CN116253490A - Microwave and coal slime reinforced sludge continuous drying device and method - Google Patents
Microwave and coal slime reinforced sludge continuous drying device and method Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 196
- 238000001035 drying Methods 0.000 title claims abstract description 109
- 239000003245 coal Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000010349 pulsation Effects 0.000 claims abstract description 46
- 230000003068 static effect Effects 0.000 claims abstract description 46
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 238000005520 cutting process Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000003250 coal slurry Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000007602 hot air drying Methods 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 18
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 6
- 238000002309 gasification Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 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
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
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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
- C02F11/131—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating using electromagnetic or ultrasonic waves
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Abstract
The invention discloses a continuous drying device and method for reinforced sludge by microwaves and coal slime, and belongs to the technical field of organic solid waste treatment. Aims at solving the industrial problems of difficult drying, high energy consumption, low efficiency, high carbon emission and the like in the prior sludge and coal slurry treatment. According to the invention, an integral micro negative pressure hot air drying environment is created in the static pulsation dryer, and a microwave drying and cutting crushing device is combined with the mixture of the sludge and the coal slime, so that moisture is quickly gasified, and the particle viscosity of the material clusters is reduced; the drying energy consumption is reduced; meanwhile, hot air dynamic drying is carried out to realize the separation of dry and wet sludge and coal slime; returning part of the dry sludge coal slime to the wet sludge coal slime, continuously drying in a static pulsation dryer, and discharging the dried sludge coal slime out of the static pulsation dryer along with hot air; and after microwave drying, gas-solid separation and coal slime and sludge separation are realized through a multistage separator, and finally dried sludge and coal slime are obtained.
Description
Technical Field
The invention belongs to the technical field of organic solid waste treatment, and particularly relates to a continuous drying device and method for microwave and coal slime reinforced sludge.
Background
Since 2015, the national town sewage treatment scale is greatly improved, the treatment rate reaches more than 95%, and the annual output of town sludge is also rapidly increased. The original sludge has high water content, and even though the original sludge is subjected to simple mechanical filter pressing, the sludge still has about 80% of water content, so that the volume of the original sludge is too large, the original sludge is sticky, and direct recycling and harmless treatment are difficult to realize. Therefore, before the final treatment of the sludge, the sludge is required to be dehydrated and dried, so that the accumulation 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. At present, a plurality of sludge drying devices exist, but part of the devices have the phenomenon of sludge wall sticking, so that the sludge drying efficiency is reduced, and the subsequent cleaning and maintenance cost is increased. The microwave and the coal slime are utilized to assist in drying the sludge, in the process, the coal slime can increase the penetrating power of the microwave, the inter-particle viscosity of the sludge aggregate can be effectively reduced, a water diffusion channel is established, and the water gasification is accelerated. Meanwhile, the sludge-coal-mud mixture is fluidized in a pulsating manner under the action of air flow, so that the wall adhesion of the sludge is reduced, the sludge is cut and crushed, the drying energy consumption is reduced, and the sludge low-carbon drying is realized.
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 and drying 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 heated unevenly, heat is conducted from outside to inside, and the phenomenon of crusting and the like easily occur outside the sludge, so that the sludge drying effect is influenced, 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.
CN 212051089U 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. CN 109231764a invented a device for pretreating sludge by microwave and then drying the sludge by hot air, 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. CN 206970445U 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. CN 209923168U 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. CN 111238063a invented a solar fused salt energy-storage sludge 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, and limits drying efficiency. CN 209322703U uses microwave hot air and high pressure machinery to dehydrate and dry sludge, so that the sludge drying efficiency is improved well, but in the whole process, sludge clusters are large in volume, steam is difficult to separate from sludge rapidly, the sludge drying method and equipment are complex, the maintenance and operation costs are high, and the energy consumption is high.
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 and coal slurry treatment, a set of method and device for continuously drying the sludge and the coal slurry with low energy consumption, low carbon and high efficiency are necessary to be researched.
