A backwash filter for cellulose acetate production

Abstract

This utility model discloses a backwash filter for cellulose acetate production, including a frame, a main filter chamber, a spare chamber, a control box, a slurry outlet pipe, a slurry inlet pipe, a reflux maturation pipe, a first electrically controlled valve, a second electrically controlled valve, and a drain valve. The main filter chamber and the spare chamber are fixed to the frame by clamping kits. Both the main filter chamber and the spare chamber are equipped with an insulation jacket, an upper mounting jacket, a lower mounting jacket, and candle-shaped filter components installed between them. A mounting frame is provided between the candle-shaped filter components, with an inner annular jet pipe on the mounting frame and an outer annular jet pipe on the insulation jacket. A conical slag collection bottom connected to the drain valve is located below the lower mounting jacket. A sensing component is located on the upper part of the slurry outlet pipe. This utility model effectively solves the problems of easy clogging, inconvenient cleaning, poor switching, and insufficient operational stability in existing technologies, and realizes dual-chamber switching, reflux maturation, backwash cleaning, and slag collection and discharge, improving filtration continuity and operational stability.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and more specifically to a backwash filter for cellulose acetate production. Background Technology

[0002] In the production of cellulose acetate, the spinning slurry typically needs to be filtered before entering subsequent processing steps to remove gel particles, impurities, and localized agglomerates, thereby ensuring the stability of slurry delivery and product quality. Most existing filtration devices employ a single filter chamber structure. During continuous production, when impurities adhere to the surface of the filter components, it can easily lead to increased filtration resistance and decreased slurry output efficiency, and in severe cases, it can even affect the continuous operation of the entire production line. Simultaneously, existing devices often suffer from insufficient curing, excessive residue inside the filter chamber, and limited backwashing range during filter chamber switching, internal cleaning, and restarting. This makes it difficult to effectively remove deposits from the filter component surface, and impurities tend to accumulate at the bottom of the chamber and around the filter components, thus affecting subsequent filtration performance.

[0003] Therefore, a Chinese patent discloses a stainless steel candle filter for cellulose acetate spinning, application number (201220368469), which can improve the slurry filtration quality to a certain extent and meet the requirements for use in cellulose acetate spinning production. However, this device is difficult to achieve pre-wetting, temperature maintenance, stable switching, and concentrated discharge of impurities after backwashing in continuous production. It still suffers from problems such as insufficient stability of filter chamber switching, insufficient backwashing, and poor concentration of sewage discharge. Therefore, those skilled in the art provide a backwash filter for cellulose acetate production to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this utility model is to provide a backwash filter for the production of cellulose acetate in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] This utility model proposes a backwash filter for cellulose acetate production, including a frame, on which a main filter chamber, a spare chamber and a control box are provided. The main filter chamber and the spare chamber are both fixedly mounted on the frame by clamping kits.

[0007] The upper parts of the main filtration chamber and the backup chamber are respectively connected to the slurry outlet pipe, the lower parts of the main filtration chamber and the backup chamber are respectively connected to the slurry inlet pipe, the lower parts of the main filtration chamber and the backup chamber are respectively connected to the return maturation pipe, the slurry inlet pipe is equipped with a first solenoid valve, the return maturation pipe is equipped with a second solenoid valve, and the bottom of the main filtration chamber and the backup chamber are respectively connected to the drain valve.

[0008] The main filter chamber and the backup chamber are both equipped with an insulation jacket, an upper mounting jacket and a lower mounting jacket. A candle-shaped filter assembly is vertically arranged between the upper mounting jacket and the lower mounting jacket. An installation frame is arranged between the candle-shaped filter assemblies. An inner annular spray pipe is provided on the installation frame. An outer annular spray pipe is provided on the insulation jacket. A conical slag collection bottom is provided below the lower mounting jacket. The conical slag collection bottom is connected to the drain valve.

