CN114057371A - Sludge drying treatment method based on particle heat source - Google Patents
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- CN114057371A CN114057371A CN202010758520.4A CN202010758520A CN114057371A CN 114057371 A CN114057371 A CN 114057371A CN 202010758520 A CN202010758520 A CN 202010758520A CN 114057371 A CN114057371 A CN 114057371A
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- 239000010802 sludge Substances 0.000 title claims abstract description 188
- 238000001035 drying Methods 0.000 title claims abstract description 112
- 239000002245 particle Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 238000012216 screening Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims description 132
- 239000007787 solid Substances 0.000 claims description 58
- 229910000831 Steel Inorganic materials 0.000 claims description 44
- 239000010959 steel Substances 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000011363 dried mixture Substances 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 9
- 238000012546 transfer Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 241000700605 Viruses Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001070941 Castanea Species 0.000 description 1
- 235000014036 Castanea Nutrition 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001599 direct drying Methods 0.000 description 1
- 238000002036 drum drying Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000002470 thermal conductor Substances 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A sludge drying treatment method based on a particle heat source comprises the following steps: 1) manufacturing a particle heat source; 2) screening a particle heat source; 3) sludge drying 4) separating granular sludge. The invention utilizes the direct mixing contact of the particle heat source and the sludge, achieves the effect of drying the sludge through mass transfer and heat transfer, greatly increases the heat exchange area, fully utilizes the waste heat and improves the drying efficiency.
Description
Technical Field
The invention relates to a solid waste treatment/sludge drying technology, in particular to a sludge drying treatment method based on a particle heat source.
Background
With the economic development and the rapid growth of urban population, the treatment rate of industrial and urban sewage is continuously improved, the sludge quantity of sewage treatment plants is increased day by day, the sludge treatment technology is relatively lagged behind, the phenomenon of sludge enclosing city is more and more serious, and sludge drying is a necessary link for realizing sludge harmlessness, reduction and recycling. The water content of sludge from a sewage treatment plant is generally between 75 and 85 percent through mechanical dehydration, and if the water content of the sludge is reduced to be below 20 percent, the conventional sludge drying technology usually adopts an electric heating or steam heating mode, so that a large amount of energy is consumed, and the sludge drying cost is high.
Meanwhile, as a big iron and steel country in China, the annual steel production is close to 10 hundred million tons, the annual steel and iron slag production is over 2 million tons, the heat energy contained in each ton of slag is equivalent to 60 kilograms of standard coal, the slag is a poor thermal conductor, the waste heat recovery of the slag is slow, the existing slag treatment adopts a water quenching process, and a great amount of heat energy is wasted. In order to solve the problem that the sludge treatment is influenced by high cost of traditional sludge drying, and the waste heat of the steel slag cannot be effectively utilized, a process route and an implementation method for drying the sludge by using the waste heat of the metallurgical slag are provided.
The sludge drying technology comprises the following steps: for example, Chinese patent CN200510048978.6 utilizes waste heat of a boiler, Chinese patents CN200510049554.1 and CN200510049556.0 utilize waste heat of flue gas of a power plant, and Chinese patent CN200410052759.0 discloses a reflux type temperature-controllable sludge drying device and a method, which mix dried sludge with wet sludge by reflux with the particle size of more than 4 mm, cut the sludge into smaller blocks by a steel wire mesh, and then enter a rotary kiln, so that the subsequent hot air drying efficiency can be improved, but the subsequent hot air drying efficiency cannot be realized when the water content of the sludge is too high. The chinese patent CN03155966.2 adopts a negative pressure sealing manner, which can cut off the outward transmission and spreading channels of various viruses generated during the sludge treatment process, and simultaneously avoid the leakage and transmission of the polluted air and the carried viruses in the system space to the outside during the moving process of the system, but because all process devices are concentrated in the moving equipment, the processing capacity is necessarily relatively low, and the continuous operation cannot be realized.
