CN112028448A - Sludge treatment and building material resource utilization system and process - Google Patents

Sludge treatment and building material resource utilization system and process Download PDF

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Publication number
CN112028448A
CN112028448A CN202010992192.4A CN202010992192A CN112028448A CN 112028448 A CN112028448 A CN 112028448A CN 202010992192 A CN202010992192 A CN 202010992192A CN 112028448 A CN112028448 A CN 112028448A
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CN
China
Prior art keywords
unit
sludge
drying
heat
area
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Pending
Application number
CN202010992192.4A
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Chinese (zh)
Inventor
张潇源
傅潇
程文浩
傅桂操
黄霞
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Mintian Environmental Protection Technology Beijing Co ltd
Tsinghua University
Original Assignee
Mintian Environmental Protection Technology Beijing Co ltd
Tsinghua University
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Application filed by Mintian Environmental Protection Technology Beijing Co ltd, Tsinghua University filed Critical Mintian Environmental Protection Technology Beijing Co ltd
Priority to CN202010992192.4A priority Critical patent/CN112028448A/en
Publication of CN112028448A publication Critical patent/CN112028448A/en
Pending legal-status Critical Current

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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
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00Clay-wares
    • C04B33/02Preparing or treating the raw materials individually or as batches
    • C04B33/13Compounding ingredients
    • C04B33/132Waste materials; Refuse; Residues
    • C04B33/1321Waste slurries, e.g. harbour sludge, industrial muds
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/60Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Abstract

The invention discloses a sludge treatment and building material resource utilization system and process. The system comprises: the sludge treatment area is provided with a sludge drying unit and a heated kang unit positioned at the lower part of the sludge drying unit, a dehumidifying and condensing assembly is arranged in the sludge drying unit, and the sludge treatment area has a closed structure; raw materials shaping district links to each other with the mud processing district, the drying district links to each other with the raw materials shaping district, sintering kiln district links to each other with the drying district, sintering kiln district has consecutive intensification unit, the calcination unit, heat preservation unit and cooling unit, the drying district links to each other with the intensification unit, wherein, the heated kang unit has high temperature heat supply interface, sludge drying unit has the foul smell row mouth, the heat preservation unit has high temperature waste heat export, the drying district has the moisture discharge export, the moisture discharge export links to each other with the cooling unit, the foul smell row mouth links to each other with the calcination unit, high temperature waste heat export links to each other with high temperature heat supply interface. The system has high energy utilization rate and can realize high-efficiency utilization of material energy.

Description

Sludge treatment and building material resource utilization system and process
Technical Field
The invention relates to the field of sludge treatment and chemical industry, in particular to a sludge treatment and building material resource utilization system and process, and more particularly relates to a sludge treatment system and a sludge treatment method.
Background
With the rapid development of economic society, the discharge amount of domestic sewage and industrial wastewater is increasing day by day, the sludge yield is increased along with the establishment and the use of a large number of sewage treatment plants, and the realization of reasonable treatment and disposal of sludge is an important problem to be solved at present. According to the national conditions and the existing economic conditions, the dewatered sludge landfill is still an indispensable transitional disposal way within a long period of time, but the technology can cause secondary pollution and seriously threaten the ecological environment and human activities. The economy develops at a high speed, and the demand for building materials is greatly increased. Industries such as building materials and the like have large clay demand, so that clay resources are exploited in large quantities, and the quantity and the quality of farmlands are adversely affected. The sludge mainly comprises Fe2O3、Al2O3、SiO2The properties of the clay minerals such as CaO, MgO and the like are similar to those of clay, so that the sludge building material resource utilization is a sludge disposal and resource utilization method with development potential, and has good environmental benefit and economic benefit.
However, the current sludge treatment systems, particularly sludge-to-building treatment systems, and methods for treating sludge still need to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
In view of the above, in one aspect of the present invention, a sludge treatment system is provided. The system comprises: the system comprises a sludge disposal area, a heating kang unit and a moisture absorption and condensation component, wherein the sludge disposal area is provided with a sludge drying unit and the heating kang unit which is positioned at the lower part of the sludge drying unit; the raw material forming area is connected with the sludge disposal area so as to prepare a wet sintered product blank from a raw material mixed with the dried sludge treated by the sludge disposal area; the drying area is connected with the raw material forming area and is used for dehydrating the wet sintered product blank to form a sintered product blank; and a sintering kiln furnace region, the sintering kiln furnace region with the drying region links to each other, is used for right the calcination processing is carried out to the sintering goods base in order to form the brick material, the sintering kiln furnace region has consecutive intensification unit, calcination unit, heat preservation unit and cooling unit, the drying region with the intensification unit links to each other, wherein, the hotbed unit has high temperature heat supply interface, the sludge drying unit has the foul smell row mouth, the heat preservation unit has high temperature waste heat export, the drying region has the moisture discharge export, the moisture discharge export with the cooling unit links to each other, the foul smell row mouth with the calcination unit links to each other, high temperature waste heat export with the high temperature heat supply interface links to each other the energy utilization rate of this system high, can pass through the mummification mud that the sludge drying unit handled for raw and expect to prepare building materials product through the sintering. The system can reasonably utilize the redundant heat of the sintering kiln area to provide a heat source for the processes of sludge dehydration, drying and the like, and the toxic and harmful odor generated by the sludge drying unit can be directly sent into the sintering kiln area to be calcined at high temperature without influencing the brick making quality. In conclusion, the system can realize the final disposal and resource utilization of the sludge in a harmless, resource and production manner, can reduce the environmental pollution, can realize the high-efficiency utilization of material energy, and has considerable environmental and economic benefits.
According to the embodiment of the invention, the system further comprises a drying hot gas condensing unit and a heat distribution unit, wherein the heat distribution unit is connected with the heated kang unit, the drying hot gas condensing unit is provided with a damp-exhausting hot gas inlet, a condensed gas outlet and a condensed water outlet, the damp-exhausting hot gas inlet is connected with the dehumidifying and condensing assembly, the condensed gas outlet is connected with the heat distribution unit, and the condensed water outlet is connected with the raw material forming area. Therefore, the residual heat and the moisture in the hot air for drying the sludge in the sludge disposal area can be fully utilized.
According to the embodiment of the invention, the sludge drying unit further comprises a heat distribution unit circulating heat distribution inlet and a condensed gas inlet, the condensed gas inlet is connected with the condensed gas outlet of the drying hot gas condensing unit, and the heat distribution unit circulating heat distribution inlet is connected with the heat distribution unit and is positioned at the opposite side of the condensed gas inlet. Therefore, hot air circulation can be formed in the sludge drying area, and the efficiency and effect of sludge drying are further improved.
