CN114195347A - Sludge pyrolysis carbonization process - Google Patents

Sludge pyrolysis carbonization process Download PDF

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Publication number
CN114195347A
CN114195347A CN202111584697.8A CN202111584697A CN114195347A CN 114195347 A CN114195347 A CN 114195347A CN 202111584697 A CN202111584697 A CN 202111584697A CN 114195347 A CN114195347 A CN 114195347A
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sludge
flue gas
carbonization
pyrolysis
conveying
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CN202111584697.8A
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Inventor
谭蕾
汪国梁
杨坦坦
汪文逸
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Qingdao Yimeisheng Investment Co ltd
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Qingdao Lanbo Environmental Technology Co ltd
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Priority to CN202111584697.8A priority Critical patent/CN114195347A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/10Treatment of sludge; Devices therefor by pyrolysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B49/00Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
    • C10B49/02Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/40Valorisation of by-products of wastewater, sewage or sludge processing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention relates to the technical field of sludge carbonization, in particular to a sludge pyrolysis carbonization process, which comprises sludge receiving and storing, mechanical deep dehydration, thermal scattering and drying, pyrolysis carbonization, sludge carbon cooling and storage and tail gas purification treatment, wherein high-moisture (55-99%) wet sludge is subjected to processes of mechanical deep dehydration, thermal drying, pyrolysis carbonization and the like to prepare sludge peat.

Description

Sludge pyrolysis carbonization process
Technical Field
The invention relates to the technical field of sludge carbonization, in particular to a sludge pyrolysis carbonization process.
Background
In order to reduce the cost of sludge treatment, simultaneously realize thorough sludge reduction, prevent dioxin from being generated in the process, solidify heavy metals in the sludge, reserve nutrient elements such as nitrogen, phosphorus and potassium in the sludge, and safely use the product sludge coal as a building material raw material, landscaping nutrient soil or fuel, thereby finding a new way for resource utilization of the sludge, and therefore, the sludge pyrolysis carbonization process is provided.
Disclosure of Invention
The invention aims to provide a sludge pyrolysis carbonization process to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a sludge pyrolysis carbonization process comprises sludge receiving and storage, mechanical deep dehydration, thermal scattering and drying, pyrolysis carbonization, sludge charcoal cooling storage and transportation and tail gas purification treatment, and comprises the following steps:
s1, weighing the sludge with the water content of 55-65%, and sending the sludge into a dewatered sludge bin for further treatment; weighing wet sludge with the water content of 75-85%, conveying the wet sludge into a wet sludge transfer bin, conveying the wet sludge into a sludge conditioning machine through a sludge pump and a pipeline at the bottom, adding a conditioning agent, fully conditioning, conveying the wet sludge into a mechanical dehydrator, reducing the water content of the sludge to 55-65%, and conveying the sludge into a dehydrated sludge bin; wet sludge with the water content of 97-99% passes through a sludge pump, a pipeline and a flowmeter and is directly conveyed to sludge concentration equipment, enters a sludge conditioning and mechanical dehydration device and is reduced to 55-65%, and then is conveyed to a dehydrated sludge bin;
s2, conveying dewatered sludge with the water content of 55-65% into a sludge dryer by a conveyor, and fully scattering, crushing and throwing the sludge by a shoveling plate and a scattering mechanism arranged in the dryer to fully contact with high-temperature flue gas entering in a concurrent or countercurrent manner; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeding device of a sludge carbonization furnace, and feeding evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
s3, the sludge carbonization furnace feeder feeds the dried sludge with the moisture content less than 20% into a central barrel of the sludge carbonization furnace, the inner barrel slowly rotates to push the sludge to move forward, and the sludge and the barrel wall conduct and radiate heat exchange to generate sludge coal which is discharged from the end of the carbonization furnace and is fed into a carbonization material bin after being cooled by a cooler; the sludge contains a large amount of organic matters, and combustible pyrolysis gas with high calorific value is released in the pyrolysis process, is sent into a pyrolysis gas combustion tower and then is combusted to generate high-temperature flue gas, and the high-temperature flue gas is supplied to a carbonization furnace for carbonization;
adjusting the temperature of high-temperature flue gas generated by the pyrolysis gas combustion tower to 600-900 ℃, and feeding the high-temperature flue gas into a plurality of high-temperature flue gas inlets at the bottom of the carbonization furnace; the method comprises the following steps of (1) reducing the temperature of flue gas to 450-500 ℃, discharging the flue gas from the tail end of a cylinder, feeding the flue gas into a sludge dryer, contacting with sludge for heat exchange, reducing the temperature of the flue gas after heat exchange to 100-130 ℃, discharging the flue gas from the outlet of the dryer, dedusting the flue gas by a cyclone dust collector and a bag-type dust collector, removing pollution factors by a denitration tower, a desulfurization tower, a dust collector and an active carbon adsorption device in sequence, finally feeding the flue gas into a de-whitening device, deeply removing water in the flue gas, and discharging the flue gas after reaching the standard;
and S4, conveying the cooled sludge carbon to a sludge carbon storage bin through a conveying device, and packaging the sludge carbon by a packaging machine and then transporting the sludge carbon outside.