Disclosure of Invention
The invention aims to provide a sludge drying treatment method based on a particle heat source, which can effectively save energy consumption and reduce sludge drying cost by quickly drying sludge by utilizing solid particle heat (such as steel slag waste heat) with certain particle size requirements.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a sludge drying treatment method based on a particle heat source comprises the following steps:
1) granular heat source production
The particle heat source adopts a slag treatment roller to granulate molten steel slag in a steel plant to obtain hot solid slag with Mohs hardness of 3-8;
2) particle heat source screening
After a particle heat source is generated, the particle heat source is conveyed into a screening device through a heat preservation conveying device to obtain hot solid slag, wherein the ratio of the median particle size (D50) to the median particle size of dried sludge is 10-100, and the ratio of the minimum value of the particle size of the hot solid slag to the maximum value of the particle size of the dried sludge is 2-10;
3) sludge drying
Conveying the screened particle heat source to a sludge drying device through a heat preservation conveying device; meanwhile, the sludge to be dried is conveyed to a sludge drying device through a sludge conveying device, and the processes of mixing, stirring and drying the granular heat source and the sludge are completed in the sludge drying device; the mass ratio of the particle heat source to the sludge is 1.0-10.0, the mixing and stirring time is 1-10 min, and the sludge drying time is 5-40 min;
4) granular sludge separation
And discharging the dried mixture of the granular heat source and the sludge by a sludge drying device, separating the granular heat source and the sludge by a screening device, and respectively sending the granular heat source and the sludge to corresponding storage bins to realize subsequent resource utilization.
Preferably, the hardness of the hot solid slag is as follows: the Mohs hardness is 5-7.
Preferably, the degree of mixing, i.e., the degree of mixing, of the granular heat source and the sludge after the agitation and mixing is evaluated by the vertical fluctuation range based on the mass ratio of the granular heat source to the sludge, and the fluctuation range is-15% to 15%.
Preferably, the fluctuation range is-5% to 5%.
Preferably, the molten steel slag includes blast furnace slag, molten iron desulphurization slag, converter slag, electric furnace slag or casting residue.
The hot steel slag as the large amount of solid waste in steel plant includes blast furnace slag, molten iron desulfurizing slag, converter slag, electric furnace slag, casting slag, etc. and these slag need to be cooled from molten state to solid state. At present, the competitive slag treatment method in the market, no matter the roller method, the hot stewing method or the air quenching method, needs to adopt special equipment, cools and solidifies the slag in a water cooling mode, has low waste heat utilization efficiency and even can not be utilized. Therefore, the solidified hot steel slag is used as a particle heat source to be combined with sludge, and a drum drying mode is adopted, so that a set of sludge drying treatment method based on the particle heat source is formed.
The sludge drying treatment method comprises the following steps:
the granular heat source is hot steel slag (solid state) obtained by physicochemical treatment and screening of steel plant slag (molten steel slag) according to the requirements of a sludge drying process by adopting a slag treatment roller.
As a particle heat source adopted by a sludge drying process, the hardness requirement of the hot steel slag is determined according to subsequent stirring, mixing and drying modes, so that the crushing and pulverization degree of the hot steel slag in the stirring, mixing and drying processes is controlled, and the mutual pollution degree of the steel slag and sludge is controlled.
After the particle heat source is generated, the particle heat source is conveyed into a screening device through a high-temperature conveying device, and the particle heat source meeting the sludge drying requirement in the particle size range is obtained.
The granular heat source needs to be stirred and mixed with the sludge after being screened so as to facilitate the subsequent slag-sludge separation. The screening of the hot steel slag meets the requirement of the particle size, namely the ratio of the median particle size (D50) to the median particle size of the dried sludge is 10-100, and the ratio of the minimum particle size to the maximum particle size of the sludge is 2-10.
And (4) conveying the screened particle heat source to a particle heat source inlet of the sludge drying device through the heat-preservation conveying device, and then entering the sludge drying device. Meanwhile, the sludge to be dried is conveyed to a sludge inlet of the sludge drying device through the sludge conveying device and enters the sludge drying device. The stirring, mixing and drying processes of the particle heat source and the sludge are completed in the sludge drying device.
The mass ratio of the particles to the sludge related to the sludge drying process is an important means for adjusting and ensuring the sludge drying effect and the drying efficiency. The mass ratio of the particles to the sludge is generally selected within the range of 1.0-10.0, and is specifically determined according to factors such as target water content of the sludge, yield of dried sludge, yield of hot steel slag and the like, and preferably 2.0-5.0.
The mixing degree of the stirred and mixed granular heat source and the sludge, namely the mixing degree, is an important index influencing the sludge drying efficiency, and the upper and lower fluctuation ranges based on the mass ratio of the granules to the sludge are evaluated, wherein the optional fluctuation range is-15 to 15 percent, and the fluctuation range can be preferably-5 to 5 percent if the drying efficiency is strictly required. In order to ensure the mixing degree, the time required by stirring and mixing needs to be controlled, the stirring and mixing time is generally 1-10 min, and the sludge drying time is 5-40 min.
