge coal mixture is delivered into a furnace; also the sludge coal mixture can be delivered from the top of these medium and small boilers, and this way sufficiently utilizes the boiler's height to accelerate separation of the moisture and volatile matters contained in the sludge coal mixture, in favor of the combustion.
  • the sludge coal mixture is delivered by a feeding slurry pump 3 of the boiler from the slurry storage tank 1 to the circulating fluidized bed boiler 4 .
  • the sludge coal mixture enters the circulating fluidized bed boiler and then becomes drops which will become smaller particles due to disturbance of the fluidized hot air flow in the furnace and then drop downwards in the furnace at 850-950° C.
  • the sludge coal mixture drops are heated and decomposed, start burning, and then enter the fluidized bed composed of quartz sand and limestone.
  • continuous heating of the broiling materials on the fluidized bed they are removed the moisture and violate matters quickly, and then subject to combustion and coke combustion.
  • the further decomposed fine particles of the granular sludge coal mixture agglomerates under the fluidized state are carried out of the dense-phase area together with the hot flue gas and then enter the suspension chamber for further burning.
  • the media materials and large un-burned off coal and waste particles all which are carried out together with the hot flue gas are separated by a separator, and then delivered back into a dense-phase area of the combustion furnace from a returning device under the separator for the purpose of circulating combustion, with the combustion efficiency up to 98%.
  • the sludge coal mixture makes low temperature combustion in the furnace at 850-950° C. so as to effectively restrain generation of thermal NOx during combustion of the fuel.
  • the quartz sand and the limestone are used as the fluidized media to add into the furnace; the limestone is decomposed into CaO at high temperature, which acts with SO 2 produced after combustion of the sulfur contained in the fine coal in the sludge coal mixture to generate CaSO 4 .
  • the action: SO 2 +CaO+1/2O 2 CaSO 4 , restrains emission of SO 2 in the flue gas, resulting in direct desulfurization in the circulating fluidized bed boiler.
  • the limestone (desulfurating agent) added into such boiler is about 1-2 mm in size, and the mol ratio of calcium to sulfur is equal to 1.5-2.5 at the desulfurization efficiency of up to 85%-95%.
  • the inflammable matters in said sludge coal mixture burn in the furnace and then are transformed into the heat energy; during combustion, other impurities are mixed in the fly ash to emit.
  • the burn off fly ash contained in the flue gas from the circulating fluidized bed boiler is collected by an electrostatic dust remover or a bag dust remover 5 , with the dust removal rate of up to 99.9%, so that the emission concentration of the dust contained in the flue gas is less than 80 mg/m 3 , that of SO 2 in the flue gas less than 10 mg/m 3 , that of NOx less than 150 mg/m 3 and Ringelmen blackness of the flue gas lower than class I, all which meet the requirements for atmospheric environmental protection as specified in the national standard.
  • the flue gas is emitted from the stack 6 .
  • the circulating fluidized bed boiler 4 can be of a hot water boiler, or LP (low pressure), HP (high pressure) or MP (medium pressure) steam boiler and the produced steam can be used for power generation, urban heat supply or cogeneration, integrating sludge treatment and power generation or supply, so the energy and environmental protection control expenses are saved in large number.
  • LP low pressure
  • HP high pressure
  • MP medium pressure
  • the fly ash collected by the dust remover 5 after combustion of the sludge coal mixture can be utilized comprehensively.
  • the fly ash produced after clean combustion of the sludge coal mixture in the circulating fluidized bed boiler 4 is collected by the dust remover 5 , and then delivered through an enclosed delivery device into the enclosed ash silo 8 . Stacked to a certain quantity, the fly ash will be transported away by the dedicated vehicles for fly ash. The environmental pollution caused by fly ash is avoided completely.
  • the fly ash contains silicate and CaSO 4 both in comprehensive utilization mainly for following purposes:
  • the fly ash is the substitute for slag and gypsum to make up the insufficient slag resources and used as the raw materials for preparing the cement, i.e., mixing with the cement clinker in the proportion of 50% to prepare the 325# cement.
  • the fly ash with high CaSO 4 content can be used for preparing special cement and expansion agent.
  • the fly ash is used for making fly ash paving brick, square brick, grass brick and curbstone, etc.
