CN116573829A - Method and device for continuously drying sludge with low carbon by pulsating fluidization heat carrier - Google Patents
Method and device for continuously drying sludge with low carbon by pulsating fluidization heat carrier Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 192
- 238000001035 drying Methods 0.000 title claims abstract description 114
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005243 fluidization Methods 0.000 title claims abstract description 11
- 230000003068 static effect Effects 0.000 claims abstract description 53
- 230000010349 pulsation Effects 0.000 claims abstract description 52
- 239000002245 particle Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 239000012159 carrier gas Substances 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000005728 strengthening Methods 0.000 claims abstract description 5
- 239000002918 waste heat Substances 0.000 claims abstract description 5
- 238000002309 gasification Methods 0.000 claims abstract description 4
- 239000002912 waste gas Substances 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 20
- 239000003546 flue gas Substances 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 12
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 16
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
- C02F11/131—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating using electromagnetic or ultrasonic waves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method and a device for continuously drying sludge with low carbon by using a pulsating fluidized heat carrier, and belongs to the technical field of solid waste treatment. Aiming at the difficult industrial problems of difficult drying, high energy consumption, low efficiency, high carbon emission and the like in the prior sludge treatment, the invention adds a heat carrier into a static pulsation dryer and introduces a heat carrier gas to enable the heat carrier to be in a high-temperature fluidization state; the sludge is pretreated by microwaves and enters a static pulsation dryer, so that moisture in the sludge is quickly evaporated to gaps among particles in a sludge cluster, and the sludge viscosity is reduced while the gasification of combined water is realized; after the sludge entering the static pulsation dryer collides with the heat carrier and is mixed, the fluidized drying is continuously carried out, so that the separation of the heat carrier, dry sludge and wet sludge is realized while the wall adhesion in the drying process is reduced; and (3) further strengthening and drying the dry sludge by utilizing microwaves and waste heat, realizing gas-solid separation in the separator, and enabling the waste gas to enter a tail gas treatment device for treatment, so as to finally obtain the dried sludge.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment, and particularly relates to a method for realizing continuous drying of sludge with low carbon emission by adopting a pulsating gas flow separation device independently developed by combining microwaves and hot air under a micro negative pressure environment through intensified heat transfer of a heat carrier.
Background
The rapid development of urbanization causes the sewage treatment capacity to be larger and larger, and the sludge yield to be increased dramatically year by year. The phenomenon of heavy water and light mud is still needed to be further improved in the sludge treatment technology. The water content of the sludge discharged from the sewage treatment plant is about 80 percent through simple mechanical filter pressing, so that the volume of the sludge is overlarge, the sludge is sticky, and direct recycling and harmless treatment are difficult to realize. Therefore, the sludge is required to be dehydrated and dried, the stacking volume of the sludge is reduced, the transportation and treatment cost of the sludge is reduced, and the difficulty of recycling the sludge is further reduced.
The current common sludge dewatering methods comprise mechanical dewatering and drying, ultrasonic dewatering and drying, heat treatment dewatering and drying and the like. The mechanical dehydration method is generally to separate the sludge by mechanically forcing water, and is simple and direct, but the method has the defects of excessively high energy consumption, excessively large occupied area, severe drying environment and relatively low drying efficiency. Although the ultrasonic dehydration drying technology can improve the drying efficiency of sludge, the influencing factors are too complex to be used for practical application. The heat treatment sludge dewatering and drying technology realizes drying of sludge by heating, can achieve good drying effect, but has relatively long drying time and large energy consumption, sludge clusters are easily attached to drying equipment in the sludge drying process, meanwhile, the sludge is unevenly heated, heat is conducted from outside to inside, the sludge drying effect is easily affected by a phenomenon of crusting and the like, the sludge drying time is prolonged, the energy consumption required by sludge drying is increased, and the carbon emission in the drying process is increased.
