CN114057371B - Sludge drying treatment method based on particle heat source - Google Patents

Sludge drying treatment method based on particle heat source Download PDF

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Publication number
CN114057371B
CN114057371B CN202010758520.4A CN202010758520A CN114057371B CN 114057371 B CN114057371 B CN 114057371B CN 202010758520 A CN202010758520 A CN 202010758520A CN 114057371 B CN114057371 B CN 114057371B
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sludge
heat source
slag
drying
particle
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CN114057371A (en
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王英杰
肖永力
李永谦
谢梦芹
关运泽
顾秋生
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B3/00General features in the manufacture of pig-iron
    • C21B3/04Recovery of by-products, e.g. slag
    • C21B3/06Treatment of liquid slag
    • C21B3/08Cooling slag

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) granular sludge separation. The invention utilizes the direct mixed 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

Sludge drying treatment method based on particle heat source
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
Along 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, the sludge treatment technology is relatively backward, the phenomenon of sludge surrounding is more and more serious, and sludge drying is a necessary link for realizing sludge harmless, reduction and recycling. The water content of the sludge from a sewage treatment plant is generally 75-85% through mechanical dehydration, and if the water content of the sludge is reduced to below 20%, the conventional sludge drying technology usually adopts an electric heating or steam heating mode, so that a large amount of energy sources are required to be consumed, and the sludge drying cost is high.
Meanwhile, china is used as a large country of steel, annual steel production is close to 10 hundred million tons, steel slag generated each year exceeds 2 hundred million tons, heat energy contained in each ton of slag is equivalent to 60 kg of standard coal, the waste heat recovery of the slag is slow due to the fact that the slag is a bad heat conductor, the existing slag treatment adopts a water quenching process, and a large amount of heat energy is wasted. In order to solve the problem that the traditional sludge drying has high cost so as to influence sludge treatment and the waste heat of steel slag cannot be effectively utilized, a process route and an implementation method for drying the sludge by utilizing the waste heat of metallurgical slag are provided.
Sludge drying techniques such as: for example, chinese patent CN200510048978.6 uses waste heat of a boiler, chinese patent CN200510049554.1 and CN200510049556.0 use waste heat of flue gas of a power plant, chinese patent CN200410052759.0 discloses a reflux type temperature-controllable sludge drying device and method, which mix dried sludge with particle size larger than 4 mm with wet sludge, cut the sludge into smaller blocks by using a steel wire mesh and enter a rotary kiln, so that the efficiency of subsequent hot air drying can be improved, but the water content of the sludge is not realized when the water content of the sludge is too high. The Chinese patent CN03155966.2 adopts a negative pressure sealing mode, and can avoid the leakage and propagation of polluted air in a system space and the carried viruses to the outside in the moving process of the system while cutting off the outward propagation and spreading channels of various viruses generated in the sludge treatment process, but the treatment capacity of all process devices is relatively low due to the fact that all process devices are concentrated in the mobile equipment, and 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 utilizing solid particle heat (such as waste heat of steel slag) with certain particle size requirements to rapidly dry sludge.
In order to achieve the above 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) Particle heat source production
The granular heat source adopts a slag treatment roller to carry out granulation treatment on molten steel slag of a steel plant to obtain hot solid slag, wherein the hot solid slag has Mohs hardness of 3-8;
2) Particle heat source screening
After the particle heat source is generated, the particle heat source is sent into a screening device through a heat preservation conveying device to obtain hot solid slag, wherein the ratio of the median particle diameter (D50) to the median particle diameter of the dried sludge is 10-100, and the ratio of the minimum particle diameter of the hot solid slag to the maximum particle diameter of the dried sludge is 2-10;
3) Sludge drying
The sieved particle heat source is sent to a sludge drying device through a heat preservation conveying device; meanwhile, the sludge to be dried is sent to a sludge drying device through a sludge conveying device, and the mixing, stirring and drying processes of the particle 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) Separation of granular sludge
And discharging the dried mixture of the particle heat source and the sludge by a sludge drying device, separating the particle heat source and the sludge by a screening device, and respectively conveying the separated mixture to a corresponding storage bin to realize subsequent recycling.
Preferably, the hardness of the thermosetting slag is as follows: mohs hardness is 5-7.
Preferably, the mixing degree, i.e. the mixing degree, of the particle heat source and the sludge after stirring and mixing is evaluated by taking the up-and-down fluctuation range of the mass ratio of the particle heat source and the sludge as a reference, and the fluctuation range is-15%.
Preferably, the fluctuation range is-5%.
Preferably, the molten state iron and steel slag includes blast furnace slag, molten iron desulphurization slag, converter slag, electric furnace slag or casting residues.
