CN109851192B - Sludge treatment system capable of reducing energy consumption - Google Patents
Sludge treatment system capable of reducing energy consumption Download PDFInfo
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- CN109851192B CN109851192B CN201910119916.1A CN201910119916A CN109851192B CN 109851192 B CN109851192 B CN 109851192B CN 201910119916 A CN201910119916 A CN 201910119916A CN 109851192 B CN109851192 B CN 109851192B
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- 239000010802 sludge Substances 0.000 title claims abstract description 102
- 238000005265 energy consumption Methods 0.000 title claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 65
- 238000003763 carbonization Methods 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 24
- 238000007906 compression Methods 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 20
- 238000010000 carbonizing Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 140
- 238000000197 pyrolysis Methods 0.000 claims description 65
- 238000005406 washing Methods 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000002485 combustion reaction Methods 0.000 claims description 43
- 239000002245 particle Substances 0.000 claims description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 36
- 239000003546 flue gas Substances 0.000 claims description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 30
- 239000003513 alkali Substances 0.000 claims description 16
- 238000004378 air conditioning Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000006096 absorbing agent Substances 0.000 claims description 6
- 239000003518 caustics Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000006303 photolysis reaction Methods 0.000 claims description 4
- 230000015843 photosynthesis, light reaction Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 208000005156 Dehydration Diseases 0.000 description 8
- 230000018044 dehydration Effects 0.000 description 8
- 238000006297 dehydration reaction Methods 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
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- 230000008901 benefit Effects 0.000 description 3
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- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention relates to a sludge treatment system capable of reducing energy consumption, which comprises a compression unit, a crushing unit, a drying unit and a carbonization unit; the compression unit can compress the sludge into mud cakes; the crushing unit comprises a primary crusher and a secondary crusher; the mud cake passes through a primary crusher and a secondary crusher in sequence; 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 treatment system capable of reducing energy consumption.
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 rot 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 glue binding structure is formed, and the dehydration is not easy; (4) the product 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; and (4) the social comprehensive benefits are high.
Wherein, the drying carbonization treatment comprises two steps of drying and carbonization. The water content of the sludge is reduced through drying treatment. And then carbonizing to generate crude dry distillation gas containing a small amount of tar and biochar. And finally, respectively treating the crude pyrolysis gas and the biochar and recycling energy. Therefore, the hidden danger of dioxin generated by direct drying and combustion of the sludge is effectively prevented.
At present, in the sludge treatment process, sludge dehydration is difficult, and further the dehydration energy consumption is large.
Disclosure of Invention
In order to solve the problems that the sludge is difficult to dehydrate in the sludge disposal process and further the energy consumption of dehydration is large, the invention provides a sludge treatment system capable of reducing the energy consumption.
The sludge treatment system for reducing energy consumption comprises a compression unit, a crushing unit, a drying unit and a carbonization unit which are sequentially arranged;
the compression unit can compress the sludge into a mud cake; one end of the compression unit is provided with a sludge input port, and the other end of the compression unit is provided with a first mud cake output port;
the crushing unit comprises a primary crusher and a secondary crusher; the mud cakes sequentially pass through the primary crusher and the secondary crusher; a first mud cake input port is formed in one end, far away from the secondary crusher, of the primary crusher; the compression unit and the primary crusher are communicated through the first mud cake output port and the first mud cake input port; a second mud cake output port is formed in one end, far away from the primary crusher, of the secondary crusher;
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;
a second mud cake input port is formed in the top of the first feeding device; the second-stage crusher and the first feeding device are communicated through the second mud cake input port and the second mud cake output port;
a third mud cake output port is formed at 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 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;
a third mud cake input port is formed in the top of the second feeding device; the first discharging device and the second feeding device are communicated through the third mud cake input port and the third mud cake output port;
the bottom of the second discharging device is provided with a biochar outlet;
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 communicated with the second inner cylinder.