CN112374722a discloses a device for drying sludge by using a heating medium and adopting a fluidized bed, but as sludge drying proceeds, heat exchange efficiency caused by adhesion of sludge to walls becomes low, energy consumption in a drying process is excessively high, and carbon emission is increased. CN212051089U discloses a sludge drying device for improving drying efficiency of sludge by separately arranging a plurality of ventilation boxes, but because the separately arranged ventilation boxes result in larger occupied area, and the sludge is dried by hot air alone, the phenomenon that the sludge is stuck to the wall and the phenomenon that the sludge is crust easily occurs, so that the sludge drying effect is not ideal. CN109231764a invented a device for pretreating sludge by microwave and then reheating and drying sludge, but its structure is too complex, and the sludge not only needs to be subjected to microwave pretreatment, extrusion crushing and drying by different device distribution, but also has the advantages of complex process, long flow, large energy consumption and high equipment maintenance cost. CN206970445U discloses a sludge drying device which utilizes microwaves to make water molecules in sludge vibrate fast to generate heat to accelerate evaporation of water molecules, the device can make sludge evenly distributed to enhance microwave action effect, but simply drying sludge by microwaves can cause larger energy consumption, longer drying time, overhigh cost and easy microwave leakage risk for long-time action. CN209923168U discloses a sludge lime drying anti-sticking device, which breaks sludge lime into small particles by using a shoveling plate while drying the sludge lime, but the drying effect is still relatively low, the anti-sticking effect is still to be enhanced, the required energy consumption is large, and the carbon emission is too high. CN111238063a invented a solar fused salt energy-storage sludge and coal slime drying system, which heats lava drying sludge through a solar heat collector, but has lower heat exchange efficiency, is greatly affected by other factors, is relatively unstable, limits drying efficiency, and has larger limitation only when being mixed with coal slime.
Therefore, in order to solve the industrial problems of difficult drying, high energy consumption, low efficiency, high carbon emission and the like in the current sludge treatment, a set of method and device for continuously drying sludge with low energy consumption, low carbon and high efficiency are necessary to be researched.
Disclosure of Invention
Aiming at the industrial problems of difficult drying, high energy consumption, low efficiency, high carbon emission and the like in the prior sludge treatment, the invention provides a method and a device for continuously drying sludge with low carbon by using a pulsating fluidized heat carrier.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a device for continuously low-carbon drying sludge by using a pulsating fluidized heat carrier, the device comprising: the device comprises a tail gas treatment device, a fan, a separator, a microwave device, a feeding pipeline microwave device, a static pulsation dryer, a cutting device, a blocker, a three-way pipeline and a flue gas inlet;
the feeding pipeline is obliquely arranged on the side wall of the top of the static pulsation dryer, a feeding port is arranged at the top of the feeding pipeline, a feeding pipeline microwave device is arranged at the outer side of the feeding pipeline, the static pulsation dryer is divided into a plurality of sections, and a cutting device is arranged between the outlet of the feeding pipeline and the upper section of the static pulsation dryer and the middle section of the static pulsation dryer; the cutting device is used for cutting broken materials, so that energy consumption in a drying process is reduced; the static pulsation dryer is used for drying the cut sludge and sorting the heat carrier, the dry sludge and the wet sludge; meanwhile, the wall of the cleaner is assisted by a heat carrier, so that the dried sludge flies out of the dryer along with air flow, and wet sludge is continuously fluidized and dried in the dryer; the top of the static pulsation dryer is connected to the separator through a pipeline, and a microwave device is arranged on the pipeline of the static pulsation dryer and the pipeline of the separator, so that the sludge is further subjected to microwave drying, and the drying efficiency is improved; the method is used for realizing gas-solid separation while further drying the sludge; the top of the separator is connected with a fan, and the outlet of the fan is connected with a tail gas treatment device; the fan is used for creating an integral micro negative pressure environment which is beneficial to water evaporation in the static pulsation dryer, so as to strengthen wet sludge evaporation; the tail gas treatment device is used for purifying harmful gases entrained in the wet and hot flue gas so as to recycle and utilize the harmful gases. The bottom of the static pulsation dryer is communicated with the flue gas inlet through a three-way pipeline, and a blocking device is arranged between the static pulsation dryer and the three-way pipeline; the method is used for ensuring that the sludge is placed in an effective fluidization drying environment of a static pulsation dryer, and the drying efficiency is ensured.
