CN110759626A - Sludge conditioning dehydration coupling carbonization reduction treatment method and system - Google Patents
Sludge conditioning dehydration coupling carbonization reduction treatment method and system Download PDFInfo
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- CN110759626A CN110759626A CN201911169609.0A CN201911169609A CN110759626A CN 110759626 A CN110759626 A CN 110759626A CN 201911169609 A CN201911169609 A CN 201911169609A CN 110759626 A CN110759626 A CN 110759626A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2303/10—Energy recovery
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Abstract
The invention discloses a sludge conditioning dehydration coupling carbonization and reduction treatment method, which comprises a flue gas flow, wherein hot flue gas enters a pyrolysis and carbonization system to indirectly heat sludge, heat is absorbed by a carbonization process, the discharged flue gas enters a thermal drying and dehydration system to dry the sludge, tail gas carries a small amount of dust, enters a cyclone dust collector to perform solid-gas separation, enters a deodorization device through a desulfurization and denitrification system and a system induced draft fan to perform deodorization and purification, and then is discharged after reaching the standard; B. a sludge flow path: wet sludge is conveyed to a conditioning tank, is subjected to homogenizing conditioning, is conveyed to a mechanical filter pressing device for filter pressing treatment, is conveyed to a semi-dry sludge bin, enters a sludge thermal drying dehydration system through a sludge buffer hopper, is directly contacted with hot flue gas for heat exchange, and is conveyed to a pyrolysis carbonization system, the sludge is indirectly heated and carbonized by the high-temperature flue gas, organic matters in the sludge are separated out in a volatile matter mode, residual moisture is also evaporated and separated out, the sludge forms sludge carbon in the pyrolysis carbonization system, and the sludge carbon is conveyed to a finished product bin for loading and transporting.
Description
Technical Field
The invention relates to the field of solid waste treatment and resource utilization, in particular to a sludge conditioning dehydration coupling carbonization reduction treatment method and system.
Background
Along with the rapid development of the social economy and urbanization process of China, the scale of urban sewage treatment and industrial wastewater treatment is continuously enlarged, the sludge production is greatly increased, 6000 million tons of sludge (with water content of 80%) are expected to be produced annually in 2020, and the sludge is continuously increased at the same time by 15% acceleration; the sludge has the characteristics of high yield, high water content and high pollution, meanwhile, the sludge contains pathogenic bacteria, antibiotics, heavy metals and other harmful components, and the conventional treatment modes such as aerobic composting, anaerobic methane preparation and the like are difficult to completely treat the harmful substances in the sludge. The combustion technology can realize a method for harmlessly and quantitatively reducing sludge in a short time and eliminate internal harmful substances, such as boiler blending combustion, cement kiln cooperation and incineration treatment, so that the pollutants can be treated, but the technologies generate dioxin which is difficult to treat in the treatment process, and simultaneously, due to low heat value of the sludge, the combustion process needs a large amount of energy consumption, which leads to violent increase of the treatment cost. Therefore, it is urgently required to develop a sludge disposal method and system which can thoroughly treat the harmful components in the sludge without generating new secondary pollution in the treatment process.
Chinese patent application CN 107129124 a discloses a system and method for continuously treating domestic sludge, the system comprising: spiral drying retort and revolving bed pyrolysis oven, spiral drying retort body one end has the domestic sludge entry, and the other end has the carbonized sludge export. A feeding area, a primary drying area, a secondary drying area, carbides and a discharging area are formed in the body along the direction from a domestic sludge inlet to a carbonized sludge outlet, each stage of drying area is respectively provided with a burner and a water vapor outlet, the carbonized area is provided with a combustible gas outlet, and the discharging area is provided with a flue gas outlet; a spiral conveyor of the spiral drying carbonization furnace is arranged in the body along the direction from the domestic sludge inlet to the carbonized sludge outlet; the rotary bed pyrolysis furnace is provided with a carbonized sludge inlet, a pyrolysis oil gas outlet and a solid residue outlet, and a radiant tube is arranged in the rotary bed pyrolysis furnace. The application does not relate to sludge conditioning and mechanical dewatering content, and meanwhile, the drying and carbonization are heated by a burner, so that the energy utilization rate is low.
