WO2008061430A1 - Combustible mixte à base de boues et de charbon et procédé d'utilisation associé - Google Patents

Combustible mixte à base de boues et de charbon et procédé d'utilisation associé Download PDF

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Publication number
WO2008061430A1
WO2008061430A1 PCT/CN2007/002899 CN2007002899W WO2008061430A1 WO 2008061430 A1 WO2008061430 A1 WO 2008061430A1 CN 2007002899 W CN2007002899 W CN 2007002899W WO 2008061430 A1 WO2008061430 A1 WO 2008061430A1
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WIPO (PCT)
Prior art keywords
sludge
coal
mixed fuel
fuel
boiler
Prior art date
Application number
PCT/CN2007/002899
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English (en)
Chinese (zh)
Inventor
Dawei Zhang
Original Assignee
Dawei Zhang
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Filing date
Publication date
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Publication of WO2008061430A1 publication Critical patent/WO2008061430A1/fr

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Classifications

    • 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
    • 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
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • 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
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • 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
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • C10L1/324—Dispersions containing coal, oil and water
    • 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
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • 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
    • F23G2207/00—Control
    • F23G2207/20—Waste supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/60—Additives supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/55—Controlling; Monitoring or measuring
    • F23G2900/55011—Detecting the properties of waste to be incinerated, e.g. heating value, density
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/50—Blending
    • F23K2201/501—Blending with other fuels or combustible 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
    • 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
    • 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

  • the invention belongs to the technical field of sewage treatment, and relates to the treatment and comprehensive utilization of sludge generated in industrial wastewater and urban sewage treatment, and particularly relates to a sludge coal mixed fuel and a using method thereof. Background technique
  • the sludge produced by the sewage treatment plant is divided into primary sedimentation tank sludge, activated sludge, grid slag, sand slag, sediment and scum.
  • the composition of the sludge in the primary sedimentation tank is mainly organic matter, and the organic matter content is generally between 55 and 70%.
  • the sludge in the secondary sedimentation tank contains biological and chemical agents, and the organic matter content of the activated sludge is generally between 70 and 80%.
  • the pH of the three sludges is generally between 5.7 and 7.5.
  • the moisture content of the sludge in the sedimentation tank is generally above 95%.
  • the water content is generally about 80%, and the calorific value is generally 3,550 KJ/G.
  • the drainage network of the city is dredged, and the dredging of rivers, lakes and ditches will also produce a large amount of sludge.
  • the composition of the sludge is very complicated. It is a collection of bacteria micelles formed by various microorganisms and organic and inorganic substances adsorbed by them. In addition to containing a large amount of water (up to 99%), it also contains organic matter that is difficult to degrade. , salt, and pathogenic microorganisms and parasite eggs, etc., the sludge has high organic content, is highly prone to spoilage, and produces foul odor. In the urban sewage treatment process, bacteria and most parasites remain in the sludge, and the virus can be adsorbed. On the particles in the sewage, sedimentation with the particles is also deposited in the sludge. The number of pathogens in undigested sludge is tens of billions.
  • microorganisms include: coliform, large intestinal feces, Streptococcus faecalis, bacteriophage, Salmonella, dysentery, Bacillus thuringiensis, parasitic eggs/larvae , aphids, whipworms, group whipworms, toadstools, hymenoptera larvae, enteroviruses, etc.
  • the sludge If the sludge is discharged without treatment, it will cause serious pollution to the environment.
  • the treatment methods are generally reclamation, landfill, and incineration. Among them, reclamation has been banned by the International Law of the Sea due to serious pollution problems, and countries have basically abolished them.
  • the remaining disposal methods have their own advantages and disadvantages. From the technical difficulty comparison, the technical difficulty of landfill is the lowest, and the most difficult is the burning. In terms of investment costs, the input cost of incineration is the highest, followed by landfill. In comparison with environmental risks, there is a risk of tail gas and groundwater contamination in incineration and landfill, respectively.
  • the current circulating fluidized bed boilers are all fueled with coal with a particle size of ⁇ 13mm.
  • coal with a particle size of ⁇ 3mm is often burned out by the flue gas without full combustion. Room, and because of the grain The diameter is small, the quality is light, the cyclone separator cannot be separated, and the boiler is directly discharged with the flue gas.
  • the above phenomenon is often referred to as the boiler loss and is also the main reason for the high carbon content in the boiler fly ash.
  • the present invention provides a sludge coal mixed fuel, wherein the ratio of sludge to coal is percentage by weight: sludge accounts for 50 to 65% of the mixed fuel, and coal accounts for 35 to 50% of the mixed fuel.
  • the sludge coal mixed fuel wherein the sludge is a sludge treated by a sewage treatment plant for industrial wastewater and urban sewage; the sewage pipe network of the city is dredged, and sludge generated by dredging of rivers, lakes, and ditches.
  • the sludge coal mixed fuel wherein the sludge produced by the sewage treatment plant for treating industrial wastewater and urban sewage includes sedimentation tank sludge, activated sludge, grid slag, sand slag, sediment and scum.