As a large amount of solid waste of steel plants, hot steel slag mainly comprises blast furnace slag, molten iron desulfurization slag, converter slag, electric furnace slag, casting residues and the like of the steel plants, and the slag needs to be cooled from a molten state to a solid state. At present, competitive slag treatment methods in the market, namely a roller method, a heat stewing method and air quenching, all need to adopt special equipment, cool and solidify slag in a water cooling mode, and waste heat utilization efficiency is low and even cannot be utilized. Therefore, the solidified hot iron and steel slag is used as a particle heat source to be combined with the sludge, and a roller drying mode is adopted to form a set of sludge drying treatment method based on the particle heat source.
In the sludge drying treatment method of the invention:
the granular heat source of the invention adopts a slag treatment roller to treat slag (molten state steel slag) of a steel plant, and the hot state steel slag (solid state) is subjected to physicochemical treatment and screening according to the sludge drying process requirement.
As a particle heat source adopted by the sludge drying process, the hardness requirement of the hot iron and steel slag is determined according to the subsequent stirring, mixing and drying modes so as to control the crushing and pulverization degree of the hot iron and steel slag in the stirring, mixing and drying processes, thereby controlling the mutual pollution degree of the iron and steel slag and sludge.
And after the particle heat source is generated, feeding the particle heat source into a screening device through a high-temperature conveying device to obtain the particle heat source with the particle size range meeting the sludge drying requirement.
The granular heat source is stirred and mixed with the sludge after sieving so as to facilitate the subsequent sludge separation. The screening of the hot iron and steel slag meets the particle size requirement, namely the ratio of the median particle size (D50) of the hot iron and steel slag 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 dried sludge is 2-10.
And the sieved particle heat source is sent to a particle heat source inlet of the sludge drying device through the heat preservation conveying device and enters the sludge drying device. Meanwhile, the sludge to be dried is sent to a sludge inlet of the sludge drying device through the sludge conveying device and enters the sludge drying device. And (3) completing the stirring, mixing and drying processes of the particle heat source and the sludge 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 to be 1.0-10.0, and is specifically determined according to the factors such as the target water content of the sludge, the yield of the dried sludge, the yield of the hot steel slag and the like, and can be preferably 2.0-5.0.
The mixing degree, namely the mixing degree, of the particle heat source and the sludge after stirring and mixing is an important index for influencing the sludge drying efficiency, the up-and-down fluctuation range based on the mass ratio of the particles to the sludge is evaluated, the selectable fluctuation range is generally-15%, and the fluctuation range can be preferably-5% when the drying efficiency is strictly required. In order to ensure the mixing degree, the time required by stirring and mixing is 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 technology for drying sludge by utilizing tail gas heat sources of power plants and the like, the invention can efficiently utilize the tail gas and the residual heat of solid slag in slag roller treatment according to different requirements (target water content), adopts a close contact heat exchange mode similar to sugar stir-fried chestnut by directly mixing and contacting the granular heat sources with the sludge, is obviously superior to a gas-solid heat exchange mode of convection and heat radiation in the prior art, realizes rapid, stable and continuous direct drying of organic sludge and separation of slag and sludge, is beneficial to subsequent recycling utilization of granular slag and sludge powder, and improves the added value of dry sludge. In the aspect of process equipment implementation, the invention utilizes the roller technology for treating the thermal state steel slag, and has the advantages of 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 described below with reference to the drawings and examples.
The invention relates to a sludge drying treatment method based on a particle heat source, which comprises the following steps:
1) Particle heat source production
The granular heat source adopts a slag treatment roller to carry out granulation treatment on molten steel slag of a steel plant to obtain hot solid slag, wherein the hot solid slag has Mohs hardness of 3-8;
2) Particle heat source screening
After the particle heat source is generated, the particle heat source is sent into a screening device through a heat preservation conveying device, the particle size of the obtained thermosetting slag is 10-100, the ratio of the median particle size (D50) of the thermosetting slag to the median particle size of the dried sludge is 2-10;
3) Sludge drying
The sieved particle heat source is sent to a sludge drying device through a heat preservation conveying device; meanwhile, the sludge to be dried is sent to a sludge drying device through a sludge conveying device, and the mixing, stirring and drying processes of the particle 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) Separation of granular sludge
And discharging the dried mixture of the particle heat source and the sludge by a sludge drying device, separating the particle heat source and the sludge by a screening device, and respectively conveying the separated mixture to a corresponding storage bin to realize subsequent recycling.
