CN113686105B - Coal slime freeze drying dehydration and system - Google Patents

Coal slime freeze drying dehydration and system Download PDF

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Publication number
CN113686105B
CN113686105B CN202110986076.6A CN202110986076A CN113686105B CN 113686105 B CN113686105 B CN 113686105B CN 202110986076 A CN202110986076 A CN 202110986076A CN 113686105 B CN113686105 B CN 113686105B
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underflow
water
slime
slime water
coal
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CN113686105A (en
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徐宏祥
汪竞争
宁可佳
崔家画
邓久帅
尹亚男
田汉
李文涛
马金庆
于鹏
于超
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Beijing Mining Intelligent Selection Technology Co ltd
China University of Mining and Technology Beijing CUMTB
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Beijing Mining Intelligent Selection Technology Co ltd
China University of Mining and Technology Beijing CUMTB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/60—Washing granular, powdered or lumpy materials; Wet separating by non-mechanical classifiers, e.g. slime tanks 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The application relates to the technical field of coal slime water treatment, and provides a coal slime freeze drying dehydration method and a system, wherein the coal slime freeze drying dehydration method comprises the following steps: settling and concentrating the slime water to obtain overflow and underflow of the slime water; freezing the underflow of the slime water to freeze the underflow of the slime water; and dehydrating the underflow of the frozen slime water in a vacuum environment so as to sublimate the water in the underflow of the slime water. Through the technical scheme of this application, not only can realize getting rid of the free water in the coal slime, can also effectually get rid of the moisture in surface moisture and the capillary, realize the degree of depth dehydration of coal slime, and whole dehydration process safety ring protects.

