System and method for preventing thick matter filter from being blocked during tar residue separation

Abstract

The invention relates to a system and method for preventing a thick matter filter from being blocked during tar residue separation, the system comprises the thick matter filter arranged between a tar residue pre-separator and a tar squeezing pump, and further comprises an inlet flushing pipeline, an outlet flushing pipeline, a bottom back flushing pipeline, a first pressure sensor, a second pressure sensor and a control system; a hot ammonia water outlet of the inlet flushing pipeline is connected with an inlet tar pipeline, a hot ammonia water outlet of the outlet flushing pipeline is connected with an outlet tar pipeline, a first pressure sensor is arranged on the inlet tar pipeline, and a second pressure sensor is arranged on the outlet tar pipeline; and a hot ammonia water outlet of the bottom backwashing pipeline is connected with an emptying pipeline. By adopting various measures, the thick matter filter is effectively prevented from being blocked, and the device has the advantages of being easy to operate, high in automation degree, high in working reliability and the like, and has wide application prospects and market requirements.

Description

Technical Field

[0001] The invention relates to the field of coking technology, and in particular to a system and method for preventing a thick material filter from being blocked when separating tar residue from a tar-ammonia water mixture during a raw gas condensation cooling process. Background Art

[0002] During the coking process of coke oven, a large amount of high-temperature raw gas will be produced. Under the cooling effect of circulating ammonia water in the gas collecting pipe, these raw gas will condense some high-boiling point organic compounds to form tar semi-solid. At the same time, coal powder, semi-coke, etc. entrained in the raw gas will also be mixed in the tar to form a tar-ammonia mixture. This tar-ammonia mixture enters the gas-liquid separator together with the raw gas for gas-liquid separation. The separated tar-ammonia mixture enters the tar residue pre-separator, and the tar residue is separated from the tar-ammonia mixture by gravity. A grate screen is usually provided at the outlet of the tar residue pre-separator to intercept solids larger than 8mm in the tar residue pre-separator, and settle to the bottom of the tar residue pre-separator and be pumped out by the tar squeeze pump. The solids are crushed by the tar squeeze pump and sent back to the upper part of the tar residue pre-separator. When the tar residue pre-separator or tar pressing pump is under maintenance, the tar in the pre-separator or tar pressing pump can be discharged into the drain tank through the thick material filter. The thick material filter is used to prevent tar residue larger than 8mm from entering the drain tank and causing equipment blockage.

[0003] The Chinese utility model patent with application number 201020133530.0 discloses a "tar thick material filter", which is connected between the tar residue pre-separator and the tar pressing pump, including a body, an inlet and outlet, and a venting port. A filter screen is arranged in the body, the filter screen is arranged horizontally and is on the same horizontal plane as the inlet and outlet of the body, and the filter screen is fixed to the inner wall of the body by welding. Its working principle is: the tar residue coming out of the tar residue pre-separator enters the body of the thick material filter through the inlet, wherein the tar residue less than 8mm settles to the bottom of the body cone and is discharged into the venting tank through the venting pipe, while the tar residue greater than 8mm is blocked by the filter screen and can be continuously transported from the outlet to the tar pressing pump by the tar pressing pump, and will not be deposited in the filter to cause blockage. Finally, the tar residue is crushed in the tar pressing pump and sent back to the tar residue pre-separator for circulation treatment.

[0004] There are some problems with the above-mentioned tar residue separation method: First, the flushing operation of the thick filter and the tar pressing pump is mainly achieved by manually controlling the valve, which not only increases the labor intensity of the operators, but also increases the operating costs of the enterprise; secondly, if the thick filter is blocked and cannot be found and cleaned in time, it is easy to cause damage to the thick filter and affect the normal operation of production; finally, in winter, due to the low temperature, tar is easy to solidify, which makes it easier to cause the thick filter to be blocked, and it needs to be cleaned frequently by humans, affecting production efficiency. In summary, the current tar residue filtration and separation process has problems such as complex operation, strong dependence on manual labor, and high maintenance cost.