  • the sludge coal mixed fuel wherein the sludge has a water content of ⁇ 85%.
  • the sludge coal mixed fuel wherein the sludge coal mixed fuel has a water content of ⁇ 50%.
  • the sludge coal mixed fuel wherein the coal has a particle size of ⁇ 3 mm.
  • the method for using the sludge coal mixed fuel of the present invention is to separately feed the sludge coal mixed fuel and the boiler fuel coal into the boiler, and the added amount of the sludge coal mixed fuel is 20-30% of the total consumption of the boiler fuel coal.
  • the method for using the sludge coal mixed fuel wherein the boiler is a circulating fluidized bed coal-fired boiler, and the sludge is symmetrically opened on the membrane wall of the combustion chamber dense phase zone and the combustion chamber lean phase zone intersection portion Coal blended fuel supply ⁇ .
  • the method for using the sludge coal mixed fuel wherein the sludge coal mixed fuel supply port position is opened before, after or left and right of the membrane wall.
  • the method for using the sludge coal mixed fuel wherein the sludge coal mixed fuel supply port is located at the front, the rear or the left and the right of the membrane wall; the sludge coal mixed fuel supply port is a steel pipe, the steel pipe The end of the connection with the membrane wall is provided with an orifice plate, and the steel pipe is flush with the membrane wall; the orifice plate is made of a steel plate, and has a circular hole with a diameter of 10-20 mm and a plum blossom type 60°; One end is fitted with a flange and can be coupled to a three-way switching valve.
  • the method for using the sludge coal mixed fuel wherein the sludge coal mixed fuel supply port is 2 to 4.
  • Figure 1 is a schematic diagram of the preparation and application process of the mixed fuel
  • 1 sludge dewatering equipment 1 sludge dewatering equipment, 2 sludge transport equipment, 3 sludge storage tanks, 4 mixers, 5 screening equipment, 6 coal conveying equipment, 7 coal powder warehouse, 8 receiving silos, 9 mixed fuel conveying equipment , 10 three-way switching valve, 11 mixed fuel delivery pipeline, 12 sludge coal mixed fuel supply port, 13 dual fuel circulating fluidized bed boiler, 14 air compressor, 15 gas storage tank, 16 cleaning pipeline, 17 reflux pipeline, 18 sedimentation tank, 19 high pressure water pump.
  • Figure 2 is a schematic diagram of a dual fuel circulating fluidized bed boiler
  • the invention treats sludge generated by industrial wastewater and urban sewage by a sewage treatment plant; dredging of the drainage pipe network of the city, sludge generated by dredging of rivers, lakes and ditches.
  • the method of the invention mixes the sludge with the boiler fuel coal to form a sludge coal mixed fuel.
  • the sludge of the present invention is:
  • Sludge from industrial wastewater and municipal wastewater treatment including sedimentation tank sludge, activated sludge, grid slag, sediment, sediment and scum.
  • the equipment used in the production and application of sludge coal blended fuel mainly consists of sludge dewatering equipment, sludge transport equipment, sludge storage tanks, screening equipment, coal conveying equipment, coal powder silos, mixers, receiving silos, and mixing.
  • the pool is composed of parts.
  • the ratio of sludge to coal is as follows: sludge accounts for 50 to 65% of the mixed fuel, coal accounts for 35 to 50% of the mixed fuel, and the prepared sludge coal blend has a water content of ⁇ 50%.
  • the sludge is dewatered by sludge dewatering equipment to reduce the water content of the sludge to ⁇ 85%.
  • the dewatering equipment can be centrifuged dewatering machine, filter press, etc., and the dewatered sludge is transported from the sludge conveying equipment to Sludge storage tank
  • the sludge storage tank is connected to two sludge transporting equipment, one of which is used to transport sludge to the sludge storage tank, and the other is used to transport the sludge in the sludge storage tank to the mixer, sludge
  • the conveying device can be a screw conveyor, a screw pump or a plunger pump.
  • the boiler fuel coal is sieved by a screening device, and the coal having a particle size of ⁇ 3 mm is sieved out and transported by the coal conveying equipment to the pulverized coal storage tank for storage.
  • the pulverized coal bin is connected with two conveying devices, one of which is used to transport the sieved coal to the pulverized coal bin, and the other is used to transport the coal in the pulverized coal bin to the mixer;
  • the screening device can be vibrated Screen or drum screen.
  • Coal conveyor equipment can use belt conveyors, wind conveyors, and screw conveyors.
  • the sludge and coal are sent to a mixer according to a determined ratio and quantity for mixing and mixing to form a sludge coal mixed fuel.
  • the prepared sludge coal mixed fuel is discharged to a receiving silo located below the mixer.
  • the feed port of the mixed fuel conveying device is connected with the receiving silo, and the discharge port of the mixed fuel conveying device is connected by the mixed fuel conveying pipe to the sludge coal mixed fuel supply port of the dual fuel circulating fluidized bed boiler; Known equipment (such as the Putzmeister PAT company in Putzmeister, Germany).
