Solid-liquid separation device

Abstract

The present invention relates to the technical field of wastewater disposal and recovery, and in particular to a solid-liquid separation device comprising: an outer cylinder, a filter membrane assembly arranged in the outer cylinder and surrounding a slurry chamber, the filter membrane assembly and the cylinder wall of the outer cylinder are separated from each other to form a water filtration channel; the solid-liquid separation device also comprises: a slurry inlet pipe inserted into the slurry chamber, a stirring device arranged in the slurry chamber to stir the slurry, the filter membrane assembly performs solid-liquid separation on the slurry, and the clarified water after the solid-liquid separation enters the water filtration channel; the solid-liquid separation device also comprises: a water filtration chamber, a return tower pipeline arranged at the bottom of the filter membrane assembly, and a water filtration guide pipe respectively connecting the outer cylinder and the water filtration chamber, the return tower pipeline is connected to the slurry chamber to discharge solid substances separated from the slurry. Compared with the prior art, the clarified water can be recovered through the water filtration chamber, and the solid substances can return to the tower by means of the return tower pipeline, and continue to participate in the reaction as a desulfurizer, thereby achieving effective reduction control of the wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater disposal and recovery, in particular to a solid-liquid separation device. Background Art

[0002] With the promulgation of the new environmental protection law, various standards and regulations have increasingly stringent requirements for wastewater discharge, and the requirements for the treatment of desulfurization wastewater have become increasingly stringent. The call for zero discharge of desulfurization wastewater is getting louder and louder. At present, zero discharge treatment of desulfurization wastewater from coal-fired power plants has become a general trend. At present, the main idea of ​​zero discharge of wastewater is to concentrate it first, and then directly inject it into the pipeline or conduct comprehensive treatment. If the amount of wastewater is too large, the concentration cost will be greatly increased. Therefore, how to reduce the amount of wastewater at the front end is an important step to reduce the zero discharge of wastewater, and it is also a problem that needs to be considered at present. Summary of the invention

[0003] The object of the present invention is to provide a solid-liquid separation device, which intends to achieve solid-liquid separation in the slurry by clarifying and filtering the slurry, and can directly recover the clarified water, and at the same time can directly discharge the separated solid matter back to the tower, thereby effectively controlling the discharge volume of wastewater at the front end of the system.

[0004] In order to solve the above problems, the embodiment of the present invention designs a solid-liquid separation device, comprising:

[0005] outer cylinder;

[0006] The filter membrane assembly is arranged in the outer cylinder and surrounds the axis direction of the outer cylinder to form a slurry chamber; the filter membrane assembly is also separated from the cylinder wall of the outer cylinder to form a water filtering channel;

[0007] A slurry inlet pipe is inserted into the slurry chamber to introduce the concentrated slurry into the slurry chamber;

[0008] A stirring device is arranged in the slurry chamber to stir the slurry entering the slurry chamber; the filter membrane assembly performs solid-liquid separation on the stirred slurry, so that the clarified water after the solid-liquid separation enters the water filtration channel;

[0009] A return tower pipeline is arranged at the bottom of the filter membrane assembly and communicated with the slurry chamber, and is used to discharge the solid matter separated from the slurry;

[0010] Water filter chamber;

[0011] The water filter guide pipe is respectively connected to the outer cylinder and the water filter chamber to guide the clarified water entering the water filter channel into the water filter chamber.

[0012] Compared with the prior art, the embodiments of the present invention are as follows: the solid-liquid separation device includes an outer cylinder, a filter membrane assembly disposed in the outer cylinder, and the filter membrane assembly surrounds a slurry chamber around the axis direction of the outer cylinder, and the filter membrane assembly is also separated from the cylinder wall of the outer cylinder to form a water filtration channel. In addition, the solid-liquid separation device also includes: a slurry inlet pipe inserted into the slurry chamber, a stirring device disposed in the slurry chamber, a tower return pipeline disposed at the bottom of the filter membrane assembly, a water filtration chamber, and a water filtration guide pipe connecting the water filtration chamber and the outer cylinder. Therefore, in the actual application process, the concentrated slurry can be introduced into the slurry chamber through the slurry inlet pipe, and the slurry can be stirred with the help of a stirring device, so that the filter membrane assembly can perform solid-liquid separation on the stirred slurry, so that the clarified water after solid-liquid separation can enter the filter water chamber through the filter water channel and the filter water guide pipe in turn to realize the recovery of clarified water. The recovered clarified water can be used as demister flushing water. At the same time, the separated solid matter can be returned to the tower with the help of the return tower pipeline, and can continue to participate in the reaction as a desulfurizer, thereby achieving effective reduction control of the wastewater at the front end of the system, significantly reducing the consumption of process water, so as to achieve water balance in the tower. At the same time, since the filter membrane assembly is arranged in the outer cylinder, and the stirring device is directly inserted into the slurry chamber surrounded by the filter membrane assembly, the entire solid-liquid separation device can realize the integration of slurry clarification and filtration while also having a small volume and a high degree of integration.

