Multifunctional filtering system for coal tar

Abstract

The utility model provides a multifunctional filtering system for coal tar, which comprises a raw material liquid inlet, a soak solution inlet, a filter, a clear liquid outlet, a collecting tank, a gas buffer tank and a control subsystem, and is characterized in that the filter is connected with the raw material liquid inlet and the clear liquid outlet; the soaking liquid inlet is connected with the filter; the filter is connected with the gas buffer tank and the collecting tank; the collecting tank is used for collecting a sewage solution carrying sediments and a soaking sewage solution which are formed after the filter is subjected to backwashing; and the control subsystem can control the operation of the filtering system. The series connection mode of the filtering system realizes multi-stage filtering, and the two filters are connected in series for use, so that the filtering precision of the filtering system is greatly improved. According to the parallel connection mode of the filtering system, one filter is standby and the other filter is used, when one filter is used for backwashing, the other filter is automatically switched to work, the filtering system continuously filters, and the filtering efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid-solid filtering systems, in particular to a multifunctional filtering system for coal tar. Background Art

[0002] Coal tar is a liquid product obtained through the dry distillation and gasification of coal during coking. At room temperature, coal tar is a dark brown, viscous liquid containing impurities such as water, metals, and asphaltenes. Traditionally, coal tar catalytic hydrogenation to produce high-quality fuel oil involves cutting the fraction by concentrating impurity-containing components within the heavier fractions through atmospheric and vacuum decompression. However, this processing method results in reduced oil yield and poor economic efficiency. Therefore, the core of coal tar hydrogenation is to remove impurities that affect hydrogenation, allowing the entire fraction to enter the reactor for the hydrogenation reaction.

[0003] In existing technologies, filtration systems typically use multiple filters connected in series or in parallel to filter coal tar. In systems with multiple filters connected in series, when the filters need to be backflushed, the filtration of the coal tar must be stopped, reducing efficiency. In systems with multiple filters connected in parallel, the required filtration accuracy is sometimes not achieved.

[0004] Therefore, there is a need for a multifunctional filtration system for coal tar. Utility Model Content

[0005] The purpose of the utility model is to provide a multifunctional coal tar filtration system, which has a simple process flow, convenient operation, excellent purification effect, high efficiency and continuous operation, high coal tar oil recovery rate, and good filter element regeneration effect.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A multifunctional filtration system for coal tar, comprising a raw liquid inlet, a soaking liquid inlet, a filter, a clear liquid outlet, a collecting tank, a gas buffer tank and a control subsystem, wherein the filter is connected to both the raw liquid inlet and the clear liquid outlet, the filter can filter the raw liquid provided by the raw liquid inlet, the raw liquid forms sediment and clear liquid after being filtered by the filter, and the clear liquid flows out through the clear liquid outlet; the soaking liquid inlet is connected to the filter, the soaking liquid enters the filter through the soaking liquid inlet, and the soaking liquid can dissolve the colloid in the sediment in the filter after entering the filter; the filter is connected to both the gas buffer tank and the collecting tank, the backwash gas provided by the gas buffer tank can pressurize the filter, and assist in backwashing the sediment formed in the filter; the collecting tank is used to collect the dirty liquid with sediment and the soaking dirty liquid formed after the filter is backwashed; the control subsystem can control the operation of the filtration system.

[0008] Furthermore, in the above-mentioned multifunctional filtration system for coal tar, a tube sheet is provided in the filter, and the tube sheet divides the space in the filter into an upper cavity and a lower cavity, and a filter element is provided in the lower cavity, and the upper end of the filter element is connected to the tube sheet; a differential pressure gauge is provided on the outer wall of the filter, and the two ends of the differential pressure gauge are respectively connected to the upper cavity and the lower cavity, and the differential pressure gauge is used to measure the pressure difference between the upper cavity and the lower cavity; a liquid inlet is provided on the side wall of the lower cavity, and the liquid inlet is located at the lower part of the lower cavity, and a liquid outlet is provided on the side wall of the upper cavity, a back-blowing air inlet is provided at the upper end of the filter, and a sewage outlet is provided at the lower end of the filter; two filters are provided, and the two filters are the first filter and the second filter; the differential pressure gauge is connected to the control subsystem.

