CN214389024U

CN214389024U - Multistage filter and lyocell fiber solvent recovery system

Info

Publication number: CN214389024U
Application number: CN202120149706.XU
Authority: CN
Inventors: 孟磊
Original assignee: Asia Symbol Shandong Pulp And Paper Co ltd
Current assignee: Asia Symbol Shandong Pulp And Paper Co ltd
Priority date: 2021-01-20
Filing date: 2021-01-20
Publication date: 2021-10-15
Anticipated expiration: 2031-01-20

Abstract

According to the multi-stage filter provided by the scheme, when the multi-stage filter operates normally, a solvent enters from the liquid inlet of the shell, impurities are intercepted when the solvent passes through the multi-stage filter layers, and the purified solvent flows out from the liquid outlet. When multi-stage filter effect variation, need carry out the backwash to multi-stage filter, then lead to water to the liquid outlet, wash impurity from multi-stage filter layer and wash away, the pumice on pumice layer also can be along with impurity and rivers arrange filter equipment in through simultaneously, because the filtration aperture that filters the screen frame is less than the pumice size and is greater than the impurity size, impurity and rivers are discharged from sewage pipes through filtering the screen frame, and the pumice is then filtered the screen frame interception and is stayed in the casing. The arrangement can prevent the filter layer particles of the multi-stage filter from losing in the backwashing process and influencing the filtering effect. The scheme also provides a lyocell fiber solvent recovery system with the multistage filter, and the lyocell fiber solvent recovery system has the same beneficial effects.

Description

Multistage filter and lyocell fiber solvent recovery system

Technical Field

The utility model belongs to the technical field of water treatment, in particular to multi-stage filter and lyocell fiber solvent recovery system.

Background

The multi-stage filter is one of important equipment in a lyocell fiber solvent recovery and purification workshop, and is mainly used for filtering impurities such as fine fibers and particles in a solvent, specifically, the solvent is filtered layer by layer through a multi-stage filter layer arranged in a cavity of the multi-stage filter through a liquid inlet of the multi-stage filter, and the purified solvent is finally discharged from a liquid outlet.

Along with excessive impurities deposited in the multistage filter layers, when the filtering effect of the multistage filter is poor, backwashing is needed, namely, water is introduced into a liquid outlet of the multistage filter, and the impurities are discharged from a sewage outlet of the multistage filter along with water flow through the multistage filter layers. Because the density of the pumice stone layer of the multi-stage filter layer is lower, a large amount of pumice stones run out along with water flow, the pumice stones in the pumice stone layer are less and less, and the filtering effect is seriously influenced.

Therefore, the problem to be solved by those skilled in the art is how to prevent the filter effect from being affected by the loss of particles in the filter layer during the backwashing process of the multi-stage filter.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multi-stage filter and lyocell fibre solvent recovery system prevents that multi-stage filter from losing at backwash in-process filtering layer granule.

In order to solve the technical problem, the utility model provides a multistage filter, include the casing and install multistage filter layer in the casing, be provided with inlet, liquid outlet and drain on the casing, the top layer of multistage filter layer is the pumice layer, its characterized in that still includes back flush filter equipment, back flush filter equipment is including filtering screen frame and sewage pipes, filter the screen frame and pass through sewage pipes with the drain intercommunication, the filtration aperture of filtering the screen frame is less than the pumice size on pumice layer just is greater than the impurity size.

Optionally, the filtering screen body comprises a plurality of filtering screen pipes, and each filtering screen pipe is respectively communicated with the sewage discharge pipeline.

Optionally, the filtering sieve tube is a straight tube or an arc tube.

Optionally, the number of the filter screen pipes is 3-6.

Optionally, the multistage filter layer further comprises a fine sand layer, and the fine sand layer is laid below the pumice stone layer.

Optionally, the multi-stage filtration layer further comprises a gravel layer, and the gravel layer is laid below the fine sand layer.

Optionally, a compressed gas inlet communicated with the interface of the liquid outlet of the multistage filter is installed on the interface of the liquid outlet of the multistage filter.

Optionally, the filtering screen body is communicated with the sewage discharge pipeline through a joint.

Optionally, the backwash filter device is mounted in the housing.

The utility model also provides a lyocell fibre solvent recovery system, include as above multistage filter.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the multistage filter provided by the present invention.