Chinese patent application CN 109052889 a discloses a carbonization device of indirect heating movable industrial sludge continuous pyrolysis method, the process flow of the method comprises: the method comprises the steps of conveying, water evaporation, medium temperature drying, high temperature carbonization, temperature and pressure adjustment, cooling treatment, oil gas condensation, oil recovery, waste gas treatment, waste gas emission online detection and PM particle online monitoring, and the moving sludge is continuously heated by an indirect stepped heating mode. The application does not relate to the content of sludge conditioning and mechanical dehydration, and its pyrolysis back produces the condensation of pyrolysis oil gas simultaneously and retrieves and recycle, has wasted the sensible heat of pyrolysis oil gas, needs to supply more outside heat and satisfies mummification carbonization requirement. In addition, the tail gas treatment only adopts a simple alkaline washing process, and the treatment of pollutants such as nitrogen oxides in the tail gas is not explained.
Chinese patent application CN 108423961 a discloses a sludge treatment method, comprising the following steps: injecting the sludge into a reaction kettle, introducing saturated steam into the reaction kettle to cause the sludge to generate a thermal hydrolysis reaction, and obtaining slurry after thermal hydrolysis; injecting the obtained slurry into a filter press for mechanical filter pressing and dehydration to obtain a mud cake and filtrate; putting the obtained mud cake into a carbonization furnace
Carbonizing to obtain charcoal, pyrolysis gas and tar; a part of the obtained biochar is used as a catalyst for a thermal hydrolysis reaction and is back-mixed into a reaction kettle; and introducing the obtained pyrolysis gas and tar into a pyrolysis gas steam boiler after dedusting, and returning the generated high-temperature steam to the reaction kettle. This patent application carries out the technique of filter-pressing dehydration behind the pyrohydrolysis for steam and mud direct contact, has increased the energy conversion of steam, and the thermal efficiency is lower, and the pyrohydrolysis reation kettle only can be interrupted the feeding, is interrupted the ejection of compact, unable continuous production.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a sludge conditioning dehydration coupling carbonization reduction treatment method and system, which can realize reduction, harmlessness and recycling of sludge.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sludge conditioning dehydration coupling carbonization reduction treatment method comprises a flue gas flow and a sludge flow:
A. flue gas flow:
the heat source provides the required heat for the system, hot flue gas with the temperature of 800-;
B. a sludge flow path:
1) wet sludge with the water content of 80% is sent to the tempering tank from the raw sludge bin through a sludge pump;
2) directly conveying wet sludge with the water content of 95-97% into a conditioning tank through a sludge pump;
3) adding a medicament into a conditioning tank, homogenizing and conditioning, pumping the mixture to a mechanical filter pressing device through a sludge pump, reducing the water content in the sludge to 55-60% after filter pressing treatment, conveying the sludge subjected to filter pressing dehydration to a semi-dry sludge bin through conveying equipment, entering a sludge thermal drying dehydration system through a sludge buffer hopper, directly contacting and exchanging heat with hot flue gas at the temperature of 600 ℃ through a 300-plus-one, reducing the water content of the sludge to 20-40%, conveying the sludge to a pyrolysis carbonization system through a conveying device, heating the sludge in an inner cylinder of a carbonization furnace by a heat source outside the inner cylinder, such as a burner or hot flue gas, realizing pyrolysis through indirect heat exchange, indirectly heating the sludge by the high-temperature flue gas at the temperature of 800-1100 ℃ through a metal cylinder wall in the carbonization furnace, further heating, dehydrating, drying and carbonizing the sludge through heat conduction and heat radiation, separating out organic matters in the sludge in a volatile matter form, and (3) the sludge stays in the pyrolysis carbonization system for a certain time to finally form sludge carbon, the temperature of the sludge carbon is 400-600 ℃, the sludge carbon is cooled to below 50 ℃ by a cooling device, and then the sludge carbon is conveyed to a finished product warehouse for loading and transporting.