[0009] The upper part of the slurry outlet pipe is equipped with a sensing component, and the control box is electrically connected to the first solenoid valve, the second solenoid valve and the sensing component respectively.

[0010] As a preferred embodiment of this utility model, the main filter chamber and the spare chamber are arranged side by side at intervals on the upper part of the frame, the control box is located between the main filter chamber and the spare chamber, and the clamping kit is respectively sleeved on the outer periphery of the main filter chamber and the spare chamber and fixedly connected to the frame.

[0011] As a preferred embodiment of this utility model, the slurry outlet pipe is connected to the side of the corresponding filter chamber, and the connection position is located below the upper mounting layer; the slurry inlet pipe is connected to the side of the corresponding filter chamber, and the connection position is located above the lower mounting layer.

[0012] In a preferred embodiment of this utility model, the upper mounting interlayer is disposed at the upper part of the corresponding filter cavity, the lower mounting interlayer is disposed at the lower part of the corresponding filter cavity, the candle-shaped filter assembly is installed between the upper mounting interlayer and the lower mounting interlayer, and the mounting frame is disposed along the axial direction of the candle-shaped filter assembly.

[0013] As a preferred embodiment of this invention, the inner and outer annular spray pipes are both tilted and aligned with the candle-shaped filter assembly.

[0014] As a preferred embodiment of this utility model, the bottom of the conical slag collection is located below the lower mounting jacket and tapers downwards, and the drain valve is located at the lower end of the bottom of the conical slag collection.

[0015] As a preferred embodiment of this utility model, the thermal insulation interlayer surrounds the inner walls of the main filter cavity and the spare cavity.

[0016] As a preferred embodiment of this utility model, the control box is used to receive the detection signal from the sensing component and control the opening and closing of the first and second solenoid valves.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention features a main filter chamber and a backup chamber mounted on a frame, with a reflux curing pipe, a first electrically controlled valve, and a second electrically controlled valve positioned between them. This allows the main filter chamber and the backup chamber to switch between filtration and standby states. The inclusion of an inner and outer annular jet pipes enables the backwashing action to be more concentrated on the area surrounding the candle-shaped filter assembly. Furthermore, by pre-curing the filter chamber to be used before switching, and with the insulation layer and reflux curing structure working in tandem, the switching preparation time is shortened. This reduces slurry state fluctuations caused by temperature changes during the standby curing phase in the backup chamber, preventing localized viscosity changes, insufficient wetting, or unstable curing effects in the standby chamber. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the main filter chamber and the backup chamber of this utility model.

[0021] Reference numerals in the attached drawings: 1. Main filtration chamber; 2. Backup chamber; 3. Slurry outlet pipe; 4. Slurry inlet pipe; 5. Return curing pipe; 6. First electric control valve; 7. Second electric control valve; 8. Drain valve; 9. Frame; 10. Clamping kit; 11. Control box; 101. Insulation jacket; 102. Candle-shaped filter assembly; 103. Mounting frame; 104. Inner annular jet pipe; 105. Outer annular jet pipe; 106. Upper mounting jacket; 107. Lower mounting jacket; 108. Sensing assembly; 109. Conical slag collection bottom. Detailed Implementation

[0022] Example 1

[0023] like Figures 1 to 2 As shown, this embodiment provides a backwash filter for cellulose acetate production, including a frame 9. The frame 9 is provided with a main filter chamber 1, a spare chamber 2 and a control box 11. The main filter chamber 1 and the spare chamber 2 are both fixedly mounted on the frame 9 by a clamping kit 10.