[0009] Furthermore, in the above-mentioned multifunctional filtration system for coal tar, a partition is provided in the collection tank, which divides the space in the collection tank into a soaking liquid chamber and a dirty liquid chamber. The soaking liquid chamber is used to collect soaking dirty liquid, and the dirty liquid chamber is used to collect dirty liquid with sediment.

[0010] Furthermore, in the above-mentioned multifunctional filtration system for coal tar, a first liquid supply pipe is connected to the raw liquid inlet, the first liquid supply pipe is connected to the liquid inlet of the first filter through a first branch pipe, and the first liquid supply pipe is connected to the liquid inlet of the second filter through a second branch pipe; a liquid outlet pipe is connected to the clear liquid outlet, the liquid outlet pipe is connected to the liquid outlet of the first filter through a third branch pipe, and the liquid outlet pipe is connected to the liquid outlet of the second filter through a fourth branch pipe; a raw liquid feed valve and a feed pump are provided on the first liquid supply pipe, and the raw liquid feed valve is close to the raw liquid inlet relative to the feed pump, a first control valve is provided on the first branch pipe, a second control valve is provided on the second branch pipe, a third control valve is provided on the third branch pipe, a fourth control valve is provided on the fourth branch pipe, and a filtered liquid discharge valve is provided on the liquid outlet pipe; the raw liquid feed valve, the first control valve, the second control valve, the third control valve, the fourth control valve and the filtered liquid discharge valve are all connected to the control subsystem.

[0011] Furthermore, in the above-mentioned multifunctional filtration system of coal tar, one end of a second liquid supply pipe is connected to the soaking liquid inlet, the other end of the second liquid supply pipe is connected to the first liquid supply pipe between the raw liquid feed valve and the feed pump, and a soaking liquid feed valve is provided on the second liquid supply pipe; the soaking liquid feed valve is connected to the control subsystem.

[0012] Furthermore, in the above-mentioned multifunctional filtration system for coal tar, an air intake pipe is connected to the gas buffer tank, the air intake pipe is connected to the back-blowing air inlet of the first filter through a fifth branch pipe, and the air intake pipe is connected to the back-blowing air inlet of the second filter through a sixth branch pipe; the sewage outlet of the first filter and the sewage outlet of the second filter are connected through a sewage pipe; a first back-blowing air intake valve is provided on the fifth branch pipe, a second back-blowing air intake valve is provided on the sixth branch pipe, a fifth control valve is provided on the sewage pipe near the second filter, and a fifth control valve is provided on the sewage pipe near the first filter. A sixth control valve is provided on the sewage pipe; the sewage pipe between the fifth control valve and the sixth control valve and the soaking liquid chamber of the collecting tank are connected via a soaking liquid inlet pipe, and the sewage pipe between the fifth control valve and the sixth control valve and the dirty liquid chamber of the collecting tank are connected via a dirty liquid inlet pipe; a soaking liquid discharge valve is provided on the soaking liquid inlet pipe, and a dirty liquid discharge valve is provided on the dirty liquid inlet pipe, and the first back-blowing air inlet valve, the second back-blowing air inlet valve, the fifth control valve, the sixth control valve, the soaking liquid discharge valve and the dirty liquid discharge valve are all connected to the control subsystem.

[0013] Furthermore, the above-mentioned multifunctional filtration system for coal tar also includes a seventh branch pipe, one end of which is connected to the liquid outlet of the first filter, and the other end of the seventh branch pipe is connected to the second branch pipe between the second control valve and the liquid inlet of the second filter; a seventh control valve is provided on the seventh branch pipe, and an eighth control valve is provided on the second branch pipe near the liquid inlet of the second filter; the seventh control valve and the eighth control valve are connected to the control subsystem.