[0013] In addition, the filter membrane assembly includes: an inner cylinder, a filter membrane body arranged on the inner cylinder, and the filter membrane body is arranged around the cylinder wall of the inner cylinder; the filter membrane body and the cylinder wall of the inner cylinder are respectively separated from the cylinder wall of the outer cylinder to form a water filtration channel; the stirring device is inserted into the inner cylinder, and the slurry inlet pipe is connected to the inner cylinder.

[0014] In addition, the slurry inlet pipe is connected to the lower end of the inner cylinder.

[0015] In addition, the filter membrane body is a polymer membrane or a ceramic membrane.

[0016] In addition, the water filter chamber is made of stainless steel, glass fiber reinforced plastic or polymer material.

[0017] In addition, the filter membrane assembly also includes: a partition component arranged on the inner cylinder, the partition component divides the slurry chamber into a sludge area connected to the slurry inlet pipe and a clarification area opposite to the sludge area; the partition component is provided with water filtration holes connecting the sludge area and the clarification area.

[0018] In addition, the solid-liquid separation device further comprises: a sludge pumping mechanism connected to the tower return pipeline, a detection module arranged in the sludge area, and a main control module respectively connected to the sludge pumping mechanism and the detection module for communication;

[0019] The detection module is used to detect the density value of the slurry in the sludge area, and the main control module is used to open the sludge pumping mechanism when the detection module detects that the density value of the slurry in the sludge area is greater than a preset value, so that the sludge pumping mechanism discharges the sludge in the sludge area through the return tower pipeline;

[0020] The main control module is used to close the sludge pumping mechanism and cut off the return tower pipeline when the detection module detects that the density value of the slurry in the sludge area is less than a preset value.

[0021] In addition, the sludge pumping mechanism includes: a switch valve and a pump arranged on the return tower pipeline, and the switch valve and the pump are both communicatively connected to the main control module.

[0022] In addition, the separating component is a water filter plate or a hydrophobic membrane.

[0023] In addition, the bottom of the inner tube is a conical structure, and the return tower pipeline is connected to the bottom of the inner tube.

[0024] In addition, the water filter chamber is arranged at the bottom of the outer cylinder, and part of the return tower pipeline is placed in the water filter chamber, and another part is placed outside the water filter chamber.

[0025] In addition, the return tower pipeline includes: a first pipeline connected to the bottom of the inner tube along the axial direction of the inner tube, and a second pipeline connected to the first pipeline, and a portion of the second pipeline passes through the water filter chamber and is located outside the water filter chamber.

[0026] In addition, the solid-liquid separation device further comprises: a filtered water outlet pipe connected to the filter chamber.

[0027] In addition, the solid-liquid separation device further comprises: a pressure balance pipe, and the pressure balance pipe is connected to the top of the water filter chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a solid-liquid separation device according to a first embodiment of the present invention;

[0029] Figure 2 for Figure 1 A top view of

[0030] Figure 3 1 is a circuit module block diagram of the slurry discharge mechanism in the first embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0032] The first embodiment of the present invention relates to a solid-liquid separation device, such as Figure 1 and Figure 2 As shown, it comprises: an outer cylinder 1, a filter membrane assembly 2 disposed in the outer cylinder 1, and the filter membrane assembly 2 surrounds the axis direction of the outer cylinder 1 to form a slurry chamber 21. The filter membrane assembly 2 is also separated from the cylinder wall of the outer cylinder 1 to form a water filtering channel 22.

