CN115634499A - A swirling flow shearing slag cleaning type solid-liquid separation device and its application method - Google Patents

Abstract

The invention discloses a swirling flow shearing slag removal type solid-liquid separation device and its use method, which belong to the technical field of solid-liquid separation equipment, including a tank body, a filter assembly, a diversion pipe, a partition, fluid conveying equipment, and power equipment. , the divider is located in the tank and divides the tank into two chambers, the filter assembly is located in one of the chambers, the guide tube passes through the divider and is connected with the divider in a rotating and sealed manner, and one end of the guide tube is connected to the The filter component is connected, and the other end is connected with the buffer chamber; the power equipment drives the guide tube to rotate, and the fluid delivery device provides backwash fluid for the buffer chamber. The inventive filter assembly rotates continuously, and the fluid will continuously impact and clean the outer wall of the filter element during the backwashing process. At the same time, the fluid distribution volume of each filter hole on the filter element will be changed, so that the instantaneous flow rate of some filter holes will increase, and the cleaning effect of the whole device will be better. it is good.

Description

A swirling flow shearing slag cleaning type solid-liquid separation device and its application method

technical field

The invention relates to the technical field of solid-liquid separation equipment, and also belongs to the technical field of filtering equipment, in particular to a swirling flow shearing slag removal type solid-liquid separation device and a method for using the same.

Background technique

At present, there are problems such as low product quality and large waste discharge in the domestic titanium dioxide industry prepared by chlorination. Titanium dioxide is an ultra-fine particle material with titanium dioxide as the main component, which is chemically processed into a particle size of 200nm to 350nm, and is coated with multiple or small components together with some other inorganic and organic substances. The acidic mother liquor used for acidolysis in the production process of titanium dioxide prepared by the chlorination method will be polluted by impurities such as particles produced in the preparation process, and will become acidic waste liquid after the acidolysis process is completed. The waste liquid contains high-concentration hydrochloric acid waste liquid and extremely fine particles such as titanium dioxide and colloid. If it is discharged directly without treatment, it will not only seriously pollute the environment, but also cause unnecessary waste of resources. In the production process of titanium dioxide by the chlorination method, after the crude titanium tetrachloride produced by the chlorination furnace undergoes three-stage condensation and liquefaction, the remaining tail gas contains a large amount of N ₂ , TiCl ₄ , HCl, CO, CO ₂ , etc. In the treatment process of alkali washing after water washing, most of TiCl ₄ , HCl, etc. are absorbed in the water washing process, so hydrochloric acid is produced as a by-product. At present, every 1t of titanium dioxide produced by titanium dioxide will produce about 0.4t of by-product hydrochloric acid with a concentration of 20% to 27%. In addition to absorbing HCl, water will also absorb SiCl ₄ , TiCl ₄ and a small amount of other metal chlorides in the tail gas during spray washing. It contains silicic acid, orthosilicic acid, TiO2, etc., which makes the by-product acid system contain white colloid, which is difficult for downstream customers to accept and difficult for market sales, which will affect the normal production of titanium dioxide in the long run. Therefore, solid-liquid separation is required.

At present, there are many solid-liquid separation equipment. In this industry, the impurity content is high, and the filter screen is easy to block. Therefore, backwash filters are usually used, which fix the filter screen in the container, and the solution passes through the filter screen to be purified. During operation Based on the pressure difference between the front and rear of the filter, when the pressure difference is high, reverse flushing is started to remove impurities, which realizes disassembly-free cleaning, but the cleaning effect is not good, and usually requires a long cleaning time, and the cleaning of impurities is not thorough, such as often occurs The impurity hangs on the outer wall of the filter screen after leaving the filter hole. After the liquid enters again, the suspended impurity quickly enters the filter hole again under the disturbance of the fluid, causing blockage.

Contents of the invention

In order to solve at least one of the above-mentioned problems, the present invention provides a cyclone shearing type solid-liquid separation device and its use method. The filter assembly rotates continuously so that the fluid continuously impacts the outer wall of the filter element, thereby cleaning the impurities on the outer wall of the filter element.