Example 1
In the drying treatment process of converter dust (OG mud) in a certain steel mill, as shown in fig. 1, the particle heat source is hot solid slag meeting the requirements obtained by a roller slag treatment process, and the flow rate ratio of the slag and the mud is controlled at 2.0. The single roller device processes 18 ten thousand tons of high-temperature steel slag each year, hot solid slag is obtained after the slag is processed by a slag processing roller, the temperature is controlled at 800 ℃, the median particle diameter (D50) is 5mm, the minimum particle diameter is 2mm, the Mohs hardness is 8, and the hot solid slag is sent into a solid drying roller through a heat preservation conveying device. During the steel slag treatment process, OG mud with water content of 85% is pumped into a solid drying roller by a sludge pump and is stirred and mixed with the thermosetting slag after being scattered. The hot solid slag and OG mud are fully mixed under the action of the roller propeller blades, and the sludge drying is completed. The stirring and mixing time of the inlet section of the drying roller is controlled to be 10min, and the drying time of the sludge in the drying section is controlled to be 10min. The dried sludge is sent into a vibrating screen through a screw conveying device through a discharge hole to finish the sludge separation, and at the moment, the OG sludge water content is 6 percent and is sent into a raw material bin of a rotary hearth furnace through a gas conveying pipeline.
Example 2
In the OG sludge drying treatment process of a certain steel plant, as shown in fig. 1, the particle heat source is the hot solid slag meeting the requirements obtained by the roller slag treatment process, and the flow rate of the slag sludge is controlled to be 10.0. The single roller device processes 18 ten thousand tons of high-temperature steel slag each year, hot solid slag is obtained after the slag is processed by a slag processing roller, the temperature is controlled at 800 ℃, the median particle diameter (D50) is 8mm, the minimum particle diameter is 2mm, the Mohs hardness is 3, and the hot solid slag is sent into a solid drying roller through a heat preservation conveying device. During the steel slag treatment process, OG mud with water content of 85% is pumped into a solid drying roller by a sludge pump and is stirred and mixed with the thermosetting slag after being scattered. The hot solid slag and OG mud are fully mixed under the action of the roller propeller blades, and the sludge drying is completed. The stirring and mixing time of the inlet section of the drying roller is controlled to be 1min, and the drying time of the sludge in the drying section is controlled to be 35min. The dried sludge is sent into a vibrating screen through a screw conveying device through a discharge hole to finish the sludge separation, and at the moment, the OG sludge water content is 6 percent and is sent into a raw material bin of a rotary hearth furnace through a gas conveying pipeline.
Example 3
In the OG sludge drying treatment process of a certain steel plant, as shown in fig. 1, the particle heat source is the hot solid slag meeting the requirements obtained by the roller slag treatment process, and the flow rate of the slag sludge is controlled to be 3.0. The single roller device processes 18 ten thousand tons of high-temperature steel slag each year, hot solid slag is obtained after the slag is processed by a slag processing roller, the temperature is controlled at 800 ℃, the median particle diameter (D50) is 5mm, the minimum particle diameter is 2mm, the Mohs hardness is 5, and the hot solid slag is sent into a solid drying roller through a heat preservation conveying device. During the steel slag treatment process, OG mud with water content of 85% is pumped into a solid drying roller by a sludge pump and is stirred and mixed with the thermosetting slag after being scattered. The hot solid slag and OG mud are fully mixed under the action of the roller propeller blades, and the sludge drying is completed. The stirring and mixing time of the inlet section of the drying roller is controlled to be 3min, and the drying time of the sludge in the drying section is controlled to be 5min. The dried sludge is sent into a vibrating screen through a screw conveying device through a discharge hole to finish the sludge separation, and at the moment, the OG sludge water content is 6 percent and is sent into a raw material bin of a rotary hearth furnace through a gas conveying pipeline.
Example 4
As shown in figure 1, the particle heat source of the cold-rolled alkaline sludge drying treatment process of a certain steel plant is hot solid slag meeting the requirements obtained by the roller slag treatment process, and the flow rate of the slag is controlled to be 1.0. The single roller device processes 18 ten thousand tons of high-temperature steel slag each year, hot solid slag is obtained after the slag is processed by a slag processing roller, the temperature is controlled at 250 ℃, the median particle diameter (D50) is 8mm, the minimum particle diameter is 3mm, the Mohs hardness is 7, and the hot solid slag is sent into a solid drying roller through a heat preservation conveying device. During the steel slag treatment, cold rolled alkaline sludge with water content of 85% is pumped into a solid drying roller by a sludge pump and is stirred and mixed with the thermosetting slag after being scattered. The hot solid slag and OG mud are fully mixed under the action of the roller propeller blades, and the sludge drying is completed. The stirring and mixing time of the inlet section of the drying roller is controlled to be 10min, and the drying time of the sludge in the drying section is controlled to be 20min. The dried slag mud is sent into a vibrating screen through a screw conveying device through a discharge hole to finish slag mud separation, at the moment, the water content of OG mud can be controlled to be 15%, and separated slag and mud respectively enter corresponding bins to wait for a truck to be sent to a user for use.