[0005] The Chinese utility model patent with application number 202120311832.0 discloses "a pre-separator tar residue processing system", including a tar residue pre-separator, a coarse crusher, a secondary crushing device, a fine grinding machine, a tar residue centrifuge and a slag box. It solves the problem that the existing process uses an oil residue squeezing pump for squeezing, but the oil residue squeezing pump cannot crush large pieces of tar residue, which is prone to pump blockage and requires production to be stopped for manual cleaning; it can crush and finely grind large pieces of oil residue, and can completely separate the tar residue from the tar. The working process is as follows: the large pieces of tar residue (diameter 1-2cm to more than 10cm) discharged from the slag discharge hole at the bottom of the tar residue pre-separator are crushed to less than 3cm by the coarse crusher, and then enter the secondary crushing device for secondary crushing, crushed to less than 1cm, and heated here to make the temperature of the tar reach 70-75 degrees Celsius, and then enter the fine grinder to grind the tar residue to particles below 2mm, and then enter the tar residue centrifuge for solid-liquid separation, and the dry residue falls into the slag box at the bottom. The separated tar ammonia water is sent to the tar residue pre-separator by a delivery pump; by crushing and fine grinding the large pieces of oil residue, the tar residue in the tar can be completely separated; but it needs to be equipped with a variety of equipment such as coarse crusher, secondary crushing device, fine grinder, tar residue centrifuge, etc., which not only occupies a large area but also increases equipment investment. Summary of the invention

[0006] The present invention provides a system and method for preventing the thick material filter from being blocked during tar residue separation, which adopts multiple measures to effectively prevent the thick material filter from being blocked, has the advantages of simple operation, high degree of automation, strong working reliability, etc., and has broad application prospects and market demand.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A system for preventing a thick material filter from being blocked during tar residue separation comprises a thick material filter arranged between a tar residue pre-separator and a tar pressing pump, wherein the thick material filter is connected to a tar outlet at the bottom of the tar residue pre-separator through an inlet tar pipeline, and is connected to a tar inlet of a tar pressing pump through an outlet tar pipeline, and the outlet of the tar pressing pump is connected to a return tar inlet at the top of the tar residue pre-separator through a return tar pipeline; the solid outlet at the bottom of the thick material filter is connected to a discharge tank through a discharge pipeline; the system for preventing a thick material filter from being blocked during tar residue separation also comprises an inlet flushing pipeline, an outlet flushing pipeline, a bottom backwashing pipeline, a first pressure sensor, a second pressure sensor and a control system; the hot ammonia outlet of the inlet flushing pipeline is connected to the inlet tar pipeline, and a first control system is arranged on the inlet flushing pipeline Valve; the hot ammonia water outlet of the outlet flushing pipeline is connected to the outlet tar pipeline, and a second control valve is arranged on the outlet flushing pipeline; a first pressure sensor is arranged on the inlet tar pipeline downstream of the inlet flushing pipeline, and a second pressure sensor is arranged on the outlet tar pipeline upstream of the outlet tar pipeline; the signal output ends of the first pressure sensor and the second pressure sensor are connected to the signal input end of the control system, and the signal output end of the control system is connected to the control ends of the first control valve and the second control valve; the hot ammonia water outlet of the bottom backwashing pipeline is connected to the venting pipeline, a third control valve is arranged on the bottom backwashing pipeline, a fourth control valve is arranged on the venting pipeline upstream of the bottom backwashing pipeline, and a fifth control valve is arranged on the venting pipeline downstream of the bottom backwashing pipeline; the third control valve, the fourth control valve and the fifth control valve are interlocked and controlled by the control system.

[0009] A steam inlet is arranged on the imported tar pipeline upstream of the imported tar pipeline and is connected to a steam source through a steam pipeline.

[0010] The thick material filter is composed of a filter body, a top cover plate, an inner partition plate and a filter screen; the filter body includes an upper straight section cylinder and a lower conical section cylinder; a tar inlet is arranged on one side of the upper part of the filter body, and a tar outlet is arranged on the other side of the upper part opposite to the tar inlet; an inner partition plate is arranged in the straight section cylinder between the tar inlet and the tar outlet; the top of the filter body is detachably connected to the top cover plate, and the top of the inner partition plate is fixedly connected to the top cover plate; a filter screen is arranged in the filter body below the inner partition plate; the inner partition plate has an initial working position and a normal working position, when the inner partition plate is in the initial working position, it is parallel to the connecting direction of the tar inlet and the tar outlet, and when the inner partition plate is in the normal working position, it is perpendicular to the connecting direction of the tar inlet and the tar outlet.