[0033] In addition, if Figure 1 As shown, the solid-liquid separation device of this embodiment further includes: a slurry inlet pipe 3, a stirring device 4 and a return tower pipeline 5. The slurry inlet pipe 3 is inserted into the slurry chamber 21 along the axial direction perpendicular to the outer cylinder 1, so as to introduce the concentrated slurry into the slurry chamber 21. The stirring device 4 is inserted into the slurry chamber 21 along the axial direction of the outer cylinder 1, so as to stir the slurry entering the slurry chamber 21, so as to enable the filter membrane assembly 2 to perform solid-liquid separation on the stirred slurry, so that the clarified water after solid-liquid separation can enter the filter water channel 22. In addition, the return tower pipeline 5 is arranged at the bottom of the filter membrane assembly 2, so as to discharge the solid matter separated from the slurry.

[0034] In addition, if Figure 1 As shown, the solid-liquid separation device of this embodiment further includes: a water filter chamber 6 and a water filter guide pipe 7. In addition, in this embodiment, as Figure 1 As shown, the water filter chamber 6 is arranged at the bottom of the outer cylinder 1 , and the water filter guide pipe 7 is connected to the outer cylinder 1 and the water filter chamber 6 respectively, so as to guide the clarified water entering the water filter channel 22 into the water filter chamber 6 .

[0035] It is not difficult to see from the above content that, since the clarified water can be recovered through the filter chamber 6, the recovered clarified water can be used as demister flushing water, and the solid matter separated from the slurry can be returned to the tower by means of the return tower pipeline 5, and can continue to participate in the reaction as a desulfurizer, thereby achieving effective reduction control of the wastewater at the front end of the system, significantly reducing the consumption of process water to achieve water balance in the tower, and at the same time, since the filter membrane assembly 2 is arranged in the outer cylinder 1, and the stirring device 4 is directly inserted into the slurry chamber 21 surrounded by the filter membrane assembly 2, the entire solid-liquid separation device can realize the integration of slurry clarification and filtration while also having a smaller volume and a higher degree of integration.

[0036] Specifically, in this embodiment, if Figure 1 and Figure 2 As shown, the filter membrane assembly 2 includes: an inner cylinder 23, and a filter membrane body 24 disposed on the inner cylinder 23. The filter membrane body 24 is arranged around the cylinder wall of the inner cylinder 23, and the filter membrane body 24 can be supported by the inner cylinder 23. In addition, in this embodiment, a card slot (not shown in the figure) is provided on the top of the inner cylinder 23 for clamping the filter membrane body 24. Of course, in the actual application process, the inner cylinder 23 can also adopt other methods to fix the filter membrane body 24, such as adhesive fixation. In this embodiment, the fixing method between the inner cylinder 23 and the filter membrane body 24 is not specifically limited. In addition, as Figure 1 As shown, the filter membrane body 24 and the cylinder wall of the inner cylinder 23 are separated from the cylinder wall of the outer cylinder 1 to form a water filter channel 22, the stirring device 4 is inserted into the inner cylinder 23, and the slurry inlet pipe 3 is connected to the inner cylinder 23, so that the slurry can be directly introduced into the inner cylinder 23 through the slurry inlet pipe 3, so that the stirring device 4 can stir the slurry in the inner cylinder 23, and when the stirring device 4 stirs the slurry, the solid-liquid separation of the slurry can be achieved through the filter membrane body 24 arranged on the inner cylinder 23, so that the clarified water after separation can enter the water filter chamber 6 through the water filter channel 22, so as to realize the collection of clarified water. However, as a preferred solution, as Figure 1 As shown, in order to enable the stirring device to fully stir the slurry, in this embodiment, the stirring device should be as close to the bottom of the inner cylinder 23 as possible, and the slurry inlet pipe 3 can be connected to the lower end of the inner cylinder 23, so that the stirring device 4 can stir the slurry as soon as possible after the slurry enters the inner cylinder 23, so as to promote the stirring effect of the slurry in the lower part of the inner cylinder 23.

[0037] And it is worth noting that Figure 1 As shown, the stirring device 4 used in this embodiment includes: an impeller 41 placed in the inner cylinder 23, a main shaft 42 fixed coaxially with the main shaft 42 of the impeller 41, and a driving component (not shown in the figure) for driving the main shaft 42 to rotate. The driving component can be a motor or other actuator, so the main shaft 42 can drive the impeller 41 to rotate under the drive of the driving component to achieve stirring of the slurry. The solid-liquid separation device of this embodiment also includes: a filtered water outlet pipe 8 connected to the filter chamber 6, through which the clarified water collected in the filter chamber 6 can be discharged for use as demister flushing water. In addition, it should be noted that, as Figure 1 As shown, the filter membrane body 24 used in this embodiment can be made of a polymer membrane or a ceramic membrane, and the water filter chamber 6 can be made of stainless steel, fiberglass or other polymer materials.