According to the embodiment of the invention, the heated kang unit further comprises at least two hot air convection outlets, the sludge drying zone further comprises two hot air convection inlets which are oppositely arranged, and the hot air convection inlets are connected with the hot air convection outlets. Therefore, hot air circulation can be formed in the sludge drying area, and the efficiency and effect of sludge drying are further improved.
According to an embodiment of the present invention, the heat distribution unit further comprises a heat distribution tail air outlet connected to the pre-drying unit of the drying zone; or the heat distribution tail air outlet is connected with the heat preservation unit; or the heat distribution tail air outlet is connected with the cooling unit; or the heat distribution tail air outlet is connected with the wet blank static stop unit of the raw material forming area. Therefore, the system can carry out resource allocation more reasonably according to production needs.
According to the embodiment of the invention, the heated kang unit further comprises at least two hot air convection outlets, the sludge drying unit further comprises two hot air convection inlets which are oppositely arranged, and the hot air convection inlets are connected with the hot air convection outlets. Thereby further improving the sludge drying effect.
According to an embodiment of the present invention, the hypocaust unit has at least one of the following structures: the heat conduction steel plate is positioned on one side, close to the sludge drying unit, in the heated kang unit; the heat conduction rib is positioned on one side, far away from the sludge drying unit, of the heat conduction steel plate; the vent hole penetrates through the heat conduction steel plate and is communicated with the heated kang unit and the sludge drying unit; the top of one side of the sludge drying unit, which is far away from the heated kang unit, is of a glass structure; the hot kang unit is provided with an S-shaped flue. Thereby, the heat transfer efficiency can be further improved.
According to the embodiment of the invention, the air vent is connected with nozzles, and the nozzles are positioned in the sludge drying unit and distributed on two sides of the sludge accommodating area. Thereby, the heat transfer efficiency can be further improved.
According to an embodiment of the invention, the dehumidifying and condensing assembly comprises a moisture exhaust duct arranged above the sludge accommodating area. Therefore, the resource utilization rate of the system can be further improved.
According to the embodiment of the invention, a kiln car for containing a sintering product blank is arranged in the sintering kiln area, the kiln car can move from one side of the temperature rising unit to one side of the cooling unit, a plurality of burners are arranged at the top of the kiln car at the roasting unit, the burners are connected with the odor discharge port through a gas pipeline, and a fan is arranged on the gas pipeline. Therefore, the sintering quality of the sintering kiln zone can be further improved.
According to the embodiment of the invention, a plurality of high-temperature heat taking ports are formed in the top of the kiln car at the heat preservation unit and the cooling unit, and the high-temperature heat taking ports are connected with the high-temperature waste heat outlet. Therefore, the sintering quality of the sintering kiln zone can be further improved.
According to the embodiment of the invention, the temperature rising unit is provided with a smoke hot air outlet which is connected with the drying area; the cooling unit has a hot gas outlet connected to the drying zone. Therefore, the residual heat of the flue gas in the sintering kiln zone can be utilized.
According to the embodiment of the invention, the drying area comprises a pre-drying unit and a drying unit, the flue gas hot air outlet is connected with the drying unit, the drying unit further comprises a tail flue gas moisture outlet, and the tail flue gas moisture outlet is connected with a desulfurization dust remover; the hot gas outlet with the unit links to each other futilely in advance, the condenser has in the unit of doing in advance, the moisture discharge export with the condenser links to each other, the unit of doing in advance have with the outlet that the condenser links to each other. Therefore, the residual heat of the flue gas in the sintering kiln zone can be further utilized.
In yet another aspect of the present invention, the present invention provides a method for treating sludge using the sludge treatment system as described above. The method comprises the following steps: supplying sludge to a sludge disposal area so as to carry out drying treatment on the sludge by utilizing hot air of a heated kang unit positioned at the lower part of the sludge drying unit; supplying the sludge subjected to the drying treatment to a raw material forming area to form a wet sintered product blank; supplying the wet sintered product blank to a drying area so as to dehydrate the wet sintered product blank to form a green sintered product blank; and supplying the sintered product blank to a sintering kiln region so as to perform roasting treatment on the sintered product blank to form brick materials, wherein the drying treatment on the sludge comprises supplying hot air in a heat preservation unit in the sintering kiln region to the heated brick bed unit as the hot air, supplying wet air generated by a drying region to a cooling unit in the sintering kiln region, and supplying odor generated by the sludge drying unit to a roasting unit in the sintering kiln region for combustion. The method has at least one of the following advantages: the energy utilization rate is high, the drying sludge treated by the sludge treatment area can be used as raw materials to prepare building material products through sintering, the redundant heat of the sintering kiln area can be reasonably utilized, heat sources are provided for the processes of sludge dewatering and drying and the like, and the toxic and harmful odor generated by the sludge drying unit can be directly sent into the sintering kiln area to be subjected to high-temperature calcination treatment without affecting the brick making quality. In conclusion, the method can realize the final disposal and resource utilization of the sludge in a harmless, resource and production manner, can reduce the environmental pollution, can realize the high-efficiency utilization of the material energy, and has considerable environmental and economic benefits.
According to an embodiment of the invention, the method comprises: and hot gas convection is formed in the sludge drying unit. Therefore, the efficiency of sludge drying can be further improved.
According to an embodiment of the invention, the method further comprises: and supplying hot gas of the sludge drying unit to a drying hot gas condensing unit, supplying condensed gas to the sludge drying unit, and discharging condensed water from a condensed water outlet of the drying hot gas condensing unit. Therefore, the residual heat and the moisture in the hot gas of the sludge drying unit can be further utilized.
According to an embodiment of the invention, the sludge treatment system further comprises a drying hot gas condensing unit and a heat distribution unit, and the method further comprises: and supplying heated kang tail gas generated by the heated kang unit to the heat distribution unit, supplying moisture-discharging hot gas generated by the sludge drying unit to the drying hot gas condensing unit for condensation treatment, and supplying obtained cold air to the heat distribution unit for heat distribution. Therefore, the residual heat in the flue gas of the sintering kiln area and the moisture of the pre-drying unit can be further utilized.
According to an embodiment of the invention, the drying zone comprises a pre-drying unit and a drying unit, the method further comprising: supplying moisture generated by the pre-drying unit to a cooling unit in the sintering kiln region, and supplying residual heat generated by the cooling unit to the pre-drying unit; and supplying the flue gas generated by the temperature rising unit of the sintering kiln zone to the drying unit, supplying tail flue gas moisture generated by the drying unit to a desulfurization dust remover for desulfurization treatment, and supplying hot air containing the flue gas generated by the temperature rising unit to the drying unit. Therefore, the residual heat and the moisture in the hot gas of the sludge drying unit can be further utilized.