The invention has the beneficial effects that:
compared with the existing sludge drying technology utilizing tail gas heat sources of power plants and the like, the invention can efficiently utilize the residual heat of tail gas and solid slag in the slag roller treatment according to different requirements (target water content) aiming at the drying characteristics of organic sludge and the influence on the environment, adopts a close contact heat exchange mode similar to sugar-fried chestnut through the direct mixing contact of the granular heat source and the sludge, is obviously superior to the convection and heat radiation gas-solid heat exchange mode in the prior art, realizes the rapid, stable and continuous direct drying and slag-mud separation of the organic sludge, is beneficial to the subsequent resource utilization of granular slag and mud powder, and improves the added value of dry sludge. In the aspect of realizing process equipment, the invention utilizes the roller technology for treating the thermal-state steel slag, has low energy consumption, no additional pollution, simple structure and easy operation.
Drawings
FIG. 1 is a flow chart of sludge drying treatment based on a particle heat source.
Detailed Description
The invention is further illustrated by the following figures and examples.
The invention relates to a sludge drying treatment method based on a particle heat source, which comprises the following steps:
1) granular heat source production
The particle heat source adopts a slag treatment roller to granulate molten steel slag in a steel plant to obtain hot solid slag with Mohs hardness of 3-8;
2) particle heat source screening
After a particle heat source is generated, the particle heat source is conveyed into a screening device through a heat-preservation conveying device, the obtained hot solid slag has the particle size, the ratio of the median particle size (D50) to the median particle size of dried sludge is 10-100, and the ratio of the minimum value of the particle size of the hot solid slag to the maximum value of the particle size of the dried sludge is 2-10;
3) sludge drying
Conveying the screened particle heat source to a sludge drying device through a heat preservation conveying device; meanwhile, the sludge to be dried is conveyed to a sludge drying device through a sludge conveying device, and the processes of mixing, stirring and drying the granular heat source and the sludge are completed in the sludge drying device; the mass ratio of the particle heat source to the sludge is 1.0-10.0, the mixing and stirring time is 1-10 min, and the sludge drying time is 5-40 min;
4) granular sludge separation
And discharging the dried mixture of the granular heat source and the sludge by a sludge drying device, separating the granular heat source and the sludge by a screening device, and respectively sending the granular heat source and the sludge to corresponding storage bins to realize subsequent resource utilization.
Example 1
In the drying treatment process of converter fly ash (OG sludge) in a certain steel mill, as shown in figure 1, a particle heat source is hot solid slag which is obtained by a roller slag treatment process and meets the requirements, and the flow ratio of the slag sludge is controlled to be 2.0. 18 million tons of high-temperature steel slag are treated by a single roller device every year, hot solid slag is obtained after the treatment of the slag treatment roller, the temperature is controlled at 800 ℃, the median particle size (D50) is 5mm, the minimum particle size is 2mm, the Mohs hardness is 8, and the hot solid slag is conveyed into a solid drying roller through a heat-insulating conveying device. During the process of treating the steel slag, OG mud with the water content of 85 percent is pumped into a solid-solid drying roller by a sludge pump, and is scattered and then stirred and mixed with hot solid slag. And (3) fully mixing the hot solid slag and the OG sludge under the action of a roller propeller blade, and drying the sludge. The stirring and mixing time of the inlet section of the drying roller is controlled to be 10min, and the drying time of sludge of the drying section is controlled to be 10 min. The dried slag and sludge are conveyed into a vibrating screen through a discharge port through a spiral conveying device to complete slag and sludge separation, and the moisture content of the OG sludge is 6% and is conveyed into a raw material bin of the rotary hearth furnace through a gas conveying pipeline.