According to the preferable scheme of the invention, wet sludge with the water content of 97-99% of S1 is directly conveyed to sludge concentration equipment through a sludge pump, a pipeline and a flowmeter, and is concentrated to about 95% after a flocculating agent is added.
As a preferable scheme of the invention, S2 fully breaks up, crushes and throws the sludge, the sludge is fully contacted with high-temperature flue gas entering in a concurrent or countercurrent manner, heat transfer modes of conduction, convection and radiation are comprehensively utilized to improve heat exchange efficiency, the moisture content of the sludge is rapidly reduced from 55-65% to below 20%, and the dried sludge is discharged from the tail end of the dryer.
As a preferable scheme of the invention, S3 indirectly heats the dried sludge with the moisture content of less than 20% to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis and carbonization, and the sludge carbon is cooled to 25-45 ℃ by a cooler and then is sent to a carbonization material bin.
As a preferable scheme of the invention, the flue gas after the heat exchange of S3 sequentially passes through a denitration tower to remove nitrogen oxides, a desulfurization tower to remove acidic gases such as sulfur dioxide and the like, a dust remover to remove dust in the flue gas, and then the flue gas is sent into an activated carbon adsorption device through a draught fan to remove dust in the flue gas and a very small amount of dioxin and heavy metals which may exist.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the high-moisture (55-99%) wet sludge is subjected to processes of mechanical deep dehydration, thermal drying, pyrolysis carbonization and the like to prepare the sludge peat, the process adopts pyrolysis gas combustion energy supply and thermal energy circulation, the cost of sludge treatment can be reduced, meanwhile, the sludge is thoroughly reduced, dioxin is not generated in the process, heavy metals in the sludge are solidified, nutrient elements such as nitrogen, phosphorus and potassium in the sludge are reserved, the product sludge peat can be safely used as building material raw materials, landscaping nutrient soil or fuel, a new way is found for resource utilization of the sludge, and important social benefits and environmental benefits are achieved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in order to facilitate an understanding of the invention, but the invention may be embodied in many different forms and is not limited to the embodiments described herein; rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention provides a technical scheme that:
a sludge pyrolysis carbonization process comprises sludge receiving and storage, mechanical deep dehydration, thermal scattering and drying, pyrolysis carbonization, sludge charcoal cooling storage and transportation and tail gas purification treatment, and comprises the following steps:
s1, weighing the sludge with the water content of 55-65%, and sending the sludge into a dewatered sludge bin for further treatment; weighing wet sludge with the water content of 75-85%, conveying the wet sludge into a wet sludge transfer bin, conveying the wet sludge into a sludge conditioning machine through a sludge pump and a pipeline at the bottom, adding a conditioning agent, fully conditioning, conveying the wet sludge into a mechanical dehydrator, reducing the water content of the sludge to 55-65%, and conveying the sludge into a dehydrated sludge bin; wet sludge with the water content of 97-99% passes through a sludge pump, a pipeline and a flowmeter and is directly conveyed to sludge concentration equipment, enters a sludge conditioning and mechanical dehydration device and is reduced to 55-65%, and then is conveyed to a dehydrated sludge bin;
s2, conveying dewatered sludge with the water content of 55-65% into a sludge dryer by a conveyor, and fully scattering, crushing and throwing the sludge by a shoveling plate and a scattering mechanism arranged in the dryer to fully contact with high-temperature flue gas entering in a concurrent or countercurrent manner; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeding device of a sludge carbonization furnace, and feeding evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
s3, the sludge carbonization furnace feeder feeds the dried sludge with the moisture content less than 20% into a central barrel of the sludge carbonization furnace, the inner barrel slowly rotates to push the sludge to move forward, and the sludge and the barrel wall conduct and radiate heat exchange to generate sludge coal which is discharged from the end of the carbonization furnace and is fed into a carbonization material bin after being cooled by a cooler; the sludge contains a large amount of organic matters, and combustible pyrolysis gas with high calorific value is released in the pyrolysis process, is sent into a pyrolysis gas combustion tower and then is combusted to generate high-temperature flue gas, and the high-temperature flue gas is supplied to a carbonization furnace for carbonization;
