Settling type continuous filtering and washing device

Abstract

The utility model discloses a settling type continuous filtering and washing device which comprises a settling section, a washing section and a draining section which are connected in sequence. A filtrate side overflow port is formed in the side surface of the settling section cylinder; the washing section comprises one or more sections and is provided with a washing solvent inlet and a filtrate outlet; the stirring shaft is a hollow shaft, a bottom-inserted discharging pipe is arranged in the stirring shaft, a helical ribbon with a hollow structure is mounted on the stirring shaft, and inner cavities of the stirring shaft and the helical ribbon are communicated; the cylinder wall of the three-part cylinder is of a single-layer steel plate or double-layer jacket structure, the inner wall of the double-layer jacket structure is a composite plate of a three-layer structure formed by clamping a layer of metal sintering filter screen between two layers of pore plates, and a filtrate discharge port is formed in the lower part of the outer wall of the settling section cylinder; the shaft wall of the stirring shaft and the helical ribbon can be completely or partially made of composite plates; filtrate is filtered, enters a barrel jacket or a stirring shaft and an inner cavity of a helical ribbon and is discharged; and the slurry slag is discharged by the discharge valve. The slurry separation device is suitable for separation of slurry with solids, and continuous large-scale production can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of solid-liquid separation technology, specifically relating to a sedimentation-type continuous filtration and washing device. Background Technology

[0002] Chemical production processes often involve solid-liquid separation, which is a crucial unit operation and a vital component of heterogeneous separation. Filtration and separation equipment is a core component in many production processes. Among these, the three-in-one filter-washer-dryer is a widely used batch-type, fully enclosed process device in the chemical, fine chemical, and pharmaceutical industries for solid-liquid separation, washing, and drying. However, it involves numerous repetitive operations, resulting in high energy consumption. During solid-liquid separation, the separated solid material accumulates on the filter plate surface, affecting the efficiency of subsequent solid-liquid separation operations and potentially causing production equipment malfunctions.

[0003] Chinese patent application publication number CN117504406A discloses a glass-lined three-in-one filter washing and drying device. During the solid-liquid separation process, the stirring component, support component, and shaking component work together to stir the inside of the operating tank while driving the operating tank to tilt to different positions and then reset, causing the inside of the operating tank to shake. By shaking the operating tank, the solid material after separation is prevented from accumulating on the filter plate and blocking the filter plate in some places. However, this solution cannot achieve complete and effective solid-liquid separation and cannot achieve continuous production.

[0004] Therefore, this utility model provides a sedimentation-type continuous filtration and washing device to solve the problems mentioned in the background art. Utility Model Content

[0005] The problem this invention aims to solve is that during solid-liquid separation, the separated solid material accumulates on the surface of the filter plate, affecting the efficiency of subsequent solid-liquid separation operations and preventing continuous production.

[0006] The purpose of this utility model is to overcome the defects in the existing technology and provide a sedimentation continuous filtration and washing device, which includes three parts of the cylinder: sedimentation section, washing section and filtration section, which are connected in sequence. There is a stirring shaft inside the cylinder. The upper part of the stirring shaft is driven by a motor through a reducer and passes through the interior of the three parts of the cylinder: sedimentation section, washing section and filtration section.

[0007] As a further technical solution, a slurry inlet is provided in the middle of the settling section cylinder, the slurry inlet is connected to a valve and connected to a slurry conveying pipeline, the side of the settling section cylinder is provided with a filtrate overflow port for settling and clarification, and the bottom is provided with a filtrate outlet; the cylinder wall of the settling section cylinder can be a single-layer structure or a double-layer jacketed structure; the inner wall of the double-layer jacketed structure is a three-layer composite plate with two perforated plates sandwiching a metal sintered filter screen in the middle, the outer wall of the jacket is a solid steel plate, and the bottom is provided with a filtrate discharge port.

[0008] As a further technical solution, the washing section can be composed of one or more sections of cylinder. The cylinder wall of the washing section can be a single-layer structure or a double-layer jacketed structure. The inner wall of the double-layer jacketed structure is a composite plate with a three-layer structure consisting of two perforated plates sandwiching a metal sintered filter screen in the middle. The outer wall of the jacket is a solid steel plate. Each section of the cylinder jacket has a washing solvent inlet at the top and a filtrate outlet at the bottom.