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 first heating unit and a second heating unit;
the first heating unit comprises a first combustion chamber and a first air adjusting chamber communicated with the first combustion chamber; the second heating unit comprises 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 adjusting chamber is provided with a second hot smoke 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 specific embodiment, 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;
in one embodiment, the system further comprises a retort gas treatment unit;
the dry distillation gas treatment unit comprises a first water washing tower, a first alkaline washing tower and a tar catcher which are sequentially arranged; the dry distillation gas sequentially flows through the first water scrubber, the first alkaline washing tower and the tar catcher;
the bottom of the first water washing tower 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 first water washing tower and the second discharging device are communicated through the first dry distillation gas inlet and the first dry distillation gas outlet;
a second dry distillation gas inlet is formed in the bottom of the first alkaline washing tower; a second dry distillation gas outlet is formed in the top of the first water washing tower; the first water washing tower and the first alkaline washing tower are communicated through the second dry distillation gas inlet and the second dry distillation gas outlet;
one end of the tar catcher is provided with a third dry distillation gas inlet; a third dry distillation gas outlet is formed in the top of the first alkaline washing tower; the first alkaline washing tower and the tar catcher are communicated through the third dry distillation gas inlet and the third dry distillation gas outlet;
a fourth dry distillation gas outlet is formed in one end, far away from the third dry distillation gas inlet, of the tar catcher; the second combustion chamber is provided with a fourth dry distillation gas inlet; the tar trap and the second combustion chamber are communicated through the fourth dry distillation gas outlet and the fourth dry distillation gas inlet.
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 second water washing tower, a second alkali washing tower, an ultraviolet light photolyzer and an activated carbon adsorber which are sequentially arranged; tail gas sequentially flows through the second water washing tower, the second alkali washing tower, the ultraviolet photolyzer and the activated carbon adsorber;
a first tail gas inlet is formed in the bottom of the second water washing tower; a third recycling air outlet is formed in the top of the first discharging device; the first discharging device and the second washing tower are communicated through the third recycling air outlet and the first tail gas inlet;
a first tail gas outlet is formed in the top of the second water washing tower; a second tail gas inlet is formed in the bottom of the second alkali washing tower; the second water washing tower and the second alkali washing tower are communicated through the first tail gas outlet and the second tail gas inlet;
a second tail gas outlet is formed in the top of the second alkali washing tower; one end of the ultraviolet photolysis device is provided with a third tail gas inlet, and the other end of the ultraviolet photolysis device is provided with a third tail gas outlet; the ultraviolet photolyzer and the second caustic scrubber are communicated through the third tail gas inlet and the second tail gas outlet;
one end of the activated carbon absorber is provided with a fourth tail gas inlet, and the other end of the activated carbon absorber is provided with a fourth tail gas outlet; and the ultraviolet photolyzer and the activated carbon adsorber are communicated through the fourth tail gas inlet and the third tail gas outlet.
