CN113082799A - Dehydration process for carrying out deep extrusion on solid-liquid mixture through pressure transformation and dehydration system thereof - Google Patents
Dehydration process for carrying out deep extrusion on solid-liquid mixture through pressure transformation and dehydration system thereof Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 106
- 230000018044 dehydration Effects 0.000 title claims abstract description 62
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 33
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- 238000003825 pressing Methods 0.000 claims abstract description 25
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- 238000001035 drying Methods 0.000 claims description 18
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- 238000007664 blowing Methods 0.000 claims description 10
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- 238000010926 purge Methods 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 8
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/003—Filters formed by clamping together several filtering elements or parts of such elements integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/003—Filters formed by clamping together several filtering elements or parts of such elements integrally combined with devices for controlling the filtration
- B01D25/007—Filters formed by clamping together several filtering elements or parts of such elements integrally combined with devices for controlling the filtration by pressure measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/003—Filters in combination with devices for the removal of liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/003—Filters in combination with devices for the removal of liquids
- B01D36/006—Purge means
Abstract
The invention relates to the technical field of solid-liquid separation, in particular to a dehydration process for carrying out deep extrusion on a solid-liquid mixture through pressure transformation and a dehydration system thereof. The dehydration process for carrying out deep extrusion on the solid-liquid mixture by pressure swing comprises the following steps: and (3) applying pressure change to the solid-liquid mixture to perform deep extrusion dehydration. By applying pressure change to the solid-liquid mixture, the solid-liquid mixture can be deeply extruded and dehydrated between quick 'loosening and tightening', so that the content of water in the filter cake is effectively reduced, the application of the filter cake is expanded, and pollution caused by filter cake transportation is reduced.
Description
Technical Field
The invention relates to the technical field of solid-liquid separation, in particular to a dehydration process for carrying out deep extrusion on a solid-liquid mixture through pressure transformation and a dehydration system thereof.
Background
In the prior art, a solid-liquid mixture is generally treated by pressurizing the mixture by a feed pump and then is sent into a plate-frame filter, water or air with certain pressure is introduced into gaps between hollow interlayers of filter plates or membranes embedded outside the filter plates after traditional filtration, so that water in the filter cakes is squeezed for the second time, and the water in the filter cakes is further reduced. However, even after dehydration by the above-mentioned methods, the water content in the filter cake is as high as 40% at the lowest, and can even be as high as 60%. The filter cake has high water content, and the problems of pollution, industrial wastewater and the like are easily caused in the transportation process of the filter cake. The filter cake can be generally used in a circulating fluidized bed boiler for blending combustion, coal blending or special preparation of the filter cake, a coal slime combustion boiler and the like, but if the water content of the filter cake is high, the filter cake can be used in the industrial process only by removing water for the second time, and the secondary dehydration increases the energy consumption and increases the difficulty. Therefore, how to quickly and simply reduce the water content in the filter cake is an important operation for expanding the application of the filter cake after filtration.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a dehydration process for carrying out deep extrusion on a solid-liquid mixture by changing pressure and a dehydration system thereof. The dehydration process of the embodiment of the invention applies variable pressure to the solid-liquid mixture for deep extrusion, can effectively reduce the water content of the filter cake after extrusion, further expands the application of the filter cake and also reduces the pollution caused by transporting the filter cake.
The invention is realized by the following steps:
in a first aspect, the present invention provides a dehydration process for deep extrusion of a solid-liquid mixture under pressure swing, comprising: and (3) applying pressure change to the solid-liquid mixture to perform deep extrusion dehydration.
In an alternative embodiment, the solid-liquid mixture is cycled through pressure-relief;
preferably, the pressure-relief comprises: removing the increased pressure after applying the pressure to the solid-liquid mixture to 0.6-2.0 MPa;
preferably, the cycle is pressurized-depressurized for a period of 5 to 20 minutes.
In an alternative embodiment, the method comprises the following steps: before the solid-liquid mixture is subjected to pressure change, hot dry air is introduced for back blowing, and preliminary dehydration is carried out on the solid-liquid mixture; specifically, after the central feeding pipe is back blown, the blowing gas passes through the relatively loose filter cake gap to blow the solid-liquid mixture, and part of water is taken out.
Preferably, the time for back flushing is 3-15s
Preferably, the time for preliminary dehydration is 2-20 min.