adjusting the temperature of high-temperature flue gas generated by the pyrolysis gas combustion tower to 600-900 ℃, and feeding the high-temperature flue gas into a plurality of high-temperature flue gas inlets at the bottom of the carbonization furnace; the method comprises the following steps of (1) reducing the temperature of flue gas to 450-500 ℃, discharging the flue gas from the tail end of a cylinder, feeding the flue gas into a sludge dryer, contacting with sludge for heat exchange, reducing the temperature of the flue gas after heat exchange to 100-130 ℃, discharging the flue gas from the outlet of the dryer, dedusting the flue gas by a cyclone dust collector and a bag-type dust collector, removing pollution factors by a denitration tower, a desulfurization tower, a dust collector and an active carbon adsorption device in sequence, finally feeding the flue gas into a de-whitening device, deeply removing water in the flue gas, and discharging the flue gas after reaching the standard;
and S4, conveying the cooled sludge carbon to a sludge carbon storage bin through a conveying device, and packaging the sludge carbon by a packaging machine and then transporting the sludge carbon outside.
And (3) directly conveying wet sludge with the water content of 97-99% of S1 to sludge concentration equipment through a sludge pump, a pipeline and a flowmeter, adding a flocculating agent, and concentrating to about 95%.
S2 the sludge is fully scattered, crushed and thrown up and fully contacted with high-temperature flue gas entering in a concurrent or countercurrent mode, heat transfer modes of conduction, convection and radiation are comprehensively utilized to improve heat exchange efficiency, the water content of the sludge is rapidly reduced from 55-65% to below 20%, and the dried sludge is discharged from the tail end of a dryer.
S3, indirectly heating the dried sludge with the moisture content less than 20% to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis and carbonization, cooling sludge carbon to 25-45 ℃ by a cooling machine, and feeding the cooled sludge carbon into a carbonization material bin.
The flue gas after the heat exchange of S3 is sequentially subjected to a denitration tower to remove nitrogen oxides, a desulfurization tower to remove acid gases such as sulfur dioxide and the like, a dust remover to remove dust in the flue gas, and an induced draft fan to send the flue gas into an activated carbon adsorption device to remove dust in the flue gas and a very small amount of dioxin and heavy metals which may exist.
Example (b): the method comprises the steps of sludge receiving and storing, mechanical deep dehydration, thermal scattering and drying, pyrolysis and carbonization, sludge charcoal cooling, storage and transportation and tail gas purification treatment, wherein the sludge with the water content of 55-65% is weighed and then sent into a dehydrated sludge bin for the next treatment; weighing wet sludge with the water content of 75-85%, conveying the wet sludge into a wet sludge transfer bin, conveying the wet sludge into a sludge conditioning machine through a sludge pump and a pipeline at the bottom, adding a conditioning agent, fully conditioning, conveying the wet sludge into a mechanical dehydrator, reducing the water content of the sludge to 55-65%, and conveying the sludge into a dehydrated sludge bin; wet sludge with the water content of 97-99% passes through a sludge pump, a pipeline and a flowmeter and is directly conveyed to sludge concentration equipment, a flocculating agent is added to the sludge and is concentrated to about 95%, the sludge enters a sludge conditioning and mechanical dehydration device and is reduced to 55-65%, and then the sludge is conveyed to a dehydrated sludge bin;
conveying dewatered sludge with the water content of 55-65% into a sludge dryer by a conveyor, fully scattering, crushing and throwing the sludge by a material shoveling plate and a scattering mechanism arranged in the dryer, fully contacting the sludge with high-temperature flue gas entering in a concurrent or countercurrent manner, comprehensively utilizing heat transfer modes of conduction, convection and radiation to improve the heat exchange efficiency, rapidly reducing the water content of the sludge from 55-65% to below 20%, and discharging the dried sludge from the tail end of the dryer; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeding device of a sludge carbonization furnace, and feeding evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