Drawings
FIG. 1 shows a schematic configuration of a sludge treatment system according to an embodiment of the present invention;
FIG. 2 shows a schematic view of a partial configuration of a sludge treatment system according to an embodiment of the present invention;
FIG. 3 shows a schematic view of a partial configuration of a sludge treatment system according to an embodiment of the present invention;
FIG. 4 is a schematic view showing a partial configuration of a sludge treatment system according to an embodiment of the present invention;
FIG. 5 shows a schematic view of a partial configuration of a sludge treatment system according to an embodiment of the present invention;
FIG. 6 is a schematic view showing a partial structure of a sludge treatment system according to an embodiment of the present invention;
FIG. 7 shows a schematic flow diagram of a sludge treatment process according to another embodiment of the present invention;
FIG. 8 shows a schematic configuration of a sludge treatment system according to an embodiment of the present invention;
FIG. 9 shows a schematic configuration of a sludge treatment system according to another embodiment of the present invention;
FIG. 10 shows a schematic configuration of a sludge treatment system according to another embodiment of the present invention;
FIG. 11 shows a schematic configuration of a sludge treatment system according to another embodiment of the present invention;
fig. 12 shows a schematic configuration of a sludge treatment system according to another embodiment of the present invention.
Description of reference numerals:
100: a sludge disposal area; 110: a heated brick bed unit; 11: a high temperature heat supply interface; 12: an odor outlet; 111: a diversion trench; 112: a heat conductive rib; 113: a heat conductive steel plate; 114: a top portion; 120: a sludge drying unit; 121: a harmful gas collector; 122: a dehumidifying and condensing assembly; 130: a vent hole; 131: a nozzle; 140: a drying hot gas condensing unit; 141: a moisture-removing hot gas inlet; 142: a condensed gas outlet; 143: a condensed water outlet; 150: a heat distribution unit; 151: a heat distribution unit circulation heat distribution outlet; 152: a heat distribution tail air outlet; 160: a water treatment unit; 200: a raw material forming area; 210: a wet blank forming unit; 220: a wet blank static stopping unit; 300: a sintering kiln zone; 310: a temperature raising unit; 320: a roasting unit; 330: a heat preservation unit; 340: a cooling unit; 31: a flue gas hot air outlet; 32: an odor inlet; 321: burning a nozzle; 323: a gas line; 324: a fan; 33: a high-temperature waste heat outlet; 34: a hot gas outlet; 35: a high-temperature heat taking port; 350: kiln car; 400: a drying zone; 410: a pre-drying unit; 420: a drying unit; 41: a moisture discharge outlet; 42: a tail smoke moisture outlet; 441: an external blower; 421: a desulfurizing dust remover.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the invention, a sludge treatment system is provided. Referring to fig. 1, the system includes: the system comprises a sludge disposal area 100, a raw material forming area 200, a drying area 400 and a sintering kiln area 300, wherein the sludge disposal area 100 is provided with a sludge drying unit 120 and a heated kang unit 110 positioned at the lower part of the sludge drying unit 120, a dehumidifying and condensing assembly 122 is arranged in the sludge drying unit, and the sludge disposal area has a closed structure. The raw material forming zone 200 is connected to the sludge disposal zone 100 to make the raw material mixed with the dried sludge processed by the sludge disposal zone into a wet green sintered product, for example, the raw material may include coal gangue, waste soil, etc. The drying zone 400 is connected to the raw material forming zone 200 for dehydrating the green compact of the sintered product to form a green compact of the sintered product. The sintering kiln area 300 is connected with the drying area 400 and used for roasting the sintered product blank to form brick materials, the sintering kiln area is provided with a temperature rising unit 310, a roasting unit 3230, a heat preservation unit 330 and a cooling unit 340 which are sequentially connected, and the drying area 400 is connected with the temperature rising unit 310. The heated brick bed unit 110 is provided with a high-temperature heat supply interface 11, the sludge drying unit 120 is provided with an odor exhaust port 12, the heat preservation unit 330 in the sintering kiln zone 300 is provided with a high-temperature waste heat outlet 33, the drying zone 400 is provided with a moisture exhaust outlet 41, the high-temperature waste heat outlet 33 is connected with the high-temperature heat supply interface 11, and the moisture exhaust outlet 41 is connected with the cooling unit 340 in the sintering kiln zone 300, so that the finished bricks in the cooling unit 340 can be cooled by absorbing a small amount of moisture. The odor outlet 12 can be connected to the firing unit 320 in the sintering kiln zone 300 through an odor inlet 32. The system has high energy utilization rate, and can prepare building material products by sintering the dried sludge treated by the sludge treatment area as a raw material. The system can reasonably utilize the redundant heat of the brick making kiln, provides a heat source for the processes of sludge dehydration, drying and the like, and can directly send toxic and harmful odor generated in the sludge disposal area into the brick making kiln for high-temperature calcination treatment without influencing the brick making quality. In conclusion, the system can realize the final disposal and resource utilization of the sludge in a harmless, resource and production manner, can reduce the environmental pollution, can realize the high-efficiency utilization of material energy, and has considerable environmental and economic benefits.
For ease of understanding, the following first briefly describes the principles by which the system can achieve the above-described benefits:
as mentioned above, the existing sludge treatment system has the problems of low utilization efficiency of resources such as residual heat and the like on one hand, and on the other hand, wet sludge cannot be directly mixed with raw materials such as waste soil, coal gangue and the like to be used for firing bricks, and needs to be dried in advance. And along with the dehydration and drying of the sludge in the drying treatment process, the gas of toxic and harmful substances generated or sent by the sludge in the drying process can be mixed in the drying hot gas, so that the drying hot gas cannot be directly utilized, and complex deodorization treatment is required. Therefore, the production cost of the sludge treatment system is further increased, and the resource utilization rate is not high. According to the system provided by the embodiment of the invention, the sludge drying efficiency of the sludge disposal area can be improved by reasonably designing the structures of the sludge disposal area, the raw material forming area, the sintering kiln area and the drying area, and the generated dried hot gas has low content of harmful substances, so that the dried hot gas can be directly supplied to the roasting unit in the sintering kiln area for combustion and heat release without complex deodorization treatment, and the quality of bricks fired by a roasting belt is not influenced. Meanwhile, the temperature of the roasting unit is high, the temperature of a roasting high-temperature zone can reach 1050 ℃, gases produced after the odor passes through the roasting unit are non-toxic and harmless, and operations such as waste heat utilization can be directly carried out, so that the production cost of the system can be reduced, and the overall resource utilization rate of the system is improved.