  • the fly ash is used for preparing the fly ash concrete for road and airport.
  • An urban sewage treatment plant is taken as an example. This plant lies on the border of the city.
  • the sludge in its sewage mainly contains the organic substances and the phosphorus, and the sewage is treated and utilized comprehensively by using the circulating fluidized combustion.
  • the coal sludge resulting from absorption, settlement and filtering of the urban sewage by using the fine coal and CaO is mixed with the fine coal to form the sludge coal mixture.
  • the fine coal and CaO in 50-150 ⁇ m are added into the filter tank which is in three stages.
  • the fine coal and CaO have strong absorption and filtering abilities.
  • the clean water in the upper part of the settlement basin flows into a treatment water pond, and the resulted coal sludge in the lower part of the settlement basin can contain up to 30-40% moisture, and is delivered by the screw pump under the settlement basin into the bottom flow storage tank.
  • the filter materials composed of fine coal and CaO in the filter tank after used for a certain period, are saturated to form the resulted coal sludge which now can contain up to 30%-40% moisture.
  • the saturated resulted coal sludge in the filter tank is delivered by the screw pump into the bottom flow storage tank which is used as a secondary settlement basin.
  • the clean water in the upper part in the upper flow storage tank is discharged in the treatment water pond, and the lower resulted coal sludge in the storage tank is delivered by the screw pump into the slurry preparing tank.
  • the filter materials in the filter tank contain certain quantity of the calcium hydroxide and play roles of denitrification, dephophorization, decoloring and deodorization to the sewage during the filtering.
  • the fine coal in 29.3 MJ (MJ referred to abbreviation of megajoule, the thermal unit)/Kg, with ash content ⁇ 10% and 50-150 ⁇ m in size is selected.
  • a certain quantity of such fine coal is mixed until the ratio of the coal to the moisture is up to about 6.5-7:3.5-3, and then the dispersant accounting for 3% in the total is mixed.
  • the agitator on the top of the slurry preparing tank is started up to mix at the rotary speed of 60 r.p.m.
  • the mixture is mixed continuously at the normal temperature and then mixed with the dispersant in the same quantity as the above, and after this, the mixture is delivered into the coal sludge slurry storage tank after cut by the cutting pump and slaked. Both the dispersant and the stabilizing agent are called additive together.
  • the NDF water coal mixture additive that is developed and produced by the Surface and Interface Chemical Engineering Technology Center of the Nanjing University can be used.
  • Said sludge coal mixture in the storage tank shall be mixed 1-2 hours a day so as to prevent hard settlement.
  • Two 75t/h sludge coal mixture steam boilers of circulating fluidized bed are installed. There are two slurry inlets in the middle of the front wall of the boiler so as to delivery said sludge coal mixture into the furnace.
  • the circulating fluidized bed boiler burning the sludge coal mixture is ignited in the hot air flow pattern, in which the diesel oil is atomized by an ignition gun and then bums in the pre-combustion tube; the produced high temperature glue gas enters the isobaric air chamber to heat the air in the air supply duct, and then the heated high temperature air enters the fluidized on-bed material layer through air distribution boards.
  • the materials on the bed is heated over 450° C., a little of the sludge coal mixture will be added in the circulating fluidized bed boiler, and now, the boiler rises quickly in temperature.
  • the sludge coal mixture inlet Through the sludge coal mixture inlet, the sludge coal mixture enters the circulating fluidized bed boiler and then becomes drops which will become smaller particles due to disturbance of the fluidized hot air flow in the furnace and then drop downwards in the furnace at 850-950° C. During the drop, the sludge coal mixture drops are heated and decomposed, start burning, and then enter the fluidized bed composed of quartz sand and limestone. During continuous heating of the broiling materials on the fluidized bed, the moisture and volatile matters are removed quickly therefrom, and then the broiling materials are subjected to combustion and cake combustion.
  • the further decomposed fine particles of the granular sludge coal mixture agglomerates under the fluidized state are carried out of the dense-phase area together with the hot flue gas and then enter the suspension chamber for further burning.
  • the media materials and large un-burned off coal and waste particles all which are carried out together with the hot flue gas are separated by the separator, and then delivered back into the dense-phase area of the combustion furnace from a returning device under the separator for the purpose of circulating combustion, with the combustion efficiency up to 98%.