  • a three-way switching valve is installed at each end of the mixed fuel pipe between the mixed fuel conveying device and the sludge coal mixed fuel supply port of the dual fuel circulating fluidized bed boiler, and the mixed fuel conveying pipe is installed near one end of the mixed fuel conveying device.
  • the intermediate outlet of the three-way conversion wide is connected with the cleaning pipe; the intermediate outlet of the three-way switching valve installed at the end of the mixed fuel supply pipe near the sludge coal mixed fuel supply port of the dual fuel circulating fluidized bed boiler is connected with the return pipe.
  • the hybrid fuel delivery device can employ a plunger pump or a screw pump.
  • the amount of sludge coal mixed fuel added is 20 ⁇ 30% of the total fuel coal consumption of the boiler.
  • the above-mentioned devices are all well-known devices, and the invention is characterized in that two or four symmetric openings are opened on the front and rear or the left and right membrane walls of the dense phase zone and the dilute phase zone of the combustion chamber of the circulating fluidized bed coal-fired boiler. , a hole with a diameter of 56 ⁇ 160mm, installing 2 ⁇ 4 sludge coal mixed fuel supply ports, transforming the circulating fluidized bed coal-fired boiler into a dual-fuel circulating fluidized bed boiler using fuel coal and sludge coal mixed fuel .
  • the sludge coal mixed fuel supply port is made of high temperature resistant stainless steel pipe with a diameter of 50 ⁇ 150mm and a length of 500mm.
  • the port at one end of the steel pipe is connected with an orifice plate.
  • the end is installed in the opening of the membrane wall and extends into the hole.
  • the orifice plate welded at the end of the steel pipe is stamped by a stainless steel plate with a wall thickness of lOmin, and the orifice plate is covered with a circular hole with a diameter of C 10-20mm and a plum blossom type of 60°; the steel pipe of the sludge coal mixed fuel supply extends
  • the other end of the outer layer of the circulating fluidized bed coal-fired boiler is equipped with a flange and is connected with a three-way switching valve.
  • the boiler fuel coal is the main fuel of the dual fuel circulating fluidized bed boiler
  • the sludge coal mixed fuel is the auxiliary fuel of the dual fuel circulating fluidized bed boiler.
  • the amount of sludge coal blended fuel is 20 ⁇ 30% of the total fuel coal consumption of the dual fuel circulating fluidized bed boiler; the boiler fuel coal is fed into the dense phase zone of the combustion chamber of the dual fuel circulating fluidized bed boiler through the screw conveyor. Sludge coal mixed fuel from mixed fuel
  • the conveying device and the mixed fuel conveying pipe are fed into the furnace by the sludge coal mixed fuel supply port of the dual fuel circulating fluidized bed boiler.
  • the sludge coal mixed fuel enters the combustion chamber through the sludge coal mixed fuel supply port to form agglomerate.
  • the temperature of the combustion chamber is 850 ⁇ 950'C, and the moisture entering the agglomerated surface in the combustion chamber rapidly evaporates, and at the same time, agglomerates The surface begins to burn; during the process of agglomeration combustion, the water inside the agglomerates expands rapidly due to heat, causing the agglomeration to burst into small agglomerates; the small agglomerates are burnt and then burst into smaller agglomerates.
  • the agglomeration of the sludge coal mixed fuel in the lean phase region of the combustion chamber of the dual fuel circulating fluidized bed boiler belongs to a large-sized, low-density particle
  • the bed material in the dense phase region of the combustion chamber belongs to a small-sized, high-density particle.
  • the apparent density of the dense phase region of the combustion chamber is much larger than the apparent density of the lean phase region of the combustion chamber, so that the agglomeration of the coking combustion cannot fall into the dense phase region of the combustion chamber, but is "floated" in the dense phase region of the combustion chamber.
  • the super-suspended combustion prolongs the residence time of the sludge coal mixed fuel agglomeration in the dilute phase region of the combustion chamber, increases the combustion fraction of the lean phase of the combustion chamber, and the unburned agglomeration consists of a dual fuel circulating fluidized bed boiler combustion chamber.
  • the outlet installed cyclone separator is separated from the flue gas, it is re-conveyed back to the combustion chamber of the dual-fuel circulating fluidized bed boiler through the conveying pipeline to continue combustion, and is repeatedly cycled until it is burned out, and the sludge coal mixed fuel is agglomerated and burned.
  • the fly ash is discharged with the smoke.
  • a flue gas treatment facility is adopted in the boiler exhaust system to treat and eliminate harmful substances and pollutants in the flue gas.
  • the mixed fuel delivery line must be cleaned with compressed air when the mixed fuel delivery line is idle.
  • the mixed fuel delivery pipeline connected to the mixed fuel delivery equipment and the dual fuel circulating fluidized bed boiler sludge coal mixed fuel supply port, and the three-way conversion installed near the side of the mixed fuel delivery device is adjusted to the cleaning pipeline.