The following describes the structure and resource utilization of the system in detail according to the specific embodiment of the present invention:
according to the embodiment of the invention, the sludge is first dried in the sludge disposal area 100, so that the water content of the sludge is reduced, and odor containing toxic and harmful substances and water vapor is generated. The dried sludge enters the raw material forming zone 200, is mixed with raw materials including but not limited to waste soil, coal gangue and the like, and is subjected to series treatment to form a wet sintered product blank. The green compact of the sintered product is then fed to a drying zone 400 where it is dewatered to form a green sintered product, which is then fed to a sintering kiln zone 300 where it is fired to form a brick. Moisture in the drying zone 400 during the dewatering process can be sent to the cooling unit 340 through the moisture outlet 41, and the moisture can make the brick material in the cooling unit 340 absorb a small amount of moisture, which is beneficial to cooling the brick material. The connection relationship between the respective unit components and the utilization of resources such as gas and condensed water generated by the respective units will be described in detail later. According to the embodiment of the present invention, the hot air fed into the hypocaust unit 110 from the high-temperature waste heat outlet 33 may also be mixed and diluted, for example, the mixed hot air is introduced into the hypocaust unit 110, so that the waste of heat energy due to too high heat and too large temperature difference can be avoided. In order to further improve the drying efficiency of the sludge drying unit 120 and reduce the content of toxic and harmful substances in the odor, a gas circulation may be formed in the sludge drying unit 120. Some embodiments of forming the air circulation can refer to fig. 2, and include forming the hot air circulation in the sludge drying unit 120 (as shown by arrows in fig. 2) by communicating the air vent 130 of the heated kang unit 110 and the sludge drying unit 120, or by sending the hot air of the heated kang unit 110 to the sludge drying unit 120 through a pipeline.
Alternatively, referring to fig. 8, the system further includes a drying hot gas condensing unit 140, the drying hot gas condensing unit 140 is connected to the sludge drying unit 120, the drying hot gas condensing unit 140 has a moisture-containing hot gas inlet 141, a condensed gas outlet 142 and a condensed water outlet 143, the moisture-containing hot gas inlet 141 is connected to the sludge drying unit 120 to supply a part of the moisture-containing hot gas in the sludge drying unit 120 to the drying hot gas condensing unit 140 for condensation, and the generated condensed water is discharged from the condensed water outlet 143 and can enter the water treatment unit 160 for simple treatment, so as to be supplied to the raw material forming area 200, for example. The condensed gas may be supplied to the heat distribution unit 150 through the condensed gas outlet 142. The heat distribution unit 150 may re-distribute heat to the condensed air generated by the drying hot air condensing unit 140, for example, the heat of the heat distribution unit 150 may come from the hypocaust unit 110. The heated gas may be supplied to the sludge drying unit 120 through the heat distribution unit circulation heat distribution outlet 151. Thus, an outlet connected to the moisture-discharging hot gas inlet 141 in the sludge drying unit 120 may be configured to circulate the gas flow.
That is, in the present invention, the sludge drying process can be performed not only by the heat of the gas, but also by the gas circulation in the sludge drying unit 120 to reduce the moisture content of the wet sludge. Therefore, the content of toxic and harmful substances in the odor can be reduced while the water content of the sludge is reduced. In addition, the hypocaust unit 110 supplies part of the hot air to the heat distribution unit 150, thereby preventing heat energy waste caused by excessive heat in the hypocaust unit 110 or preventing the odor generation amount from rapidly increasing caused by excessive temperature of the sludge drying unit 120.
According to the embodiment of the invention, referring to fig. 3, the sludge drying unit adopts a closed drying process, so that the large-space sludge closed dehumidification drying function can be realized, the heat loss caused by dehumidification by discharging humid air is avoided compared with the traditional open drying process, and the heat utilization efficiency of the system is improved. In the closed drying process, a condensation and dehumidification link is configured, namely, a dehumidifying and condensing assembly 122 is arranged in the sludge drying unit. Therefore, the odor generated in the sludge drying process is sent into the kiln for incineration, the normal production of the kiln is not influenced, and the treatment cost and the equipment investment of the odor are greatly reduced.
According to some embodiments of the present invention, the top 114 of the side of the sludge drying unit away from the heated brick bed unit may be of a glass structure. Therefore, a large-space glass greenhouse can be built, a light-transmitting hollow heat-insulating glass closed workshop is arranged at the upper part of the greenhouse to form a sludge drying unit, the heated kang unit 120 at the bottom can adopt a ground kang structure, and a large-area steel plate can be used as a kang surface.
According to some embodiments of the present invention, referring to fig. 3 and 5, the dehumidifying condensation assembly 122 may include a moisture exhaust duct disposed above the sludge accommodating area. The dehumidifying and condensing assembly 122 may be connected to the drying hot air condensing unit 140, so as to utilize the residual heat and moisture in the wet air of the heatable brick bed unit 120. Therefore, the resource utilization rate of the system can be further improved. More specifically, the air vent 130 may be connected with nozzles 131 located in the sludge drying unit and arranged at both sides of the sludge accommodating area. Therefore, air circulation in the sludge drying unit can be further enhanced through the nozzle and the dehumidifying and condensing assembly 122, and the sludge drying effect is improved.