  • the sludge coal mixture makes low temperature combustion in the furnace at 850-950° C. so as to effectively restrain generation of thermal NOx during combustion of the fuel.
  • the quartz sand and the limestone are used as the fluidized media to add into the furnace; the limestone is decomposed into CaO at high temperature, which acts with SO 2 produced after combustion of the sulfur contained in the fine coal in the sludge coal mixture to generate CaSO 4 .
  • the action: SO 2 +CaO+1/2O 2 CaSO 4 , restrains emission of SO 2 in the flue gas, resulting in direct desulfurization in the circulating fluidized bed boiler.
  • the limestone (desulfurating agent) added into the circulating fluidized bed boiler is about 1-2 mm in size, and the mol ratio of calcium to sulfur is equal to 1.5-2.5 at the desulfurization efficiency of up to 85%-95%.
  • the inflammable matters in said sludge coal mixture burn in the furnace and then are transformed into heat energy; during combustion, other impurities are mixed in the fly ash to emit.
  • the burn off fly ash is contained in the flue gas from the circulating fluidized bed boiler and collected by an electrostatic dust remover or a bag dust remover, with the dust removal rate of up to 99.9%, so that the emission concentration of the dust contained in the flue gas is 50 mg/m 3 , that of SO 2 in the flue gas is 80 mg/m 3 , that of NOx is 90 mg/m 3 and Ringelmen blackness of the flue gas is lower than class I.
  • the same urban sewage treatment plant is taken as an example. This plant lies on the border of the city.
  • the sludge in its sewage mainly contains the organic substances and the phosphorus.
  • the sludge during the sewage treatment is treated and utilized comprehensively by using the circulating fluidized combustion.
  • Two 75t/h sludge coal mixture steam boilers of circulating fluidized bed are installed.
  • the pea coal in 29.3 MJ/Kg, with ash content ⁇ 10%, is selected.
  • the mixture prepared in the proportion of 60% coal, 15% sludge, 22% sewage and 3% dispersant is weighted by a metering device and then delivered into the ball mill for wet milling up to forming the 50-150 ⁇ m mixed coal slurry which is delivered by a screw pump into the slurry preparing tank and mixed by a agitator at the rotary speed of 60 r.p.m.
  • the mixture is added with the dispersant and after cut by a cutting pump and slaked, prepared into the sludge coal mixture which is delivered into the slurry storage tank.
  • Said sludge coal mixture shall be mixed 1-2 hours a day regularly and delivered into the sludge coal mixture steam boiler of circulating fluidized bed.
  • Two boilers burn 21-25 t sludge coal mixture per hour and produce 150 t steam in 3.9-3.5 Mpa per hour, resulting in about 20000 KW power generation.
  • the flue gas after combustion is dedusted by an electrostatic dust remover to emit.
  • the boiler's dust removal rate, the emission concentration of the injurants contained in the flue gas and the Ringelmen blackness of the flue gas all meet the atmospheric environmental protection requirements as specified in the national standard.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
US10/592,045 2004-03-10 2005-01-14 Method for Treating Sludge of the Sewage Treatment Plants by Using Circulating Fluidized Bed Combustion Abandoned US20080017086A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN200410021357.4 2004-03-10
CNA2004100213574A CN1559939A (zh) 2004-03-10 2004-03-10 循环流化燃烧法处理污水处理厂污泥的方法
PCT/CN2005/000058 WO2005085143A1 (fr) 2004-03-10 2005-01-14 Procede de traitement des boues d'epuration par combustion en lit fluidise circulant

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US (1) US20080017086A1 (zh)
CN (1) CN1559939A (zh)
WO (1) WO2005085143A1 (zh)

Cited By (10)

* Cited by examiner, † Cited by third party
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RU2456248C1 (ru) * 2010-12-23 2012-07-20 Учреждение Российской академии наук Институт катализа им. Г.К. Борескова Сибирского отделения РАН Каталитический реактор для переработки осадков сточных вод и способ их переработки (варианты)
RU2527238C1 (ru) * 2013-05-24 2014-08-27 Общество с ограниченной ответственностью "Уникат" Способ обезвреживания органических отходов и нефти
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