CN109851200B - Sludge back-mixing treatment system and method - Google Patents
Sludge back-mixing treatment system and method Download PDFInfo
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- CN109851200B CN109851200B CN201910119730.6A CN201910119730A CN109851200B CN 109851200 B CN109851200 B CN 109851200B CN 201910119730 A CN201910119730 A CN 201910119730A CN 109851200 B CN109851200 B CN 109851200B
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- 238000007599 discharging Methods 0.000 claims abstract description 66
- 238000003763 carbonization Methods 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000010000 carbonizing Methods 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 89
- 239000000203 mixture Substances 0.000 claims description 64
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- 238000002485 combustion reaction Methods 0.000 claims description 42
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 37
- 239000003546 flue gas Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 22
- 238000004378 air conditioning Methods 0.000 claims description 21
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- 238000004064 recycling Methods 0.000 claims description 8
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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Abstract
The invention relates to a sludge back-mixing treatment system and a method, wherein the system comprises a back-mixing unit, a drying unit and a carbonization unit which are sequentially arranged; the back mixing unit comprises a mixing device; a stirring device is arranged in the mixing device; the drying unit comprises a dryer, a first feeding device fixed at one end of the dryer and a first discharging device fixed at one end, far away from the first feeding device, of the dryer; the dryer comprises a first inner cylinder and a first outer cylinder; the first feeding device and the first discharging device are both communicated with the first inner cylinder; the carbonization unit comprises a carbonization machine, a second feeding device fixed at one end of the carbonization machine and a second discharging device fixed at one end of the carbonization machine far away from the second feeding device; the carbonizing machine comprises a second inner cylinder and a second outer cylinder; the second feeding device and the second discharging device are communicated with the second inner cylinder.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge back-mixing treatment system and a sludge back-mixing treatment method.
Background
With the rapid development of economy and the acceleration of urbanization process in China, the sewage treatment amount is increasing day by day. The production of sludge, which is an end product of sewage treatment, has also increased year by year. The problem with this is that the pressure for sludge disposal is increasing. The main properties of the sludge are: (1) the organic matter content is high, and the rottenness and the odor are easy to generate; (2) the content of toxic and harmful pollutants in the sludge is high; (3) the water content is high, the structure is in a cementing structure, and the dehydration is not easy; (4) contains more plant nutrients; (5) contains pathogenic bacteria and parasite eggs. If the sludge cannot be reasonably and properly treated, secondary pollution is easily caused.
Now, the disposal purposes of sludge include: reduction, harmlessness, stabilization, recycling and the like. The treatment method mainly comprises the following steps: landfill, incineration, anaerobic digestion, biological composting, sludge digestion, drying carbonization and the like. Wherein, the technical advantages of adopting the drying and carbonizing technology to treat the sludge comprise: (1) the thermal efficiency is high, and hot-blast can directly and indirectly contact mud, realizes dual mummification. The generated hot flue gas can be recycled; (2) the tail gas emission is clean, and the dry distillation gas generated by sludge carbonization returns to the heating unit, so that the resource utilization and the harmlessness are realized; (3) the reduction advantage is obvious, and the volume of the sludge can be greatly reduced after carbonization treatment; (4) the social comprehensive benefits are high.
However, when the sludge is dried, a stage with high adhesiveness occurs, and the water content of the sludge at this stage is 55% to 65%. At this time, the sludge is very easy to adhere to the inner wall of the drying equipment and further agglomerate, so that the surface of the sludge is hard, and the inside of the sludge is still thin sludge. The sludge with the water content of 55-65% causes the phenomenon of 'shaft sticking' due to the adhesiveness of the sludge. On the one hand, this affects the continuous advancement of sludge drying; on the other hand, the device is easy to be blocked, and the internal structure of the device is damaged. Moreover, for sludge adhered to dead corners of the equipment, after the sludge is dried and reaches the ignition point of the sludge, the sludge may cause explosion danger.
At present, the treatment efficiency of sludge is low, and the actual production requirement cannot be met.