Disclosure of Invention
Aiming at the difficult industrial problems of difficult drying, high energy consumption, low efficiency, high carbon emission and the like in the existing sludge and coal slime treatment, the invention provides a continuous drying device and method for microwave and coal slime reinforced sludge.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a microwave and coal slime reinforced sludge continuous drying device comprises a stirring tank, a fan, a gas purifier, a discharge pipeline provided with a microwave device, a multistage separator, a sludge and coal slime mixture feed pipeline provided with the microwave device, a static pulsation dryer, a cutting and crushing device, a blocking device, a three-way pipeline, a gas heater and an air inlet;
the bottom of the stirring tank is connected with a plurality of sludge-coal-slurry mixture feeding pipelines provided with microwave devices; the static pulsation dryer is divided into three sections, namely a dryer top, a dryer middle part and a dryer bottom, and cutting and crushing devices are respectively arranged among the mixture feeding pipeline outlet, the dryer top and the dryer middle part; the static pulsation dryer is used for drying and dynamically sorting the cut and crushed sludge coal slime, so that dry materials are discharged out of the dryer along with air flow, and wet materials are continuously fluidized and dried in the dryer; the cutting and crushing device is used for cutting and crushing wet sludge coal slime after microwave pretreatment, so that the energy consumption required by drying the sludge is reduced;
the tail end of a sludge-coal-mud mixture feeding pipeline provided with a microwave device is communicated with the side wall of the top of a dryer of the static pulsation dryer;
the top of the dryer is communicated with one side of a discharging pipeline provided with a microwave device, the other side of the discharging pipeline provided with the microwave device is tangentially communicated with the side wall of a multistage separator, and the multistage separator is used for separating dried sludge and coal slime and further drying materials by utilizing waste heat; the top of the multistage separator is communicated with a gas purifier, and the gas purifier is communicated with a fan; the fan is used for creating an overall micro negative pressure environment in the static pulsation dryer, so that evaporation and gasification of moisture in wet materials are facilitated;
the tail end of the static pulsation dryer is provided with a three-way pipeline, the bottom of the dryer is communicated with a pipeline opening on the three-way pipeline, and a blocking device is arranged between the bottom of the dryer and the three-way pipeline; one side of the three-way pipeline is communicated with the gas heater, and the gas heater is provided with an air inlet; the gas purifier is used for purifying harmful gases entrained in hot and humid air.
The microwave device arranged on the feeding pipeline of the sludge-coal-slurry mixture is used for carrying out microwave pretreatment on the sludge and the coal slurry, so that the moisture in the sludge-coal-slurry is gasified rapidly, the particle viscosity of the material clusters is reduced, the subsequent hot air drying is facilitated, and the carbon emission in the whole drying process is greatly reduced; the microwave device arranged on the discharging pipeline has the function of further reducing the water content of the material after hot air drying, and is convenient for the subsequent separator to crush and separate the coal slime sludge.
Further, the grid size in the cutting and crushing device is 10 mm-40 mm. Preferably, the grid size of the sludge cutting device is 20mm.
Further, the sectional area ratio of the sludge lifting and descending circulation areas alternately distributed in the static pulsation dryer is 0.5-0.9. Preferably, the sectional area ratio of the ascending and descending circulation areas of the sludge-coal-mud mixture alternately distributed in the static pulsation dryer is 0.6.
