A filtration and purification system

Abstract

The present application relates to a kind of filtering purification systems, including raw material tank, heater, filter, filter core, cleaning fluid circulating tank and filter residue collector.Filter is set as upper shell and lower shell, upper shell is connected with backwash intake pipeline, raw material tank and filter are all installed with heater outside;Lower shell is connected with the flow inlet of filter residue collector, upper shell is connected with the flow outlet of filter residue collector, and cleaning fluid circulating tank is arranged on the pipeline of upper shell and the flow outlet of filter residue collector.Cleaning fluid is circulated from top to bottom and washes the surface of filter core of filter, and high-pressure gas is intermittently introduced into permeation side, forms bubble flow, bubble flow not only has backwash effect under high pressure, but also forms airflow brush with circulating liquid, and washes filter core;Online regeneration effect is strengthened, effectively solve the problem of filter core channel blockage and surface stickiness when filtering high-viscosity liquid, and filter residue collector is additionally arranged on circulating pipeline, so as to facilitate the collection of filter residue.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of filtration, in particular to a filtering and purifying system. BACKGROUND

[0002] Coal tar pitch, catalytic slurry oil and ore slurry are important in industrial applications as high solid content viscous liquids. For example, clean slurry oil obtained by filtering the catalytic slurry oil to remove catalyst powder can be used for high value-added products such as carbon black or rubber filler, needle coke, carbon fiber, etc. Not only can it improve the utilization rate of resources, but also reduce the pollution to the environment. However, the flow properties of high solid content viscous liquids are greatly affected by the solid content, and the viscosity increases with the increase of solid particle content. The presence of solid particles increases the internal friction of the fluid, thereby affecting its rheological properties, which brings not small challenges to production and application. When dealing with high solid content viscous liquids, the selection of filtration technology needs to consider many factors, including the degree of medium blockage, viscosity, corrosion resistance and heat resistance, etc. High viscosity liquids often exhibit pseudoplastic behavior, i.e. the apparent viscosity decreases with increasing shear rate. At room temperature, the viscosity of the body fluid is very large, the filtration separation resistance is large, and the efficiency is low, and usually the liquid needs to be heated to reduce the viscosity. Patent CN114870463A discloses a filter suitable for high viscosity medium and a filtering method thereof, and a back flushing component is arranged in the filter to automatically clean the filter and improve the service life of the filter. However, the filter does not install a heater, and when high viscosity liquid enters the filter, it cannot guarantee that the liquid is at a suitable filtration temperature, thereby affecting the filtration efficiency.

[0003] To ensure the stability and continuity of the filtration effect, the filter element will be back-flushed after a period of filtration to empty the solid particles intercepted in the filter. Patent CN213823686U discloses an ultra-high pressure high viscosity filter, which improves the filtration efficiency of high solid content viscous liquid through a series of structural design and use, but the filter lacks a back-flushing component, and the equipment cannot maintain long-term operation. The prior art has poor backwashing effect or high operation cost and complicated process during backwashing, which affects the production efficiency. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a filtering and purifying system, a heater is installed outside the raw material tank and the filter, which effectively reduces the viscosity of the material; the cleaning pump after filtration circulates the cleaning liquid from top to bottom to flush the surface of the filter element of the filter, and intermittently introduces high pressure gas to the permeation side to form a bubble flow, which not only has a backwashing effect under high pressure, but also forms a gas flow brush with the circulating liquid to flush the filter element; the online regeneration effect is strengthened, effectively solving the problems of filter element channel blockage and surface adhesion of high viscosity liquid during filtration, and a filter residue collector is additionally arranged on the circulating pipeline to facilitate the collection of filter residue.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0006] A filter purification system, the filter is provided with an upper shell, a lower shell and a filter core, the filter core is arranged in the lower shell, the lower shell is connected with a raw material tank through a pipeline, a feed pump is arranged on the pipeline between the lower shell and the raw material tank, the upper shell is connected with a backwashing air inlet pipeline, a heater is arranged outside the raw material tank and the filter, the lower shell of the filter is connected with an inlet of a filter residue collector through a pipeline, the upper shell of the filter is connected with an outlet of the filter residue collector through a pipeline, a cleaning pump and a cleaning liquid circulating tank are arranged on the pipeline between the upper shell of the filter and the outlet of the filter residue collector in sequence.