Further, the internal grid size of the cutting device is 10-40 mm.
Further, the sectional area ratio of the sludge lifting circulation areas and the sludge descending circulation areas which are alternately and uniformly distributed in the static pulsation dryer is 0.3-0.9.
A method for continuously drying sludge with low carbon by using a device for continuously drying sludge with low carbon by using a pulsating fluidized heat carrier comprises the following steps:
step 1, adding a heat carrier into a static pulsation dryer, and introducing a heat carrier gas to enable the heat carrier to be in a high-temperature fluidization state;
step 2, the sludge enters a static pulsation dryer after being pretreated by microwaves at a feeding pipeline, so that moisture in the sludge is quickly evaporated to gaps among particles in a sludge cluster, and the viscosity of the sludge is reduced while the gasification of combined water is realized;
step 3, the sludge entering the static pulsation dryer is impacted and mixed with the heat carrier after being cut by the cutting device, and is continuously fluidized and dried, so that the separation of the heat carrier, dry sludge and wet sludge is realized while the wall adhesion in the drying process is reduced;
and 4, carrying out microwave treatment on the separated dry sludge by utilizing a microwave device and further strengthening drying by utilizing waste heat before entering the separator, realizing gas-solid separation in the separator, and enabling waste gas to enter a tail gas treatment device for treatment, so as to finally obtain the dried sludge.
Further, the sludge is mechanically press-filtered and has a water content of 70-85%.
Further, the type of the heat carrier is determined according to the subsequent recycling requirement, and the heat carrier can be limestone, gangue particles and the like, or dried sludge particles. The particle size of the heat carrier is 10 mm-50 mm, and the density is 1.2-3 times of that of the sludge;
further, the intensity of the microwaves acting on the sludge is 200W to 1200W, and the microwave acting time is about 1 to 4 seconds.
Further, the temperature of the hot carrier gas is 50 to 150 ℃.
Further, the equivalent diameter of the crushed sludge is 5 mm-30 mm.
Further, the particle size of the dried sludge is crushed to be 0.2 to 0.7 times of the original size, and the water content is 30 to 50 percent.
Compared with the prior art, the invention has the following advantages:
1) The invention skillfully utilizes the solid-solid heat transfer and the crushing of the heat carrier, effectively solves the frequent occurrence problem of the phenomenon of sticking the wall of the sludge in the sludge drying process, and reduces the maintenance cost of sludge drying equipment; cutting the massive sludge clusters, and improving the sludge drying efficiency; meanwhile, the method provides convenience for subsequent recycling of the sludge, and obviously reduces carbon emission in the whole sludge treatment process.
2) The hot gas used in the invention is low-temperature flue gas of a power plant, so that the drying energy consumption of the sludge can be effectively reduced, the drying cost of the sludge is reduced, the waste of resources is avoided, the utilization rate of the resources is improved, and the carbon emission in the drying process is reduced.
3) The invention reasonably uses the principle of pulsating air flow separation, not only realizes the rapid separation of the sludge and the heat carrier and promotes the drying process, but also solves the problem of dynamic separation of dry and wet sludge, realizes continuous drying of the sludge, improves the drying efficiency, greatly reduces the energy consumption required for drying the sludge, reduces the carbon emission in the drying process, simplifies the sludge drying process flow, and reduces the equipment construction and maintenance cost.
Drawings
FIG. 1 is a flow chart of a process for continuously drying sludge by using pulsating fluidized heat carrier enhanced microwaves and hot air;
FIG. 2 is a cross-sectional view of a split pipe section connection in a static pulsating dryer;
fig. 3 is a top view of the cutting device.
Reference numerals:
1. a tail gas treatment device; 2. a blower; 3. a separator; 4. a microwave device; 5. a feed conduit; 6. a feed line microwave device; 7. a static pulsating dryer; 8. a cutting device; 9. a blocker; 10. a three-way pipe; 11. a flue gas inlet.