[0011] A system for preventing a thick material filter from being blocked during tar residue separation, further comprising a pounding device; the pounding device is composed of a bracket, a pounding motor, a stirring paddle and a disturbance mechanism; the thick material filter is composed of a filter body, a top cover plate and a filter screen; the filter body comprises an upper straight section cylinder and a lower conical section cylinder; a tar inlet is arranged on one side of the upper part of the filter body, and a tar outlet is arranged on the other side of the upper part opposite to the tar inlet; the top of the filter body is detachably connected to the top cover plate, and a filter screen is arranged at the bottom of the filter body; the bracket is arranged on the top cover plate, the pounding motor is mounted on the bracket, and the stirring paddle is composed of a stirring shaft and The filter body is composed of stirring blades, the upper end of the stirring shaft is connected to the motor shaft of the pounding motor, and the lower end of the stirring shaft is provided with a plurality of stirring blades; at least two groups of disturbance mechanisms are provided, and each group of disturbance mechanisms includes a disturbance shaft, disturbance blades and a connecting rod; the upper end of the disturbance shaft is hinged to the upper part of the stirring shaft, and the lower end of the disturbance shaft is provided with disturbance blades; a wavy groove is provided on the upper inner wall of the filter body along the circumference, one end of the connecting rod is connected to the disturbance shaft, and the other end of the connecting rod is stuck in the groove; when the stirring shaft rotates driven by the pounding motor, the disturbance shaft rotates accordingly, and under the action of the connecting rod, the disturbance blades are driven to disturb up and down in a wave-like manner along the circumference of the thick material filter.

[0012] A method for preventing a thick material filter from being blocked during separation of tar residues comprises the following steps:

[0013] 1) The coke oven raw gas is cooled by circulating ammonia water in the gas collecting pipe to form a tar-ammonia water mixture containing tar, tar semi-solid, coal powder and semi-coke; the tar-ammonia water mixture and the coke oven raw gas enter the gas-liquid separator for gas-liquid separation; the separated tar-ammonia water mixture enters the tar residue pre-separator, and the solid matter larger than 8mm is retained in the tar residue pre-separator, and the solid matter settles to the bottom of the tar residue pre-separator and enters the thick matter filter through the inlet tar pipeline;

[0014] 2) A first pressure sensor is provided on the inlet tar pipeline, and a second pressure sensor is provided on the outlet tar pipeline. The difference between the measured values ​​of the first pressure sensor and the second pressure sensor, i.e., the pressure difference between the inlet tar pipeline and the outlet tar pipeline, is calculated by the control system; when the pressure difference reaches 0.06MPa, the first control valve on the inlet flushing pipeline and the second control valve on the outlet flushing pipeline are opened, and the inlet tar pipeline and the outlet tar pipeline are flushed with hot ammonia water; when the pressure difference drops to 0.02MPa, the first control valve and the second control valve are automatically closed to stop flushing;

[0015] 3) Use the bottom backwash pipe to clean the inside of the thick filter with hot ammonia water regularly every day to prevent the thick tar from clogging the thick filter; the temperature of the hot ammonia water is controlled at 70-80°C, the pressure is 0.4-0.6MPa, and the backwash time is not less than 10min;

[0016] 4) The tar and tar residue discharged from the tar outlet of the thick material filter enter the tar pressing pump through the outlet tar pipeline, the tar residue is crushed by the tar pressing pump, and then the tar containing the crushed tar residue is sent back to the tar residue pre-separator.

[0017] An internal baffle is arranged in the thick material filter; the internal baffle is placed in the initial working position at the initial stage of system operation, that is, it is arranged parallel to the direction of the line connecting the tar inlet and the tar outlet; after the system runs smoothly, the internal baffle is taken out and then rotated horizontally by 90° and then put back into the thick material filter. At this time, the internal baffle is placed in the normal working position, that is, it is arranged perpendicular to the direction of the line connecting the tar inlet and the tar outlet, so as to block a part of the large particles of tar residue and avoid clogging the subsequent pipelines and tar pressing pumps.