[0024] The upper parts of the main filter chamber 1 and the backup chamber 2 are respectively connected to the slurry outlet pipe 3, the lower parts of the main filter chamber 1 and the backup chamber 2 are respectively connected to the slurry inlet pipe 4, the lower parts of the main filter chamber 1 and the backup chamber 2 are respectively connected to the return curing pipe 5, the slurry inlet pipe 4 is equipped with a first solenoid valve 6, the return curing pipe 5 is equipped with a second solenoid valve 7, and the bottom of the main filter chamber 1 and the backup chamber 2 are respectively connected to the drain valve 8;

[0025] Both the main filter chamber 1 and the backup chamber 2 are equipped with an insulation jacket 101, an upper mounting jacket 106, and a lower mounting jacket 107. A candle-shaped filter assembly 102 is vertically arranged between the upper mounting jacket 106 and the lower mounting jacket 107. An installation frame 103 is provided between the candle-shaped filter assemblies 102. An inner annular spray pipe 104 is provided on the installation frame 103. An outer annular spray pipe 105 is provided on the insulation jacket 101. A conical slag collection bottom 109 is provided below the lower mounting jacket 107. The conical slag collection bottom 109 is connected to the drain valve 8.

[0026] The upper part of the slurry outlet pipe 3 is provided with a sensing component 108, and the control box 11 is electrically connected to the first solenoid valve 6, the second solenoid valve 7 and the sensing component 108 respectively.

[0027] As a preferred technical solution of this embodiment, the main filter chamber 1 and the spare chamber 2 are arranged side by side at intervals on the upper part of the frame 9, the control box 11 is arranged between the main filter chamber 1 and the spare chamber 2, and the clamping kit 10 is respectively sleeved on the outer periphery of the main filter chamber 1 and the spare chamber 2 and fixedly connected to the frame 9.

[0028] As a preferred technical solution of this embodiment, the slurry outlet pipe 3 is connected to the side of the corresponding filter chamber, and the connection position is located below the upper mounting interlayer 106; the slurry inlet pipe 4 is connected to the side of the corresponding filter chamber, and the connection position is located above the lower mounting interlayer 107.

[0029] As a preferred embodiment, the upper mounting layer 106 is disposed on the upper part of the corresponding filter cavity, the lower mounting layer 107 is disposed on the lower part of the corresponding filter cavity, the candle-shaped filter assembly 102 is installed between the upper mounting layer 106 and the lower mounting layer 107, and the mounting frame 103 is disposed along the axial direction of the candle-shaped filter assembly 102.

[0030] As a preferred technical solution in this embodiment, the inner annular spray pipe 104 and the outer annular spray pipe 105 are both tilted and aligned with the candle-shaped filter assembly 102.

[0031] As a preferred technical solution of this embodiment, the conical slag collection bottom 109 is located below the lower mounting jacket 107 and tapers downward, and the sewage discharge valve 8 is located at the lower end of the conical slag collection bottom 109.

[0032] As a preferred technical solution in this embodiment, the thermal insulation interlayer 101 surrounds the inner wall of the main filter cavity 1 and the spare cavity 2.

[0033] As a preferred technical solution in this embodiment, the control box 11 is used to receive the detection signal from the sensing component 108 and control the opening and closing of the first solenoid valve 6 and the second solenoid valve 7.

[0034] In practical application, this embodiment preferably uses the main filter chamber 1 for filtration and the backup chamber 2 for pre-recirculation maturation. During use, the first electrically controlled valve 6 on the inlet pipe 4 corresponding to the main filter chamber 1 is first opened, allowing the cellulose acetate slurry to enter from the lower part of the main filter chamber 1 and flow upwards to the vicinity of the candle-shaped filter assembly 102. After passing through the candle-shaped filter assembly 102, the slurry is transported to the subsequent work station via the outlet pipe 3 at the upper part of the main filter chamber 1. At this time, the backup chamber 2 does not directly undertake the filtration task but is in a pre-recirculation maturation state as a chamber to be switched.