Detailed Description
The invention is further illustrated by the following in connection with specific examples. These examples are provided only for illustrating the present invention and are not to be construed as limiting the scope of the present invention. The test methods in the following examples, in which specific conditions are not specified, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. All percentages and parts thereof are by weight unless otherwise indicated.
Example 1
A device for continuously low-carbon drying sludge by using a pulsating fluidized heat carrier, the device comprising: the device comprises a tail gas treatment device 1, a fan 2, a separator 3, a microwave device 4, a feeding pipeline 5, a feeding pipeline microwave device 6, a static pulsation dryer 7, a cutting device 8, a blocker 9, a three-way pipeline 10 and a flue gas inlet 11;
the feeding pipeline 5 is obliquely arranged on the side wall of the top of the static pulsation dryer 7, a feeding port is arranged at the top of the feeding pipeline 5, a feeding pipeline microwave device 6 is arranged at the outer side of the feeding pipeline 5, the static pulsation dryer 7 is divided into a plurality of sections, and a cutting device 8 is arranged between the outlet of the feeding pipeline and the upper section of the static pulsation dryer 7 and the middle section of the static pulsation dryer 7; the cutting device 8 is used for cutting broken materials, so that energy consumption in a drying process is reduced; the static pulsation dryer 7 is used for drying the cut sludge and sorting the heat carrier, the dry sludge and the wet sludge; meanwhile, the wall of the cleaner is assisted by a heat carrier, so that the dried sludge flies out of the dryer along with air flow, and wet sludge is continuously fluidized and dried in the dryer; the top of the static pulsation dryer 7 is connected to the separator 3 through a pipeline, and a microwave device 4 is arranged on the pipelines of the static pulsation dryer 7 and the separator 3, so that the sludge is further subjected to microwave drying, and the drying efficiency is improved; the separator 3 is used for realizing gas-solid separation while further drying the sludge; the top of the separator 3 is connected with a fan 2, and the outlet of the fan 2 is connected with a tail gas treatment device 1; the fan 2 is used for creating an integral micro negative pressure environment which is beneficial to water evaporation in the static pulsation dryer and strengthening wet sludge evaporation; the tail gas treatment device 1 is used for purifying harmful gases entrained in wet and hot flue gas so as to recycle and utilize the harmful gases. The bottom of the static pulsation dryer 7 is communicated with a flue gas inlet 11 through a three-way pipeline 10, and a blocking device 9 is arranged between the static pulsation dryer 7 and the three-way pipeline 10; the method is used for ensuring that the sludge is placed in an effective fluidization drying environment of a static pulsation dryer, and the drying efficiency is ensured.
Example 2
In a sludge continuous drying process with a treatment capacity of 200kg/h, as shown in fig. 2, a method for continuously drying sludge with low carbon (drying sludge by using hot flue gas of a power plant) is performed by adopting the device for continuously drying sludge with low carbon by using a pulsating fluidized heat carrier in embodiment 1, wherein the sludge is sludge with a water content of 80% after mechanical press filtration, the microwave intensity is 600W, and the microwave action time is 3 seconds. The equivalent diameter of the crushed sludge is 20mm on average, and the working temperature of hot air is 100 ℃.