In an alternative embodiment, the method comprises the following steps: after applying pressure swing to the solid-liquid mixture, blowing the surface of the solid-liquid mixture by using hot dry air;
preferably, the time for purging is 2-10 min.
In an alternative embodiment, the temperature of the hot drying air is 70-130 ℃.
In an alternative embodiment, the method comprises the following steps: before deep dehydration, the solid-liquid mixture is introduced into a dehydration device, preferably, dry materials per hour are fed, and the feeding flow rate is 50-100m3The outlet pressure is set to 0.8-1.5 MPa.
In a second aspect, the present invention provides a dewatering system for implementing the dewatering process of deep-pressing solid-liquid mixture by pressure swing according to the foregoing embodiment, the dewatering system comprising: the device comprises a filter press for deep extrusion dehydration and a pressure changing device for applying pressure change, wherein the pressure changing device is connected with the filter press.
In an optional embodiment, the pressure changing device comprises a membrane-driven oil pump and a membrane-driven oil system, the membrane-driven oil system is connected with one end of the membrane-driven oil pump, and the other end of the membrane-driven oil pump is connected with the filter press.
In an alternative embodiment, the dewatering system further comprises: a dry air heater connected with the filter press.
In an alternative embodiment, the dewatering system further comprises a filtrate tank, and the liquid outlet of the filter press is connected with the filtrate tank.
The invention has the following beneficial effects: according to the embodiment of the invention, the solid-liquid mixture is subjected to pressure change, so that the solid-liquid mixture can be deeply extruded and dehydrated between quick 'loosening and tightening', the content of water in the filter cake is effectively reduced, the application of the filter cake is expanded, and pollution caused by filter cake transportation is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a dewatering system provided in embodiment 1 of the present invention.
In the figure: 100-a dewatering system; 110-a feed pump; 120-a filter press; 130-a hydraulic system; 140-dry air heater; 150-a voltage transformation device; 151-diaphragm driven oil pump; 152-a diaphragm drive oil system; 160-filtrate tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the prior art, the solid-liquid mixture with high water content (the water content is more than 80%) is dehydrated by directly passing the solid-liquid mixture through a plate and frame filter press at first, but the residual water is still high after the dehydration mode. Therefore, the process is improved, the dehydration efficiency is improved, and the improvement mode is as follows: (1) a plate frame type filter press, a cloth bag type filter and the like are combined; (2) applying constant pressure when the plate and frame filter press filters; (3) introducing cold air into the filter cake after filter pressing for purging; (4) and loosening the compacted filter cake, and introducing water vapor and the like. The above problems are encountered, (a) even if improved in the manner described above, the resulting filter cake has a moisture content of at least 40%; (b) high requirements on equipment, complex operation, high energy consumption, equipment maintenance and short equipment operation.
The treatment method of the dewatered filter cake comprises the following steps: (1) burying; (2) blending and burning, blending coal or specially preparing filter cakes, coal slime burning boilers and the like in the circulating fluidized bed boiler. However, if the water content of the dewatered filter cake is too high, various problems can be caused, such as: (1) the filling amount is increased during filling, and the filling is easy to collapse after filling; (2) the filter cake needs to be transported to a landfill site for landfill, and if the water content of the filter cake is too high, liquid in the filter cake easily seeps to a road surface during transportation, so that industrial wastewater is formed, and the environmental protection problem is caused; the water content is high, and the filter cake is not easy to be transported to a transport vehicle; (3) the filter cake has high water content, can not be directly used in a circulating fluidized bed boiler for blending combustion, coal blending or special preparation of filter cakes, coal slime combustion boilers and the like, needs secondary dehydration, and increases the production cost, energy consumption and operation. Therefore, it is required to further enhance the dehydration effect of the dehydration process.
Therefore, the embodiment of the invention provides a dehydration process for deeply extruding a solid-liquid mixture by variable pressure, which comprises the following steps:
introducing the solid-liquid mixture into dehydration equipment; the feeding amount is calculated by dry base materials per hour, and the feeding flow is 50-100m3The outlet pressure is set to 0.8-1.5 MPa. For example, 50m3/h、60m3/h、75m3/h、80m3/h、85m3/h、90m3/h、98m3H and 100m3H is equal to 50-100m3Any value between/h; 0.8 to 1.5MPa such as 0.8MPa, 0.9MPa, 1.0MPa, 1.1MPa, 1.15MPa, 1.2MPa, 1.35MPa, 1.4MPa, 1.45MPa and 1.5 MPa. The feeding amount is adopted to greatly shorten the feeding time, the processing capacity of the filter cake deep dehydrator is improved, the outlet pressure of the feeding pump is improved to a certain degree, the dehydration depth of the filter cake during traditional filtering is ensured, and meanwhile, the problem of abrasion of a feeding pipeline is also solved. The dehydration equipment can adopt a plate-and-frame filter or other filtering equipment, as long as the filtering equipment can realize filtering and is used together with equipment for realizing pressure transformation, so that the pressure transformation of a solid-liquid mixture is within the protection range of the embodiment of the invention.