Disclosure of Invention
The invention provides a sludge back-mixing treatment system and method, aiming at solving the problems that the treatment efficiency of sludge is low and the actual production requirement cannot be met.
The sludge back-mixing treatment system comprises a back-mixing unit, a drying unit and a carbonization unit which are sequentially arranged;
the back mixing unit comprises a mixing device with a hollow structure; a stirring device is arranged in the mixing device; the top of the mixing device is provided with a sludge inlet and a dry material inlet, and the bottom of the mixing device is provided with a first mixture outlet;
the drying unit comprises a dryer, a first feeding device fixed at one end of the dryer and a first discharging device fixed at one end, far away from the first feeding device, of the dryer;
the top of the first feeding device is provided with a first mixture inlet; communicating the mixing device and the first feeding device through the first mixture inlet and the first mixture outlet;
a second mixture outlet is formed in the bottom of the first discharging device;
the dryer comprises a first inner cylinder and a first outer cylinder; the first inner cylinder penetrates through the first outer cylinder, and the first inner cylinder is movably connected with the first outer cylinder; a first pushing rod penetrates through the inner part of the first inner cylinder along the axial direction of the first inner cylinder; the first feeding device and the first discharging device are both communicated with the first inner cylinder;
the carbonization unit comprises a carbonization machine, a second feeding device fixed at one end of the carbonization machine and a second discharging device fixed at one end of the carbonization machine far away from the second feeding device;
the top of the second feeding device is provided with a second mixture inlet; communicating the first discharging means and the second feeding means through the second mixture inlet and the second mixture outlet;
a third mixture outlet is formed in the bottom of the second discharging device;
the carbonizing machine comprises a second inner cylinder and a second outer cylinder; the second inner cylinder is arranged in the second outer cylinder in a penetrating way, and the second inner cylinder is movably connected with the second outer cylinder; a second pushing rod penetrates through the second inner cylinder along the axial direction of the second inner cylinder; the second feeding device and the second discharging device are both communicated with the second inner cylinder;
a star-structured feeding valve is fixed at the top of the second mixture inlet; and a discharge valve in a star-shaped structure is arranged at the bottom of the third mixture outlet.
In one embodiment, the outer wall of the first inner cylinder is rotatably connected with the inner wall of the first outer cylinder; the first inner cylinder can rotate around the axial direction of the first outer cylinder;
the outer wall of the second inner barrel is rotationally connected with the inner wall of the second outer barrel; the second inner cylinder can rotate around the axial direction of the second outer cylinder.
In one embodiment, the system further comprises a heating unit; the heating unit comprises a first combustion chamber, a first air conditioning chamber communicated with the first combustion chamber, a second combustion chamber and a second air conditioning chamber communicated with the second combustion chamber; a valve is arranged between the first combustion chamber and the second combustion chamber; the first combustion chamber and the second combustion chamber can be communicated by controlling the valve;
the first air regulating chamber is provided with a first hot flue gas outlet; the top of one side of the first outer cylinder, which is close to the first discharging device, is provided with a first hot flue gas inlet; the first air adjusting chamber is communicated with the first outer cylinder through the first hot flue gas outlet and the first hot flue gas inlet;
the second air regulating chamber is provided with a second hot flue gas outlet; the top of one side, close to the second discharging device, of the second outer cylinder is provided with a second hot flue gas inlet; the second air adjusting chamber is communicated with the second outer cylinder through the second hot flue gas outlet and the second hot flue gas inlet;
the first combustion chamber is also provided with a first heat source inlet; the second combustion chamber is also provided with a second heat source inlet;
the first air conditioning chamber is also provided with a first secondary air inlet; the second air conditioning chamber is also provided with a second secondary air inlet.
In one embodiment, the system further comprises a retort gas treatment unit;
the dry distillation gas treatment unit comprises a dry distillation gas processor; the dry distillation gas processor is provided with a first dry distillation gas inlet; the top of the second discharging device is provided with a first dry distillation gas outlet; the dry distillation gas processor and the second discharging device are communicated through the first dry distillation gas inlet and the first dry distillation gas outlet.