The invention has the beneficial effects that: according to the system, the compression unit is arranged, so that the sludge can be dehydrated, and the water content of the sludge is reduced. And the compression unit can change the form of the sludge, and the sludge is processed into mud cakes, so that the subsequent processing treatment is facilitated. The crushing unit can effectively reduce the particle size of sludge particles, and further increase the total surface area of the particles, thereby reducing the difficulty of sludge dehydration and greatly reducing the dehydration energy consumption.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a sludge treatment system for reducing energy consumption according to the present invention;
FIG. 2 is a schematic diagram of a drying unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of a carbonization unit according to an embodiment of the invention;
FIG. 4 is a schematic diagram of another embodiment of the sludge treatment system with reduced energy consumption according to the present invention;
FIG. 5 is a flow chart of an embodiment of a method of sludge treatment to reduce energy consumption according to the present invention;
FIG. 6 is a flow chart of another embodiment of the method for sludge treatment with reduced energy consumption according to 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, the system includes a compression unit 110, a crushing unit 120, a drying unit 130, and a carbonization unit 140, which are sequentially disposed. The compression unit 110 is capable of compressing the sludge into a mud cake. One end of the compression unit 110 is provided with a sludge input port, and the other end is provided with a first sludge cake output port. The crushing unit 120 includes a primary crusher 121 and a secondary crusher 122, and the sludge cake passes through the primary crusher 121 and the secondary crusher 122 in sequence. One end of the primary crusher 121 far away from the secondary crusher 122 is provided with a first mud cake inlet. The compression unit 110 and the primary crusher 121 are communicated through a first cake output port and a first cake input port. And a second mud cake output port is arranged at one end of the secondary crusher 122 far away from the primary crusher 121. The drying unit 130 includes a dryer 131, a first feeding device 132 fixed to an end of the dryer 131, and a first discharging device 133 fixed to an end of the dryer 131 remote from the first feeding device 132. The top of the first feeding device 132 is provided with a second mudcake input port 1321, and the second-stage crusher 122 and the first feeding device 132 are communicated through the second mudcake input port 1321 and the second mudcake output port. The bottom of the first discharging device 133 is provided with a third mud cake output port 1332. The dryer 131 includes a first inner cylinder 1312 and a first outer cylinder 1311, the first inner cylinder 1312 is inserted into the first outer cylinder 1311, and the first inner cylinder 1312 and the first outer cylinder 1311 are movably connected to each other. A first push rod 1313 is inserted into the first inner cylinder 1312 in the axial direction of the first inner cylinder 1312. The first feeding device 132 and the first discharging device 133 are both communicated with the first inner cylinder 1312. The carbonizing unit 140 includes a carbonizing machine 141, a second feeding device 143 fixed to an end of the carbonizing machine 141, and a second discharging device 142 fixed to an end of the carbonizing machine 141 remote from the second feeding device 143. The top of the second feeding device 143 is provided with a third mud cake input 1431, and the first discharging device 133 and the second feeding device 143 are communicated through the third mud cake input 1431 and the third mud cake output 1332. The bottom of the second discharging device 142 is provided with a biochar outlet 1422. The carbonizing machine 141 includes a second inner cylinder 1412 and a second outer cylinder 1411, the second inner cylinder 1411 is inserted into the second outer cylinder 1412, and the second inner cylinder 1411 is movably connected with the second outer cylinder 1412. A second pushing rod 1413 penetrates through the second inner cylinder 1412 in the axial direction of the second inner cylinder 1412; the second feeding device 143 and the second discharging device 142 are both communicated with the second inner cylinder 1412.
In this embodiment, the sludge sequentially flows through the compression unit 110, the crushing unit 120, the drying unit 130, and the carbonization unit 140. The compression unit 110 can perform dehydration treatment on the sludge, thereby reducing the water content of the sludge. In addition, the compression unit 110 can change the form of the sludge, and the sludge is processed into mud cakes, so that the subsequent processing treatment is facilitated. At this time, the water content of the sludge is 55-65%, and the particle size of the sludge particles is 450-550mm. The mud cake with the particle size of 450-550mm enters the first-stage crusher 121 from the compression unit 110 through the first mud cake output port and the first mud cake input port. The primary crusher 121 is capable of reducing the particle size of the mud cake to 45-55mm. The mud cake then enters a secondary crusher 122. The secondary