CN115572033A - Two-stage carbonization system and method for preparing sludge carbon - Google Patents

Two-stage carbonization system and method for preparing sludge carbon Download PDF

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Publication number
CN115572033A
CN115572033A CN202211137901.6A CN202211137901A CN115572033A CN 115572033 A CN115572033 A CN 115572033A CN 202211137901 A CN202211137901 A CN 202211137901A CN 115572033 A CN115572033 A CN 115572033A
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sludge
carbonization
preparing
skeleton
stage
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Inventor
付兴民
王佳伟
蒋勇
王玮
赵亚伟
韩军
文洋
任征然
程晓菁
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Beijing Drainage Group Co Ltd
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Beijing Drainage Group Co Ltd
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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
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
    • 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
    • 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
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • 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
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
    • C—CHEMISTRY; METALLURGY
    • 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
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • C—CHEMISTRY; METALLURGY
    • 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
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • C10B57/10—Drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
    • B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
    • 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

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  • Analytical Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a two-stage carbonization system and a method for preparing sludge carbon, which comprises the following steps: the two-stage carbonization system for preparing the sludge carbon is used for carrying out two-stage combination of pressure reduction carbonization and pressure boost carbonization, firstly carrying out pressure reduction carbonization and then carrying out pressure boost carbonization, forming a gas dredging pore channel on the surface of the sludge particle, and improving the specific surface area of the sludge carbon of the sludge particle.