[0038] In addition, it is worth noting that in order to enable the filter membrane body 24 to play a better filtering role on the slurry, in this embodiment, the filter membrane assembly 2 also includes: a partition member 25 arranged on the inner cylinder 23, and the partition member 25 can separate the slurry chamber 21 into a sludge area (not shown in the figure) connected to the slurry inlet pipe 3 and a clearing area (not shown in the figure) opposite to the sludge area. And the partition member 25 is distributed with filter holes 251 connecting the sludge area 323 and the clearing area 322. Through each filter hole 251, large particles of solid matter in the slurry can be suppressed from mixing from the sludge area to the clearing area within a controllable range, so as to ensure that the liquid in the clearing area is relatively clear, thereby achieving layered filtration of the slurry in the slurry chamber 21, and further improving the effect of the filter membrane body 24 on solid-liquid separation of the slurry. It should be noted that the partition member 25 in this embodiment can be a filter plate or a hydrophobic material with dense pores, such as a hydrophobic membrane.

[0039] At the same time, in order to further enable the solid-liquid separation device to effectively discharge the solid matter separated from the slurry, the solid-liquid separation device of this embodiment also includes: a main control module (not shown in the figure), a sludge extraction mechanism connected to the return tower pipeline 5 (not shown in the figure), and a detection module (not shown in the figure) arranged in the sludge area. Figure 3 As shown, the main control module is respectively connected to the sludge pumping mechanism and the detection module for communication, so that the main control module can realize the opening and closing of the sludge pumping mechanism according to the signal sent by the detection module.

[0040] Specifically, in this embodiment, the detection module can use a densitometer, which is used to detect the density value of the slurry in the sludge area. And when the densitometer detects that the density value of the slurry in the sludge area is greater than the preset value, it means that there are more solid substances in the current slurry. At this time, the main control module can open the sludge pumping mechanism, so that the return tower pipeline 5 is connected, and the slurry in the sludge area can be directly discharged back to the tower through the return tower pipeline 5 with the help of the sludge pumping mechanism. When the density meter detects that the density value of the slurry in the sludge area is less than the preset value, it means that there are less solid substances in the current slurry. At this time, the main control module can close the sludge pumping mechanism, so that the return tower pipeline 5 is cut off. It is not difficult to see that by setting the main control module, the sludge pumping mechanism and the detection module, the solid-liquid separation device of this embodiment can realize the automatic discharge of solid substances in the slurry. At the same time, in order to realize the truncation and conduction of the return tower pipeline 5 by the sludge extraction mechanism and to extract the solid matter in the sludge area, the sludge extraction mechanism mentioned above includes: a switch valve (not shown in the figure) and a pump (not shown in the figure) arranged on the return tower pipeline 5, and Figure 3As shown, the switch valve and the pump are both connected to the main control module for communication, and the main control module is used to realize automatic control of the switch valve and the pump. However, it should be noted that the sludge pumping mechanism disclosed in this embodiment is only described by taking the switch valve and the pump as an example, and in the actual application process, the sludge pumping mechanism can also adopt other structural forms, which will not be described in detail in this embodiment.

[0041] In addition, in order to further improve the performance of discharging solid matter from the return tower pipeline 5, as Figure 1 As shown, the bottom of the inner cylinder 23 in this embodiment is a conical structure, and the return tower pipeline 5 is directly connected to the cylinder bottom 231 of the inner cylinder 23, so that the solid matter separated from the slurry can directly slide through the conical surface of the cylinder bottom 231 of the inner cylinder 23 to the center position of the cylinder bottom 231, so as to ensure that the return tower pipeline 5 can discharge the solid matter in a centralized manner, thereby improving the discharge performance of the solid matter. At the same time, in order to connect the corresponding return tower pipeline 5 to the cylinder bottom position of the inner cylinder 23, as shown in FIG. Figure 1 As shown, the return tower pipeline 5 includes: a first pipeline 51 and a second pipeline 52, wherein the first pipeline 51 is arranged in the water filter chamber 6 and connected to the bottom of the inner tube 23 along the axial direction of the inner tube 23, and the second pipeline 52 is partially arranged in the water filter chamber 6, and the other part passes through the water filter chamber 6 along the axial direction perpendicular to the inner tube 23 to realize the discharge of solid matter.