The interior of the metal inner cylinder in the carbonization furnace is provided with the enhanced heat transfer device to enhance the heat exchange with hot flue gas outside the cylinder wall, so that sludge is ensured to be lifted and fall down along with the rotating content in the cylinder, the contact area with the cylinder wall is increased, the mixing of wet materials and dry materials, and low-temperature materials and high-temperature materials is enhanced, and the synchronization of reaction is ensured.
The heat source is a hot blast stove, an SNCR denitration system is additionally arranged in the hot blast stove, and a reducing agent ammonia water solution is sprayed in a temperature range of hot flue gas temperature between 800 ℃ and 1100 ℃ to realize the removal of nitrogen oxides in the combustion process;
and (3) the volatile generated in the carbonization process is sent to a hot air furnace for combustion, the generated high-temperature flue gas with the temperature of 800-1100 ℃ sequentially enters a pyrolysis carbonization system, the flue gas temperature is 300-600 ℃ after being discharged from the pyrolysis carbonization system, the flue gas temperature enters a thermal drying dehydration system, the flue gas temperature is 100-150 ℃ after heat is released from the drying system, and the flue gas enters a tail gas treatment system, so that the gradient utilization of energy is realized, and the consumption of normal fuel is reduced.
The medicament is PAC medicament, lime or humic acid medicament. The medicament has the effect of breaking the wall of the sludge cell wall, and the moisture is more easily extruded in the subsequent mechanical dehydration link.
The tempering tank is made of steel, glass fiber reinforced plastic or concrete.
The mechanical filter pressing device adopts a high-pressure plate-and-frame filter press, a belt filter press, a vertical filter press or other existing mechanical filter pressing equipment.
The conveying equipment is a conveying belt or a scraper.
The sludge thermal drying and dewatering system adopts rotary drying equipment.
The conveying device is a screw conveyor, a scraper conveyor or other existing material conveying mechanisms.
According to the requirement of the emission standard, a bag-type dust collector or a wet-type electrostatic dust collector can be added to the dust collection device to ensure that the dust content reaches the standard; the desulfurization and denitrification device can adopt a wet system, the washing tower can adopt a single stage or multiple stages, the contents of sulfur oxides and nitrogen oxides in the tail gas can meet the emission standard requirements, and a semi-dry method or a dry method can be selected according to project conditions for removing acid gas; meanwhile, an SNCR (selective non-catalytic reduction) denitration system can be additionally arranged in the hot blast furnace as required to remove nitrogen oxides in the combustion process; the deodorizing device can adopt active carbon adsorption equipment or photo-oxygen and plasma equipment, and can also adopt biological deodorizing equipment to ensure that the odor in the tail gas meets the emission standard requirement.
A sludge conditioning dehydration coupling carbonization and reduction treatment system comprises a sludge receiving bin, wherein the sludge receiving bin is communicated with an inlet of a conditioning tank through a first sludge pump, an outlet of the conditioning tank is connected with an inlet of a mechanical pressure filter through a second sludge pump, an outlet of the mechanical pressure filter is communicated with an inlet of a semi-dry sludge bin, an outlet of the semi-dry sludge bin is communicated with an inlet of a sludge buffer hopper, an outlet of the sludge buffer hopper is communicated with an inlet of a sludge thermal drying and dehydration system through a conveying device, a sludge outlet of the sludge thermal drying and dehydration system is communicated with a sludge inlet of a pyrolysis and carbonization system, an air outlet of the sludge thermal drying and dehydration system is communicated with an air inlet of a cyclone dust collector, an air outlet and a bottom dust removing port of the cyclone dust collector are respectively connected with an air inlet of a desulfurization and denitrification system and a sludge inlet of the pyrolysis and carbonization system, and denitrification system is connected with, the outlet of the deodorization device is directly communicated with the outside atmosphere;
the air inlet of the pyrolysis carbonization system and the air inlet of the sludge thermal drying and dewatering system are sequentially communicated with the air outlet of the hot blast stove, the air outlet of the pyrolysis carbonization system is communicated with the air inlet of the hot blast stove, the sludge outlet of the pyrolysis carbonization system is communicated with the cooling device, and the sludge outlet of the cooling device is communicated with the finished product bin.