[0018] At the initial stage of system operation, an internal partition is installed in the thick material filter and is placed in the initial working position, that is, it is arranged parallel to the direction of the line connecting the tar inlet and the tar outlet; after the system runs smoothly, the internal partition is taken out, and the agitation device is installed in the thick material filter and started to prevent large pieces of tar residue from depositing at the bottom of the thick material filter.

[0019] When the ambient temperature in winter exceeds the set minimum value, steam is introduced into the imported tar pipeline through the steam pipeline for heating to increase the fluidity of tar and tar residue and avoid clogging of the thick material filter due to tar solidification.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The automatic flushing function of the thick material filter is added, and the thick material filter is cleaned regularly by using the control system to prevent sticky tar and tar residue from clogging the thick material filter;

[0022] 2) Add pressure measuring points on the tar inlet and outlet pipes of the thick material filter. If the pressure difference reaches the upper limit (such as 0.06MPa), the control system immediately starts the hot ammonia flushing. When the pressure difference returns to the lower limit (such as 0.02MPa), the hot ammonia flushing is automatically shut down by the control system.

[0023] 3) Add a timed backwashing function at the bottom of the thick filter to regularly clean the inside of the thick filter to prevent sticky tar from clogging the thick filter;

[0024] 4) The inlet tar pipeline of the thick material filter is equipped with steam heating function to improve the fluidity of tar and tar residue, and avoid clogging of the thick material filter due to tar solidification caused by low temperature in winter;

[0025] 5) The setting direction of the inner baffle of the thick material filter is consistent with the direction of the fluid at the beginning of operation. After the thick material filter runs normally and smoothly, the inner baffle is rotated horizontally by 90° to make it perpendicular to the direction of the fluid, which can block some large particles of tar residue and avoid clogging subsequent pipelines and tar pressing pumps.

[0026] 6) The inner partition of the thick material filter can be used only in the initial stage of operation. After normal and stable operation, the inner partition can be removed and a stirring device can be added to the thick material filter to prevent large pieces of tar residue from being deposited at the bottom of the thick material filter and clogging the thick material filter.

[0027] 7) It can effectively prevent tar residue from blocking the pipeline, improve the stability of the process system operation, and reduce the economic losses caused by production reduction or shutdown due to tar residue blockage.

[0028] 8) The system adopts a closed cycle with no leakage and no gas escape, which improves the environmental protection level and meets environmental protection requirements.

[0029] 9) Automatic control is achieved through the interlocking of control systems, pressure sensors and valves, which improves the degree of automation, reduces labor costs and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a system for preventing a thick material filter from being blocked during separation of tar residues according to the present invention.

[0031] Figure 2 The state diagram of the inner partition in the thick material filter of the present invention is shown in FIG. Figure 1 (The inner partition is in the initial working position).

[0032] Figure 3 The state diagram of the inner partition in the thick material filter of the present invention is shown in FIG. Figure 2 (Inner partition is in normal working position).

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the pounding device of the present invention.

[0034] In the figure: 1. Tar residue pre-separator 2. Thick material filter 2-1. Tar inlet 2-2. Tar outlet 3. Tar squeeze pump 4. Steam pipeline 5. Inlet tar pipeline 6. Inlet flushing pipeline 7. Outlet tar pipeline 8. Outlet flushing pipeline 9. Tar return pipeline 10. Venting pipeline 11. Bottom backwashing pipeline 12. First pressure sensor 13. Second pressure sensor 14. Inner partition 15. Stirring device 15-1. Bracket 15-2. Stirring motor 15-3. Stirring shaft 15-4. Stirring blade 15-5. Disturbance shaft 15-6. Disturbance blade 15-7. Connecting rod 15-8. Groove DETAILED DESCRIPTION

