Economical and environment-friendly tar residue separation system and method thereof

Abstract

The invention belongs to the technical field of energy conservation and environmental protection in the coking industry, and particularly relates to an energy-saving and environment-friendly tar residue separation system and a method thereof. The energy-saving and environment-friendly tar residue separation system comprises a gas-liquid separator, a tar residue pre-separator and a tar and ammonia water separation tank, an outlet of the tar residue pre-separator is connected with an inlet of a tar and ammonia water separation tank through a pipeline, and a bottom outlet of the tar and ammonia water separation tank is pumped to a tar centrifugal machine through a tar middle pump. And a rotary-cut crusher and an open impeller centrifugal pump are sequentially arranged on the circulating crushing pipeline in the material flow direction. The device has the beneficial effects that a tar squeezing pump is canceled and replaced by the rotary-cut crusher and the open impeller centrifugal pump, so that the equipment investment is saved, the operation cost of an enterprise is reduced, and meanwhile, the problems that the tar squeezing pump is high in failure rate and difficult to maintain are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of energy conservation and environmental protection in the coking industry, and in particular relates to an energy-saving and environmentally friendly tar residue separation system and method. Background Art

[0002] During the coking process, the high-temperature coke oven gas generated is cooled by ammonia water circulating in the gas collecting pipe, and some high-boiling-point organic compounds are condensed from gas into semi-solid tar. At the same time, coal powder, semi-coke, etc. entrained in the gas are mixed in the tar to form a tar-ammonia mixed liquid, which enters the gas-liquid separator together with the coke oven raw gas from the coke oven. The separated tar-ammonia mixed liquid enters the tar residue pre-separator, and the tar residue and the mixed liquid are separated by gravity.

[0003] 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 squeeze pump for squeezing, but the oil residue squeeze 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. This solution has simple equipment and low maintenance cost, and does not require the use of an oil residue squeeze pump to treat tar residue, thereby reducing the cost of enterprises to treat tar residue. The disadvantage is that the equipment occupies a large space.

[0004] The Chinese utility model patent with application number 202220786498.9 discloses a harmless full treatment system for tar residue in residual ammonia water, which includes: a mechanized clarification tank, a liquefaction tank, and a separation device; the mechanized clarification tank is used to separate the tar residue in the residual ammonia water; the liquefaction tank is used to liquefy the tar residue; the separation device is used to separate the fluid tar residue; the liquefaction tank is arranged below the mechanized clarification tank, and the slag outlet of the mechanized clarification tank can directly discharge the tar residue into the liquefaction tank; the liquefaction tank and the separation device are connected by a pipeline. A grinding device is also provided between the liquefaction tank and the separation device, and the grinding device is used to crush the liquefied tar residue output from the liquefaction tank. The grinding device is selected from a pipeline grinding pump, a spiral grinder or an extrusion grinder. The disadvantage of this scheme is that due to the volatility of coking production, the front-end pipeline of the grinding device is still likely to be blocked, and further optimization is needed. Summary of the invention

[0005] The purpose of the present invention is to provide an economical and environmentally friendly tar residue separation system and method thereof, which overcomes the shortcomings of the prior art. The present invention eliminates the tar squeezing pump and uses a rotary cutter crusher instead. After crushing, the tar residue less than 3 mm can directly enter the ordinary open impeller centrifugal pump, and the tar residue is sent back to the upper part of the pre-separator, saving investment, improving the quality of tar, solving the problems of pipeline and subsequent tar intermediate pump blockage, and stabilizing production.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] One of the technical solutions: an economical and environmentally friendly tar residue separation system, comprising a gas-liquid separator, a tar residue pre-separator and a tar-ammonia water separation tank, the bottom flow of the gas-liquid separator is connected to the feed port of the tar residue pre-separator through a pipeline, a grate screen is provided at the outlet of the tar residue pre-separator, the outlet of the tar residue pre-separator is connected to the inlet of the tar-ammonia water separation tank through a pipeline, the bottom outlet of the tar-ammonia water separation tank is pumped to a tar centrifuge via a tar intermediate pump, characterized in that a circulating crushing pipeline is provided between the bottom flow and the return port of the tar residue pre-separator, the return port is located at the upper edge of the tar residue pre-separator, and a rotary cutter crusher and an open impeller centrifugal pump are provided in sequence along the material flow direction on the upper edge of the circulating crushing pipeline.

[0008] The structure of the rotary cutter crusher includes a fully enclosed casing, a motor, a screen plate and a cutter head. The screen plate is arranged at a 45° angle in the fully enclosed casing. The cutter head is arranged on a cutter shaft. One end of the cutter shaft is movably connected to the screen plate, and the other end is connected to the output shaft of the motor. A sealed bearing is arranged between the cutter shaft and the fully enclosed casing.