And then hot drying air is introduced into the dehydration equipment, the central pipe is blown back, and the time for blowing back the hot drying air is 3-15s, such as any value between 3-15s, such as 3s, 4s, 5s, 8s, 10s, 13s, 15s and the like. The hot dry air blows out the solid-liquid mixture with high water content left in the feeding central pipe out of the dehydration system, and the dehydrated material is influenced when the material is unloaded.
And after the back blowing, continuously introducing hot drying air into the solid-liquid mixture in the dewatering equipment to perform primary dewatering, wherein the time for introducing the hot drying air at the moment is 2-20min, such as any value between 2 min and 20min, such as 2 min, 3 min, 5min, 7 min, 10min, 12 min, 13 min, 15 min, 17 min, 18 min, 19 min, 20min and the like.
This hot drying air is not only acted on solid-liquid mixture surface, more can act on inside the solid-liquid mixture, can be with its inside moisture desorption, promotes the dewatering effect.
And then, applying pressure change to the solid-liquid mixture to perform deep extrusion dehydration, and applying pressure change to the solid-liquid mixture to ensure that the solid-liquid mixture can fully extrude the moisture in the solid-liquid mixture between the 'tightness' and the 'tightness', thereby reducing the moisture of the filter cake without performing secondary dehydration.
Specifically, pressurizing-depressurizing the solid-liquid mixture cycle; for example, the increased pressure may be removed after applying a pressure to the solid-liquid mixture of 0.6 to 2.0MPa, for example, to any value between 0.6 and 2.0MPa, such as 0.6MPa, 0.7MPa, 0.85MPa, 0.9MPa, 0.95MPa, 1.0MPa, 1.3MPa, 1.5MPa, 1.8MPa, and 2.0 MPa. The pressure applying time is consistent with the pressure releasing time, the pressure adding/releasing time is generally 0.5s-8s, the water removing effect can be further improved by adopting the pressurization rate, and when the pressure reaches a set value, the pressure is immediately released, so that the pressure is recovered to the normal pressure.
The specific process is as follows: applying pressure to the solid-liquid mixture to 0.6-2.0MPa to compact the solid-liquid mixture under the pressure, discharging water, immediately discharging the applied pressure to loosen the compacted solid-liquid mixture, extruding and releasing the filter cake after traditional filtration at high frequency to further extrude and remove residual water in the filter cake, and frequently changing extrusion gaps and pressure in the filter cake like twisting a cleaning cloth to remove water to the maximum extent.
Further, the time for circularly pressurizing and depressurizing is 5-20 minutes. For example, 5 minutes, 7 minutes, 10 minutes, 12 minutes, 13 minutes, 15 minutes, 17 minutes, 18 minutes, 19 minutes, 20 minutes, or any other value between 5 and 20 minutes.
Or during the pressure changing period, hot dry air is intermittently introduced to timely take away the water extruded to the surface of the filter cake, so that the water removal effect is further improved.
Then, after the deep extrusion dehydration is finished, blowing the solid-liquid mixture subjected to the deep extrusion dehydration by utilizing hot dry air for 2-10 min; for example, 2 minutes, 3 minutes, 5 minutes, 7 minutes, 8 minutes, 10 minutes, and the like, and between 2 and 10 minutes, the solid-liquid mixture has been compacted to form a filter cake, and hot drying air is introduced to the solid-liquid mixture, and the hot drying air acts on the surface of the solid-liquid mixture to remove residual moisture on the surface of the solid-liquid mixture, thereby further reducing the moisture content.
Secondly, the embodiment of the invention adopts hot dry air instead of water vapor for the following reasons: (1) the energy consumption is reduced; (2) the water vapor is adopted to remove the water, and the purged water vapor needs to be filtered, so that the operation period of the equipment is further reduced, the maintenance times of the equipment are increased, and the production cost and difficulty are increased; (3) in order to avoid the formation of water by cooling and condensation or liquefaction of the water vapor and increase the moisture content in the filter cake, the water vapor needs to be insulated, and the production cost is further increased.