In the upper diagram:

a liquid inlet 1; a sewage draining outlet 2; a liquid outlet 3; a filtering screen body 4; a joint 5; a sewage drain pipe 6; a pumice layer 7; a fine sand layer 8; a gravel layer 9; a compressed gas inlet 10.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality is more than two, and if there is a description that the first and the second are only used for distinguishing technical features, it is not understood that the relative importance is indicated or implied or the number of the indicated technical features is implicitly indicated or the precedence of the indicated technical features is implicitly indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

The core of the utility model is to provide a multi-stage filter and lyocell fiber solvent recovery system, prevent that multi-stage filter from losing in the filter layer granule of backwash in-process, influencing the filter effect.

In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the embodiment of the present invention provides a multistage filter for filtering impurities in LYOCELL (LYOCELL fiber) solvent, which specifically includes a housing, a multistage filtering layer, and a backwashing filter device.

Wherein, the shell is provided with a liquid inlet 1, a liquid outlet 3 and a sewage draining exit 2. Typically, the inlet port 1 and the outlet port 3 are located at the top and bottom of the housing, respectively. The liquid inlet 1 is used for introducing a solvent. The liquid outlet 3 is used for discharging the purified solvent during filtering and also used for introducing flushing liquid during back flushing. The drain outlet 2 is generally arranged on one side close to the liquid inlet 1 and between the liquid inlet 1 and the multi-stage filter layers and used for discharging flushing liquid and impurities during back flushing.

The top layer of the multi-stage filter layer is a pumice stone layer 7, the specific gravity of the pumice stone is small, and the pumice stone can float after being washed by water. When the water flow of the back flush passes through the pumice layer, the pumice can be flushed away. Of course, any filter particles which are easy to float away with the flushing liquid in the back flushing process can be regarded as pumice or pumice-like substances, and the pumice or any pumice-like substances are within the protection scope of the scheme.

Particularly, the scheme is characterized in that the backwashing filter device comprises a filter screen body 4 and a sewage discharge pipeline 6, and the filter screen body 4 is communicated with the sewage discharge port 2 through the sewage discharge pipeline 6. The filtering aperture of the filtering screen body 4 is smaller than the pumice size of the pumice layer 7 in order to intercept the pumice, and the filtering aperture of the filtering screen body 4 is also larger than the impurity size in order to discharge the impurities. When can understand, filter screen frame 4 can be regarded as a filter screen, and the size of its mesh is the filtration aperture, and the size of mesh needs to satisfy and can block the pumice and can pass through impurity again. The filtering screen body 4 can be made of stainless steel, iron or nylon, the precision and the material of the filtering screen body are adaptively selected according to actual needs, and the filtering screen body 4 capable of achieving the required functions is within the protection range of the scheme.

Based on the structure, the solvent enters from the liquid inlet 1 of the shell when the multi-stage filter operates normally, impurities are intercepted when the solvent passes through the multi-stage filter layer, and the purified solvent flows out from the liquid outlet 3. When the multi-stage filter effect variation, need carry out the backwash to multi-stage filter, then to 3 water of liquid outlet, wash impurity from multi-stage filter layer and get off, the pumice on pumice layer also can be along with impurity and rivers through well discharge filter equipment simultaneously, because the filtration aperture that filters screen frame 4 is less than the pumice size and is greater than the impurity size, impurity and rivers are discharged from sewage pipes 6 through filtering screen frame 4, and the pumice is then filtered screen frame 4 interception and is stayed in the casing. The arrangement can prevent the filter layer particles of the multi-stage filter from losing in the backwashing process and influencing the filtering effect.

In a preferred embodiment, the filtering screen 4 may comprise one or more filtering screens, preferably in a number of 3-6. Each filtering sieve pipe is respectively communicated with a sewage discharge pipeline 6. The filter sieve tube is provided with a connector only at one end, the connector is communicated with the sewage discharge pipeline 6, and the tube wall is composed of a filter screen. The other end of the filtering screen body 4 can be arranged on the inner cavity wall of the shell through a connecting bracket.

Wherein, the pipe can be straight tube or arc pipe, and the crooked shape of arc pipe can be according to the radian laminating design of casing inner chamber wall. Of course, the filter screen body 4 can be set into other shapes according to actual needs, and the filter screen body 4 capable of achieving the required functions is within the protection scope of the scheme.

The back washing filter unit can be arranged in the inner cavity of the shell and can also be arranged outside the shell. For example, the filtering screen body 4 is a plane filtering screen which is covered on the sewage outlet and can just intercept filtering particles such as pumice, and one end of the sewage pipeline 6 is communicated with the sewage outlet and the other end thereof extends out of the shell.