Example 5
As shown in figure 1, the particle heat source of the cold-rolled alkaline sludge drying treatment process of a certain steel plant is hot solid slag meeting the requirements obtained by the roller slag treatment process, and the flow rate of the slag is controlled to be 10.0. The single roller device processes 18 ten thousand tons of high-temperature steel slag each year, hot solid slag is obtained after the slag is processed by a slag processing roller, the temperature is controlled at 200 ℃, the median particle diameter (D50) is 5mm, the minimum particle diameter is 1mm, the Mohs hardness is 3, and the hot solid slag is sent into a solid drying roller through a heat preservation conveying device. During the steel slag treatment, cold rolled alkaline sludge with water content of 90% is pumped into a solid drying roller by a sludge pump and is stirred and mixed with the thermosetting slag after being scattered. The hot solid slag and OG mud are fully mixed under the action of the roller propeller blades, and the sludge drying is completed. The stirring and mixing time of the inlet section of the drying roller is controlled to be 1min, and the drying time of the sludge in the drying section is controlled to be 40min. The dried slag mud is sent into a vibrating screen through a screw conveying device through a discharge hole to finish slag mud separation, at the moment, the OG mud water content can be controlled to be 10%, and the separated slag and mud respectively enter corresponding bins to wait for a truck to be sent to a user for use.
Example 6
As shown in figure 1, the particle heat source of the cold-rolled alkaline sludge drying treatment process of a certain steel plant is hot solid slag meeting the requirements obtained by the roller slag treatment process, and the flow rate of the slag is controlled to be 3.0. The single roller device processes 18 ten thousand tons of high-temperature steel slag each year, hot solid slag is obtained after the slag is processed by a slag processing roller, the temperature is controlled at 250 ℃, the median particle diameter (D50) is 5mm, the minimum particle diameter is 1mm, the Mohs hardness is 6, and the hot solid slag is sent into a solid drying roller through a heat preservation conveying device. During the steel slag treatment, cold rolled alkaline sludge with water content of 85% is pumped into a solid drying roller by a sludge pump and is stirred and mixed with the thermosetting slag after being scattered. The hot solid slag and OG mud are fully mixed under the action of the roller propeller blades, and the sludge drying is completed. The stirring and mixing time of the inlet section of the drying roller is controlled to be 3min, and the drying time of the sludge in the drying section is controlled to be 15min. The dried slag mud is sent into a vibrating screen through a screw conveying device through a discharge hole to finish slag mud separation, at the moment, the OG mud water content can be controlled to be 20%, and the separated slag and mud respectively enter corresponding bins to wait for a truck to be sent to a user for use.
In summary, the sludge drying process adopting the particle heat source utilizes the direct mixed 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, and is a sludge drying process fully utilizing waste heat and improving drying efficiency.

Claims (5)

1. The sludge drying treatment method based on the particle heat source is characterized by comprising the following steps of:
1) Particle heat source production
The granular heat source adopts a slag treatment roller to carry out granulation treatment on molten steel slag of a steel plant to obtain hot solid slag, wherein the hot solid slag has Mohs hardness of 3-8;
2) Particle heat source screening
After the particle heat source is generated, the particle heat source is sent into a screening device through a heat preservation conveying device to obtain hot solid slag, wherein the ratio of the median particle diameter (D50) to the median particle diameter of the dried sludge is 10-100, and the ratio of the minimum particle diameter of the hot solid slag to the maximum particle diameter of the dried sludge is 2-10;
3) Sludge drying
The sieved particle heat source is sent to a sludge drying device through a heat preservation conveying device; meanwhile, the sludge to be dried is sent to a sludge drying device through a sludge conveying device, and the mixing, stirring and drying processes of the particle 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) Separation of granular sludge
And discharging the dried mixture of the particle heat source and the sludge by a sludge drying device, separating the particle heat source and the sludge by a screening device, and respectively conveying the separated mixture to a corresponding storage bin to realize subsequent recycling.
2. The sludge drying treatment method based on a particle heat source as claimed in claim 1, wherein the hardness of the thermosetting slag is: mohs hardness is 5-7.
3. The method for drying sludge based on a particulate heat source according to claim 1, wherein the degree of mixing of the particulate heat source and the sludge after stirring and mixing, i.e., the degree of mixing, is evaluated in a fluctuation range of-15% to 15% based on the mass ratio of the particulate heat source to the sludge.
4. A method of drying sludge based on a particulate heat source as claimed in claim 3 wherein the fluctuation range is-5% to 5%.
5. The sludge drying treatment process based on a particulate heat source as claimed in claim 1, wherein the molten state iron and steel slag comprises blast furnace slag, molten iron desulfurization slag, converter slag, electric furnace slag or casting residues.
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