[0009] As a further technical solution, the cylinder wall of the filtration section can be a single-layer structure or a double-layer jacketed structure; the inner wall of the double-layer jacketed structure is a three-layer composite plate with two perforated plates sandwiching a metal sintered filter screen in the middle, the outer wall of the jacket is a solid steel plate, and a filtrate discharge port is provided at the lower part of the outer wall of the jacket; the lower part of the filtration section cylinder is equipped with a bushing or bearing to support the stirring shaft, and an automatically opening, closing or regulating slurry discharge valve is installed at the bottom outlet.

[0010] As a further technical solution, the stirring shaft is a hollow shaft with a helical ribbon installed on it. The helical ribbon has a hollow structure. A bottom-inserting discharge pipe is installed inside the stirring shaft, with its top end connected to a filtrate pipe. The shaft wall and the helical ribbon can both be entirely or partially composed of a three-layer composite plate with two perforated plates sandwiching a layer of sintered metal filter screen. The hollow inner cavity of the stirring shaft is connected to the inner cavity of the helical ribbon. The filtrate is filtered into the inner cavity through the composite plate of the shaft wall and the helical ribbon, and discharged through the top outlet of the bottom-inserting discharge pipe in the stirring shaft. The bottom end of the stirring shaft is a solid shaft, fixed and supported by a bushing or bearing. If necessary, several bearings or bushings can be installed and fixed at the connection point of the three sections of the stirring shaft, namely the settling section, washing section, and filtration section. The rotational speed of the stirring shaft can be adjusted according to the solid content of the slurry using a reducer and a frequency converter. The helical ribbon can be segmented or a continuous, zigzag-shaped helical ribbon.

[0011] As a further technical solution, the materials of the three sections of the cylinder—sedimentation section, washing section, and filtration section—are one of carbon steel, glass enamel, stainless steel, steel lined with plastic, steel internally coated with plastic, titanium, and alloy steel; the materials of the stirring shaft and the screw ribbon are one of carbon steel, stainless steel, titanium, and alloy steel.

[0012] As a further technical solution, the upper part of the settling section cylinder is also equipped with an evaporation gas phase outlet, a thermometer port, a pressure gauge port, a nitrogen inlet, a sight glass hole, a vent port, and multiple spare ports.

[0013] As a further technical solution, the wall of the settling section cylinder, the stirring shaft, and the spiral ribbon are not all solid structures at the same time.

[0014] As a further technical solution, the cylinder wall, stirring shaft, and spiral ribbon of the washing section are not all solid structures at the same time.

[0015] As a further technical solution, the cylinder wall, stirring shaft, and spiral ribbon of the filtration section are not all solid structures at the same time.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In the solid-liquid separation process, this utility model utilizes a composite plate with a three-layer structure, consisting of a metal sintered filter screen, an external perforated plate, and the inner walls of the settling section, washing section, filtration section, stirring shaft, and spiral ribbon. This three-layer composite plate effectively improves filtration efficiency, reduces the solid content in the filtrate, and allows for effective separation of the filtrate and slurry. The filtrate is then thoroughly washed in the washing section, and the filtrate is collected, thus achieving continuous production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a sedimentation-type continuous filtration and washing device according to this utility model.

[0019] Figure 2 This is an enlarged view of the composite plate with a three-layer structure consisting of an internal metal sintered filter screen and an external perforated plate, as described in this utility model.

[0020] Figure 3 This is a top view of the fixed installation of the stirring shaft in this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] A-1, Settling section; A-2, Washing section; A-3, Filtration section; B, Stirring shaft; C, Slurry inlet; D, Slurry / residue discharge valve; E, Bottom discharge pipe; F, Motor; G, Filtrate outlet; H, Washing solvent inlet; P, Filtrate outlet; J, Filtrate outlet; K, Screw ribbon; L, Sintered metal filter screen; M, Perforated plate; N, Bearing; R, Spare port; Q1, Side overflow port. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Similarly, the terms "installed," "connected," "attached," and "fixed" should be interpreted broadly, encompassing both fixed and detachable connections; mechanical and electrical connections; and direct and indirect connections via an intermediate medium. Those skilled in the art will understand the specific meaning of these terms in this invention according to the specific circumstances.