Further, the temperature of the hot drying air used in the examples of the present invention was 70 to 130 ℃. For example, the temperature is 70-130 deg.C, such as 70 deg.C, 75 deg.C, 80 deg.C, 86 deg.C, 92 deg.C, 95 deg.C, 100 deg.C, 105 deg.C, 110 deg.C, 115 deg.C, 120 deg.C, 125 deg.C, and 130 deg.C. The hot drying air with the temperature can be beneficial to removing water in gaps between loose solid-liquid mixtures and blowing and compacting the water on the surfaces of the solid-liquid mixtures by the hot drying air, and the water removal effect is improved.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a dewatering system 100, the dewatering system 100 includes a feed pump 110 and a filter press 120, the feed pump 110 is connected to the filter press 120, and then the solid-liquid mixture can be introduced into the filter press 120 for filter pressing.
This pressure filter 120 is plate and frame pressure filter, and this plate and frame pressure filter includes that the filter plate compresses tightly the filter plate cavity unit that system and a plurality of repeated a pair of filter plate are constituteed, and every repeating unit arranges on the frame to rather than being connected, every unit includes non-diaphragm side filter plate and diaphragm side filter plate, the relative non-diaphragm filter plate of diaphragm side filter plate inlays on the filter plate and has the diaphragm, and the filter plate behind the diaphragm sets up many spinal branchs post, the effect of support column, and one of them, during the solid-liquid mixture feeding, ensure filter cake cavity space relatively fixed (prevent the reverse deformation of diaphragm), and in addition, the space provides the place for the hydraulic oil that the diaphragm exerted pressure between the support column, and hydraulic oil advances the support post and exerts pressure to the diaphragm, makes the diaphragm take place deformation.
Both sides of the non-diaphragm side filter plate and the diaphragm side filter plate are provided with filter cloth dry hot air carrying partial water and filtrate which pass through the filter cloth and enter a filtrate system through a liquid discharge channel, and a solid-liquid mixture (filter cake) with low water content is left in a filter plate cavity to achieve the dehydration purpose.
That is, each repeating unit has the structure: filter cloth-non-diaphragm side filter plate-filter cloth-diaphragm press strip-diaphragm side filter plate-diaphragm press strip-filter cloth.
The filter plates on the diaphragm sides of two adjacent filter plate cavities are combined together, and the structure of the filter plate is filter cloth-diaphragm layering-diaphragm-filter plate base plate with a plurality of support columns on two sides-diaphragm layering-filter cloth.
The non-diaphragm side filter plate and the diaphragm side filter plate are provided with conventional structures such as a liquid discharge pipe, an exhaust hole, a positioning block and the like, namely the structures of the non-diaphragm side filter plate and the diaphragm side filter plate are the same as the structures of the filter plates in the conventional plate and frame type filter press.
The dewatering system 100 includes a hydraulic system 130, and the hydraulic system 130 is connected to the filter press 120, and then the plate frame pressing pressure can be controlled, so that the plate frame pressing pressure reaches 20-28 MPa.
The dewatering system 100 includes a drying air heater 140, the drying air heater 140 is connected to the filter press 120, and then the drying air is only the drying air heater 140, and the temperature is heated to 70-130 ℃ by gasified flash steam or other heat carriers, and then the preliminary water removal and purging are performed.
The dewatering system 100 includes a pressure swing apparatus 150 for applying a pressure swing, the pressure swing apparatus 150 being connected to the filter press 120. Specifically, the pressure changing device 150 includes a diaphragm-driven oil pump 151 and a diaphragm-driven oil system 152, wherein the diaphragm-driven oil system 152 is connected to one end of the diaphragm-driven oil pump 151, and the other end of the diaphragm-driven oil pump 151 is connected to the filter press 120.
The diaphragm drive oil system 152 includes: the oil-containing pipeline and the multiple groups of membrane oil distributors are respectively connected with the membrane driving oil pump 151, specifically, the multiple groups of membrane oil distributors are arranged at the outlet of the membrane driving oil pump 151, each distributor is connected with 2-20 membrane side filter plates, the treatment pressure of the membrane oil pump is set to be 0.6-2.0MPa, and the membrane oil pump operates to further extrude and separate residual moisture in a filter cake after traditional filtration under high-frequency extrusion and release, and like twisting a cleaning cloth, the extrusion gap and pressure in the filter cake are frequently changed, so that water is removed to the maximum extent.