In one embodiment, the dry distillation gas processor is further provided with a second dry distillation gas outlet; the second combustion chamber is provided with a second dry distillation gas inlet; the second carbonization gas outlet and the second carbonization gas inlet are communicated with the carbonization gas processor and the second combustion chamber.
In one specific embodiment, a first return air outlet is formed in the top of one side, away from the second discharging device, of the second outer cylinder; the bottom of one side of the first outer cylinder, which is close to the first discharging device, is provided with a first return air inlet; the first outer cylinder and the second outer cylinder are communicated through the first return air outlet and the first return air inlet;
a second recycled air outlet is formed in the top of one side, away from the first discharging device, of the first outer cylinder; a second recycled air inlet is formed in one side, away from the first outer barrel, of the first feeding device; the first outer cylinder and the first feeding device are communicated through the second recycled air outlet and the second recycled air inlet.
In one embodiment, the system further comprises a tail gas treatment unit;
the tail gas treatment unit comprises a tail gas processor; one end of the tail gas processor is provided with a tail gas inlet, and the other end of the tail gas processor is provided with a tail gas outlet; a third recycled air outlet is formed in the top of the first discharging device; and the first discharging device is communicated with the tail gas processor through the third recycling air outlet and the tail gas inlet.
Correspondingly, based on the same invention concept, the invention also provides a sludge back-mixing treatment method, which comprises the steps of premixing sludge and dry materials;
drying the premixed product;
and carbonizing the product after the drying treatment.
In one embodiment, the pre-mixing the sludge and the dry materials comprises:
and premixing the sludge and the dry materials according to the mass ratio of 1-1.5.
The invention has the beneficial effects that: according to the system, the back mixing unit is arranged, the water content of the sludge can be adjusted by using the mixing device and the stirring device, so that the phenomenon of shaft sticking of the sludge is effectively avoided, and the treatment efficiency of the sludge is improved. In addition, different dry materials are added into the mixing device, so that the sludge can finally form a directional product, and the recycling of sludge treatment is realized.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a sludge back-mixing treatment system according to the present invention;
FIG. 2 is a schematic diagram of the structure of a back mixing unit in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a drying unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the structure of a carbonization unit according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another embodiment of a sludge back-mixing treatment system according to the present invention;
FIG. 6 is a flow chart of a method for treating sludge back-mixing according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description or for simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 4, as an embodiment of a sludge back-mixing treatment system according to the present invention, the system includes a back-mixing unit 110, a drying unit 120, and a carbonizing unit 130, which are sequentially disposed. The back mixing unit 110 includes a mixing device 111 having a hollow structure, and a stirring device 112 is provided inside the mixing device 111. The mixing device 111 is provided with a sludge inlet 1111 and a dry material inlet 1112 at the top and a first mixture outlet 1113 at the bottom. The drying unit 120 includes a dryer 121, a first feeding device 122 fixed to an end of the dryer 121, and a first discharging device 123 fixed to an end of the dryer 121 remote from the first feeding device 122. The first feeding device 122 is provided at the top with a first mixture inlet 1221, and the mixing device 111 and the first feeding device 122 are communicated through the first mixture inlet 1221 and the first mixture outlet 1113. The bottom of the first discharging device 123 is provided with a second mixture outlet 1232. The dryer 121 includes a first inner cylinder 1212 and a first outer cylinder 1211, wherein the first inner cylinder 1212 is inserted into the first outer cylinder 1211, and the first inner cylinder 1212 is movably connected to the first outer cylinder 1211. A first push rod 1213 is provided inside the first inner cylinder 1212 in the axial direction of the first inner cylinder 1212. The first feeding device 122 and the first discharging device 123 are both communicated with the first inner barrel 1212. The carbonizing unit 130 includes a carbonizing machine 131, a second feeding device 132 fixed to an end of the carbonizing machine 131, and a second discharging device 133 fixed to an end of the carbonizing machine 131 remote from the second feeding device 132. The second feeding device 132 is provided with a second mixture inlet 1321 at the top, and the first discharging device 123 and the second feeding device 132 are communicated through the second mixture inlet 1321 and a second mixture outlet 1232. The bottom of the second discharging device 133 is provided with a third mixture outlet 1332. The carbonizer 131 includes a second inner cylinder 1312 and a second outer cylinder 1311, the second inner cylinder 1312 is inserted into the second outer cylinder 1311, and the second inner cylinder 1312 and the second outer cylinder 1311 are movably connected to each other. A second push rod 1313 is inserted into the second inner tube 1312 in the axial direction of the second inner tube 1312. The second feeding device 132 and the second discharging device 133 are both communicated with the second inner cylinder 1312. A star-structured feed valve is fixed at the top of the second mixture inlet 1321, and a star-structured discharge valve is arranged at the bottom of the third mixture outlet 1332.