Description

Two-stage carbonization system and method for preparing sludge carbon
Technical Field
The invention belongs to the technical field of sludge carbon preparation, and particularly relates to a two-stage carbonization system and a two-stage carbonization method for preparing sludge carbon.
Background
The sludge carbon is a black solid material obtained by carbonizing sludge under the air-isolated condition, has certain adsorption capacity, and can be used for adsorbing materials, carrier materials, framework materials and the like. In recent years, with the popularization and application of sludge carbonization projects, the total sludge carbon yield is increased, and the application routes and effects of sludge carbon form key factors restricting the normal operation of the sludge carbonization projects.
Under the existing working conditions, the specific surface area of the sludge carbon is usually lower than 80m 2 The adsorption capacity is low, the performance is poor when the adsorbent is used for adsorbing materials, and the application is limited.
When the liquid phase pollutants are adsorbed by biochar such as sludge carbon, coconut shell carbon and the like, the pollutants are adsorbed on the surface of the biochar, so that the adsorption capacity of the biochar cannot be effectively expressed, and the adsorption capacity of the biochar is restricted.
Disclosure of Invention
The invention aims to provide a two-stage carbonization system for preparing sludge carbon, which combines pressure reduction carbonization and pressure boost carbonization in two stages, so that a gas dredging pore channel is formed on the surface of sludge particles, and the specific surface area of the sludge carbon of the sludge particles is increased.
In order to accomplish the above objects, the present invention provides a two-stage carbonization system for preparing sludge carbon, comprising:
the conditioning and dewatering unit is used for making mud cakes;
the sludge drying unit is used for preparing the sludge cake into skeleton sludge particles and drying the skeleton sludge particles;
and the pressure reduction carbonization unit and the pressure boost carbonization unit sequentially carbonize the skeleton sludge particles.
A two-stage carbonization method for preparing sludge carbon, which utilizes the two-stage carbonization system for preparing sludge carbon, comprises the following steps:
mixing the sludge with a support framework and deeply dehydrating to prepare a sludge cake;
preparing the mud cake into skeleton sludge particles and drying the skeleton sludge particles;
carbonizing the dried skeleton-system sludge particles under a reduced pressure condition until a gas dredging pore channel is formed;
and (3) secondarily carbonizing the skeleton sludge particles under the pressurization condition, and enlarging and/or increasing gas dredging pore channels.
Optionally, the supporting framework of the framework-based sludge particles comprises at least one of a biomass framework and a biochar framework.
Optionally, the particle size of the support skeleton is 0.5 mm-5 mm.
Optionally, the adding proportion of the supporting framework is 20% -50%.
Optionally, the water content of the dried skeleton-system sludge particles is 10-20%.
Optionally, the particle size of the skeleton-based sludge particles is 5mm to 10mm.
Optionally, the reduced pressure conditions include a temperature of 300 to 450 ℃ and a gauge pressure of-50 to-10 kPa.
Optionally, the pressurization conditions include a temperature of 600 to 800 ℃ and a gauge pressure of 10 to 50kPa.
Optionally, the carbonization time is not less than 30min.
The invention provides a two-stage carbonization system for preparing sludge carbon, which has the beneficial effects that:
1. the two-stage carbonization system for preparing the sludge carbon is combined with two stages of pressurization carbonization through decompression carbonization and pressurization carbonization, decompression carbonization is firstly carried out, pressurization carbonization is then carried out, a gas dredging pore channel is formed on the surface of sludge particles, and the specific surface area of the sludge carbon of the sludge particles is increased.
2. Through first order decompression carbonization earlier, improve the gaseous desorption power in mud particle surface through reducing the system pressure difference, promote the inside volatile matter of mud particle to separate out fast and accomplish the desorption, thereby reach the purpose of punching fast in the large amount of stages of separating out of material volatile matter, rethread second level pressure boost carbonization, through increasing under the present high temperature condition of compaction, increase the dwell time of volatile matter at particle surface and inside, thereby realize the emergence probability of the secondary pyrolysis of volatile matter and living beings carbon, thereby realize the mesh of reaming and pore-forming under the high temperature condition.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic flow diagram of a two-stage carbonization system for preparing sludge carbon according to an embodiment of the present invention.
Description of the reference numerals:
1. a conditioning dehydration unit; 2. a sludge drying unit; 3. a reduced pressure carbonization unit; 4. and a pressure-charging carbonization unit.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows a schematic flow diagram of a two-stage carbonization system for preparing sludge carbon according to an embodiment of the present invention.
As shown in fig. 1, a two-stage carbonization system for preparing sludge carbon includes:
a conditioning and dewatering unit 1 for making mud cakes;
the sludge drying unit 2 is used for preparing the sludge cakes into skeleton sludge particles and drying the skeleton sludge particles;
and the pressure reduction carbonization unit 3 and the pressure increase carbonization unit 4 sequentially carbonize the skeleton sludge particles.
Specifically, the particle size of a support framework of the framework sludge particles is 0.5-5 mm, the adding proportion is 20-50%, the pressure reduction carbonization and the pressurization carbonization are combined, the pressure reduction carbonization is firstly carried out, then the pressurization carbonization is carried out, a gas dredging pore channel is formed on the surface of the sludge particles, and the increase of the sludge carbon specific surface area of the sludge particles is improved.
Further, the first-stage pressure reduction carbonization improves the gas desorption power on the surface of the sludge particles by reducing the pressure difference of the system, promotes the rapid separation of volatile components in the sludge particles and completes the desorption, thereby achieving the purpose of rapid perforation at the stage of large-amount separation of the volatile components of the materials;
second-stage pressurizing carbonization, namely increasing the retention time of volatile components on the surfaces and inside the particles under the high-temperature condition by pressurizing and compacting, thereby realizing the occurrence probability of secondary cracking of the volatile components and the biomass carbon, and further realizing the purposes of reaming and pore-forming under the high-temperature condition
A two-stage carbonization method for preparing sludge carbon, which utilizes the two-stage carbonization system for preparing sludge carbon, comprises the following steps:
mixing the sludge with a supporting framework and deeply dehydrating to prepare a sludge cake;
preparing the mud cake into skeleton sludge particles and drying the skeleton sludge particles;
carbonizing the dried skeleton-system sludge particles under a reduced pressure condition until a gas dredging pore channel is formed;
and (3) secondarily carbonizing the skeleton sludge particles under the pressurization condition, and enlarging and/or increasing gas dredging pore channels.