[0035] In this embodiment, the reflux curing is not simply introducing a small amount of slurry into the backup chamber 2, but rather, through the reflux curing pipe 5 set between the main filter chamber 1 and the lower part of the backup chamber 2, the stable slurry in normal filtration state is refluxed from the lower part of the main filter chamber 1 to the lower part of the backup chamber 2. Since the reflux curing pipe 5 connects the lower parts of the main filter chamber 1 and the backup chamber 2, after the slurry enters the backup chamber 2, it will gradually fill the internal space of the backup chamber 2 from bottom to top, and preferentially wet the area near the lower installation interlayer 107 and the lower part of the candle-shaped filter assembly 102, and then continue to diffuse upward, so that the entire candle-shaped filter assembly 102 gradually completes the pre-wetting from bottom to top. Compared with the method of directly introducing slurry from the top, this embodiment adopts the method of bottom reflux curing, which can reduce the situation of air stagnation around the candle-shaped filter assembly 102 in the backup chamber 2, and allow the slurry to gradually spread along the outer periphery of the candle-shaped filter assembly 102, thereby improving the curing uniformity.

[0036] During the reflux curing process, the control box 11 controls the second solenoid valve 7 to open, allowing some of the slurry in the lower part of the main filter chamber 1 to continuously enter the standby chamber 2 through the reflux curing pipe 5. Since the standby chamber 2 is equipped with an insulation jacket 101 on the outside, the standby chamber 2 can maintain a slurry temperature state that is relatively close to that of the main filter chamber 1 during the curing standby period, thereby reducing the local viscosity change caused by the slurry in the standby chamber 2 due to residence, so that the candle-shaped filter assembly 102 in the standby chamber 2 is in a relatively stable temperature environment while being wetted by the slurry. Thus, the reflux curing not only plays the role of pre-filling and pre-wetting, but also improves the consistency of the curing state with the cooperation of the insulation jacket 101, avoiding short-term unstable slurry output due to slurry temperature difference or insufficient wetting when the standby chamber 2 is switched to use.

[0037] As the reflux maturation continues, the slurry outlet pipe 3 at the top of the spare chamber 2 gradually transitions from a gas-liquid mixed state to a stable slurry state. The sensing component 108 installed at the top of the slurry outlet pipe 3 detects this state and feeds the detection result back to the control box 11. When the sensing component 108 detects that the slurry state at the top of the slurry outlet pipe 3 of the spare chamber 2 tends to be stable, the control box 11 determines that the spare chamber 2 has basically completed maturation. At this time, the candle-shaped filter component 102 inside the spare chamber 2 is fully wetted, and the spare chamber 2 has also completed pre-filling. This method of using the sensing component 108 to judge the maturation state makes the completion time of the reflux maturation of the spare chamber 2 clearer and avoids insufficient or excessive maturation caused by judging solely by empirical time.

[0038] After the main filter chamber 1 has been working for a period of time, if the sensing component 108 detects fluctuations in the slurry discharge state of the main filter chamber 1, or if the control box 11 determines that the main filter chamber 1 needs to exit the current filtration state based on the operating parameters, the control box 11 first keeps the backup chamber 2 in the matured state, and then controls the slurry inlet passage corresponding to the backup chamber 2 to enter the working state, while the main filter chamber 1 gradually exits the online filtration state. Since the backup chamber 2 has completed the pre-filling and pre-wetting from bottom to top through the return matured pipe 5 before switching, and maintains a relatively stable slurry state under the action of the insulation jacket 101, the backup chamber 2 can quickly form a continuous and stable filtration flow path when it is switched into operation, reducing the flow fluctuation at the moment of switching.