Description

Coal slime freeze drying dehydration and system
Technical Field
The application relates to the technical field of coal slime water treatment, in particular to a coal slime freeze drying dehydration method and system.
Background
In the related technology, coal preparation plant coal slime water treatment mainly realizes solid-liquid separation through a flocculation-filter pressing process, the process needs to consume a large amount of chemicals, deep dehydration is difficult to realize for fine-particle coal slime, the porosity of a filter cake formed by the fine-particle coal slime is low, the structural gap of the filter cake is small, free water in the coal slime can be effectively removed through a filter pressing mode, but capillary water and particle surface water in micropores in the coal slime filter cake are difficult to remove, so that the water content of the filter cake formed by the fine-particle coal slime is high, working condition accidents often occur, and normal production operation is influenced.
Disclosure of Invention
An object of the embodiment of the first aspect of the present application is to provide a coal slime freeze drying dehydration method, which not only can remove free water in coal slime, but also can effectively remove surface moisture and moisture in capillary tubes, thereby realizing deep dehydration of coal slime.
The first embodiment of the application provides a dehydration method for coal slime freeze drying, which comprises the following steps: settling and concentrating the slime water to obtain overflow and underflow of the slime water; freezing the underflow of the slime water to freeze the underflow of the slime water; and dehydrating the underflow of the frozen slime water in a vacuum environment so as to sublimate the water in the underflow of the slime water.
In the implementation process, the sedimentation and concentration treatment of the slime water can be carried out in a concentration tank, and the slime water can be subjected to solid-liquid separation in the sedimentation process and is divided into overflow and concentrated underflow; the overflow of the slime water is circulated to the separation operation for recycling, and the underflow is frozen, so that the frozen slime water underflow can be obtained, then the frozen slime water underflow enters a vacuum environment, the water in the slime water underflow in the vacuum environment can be subjected to vacuum sublimation, and the dehydration effect can be realized.
In one possible implementation manner, after dewatering the underflow of the frozen slime water in a vacuum environment to sublimate water in the underflow of the slime water, the method further includes: and heating the frozen underflow of the slime water in a vacuum environment.
In the implementation process, as the moisture removed in the redrying stage of the coal slurry is adsorbed on the particle surface by van der waals force, under the premise of ensuring the product quality, the underflow of the coal slurry water needs to be properly heated in the stage so as to increase the temperature of the coal slurry, thereby facilitating the evaporation of the moisture.
In one possible implementation mode, the heating temperature for heating the underflow of the coal slime water after freezing is controlled within the range of 30-35 ℃.
In the implementation process, when the heating temperature is lower than 30 ℃, the temperature is too low to facilitate the evaporation of water, and when the heating temperature is higher than 35 ℃, the frozen coal slime may be decomposed due to too high temperature.
In one possible implementation manner, freezing the underflow of the slime water to freeze the underflow of the slime water includes: placing the underflow of the slime water in a first cooling device to be cooled to 1-3 ℃; and placing the underflow of the cooled slime water in a second cooling device and freezing to-30 to-50 ℃.
In the implementation process, the freezing process is carried out in two steps, firstly, the underflow of the slime water is placed in a first cooling device to be frozen to 1-3 ℃, and primary freezing is realized; then the underflow of the primarily frozen slime water is placed in a second cooling device for secondary freezing, and is frozen to-30 to-50 ℃ to completely freeze the underflow of the slime water so as to be convenient for dehydration of the underflow of the slime water.
In a possible implementation, the pressure in the second cooling device is less than 100 Pa; and the freezing time of the underflow of the cooled slime water in the second cooling device is within the range of 3-4 h.
In the implementation process, the pressure in the second cooling device is smaller than 100Pa, so that the evaporation of the moisture in the second freezing device can be realized in the freezing process, the moisture in the second freezing device is prevented from entering the underflow of the slime water, and meanwhile, the preliminary preparation can be made for vacuum sublimation, so that the underflow of the slime water is convenient for vacuum sublimation.
The cooling time of the underflow of the slime water in the second cooling device is controlled within the range of 3-4 h, so that the underflow of the slime water can be fully frozen, and the vacuum sublimation dehydration is further facilitated.
In one possible implementation manner, the dewatering the underflow of the frozen slime water in a vacuum environment to sublimate water in the underflow of the slime water includes: and reducing the pressure of the underflow of the coal slime water after freezing in the second cooling device to be within 20Pa so as to sublimate the water in the underflow of the coal slime water.
In the implementation process, the pressure of the second cooling device is reduced to be within 20Pa so as to be close to an absolute vacuum state, so that the moisture in the underflow of the slime water is rapidly vacuum sublimated in the second cooling device, and the dewatering efficiency of the slime is improved.
In one possible implementation, before the underflow of the coal slime water is frozen, the method further includes: and collecting the overflow of the coal slime water and circulating the overflow to the separation operation.
In the implementation process, because the slime water can generate overflow and underflow in the sedimentation and concentration processes, the overflow of the slime water is collected and circulated into the separation operation, so that the effects of energy conservation and environmental protection are realized.
In a possible implementation manner, after heating the frozen underflow of the slime water in a vacuum environment to sublimate the water in the underflow of the slime water for the second time, the method further includes: and collecting the water sublimated in the underflow of the slime water, and circulating to the separation operation.
In the implementation process, the same as the overflow effect of the collected slime water, the water sublimed in the underflow of the slime water (including the water sublimed for the first time and the water sublimed for the second time) is collected and circulated to enter the separation operation, so that the effects of energy conservation and environmental protection can be realized.
The second aspect of the present application provides in an embodiment a coal slime freeze drying and dewatering system, including: the concentration tank is used for settling and concentrating the slime water to obtain overflow and underflow of the slime water; the freezing device is connected with the concentration tank and is used for freezing the underflow of the slime water; and the vacuum pump is connected with the refrigerating device and used for pumping out air in the refrigerating device so as to enable the refrigerating device to be in a vacuum state and enable moisture in the underflow of the slime water to be sublimated.
In the implementation process, the freezing device is divided into a first freezing box and a second freezing box, the underflow of the slime water is firstly frozen to 1-3 ℃ in the first freezing box, and then is placed into the second freezing box for secondary freezing to-30-50 ℃ so as to completely freeze the underflow of the slime water, which is not only beneficial to improving the product quality, but also convenient for subsequent vacuum sublimation.
In one possible implementation manner, the method further includes: the heating device is connected with the refrigerating device and is used for heating the underflow of the coal slime water after being frozen in the refrigerating device; and the moisture collecting device is connected with the concentration tank and the refrigerating device, is used for collecting the overflow of the slime water and the sublimed moisture of the underflow of the slime water, and circulates to the separation operation.