  • the three-way switching valve installed in the mixed fuel delivery pipe and the dual fuel circulating fluidized bed boiler sludge coal mixed fuel supply port is adjusted to be connected to the mixed fuel delivery pipe and the return pipe.
  • the three-way switch ⁇ installed on the cleaning pipe is adjusted to be connected to the high-pressure water pump, and the high-pressure water pump is started to pass the water through the three-way switching valve and the cleaning pipe into the mixed fuel delivery pipe, and the sludge coal in the mixed fuel conveying pipe is mixed.
  • the fuel residue is flushed into the settling tank by a three-way switching valve and a return pipe through a mixed fuel delivery pipe under the action of a high-pressure water stream.
  • sludge and coal need to be tested to check the moisture and calorific value of sludge and coal.
  • the ratio of sludge to coal is as follows: sludge accounts for 50 ⁇ 65% of the mixed fuel composition of sludge coal, coal accounts for 35 ⁇ 50% of the mixed fuel composition of sludge coal, and the water of sludge coal blended fuel is made. Rate ⁇ 50%.
  • the sludge is dewatered by the sludge dewatering equipment 1 to reduce the moisture content of the sludge to ⁇ 85%, and the dewatering equipment 1 can adopt a centrifugal dewatering machine, a filter press, etc., and the dewatered sludge is transported by the sludge conveying equipment.
  • 2 is transported to the sludge storage tank 3 for storage.
  • the sludge storage tank 3 is connected to two sludge transporting devices 2, one of which is used to transport sludge to the sludge storage tank 3, and the other is used to transport sludge.
  • the sludge in the storage tank 3 is sent to the mixer 4, and the sludge conveying device 2 can be a screw conveyor, a screw pump or a plunger pump.
  • the boiler fuel coal is sieved by a screening device 5, and the coal having a particle size of ⁇ 3 mm is sieved out and transported by the coal conveying device 6 to the coal powder storage tank 7 for storage.
  • the pulverized coal bin 7 is coupled with two coal conveying devices 6, one of which is used to transport the sieved coal to the pulverized coal bin 7, and the other is used to transport the coal in the pulverized coal bin 7 to the mixer 4;
  • the screening device 5 can be a vibrating screen or a trommel screen.
  • the coal conveying device 6 can be a belt conveyor, a wind conveyor, or a screw conveyor.
  • the sludge and coal are sent to the mixer 4 according to the determined ratio and amount, and are stirred and mixed to form a sludge coal mixed fuel.
  • the prepared sludge coal mixed fuel is discharged to the receiving silo 8 located under the mixer 4; the feed port of the mixed fuel conveying device 9 is connected with the receiving silo 8, and the discharge port of the mixed fuel conveying device 9 is transported by the mixed fuel
  • the pipe 11 is connected to the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13; the receiving silo 8 is a well-known device (such as the product of Putzmdster PAT, Putzmeister, Germany).
  • a three-way switching valve 10 is installed at each end of the mixed fuel delivery pipe 11 between the mixed fuel delivery device 9 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13, and is adjacent to the mixed fuel delivery pipe 11
  • the intermediate outlet of the three-way conversion wide 10 installed at one end of the mixed fuel delivery device 9 is coupled to the cleaning pipe 15; the 12-end installation of the sludge coal mixed fuel supply port of the mixed fuel delivery pipe 11 near the dual fuel circulating fluidized bed boiler 13
  • the intermediate outlet of the three-way switching valve 10 is coupled to the return conduit 17.
  • the hybrid fuel delivery device 9 can employ a plunger pump or a screw pump.
  • the amount of sludge coal blended fuel added is 20-30% of the total fuel coal consumption of the boiler.
  • 2 to 4 holes with a diameter of 56-160 mm are symmetrically opened on the front and rear or the left and right membrane walls.
  • ⁇ 4 sludge coal mixed fuel supply ports 12 the circulating fluidized bed coal-fired boiler is transformed into a dual fuel circulating fluidized bed boiler 13 using fuel coal and sludge coal mixed fuel.
  • the sludge coal mixed fuel supply port is made of high temperature resistant stainless steel pipe with a diameter of 50 ⁇ 150mm and a length of 500mm.
  • the end of the welded steel pipe is welded with an orifice plate. The end is installed in the opening of the membrane wall and extends into the hole.
  • the circulating fluidized bed boiler combustion chamber but the end does not protrude out of the membrane wall, and is welded to the membrane wall and welded inside and outside the membrane wall.
  • steel The orifice plate welded at the pipe port is stamped by a high-temperature resistant stainless steel plate with a wall thickness of 10 mm.
  • the orifice plate is covered with a circular hole with a hole diameter of C 10-20 mm and a plum blossom type of 60°, which is a mesh-shaped steel plate;
  • the other end of the outer side of the thermal insulation layer of the circulating fluidized bed coal-fired boiler is flanged and connected with the three-way switching valve 10.