[0035] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0036] like Figure 1 As shown, the system for preventing the thick material filter from being blocked during the separation of tar residues of the present invention comprises a thick material filter 2 arranged between a tar residue pre-separator 1 and a tar pressing pump 3, wherein the thick material filter 2 is connected to the tar outlet at the bottom of the tar residue pre-separator 1 through an inlet tar pipeline 5, and is connected to the tar inlet of the tar pressing pump 3 through an outlet tar pipeline 7, and the outlet of the tar pressing pump 3 is connected to the return tar inlet at the top of the tar residue pre-separator 1 through a return tar pipeline 9; the solid outlet at the bottom of the thick material filter 2 is connected to the emptying tank through an emptying pipeline 10; the system for preventing the thick material filter from being blocked during the separation of tar residues also comprises an inlet flushing pipeline 6, an outlet flushing pipeline 8, a bottom backwashing pipeline 11, a first pressure sensor 12, a second pressure sensor 13 and a control system; the hot ammonia outlet of the inlet flushing pipeline 6 is connected to the inlet tar pipeline 5, and the inlet flushing pipeline 6 is provided with a first Control valve; the hot ammonia water outlet of the outlet flushing pipe 8 is connected to the outlet tar pipe 7, and a second control valve is arranged on the outlet flushing pipe 8; a first pressure sensor 12 is arranged on the inlet tar pipe 5 downstream of the inlet flushing pipe 6, and a second pressure sensor 13 is arranged on the outlet tar pipe 7 upstream of the outlet flushing pipe 8; the signal output ends of the first pressure sensor 12 and the second pressure sensor 13 are connected to the signal input end of the control system, and the signal output end of the control system is connected to the control ends of the first control valve and the second control valve; the hot ammonia water outlet of the bottom backwashing pipe 11 is connected to the venting pipe 10, a third control valve is arranged on the bottom backwashing pipe 11, a fourth control valve is arranged on the venting pipe 10 upstream of the bottom backwashing pipe 11, and a fifth control valve is arranged on the venting pipe 10 downstream of the bottom backwashing pipe 11; the third control valve, the fourth control valve and the fifth control valve are interlocked and controlled by the control system.

[0037] A steam inlet is provided on the inlet tar pipeline 5 upstream of the inlet flushing pipeline 6 and is connected to a steam source through a steam pipeline 4 .

[0038] The thick material filter 2 is composed of a filter body, a top cover plate, an inner partition plate 14 and a filter screen; the filter body includes an upper straight section cylinder and a lower conical section cylinder; a tar inlet 2-1 is provided on one side of the upper part of the filter body, and a tar outlet 2-2 is provided on the other side of the upper part opposite to the tar inlet 2-1; an inner partition plate 14 is provided in the straight section cylinder between the tar inlet 2-1 and the tar outlet 2-2; the top of the filter body is detachably connected to the top cover plate, and the top of the inner partition plate 14 is fixedly connected to the top cover plate; a filter screen is provided in the filter body below the inner partition plate 14; the inner partition plate 14 has an initial working position and a normal working position, and when the inner partition plate 14 is in the initial working position, it is parallel to the connecting line direction of the tar inlet 2-1 and the tar outlet 2-2 (such as Figure 2 When the inner partition plate 14 is in the normal working position, it is perpendicular to the connecting line of the tar inlet 2-1 and the tar outlet 2-2 (as shown in FIG. Figure 3 shown).

[0039] The system for preventing the thick material filter from being blocked during the separation of tar residues according to the present invention further comprises a stirring device 15; Figure 4 As shown, the pounding device 15 is composed of a bracket 15-1, a pounding motor 15-2, a stirring paddle and a disturbance mechanism; the thick material filter 2 is composed of a filter body, a top cover plate and a filter screen; the filter body includes a straight section cylinder at the top and a conical section cylinder at the bottom; a tar inlet 2-1 is provided on one side of the upper part of the filter body, and a tar outlet 2-2 is provided on the other side of the upper part opposite to the tar inlet 2-1; the top of the filter body is detachably connected to the top cover plate, and a filter screen is provided at the bottom of the filter body; the bracket 15-1 is provided on the top cover plate, the pounding motor 15-2 is installed on the bracket 15-2, and the stirring paddle is composed of a stirring shaft 15-3 and a stirring blade 15-4, the upper end of the stirring shaft 15-3 is connected to the motor shaft of the pounding motor 15-2, and the stirring shaft A plurality of stirring blades 15-4 are arranged at the lower end of 15-3; at least two groups of disturbance mechanisms are arranged, each group of disturbance mechanisms includes a disturbance shaft 15-5, a disturbance blade 15-6 and a connecting rod 15-7; the upper end of the disturbance shaft 15-5 is hinged to the upper part of the stirring shaft 15-3, and the lower end of the disturbance shaft 15-5 is arranged with a disturbance blade 15-6; a wavy groove 15-8 is arranged on the upper inner wall of the filter body along the circumferential direction, one end of the connecting rod 15-7 is connected to the disturbance shaft 15-5, and the other end of the connecting rod 15-7 is stuck in the groove 15-8; when the stirring shaft 15-3 rotates under the drive of the pounding motor 15-2, the disturbance shaft 15-5 rotates accordingly, and drives the disturbance blade 15-6 to disturb up and down in a wave-like manner along the circumference of the thick material filter 2 under the action of the connecting rod 15-7.