In addition, the inventor finds that the traditional sludge drying process is an open system, and has the defects of large air quantity for treating odor, low concentration but excessive concentration, high investment, high operation cost and the like if an odor treatment device is arranged. However, if the odor treatment device is not disposed for direct discharge, or only the simple odor treatment device is disposed without operation, the environmental pollution is likely to be serious. According to the system disclosed by the embodiment of the invention, an open system is changed into a closed drying system, so that closed drying is realized. The removal of the sludge moisture is not performed in a dehumidification mode of externally discharging humid air, but a closed circulating condensation mode is adopted, so that the air quantity and the humidity of odor treatment are greatly reduced, and the odor can be externally discharged and sent to a kiln for incineration treatment. Thoroughly solves the problem of odor pollution and greatly reduces the treatment cost and equipment investment of the odor. The brick making process and the sludge treatment system are integrated, and the high-temperature sintering section (1000 ℃) of the brick making kiln is utilized, so that the odor burning condition is provided, and the problem of odor pollution can be thoroughly solved. After the sludge is dried until the water content is about 30%, the dried sludge can be directly used as a brick making raw material for making bricks to form building material products, and the ultimate recycling of solid wastes is realized. However, the exhaust gas of the open type drying system cannot be directly sent into the kiln for burning, so that the air quantity is too large to influence the pressure in the kiln, the humidity is too large to cause the cracking of the green bricks, and the thermal efficiency of the kiln production is reduced. According to the invention, by adopting a closed drying process and configuring a condensation and dehumidification link, most of water vapor in mixed air is discharged out of the system and the mixed air is dried after the mixed air of water vapor and odor evaporated in the sludge drying process passes through the condensation and dehumidification link. The device can simply and conveniently arrange the odor monitoring instrument, so that when the odor reaches a certain concentration, the generated odor is sent into the kiln for incineration, the air quantity, the pressure and the humidity of the odor are controlled, and the normal production of the kiln is not influenced. If the condensation dehumidification link is not available, the odor is directly sent into a kiln for incineration, and the green bricks are cracked due to the large moisture content of the odor. In addition, a condensation dehumidification link (a dehumidification condensation component 122 and a drying hot gas condensation unit) is configured, so that a large-space sludge closed dehumidification drying function can be realized, and compared with a traditional open type drying process, heat loss caused by dehumidification by discharging of humid air is avoided, and the heat utilization efficiency of the system is improved; in the process of cold condensation, the water evaporated by the sludge is condensed and separated out, and the water can be directly used for brick making production and recycling, so that water resources are saved.
According to an embodiment of the present invention, in order to further improve the efficiency and effect of drying the sludge, the hypocaust unit 110 may further include a heat-conducting member, for example, a heat-conducting steel plate 113. Therefore, the heat of the hot air in the heated brick bed unit 110 can be effectively transmitted to the sludge drying unit 120 through the heat-conducting steel plate 113, and the sludge is dried in the sludge drying unit 120. The hypocaust unit 110 may have a plurality of heat conductive ribs 112 and may further have a guide groove 111. Therefore, the heat conducting ribs 132 can effectively increase the heat conducting area and adjust the air flow rate. In addition, an air shaft may be formed in the hypocaust unit 110, so that the contact area between the hot air and the heat conductive steel plate 113 may be increased, for example, the air shaft may be spirally wound in an S-shape inside the hypocaust area. Specifically, an S-shaped flue may be provided, as shown in fig. 4, and a plurality of partitions may be provided in the hypocaust unit 120, forming an S-shaped flue as shown by arrows in the drawing, including but not limited to the high temperature heat supply interface 11 and the odor exhaust port 12. The sludge in the sludge drying unit 110 is uniformly paved on the kang surface through paving equipment, the sludge is heated by the bottom flue gas to promote water evaporation, and the transparent glass greenhouse provides solar heat supplement, so that the sludge drying efficiency can be greatly improved.
The dried sludge treated by the sludge treatment zone 100 can be mixed with waste soil, coal gangue and other materials, and treated by the raw material forming zone 200 to form a wet green of a sintered product. Specifically, referring to fig. 8-12, the raw material forming zone 200 may include a wet green forming unit 210 and a wet green resting unit 220, and the formed green compact of the sintered product is then dehydrated through a drying zone 400 to form a green sintered product, which is then sent to a sintering kiln zone 300 for firing to form a brick material. Specifically, the dried sludge treated by the sludge treatment zone 100 may be supplied to the wet blank forming unit 210, and then treated by the wet blank standing unit 220 to form a wet blank of a sintered product.
Referring to fig. 8 to 12, the sintering furnace zone 300 may include a temperature raising unit 310 (or may be referred to as a high temperature fume chamber), a baking unit 320, a temperature maintaining unit 330 (or may be referred to as a temperature maintaining chamber), and a cooling unit 340 (or may be referred to as a cooling chamber), through which the sintered compact passes in sequence to form a brick. Wherein, the temperature of the baking unit 320 is higher, and the waste heat of 850-. However, the temperature of the waste heat in the region is too high to be directly used, so the waste heat can be used after being converted by devices including but not limited to a waste heat boiler and the like. Because the temperature of the area is high, the odor sent from the sludge drying unit 120 to the roasting unit 320 can be completely combusted at 1100 ℃ of 950-. Specifically, for example, the odor can be collected by the harmful gas collector 121 and discharged through the odor discharge port 12.
The heat preservation unit 330 can extract waste heat at about 900 ℃, and the waste heat is sent to the heated kang unit 110 after environmental wind is introduced for heat distribution. The hot air of the heat-preserving unit 330 is extracted from the section after the calcining unit 320, so that the residual heat of the area does not contain any harmful substance and has extremely low moisture content, thereby reducing the corrosion damage to the equipment.
Specifically, referring to fig. 6, the sintering furnace zone may have therein a kiln car 350 for accommodating a sintered compact, the kiln car 350 being movable from the side of the temperature increasing unit to the side of the cooling unit (in a first direction as shown in the drawing). The oxygen supply for firing may be in a direction opposite to the direction of kiln car movement, as shown in the second direction. The top of the kiln car at the firing unit may also have a plurality of burners 321 connected to an odor outlet (not shown) via gas lines 324. A fan may also be provided on gas line 323. Therefore, the sintering quality of the sintering kiln zone can be further improved. In addition, according to the embodiment of the invention, the top of the kiln car at the heat preservation unit and the top of the kiln car at the cooling unit can also be provided with a plurality of high-temperature heat taking ports 35, and the high-temperature heat taking ports 35 are connected with the high-temperature waste heat outlet 33. Therefore, the sintering quality of the sintering kiln zone can be further improved.
Specifically, the traveling direction of the kiln car 350 in the kiln is from temperature rise to combustion, then to high-temperature sintering, then to the heat preservation unit and the cooling unit for cooling, and the residual heat is taken away from the heat preservation unit and the cooling unit, so that the kiln car can be just used for sludge drying treatment. Because the wind direction in the kiln is from left to right, harmful gas can enter the air duct through the burner at the roasting unit, namely, the temperature is about 950 ℃, and the harmful gas is thrown into the kiln through the high-temperature burner to be sintered. And the wind direction in the furnace is the second direction, so that the harmful gas can not be diffused to the heat taking point, namely the high-temperature heat taking port 35. Harmful gas moves along the second direction along with the wind direction in the furnace, passes through 950 ℃, 1000 ℃ and 1050 ℃, and can specifically pass through a distance of 20-50 meters, so that high-temperature roasting purification is realized.