crusher 122 can perform layering and pelletizing treatment on the mud cake, and reduce the particle size of the sludge to 3-7mm. Therefore, the total surface area of the sludge particles is greatly increased, and the dehydration difficulty is effectively reduced. The drying unit 130 includes a dryer 131, a first feeding device 132, and a first discharging device 133. The dryer 131 includes a first inner cylinder 1312 and a first outer cylinder 1311, and the first feeding device 132 and the first discharging device 133 are both communicated with the first inner cylinder 1312. The sludge enters the dryer 131 through the first feeding device 132, and is processed by the dryer 131 and then output through the first discharging device 133. A first push rod 1313 is inserted into the first inner cylinder 1312 in the axial direction of the first inner cylinder 1312. The sludge moves inside the first inner tube 1312 by being pushed by the first push rod 1313. Sludge is delivered from the secondary crusher 122 to the first feeding device 132 through a second cake input 1321 and a second cake output. The carbonizing unit 140 includes a carbonizing machine 141, a second feeding device 143, and a second discharging device 142. The carbonizer 141 includes a second inner cylinder 1412 and a second outer cylinder 1411, and the second feeding device 143 and the second discharging device 142 are both communicated with the second inner cylinder 1412. The sludge enters the carbonizer 141 through the first discharging device 133 and the second feeding device 143. Wherein, the bottom of the first discharging device 133 is provided with a third mud cake output port 1332, the top of the second feeding device 143 is provided with a third mud cake input port 1431, and the sludge is input from the first discharging device 133 to the second feeding device 143 through the third mud cake input port 1431 and the third mud cake output port 1332. The bottom of the second discharging device 142 is provided with a biochar outlet 1422. The sludge is treated by the carbonizer 141 to produce biochar, which is output from the interior of the second discharging device 142 through the biochar outlet 1422. A second push rod 1413 is inserted into the second inner cylinder 1412 in the axial direction of the second inner cylinder 1412. The sludge moves inside the second inner cylinder 1412 by being pushed by the second push rod 1413.
In an embodiment of the present invention, the outer wall of the first inner cylinder 1312 is rotatably connected to the inner wall of the first outer cylinder 1311, and the first inner cylinder 1312 is capable of rotating around the axial direction of the first outer cylinder 1311. The outer wall of the second inner cylinder 1412 is rotatably connected with the inner wall of the second outer cylinder 1411, and the second inner cylinder 1412 can rotate around the axial direction of the second outer cylinder 1411. In this way, the first outer cylinder 1311 is kept stationary, and the first inner cylinder 1312 rotates to turn the sludge inside the dryer 131. The second outer cylinder 1411 is kept stationary and the second inner cylinder 1412 rotates so that the sludge is turned inside the carbonizer 141.
In a specific embodiment of the present invention, the system further comprises a first heating unit 150 and a second heating unit 160. The first heating unit 150 includes a first combustion chamber and a first air conditioning chamber in communication with the first combustion chamber, and the second heating unit 160 includes a second combustion chamber and a second air conditioning chamber in communication with the second combustion chamber.
The first air conditioning chamber is provided with a first hot flue gas outlet, the top of one side of the first outer barrel 1311 close to the first discharging device 133 is provided with a first hot flue gas inlet 13112, and the first air conditioning chamber and the first outer barrel 1311 are communicated through the first hot flue gas outlet and the first hot flue gas inlet 13112. In this way, hot flue gas at 300-500 ℃ is pushed between the first outer cylinder 1311 and the first inner cylinder 1312 of the dryer 131 through the first air conditioning chamber, and indirectly heats sludge in the first inner cylinder 1312.
The second air conditioning chamber is provided with a second hot flue gas outlet, the top of one side, close to the second discharging device 142, of the second outer cylinder 1411 is provided with a second hot flue gas inlet 14111, and the second air conditioning chamber and the second outer cylinder 1411 are communicated through the second hot flue gas outlet and the second hot flue gas inlet 14111. Thus, the hot flue gas with the temperature of 750-800 ℃ is pushed between the second inner barrel 1412 and the second outer barrel 1411 of the carbonizing machine 141 through the second air conditioning chamber, and indirectly heats the sludge in the second inner barrel 1412.
The first combustion chamber is also provided with a first heat source inlet, and a heat source is added to the first combustion chamber through the first heat source inlet. The second combustion chamber is also provided with a second heat source inlet, and a heat source is added to the second combustion chamber through the second heat source inlet. The heat source includes: biomass, dry distillation gas, kerosene, and the like.