[0014] Furthermore, the above-mentioned multifunctional filtration system for coal tar also includes a soaking liquid circulation pipe, one end of which is connected to the liquid outlet pipe, and the other end of which is connected to the first liquid supply pipe; a ninth control valve is provided on the soaking liquid circulation pipe, and the ninth control valve is connected to the control subsystem.

[0015] Furthermore, in the above-mentioned multifunctional filtration system for coal tar, the control subsystem is a PLC control system or a DCS control system.

[0016] Furthermore, in the above-mentioned multifunctional filtration system for coal tar, the control subsystem controls the valves of the filtration system so that the two filters can operate in parallel or in series; when the two filters are connected in parallel, one filter is used to filter the raw liquid, and the other filter is used for backwashing and then kept in reserve; when the two filters are connected in series, the second filter is located downstream of the first filter, and the filtration accuracy of the second filter is greater than that of the first filter.

[0017] Analysis shows that the utility model discloses a multifunctional filtration system for coal tar. The series mode of the filtration system realizes multi-stage filtration. The two filters are used in series, which greatly improves the filtration accuracy of the filtration system and can meet the high-precision filtration requirements. The parallel mode of the filtration system realizes one backup filter and one use filter. When one filter is backwashed, the other filter is automatically switched to work. The filtration system filters continuously, which improves the filtration efficiency of the system. The collection tank can collect the dirty oil generated during the filtration process in time, reducing environmental pollution. The collection tank is divided into an immersion liquid chamber and a dirty liquid chamber by a partition, which reduces the number of equipment and reduces the one-time investment cost of the equipment. The filter element is cleaned by the dual method of online backwashing and immersion, which improves the regeneration effect of the filter element and extends the continuous online life of the filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of this application are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention.

[0019] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic structural diagram of a filter according to an embodiment of the present invention.

[0021] Explanation of reference numerals: 1 raw liquid inlet; 2 soaking liquid inlet; 3 clear liquid outlet; 4 collecting tank; 5 gas buffer tank; 6 tube sheet; 7 upper cavity; 8 lower cavity; 9 filter element; 10 differential pressure gauge; 11 liquid inlet; 12 liquid outlet; 13 back-blowing gas inlet; 14 sewage outlet; 15 first filter; 16 second filter; 17 partition; 18 soaking liquid chamber; 19 sewage chamber; 20 first liquid supply pipe; 21 first branch pipe; 22 second branch pipe; 23 liquid outlet pipe; 24 third branch pipe; 25 fourth branch pipe; 26 second liquid supply pipe; 27 air inlet pipe; 28 fifth branch pipe ; 29 sixth branch pipe; 30 sewage pipe; 31 seventh branch pipe; 32 soaking liquid circulation pipe; 33 feed pump; 34 raw liquid feed valve; 35 first control valve; 36 second control valve; 37 third control valve; 38 fourth control valve; 39 filtered liquid discharge valve; 40 soaking liquid feed valve; 41 first back-blowing air inlet valve; 42 second back-blowing air inlet valve; 43 fifth control valve; 44 sixth control valve; 45 soaking liquid discharge valve; 46 sewage discharge valve; 47 seventh control valve; 48 eighth control valve; 49 ninth control valve; 50 soaking liquid inlet pipe; 51 sewage inlet pipe. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with examples. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompass such modifications and variations as come within the scope of the appended claims and their equivalents.

[0023] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and the description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first," "second," and "third," etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.