[0007] The present application is further provided that a tube plate is arranged between the upper shell and the lower shell of the filter, a connecting port is arranged on the tube plate, pressure gauges are arranged on the shells on both sides of the tube plate, backwashing is performed when the pressure difference between the two sides of the tube plate reaches a set value, the bottom end of the filter core is closed, and a connecting head matched with the connecting port is arranged at the top end of the filter core, the connecting head is in sealed connection with the tube plate, and the connecting head is used for connecting the two sides of the tube plate.

[0008] The present application is further provided that a cleaning liquid inflow pipeline is connected with the upper shell of the filter, which is used for flushing the surface of the filter core from top to bottom and from inside to outside, a cleaning liquid feed valve and a cleaning pump are connected with the cleaning liquid inflow pipeline, a backwashing air inlet pipeline is connected with the upper shell of the filter, a backwashing air inlet valve and a flow meter are connected with the backwashing air inlet pipeline, which are used for intermittently introducing high-pressure gas into the permeation pressure side of the filter to form a bubble flow and a gas flow brush during backwashing.

[0009] The present application is further provided that a feed pipeline is connected with the lower shell of the filter, a feed pump and a feed valve are arranged on the feed pipeline, a filtrate outflow pipeline is connected with the upper shell of the filter, a discharge valve is arranged on the filtrate outflow pipeline, and an exhaust pipeline is connected with the upper shell of the filter, a vent valve is arranged on the exhaust pipeline.

[0010] The present application is further provided that the lower shell of the filter is connected with an inlet of a filter residue collector through a pipeline, a cleaning liquid discharge valve is arranged on the connecting pipeline, and a purge pipeline and a residue discharge pipeline are connected with the filter residue collector respectively for collecting filter residue, a backblowing valve is arranged on the purge pipeline, and a residue discharge valve is arranged on the residue discharge pipeline.

[0011] The present application further provides a use method of the filter purification system, which comprises the following steps:

[0012] During the filtering operation, the heater is turned on to heat the raw material tank and the filter, when the temperature reaches the set temperature, the feed pump, the feed valve and the discharge valve are opened, the raw material enters the lower shell of the filter, passes through the filter core from outside to inside, and the filter residue is retained on the outer surface of the filter core to form a filter cake; the filtered filtrate is discharged through the flow-out pipeline; the thickness of the filter cake increases with the filtering time during the filtering operation.

[0013] During the backwashing operation, when the pressure difference displayed by the two pressure gauges on the filter reaches 100-200 kPa, the feed pump, the feed valve and the discharge valve are closed, the cleaning liquid feed valve, the cleaning liquid discharge valve and the cleaning pump are opened, the cleaning liquid flows from the upper shell of the filter into the lower shell through the filter core, continuously flushing the surface of the filter core, at the same time, the backwashing air inlet valve is opened, high-pressure gas is intermittently introduced into the permeation side of the filter to form a bubble flow, the bubble flow not only has a backwashing effect under the action of high pressure, but also forms a gas flow brush with the circulating liquid to flush the filter core; all the filter residues flushed out during the backwashing operation are collected by the filter residue collector.

[0014] During the residue collection operation, the blowback valve and the residue discharge valve are opened, and the other valves are closed, high-pressure gas is introduced to blow out the filter residues collected by the filter residue collector through the residue discharge pipeline.

[0015] The raw material tank and the filter are preferably heated to a temperature of 160-240 DEG C; and / or,

[0016] The backwashing is performed when the pressure difference between the two sides of the filter tube plate reaches the set 100-200 kPa; and / or,

[0017] The backwashing air inlet flow rate is set to 10-1000 L / min, and the interval of the intermittent air inlet time is 1-30 s; and / or,

[0018] The blowback air inlet flow rate is set to 10-1000 L / min; and / or,

[0019] The cleaning liquid is a low-hydrocarbon compound such as diesel oil, gasoline and petroleum ether.

[0020] In summary, the present application has the following beneficial effects:

[0021] (1) The raw material tank and the filter of the present application are provided with a heater, which ensures that the temperature of the high-solid-containing viscous liquid entering the filter is in a suitable working condition during the filtering operation, and prevents the high-solid-containing viscous liquid from blocking the filter; during the backwashing operation, the cleaning liquid is continuously heated during the circulating flushing of the filter core, so that the temperature of the cleaning liquid continuously approaches the filtering temperature of the high-solid-containing viscous liquid, thereby enhancing the backwashing effect;

[0022] (2) The present invention is equipped with a backwashing device. The cleaning pump circulates the cleaning liquid from top to bottom to flush the filter element surface of the filter, and intermittently introduces high-pressure gas into the permeation side to form a bubble flow. Under high pressure, the bubble flow not only plays a backwashing role, but also forms an airflow brush with the circulating liquid to flush the filter element surface; it enhances the online regeneration effect and effectively solves the problem of filter element pore blockage and surface adhesion when high viscosity liquid is filtered.