[0042] In addition, as a preferred solution, the solid-liquid separation device of this embodiment also includes: a pressure balance pipe 9, which is connected to the top of the water filter chamber 6. The pressure balance in the water filter chamber 6 can be achieved through the pressure balance pipe 9 to avoid negative pressure inside.

[0043] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A solid-liquid separation device, characterized in that: include: outer cylinder; The filter membrane assembly is arranged in the outer cylinder and surrounds the axis direction of the outer cylinder to form a slurry chamber; The filter membrane assembly is also separated from the wall of the outer cylinder to form a water filtering channel; A slurry inlet pipe is inserted into the slurry chamber to introduce the concentrated slurry into the slurry chamber; A stirring device is arranged in the slurry chamber to stir the slurry entering the slurry chamber; the filter membrane assembly performs solid-liquid separation on the stirred slurry, so that the clarified water after the solid-liquid separation enters the water filtration channel; A return tower pipeline is arranged at the bottom of the filter membrane assembly and is connected to the slurry chamber, and is used to discharge the solid matter separated from the slurry. The solid matter returns to the tower through the return tower pipeline and continues to participate in the reaction as a desulfurization agent; Water filter chamber; A water filter guide pipe is connected to the outer cylinder and the water filter chamber respectively, and guides the clarified water entering the water filter channel into the water filter chamber, and the clarified water in the water filter chamber is used as demister flushing water; Wherein, the filter membrane assembly comprises: an inner cylinder, a filter membrane body arranged on the inner cylinder, the filter membrane body is arranged around the cylinder wall of the inner cylinder; the filter membrane body and the cylinder wall of the inner cylinder are respectively separated from the cylinder wall of the outer cylinder to form a water filtration channel; the stirring device is inserted into the inner cylinder, and the slurry inlet pipe is connected to the inner cylinder; the filter membrane assembly also comprises: a partition component arranged on the inner cylinder, the partition component divides the slurry chamber into a sludge area connected to the slurry inlet pipe and a clearing area opposite to the sludge area; the partition component is provided with water filtration holes connecting the sludge area and the clearing area; the filter membrane body is a polymer membrane or a ceramic membrane, and the partition component is a water filter plate or a hydrophobic membrane.

2. The solid-liquid separation device according to claim 1, characterized in that: The slurry inlet pipe is connected to the lower end of the inner cylinder.

3. The solid-liquid separation device according to claim 1, characterized in that: The water filtering chamber is made of stainless steel, glass fiber reinforced plastic or polymer material.

4. The solid-liquid separation device according to claim 1, characterized in that: The solid-liquid separation device further comprises: a sludge pumping mechanism connected to the tower return pipeline, a detection module disposed in the sludge area, and a main control module respectively connected to the sludge pumping mechanism and the detection module for communication; The detection module is used to detect the density value of the slurry in the sludge area, and the main control module is used to open the sludge pumping mechanism when the detection module detects that the density value of the slurry in the sludge area is greater than a preset value, so that the sludge pumping mechanism discharges the sludge in the sludge area through the return tower pipeline; The main control module is used to close the sludge pumping mechanism and cut off the return tower pipeline when the detection module detects that the density value of the slurry in the sludge area is less than a preset value.

5. The solid-liquid separation device according to claim 4, characterized in that: The sludge pumping mechanism comprises: a switch valve and a pump arranged on the return tower pipeline, and the switch valve and the pump are both communicatively connected with the main control module.

6. The solid-liquid separation device according to claim 2, characterized in that: The bottom of the inner cylinder is a conical structure, and the return tower pipeline is connected to the bottom of the inner cylinder.

7. The solid-liquid separation device according to claim 6, characterized in that: The water filter chamber is arranged at the bottom of the outer cylinder, and a part of the return tower pipeline is placed in the water filter chamber, and another part is placed outside the water filter chamber.

8. The solid-liquid separation device according to claim 7, characterized in that: The return tower pipeline includes: a first pipeline connected to the bottom of the inner tube along the axial direction of the inner tube, and a second pipeline connected to the first pipeline, wherein a portion of the second pipeline passes through the water filter chamber and is located outside the water filter chamber.

9. The solid-liquid separation device according to claim 1, characterized in that: The solid-liquid separation device also includes: a filtered water outlet pipe connected to the water filtering chamber.

10. The solid-liquid separation device according to claim 1, characterized in that: The solid-liquid separation device further comprises: a pressure balance pipe, and the pressure balance pipe is connected to the top of the water filter chamber.

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