In addition, the first air regulating chamber is also provided with a first secondary air inlet which is connected with the fan, so that an air source can be blown into the first air regulating chamber. The second air adjusting chamber is also provided with a second secondary air inlet which is connected with the fan through the second secondary air inlet, so that an air inlet source can be blown into the second air adjusting chamber. And a valve is arranged between the first combustion chamber and the second combustion chamber, and the first combustion chamber and the second combustion chamber can be communicated by controlling the valve. In this way, when the internal heat energy of the second combustion chamber is large, the heat energy can be supplemented for the first combustion chamber.
In one embodiment of the invention, the system further comprises a retort gas treatment unit 170. The sludge is treated by the carbonizer 141 to generate dry distillation gas. The dry distillation gas flows through the second discharging device 142 and enters the dry distillation gas treatment unit 170. The dry distillation gas treatment unit 170 includes a first water scrubber 171, a first caustic scrubber 172, and a tar trap 173, which are sequentially disposed, and the dry distillation gas sequentially flows through the first water scrubber 171, the first caustic scrubber 172, and the tar trap 173. The first water scrubber 171 is provided at the bottom thereof with a first dry distillation gas inlet, the second discharging device 142 is provided at the top thereof with a first dry distillation gas outlet 1421, and the first water scrubber 171 and the second discharging device 142 are connected to each other via the first dry distillation gas inlet and the first dry distillation gas outlet 1421. The bottom of the first alkaline washing tower 172 is provided with a second dry distillation gas inlet, the top of the first water washing tower 171 is provided with a second dry distillation gas outlet, and the first water washing tower 171 and the first alkaline washing tower 172 are communicated through the second dry distillation gas inlet and the second dry distillation gas outlet. One end of the tar trap 173 is provided with a third dry distillation gas inlet, the top of the first alkaline tower 172 is provided with a third dry distillation gas outlet, and the first alkaline tower 172 and the tar trap 173 are communicated through the third dry distillation gas inlet and the third dry distillation gas outlet. The first water scrubber 171 can perform processes such as temperature reduction and dust removal on the dry distillation gas. The first caustic tower 172 can remove acid gas mixed into the dry distillation gas. The tar trap 173 can remove tar droplets mixed in the dry distillation gas. A fourth dry distillation gas outlet is formed in one end, far away from the third dry distillation gas inlet, of the tar catcher 173, and a fourth dry distillation gas inlet is formed in the second combustion chamber; the tar trap 173 and the second combustion chamber are communicated through the fourth retort gas outlet and the fourth retort gas inlet. Therefore, the retorting gas treated by the retorting gas treatment unit 170 can be used as a heat source of the second combustion chamber to enter the second combustion chamber, and the utilization rate of resources is effectively improved.
In an embodiment of the invention, a first recycled air outlet 14112 is provided at the top of one side of the second outer cylinder 1411 far away from the second discharging device 142, a first recycled air inlet 13113 is provided at the bottom of one side of the first outer cylinder 1311 near the first discharging device 133, and the first outer cylinder 1311 and the second outer cylinder 1411 are communicated through the first recycled air outlet 14112 and the first recycled air inlet 13113. Therefore, the hot flue gas with the temperature of 750-800 ℃ is pressed between the second inner cylinder 1412 and the second outer cylinder 1411 of the carbonizing machine 141, the temperature of the hot flue gas is controlled to be 300-350 ℃ after the mixture in the second inner cylinder 1412 is indirectly heated, and then the hot flue gas is pressed between the first outer cylinder 1311 and the first inner cylinder 1312 of the drying machine 131 through the first recycled air outlet 14112 and the first recycled air inlet 13113 to be used as supplementary heat energy to indirectly heat the mixture in the first inner cylinder 1312, 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 13111 is arranged at the top of one side of the first outer cylinder 1311, which is far away from the first discharging device 133, a second recycled air inlet 1322 is arranged at one side of the first feeding device 132, which is far away from the first outer cylinder 1311, and the first outer cylinder 1311 and the first feeding device 132 are communicated through the second recycled air outlet 13111 and the second recycled air inlet 1322. Therefore, hot flue gas between the first outer cylinder 1311 and the first inner cylinder 1312 can enter the first inner cylinder 1312 through the first feeding device 132, and can directly contact a mixture in the first inner cylinder 1312, so that direct heating is realized, and the drying efficiency is greatly improved.