A continuous drying method for reinforced sludge by microwaves and coal slime comprises the following steps: firstly, mixing sludge and coal slime to obtain a mixture of the sludge and the coal slime, simultaneously creating an integral micro negative pressure hot air drying environment in a static pulsation dryer through a fan and a heater, and then carrying out microwave drying on the mixture of the sludge and the coal slime through a sludge coal slime mixture feeding pipeline provided with a microwave device, so that moisture in the sludge is quickly gasified, and meanwhile, the particle viscosity of a material cluster is reduced; the mixture of the sludge and the coal slime is crushed by a cutting and crushing device in a static pulsation dryer by utilizing gravity, so that water vapor in the material can be conveniently and rapidly diffused to the surfaces of sludge cluster particles, and the drying energy consumption is reduced; meanwhile, hot air dynamic drying is carried out to realize the separation of dry and wet sludge and coal slime; continuously drying the wet sludge coal slime in a static pulsation dryer, and discharging the dried sludge coal slime out of the static pulsation dryer along with hot air; and (3) further microwave drying the materials discharged from the static pulsation dryer at a discharge pipeline, and then realizing gas-solid separation and coal slime and sludge separation through a multi-stage separator, thereby finally obtaining dried sludge and coal slime.
Further, the sludge is sludge with water content of 70-85% after mechanical filter pressing, the coal slime is coal slime with water content of 40-60% after washing, and the weight ratio of the mixed sludge and the coal slime is 0.1-10. The preferable water content of the sludge is 80%; the water content of the coal slime is 45%; the microwave intensity was 400W and the microwave action time was about 2 seconds.
Further, the microwave intensity acting on the sludge coal slime is 200-1200W, and the microwave acting time is 1-4 s.
Further, the equivalent diameter of the cut and crushed sludge coal slime is 10 mm-40 mm, and the working temperature of the dried hot air is 50-120 ℃. Preferably, the equivalent diameter of the crushed sludge coal slime mass is 25mm, and the working temperature of the hot air for drying is 80 ℃.
Further, the particle size of the dried sludge coal slime is crushed to be 0.01 to 0.5 times of the original size, and the water content is 20 to 40 percent. Preferably, the particle size of the dried sludge is 0.3 times of the original size, and the water content is 35%.
Compared with the prior art, the invention has the following advantages:
1) The invention skillfully utilizes the fact that the moisture dielectric constant in the sludge coal slurry is higher, has higher wave absorbing capacity, and can efficiently convert microwave energy into heat energy at the initial stage of microwave action. Meanwhile, carbon in the coal slime has larger dielectric loss, and can quickly improve the temperature of the sludge coal slime mass in the later stage of the microwave action, thereby improving the water gasification rate of the sludge coal slime mass.
2) The advantages of low surface viscosity and good sphericity of the particles of the coal slime are well utilized by fully mixing and drying the sludge and the coal slime, an effective moisture and steam diffusion channel can be formed in the drying process, and the whole micro negative pressure hot air drying environment is combined, so that the moisture and steam inside wet materials can be more favorably diffused to the surfaces of the material clusters, and the carbon emission in the drying process is reduced.
3) The invention reasonably uses the principle of pulsating gas flow separation, not only realizes the rapid separation of sludge and coal slime from steam and promotes the drying process, but also solves the problem of dynamic separation of dry and wet sludge and coal slime, realizes continuous drying of the sludge and coal slime, 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 microwave and coal slurry enhanced sludge continuous drying process according to one embodiment of the invention;
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 stirring tank; 2. a blower; 3. a gas purifier; 4. a discharge pipeline provided with a microwave device; 5. a multistage separator; 6. a sludge coal slurry mixture feeding pipeline provided with a microwave device; 7. a static pulsating dryer; 7-1 dryer top; 7-2, the middle part of the dryer; 7-3, the bottom of the dryer; 8. cutting and crushing devices; 9. a blocker; 10. a three-way pipe; 11. a gas heater; 12. and an air 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 microwave and coal slime reinforced sludge continuous drying device comprises a stirring tank 1, a fan 2, a gas purifier 3, a discharging pipeline 4 provided with a microwave device, a multistage separator 5, a sludge and coal slime mixture feeding pipeline 6 provided with a microwave device, a static pulsation dryer 7, a cutting and crushing device 8, a blocking device 9, a three-way pipeline 10, a gas heater 11 and an air inlet 12.