Concrete scheme of the present invention is as follows:

A cyclone shearing slag removal type solid-liquid separation device, comprising a tank body and a filter assembly located in the tank body, the filter assembly includes at least one filter element, characterized in that it also includes

A partition that is located in the tank body and divides the tank body into two chambers, the two chambers are respectively a filter chamber and a buffer chamber; the filter assembly is located in the filter chamber, and the filter chamber is provided with a first interface and for The first valve for opening and closing the first interface, the second interface and the second valve for opening and closing the second interface are provided on the buffer chamber, and the third interface and the second valve for opening and closing the third interface are provided at the bottom of the filter chamber. Three valves;

A diversion tube that passes through the partition and is rotationally and sealingly connected with the partition, one end of the diversion tube extends into the filter chamber and communicates with the filter assembly, and the other end communicates with the buffer chamber;

Power equipment used to drive the rotation of the draft tube;

Fluid delivery device for supplying fluid to the buffer cavity.

As a specific embodiment of the present invention, the filter element is a filter core, and the filter cores are radially distributed along the draft tube.

Further, the filter assembly includes at least two groups of filter elements, each group of filter elements is arranged along the circumference of the flow guide tube, and the filter elements in two adjacent groups of filter elements are arranged at intervals along the axial direction of the flow guide tube.

As a specific embodiment of the present invention, the filter element is a filter disc, and filter holes are provided on the upper side or the lower side of the filter disc.

Further, the included angle between the filter disc and the centerline of the draft tube is an acute angle.

Further, the filter disc is spiral.

A method for using the swirling flow shearing slag removal type solid-liquid separation device, the backwashing process includes the following steps: synchronously rotating the filter assembly during the backwashing process or synchronously rotating the filter assembly in the later stage of backwashing. Impurities on the surface of the filter assembly are removed by rotation.

Further, the rotation process includes forward rotation of the filter assembly and reverse rotation of the filter assembly, so that the outer wall of the filter assembly can be fully washed.

Still further, the filter assembly is rotated forward and reverse in a reciprocating manner.

Compared with the prior art, the present invention has the following advantages:

(1) The filter assembly of the present invention rotates continuously, and the fluid will continuously impact the outer wall of the filter element during the backwashing process, thereby clearing the impurities on the outer wall of the filter element and preventing them from adhering to the surrounding filter holes. The filter hole causes a rapid increase in the pressure differential of the filter assembly.

(2) When the filter assembly rotates, the fluid distribution of each filter hole on the filter element will be changed, so that the instantaneous flow rate of some filter holes increases (the more flow is distributed away from the filter hole of the draft tube), so that the flow rate of this part of the hole The cleaning is more thorough, and the cleaning effect of the whole device is better.

Description of drawings

Fig. 1 is the overall result schematic diagram of embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the filter assembly of Embodiment 1 of the present invention;

Fig. 3 is the schematic structural view of the filtration assembly of Embodiment 2 of the present invention;

Fig. 4 is a schematic structural view of a filter assembly in Embodiment 3 of the present invention;

Fig. 5 is a schematic structural view of a filter assembly according to Embodiment 4 of the present invention;

Fig. 6 is a schematic structural view of a filter assembly according to Embodiment 5 of the present invention;

In the figure, tank body 1, filter assembly 2, partition plate 3, draft tube 4, power equipment 5,

Filter chamber 11, buffer chamber 12, filter element 21, first through hole 41,

The first interface 111, the second interface 112, the third interface 113, the fourth interface 114,

The first valve 121 , the second valve 122 , the third valve 123 , and the fourth valve 124 .

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.

In the description of this embodiment, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features . Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features.

Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

In this embodiment, unless otherwise specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

Example 1

Please refer to FIG. 1 , which is a schematic diagram of the overall results of the present invention. The cyclone-shear slag-clearing solid-liquid separation device includes a tank body 1, a filter assembly 2, a partition plate 3, a draft pipe 4, and power equipment 5. The separator 3 is in the tank body 1 and divides the tank body 1 into upper and lower two independent chambers, which are respectively the filter chamber 11 and the buffer chamber 12; the filter assembly 2 is located in the filter chamber 11, and the guide pipe 4 is vertical set, and the lower end of the guide tube 4 passes through the partition 3 and is rotatably connected with the partition 3, and the upper end passes through the filter cavity 11 and is rotatably connected with the wall of the filter cavity 11. At the same time, the two ends of the guide tube 4 are closed, and it is located at A section of the filter cavity 11 communicates with the filter assembly 2, and a section of the guide tube 4 located in the buffer cavity 12 is provided with a first through hole 41 through the body. Therefore, the filter cavity 11 passes through the filter assembly 2, the guide tube 4 and the buffer cavity. 12 is connected, and the fluid in the two chambers can flow through. The side wall of the filter chamber 11 is provided with a first port 111 and a first valve 121 for opening and closing the first port 111, which is mainly used to control the raw material solution entering the filter chamber 11; the bottom of the filter chamber 11 is provided with a third port 113 And the third valve 123 for opening and closing the third interface 113, which is mainly used to discharge waste liquid containing high concentration impurities during backwashing; the buffer chamber 12 is provided with a second interface 112 and is used for opening and closing the second interface The second valve 122 of 112, this interface is mainly for the filtered clear liquid to flow out of the buffer chamber 12; the buffer chamber 12 is provided with a fourth interface 114 and a fourth valve 124 for opening and closing the fourth interface 114; the fourth The interface 114 is connected with a fluid delivery device (not shown in the figure), and is used to provide backwashing liquid for the buffer chamber 12, where the backwashing liquid level is filtered clear liquid (liquid without impurities). In addition, the upper end of the guide tube 4 protrudes out of the filter chamber 11 and is coaxially connected with the power device 5 . The power device is a variable speed motor, which is used to drive the guide tube 4 to rotate, and then drive the filter assembly 2 to rotate together.

Specifically, please refer to FIG. 2 , which is a schematic structural diagram of the filter assembly of this embodiment. In this embodiment, the filter assembly 2 includes four sets of filter elements 21 arranged along the circumference of the guide pipe 3, and each set of filter elements 21 has 16 cylindrical filter elements, and each filter element is arranged radially along the guide pipe.

The normal filtration process of this embodiment is as follows: the first valve 121 and the second valve 122 are opened, the third valve 123 and the fourth valve 124 are closed, the fluid enters the filter cavity 11 from the first interface 111, and then the filter element 21, the guide tube 3 into the buffer cavity 12, and finally flows out through the second interface 112.

The backwashing process of this embodiment is as follows: the first valve 121 and the second valve 122 are closed, the third valve 123 and the fourth valve 124 are opened, and the filtered clear liquid is filled into the buffer chamber 12 by using a fluid delivery device, and the fluid is moved along the The guide tube 3 and the filter element 21 enter the filter cavity 11 and finally flow out from the third interface 113 .

In this embodiment, during the backwashing process, the fluid passes through the filter element in reverse to wash out the impurities in the filter holes. Some impurities are directly discharged from the third interface along with the fluid, and some impurities adhere to the side of the filter holes. The power device 5 is started to reciprocate positively. Rotate the guide tube 3 in the opposite direction. During the rotation process, the drainage surface of the filter element is in contact with the fluid, and the impurities on the outer wall of the filter element are washed away by the fluid and the water fluid is discharged from the third interface. This prevents impurities after cleaning from adhering to the surrounding filter holes, and quickly enters the filter holes under the fluid disturbance during the later stage of filtration, resulting in a rapid increase in the pressure difference of the filter assembly; at the same time, the rotation of the filter element will change the pressure of each filter hole on the filter element. The amount of fluid distribution increases the instantaneous flow rate of some filter holes (the more the flow rate is distributed away from the filter hole of the guide tube), which makes the cleaning of this part of the hole more thorough. Both of the above two aspects can make the filter assembly clean more thoroughly, thus Extend its single use time and reduce the frequency of backwashing.