[0025] This utility model provides a sedimentation-type continuous filtration and washing device, which includes three cylindrical sections: sedimentation section A-1, washing section A-2, and filtration section A-3, which are connected in sequence. Inside the cylindrical section is a stirring shaft B, the upper part of which is driven by a motor F through a reducer and passes through the interior of the three cylindrical sections: sedimentation section A-1, washing section A-2, and filtration section A-3.

[0026] The middle part of the settling section A-1 cylinder is provided with a slurry inlet C, which is connected to a valve and a slurry conveying pipeline. The side of the settling section A-1 cylinder is provided with a filtrate overflow port Q1 for settling and clarification. The cylinder wall of the settling section A-1 cylinder can be a single-layer structure or a double-layer jacketed structure. The inner wall of the double-layer jacketed structure is a three-layer composite plate with two perforated plates M sandwiching a metal sintered filter screen L in the middle. The outer wall of the jacket is a solid steel plate, and a filtrate discharge port G is provided at the bottom.

[0027] The washing section A-2 can be composed of one or more sections of cylinder. The cylinder wall of the washing section A-2 can be a single-layer structure or a double-layer jacketed structure. The inner wall of the double-layer jacketed structure is a composite plate with a three-layer structure consisting of two perforated plates M sandwiching a metal sintered filter screen L in the middle. The outer wall of the jacket is a solid steel plate. Each section of the cylinder jacket has a washing solvent inlet H at the top and a filtrate outlet P at the bottom.

[0028] The cylinder wall of the filtration section A-3 can be a single-layer structure or a double-layer jacketed structure; the inner wall of the double-layer jacketed structure is a three-layer composite plate with two perforated plates M sandwiching a metal sintered filter screen L in the middle, and the outer wall of the jacket is a solid steel plate. The lower part of the outer wall of the jacket is provided with a filtrate discharge port J; the lower part of the filtration section A-3 cylinder is equipped with a bushing or bearing to support the stirring shaft B, and the bottom outlet is equipped with an automatically opening and closing or regulating slurry discharge valve D.

[0029] The stirring shaft B is a hollow shaft, and a helical ribbon K is installed on it. The helical ribbon K has a hollow structure. The stirring shaft B has a bottom-inserting discharge pipe E, the top of which is connected to the filtrate pipe. The shaft wall of the stirring shaft B and the helical ribbon K can be entirely or partially a three-layer composite plate with two perforated plates M sandwiching a metal sintered filter screen L in between. The hollow inner cavity of the stirring shaft B is connected to the inner cavity of the helical ribbon K. The filtrate is filtered into the inner cavity through the composite plate of the shaft wall and the helical ribbon of the stirring shaft B, and discharged through the top outlet of the bottom-inserting discharge pipe E in the stirring shaft. The bottom end of the stirring shaft B is a solid shaft, which is fixed and supported by a bushing or bearing. If necessary, several bearings or bushings can be installed and fixed at the middle part of the stirring shaft B, that is, at the connection of the three parts of the cylinder: the settling section A-1, the washing section A-2, and the filtration section A-3. The rotation speed of the stirring shaft B can be adjusted according to the solid content of the slurry by a reducer and a frequency converter. The helical ribbon K can be a segmented or zigzag continuous helical ribbon.

[0030] The materials of the three sections of the cylinder—sedimentation section A-1, washing section A-2, and filtration section A-3—are one of carbon steel, enamel, stainless steel, steel lined with plastic, steel internally coated with plastic, titanium, and alloy steel; the materials of the stirring shaft B and the screw ribbon K are one of carbon steel, stainless steel, titanium, and alloy steel.

[0031] The upper part of the settling section A-1 cylinder is also equipped with an evaporation gas phase outlet, thermometer port, pressure gauge port, nitrogen inlet, sight glass hole, vent port, and multiple spare ports R.