The bottom of the stirring tank 1 is connected with two sludge-coal-mud mixture feeding pipelines 6 provided with microwave devices;
the static pulsation dryer 7 is divided into three sections, namely a dryer top 7-1, a dryer middle 7-2 and a dryer bottom 7-3, and a cutting and crushing device 8 is respectively arranged among the outlet of the mixture feeding pipeline 6, the dryer top 7-1 and the dryer middle 7-2; the static pulsation dryer 7 is used for drying and sorting the cut and crushed sludge coal slime, so that dry materials are discharged out of the dryer along with air flow, and wet materials are continuously fluidized and dried in the dryer; the cutting and crushing device 8 is used for cutting and crushing wet sludge coal slime after microwave pretreatment, so that the diffusion distance of water vapor in the material after the microwave action is reduced, and the energy consumption required for drying the sludge is reduced;
the tail end of a sludge-coal-slurry mixture feeding pipeline 6 provided with a microwave device is communicated with the side wall of the dryer top 7-1 of the static pulsation dryer 7;
the top 7-1 of the dryer is communicated with one side of a discharging pipeline 4 provided with a microwave device, the other side of the discharging pipeline 4 provided with the microwave device is tangentially communicated with the side wall of a multistage separator 5, and the multistage separator is used for separating dried sludge coal slime and further drying materials by utilizing waste heat; the top of the multistage separator 5 is communicated with the gas purifier 3, and the gas purifier 3 is communicated with the fan 2; the fan is used for creating an overall micro negative pressure environment in the static pulsation dryer, so that evaporation and gasification of moisture in wet materials are facilitated;
a three-way pipeline 10 is arranged at the tail end of the static pulsation dryer 7, the dryer bottom 7-3 is communicated with a pipeline opening on the three-way pipeline 10, and a blocking device 9 is arranged between the dryer bottom 7-3 and the three-way pipeline 10; one side of the three-way pipeline 10 is communicated with the gas heater 11, and the gas heater 11 is provided with an air inlet 12; the gas purifier is used for purifying harmful gases entrained in hot and humid air.
The microwave device is used for carrying out microwave pretreatment on the sludge and the coal slime, so that the moisture in the sludge and the coal slime is gasified rapidly, the particle viscosity of the material clusters is reduced, the subsequent hot air drying is facilitated, and the carbon emission in the whole drying process is greatly reduced.
Further, the grid size in the cutting and crushing device 8 is 10 mm-40 mm.
Further, the sectional area ratio of the sludge lifting and descending circulation areas alternately distributed in the static pulsation dryer 7 is 0.5-0.9.
Example 2
In a sludge continuous drying process with a treatment capacity of 600kg/h, the sludge was continuously dried by using the microwave and coal slime reinforced sludge continuous drying device of example 1 according to the following method.
The sludge and coal slurry mixture with the weight ratio of 1 after full stirring and pretreatment enters a static pulsation dryer, the water content of the sludge and the coal slurry is 76%, the microwave intensity is 600W, and the microwave action time is 3 seconds. The equivalent diameter of the cut and crushed sludge is 20mm on average, and the working temperature of hot air is 90 ℃.
Starting a fan 2, heating air through an air inlet 12 connected with a gas heater 11, then entering a static pulsation dryer 7 to create a micro negative pressure thermal environment, simultaneously feeding a sludge coal slurry mixture stirred according to a certain proportion into the static pulsation dryer 7 through a stirring tank 1 from the outside by adding a feeding pipeline 6 provided with a microwave device, carrying out microwave pretreatment on materials through the microwave device, so that moisture in the sludge is gasified rapidly, and meanwhile, the particle viscosity of the material is reduced; wherein the feed inlet at the end of the feed pipe is vertically downward; under the micro negative pressure thermal environment, the mixture of the sludge and the coal slime is automatically crushed into sludge coal slime balls with the particle size of 30-40 mm in a static pulsation dryer 7 through a cutting and crushing device 8 by utilizing gravity, so that the evaporated moisture in the materials can be conveniently and rapidly diffused to the particle surfaces of the sludge balls, and the drying energy consumption is reduced; the sludge coal slime is firstly dropped onto a blocking device 9 at the bottommost part of the static pulsation dryer after preliminary cutting and crushing, then assisted crushing and drying of hot air pulsation are realized by means of hot air, tiny sludge balls are formed to be pulsation dried in the static pulsation dryer until the drying requirement is basically met, the materials discharged from the static pulsation dryer are further subjected to microwave drying at a discharge pipeline 4, and then gas-solid separation and coal slime and sludge separation are realized by a multistage separator 5, and finally dried sludge and coal slime are obtained.