  • the boiler fuel coal is the main fuel of the dual fuel circulating fluidized bed boiler 13
  • the sludge coal mixed fuel is the auxiliary fuel of the dual fuel circulating fluidized bed boiler 13 .
  • the boiler fuel coal is sent to the combustion chamber dense phase zone 20 of the dual fuel circulating fluidized bed boiler 13 by the screw conveyor 22, and the sludge coal mixed fuel is fluidized by the mixed fuel delivery device 9, the mixed fuel delivery pipe 11, and the dual fuel circulation.
  • the sludge coal mixed fuel supply port 12 of the bed boiler 13 is sent to the dual fuel circulating fluidized bed boiler 13 for combustion.
  • the sludge coal mixed fuel enters the combustion chamber of the dual fuel circulating fluidized bed boiler 13 through the sludge coal mixed fuel supply port 12 to form agglomerate, and the temperature of the combustion chamber is 850-950'C, and enters the dual fuel circulation fluidization.
  • the moisture on the agglomerated surface in the combustion chamber of the bed boiler 13 is rapidly volatilized, and at the same time, the agglomerated surface begins to burn; during the process of agglomeration combustion, the moisture inside the agglomerate is rapidly expanded by heat, causing the agglomeration to burst into small agglomerates; After being burned by the heat, the mass burst into a smaller agglomerate.
  • the agglomeration of the sludge coal mixed fuel in the lean phase region of the combustion chamber of the dual fuel circulating fluidized bed boiler 13 belongs to a large-sized, low-density particle, and the bed material in the dense phase region of the combustion chamber belongs to a small-sized, high-density particle.
  • the apparent density of the dense phase region of the combustion chamber is much larger than the apparent density of the dilute phase region of the combustion chamber, so that the agglomeration of the coking combustion cannot fall into the dense phase region of the combustion chamber, but "floats" in the dense phase region of the combustion chamber.
  • the mixed fuel delivery pipe 11 When the mixed fuel delivery pipe 11 is idle, the mixed fuel delivery pipe 11 must be cleaned using compressed air. At the time of cleaning, the mixed fuel delivery pipe 9 and the mixed fuel delivery pipe 9 connected to the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 are first placed, and the tee installed near the side of the mixed fuel delivery device 9 is cleaned.
  • the conversion 10 valve is adjusted to the cleaning pipe 16 and the mixed fuel delivery pipe 11 is connected, the mixed fuel delivery device 9 is disconnected from the mixed fuel delivery pipe; the three-way switching valve 10 installed on the cleaning pipe 16 is adjusted to the cleaning pipe 16 and The gas supply pipe of the gas storage tank 15 is turned on; the start air compressor 14 is inflated into the gas storage tank 15, and the compressed air in the gas storage tank 15 enters the mixing through the gas supply pipe, the three-way switching valve 10, and the cleaning pipe 16 In the fuel delivery pipe 9, the sludge coal mixed fuel in the mixed fuel delivery pipe 9 is purged into the dual fuel by the action of the compressed air.
  • the circulating fluidized bed boiler 13 is inside.
  • the three-way switching valve 10 installed in the mixed fuel delivery pipe 11 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 is adjusted to the mixed fuel delivery pipe 11
  • the three-way switching valve 10 installed on the cleaning pipe 16 is adjusted to be connected to the high-pressure water pump 19, and the high-pressure water pump 19 is started to pass water through the three-way switching valve 10 and the cleaning pipe 16 into the mixed fuel.
  • the sludge coal mixed fuel residue in the mixed fuel delivery pipe 11 is flushed into the settling tank 18 by the three-way switching valve 10 and the return pipe 17 through the mixed fuel delivery pipe 11 by the high-pressure water flow.
  • a papermaking company produces 60 tons of sludge with 98% water content and 10 tons of sedimentation tank waste with water content of 80% per day.
  • the company has a circulating fluidization of 75 tons/h.
  • sludge and sedimentation tank waste are added to pulverized coal to form a sludge coal mixed fuel, which is used as an auxiliary fuel for a dual fuel circulating fluidized bed boiler 13 which is converted from a circulating fluidized bed coal-fired boiler.
  • the ratio of sludge to coal is as follows: sludge and sedimentation tank waste account for 50% of the sludge coal blend fuel composition, coal accounts for 50% of the sludge coal blend fuel composition, and the resulting sludge coal blended fuel Water content ⁇ 50%.
  • the sludge is dewatered by the sludge dewatering equipment 1 to reduce the moisture content of the sludge to 85%, and the dewatering equipment 1 uses a centrifugal dewatering machine to transport the dewatered sludge from the sludge conveying equipment 2 to the sludge storage tank.
  • the sludge storage tank 3 is connected with two sludge transporting equipments 2, one of which is used to transport sludge to the sludge storage tank 3, and the other is used to transport the sludge in the sludge storage tank 3. It is sent to the mixer 4, and the sludge delivery device 2 uses a screw pump.