Further, since the harmful gas is introduced at the right side in fig. 6, the heat can be taken at a plurality of points in the left region of 600 to 900 ℃. And the subsequent excess heat can be taken away in a quenching mode, so that on one hand, the utilization of the excess heat can be realized, on the other hand, the temperature of the green brick is effectively reduced, and if the temperature of the heat preservation unit and the temperature of the cooling unit are too high due to the fact that the excess heat is not taken away, the green body can be deformed, or melted, or adhered. The high-temperature heat taking port 35 can be arranged 20-60 meters away from the furnace wall, so that the temperature of the furnace can be integrally reduced, the quality of the whole green brick is ensured, and meanwhile, a large amount of waste heat is stably supplied to the sludge drying treatment process. More specifically, the air can be extracted from the kiln through a plurality of groups of tube bundles, and meanwhile, the butterfly valve is arranged on the side surface of the tube bundle to control the outside natural air to enter. The more the butterfly valve is opened, the more the heat is diluted, and the butterfly valve can be controlled according to the actual temperature in the furnace. If the heat in the extracted waste heat is insufficient, the butterfly valve is closed. The extracted kiln waste heat and natural air can be conveyed to the sludge drying area by a fan.
According to an embodiment of the present invention, referring to fig. 8 to 12, the drying zone 400 may include a pre-drying unit 410 and a drying unit 420, the temperature increasing unit 310 has a hot air outlet 31 for flue gas, and the hot air outlet 31 for flue gas is connected to the drying unit 420. The temperature increasing unit 310 can extract smoke heat of 80-250 ℃ per day at 200 ℃, but the temperature increasing unit 310 is positioned at the front section of the roasting zone, so that the smoke in the region contains a large amount of harmful substances such as sulfur dioxide, dust, oxynitride and the like, and cannot be directly recycled. The smoke heat in the area can be directly sent to the drying unit 420 for drying the wet blank, the residual heat of the smoke heat after the wet blank is dried is between 35 and 55 ℃, for example, 40 ℃, and the smoke heat can be sent to the desulfurization dust remover 421 through the dry smoke outlet 42 for desulfurization dust removal treatment, and the smoke heat is discharged after reaching the standard. As described above, since the drying unit 420 is connected to the desulfurization dust collector 421, supplying the flue gas of the temperature increasing unit 310 to the drying unit 420 does not affect the effect of temperature increase and drying of the two units.
The cooling unit 340 may have a hot gas outlet 34, and the hot gas outlet 34 is connected to the predrying unit 410. The cooling unit 340 can extract the residual heat of 80-250 ℃, and similarly, the residual heat generated in the region does not contain harmful substances, so that the residual heat can be directly sent to the pre-drying unit 410 for residual heat utilization. The moisture content of the wet blank in the pre-drying unit 410 may be between 11% and 15%, for example, may be 14%. About 4% of moisture is removed from the wet blank in this section. Due to the large amount of moisture removal there will be a humidity of 50-70% in the hot air of the pre-drying unit 410, but the green bricks are not subjected to the combustion process at this time, so the air in the pre-drying unit 410 can be directly discharged. In order to further improve the resource utilization rate of the system, the predrying unit 410 may further have a condenser, and after air with humidity of 50% -70% is treated by the condenser, the generated condensed water is discharged for use. Similarly, the pre-drying unit 410 may further have a moisture outlet 41, and the moisture is supplied to the cooling unit 340 to absorb a small amount of moisture to improve the drying efficiency.
According to embodiments of the present invention, moisture that enhances the drying efficiency of the finished brick in the cooling unit 340 may have various ways, for example, air may also be blown into the cooling unit 340 by the external blower 441. The cold air may be ambient air. The amount of moisture-containing air supplied to the cooling unit 340 may be adjusted by those skilled in the art according to the actual situation.
The system provided by the embodiment of the invention can form various flexible production modes, and reasonably utilizes the waste heat in the system according to the production condition. For example, referring to fig. 8, the heat distribution unit 150 may supply the heated hot air to the sludge drying unit 120 through the heat distribution unit circulation heat distribution outlet 151, and the residual hot tail air may also be supplied to the predrying unit 410 through the heat distribution tail air outlet 152. Alternatively, referring to fig. 9, the heat distribution tail wind outlet 152 may also be connected to the heat preservation unit 330. Referring to fig. 10, the heat distribution tail wind outlet 152 may be connected to a cooling unit 340. Referring to fig. 11, the heat distribution tail air outlet 152 may be connected to a wet blank static stop unit 220 for static stop wet blank heat preservation and dehydration. Referring to fig. 12, the heat distribution tail wind outlet 152 can also discharge tail wind containing heat, and can be used for heating in winter. The hot tail air discharged from the heat distribution tail air outlet 152 can have 12 ten thousand meters3Air flow/h and a temperature of 55 ℃.
According to the embodiment of the invention, each of the gas path and the water path (such as the outlet and the inlet of the condensed water) may have a valve and a flow regulator, so that a person skilled in the art can adjust the air volume and the water volume according to different production requirements, and thus resources in the system can be better utilized. The various supply positions of the heat distribution tail air outlet 152, for example, can be realized by the opening and closing of a plurality of valves. That is, the heat distribution tail wind outlet 152 may be connected with a plurality of passages of fig. 8 to 12, and the opening and closing of each passage is controlled by a valve.
Therefore, the system can utilize the waste heat generated by each component to the great extent, reasonably extract heat and moisture, reduce the production cost of the system for treating sludge and improve the resource utilization rate.
In yet another aspect of the present invention, the present invention provides a method for treating sludge using the sludge treatment system as described above. Referring to fig. 7 and 8-12, the method includes:
s100: feeding the sludge to a sludge disposal area for drying treatment
According to an embodiment of the present invention, the water content in the sludge is reduced in this step by the sludge disposal area 100. Specifically, the sludge can be dried by using the hot air of the heated kang unit 110 located at the lower part of the sludge drying unit 120. The sludge disposal area has a closed structure. The source of the hot gas in the drying process has been described in detail above and will not be described further herein. For example, according to some embodiments of the present invention, a rapid cooling heat distributor is disposed in the heat preservation unit 330 and connected to the hot kang unit 110, the rapid cooling heat distributor can extract waste heat at 900 ℃ of 600-3The hot wind of (2) is supplied to the 110 hypocaust unit.
According to an embodiment of the present invention, hot gas may also be supplied to the sludge drying unit 120 in this step to form hot gas convection, i.e., to form gas circulation. The manner in which the gas circulation is formed has been described in detail above and will not be described in detail here. For example, in this step, a hot air circulation may be formed in the sludge drying unit 120 by the drying hot air condensing unit 140 and the heat distribution units 150, and the condensed water is discharged through the water treatment unit and may be supplied to the wet blank forming unit 210 for production.