In this embodiment, the sludge with a water content of 55% to 65% can enter the mixing device 111 through the sludge inlet 1111, and the dry material with a water content of 10% to 35% can enter the mixing device 111 through the dry material inlet 1112. The mixing device 111 is provided with a stirring device 112 inside, and the sludge with the water content of 55% -65% and the dry material with the water content of 10% -35% are stirred to be uniformly mixed to form a mixture with the water content of 35% -37%. When the mixture passes through the drying unit 120, the mixture can effectively avoid the phenomenon of 'shaft sticking', thereby improving the treatment efficiency of the sludge. Wherein, the dry material can be sludge processed by the drying unit 120, or biochar formed by processing by the carbonization unit, or broken plant straws, etc. According to the requirements of final products, specific dry materials are selected, so that the sludge can form directional products, and the recycling of sludge treatment is realized. The drying unit 120 includes a dryer 121, a first feeding device 122, and a first discharging device 123. The dryer 121 includes a first inner cylinder 1212 and a first outer cylinder 1211, and the first feeding device 122 and the first discharging device 123 are both communicated with the first inner cylinder 1212. The mixture with the water content of 35% -37% enters a dryer 121 through a first feeding device 122, the dryer 121 processes the mixture to form a mixture with the water content of 15% -25%, and the mixture is output through a first discharging device 123. A first pushing rod 1213 is disposed inside the first inner cylinder 1212 along the axial direction of the first inner cylinder 1212. The mixture moves inside the first inner cylinder 1212 by being pushed by the first push rod 1213. The mixture with the water content of 35% -37% flows through the mixing device 111 to the first feeding device 122 through the first mixture outlet 1113 and the first mixture inlet 1221. The carbonizing unit 130 includes a carbonizing machine 131, a second feeding device 132, and a second discharging device 133. The carbonizer 131 comprises a second inner cylinder 1312 and a second outer cylinder 1311, and the second feeding device 132 and the second discharging device 133 are both communicated with the second inner cylinder 1312. The mixture with the water content of 15% -25% flows through the first discharging device 123 and the second feeding device 132 and enters the carbonizing machine 131. Wherein, the bottom of the first discharging device 123 is provided with a second mixture outlet 1232, and the top of the second feeding device 132 is provided with a second mixture inlet 1321. The mixture having a water content of 15% to 25% is input from the first discharging device 123 to the second feeding device 132 through the second mixture outlet 1232 and the second mixture inlet 1321. The bottom of the second discharging device 133 is provided with a third mixture outlet 1332. The mixture is treated by the carbonizer 131 to produce biochar, which is output from the interior of the second discharging device 133 through a third mixture outlet 1332. A second push rod 1313 is inserted into the second inner cylinder 1312 in the axial direction of the second inner cylinder 1312. The mixture moves inside the second inner tube 1312 by being pushed by the second push rod 1313. A star-structured feed valve is fixed to the top of the second mixture inlet 1321, and the feed rate can be controlled by controlling the rotational frequency of the feed valve. The bottom of the third mixture outlet 1332 is also provided with a star-structured discharge valve, and the discharge rate can be controlled by controlling the rotation frequency of the discharge valve.