Specifically, the sludge conditioning, the sludge drying, the pressure reduction and the pressurization carbonization are sequentially carried out, so that the specific surface area of the sludge carbon is increased.
Further, when the mud cake is manufactured, inorganic medicament is added at the rate of less than or equal to 2.0 percent, PAM: less than or equal to 5 per thousand.
Further, mixing the sludge with the support framework and deeply dehydrating the sludge to prepare a sludge cake comprises:
performing mesophilic anaerobic digestion on the sludge;
and mixing sludge argillaceous substances subjected to mesophilic anaerobic digestion with the supporting framework to obtain framework-system sludge particles.
In this embodiment, the supporting framework of the framework-based sludge particles includes at least one of a biomass framework and a biochar framework.
Specifically, biomass carbon such as rice hull carbon and straw carbon or biomass with high cellulose content such as rice hull and straw is used as a framework supporting material.
In this embodiment, the support skeleton has a particle size of 0.5mm to 5mm.
In this embodiment, the ratio of the support frame is 20% to 50%.
Particularly, the oversize sludge particles and the forming rate of the sludge particles of the finished product are avoided.
Furthermore, the selection of the particle size of the supporting framework is comprehensively determined mainly according to factors such as the content of organic components in the sludge, the type of the framework, the moisture content of dried sludge particles, carbonization pressure and temperature, and the like, and the main purpose is to realize the construction of target macropores through the control of the parameters so as to ensure that the internal pores of the sludge carbon are opened and ensure that the macropores play a role in the adsorption process of liquid-phase pollutants or aerosol pollutants. Meanwhile, the strength of the sludge carbon particles after the two-stage carbonization is also considered for determining the particle size of the supporting framework. Therefore, the supporting framework has the particle size of 0.5 mm-5 mm, and the optimal effect is achieved when the addition ratio is 20% -50%.
In this embodiment, the water content of the dried framework-based sludge particles is 10% to 20%.
Specifically, the intensity of the sludge particles in the range of 10% -20% is high, the surfaces of the sludge particles are dry, and the interior of the sludge particles entraps water due to mass transfer resistance. When the two-stage anaerobic digestion is carried out on the water, the water in the water is quickly separated out from the surfaces of the material particles along with pyrolysis volatile components at the controlled carbonization temperature during the first-stage pressure reduction carbonization, so that gas dredging channels are formed on the surfaces of the particles, the surface areas of the sludge particles are increased by utilizing the gas dredging channels, and the adsorption capacity is further improved.
In this example, the particle size of the skeletal sludge particles is 5mm to 10mm.
In this embodiment, the decompression conditions include a temperature of 300 to 450 ℃ and a gauge pressure of-50 to-10 kPa.
In this embodiment, the pressurization conditions include a temperature of 600 to 800 ℃ and a gauge pressure of 10 to 50kPa.
In the present embodiment, the carbonization time period is not less than 30min.
Example 1
(1) Advanced anaerobic digestion of sludge
After the primary sedimentation and the residual sludge are subjected to mesophilic anaerobic digestion at 165 ℃ for 30min, the solid content of the sludge is 6.4 percent, and the ash content is 55 percent.
(2) Sludge conditioning
The method is characterized in that rice husk carbon is used as a sludge conditioning dehydration framework supporting material, and the adding proportion is as follows: 50 percent; the adding amount of aluminum sulfate is 1 percent, and the adding amount of PAM is 5 per mill. A plate-and-frame filter press is used as a deep dehydration machine, and the water content of the dehydrated mud cake is 56.57 percent.
(3) Sludge drying
A low-temperature heat pump dryer is used as a drying dehydration machine, sludge cakes are extruded and granulated into particles with the particle size of 5mm, and the moisture content of the sludge is reduced to 20% after drying treatment.
(4) Pressure-reducing and pressure-increasing carbonization
Adopting a decompression carbonization unit 3 and a pressurization carbonization unit 4 to carry out sludge carbonization treatment, wherein:
pressure-reducing carbonization unit 3: temperature 400 ℃, residence time: 30min, gauge pressure: -20kPa.
Pressure-charging carbonization unit 4: temperature 700 ℃, residence time: 30min, gauge pressure: 30kPa.
(5) Sludge carbon
After carbonization treatment, the specific surface area of the sludge carbon is obtained: 585m2/g, methylene blue adsorption: 212mg/g.
Example 2
(1) Advanced anaerobic digestion of sludge
After primary sedimentation and excess sludge are subjected to mesophilic anaerobic digestion at 165 ℃ for 30min, the solid content of the sludge is 6.4%, and the ash content is 55%.
(2) Sludge conditioning
The method is characterized in that rice husk carbon is used as a sludge conditioning dehydration framework supporting material, and the adding proportion is as follows: 50 percent; the adding amount of aluminum sulfate is 1 percent, and the adding amount of PAM is 5 per mill. A plate-and-frame filter press is used as a deep dehydration machine, and the water content of the dehydrated mud cake is 58.63 percent.
(3) Sludge drying
A low-temperature heat pump drier is used as a drying dehydration machine, sludge cakes are extruded and granulated into particles with the particle size of 5mm, and the moisture content of the sludge is reduced to 20% after drying treatment.
(4) Pressure-reducing and pressure-increasing carbonization
Adopt decompression carbonization unit 3 and pressure boost carbonization unit 4 to carry out sludge carbonization, wherein:
pressure reduction carbonization unit 3: temperature 400 ℃, residence time: 30min, gauge pressure: -20kPa.
Pressure-charging carbonization unit 4: temperature 700 ℃, residence time: 30min, gauge pressure: 30kPa.
(5) Sludge carbon
After carbonization treatment, the specific surface area of the sludge carbon is obtained: 672m2/g, methylene blue adsorption value: 246mg/g.
Example 3
(1) Advanced anaerobic digestion of sludge
After primary sedimentation and excess sludge are subjected to mesophilic anaerobic digestion at 165 ℃ for 30min, the solid content of the sludge is 6.4%, and the ash content is 55%.
(2) Sludge conditioning
Rice hulls are used as a supporting material of a sludge conditioning dehydration framework, and the adding proportion is as follows: 40 percent; the adding amount of aluminum sulfate is 1.5 percent, and the adding amount of PAM is 5 per mill. A plate-and-frame filter press is used as a deep dehydration machine, and the water content of the dehydrated mud cakes is 55.63 percent.
(3) Sludge drying
A low-temperature heat pump drier is used as a drying dehydration machine, sludge cakes are extruded and granulated into particles with the diameter of 10mm, and the moisture content of the sludge is reduced to 20% after drying treatment.
(4) Carbonizing under reduced pressure and increased pressure
Adopt decompression carbonization unit 3 and pressure boost carbonization unit 4 to carry out sludge carbonization, wherein:
pressure-reducing carbonization unit 3: temperature 300 ℃, residence time: 45min, gauge pressure: -20kPa.
Pressure-charging carbonization unit 4: temperature 700 ℃, residence time: 30min, gauge pressure: 30kPa.
(5) Sludge carbon
After carbonization treatment, the specific surface area of the sludge carbon is obtained: 981m2/g, methylene blue adsorption value: 355mg/g.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (10)