[0025] like Figures 1 to 2 As shown, according to an embodiment of the present invention, a multifunctional filtration system for coal tar is provided, such as Figure 1 As shown, it includes a raw liquid inlet 1, a soaking liquid inlet 2, a filter, a clear liquid outlet 3, a collecting tank 4, a gas buffer tank 5 and a control subsystem, wherein the filter is connected to both the raw liquid inlet 1 and the clear liquid outlet 3, and the filter can filter the raw liquid provided by the raw liquid inlet 1. The raw liquid of coal tar is filtered by the filter to form a precipitate (filter cake) and a clear liquid. The precipitate adheres to the surface of the filter, and the clear liquid flows out through the clear liquid outlet 3; the soaking liquid inlet 2 is connected to the filter, and the soaking liquid enters the filter through the soaking liquid inlet 2. After entering the filter, the soaking liquid can dissolve the colloid in the precipitate in the filter; the filter is connected to the gas buffer tank 5 and the collecting tank 4, and the backwash gas provided by the gas buffer tank 5 can pressurize the filter to assist in backwashing the precipitate formed in the filter; the collecting tank 4 is used to collect the dirty liquid with precipitate and the soaking dirty liquid formed after the filter is backwashed; the control subsystem can control the operation of the filtration system.

[0026] Further, if Figure 2As shown, the filter is provided with a tube sheet 6, which divides the space within the filter into an upper chamber 7 and a lower chamber 8. A filter element 9 is provided in the lower chamber 8, and the upper end of the filter element 9 is connected to the tube sheet 6. A differential pressure gauge 10 is provided on the outer wall of the filter, and its two ends are connected to the upper chamber 7 and the lower chamber 8 respectively. The differential pressure gauge 10 is used to measure the pressure difference between the upper chamber 7 and the lower chamber 8. A liquid inlet 11 is provided on the side wall of the lower chamber 8, and the liquid inlet 11 is located at the bottom of the lower chamber 8. A liquid outlet 12 is provided on the side wall of the upper chamber 7. A backwash air inlet 13 is provided at the upper end of the filter, and a sewage outlet 14 is provided at the lower end of the filter. The differential pressure gauge 10 is connected to the control subsystem. When the pressure difference between the upper chamber 7 and the lower chamber 8 reaches a set value, the control subsystem controls the corresponding valves to backwash and drain the filter. There are two filters, a first filter 15 and a second filter 16.

[0027] Furthermore, a partition 17 is provided in the collecting tank 4, which divides the space in the collecting tank 4 into an immersion liquid chamber 18 and a sewage liquid chamber 19. The immersion liquid chamber 18 is used to collect the immersion sewage, and the sewage chamber 19 is used to collect the sewage with sediment. The partition 17 is used to divide the collecting tank 4 into the immersion liquid chamber 18 and the sewage chamber 19, which reduces the number of equipment and reduces the one-time investment cost of the equipment.

[0028] Furthermore, a first liquid supply pipe 20 is connected to the raw liquid inlet 1, and the first liquid supply pipe 20 is connected to the liquid inlet 11 of the first filter 15 through a first branch pipe 21, and the first liquid supply pipe 20 is connected to the liquid inlet 11 of the second filter 16 through a second branch pipe 22; a liquid outlet pipe 23 is connected to the clear liquid outlet 3, and the liquid outlet pipe 23 is connected to the liquid outlet 12 of the first filter 15 through a third branch pipe 24, and the liquid outlet pipe 23 is connected to the liquid outlet 12 of the second filter 16 through a fourth branch pipe 25. A raw liquid feed valve 34 and a feed pump 33 are provided on the first liquid supply pipe 20. Relative to the feed pump 33, the raw liquid feed valve 34 is close to the raw liquid inlet 1, the first branch pipe 21 is provided with a first control valve 35, the second branch pipe 22 is provided with a second control valve 36, the third branch pipe 24 is provided with a third control valve 37, the fourth branch pipe 25 is provided with a fourth control valve 38, and the liquid outlet pipe 23 is provided with a filtered liquid discharge valve 39; the raw liquid feed valve 34, the first control valve 35, the second control valve 36, the third control valve 37, the fourth control valve 38 and the filtered liquid discharge valve 39 are all connected to the control subsystem.