[0039] After the main filter chamber 1 exits filtration, it enters the backwashing and sewage discharge process. During backwashing, the inner annular jet pipe 104 and the outer annular jet pipe 105 simultaneously scour the candle-shaped filter assembly 102. Impurities attached to the surface of the candle-shaped filter assembly 102 are detached under the action of scour on both sides and fall downward into the bottom of the conical slag collection 109 under the action of gravity, and are finally discharged through the sewage discharge valve 8. Through the above structure and steps, this embodiment realizes the continuous coordination between the online filtration of the main filter chamber 1, the early reflux maturation of the backup chamber 2, the smooth switching between the two chambers, and the backwashing and sewage discharge of the exit chamber.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A backwash filter for cellulose acetate production, comprising a frame (9), wherein the frame (9) is provided with a main filter chamber (1), a spare chamber (2) and a control box (11), wherein the main filter chamber (1) and the spare chamber (2) are both fixedly mounted on the frame (9) by clamping kits (10). Its features are, The upper parts of the main filter chamber (1) and the backup chamber (2) are respectively connected to the slurry outlet pipe (3), the lower parts of the main filter chamber (1) and the backup chamber (2) are respectively connected to the slurry inlet pipe (4), the lower parts of the main filter chamber (1) and the backup chamber (2) are respectively connected to the return maturation pipe (5), the slurry inlet pipe (4) is provided with a first electric control valve (6), the return maturation pipe (5) is provided with a second electric control valve (7), and the bottom of the main filter chamber (1) and the backup chamber (2) are respectively connected to the drain valve (8). The main filter chamber (1) and the spare chamber (2) are each provided with a heat insulation jacket (101), an upper mounting jacket (106) and a lower mounting jacket (107). A candle-shaped filter assembly (102) is vertically arranged between the upper mounting jacket (106) and the lower mounting jacket (107). An installation frame (103) is provided between the candle-shaped filter assemblies (102). An inner annular spray pipe (104) is provided on the installation frame (103). An outer annular spray pipe (105) is provided on the heat insulation jacket (101). A conical slag collection bottom (109) is provided below the lower mounting jacket (107). The conical slag collection bottom (109) is connected to the drain valve (8). The upper part of the slurry outlet pipe (3) is provided with a sensing component (108), and the control box (11) is electrically connected to the first electric control valve (6), the second electric control valve (7) and the sensing component (108).

2. The backwash filter for cellulose acetate production according to claim 1, characterized in that, The main filter chamber (1) and the spare chamber (2) are arranged side by side at intervals on the upper part of the frame (9). The control box (11) is located between the main filter chamber (1) and the spare chamber (2). The clamping kit (10) is respectively sleeved on the outer periphery of the main filter chamber (1) and the spare chamber (2) and is fixedly connected to the frame (9).

3. The backwash filter for cellulose acetate production according to claim 1, characterized in that, The discharge pipe (3) is connected to the side of the corresponding filter chamber, and the connection position is located below the upper mounting layer (106); the inlet pipe (4) is connected to the side of the corresponding filter chamber, and the connection position is located above the lower mounting layer (107).

4. The backwash filter for cellulose acetate production according to claim 1, characterized in that, The upper mounting layer (106) is disposed on the upper part of the corresponding filter chamber, the lower mounting layer (107) is disposed on the lower part of the corresponding filter chamber, the candle-shaped filter assembly (102) is installed between the upper mounting layer (106) and the lower mounting layer (107), and the mounting frame (103) is disposed along the axial direction of the candle-shaped filter assembly (102).

5. A backwash filter for cellulose acetate production according to claim 1, characterized in that, The inner annular jet pipe (104) and the outer annular jet pipe (105) are both tilted and aligned with the candle-shaped filter assembly (102).

6. A backwash filter for cellulose acetate production according to claim 1, characterized in that, The conical slag collection bottom (109) is located below the lower mounting jacket (107) and tapers downwards, and the drain valve (8) is located at the lower end of the conical slag collection bottom (109).

7. A backwash filter for cellulose acetate production according to claim 1, characterized in that, The thermal insulation interlayer (101) surrounds the inner wall of the main filter chamber (1) and the spare chamber (2).

8. A backwash filter for cellulose acetate production according to claim 1, characterized in that, The control box (11) is used to receive the detection signal from the sensing component (108) and control the opening and closing of the first solenoid valve (6) and the second solenoid valve (7).

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