In the invention, wet sludge is divided into two types, one type is sludge with water content of 80% after primary dehydration, the sludge is pre-dehydrated and is transported from the outside and unloaded to a sludge receiving bin, the sludge needs to be diluted, homogenized and then conditioned, and the other type is sludge with water content of 95-97% in a sewage treatment plant, and the sludge can be directly conveyed to a conditioning system for conditioning by using a sludge pumping mode. Conventional PAC agents, lime, humic acid agents or the like are added in the conditioning process and are stirred and fully contacted, the agents have the wall breaking effect on sludge cell walls, and moisture is more easily extruded in the subsequent mechanical dehydration link.
And (4) recovering the water squeezed out by the filter pressing, and sending the water to a sewage treatment facility in the plant for standard treatment or returning the water to a sewage treatment plant for centralized treatment and standard emission.
Conveying the sludge subjected to mechanical filter pressing to a buffer hopper, and arranging an arch breaking device in the hopper to prevent bridging congestion of the sludge in the storage process; the size of the buffer hopper is set according to the requirement of the thermal drying system, so that the stable production of the drying system is ensured.
High-temperature hot air in the sludge thermal drying system directly contacts with wet sludge for heating, and a crushing device is arranged in the drying system, so that sludge adhesion in the drying and dehydrating process is prevented, and the heat exchange efficiency is improved.
The carbonization system in the system adopts an indirect heating mode, sludge is heated by high-temperature flue gas (800-.
In the present invention, the Chinese meaning of SNCR is a selective non-catalytic reduction method.
Polyaluminium chloride is a new water purifying material, namely inorganic high-molecular coagulant, polyaluminium chloride for short, PAC (polyaluminium chloride) for short, which is between AlCI3And Al (OH)3The water-soluble inorganic high molecular polymer has high electric neutralization and bridging action on colloid and particles in water and can strongly neutralize and bridgeRemove micro-toxic substances and heavy metal ions, and has stable properties. Due to the bridging action of hydroxide ions and the polymerization action of polyvalent anions, the produced polyaluminium chloride is an inorganic macromolecular water treatment agent with relatively large molecular weight and relatively high charge.
Humic acid can complex macroelements of nitrogen, phosphorus and potassium and microelements of copper, iron, zinc, manganese and the like, and has the advantages of improving soil, enhancing the effect of nitrogen, phosphorus and potassium fertilizers, stimulating the growth of crops, increasing the yield, improving the quality of agricultural products and the like when being used as a fertilizer.
Compared with the Chinese patent application CN 107129124A, the invention adopts a burner or high-temperature flue gas for heating in the carbonization link, and adopts the residual heat of the carbonization link for heating in the drying process, so that the energy utilization rate is higher.
The invention has the beneficial effects that:
(1) the sludge treatment capacity is large, and the reduction is remarkable
The treatment capacity is large, the reduction is thorough, and the sludge volume and the total amount are reduced by 80-95% at one time.
(2) Is harmless and thorough
After the sludge is subjected to dehydration, coupling and carbonization treatment, various harmful pathogenic bacteria can be killed by 100 percent.
(3) Heavy metal is not released after being solidified
The heavy metal existing form in the sludge is more stable in the carbonization process and can not be released in the subsequent utilization
(4) The antibiotic is decomposed
The antibiotics are decomposed in the carbonization process, so that the risk factors of subsequent utilization are eliminated.
(5) No generation of dioxin
The sludge pyrolysis process is an anaerobic environment, and dioxin is not generated in the combustion process.