Referring to fig. 3 and 4, an outer wall of the first inner cylinder 1212 is rotatably connected to an inner wall of the first outer cylinder 1211, and the first inner cylinder 1212 is rotatable about an axial direction of the first outer cylinder 1211. The outer wall of the second inner tube 1312 is rotatably connected to the inner wall of the second outer tube 1311, and the second inner tube 1312 is capable of rotating around the axial direction of the second outer tube 1311. In this manner, the first outer cylinder 1211 remains stationary and the first inner cylinder 1212 rotates, so that the mixture is turned inside the dryer 121. The second outer cylinder 1311 is kept stationary and the second inner cylinder 1312 is rotated so that the mixture is turned inside the carbonizer 131.
Referring to fig. 1, the system further includes a heating unit 140, and the heating unit 140 includes a first combustion chamber 141, a first air conditioning chamber 142 communicating with the first combustion chamber 141, a second combustion chamber 143, and a second air conditioning chamber 144 communicating with the second combustion chamber 143. A valve is provided between the first combustion chamber 141 and the second combustion chamber 143, and the first combustion chamber 141 and the second combustion chamber 143 can be communicated with each other by controlling the valve. When the thermal energy in the second combustion chamber 143 is large, the thermal energy can be supplemented to the first combustion chamber 141.
The first air conditioning chamber 142 is provided with a first hot flue gas outlet, the top of the first outer cylinder 1211 on the side close to the first discharging device 122 is provided with a first hot flue gas inlet 12111, and the first air conditioning chamber 142 and the first outer cylinder 1211 are communicated through the first hot flue gas outlet and the first hot flue gas inlet 12111. In this way, the hot flue gas with a temperature of 300 to 500 ℃ is pushed between the first outer barrel 1211 and the first inner barrel 1212 of the dryer 121 through the first air conditioning chamber 142, and indirectly heats the mixture inside the first inner barrel 1212.
Wherein, the second air conditioning chamber 144 is provided with a second hot flue gas outlet, the top of one side of the second outer barrel 1311 close to the second discharging device 132 is provided with a second hot flue gas inlet 13111, and the second air conditioning chamber 144 and the second outer barrel 1311 are communicated through the second hot flue gas outlet and the second hot flue gas inlet 13111. In this way, the hot flue gas with the temperature of 750-800 ℃ is pushed between the second inner cylinder 1312 and the second outer cylinder 1311 of the carbonizing machine 131 through the second air conditioning chamber 142, and the mixture in the second inner cylinder 1312 is indirectly heated.
The first combustion chamber 141 is further provided with a first heat source inlet through which a heat source is added to the first combustion chamber 141. The second combustion chamber 143 is also provided with a second heat source inlet. A heat source is added to the second combustion chamber 143 through a second heat source inlet. The heat source includes: biomass, dry distillation gas, kerosene, and the like. The first air conditioning chamber 142 is further provided with a first secondary air inlet, and the first secondary air inlet is connected with a fan so as to blow an air source into the first air conditioning chamber 142. The second air conditioning chamber 144 is further provided with a second secondary air inlet, and the second secondary air inlet is connected with a fan so as to blow an air source into the second air conditioning chamber 144.
Referring to fig. 1 and 4, the system further includes a dry distillation gas treatment unit 150, and the dry distillation gas treatment unit 150 includes a dry distillation gas processor. The dry distillation gas processor is provided with a first dry distillation gas inlet, the top of the second discharging device 133 is provided with a first dry distillation gas outlet 1331, and the dry distillation gas processor and the second discharging device 133 are communicated through the first dry distillation gas inlet and the first dry distillation gas outlet 1331. The mixture is processed by the carbonizer 131, and a dry distillation gas is also formed. The dry distillation gas enters the dry distillation gas processor through a second discharging device 133. The dry distillation gas processor can remove dust, cool and remove acid gas mixed in the dry distillation gas. The dry distillation gas processor is also provided with a second dry distillation gas outlet, the second combustion chamber 143 is provided with a second dry distillation gas inlet, and the dry distillation gas processor and the second combustion chamber 143 are communicated through the second dry distillation gas outlet and the second dry distillation gas inlet. Therefore, the retorting gas treated by the retorting gas processor can be used as a heat source of the second combustion chamber 143 to enter the second combustion chamber 143, and the utilization rate of resources is effectively improved.