The dewatering system 100 further comprises a filtrate tank 160, wherein a liquid outlet of the filter press 120 is connected to the filtrate tank 160, and the filtrate tank 160 is used for storing liquid in the extruded solid-liquid mixture.
Example 2
The present example provides a dehydration process for deep-pressing a solid-liquid mixture under pressure swing, the dehydration process was performed by the dehydration system provided in example 1, the water content of the solid-liquid mixture was 88%, and the solid-liquid mixture was black water with a high solid content at the bottom of a coal gasification clarifier. Specifically, the steps include:
introducing a solid-liquid mixture into the filter press through a feed pump, wherein the feeding conditions are as follows: the feed flow was 260m3The outlet pressure was set at 1.3 MPa.
And introducing hot dry air into the filter press to preliminarily dehydrate the solid-liquid mixture, wherein the temperature of the hot dry air is 90 ℃, and the introduction time is 10min (wherein the back flushing is 5s, and the rest time is used for sweeping and dehydrating).
And the hot dry air also acts on a pipeline between the feeding pump and the filter press, and then back flushing is carried out, so that the residual solid-liquid mixture in the pipeline is removed.
And then, starting a hydraulic system and adjusting the pressure to enable the compression pressure of the plate frame to be 20 MPa.
Then, a diaphragm driving oil system and a diaphragm driving oil pump are started, so that the solid-liquid mixture in the filter press is subjected to pressure transformation. Specifically, a pressure of 1.5M Pa was applied to the solid-liquid mixture, and then the pressure was released, thus repeating the pressure application-release for 10 minutes.
Subsequently, hot dry air was introduced into the filter press to purge the compacted solid-liquid mixture, the temperature of the hot dry air being 90 ℃ and the purging time being 5 min.
Namely, the dehydration of the solid-liquid mixture is completed, and the water content of the dehydrated solid-liquid mixture is detected to be 28%.
Example 3
The present example provides a dehydration process for deeply extruding a solid-liquid mixture under pressure swing, which was performed by the dehydration system provided in example 1, and the water content of the solid-liquid mixture was 90%, and the solid-liquid mixture was black water with a high solid content at the bottom of the coal gasification clarifier. Specifically, the steps include:
introducing a solid-liquid mixture into the filter press through a feed pump, wherein the feeding conditions are as follows: the feed flow is 200m3The outlet pressure was set at 1.3 MPa.
And introducing hot dry air into the filter press to preliminarily dehydrate the solid-liquid mixture, wherein the temperature of the hot dry air is 90 ℃, and the introduction time is 10min (wherein the back flushing is 5s, and the rest time is used for sweeping and dehydrating). And the hot dry air also acts on a pipeline between the feeding pump and the filter press, and then back flushing is carried out, so that the residual solid-liquid mixture in the pipeline is removed.
And then, starting a hydraulic system and adjusting the pressure to enable the compression pressure of the plate frame to be 20 MPa.
Then, a diaphragm driving oil system and a diaphragm driving oil pump are started, so that the solid-liquid mixture in the filter press is subjected to pressure transformation. Specifically, a pressure of 1.5M Pa was applied to the solid-liquid mixture, and then the pressure was released, thus repeating the pressure application-release for 10 minutes. During the pressure changing period, hot dry air is intermittently introduced, and after each repeated pressure application and pressure relief for 2 minutes, the hot dry air is introduced for 3 minutes.
Subsequently, hot dry air was introduced into the filter press to purge the compacted solid-liquid mixture, the temperature of the hot dry air being 90 ℃ and the purging time being 5 min.
Namely, the dehydration of the solid-liquid mixture is completed, and the water content of the dehydrated solid-liquid mixture is detected to be 25%.
Comparative example 1
This comparative example provides a dewatering process for deep pressing of a solid-liquid mixture under pressure swing, which differs from example 2 only in that: before the pressure change is applied to the solid-liquid mixture, the time for introducing hot drying air is shortened, and the introducing time is 1min (wherein the back flushing is carried out for 5s, and the rest time is used for purging and dehydrating).
Namely, the dehydration of the solid-liquid mixture is completed, and the water content of the dehydrated solid-liquid mixture is detected to be 31 percent.
Comparative example 2
This comparative example provides a dewatering process for deep pressing of a solid-liquid mixture under pressure swing, which differs from example 2 only in that: and (3) after the pressure of the solid-liquid mixture is changed, introducing hot drying air for a short time, wherein the introducing time is 1min (back flushing for 5s, and blowing for dehydration in the rest time).