Step 1, adding a heat carrier (limestone with the particle size of 10-50 mm and the density of 1.2-3 times of sludge) into a static pulsation dryer 7, starting a fan 2 to enable hot carrier gas-flue gas to enter the static pulsation dryer 7 through a flue gas inlet (11), and creating a micro negative pressure fluidization heat environment which is beneficial to sludge drying in the static pulsation dryer 7; the heat carrier (limestone) is in a high-temperature fluidization state;
step 2, the sludge is subjected to microwave pretreatment by a microwave device 4 at a feeding pipeline 5 and then enters a static pulsation dryer 7, so that moisture in the sludge is quickly evaporated to gaps among particles in a sludge cluster, and the viscosity of the sludge is reduced while the gasification of combined water is realized;
step 3, entering a static pulsation dryer 7, cutting into sludge clusters with unequal particle sizes of 5-20 mm through a cutting device 8 in a micro negative pressure thermal environment, (realizing the independent crushing of sludge for many times, facilitating the rapid diffusion of internal evaporation moisture to the particle surfaces of the sludge clusters, reducing drying energy consumption.) after preliminary crushing, the sludge clusters firstly fall onto a barrier 9 at the bottommost part of the static pulsation dryer 7, and after the collision and mixing of fine sludge clusters and a heat carrier are formed by means of the auxiliary crushing and drying of the pulsation of a heat carrier gas, fluidization drying is continuously carried out, and the wall sticking in the drying process is reduced until the drying requirement is basically met, and the separation of the heat carrier, dry sludge and wet sludge is completed;
and 4, carrying out microwave and further strengthening drying by utilizing waste heat by utilizing a microwave device 4 before the separated dry sludge enters the separator 3, realizing gas-solid separation in the separator 3, drying by utilizing the waste heat, and enabling the waste gas to enter the tail gas treatment device 1 for treatment, so as to finally obtain the dried sludge.
Wherein, the sectional area ratio of the sludge lifting circulation area and the sludge descending circulation area which are alternately and uniformly distributed in the static pulsation dryer 7 is 0.7.
The average water content of the sludge discharged from the separator is reduced from 80% to 35%, the sludge aggregate volume is reduced to 0.4 times of the original sludge aggregate volume, the average sludge aggregate size is 25mm after the primary crushing by the cutting device, and the blocking device successfully blocks 92% of sludge aggregates.
Example 3
In a sludge continuous drying process with a treatment capacity of 200kg/h, the device for continuously drying the sludge with low carbon by using the pulsating fluidized heat carrier in the embodiment 1 is adopted to carry out a method for continuously drying the sludge with low carbon, wherein the sludge is mechanically press-filtered and has a water content of 85%, the microwave intensity is 200W, and the microwave action time is 2 seconds. The equivalent diameter of the crushed sludge is 20mm on average, and the working temperature of hot carrier gas (hot flue gas) is 100 ℃. The average water content of the sludge discharged from the separator is reduced from 85% to 45% by coal gangue particles with the median particle diameter of 10mm in the heat carrier.
Example 4
In a sludge continuous drying process with a treatment capacity of 200kg/h, the device for continuously drying the sludge with low carbon by using the pulsating fluidized heat carrier in the embodiment 1 is adopted to carry out a method for continuously drying the sludge with low carbon, wherein the sludge is sludge with a water content of 73% after mechanical filter pressing, the microwave intensity is 1000W, and the microwave action time is 4 seconds. The equivalent diameter of the crushed sludge is 10mm on average, and the working temperature of hot carrier gas (hot air) is 120 ℃. The average water content of the dried sludge particles with the median particle diameter of 30mm in the heat carrier is reduced from 73% to 15% in the sludge discharged from the separator.
Example 5
In a sludge continuous drying process with a treatment capacity of 200kg/h, the device for continuously drying the sludge with low carbon by using the pulsating fluidized heat carrier in the embodiment 1 is adopted to carry out a method for continuously drying the sludge with low carbon, wherein the sludge is sludge with a water content of 73% after mechanical filter pressing, the microwave intensity is 800W, and the microwave action time is 2 seconds. The equivalent diameter of the crushed sludge is 25mm on average, and the working temperature of hot carrier gas (hot air) is 70 ℃. The average water content of the dried sludge particles with the median particle diameter of 50mm in the heat carrier is reduced from 73% to 28% in the sludge discharged from the separator.