the method comprises the following steps that sludge with the moisture content of less than 20% after drying is sent into a central barrel of the sludge carbonization furnace by a sludge carbonization furnace feeder, an inner barrel slowly rotates to push the sludge to move forwards and conduct and radiate heat exchange with the barrel wall, the sludge is indirectly heated to 300-700 ℃ in an anaerobic/anoxic state to be pyrolyzed and carbonized, the produced sludge coal is discharged from the tail end of the carbonization furnace, and the sludge carbon is cooled to 25-45 ℃ by a cooler and sent into a carbonization material bin; the sludge contains a large amount of organic matters, combustible pyrolysis gas with high calorific value is released in the pyrolysis process, the combustible pyrolysis gas is sent into a pyrolysis gas combustion tower and then combusted to generate high-temperature flue gas which is used for supplying heat required by carbonization of a carbonization furnace, and when the heat energy provided by the pyrolysis gas is low, natural gas is directly supplemented to combust to supplement the heat;
adjusting the temperature of high-temperature flue gas generated by the pyrolysis gas combustion tower to 600-900 ℃, and feeding the high-temperature flue gas into a plurality of high-temperature flue gas inlets at the bottom of the carbonization furnace to provide heat energy required by sludge carbonization; the method comprises the following steps of reducing the temperature of flue gas to 450-500 ℃, discharging the flue gas from the tail end of a cylinder, sending the flue gas into a sludge dryer, contacting with sludge for heat exchange, reducing the temperature of the flue gas after heat exchange to 100-130 ℃, discharging the flue gas from the outlet of the dryer, dedusting the flue gas by a cyclone dust collector and a bag-type dust collector, removing nitrogen oxides by a denitration tower, removing sulfur dioxide and other acidic gases by a desulfurization tower, removing dust in the flue gas by a dust collector, sending the flue gas into an active carbon adsorption device by an induced draft fan, removing dust in the flue gas and a possible very small amount of dioxin and heavy metals, finally sending the flue gas into a de-whitening device, and discharging the flue gas after deeply removing moisture in the flue gas to reach the standard;
conveying the cooled sludge carbon to a sludge carbon storage bin through a conveying device, and packaging the sludge carbon by a packaging machine and then transporting the sludge carbon outside;
the process adopts pyrolysis gas combustion energy supply and thermal energy circulation, can reduce the cost of sludge treatment, simultaneously realizes thorough sludge reduction, does not generate dioxin in the process, solidifies heavy metals in the sludge, retains nutrient elements such as nitrogen, phosphorus and potassium in the sludge, and the product sludge peat can be safely used as building material raw materials, landscaping nutrient soil or fuel, finds a new way for resource utilization of the sludge, and has important social benefits and environmental benefits.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (5)

1. A sludge pyrolysis carbonization process comprises sludge receiving and storage, mechanical deep dehydration, thermal scattering and drying, pyrolysis carbonization, sludge charcoal cooling storage and transportation and tail gas purification treatment, and is characterized by comprising the following steps:
s1, weighing the sludge with the water content of 55-65%, and sending the sludge into a dewatered sludge bin for further treatment; weighing wet sludge with the water content of 75-85%, conveying the wet sludge into a wet sludge transfer bin, conveying the wet sludge into a sludge conditioning machine through a sludge pump and a pipeline at the bottom, adding a conditioning agent, fully conditioning, conveying the wet sludge into a mechanical dehydrator, reducing the water content of the sludge to 55-65%, and conveying the sludge into a dehydrated sludge bin; wet sludge with the water content of 97-99% passes through a sludge pump, a pipeline and a flowmeter and is directly conveyed to sludge concentration equipment, enters a sludge conditioning and mechanical dehydration device and is reduced to 55-65%, and then is conveyed to a dehydrated sludge bin;
s2, conveying dewatered sludge with the water content of 55-65% into a sludge dryer by a conveyor, and fully scattering, crushing and throwing the sludge by a shoveling plate and a scattering mechanism arranged in the dryer to fully contact with high-temperature flue gas entering in a concurrent or countercurrent manner; collecting dust carried in the flue gas by a cyclone separator and a bag-type dust collector, collecting the dust and dried sludge discharged from the tail end of a dryer, sending the collected dust and the dried sludge into a feeding device of a sludge carbonization furnace, and feeding evaporated moisture into a tail gas treatment facility at the rear end along with hot flue gas;