[0040] The method for preventing a thick material filter from being blocked during separation of tar residues according to the present invention comprises the following steps:

[0041] 1) The coke oven raw gas is cooled by circulating ammonia water in the gas collecting pipe to form a tar-ammonia water mixture containing tar, tar semi-solid, coal powder and semi-coke; the tar-ammonia water mixture and the coke oven raw gas enter the gas-liquid separator for gas-liquid separation; the separated tar-ammonia water mixture enters the tar residue pre-separator 1, and the solid matter larger than 8 mm is retained in the tar residue pre-separator 1, and the solid matter settles to the bottom of the tar residue pre-separator 1 and enters the thick matter filter 2 through the inlet tar pipeline 5;

[0042] 2) A first pressure sensor 12 is provided on the inlet tar pipeline 5, and a second pressure sensor 13 is provided on the outlet tar pipeline 7. The difference between the measured values ​​of the first pressure sensor 12 and the second pressure sensor 13, i.e., the pressure difference between the inlet tar pipeline 5 and the outlet tar pipeline 7, is calculated by the control system; when the pressure difference reaches 0.06MPa, the first control valve on the inlet flushing pipeline 6 and the second control valve on the outlet flushing pipeline 8 are opened, and the inlet tar pipeline 5 and the outlet tar pipeline 7 are flushed with hot ammonia water; when the pressure difference drops to 0.02MPa, the first control valve and the second control valve are automatically closed to stop flushing;

[0043] 3) Using the bottom backwash pipe 11, the inside of the thick filter 2 is cleaned with hot ammonia water on a regular basis every day to prevent the thick tar from clogging the thick filter 2; the temperature of the hot ammonia water is controlled at 70-80°C, the pressure is 0.4-0.6MPa, and the backwash time is not less than 10min;

[0044] 4) The tar and tar residue discharged from the tar outlet 2-2 of the thick material filter 2 enter the tar pressing pump 3 through the outlet tar pipeline 7, the tar residue is crushed by the tar pressing pump 3, and then the tar containing the crushed tar residue is sent back to the tar residue pre-separator 1.

[0045] As a preferred solution, an inner baffle 14 is provided in the thick material filter 2; the inner baffle 14 is placed in the initial working position at the initial stage of system operation, that is, it is arranged parallel to the direction of the line connecting the tar inlet 2-1 and the tar outlet 2-2; after the system runs smoothly, the inner baffle 14 is taken out and then horizontally rotated 90° and then put back into the thick material filter 2. At this time, the inner baffle 14 is placed in the normal working position, that is, it is arranged perpendicular to the direction of the line connecting the tar inlet 2-1 and the tar outlet 2-2, so as to block a part of the large particles of tar residue and avoid clogging the subsequent pipeline and the tar pressing pump 3.

[0046] As another preferred solution, at the initial stage of system operation, an inner baffle 14 is provided in the thick material filter 2, and the inner baffle 14 is placed in the initial working position, that is, it is arranged parallel to the direction of the line connecting the tar inlet 2-1 and the tar outlet 2-2; after the system runs smoothly, the inner baffle 14 is taken out, and the agitation device 15 is installed in the thick material filter 2 and started to prevent large pieces of tar residue from being deposited at the bottom of the thick material filter.