(6) The sludge carbon product can be safely utilized
The product of the pyrolysis and carbonization of the sludge is sludge biochar, contains elements such as nitrogen, phosphorus and potassium, is fixed and stabilized by heavy metal, can be used as garden nutrient soil and an adsorbent for safe use, and accords with the development idea of circular economy.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
in the figure, 1-a sludge receiving bin, 2-a first sludge pump, 3-a conditioning tank, 4-a second sludge pump, 5-a mechanical filter pressing device, 6-a hot blast furnace, 7-a semi-dry sludge bin, 8-a sludge buffer hopper, 9-a feeding screw, 10-a sludge thermal drying and dewatering system, 11-a cyclone dust collector, 12-a desulfurization and denitrification system, 13-a system induced draft fan, 14-a deodorization device, 15-a pyrolysis and carbonization system, 16-a cooling device and 17-a finished product bin.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in figure 1, the sludge conditioning dehydration coupling carbonization and reduction treatment system comprises a raw sludge bin 1, wherein the raw sludge bin 1 is communicated with an inlet of a conditioning tank 3 through a first sludge pump 2, an outlet of the conditioning tank 3 is connected with an inlet of a mechanical filter pressing device 5 through a second sludge pump 4, an outlet of the mechanical filter pressing device 5 is communicated with an inlet of a semi-dry sludge bin 7, an outlet of the semi-dry sludge bin 7 is communicated with an inlet of a sludge buffer hopper 8, an outlet of the sludge buffer hopper 8 is communicated with an inlet of a sludge thermal drying and dewatering system 10 through a feeding screw 9, a sludge outlet of the sludge thermal drying and dewatering system 10 is communicated with a sludge inlet of a pyrolysis and carbonization system 15, an air outlet of the sludge thermal drying and dewatering system 10 is communicated with an air inlet of a cyclone dust collector 11, an air outlet and a bottom dust removing port of the cyclone dust collector 11 are respectively connected with an air inlet of a desulfurization and denitrification system 12 and a sludge inlet of the pyrolysis, an air outlet of the desulfurization and denitrification system 12 is connected with an inlet of a deodorization device 14 through a system induced draft fan 13, and an outlet of the deodorization device 14 is directly communicated with the outside atmosphere;
the air inlet of the pyrolysis carbonization system 15 and the air inlet of the sludge thermal drying and dewatering system 10 are communicated with the air outlet of the hot blast stove 6 in sequence, the air outlet of the pyrolysis carbonization system 15 is communicated with the air inlet of the hot blast stove 6, the sludge outlet of the pyrolysis carbonization system 15 is communicated with the cooling device 16, and the sludge outlet of the cooling device 16 is communicated with the finished product bin 17.
Introduction to the technological Process
(1) Flue gas flow
The heat source of the invention provides the hot blast stove 6 with the heat required by the system, the hot flue gas (800 plus 1100 ℃) generated by the heat source system enters the pyrolysis carbonization system 15 under the action of a system draught fan to be indirectly heated with the sludge, the heat is absorbed by the carbonization process, the temperature after being discharged from the outlet of the pyrolysis carbonization system 15 is about 500 plus 600 ℃, the hot flue gas enters the sludge thermal drying dehydration system 10, the sludge is dried through strong heat-mass exchange, the temperature of the flue gas is reduced to below 150 ℃, the tail gas carries a small amount of dust to enter the cyclone dust collector 11 for solid-gas separation, then the tail gas enters the desulfurization and denitrification system 12, and the tail gas enters the deodorization device 14 after passing through the system draught fan 13 to be deodorized and purified and then reaches.
And the volatile matter generated in the carbonization process is sent to the hot blast stove 6 for combustion, so that heat is provided for the system, and the consumption of normal fuel is reduced.
(2) Sludge process
Wet sludge is divided into two types, one type is sludge with water content of 80% after primary dehydration, the other type is sludge with water content of 95-97% in a sewage treatment plant, and the sludge is conveyed from the outside and unloaded to the sludge receiving bin 1, the sludge needs to be diluted and homogenized before tempering treatment, and the other type is sludge with water content of 95-97% in the sewage treatment plant, and the sludge can be directly conveyed to a conditioning system for tempering treatment by using a sludge pumping mode. Adding conventional PAC agent, lime or humic acid agent, etc. during the conditioning process, stirring and fully contacting. The medicament has the effect of breaking the wall of the sludge cell wall, and the moisture is more easily extruded in the subsequent mechanical dehydration link. The tempering tank 3 can be made of steel, glass fiber reinforced plastics or concrete.