s3, the sludge carbonization furnace feeder feeds the dried sludge with the moisture content less than 20% into a central barrel of the sludge carbonization furnace, the inner barrel slowly rotates to push the sludge to move forward, and the sludge and the barrel wall conduct and radiate heat exchange to generate sludge coal which is discharged from the end of the carbonization furnace and is fed into a carbonization material bin after being cooled by a cooler; the sludge contains a large amount of organic matters, and combustible pyrolysis gas with high calorific value is released in the pyrolysis process, is sent into a pyrolysis gas combustion tower and then is combusted to generate high-temperature flue gas, and the high-temperature flue gas is supplied to a carbonization furnace for carbonization;
adjusting the temperature of high-temperature flue gas generated by the pyrolysis gas combustion tower to 600-900 ℃, and feeding the high-temperature flue gas into a plurality of high-temperature flue gas inlets at the bottom of the carbonization furnace; the method comprises the following steps of (1) reducing the temperature of flue gas to 450-500 ℃, discharging the flue gas from the tail end of a cylinder, feeding the flue gas into a sludge dryer, contacting with sludge for heat exchange, reducing the temperature of the flue gas after heat exchange to 100-130 ℃, discharging the flue gas from the outlet of the dryer, dedusting the flue gas by a cyclone dust collector and a bag-type dust collector, removing pollution factors by a denitration tower, a desulfurization tower, a dust collector and an active carbon adsorption device in sequence, finally feeding the flue gas into a de-whitening device, deeply removing water in the flue gas, and discharging the flue gas after reaching the standard;
and S4, conveying the cooled sludge carbon to a sludge carbon storage bin through a conveying device, and packaging the sludge carbon by a packaging machine and then transporting the sludge carbon outside.
2. The process of claim 1, wherein the wet sludge with the water content of 97-99% of S1 is directly conveyed to a sludge concentration device through a sludge pump, a pipeline and a flowmeter, and is concentrated to about 95% after a flocculating agent is added.
3. The sludge pyrolysis carbonization process according to claim 1, wherein S2 fully breaks up, crushes and throws the sludge, the sludge is fully contacted with high-temperature flue gas entering in a concurrent or countercurrent manner, heat transfer modes of conduction, convection and radiation are comprehensively utilized to improve heat exchange efficiency, the water content of the sludge is rapidly reduced from 55-65% to below 20%, and the dried sludge is discharged from the tail end of a dryer.
4. The sludge pyrolysis carbonization process according to claim 1, wherein S3 indirectly heats the dried sludge with a moisture content of less than 20% to 300-700 ℃ in an anaerobic/anoxic state for pyrolysis carbonization, and the sludge carbon is cooled to 25-45 ℃ by a cooler and then is sent to a carbonization material bin.
5. The process of claim 1, wherein the flue gas after heat exchange in S3 is sequentially subjected to a denitration tower to remove nitrogen oxides, a desulfurization tower to remove acid gases such as sulfur dioxide and the like, a dust remover to remove dust in the flue gas, and an induced draft fan to send the flue gas into an activated carbon adsorption device to remove dust in the flue gas and a small amount of dioxin and heavy metals which may be present.
CN202111584697.8A 2021-12-23 2021-12-23 Sludge pyrolysis carbonization process Pending CN114195347A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114752423A (en) * 2022-04-06 2022-07-15 浙江大学 Activated sludge biomass fuel and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014101324A1 (en) * 2012-12-27 2014-07-03 Lin Xiumei Sludge magnetic pyrolysis, exhaust gas incineration process, and integrated machine therefor
CN108249720A (en) * 2018-03-13 2018-07-06 山东金孚环境工程有限公司 A kind of method that mechanical dehydration coupling desiccation pyrolysis prepares sludge carbon

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014101324A1 (en) * 2012-12-27 2014-07-03 Lin Xiumei Sludge magnetic pyrolysis, exhaust gas incineration process, and integrated machine therefor
CN108249720A (en) * 2018-03-13 2018-07-06 山东金孚环境工程有限公司 A kind of method that mechanical dehydration coupling desiccation pyrolysis prepares sludge carbon

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114752423A (en) * 2022-04-06 2022-07-15 浙江大学 Activated sludge biomass fuel and preparation method thereof

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