[0023] (3) The present invention is equipped with a filter cake collector. The filter cake that is backwashed is collected by the filter cake collector and discharged by backflushing, which facilitates the collection of filter cake.

[0024] (4) The filtration system of the present invention can be used repeatedly for a long time and the equipment maintenance cost is low. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a filtration and purification system according to an embodiment of the present invention;

[0026] 1-Raw material tank, 2-Heater, 3-Filter, 4-Feed pump, 5-Filter element, 6-Cleaning pump, 7-Cleaning liquid circulation tank, 8-Filter residue collector, 9-Feed valve, 10-Discharge valve, 11-Vent valve, 12-Backwash air inlet valve, 13-Flow meter, 14-Cleaning liquid discharge valve, 15-Cleaning liquid feed valve, 16-Backflush valve, 17-Slag discharge valve, 31-Upper shell, 32-Lower shell. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] In one implementation case, such as Figure 1 The diagram shows a filtration and purification system, comprising a raw material tank 1, a heater 2, a filter 3, a feed pump 4, a filter element 5, a cleaning pump 6, a cleaning liquid circulation tank 7, and a filter residue collector 8. The filter 3 consists of an upper housing 31, a lower housing 32, and a filter element 5. The filter element 5 is housed within the lower housing 32, which is connected to the raw material tank 1 via a pipeline. The feed pump 4 is installed on the pipeline between the lower housing 32 and the raw material tank 1. The upper housing 31 is connected to a backwash air inlet pipeline. Heaters 2 are installed on the exterior of both the raw material tank 1 and the filter 3. The lower housing 32 of the filter is connected to the inlet of the filter residue collector 8 via a pipeline, and the upper housing 31 is connected to the outlet of the filter residue collector 8 via a pipeline. The cleaning pump 6 and the cleaning liquid circulation tank 7 are sequentially installed on the pipeline connecting the upper housing 31 and the outlet of the filter residue collector 8.

[0029] During the operation of the filter purification system, the heater 2 first heats the raw catalytic oil slurry to reduce the viscosity. When the temperature reaches 200℃, the feed pump 4, the feed valve 9 and the discharge valve 10 are opened, the catalytic oil slurry enters the lower shell 32 of the filter, passes through the filter core 5 from outside to inside, the catalyst particles in the oil slurry are intercepted by the filter core 5 to form a filter cake on the surface, the thickness of the filter cake increases with the filtration time, and the filtrate flows out of the pipeline from the top end; when the pressure difference of the two pressure gauges on the tube plate reaches 150kPa, the filter 3 is backwashed, the feed pump 4, the feed valve 9 and the discharge valve 10 are closed, the cleaning pump 6, the cleaning liquid feed valve 15 and the cleaning liquid discharge valve 14 are opened, and the diesel oil flows into the upper shell 31 of the filter from top to bottom to continuously circulate and flush the surface of the filter core 5. The diesel oil is heated during the circulation process, and the temperature continuously approaches the oil slurry filtration temperature. At the same time, the backwashing air inlet valve 12 is opened, 500L / min high-pressure nitrogen gas is intermittently introduced into the permeation pressure side of the filter 3 to form a bubble flow, and the bubble flow not only has a backwashing effect under the action of high pressure, but also forms an air flow brush with the circulating liquid to flush the surface of the filter core. The online regeneration effect is strengthened, the problems of filter core channel blockage and surface adhesion of high-viscosity liquid during filtration are effectively solved, and all the catalyst particles backwashed are collected by the filter residue collector 8.

[0030] In the above embodiment, the pipe plate is installed between the upper shell 31 and the lower shell 32 of the filter, the connecting port is arranged on the pipe plate, the pressure gauges are arranged on the shells on the two sides of the pipe plate, and the backwashing operation is performed when the pressure difference displayed by the two pressure gauges reaches 150kPa. The bottom end of the filter core 5 is closed, and the top end is provided with a connecting head matched with the connecting port. The connecting head is in sealed connection with the pipe plate, and the connecting head is used for connecting the two sides of the pipe plate. Preferably, the filter cores of the filter and the filter residue collector are both sintered from stainless steel metal powder, and the filtration precision is 100μm.