Namely, the dehydration of the solid-liquid mixture is completed, and the water content of the dehydrated solid-liquid mixture is detected to be 29 percent.
Comparative example 3
This comparative example provides a dewatering process for deep pressing of a solid-liquid mixture under pressure swing, which differs from example 2 only in that: a pressure of 0.4MPa was applied to the solid-liquid mixture.
Namely, the dehydration of the solid-liquid mixture was completed, and the water content of the dehydrated solid-liquid mixture was checked to be 33%.
Comparative example 4
The comparative example provides a deep extrusion dehydration process for pressure swing of solid-liquid mixture, which is different from the embodiment 2 only in that: pressure application-release was repeated for 3 minutes.
Namely, the dehydration of the solid-liquid mixture is completed, and the water content of the dehydrated solid-liquid mixture is detected to be 32%.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dehydration process for carrying out deep extrusion on a solid-liquid mixture by variable pressure is characterized by comprising the following steps: and (3) applying pressure change to the solid-liquid mixture to perform deep extrusion dehydration.
2. The dehydration process for pressure swing deep extrusion of solid-liquid mixtures according to claim 1, wherein said solid-liquid mixture is cyclically pressurized-depressurized;
preferably, the pressure-relief comprises: removing the increased pressure after applying the pressure to the solid-liquid mixture to 0.6-2.0 MPa;
preferably, the cycle is pressurized-depressurized for a period of 5 to 20 minutes.
3. The dehydration process for deep pressing of solid-liquid mixtures with variable pressure according to claim 1, characterized by comprising: before the solid-liquid mixture is subjected to pressure change, hot dry air is introduced for back blowing, and preliminary dehydration is carried out on the solid-liquid mixture;
preferably, the back flushing time is 3-15 s;
preferably, the time to preliminary dehydration is 2-20 min.
4. The dehydration process for deep pressing of solid-liquid mixtures with variable pressure according to claim 1, characterized by comprising: after applying pressure swing to the solid-liquid mixture, blowing the surface of the solid-liquid mixture by using hot dry air;
preferably, the time for purging is 2-10 min.
5. A dewatering process for deep pressing of solid-liquid mixtures with variable pressure according to claim 3 or 4, characterized in that the temperature of the hot drying air is 70-130 ℃.
6. The dehydration process for deep pressing of solid-liquid mixtures with variable pressure according to claim 1, characterized by comprising: before deep dehydration, introducing the solid-liquid mixture into dehydration equipment;
preferably, the feeding flow rate is 50-100m per ton of dry material per hour3The outlet pressure is set to 0.8-1.5 MPa.
7. A dewatering system for performing the dewatering process for deep-pressing a solid-liquid mixture by variable pressure according to claim 1, wherein the dewatering system comprises: the device comprises a filter press for deep extrusion dehydration and a pressure changing device for applying pressure change, wherein the pressure changing device is connected with the filter press.
8. The dewatering system of claim 7, wherein the pressure swing apparatus comprises a membrane driven oil pump and a membrane driven oil system, the membrane driven oil system is connected to one end of the membrane driven oil pump, and the other end of the membrane driven oil pump is connected to the filter press.
9. The dewatering system of claim 7, further comprising: a dry air heater connected with the filter press.
10. A dewatering system according to any of claims 7-9, further comprising a filtrate tank, the outlet of the filter press being connected to the filtrate tank.
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| CN111288031A (en) * | 2020-02-21 | 2020-06-16 | 太原理工大学 | Alternating hydraulic pressure generating device and filter press |
| CN112044126A (en) * | 2020-09-24 | 2020-12-08 | 四川宝凯鑫诚环保科技有限公司 | Energy-saving squeezing and filtering method and filter press |
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| DE3713419A1 (en) * | 1987-04-22 | 1988-11-03 | Hansen Btr Gmbh | Process and apparatus for drying a filter cake in a filter press |
| CN203355409U (en) * | 2013-07-05 | 2013-12-25 | 山东煤机装备集团有限公司 | Rubber diaphragm squeezing and filtering plate group of fully-automatic horizontal filter press |
| CN105347651A (en) * | 2015-12-15 | 2016-02-24 | 南安市先创环保技术服务有限公司 | Sludge dewatering conditioning equipment |
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Application publication date: 20210709 |