[0047] When the ambient temperature in winter exceeds the set minimum value, steam is introduced into the inlet tar pipeline 5 through the steam pipeline 4 for heating, thereby increasing the fluidity of the tar and tar residue and preventing the thick material filter 2 from being blocked due to tar solidification.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for preventing a thick material filter from being blocked during tar residue separation, comprising a thick material filter disposed between a tar residue pre-separator and a tar pressing pump, wherein the thick material filter is connected to a tar outlet at the bottom of the tar residue pre-separator through an inlet tar pipeline, and is connected to a tar inlet of a tar pressing pump through an outlet tar pipeline, and the outlet of the tar pressing pump is connected to a return tar inlet at the top of the tar residue pre-separator through a return tar pipeline; the solid matter outlet at the bottom of the thick material filter is connected to a venting tank through a venting pipeline; characterized in that The system for preventing the thick material filter from being blocked during the separation of tar residues also includes an inlet flushing pipeline, an outlet flushing pipeline, a bottom backwashing pipeline, a first pressure sensor, a second pressure sensor and a control system; the hot ammonia water outlet of the inlet flushing pipeline is connected to the inlet tar pipeline, and a first control valve is arranged on the inlet flushing pipeline; the hot ammonia water outlet of the outlet flushing pipeline is connected to the outlet tar pipeline, and a second control valve is arranged on the outlet flushing pipeline; a first pressure sensor is arranged on the inlet tar pipeline downstream of the inlet flushing pipeline, and a second pressure sensor is arranged on the outlet tar pipeline upstream of the outlet tar pipeline; the signal output ends of the first pressure sensor and the second pressure sensor are connected to the signal input end of the control system, and the signal output end of the control system is connected to the control ends of the first control valve and the second control valve; the hot ammonia water outlet of the bottom backwashing pipeline is connected to the venting pipeline, a third control valve is arranged on the bottom backwashing pipeline, a fourth control valve is arranged on the venting pipeline upstream of the bottom backwashing pipeline, and a fifth control valve is arranged on the venting pipeline downstream of the bottom backwashing pipeline; the third control valve, the fourth control valve and the fifth control valve are interlocked and controlled by the control system.

2. A system for preventing thick material filter from being blocked during separation of tar residue according to claim 1, characterized in that: A steam inlet is arranged on the imported tar pipeline upstream of the imported tar pipeline and is connected to a steam source through a steam pipeline.

3. A system for preventing thick material filter from being blocked during separation of tar residue according to claim 1, characterized in that: The thick material filter is composed of a filter body, a top cover plate, an inner baffle and a filter screen; the filter body includes an upper straight section cylinder and a lower conical section cylinder; a tar inlet is arranged on one side of the upper part of the filter body, and a tar outlet is arranged on the other side of the upper part opposite to the tar inlet; an inner baffle is arranged in the straight section cylinder between the tar inlet and the tar outlet; The top of the filter body is detachably connected to the top cover plate, and the top of the inner partition is fixedly connected to the top cover plate; a filter screen is arranged in the filter body below the inner partition plate; the inner partition plate has an initial working position and a normal working position, and when the inner partition plate is in the initial working position, it is parallel to the direction of the line connecting the tar inlet and the tar outlet, and when the inner partition plate is in the normal working position, it is perpendicular to the direction of the line connecting the tar inlet and the tar outlet.

4. A system for preventing a thick material filter from being blocked during separation of tar residue according to claim 1, characterized in that: It also includes a pounding device; the pounding device is composed of a bracket, a pounding motor, a stirring paddle and a disturbance mechanism; the thick material filter is composed of a filter body, a top cover plate and a filter screen; the filter body includes a straight section cylinder at the top and a conical section cylinder at the bottom; a tar inlet is arranged on one side of the upper part of the filter body, and a tar outlet is arranged on the other side of the upper part opposite to the tar inlet; the top of the filter body is detachably connected to the top cover plate, and a filter screen is arranged at the bottom of the filter body; the bracket is arranged on the top cover plate, the pounding motor is installed on the bracket, the stirring paddle is composed of a stirring shaft and stirring blades, and the stirring shaft The upper end is connected to the motor shaft of the pounding motor, and the lower end of the stirring shaft is provided with a plurality of stirring blades; at least two groups of disturbance mechanisms are provided, and each group of disturbance mechanisms includes a disturbance shaft, a disturbance blade and a connecting rod; the upper end of the disturbance shaft is hinged to the upper part of the stirring shaft, and the lower end of the disturbance shaft is provided with a disturbance blade; a wavy groove is provided along the circumferential direction of the upper inner wall of the filter body, one end of the connecting rod is connected to the disturbance shaft, and the other end of the connecting rod is stuck in the groove; when the stirring shaft rotates under the drive of the pounding motor, the disturbance shaft rotates accordingly, and under the action of the connecting rod, the disturbance blade is driven to disturb up and down in a wave-like manner along the circumference of the thick material filter.