[0029] Furthermore, one end of a second liquid supply pipe 26 is connected to the soaking liquid inlet 2, and the other end of the second liquid supply pipe 26 is connected to the first liquid supply pipe 20 between the raw liquid feed valve 34 and the feed pump 33. A soaking liquid feed valve 40 is provided on the second liquid supply pipe 26; the soaking liquid feed valve 40 is connected to the control subsystem.

[0030] Furthermore, an air inlet pipe 27 is connected to the gas buffer tank 5, and the air inlet pipe 27 is connected to the back-blowing air inlet 13 of the first filter 15 through a fifth branch pipe 28, and the air inlet pipe 27 is connected to the back-blowing air inlet 13 of the second filter 16 through a sixth branch pipe 29; the sewage outlet 14 of the first filter 15 and the sewage outlet 14 of the second filter 16 are connected through a sewage pipe 30; a first back-blowing air inlet valve 41 is provided on the fifth branch pipe 28, a second back-blowing air inlet valve 42 is provided on the sixth branch pipe 29, a fifth control valve 43 is provided on the sewage pipe 30 near the first filter 15, and a A sixth control valve 44 is provided; the drain pipe 30 between the fifth control valve 43 and the sixth control valve 44 and the soaking liquid chamber 18 of the collecting tank 4 are connected via a soaking liquid inlet pipe 50, and the drain pipe 30 between the fifth control valve 43 and the sixth control valve 44 and the dirty liquid chamber 19 of the collecting tank 4 are connected via a dirty liquid inlet pipe 51; a soaking liquid discharge valve 45 is provided on the soaking liquid inlet pipe 50, and a dirty liquid discharge valve 46 is provided on the dirty liquid inlet pipe 51; the first back-blowing air inlet valve 41, the second back-blowing air inlet valve 42, the fifth control valve 43, the sixth control valve 44, the soaking liquid discharge valve 45 and the dirty liquid discharge valve 46 are all connected to the control subsystem.

[0031] Furthermore, the filtration system also includes a seventh branch pipe 31, one end of the seventh branch pipe 31 is connected to the liquid outlet 12 of the first filter 15, and the other end of the seventh branch pipe 31 is connected to the second branch pipe 22 between the second control valve 36 and the liquid inlet 11 of the second filter 16; a seventh control valve 47 is provided on the seventh branch pipe 31, and an eighth control valve 48 is provided on the second branch pipe 22 near the liquid inlet 11 of the second filter 16; the seventh control valve 47 and the eighth control valve 48 are both connected to the control subsystem.

[0032] Furthermore, the filtration system also includes a soaking liquid circulation pipe 32, one end of the soaking liquid circulation pipe 32 is connected to the liquid outlet pipe 23, and the other end of the soaking liquid circulation pipe 32 is connected to the first liquid supply pipe 20; a ninth control valve 49 is provided on the soaking liquid circulation pipe 32, and the ninth control valve 49 is connected to the control subsystem.

[0033] Furthermore, the control subsystem is a PLC (Programmable Logic Controller) control system or a DCS (Data Communication Subsystem) control system.

[0034] Furthermore, the control subsystem controls the valves of the filtration system to enable the two filters to operate in parallel or in series; when the two filters are connected in parallel, one filter is used to filter the raw liquid, and the other filter is used as a standby after backwashing; when the two filters are connected in series, the second filter 16 is located downstream of the first filter 15, and the filtration accuracy of the second filter 16 is greater than the filtration accuracy of the first filter 15.

[0035] The filtration system includes three stages: filtration, backwashing and soaking. The working principle of the filtration system is:

[0036] When used in parallel:

[0037] Filtration process: Open the raw liquid feed valve 34, the first control valve 35, the third control valve 37, and the clear liquid discharge valve 39, close the remaining valves, and start the feed pump 33. The raw liquid enters the first filter 15 from the liquid inlet 11 through the first liquid supply pipe 20. After the raw liquid is filtered by the filter element 9, solid impurities are intercepted on the surface of the filter element 9 to form a filter cake. The filtered clear liquid flows out from the liquid outlet 12 of the first filter 15, passes through the third control valve 37 and the clear liquid discharge valve 39, and reaches the clear liquid outlet 3. At this time, the first filter 15 is in the normal filtration process.