Referring to fig. 1, 3 and 4, a first return air outlet 13111 is provided at the top of a side of the second outer cylinder 1311 away from the second discharging device 133, a first return air inlet 12113 is provided at the bottom of a side of the first outer cylinder 1211 close to the first discharging device 123, and the first outer cylinder 1211 and the second outer cylinder 1311 are communicated through the first return air outlet 13111 and the first return air inlet 12113. Therefore, the hot flue gas with the temperature of 750-800 ℃ is abutted between the second inner cylinder 1312 and the second outer cylinder 1311 of the carbonizing machine 131, the temperature of the hot flue gas is controlled to be 300-350 ℃ after the mixture in the second inner cylinder 1312 is indirectly heated, and then the hot flue gas is abutted between the first outer cylinder 1211 and the first inner cylinder 1212 of the drying machine 121 through the first recycled air outlet 13111 and the first recycled air inlet 12113 to be used as supplementary heat energy to indirectly heat the mixture in the first inner cylinder 1212, so that the coupling and integration of energy are realized, the utilization rate of the heat energy is improved, and the cost is effectively saved. In addition, a second recycled air outlet 12111 is arranged at the top of the side of the first outer cylinder 1211 far away from the first discharging device 123, a second recycled air inlet 1222 is arranged at the side of the first feeding device 122 far away from the first outer cylinder 1211, and the first outer cylinder 1211 and the first feeding device 122 are communicated through the second recycled air outlet 12111 and the second recycled air inlet 1222. Therefore, hot flue gas between the first outer cylinder 1211 and the first inner cylinder 1212 can enter the first inner cylinder 1212 through the first feeding device 122, and can directly contact a mixture in the first inner cylinder 1212, so that direct heating is realized, and the drying efficiency is greatly improved.
Referring to fig. 3 and 5, the system further includes a tail gas treatment unit 160, and the tail gas treatment unit 160 includes a tail gas processor. One end of the tail gas processor is provided with a tail gas inlet, and the other end of the tail gas processor is provided with a tail gas outlet. The top of the first discharging device 123 is provided with a third recycling air outlet 1231, and the first discharging device 123 and the tail gas processor are communicated through the third recycling air outlet 1231 and the tail gas inlet. The hot flue gas flows through the first inner cylinder 1212 and enters the first discharging device 123, the temperature of the hot flue gas is controlled to be 120-150 ℃, and then the hot flue gas is used as tail gas and enters the tail gas processor through the third recycling air outlet 1231 and the tail gas inlet. The tail gas processor is used for cooling, dedusting, removing chemical impurities and the like of the tail gas and then discharging the tail gas.
In other embodiments, the hot flue gas flows through the first inner cylinder 1212 and enters the first discharging device 123, and after the temperature of the hot flue gas is controlled to be 120 to 150 ℃, the hot flue gas enters the first air conditioning chamber 142 as recycled air through the third recycled air outlet 1231, and is utilized in the first air conditioning chamber 142.
Referring to fig. 6, as an embodiment of the sludge back-mixing treatment method according to the present invention, the method includes premixing S1000 sludge and dry materials, drying S2000 the premixed product, and carbonizing S3000 the dried product.
Specifically, the sludge and the dry materials are premixed S1000, namely the sludge with the water content of 55% -65% and the dry materials with the water content of 10% -35% are turned, stirred and ventilated for feeding, so that the sludge and the dry materials are fully and uniformly mixed. And the step S2000 of drying the premixed product is to continuously dry the premixed product at 200 ℃, wherein the treatment time is 0.5-1 hour. Thereby reducing the water content of the product after the premixing to 20%. The carbonization treatment S3000 of the product after the drying treatment is performed by continuously heating the product after the drying treatment for 30 minutes using a high temperature of 800 ℃ under atmospheric pressure and anaerobic conditions.