In this embodiment, the filtering screen 4 is communicated with the sewage draining pipeline 6 through a joint 5, and the joint 5 provides a connecting position for the filtering screen 4 and the sewage draining pipeline 6. When the number of the filtering screen bodies 4 is one, the joint 5 has two ports respectively connected with the filtering screen bodies 4 and the sewage draining pipeline 6. When the number of the filtering screen bodies 4 is multiple, the joint 5 is provided with a plurality of screen body interfaces for one-to-one corresponding connection with the filtering screen bodies 4 and a sewage pipe interface for connecting the sewage pipe 6. Specifically, a plurality of filter screens 4 are uniformly wrapped around the joint 5 and are communicated with the sewage drain 6 through the joint 5. The filtering screen body 4 and the sewage discharge pipeline 6 are both connected with the joint 5 through flanges, so that the filtering screen body is convenient to mount, dismount, clean and maintain.

In addition, a valve can be arranged on the sewage discharge pipeline 6 to control the opening and closing of the sewage discharge pipeline 6.

In this embodiment, the multi-stage filter layer includes a pumice layer 7, a fine sand layer 8, and a gravel layer 9, which are arranged in this order from top to bottom. It should be noted that the fine sand layer 8 and the gravel layer 9 do not run with the water during backwashing because they have a relatively high specific gravity, and the pumice stones of the pumice layer 7 run with the water because they have a relatively low specific gravity. In addition, the pressure of the backwashing water is controlled to ensure that the fine sand layer 8 and the gravel layer 9 cannot run out, but the pumice stone is different and floats after being washed by the water. Impurities can be discharged from the sewage discharge pipeline 6 during backwashing, and floating pumice is intercepted by the filtering sieve body 4. The three filter layers are not required to be fixed, and the settling rates are different according to different particle sizes, different gravity and different sedimentation rates, so that when backwashing is finished, the filter layers are firstly settled with large particle sizes, and then settled with small particle sizes, and can be automatically layered and superposed.

In the preferred embodiment, the housing is also provided with a compressed gas inlet 10. Before backwashing, compressed air is used for scrubbing, and the compressed air enters from a compressed air inlet 10. The impurities with larger size are scrubbed into the impurities with smaller size to pass through the filtering sieve body, so that the filtering sieve body is prevented from being blocked by the impurities. Specifically, the shell is provided with a liquid outlet pipeline, and the liquid outlet 3 and the compressed gas inlet 10 are both arranged on the liquid outlet pipeline.

The application also discloses a lyocell fiber solvent recovery system, which is used for filtering impurities in the lyocell fiber solvent and recovering the purified lyocell fiber solvent and comprises a multi-stage filter, wherein the multi-stage filter is the multi-stage filter disclosed in the embodiment, and obviously, the lyocell fiber solvent recovery system with the multi-stage filter also has all the technical effects.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The utility model provides a multistage filter, includes the casing and installs multistage filter layer in the casing, be provided with inlet (1), liquid outlet (3) and drain (2) on the casing, the top layer of multistage filter layer is the pumice layer, its characterized in that still includes back flush filter equipment, back flush filter equipment is including filtering screen frame (4) and sewage pipes (6), filter screen frame (4) and pass through sewage pipes (6) with drain (2) intercommunication, the filtration aperture of filtering screen frame (4) is less than the pumice size of pumice layer (7) just is greater than the impurity size.

2. A multistage filter according to claim 1, characterised in that the filtering screen (4) comprises a plurality of filtering screens, each of which communicates with the sewage conduit (6).

3. The multistage filter of claim 2, wherein said filter screen is a straight or an arcuate tube.

4. The multi-stage filter of claim 2, wherein the number of filter screens is 3-6.

5. The multi-stage filter of any one of claims 1-4, wherein the multi-stage filtration layer further comprises a fine sand layer, the fine sand layer being laid underneath the pumice layer.

6. The multi-stage filter of claim 5, further comprising a gravel layer laid underneath the fine sand layer.

7. Multistage filter according to any of claims 1 to 4, characterised in that the outlet (3) of the multistage filter is connected to a compressed gas inlet (10).

8. Multistage filter according to any of claims 1 to 4, characterised in that the filter screen (4) communicates with the sewage line (6) by means of a joint (5).

9. The multi-stage filter of any of claims 1-4, wherein the backflush filter device is mounted within the housing.

10. A lyocell fibre solvent recovery system including a multi-stage filter according to any one of claims 1 to 9.