[0038] Backwashing process: As first filter 15 filters, the filter cake accumulated on the surface of filter element 9 becomes increasingly thick, and the pressure differential between upper chamber 7 and lower chamber 8 within first filter 15 gradually increases. When the pressure differential reaches a preset value, the control subsystem outputs a signal to close first control valve 35 and third control valve 37, while simultaneously opening second control valve 36, eighth control valve 48, and fourth control valve 38. Then, first backwash air inlet valve 41 is opened, and backwash gas flows from gas buffer tank 5 through inlet pipe 27 into first filter 15. After a period of time, waste liquid discharge valve 46 and fifth control valve 43 are opened, and the clear liquid within first filter 15, aided by the backwash gas, forms a forced flow, removing the filter cake from the surface of filter element 9. The waste liquid, carrying the filter cake, is discharged from drain port 14 of first filter 15 through drain pipe 30 into waste liquid chamber 19 of collection tank 4. At this point, the raw liquid flows from the first liquid supply pipe 20 through the raw liquid feed valve 34, the second control valve 36, and the eighth control valve 48, entering the second filter 16 from the liquid inlet 11. After being filtered by the filter element 9, the clear liquid flows out of the liquid outlet 12 of the second filter 16, passes through the fourth control valve 38 and the clear liquid discharge valve 39, and reaches the clear liquid outlet 3. This enables the switching between the first filter 15 and the second filter 16, achieving continuous online filtration. The backwashing process for the second filter 16 is the same as that for the first filter 15.

[0039] Soaking process: When the first filter 15 is backwashed and the initial pressure difference value of the re-feed fails to drop to the set value, the soaking program needs to be started. Open the soaking liquid feed valve 40 and the first control valve 35, and close the other valves. The soaking liquid enters the first filter 15 from the liquid inlet 11 of the first filter 15 through the second liquid supply pipe 26. After the soaking liquid fills the first filter 15 for a period of time, it can dissolve the colloidal substances that block the filter element 9. Open the first back-blowing gas inlet valve 41, and the back-blowing gas enters the first filter 15 from the gas buffer tank 5 through the air inlet pipe 27. After a period of time, open the soaking liquid discharge valve 45 and the fifth control valve 43, and the soaking liquid is discharged from the sewage outlet 14 of the first filter 15 through the sewage pipe 30 into the soaking liquid chamber 18 of the collection tank 4. When the soaking effect is not ideal, the soaking liquid circulates in the first filter 15 under the action of the feed pump 33 to increase the soaking effect of the soaking liquid. At this point, the soaking liquid feed valve 40, first control valve 35, third control valve 37, and ninth control valve 49 are opened, and the remaining valves are closed. The soaking liquid enters the first filter 15 through the second liquid supply pipe 26 at its liquid inlet 11, flows out through the first filter 15's liquid outlet 12, and returns to the second liquid supply pipe 26 through the soaking liquid circulation pipe 32, completing the soaking liquid circulation process. After a period of time, the fifth control valve 43 and soaking liquid discharge valve 45 are opened to collect the resulting soaking liquid into the soaking liquid chamber 18 of the collection tank 4. The soaking process for the second filter 16 is similar to that for the first filter 15.

[0040] When used in series:

[0041] When the raw material liquid contains a high amount of solid impurities and the span of the solid particles is large, the first filter 15 and the second filter 16 are installed with filter elements 9 of different precisions, and the precision of the filter element 9 of the second filter 16 is greater than the precision of the filter element 9 of the first filter 15. In this case, the first filter 15 and the second filter 16 are used in series, which can significantly improve the filtration precision.