Example 2

The difference between Embodiment 2 and Embodiment 1 lies in the arrangement of the filter element 21 (filter core), please refer to FIG. 3 , which is a schematic structural diagram of the filter assembly of this embodiment. In the present embodiment, the filter assembly 2 also includes four groups of filter elements 21, and the four groups of filter elements are arranged along the circumference of the guide pipe 3, and each group of filter elements 21 has 16 cylindrical filter elements, and each filter element is arranged radially along the guide pipe. However, the filter elements in the adjacent two groups of filter elements are arranged at intervals along the axial direction of the draft tube, that is, they are staggered from each other, which is beneficial to the disturbance of the fluid when the filter elements rotate. In this way, the rotation time of the whole filter element can be further shortened, and the impurities on the outer wall of the filter element can be removed more quickly.

Example 3

The difference between embodiment 3 and embodiment 1 is that its filter assembly is different, please refer to Fig. 4, Fig. 4 is the structural representation of the filter assembly of this embodiment, filter element 21 is the disc-shaped filter disc in the present embodiment, the filter disc Both the upper side and the lower side are provided with filter holes.

Example 4

The difference between Embodiment 4 and Embodiment 3 is that the arrangement of the filter components is different. Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of the filter component of this embodiment. The angle between them is an acute angle, specifically 3°.

Example 5

The filter element in embodiment 5 is also a filter disc, but the filter disc is spiral, as shown in FIG. 6 .

test

(1) Influence of speed on cleaning effect

The device in Example 1 was used for testing. Firstly, the device was used to filter the by-product waste acid of titanium dioxide. The feed rate was 1m ³ /h. After a period of time, when the pressure difference between the inlet and outlet of the filter module reached 0.25MPa, it was backwashed. When backwashing, the filtered clear liquid is used as the backwashing medium, the flow rate is 3.6m ³ /h, the washing time is 2min, and the working cycle of the motor during the backwashing process is 1min (forward rotation 15s, pause 15s, reverse rotation 15s, pause 15s). After rinsing, use the filtered clear liquid as the medium for filtration, the filtration flow rate is (1m ³ /h), filter for 0min, and measure the pressure difference between the inlet and outlet of the filter module after 30min. Taking the motor speed as a variable, repeat the above steps to determine the influence of different speeds on the cleaning effect. The results are shown in Table 1.

Table 1 Statistical table of differential pressure of filter assembly after backwashing in Example 1 at different rotational speeds

It can be seen from Table 1 that during the secondary filtration, at the initial moment, the differential pressures of test cases 1-1 and 1-2 are the same, which are all greater than the differential pressures of test cases 1-3 and 1-4, which shows that test case 1- 1. In 1-2, there are still impurities in the filter holes after backwashing, while test cases 1-3 and 1-4 further remove the impurities in the filter holes after increasing the rotation speed, which is due to the uneven flow rate in the filter holes caused by the rotation Part of the filter holes have been cleaned more accurately, and some impurities that cannot be washed out under low impact flow have been removed. This shows that the cleaning effect of the filter assembly must be improved from the rotational speed.

Compared with the above-mentioned test examples for secondary filtration, the pressure difference at 0min and 30min increased significantly in test example 1-1, increased slightly in test examples 1-2 and 1-3, and did not increase in test example 1-4. Since the secondary filtration uses the filtered clear liquid as the filter medium, there is no solid particle that can be intercepted in the raw material, so no increase indicates that there is no solid impurity intercepted on the outer wall of the filter element. The obvious increase in Test Example 1 indicates that the filtration There are more filter impurities adsorbed on the outside of the element that can be intercepted, and these impurities will be sucked into the filter holes again in the later stage to shorten the filter cycle. This also shows that rotating the filter assembly is beneficial to improve the effect of backwashing.