[0009] The sieve plate is a bar-shaped sieve plate or a hole-shaped sieve plate. The sieve plate is provided with three layers in total, and the gap or aperture of the third layer of sieve plates is 2.8-3.0 mm.

[0010] The cutter head is made of wear-resistant alloy steel, and three layers of blades are arranged on the cutter head. Each layer is evenly provided with 2-4 blades around the circumference, and the number of blade layers is consistent with the number of sieve plate layers.

[0011] The circulating crushing pipeline is provided with a branch line connected to the tar centrifuge.

[0012] The rotary cutter is directly connected to the outlet of the tar residue pre-separator without passing through a pipeline.

[0013] A tamping device is provided at the feed inlet of the tar residue pre-separator. The tamping device is connected and fixed to the upper edge of the tar residue pre-separator through a flange. The upper cover of the tamping device is provided with a feed inlet, and the bottom thereof is provided with a discharge port.

[0014] The tamping device structure includes a motor, an upper cover, a milling seat, a milling wheel and a spherical screen plate. The spherical screen plate is arranged in the milling seat. The upper end of the milling wheel is connected to the motor output shaft through hinge shaft 1, and the lower end of the milling wheel is connected to the center of the spherical screen plate through hinge shaft 2.

[0015] Technical solution 2: An economical and environmentally friendly tar residue separation method, characterized in that a circulating crushing pipeline is provided between the bottom flow and the return port of the tar residue pre-separator, so that large pieces of tar residue with a particle size greater than 3 mm deposited at the bottom of the tar residue pre-separator are crushed and returned to the tar residue pre-separator, thereby improving the separation efficiency of the tar residue pre-separator.

[0016] A tamping and crushing operation is first performed at the feed port of the tar residue pre-separator to reduce the amount of large tar residues with a particle size greater than 3 mm entering the tar residue pre-separator.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) Optimize equipment configuration: The tar press pump was cancelled and replaced with a rotary crusher and an open impeller centrifugal pump. This not only saves equipment investment and reduces the company's operating costs, but also solves the problem of high failure rate and difficult maintenance of the tar press pump;

[0019] 2) Improve production efficiency: The present invention uses a rotary crusher to effectively crush large particles of tar residue to a particle size of less than 3 mm, thereby avoiding tar residue clogging the pipeline, improving the stability of process operation, and reducing the economic losses caused by production reduction or shutdown due to tar residue clogging.

[0020] 3) Improve environmental protection level: The rotary cutter crusher has a fully enclosed structure with no leakage and no gas escape, which improves the environmental protection level and meets the current social requirements for environmental protection.

[0021] 4) Improve tar quality: The present invention reduces the particle size of tar residue, improves the tar quality, solves the problem of pipeline and subsequent tar intermediate pump blockage, and ensures safe and stable production.

[0022] 5) Simplified operation: The present invention eliminates the need to clean the tar pressing pump that is often blocked, and uses a common open impeller centrifugal pump, which simplifies the operation and reduces the workload of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a process flow chart of an embodiment of the present invention;

[0024] Figure 2 2 is a schematic diagram of the structure of a rotary cutter crusher according to an embodiment of the present invention;

[0025] Figure 3Schematic diagram of the cutter head and screen plate structure of the rotary cutter crusher in an embodiment of the present invention;

[0026] Figure 4 2 is a schematic diagram of the structure of a tamping device in an embodiment of the present invention;

[0027] In the figure: 1-gas-liquid separator, 2-tar residue pre-separator, 3-rotary crusher, 4-open impeller centrifugal pump, 5-tar ammonia water separation tank, 6-tar intermediate pump, 7-coarse tar ammonia water pipe, 8-circulating crushing pipeline, 9-grate screen, 10-return port, 11-fine tar ammonia water pipe, 12-fully enclosed shell, 13-crushing motor, 14-sieve plate, 15-cutter head, 16-cutter shaft, 17-sealed bearing, 18-blade, 19-tamping device, 20-flange, 21-tamping motor, 22-upper cover, 23-milling seat, 24-milling wheel, 25-spherical sieve plate, 26-hinge shaft one, 27-hinge shaft two, 28-tar centrifuge. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0030] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the invention claimed, but merely represents selected embodiments of the present invention.