[0042] Open the raw liquid feed valve 34, first control valve 35, seventh control valve 47, eighth control valve 48, fourth control valve 38, and clear liquid discharge valve 39. Close all other valves and start the feed pump 33. The raw liquid enters the first filter 15 through the first liquid supply pipe 20 at its liquid inlet 11. After primary filtration by the first filter 15, the clear liquid flows out of the first filter 15's liquid outlet 12. After passing through the seventh control valve 47 and eighth control valve 48, the clear liquid enters the second filter 16 from the liquid inlet 11. After secondary filtration by the second filter 16, the clear liquid flows out of the second filter 16's liquid outlet 12 to the clear liquid outlet 3. This filtration method effectively reduces the solids content of the clear liquid after filtration and is suitable for applications requiring high filtration precision.

[0043] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0044] 1. The series mode realizes multi-stage filtration. The two filters are used in series, which greatly improves the filtration accuracy of the filtration system and can meet the high-precision filtration needs.

[0045] 2. The parallel mode realizes one backup filter and one standby filter. When one filter is backwashing, the other filter is automatically switched to work. The filtration system continuously filters, thereby improving the filtration efficiency of the system.

[0046] 3. The collecting tank 4 can collect the dirty oil generated during the filtration process in time, reducing environmental pollution. The collecting tank 4 is divided into an immersion liquid chamber 18 and a dirty liquid chamber 19 by a partition 17, which reduces the number of equipment and reduces the one-time investment cost of the equipment.

[0047] 4. The filter element 9 is cleaned by a dual method of online backwashing and soaking, which improves the regeneration effect of the filter element 9 and extends the continuous online life of the filter device.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multifunctional filtration system for coal tar, characterized in that: It includes raw liquid inlet, soaking liquid inlet, filter, clear liquid outlet, collection tank, gas buffer tank and control subsystem, among which, The filter is connected to both the raw liquid inlet and the clear liquid outlet, and the filter is capable of filtering the raw liquid provided by the raw liquid inlet. After the raw liquid is filtered by the filter, a precipitate and a clear liquid are formed, and the clear liquid flows out through the clear liquid outlet; The soaking liquid inlet is connected to the filter, and the soaking liquid enters the filter through the soaking liquid inlet. After entering the filter, the soaking liquid can dissolve the colloid in the sediment in the filter; The filter is connected to both the gas buffer tank and the collection tank, and the backwash gas provided by the gas buffer tank can pressurize the filter to assist in backwashing the sediment formed in the filter; The collecting tank is used to collect the dirty liquid with sediment and the soaking dirty liquid formed after the filter is backwashed; The control subsystem is capable of controlling the operation of the filtration system.

2. The multifunctional filtration system for coal tar according to claim 1, characterized in that: The filter is provided with a tube sheet, which divides the space in the filter into an upper cavity and a lower cavity. A filter element is provided in the lower cavity, and the upper end of the filter element is connected to the tube sheet. A differential pressure gauge is provided on the outer wall of the filter, and both ends of the differential pressure gauge are connected to the upper cavity and the lower cavity respectively, and the differential pressure gauge is used to measure the pressure difference between the upper cavity and the lower cavity; A liquid inlet is provided on the side wall of the lower cavity, the liquid inlet is located at the lower part of the lower cavity, a liquid outlet is provided on the side wall of the upper cavity, a back-blowing air inlet is provided at the upper end of the filter, and a sewage outlet is provided at the lower end of the filter; There are two filters, which are a first filter and a second filter respectively; The differential pressure gauge is connected to the control subsystem.

3. The multifunctional filtration system for coal tar according to claim 2, characterized in that: A partition is provided in the collection tank, and the partition divides the space in the collection tank into a soaking liquid chamber and a dirty liquid chamber. The soaking liquid chamber is used to collect the soaking dirty liquid, and the dirty liquid chamber is used to collect the dirty liquid with sediment.