And (3) delivering the conditioned sludge to a mechanical filter pressing device 5, and after filter pressing and dehydration, reducing the water content of the sludge to 55-60%, wherein the mechanical filter pressing and dehydration can be performed by a high-pressure plate-and-frame filter press, a belt filter press, a vertical filter press or other mechanical filter pressing equipment. And (4) recovering the water squeezed out by the filter pressing, and sending the water to a sewage treatment facility in the plant for standard treatment or returning the water to a sewage treatment plant for centralized treatment and standard emission.
Conveying the filter-pressed and dehydrated sludge to a semi-dry sludge bin 7 through conveying equipment such as a belt or a scraper and the like, feeding the sludge into a thermal drying and dehydrating system 10 through a sludge buffer hopper 8, and arranging an arch breaking device in the buffer hopper 8 to prevent bridging and blocking of the sludge in a storage process; the size of the buffer hopper 8 is set according to the requirement of the thermal drying system, so that the stable production of the drying system is ensured.
Sludge with the water content of 50-65% in the buffer hopper enters a thermal drying dehydration system, directly contacts with high-temperature hot flue gas for heat exchange, volatilizes and separates out moisture in the sludge, and enters a tail gas treatment system along with hot air (the temperature is less than 150 ℃) for purification treatment; the sludge thermal drying adopts rotary drying equipment, high-temperature hot air is directly contacted with wet sludge for heating, a crushing device is arranged in the drying equipment, sludge adhesion in the drying and dehydrating process is prevented, and meanwhile, the heat exchange efficiency is improved; after the sludge is dried by a thermal drying dehydration system, the water content is reduced to 20-40 percent.
Then the sludge is conveyed to the pyrolysis carbonization system 15 through a conveying device, and the conveying device can adopt a spiral conveying mode, a scraper conveying mode or other material conveying modes. The sludge is indirectly heated by the high-temperature flue gas, the sludge is heated by the high-temperature flue gas (800-; heating the sludge at high temperature, separating out organic matters in the sludge in the form of volatile matters, evaporating and separating out residual moisture, and conveying the residual moisture and the heated volatile moisture into a hot blast furnace for incineration; the sludge stays in the pyrolysis carbonization system 15 for a certain time to finally form sludge carbon, the temperature of the sludge carbon is about 400-600 ℃, the sludge carbon is cooled to below 50 ℃ by the cooling device 16, and then the sludge carbon is conveyed to the finished product bin 17 to be loaded and transported outside.
The hot blast stove 6 provides a heat source for the system, natural gas, fuel oil, biomass fuel or other fuels can be adopted, meanwhile, the volatile matters separated out in the carbonization process are sent to the hot blast stove for combustion, the generated high-temperature flue gas (800-; and the tail gas is subjected to dust removal, desulfurization and denitrification and deodorization treatment and then is discharged after reaching the standard.
According to the requirement of the emission standard, a bag-type dust collector or a wet-type electrostatic dust collector can be added to the dust collection device to ensure that the dust content reaches the standard; the desulfurization and denitrification device can adopt a wet system, the washing tower can adopt a single stage or multiple stages, the contents of sulfur oxides and nitrogen oxides in the tail gas can meet the emission standard requirements, and a semi-dry method or a dry method can be selected according to project conditions for removing acid gas; meanwhile, an SNCR (selective non-catalytic reduction) denitration system can be additionally arranged in the hot blast furnace as required to remove nitrogen oxides in the combustion process; the deodorizing device can adopt active carbon adsorption equipment or photo-oxygen and plasma equipment, and can also adopt biological deodorizing equipment to ensure that the odor in the tail gas meets the emission standard requirement.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A sludge conditioning dehydration coupling carbonization reduction treatment method is characterized by comprising a flue gas flow and a sludge flow:
A. flue gas flow:
the heat source provides the required heat for the system, hot flue gas with the temperature of 800-;