According to the embodiment of the invention, the heated kang unit is also provided with a dehumidifying and condensing assembly. As before, owing to disposed the condensation dehumidification link in the closed mummification technology, have in the sludge drying unit promptly and take out wet condensation subassembly, make the foul smell that produces among the sludge drying process send into the kiln and burn and realize from this, do not influence the normal production of kiln and reduce the treatment cost and the equipment investment of foul smell by a wide margin: the moisture content in the odor is reduced by the dehumidifying and condensing assembly, so that the odor can be introduced into the roasting unit for treatment without influencing the brick making quality. And the dehumidifying and condensing assembly can also extract the waste heat in the moisture and separate out condensed water, thereby being beneficial to improving the resource utilization rate of the method.
The tail wind containing heat after being distributed by the heat distribution unit 150 can be supplied to the sludge drying unit 120 through the circulating heat distribution outlet 151 of the heat distribution unit to form hot air circulation, and the residual tail wind containing heat can be discharged from the heat distribution tail wind outlet 152, and fig. 8-12 show various supply modes of the heat distribution tail wind outlet 152.
The odor generated from the sludge drying unit 120 may be supplied to the firing unit 320 in the sintering kiln zone 300 for combustion. In the step, the sludge is dried by using hot gas with lower temperature, and the sludge drying can be assisted by gas circulation, so that the generated odor has lower content of toxic and harmful substances and can be directly supplied to the roasting unit 120 for combustion treatment.
S200: the sludge after the drying treatment is supplied to a raw material forming area to form a wet blank of a sintered product
In this step, the dried sludge may be utilized to form a green sinter in accordance with embodiments of the present invention. The specific process for forming the green compact of the sintered product is not particularly limited and may be selected by those skilled in the art according to the actual circumstances. For example, the pug can be automatically and quantitatively fed through a feeding machine, mixed by a double-roller machine, reduced in discharged particle size, mixed with coal gangue, added with hot water generated by a waste heat boiler, stirred and then conveyed to an aging warehouse, so that the pug is in a plastic state. The mass proportion of the dried sludge in the raw materials can be not higher than 8%. And then, the green compact of the sintering product is formed through a series of unattended and automatic operation processes, and then the green compact is stacked on a kiln car by using an automatic green compact stacking robot to be supplied to the next process.
S300: feeding the wet sintered product blank to a drying area so as to dehydrate the wet sintered product blank to form a green sintered product blank
In this step, the green sintered product is dried in a drying zone 400 to be dehydrated to form a green sintered product, according to an embodiment of the present invention. Specifically, the sintered compact may be dried sequentially through the predrying unit 410 and the drying unit 420. The dried sintered blank after moisture removal can be smoothly sent to the next procedure at uniform speed by equipment such as a hydraulic pusher.
According to an embodiment of the present invention, the drying zone 400 may include a pre-drying unit 410 and a drying unit 420, in which the flue gas generated by the temperature increasing unit 310 of the sintering kiln zone 300 may be supplied to the drying unit 420 for use, while using the residual heat in the flue gas, and the dry flue gas generated by the drying unit 420 is supplied to the desulfurization dust collector 421 for desulfurization treatment. Since the moisture content of the green compact of the sintered product in the pre-drying unit 410 is large, moisture in the pre-drying unit 410 can be supplied to the cooling unit 340, so that the finished brick of the cooling unit 340 can be dried with a small amount of moisture absorption. As previously described, recycling of gas may occur between the cooling unit 340 and the pre-drying unit 410.
S400: supplying the sintered compact to a sintering kiln zone for subjecting the sintered compact to a firing process to form a brick material
According to an embodiment of the invention, the sintered compact is fed to a brickmaking kiln in this step, so that the sintered compact is subjected to a firing treatment to form a brick material. Specifically, the method can be used for high-temperature calcination in a kiln, so that the porosity of a blank is reduced, the volume is shrunk, the strength is increased, and the blank becomes dense. The treatment process in the individual units of the sintering furnace zone and the utilization of the residual heat of each unit have been described in detail above and will not be described in detail here.
Therefore, the method can reasonably utilize the waste heat generated in each step and the moisture contained in the gas, thereby reducing the production cost of the method. The method utilizes the system to treat the sludge, so the method can also have the process which can be realized by the structural components in each area and unit in the system, and the details are not repeated.
The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
Example 1
The sludge system configuration is shown in fig. 8. The sludge is sludge of a sewage treatment plant, and the water content is 80 percent. The temperature of the water supplied from the high-temperature heat supply interface 11 to the sludge drying unit is about 200 ℃, and the water content is 6.9g/m3The air volume of the left and right mixed gases is 18 ten thousand per hour (the temperature preservation unit 330 extracts 900℃)Excess heat and ambient wind). The moisture content of the dried sludge is reduced to about 40 percent, the temperature is about 85 ℃, the odor of the sludge drying unit can be supplied to the roasting unit at 60 ℃ with 1 ten thousand air volume/h, and the roasting is carried out at 850-1050 ℃.
The condensing unit can condense about 8 tons/h of condensed water, and the condensed water meets the recycling requirement after being treated. The heat distribution unit 150 receives 14 km of the hot floor unit 1103H, about 90 ℃ hot kang tail heat, and a condensation unit of 10 ten thousand meters3Cool air at 40 ℃ or so at a temperature of about 11 ten thousand meters can be supplied to the sludge drying unit after heat distribution3The mixed hot air at about 60 ℃ per hour is discharged by 12 ten thousand meters3H, residual heat of about 55 ℃.
The predrying unit may discharge about 10 ten thousand meters to the cooling unit3Moisture at 40 deg.C or so at/h, the cooling unit can supply 14 ten thousand meters to the pre-drying unit3And/h, residual heat at about 100 ℃.
The drying unit 420 can achieve 9% of smoke heat dehydration, and the exhaust gas supplied to the desulfurizer is at 40 ℃ and 17 ten thousand of air volume. The drying unit may discharge about 34.8 tons/h of wet green containing 1% water to the warming unit, and the warming unit may supply 18 km to the drying unit3And/h, smoke heat of about 200 ℃.
The embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (14)

1. A sludge treatment system, comprising:
the system comprises a sludge disposal area, a heating kang unit and a moisture absorption and condensation component, wherein the sludge disposal area is provided with a sludge drying unit and the heating kang unit which is positioned at the lower part of the sludge drying unit;
the raw material forming area is connected with the sludge disposal area so as to prepare a wet sintered product blank from a raw material mixed with the dried sludge treated by the sludge disposal area;
the drying area is connected with the raw material forming area and is used for dehydrating the wet sintered product blank to form a sintered product blank; and
the sintering kiln zone is connected with the drying zone and is used for roasting the sintered product blank to form brick materials, the sintering kiln zone is provided with a heating unit, a roasting unit, a heat preservation unit and a cooling unit which are sequentially connected, the drying zone is connected with the heating unit,
wherein, the heated kang unit has high temperature heat supply interface, the sludge drying unit has the foul smell row mouth, the unit that keeps warm has the export of high temperature waste heat, the drying district has the export of damp of arranging, the export of damp of arranging with the cooling unit links to each other, the foul smell row mouth with the calcination unit links to each other, the export of high temperature waste heat with the high temperature heat supply interface links to each other.