The device for continuously drying the sludge is reinforced by microwaves and coal slime, the water content of the sludge-coal slime mixture discharged from the multistage separator is reduced from 76% to 36% on average, the sludge group volume is reduced to 0.4 times of the original sludge group volume on average, the average sludge granule diameter is 25mm after the sludge is primarily crushed by the cutting and crushing device, the blocking device successfully blocks 91% of sludge clusters, and the inside of the static pulsation dryer is kept basically clean.
Example 3
In a sludge continuous drying process with a treatment capacity of 600kg/h, the sludge was continuously dried by using the microwave and coal slime reinforced sludge continuous drying device of example 1 according to the following method. The water content of the sludge is 76%, the microwave intensity is 1000W, and the microwave action time is 4s; the equivalent diameter of the cut and crushed sludge coal slime is 30 mm-40 mm, and the working temperature of the dried hot air is 120 ℃. The device for continuously drying the sludge is reinforced by microwaves and coal slime, the water content of the sludge-coal slime mixture discharged from the multistage separator is reduced from 76% to 20% on average, the sludge group volume is reduced to 0.01-0.5 times of the original sludge group volume on average, after the sludge is primarily crushed by the cutting and crushing device, the average particle size of the sludge group is reduced to 20mm after the sludge is secondarily crushed, the blocking device successfully blocks 91% of the sludge group, and the inside of the static pulsation dryer is kept basically clean.
Example 4
In a continuous sludge drying process with a treatment capacity of 300kg/h, the continuous sludge drying device with the microwave and coal slime reinforcement of the embodiment 1 is used for continuously drying the sludge according to the following method. The water content of the coal slime and sludge mixture is 70%, the microwave intensity is 1200W, and the microwave action time is 2s; the equivalent diameter of the cut and crushed sludge coal slime is 10 mm-20 mm, and the working temperature of the hot air for drying is 100 ℃. 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 0.6. By using a device for continuously drying the sludge by using microwaves and coal slime, the water content of the sludge-coal slime mixture discharged from the multi-stage separator is reduced from 70% to 16% on average, and the average sludge granule diameter is 12mm.
Example 5
In a continuous sludge drying process with a treatment capacity of 300kg/h, the continuous sludge drying device with the microwave and coal slime reinforcement of the embodiment 1 is used for continuously drying the sludge according to the following method. The water content of the sludge-coal-slurry mixture is 80%, the microwave intensity is 200W, and the microwave action time is 2s; the equivalent diameter of the cut and crushed sludge coal slime is 30 mm-40 mm, and the working temperature of the dried hot air is 80 ℃. 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 0.9. By using a device for continuously drying the sludge by using microwaves and coal slime, the water content of the sludge-coal slime mixture discharged from the multi-stage separator is reduced from 80% to 35% on average, and the sludge aggregate size is 30mm on average.