  • the boiler fuel coal is sieved by a screening device 5, and the coal having a particle size of ⁇ 3 mm is sieved out and transported by the coal conveying device 6 to the coal powder storage tank 7 for storage.
  • the pulverized coal bin 7 is connected with two coal conveying devices 6, one of which uses a belt conveyor to transport the sieved coal to the pulverized coal bin 7, and the other uses a screw conveyor for pulverized coal.
  • the coal in the tank 7 is sent to the mixer 4; the screening device 5 uses a vibrating screen.
  • the sludge and the coal are sent to the mixer 4 according to the determined ratio and amount, and are stirred and mixed to form a sludge coal mixed fuel.
  • the prepared sludge coal mixed fuel is discharged to the receiving silo 8 located under the mixer 4; the feed port of the mixed fuel conveying device 9 is connected with the receiving silo 8, and the discharge port of the mixed fuel conveying device 9 is transported by the mixed fuel Tube
  • the channel 11 is coupled to the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13; the receiving silo 8 is a well-known device (e.g., product of Putzmeister PAT, Putzmeister, Germany).
  • a three-way switching valve 10 is installed at each end of the mixed fuel delivery pipe 11 between the mixed fuel delivery device (9) and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13, in the mixed fuel delivery pipe 11 is connected to the cleaning pipe 15 at the intermediate outlet of the three-way switching valve 10 installed near one end of the mixed fuel conveying device 9; near the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 in the mixed fuel delivery pipe 11 -
  • the intermediate outlet of the end-mounted three-way conversion width 10 is coupled to the return conduit 17.
  • the hybrid fuel delivery device 9 employs a plunger pump.
  • the amount of sludge coal blended fuel added is 30% of the total fuel coal consumption of the boiler.
  • the coal mixed fuel supply port 12 converts the circulating fluidized bed coal fired boiler into a dual fuel circulating fluidized bed boiler 13 using a fuel coal and sludge coal mixed fuel.
  • the sludge coal mixed fuel supply port is made of a stainless steel pipe with a diameter of 150mm and a length of 500mm. The welded end of the steel pipe is installed in the opening of the membrane wall and extends into the combustion chamber of the circulating fluidized bed boiler.
  • the orifice plate welded at the end of the steel pipe is stamped by a high-temperature resistant stainless steel plate with a wall thickness of 10 mm.
  • the orifice plate is covered with a circular hole with a hole diameter of ⁇ 220 mm and a plum blossom type of 60°; the steel pipe of the sludge coal mixed fuel supply pipe is extended and fluidized.
  • the other end of the outer layer of the coal-fired boiler insulation layer is flanged and connected to the three-way conversion width 10.
  • the boiler fuel coal is the main fuel of the dual fuel circulating fluidized bed boiler 13
  • the sludge coal mixed fuel is the auxiliary fuel of the dual fuel circulating fluidized bed boiler 13.
  • the sludge coal mixed fuel is added in an amount of 5-50% of the fuel coal addition amount of the dual fuel circulating fluidized bed boiler 13; the boiler fuel coal is sent to the dense phase region of the combustion chamber of the dual fuel circulating fluidized bed boiler 13 through the screw conveyor 22.
  • sludge coal mixed fuel is fed into the dual fuel circulating fluidized bed boiler by the mixed fuel delivery device 9, the mixed fuel delivery pipe 11 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 .
  • the sludge coal mixed fuel enters the combustion chamber through the sludge coal mixed fuel supply port 12 to form agglomerate, the temperature of the combustion chamber is 850-950'C, and the moisture entering the agglomerated surface in the combustion chamber is rapidly evaporated, and at the same time, The surface of the mass begins to burn; during the process of agglomeration combustion, the water inside the agglomerates expands rapidly due to heat, causing the agglomeration to burst into small agglomerates; after the small agglomerates are heated and burned, they burst into smaller agglomerates.
  • the agglomeration of the sludge coal mixed fuel in the lean phase region of the combustion chamber of the dual fuel circulating fluidized bed boiler 13 belongs to a large-sized, low-density particle, and the bed material in the dense phase region of the combustion chamber belongs to a small-sized, high-density particle.
  • the apparent density of the dense phase region of the combustion chamber is far greater than the apparent density of the dilute phase region of the combustion chamber, so that the agglomeration of coking combustion cannot fall into the dense phase region of the combustion chamber, but "float" in the dense phase region of the combustion chamber.
  • the mixed fuel delivery pipe 11 When the mixed fuel delivery pipe 11 is idle, the mixed fuel delivery pipe 11 must be cleaned with compressed air. The cleaning is first carried out on the mixed fuel delivery pipe 9 to which the mixed fuel delivery device 9 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 are connected, adjacent to the side of the mixed fuel delivery device 9.