(2) The influence of the arrangement of filter components on the cleaning effect

Get the device of embodiment 1, embodiment 2 to carry out experiment, the filter pore size and quantity of filter assembly in two devices are identical (filtering area is identical), earlier filter titanium dioxide by-product waste acid with device, feed rate 1m ³ / h, after a period of time, backwash the filter assembly when the pressure difference between the inlet and outlet reaches 0.25MPa. When backwashing, the filtered clear liquid is used as the backwashing medium, the flow rate is 3.6m ³ /h, and different washing times are selected. After rinsing, use the filtered clear liquid as the medium for filtration, the filtration flow rate is (1m ³ /h), filter for 0min, and measure the pressure difference between the inlet and outlet of the filter module after 30min. Taking the motor speed as a variable, repeat the above steps to determine the influence of different speeds on the cleaning effect. The results are shown in Table 2.

Table 2 Statistical table of pressure difference after different flushing times of filter components

It can be seen from Table 2 that when the backwashing time is 1min, the initial pressure difference of the secondary filtration of embodiment 1 and embodiment 2 is the same, indicating that the arrangement has no obvious influence on the removal of impurities in the filter holes; test example 2-1 and test Comparing example 2-3, comparing test example 2-2 with test example 2-4, it can be found that the pressure difference after secondary filtration for 30 minutes of test example 2-3 and 2-4 has no change with the initial pressure difference, which means that the The impurities in the filter element were completely cleaned, and the slight increase in test cases 2-1 and 2-2 showed that there were still impurities that could be intercepted on the outer wall of the filter element, which indicated that the arrangement in Example 2 was more conducive to the removal of fluid disturbance Impurities on the outer wall of the filter element.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of Changes or substitutions should fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. The utility model provides a sediment formula solid-liquid separation equipment is cut to whirl, includes jar body and the filter assembly who is located jar internal, and filter assembly includes at least one filter element, its characterized in that still includes

The partition plate is positioned in the tank body and divides the tank body into two chambers, and the two chambers are respectively a filter chamber and a buffer chamber; the filter assembly is positioned in the filter cavity, the filter cavity is provided with a first connector and a first valve for opening and closing the first connector, the buffer cavity is provided with a second connector and a second valve for opening and closing the second connector, and the bottom of the filter cavity is provided with a third connector and a third valve for opening and closing the third connector;

the honeycomb duct penetrates through the partition plate and is in rotary sealing connection with the partition plate, one end of the honeycomb duct extends into the filter cavity and is communicated with the filter assembly, and the other end of the honeycomb duct is communicated with the buffer cavity;

the power equipment is used for driving the flow guide pipe to rotate;

a fluid delivery device for providing fluid to the buffer chamber.

2. The rotational flow shear slag removal type solid-liquid separation device according to claim 1, wherein the filter element is a filter element, and the filter element is radially distributed along the flow guide pipe.

3. The cyclonic shear slag removal type solid-liquid separator as claimed in claim 2, wherein the filter assembly comprises at least two sets of filter elements, each set of filter elements being circumferentially disposed along the flow conduit, and the filter elements of two adjacent sets of filter elements being axially spaced along the flow conduit.

4. A cyclonic shear slag removal type solid-liquid separator as claimed in claim 1, wherein the filter elements are filter discs, and the filter discs are provided with filter holes on the upper or lower side thereof.

5. The rotational flow shearing slag removal type solid-liquid separation device according to claim 4, wherein an included angle between the filter disc and the center line of the flow guide pipe is an acute angle.

6. The rotational flow shearing slag removing type solid-liquid separation device according to claim 4, wherein the filter disc is spiral.

7. A method of using a cyclonic shear slag removal type solid-liquid separation device as claimed in any one of claims 1 to 6, comprising a backwash stage, the backwash stage comprising rotating the filter assembly during a flushing operation.

8. The method for using a cyclonic shear slag removal solid-liquid separation device according to claim 7, wherein the rotating filter assembly comprises a forward rotating filter assembly and a reverse rotating filter assembly.

9. The method of using a cyclonic shear slag removal solid-liquid separation device as defined in claim 8, wherein said rotating said filter assembly comprises circulating forward rotating filter assemblies, and counter rotating filter assemblies.

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