In the dewatering method for coal slime water freeze drying provided by the embodiment of the first aspect of the application, the coal slime water can be settled and concentrated in the concentration tank, and the coal slime water can be subjected to solid-liquid separation in the settling process and is divided into overflow and underflow after concentration; the frozen coal slime underflow can be obtained by freezing the coal slime underflow, the frozen coal slime underflow is placed in a vacuum environment, water in the coal slime underflow in the vacuum environment can be sublimated in vacuum, and the dehydration effect can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic flow diagram of a dewatering process for freeze-drying coal slurry according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow diagram of a dewatering process for freeze-drying coal slurry according to another embodiment of the present disclosure;
fig. 3 is a schematic block diagram of a dewatering system for coal slurry freeze drying according to an embodiment of the present disclosure.
Icon: 200. a dewatering system for coal slime freeze drying; 201. a concentration tank; 202. a freezing device; 203. a vacuum pump; 204. a heating device; 205. and a moisture collection device.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
In a first aspect, an embodiment of the present application provides a dewatering method for coal slurry freeze-drying, please refer to fig. 1, in which the dewatering method for coal slurry freeze-drying includes:
step S100: and settling and concentrating the slime water to obtain the overflow and the underflow of the slime water.
Step S102: and freezing the underflow of the slime water to freeze the underflow of the slime water.
Step S104: and dehydrating the underflow of the frozen slime water in a vacuum environment so as to sublimate the water in the underflow of the slime water.
In the implementation process, the sedimentation and concentration treatment of the slime water can be carried out in a concentration tank, and the slime water can be subjected to solid-liquid separation in the sedimentation process and is divided into overflow and concentrated underflow; the overflow of the slime water is circulated to the separation operation for recycling, and the underflow is frozen, so that the frozen slime water underflow can be obtained, then the frozen slime water underflow enters a vacuum environment, the water in the slime water underflow in the vacuum environment can be subjected to vacuum sublimation, and the dehydration effect can be realized.
Referring to fig. 2, in a possible implementation manner, after dewatering the underflow of the frozen slime water in a vacuum environment to sublimate water in the underflow of the slime water, the method further includes:
step S106: and heating the frozen underflow of the slime water in a vacuum environment.
In the implementation process, as the moisture removed in the redrying stage of the coal slurry is adsorbed on the particle surface by van der waals force, under the premise of ensuring the product quality, the underflow of the coal slurry water needs to be properly heated in the stage so as to increase the temperature of the coal slurry, thereby facilitating the evaporation of the moisture.
In a possible implementation mode, the heating temperature for heating the underflow of the coal slime water after freezing is controlled within the range of 30-35 ℃.
In the implementation process, when the heating temperature is lower than 30 ℃, the temperature is too low to facilitate the evaporation of water, and when the heating temperature is higher than 35 ℃, the frozen coal slime may be decomposed due to too high temperature.
In one possible implementation manner, freezing the underflow of the slime water to freeze the underflow of the slime water includes: placing the underflow of the slime water in a first cooling device to be cooled to 1-3 ℃; and placing the underflow of the cooled slime water in a second cooling device and freezing to-30 to-50 ℃.
In the implementation process, the freezing process is carried out in two steps, firstly, the underflow of the slime water is placed in a first cooling device to be frozen to 1-3 ℃, and primary freezing is realized; then the underflow of the primarily frozen slime water is placed in a second cooling device for secondary freezing, and is frozen to-30 to-50 ℃ to completely freeze the underflow of the slime water so as to be convenient for dehydration of the underflow of the slime water.
In a possible implementation, the pressure in the second cooling device is less than 100 Pa; the freezing time of the underflow of the cooled slime water in the second cooling device is within the range of 3-4 h.
In the implementation process, the pressure in the second cooling device is smaller than 100Pa, so that the evaporation of the moisture in the second freezing device can be realized in the freezing process, the moisture in the second freezing device is prevented from entering the underflow of the slime water, and meanwhile, the preliminary preparation can be made for vacuum sublimation, so that the underflow of the slime water is convenient for vacuum sublimation.
The cooling time of the underflow of the slime water in the second cooling device is controlled within the range of 3-4 h, so that the underflow of the slime water can be fully frozen, and the vacuum sublimation dehydration is further facilitated.
In one possible implementation manner, the dewatering the underflow of the frozen slime water in a vacuum environment to sublimate water in the underflow of the slime water includes: and reducing the pressure of the underflow of the coal slime water after freezing in the second cooling device to be within 20Pa so as to sublimate the water in the underflow of the coal slime water.
In the implementation process, the pressure of the second cooling device is reduced to be within 20Pa so as to be close to an absolute vacuum state, so that the moisture in the underflow of the slime water is rapidly vacuum sublimated in the second cooling device, and the dewatering efficiency of the slime is improved.
In one possible implementation, before the underflow of the coal slime water is frozen, the method further includes: and collecting the overflow of the coal slime water and circulating the overflow to the separation operation.
In the implementation process, because the slime water can generate overflow and underflow in the sedimentation and concentration processes, the overflow of the slime water is collected and circulated into the separation operation, so that the effects of energy conservation and environmental protection are realized.
In a possible implementation manner, after heating the frozen underflow of the slime water in a vacuum environment to sublimate the water in the underflow of the slime water for the second time, the method further includes: and collecting the water sublimated in the underflow of the slime water, and circulating the water to the separation operation.
In the implementation process, the same as the overflow effect of the collected slime water, the water sublimed in the underflow of the slime water (including the water sublimed for the first time and the water sublimed for the second time) is collected and circulated to enter the separation operation, so that the effects of energy conservation and environmental protection can be realized.
In a second aspect, please refer to fig. 3, an embodiment of the present application provides a coal slurry freeze-drying dewatering system, including: the concentration tank is used for settling and concentrating the slime water to obtain overflow and underflow of the slime water; the freezing device is connected with the concentration tank and is used for freezing the underflow of the slime water; and the vacuum pump is connected with the refrigerating device and used for pumping out air in the refrigerating device so as to enable the refrigerating device to be in a vacuum state and enable moisture in the underflow of the slime water to be sublimated.
In the implementation process, the freezing device is divided into a first freezing box and a second freezing box, the underflow of the slime water is firstly frozen to 1-3 ℃ in the first freezing box, and then is placed into the second freezing box for secondary freezing to-30-50 ℃ so as to completely freeze the underflow of the slime water, which is not only beneficial to improving the product quality, but also convenient for subsequent vacuum sublimation.
In one possible implementation manner, the method further includes: the heating device is connected with the refrigerating device and is used for heating the underflow of the coal slime water after being frozen in the refrigerating device; and the moisture collecting device is connected with the concentration tank and the refrigerating device and used for collecting the overflow of the slime water and the sublimed moisture of the underflow of the slime water and circulating the moisture to the separation operation.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (7)