  • the three-way conversion 10 valve is adjusted to be connected to the cleaning pipe 16 and the mixed fuel delivery pipe, disconnecting the mixed fuel delivery device 9 from the mixed fuel delivery pipe; adjusting the three-way switching valve 10 installed on the cleaning pipe 16 to the cleaning pipe 16 is connected to the gas transmission pipe of the gas storage tank 15; the startup air compressor 14 is inflated into the gas storage tank 15, and the compressed air in the gas storage tank 15 enters through the gas supply pipe, the three-way switching valve 10, and the cleaning pipe 16 In the mixed fuel delivery pipe 9, the sludge coal mixed fuel in the mixed fuel delivery pipe 9 is purged into the dual fuel circulating fluidized bed boiler 13 by the action of compressed air.
  • the three-way switching valve 10 installed in the mixed fuel delivery pipe 11 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 is adjusted to a mixed fuel delivery pipe.
  • 11 is connected to the return pipe 17, and the three-way switching valve 10 installed on the cleaning pipe 16 is adjusted to be connected to the high-pressure water pump 19, and the high-pressure water pump 19 is started to pass the water through the three-way switching valve 10 and the cleaning pipe 16 to mix.
  • the sludge coal mixed fuel residue in the mixed fuel delivery pipe 11 is flushed into the settling tank 18 by the three-way switching valve 10 and the return pipe 17 through the mixed fuel delivery pipe 11 by the high-pressure water flow.
  • Table 1 compares the combustion of sludge and coal blend fuel in a single boiler before and after:
  • Taiwan consumes more than 1,400 tons of fuel coal per day, using the invention to add sludge and sedimentation tank waste into pulverized coal to form sludge coal mixed fuel, and convert the circulating fluidized bed coal-fired boiler into a dual fuel circulating fluidized bed combustion Coal boilers, sludge-cement blended fuels are used as auxiliary fuels for dual-fuel circulating fluidized bed coal-fired boilers.
  • the ratio of sludge to coal is by weight: sludge accounts for 65% of the sludge coal blend fuel composition, and coal accounts for 35% of the sludge coal blend fuel component.
  • the prepared sludge coal blended fuel has a water content of ⁇ 50%.
  • the sludge is dewatered by the sludge dewatering equipment 1 to reduce the moisture content of the sludge to ⁇ 80%, and the dewatering equipment 1 uses a filter press to transport the dewatered sludge from the sludge transportation equipment 2 to the sludge storage tank.
  • the sludge storage tank 3 is connected with two sludge transporting equipments 2, one of which is used to transport sludge to the sludge storage tank 3, and the other is used to transport the sludge in the sludge storage tank 3. It is sent to the mixer 4, and the sludge delivery device 2 uses a plunger pump.
  • the boiler fuel coal is sieved by a screening device 5, and the coal having a particle size of ⁇ 3 mm is sieved out and transported by the coal conveying device 6 to the coal powder storage tank 7 for storage.
  • the pulverized coal bin 7 is connected with two coal conveying devices 6, one of which uses a wind conveyor to transport the sieved coal to the pulverized coal bin 7, and the other uses a screw conveyor for pulverized coal.
  • the coal in the silo 7 is sent to the agitator 4; the screening device 5 is a trommel.
  • the sludge and coal are sent to the mixer 4 according to the determined ratio and amount, and are stirred and mixed to form a sludge coal mixed fuel.
  • the prepared sludge coal mixed fuel is discharged to the receiving silo 8 located under the mixer 4; the feed port of the mixed fuel conveying device 9 is connected with the receiving silo 8, and the discharge port of the mixed fuel conveying device 9 is transported by the mixed fuel
  • the pipe 11 is connected to the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13; the receiving silo 8 is a well-known device (such as the product of Putzmeister PAT, Putzmeister, Germany).
  • a three-way switching valve 10 is installed at each end of the mixed fuel delivery pipe (11) between the mixed fuel delivery device 9 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 in the mixed fuel delivery pipe 11 is connected to the cleaning pipe 15 at the intermediate outlet of the three-way switching valve 10 installed near one end of the mixed fuel conveying device 9; near the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 in the mixed fuel delivery pipe 11 -
  • the intermediate outlet of the end-mounted three-way switching valve 10 is coupled to the return conduit 17.
  • the hybrid fuel delivery device 9 can employ a plunger pump or a screw pump.
  • the amount of sludge coal blended fuel added is 20% of the total fuel coal consumption of the boiler.
  • the hole plate welded at the end of the steel pipe is stamped by a high-temperature resistant stainless steel plate with a wall thickness of 10 mm.
  • the orifice plate is covered with a circular hole with a hole diameter of C 10 mm and a plum blossom type of 60°; the sludge coal mixed fuel supply pipe is extended and fluidized.
  • the other end of the outer layer of the bed coal-fired boiler is installed with a flange and is connected with the three-way switching valve 10.
  • the boiler fuel coal is the main fuel of the dual fuel circulating fluidized bed boiler 13
  • the sludge coal mixed fuel is the auxiliary fuel of the dual fuel circulating fluidized bed boiler 13 .