[0032] The settling section A-1 cylinder's wall, agitator shaft, and helical ribbon are not simultaneously solid structures. The washing section A-2 cylinder's wall, agitator shaft, and helical ribbon are not simultaneously solid structures. The filtration section A-3 cylinder's wall, agitator shaft, and helical ribbon are not simultaneously solid structures.

[0033] Example

[0034] The settling section A-1 has a slurry inlet C in the middle, which is connected to a valve and a slurry conveying pipeline. The upper part of the settling section A-1 has an overflow port Q1 for the filtrate from settling and clarification. The washing section A-2 can consist of one or more sections, each with a washing solvent inlet H. The stirring shaft B is a hollow shaft driven by a motor and runs through the interior of all three sections. A hollow spiral ribbon K is installed on the stirring shaft B. When the stirring shaft B rotates, the spiral ribbon K provides a downward pushing force to the settling slurry, discharging it downwards. A bottom-inserting discharge pipe E is installed inside the stirring shaft B, with its top connected to the filtrate pipeline. The walls of the three sections—settling section A-1, washing section A-2, and filtration section A-3—can be single-layer steel plates or double-layer steel plates. The cylinder has a double-layer jacket structure. The inner wall of the double-layer jacket structure is a composite plate with a three-layer structure consisting of two perforated plates M and a metal sintered filter screen L sandwiched in between. The lower part of the outer wall of the settling section A-1 cylinder is equipped with a filtrate discharge port G. The shaft wall of the stirring shaft B and the spiral ribbon K can be entirely or partially composed of a three-layer composite plate with two perforated plates M and a metal sintered filter screen L sandwiched in between. The inner cavity of the stirring shaft B is connected to the inner cavity of the spiral ribbon K. The filtrate can be filtered through the composite plate of the inner walls of each part of the cylinder, the shaft wall of the stirring shaft B, and the spiral ribbon K to enter the jacket of the cylinder or the inner cavity of the stirring shaft B and the spiral ribbon K, and discharged through the jacket discharge port of the cylinder and the top outlet of the bottom discharge pipe in the stirring shaft B. The bottom of the filter section A-3 cylinder is equipped with an automatically opening and closing or regulating slurry discharge valve D to achieve automatic and continuous discharge of the slurry after settling and filtration.

[0035] Taking the solid-liquid separation process in the preparation of vinylene carbonate as an example, the heterogeneous slurry after the reaction mainly includes methyl tert-butyl ether, vinylene carbonate, triethylamine hydrochloride and other impurities.

[0036] Taking data measured during a certain production process as an example, the stirring shaft rotates at 50 rpm. The original slurry composition is 60% methyl tert-butyl ether, 6% vinylene carbonate, and 34% triethylamine hydrochloride. After sedimentation, the slurry composition is measured to be 30% methyl tert-butyl ether, 3% vinylene carbonate, and 67% triethylamine hydrochloride. After two washing stages with methyl tert-butyl ether, the slurry content is measured to be 30.9% methyl tert-butyl ether, 0.2% vinylene carbonate, and 68.9% triethylamine hydrochloride. After solid-liquid separation in the filtration dry stage, the slurry content is measured to be 15.3% methyl tert-butyl ether, 0.1% vinylene carbonate, and 84.6% triethylamine hydrochloride, achieving separation of filtrate and slurry residue, and a high yield of the target product, vinylene carbonate.

[0037] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. The above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sedimentation-type continuous filtration and washing device, characterized in that, The cylinder consists of three sections: a settling section (A-1), a washing section (A-2), and a filtration section (A-3), which are connected in sequence. Inside the cylinder is a stirring shaft (B), the upper part of which is driven by a motor (F) through a reducer, and it runs through the interior of the three sections: the settling section (A-1), the washing section (A-2), and the filtration section (A-3).

2. The sedimentation-type continuous filtration and washing device according to claim 1, characterized in that, The sedimentation section (A-1) cylinder is provided with a slurry inlet (C) in the middle, which is connected to a valve and a slurry conveying pipeline. The sedimentation section (A-1) cylinder is provided with a sedimentation and clarification filtrate overflow port (Q1) on the side. The cylinder wall of the sedimentation section (A-1) cylinder is a single-layer structure or a double-layer jacketed structure. The inner wall of the double-layer jacketed structure is a three-layer composite plate with two perforated plates (M) sandwiched in the middle with a metal sintered filter screen (L). The outer wall of the jacket is a solid steel plate, and a filtrate discharge port 1 (G) is provided at the bottom.