4. The multifunctional filtration system for coal tar according to claim 2, characterized in that: A first liquid supply pipe is connected to the raw liquid inlet, the first liquid supply pipe is connected to the liquid inlet of the first filter through a first branch pipe, and the first liquid supply pipe is connected to the liquid inlet of the second filter through a second branch pipe; A liquid outlet pipe is connected to the clear liquid outlet, the liquid outlet pipe is connected to the liquid outlet of the first filter through a third branch pipe, and the liquid outlet pipe is connected to the liquid outlet of the second filter through a fourth branch pipe; The first liquid supply pipe is provided with a raw liquid feed valve and a feed pump. Relative to the feed pump, the raw liquid feed valve is close to the raw liquid inlet. The first branch pipe is provided with a first control valve, the second branch pipe is provided with a second control valve, the third branch pipe is provided with a third control valve, the fourth branch pipe is provided with a fourth control valve, and the liquid outlet pipe is provided with a filtered liquid discharge valve; The raw liquid feed valve, the first control valve, the second control valve, the third control valve, the fourth control valve and the filtered liquid discharge valve are all connected to the control subsystem.

5. The multifunctional filtration system for coal tar according to claim 4, characterized in that: One end of a second liquid supply pipe is connected to the soaking liquid inlet, the other end of the second liquid supply pipe is connected to the first liquid supply pipe between the raw liquid feed valve and the feed pump, and the soaking liquid feed valve is provided on the second liquid supply pipe; The soaking liquid feed valve is connected to the control subsystem.

6. The multifunctional filtration system for coal tar according to claim 3, characterized in that: An air inlet pipe is connected to the gas buffer tank, the air inlet pipe is connected to the back-blowing air inlet of the first filter through a fifth branch pipe, and the air inlet pipe is connected to the back-blowing air inlet of the second filter through a sixth branch pipe; The sewage outlet of the first filter and the sewage outlet of the second filter are connected through a sewage pipe; A first back-blowing air inlet valve is provided on the fifth branch pipe, a second back-blowing air inlet valve is provided on the sixth branch pipe, a fifth control valve is provided on the drain pipe near the second filter, and a sixth control valve is provided on the drain pipe near the first filter; The drain pipe between the fifth control valve and the sixth control valve is connected to the soaking liquid chamber of the collection tank via a soaking liquid inlet pipe, and the drain pipe between the fifth control valve and the sixth control valve is connected to the dirty liquid chamber of the collection tank via a dirty liquid inlet pipe; The soaking liquid inlet pipe is provided with a soaking liquid discharge valve, the dirty liquid inlet pipe is provided with a dirty liquid discharge valve, the first back-blowing air inlet valve, the second back-blowing air inlet valve, the fifth control valve, the sixth control valve, the soaking liquid discharge valve and the dirty liquid discharge valve are all connected to the control subsystem.

7. The multifunctional filtration system for coal tar according to claim 4, characterized in that: The system further comprises a seventh branch pipe, one end of the seventh branch pipe being connected to the liquid outlet of the first filter, and the other end of the seventh branch pipe being connected to the second branch pipe between the second control valve and the liquid inlet of the second filter; The seventh branch pipe is provided with a seventh control valve, and the second branch pipe close to the liquid inlet of the second filter is provided with an eighth control valve; The seventh control valve and the eighth control valve are connected to the control subsystem.

8. The multifunctional filtration system for coal tar according to claim 4, characterized in that: It also includes a soaking liquid circulation pipe, one end of which is connected to the liquid outlet pipe, and the other end of which is connected to the first liquid supply pipe; A ninth control valve is provided on the soaking liquid circulation pipe, and the ninth control valve is connected to the control subsystem.

9. The multifunctional filtration system for coal tar according to claim 1, characterized in that: The control subsystem is a PLC control system or a DCS control system.

10. The multifunctional filtration system for coal tar according to claim 2, characterized in that: The control subsystem controls the valves of the filter system so that the two filters can operate in parallel or in series; When two filters are connected in parallel, one filter is used to filter the raw liquid, and the other filter is used for backwashing and then kept in standby mode. When the two filters are connected in series, the second filter is located downstream of the first filter, and the filtering accuracy of the second filter is greater than that of the first filter.

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