  • the sludge coal mixed fuel is added in an amount of 5-50% of the fuel coal addition amount of the dual fuel circulating fluidized bed boiler 13; the boiler fuel coal is sent to the dense phase region of the combustion chamber of the dual fuel circulating fluidized bed boiler 13 through the screw conveyor 22.
  • sludge coal mixed fuel is fed into the dual fuel circulating fluidized bed boiler by the mixed fuel delivery device 9, the mixed fuel delivery pipe 11 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 .
  • the sludge coal mixed fuel enters the combustion chamber through the sludge coal mixed fuel supply port 12 to form agglomerate, the temperature of the combustion chamber is 850-950'C, and the moisture entering the agglomerated surface in the combustion chamber is rapidly evaporated, and at the same time, The surface of the mass begins to burn; during the process of agglomeration combustion, the water inside the agglomerates expands rapidly due to heat, causing the agglomeration to burst into small agglomerates; after the small agglomerates are heated and burned, they burst into smaller agglomerates.
  • the agglomeration of the sludge coal mixed fuel in the lean phase region of the combustion chamber of the dual fuel circulating fluidized bed boiler 13 belongs to a large-sized, low-density particle, and the bed material in the dense phase region of the combustion chamber belongs to a small-sized, high-density particle.
  • the apparent density of the dense phase region of the combustion chamber is far greater than the apparent density of the dilute phase region of the combustion chamber, so that the agglomeration of coking combustion cannot fall into the dense phase region of the combustion chamber, but "float" in the dense phase region of the combustion chamber.
  • the mixed fuel delivery pipe 11 When the mixed fuel delivery pipe 11 is idle, the mixed fuel delivery pipe 11 must be cleaned using compressed air. At the time of cleaning, the mixed fuel delivery pipe 9 and the mixed fuel delivery pipe 9 connected to the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 are first placed, and the tee installed near the side of the mixed fuel delivery device 9 is cleaned.
  • the conversion 10 valve is adjusted to the cleaning pipe 16 and the mixed fuel delivery pipe 11 is connected, the mixed fuel delivery device 9 is disconnected from the mixed fuel delivery pipe; the three-way switching valve 10 installed on the cleaning pipe 16 is adjusted to the cleaning pipe 16 and The gas supply pipe of the gas storage tank 15 is turned on; the start air compressor 14 is inflated into the gas storage tank 15, and the compressed air in the gas storage tank 15 enters the mixed fuel through the gas supply pipe, the three-way switching valve 10, and the cleaning pipe 16 In the delivery pipe 9, the sludge coal mixed fuel in the mixed fuel delivery pipe 9 is purged into the dual fuel circulating fluidized bed boiler 13 by the action of compressed air.
  • the three-way switching valve 10 installed in the mixed fuel delivery pipe 11 and the sludge coal mixed fuel supply port 12 of the dual fuel circulating fluidized bed boiler 13 is adjusted to the mixed fuel delivery pipe 11
  • the three-way switching valve 10 installed on the cleaning pipe 16 is adjusted to be connected to the high-pressure water pump 19, and the high-pressure water pump 19 is started to pass water through the three-way switching valve 10 and the cleaning pipe 16 into the mixed fuel.
  • the sludge coal mixed fuel residue in the mixed fuel delivery pipe 11 is flushed into the settling tank 18 by the three-way switching valve 10 and the return pipe 17 through the mixed fuel delivery pipe 11 by the high-pressure water flow.
  • Table 2 compares the combustion of sludge and coal blend fuel in a single boiler before and after:

Abstract

L'invention concerne un combustible mixte à base de boues et de charbon. Les matières premières des boues proviennent d'eaux résiduaires industrielles ou urbaines d'installations de traitement d'eaux résiduaires et du nettoyage de canalisations d'évacuation urbaines, de rivières, de lacs et de canaux. Selon l'invention, le rapport pondéral entre les boues et le charbon est de 50 à 65% pour les boues et 35 à 50% pour le charbon. Le combustible mixte à base de boues et de charbon, le charbon servant de combustible dans une chaudière, sert à alimenter la chaudière lorsqu'il est utilisé. Le pourcentage du combustible mixte à base de boues et de charbon par rapport au charbon utilisé pour la chaudière est de 20 à 30%.
PCT/CN2007/002899 2006-11-22 2007-10-09 Combustible mixte à base de boues et de charbon et procédé d'utilisation associé WO2008061430A1 (fr)

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CN2006101147189A CN101191089B (zh) 2006-11-22 2006-11-22 一种污泥煤混合燃料及使用方法
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CN117329535A (zh) * 2023-09-28 2024-01-02 无锡惠联热电有限公司 四角切圆高温高压煤粉锅炉掺污低氮燃烧系统

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CN106118792A (zh) * 2016-06-28 2016-11-16 卓宇轩 一种污泥合成燃料及其制造方法
CN112574794A (zh) * 2020-11-17 2021-03-30 珠海红塔仁恒包装股份有限公司 一种造纸污泥的处理方法

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