Example 2
In the OG sludge drying treatment process of a certain steel mill, as shown in figure 1, a particle heat source is hot solid slag which is obtained by a roller slag treatment process and meets the requirement, and the slag-sludge flow ratio is controlled to be 10.0. 18 million tons of high-temperature steel slag are treated by a single roller device every year, hot solid slag is obtained after the treatment of the slag treatment roller, the temperature is controlled at 800 ℃, the median particle size (D50) is 8mm, the minimum particle size is 2mm, the Mohs hardness is 3, and the hot solid slag is conveyed into a solid drying roller through a heat-preservation conveying device. During the process of treating the steel slag, OG mud with the water content of 85 percent is pumped into a solid-solid drying roller by a sludge pump, and is scattered and then stirred and mixed with hot solid slag. And (3) fully mixing the hot solid slag and the OG sludge under the action of a roller propeller blade, and drying the sludge. The stirring and mixing time of the inlet section of the drying roller is controlled to be 1min, and the drying time of sludge of the drying section is controlled to be 35 min. The dried slag and sludge are conveyed into a vibrating screen through a discharge port through a spiral conveying device to complete slag and sludge separation, and the moisture content of the OG sludge is 6% and is conveyed into a raw material bin of the rotary hearth furnace through a gas conveying pipeline.
Example 3
In the OG sludge drying treatment process of a certain steel mill, as shown in figure 1, a particle heat source is hot solid slag which is obtained by a roller slag treatment process and meets the requirement, and the flow ratio of the slag and the sludge is controlled to be 3.0. 18 million tons of high-temperature steel slag are treated by a single roller device every year, hot solid slag is obtained after the treatment of the slag treatment roller, the temperature is controlled at 800 ℃, the median particle size (D50) is 5mm, the minimum particle size is 2mm, the Mohs hardness is 5, and the hot solid slag is conveyed into a solid drying roller through a heat-insulating conveying device. During the process of treating the steel slag, OG mud with the water content of 85 percent is pumped into a solid-solid drying roller by a sludge pump, and is scattered and then stirred and mixed with hot solid slag. And (3) fully mixing the hot solid slag and the OG sludge under the action of a roller propeller blade, and drying the sludge. The stirring and mixing time of the inlet section of the drying roller is controlled to be 3min, and the drying time of sludge of the drying section is controlled to be 5 min. The dried slag and sludge are conveyed into a vibrating screen through a discharge port through a spiral conveying device to complete slag and sludge separation, and the moisture content of the OG sludge is 6% and is conveyed into a raw material bin of the rotary hearth furnace through a gas conveying pipeline.
Example 4
As shown in figure 1, a granular heat source of the drying treatment process of cold-rolled alkaline sludge in a certain steel mill is hot solid slag which meets the requirements and is obtained by a roller slag treatment process, and the flow ratio of the slag and the sludge is controlled to be 1.0. 18 million tons of high-temperature steel slag are treated by a single roller device every year, hot solid slag is obtained after the treatment of the slag treatment roller, the temperature is controlled to be 250 ℃, the median particle size (D50) is 8mm, the minimum particle size is 3mm, the Mohs hardness is 7, and the hot solid slag is conveyed into a solid drying roller through a heat-preservation conveying device. During the process of treating the steel slag, cold-rolled alkaline sludge with the water content of 85 percent is conveyed into a solid-solid drying roller by a sludge pump, and is scattered and then is stirred and mixed with hot solid slag. And (3) fully mixing the hot solid slag and the OG sludge under the action of a roller propeller blade, and drying the sludge. The stirring and mixing time of the inlet section of the drying roller is controlled to be 10min, and the drying time of sludge of the drying section is controlled to be 20 min. The dried slag and sludge are conveyed into a vibrating screen through a discharge port through a spiral conveying device to complete slag and sludge separation, the moisture content of the OG sludge can be controlled at 15%, and the separated slag and sludge respectively enter corresponding storage bins to wait for a truck to be conveyed to a user for use.
Example 5
As shown in figure 1, a granular heat source of the drying treatment process of cold-rolled alkaline sludge in a certain steel mill is hot solid slag which meets the requirements and is obtained by a roller slag treatment process, and the flow ratio of the slag and the sludge is controlled to be 10.0. 18 million tons of high-temperature steel slag are treated by a single roller device every year, hot solid slag is obtained after the treatment of the slag treatment roller, the temperature is controlled at 200 ℃, the median particle size (D50) is 5mm, the minimum particle size is 1mm, the Mohs hardness is 3, and the hot solid slag is conveyed into a solid drying roller through a heat-preservation conveying device. During the process of treating the steel slag, cold-rolled alkaline sludge with the water content of 90 percent is conveyed into a solid-solid drying roller by a sludge pump, and is scattered and then is stirred and mixed with hot solid slag. And (3) fully mixing the hot solid slag and the OG sludge under the action of a roller propeller blade, and drying the sludge. The stirring and mixing time of the inlet section of the drying roller is controlled to be 1min, and the drying time of sludge of the drying section is controlled to be 40 min. The dried slag and sludge are conveyed into a vibrating screen through a discharge port through a spiral conveying device to complete slag and sludge separation, the moisture content of the OG sludge can be controlled to be 10%, and the separated slag and sludge respectively enter corresponding storage bins to wait for a truck to be conveyed to a user for use.