In a specific embodiment of the present invention, the system further includes a tail gas processing unit 180, the tail gas processing unit includes a second water washing tower 181, a second alkali washing tower 182, an ultraviolet light photolyzer 183, and an activated carbon adsorber 184, which are sequentially arranged, and the tail gas sequentially flows through the second water washing tower 181, the second alkali washing tower 182, the ultraviolet light photolyzer 183, and the activated carbon adsorber 184. Wherein, the second water scrubber 181 can condense, cool down and remove dust to the tail gas. The second caustic scrubber 182 is capable of removing acid gases from the tail gas. The ultraviolet light photolyzer 183 can remove volatile organic compounds and odor-containing gases from the exhaust gas. The activated carbon adsorber 184 can further remove odorous gases in the exhaust gas. Therefore, the treatment of tail gas is greatly enhanced, and the harm of sludge treatment to the environment is reduced. The bottom of the second water scrubber 181 is provided with a first tail gas inlet, the top of the first discharging device 133 is provided with a third recycled air outlet 1331, and the first discharging device 133 and the second water scrubber 181 are communicated through the third recycled air outlet 1331 and the first tail gas inlet. The hot flue gas flows through the first inner cylinder 1312 and enters the first discharging device 133, 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 second water scrubber 181 through the third recycling air outlet 1331 and the first tail gas inlet. The top of second water scrubber 181 is equipped with first tail gas outlet, and the bottom of second alkali scrubber 182 is equipped with the second tail gas entry, through first tail gas outlet and second tail gas entry intercommunication second water scrubber 181 and second alkali scrubber 182. A second tail gas outlet is arranged at the top of the second alkali washing tower 182, a third tail gas inlet is arranged at one end of the ultraviolet light photolyzer 183, a third tail gas outlet is arranged at the other end of the ultraviolet light photolyzer 183, and the ultraviolet light photolyzer 183 and the second alkali washing tower 182 are communicated through the third tail gas inlet and the second tail gas outlet. One end of the activated carbon absorber 184 is provided with a fourth tail gas inlet, the other end is provided with a fourth tail gas outlet, and the ultraviolet light photolyzer 183 and the activated carbon absorber 184 are communicated through the fourth tail gas inlet and the third tail gas outlet. The tail gas exits the system through a fourth tail gas outlet.
In other embodiments, the hot flue gas flows through the first inner barrel 1312 and enters the first discharging device 133, and after the temperature of the hot flue gas is controlled to 120-150 ℃, the hot flue gas enters the first air conditioning chamber as recycled air through the third recycled air outlet 1331 and is utilized in the first air conditioning chamber.
Referring to fig. 5, as a specific example of the method for sludge treatment to reduce energy consumption according to the present invention, the method includes dewatering sludge, pressing the dewatered sludge into a sludge cake S1000, crushing the sludge cake to obtain sludge particles S2000, drying the sludge particles S3000, and carbonizing the sludge particles S4000.
Specifically, the sludge is dewatered and pressed into a sludge cake S1000 by processing the sludge having a water content of 80 to 95% into a sludge having a water content of 55 to 65% and pressing into a sludge cake. The mud cake is crushed to obtain sludge particles S2000, the mud cake is processed into the sludge particles, and the particle size of the particles is changed to increase the total surface area of the particles. And the step S3000 of drying the sludge particles is to continuously dry the sludge particles for 1 hour at the temperature of 200 ℃ so as to obtain the sludge particles with the water content of 20%. The carbonization treatment of the sludge granules S4000 is to continuously heat the sludge granules for 30 minutes using a high temperature of 800 ℃ under the conditions of normal pressure and absolute oxygen.