[0031] In the above embodiment, the cleaning liquid inflow pipeline is connected to the upper shell 31 of the filter for flushing the filter core 5 from top to bottom and from inside to outside. The cleaning liquid feed valve 15 and the cleaning pump 6 are connected to the cleaning liquid inflow pipeline. When backwashing, the cleaning liquid discharge valve 14, the cleaning liquid feed valve 15 and the cleaning pump 6 are opened, the diesel oil circulates through the filter and is continuously heated, and the temperature approaches the filtration temperature of the catalytic oil slurry.

[0032] In the above embodiment, the backwashing air inlet pipeline is connected to the upper shell 31 of the filter. The backwashing air inlet valve 12 and the flowmeter 13 are connected to the backwashing air inlet pipeline for intermittently introducing 500L / min high-pressure nitrogen gas into the permeation pressure side of the filter 3 to form a bubble flow. The bubble flow not only has a backwashing effect under the action of high pressure, but also forms an air flow brush with the circulating liquid to flush the surface of the filter core.

[0033] In the above embodiment, the lower filter shell 32 is connected with a feed pipeline, the feed pipeline is provided with a feed pump 4 and a feed valve 9, the upper filter shell 31 is connected with a filtrate outflow pipeline, the filtrate outflow pipeline is provided with a discharge valve 10, the upper filter shell 31 is connected with an exhaust pipeline, the exhaust pipeline is provided with a vent valve 11, when the internal pressure of the filter 3 is too large, the vent valve 11 is opened to release the pressure inside the filter.

[0034] In the above embodiment, the lower filter shell 32 is connected with the flow inlet of the filter residue collector 8 through a pipeline, the connecting pipeline is provided with a cleaning liquid discharge valve 14, the filter residue collector 8 is respectively connected with a purging pipeline and a residue discharge pipeline, the purging pipeline is provided with a back flushing valve 16, and the residue discharge pipeline is provided with a residue discharge valve 17; the back flushing valve 16 is opened to blow out the filter residue collected by the filter residue collector 8.

[0035] The application further provides a use method of the above-mentioned filter purification system, please refer to Figure 1 , comprising the following steps:

[0036] During the filtration operation, the heater 2 is opened to heat the raw material tank 1 and the filter 3, when the temperature reaches 200℃, the feed pump 4, the feed valve 9 and the discharge valve 10 are opened, the raw material enters the lower filter shell 32, passes through the filter core 5 from outside to inside, and the catalyst particles are intercepted on the outer surface of the filter core 5 to form a filter cake; the filtered filtrate is discharged through the outflow pipeline; wherein the thickness of the catalyst particles increases with the filtration time.

[0037] During the backwashing operation, when the pressure difference of the two sides of the tube plate reaches 150kPa, the feed pump 4, the feed valve 9 and the discharge valve 10 are closed, the cleaning liquid feed valve 15, the cleaning liquid discharge valve 14 and the cleaning pump 6 are opened, the cleaning liquid flows from the upper filter shell 31 to the lower filter shell 32 through the filter core 5, continuously flushing the surface of the filter core 5, at the same time, the backwashing air inlet valve 12 is opened, 500L / min high-pressure nitrogen gas is intermittently introduced into the permeation pressure side of the filter 3, a bubble flow is formed, the bubble flow not only has a backwashing effect under the action of high pressure, but also forms a gas flow brush with the circulating liquid to flush the surface of the filter core; the online regeneration effect is strengthened, the problems of filter core channel blockage and surface adhesion of high-viscosity liquid during filtration are effectively solved, and all the filter residues flushed out by backwashing are collected by the filter residue collector 8.

[0038] During the residue collection operation, the back flushing valve 16 and the residue discharge valve 17 are opened, and other valves are closed, 500L / min high-pressure nitrogen gas is introduced to blow out the catalyst particles collected by the filter residue collector 8 through the residue discharge pipeline.

[0039] The above-mentioned content should be understood as the embodiments only for more clearly illustrating the application, and should not be used to limit the scope of the application, after reading the application, the various equivalent modifications of the application made by the person skilled in the art all fall within the scope defined by the claims attached to the application.