1. A two-stage carbonation system for producing a peat, comprising:
the conditioning and dewatering unit is used for making mud cakes;
the sludge drying unit is used for preparing the sludge cake into skeleton sludge particles and drying the skeleton sludge particles;
and the pressure reduction carbonization unit and the pressure boost carbonization unit sequentially carbonize the skeleton sludge particles.
2. A two-stage carbonization method for producing sludge carbon, which is characterized by using the two-stage carbonization system for producing sludge carbon according to claim 1, comprising:
mixing the sludge with a supporting framework and deeply dehydrating to prepare a sludge cake;
preparing the mud cake into skeleton sludge particles and drying the skeleton sludge particles;
carbonizing the dried skeleton-system sludge particles under a reduced pressure condition until a gas dredging pore channel is formed;
and (3) secondarily carbonizing the skeleton sludge particles under the pressurization condition, and enlarging and/or increasing gas dredging pore channels.
3. The two-stage carbonization method for preparing sludge carbon according to claim 2, wherein the supporting framework of the skeletal sludge particles comprises at least one of a biomass framework and a biochar framework.
4. The two-stage carbonization method for preparing sludge carbon according to claim 2, wherein the supporting skeleton has a particle size of 0.5mm to 5mm.
5. The two-stage carbonization method for preparing sludge carbon as claimed in claim 2, wherein the supporting skeleton is added in a proportion of 20 to 50%.
6. The two-stage carbonization method for preparing sludge carbon as claimed in claim 2, wherein the water content of the dried skeletal sludge particles is 10-20%.
7. The two-stage carbonization method for preparing sludge carbon as claimed in claim 2, wherein the particle size of the skeletal sludge particles is 5mm to 10mm.
8. The two-stage carbonization method for producing sludge carbon according to claim 2, wherein the decompression conditions comprise a temperature of 300 to 450 ℃ and a gauge pressure of-50 to-10 kPa.
9. A two-stage carbonization process for preparing peat according to claim 2 wherein the pressure conditions comprise a temperature of 600 to 800 ℃ and a gauge pressure of 10 to 50kPa.
10. The two-stage carbonization method for preparing peat according to claim 2, wherein the carbonization time is not less than 30min.
CN202211137901.6A 2022-09-19 2022-09-19 Two-stage carbonization system and method for preparing sludge carbon Pending CN115572033A (en)

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