In a specific embodiment of the invention, the step of premixing S1000 the sludge and the dry materials comprises the step of premixing the sludge and the dry materials according to a mass ratio of 1-1.5. When the dry material is the biochar, premixing sludge with the water content of 60% and the biochar with the water content of 10% according to the mass ratio of 1. When the dry material is corn straws, the sludge with the water content of 60 percent and the corn straws with the water content of 11 percent are premixed according to the mass ratio of 1.5.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples" or the like means 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, a schematic representation of the term does not necessarily 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.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the equivalent or modified in the scope of the present invention and the technical solution and the idea thereof in the present invention.
Claims (6)
1. A sludge back-mixing treatment system is characterized by comprising:
the back mixing unit, the drying unit and the carbonization unit are arranged in sequence;
the back mixing unit comprises a mixing device with a hollow structure; a stirring device is arranged in the mixing device; the top of the mixing device is provided with a sludge inlet and a dry material inlet, and the bottom of the mixing device is provided with a first mixture outlet;
the drying unit comprises a dryer, a first feeding device fixed at one end of the dryer and a first discharging device fixed at one end, far away from the first feeding device, of the dryer;
the top of the first feeding device is provided with a first mixture inlet; communicating the mixing device and the first feeding device through the first mixture inlet and the first mixture outlet;
a second mixture outlet is formed in the bottom of the first discharging device;
the dryer comprises a first inner cylinder and a first outer cylinder; the first inner cylinder penetrates through the first outer cylinder, and the first inner cylinder is movably connected with the first outer cylinder; a first pushing rod penetrates through the inner part of the first inner cylinder along the axial direction of the first inner cylinder; the first feeding device and the first discharging device are communicated with the first inner cylinder;
the carbonization unit comprises a carbonization machine, a second feeding device fixed at one end of the carbonization machine and a second discharging device fixed at one end of the carbonization machine far away from the second feeding device;
the top of the second feeding device is provided with a second mixture inlet; communicating the first discharging means and the second feeding means through the second mixture inlet and the second mixture outlet;
a third mixture outlet is formed in the bottom of the second discharging device;
the carbonizing machine comprises a second inner cylinder and a second outer cylinder; the second inner cylinder is arranged in the second outer cylinder in a penetrating way, and the second inner cylinder is movably connected with the second outer cylinder; a second pushing rod penetrates through the inner part of the second inner cylinder along the axial direction of the second inner cylinder; the second feeding device and the second discharging device are both communicated with the second inner cylinder;
a star-structured feeding valve is fixed at the top of the second mixture inlet; a discharge valve in a star-shaped structure is arranged at the bottom of the third mixture outlet;
the system further comprises a heating unit; the heating unit comprises a first combustion chamber, a first air adjusting chamber communicated with the first combustion chamber, a second combustion chamber and a second air adjusting chamber communicated with the second combustion chamber;
the first air regulating chamber is provided with a first hot flue gas outlet; the top of one side of the first outer cylinder, which is close to the first discharging device, is provided with a first hot flue gas inlet; the first air adjusting chamber is communicated with the first outer cylinder through the first hot flue gas outlet and the first hot flue gas inlet;
the second air regulating chamber is provided with a second hot flue gas outlet; the top of one side, close to the second discharging device, of the second outer cylinder is provided with a second hot flue gas inlet; the second air conditioning chamber and the second outer cylinder are communicated through the second hot flue gas outlet and the second hot flue gas inlet;
the top of one side, away from the second discharging device, of the second outer cylinder is provided with a first return air outlet; the bottom of one side of the first outer cylinder, which is close to the first discharging device, is provided with a first return air inlet; the first outer cylinder and the second outer cylinder are communicated through the first return air outlet and the first return air inlet;
a second recycled air outlet is formed in the top of one side, away from the first discharging device, of the first outer cylinder; a second recycled air inlet is formed in one side, away from the first outer barrel, of the first feeding device; the first outer cylinder and the first feeding device are communicated through the second recycled air outlet and the second recycled air inlet.