Referring to fig. 5 and 6, crushing the mud cake to obtain sludge particles S2000 includes performing primary crushing on the mud cake, converting the mud cake into coarse crushed particles S2100, and performing secondary crushing on the coarse crushed particles to obtain fine crushed particles as final sludge particles.
The sludge is dehydrated and pressed into a sludge cake S1000, which comprises the following steps of mixing sludge and quicklime according to the mass fraction ratio of 9:1, after premixing S1100, pressing the sludge after premixing into the mud cake S1200.
Specifically, the sludge with the water content of 80 percent to 95 percent and the quicklime are mixed according to the mass fraction ratio of 9:1, and compressing the mixed sludge. The compression is carried out under 1.3.7 Mpa for 5 hr, and the sludge can be processed into mud cake with particle size of 450-550mm. At this time, the water content of the mud cake is 55% -65%. Mud cakes with the grain size of 450-550mm can be processed into coarse crushed grains by performing primary crushing treatment on the mud cakes to convert the mud cakes into coarse crushed grains S2100. The particle size of the coarse crushed particles is reduced to 45-55mm. Thereafter, the coarse crushed particles are subjected to secondary crushing treatment to obtain fine crushed particles as final sludge particles S2200, and the coarse crushed particles can be processed into fine crushed particles. The particle size of the finely divided particles is reduced to 3-7mm.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples," etc., 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 to be within the scope of the present invention, and the technical solutions and their concepts should be equally replaced or changed within the scope of the present invention.
Claims (6)
1. A sludge treatment system for reducing energy consumption, comprising:
the device comprises a compression unit, a crushing unit, a drying unit and a carbonization unit which are arranged in sequence;
the compression unit can compress the sludge into a mud cake; one end of the compression unit is provided with a sludge input port, and the other end of the compression unit is provided with a first mud cake output port;
the crushing unit comprises a primary crusher and a secondary crusher; the mud cakes sequentially pass through the primary crusher and the secondary crusher; a first mud cake input port is formed in one end, far away from the secondary crusher, of the primary crusher; the compression unit and the primary crusher are communicated through the first mud cake output port and the first mud cake input port; a second mud cake output port is formed in one end, far away from the primary crusher, of the secondary crusher; mud cakes with the particle size of 450-550mm enter the primary crusher from the compression unit through the first mud cake output port and the first mud cake input port; the primary crusher can reduce the particle size of the mud cake to 45-55mm; the secondary crusher can be used for layering and granulating mud cakes with the particle size of 45-55mm so as to reduce the particle size of the mud to 3-7mm;
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;
a second mud cake input port is formed in the top of the first feeding device; the second-stage crusher and the first feeding device are communicated through the second mud cake input port and the second mud cake output port;
a third mud cake output port is formed at 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 outer wall of the first inner cylinder is rotationally 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, and the first inner cylinder and the first outer cylinder are fixed, so that sludge in the dryer can be turned over;
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;
a third mud cake input port is formed in the top of the second feeding device; the first discharging device and the second feeding device are communicated through the third mud cake input port and the third mud cake output port;
a biochar 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;
the outer wall of the second inner cylinder is rotationally connected with the inner wall of the second outer cylinder, the second inner cylinder can rotate around the axial direction of the second outer cylinder, and the second inner cylinder and the second outer cylinder are fixed, so that sludge in the carbonizer can be turned over;
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 energy consumption reduction sludge treatment system of claim 1 wherein the outer wall of the first inner drum is rotatably connected to the inner wall of the first outer drum; 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 energy efficient sludge treatment system of claim 1 wherein the system further comprises a first heating unit and a second heating unit;
the first heating unit comprises a first combustion chamber and a first air adjusting chamber communicated with the first combustion chamber; the second heating unit comprises a second combustion chamber and a second air conditioning 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 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.