[0031] See Figure 1-4, is a schematic structural diagram of an embodiment of an energy-saving and environment-friendly pre-separator post-tar residue treatment system of the present invention, comprising a gas-liquid separator 1, a tar residue pre-separator 2 and a tar-ammonia water separation tank 5, the bottom flow of the gas-liquid separator 1 is connected to the feed port of the tar residue pre-separator 2 through a thick tar-ammonia water pipe 7, a grate screen 9 is provided at the outlet of the tar residue pre-separator 2, the outlet of the tar residue pre-separator 2 is connected to the inlet of the tar-ammonia water separation tank 5 through a thin tar-ammonia water pipe 11, the bottom outlet of the tar-ammonia water separation tank 5 is sent to a tar centrifuge 28 through a tar intermediate pump 6, a circulating crushing pipeline 8 is provided between the bottom flow and the return port of the tar residue pre-separator 2, the return port 10 is located at the upper edge of the tar residue pre-separator 2, and a rotary cutter crusher 3 and an open impeller centrifugal pump 4 are provided in sequence along the material flow direction of the circulating crushing pipeline 8. In order to reduce the blockage of the tar residue in the pipeline, the rotary crusher 3 can be directly connected to the outlet of the tar residue pre-separator 2 without passing through a pipeline.

[0032] The structure of the rotary crusher 3 includes a fully enclosed housing 12, a crushing motor 13, a sieve plate 14 and a cutter head 15. The sieve plate 14 is arranged at a 45° angle in the fully enclosed housing 12. The cutter head 15 is arranged on a cutter shaft 16. One end of the cutter shaft 16 is movably connected to the sieve plate 14, and the other end is connected to the output shaft of the crushing motor 13. A sealed bearing 17 is provided between the cutter shaft 16 and the fully enclosed housing 12.

[0033] The cutter head 15 is made of wear-resistant alloy steel, and there are three layers of blades arranged on the cutter head. Each layer is evenly provided with four blades 18 in the circumferential direction, and the number of blade layers is consistent with the number of sieve plate layers. The rotary cutter 3 uses rotating blades to cut and crush the tar residue. The cutter head 15 is driven to rotate by the crushing motor 13. When the tar residue is sent into the crushing chamber, the blade will strongly cut and impact the material, thereby crushing the tar residue into tar residue no larger than 3mm. The blades of the rotary cutter 3 are made of brand-new wear-resistant alloy steel, which prolongs the service life of the rotary cutter and reduces the number of maintenance.

[0034] The sieve plate 14 used in the rotary crusher 3 is a hole-shaped sieve plate. The sieve plate has three layers. The aperture of the third layer of the sieve plate is 2.8-3.0 mm, which is used to control the particle size of the tar residue. The tar residue larger than 3 mm is retained in the equipment for further crushing, and the tar residue less than or equal to 3 mm is discharged through the sieve plate 14.

[0035] In order to further reduce the blockage of tar residue in the pipeline, a tamping device 19 can be provided at the feed port of the tar residue pre-separator 2. The tamping device 19 is connected and fixed to the upper edge of the tar residue pre-separator 2 through a flange 20. The upper cover of the tamping device 19 is provided with a feed port, and the bottom thereof is provided with a discharge port. The tamping device structure includes a tamping motor 21, an upper cover 22, a rolling seat 23, a rolling wheel 24 and a spherical screen plate 25. The spherical screen plate 25 is arranged in the rolling seat 23. The upper end of the rolling wheel 24 is connected to the output shaft of the tamping motor 21 through a hinge shaft 1 26, and the lower end of the rolling wheel 24 is movably connected to the center of the spherical screen plate 25 through a hinge shaft 27.

[0036] The present invention provides an environmentally friendly tar residue separation method in which a circulating crushing pipeline 8 is provided between the bottom flow and the return port of the tar residue pre-separator 2, so that the large pieces of tar residue with a particle size greater than 3 mm deposited at the bottom of the tar residue pre-separator 2 are crushed and returned to the tar residue pre-separator 2, thereby improving the separation efficiency of the tar residue pre-separator 2. In order to further improve the separation efficiency, a tamping crushing can be performed at the feed port of the tar residue pre-separator 2 to reduce the number of large pieces of tar residue with a particle size greater than 3 mm entering the tar residue pre-separator 2.

[0037] The raw gas from the coke oven enters the gas-liquid separator 1, and the separated tar-ammonia mixed liquid enters the tar residue pre-separator 2 through the coarse tar-ammonia pipe 7, where the tar-ammonia and tar residue are separated. The separated tar-ammonia enters the tar-ammonia separation tank 5 through the fine tar-ammonia pipe 11, and the ammonia and tar are separated in the tar-ammonia separation tank 5 by using the specific gravity difference. The separated tar is sent to the tar centrifuge 28 through the tar intermediate pump 6. A grate screen 9 is provided at the outlet of the tar-ammonia separated by the tar residue pre-separator 2. Solids larger than 3 mm will remain in the tar residue pre-separator 2 and settle to the conical bottom of the tar residue pre-separator. Large-particle tar residue enters the rotary cutter 3, and the large-particle tar residue is ground to a particle size of no more than 3 mm. The tar residue can directly enter the open impeller centrifugal pump 4 and be sent back to the upper part of the tar residue pre-separator 2 for circulation.