B. a sludge flow path:
1) wet sludge with the water content of 80% is sent to the tempering tank from the raw sludge bin through a sludge pump;
2) directly conveying wet sludge with the water content of 95-97% into a conditioning tank through a sludge pump;
3) adding a medicament into a conditioning tank, homogenizing and conditioning, pumping the mixture to a mechanical filter pressing device through a sludge pump, reducing the water content in the sludge to 55-60% after filter pressing treatment, conveying the sludge subjected to filter pressing dehydration to a semi-dry sludge bin through conveying equipment, entering a sludge thermal drying dehydration system through a sludge buffer hopper, directly contacting and exchanging heat with hot flue gas at the temperature of 600 ℃ through a 300-plus-one, reducing the water content of the sludge to 20-40%, conveying the sludge to a pyrolysis carbonization system through a conveying device, heating the sludge in an inner cylinder of a carbonization furnace by a heat source outside the inner cylinder, such as a burner or hot flue gas, realizing pyrolysis through indirect heat exchange, indirectly heating the sludge by the high-temperature flue gas at the temperature of 800-1100 ℃ through a metal cylinder wall in the carbonization furnace, further heating, dehydrating, drying and carbonizing the sludge through heat conduction and heat radiation, separating out organic matters in the sludge in a volatile matter form, and (3) the sludge stays in the pyrolysis carbonization system for a certain time to finally form sludge carbon, the temperature of the sludge carbon is 400-600 ℃, the sludge carbon is cooled to below 50 ℃ by a cooling device, and then the sludge carbon is conveyed to a finished product warehouse for loading and transporting.
2. The sludge conditioning dehydration coupling carbonization and reduction treatment method as claimed in claim 1, wherein the heat source is a hot blast stove, an SNCR denitration system is additionally arranged in the hot blast stove, and a reducing agent ammonia solution is sprayed in a temperature range of hot flue gas temperature between 800 ℃ and 1100 ℃ to realize the removal of nitrogen oxides in the combustion process.
3. The sludge conditioning dehydration coupling carbonization and reduction treatment method as claimed in claim 1, wherein an enhanced heat transfer device is arranged in the inner metal cylinder of the carbonization furnace to enhance the heat exchange with the hot flue gas outside the cylinder wall, ensure that the sludge is lifted and falls down along with the rotating content in the cylinder, increase the contact area with the cylinder wall, enhance the mixing of the wet material and the dry material, and the low-temperature material and the high-temperature material, and ensure the synchronous reaction.
4. The sludge conditioning dehydration coupling carbonization and reduction treatment method as claimed in claim 1, wherein the volatile matters generated in the carbonization process are sent to a hot air furnace for combustion, the generated high-temperature flue gas with the temperature of 800-1100 ℃ sequentially enters a pyrolysis carbonization system, the flue gas temperature is 300-600 ℃ after being discharged from the pyrolysis carbonization system, the flue gas temperature enters a thermal drying and dehydration system, the flue gas temperature is 100-150 ℃ after heat is released from the drying system, and the flue gas enters a tail gas treatment system, so that the gradient utilization of energy is realized, and the consumption of normal fuel is reduced.
5. The sludge conditioning dehydration coupled carbonization and reduction treatment method as claimed in claim 1, wherein the agent is PAC agent, lime or humic acid agent; the tempering tank is made of steel, glass fiber reinforced plastic or concrete.
6. The sludge conditioning dehydration coupled carbonization and reduction treatment method as claimed in claim 1, wherein the mechanical filter press device adopts a high-pressure plate-and-frame filter press, a belt filter press or a vertical filter press.
7. The sludge conditioning dehydration coupled carbonization and reduction treatment method as claimed in claim 1, wherein the conveying device is a conveying belt or a scraper.
8. The sludge conditioning dehydration coupled carbonization and reduction treatment method as claimed in claim 1, wherein the sludge thermal drying dehydration system adopts a rotary drying device.
9. The sludge conditioning dehydration coupled carbonization and reduction treatment method as claimed in claim 1, wherein the conveying device is a screw conveyor or a scraper conveyor.