4. The energy consumption reducing sludge treatment system of claim 3 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.
5. The energy consumption reducing sludge treatment system of claim 3 wherein the system further comprises a retort gas treatment unit;
the dry distillation gas treatment unit comprises a first water washing tower, a first alkaline washing tower and a tar catcher which are sequentially arranged; the dry distillation gas sequentially flows through the first water scrubber, the first alkaline washing tower and the tar catcher;
the bottom of the first water washing tower 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 first water washing tower and the second discharging device are communicated through the first dry distillation gas inlet and the first dry distillation gas outlet;
a second dry distillation gas inlet is formed in the bottom of the first alkaline washing tower; a second dry distillation gas outlet is formed in the top of the first water washing tower; the first water washing tower and the first alkaline washing tower are communicated through the second dry distillation gas inlet and the second dry distillation gas outlet;
one end of the tar catcher is provided with a third dry distillation gas inlet; a third dry distillation gas outlet is formed in the top of the first alkaline washing tower; the first alkaline washing tower and the tar catcher are communicated through the third dry distillation gas inlet and the third dry distillation gas outlet;
a fourth dry distillation gas outlet is formed in one end, far away from the third dry distillation gas inlet, of the tar catcher; the second combustion chamber is provided with a fourth dry distillation gas inlet; the tar trap and the second combustion chamber are communicated through the fourth dry distillation gas outlet and the fourth dry distillation gas inlet.
6. The energy consumption reducing sludge treatment system of claim 1 further comprising a tail gas treatment unit;
the tail gas treatment unit comprises a second water washing tower, a second alkali washing tower, an ultraviolet light photolyzer and an activated carbon adsorber which are sequentially arranged; tail gas sequentially flows through the second water washing tower, the second alkali washing tower, the ultraviolet photolyzer and the activated carbon adsorber;
a first tail gas inlet is formed in the bottom of the second water washing tower; a third recycled air outlet is formed in the top of the first discharging device; the first discharging device and the second washing tower are communicated through the third recycling air outlet and the first tail gas inlet;
a first tail gas outlet is formed in the top of the second water washing tower; a second tail gas inlet is formed in the bottom of the second alkali washing tower; the first tail gas outlet and the second tail gas inlet are communicated with the second water washing tower and the second alkali washing tower;
a second tail gas outlet is formed in the top of the second alkali washing tower; one end of the ultraviolet photolysis device is provided with a third tail gas inlet, and the other end of the ultraviolet photolysis device is provided with a third tail gas outlet; the ultraviolet photolyzer and the second caustic scrubber are communicated through the third tail gas inlet and the second tail gas outlet;
one end of the activated carbon absorber is provided with a fourth tail gas inlet, and the other end of the activated carbon absorber is provided with a fourth tail gas outlet; and the ultraviolet photolyzer and the activated carbon adsorber are communicated through the fourth tail gas inlet and the third tail gas outlet.
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| CN201910119916.1A CN109851192B (en) | 2019-02-18 | 2019-02-18 | Sludge treatment system capable of reducing energy consumption |
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| CN201910119916.1A CN109851192B (en) | 2019-02-18 | 2019-02-18 | Sludge treatment system capable of reducing energy consumption |
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| CN109851192B true CN109851192B (en) | 2022-10-11 |
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| CN103920378B (en) * | 2014-05-08 | 2016-03-09 | 山东天力干燥股份有限公司 | A kind of municipal sludge drying tail gas treating apparatus and method |
| 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 |
| CN206783511U (en) * | 2017-05-03 | 2017-12-22 | 南京万德斯环保科技股份有限公司 | A kind of deeply dehydrating sludge, desiccation, carbonization treatment disposal system |
| CN109205975A (en) * | 2018-11-21 | 2019-01-15 | 中节能博实(湖北)环境工程技术股份有限公司 | Sludge carbonization treatment system and technique |
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