What is not described in detail in the present specification belongs to the prior art known to those skilled in the art. While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (10)
1. A device for continuously drying sludge with low carbon by a pulsating fluidized heat carrier is characterized in that: the device comprises: the device comprises a tail gas treatment device (1), a fan (2), a separator (3), a microwave device (4), a feeding pipeline (5), a feeding pipeline microwave device (6), a static pulsation dryer (7), a cutting device (8), a blocker (9), a three-way pipeline (10) and a smoke inlet (11);
the feeding pipeline (5) is obliquely arranged on the side wall of the top of the static pulsation dryer (7), a feeding port is formed in the top of the feeding pipeline (5), a feeding pipeline microwave device (6) is arranged on the outer side of the feeding pipeline (5), the static pulsation dryer (7) is divided into a plurality of sections, and a cutting device (8) is arranged between the outlet of the feeding pipeline (5) and the upper section of the static pulsation dryer (7) and the middle section of the static pulsation dryer (7); the top of the static pulsation dryer (7) is connected to the separator (3) through a pipeline, and a microwave device (4) is arranged on the pipeline of the static pulsation dryer (7) and the separator (3); the top of the separator (3) is connected with a fan (2), and an outlet of the fan (2) is connected with a tail gas treatment device (1); the bottom of the static pulsation dryer (7) is communicated with the flue gas inlet (11) through a three-way pipeline (10), and a blocking device (9) is arranged between the static pulsation dryer (7) and the three-way pipeline (10).
2. The apparatus for continuously low-carbon drying sludge by using pulsating fluidized heat carrier according to claim 1, wherein: the internal grid size of the cutting device (8) is 10-40 mm.
3. The apparatus for continuously low-carbon drying sludge by using pulsating fluidized heat carrier according to claim 1, wherein: the sectional area ratio of the sludge lifting and descending circulation areas alternately distributed in the static pulsation dryer (7) is 0.3-0.9.
4. A method for continuously low-carbon drying sludge by using the device for continuously low-carbon drying sludge by using the pulsating fluidized heat carrier as claimed in claim 1, which is characterized in that: the method comprises the following steps:
step 1, adding a heat carrier into a static pulsation dryer (7), and introducing a heat carrier gas to enable the heat carrier to be in a high-temperature fluidization state;
step 2, the sludge enters a static pulsation dryer (7) after being pretreated by microwaves at a feeding pipeline (5), so that moisture in the sludge is quickly evaporated to gaps among particles in a sludge cluster, and the viscosity of the sludge is reduced while the gasification of combined water is realized;
step 3, after the sludge entering the static pulsation dryer (7) is cut by the cutting device (8), the sludge collides with and is mixed with the heat carrier, fluidization drying is continuously carried out, and separation of the heat carrier, dry sludge and wet sludge is realized while wall sticking in the drying process is reduced;
and 4, carrying out microwave and further strengthening drying by utilizing a microwave device (4) before entering the separator (3) and combining waste heat on the separated dry sludge, realizing gas-solid separation in the separator (3), and enabling the waste gas to enter the tail gas treatment device (1) for treatment, so as to finally obtain the dried sludge.
5. The method for continuously drying sludge with low carbon according to claim 4, wherein: the water content of the sludge is 70-85%.
6. The method for continuously drying sludge with low carbon according to claim 4, wherein: the heat carrier is any one of limestone particles, gangue particles or dried sludge particles; the particle size of the heat carrier is 10 mm-50 mm, and the density is 1.2-3 times of that of the sludge.
7. The method for continuously drying sludge with low carbon according to claim 4, wherein: the intensity of the microwave acting on the sludge is 200W-1200W, and the acting time of the microwave is about 1-4 seconds.
8. The method for continuously drying sludge with low carbon according to claim 4, wherein: the temperature of the hot carrier gas is 50-150 ℃.
9. The method for continuously drying sludge with low carbon according to claim 4, wherein: the equivalent diameter of the crushed sludge is 5 mm-30 mm.
10. The method for continuously drying sludge with low carbon according to claim 4, wherein: the particle size of the dried sludge is crushed to be 0.2 to 0.7 times of the original size, and the water content is 30 to 50 percent.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116253490A (en) * | 2023-03-24 | 2023-06-13 | 山西大学 | Microwave and coal slime reinforced sludge continuous drying device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116253490A (en) * | 2023-03-24 | 2023-06-13 | 山西大学 | Microwave and coal slime reinforced sludge continuous drying device and method |
| CN116253490B (en) * | 2023-03-24 | 2024-05-28 | 山西大学 | Microwave and coal slime reinforced sludge continuous drying device and method |
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