5. A method for preventing a thick filter from being blocked during separation of tar residue, which is implemented based on the system for preventing a thick filter from being blocked during separation of tar residue as claimed in any one of claims 1 to 4, characterized in that: The process includes the following: 1) The coke oven raw gas is cooled by circulating ammonia water in the gas collecting pipe to form a tar-ammonia water mixture containing tar, tar semi-solid, coal powder and semi-coke; the tar-ammonia water mixture and the coke oven raw gas enter the gas-liquid separator for gas-liquid separation; the separated tar-ammonia water mixture enters the tar residue pre-separator, and the solid matter larger than 8mm is retained in the tar residue pre-separator, and the solid matter settles to the bottom of the tar residue pre-separator and enters the thick matter filter through the inlet tar pipeline; 2) A first pressure sensor is provided on the inlet tar pipeline, and a second pressure sensor is provided on the outlet tar pipeline. The difference between the measured values ​​of the first pressure sensor and the second pressure sensor, i.e., the pressure difference between the inlet tar pipeline and the outlet tar pipeline, is calculated by the control system; when the pressure difference reaches 0.06MPa, the first control valve on the inlet flushing pipeline and the second control valve on the outlet flushing pipeline are opened, and the inlet tar pipeline and the outlet tar pipeline are flushed with hot ammonia water; when the pressure difference drops to 0.02MPa, the first control valve and the second control valve are automatically closed to stop flushing; 3) Use the bottom backwash pipe to clean the inside of the thick filter with hot ammonia water regularly every day to prevent the thick tar from clogging the thick filter; the temperature of the hot ammonia water is controlled at 70-80°C, the pressure is 0.4-0.6MPa, and the backwash time is not less than 10min; 4) The tar and tar residue discharged from the tar outlet of the thick material filter enter the tar pressing pump through the outlet tar pipeline, the tar residue is crushed by the tar pressing pump, and then the tar containing the crushed tar residue is sent back to the tar residue pre-separator.

6. A method for preventing a thick material filter from being blocked during separation of tar residue according to claim 5, characterized in that: An internal baffle is arranged in the thick material filter; the internal baffle is placed in the initial working position at the initial stage of system operation, that is, it is arranged parallel to the direction of the line connecting the tar inlet and the tar outlet; after the system runs smoothly, the internal baffle is taken out and then rotated horizontally by 90° and then put back into the thick material filter. At this time, the internal baffle is placed in the normal working position, that is, it is arranged perpendicular to the direction of the line connecting the tar inlet and the tar outlet, so as to block a part of the large particles of tar residue and avoid clogging the subsequent pipelines and tar pressing pumps.

7. A method for preventing a thick material filter from being blocked during separation of tar residue according to claim 5, characterized in that: At the initial stage of system operation, an internal partition is installed in the thick material filter and is placed in the initial working position, that is, it is arranged parallel to the direction of the line connecting the tar inlet and the tar outlet; after the system runs smoothly, the internal partition is taken out, and the agitation device is installed in the thick material filter and started to prevent large pieces of tar residue from depositing at the bottom of the thick material filter.

8. A method for preventing a thick material filter from being blocked during separation of tar residue according to claim 5, characterized in that: When the ambient temperature in winter exceeds the set minimum value, steam is introduced into the imported tar pipeline through the steam pipeline for heating to increase the fluidity of tar and tar residue and avoid clogging of the thick material filter due to tar solidification.

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