3. The sedimentation-type continuous filtration and washing device according to claim 1, characterized in that, The washing section (A-2) consists of one or more sections of cylinder. The cylinder wall of the washing section (A-2) is a single-layer structure or a double-layer jacketed structure. The inner wall of the double-layer jacketed structure is a composite plate with a three-layer structure consisting of two perforated plates (M) sandwiched in the middle with a metal sintered filter screen (L). The outer wall of the jacket is a solid steel plate. Each section of the cylinder jacket has a washing solvent inlet (H) at the top and a filtrate outlet 2 (P) at the bottom.

4. The sedimentation-type continuous filtration and washing device according to claim 1, characterized in that, The cylinder wall of the filter section (A-3) is a single-layer structure or a double-layer jacketed structure; the inner wall of the double-layer jacketed structure is a composite plate with a three-layer structure consisting of two perforated plates (M) sandwiching a metal sintered filter screen (L), the outer wall of the jacket is a solid steel plate, and a filtrate outlet 3 (J) is provided at the lower part of the outer wall of the jacket; the lower part of the filter section (A-3) is equipped with a bushing or bearing to support the stirring shaft (B), and an automatically opening, closing or regulating slurry discharge valve (D) is installed at the bottom outlet.

5. A sedimentation-type continuous filtration and washing device according to claim 1, characterized in that, The stirring shaft (B) is a hollow shaft, and a spiral ribbon (K) is installed on the stirring shaft (B). The spiral ribbon (K) has a hollow structure. A bottom-inserting discharge pipe (E) is installed inside the stirring shaft (B), and its top end is connected to a filtrate pipe. The shaft wall of the stirring shaft (B) and the spiral ribbon (K) can both be entirely or partially a three-layer composite plate consisting of two perforated plates (M) with a metal sintered filter screen (L) sandwiched in between. The hollow inner cavity of the stirring shaft (B) is connected to the inner cavity of the spiral ribbon (K). The filtrate is filtered into the inner cavity through the composite plate of the stirring shaft (B) shaft wall and the spiral ribbon, and then... The bottom discharge pipe (E) in the stirring shaft discharges material from the top outlet; the bottom end of the stirring shaft (B) is a solid shaft and is fixed and supported by bushings or bearings; if necessary, several bearings or bushings can be installed and fixed at the middle part of the stirring shaft (B), i.e., at the connection of the three parts of the cylinder: sedimentation section (A-1), washing section (A-2), and filtration section (A-3); the rotational speed of the stirring shaft (B) can be adjusted according to the solid content of the slurry by a reducer and a frequency converter; the spiral ribbon (K) can be a segmented or zigzag continuous spiral ribbon.

6. A sedimentation-type continuous filtration and washing device according to claim 5, characterized in that, The materials of the three sections of the cylinder, namely the settling section (A-1), washing section (A-2), and filtration section (A-3), are carbon steel, glass enamel, stainless steel, steel lined with plastic, steel with internal plastic coating, titanium, and alloy steel; the materials of the stirring shaft (B) and the screw ribbon (K) are carbon steel, stainless steel, titanium, and alloy steel.

7. A sedimentation-type continuous filtration and washing device according to claim 2, characterized in that, The upper part of the settling section (A-1) cylinder is also equipped with an evaporation gas phase outlet, a thermometer port, a pressure gauge port, a nitrogen inlet, a sight glass, a vent port, and multiple spare ports (R).

8. A sedimentation-type continuous filtration and washing device according to claim 2 or 5, characterized in that, The wall, stirring shaft, and spiral ribbon of the settling section (A-1) cylinder are not all solid structures.

9. A sedimentation-type continuous filtration and washing device according to claim 3 or 5, characterized in that, The cylinder wall, stirring shaft, and spiral ribbon of the washing section (A-2) are not all solid structures.

10. A sedimentation-type continuous filtration and washing device according to claim 2 or 5, characterized in that, The cylinder wall, stirring shaft, and spiral ribbon of the filter section (A-3) are not all solid structures.

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