Example 6
As shown in figure 1, a granular heat source of the drying treatment process of cold-rolled alkaline sludge in a certain steel mill is hot solid slag which meets the requirements and is obtained by a roller slag treatment process, and the flow ratio of the slag and the sludge is controlled to be 3.0. 18 million tons of high-temperature steel slag are treated by a single roller device every year, hot solid slag is obtained after the treatment of the slag treatment roller, the temperature is controlled to be 250 ℃, the median particle size (D50) is 5mm, the minimum particle size is 1mm, the Mohs hardness is 6, and the hot solid slag is conveyed into a solid drying roller through a heat-preservation conveying device. During the process of treating the steel slag, cold-rolled alkaline sludge with the water content of 85 percent is conveyed into a solid-solid drying roller by a sludge pump, and is scattered and then is stirred and mixed with hot solid slag. And (3) fully mixing the hot solid slag and the OG sludge under the action of a roller propeller blade, and drying the sludge. The stirring and mixing time of the inlet section of the drying roller is controlled to be 3min, and the drying time of sludge of the drying section is controlled to be 15 min. The dried slag and sludge are conveyed into a vibrating screen through a discharge port through a spiral conveying device to complete slag and sludge separation, the moisture content of the OG sludge can be controlled to be 20%, and the separated slag and sludge respectively enter corresponding storage bins to wait for a truck to be conveyed to a user for use.
In conclusion, the sludge drying process adopting the particle heat source achieves the effect of drying the sludge by directly mixing and contacting the particle heat source and the sludge through mass transfer and heat transfer, greatly increases the heat exchange area, and is a sludge drying process which fully utilizes the waste heat and improves the drying efficiency.
Claims (5)
1. A sludge drying treatment method based on a particle heat source is characterized by comprising the following steps:
1) granular heat source production
The particle heat source adopts a slag treatment roller to granulate molten steel slag in a steel plant to obtain hot solid slag with Mohs hardness of 3-8;
2) particle heat source screening
After a particle heat source is generated, the particle heat source is conveyed into a screening device through a heat preservation conveying device to obtain hot solid slag, wherein the ratio of the median particle size (D50) to the median particle size of dried sludge is 10-100, and the ratio of the minimum value of the particle size of the hot solid slag to the maximum value of the particle size of the dried sludge is 2-10;
3) sludge drying
Conveying the screened particle heat source to a sludge drying device through a heat preservation conveying device; meanwhile, the sludge to be dried is conveyed to a sludge drying device through a sludge conveying device, and the processes of mixing, stirring and drying the granular heat source and the sludge are completed in the sludge drying device; the mass ratio of the particle heat source to the sludge is 1.0-10.0, the mixing and stirring time is 1-10 min, and the sludge drying time is 5-40 min;
4) granular sludge separation
And discharging the dried mixture of the granular heat source and the sludge by a sludge drying device, separating the granular heat source and the sludge by a screening device, and respectively sending the granular heat source and the sludge to corresponding storage bins to realize subsequent resource utilization.
2. The sludge drying treatment method based on the granular heat source as claimed in claim 1, wherein the hardness of the hot solid slag is as follows: the Mohs hardness is 5-7.
3. The method of claim 1, wherein the degree of mixing of the granular heat source and the sludge after the stirring and mixing, i.e., the degree of mixing, is evaluated based on the upper and lower fluctuation ranges of the mass ratio of the granular heat source to the sludge, and the fluctuation range is-15% to 15%.
4. The method of claim 3, wherein the fluctuation range is-5% to 5%.
5. The granular heat source-based sludge drying treatment method as claimed in claim 1, wherein the molten steel slag comprises blast furnace slag, molten iron desulphurization slag, converter slag, electric furnace slag or casting residue.
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| CN117534291A (en) * | 2023-11-20 | 2024-02-09 | 浙江省环保集团北仑尚科环保科技有限公司 | A constant temperature equipment for melting sediment handles mud |
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