1. A dehydration method for coal slime freeze drying is characterized by comprising the following steps:
settling and concentrating the slime water to obtain overflow and underflow of the slime water;
freezing the underflow of the slime water to freeze the underflow of the slime water;
dehydrating the underflow of the frozen slime water in a vacuum environment to sublimate water in the underflow of the slime water;
and heating the frozen underflow of the slime water in a vacuum environment, wherein the heating temperature of the heated and frozen underflow of the slime water is controlled within the range of 30-35 ℃.
2. The method of claim 1, wherein freezing the underflow of coal slurry water to freeze the underflow of coal slurry water comprises:
placing the underflow of the slime water in a first cooling device to be cooled to 1-3 ℃;
and placing the underflow of the cooled slime water in a second cooling device and freezing to-30 to-50 ℃.
3. The method of claim 2,
the pressure in the second cooling device is less than 100 Pa;
and the freezing time of the underflow of the cooled slime water in the second cooling device is within the range of 3-4 h.
4. The method of claim 2, wherein dewatering the frozen underflow of coal slurry water in a vacuum environment to sublimate water in the underflow of coal slurry water comprises:
and reducing the pressure of the underflow of the coal slime water after freezing in the second cooling device to be within 20Pa so as to sublimate the water in the underflow of the coal slime water.
5. The method according to any one of claims 1-4, further comprising, prior to freezing the underflow of coal slurry water:
and collecting the overflow of the coal slime water and circulating the overflow to the separation operation.
6. The method according to any one of claims 1-4, characterized in that after heating the frozen underflow of slime water in a vacuum environment to secondarily sublimate water in the underflow of slime water, the method further comprises:
and collecting the water sublimated in the underflow of the slime water, and circulating the water to the separation operation.
7. The utility model provides a coal slime freeze drying dewatering system which characterized in that includes:
the concentration tank is used for settling and concentrating the slime water to obtain overflow and underflow of the slime water;
the freezing device is connected with the concentration tank and is used for freezing the underflow of the slime water;
the vacuum pump is connected with the refrigerating device and used for pumping air in the refrigerating device so as to enable the refrigerating device to be in a vacuum state and sublime water in the underflow of the slime water;
the heating device is connected with the refrigerating device and is used for heating the underflow of the coal slime water after being frozen in the refrigerating device;
and the moisture collecting device is connected with the concentration tank and the refrigerating device, is used for collecting the overflow of the coal slime water and the sublimed moisture of the underflow of the coal slime water, and circulates to the separation operation.
CN202110986076.6A 2021-08-26 2021-08-26 Coal slime freeze drying dehydration and system Active CN113686105B (en)

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CN103743201A (en) * 2013-12-30 2014-04-23 焦作市途志洗煤设备有限公司 Coal slime dryer and drying method
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CN113075019A (en) * 2021-04-29 2021-07-06 力鸿检验集团有限公司 Drying device and coal system appearance robot

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