2. The sludge back-mixing treatment system as claimed in claim 1, wherein the outer wall of the first inner barrel is rotatably connected with the inner wall of the first outer barrel; the first inner cylinder can rotate around the axial direction of the first outer cylinder;
the outer wall of the second inner barrel is rotationally connected with the inner wall of the second outer barrel; the second inner cylinder can rotate around the axial direction of the second outer cylinder.
3. The sludge backmixing treatment system of claim 1, wherein a valve is disposed between the first combustion chamber and the second combustion chamber; the first combustion chamber and the second combustion chamber can be communicated by controlling the valve;
the first combustion chamber is also provided with a first heat source inlet; the second combustion chamber is also provided with a second heat source inlet;
the first air conditioning chamber is also provided with a first secondary air inlet; the second air conditioning chamber is also provided with a second secondary air inlet.
4. The sludge back-mixing treatment system as claimed in claim 3, wherein the system further comprises a dry distillation gas treatment unit;
the dry distillation gas treatment unit comprises a dry distillation gas processor; the dry distillation gas processor is provided with a first dry distillation gas inlet; the top of the second discharging device is provided with a first dry distillation gas outlet; the dry distillation gas processor and the second discharging device are communicated through the first dry distillation gas inlet and the first dry distillation gas outlet.
5. The sludge back-mixing treatment system as claimed in claim 4, wherein the dry distillation gas processor is further provided with a second dry distillation gas outlet; the second combustion chamber is provided with a second dry distillation gas inlet; the second carbonization gas outlet and the second carbonization gas inlet are communicated with the carbonization gas processor and the second combustion chamber.
6. The sludge back-mixing treatment system as claimed in claim 1, wherein the system further comprises a tail gas treatment unit;
the tail gas treatment unit comprises a tail gas processor; one end of the tail gas processor is provided with a tail gas inlet, and the other end of the tail gas processor is provided with a tail gas outlet; a third recycled air outlet is formed in the top of the first discharging device; and the first discharging device is communicated with the tail gas processor through the third recycling air outlet and the tail gas inlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910119730.6A CN109851200B (en) | 2019-02-18 | 2019-02-18 | Sludge back-mixing treatment system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910119730.6A CN109851200B (en) | 2019-02-18 | 2019-02-18 | Sludge back-mixing treatment system and method |
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| CN109851200A CN109851200A (en) | 2019-06-07 |
| CN109851200B true CN109851200B (en) | 2022-05-31 |
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| CN117623582B (en) * | 2024-01-25 | 2024-04-26 | 湖南清源华建环境科技有限公司 | Superheated steam drying heat recovery sludge back mixing device, system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106746462A (en) * | 2016-12-30 | 2017-05-31 | 誉晟蓝天环境科技（北京）有限公司 | A kind of oily sludge carbonization treatment apparatus |
| CN206635200U (en) * | 2016-12-30 | 2017-11-14 | 誉晟蓝天环境科技（北京）有限公司 | A kind of scraper-type oily sludge drying machine and dry carbonizing plant |
| CN208234746U (en) * | 2018-03-30 | 2018-12-14 | 江苏中顺节能科技有限公司 | Economic benefits and social benefits sludge indirectly drying system |
| CN109053321A (en) * | 2018-08-02 | 2018-12-21 | 上海市政工程设计研究总院（集团）有限公司 | A kind of sludge carbon makees the compost method of auxiliary material |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106746462A (en) * | 2016-12-30 | 2017-05-31 | 誉晟蓝天环境科技（北京）有限公司 | A kind of oily sludge carbonization treatment apparatus |
| CN206635200U (en) * | 2016-12-30 | 2017-11-14 | 誉晟蓝天环境科技（北京）有限公司 | A kind of scraper-type oily sludge drying machine and dry carbonizing plant |
| CN208234746U (en) * | 2018-03-30 | 2018-12-14 | 江苏中顺节能科技有限公司 | Economic benefits and social benefits sludge indirectly drying system |
| CN109053321A (en) * | 2018-08-02 | 2018-12-21 | 上海市政工程设计研究总院（集团）有限公司 | A kind of sludge carbon makees the compost method of auxiliary material |
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