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 (8)
1. A continuous desiccation device of mud is reinforceed to microwave, coal slime, its characterized in that: the device comprises a stirring tank (1), a fan (2), a gas purifier (3), a discharge pipeline (4) provided with a microwave device, a multi-stage separator (5), a sludge coal slime mixture feeding pipeline (6) provided with the microwave device, a static pulsation dryer (7), a cutting and crushing device (8), a blocking device (9), a three-way pipeline (10), a gas heater (11) and an air inlet (12);
the bottom of the stirring tank (1) is connected with a plurality of sludge-coal-slurry mixture feeding pipelines (6) provided with microwave devices, the static pulsation dryer (7) is divided into three sections, namely a dryer top (7-1), a dryer middle part (7-2) and a dryer bottom (7-3), and cutting and crushing devices (8) are respectively arranged among the outlets of the mixture feeding pipelines (6), the dryer top (7-1) and the dryer middle part (7-2); the tail end of a sludge-coal-mud mixture feeding pipeline (6) provided with a microwave device is communicated with the side wall of the dryer top (7-1) of the static pulsation dryer (7); the top part (7-1) of the dryer is communicated with one side of a discharging pipeline (4) provided with a microwave device, the other side of the discharging pipeline (4) provided with the microwave device is tangentially communicated with the side wall of a multistage separator (5), the top part of the multistage separator (5) is communicated with a gas purifier (3), and the gas purifier (3) is communicated with a fan (2); the tail end of the static pulsation dryer (7) is provided with a three-way pipeline (10), the bottom (7-3) of the dryer is communicated with a pipeline port on the three-way pipeline (10), and a blocking device (9) is arranged between the bottom (7-3) of the dryer and the three-way pipeline (10); one side of the three-way pipeline (10) is communicated with the gas heater (11), and an air inlet (12) is formed in the gas heater (11).
2. The continuous microwave and coal slime reinforced sludge drying device according to claim 1, wherein the device comprises: the grid size in the cutting and crushing device (8) is 10 mm-40 mm.
3. The continuous microwave and coal slime reinforced sludge drying device according to claim 1, wherein the device comprises: the sectional area ratio of the sludge lifting circulation areas alternately distributed in the static pulsation dryer (7) is 0.5-0.9.
4. A continuous drying method for strengthening sludge by microwaves and coal slime is characterized in that: the method comprises the following steps:
firstly, mixing sludge and coal slime to obtain a mixture of the sludge and the coal slime, simultaneously creating an integral micro-negative pressure hot air drying environment in a static pulsation dryer (7) through a fan (2) and a heater (3), then carrying out microwave pretreatment on the mixture of the sludge and the coal slime through a sludge-coal slime mixture feeding pipeline (6) provided with a microwave device, and then crushing the mixture of the sludge and the coal slime in the static pulsation dryer (7) by a cutting and crushing device (8) by utilizing gravity, and then carrying out hot air dynamic drying and simultaneously realizing the separation of dry sludge and wet sludge coal slime; continuously drying the wet sludge coal slime in a static pulsation dryer (7), and discharging the dried sludge coal slime out of the static pulsation dryer along with hot air; and the materials discharged from the static pulsation dryer are subjected to further microwave drying at a discharge pipeline (4) and then are subjected to gas-solid separation and coal slime and sludge separation through a multistage separator (5), and finally dried sludge and coal slime are obtained.
5. The continuous drying method of the microwave and coal slime reinforced sludge, which is characterized in that: the water content of the sludge is 70-85%, the water content of the coal slime is 40-60%, and the weight ratio of the sludge to the coal slime is 0.1-10.
6. The continuous drying method of the microwave and coal slime reinforced sludge, which is characterized in that: the microwave intensity acting on the sludge coal slime is 200W-1200W, and the microwave acting time is 1 s-4 s.
7. The continuous drying method of the microwave and coal slime reinforced sludge, which is characterized in that: the equivalent diameter of the cut and crushed sludge coal slime is 10 mm-40 mm, and the working temperature of the dried hot air is 50-120 ℃.
8. The continuous drying method of the microwave and coal slime reinforced sludge, which is characterized in that: the particle size of the dried sludge coal slime is crushed to be 0.01-0.5 times of the original size, and the water content is 20% -40%.
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