[0038] The present invention eliminates the tar squeezing pump and uses a rotary cutter instead. After crushing, the tar residue less than 3 mm can directly enter the open impeller centrifugal pump, and the tar residue is returned to the upper part of the tar residue pre-separator 2, which saves investment, can significantly improve the tar quality, solve the problems of pipeline and subsequent tar intermediate pump blockage, and ensure safe and stable production. According to process requirements, the circulating crushing pipeline 8 can also be provided with a branch to connect the tar centrifuge 28.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly tar residue separation system, comprising a gas-liquid separator, a tar residue pre-separator and a tar-ammonia separation tank, wherein the bottom flow of the gas-liquid separator is connected to the feed port of the tar residue pre-separator through a pipeline, a grate screen is provided at the outlet of the tar residue pre-separator, the outlet of the tar residue pre-separator is connected to the inlet of the tar-ammonia separation tank through a pipeline, and the bottom outlet of the tar-ammonia separation tank is pumped to the tar centrifuge through the tar intermediate pump, characterized in that: A circulating crushing pipeline is provided between the bottom flow and the return port of the tar residue pre-separator. The return port is located at the upper edge of the tar residue pre-separator. A rotary cutter crusher and an open impeller centrifugal pump are provided in sequence along the material flow direction of the circulating crushing pipeline.

2. The energy-saving and environment-friendly tar residue separation system according to claim 1 is characterized in that: The structure of the rotary cutter crusher includes a fully enclosed casing, a motor, a screen plate and a cutter head. The screen plate is arranged at a 45° angle in the fully enclosed casing. The cutter head is arranged on a cutter shaft. One end of the cutter shaft is movably connected to the screen plate, and the other end is connected to the output shaft of the motor. A sealed bearing is arranged between the cutter shaft and the fully enclosed casing.

3. The environmentally friendly tar residue separation system according to claim 2 is characterized in that: The sieve plate is a bar-shaped sieve plate or a hole-shaped sieve plate. The sieve plate is provided with three layers in total, and the gap or aperture of the third layer of sieve plates is 2.8-3.0 mm.

4. The energy-saving and environment-friendly tar residue separation system according to claim 2 is characterized in that: The cutter head is made of wear-resistant alloy steel, and three layers of blades are arranged on the cutter head. Each layer is evenly provided with 2-4 blades around the circumference, and the number of blade layers is consistent with the number of sieve plate layers.

5. The energy-saving and environment-friendly tar residue separation system according to claim 1 is characterized in that: The circulating crushing pipeline is provided with a branch line connected to the tar centrifuge.

6. The energy-saving and environment-friendly tar residue separation system according to claim 1, characterized in that: The rotary cutter is directly connected to the outlet of the tar residue pre-separator without passing through a pipeline.

7. The energy-saving and environment-friendly tar residue separation system according to claim 1, characterized in that: A tamping device is provided at the feed inlet of the tar residue pre-separator. The tamping device is connected and fixed to the upper edge of the tar residue pre-separator through a flange. The upper cover of the tamping device is provided with a feed inlet, and the bottom thereof is provided with a discharge port.

8. The energy-saving and environment-friendly tar residue separation system according to claim 7, characterized in that: The tamping device structure includes a motor, an upper cover, a milling seat, a milling wheel and a spherical screen plate. The spherical screen plate is arranged in the milling seat. The upper end of the milling wheel is connected to the motor output shaft through hinge shaft 1, and the lower end of the milling wheel is connected to the center of the spherical screen plate through hinge shaft 2.

9. A method for separating tar residues in an environmentally friendly manner, characterized in that: A circulating crushing pipeline is provided between the bottom flow and the return port of the tar residue pre-separator, so that the large tar residue with a particle size greater than 3mm deposited at the bottom of the tar residue pre-separator can be crushed and returned to the tar residue pre-separator, thereby improving the separation efficiency of the tar residue pre-separator.

10. The method for separating tar residue according to claim 9, characterized in that: A tamping and crushing operation is first performed at the feed inlet of the tar residue pre-separator to reduce the amount of large tar residues with a particle size greater than 3 mm entering the tar residue pre-separator.

Images