Claims

1. A filtering purification system, comprising a raw material tank (1), a feeding pump (4), a filter (3), a heater (2), a cleaning pump (6), a cleaning liquid circulating tank (7) and a filter residue collector (8); the filter (3) is provided with an upper shell (31), a lower shell (32) and a filter core (5), the filter core (5) is arranged in the lower shell (32), the lower shell (32) is connected with the raw material tank (1) through a pipeline, the feeding pump (4) is arranged on the pipeline between the lower shell (32) and the raw material tank (1), the upper shell (31) is connected with a backwashing air inlet pipeline, the raw material tank (1) and the filter (3) are both provided with the heater (2) outside; the lower shell (32) of the filter is connected with an inflow port of the filter residue collector (8) through a pipeline, the upper shell (31) is connected with an outflow port of the filter residue collector (8) through a pipeline, the cleaning pump (6) and the cleaning liquid circulating tank (7) are arranged on the pipeline between the upper shell (31) and the filter residue collector (8) in sequence; the heater (2) is used for heating the filtered liquid to reduce the viscosity of the filtered liquid, effectively preventing the pipeline and the device from being blocked, and the heater (2) can also heat the cleaning liquid during backwashing; the upper shell (31) of the filter is connected with a cleaning liquid inflow pipeline, which is used for flushing the filter core (5) from top to bottom and from inside to outside, the cleaning liquid inflow pipeline is connected with a cleaning liquid feeding valve (15) and the cleaning pump (6); the upper shell (31) of the filter is also connected with a backwashing air inlet pipeline, the backwashing air inlet pipeline is provided with a backwashing air inlet valve (12) and a flow meter (13).

2. The filtration and purification system of claim 1, wherein A tube sheet is arranged between the upper shell (31) and the lower shell (32) of the filter, the tube sheet is provided with a connecting port, and pressure gauges are arranged on the shells on both sides of the tube sheet; the filter core (5) is closed at the bottom end and provided with a connecting head matched with the connecting port at the top end, the connecting head is in sealed connection with the tube sheet, and the connecting head is used for connecting the two sides of the tube sheet.

3. The filtration and purification system of claim 1, wherein The lower shell (32) of the filter is connected with a feeding pipeline, the feeding pipeline is provided with the feeding pump (4) and a feeding valve (9), the upper shell (31) of the filter is connected with a filtered liquid outflow pipeline, the filtered liquid outflow pipeline is provided with a discharge valve (10), and the upper shell (31) of the filter is connected with an exhaust pipeline, the exhaust pipeline is provided with a vent valve (11).

4. The filtration and purification system of claim 1, wherein The lower shell (32) of the filter is connected with the inflow port of the filter residue collector (8) through a connecting pipeline, the connecting pipeline is provided with a cleaning liquid discharge valve (14), and the filter residue collector (8) is respectively connected with a purging pipeline and a residue discharge pipeline, the purging pipeline is provided with a backblowing valve (16), and the residue discharge pipeline is provided with a residue discharge valve (17).

5. The use of a filtration purification system according to any one of claims 1-4, characterized in that The filtering purification system comprises the following steps: Filtering operation: first, the heater (2) is turned on to heat the raw material tank (1) and the filter (3), when the temperature reaches a set temperature, the feeding pump (4), the feeding valve (9) and the discharge valve (10) are turned on, raw materials enter the lower shell (32) of the filter, pass through the filter core (5) from outside to inside, and filter residues are intercepted on the outer surface of the filter core (5) to form filter cakes; the filtered liquid is discharged through the outflow pipeline; during the filtering, the thickness of the filter cakes increases with the filtering time; Backwash operation: when the pressure difference between the two pressure gauges on the filter (3) reaches the set value, the feed pump (4), the feed valve (9) and the discharge valve (10) are closed, the cleaning liquid feed valve (15), the cleaning liquid discharge valve (14) and the cleaning pump (6) are opened, the cleaning liquid flows from the upper housing (31) through the filter element (5) into the lower housing (32), continuously flushing the surface of the filter element (5), while the backwash air inlet valve (12) is opened, high-pressure gas is intermittently introduced into the permeation side of the filter (3), forming a bubble flow, which not only has a backwashing effect under high pressure, but also forms a gas flow brush with the circulating liquid to flush the filter element; all the filter residue washed out by backwashing is collected by the filter residue collector (8); Residue collection operation: open the backflush valve (16) and the residue discharge valve (17), close other valves, and introduce high-pressure gas to blow out the filter residue collected by the filter residue collector (8) through the residue discharge pipeline.

6. The method of using a filtration purification system of claim 5, wherein During the filtration operation, the heating temperature of the raw material tank (1) and the filter (3) is controlled at 160-240℃; and / or, When the pressure difference between the two sides of the tube sheet in the filter (3) reaches the set value of 100-200kPa, backwashing operation is performed; and / or, The backwashing gas medium is nitrogen, the inlet gas flow rate is set at 10-1000L / min, and the intermittent inlet gas time interval is 1-30s; And / or, The backflush gas medium is nitrogen, and the inlet gas flow rate is set at 10-1000L / min; and / or, The cleaning liquid is a low-hydrocarbon compound, including diesel oil, gasoline and petroleum ether.

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