2. The sludge treatment system of claim 1 further comprising a drying hot gas condensing unit and a heat distribution unit,
the heat distribution unit is connected with the heated kang unit,
the drying hot gas condensing unit is provided with a moisture-discharging hot gas inlet, a condensed gas outlet and a condensed water outlet, the moisture-discharging hot gas inlet is connected with the dehumidifying condensing assembly, the condensed gas outlet is connected with the heat distribution unit, and the condensed water outlet is connected with the raw material forming area.
3. The sludge treatment system of claim 2, wherein the sludge drying unit further comprises a heat distribution unit circulating heat distribution inlet and a condensed gas inlet, the condensed gas inlet is connected with the condensed gas outlet of the drying hot gas condensing unit, and the heat distribution unit circulating heat distribution inlet is connected with the heat distribution unit and is positioned at the opposite side of the condensed gas inlet.
4. The sludge treatment system of claim 2, wherein the heat distribution unit further comprises a heat distribution tail air outlet connected to the pre-drying unit of the drying zone;
or the heat distribution tail air outlet is connected with the heat preservation unit;
or the heat distribution tail air outlet is connected with the cooling unit;
or the heat distribution tail air outlet is connected with the wet blank static stop unit of the raw material forming area.
5. The sludge treatment system of claim 1, wherein the heated brick bed unit further comprises at least two hot air convection outlets, and the sludge drying unit further comprises two oppositely disposed hot air convection inlets connected to the hot air convection outlets.
6. The sludge treatment system of any one of claims 1 to 5, wherein the heated brick bed unit has at least one of the following configurations:
the heat conduction steel plate is positioned on one side, close to the sludge drying unit, in the heated kang unit;
the heat conduction rib is positioned on one side, far away from the sludge drying unit, of the heat conduction steel plate;
the vent hole penetrates through the heat conduction steel plate and is communicated with the heated kang unit and the sludge drying unit;
the top of one side of the sludge drying unit, which is far away from the heated kang unit, is of a glass structure;
the hot kang unit is provided with an S-shaped flue;
optionally, the air vent is connected with a nozzle, and the nozzle is located in the sludge drying unit and arranged on two sides of the sludge containing area.
7. The sludge treatment system of claim 6, wherein the dehumidifying condensation assembly includes a moisture drain conduit disposed above the sludge containment area.
8. The sludge treatment system of any one of claims 1 to 5, wherein a kiln car for accommodating a sintered product blank is arranged in the sintering kiln area, the kiln car can move from one side of the heating unit to one side of the cooling unit, a plurality of burners are arranged on the top of the kiln car at the roasting unit, the burners are connected with the odor discharge port through a gas pipeline, and a fan is arranged on the gas pipeline;
optionally, a plurality of high-temperature heat taking ports are formed in the top of the kiln car at the heat preservation unit and the cooling unit, and the high-temperature heat taking ports are connected with the high-temperature waste heat outlet.
9. The sludge treatment system of claim 1, wherein the temperature raising unit has a hot flue gas outlet connected to the drying zone; the cooling unit has a hot gas outlet connected to the drying zone.
10. The sludge treatment system of claim 9, wherein the drying zone comprises a pre-drying unit and a drying unit, the hot flue gas outlet is connected to the drying unit, the drying unit further comprises a tail flue gas moisture outlet, and the tail flue gas moisture outlet is connected to a desulfurization dust remover;
the hot gas outlet with the unit links to each other futilely in advance, the condenser has in the unit of doing in advance, the moisture discharge export with the condenser links to each other, the unit of doing in advance have with the outlet that the condenser links to each other.
11. A method for treating sludge using the sludge treatment system of any one of claims 1 to 10, comprising:
supplying sludge to a sludge disposal area so as to carry out drying treatment on the sludge by utilizing hot air of a heated kang unit positioned at the lower part of the sludge drying unit;
supplying the sludge subjected to the drying treatment to a raw material forming area to form a wet sintered product blank;
supplying the wet sintered product blank to a drying area so as to dehydrate the wet sintered product blank to form a green sintered product blank; and
feeding the green compact to a sintering kiln zone for subjecting the green compact to a firing process to form a brick material,
the drying treatment of the sludge comprises the steps that hot air in a heat preservation unit in a sintering kiln area is supplied to a heated brick bed unit to serve as the hot air, wet air generated in a drying area is supplied to a cooling unit in the sintering kiln area, and odor generated by the sludge drying unit is supplied to a roasting unit in the sintering kiln area to be combusted.
12. The method of claim 11, further comprising:
and hot gas convection is formed in the sludge drying unit.
13. The method of claim 11, wherein the sludge treatment system further comprises a drying hot gas condensing unit and a heat distribution unit, the method further comprising: and supplying heated kang tail gas generated by the heated kang unit to the heat distribution unit, supplying moisture-discharging hot gas generated by the sludge drying unit to the drying hot gas condensing unit for condensation treatment, and supplying obtained cold air to the heat distribution unit for carrying out heat distribution on the sludge drying unit of the sludge drying unit.
14. The method of claim 11, wherein the drying zone comprises a pre-drying unit and a drying unit, the method further comprising:
supplying moisture generated by the pre-drying unit to a cooling unit in the sintering kiln region, and supplying residual heat generated by the cooling unit to the pre-drying unit;
and supplying the flue gas generated by the temperature rising unit of the sintering kiln zone to the drying unit, supplying tail flue gas moisture generated by the drying unit to a desulfurization dust remover for desulfurization treatment, and supplying hot air containing the flue gas generated by the temperature rising unit to the drying unit sludge drying unit.
CN202010992192.4A 2020-09-21 2020-09-21 Sludge treatment and building material resource utilization system and process Pending CN112028448A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113352450A (en) * 2021-03-25 2021-09-07 清华大学 Sludge treatment system and sludge treatment method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113352450A (en) * 2021-03-25 2021-09-07 清华大学 Sludge treatment system and sludge treatment method
CN113352450B (en) * 2021-03-25 2022-05-27 清华大学 Sludge treatment system and sludge treatment method

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