10. A sludge conditioning dehydration coupling carbonization and reduction treatment system is characterized by comprising a sludge receiving bin, wherein the sludge receiving bin is communicated with an inlet of a conditioning tank through a first sludge pump, an outlet of the conditioning tank is connected with an inlet of a mechanical filter pressing device through a second sludge pump, an outlet of the mechanical filter pressing device is communicated with an inlet of a semi-dry sludge bin, an outlet of the semi-dry sludge bin is communicated with an inlet of a sludge buffer hopper, an outlet of the sludge buffer hopper is communicated with an inlet of a sludge thermal drying and dehydration system through a conveying device, a sludge outlet of the sludge thermal drying and dehydration system is communicated with a sludge inlet of a pyrolysis and carbonization system, an air outlet of the sludge thermal drying and dehydration system is communicated with an air inlet of a cyclone dust collector, an air outlet and a bottom dust removing port of the cyclone dust collector are respectively connected with an air inlet of a desulfurization and denitrification system and a sludge inlet of the pyrolysis and carbonization system, and denitrification system is connected, the outlet of the deodorization device is directly communicated with the outside atmosphere;
the air inlet of the pyrolysis carbonization system and the air inlet of the sludge thermal drying and dewatering system are sequentially communicated with the air outlet of the hot blast stove, the air outlet of the pyrolysis carbonization system is communicated with the air inlet of the hot blast stove, the sludge outlet of the pyrolysis carbonization system is communicated with the cooling device, and the sludge outlet of the cooling device is communicated with the finished product bin.
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| CN111253033A (en) * | 2020-03-12 | 2020-06-09 | 北京云水浩瑞环境科技有限公司 | System and method for mobile treatment of sludge in villages and towns |
| CN112797421A (en) * | 2020-12-18 | 2021-05-14 | 浙江三联环保科技股份有限公司 | Sludge drying and incinerating system |
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| CN114249514A (en) * | 2021-12-06 | 2022-03-29 | 中国科学院城市环境研究所 | Harmless resource utilization method and device for tanning chromium-containing sludge |
| CN114538728A (en) * | 2022-04-19 | 2022-05-27 | 北京汇潮云集科技有限公司 | Sludge treatment system and sludge treatment method |
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| CN114835365A (en) * | 2022-01-20 | 2022-08-02 | 王凯军 | High-water-content sludge high-pressure dehydration-heat drying-pyrolysis integrated device and method |
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| CN115108697A (en) * | 2022-08-30 | 2022-09-27 | 中国科学院大学 | Safe conversion and safe resource utilization process for pyrolysis of sludge containing new pollutants |
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| CN112797421A (en) * | 2020-12-18 | 2021-05-14 | 浙江三联环保科技股份有限公司 | Sludge drying and incinerating system |
| CN113998866A (en) * | 2021-10-29 | 2022-02-01 | 广东尚鼎环境科技有限公司 | Organic solid waste treatment system and treatment process thereof |
| CN114249514A (en) * | 2021-12-06 | 2022-03-29 | 中国科学院城市环境研究所 | Harmless resource utilization method and device for tanning chromium-containing sludge |
| CN114249514B (en) * | 2021-12-06 | 2024-01-23 | 中国科学院城市环境研究所 | Harmless recycling method and device for tanning chromium-containing sludge |
| CN114835365A (en) * | 2022-01-20 | 2022-08-02 | 王凯军 | High-water-content sludge high-pressure dehydration-heat drying-pyrolysis integrated device and method |
| CN114702218A (en) * | 2022-03-25 | 2022-07-05 | 徐州沃力能源科技有限公司 | Municipal sludge and gasified slag co-processing method |
| CN114702226A (en) * | 2022-03-31 | 2022-07-05 | 安徽省通源环境节能股份有限公司 | Sludge classification drying carbonization system |
| CN114538728A (en) * | 2022-04-19 | 2022-05-27 | 北京汇潮云集科技有限公司 | Sludge treatment system and sludge treatment method |
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| CN115108697A (en) * | 2022-08-30 | 2022-09-27 | 中国科学院大学 | Safe conversion and safe resource utilization process for pyrolysis of sludge containing new pollutants |
| CN115301205A (en) * | 2022-09-19 | 2022-11-08 | 安徽工程大学 | Preparation method of sludge-based biochar granules and biochar granules |
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